Green shaving board based on environment-friendly adhesive and production process of green shaving board

Abstract

The invention relates to the technical field of shaving boards, and particularly discloses an environment-friendly shaving board based on an environment-friendly adhesive and a production process of the environment-friendly shaving board. The shaving board comprises shaving raw materials and adhesive slurry, a modified macromolecular flame-retardant substance, an antibacterial substance and a diluent are used as additives to be jointly mixed to form the flame-retardant adhesive, the modified macromolecular flame-retardant substance contains a high-temperature-resistant structure and nitrogen and phosphorus elements, efficient flame retardance is achieved through the synergistic effect, the flame-retardant grade and thermal stability of the shaving board can be remarkably improved by adding the modified macromolecular flame-retardant substance into the adhesive and applying the adhesive to the shaving board, and the flame-retardant effect is good. The antibacterial substance comprises chitosan and piperazine structures, the antibacterial effect is stable and lasting through the synergistic effect of the chitosan and the piperazine structures, the shaving board is endowed with good antibacterial and mildew-proof performance, bamboo scrap leftover materials or waste wood are adopted as the shaving raw materials, the production process is clean, and the green and sustainable development concept is met.

Description

Technical Field

[0001] This invention relates to the field of particleboard technology, and more specifically to a green particleboard based on an environmentally friendly adhesive. Background Technology

[0002] In the fields of construction and furniture manufacturing, particleboard has been widely used due to its wide availability of raw materials, low production costs, and good processing performance. However, as people's requirements for product performance and environmental protection continue to increase, the many shortcomings of traditional particleboard are becoming increasingly apparent. Traditional particleboard is primarily composed of wood shavings, and wood is a flammable material with poor combustion properties, easily igniting upon contact with an open flame. In locations with high fire safety requirements, such as high-rise buildings, public spaces, and the interiors of vehicles, the application of traditional particleboard is strictly limited and cannot meet relevant fire safety standards. Furthermore, the porous structure of particleboard, coupled with its tendency to absorb moisture from the air during production and use, provides a suitable environment for the growth of bacteria and mold. The proliferation of bacteria and mold not only leads to mildew on the particleboard, affecting its appearance and lifespan, but also releases harmful microbial spores and volatile organic compounds, polluting indoor air quality and thus endangering human health. The antibacterial and anti-mold issues of traditional particleboard are particularly pronounced in humid environments such as bathrooms, kitchens, and basements. Furthermore, the adhesives used in traditional particleboard production are mostly urea-formaldehyde resin adhesives, which release harmful gases such as formaldehyde during production and use. Formaldehyde is a recognized carcinogen, and long-term exposure can cause serious damage to the human respiratory and nervous systems, which does not meet the requirements of modern society for environmental protection and health. Therefore, developing a green particleboard based on environmentally friendly adhesives, while endowing it with good flame retardant, antibacterial and mildew-proof properties, can not only solve the above-mentioned problems of traditional particleboard and expand its application range, but also conform to the development trend of environmental protection and health, which has important practical significance and market value. Summary of the Invention

[0003] The purpose of this invention is to provide a green particleboard based on an environmentally friendly adhesive and its production process.

[0004] The objective of this invention can be achieved through the following technical solutions: A production process for green particleboard based on environmentally friendly adhesives includes the following steps: Step 1: Peel, sieve, and remove impurities from the raw wood shavings. Then, put them into a pulverizer and crush them into granules. Process them into wood shavings with a length of 120-130mm, a width of 30-40mm, and a thickness of 0.4-0.6mm. Then, dry them to obtain raw wood shavings with a moisture content of 5-6% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55-65℃, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 6-8% of the weight of the wood shavings to obtain a mixture. Step 3: The mixture is laid out to form a slab, and pre-pressed for 5-7 minutes on a flat vulcanizing machine at a temperature of 80-85℃ and a pressure of 1-1.5MPa. Then, the temperature of the flat vulcanizing machine is set to 100-130℃ and the pressure is 2-3MPa, and hot-pressed for 30-45 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 80-100℃ and a pressure of 2.5-3MPa for 5-7 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

[0005] Furthermore, the raw material for the wood shavings is bamboo scraps or waste wood.

[0006] Furthermore, the particleboard includes particleboard raw materials and adhesive slurry; the adhesive slurry is made from the following raw materials measured in parts by weight: 80-100 parts epoxy resin, 55-60 parts acrylic resin, 20-30 parts modified macromolecular flame retardant, 10-15 parts antibacterial agent, 5-10 parts diluent, 0.5-1 part leveling agent, and 10-12 parts curing agent.

[0007] Furthermore, the preparation method of the modified macromolecular flame retardant includes the following steps: A1: Under nitrogen protection, benzene as a solvent, eugenol, 2-vinylpyridine, and azobisisobutyronitrile were added to the reactor while stirring. The temperature of the reaction solution was then raised to 60-65℃ and the reaction was carried out for 16-18 hours. After the reaction was completed, the product was purified and dried under vacuum to obtain the intermediate. A2: Under nitrogen protection, add phenylphosphodichloride and anhydrous acetonitrile as solvent to the reactor, stir evenly, raise the temperature to 70-80℃, add intermediate and triethylamine, and react for 8-9 hours. After the reaction is completed, purify the reaction solution and vacuum dry the product to obtain the modified macromolecular flame retardant.

[0008] Through the above technical solution, the allyl double bond in eugenol and the vinyl group in the 2-vinylpyridine structure undergo a free radical copolymerization reaction initiated by azobisisobutyronitrile to generate an intermediate. Under the action of triethylamine, the phenolic hydroxyl group in the intermediate structure undergoes a substitution reaction with the chlorine atom in the phenylphosphodichloro structure to prepare a modified macromolecular flame retardant.

[0009] Furthermore, the method for preparing the antibacterial agent includes the following steps: H1: Add dried chitosan to the reactor, evacuate the reactor, then introduce nitrogen for protection, add N,N-dimethylacetamide solvent, raise the temperature to 80-85℃, and dissolve the chitosan by magnetic stirring to obtain a chitosan solution. H2: Add 4,4-diisocyanate dicyclohexylmethane and dibutyltin dilaurate to N,N-dimethylacetamide solvent and stir until homogeneous to obtain an additive solution. Add the additive solution to chitosan solution and set the temperature to 80-85℃. React for 8-8.5 h. Then add 1,4-bis(3-aminopropyl)piperazine and keep the reaction at the specified temperature. After the reaction is complete, remove the insoluble matter and solvent to obtain the antibacterial substance.

[0010] Furthermore, the heat preservation reaction time in step H2 is 1.5-2 hours.

[0011] Using the above technical solution, under the catalysis of dibutyltin dilaurate, the amino group in the chitosan structure reacts with the isocyanate group in the 4,4-diisocyanate dicyclohexylmethane structure to generate a prepolymer linked by urea bonds. The isocyanate group at the end of the prepolymer then reacts with the amino group in the 1,4-bis(3-aminopropyl)piperazine structure to introduce a piperazine ring structure, and finally an antibacterial agent is prepared.

[0012] Further, the diluent is phenyl glycidyl ether or ethylene glycol diglycidyl ether; the leveling agent is an acrylate leveling agent or an organosilicon leveling agent; and the curing agent is an amine or an anhydride.

[0013] Furthermore, the preparation method of the adhesive slurry is specifically as follows: Add the modified macromolecular flame retardant, antibacterial agent, diluent, and leveling agent to the mixer and stir for 30-45 minutes. Then add epoxy resin and acrylic resin and stir for 2-3 hours. Finally, add the curing agent and cure to obtain the adhesive slurry.

[0014] Furthermore, the stirring speed is 300-500 r / min.

[0015] Furthermore, a green particleboard based on an environmentally friendly adhesive is produced using the above-mentioned production process.

[0016] The beneficial effects of this invention are: (1) The particleboard of the present invention is made by encapsulating the particles of the particleboard raw material in an adhesive slurry, and then laying, hot pressing and setting. The particleboard prepared not only has a high flame retardant rating and thermal stability, which can better delay the combustion process to ensure safety, but also has good antibacterial and anti-mildew properties, which can effectively inhibit the growth of bacteria and mold, extend the service life of the board and maintain environmental hygiene. In addition, in terms of environmental protection, the particleboard raw material uses bamboo scraps and waste wood to achieve waste recycling and reuse. The production process is clean and has little pollution. The board will not release harmful substances during use, which is in line with the concept of green environmental protection and is conducive to sustainable development.

[0017] (2) The modified macromolecular flame retardant prepared by the present invention contains high-temperature resistant structures such as benzene rings, pyridine structures, and phosphate esters. During combustion, the nitrogen element decomposes to produce inert gas to block air, and the phosphorus element decomposes to produce acidic substances such as phosphoric acid and polyphosphoric acid, which cover the surface of the object to isolate air. The two work together to retard flame, resulting in better flame retardancy. When added to adhesives and applied to particleboard, its flame retardancy rating and thermal stability can be significantly improved.

[0018] (3) The antibacterial agent prepared in this invention has two key structures: chitosan and piperazine. The two structures form a highly efficient synergistic effect. The piperazine structure is the core of the antibacterial effect. With its unique chemical properties, it can directly act on bacteria and inhibit their growth and reproduction. Chitosan provides good biocompatibility for the entire antibacterial system, ensuring that the antibacterial agent is safer when in contact with organisms and reducing irritation or adverse reactions. Compared with small molecule antibacterial agents, this antibacterial agent has a high molecular structure. The chitosan and piperazine structures are stably combined and are not easy to precipitate from the carrier. This ensures that the antibacterial components continue to play a role and avoids the effectiveness decay or potential harm that may be caused by the precipitation of small molecules. This makes the antibacterial effect more stable and lasting. When this antibacterial agent is added to the adhesive and applied to particleboard, the particleboard has good and lasting antibacterial and anti-mildew properties.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 The infrared spectrum of the modified macromolecular flame retardant of this invention is shown below. Figure 2The images are scanning electron microscope images of chitosan and antibacterial agents of the present invention, wherein (A) is chitosan and (B) is the antibacterial agent. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: A green particleboard based on an environmentally friendly adhesive, comprising particleboard raw materials and adhesive slurry; the adhesive slurry is made from the following raw materials measured in parts by weight: 80 parts epoxy resin, 55 parts acrylic resin, 20 parts modified macromolecular flame retardant, 10 parts antibacterial agent, 5 parts phenyl glycidyl ether, 0.5 parts polydimethylsiloxane, and 10 parts diethylenetriamine; The production process of the green particleboard using the environmentally friendly adhesive includes the following steps: Step 1: Peel, sieve, and remove impurities from bamboo scraps and add them to a pulverizer to grind them into granules. Process them into wood shavings with a length of 120mm, a width of 30mm, and a thickness of 0.4mm. Then dry them to obtain wood shavings with a moisture content of 5% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55°C, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 7% of the weight of the wood shavings to obtain a mixture. Step 3: Spread the mixture to form a slab, pre-press it for 5 minutes on a flat vulcanizing machine at a temperature of 80℃ and a pressure of 1MPa, and then set the temperature of the flat vulcanizing machine to 100℃ and the pressure to 2MPa for hot pressing for 30 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 80°C and a pressure of 2.5MPa for 5 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

[0024] The specific method for preparing the adhesive slurry is as follows: Modified macromolecular flame retardant, antibacterial agent, phenyl glycidyl ether, and polydimethylsiloxane are added to a stirrer and stirred at 300 r / min for 30 min. Then epoxy resin and acrylic resin are added and stirred for 2 h. Diethylenetriamine is then added and cured to obtain the adhesive slurry.

[0025] The preparation method of the modified macromolecular flame retardant includes the following steps: A1: Under nitrogen protection, 200 mL of benzene as solvent, 4.2 g of eugenol, 2.7 g of 2-vinylpyridine, and 0.04 g of azobisisobutyronitrile were added to a 500 mL reactor while stirring. The temperature of the reaction solution was then raised to 62 °C and the reaction was carried out for 17 h. After the reaction was completed, the product was purified and dried under vacuum to obtain the intermediate. A2: Under nitrogen protection, 1.1 g of phenylphosphine dichloride and 180 mL of anhydrous acetonitrile were added to a 500 mL reactor as solvent. The mixture was stirred until homogeneous, heated to 75 °C, and 5.6 g of intermediate was added. Then, 0.6 g of triethylamine was added dropwise. The reaction was carried out for 8 h. After the reaction was completed, the reaction solution was purified and the product was dried under vacuum to obtain the modified macromolecular flame retardant.

[0026] Figure 1 The infrared spectrum of the modified macromolecular flame retardant is shown, with the 3100–3000 cm⁻¹ range being the largest. -1 The characteristic absorption peaks for carbon-hydrogen bonds in the benzene ring are 3000–2800 cm⁻¹. -1 The characteristic absorption peak of saturated carbon-hydrogen bonds is 1600 cm⁻¹. -1 The characteristic absorption peak of the carbon-nitrogen double bond in the pyridine ring is 1256 cm⁻¹. -1 The characteristic absorption peak of the phosphorus-oxygen double bond is at 1048 cm⁻¹. -1 This is a characteristic absorption peak for phosphorus-oxygen-carbon bonds.

[0027] The method for preparing the antibacterial agent includes the following steps: H1: Add 5.4g of dried chitosan to a 500mL reactor, evacuate the reactor, then purge with nitrogen for protection, add 110mL of N,N-dimethylacetamide solvent, raise the temperature to 80℃, and dissolve the chitosan by magnetic stirring to obtain a chitosan solution. H2: 2.8 g of 4,4-diisocyanate dicyclohexylmethane and 0.07 g of dibutyltin dilaurate were added to 50 mL of N,N-dimethylacetamide solvent and stirred until homogeneous to obtain an additive solution. The additive solution was then added to a chitosan solution, and the temperature was set to 80℃. The reaction was carried out for 8 h. Then, 1.7 g of 1,4-bis(3-aminopropyl)piperazine was added, and the reaction was maintained at this temperature for 1.5 h. After the reaction was completed, the insoluble matter and solvent were removed to obtain the antibacterial substance.

[0028] Figure 2The images show scanning electron microscope (SEM) images of chitosan and antibacterial agents. (A) represents chitosan, and (B) represents the antibacterial agent. As can be seen from the images, the surface of chitosan is relatively smooth and its shape is very irregular. In contrast, the surface of the antibacterial agent becomes rough and uneven, with particles in an aggregated state and a smaller particle size than that of chitosan. It can be inferred that the dicyclohexyl and piperazine ring structures were successfully grafted onto the surface of chitosan.

[0029] Example 2: A green particleboard based on an environmentally friendly adhesive, comprising bamboo shavings and adhesive slurry; wherein the adhesive slurry is made from the following raw materials measured in parts by weight: 85 parts epoxy resin, 58 parts acrylic resin, 28 parts modified macromolecular flame retardant, 14 parts antibacterial agent, 7 parts phenyl glycidyl ether, 0.6 parts polydimethylsiloxane, and 11 parts diethylenetriamine; The production process of the green particleboard using the environmentally friendly adhesive includes the following steps: Step 1: Peel, sieve, and remove impurities from bamboo scraps and add them to a pulverizer to grind them into granules. Process them into wood shavings with a length of 125mm, a width of 35mm, and a thickness of 0.5mm. Then dry them to obtain wood shavings with a moisture content of 5% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55°C, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 7% of the weight of the wood shavings to obtain a mixture. Step 3: The mixture is laid out to form a slab, and pre-pressed for 6 minutes on a flat vulcanizing machine at a temperature of 82℃ and a pressure of 1.2MPa. Then, the temperature of the flat vulcanizing machine is set to 120℃ and the pressure to 2.5MPa, and hot-pressed for 40 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 90°C and a pressure of 2.8MPa for 6 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

[0030] The specific method for preparing the adhesive slurry is as follows: Modified macromolecular flame retardant, antibacterial agent, phenyl glycidyl ether, and polydimethylsiloxane were added to a stirrer and stirred at 400 r / min for 40 min. Then epoxy resin and acrylic resin were added and stirred for 2.5 h. Diethylenetriamine was then added and cured to obtain the adhesive slurry.

[0031] The preparation methods of the modified macromolecular flame retardant and antibacterial agent are the same as in Example 1.

[0032] Example 3: A green particleboard based on an environmentally friendly adhesive, comprising bamboo scraps and adhesive slurry; wherein the adhesive slurry is made from the following raw materials measured in parts by weight: 100 parts epoxy resin, 60 parts acrylic resin, 30 parts modified macromolecular flame retardant, 15 parts antibacterial agent, 10 parts phenyl glycidyl ether, 1 part polydimethylsiloxane, and 12 parts diethylenetriamine; The production process of the green particleboard using the environmentally friendly adhesive includes the following steps: Step 1: Peel, sieve, and remove impurities from bamboo scraps and add them to a pulverizer to grind them into granules. Process them into wood shavings with a length of 130mm, a width of 40mm, and a thickness of 0.6mm. Then dry them to obtain wood shavings with a moisture content of 6% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55°C, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 7% of the weight of the wood shavings to obtain a mixture. Step 3: The mixture is laid out to form a slab, and pre-pressed for 7 minutes on a flat vulcanizing machine at a temperature of 85℃ and a pressure of 1.5MPa. Then, the temperature of the flat vulcanizing machine is set to 130℃ and the pressure to 3MPa, and hot-pressed for 45 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 100°C and a pressure of 3MPa for 7 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

[0033] The specific method for preparing the adhesive slurry is as follows: Modified macromolecular flame retardant, antibacterial agent, phenyl glycidyl ether, and polydimethylsiloxane were added to a stirrer and stirred at 500 r / min for 45 min. Then epoxy resin and acrylic resin were added and stirred for 3 h. Finally, diethylenetriamine was added and cured to obtain the adhesive slurry.

[0034] The preparation methods of the modified macromolecular flame retardant and antibacterial agent are the same as in Example 1.

[0035] Comparative Example 1: A green particleboard based on an environmentally friendly adhesive, comprising bamboo shavings and adhesive slurry; wherein the adhesive slurry is made from the following raw materials measured in parts by weight: 85 parts epoxy resin, 58 parts acrylic resin, 14 parts antibacterial agent, 7 parts phenyl glycidyl ether, 0.6 parts polydimethylsiloxane, and 11 parts diethylenetriamine; The production process of the green particleboard using the environmentally friendly adhesive includes the following steps: Step 1: Peel, sieve, and remove impurities from bamboo scraps and add them to a pulverizer to grind them into granules. Process them into wood shavings with a length of 125mm, a width of 35mm, and a thickness of 0.5mm. Then dry them to obtain wood shavings with a moisture content of 5% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55°C, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 7% of the weight of the wood shavings to obtain a mixture. Step 3: The mixture is laid out to form a slab, and pre-pressed for 6 minutes on a flat vulcanizing machine at a temperature of 82℃ and a pressure of 1.2MPa. Then, the temperature of the flat vulcanizing machine is set to 120℃ and the pressure to 2.5MPa, and hot-pressed for 40 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 90°C and a pressure of 2.8MPa for 6 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

[0036] The specific method for preparing the adhesive slurry is as follows: Antibacterial agent, phenyl glycidyl ether, and polydimethylsiloxane were added to a stirrer and stirred at 400 r / min for 40 min. Then epoxy resin and acrylic resin were added and stirred for 2.5 h. Diethylenetriamine was then added and cured to obtain the adhesive slurry.

[0037] The method for preparing the antibacterial substance is the same as in Example 1.

[0038] Comparative Example 2, a green particleboard based on an environmentally friendly adhesive, comprising bamboo shavings and adhesive slurry; wherein the adhesive slurry is made from the following raw materials measured in parts by weight: 85 parts epoxy resin, 58 parts acrylic resin, 28 parts modified macromolecular flame retardant, 7 parts phenyl glycidyl ether, 0.6 parts polydimethylsiloxane, and 11 parts diethylenetriamine; The production process of the green particleboard using the environmentally friendly adhesive includes the following steps: Step 1: Peel, sieve, and remove impurities from bamboo scraps and add them to a pulverizer to grind them into granules. Process them into wood shavings with a length of 125mm, a width of 35mm, and a thickness of 0.5mm. Then dry them to obtain wood shavings with a moisture content of 5% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55°C, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 7% of the weight of the wood shavings to obtain a mixture. Step 3: The mixture is laid out to form a slab, and pre-pressed for 6 minutes on a flat vulcanizing machine at a temperature of 82℃ and a pressure of 1.2MPa. Then, the temperature of the flat vulcanizing machine is set to 120℃ and the pressure to 2.5MPa, and hot-pressed for 40 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 90°C and a pressure of 2.8MPa for 6 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

[0039] The specific method for preparing the adhesive slurry is as follows: Modified macromolecular flame retardant, phenyl glycidyl ether, and polydimethylsiloxane were added to a stirrer and stirred at 400 r / min for 40 min. Then epoxy resin and acrylic resin were added and stirred for 2.5 h. Diethylenetriamine was then added and cured to obtain the adhesive slurry.

[0040] The preparation method of the modified macromolecular flame retardant is the same as in Example 1.

[0041] Comparative Example 3, a green particleboard based on an environmentally friendly adhesive, comprising bamboo shavings and adhesive slurry; wherein the adhesive slurry is made from the following raw materials measured in parts by weight: 85 parts epoxy resin, 58 parts acrylic resin, 7 parts phenyl glycidyl ether, 0.6 parts polydimethylsiloxane, and 11 parts diethylenetriamine. The production process of the green particleboard using the environmentally friendly adhesive includes the following steps: Step 1: Peel, sieve, and remove impurities from bamboo scraps and add them to a pulverizer to grind them into granules. Process them into wood shavings with a length of 125mm, a width of 35mm, and a thickness of 0.5mm. Then dry them to obtain wood shavings with a moisture content of 5% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55°C, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 7% of the weight of the wood shavings to obtain a mixture. Step 3: The mixture is laid out to form a slab, and pre-pressed for 6 minutes on a flat vulcanizing machine at a temperature of 82℃ and a pressure of 1.2MPa. Then, the temperature of the flat vulcanizing machine is set to 120℃ and the pressure to 2.5MPa, and hot-pressed for 40 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 90°C and a pressure of 2.8MPa for 6 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

[0042] The specific method for preparing the adhesive slurry is as follows: Phenyl glycidyl ether and polydimethylsiloxane were added to a stirrer and stirred at 400 r / min for 40 min. Then epoxy resin and acrylic resin were added and stirred for 2.5 h. Diethylenetriamine was then added and cured to obtain the adhesive slurry.

[0043] Test example: (1) Anti-mildew performance test: The particleboard prepared in Examples 1-3 and Comparative Examples 1-3 were used as test samples. The anti-mildew performance test was carried out in accordance with the standard GB / T 18261-2013. Each group was repeated three times and the average value was taken as the test result. Fusarium moniliforme, Aspergillus niger and Penicillium citrinum used in the experiment were purchased from Shanghai Beinuo Biotechnology Co., Ltd., Alternaria alternata and Trichoderma viride were purchased from Shanghai Bangjing Industrial Co., Ltd., and Diplocosaurus cocoa was purchased from Shanghai Youlike Life Science Co., Ltd. The test results are shown in the table below.

[0044] Note: Infection value 0 indicates that there are no mycelia or mold spots on the sample surface; infection value 1 indicates that the infected area of ​​the sample surface is <1 / 4; infection value 2 indicates that the infected area of ​​the sample surface is 1 / 4-1 / 2; infection value 3 indicates that the infected area of ​​the sample surface is 1 / 2-3 / 4; infection value 4 indicates that the infected area of ​​the sample surface is >3 / 4.

[0045] Based on the analysis of the above test results, it can be seen that the particleboard prepared in Examples 1-3 has good anti-mildew properties, indicating that the addition of antibacterial agents enables the particleboard to exert antibacterial and anti-mildew effects; the content of antibacterial agents in Comparative Example 1 is less than that in Examples 1-3, and its anti-mildew effect is second best; no antibacterial agents were added to the particleboard prepared in Comparative Examples 2 and 3, so the anti-mildew effect is poor.

[0046] (2) Flame retardant performance test: The limiting oxygen index was determined using an HC900-2 oxygen index meter according to standard GB / T 2406.2-2009. The particleboard prepared in Examples 1-3 and Comparative Examples 1-3 was made into strips to obtain test specimens, each with dimensions of 120mm×10mm×10mm. The test results are shown in the table below.

[0047] Analysis of the test results above shows that the particleboard prepared in Examples 1-3 has a higher oxygen index, indicating that the addition of modified macromolecular flame retardants enables the particleboard to exhibit excellent flame retardant performance. The proportion of modified macromolecular flame retardants in Comparative Example 2 is less than that in Examples 1-3, so its flame retardant effect is second best. Comparative Examples 1 and 3 did not add modified macromolecular flame retardants, so they performed the worst in terms of flame retardant performance.

[0048] (3) Mechanical property testing: Referring to standard B / T17657-2013 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", the elastic modulus, static bending strength, internal bond strength, and 24-hour thickness swelling rate of the particleboard prepared in Examples 1-3 and Comparative Examples 1-3 were tested using a microcomputer-controlled electronic mechanical testing machine. The test results are shown in the table below.

[0049] Analysis of the above test results shows that the particleboard prepared in Examples 1-3 of this invention exhibits excellent mechanical properties. This is because the rigid benzene ring, pyridine structure, chitosan, piperazine, and other structural components contained in Examples 1-3 form a synergistic and complementary structural system, which strengthens the mechanical support network of the particleboard at the molecular level, thereby improving the overall mechanical properties of the particleboard. In Example 2, due to the addition of modified macromolecular flame retardants containing rigid structures such as benzene rings and pyridine, its mechanical properties are better than those of Comparative Example 1 and Comparative Example 3. Since the proportion of mechanical structures in the structures of Comparative Example 1 and Comparative Example 3 decreases sequentially, the mechanical properties show a gradual downward trend.

[0050] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A production process for green particleboard based on environmentally friendly adhesives, characterized in that, Includes the following steps: Step 1: Peel, sieve, and remove impurities from the raw wood shavings. Then, put them into a pulverizer and crush them into granules. Process them into wood shavings with a length of 120-130mm, a width of 30-40mm, and a thickness of 0.4-0.6mm. Then, dry them to obtain raw wood shavings with a moisture content of 5-6% for later use. Step 2: Put the wood shavings into the glue mixer, heat the adhesive slurry to 55-65℃, pump it into the glue spraying system, and spray it onto the surface of the wood shavings. The amount of glue applied is 6-8% of the weight of the wood shavings to obtain a mixture. Step 3: The mixture is laid out to form a slab, and pre-pressed for 5-7 minutes on a flat vulcanizing machine at a temperature of 80-85℃ and a pressure of 1-1.5MPa. Then, the temperature of the flat vulcanizing machine is set to 100-130℃ and the pressure is 2-3MPa, and hot-pressed for 30-45 minutes. Step 4: After hot pressing, the sample, along with the mold, is placed on a flat vulcanizing machine at a temperature of 80-100℃ and a pressure of 2.5-3MPa for 5-7 minutes to set its shape. Step 5: After the shaped board is cooled, the edges are trimmed, and finally sanded to obtain green particleboard.

2. The production process of green particleboard based on environmentally friendly adhesive according to claim 1, characterized in that, The raw material for the wood shavings is bamboo scraps or waste wood.

3. The production process of green particleboard based on environmentally friendly adhesive according to claim 1, characterized in that, The particleboard comprises particleboard raw materials and adhesive slurry; the adhesive slurry is made from the following raw materials measured in parts by weight: 80-100 parts epoxy resin, 55-60 parts acrylic resin, 20-30 parts modified macromolecular flame retardant, 10-15 parts antibacterial agent, 5-10 parts diluent, 0.5-1 part leveling agent, and 10-12 parts curing agent.

4. The production process of green particleboard based on environmentally friendly adhesive according to claim 3, characterized in that, The preparation method of the modified macromolecular flame retardant includes the following steps: A1: Under nitrogen protection, benzene as a solvent, eugenol, 2-vinylpyridine, and azobisisobutyronitrile were added to the reactor while stirring. The temperature of the reaction solution was then raised to 60-65℃ and the reaction was carried out for 16-18 hours. After the reaction was completed, the product was purified and dried under vacuum to obtain the intermediate. A2: Under nitrogen protection, add phenylphosphodichloride and anhydrous acetonitrile as solvent to the reactor, stir evenly, raise the temperature to 70-80℃, add intermediate and triethylamine, and react for 8-9 hours. After the reaction is completed, purify the reaction solution and vacuum dry the product to obtain the modified macromolecular flame retardant.

5. The production process of green particleboard based on environmentally friendly adhesive according to claim 3, characterized in that, The method for preparing the antibacterial substance Includes the following steps: H1: Add dried chitosan to the reactor, evacuate the reactor, then introduce nitrogen for protection, add N,N-dimethylacetamide solvent, raise the temperature to 80-85℃, and dissolve the chitosan by magnetic stirring to obtain a chitosan solution. H2: Add 4,4-diisocyanate dicyclohexylmethane and dibutyltin dilaurate to N,N-dimethylacetamide solvent and stir until homogeneous to obtain an additive solution. Add the additive solution to chitosan solution and set the temperature to 80-85℃. React for 8-8.5 h. Then add 1,4-bis(3-aminopropyl)piperazine and keep the reaction at the specified temperature. After the reaction is complete, remove the insoluble matter and solvent to obtain the antibacterial substance.

6. The production process of green particleboard based on environmentally friendly adhesive according to claim 5, characterized in that, The heat preservation reaction time in step H2 is 1.5-2 hours.

7. The production process of green particleboard based on environmentally friendly adhesive according to claim 3, characterized in that, The diluent is phenyl glycidyl ether or ethylene glycol diglycidyl ether; the leveling agent is an acrylate leveling agent or an organosilicon leveling agent; the curing agent is an amine or an anhydride.

8. The production process of green particleboard based on environmentally friendly adhesive according to claim 1, characterized in that, The specific method for preparing the adhesive slurry is as follows: Add the modified macromolecular flame retardant, antibacterial agent, diluent, and leveling agent to the mixer and stir for 30-45 minutes. Then add epoxy resin and acrylic resin and stir for 2-3 hours. Finally, add the curing agent and cure to obtain the adhesive slurry.

9. The production process of green particleboard based on environmentally friendly adhesive according to claim 8, characterized in that, The stirring speed is 300-500 r / min.

10. A green particleboard based on an environmentally friendly adhesive, characterized in that, It is prepared using the production process described in any one of claims 1-9.

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