CN111745771B - A method for preparing glue-free particleboard from waste heat-treated wood - Google Patents
A method for preparing glue-free particleboard from waste heat-treated wood Download PDFInfo
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- CN111745771B CN111745771B CN202010634031.8A CN202010634031A CN111745771B CN 111745771 B CN111745771 B CN 111745771B CN 202010634031 A CN202010634031 A CN 202010634031A CN 111745771 B CN111745771 B CN 111745771B
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- 239000010875 treated wood Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002918 waste heat Substances 0.000 title claims abstract description 15
- 238000007731 hot pressing Methods 0.000 claims abstract description 50
- 239000002245 particle Substances 0.000 claims abstract description 35
- 239000000853 adhesive Substances 0.000 claims abstract description 22
- 230000001070 adhesive effect Effects 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 7
- 239000002023 wood Substances 0.000 claims description 22
- 238000007873 sieving Methods 0.000 claims description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 15
- 238000002360 preparation method Methods 0.000 abstract description 6
- 238000012805 post-processing Methods 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 229920005610 lignin Polymers 0.000 description 28
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 14
- 230000008569 process Effects 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 8
- 229910000027 potassium carbonate Inorganic materials 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920002488 Hemicellulose Polymers 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000009257 reactivity Effects 0.000 description 5
- 150000004676 glycans Chemical class 0.000 description 4
- 229920002521 macromolecule Polymers 0.000 description 4
- 229920001282 polysaccharide Polymers 0.000 description 4
- 239000005017 polysaccharide Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000007857 degradation product Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229920006125 amorphous polymer Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 229940001941 soy protein Drugs 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/16—Inorganic impregnating agents
- B27K3/20—Compounds of alkali metals or ammonium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
本发明提供一种废旧热处理木材制备无胶刨花板的方法它不添加胶粘剂，制得的刨花板不存在甲醛释放等二次污染问题，同时力学性能优良。该方法包括以下步骤：预处理：将废旧户外用热处理木材置于质量浓度为2‑5％、温度为40‑60℃的碳酸钾溶液中处理1‑2h；颗粒制备：将预处理后热处理木材沥干水分，粉碎，过筛，得到粒径较为均匀的刨花颗粒；组坯热压：刨花颗粒组坯后，将板坯置于压机上进行热压，设定热压温度为150℃‑170℃，热压时间80‑100s/(mm厚度)；后处理：热压完成后，压机卸压至0.05‑0.1MPa即压板即将开启状态，并升高热压温度至200‑220℃保温10min‑20min。The invention provides a method for preparing glue-free particleboard from waste heat-treated wood. No adhesive is added, and the prepared particleboard has no secondary pollution problems such as formaldehyde release, and has excellent mechanical properties. The method includes the following steps: pretreatment: placing waste and old outdoor heat-treated wood in a potassium carbonate solution with a mass concentration of 2-5% and a temperature of 40-60° C. for 1-2 hours; particle preparation: heat-treated wood after pretreatment Drain the water, pulverize, and sieve to obtain shavings particles with a relatively uniform particle size; hot pressing: after the shaving particles are assembled, the slabs are placed on a press for hot pressing, and the hot pressing temperature is set to 150℃‑ 170℃, hot pressing time is 80‑100s/(mm thickness); post-processing: after hot pressing is completed, the pressure of the press is released to 0.05‑0.1MPa, that is, the pressing plate is about to be opened, and the hot pressing temperature is raised to 200‑220℃ for heat preservation 10min‑20min.
Description
Technical Field
The invention relates to the recycling of waste heat-treated wood, in particular to a method for preparing a non-adhesive shaving board (or called particle board) by using the waste heat-treated wood.
Background
Heat-treated wood has been widely used for various wood products indoors and outdoors since it was put into use in the market in about 2000 years due to its excellent product performance. After the use of the heat treatment material for about 20 years, a plurality of heat treatment material end products such as floors, furniture and various packaging materials enter the maintenance and old dismantling stages at present. How to efficiently utilize the waste heat-treated wood for reprocessing has important significance in improving the utilization rate of the wood and saving the resource cost, and even if the waste heat-treated wood is discarded again, the waste heat-treated wood can be continuously recycled through treatment, so that secondary pollution to the environment is avoided.
In terms of the form of recycling, if the shaving board (or called particle board) is prepared by using the waste heat-treated material on the premise of lower cost, compared with other products such as biomass granular fuel, the shaving board has better product competitiveness and technical popularization value. The shaving board is prepared by using waste heat-treated materials, and people can naturally think of a method of crushing the shaving board, adding adhesive, assembling and hot-pressing the shaving board. However, the use of the urea-formaldehyde resin adhesive has the problem of free formaldehyde release in the actual production and application processes, and the free formaldehyde release is a long-term, slow and repeated process, which brings great trouble to the control and treatment of the free formaldehyde. Currently, although aldehyde-free adhesives such as soy protein-based adhesives, starch-based adhesives, isocyanate-based adhesives, thermoplastic resin adhesives, lignin-based adhesives have also been developed in the wood industry, these aldehyde-free adhesives often suffer from problems such as high cost, poor performance, and complex processing.
Disclosure of Invention
The invention aims to provide a method for preparing a non-adhesive shaving board by using waste heat-treated wood, which does not add an adhesive, has simple and convenient preparation process and low cost, does not have the problems of secondary pollution such as formaldehyde release and the like, and has excellent mechanical property.
In order to achieve the purpose, the method for preparing the non-glue shaving board by using the waste heat-treated wood comprises the following steps:
a. pretreatment: placing the waste outdoor heat-treated wood in a potassium carbonate solution with the mass concentration of 2-5% and the temperature of 40-60 ℃ for treatment for 1-2 h;
b. preparing particles: draining water from the pretreated heat-treated wood, crushing and sieving to obtain shaving particles with uniform particle sizes;
c. assembling and hot pressing: after the wood shaving particles are assembled, placing the plate blank on a press for hot pressing, setting the hot pressing temperature to be 150-170 ℃ and the hot pressing time to be 80-100s/(mm thickness);
d. and (3) post-treatment: after the hot pressing is finished, the pressure of the press is released to 0.05-0.1MPa, namely the pressing plate is in an opening state, and the hot pressing temperature is raised to 200-220 ℃ and the temperature is preserved for 10-20 min.
As a further improvement, in the method for preparing the non-glue shaving board by using the waste heat-treated wood, in the step b, the mesh number of the shaving particles is 10-40 meshes.
The heat-treated wood is obtained by subjecting wood to a high-temperature heat treatment. In the high-temperature heat treatment process of the wood, three major cellulose, hemicellulose and lignin in the wood are degraded to different degrees respectively, the hemicellulose with poor thermal stability is degraded firstly, the water-absorbing hydroxyl is reduced, and the dimensional stability is improved; the cellulose part is degraded, the density is reduced, the mechanical property is reduced, the wood is easier to crush, and the crushing energy consumption is reduced; while the cellulose and hemicellulose contents are reduced, the relative content of lignin is increased and the corrosion resistance of the heat-treated material is improved. When the heat treatment temperature reaches 180 ℃, lignin with good heat stability is also partially degraded, the contents of carboxyl and phenols are increased, the contents of carbonyl and hydroxyl are reduced, and the macromolecular structure of the lignin is damaged.
When this patent utilized old and useless heat treatment timber to prepare the shaving board, adopted potassium carbonate solution to heat treatment timber preliminary treatment earlier. The lignin is an amorphous polymer, the softening temperature of the lignin is reduced along with the increase of the water content, and the softening temperature of the lignin is obviously reduced after the lignin absorbs water; when the temperature reaches the glass transition temperature, the molecular motion of the polymer is intensified, the surface area is increased, the surface adaptability is enhanced, and the interface gluing is more facilitated. On the other hand, the alkali carbonate has obvious ring-opening promotion effect, and can play a key role in softening and degrading heat-treated materials at high temperature, reducing the steric hindrance of lignin, increasing the reactivity of a degradation product furfural of hemicellulose and a depolymerization product monophenolic substance of lignin in the high-temperature hot-pressing process and promoting adhesive polymerization.
In the high-temperature heat treatment process of the heat-treated wood, due to the high-temperature hydrolysis, acidic substances such as acetic acid and the like are generated, so that the pH value of the heat-treated wood is low and is acidic. Therefore, the invention adopts potassium carbonate solution to pretreat the heat-treated wood. The potassium carbonate is the main component of the plant ash, the water pollution is small, the emission is moderate, the potassium element in the plant ash can promote the growth of plants, and the capability of resisting diseases and insects and natural disasters is enhanced to a certain extent, so the environmental protection pressure generated by the process method is small; after the heat-treated wood is pretreated by potassium carbonate, the pH value of the heat-treated wood is increased to be close to neutrality, so that the heat-treated wood is milder in degradation reaction under the subsequent hot-pressing high-temperature environment, and severe chemical reactions such as acidolysis, fiber swelling degradation and the like of the wood in acidic and alkaline environments cannot occur.
The main principle of the slab gluing and molding method is that the pretreatment of potassium carbonate promotes the pyrolysis and dehydration of hemicellulose under the action of high-temperature hot pressing to form furfural, and the furfural and phenolic substances in lignin degradation products undergo gluing and polymerization reaction.
In the invention, in order to make up for the contribution of an adhesive to raw material gluing during adhesive-free gluing, the slab needs to rely on larger hot-pressing pressure to make the wood shavings fully contacted and connected in the hot pressing process, so that in the micro-pressing post-treatment stage after the slab is subjected to hot pressing, on one hand, the higher temperature can further accelerate the molecular motion in the wood, the motion of molecular chain segments is excited, and the internal stress generated in the hot pressing process is released, and on the other hand, the recovery of slab deformation is inhibited by the intermolecular condensation and bridging of the wood under the action of high temperature, thereby being beneficial to fixing the compression deformation of the slab and preventing the slab from rebounding in the subsequent use environment. Therefore, the non-adhesive shaving board prepared by the invention can obtain excellent corrosion resistance and dimensional stability, and can meet the mechanical property requirement of a common shaving (particle) board.
Detailed Description
In view of the problems of wood resource shortage, high manufacturing cost of woodworking adhesives, serious pollution and the like in China, the invention provides a method for preparing a glue-free shaving (particle) board by using waste heat-treated wood.
Example 1:
firstly, waste outdoor heat-treated wood is placed in a potassium carbonate solution with the mass fraction of 2% and is kept at the constant temperature of 40 ℃ for 1h (the pretreatment stage), on one hand, the wood is cleaned, on the other hand, potassium carbonate can promote polysaccharide substances in the heat-treated wood to be further hydrolyzed, lignin is degraded to a certain extent, the steric hindrance of macromolecules of the lignin is reduced, the lignin is activated, and the reactivity of the lignin in the later high-temperature hot-pressing process is improved; then, draining water from the pretreated heat-treated wood, crushing and sieving to obtain wood shaving particles with uniform particle size (the mesh number is 10-40 meshes) (the particle preparation stage); then assembling the blank, setting the hot-pressing temperature to be 150 ℃, placing the blank on a press for hot pressing, wherein the hot-pressing time is 80s/(mm of the thickness of the blank) (the hot-pressing stage); after the hot pressing is finished, the pressure is released to 0.05Pa, namely the pressing plate is about to be opened, and the temperature is raised to 200 ℃ and kept for 10min (the post-treatment stage). The non-adhesive shaving board prepared by the method can obtain excellent corrosion resistance, mildew resistance and dimensional stability, and simultaneously can meet the mechanical property requirements of common shaving (particle) boards, and the related performance parameters are shown in table 1.
Example 2:
firstly, waste outdoor heat-treated wood is placed in a potassium carbonate solution with the mass fraction of 3% and is kept at the constant temperature of 40 ℃ for 2 hours (the pretreatment stage), on one hand, the wood is cleaned, on the other hand, potassium carbonate can promote polysaccharide substances in the heat-treated wood to be further hydrolyzed, lignin is degraded to a certain extent, the steric hindrance of macromolecules of the lignin is reduced, the lignin is activated, and the reactivity of the lignin in the later high-temperature hot-pressing process is improved; then, draining water from the pretreated heat-treated wood, crushing and sieving to obtain wood shaving particles with uniform particle size (the mesh number is 10-40 meshes) (the particle preparation stage); assembling the blank, setting the hot-pressing temperature to be 160 ℃, placing the blank on a press for hot pressing, wherein the hot-pressing time is 100s/(mm of the thickness of the blank) (the hot-pressing stage); after the hot pressing is finished, the pressure is released to 0.1MPa, namely the pressing plate is about to be opened, and the temperature is raised to 220 ℃ and kept for 10min (the post-treatment stage). The non-adhesive shaving board prepared by the method can obtain excellent corrosion resistance, mildew resistance and dimensional stability, and simultaneously can meet the mechanical property requirements of common shaving (particle) boards, and the related performance parameters are shown in table 1.
Example 3:
firstly, waste outdoor heat-treated wood is placed in a potassium carbonate solution with the mass fraction of 5% and is kept at the constant temperature of 60 ℃ for 1h (which is a pretreatment stage), on one hand, the wood is cleaned, on the other hand, potassium carbonate can promote polysaccharide substances in the heat-treated wood to be further hydrolyzed, lignin is degraded to a certain extent, the steric hindrance of macromolecules of the lignin is reduced, the lignin is activated, and the reactivity of the lignin in a later-stage high-temperature hot-pressing process is improved; then, draining water from the pretreated heat-treated wood, crushing and sieving to obtain wood shaving particles with uniform particle size (the mesh number is 10-40 meshes) (the particle preparation stage); assembling the blank, setting the hot-pressing temperature to be 170 ℃, placing the blank on a press for hot pressing, wherein the hot-pressing time is 80s/(mm of the thickness of the blank) (the hot-pressing stage); after the hot pressing is finished, the pressure is released to 0.05MPa, namely the pressing plate is about to be opened, and the temperature is raised to 220 ℃ and kept for 20min (the post-treatment stage). The non-adhesive shaving board prepared by the method can obtain excellent corrosion resistance, mildew resistance and dimensional stability, and simultaneously can meet the mechanical property requirements of common shaving (particle) boards, and the related performance parameters are shown in table 1.
Example 4:
firstly, waste outdoor heat-treated wood is placed in a potassium carbonate solution with the mass fraction of 4% and is kept at the constant temperature of 60 ℃ for 2 hours (which is a pretreatment stage), on one hand, the wood is cleaned, on the other hand, potassium carbonate can promote polysaccharide substances in the heat-treated wood to be further hydrolyzed, lignin is degraded to a certain extent, the steric hindrance of macromolecules of the lignin is reduced, the lignin is activated, and the reactivity of the lignin in a later-stage high-temperature hot-pressing process is improved; then, draining water from the pretreated heat-treated wood, crushing and sieving to obtain wood shaving particles with uniform particle size (the mesh number is 10-40 meshes) (the particle preparation stage); assembling the blank, setting the hot-pressing temperature to be 160 ℃, placing the blank on a press for hot pressing, wherein the hot-pressing time is 100s/(mm of the thickness of the blank) (the hot-pressing stage); after the hot pressing is finished, the pressure is released to 0.1MPa, namely the pressing plate is about to be opened, and the temperature is raised to 200 ℃ and kept for 20min (the post-treatment stage). The non-adhesive shaving board prepared by the method can obtain excellent corrosion resistance, mildew resistance and dimensional stability, and simultaneously can meet the mechanical property requirements of common shaving (particle) boards, and the related performance parameters are shown in table 1.
The static bending strength and the 2h water absorption thickness expansion rate of the particle board (the thickness is 10mm) are tested according to GB/T17657-:
| MOR(MPa) | 2h Water absorption thickness swelling Rate (%) | Mold growth coverage on the panel surface (%) | |
| Example 1 | 13.8 | 3.43 | 8 |
| Example 2 | 14.1 | 3.94 | 10 |
| Example 3 | 15.3 | 3.17 | 8 |
| Example 4 | 14.5 | 4.25 | 12 |
Claims (1)
1. A method for preparing a non-adhesive shaving board by using waste heat-treated wood is characterized by comprising the following steps: the method comprises the following steps:
a. pretreatment: placing the waste outdoor heat-treated wood in a potassium carbonate solution with the mass concentration of 2-5% and the temperature of 40-60 ℃ for treatment for 1-2 h;
b. preparing particles: draining water from the pretreated heat-treated wood, crushing and sieving to obtain shaving particles with uniform particle size, wherein the mesh number of the shaving particles is 10-40 meshes;
c. assembling and hot pressing: after the wood shaving particles are assembled, placing the plate blank on a press for hot pressing, setting the hot pressing temperature to be 150-170 ℃ and the hot pressing time to be 80-100s/(mm thickness);
d. and (3) post-treatment: after the hot pressing is finished, the pressure of the press is released to 0.05-0.1MPa, namely the pressing plate is in an opening state, and the hot pressing temperature is raised to 200-220 ℃ and the temperature is preserved for 10-20 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010634031.8A CN111745771B (en) | 2020-07-04 | 2020-07-04 | A method for preparing glue-free particleboard from waste heat-treated wood |
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| CN202010634031.8A CN111745771B (en) | 2020-07-04 | 2020-07-04 | A method for preparing glue-free particleboard from waste heat-treated wood |
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| CN111745771B true CN111745771B (en) | 2021-10-08 |
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| JP7093138B1 (en) * | 2021-12-07 | 2022-06-29 | 株式会社パームホルツ | Wood board |
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| CN101670608A (en) * | 2008-09-08 | 2010-03-17 | 富朗投资管理集团(香港)有限公司 | Hot pressing process for manufacturing board by utilizing crop straws |
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| CN104136179A (en) * | 2011-12-23 | 2014-11-05 | 巴斯夫欧洲公司 | Lignocellulosic materials with lignocellulosic fibers in the outer layers and expanded plastics particles present in the core, and process and use thereof |
| CN107984590A (en) * | 2017-11-21 | 2018-05-04 | 常州市奥普泰科光电有限公司 | A kind of preparation method of biomass without offset plate |
| CN110039633A (en) * | 2019-06-02 | 2019-07-23 | 南京林业大学 | The preparation method of recombining bamboo |
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| CN101670608A (en) * | 2008-09-08 | 2010-03-17 | 富朗投资管理集团(香港)有限公司 | Hot pressing process for manufacturing board by utilizing crop straws |
| CN104136179A (en) * | 2011-12-23 | 2014-11-05 | 巴斯夫欧洲公司 | Lignocellulosic materials with lignocellulosic fibers in the outer layers and expanded plastics particles present in the core, and process and use thereof |
| CN103029196A (en) * | 2012-12-13 | 2013-04-10 | 宁波大世界家具研发有限公司 | Method for manufacturing rubber-free high-density fiberboard |
| CN103878858A (en) * | 2014-03-04 | 2014-06-25 | 中国科学院宁波材料技术与工程研究所 | Method for manufacturing formaldehyde-free bamboo and wood fiberboard |
| CN107984590A (en) * | 2017-11-21 | 2018-05-04 | 常州市奥普泰科光电有限公司 | A kind of preparation method of biomass without offset plate |
| CN110039633A (en) * | 2019-06-02 | 2019-07-23 | 南京林业大学 | The preparation method of recombining bamboo |
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