CN117047886B - Method for preparing non-adhesive fiber board through microwave hot pressing - Google Patents
Method for preparing non-adhesive fiber board through microwave hot pressing Download PDFInfo
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- CN117047886B CN117047886B CN202310907051.1A CN202310907051A CN117047886B CN 117047886 B CN117047886 B CN 117047886B CN 202310907051 A CN202310907051 A CN 202310907051A CN 117047886 B CN117047886 B CN 117047886B
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- 239000000853 adhesive Substances 0.000 title claims abstract description 73
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 73
- 239000011094 fiberboard Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007731 hot pressing Methods 0.000 title claims abstract description 24
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229920002522 Wood fibre Polymers 0.000 claims abstract description 46
- 239000002025 wood fiber Substances 0.000 claims abstract description 46
- 229920005610 lignin Polymers 0.000 claims abstract description 43
- 238000003756 stirring Methods 0.000 claims abstract description 42
- 238000002156 mixing Methods 0.000 claims abstract description 37
- 108010029541 Laccase Proteins 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 22
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920001661 Chitosan Polymers 0.000 claims abstract description 15
- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 claims abstract description 15
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000001291 vacuum drying Methods 0.000 claims abstract description 3
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 44
- 239000011259 mixed solution Substances 0.000 claims description 28
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 16
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 8
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 8
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 claims description 7
- 229910000342 sodium bisulfate Inorganic materials 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 238000010025 steaming Methods 0.000 claims description 6
- 244000166124 Eucalyptus globulus Species 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 5
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 4
- 241000018646 Pinus brutia Species 0.000 claims description 4
- 235000011613 Pinus brutia Nutrition 0.000 claims description 4
- 229920005611 kraft lignin Polymers 0.000 claims description 3
- 238000000855 fermentation Methods 0.000 claims description 2
- 230000004151 fermentation Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 6
- 238000005457 optimization Methods 0.000 abstract description 2
- 239000003999 initiator Substances 0.000 abstract 1
- 239000000017 hydrogel Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- 229920002125 Sokalan® Polymers 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 3
- 150000001720 carbohydrates Chemical class 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000004584 polyacrylic acid Substances 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 229920002488 Hemicellulose Polymers 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 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 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 108010031396 Catechol oxidase Proteins 0.000 description 1
- 102000030523 Catechol oxidase Human genes 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 231100000481 chemical toxicant Toxicity 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- -1 melamine modified urea-formaldehyde resin Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
-
- 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
- B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
-
- 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
- B27N3/12—Moulding of mats from fibres
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J197/00—Adhesives based on lignin-containing materials
- C09J197/005—Lignin
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a method for preparing a non-adhesive fiber board by microwave hot pressing, which comprises the steps of adding acrylic acid, methylene bisacrylamide, an initiator and the like into water for mixing reaction, adding isopropyl acrylamide and chitosan for mixing reaction, and then vacuum drying to obtain xerogel; adding xerogel into water, adding ammonia water to adjust pH, adding laccase, stirring and mixing, adding lignin, stirring and mixing uniformly, and reacting at 60-70 ℃ to obtain an adhesive; adding citric acid solution into the adhesive to adjust the pH, soaking wood fibers in the citric acid solution, mixing the wood fibers with the adhesive, stirring, and paving to obtain a plate blank; and placing the plate blank into microwave equipment for microwave heating, and then forming by a pressing plate to obtain the shaving board. According to the invention, laccase is utilized to catalyze lignin to prepare the formaldehyde-free environment-friendly adhesive, and the microwave hot-pressing process is subjected to targeted optimization adjustment, so that the high-quality fiberboard with good mechanical properties is produced.
Description
Technical Field
The invention belongs to the technical field of fiber board production, and particularly relates to a method for preparing an adhesive-free fiber board by microwave hot pressing.
Background
The fiber board is also called as a density board, and is an artificial board made of wood fiber or other plant fiber as raw material and urea-formaldehyde resin or other applicable adhesive. The adhesive and/or additives may be applied during the manufacturing process. The fiber board has the advantages of uniform material, small longitudinal and transverse strength difference, difficult cracking and the like, and has wide application. In the manufacturing process of the fiber board, a plurality of factors influencing the quality of the product are included, and the factors mainly include the quality of the adhesive, the sizing amount, the hot pressing process and the like. The whole plate blank is heated, heat is transferred from the surface of the plate blank to the inside, so that the temperature inside and outside the plate blank reaches the curing temperature of the adhesive, and the adhesive is cured and formed. Because the composition ratio and the curing conditions of different adhesives are very different, the requirements on the hot pressing process conditions are different, and particularly when microwave hot pressing is adopted, the curing effects of the different adhesives under the action of microwaves are different, and how to optimize the hot pressing process conditions for the different adhesives so as to produce and obtain the high-quality fiberboard is one of the key points of the current research.
Meanwhile, as people strengthen safety awareness and environmental protection awareness, formaldehyde gas harmful to the environment and human health can be released in the production and use process of the trialdehyde resin adhesive such as urea-formaldehyde resin adhesive, phenolic resin adhesive, melamine modified urea-formaldehyde resin adhesive and the like, and research and development of formaldehyde-free adhesives are one of hot spots in fiberboard production. Laccase (Laccases, lac) is a lignin-degrading polyphenol oxidase that catalyzes the lignin to produce phenoxy radicals, and the further crosslinking reaction between the radicals produces a complex carbohydrate complex that binds lignin, cellulose and hemicellulose together to achieve gluing. Therefore, the preparation of the adhesive by using laccase to catalyze and oxidize lignin is a good substitute scheme of the trialdehyde resin adhesive, toxic chemical raw materials such as formaldehyde and the like are not required to be added in the production process, the problem of releasing toxic gas and harmful substances does not exist in use, and the development and application potential is huge.
Disclosure of Invention
Aiming at the defects in the production of the fiber board at present, the invention discloses a method for preparing an adhesive-free fiber board by microwave hot pressing, which utilizes laccase to catalyze lignin to prepare an aldehyde-free environment-friendly adhesive, and performs targeted optimization adjustment on a microwave hot pressing process, so that the high-quality fiber board with good mechanical properties is produced, and the lignin, straw, wood powder and other waste biomasses are recycled and utilized with high values.
The invention is realized by adopting the following technical scheme:
a method for preparing a non-adhesive fiber board by microwave hot pressing comprises the following steps:
(1) Sequentially adding acrylic acid, methylene bisacrylamide, ammonium persulfate and sodium bisulphite into water, stirring and mixing to obtain a mixed solution A, then placing the mixed solution A into a water bath at a temperature of 30-40 ℃ for reaction for 8-12 hours, sequentially adding isopropyl acrylamide and chitosan, stirring and mixing to obtain a mixed solution B, dropwise adding ammonium persulfate into the mixed solution B, stirring and reacting for 12-24 hours under the water bath at the temperature of 30-40 ℃, and then vacuum drying to obtain xerogel; the mass ratio of the acrylic acid to the methylene bisacrylamide to the sodium bisulphite to the isopropyl acrylamide to the chitosan to the water is (3-5): 0.2-0.5): 0.02-0.05): 2-5): 1-3): 100; the mass ratio of the total dosage of the ammonium persulfate to the acrylic acid is (0.05-0.08) to (3-5);
(2) Adding the xerogel obtained in the step (1) into water, adding ammonia water to adjust the pH to 7.0-8.0, adding laccase, stirring and mixing for 20-30 min, adding lignin, stirring and mixing uniformly, and reacting at 60-70 ℃ for 8-16 h to obtain the adhesive; the mass ratio of the xerogel to the laccase to the lignin to the water is (5-10): 1-3): 20-30): 100;
(3) Adding citric acid solution into the adhesive in the step (2) to adjust the pH value to 4.0-5.0, soaking wood fibers in the citric acid solution for 3-5 min, mixing the wood fibers with the adhesive, and stirring the adhesive, wherein the mass ratio of the wood fibers to the adhesive is 10 (1-3), drying the wood fibers after the glue stirring until the water content is 8-10%, and paving to obtain a plate blank;
(4) Preheating the plate blank obtained in the step (3) at 50-60 ℃ for 3-5min, then placing the plate blank in microwave equipment for microwave heating, wherein the heating power density is 2-5W/g.m 3, the heating time is 30-60 s, and performing pressing plate molding on the plate blank subjected to microwave heating to obtain the fiber plate.
Further, in the step (2), the lignin is one or more of alkali lignin, acetic acid lignin, kraft lignin, fermentation residue lignin and papermaking black liquor lignin.
In the step (3), the wood fiber is obtained by taking one or two of eucalyptus and pine, chipping, crushing, steaming, softening, hot grinding and drying.
In the step (1), acrylic acid, methylene bisacrylamide, ammonium persulfate and sodium bisulfate are sequentially added into water and stirred and mixed at the speed of 300-500 r/min to obtain a mixed solution A; ammonium persulfate is added into the mixed solution B in a dropwise manner, and then stirred and reacted for 12 to 24 hours under the conditions of water bath at the temperature of 30 to 40 ℃ and the speed of 50 to 80 r/min. When the mixed solution A is prepared, the higher stirring speed is controlled, so that the components such as the acrylic acid, the methylene bisacrylamide, the ammonium persulfate, the sodium bisulphite and the like are uniformly mixed; when the mixed solution B is heated for reaction, the lower stirring speed is controlled, so that the cross-linking reaction of polyacrylic acid, isopropyl acrylamide and chitosan is facilitated, and the gel is prepared.
Further, in the step (3), the mass fraction of the citric acid solution is 8-10%.
In the step (3), the wood fiber after glue mixing is dried at the temperature of 60-80 ℃ until the water content is 8-10%.
Further, in the step (4), the frequency of the microwaves is 800-3000 MHz.
Compared with the prior art, the technical scheme has the following beneficial effects:
1. According to the invention, acrylic acid is adopted to react under the action of methylene bisacrylamide, ammonium persulfate, sodium bisulfate and the like to obtain polyacrylic acid, the polyacrylic acid is subjected to crosslinking reaction with isopropyl acrylamide and chitosan to obtain hydrogel with corresponding pH performance, and the swelling rate of the hydrogel under alkaline conditions is obviously higher than that of the hydrogel under acidic conditions, so that the hydrogel is mixed with laccase, ammonia water is added to adjust the pH to 7.0-8.0, the hydrogel has a very high swelling rate, laccase and laccase can be effectively adsorbed and fixed, the stability and heat resistance of laccase are improved, lignin is then added to react under the conditions of laccase and 60-70 ℃ to generate phenoxy free radicals, and further crosslinking reaction between the free radicals is carried out to generate a complex saccharide complex, and the complex can be used as an adhesive to bond lignin, cellulose and hemicellulose together, so that gluing is realized. Compared with water, the hydrogel can better promote the dispersion of lignin and improve the contact between the lignin and laccase, so that the reaction efficiency is improved, and the adhesive with good gluing performance is obtained.
2. According to the invention, before the obtained adhesive is mixed with the wood fiber, the pH of the adhesive is regulated to 4.0-5.0 by adopting a citric acid solution, the swelling rate of the hydrogel is greatly reduced under an acidic condition, a crosslinked net structure is formed, the adhesion of the adhesive and the wood fiber is facilitated, meanwhile, the citric acid solution is used for soaking the wood fiber, the surface of the wood fiber is treated, the interaction of the wood fiber and a saccharide complex in the adhesive is facilitated, the internal stress of the combination of the wood fiber and the adhesive is improved, the cracking phenomenon of a fiberboard is prevented, and the mechanical property of the fiberboard can be improved by uniformly dispersing the hydrogel and a small amount of unreacted lignin in the fiberboard.
3. The method adopts the microwave hot-pressing method, and according to the characteristics of the adhesive, the board blank is preheated firstly, and then the microwave hot-pressing is carried out, so that the uniform and rapid heating of the board blank is facilitated, the temperature difference of each part of the board blank is small, the adhesive is heated uniformly, the curing effect is good, and the produced fiber board has better mechanical properties.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to be limiting. The specific experimental conditions and methods not specified in the following examples are generally conventional means well known to those skilled in the art.
Example 1: a method for preparing a non-adhesive fiber board by microwave hot pressing comprises the following steps:
(1) Sequentially adding acrylic acid, methylene bisacrylamide, ammonium persulfate and sodium bisulfate into water, stirring and mixing at the speed of 400r/min to obtain a mixed solution A, then placing the mixed solution A into a water bath at the temperature of 35 ℃ for reaction for 10 hours, sequentially adding isopropyl acrylamide and chitosan, stirring and mixing to obtain a mixed solution B, dropwise adding ammonium persulfate into the mixed solution B, stirring and reacting at the speed of 60r/min in a water bath at the temperature of 35 ℃ for 16 hours, and then drying in vacuum to obtain xerogel; the mass ratio of the acrylic acid to the methylene bisacrylamide to the sodium bisulphite to the isopropyl acrylamide to the chitosan to the water is 4:0.3:0.04:3:2:100; the mass ratio of the total dosage of the ammonium persulfate to the acrylic acid is 0.06:4; (2) Adding the xerogel obtained in the step (1) into water, adding ammonia water to adjust the pH to 7.5, adding laccase, stirring and mixing for 25min, adding lignin, stirring and mixing uniformly, and reacting at 65 ℃ for 10h to obtain an adhesive; the mass ratio of the xerogel to the laccase to the lignin to the water is 6.5:2:25:100; the lignin is alkali lignin;
(3) Adding citric acid solution into the adhesive in the step (2) to adjust the pH to 4.3, soaking wood fibers in the citric acid solution for 4min, mixing the wood fibers with the adhesive, stirring the wood fibers and the adhesive, wherein the mass ratio of the wood fibers to the adhesive is 10:2, drying the glued wood fibers at 70 ℃ until the water content is 9%, and paving to obtain a plate blank; the mass fraction of the citric acid solution is 9%; the wood fiber is obtained by taking eucalyptus through chipping, crushing, steaming, softening, hot grinding and drying;
(4) Preheating the plate blank obtained in the step (3) for 4min at 55 ℃, then placing the plate blank in microwave equipment for microwave heating, wherein the heating power density is 3W/g.m 3, the heating time is 45s, the frequency of the microwave is 2450MHz, and performing pressing plate molding on the plate blank subjected to microwave heating to obtain the fiber plate.
Example 2: a method for preparing a non-adhesive fiber board by microwave hot pressing comprises the following steps:
(1) Sequentially adding acrylic acid, methylene bisacrylamide, ammonium persulfate and sodium bisulfate into water, stirring and mixing at a speed of 300r/min to obtain a mixed solution A, then placing the mixed solution A into a water bath at a temperature of 30 ℃ for reaction for 8 hours, sequentially adding isopropyl acrylamide and chitosan, stirring and mixing to obtain a mixed solution B, dropwise adding ammonium persulfate into the mixed solution B, stirring and reacting at a water bath at a temperature of 30 ℃ and a speed of 50r/min for 12 hours, and then drying in vacuum to obtain xerogel; the mass ratio of the acrylic acid to the methylene bisacrylamide to the sodium bisulphite to the isopropyl acrylamide to the chitosan to the water is 3:0.2:0.02:2:1:100; the mass ratio of the total dosage of the ammonium persulfate to the acrylic acid is 0.05:3;
(2) Adding the xerogel obtained in the step (1) into water, adding ammonia water to adjust the pH to 7.0, adding laccase, stirring and mixing for 20min, adding lignin, stirring and mixing uniformly, and reacting at 60 ℃ for 8h to obtain an adhesive; the mass ratio of the xerogel to the laccase to the lignin to the water is 5:1:20:100; the lignin is kraft lignin;
(3) Adding citric acid solution into the adhesive in the step (2) to adjust the pH to 4.0, soaking wood fibers in the citric acid solution for 3min, mixing the wood fibers with the adhesive, stirring the wood fibers and the adhesive, wherein the mass ratio of the wood fibers to the adhesive is 10:1, drying the glued wood fibers at 60 ℃ until the water content is 8%, and paving to obtain a plate blank; the mass fraction of the citric acid solution is 8%; the wood fiber is obtained by taking eucalyptus and pine, chipping, crushing, steaming, softening, hot grinding and drying;
(4) Preheating the plate blank obtained in the step (3) for 3min at 50 ℃, then placing the plate blank in microwave equipment for microwave heating, wherein the heating power density is 2W/g.m 3, the heating time is 30s, the frequency of the microwave is 800MHz, and performing pressing plate molding on the plate blank heated by the microwave to obtain the fiber plate.
Example 3: a method for preparing a non-adhesive fiber board by microwave hot pressing comprises the following steps:
(1) Sequentially adding acrylic acid, methylene bisacrylamide, ammonium persulfate and sodium bisulfate into water, stirring and mixing at the speed of 350r/min to obtain a mixed solution A, then placing the mixed solution A into a water bath at the temperature of 38 ℃ for reaction for 10 hours, sequentially adding isopropyl acrylamide and chitosan, stirring and mixing to obtain a mixed solution B, dropwise adding ammonium persulfate into the mixed solution B, stirring and reacting at the speed of 70r/min in a water bath at the temperature of 32 ℃ for 18 hours, and then drying in vacuum to obtain xerogel; the mass ratio of the acrylic acid to the methylene bisacrylamide to the sodium bisulphite to the isopropyl acrylamide to the chitosan to the water is 4:0.4:0.04:4.5:2.5:100; the mass ratio of the total dosage of the ammonium persulfate to the acrylic acid is 0.07:3.5;
(2) Adding the xerogel obtained in the step (1) into water, adding ammonia water to adjust the pH to 7.5, adding laccase, stirring and mixing for 25min, adding lignin, stirring and mixing uniformly, and reacting at 68 ℃ for 10h to obtain an adhesive; the mass ratio of the xerogel to the laccase to the lignin to the water is 8:2:25:100; the lignin is alkali lignin;
(3) Adding citric acid solution into the adhesive in the step (2) to adjust the pH to 4.5, soaking wood fibers in the citric acid solution for 4min, mixing the wood fibers with the adhesive, stirring the wood fibers and the adhesive, wherein the mass ratio of the wood fibers to the adhesive is 10:2.5, drying the glued wood fibers at 75 ℃ until the water content is 9%, and paving to obtain a plate blank; the mass fraction of the citric acid solution is 8.5%; the wood fiber is obtained by taking pine wood, chipping, crushing, steaming, softening, hot grinding and drying;
(4) Preheating the plate blank obtained in the step (3) for 4min at 56 ℃, then placing the plate blank in microwave equipment for microwave heating, wherein the heating power density is 4W/g.m 3, the heating time is50 s, the frequency of the microwave is 915MHz, and performing pressing plate molding on the plate blank heated by the microwave to obtain the fiber plate.
Example 4: a method for preparing a non-adhesive fiber board by microwave hot pressing comprises the following steps:
(1) Sequentially adding acrylic acid, methylene bisacrylamide, ammonium persulfate and sodium bisulfate into water, stirring and mixing at a speed of 500r/min to obtain a mixed solution A, then placing the mixed solution A into a water bath at a temperature of 40 ℃ for reaction for 12 hours, sequentially adding isopropyl acrylamide and chitosan, stirring and mixing to obtain a mixed solution B, dropwise adding ammonium persulfate into the mixed solution B, stirring and reacting at a water bath at a temperature of 40 ℃ and a speed of 80r/min for 24 hours, and then drying in vacuum to obtain xerogel; the mass ratio of the acrylic acid to the methylene bisacrylamide to the sodium bisulphite to the isopropyl acrylamide to the chitosan to the water is 5:0.5:0.05:5:3:100; the mass ratio of the total dosage of the ammonium persulfate to the acrylic acid is 0.08:5;
(2) Adding the xerogel obtained in the step (1) into water, adding ammonia water to adjust the pH to 8.0, adding laccase, stirring and mixing for 30min, adding lignin, stirring and mixing uniformly, and reacting at 70 ℃ for 16h to obtain an adhesive; the mass ratio of the xerogel to the laccase to the lignin to the water is 10:3:30:100; the lignin is alkali lignin and papermaking black liquor lignin;
(3) Adding citric acid solution into the adhesive in the step (2) to adjust the pH to 5.0, soaking wood fibers in the citric acid solution for 5min, mixing the wood fibers with the adhesive, stirring the wood fibers and the adhesive, wherein the mass ratio of the wood fibers to the adhesive is 10:3, drying the glued wood fibers at 80 ℃ until the water content is 10%, and paving to obtain a plate blank; the mass fraction of the citric acid solution is 10%; the wood fiber is obtained by taking eucalyptus through chipping, crushing, steaming, softening, hot grinding and drying;
(4) Preheating the plate blank obtained in the step (3) for 5min at 60 ℃, then placing the plate blank in microwave equipment for microwave heating, wherein the heating power density is 5W/g.m 3, the heating time is 60s, the frequency of the microwave is 3000MHz, and performing pressing plate molding on the plate blank heated by the microwave to obtain the fiber plate.
Comparative example 1: the method for preparing the non-adhesive fiber board by microwave hot pressing in the comparative example is different from the method in the embodiment 1 only in that the step (1) is omitted, xerogel is not used in the step (2), laccase is directly added into water to adjust the pH value, and lignin is added to be uniformly stirred and mixed.
Comparative example 2: the method for preparing the non-adhesive fiber board by microwave hot pressing according to the comparative example is different from the method described in the embodiment 1 only in that in the step (3), the wood fiber is not soaked in the citric acid solution, but the wood fiber is directly mixed with the adhesive for glue mixing.
Experimental example: the fiber boards were prepared according to the methods described in examples 1 to 4 and comparative examples 1 to 2, and then the obtained fiber boards were subjected to performance test according to the national standard of density fiber boards in GB/T11718-2021, and specific results are shown in Table 1.
TABLE 1 results of performance measurements on fiberboard
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. A method for preparing a non-adhesive fiber board by microwave hot pressing is characterized in that: the method comprises the following steps:
(1) Sequentially adding acrylic acid, methylene bisacrylamide, ammonium persulfate and sodium bisulfate into water, stirring and mixing at the speed of 300-500 r/min to obtain a mixed solution A, then placing the mixed solution A into a water bath at the temperature of 30-40 ℃ for reaction for 8-12 h, sequentially adding isopropylacrylamide and chitosan, stirring and mixing to obtain a mixed solution B, dropwise adding ammonium persulfate into the mixed solution B, stirring and reacting for 12-24 h at the speed of 50-80 r/min in a water bath at the temperature of 30-40 ℃, and then vacuum drying to obtain xerogel; the mass ratio of the acrylic acid to the methylene bisacrylamide to the sodium bisulphite to the isopropyl acrylamide to the chitosan to the water is (3-5): 0.2-0.5): 0.02-0.05): 2-5): 1-3): 100; the mass ratio of the total dosage of the ammonium persulfate to the acrylic acid is (0.05-0.08) to (3-5);
(2) Adding the xerogel obtained in the step (1) into water, adding ammonia water to adjust the pH to 7.0-8.0, adding laccase, stirring and mixing for 20-30 min, adding lignin, stirring and mixing uniformly, and reacting at 60-70 ℃ for 8-16 h to obtain the adhesive; the mass ratio of the xerogel to the laccase to the lignin to the water is (5-10): 1-3): 20-30): 100;
(3) Adding citric acid solution into the adhesive in the step (2) to adjust the pH value to 4.0-5.0, soaking wood fibers in the citric acid solution for 3-5 min, mixing the wood fibers with the adhesive, stirring the mixture, wherein the mass ratio of the wood fibers to the adhesive is 10 (1-3), drying the mixed wood fibers at 60-80 ℃ until the water content is 8-10%, and paving to obtain a plate blank; the mass fraction of the citric acid solution is 8-10%;
(4) Preheating the plate blank obtained in the step (3) at 50-60 ℃ for 3-5min, then placing the plate blank in microwave equipment for microwave heating, wherein the heating power density is 2-5W/g.m 3, the heating time is 30-60 s, and performing pressing plate molding on the plate blank subjected to microwave heating to obtain the fiber plate.
2. The method for preparing the non-adhesive fiber board by microwave hot pressing according to claim 1, wherein the method comprises the following steps: in the step (2), the lignin is one or more of alkali lignin, acetic acid lignin, kraft lignin, fermentation residue lignin and papermaking black liquor lignin.
3. The method for preparing the non-adhesive fiber board by microwave hot pressing according to claim 1, wherein the method comprises the following steps: in the step (3), the wood fiber is obtained by taking one or two of eucalyptus and pine, chipping, crushing, steaming, softening, hot grinding and drying.
4. The method for preparing the non-adhesive fiber board by microwave hot pressing according to claim 1, wherein the method comprises the following steps: in the step (4), the frequency of the microwaves is 800-3000 MHz.
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