Moistureproof antibacterial high-density fiberboard and preparation method thereof

Abstract

The invention discloses a damp-proof and antibacterial high-density fiberboard and a preparation method thereof, and belongs to the technical field. The moisture-proof and antibacterial high-density fiberboard is prepared from the following components in parts by weight: 30 to 50 parts of modified wood fiber, 20 to 25 parts of adhesive, 10 to 15 parts of nano calcium carbonate and 2 to 5 parts of sodium silicate, the raw materials are simple to obtain, the operation process is simple, and the operation conditions are easy to control; the prepared damp-proof and antibacterial high-density fiberboard is stable in property, good in damp-proof effect and antibacterial effect, high in practicability, high in adaptability and suitable for large-scale production and application.

Description

Technical Field

[0001] The invention relates to the technical field of artificial boards, and in particular to a moisture-proof and antibacterial high-density fiberboard and a preparation method thereof. Background Art

[0002] Fiberboard is a man-made board made of wood fibers or other plant fibers interwoven and glued together. Fiberboard has the characteristics of uniform and dense material, not easy to crack, small difference in longitudinal and transverse strength, excellent processing performance and good mechanical properties. It is currently widely used in furniture making, composite door production, floor production, interior decoration and decoration, etc., and is an important interior decoration and decoration material.

[0003] However, traditional fiberboards also have some problems: they are easily affected by moisture. Wood fibers or other plant fibers themselves have strong water absorption and are easily affected by humid environments, leading to deformation, cracking and other problems; they have poor antibacterial properties. Bacteria and mold are easily grown on the surface of fiberboards, reducing the service life and hygiene of the product.

[0004] Chinese patent document CN108687902A discloses an antiseptic and antibacterial medium density fiberboard and its manufacturing process, wherein the antiseptic and antibacterial medium density fiberboard is composed of wood fiber, adhesive, antiseptic and antibacterial agent and paraffin, and the percentage of each raw material in the absolute dry wood fiber is: wood fiber 100%, adhesive 8-12%, antiseptic and antibacterial agent A 0.25-1%, antiseptic and antibacterial agent B 0.25-0.5%, emulsified paraffin 1-2%. The present invention also discloses a process for manufacturing the antiseptic and antibacterial medium density fiberboard, including preparation of antiseptic and antibacterial agent, material preparation, antiseptic treatment of poplar wood chips, hot grinding, sizing, drying, hot pressing and cooling, grading, and packaging. The invention has a simple manufacturing process and uses ginkgo wood and poplar wood as wood raw materials. Ginkgo wood has a natural antiseptic effect. Boric acid, copper ethanolamine and didecyl dimethyl ammonium chloride are selected as antiseptics and antibacterial agents. The application methods are different, which improves the antiseptic and antibacterial effect of the fiberboard and has little effect on the physical and mechanical properties of the board. The patent uses paraffin for moisture-proofing, and if the amount added is too much, it will affect the bonding between the adhesive and the fiber; in addition, the patent immerses the wood in the antiseptic and antibacterial agent through high pressure, but this method may damage the mechanical properties of the fiberboard, and the combination of the antibacterial agent and the fiberboard is unstable and easy to fall off, which deteriorates the antibacterial performance. Summary of the invention

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

[0006] To achieve the above objectives, the present invention provides a moisture-proof and antibacterial high-density fiberboard, which comprises the following components 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 the wood fiber in a sodium hydroxide aqueous solution, filtering after the soaking is completed, collecting the solid matter, washing with water until the filtrate is neutral, and drying to obtain the pretreated wood fiber;

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

[0010] Preferably, 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° C.

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

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

[0013] Preferably, the adhesive is a modified epoxy resin, and its preparation method is as follows:

[0014] The method comprises the following steps: dispersing montmorillonite in water, adding hexadecyltrimethylammonium chloride, filtering after ultrasonic reaction, collecting solids, washing and drying; then adding the solids into an ethanol aqueous solution, adding γ-aminopropyltriethoxysilane, heating and stirring for reaction, filtering after the reaction is completed, washing and drying to obtain amino montmorillonite; dispersing the amino montmorillonite in water, adding guanidinopropionic acid and EDC / NHS aqueous solution, adjusting the pH to 5-7, heating for reaction, filtering, collecting solids, washing and drying to obtain a composite antibacterial agent; adding the composite antibacterial agent into an epoxy resin, stirring and mixing to obtain the modified epoxy resin.

[0015] Preferably, the mass ratio of the montmorillonite to octadecyltrimethylammonium bromide is 10:3-5; the mass ratio of the solid matter to γ-aminopropyltriethoxysilane is 15-20:2-3; the mass ratio of the aminated montmorillonite to guanidinopropionic 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 to the epoxy resin is 5-8:100.

[0016] The present invention also discloses a preparation method of the moisture-proof and antibacterial high-density fiberboard, comprising the following steps: stirring and mixing the adhesive, nano-calcium carbonate and sodium silicate evenly, then adding the modified wood fiber and the curing agent and continuing to stir evenly to obtain a premix, then adding the premix into a mold, performing pre-pressing and hot-pressing molding after paving, and performing edge trimming and polishing after molding to obtain the moisture-proof and antibacterial high-density fiberboard.

[0017] Preferably, the pre-pressing condition is 60-70° C. and 3-5 MPa for 40-60 seconds, and the hot pressing condition is 140-150° C. and 5-7 MPa for 3-5 minutes.

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

[0019] 1) The raw materials of the present invention are simple to obtain, the operation process is simple, and the operating conditions are easy to control; the moisture-proof and antibacterial high-density fiberboard prepared by the present invention has stable properties, good moisture-proof and antibacterial effects, strong practicality, strong adaptability and is suitable for large-scale production and application;

[0020] 2) The present invention modifies the wood fiber by treating the wood fiber with an alkali solution, so that the cellulose on the surface of the wood fiber can be partially dissolved, and at the same time, impurities and non-fibrous substances on the surface of the wood fiber are removed, so that the active hydroxyl groups on the wood fiber molecules are better exposed, and the active sites of the cellulose are increased. Then, by introducing epoxy groups on the surface, on the one hand, it is beneficial to improve its hydrophobicity, and on the other hand, it is beneficial to react with 4-(trifluoromethyl)aniline, so that 4-(trifluoromethyl)aniline is grafted on the wood fiber, and the hydrophobic and moisture-proof properties of the wood fiber are further improved;

[0021] 3) The present invention can make the fiberboard have antibacterial properties by adding a composite antibacterial agent to the epoxy resin, and the antibacterial agent is combined in the epoxy resin through chemical bonds and will not fall off from the surface of the fiberboard, thus having long-lasting antibacterial properties. The composite antibacterial agent of the present invention is prepared by inserting a cationic compound hexadecyltrimethylammonium chloride between the layers of montmorillonite, which can overcome the defect that montmorillonite is easy to agglomerate, and on the other hand, montmorillonite can adsorb bacteria and synergistically sterilize with hexadecyltrimethylammonium chloride; amino groups are introduced on the surface of the composite antibacterial agent, which is conducive to reacting with the antibacterial agent guanidinopropionic acid, and guanidinopropionic acid is grafted on the montmorillonite; guanidinopropionic acid is connected to the montmorillonite through a chemical bond, is not easy to fall off from the epoxy resin, and is conducive to improving the long-term antibacterial performance of the fiberboard; and the introduction of montmorillonite into the epoxy resin can improve the compatibility of the montmorillonite and the epoxy resin, improve the toughness of the epoxy resin, and reduce the occurrence of brittle fracture; in addition, more active amino groups in the guanidinopropionic acid molecules can react with epoxy groups in the modified wood fiber during the hot pressing process of the fiberboard, thereby improving the bonding strength between the epoxy resin and the modified wood fiber, and is conducive to improving the mechanical properties of the fiberboard. DETAILED DESCRIPTION

[0022] To avoid redundancy, the items 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] The sources of some raw materials used in the present invention are as follows:

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

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

[0026] Guanidine propionic acid was purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.

[0027] Nano calcium carbonate, 400 mesh, was purchased from Lingshou County Ming Mineral Products Co., Ltd.

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

[0029] Example 1

[0030] A method for preparing a moisture-proof and antibacterial high-density fiberboard comprises the following steps:

[0031] 44.5g of adhesive, 25g of nano-calcium carbonate, and 7g of sodium silicate were stirred and mixed evenly, and then 80g of modified wood fiber and 10g of polyamide 650 were added and continued to be stirred evenly to obtain a premix, and then the premix was added into a mold, and pre-pressed and hot-pressed after paving. The pre-pressing conditions were pre-pressed at 65°C and 4MPa for 50s, and the hot-pressing conditions were hot-pressed at 145°C and 6MPa for 4min. After molding, the edges were trimmed and polished to obtain a moisture-proof and antibacterial high-density fiberboard.

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

[0033] 1) soaking 150 g of wood fiber in a 2 mol / L sodium hydroxide aqueous solution for 2 h, filtering after the soaking, collecting the solid, washing with water until the filtrate is neutral, and drying at 85° C. to obtain the pretreated wood fiber;

[0034] 2) 120 g of pretreated wood fiber was added to 1000 mL of 50 wt% ethanol aqueous solution, followed by the addition of 40 g of 3-glycidyloxypropyltriethoxysilane, and the mixture was heated and stirred at 60 ° C for 3 h. After the reaction was completed, the mixture was filtered, washed, and dried to obtain glycidyl wood fiber. Subsequently, 80 g of glycidyl wood fiber was added to 500 mL of N, N-dimethylformamide, and then 4 g of 4-(trifluoromethyl)aniline was added and mixed and stirred evenly. The pH value was adjusted to 9, and the mixture was heated and reacted at 60 ° C for 2 h. After the reaction was completed, the mixture was filtered, washed, and dried to obtain modified wood fiber.

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

[0036] 20 g of montmorillonite was dispersed in 200 mL of water, 8.2 g of hexadecyltrimethylammonium chloride was added, and the mixture was subjected to ultrasonic reaction and filtered. The solid was collected, washed and dried. Then 18.6 g of the solid was added to 200 mL of 50 wt% ethanol aqueous solution, 2.5 g of γ-aminopropyltriethoxysilane was added, and the mixture was heated and stirred at 50° C. for 3 h. After the reaction was completed, the mixture was filtered, washed and dried to obtain amino montmorillonite. 10 g of amino montmorillonite was dispersed in 200 mL of water, 4.1 g of guanidinopropionic acid and 200 mL of EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution was 45 mM / L, and the concentration of NHS was 45 mM / L) were added, the pH was adjusted to 6, the mixture was heated for reaction, filtered, the solid was collected, washed and dried to obtain a composite antibacterial agent. 6.8 g of the composite antibacterial agent was added to 100 g of epoxy resin, and the mixture was stirred and mixed to obtain the modified epoxy resin.

[0037] Example 2

[0038] A method for preparing a moisture-proof and antibacterial high-density fiberboard comprises the following steps:

[0039] 40g of adhesive, 20g of nano-calcium carbonate, and 4g of sodium silicate were stirred and mixed evenly, and then 60g of modified wood fiber and 8g of polyamide 650 were added and continued to be stirred evenly to obtain a premix, and then the premix was added into a mold, and pre-pressed and hot-pressed after paving. The pre-pressing conditions were pre-pressed at 60°C and 3MPa for 40s, and the hot-pressing conditions were hot-pressed at 140°C and 5MPa for 3min. After molding, the edges were trimmed and polished to obtain a moisture-proof and antibacterial high-density fiberboard.

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

[0041] 1) soaking 150 g of wood fiber in a 3 mol / L sodium hydroxide aqueous solution for 4 h. After the soaking is completed, filtering, collecting the solid, washing with water until the filtrate is neutral, and drying at 80° C. to obtain the pretreated wood fiber;

[0042] 2) 120 g of pretreated wood fiber was added to 1000 mL of 70 wt% ethanol aqueous solution, followed by the addition of 60 g of 3-glycidyloxypropyltriethoxysilane, and the mixture was heated and stirred at 60 ° C for 3 h. After the reaction was completed, the mixture was filtered, washed, and dried to obtain glycidyl wood fiber. Subsequently, 75 g of glycidyl wood fiber was added to 500 mL of N, N-dimethylformamide, and then 5 g of 4-(trifluoromethyl)aniline was added and mixed and stirred evenly. The pH value was adjusted to 10, and the mixture was heated and reacted at 60 ° C for 2 h. After the reaction was completed, the 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] Disperse 20g of montmorillonite in 200mL of water, add 6g of hexadecyltrimethylammonium chloride, and filter after ultrasonic reaction. Collect the solid, wash and dry it; then add 15g of the solid into 200mL of 50wt% ethanol aqueous solution, add 2.2g of γ-aminopropyltriethoxysilane, heat and stir at 50°C for 3h, filter after the reaction is completed, wash and dry to obtain amino montmorillonite; disperse 10g of amino montmorillonite in 200mL of water, add 3g of guanidinopropionic acid and 200mL of EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution is 50mM / L, and the concentration of NHS is 50mM / L), adjust the pH to 6, heat to react, filter, collect the solid, wash and dry it to obtain the composite antibacterial agent; add 5g of the composite antibacterial agent into 100g of epoxy resin, stir and mix well to obtain the modified epoxy resin.

[0045] Example 3

[0046] A method for preparing a moisture-proof and antibacterial high-density fiberboard comprises the following steps:

[0047] 50g of adhesive, 30g of nano-calcium carbonate, and 10g of sodium silicate were stirred and mixed evenly, and then 100g of modified wood fiber and 16g of polyamide 650 were added and continued to be stirred evenly to obtain a premix, and then the premix was added into a mold, and pre-pressed and hot-pressed after paving. The pre-pressing conditions were pre-pressed at 70°C and 5MPa for 60s, and the hot-pressing conditions were hot-pressed at 150°C and 7MPa for 5min. After molding, the edges were trimmed and polished to obtain a moisture-proof and antibacterial high-density fiberboard.

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

[0049] 1) soaking 150 g of wood fiber in a 2.5 mol / L sodium hydroxide aqueous solution for 3 h, filtering after the soaking, collecting the solid, washing with water until the filtrate is neutral, and drying at 80° C. to obtain the pretreated wood fiber;

[0050] 2) 120 g of pretreated wood fiber was added to 1000 mL of 60 wt% ethanol aqueous solution, followed by the addition of 50 g of 3-glycidyloxypropyltriethoxysilane, and the mixture was heated and stirred at 60 ° C for 3 h. After the reaction was completed, the mixture was filtered, washed, and dried to obtain glycidyl wood fiber. Subsequently, 60 g of glycidyl wood fiber was added to 500 mL of N, N-dimethylformamide, and then 3 g of 4-(trifluoromethyl)aniline was added and mixed and stirred evenly. The pH value was adjusted to 8, and the mixture was heated and reacted at 60 ° C for 2 h. After the reaction was completed, the mixture was filtered, washed, and dried to obtain modified wood fiber.

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

[0052] Disperse 20g of montmorillonite in 200mL of water, add 10g of hexadecyltrimethylammonium chloride, and filter after ultrasonic reaction. Collect the solid, wash and dry it; then add 20g of the solid into 200mL of 50wt% ethanol aqueous solution, add 3g of γ-aminopropyltriethoxysilane, heat and stir at 50°C for 3h, filter after the reaction is completed, wash and dry to obtain amino montmorillonite; disperse 10g of amino montmorillonite in 200mL of water, add 5g of guanidinopropionic acid and 200mL of EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution is 40mM / L, and the concentration of NHS is 40mM / L), adjust the pH to 6, heat to react, filter, collect the solid, wash and dry it to obtain the composite antibacterial agent; add 8g of the composite antibacterial agent into 100g of epoxy resin, stir and mix well to obtain the modified epoxy resin.

[0053] Comparative Example 1

[0054] A method for preparing a moisture-proof and antibacterial high-density fiberboard is similar to that of Example 1, except that the modified wood fiber is a glycidyl ether-based wood fiber, and specifically comprises the following steps:

[0055] 44.5g of adhesive, 25g of nano-calcium carbonate, and 7g of sodium silicate were stirred and mixed evenly, and then 80g of modified wood fiber and 10g of polyamide 650 were added and continued to be stirred evenly to obtain a premix, and then the premix was added into a mold, and pre-pressed and hot-pressed after paving. The pre-pressing conditions were pre-pressed at 65°C and 4MPa for 50s, and the hot-pressing conditions were hot-pressed at 145°C and 6MPa for 4min. After molding, the edges were trimmed and polished to obtain a moisture-proof and antibacterial high-density fiberboard.

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

[0057] 1) soaking 150 g of wood fiber in a 2 mol / L sodium hydroxide aqueous solution for 2 h, filtering after the soaking, collecting the solid, washing with water until the filtrate is neutral, and drying at 85° C. to obtain the pretreated wood fiber;

[0058] 2) 120 g of pretreated wood fiber was added to 1000 mL of 50 wt% ethanol aqueous solution, followed by adding 40 g of 3-glycidyloxypropyltriethoxysilane, and heated and stirred at 60° C. for 3 h. After the reaction was completed, the mixture was filtered, washed, and dried to obtain glycidyl wood fiber.

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

[0060] 20 g of montmorillonite was dispersed in 200 mL of water, 8.2 g of hexadecyltrimethylammonium chloride was added, and the mixture was subjected to ultrasonic reaction and filtered. The solid was collected, washed and dried. Then 18.6 g of the solid was added to 200 mL of 50 wt% ethanol aqueous solution, 2.5 g of γ-aminopropyltriethoxysilane was added, and the mixture was heated and stirred at 50° C. for 3 h. After the reaction was completed, the mixture was filtered, washed and dried to obtain amino montmorillonite. 10 g of amino montmorillonite was dispersed in 200 mL of water, 4.1 g of guanidinopropionic acid and 200 mL of EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution was 45 mM / L, and the concentration of NHS was 45 mM / L) were added, the pH was adjusted to 6, the mixture was heated for reaction, filtered, the solid was collected, washed and dried to obtain a composite antibacterial agent. 6.8 g of the composite antibacterial agent was added to 100 g of epoxy resin, and the mixture was stirred and mixed to obtain the modified epoxy resin.

[0061] Comparative Example 2

[0062] A method for preparing a moisture-proof and antibacterial high-density fiberboard is similar to Example 1, except that the composite antibacterial agent is a mixture of amino montmorillonite and guanidinopropionic acid, and specifically comprises the following steps:

[0063] 44.5g of adhesive, 25g of nano-calcium carbonate, and 7g of sodium silicate were stirred and mixed evenly, and then 80g of modified wood fiber and 10g of polyamide 650 were added and continued to be stirred evenly to obtain a premix, and then the premix was added into a mold, and pre-pressed and hot-pressed after paving. The pre-pressing conditions were pre-pressed at 65°C and 4MPa for 50s, and the hot-pressing conditions were hot-pressed at 145°C and 6MPa for 4min. After molding, the edges were trimmed and polished to obtain a moisture-proof and antibacterial high-density fiberboard.

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

[0065] 1) soaking 150 g of wood fiber in a 2 mol / L sodium hydroxide aqueous solution for 2 h, filtering after the soaking, collecting the solid, washing with water until the filtrate is neutral, and drying at 85° C. to obtain the pretreated wood fiber;

[0066] 2) 120 g of pretreated wood fiber was added to 1000 mL of 50 wt% ethanol aqueous solution, followed by the addition of 40 g of 3-glycidyloxypropyltriethoxysilane, and the mixture was heated and stirred at 60 ° C for 3 h. After the reaction was completed, the mixture was filtered, washed, and dried to obtain glycidyl wood fiber. Subsequently, 80 g of glycidyl wood fiber was added to 500 mL of N, N-dimethylformamide, and then 4 g of 4-(trifluoromethyl)aniline was added and mixed and stirred evenly. The pH value was adjusted to 9, and the mixture was heated and reacted at 60 ° C for 2 h. After the reaction was completed, 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] 20 g of montmorillonite was dispersed in 200 mL of water, 8.2 g of hexadecyltrimethylammonium chloride was added, and the mixture was subjected to ultrasonic reaction and filtered. The solid was collected, washed and dried. Then 18.6 g of the solid was added to 200 mL of 50 wt% ethanol aqueous solution, 2.5 g of γ-aminopropyltriethoxysilane was added, and the mixture was heated and stirred at 50° C. for 3 h. After the reaction was completed, the mixture was filtered, washed and dried to obtain the amination montmorillonite. 10 g of the amination montmorillonite was dispersed in 200 mL of water, 4.1 g of guanidinopropionic acid and 200 mL of EDC / NHS aqueous solution (the concentration of EDC in the EDC / NHS aqueous solution was 45 mM / L, and the concentration of NHS was 45 mM / L) were added, the pH was adjusted to 6, the mixture was heated for reaction, filtered, the solid was collected, washed and dried to obtain the composite antibacterial agent. 4.8 g of the amination montmorillonite was mixed with 2 g of guanidinopropionic acid, and the composite antibacterial agent was added to 100 g of epoxy resin and stirred to mix evenly to obtain the modified epoxy resin.

[0069] Performance Testing

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

[0071] Water absorption thickness expansion rate: measured with reference to GB / T 17657-2022 "Standard for test methods of physical and chemical properties of artificial boards and veneer artificial boards";

[0072] The internal bonding strength and static bending strength are tested according to the standard LY / T 1611-2011 "Fiberboard for floor substrate";

[0073] Antibacterial test: The test was conducted in accordance with the antibacterial and antifungal test methods in JC / T 2039-2010 "Antibacterial and Antifungal Wood Decorative Panels". The test strain was Staphylococcus aureus (ATCC 6538). The test results are shown in Table 1:

[0074] Table 1 Test results of moisture-proof and antibacterial high-density fiberboard performance

[0075]

[0076] It can be seen from the experimental data in Table 1 that the moisture-proof and antibacterial high-density fiberboard prepared by the present invention has good moisture-proof and antibacterial mechanical properties.

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

Claims

1. A moisture-proof and antibacterial high-density fiberboard, characterized in that: The invention 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.

2. The moisture-proof and antibacterial high-density fiberboard according to claim 1, characterized in that: The preparation method of the modified wood fiber is as follows: 1) soaking the wood fiber in a sodium hydroxide aqueous solution, filtering after the soaking is completed, collecting the solid matter, washing with water until the filtrate is neutral, and drying to obtain the pretreated wood fiber; 2) adding the pretreated wood fiber to an ethanol aqueous solution, then adding 3-glycidyloxypropyltriethoxysilane, heating and stirring to react, filtering, washing, and drying after the reaction is completed to obtain glycidyl ether-based wood fiber, then adding the glycidyl ether-based wood fiber to N,N-dimethylformamide, and then adding 4-(trifluoromethyl)aniline to mix and stir evenly, adjusting the pH value to 8-10, heating to react, filtering, washing, and drying after the reaction is completed to obtain modified wood fiber.

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

4. The moisture-proof and antibacterial high-density fiberboard according to claim 2, characterized in that: The mass ratio of the pretreated wood fiber to 3-glycidyloxypropyltriethoxysilane is 20-30:

1.

5. The moisture-proof and antibacterial high-density fiberboard according to claim 2, characterized in that: In the step 2), the mass ratio of glycidyl ether-based wood fiber to 4-(trifluoromethyl)aniline is 15-25:

1.

6. The moisture-proof and antibacterial high-density fiberboard according to claim 1, characterized in that: The adhesive is a modified epoxy resin, and its preparation method is as follows: The method comprises the following steps: dispersing montmorillonite in water, adding hexadecyltrimethylammonium chloride, filtering after ultrasonic reaction, collecting solids, washing and drying; then adding the solids into an ethanol aqueous solution, adding γ-aminopropyltriethoxysilane, heating and stirring for reaction, filtering after the reaction is completed, washing and drying to obtain amino montmorillonite; dispersing the amino montmorillonite in water, adding guanidinopropionic acid and EDC / NHS aqueous solution, adjusting the pH to 5-7, heating for reaction, filtering, collecting solids, washing and drying to obtain a composite antibacterial agent; adding the composite antibacterial agent into an epoxy resin, stirring and mixing to obtain the modified epoxy resin.

7. The moisture-proof and antibacterial high-density fiberboard according to claim 6, characterized in that: The mass ratio of the montmorillonite to octadecyltrimethylammonium bromide is 10:3-5; the mass ratio of the solid to γ-aminopropyltriethoxysilane is 15-20:2-3.

8. The moisture-proof and antibacterial high-density fiberboard according to claim 6, characterized in that: The mass ratio of the amino montmorillonite to guanidinopropionic 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.

9. A method for preparing the moisture-proof and antibacterial high-density fiberboard according to any one of claims 1 to 8, characterized in that: The steps include: The adhesive, nano-calcium carbonate and sodium silicate are stirred and mixed evenly, and then the modified wood fiber and curing agent are added and stirred evenly to obtain a premix. The premix is ​​then added into a mold, and pre-pressed and hot-pressed after paving. After molding, the premix is ​​trimmed and polished to obtain a moisture-proof and antibacterial high-density fiberboard.

10. The preparation method according to claim 9, characterized in that: The pre-pressing condition is 60-70° C. and 3-5 MPa for 40-60 seconds, and the hot pressing condition is 140-150° C. and 5-7 MPa for 3-5 minutes.

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