CN101046271A - Vacuum insulating material, hot water supplying device using the same and electric drive type hot water device - Google Patents

Abstract

The present invention provides a vacuum heat insulating material capable of maintaining high heat insulating performance even in a high temperature environment, and provides a hot water supply device having high heat insulating performance. Equipped with a core material (51) made of inorganic fiber polymer, an outer cover material (52) with a surface protection layer, an airtight layer and a heat-welded layer, and the moisture content of the core material (51) and the outer cover material (52) In the vacuum heat insulation material of the adsorbent (53) adsorbing the gas component, the airtight layer passing through the outer packaging material (52) is the first airtight layer and the second airtight layer with at least two metal layers facing each other. It is laminated by way of lamination, and a resin film with a melting point above 150°C is used as a heat-welding layer, so that the heat insulation performance can be maintained for a long time even in a high temperature environment.

Description

Vacuum heat insulating material, hot water supply equipment using same, and electric hot water equipment

technical field

The present invention relates to a vacuum heat insulating material, a hot water supply device using the vacuum heat insulating material, and an electric hot water device.

Background technique

In recent years, from the viewpoint of global warming, the need to reduce power consumption has been demanded in household electrical appliances. For example, a refrigerator is a product that consumes electricity among home appliances, and reducing the electricity consumption of the refrigerator has become an indispensable situation as a countermeasure against global warming. Under such circumstances, refrigerators employing vacuum insulation materials have been commercialized to suppress unnecessary heat exchange with the outside and remarkably improve heat insulation efficiency.

As the main application fields of existing vacuum insulation materials, refrigerators are the first, and products with lower temperature ranges such as ultra-low temperature freezers, transport refrigerators, and refrigerated containers have become the center. However, since vacuum insulation materials have good thermal insulation properties, they have recently been studied for use in products with high temperature ranges such as bathtubs and vending machines.

Since it is applied to such a high-temperature product field, it is required that the material constituting the vacuum insulation material can sufficiently withstand this temperature range. The heat-resistant temperature of the wrapping material used for the vacuum heat insulating material is also an example, and as conventional examples, there are Patent Document 1 (JP-A-11-309069) and Patent Document 2 (JP-A-2001-8828) The product.

The vacuum heat insulating material shown in Patent Document 1 is an example of using a vacuum heat insulating material in an electric water heater, but the laminated film of the vacuum heat insulating material that is vacuum-sealed between the heat-resistant laminated films that arrange the core material is formed by sealing The inner layer, the airtight layer, and the protective layer are composed of a laminated film that is folded so that the heat-sealed portion becomes the outer side of the electric water heater. Since the temperature of electric water heaters rises to 100°C, there has been a problem that organic heat insulating materials such as urethane deteriorate and the heat insulating properties become very poor. In order to solve these problems, the vacuum heat insulating material of Patent Document 1 uses non-stretched polypropylene for the sealing layer in the covering material having the above-mentioned structure. By using this material, it has heat resistance, and it becomes a structure which makes a heat-sealed part close to the water heater outside, and suppresses deterioration of a heat-sealed part.

In addition, the example of the electric water heater shown in Patent Document 2 is an example in which a vacuum heat insulating material is provided on the outer periphery of the water storage container and the heat preservation power is very small. This is because in the airtight layer of the laminated film that constitutes the vacuum heat insulating material, metal foil is used on the higher temperature side and a vapor-deposited layer is used on the lower temperature side, so the high temperature side can be airtight at a temperature of 100°C It maintains a vacuum state well and maintains heat insulation for a long time. In addition, by using a vapor-deposited layer on the low-temperature side, the heat transferred and flowed into the metal foil is suppressed, and the performance of the entire vacuum insulation material is improved, thereby reducing power consumption.

The vacuum heat insulating material disclosed in Patent Document 1 uses aluminum foil and non-stretched polypropylene to improve airtightness and heat resistance, but small holes can be seen in thin aluminum foils such as 6 μm, so it can be understood that this The resulting deterioration of the airtightness. In addition, there is no specific solution to the deterioration of the airtightness caused by the use of non-stretched polypropylene, and it is a problematic configuration in terms of reliability.

In addition, although the vacuum heat insulating material shown in Patent Document 2 uses a metal foil layer on the high-temperature side and a vapor-deposited layer on the low-temperature side, the heat (thermal bridge) transferred and flowed in the vapor-deposited layer is suppressed, but the vapor-deposited layer Compared with metal foil, the airtightness is poor, so the amount of gas intrusion from the vapor deposition layer on the low temperature side becomes large. That is, there is a problem in terms of reliability.

In addition, as a new problem of use in a high-temperature environment, there is the influence of organic gases generated from the laminated film. According to the experiments of the inventors, it has been confirmed that the film laminated with a two-component hardening type urethane-based adhesive has solvents such as methanol, ethyl acetate, toluene, and styrene each time the temperature rises to 80°C. Gas escapes. In this way, there occurs a phenomenon in which components are detached from organic gas components such as components generated by decomposition. When there is a material with high airtightness such as aluminum foil, the gas generated on the inner layer side hardly penetrates the outer layer side, so it permeates into the thermally welded layer on the inner layer side. In low-temperature environments such as refrigerators, moisture and gas absorbents that have been commonly used cannot absorb these organic solvent-based gases, so the vacuum degree of vacuum insulation materials cannot be maintained. Therefore, as a result, the deterioration of the thermal insulation performance will be caused.

Regarding the adsorbent, there is no description in Patent Documents 1 and 2, and these problems are not considered.

An example of a conventional vacuum heat insulating material will be described below with reference to FIGS. 9 and 10 .

Fig. 9 is a cross-sectional view of a vacuum heat insulating material arrangement portion of a product using a vacuum heat insulating material, in which the temperature difference is expressed as "high temperature side" and "low temperature side" for convenience. 10 and 11 respectively show an example of a structural cross-section of the thin film 12a disposed on the high-temperature side and a structural cross-section of the thin film 12b disposed on the low-temperature side.

As shown in Fig. 9, generally, a vacuum heat insulating material 10 is composed of a core material 11 and an outer covering material 12, and is pasted on the wall material 20 on the high temperature side with an adhesive (not shown) or the like, and interposed between a space 25 and The wall material 21 on the low temperature side constitutes a heat insulating portion. In addition, an adsorbent is used to maintain the internal vacuum. Space 25 is also present in the case of rigid urethane foam and other insulating materials.

Among them, the structure of the film arranged on the high temperature side of the outer covering material 12 is composed of a surface protection layer 14, airtight layers 15 and 16, and a heat-welded layer 17 as shown in FIG. Aluminum foil is often used on the airtight layer 16 without deteriorating the performance.

In addition, as the structure of the film arranged on the low temperature side of the outer cover material 12, except for the case where a resin film is deposited on a base material to form an airtight layer 18 as shown in FIG. Same structure on one side.

On the high temperature side, the effect of small holes in the aluminum foil is taken into consideration. On the low temperature side, the vapor-deposited aluminum layer has poor airtightness compared to the original aluminum foil, and the airtightness tends to decrease even in any structure. In addition, organic gas components are generated from the adhesive, solvent, and the like from the lamination portion of the cover material 12 due to the influence of the high temperature side, but these are not considered.

Contents of the invention

The present invention was developed in view of such problems, and an object of the present invention is to provide a vacuum heat insulating material capable of maintaining high heat insulating performance even in a high temperature environment, and to provide a hot water supply device having high heat insulating performance.

Therefore, the present invention will solve the problems of such existing structures and new problems occurring at high temperature by using a vacuum insulation material characterized by having a core material composed of at least an inorganic fiber polymer, having a surface protection layer, the outer covering material of the airtight layer and the heat-welded layer, and the adsorbent for adsorbing the moisture and gas components of the above-mentioned core material and the above-mentioned outer covering material, wherein the inner covering material of the above-mentioned outer covering material is made of at least two metal layers Laminate face to face, and laminate a resin film with a melting point of 150°C or higher as a heat-welded layer, and compensate the cause of airtightness deterioration caused by small holes in each other through the metal layer that constitutes the airtight layer of the outer covering material The high melting point of the structure and heat-welded layer can be used at a high temperature of 110°C, and can greatly improve the use temperature range and airtightness.

Furthermore, since the present invention is a vacuum heat insulating material comprising a core material composed of at least an inorganic fiber polymer, an outer covering material having a surface protection layer, an airtight layer, and a heat-welded layer, and a combination of the core material and the above-mentioned A vacuum heat insulating material of an adsorbent that adsorbs moisture and gas components of the outer material and the inner material, wherein the airtight layer of the outer material has first and second metal parts that sandwich an adhesive layer and have at least two metal parts. In the airtight layer, the above-mentioned first airtight layer is made of a film with a metal film formed on one side of the resin film base material, and the above-mentioned second airtight layer is a metal foil or a metal film formed on one side of the resin film base material. Coating airtight resin film on the metal film, and resin film layer/metal film/adhesive layer/metal foil, resin film layer/metal film/airtight resin coating/adhesive layer/ The combination of metal film/resin film layer is laminated, so a resin film with a melting point of 150°C or higher is used as a heat-welded layer on the innermost layer to become the innermost layer, and the outer layer that becomes the innermost layer A resin film with a higher melting point than the above-mentioned heat-welded layer is used as a surface protection layer and the laminated product is used as an outer covering material, and the above-mentioned core material does not contain an adhesive and has recovery properties in the thickness direction. The above-mentioned adsorbent contains The openings of the receiving parts are overlapped and narrowed in the receiving parts cut obliquely with respect to the surface of the core material or in the thickness direction, so that the ingress of air and moisture from the outside can be prevented.

In addition, by using at least a hydrophobic adsorbent as the above-mentioned adsorbent, organic gas can be adsorbed even in a high-temperature environment, thereby suppressing deterioration of thermal insulation performance and maintaining vacuum over a long period of time.

In addition, according to the present invention, in the vacuum heat insulating material having any of the above-mentioned structures, the outer covering material is composed of first and second airtight layers, and a polyamide resin film (PA) is used as the first airtight layer. , ethylene-vinyl alcohol polymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET) any resin film as the substrate, and on one side For products made of any metal of aluminum (AL) or stainless steel (SUS), any metal of aluminum foil (AL), stainless steel foil (SUS), or iron foil (Fe) is used as the above-mentioned second airtight layer Foil using a laminated film laminated such that the metal layers of the first and second airtight layers face each other, and using a non-stretched polypropylene resin film (CPP) and a polybutylene terephthalate resin film (PBT) is used as the thermal welding layer, and the surface protection layer is a multi-layer laminated structure of a resin film with a higher melting point than the thermal welding layer, so that the metal film directly closes the unique small hole of the metal foil. structure, so the airtightness is high, and the entry of gas and moisture from the outside can be suppressed.

In addition, according to the present invention, in the vacuum heat insulating material having any of the above-mentioned structures, the outer covering material is composed of first and second airtight layers, and a polyamide resin film (PA) is used as the first airtight layer. , ethylene-vinyl alcohol polymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET) any resin film as the substrate, and on one side For products made of any metal of aluminum (AL) or stainless steel (SUS), any metal of aluminum foil (AL), stainless steel foil (SUS), or iron foil (Fe) is used as the above-mentioned second airtight layer Foil using a laminated film laminated such that the metal layers of the first and second airtight layers face each other, and using a non-stretched polypropylene resin film (CPP) and a polybutylene terephthalate resin film (PBT) is used as the thermal welding layer, and the surface protection layer is a multi-layer laminated structure of a resin film with a higher melting point than the thermal welding layer, which can reduce the thermal bridge of the outer material and improve the resin The airtightness produced by the structure sandwiching the coating with two metal films can balance high performance and long-term reliability.

In addition, in the present invention, in the vacuum heat insulating material having any of the above-mentioned structures, by using, as the above-mentioned hydrophobic adsorbent, a SiO ₂ /Al ₂ O ₃ ratio of 20 or more and non-combustible high-silica zeolite, It preferentially adsorbs toluene, methanol and other organic solvent gases with small molecular diameter and low boiling point.

In addition, the hot water supply facility of the present invention is characterized in that any one of the above-mentioned vacuum heat insulating materials is placed along an arc of the outer circumference of the above-mentioned hot water storage tank in a hot water supply facility such as an electric type or a heat pump type that includes at least a hot water storage tank. Arranged in a curved shape, and the heat insulation at the above-mentioned arc end is arranged at least twice, so that the heat leakage can be reduced by arranging the vacuum heat insulation material with improved heat resistance and airtightness without gaps, and it can be maintained for a long time insulation performance.

Furthermore, in the electric water heating equipment of the present invention having at least a hot water function and a heat preservation function, and comprising an outer contour container, a water storage container, and a cover, it is characterized in that any of the above-mentioned vacuum heat insulating materials is placed along the The outer circumference of the water storage container is curved, and the end portions of the vacuum heat insulating material in the curved direction are arranged in double, thereby reducing heat leakage from the water storage container.

According to the present invention, it is possible to provide a vacuum heat insulating material capable of maintaining high heat insulating performance even in a high temperature environment. In addition, since a vacuum insulation material can be used even in a high-temperature environment, it is possible to provide a hot water supply device with high thermal insulation performance.

Description of drawings

Fig. 1 is a sectional view of a vacuum heat insulating material.

Fig. 2 is an enlarged explanatory view of a wrapping material film.

Fig. 3 is an enlarged explanatory view of a wrapping material film.

Fig. 4 is a cross-sectional view showing a vacuum heat insulating material for measuring thermal conductivity.

Fig. 5 is an explanatory diagram of a hot water storage tank portion of the heat pump hot water supply machine provided with a vacuum heat insulating material.

Fig. 6 is a cross-sectional view along line A-A of Fig. 5 .

Fig. 7 is an explanatory diagram of an electric kettle provided with a vacuum heat insulating material.

Fig. 8 is a B-B sectional view of Fig. 7 .

Fig. 9 is a cross-sectional view of a vacuum heat insulating material placement portion of a conventional vacuum heat insulating material application product.

Fig. 10 is a cross-sectional view showing a general structure of the high-temperature-side thin film in Fig. 9 .

FIG. 11 is a cross-sectional view showing a general structure of the thin film on the low temperature side in FIG. 9 .

In the picture:

50-vacuum insulation material, 52-outsourcing material, 53-adsorbent, 56-first airtight layer, 56a-resin film, 56b-metal vapor deposition layer, 57, 59-second airtight layer, 58-hot melt Coating layer, 59a-resin film, 59b-layer composed of metal evaporation layer and resin coating, 200-hot water storage tank, 201-heat exchanger, 301~304, 501, 502-vacuum heat insulation material, 310- Vacuum insulation material end, 400-electric kettle, 401-water storage container, 402-lid

Detailed ways

Several embodiments of the present invention will be described below using FIGS. 1 to 3 . FIG. 1 is a cross-sectional view of a vacuum heat insulating material according to an embodiment of the present invention, and FIGS. 2 and 3 are enlarged explanatory views for explaining differences in the film lamination structure of the covering material 52 of FIG. 1 .

In Fig. 1 and Fig. 2, the structure of the vacuum insulation material 50 includes: a core material 51 made of inorganic fiber polymer; The covering layer 58 consists of four layers: an outer covering material 52 laminated with a two-component hardening type urethane-based adhesive (not shown); an adsorbent 53;

Although the core material 51 made of the inorganic fiber polymer used here is suitable for inorganic fiber polymers such as glass fiber (glass wool, glass fiber), silicon fiber, alumina fiber, silica-alumina fiber, ceramic fiber, etc., it is not special limited.

In addition, although the airtightness of the outer cover material 52 is ensured by combining the airtight layers 56 and 57, here a metal layer is provided on both the first airtight layer 56 and the second airtight layer 57 in order to enhance the airtightness. . As the metal layer of these airtight layers, a metal layer obtained by forming a metal film on a base material with a metal foil or a resin film is used. The metal foil is not particularly limited to stainless steel foil, iron foil, copper foil, titanium foil, and the like.

The method of forming the metal film includes vacuum evaporation, sputtering, ion plating, etc., and there is no particular limitation as long as the film thickness is within the range of 300 to 1000 Ȧ. Also, the adhesive (not shown) is not particularly limited except for a specific portion, and extrusion lamination or thermal lamination without an adhesive may be used.

As for the adsorbent 53, when the vacuum heat insulating material 50 is used in a high-temperature environment, by using a hydrophobic adsorbent, since the lamination film of the outer covering material 52, the adhesive for lamination, and the adhesive used for lamination can be used Organic gas components such as solvent-based residues are preferentially adsorbed, so the thermal insulation performance can be maintained for a longer period of time.

FIG. 3 shows a structure of an outer covering material different from FIG. 2 , and a resin material is applied to the vapor-deposited surface of the metal vapor-deposited layer of the second airtight layer 59 . Specifically, the description of each Example will be described.

Although the embodiments of the present invention will be described in detail below, the same symbols in each embodiment represent the same items or equivalents. Except for the points described in the description of each embodiment, since it is basically the same as Embodiment 1, repeated description is omitted.

Table 1 Outer material film structure Adsorbent Thermal conductivity (W/m·K) Whether there is any change in appearance, etc. early stage Equivalent to after 5 years Example 1 ONY/PETvm/AL/CPP A 0.0022 0.0064 no change Example 2 ONY/PETvm/AL/CPP B 0.0021 0.0058 no change Example 3 ONY/PETvm/AL/CPP A+C 0.0022 0.0059 no change Example 4 ONY/PETvm/AL/CPP B+C 0.0020 0.0058 no change Example 5 ONY/PETvm/emEVOH/CPP A+C 0.0022 0.0079 no change Example 6 PET/ONYvm/AL/PBT A+C 0.0023 0.0053 no change Comparative example 1 ONY/PET/AL/HDPE A 0.0020 0.0098 The thermal cladding layer melts lightly Comparative example 2 ONY/PETvm/emEVOH/HDPE A 0.0018 0.0152 The thermal cladding layer melts lightly Comparative example 3 ONY/PET/AL/CPP B 0.0026 0.0109 no change Comparative example 4 ONY/vmPET/AL/CPP A 0.0021 0.0074 no change

In the table:

ONY: Polyamide film A: Hydrophilic synthetic zeolite

PET: Polyethylene terephthalate film B: Calcium oxide

AL: aluminum foil C: hydrophobic synthetic zeolite

CPP: Non-stretched polypropylene film

EVOH: Ethylene-vinyl alcohol polymer resin film

PBT: Polybutylene terephthalate film (heat-meltable multi-layer product)

HDPE: High Density Polyethylene Film

vm: aluminum evaporation

em: aluminum vapor deposition + resin coating

Table 1 shows the outline of Examples 1 to 6 and Comparative Examples 1 to 4 described first. In each example, the initial thermal conductivity and the thermal conductivity after 5 years were measured for the thin film structure of the outer covering material and the adsorbent, and the deformation state such as the appearance was observed.

Example 1

The first example is an example in which the film structure of the wrapping material 52 is formed as shown in FIG. 2 in the vacuum heat insulating material 50 shown in FIG. 1 . A binder-free glass wool laminate having an average fiber diameter of 4 μm was used as the core material 51 .

The specific structure of the covering material 52 of Example 1 is shown. Polyamide film (ONY) is used as the outermost surface protection layer 55, and polyethylene terephthalate (PET) is used as the resin film 56a for the first airtight layer 56 provided inside the surface protection layer 55. , and vapor-deposit aluminum with a thickness of 400-500 Ȧ as the metal vapor-deposition layer 56b. In addition, the second airtight layer 57 is an iron-mixed aluminum foil (AL) having a thickness of 6 μm. In addition, the aluminum vapor-deposited surface of the first airtight layer 56 and the aluminum foil of the second airtight layer 57 are bonded to face each other. An adhesive having a melting point higher than that of the heat-welded layer 58 is used for laminating the metal vapor-deposited layer and the metal foil layer. A non-stretched polypropylene film is used for the heat-welded layer 58 , and the heat-resistant temperature of the cover material 52 as a whole is raised.

As the adsorbent 53 housed inside the core material 51, a hydrophilic synthetic zeolite having an average pore diameter of 9 Ȧ was used. Hydrophilic synthetic zeolites use physical adsorbents to adsorb gases with a molecular diameter smaller than the pore diameter. In addition, although the inner covering material 54 is provided between the outer covering material 52 and the core material 51 so as to surround the core material 51 on the inner side than the outer covering material 52, the inner covering material 54 may not be used. The outer covering material 52 is covered from the outside in a state where the core material 51 and the adsorbent 53 are enclosed in the inner covering material 54 .

For the airtightness of the outer covering material 52, the metal foil layer formed by aluminum foil and the metal vapor-deposited layer produced by aluminum vapor deposition are used in combination, and the small holes unique to the metal vapor-deposited layer and the metal foil are closed, and the airtightness can be strengthened as a result. sex. Although the combination of the film layers of the outer covering material 52 uses a two-component curing type polyester urethane adhesive, there is no special method except for bonding the two metal layers formed by the vapor deposition layer and the foil layer. limited. Note that the binder will be described later.

The vacuum heat insulating material 50 can be obtained by drying the core material 51 made of a glass wool laminate at 230°C for a certain period of time, and cutting an incision obliquely with respect to the thickness direction of the core material 51, then putting the adsorbent 53 into it, and packing it. The inner covering material 54 is put in, and is compressed together with the inner covering material 54 in the thickness direction of the core material 51 to degas the inside and temporarily seal it. It can be packed into the dried outer wrapping material 52, and in the state where one end of the inner wrapping material 54 is cut off and opened, and kept under a vacuum degree of 2.2 Pa for a period of time, one end of the outer wrapping material 52 is thermally welded.

The adsorbent 53 is accommodated in the inclined cuts provided on the restorative core material 51 , so the openings are overlapped and narrowed after vacuum stretching, and there is no looseness or the like inside the core material 51 . In addition, since no binder is used for the core material 51 , the existence of the core material 51 does not act as a resistance to adsorption when adsorbing gas components and moisture inside the sheath material 52 .

As for the binder, it can be further supplemented. In this embodiment, the vacuum degree inside the outer casing material 52 is maintained by welding the heat-welding layer 58, and the melting point of the heat-welding layer 58 is of course higher than the temperature used by the vacuum insulation material (for example, in a hot water supplier). 110°C) high. In addition, the temperature of the heat source for welding the heat welding layer 58 is naturally higher than the melting point of the heat welding layer 58 .

The adhesive for laminating the metal layers not only has a higher melting point than the thermally welded layer 58 as described above, but also must use a substance higher than the welding temperature. In this case, when the thermally welded layer 58 is thermally welded in the manufacturing process, the bond between the metal layers will not be detached, and high airtightness can be maintained.

In this embodiment, the bonding between the metal foil layer and the vapor-deposited metal layer uses an adhesive made of a thermosetting resin. A thermosetting resin is a resin that cures when heated. Once a thermosetting material is cured, it will not soften even if it is reheated, and is suitable for use in a high-temperature environment. Specifically, it is a polyester polyol-based/polyisocyanate urethane-based binder. The adhesive performs bonding by reacting polyester polyol and polyisocyanate to form urethane bonds. That is, the produced adhesive film formed a urethane bond. Therefore, it can be called a polyurethane-based adhesive type polyester-based adhesive.

Such adhesives have the ability to break urethane bonds at a certain temperature. Microscopically, the adhesive of this embodiment begins to break at about 200°C, but the bonding is almost not peeled off. The time required for actual thermal cladding is about 1 to 2 seconds, and since the melting point of the thermal cladding layer is 160° C., even if the outer cover material 52 is thermally clad and bonded, it will not peel off.

Actually, the temperature of the heat source at the time of heat welding is 180 to 200° C., and the adhesion does not peel off even when the outer cover material 52 is heat welded. In addition, even if the thermal welding operation was performed within one minute at a heat source temperature of 200° C. or higher, no deterioration was observed in the adhesive layer.

Furthermore, so-called thermal bridges, even in the respective structures of the casing material 52 , are caused in particular by the high thermal conductivity of the metal layer. That is, the temperature of the metal layer (the aluminum foil and aluminum vapor-deposited film in Example 1) tends to increase easily in the actual use state. Therefore, the bond between the two metal layers is relatively easy to detach from the bond of other layers.

In the present embodiment, since the binder composed of the above-mentioned thermosetting resin is used, high airtightness can be maintained even in long-term use. In addition, the same effect can be expected even if an adhesive having a melting point higher than the melting point of the heat-welding layer and the heat-welding temperature (heat source temperature) is used instead of an adhesive made of a thermosetting resin.

The thermal conductivity showing the thermal insulation performance of the vacuum heat insulating material 50 thus obtained was measured at an average temperature of 24° C. with a thermal conductivity measuring device AUTO-Λ manufactured by Eiko Seiki Co., Ltd. The vacuum heat insulating material 50 to be measured will be described using FIG. 4 . Fig. 4 is a cross-sectional view showing a vacuum heat insulating material 50 for measuring thermal conductivity. As in the example shown in FIG. 1 , the core material 51 is covered with the sheath material 52 and the inside is sealed in a decompressed state. The portion surrounded by a dotted line is the ear portion 52 a of the covering material 52 . In this way, there is an ear portion 52a on the peripheral edge portion of the outer cover material 52, although in the actual use state, it is often bent and used (refer to FIG. 1 ), but as shown in FIG. Thermal conductivity.

When the thermal conductivity was measured, the initial value showed a good value of 0.0022 (W/m·K). In addition, regarding the degradation of thermal insulation performance when used in a high-temperature environment, the maximum operating temperature is 110°C, and the thermal conductivity value equivalent to 5 years after considering certain operating conditions is used for comparison. In this example, the value of the thermal conductivity corresponding to the passage of 5 years was 0.0064 (W/m·K), and it was confirmed that sufficient thermal insulation performance was maintained. In addition, the appearance of the vacuum heat insulating material 50 does not change in particular.

Example 2

In the second example, the vacuum heat insulating material 50 was produced under the same conditions as in the first example except that the adsorbent 53 was made of calcium oxide. Calcium oxide is a hydrophilic chemical adsorbent that absorbs water and becomes calcium hydroxide.

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 obtained in this way was measured in the same manner as in Example 1, the initial value was 0.0021 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0068 (W/m·K), and it was confirmed that sufficient thermal insulation performance was maintained. In addition, the appearance of the vacuum heat insulating material 50 does not change in particular.

Example 3

In the third embodiment, except that the hydrophobic synthetic zeolite with an average pore diameter of 6 Ȧ or more and the hydrophilic synthetic zeolite with an average pore diameter of 9 Ȧ are used together as the adsorbent 53, vacuum insulation is produced under the same conditions as in Example 1. Thermal Material 50. The hydrophobic synthetic zeolite is a physical adsorbent, has a SiO ₂ /Al ₂ O ₃ ratio of 20 or more, and is an incombustible high silica zeolite.

When the thermal conductivity indicating the heat insulating performance of the thus obtained vacuum heat insulating material 50 was measured in the same manner as in Example 1, the initial value was 0.0022 (W/m·K). The rate value was 0.0059 (W/m·K). In addition, the appearance of the vacuum heat insulating material 50 does not change in particular.

In Example 3, by using a hydrophilic adsorbent and a hydrophobic adsorbent in combination, while the hydrophilic adsorbent preferentially adsorbs moisture, the hydrophobic adsorbent preferentially adsorbs the laminated film of the outer covering material 52, the adhesive for lamination, and Since the organic gas component generated from the residue of the solvent used during lamination, etc., it is considered that the thermal insulation performance can be maintained for a long time higher than that of Example 1. In particular, in a high-temperature environment where organic gas is likely to be generated, it was found that the combined use of both adsorbents is effective.

Example 4

In the fourth example, a vacuum heat insulating material 50 was produced under the same conditions as in Example 1, except that a hydrophobic synthetic zeolite having an average pore diameter of 6 Å or more and calcium oxide were used as the adsorbent 53 together.

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 obtained in this way was measured in the same manner as in Example 1, the initial value was 0.0020 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0059 (W/m·K). In addition, there is no particular change in the appearance of the vacuum heat insulating material 50 .

Example 4 shows that similarly to Example 3, the combined use of a hydrophilic adsorbent and a hydrophobic adsorbent is effective. This effect shows that the hydrophilic adsorbent is effective even if it is a chemical adsorbent. In addition, calcium oxide is a chemical adsorbent that only absorbs moisture, and if moisture is adsorbed, it will not be released under normal circumstances.

Even in the case of such a chemical adsorbent, it can be seen that (1) the adsorption of organic gas is necessary to ensure long-term reliability (2) In the long-term adsorption of organic gases, not only hydrophilic adsorbents that can adsorb organic gases, but also hydrophobic adsorbents that can adsorb organic gases are also effective.

Example 5

In the fifth embodiment, since the vacuum heat insulating material 50 shown in FIG. 1 is composed of a film of the outer covering material 52 with the structure shown in FIG. 3 , the second airtight layer 59 is made of an ethylene-vinyl alcohol polymer resin film. 59a is the substrate, and aluminum is vapor-deposited to a thickness of 400-500 Ȧ to form a vapor-deposited layer, and a resin material (layer 59b composed of a metal vapor-deposited layer and a resin coating layer) is coated on the vapor-deposited surface. As the adsorbent 53, the hydrophobic synthetic zeolite with an average pore diameter of 6 Ȧ or more and the hydrophilic synthetic zeolite with an average pore diameter of 9 Ȧ were used in the same manner as in Example 3. Other conditions are the same as in Example 1.

The second airtight layer 59 of the cover material 52 is deposited with aluminum in order to reduce the thermal bridge generated by the aluminum foil, and to realize the airtightness near the aluminum foil which should compensate for the airtightness, and to apply a resin material. The material used for the coating layer of the resin material may have flexibility, for example, polyacryl-based, epoxy-based, etc., but not limited thereto.

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 obtained in this way was measured in the same manner as in Example 1, the initial value was 0.0022 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0079 (W/m·K). In addition, the appearance of the vacuum heat insulating material 50 does not change in particular.

Example 6

In the sixth embodiment, polybutylene terephthalate (PBT) is used as the heat-welding layer 58 in order to improve the heat resistance and enhance the airtightness in the film structure of the cover material shown in FIG. 2 . Polybutylene terephthalate (PBT) has a higher melting point than non-stretched polypropylene resin film (CPP), and improves heat resistance. In addition, polyethylene terephthalate (PET) having a higher melting point than polyamide film (ONY) is also used for the surface protection layer 55 in accordance therewith.

Polybutylene terephthalate (PBT) needs to be heated to about 200-220°C in order to ensure the welding strength of the thermally welded part, and the surface protection layer 55 is made of polyethylene terephthalate (PET). The first airtight layer 56 has a structure in which aluminum is evaporated to a thickness of 400 to 500 Ȧ on a polyamide film (ONY). In addition, as the adsorbent 53, the hydrophobic synthetic zeolite with an average pore diameter of 6 Ȧ or more and the hydrophilic synthetic zeolite with an average pore diameter of 9 Ȧ were used in the same manner as in Example 3. Other conditions are the same as in Example 1.

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 thus obtained was measured in the same manner as in Example 1, the initial value was 0.0023 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0053 (W/m·K). In addition, the appearance of the vacuum heat insulating material 50 does not change in particular.

Comparative example 1

The vacuum heat insulating material 50 was produced by the same method as Example 1 for performance comparison. In the vacuum heat insulating material 50 shown in FIG. 1, the film of the cover material 52 was made into the structure normally used for a refrigerator and compared. In Fig. 2, the surface protection layer 55 is made of polyamide film (ONY), the first airtight layer 56 is made of polyethylene terephthalate (PET), and the second airtight layer 57 is mixed with a thickness of 6 μm. Aluminum foil (AL) made of iron is used as the heat-welded layer 58 to form the cover material 52 using high-density polyethylene, and the adsorbent 53 is made of hydrophilic synthetic zeolite. Other conditions are identical with embodiment 1.

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 obtained in this way was measured in the same manner as in Example 1, the initial value was 0.0020 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0098 (W/m·K), which resulted in a large degree of deterioration. In addition, the appearance of the vacuum heat insulating material 50 was changed, and it was observed that the thermally welded layer 58 was in a thermally welded state.

Comparative example 2

As the comparative example 2, the vacuum heat insulating material 50 was produced by the method similar to the comparative example 1. In the vacuum heat insulating material 50 shown in FIG. 1, the film which strengthens the airtightness of the outer cover material 52 and reduces a thermal bridge is used, and compares the structure normally used for a refrigerator application. In Fig. 2, the surface protection layer 55 is made of polyamide film (ONY), and the first airtight layer 56 is made of polyethylene terephthalate (PET) as a base material and evaporated aluminum with a thickness of 400-500 Ȧ. , the second airtight layer 57 is made of a polybutylene terephthalate polymer resin film as a base material, and aluminum is vapor-deposited with a thickness of 400-500 Ȧ, and high-density polyethylene is used as the heat-welding layer 58 . As the adsorbent 53, hydrophilic synthetic zeolite is used. Other conditions are identical with embodiment 1.

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 obtained in this way was measured in the same manner as in Example 1, the initial value was 0.0018 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0152 (W/m·K), which resulted in a large degree of deterioration. In addition, as for the change in the appearance of the vacuum heat insulating material 50, similarly to Comparative Example 1, it was observed that the thermally welded layer 58 was in a thermally welded state.

Comparative example 3

As Comparative Example 3, in the vacuum heat insulating material 50 shown in FIG. 1 , it was the same as that of Comparative Example 1 except that the heat-welded layer 58 of the covering material 52 was made of a non-stretched polypropylene film.

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 obtained in this way was measured in the same manner as in Example 1, the initial value was 0.0026 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0109 (W/m·K), which was a result of a large degree of deterioration. In addition, no change in the appearance of the vacuum heat insulating material 50 was particularly observed.

Comparative example 4

As Comparative Example 4, in the configuration of Example 1, the resin film 56a of the first airtight layer 56 is the same as that of Example 1, except that the resin film 56a of the first airtight layer 56 is opposite to that of the metal vapor-deposition layer 56b and the metal vapor-deposition layer 56b is on the surface protection layer 55 side. .

When the thermal conductivity indicating the thermal insulation performance of the vacuum heat insulating material 50 obtained in this way was measured in the same manner as in Example 1, the initial value was 0.0021 (W/m·K), which corresponds to the thermal conductivity after 5 years in this example. The rate value was 0.0074 (W/m·K), which was a result of a greater degree of deterioration than Example 1. In addition, no change in the appearance of the vacuum heat insulating material 50 was particularly observed.

Here, the relationship between Example 5 and Comparative Example 4 will be considered. As mentioned above, the initial values of the thermal conductivity of the two examples are 0.0022 (W/m·K) and 0.0021 (W/m·K), which is equivalent to the thermal conductivity value after 5 years of 0.0079 (W/m·K) , 0.0074 (W/m·K). That is, it was a result inferior to Example 5 and Comparative Example 4 in terms of thermal conductivity.

However, the heat conduction form of a vacuum heat insulating material is generally known to have two types. The first way is to conduct heat through the core material 51 inside the outer covering material 52 , and the second way is to conduct heat through the metal layer mainly including the outer covering material 52 . This second form is called a thermal bridge. In the overall heat conduction of the vacuum heat insulating material, it can be seen that the influence of the thermal bridge is large. Therefore, the improvement of the thermal insulation performance of the whole vacuum heat insulating material is aimed at by reducing a thermal bridge.

In addition, the influence of the thermal bridge is that the thicker the metal layer in the outer covering material 52 is, the greater it is in nature, and when the ear portion of the outer covering material 52 is bent as shown by the dotted line in FIG. heat, and the influence of thermal bridges becomes larger.

In Examples 1-6 and Comparative Examples 1-4, the measurement of thermal conductivity was performed without bending the ear part 52a as shown in FIG. When comparing the structures of Example 5 and Comparative Example 4, Example 5 has a structure in which a resin layer exists between vapor-deposited layers of aluminum, compared to Comparative Example 4 having a metal layer formed of aluminum foil. That is, although the thermal conductivity is about the same as the measured value, it is considered that the ratio of the influence of the thermal bridge (the above-mentioned second mode) is greatly different.

Generally, compared with the thickness of the metal foil layer in the micron order, in the metal vapor-deposited layer, the thickness is in the angstroms, and the influence of heat conduction generated by the thermal bridge is quite different. From these observations, when the ear part 52a is folded and the vacuum heat insulating material of the structure mentioned in Example 5 is used, it is more advantageous than the structure of each comparative example including the comparative example 4.

Therefore, in the actual use mode, in the case of bending the ears and using them, for example, the situation of using the heat insulation box of the refrigerator and the hot water supply equipment (heat pump water supply and electric water supply) described later Kettle) is used, the configuration of Example 5 is more favorable than the configuration of Comparative Example 4.

As mentioned above, in the cases of Examples 1 to 6 and Comparative Examples 1 to 4 described above, it was found that a vacuum heat insulating material excellent in long-term reliability can be provided by using a wrapping material in which a deposited metal layer and a metal foil layer are bonded together. In addition, it was found that when using an outer cover material in which a resin coating is applied between metal vapor-deposition layers, high heat insulation performance can be ensured when the ears are folded and used. In addition, by using together hydrophobic synthetic zeolite as an adsorbent, it was found that the long-term reliability of the vacuum heat insulating material was improved. In addition, no deterioration was observed even with the adhesive bonding the metal layers together.

Next, a hot water supply facility using a vacuum heat insulating material will be described.

Table 2 Outer material film composition Adsorbent Thermal Leakage (Index) Remark existing insulation - - 100 Attached picture, no record in this article Example 7 ONY/PETvm/AL/CPP A+C 71 Example 8 ONY/PETvm/AL/CPP A+C 65 Example 9 ONY/PETvm/AL/CPP A+C 78

In the table:

ONY: Polyamide film A: Hydrophilic synthetic zeolite

PET: Polyethylene terephthalate film C: Hydrophobic synthetic zeolite

AL: aluminum foil

CPP: Non-stretched polypropylene film

vm: aluminum evaporation

Table 2 shows Examples 7 to 9 of vacuum heat insulating materials applied to heat pump water heaters. In each example, the vacuum heat insulating material of the same structure was used, and the amount of heat leakage was measured and compared and examined respectively. Described in detail below.

Example 7

A research example in which a vacuum heat insulating material is applied to a heat pump water heater will be described with reference to FIGS. 5 and 6 . FIG. 5 shows a hot water storage tank 200 and a refrigerant pair heat exchanger 201 of the heat pump hot water supplier. In addition, FIG. 6 shows a section A-A portion of FIG. 5 .

The seventh embodiment is an embodiment in which vacuum heat insulating materials 301 and 302 are provided on the outer periphery of the hot water storage tank 200 shown in FIG. As the vacuum heat insulating materials 301 and 302, vacuum heat insulating materials having the same specifications as those in Example 3 were used.

In Example 7, as shown in FIG. 6( a ), the vacuum heat insulating material 301 is bent and pasted along the arc of the outer periphery of the hot water storage tank 200 , and the length between the ends 310 of the vacuum heat insulating material 301 in the bending direction is Overlap configuration. In addition, the vacuum heat insulating material 302 is bent and pasted along the arc of the outer periphery of the refrigerant pair heat exchanger 201, and the ends of the vacuum heat insulating material 301 in the bending direction are overlapped. At this time, the shape of the end portions 310 has a stepped shape in the plate thickness direction as shown in FIG. 6( d ), and the thickness of the overlapping portion between the end portions 310 may not protrude.

The amount of heat leakage of the hot water storage tank of this example was compared with that of heat insulating materials (glass wool alone, phenolic foam, etc., hereinafter referred to as "conventional heat insulating materials") generally used in building materials such as houses. As a result, a heat leakage reduction effect of 29% was obtained.

Example 8

In the eighth embodiment of the present invention, the outer periphery of the hot water storage tank 200 shown in FIG. Vacuum heat insulating materials 301-304, as shown in FIG. 6(b), are bent and pasted along the arc of the outer circumference of the hot water storage tank 200. overlapping configurations. On this vacuum heat insulating material 301, another vacuum heat insulating material 303 is pasted in the same manner as the vacuum heat insulating material 301 in a state rotated by 180° in the circumferential direction.

In addition, the vacuum heat insulating material 302 is bent and pasted along the arc of the outer periphery of the refrigerant pair heat exchanger 201, and the ends of the vacuum heat insulating material 301 in the bending direction are overlapped. Another vacuum heat insulating material 304 is pasted on this vacuum heat insulating material 302 in the same manner as the vacuum heat insulating material 302 is rotated by 180° in the circumferential direction. At this time, the shape of the end portion 310 of each vacuum heat insulating material has a stepped shape in the plate thickness direction as shown in FIG.

Compared with the case of using the conventional heat insulating material, the heat leakage amount of the hot water storage tank part of the present example was reduced by 35%.

Example 9

As the ninth embodiment, a vacuum barrier with the same specifications as that of the third embodiment is arranged on the outer periphery of the hot water storage tank 200 shown in FIG. Thermal materials 301 and 302, as shown in FIG. 6(c), are bonded by bending the vacuum heat insulating material 301 along the circular arc of the outer periphery of the hot water storage tank 200, and the ends of the above-mentioned vacuum heat insulating material 301 in the bending direction are overlapped. configuration. Then, the vacuum heat insulating material 302 is bent and pasted along the arc of the outer periphery of the refrigerant pair heat exchanger 201, and the ends of the vacuum heat insulating material 301 in the bending direction are overlapped.

Compared with the case of using the conventional heat insulating material, the heat leakage amount of the hot water storage tank of the present example was reduced by 22%.

When examining the above-mentioned Examples 7 to 9, it was confirmed that the effect of exhibiting sufficient heat-shielding performance was confirmed even in a high-temperature environment. In addition, compared with Examples 7 and 8, Example 9 had a lower heat leakage reduction effect. From these results, it can be seen that (1) the vacuum heat insulating material of this example can sufficiently withstand use even in a high-temperature environment reaching 80° C. or higher (Examples 7 to 9); (Comparison of Example 8 and Example 9); (3) When the ends of the vacuum insulation materials used are overlapped and arranged, the heat insulation performance is improved (Comparison of Example 7 and Example 9 Comparison); (4) It is also effective to use a vacuum heat insulating material with a stepped shape (Example 8).

Next, another example of the hot water supply facility using the vacuum heat insulating material will be described.

table 3 Outer material film composition Adsorbent Holding time (index) Remark no insulation - - 100 Attached picture, no record in this article Example 7 ONY/PETvm/emEVOH/CPP A+C 271 Example 8 ONY/PETvm/emEVOH/CPP A+C 193

In the table:

ONY: Polyamide film A: Hydrophilic synthetic zeolite

PET: Polyethylene terephthalate film C: Hydrophobic synthetic zeolite

EVOH: Ethylene-vinyl alcohol polymer resin film

CPP: Non-stretched polypropylene film

vm: aluminum evaporation

em: aluminum vapor deposition + resin coating

Table 3 shows the summary of Examples 10 and 11 of vacuum heat insulating materials applied to electric kettles. In each example, the vacuum heat insulating material of the same structure was used, and the heat leakage was measured, and compared and studied respectively. Described in detail below.

Example 10

As a research example of using the vacuum heat insulating material of the present invention in an electric kettle, it will be described using Fig. 7 and Fig. 8 . FIG. 7 shows an electric kettle 400 including a water storage container 401 and a lid 402 . In addition, FIG. 8 shows a section B-B in FIG. 7 . In the tenth embodiment of the present invention, a vacuum heat insulating material 501 having the same specification as that of the fifth embodiment is pasted on the outer periphery of the water storage container 401 in FIG. 7 as shown in FIG. The holding time is compared with the cooling time of the hot water temperature to 80°C. The vacuum heat insulating material 501 is bent and pasted along the arc of the outer circumference of the water storage container 401 , and the ends of the vacuum heat insulating material 501 in the bending direction are overlapped. In addition, since the size of the vacuum heat insulating material 503 that can be used for the heat insulation reinforcement of the cover part 402 is small, the influence of the thermal bridge of the covering material becomes large, so the ears are arranged without being folded.

When the case where there is no vacuum heat insulating material is set to 100, the heat retention time in this example is 217, and a change in heat insulating performance can be confirmed.

Example 11

As an eleventh example, in FIG. 7, a vacuum heat insulating material 501 having the same specifications as that of Example 5 is arranged on the outer periphery of a water storage container 401 as shown in FIG. 8(b), and the vacuum heat insulating material 501 is placed The circular arc of the outer periphery of 401 is pasted in a curved manner, and the ends of the length in the bending direction of the vacuum heat insulating material 501 are arranged so as not to overlap each other.

When the case of no vacuum heat insulating material is set as 100, the holding time of this example is 193, and the effect is about 11% lower than that of Example 10 due to the influence of the thermal bridge at the end of the vacuum heat insulating material.

As described above, the vacuum heat insulating material of the present invention can suppress deterioration of heat insulating performance even in a high temperature range of 80° C. or higher, and can maintain the heat insulating performance for a long period of time. From the above-mentioned respective examples, it can be confirmed that there is no problem in use in a high temperature range of at least 110°C.

As a result, at least the above-mentioned temperature range is the upper limit of the application field where the heat insulation effect can be exerted, and it is not limited to the hot water supply equipment described in the examples. Of course, it is also applicable to refrigerators, refrigerators, bathtubs, automobiles and trains. It can also be widely applied to machines and equipment that require heat insulation, such as vehicles, houses, and residential equipment.

In addition, as the first airtight layer, polyamide resin film (PA), ethylene-vinyl alcohol polymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET) resin film is used as the base material, and any metal film of aluminum (AL) or stainless steel (SUS) is formed on one side of the product, and aluminum foil (AL) is used as the second airtight layer , stainless steel foil (SUS), and iron foil (Fe), use a laminated film that is laminated so that the metal layers of the first and second airtight layers face each other, and use a non-extensible polymer Either one of acrylic resin film (CPP) and polybutylene terephthalate resin film (PBT) is used as the thermal welding layer, and the surface protection layer is a multilayer of resin film with a higher melting point than the thermal welding layer. In the laminated structure, the metal film directly closes the small holes unique to the metal foil, so the airtightness is high, and the ingress of air and moisture from the outside can be suppressed.

This effect can also be maintained by sandwiching the resin coating between two metal vapor-deposited layers. Especially in vacuum insulation materials used by bending the ear, the improvement of airtightness and the reduction of thermal bridges can be maintained for a long time. Reduce the resulting high thermal insulation properties.

Claims (12)

1. vacuum heat insulation material; possess the core that constitutes by the inorfil polymer, have the outsourcing material of sealer and innerliner and hot melt coating and adsorb the moisture of above-mentioned core and above-mentioned outsourcing material and the sorbent of gas componant, it is characterized in that:

The innerliner of above-mentioned outsourcing material is first innerliner, second innerliner, with the relative mode lamination of metal covering of two metal layers at least, uses the resin film of fusing point more than 150 ℃ to be used as the hot melt coating.

2. vacuum heat insulation material; the interior packaging material material that possesses the core that constitutes by the inorfil polymer, outsourcing material, above-mentioned core is kept with compressive state on thickness direction with sealer and innerliner and hot melt coating and adsorb above-mentioned core, outsourcing material and in the moisture of packaging material material and the sorbent of gas componant; it is characterized in that

The innerliner of above-mentioned outsourcing material has the clamping adhesive layer and first and second innerliner of two metal layers is at least arranged,

Above-mentioned first innerliner is made of the film that forms metallic film on the single face of resin film base material,

Above-mentioned second innerliner is a metal foil, or one of any in the film of smearing the tightness resin on the metallic film that forms metallic film on the single face of resin film base material and forming,

The innerliner of above-mentioned outsourcing material carries out lamination with the combination of resin thin film layer/metallic film/adhesive layer/metal foil or resin thin film layer/metallic film/resinous coat/adhesive layer/metallic film/resin thin film layer,

Use the resin film of fusing point more than 150 ℃ to be used as being positioned at the hot melt coating that more leans on above-mentioned core one side than innermost layer one side of above-mentioned innerliner; and use than the high resin film of above-mentioned hot melt coating fusing point and be used as being positioned at than outermost surface one side of the above-mentioned innerliner sealer of part more in the outer part

Above-mentioned core does not contain Bond and has restoratively on thickness direction, and above-mentioned sorbent is contained in that the surface of relative core or thickness direction tilt incision and in the accommodating part that is provided with, the opening of above-mentioned accommodating part overlaps and pressed narrow.

3. vacuum heat insulation material according to claim 1 is characterized in that: contain hydrophobic adsorbent at least and be used as above-mentioned sorbent.

4. vacuum heat insulation material according to claim 2 is characterized in that: contain hydrophobic adsorbent at least and be used as above-mentioned sorbent.

5. according to each described vacuum heat insulation material in the claim 1～4, it is characterized in that:

Employed outsourcing material is made of following multi-layer laminated films:

Use is with polyamide resin membrane of lipoprotein (PA), ethylene-vinyl alcohol polymer resinous thin film (EVOH), polyvinyl alcohol resin film (PVA), any resin film is a base material in the polyethylene terephthalate resin film (PET), and make aluminium (AL) at its single face, the goods of any metal film forming are used as above-mentioned first innerliner in the stainless steel (SUS), use aluminium foil (AL), stainless steel foil (SUS), any metal foil is as above-mentioned second innerliner in the iron foil (Fe), the laminated film of fitting in relative mode between the metal layer of above-mentioned first and second innerliner is used as above-mentioned innerliner

Use in no extension acrylic resin film (CPP) and the polybutylene terephthalate resin film (PBT) any to be used as the hot melt coating that on above-mentioned innerliner, makes up, and above-mentioned sealer is the high resin film of specific heat overlay fusing point.

6. according to each described vacuum heat insulation material in the claim 1～4, it is characterized in that:

Employed outsourcing material is made of following multi-layer laminated films:

Use with any resin film in polyamide resin membrane of lipoprotein (PA), ethylene-vinyl alcohol polymer resinous thin film (EVOH), polyvinyl alcohol resin film (PVA), the polyethylene terephthalate resin film (PET) and be base material, and make the goods of any metal film forming in aluminium (AL), the stainless steel (SUS) be used as above-mentioned first innerliner at its single face

Use with any resin film in ethylene-vinyl alcohol polymer resinous thin film (EVOH), polyvinyl alcohol resin film (PVA), the polyethylene terephthalate resin film (PET) and be base material, and the goods that are provided with tightness resin smear layer in aluminium (AL), the stainless steel (SUS) on any metal film forming that make on its single face are used as above-mentioned second innerliner

Above-mentioned innerliner is made of first and second innerliners, for by the laminated film of fitting in relative mode between the metal layer of above-mentioned first and second innerliner,

Use in no extension acrylic resin film (CPP) and the polybutylene terephthalate resin film (PBT) any to be used as the hot melt coating that on above-mentioned innerliner, makes up, and above-mentioned sealer is the high resin film of specific heat overlay fusing point.

7. according to each described vacuum heat insulation material in the claim 1～4, it is characterized in that:

As the Bond between bonding above-mentioned first innerliner and above-mentioned second innerliner, use thermosetting resin or have than the high Bond of above-mentioned hot melt coating fusing point.

8. vacuum heat insulation material according to claim 5 is characterized in that:

As the Bond between bonding above-mentioned first innerliner and above-mentioned second innerliner, use thermosetting resin or have than the high Bond of above-mentioned hot melt coating fusing point.

9. vacuum heat insulation material according to claim 6 is characterized in that:

As the Bond between bonding above-mentioned first innerliner and above-mentioned second innerliner, use thermosetting resin or have than the high bonding material of above-mentioned hot melt coating fusing point.

10. according to claim 3 or 4 described vacuum heat insulation materials, it is characterized in that:

Above-mentioned hydrophobic adsorbent is SiO ₂/ Al ₂O ₃Than being more than 20 and being not combustible silica-rich zeolite.

11. a hot water supply apparatus in the hot water supply apparatus such as heat pump type that possess heat storage tank at least, is characterized in that:

Along circular-arc ground of above-mentioned heat storage tank periphery curved configuration, and above-mentioned arc end part heat insulation disposed double at least with each described vacuum heat insulation material of claim 1～10.

12. an electric drive type hot water, it is to have function that water is boiled and heat insulation function at least, and by the electric drive type hot water that external frame container and water storage constitute with container and cap, it is characterized in that:

With each described vacuum heat insulation material of claim 1～10 along above-mentioned water storage with container periphery curved configuration, and the configuration of the end of the bending direction of above-mentioned vacuum heat insulation material is double.

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