Moisture-proof antibacterial high-density fiberboard and preparation method thereof

Abstract

The application discloses a kind of damp-proof antibacterial high-density fiber board and preparation method thereof, belong to technical field.The damp-proof antibacterial high-density fiber board includes the following components by weight parts: 30-50 parts modified wood fiber, 20-25 parts adhesive, 10-15 parts nano calcium carbonate, 2-5 parts sodium silicate;The raw material of the application is simple, and the operation process is simple, and the operating condition is easy to control;The damp-proof antibacterial high-density fiber board prepared by the application is stable in nature, and has good damp-proof effect, antibacterial effect, strong practicality, strong adaptability, and is suitable for large-scale production and application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artificial board, in particular to a moisture-proof antibacterial high-density fiberboard and a preparation method thereof. BACKGROUND

[0002] The fiberboard is a kind of artificial board made of wood fiber or other plant fiber interlaced and glued together. The fiberboard has the characteristics of uniform and dense material, not easy to crack, small difference between vertical and horizontal strength, excellent processing performance, and good mechanical properties, and is currently widely used in furniture manufacturing, composite door production, floor production, indoor decoration and decoration fields, and is an important indoor decoration and decoration material.

[0003] However, the traditional fiberboard also has some problems: susceptible to moisture, wood fiber or other plant fiber itself has strong water absorption, which is easily affected by the humid environment, leading to deformation, cracking and other problems; poor antibacterial performance, bacteria, mold and other bacteria are easy to breed on the surface of the fiberboard, which reduces the service life and hygiene of the product.

[0004] Chinese patent document CN108687902A discloses a kind of rot-proof antibacterial medium density fiberboard and its manufacturing process, the rot-proof antibacterial medium density fiberboard is made of wood fiber, adhesive, rot-proof antibacterial agent and paraffin wax, each raw material accounts for absolute dry wood fiber percentage: wood fiber 100%, adhesive 8-12%, rot-proof antibacterial agent A 0.25-1%, rot-proof antibacterial agent B 0.25-0.5%, emulsified paraffin wax 1-2%.The present application also discloses the process for manufacturing the rot-proof antibacterial medium density fiberboard, including rot-proof antibacterial agent preparation, material preparation, poplar wood chip rot-proof treatment, hot grinding, gluing, drying, hot pressing and cooling, grading, packaging.The manufacturing process of the present application is simple, ginkgo wood and poplar are used as wood raw materials, ginkgo wood has natural rot-proof effect, boric acid, ethanolamine copper and didecyldimethylammonium chloride are selected as rot-proof antibacterial agents, the rot-proof antibacterial effect of the fiberboard is improved by different application methods, the physical and mechanical properties of the board are little affected.The patent uses paraffin wax to prevent moisture, and the addition of too much paraffin wax will affect the bonding between the adhesive and the fiber;In addition, the wood is immersed in the rot-proof antibacterial agent by high pressure, but this method may damage the mechanical properties of the fiberboard, and the antibacterial agent is not stable combined with the fiberboard, which is easy to fall off and makes the antibacterial performance worse. SUMMARY

[0005] The main purpose of the present application is to provide a kind of moisture-proof antibacterial high-density fiberboard and a preparation method thereof, the fiberboard has good moisture-proof, antibacterial performance, is suitable for large-scale production application.

[0006] To achieve the above object, the application provides a moisture-proof antibacterial high-density fiberboard, which comprises the following components in parts by weight: 30-50 parts of modified wood fiber, 20-25 parts of adhesive, 10-15 parts of nano calcium carbonate, 2-5 parts of sodium silicate and 4-8 parts of curing agent.

[0007] Preferably, the preparation method of the modified wood fiber is as follows.

[0008] 1) soaking wood fiber in sodium hydroxide aqueous solution, filtering after completion of the soaking, washing the collected solid with water until the filtrate is neutral, and drying to obtain pretreated wood fiber;

[0009] 2) adding the pretreated wood fiber into ethanol aqueous solution, then adding 3-glycidyloxypropyltriethoxysilane, heating and stirring to react, filtering, washing and drying after completion of the reaction to obtain glycidyl ether-based wood fiber, then adding the glycidyl ether-based wood fiber into N,N-dimethylformamide, and then adding 4-(trifluoromethyl) aniline to mix and stir uniformly, adjusting the pH value to 8-10, heating to react, filtering, washing and drying after completion of the reaction to obtain modified wood fiber.

[0010] Preferably, the concentration of the sodium hydroxide aqueous solution in step 1) is 2-3 mol / L, the soaking time is 2-4 h, and the drying temperature is 80-95℃.

[0011] Preferably, the concentration of the ethanol aqueous solution in step 2) is 50-70 wt%, and the mass ratio of the pretreated wood fiber to 3-glycidyloxypropyltriethoxysilane is 20-30:1.

[0012] Preferably, the mass ratio of the glycidyl ether-based wood fiber to 4-(trifluoromethyl) aniline in step 2) is 15-25:1.

[0013] Preferably, the adhesive is modified epoxy resin, and the preparation method thereof is as follows.

[0014] dispersing montmorillonite in water, adding cetyltrimethylammonium chloride, filtering after ultrasonic reaction, washing and drying the collected solid; then adding the solid into ethanol aqueous solution, adding γ-aminopropyltriethoxysilane, heating and stirring to react, filtering, washing and drying after completion of the reaction to obtain aminated montmorillonite, dispersing the aminated montmorillonite in water, adding guanidyl propionic acid and EDC / NHS aqueous solution, adjusting the pH value to 5-7, heating to react, filtering, washing and drying the collected solid to obtain a composite antibacterial agent; adding the composite antibacterial agent into epoxy resin to mix and stir uniformly to obtain the modified epoxy resin.

[0015] Preferably, the mass ratio of the montmorillonite and octadecyl trimethyl ammonium bromide is 10:3-5; the mass ratio of the solid and gamma-aminopropyl triethoxysilane is 15-20:2-3; the mass ratio of the aminated montmorillonite and guanidyl propionic acid is 10:3-5; the concentration of EDC in the EDC / NHS aqueous solution is 40-50mM / L, and the concentration of NHS is 40-50mM / L; the mass ratio of the composite antibacterial agent and epoxy resin is 5-8:100.

[0016] The application further discloses a preparation method of the moisture-proof antibacterial high-density fiberboard.

[0017] Preferably, the pre-pressing condition is pre-pressing at 60-70 DEG C and 3-5 MPa for 40-60s, and the hot-pressing condition is hot-pressing at 140-150 DEG C and 5-7 MPa for 3-5 min.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] 1) The raw material obtaining approach of the application is simple, and the operation process is simple and the operation condition is easy to control; the moisture-proof antibacterial high-density fiberboard prepared by the application has stable properties, good moisture-proof effect and antibacterial effect, strong practicability and strong adaptability, and is suitable for large-scale production and application;

[0020] 2) The wood fiber is modified in the application, the wood fiber surface is treated by alkali liquor, the cellulose part of the wood fiber surface is dissolved, the impurities and non-fiber substances on the wood fiber surface are removed, the active hydroxyl groups on the wood fiber molecules are better exposed, the active site of the cellulose is increased, the epoxy groups are introduced on the surface, on one hand, the hydrophobicity is improved, and on the other hand, the 4-(trifluoromethyl) aniline is grafted on the wood fiber by the reaction of the 4-(trifluoromethyl) aniline and the wood fiber, and the hydrophobic moisture-proof performance of the wood fiber is further improved.

[0021] 3)The present application can make the fiberboard have antibacterial property by adding the composite antibacterial agent in the epoxy resin, and the antibacterial agent is combined in the epoxy resin through a chemical bond and cannot fall off from the surface of the fiberboard, and has long-lasting antibacterial performance. The composite antibacterial agent of the present application is obtained by inserting the cationic compound hexadecyltrimethylammonium chloride into the interlayer of the montmorillonite, which can overcome the defect of easy agglomeration of the montmorillonite, and the montmorillonite can adsorb bacteria and cooperate with the hexadecyltrimethylammonium chloride to kill bacteria; the amino group is introduced on the surface of the montmorillonite, which is beneficial to the reaction with the antibacterial agent guanidino propionic acid, and the guanidino propionic acid is grafted on the montmorillonite, and the guanidino propionic acid is connected with the montmorillonite through a chemical bond and is not easy to fall off from the epoxy resin, which is beneficial to improve the long-lasting antibacterial performance of the fiberboard, and the introduction of the montmorillonite in the epoxy resin can improve the compatibility of the montmorillonite and the epoxy resin, improve the toughness of the epoxy resin, reduce the occurrence of brittle fracture, and the more active amino groups in the guanidino propionic acid molecule can react with the epoxy groups in the modified wood fiber during the hot pressing process of the fiberboard, improve the bonding strength of the epoxy resin and the modified wood fiber, and improve the mechanical properties of the fiberboard. DETAILED DESCRIPTION

[0022] For the sake of brevity, the articles used in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.

[0023] Some raw materials used in the present application are as follows:

[0024] Montmorillonite, 325 mesh, Sishui City Ruicheng Bentonite Factory.

[0025] Epoxy resin, E44, purchased from Yuncheng Chemical (Shandong) Co., Ltd.

[0026] Guanidino propionic acid, purchased from Jiangsu Lunfeng Synthetic Technology Co., Ltd.

[0027] Nano calcium carbonate, 400 mesh, purchased from Lingshou Ming Mine Product Co., Ltd.

[0028] Polyamide curing agent, polyamide 650, purchased from Zhengzhou Huipeng Chemical Product Co., Ltd.

[0029] Example 1

[0030] A kind of preparation method of moisture-proof antibacterial high-density fiberboard, comprising the following steps:

[0031] 44.5g adhesive, 25g nanometer calcium carbonate, 7g sodium silicate were stirred and mixed uniformly, then 80g modified wood fiber, 10g polyamide 650 were added and stirred uniformly to obtain a premix, then the premix was added into a mold, after paving, pre-pressing and hot-pressing were carried out, the pre-pressing condition was 65℃, 4MPa for 50s, the hot-pressing condition was 145℃, 6MPa for 4min, after molding, edge cutting and polishing treatment were carried out to obtain the moisture-proof antibacterial high-density fiberboard.

[0032] The preparation method of the modified wood fiber is as follows:

[0033] 1) 150g wood fiber was soaked in 2mol / L sodium hydroxide aqueous solution for 2h, after soaking, filtration was carried out, the collected solid was washed with water until the filtrate was neutral, and drying was carried out at 85℃ to obtain pretreated wood fiber;

[0034] 2) 120g pretreated wood fiber was added into 1000mL 50wt% ethanol aqueous solution, then 40g 3-glycidyloxypropyltriethoxysilane was added, heating and stirring reaction was carried out at 60℃ for 3h, after reaction, filtration, washing and drying were carried out to obtain glycidyl ether-based wood fiber, then 80g glycidyl ether-based wood fiber was added into 500mL N,N-dimethylformamide, then 4g 4-(trifluoromethyl)aniline was added and stirred uniformly, the pH value was adjusted to 9, heating reaction was carried out at 60℃ for 2h, after reaction, filtration, washing and drying were carried out to obtain modified wood fiber.

[0035] The adhesive is modified epoxy resin, and the preparation method is as follows:

[0036] 20g montmorillonite was dispersed in 200mL water, 8.2g hexadecyltrimethylammonium chloride was added, after ultrasonic reaction, filtration was carried out, the collected solid was washed and dried; then 18.6g solid was added into 200mL 50wt% ethanol aqueous solution, 2.5g γ-aminopropyltriethoxysilane was added, heating and stirring reaction was carried out at 50℃ for 3h, after reaction, filtration, washing and drying were carried out to obtain aminated montmorillonite, 10g aminated montmorillonite was dispersed in 200mL water, 4.1g guanidino propionic acid, 200mL EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution was 45mM / L, and the concentration of NHS was 45mM / L) were added, the pH value was adjusted to 6, heating reaction was carried out, filtration was carried out, the collected solid was washed and dried to obtain a composite antibacterial agent; 6.8g composite antibacterial agent was added into 100g epoxy resin and stirred and mixed uniformly to obtain the modified epoxy resin.

[0037] Example 2

[0038] A preparation method of a moisture-proof antibacterial high-density fiberboard comprises the following steps:

[0039] 40 g adhesive, 20 g nano calcium carbonate, 4 g sodium silicate were stirred and mixed uniformly, then 60 g modified wood fiber, 8 g polyamide 650 were added and stirred uniformly to obtain a premix, then the premix was added to a mold, and after paving, pre-pressing and hot pressing were performed, the pre-pressing condition was 60℃, 3MPa for 40s, the hot pressing condition was 140℃, 5MPa for 3min, after molding, edge cutting and polishing treatment were performed to obtain a moisture-proof antibacterial high-density fiberboard.

[0040] The preparation method of the modified wood fiber is as follows:

[0041] 1) 150 g wood fiber was soaked in 3 mol / L sodium hydroxide aqueous solution for 4 h, after soaking, the solid was collected and washed with water until the filtrate was neutral, and then dried at 80℃ to obtain pretreated wood fiber;

[0042] 2) 120 g of pretreated wood fiber was added to 1000 mL of 70wt% ethanol aqueous solution, then 60 g of 3-glycidyl ether oxypropyl triethoxysilane was added, and heated and stirred at 60℃ for 3h, after the reaction was completed, the reaction mixture was filtered, washed and dried to obtain glycidyl ether wood fiber, then 75 g of glycidyl ether wood fiber was added to 500 mL of N,N-dimethylformamide, followed by adding 5 g of 4-(trifluoromethyl) aniline, stirring and mixing uniformly, adjusting the pH value to 10, and heating at 60℃ for 2h, after the reaction was completed, the reaction mixture was filtered, washed and dried to obtain modified wood fiber.

[0043] The adhesive is a modified epoxy resin, and its preparation method is as follows:

[0044] 20 g of montmorillonite was dispersed in 200 mL of water, 6 g of hexadecyl trimethyl ammonium chloride was added, and after ultrasonic reaction, the solid was collected and washed and dried; then 15 g of solid was added to 200 mL of 50wt% ethanol aqueous solution, 2.2 g of γ-aminopropyl triethoxysilane was added, and heated and stirred at 50℃ for 3h, after the reaction was completed, the reaction mixture was filtered, washed and dried to obtain amino montmorillonite, 10 g of amino montmorillonite was dispersed in 200 mL of water, 3 g of guanidyl propionic acid, 200 mL of EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution was 50mM / L, and the concentration of NHS was 50mM / L), the pH was adjusted to 6, and the reaction was heated, filtered, and the solid was collected, washed and dried to obtain a composite antibacterial agent; 5 g of the composite antibacterial agent was added to 100 g of epoxy resin and stirred and mixed uniformly to obtain the modified epoxy resin.

[0045] Example 3

[0046] A preparation method of a moisture-proof antibacterial high-density fiberboard, comprising the following steps:

[0047] 50 g of adhesive, 30 g of nano calcium carbonate and 10 g of sodium silicate are stirred and uniformly mixed, then 100 g of modified wood fiber and 16 g of polyamide 650 are continuously stirred and uniformly mixed to obtain a premix, the premix is then added to a mold, and after paving, pre-pressing and hot-pressing molding are performed, the pre-pressing condition is pre-pressing at 70 DEG C and 5 MPa for 60 s, and the hot-pressing condition is hot-pressing at 150 DEG C and 7 MPa for 5 min, and after molding, edge cutting and polishing treatment are performed to obtain the moisture-proof antibacterial high-density fiberboard.

[0048] The preparation method of the modified wood fiber is as follows:

[0049] 1) 150 g of wood fiber is soaked in a 2.5 mol / L sodium hydroxide aqueous solution for 3 h, after soaking, the solid is collected and washed with water until the filtrate is neutral, and the pretreated wood fiber is obtained by drying at 80 DEG C;

[0050] 2) 120 g of the pretreated wood fiber is added to 1000 mL of 60 wt% ethanol aqueous solution, then 50 g of 3-glycidyloxypropyltriethoxysilane is added, and the mixture is heated and stirred at 60 DEG C for 3 h, after the reaction is completed, the mixture is filtered, washed and dried to obtain glycidyl ether-based wood fiber, then 60 g of the glycidyl ether-based wood fiber is added to 500 mL of N,N-dimethylformamide, 3 g of 4-(trifluoromethyl) aniline is then added and stirred to mix uniformly, the pH value is adjusted to 8, and the mixture is heated and reacted at 60 DEG C for 2 h, after the reaction is completed, the mixture is filtered, washed and dried to obtain the modified wood fiber.

[0051] The adhesive is a modified epoxy resin, and the preparation method thereof is as follows:

[0052] 20 g of montmorillonite is dispersed in 200 mL of water, 10 g of hexadecyltrimethylammonium chloride is added, and after ultrasonic reaction, the mixture is filtered, the solid is collected and washed and dried; then 20 g of the solid is added to 200 mL of 50 wt% ethanol aqueous solution, 3 g of γ-aminopropyltriethoxysilane is added, and the mixture is heated and stirred at 50 DEG C for 3 h, after the reaction is completed, the mixture is filtered, washed and dried to obtain aminated montmorillonite, 10 g of the aminated montmorillonite is dispersed in 200 mL of water, 5 g of guanidyl propionic acid and 200 mL of EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution is 40 mM / L, and the concentration of NHS is 40 mM / L) are added, the pH value is adjusted to 6, and the mixture is heated and reacted, filtered, the solid is collected and washed and dried to obtain a composite antibacterial agent; 8 g of the composite antibacterial agent is added to 100 g of epoxy resin and stirred and uniformly mixed to obtain the modified epoxy resin.

[0053] Comparative Example 1

[0054] A preparation method of a moisture-proof antibacterial high-density fiberboard, similar to example 1, the difference is that the modified wood fiber is glycidyl ether-based wood fiber, which specifically comprises the following steps:

[0055] Stir 44.5g adhesive, 25g nano calcium carbonate, 7g sodium silicate uniformly, then add 80g modified wood fiber, 10g polyamide 650 and continue to stir uniformly to obtain a premix, then add the premix into a mold, and after paving, pre-pressing and hot-pressing molding are performed, the pre-pressing condition is 65℃, 4MPa for 50s, and the hot-pressing condition is 145℃, 6MPa for 4min, and after molding, edge cutting and polishing treatment are performed to obtain the moisture-proof antibacterial high-density fiberboard.

[0056] The preparation method of the modified wood fiber is as follows:

[0057] 1) Soak 150g wood fiber in 2mol / L sodium hydroxide aqueous solution for 2h, after soaking, filter, collect the solid, wash with water until the filtrate is neutral, and dry at 85℃ to obtain pretreated wood fiber;

[0058] 2) Add 120g pretreated wood fiber to 1000mL 50wt% ethanol aqueous solution, then add 40g 3-glycidyl ether propyl triethoxysilane, heat and stir at 60℃ for 3h, after the reaction is completed, filter, wash, and dry to obtain glycidyl ether-based wood fiber.

[0059] The adhesive is a modified epoxy resin, and its preparation method is as follows:

[0060] Disperse 20g montmorillonite in 200mL water, add 8.2g hexadecyl trimethyl ammonium chloride, after ultrasonic reaction, filter, collect the solid, wash and dry; then add 18.6g solid to 200mL 50wt% ethanol aqueous solution, add 2.5g γ-aminopropyl triethoxysilane, heat and stir at 50℃ for 3h, after the reaction is completed, filter, wash, and dry to obtain aminated montmorillonite, disperse 10g aminated montmorillonite in 200mL water, add 4.1g guanidino propionic acid, 200mL EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution is 45mM / L, and the concentration of NHS is 45mM / L), adjust the pH to 6, heat and react, filter, collect the solid, wash and dry to obtain a composite antibacterial agent; add 6.8g composite antibacterial agent to 100g epoxy resin and stir uniformly to obtain the modified epoxy resin.

[0061] Comparative example 2

[0062] A preparation method of a moisture-proof antibacterial high-density fiberboard, similar to example 1, the difference is that the composite antibacterial agent is a mixture of aminated montmorillonite and guanidyl propionic acid, and the specific steps include:

[0063] 44.5g of adhesive, 25g of nano calcium carbonate, 7g of sodium silicate were stirred and mixed uniformly, then 80g of modified wood fiber, 10g of polyamide 650 were added and stirred uniformly to obtain a premix, then the premix was added to a mold, and after paving, pre-pressing and hot pressing were performed, the pre-pressing conditions were 65℃, 4MPa for 50s, the hot pressing conditions were 145℃, 6MPa for 4min, after molding, edge cutting and polishing treatment were performed to obtain a moisture-proof antibacterial high-density fiberboard.

[0064] The preparation method of the modified wood fiber is as follows:

[0065] 1) 150g of wood fiber was soaked in 2mol / L sodium hydroxide aqueous solution for 2h, after soaking, the solid was collected and washed with water until the filtrate was neutral, and then dried at 85℃ to obtain pretreated wood fiber;

[0066] 2) 120g of pretreated wood fiber was added to 1000mL of 50wt% ethanol aqueous solution, then 40g of 3-glycidyl ether oxypropyl triethoxysilane was added, and the mixture was heated and stirred at 60℃ for 3h, after reaction, the mixture was filtered, washed and dried to obtain glycidyl ether-based wood fiber, then 80g of glycidyl ether-based wood fiber was added to 500mL of N,N-dimethylformamide, followed by adding 4g of 4-(trifluoromethyl) aniline and stirring to mix uniformly, adjusting the pH value to 9, and heating at 60℃ for 2h, after reaction, the mixture was filtered, washed and dried to obtain modified wood fiber.

[0067] The adhesive is a modified epoxy resin, and its preparation method is as follows:

[0068] 20g montmorillonite was dispersed in 200mL water, 8.2g hexadecyl trimethyl ammonium chloride was added, after ultrasonic reaction, filtration, washing and drying, 18.6g solid was added into 200mL 50wt% ethanol aqueous solution, 2.5g γ-aminopropyl triethoxysilane was added, and the reaction was carried out at 50℃ for 3h, after the reaction was completed, filtration, washing and drying were carried out to obtain aminated montmorillonite, 10g aminated montmorillonite was dispersed in 200mL water, 4.1g guanidyl propionic acid, 200mL EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution was 45mM / L, and the concentration of NHS was 45mM / L) were added, the pH was adjusted to 6, heating reaction was carried out, filtration was carried out, and the solid was collected, washed and dried to obtain a composite antibacterial agent; 4.8g aminated montmorillonite was mixed with 2g guanidyl propionic acid, and then the composite antibacterial agent was added into 100g epoxy resin to obtain the modified epoxy resin.

[0069] Performance test

[0070] The test objects were the moisture-proof antibacterial high-density fiberboards prepared in Examples 1-3 and Comparative Examples 1-2, and the test contents were as follows:

[0071] Water absorption thickness expansion rate: determined according to GB / T 17657-2022 “Standard for Testing Methods of Physicochemical Properties of Wood-based Panels and Veneered Wood-based Panels”;

[0072] Internal bonding strength and static bending strength were tested according to LY / T 1611-2011 “Fiberboard for Floor Base Material”;

[0073] Antibacterial test: tested according to the antibacterial and mildew resistance test method in JC / T 2039-2010 “Antibacterial and Mildew Resistance Wood Decorative Board”, and the test strain was Staphylococcus aureus (ATCC 6538); the test results are shown in Table 1:

[0074] Table 1: Performance test results of moisture-proof antibacterial high-density fiberboard

[0075]

[0076] As can be seen from the experimental data in Table 1, the moisture-proof antibacterial high-density fiberboard prepared in the application has good moisture-proof, antibacterial and mechanical properties.

[0077] The above are only preferred embodiments of the application, and do not limit the patent scope of the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the patent protection scope of the application.

Claims

1. A moisture resistant antibacterial high density fiberboard, characterized by, By weight, including the following components: 30-50 parts of modified wood fiber, 20-25 parts of adhesive, 10-15 parts of nano calcium carbonate, 2-5 parts of sodium silicate, 4-8 parts of curing agent; The preparation method of the modified wood fiber is as follows: 1) Soak the wood fiber in sodium hydroxide aqueous solution, after soaking, filter, collect the solid, wash with water until the filtrate is neutral, dry to obtain pretreated wood fiber; 2) Add the pretreated wood fiber to the ethanol aqueous solution, then add 3-glycidyl ether oxypropyl triethoxysilane, heat and stir to react, after the reaction is completed, filter, wash, dry to obtain glycidyl ether wood fiber, then add the glycidyl ether wood fiber to N,N-dimethylformamide, then add 4-(trifluoromethyl) aniline and mix well, adjust the pH value to 8-10, heat to react, after the reaction is completed, filter, wash, dry to obtain modified wood fiber; The adhesive is modified epoxy resin, and the preparation method is as follows: Disperse the montmorillonite in water, add cetyltrimethylammonium chloride, after ultrasonic reaction, filter, collect the solid, wash and dry; then add the solid to the ethanol aqueous solution, add γ-aminopropyl triethoxysilane, heat and stir to react, after the reaction is completed, filter, wash, dry to obtain aminated montmorillonite, disperse the aminated montmorillonite in water, add guanidino propionic acid and EDC / NHS aqueous solution, adjust the pH to 5-7, heat to react, filter, collect the solid, wash and dry to obtain a composite antibacterial agent; add the composite antibacterial agent to the epoxy resin, mix well, and then obtain the modified epoxy resin.

2. The moisture-proof antibacterial high-density fiberboard according to claim 1, characterized in that: In step 1), the concentration of the sodium hydroxide aqueous solution is 2-3 mol / L, the soaking time is 2-4 h, and the drying temperature is 80-95℃.

3. The moisture-proof antibacterial high-density fiberboard according to claim 1, characterized in that: In step 2), the mass ratio of pretreated wood fiber to 3-glycidyl ether oxypropyl triethoxysilane is 20-30:

1.

4. The moisture resistant antimicrobial high density fiberboard according to claim 1, wherein: In step 2), the mass ratio of glycidyl ether wood fiber to 4-(trifluoromethyl) aniline is 15-25:

1.

5. The moisture resistant antimicrobial high density fiberboard according to claim 1, wherein: The mass ratio of montmorillonite to cetyltrimethylammonium chloride is 10:3-5; the mass ratio of the solid to γ-aminopropyl triethoxysilane is 15-20:2-3.

6. The moisture resistant antimicrobial high density fiberboard according to claim 1, wherein: The mass ratio of aminated montmorillonite to guanidino propionic acid is 10:3-5; the concentration of EDC in the EDC / NHS aqueous solution is 40-50 mM / L, and the concentration of NHS is 40-50 mM / L; the mass ratio of the composite antibacterial agent to the epoxy resin is 5-8:

100.

7. A method of producing the moisture-proof antibacterial high-density fiberboard according to any one of claims 1 to 6, characterized by, The following steps are included: Mix the adhesive, nano calcium carbonate and sodium silicate well, then add the modified wood fiber and curing agent and continue to mix well to obtain a premix, then add the premix to a mold, lay it up, pre-press, hot-press and form, and then cut the edges, polish and treat to obtain a moisture-proof antibacterial high-density fiberboard.

8. The method of claim 7, wherein: The pre-pressing conditions are 60-70℃, 3-5 MPa for 40-60 s, and the hot-pressing conditions are 140-150℃, 5-7 MPa for 3-5 min.

Images