Bacteriostatic damp-proof bamboo-based cabinet board and preparation method thereof

Abstract

The invention relates to the field of plates, and discloses a bacteriostatic and moistureproof bamboo-based cabinet board and a preparation method thereof.The preparation method comprises the steps that bamboo shavings are placed in paraffin emulsion to be soaked, classified screening, sizing and mixing, paving and hot press molding are conducted; the sizing components comprise phenolic resin, paraffin emulsion, a modified additive, modified magnesium hydroxide, deionized water and a curing agent; the modified additive is prepared by grafting polyhexamethylene biguanide to N-(2-hydroxypropyl-3-methyl ammonium chloride) chitosan by utilizing phosphonitrilic chloride trimer; the modified magnesium hydroxide is prepared by grafting vinyl-terminated magnesium hydroxide and a siloxane polymer, wherein the siloxane polymer is prepared from octamethylcyclotetrasiloxane, trifluoropropyl methyl cyclotrisiloxane and N-(beta-aminoethyl)-gamma-aminopropyl methyl dimethoxy silane hydrolysate through a ring opening-condensation polymerization reaction; the prepared bamboo-based cabinet board has good mechanical properties, moisture resistance, water resistance, mildew resistance, high temperature resistance and flame retardance.

Description

Technical Field

[0001] This invention belongs to the field of board technology, specifically relating to an antibacterial and moisture-proof bamboo-based cabinet board and its preparation method. Background Technology

[0002] Home health is a major concern for consumers, who demand not only aesthetics and durability but also health and environmental friendliness in home furnishing products. Kitchen cabinets, bathroom vanities, and other products placed in water-contaminated areas are prone to deformation, aging, and mold growth in humid environments, seriously affecting product usability and home health. Currently, high-moisture-resistant engineered wood products are expensive, and their water resistance performance in water-contaminated applications is not ideal. Ordinary particleboard and plywood also show unsatisfactory mold growth and thickness changes in water resistance tests. With consumers increasingly demanding environmentally friendly and durable products, a good quality board material significantly impacts the market performance of customized furniture products.

[0003] As an environmentally friendly material, bamboo has been widely used in home furnishing products in recent years. Driven by the dual carbon targets, "replacing plastic with bamboo" is a future development trend in various industries. The National Development and Reform Commission issued a notice on the "Three-Year Action Plan for Accelerating the Development of 'Replacing Plastic with Bamboo'", which aims to promote the accelerated establishment of the "replacing plastic with bamboo" industrial system. In the actual application of bamboo particleboard, because bamboo contains more hemicellulose, starch, protein, soluble sugar and other nutrients than wood, it is susceptible to damage from mold and other fungi. In addition, the presence of a large number of hydrophilic groups makes bamboo very easy to absorb moisture and moisture, and its water resistance and high temperature resistance are generally average. Furthermore, bamboo and its products are flammable materials and are extremely prone to causing fires, which to some extent limits the application range of bamboo. Summary of the Invention

[0004] To address the shortcomings mentioned in the background art, the present invention aims to provide an antibacterial and moisture-proof bamboo-based cabinet board and its preparation method. The prepared bamboo-based cabinet board possesses excellent mechanical properties, moisture-proof and water-resistant properties, mildew resistance, high-temperature resistance, and flame-retardant properties.

[0005] The objective of this invention can be achieved through the following technical solutions: A method for preparing an antibacterial and moisture-proof bamboo-based cabinet board includes the following steps: S1. Slice the bamboo material into slices using a slicer, and then use a ring-type slicer to obtain bamboo shavings; S2. Place the bamboo shavings in paraffin emulsion and soak them at room temperature and pressure for 1-4 hours. S3. The soaked bamboo shavings are dried and graded to obtain coarse bamboo shavings and fine bamboo shavings. S4. The screened coarse bamboo shavings and fine bamboo shavings are separately fed into a ring-type glue mixer for glue application and mixing. S5. Fine bamboo shavings mixed with adhesive are laid out using an airflow method to form a surface board blank, while coarse bamboo shavings mixed with adhesive are laid out using a mechanical method to form a core board blank. S6. The laid-up slabs are fed into the pre-press machine by combining the top and bottom surface slabs and the middle core slab. Then they are fed into the continuous press. The hot-pressed slabs are cooled, stacked, sanded, sawed, sorted and stored in the warehouse to prepare antibacterial and moisture-proof bamboo-based cabinet boards. The adhesive components include the following raw materials in parts by weight: 60-75 parts phenolic resin, 1-2 parts paraffin emulsion, 3-8 parts modified additives, 2-6 parts modified magnesium hydroxide, 5-10 parts deionized water, and 0.5-2 parts curing agent. The modified additive is prepared by quaternizing chitosan with 2,3-epoxypropyltrimethylammonium chloride to obtain N-(2-hydroxypropyl-3-methylammonium chloride) chitosan, and then grafting polyhexamethylene biguanide onto N-(2-hydroxypropyl-3-methylammonium chloride) chitosan using hexachlorocyclotriphosphazene as an intermediate bridge. The modified magnesium hydroxide was prepared by grafting γ-methacryloxypropyltrimethoxysilane onto the surface of magnesium hydroxide to obtain vinyl-terminated magnesium hydroxide, and then by Michael addition reaction of the vinyl-terminated magnesium hydroxide with a siloxane polymer; the siloxane polymer was prepared by ring-opening-condensation polymerization of octamethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane, and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane hydrolysate catalyzed by tetramethylammonium hydroxide.

[0006] Preferably, the thickness of the bamboo shavings in step S1 is 0.2~1mm.

[0007] Preferably, the preparation method of the paraffin emulsion includes the following steps: taking paraffin and a composite emulsifier and stirring them at 80~85℃ until they are evenly mixed, then slowly adding deionized water in batches, emulsifying for 0.5~1h and then stopping heating, continuing to stir and react for 0.5~1h to obtain the paraffin emulsion; the composite emulsifier is a mixture of Tween 80 and Span 80 in a mass ratio of 3:2.

[0008] Preferably, the preparation method of the sizing component includes the following steps: weighing each raw material according to the weight parts, stirring and mixing phenolic resin, paraffin emulsion, modified additive, modified magnesium hydroxide, deionized water and curing agent evenly to obtain the sizing component; the solid content of the phenolic resin is 50%; the curing agent is p-toluenesulfonic acid.

[0009] Preferably, the method for preparing the modified additive includes the following steps: ① Dissolve chitosan in a 2% (v / v) aqueous acetic acid solution, slowly add a mixed solution of 2,3-epoxypropyltrimethylammonium chloride and deionized water, and react at 65-75℃ for 7-8 hours. After the reaction is complete, dialyze and freeze dry to prepare N-(2-hydroxypropyl-3-methylammonium chloride) chitosan. ② Under an ice bath and nitrogen atmosphere, polyhexamethylene biguanide, methanol and potassium carbonate were placed in a reactor, and then a mixed solution of hexachlorocyclotriphosphazene and tetrahydrofuran was added dropwise. The reaction was continued at room temperature for 8-9 hours to prepare solution one. ③ Dissolve N-(2-hydroxypropyl-3-methylammonium chloride) chitosan in deionized water, then slowly add solution one dropwise, and use triethylamine to adjust the pH value of the reaction to maintain neutrality. Place the reaction at 70~75℃ for 12~14h. After the reaction is completed, filter, wash and dry to prepare the modified additive.

[0010] Preferably, the molar ratio of hexachlorocyclotriphosphazene and polyhexamethylene biguanide is 1:3.

[0011] Preferably, the method for preparing the modified magnesium hydroxide includes the following steps: (1) Take magnesium hydroxide and ultrasonically disperse it in ethanol to obtain a dispersion. Take γ-methacryloxypropyltrimethoxysilane, ethanol and deionized water and mix them thoroughly. Then add them to the dispersion. After stirring and mixing, remove oxygen by purging with nitrogen. Place it at 55~65℃ for 4~6h. After the reaction is completed, purify and dry to prepare vinyl-terminated magnesium hydroxide. (2) Take octamethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane and tetramethylammonium hydroxide in a reactor, mix them thoroughly, remove oxygen by purging with nitrogen, and react at 100~105℃ for 2.5~3.5h. Then add the end-capping agent hexamethyldisiloxane and continue the reaction for 1.5~2.5h. Then keep it at 145~150℃ for 2~2.5h to remove the catalyst. Remove unreacted substances by rotary evaporation to prepare siloxane polymer; (3) Take vinyl-terminated magnesium hydroxide and siloxane polymer in a reactor, seal and stir and purge with nitrogen to remove oxygen, and react at 100~105℃ for 5~6h. After the reaction is completed, purify to prepare modified magnesium hydroxide.

[0012] Preferably, in step S5, the ratio of the oven-dry weight of fine bamboo shavings to coarse bamboo shavings is 1:1.

[0013] Preferably, in step S6, the pressure of the pre-press is controlled at 0.5~0.8MPa, the pressure of the continuous press is controlled at 1.2~2.5MPa, the temperature is controlled at 180~220℃, and the hot pressing time is 6~9s / mm.

[0014] An antibacterial and moisture-proof bamboo-based cabinet board is made by the preparation method described above.

[0015] The beneficial effects of this invention are: This invention utilizes 2,3-epoxypropyltrimethylammonium chloride to quaternize chitosan, preparing N-(2-hydroxypropyl-3-methylammonium chloride) chitosan, thereby improving the solubility and antibacterial properties of chitosan. Then, using hexachlorocyclotriphosphazene as an intermediate bridge, the amino group in polyhexamethylene biguanide undergoes a substitution reaction with hexachlorocyclotriphosphazene. Subsequently, the remaining chlorine atoms continue to undergo a substitution reaction with the hydroxyl groups in N-(2-hydroxypropyl-3-methylammonium chloride) chitosan, thus grafting polyhexamethylene biguanide onto N-(2-hydroxypropyl-3-methylammonium chloride) chitosan to prepare a modified additive. Polyhexamethylene biguanide possesses advantages such as high water solubility, chemical stability, excellent antibacterial activity, and low toxicity, giving the material superior resistance to mildew. Simultaneously, the introduced nitrogen and phosphorus elements work together in both the condensed and gas phases to exert flame-retardant effects, endowing the material with good flame-retardant properties.

[0016] This invention utilizes the silanol groups generated from the hydrolysis of γ-methacryloxypropyltrimethoxysilane to undergo a dehydration condensation reaction with the hydroxyl groups on the surface of magnesium hydroxide to prepare vinyl-terminated magnesium hydroxide. Simultaneously, this invention introduces trifluoropropyl groups into the intermolecular space of the polysiloxane backbone through a ring-opening-condensation reaction catalyzed by tetramethylammonium hydroxide with hydrolysates of octamethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane, and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, preparing a siloxane polymer. Then, the secondary amine and amino groups introduced into the siloxane polymer undergo a Michael addition reaction with the vinyl-terminated magnesium hydroxide to prepare modified magnesium hydroxide. Magnesium hydroxide, as a common environmentally friendly flame retardant, can simultaneously improve the flame retardancy and smoke suppression performance of the material. The grafting reaction bonds the siloxane polymer to the surface of magnesium hydroxide through strong chemical bonds, which is beneficial for the uniform dispersion of magnesium hydroxide particles. Furthermore, the introduction of trifluoropropyl groups and polysiloxane molecular chains endows the material with excellent moisture resistance, water resistance, and high-temperature resistance. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example 1

[0018] A method for preparing a paraffin emulsion includes the following steps: Take 100g of food-grade paraffin wax No. 58 and 10g of composite emulsifier (Tween 80 and Span 80 mixed in a mass ratio of 3:2) and stir them at 85℃ until they are evenly mixed. Then, slowly add deionized water in batches. After emulsifying for 1 hour, stop heating and continue stirring for 0.5 hours to prepare a paraffin emulsion with a solid content of 12%. Example 2

[0019] A method for preparing a modified additive includes the following steps: ① Dissolve 5g of chitosan in 200mL of 2% acetic acid aqueous solution, slowly add 25g of a mixed solution of 2,3-epoxypropyltrimethylammonium chloride and 20mL of deionized water, and react at 70℃ for 8h. After the reaction is completed, dialyze and freeze dry to prepare N-(2-hydroxypropyl-3-methylammonium chloride) chitosan; ② Under an ice bath and nitrogen atmosphere, 2.28 g of polyhexamethylene biguanide, 10 mL of methanol and 0.4 g of potassium carbonate were placed in a reactor, and then a mixed solution of 0.71 g of hexachlorocyclotriphosphazene and 20 mL of tetrahydrofuran was added dropwise. The reaction was continued at room temperature for 8 h to prepare solution one. ③ Dissolve 0.72g of N-(2-hydroxypropyl-3-methylammonium chloride) chitosan in 30mL of deionized water, then slowly add solution one dropwise. Adjust the pH of the reaction to maintain neutrality using triethylamine, and react at 75℃ for 14h. After the reaction is completed, filter, wash and dry to prepare the modified additive. Example 3

[0020] A method for preparing modified magnesium hydroxide includes the following steps: (1) Take 2g of magnesium hydroxide and ultrasonically disperse it in 100mL of ethanol to obtain a dispersion. Take 4g of γ-methacryloxypropyltrimethoxysilane, 90mL of ethanol and 20mL of deionized water and mix them thoroughly. Then add them to the dispersion. After stirring and mixing, remove oxygen by purging with nitrogen and place it at 60℃ for 5h. After the reaction is completed, purify and dry to prepare vinyl-terminated magnesium hydroxide. (2) Take 14.8g of octamethylcyclotetrasiloxane, 18.7g of trifluoropropylmethylcyclotrisiloxane, 2.1g of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane and 0.1% of tetramethylammonium hydroxide by total mass of siloxane monomers into a reactor, mix thoroughly, remove oxygen by purging with nitrogen, and react at 100℃ for 3h. Then add the end-capping agent hexamethyldisiloxane and continue the reaction for 2h. Then keep warm at 150℃ for 2h to remove the catalyst, and remove unreacted substances by rotary evaporation to prepare siloxane polymer; (3) Take 2g of vinyl-terminated magnesium hydroxide and 0.8g of siloxane polymer in a reactor, seal and stir and purge with nitrogen to remove oxygen, and react at 100℃ for 6h. After the reaction is completed, purify to prepare modified magnesium hydroxide. Example 4

[0021] A component for sizing comprises the following raw materials in parts by weight: 62 parts of phenolic resin with a solid content of 50%, 1.2 parts of paraffin emulsion prepared in Example 1, 3.3 parts of modified additive prepared in Example 2, 2.3 parts of modified magnesium hydroxide prepared in Example 3, 5.5 parts of deionized water, and 0.6 parts of curing agent p-toluenesulfonic acid.

[0022] The preparation method of the above-mentioned sizing component includes the following steps: weigh each raw material according to the weight parts, stir and mix phenolic resin with a solid content of 50%, paraffin emulsion, modified additive, modified magnesium hydroxide, deionized water and curing agent p-toluenesulfonic acid evenly to obtain the sizing component. Example 5

[0023] A component for sizing comprises the following raw materials in parts by weight: 67 parts of phenolic resin with a solid content of 50%, 1.5 parts of paraffin emulsion prepared in Example 1, 5.2 parts of modified additive prepared in Example 2, 4.1 parts of modified magnesium hydroxide prepared in Example 3, 7.8 parts of deionized water, and 1.2 parts of curing agent p-toluenesulfonic acid.

[0024] The preparation method of the above-mentioned sizing components is the same as that in Example 4. Example 6

[0025] A component for sizing comprises the following raw materials in parts by weight: 74 parts of phenolic resin with a solid content of 50%, 1.8 parts of paraffin emulsion prepared in Example 1, 7.7 parts of modified additive prepared in Example 2, 5.6 parts of modified magnesium hydroxide prepared in Example 3, 9.1 parts of deionized water, and 1.7 parts of curing agent p-toluenesulfonic acid.

[0026] The preparation method of the above-mentioned sizing components is the same as that in Example 4. Example 7

[0027] A method for preparing an antibacterial and moisture-proof bamboo-based cabinet board includes the following steps: S1. Selected bamboo from the southern foothills of Wuyi Mountain, aged 4-5 years. The bamboo species is single and the bamboo age is similar. The bamboo is sliced ​​using a shaving machine and then processed into bamboo shavings by a ring shaving machine. S2. Place the bamboo shavings in the paraffin emulsion prepared in Example 1 and immerse them at room temperature and pressure for 2 hours. S3. The soaked bamboo shavings are sent to a single-channel dryer for drying. The dried bamboo shavings are then sent to a roller grading and screening machine with moving screen holes to obtain coarse bamboo shavings and fine bamboo shavings. S4. The screened coarse bamboo shavings and fine bamboo shavings are respectively fed into a ring mixer and mixed using the sizing component prepared in Example 4. S5. Fine bamboo shavings mixed with adhesive are laid out using an airflow method to form the surface layer board blank, and coarse bamboo shavings mixed with adhesive are laid out using a mechanical method to form the core layer board blank, controlling the oven-dry weight ratio of coarse and fine shavings to be 1:1. S6. The laid-out slabs are fed into a pre-press machine with a combination of a top and bottom layer of surface slabs and a middle layer of core slabs. The pressure is controlled at 0.7MPa. Then, they are fed into a continuous press with a pressure controlled at 2MPa and a temperature controlled at 185℃. The hot pressing time is 7s / mm. The hot-pressed boards are then cooled, stacked, sanded, sawed, sorted, and stored in the warehouse to prepare antibacterial and moisture-proof bamboo-based cabinet boards. Example 8

[0028] A method for preparing antibacterial and moisture-proof bamboo-based cabinet board, compared with Example 7, involves replacing the adhesive component prepared in Example 4 with the adhesive component prepared in Example 5 in equal amounts, while the remaining raw materials and steps are the same as in Example 7. Example 9

[0029] A method for preparing antibacterial and moisture-proof bamboo-based cabinet board, compared with Example 7, involves replacing the adhesive component prepared in Example 4 with the adhesive component prepared in Example 6 in equal amounts, while the remaining raw materials and steps are the same as in Example 7.

[0030] Comparative Example 1 A component for sizing comprises the following raw materials in parts by weight: 74 parts of phenolic resin with a solid content of 50%, 1.8 parts of paraffin emulsion prepared in Example 1, 7.7 parts of N-(2-hydroxypropyl-3-methylammonium chloride) chitosan prepared in Example 2, 5.6 parts of modified magnesium hydroxide prepared in Example 3, 9.1 parts of deionized water, and 1.7 parts of p-toluenesulfonic acid as a curing agent.

[0031] The preparation method of the above-mentioned sizing components is the same as that in Example 4.

[0032] Comparative Example 2 A component for sizing comprises the following raw materials in parts by weight: 74 parts of phenolic resin with a solid content of 50%, 1.8 parts of paraffin emulsion prepared in Example 1, 7.7 parts of modified additive prepared in Example 2, 5.6 parts of magnesium hydroxide, 9.1 parts of deionized water, and 1.7 parts of p-toluenesulfonic acid curing agent.

[0033] The preparation method of the above-mentioned sizing components is the same as that in Example 4.

[0034] Comparative Example 3 A method for preparing antibacterial and moisture-proof bamboo-based cabinet board, compared with Example 7, involves replacing the adhesive component prepared in Example 4 with the adhesive component prepared in Comparative Example 1 in equal amounts, while the remaining raw materials and steps are the same as in Example 7.

[0035] Comparative Example 4 A method for preparing antibacterial and moisture-proof bamboo-based cabinet board, compared with Example 7, involves replacing the adhesive component prepared in Example 4 with the adhesive component prepared in Comparative Example 2 in equal amounts, while the remaining raw materials and steps are the same as in Example 7.

[0036] Performance testing The performance of the bamboo-based cabinet panels prepared in Examples 7-9 and Comparative Examples 3-4 was tested: The static bending strength of the sample was determined using the three-point bending method according to GB / T 17657-2022, with sample dimensions of 100mm × 18mm × 5mm. For moisture absorption, the sample was dried to absolute dryness at 105℃ in a forced-air drying oven and weighed. The dried sample was then placed in a constant temperature and humidity chamber at 25℃ and 75% relative humidity for 3 days, and its mass was measured and the moisture absorption rate calculated. (Referring to GB / T...) The anti-mold performance of the samples was tested according to GB / T 2406.2-2013. In a constant temperature and humidity chamber, Aspergillus niger, Penicillium citrinum, and Trichoderma viride were used to conduct a 28-day mold infection test on the samples. After 28 days, the infection value (average of discoloration level) of the samples was checked. Each treatment was repeated in triplicate. The mold control efficacy (E) was calculated using the formula: E = (1 - D1 / D0) × 100%, where D1 and D0 are the average infection values ​​of the sample and the control sample, respectively. The samples were then subjected to a high-temperature treatment at 220℃ for 8 hours before the anti-mold performance was tested to evaluate the samples' high-temperature resistance. The limiting oxygen index was tested according to GB / T 2406.2-2009 to evaluate the flame retardant performance of the samples. The data results are shown in Table 1.

[0037] Table 1 Sample performance test results

[0038] As can be seen from the data in Table 1, the bamboo-based cabinet boards prepared in Examples 7-9 of this invention possess good mechanical properties, moisture resistance, mildew resistance, high-temperature resistance, and flame retardancy. In Comparative Example 3, the sizing component was modified by replacing the modifier with an equal amount of N-(2-hydroxypropyl-3-methylammonium chloride) chitosan. The measured mildew control efficacy and limiting oxygen index were significantly lower than those in Examples 7-9. This is because the introduction of polyhexamethylene biguanide and nitrogen-phosphorus elements in solution one is beneficial to improving the mildew resistance and flame retardancy of the material. In Comparative Example 4, the sizing component was not modified with magnesium hydroxide. The measured static bending strength, mildew control efficacy after 8 hours of high-temperature treatment at 220℃, and limiting oxygen index were lower than those in Examples 7-9, while the moisture absorption rate was higher. This may be due to the agglomeration of magnesium hydroxide particles, leading to a decrease in mechanical and flame retardant properties. Furthermore, the introduction of trifluoropropyl and polysiloxane molecular chains improved the material's moisture resistance, flame retardancy, and high-temperature resistance to some extent.

[0039] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A method for preparing an antibacterial and moisture-proof bamboo-based cabinet board, characterized in that, Includes the following steps: S1. Slice the bamboo material into slices using a slicer, and then use a ring-type slicer to obtain bamboo shavings; S2. Place the bamboo shavings in paraffin emulsion and soak them at room temperature and pressure for 1-4 hours. S3. The soaked bamboo shavings are dried and graded to obtain coarse bamboo shavings and fine bamboo shavings. S4. The screened coarse bamboo shavings and fine bamboo shavings are separately fed into a ring-type glue mixer for glue application and mixing. S5. Fine bamboo shavings mixed with adhesive are laid out using an airflow method to form a surface board blank, while coarse bamboo shavings mixed with adhesive are laid out using a mechanical method to form a core board blank. S6. The laid-up slabs are fed into the pre-press machine by combining the top and bottom surface slabs and the middle core slab. Then they are fed into the continuous press. The hot-pressed slabs are cooled, stacked, sanded, sawed, sorted and stored in the warehouse to prepare antibacterial and moisture-proof bamboo-based cabinet boards. The adhesive components include the following raw materials in parts by weight: 60-75 parts phenolic resin, 1-2 parts paraffin emulsion, 3-8 parts modified additives, 2-6 parts modified magnesium hydroxide, 5-10 parts deionized water, and 0.5-2 parts curing agent. The modified additive is prepared by quaternizing chitosan with 2,3-epoxypropyltrimethylammonium chloride to obtain N-(2-hydroxypropyl-3-methylammonium chloride) chitosan, and then grafting polyhexamethylene biguanide onto N-(2-hydroxypropyl-3-methylammonium chloride) chitosan using hexachlorocyclotriphosphazene as an intermediate bridge. The modified magnesium hydroxide was prepared by grafting γ-methacryloxypropyltrimethoxysilane onto the surface of magnesium hydroxide to obtain vinyl-terminated magnesium hydroxide, and then by Michael addition reaction of the vinyl-terminated magnesium hydroxide with a siloxane polymer; the siloxane polymer was prepared by ring-opening-condensation polymerization of octamethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane, and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane hydrolysate catalyzed by tetramethylammonium hydroxide.

2. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 1, characterized in that, The thickness of the bamboo shavings in step S1 is 0.2~1mm.

3. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 1, characterized in that, The preparation method of the paraffin emulsion includes the following steps: paraffin wax and composite emulsifier are placed at 80~85℃ and stirred and mixed evenly, then deionized water is slowly added in batches, and heating is stopped after emulsification for 0.5~1h. The reaction is continued for 0.5~1h to obtain the paraffin emulsion; the composite emulsifier is Tween 80 and Span 80 mixed in a mass ratio of 3:

2.

4. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 1, characterized in that, The preparation method of the sizing component includes the following steps: weighing each raw material according to the weight parts, stirring and mixing phenolic resin, paraffin emulsion, modified additive, modified magnesium hydroxide, deionized water and curing agent evenly to obtain the sizing component; the solid content of the phenolic resin is 50%; the curing agent is p-toluenesulfonic acid.

5. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 1, characterized in that, The preparation method of the modified additive includes the following steps: ① Dissolve chitosan in a 2% (v / v) aqueous acetic acid solution, slowly add a mixed solution of 2,3-epoxypropyltrimethylammonium chloride and deionized water, and react at 65-75℃ for 7-8 hours. After the reaction is complete, dialyze and freeze dry to prepare N-(2-hydroxypropyl-3-methylammonium chloride) chitosan. ② Under an ice bath and nitrogen atmosphere, polyhexamethylene biguanide, methanol and potassium carbonate were placed in a reactor, and then a mixed solution of hexachlorocyclotriphosphazene and tetrahydrofuran was added dropwise. The reaction was continued at room temperature for 8-9 hours to prepare solution one. ③ Dissolve N-(2-hydroxypropyl-3-methylammonium chloride) chitosan in deionized water, then slowly add solution one dropwise, and use triethylamine to adjust the pH value of the reaction to maintain neutrality. Place the reaction at 70~75℃ for 12~14h. After the reaction is completed, filter, wash and dry to prepare the modified additive.

6. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 5, characterized in that, The molar ratio of hexachlorocyclotriphosphazene and polyhexamethylene biguanide is 1:

3.

7. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 1, characterized in that, The method for preparing the modified magnesium hydroxide includes the following steps: (1) Take magnesium hydroxide and ultrasonically disperse it in ethanol to obtain a dispersion. Take γ-methacryloxypropyltrimethoxysilane, ethanol and deionized water and mix them thoroughly. Then add them to the dispersion. After stirring and mixing, remove oxygen by purging with nitrogen. Place it at 55~65℃ for 4~6h. After the reaction is completed, purify and dry to prepare vinyl-terminated magnesium hydroxide. (2) Take octamethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane and tetramethylammonium hydroxide in a reactor, mix them thoroughly, remove oxygen by purging with nitrogen, and react at 100~105℃ for 2.5~3.5h. Then add the end-capping agent hexamethyldisiloxane and continue the reaction for 1.5~2.5h. Then keep it at 145~150℃ for 2~2.5h to remove the catalyst. Remove unreacted substances by rotary evaporation to prepare siloxane polymer; (3) Take vinyl-terminated magnesium hydroxide and siloxane polymer in a reactor, seal and stir and purge with nitrogen to remove oxygen, and react at 100~105℃ for 5~6h. After the reaction is completed, purify to prepare modified magnesium hydroxide.

8. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 1, characterized in that, In step S5, the ratio of the oven-dry weight of fine bamboo shavings to coarse bamboo shavings is 1:

1.

9. The method for preparing antibacterial and moisture-proof bamboo-based cabinet board according to claim 1, characterized in that, In step S6, the pressure of the pre-press is controlled at 0.5~0.8MPa, the pressure of the continuous press is controlled at 1.2~2.5MPa, the temperature is controlled at 180~220℃, and the hot pressing time is 6~9s / mm.

10. A type of antibacterial and moisture-proof bamboo-based cabinet board, characterized in that, It is prepared by the preparation method described in any one of claims 1 to 9.

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