CN102850962B - Gum for artificial grass - Google Patents

Abstract

The invention discloses an artificial turf back glue, which comprises the following components: 100 parts of PP, 5-100 parts of EVA, 5-10 parts of paraffin, 0.1-0.5 parts of antioxidant, 0.1-0.5 part of anti-ultraviolet agent, the above components by weight The component ratio is based on the weight of 100 parts of PP. Compared with the prior art, the artificial turf back glue provided by the present invention solves the above-mentioned defects of the prior art, and has the advantages of environmental protection, good weather resistance, recyclable utilization and the like.

Description

Adhesive for artificial grass

technical field

The invention relates to the field of artificial turf, in particular to a back glue of artificial turf.

Background technique

Because artificial turf has the advantages of anti-aging, sun protection, waterproof, non-slip, wear-resistant, comfortable feet, bright color, long service life, low maintenance costs, and all-weather use, it has recently been used in stadiums, schools, hotels and buildings. It has been widely used in many occasions such as roofs. At present, the structure of the existing artificial turf is mainly composed of grass, grass bottom and back glue. Generally, grass and grass bottom are made of thermoplastic polymer materials, such as grass is mainly made of polyethylene, grass bottom is mainly made of polypropylene, and back glue is usually made of thermosetting cross-linked polymer materials such as vulcanized carboxylated styrene-butadiene rubber or polyurethane. The function of the back glue is to fix the grass on the grass bottom, so that the grass is not easy to pull out from the grass bottom. The adhesive should be able to bond polyethylene and polypropylene together, and at the same time have certain strength, water resistance, heat resistance, cold resistance, anti-aging and other properties. For example, the existing artificial turf back glue is usually made of carboxylated styrene-butadiene latex, calcium carbonate, sulfur, and accelerators. Specifically, at a certain temperature (such as above 145°C), the carboxyl group is triggered by the vulcanization system (sulfur, accelerator) Cross-linking of styrene-butadiene latex to obtain vulcanized carboxylated styrene-butadiene rubber. The vulcanized carboxylated styrene-butadiene rubber is a thermosetting polymer material. The molecular chain is in a cross-linked network structure.

In the existing artificial turf, the grass and grass bottom are made of thermoplastic polymer materials such as polyethylene and polypropylene, while the back glue is made of thermosetting polymer materials such as vulcanized carboxylated styrene-butadiene rubber or cross-linked polyurethane. As we all know, thermoplastic polymer materials can be processed and shaped by repeated heating, softening, cooling and solidification within a specific temperature range. However, after the thermosetting cross-linked polymer material is vulcanized and molded at a certain temperature, it can no longer be reprocessed and molded by raising the temperature. Therefore, the compatibility between the two is poor, and they cannot be recovered and reused at the same time by methods such as melt blending. Therefore, the existing artificial turf prepared by materials such as polyethylene, polypropylene, carboxylated styrene-butadiene rubber or polyurethane cannot be uniformly recycled and reused. On the one hand, disposal or incineration will lead to environmental pollution and waste of resources; on the other hand, the separation of grass and grass bottom from the adhesive for recycling will lead to high recycling costs.

At present, the existing adhesive materials mainly have the following disadvantages:

1. Not environmentally friendly:

A. The volatilization of VOC is not conducive to environmental protection: the back glue of conventional artificial grass is generally carboxylated styrene-butadiene latex or non-plasticized vinyl acetate-ethylene copolymer emulsion as the main material. Since the reaction rate of monomers in the polymerization process can only reach more than 90%, the latex will contain a certain amount of volatile organic compounds (VOC) in this case. In the next production process: There will be a large amount of harmful gas released in the process of glue mixing, glue application and back glue baking, which will have a negative impact on the health of the staff and will also pollute the surrounding environment to a certain extent. Moreover, the VOC in the adhesive cannot be volatilized all at once, and it will cause harm to consumers during the use of the next finished product, and it will also cause pollution to the use environment. B. The existence of heavy metals will cause certain pollution to the environment: in the latex production process of adhesive backing, a certain amount of calcium substances are generally added to the main material latex as fillers, and heavy calcium is generally used as fillers for cost-saving production of fake and inferior products. In this case, the heavy metal content in heavy calcium is generally relatively high. Therefore, in the actual use process, it will cause certain harm to the health of consumers, especially the development of young people.

2. The weather resistance is not good enough, especially in terms of acid and alkali resistance: because the back glue of traditional artificial grass is made by mixing latex and inorganic calcium powder and then baked, powder will fall off to varying degrees in general acid resistance tests And there is a certain amount of air bubbles (mainly CO ₂ produced by the reaction of calcium carbonate and acid), so the back glue immersed in the acidic environment for a long time in industrially developed areas is prone to pulverization.

3. Non-recyclable waste of energy: Since the traditional artificial turf adhesive contains a lot of inorganic fillers, and is generally used in black, this causes great difficulties for recycling, and it is difficult in general plastic parts. The cost of filling and modification is generally very high, so the general artificial grass will be disposed of as garbage when it reaches the end of its life. Since the degradation cycle of plastic generally takes a long time, this is another big pollution to the environment. It is also a big waste for the increasingly scarce energy.

Contents of the invention

In view of the above defects, the technical problem solved by the present invention is to provide a back glue for artificial grass, which solves the above defects of the prior art, and has the advantages of environmental protection, good weather resistance, and recyclable utilization.

In order to solve the above technical problems, the back glue of the artificial grass provided by the present invention comprises the following components:

The above components are proportioned by weight, based on the weight of 100 parts of PP; after adding other auxiliary materials, use a high-speed mixer to blend and mix the ingredients. The mixed materials are sheared by the screw at a high temperature of 140~220 degrees. Cut to form the melted glue, and distribute the melted glue horizontally through the buffer of the glue tank, and then carry out the back glue coating process under the action of the scraping device and the gravity self-leveling effect, the back glue is in the process of passing through the oven to improve the appearance of the grass The effect and the control of the binding force of the adhesive. When applying the adhesive, the temperature on the grass side is controlled at 50-80 degrees, and the temperature on the adhesive side is controlled at 100-150 degrees.

Preferably, the back glue of the artificial grass also includes rosin, wherein the proportion of rosin is 0.1-15 parts, and the above components are proportioned by weight.

Preferably, the back glue of the artificial grass also includes fibers, wherein the proportion of the fibers is 0.1-1 part, and the above components are proportioned by weight.

Preferably, the back glue of artificial grass includes the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Preferably, the back glue of artificial grass includes the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Preferably, the back glue of artificial grass includes the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Preferably, the back glue of artificial grass includes the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Preferably, the following components are included:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Compared with the prior art, the artificial turf back glue provided by the present invention solves the above defects of the prior art, and has the advantages of environmental protection, good weather resistance, recyclable recycling, etc., specifically as follows:

1. Environmental protection: modified olefin is used as the basic material, and the filling material is also a macromolecular organic compound such as hydrocarbons or hydrocarbon derivatives. During the melting process, the reaction between molecular chains will occur and the molecular chain will become larger. Therefore, in Under normal use, there will be no harmful gas precipitation such as VOC in the back glue; at the same time, because the hydrocarbons are produced by refining crude oil, the resin is pure organic matter, and the production environment does not involve heavy metals, so in In terms of heavy metals, the adhesive is also 100% environmentally friendly;

2. Good weather resistance: the weather resistance of olefins is generally better. In the present invention, an antioxidant is added to prevent the molecular chain of the gum material from being oxidized and anti-oxidant to maintain the inherent state of the molecular chain of the gum; at the same time Add a certain amount of anti-ultraviolet agent to the formula to prevent the molecular chain from changing under the action of ultraviolet light and affect the service life of the adhesive;

3. Recyclable and recyclable: the main materials of the three parts of the grass line in the turf, the base cloth to the back glue are ethylene or propylene and their modified substances-they are all olefins, and their compatibility is relatively high in theory. Well, under high-temperature melting conditions, a chemical bond in "-C=C-" will be broken and recombined between the molecular chains of additional appropriate external conditions or accelerator hydrocarbon substances, thereby forming a bond between molecular chains and molecular chains. A new chemical bond, that is, the cross-linking reaction between polyolefins, so the material after turf crushing and granulation exists alone as a cross-linking modified substance of olefin, which is different from that of olefin itself in terms of fluidity, strength, flexibility, etc. The properties are relatively close, and at the same time, due to the addition of appropriate antioxidants and anti-ultraviolet agents in the process of producing straw and back glue, the material itself has certain weather resistance, so it can be processed and used in the production of general plastic products. Therefore, From grass thread, base cloth to back glue, the entire turf is a complete recyclable system, which can be used as the main raw material of certain plastic products after simple crushing, re-modification and granulation.

Detailed ways

In order for those skilled in the art to better understand the technical solutions provided by the present invention, the following will be described in conjunction with specific embodiments.

The back glue of artificial grass provided by the invention comprises following components:

The above components are proportioned by weight, based on the weight of 100 parts of PP; after adding other auxiliary materials, use a high-speed mixer to blend and mix the ingredients. The mixed materials are sheared by the screw at a high temperature of 140~220 degrees. Cut to form melted glue, distribute the melted glue with a width of 4 meters in the horizontal direction through the buffer of the glue tank, and then carry out the process of coating the back glue under the action of the scraping device and the gravity self-leveling effect; the back glue is in the process of passing through the oven. Improve the appearance of the grass line and the control of the binding force of the adhesive. When applying the adhesive, the temperature on the grass side is controlled at 50-80 degrees, and the temperature on the adhesive side is controlled at 100-150 degrees.

Among them, PP is a modified polypropylene resin, and EVA is a modified material of ethylene-vinyl acetate.

In the initial material selection experiment, 100% PP can also be used as adhesive to complete the adhesive process, but the temperature of the experiment will be 20-50 degrees higher than the improved temperature, and the higher temperature will affect the quality of the grass. At the same time, the film-forming strength of the back glue is not strong enough, and the fluidity of the melt glue is not good, so the binding force of the turf cannot reach the expected value. Therefore, consider adding some appropriate auxiliary materials to modify the material during the modification process.

EVA: It can improve the transparency of the adhesive while reducing the fluidity of the melt adhesive. The melting temperature of EVA is relatively low, the melt index is relatively large (that is, the fluidity is relatively good), and the transparency is relatively high. The fluidity of the melted glue increases with the increase of the amount of EVA, but the strength of the back adhesive film also decreases. When the ratio of EVA to EVA is 1:1, the comprehensive effect of the fluidity of the adhesive and the film-forming strength of the adhesive reaches the best situation; on the contrary, the strength of the film increases with the decrease of the EVA ratio, but the fluidity of the adhesive decreases. In the decline, the decrease of the fluidity of the melt glue directly affects the quality of the back glue. When the addition ratio of EVA is 10 parts, the fluidity of the melt glue and the strength of the back glue form another intersection point.

Although rosin has a certain influence on the transparent color of the back glue to a certain extent, it is very helpful in the adhesion of the back glue. With some help, the binding force of the turf can be increased by 10%-20% under the same conditions by adding appropriate rosin turf. The addition of rosin can effectively reduce the cost of the adhesive, but it will affect the color of the adhesive and the smoothness of the surface. In the range of 0.1-15 parts, the binding force of the turf back glue can be effectively guaranteed under the premise of ensuring the color of the melted glue and the smoothness of the surface.

The addition of paraffin wax is mainly to improve the fluidity of the back glue in the molten state. During the process of turf back glue, it is beneficial for the melt glue to fill the gap between the grass and the bottom, and can improve the stability of the grass on the bottom. The addition of paraffin can effectively improve the fluidity of the adhesive, but with the increase of the proportion of paraffin, the double transparency decreases, and at the same time the wear resistance of the adhesive decreases sharply. The comprehensive effect within the range of 5-10 parts is worth adoption.

The addition of fibers is mainly to improve the strength and toughness of the adhesive. However, with the addition of fiber, the fluidity of the melted glue drops sharply, so the amount of fiber added is usually relatively low, generally controlled within the range of 0.1~1.0.

The addition of antioxidants is mainly to improve the antioxidant capacity of the back glue and improve its weather resistance. To prevent the molecular chain from reacting with external oxides, if the addition ratio is too low, it will affect the oxidation resistance of the adhesive. On the contrary, if you add too much, it will cause waste and affect the cost. According to the prices of different brands of antioxidants in the market, the addition ratio is generally 0.1~0.5 parts.

The addition of anti-ultraviolet agent is mainly to improve the ultraviolet ray ability of the back glue and improve its weather resistance. Prevent the molecular chain from changing under the action of ultraviolet rays and cause decomposition reactions. If the addition ratio is too low, it will affect the anti-UV effect of the adhesive. On the contrary, adding too much will cause waste and affect the cost. According to the prices of different brands of anti-UV agents in the market, the addition ratio is generally 0.1~0.5 parts.

Example 1

The back glue of the artificial grass provided by the present embodiment comprises the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Example 2

The back glue of the artificial grass provided by the present embodiment comprises the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Example 3

The back glue of the artificial grass provided by the present embodiment comprises the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Example 4

The back glue of the artificial grass provided by the present embodiment comprises the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Example 5

The back glue of the artificial grass provided by the present embodiment comprises the following components:

The above components are proportioned by weight and based on the weight of 100 parts of PP.

Compared with the prior art, the artificial turf back glue provided by the present invention solves the above defects of the prior art, and has the advantages of environmental protection, good weather resistance, recyclable recycling, etc., specifically as follows:

1. Environmental protection: modified olefin is used as the basic material, and the filling material is also a macromolecular organic compound such as hydrocarbons or hydrocarbon derivatives. During the melting process, the reaction between molecular chains will occur and the molecular chain will become larger. Therefore, in Under normal use, there will be no harmful gas precipitation such as VOC in the back glue; at the same time, because the hydrocarbons are produced by refining crude oil, the resin is pure organic matter, and the production environment does not involve heavy metals, so in In terms of heavy metals, the adhesive is also 100% environmentally friendly;

2. Good weather resistance: the weather resistance of olefins is generally better. In the present invention, an antioxidant is added to prevent the molecular chain of the gum material from being oxidized and anti-oxidant to maintain the inherent state of the molecular chain of the gum; at the same time Add a certain amount of anti-ultraviolet agent to the formula to prevent the molecular chain from changing under the action of ultraviolet light and affect the service life of the adhesive;

3. Recyclable and recyclable: the main materials of the three parts of the grass line in the turf, the base cloth to the back glue are ethylene or propylene and their modified substances-they are all olefins, and their compatibility is relatively high in theory. Well, under high-temperature melting conditions, a chemical bond in "-C=C-" will be broken and recombined between the molecular chains of additional appropriate external conditions or accelerator hydrocarbon substances, thereby forming a bond between molecular chains and molecular chains. A new chemical bond, that is, the cross-linking reaction between polyolefins, so the material after turf crushing and granulation exists alone as a cross-linking modified substance of olefin, which is different from that of olefin itself in terms of fluidity, strength, flexibility, etc. The properties are relatively close, and at the same time, due to the addition of appropriate antioxidants and anti-ultraviolet agents in the process of producing straw and back glue, the material itself has certain weather resistance, so it can be processed and used in the production of general plastic products. Therefore, From grass thread, base cloth to back glue, the entire turf is a complete recyclable system, which can be used as the main raw material of certain plastic products after simple crushing, re-modification and granulation.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. a back glue of artificial turf, is characterized in that, comprises following component:

The above components are proportioned by weight, based on the weight of 100 parts of PP; after adding other auxiliary materials, use a high-speed mixer to carry out blending and mixing, and the mixed materials are sheared by the screw at a high temperature of 140-220 degrees. Cut to form melted glue, distribute the melted glue horizontally through the buffer of the glue tank, and then carry out the back glue coating process under the action of the scraping device and the gravity self-leveling effect; the back glue is in the process of passing through the oven to improve the appearance of the grass line The effect and the control of the binding force of the adhesive, when applying the adhesive, the temperature on the grass side is controlled at 50-80 degrees, and the temperature on the adhesive side is controlled at 100-150 degrees. 2. The back glue of artificial grass according to claim 1, is characterized in that, comprises following component:

The above components are proportioned by weight and based on the weight of 100 parts of PP. 3. The back glue of artificial grass according to claim 1, is characterized in that, comprises following component:

The above components are proportioned by weight and based on the weight of 100 parts of PP. 4. The back glue of artificial grass according to claim 1, is characterized in that, comprises following component:

The above components are proportioned by weight and based on the weight of 100 parts of PP. 5. The back glue of artificial grass according to claim 1, is characterized in that, comprises following component:

The above components are proportioned by weight and based on the weight of 100 parts of PP. 6. The back glue of artificial grass according to claim 1, is characterized in that, comprises following component:

The above components are proportioned by weight and based on the weight of 100 parts of PP.