Moisture-proof and antibacterial board for cabinet and preparation method thereof

Abstract

The invention discloses a moisture-proof and antibacterial board for a cabinet and a preparation method of the moisture-proof and antibacterial board, and belongs to the field of wood boards. The moisture-proof antibacterial plate for the cabinet comprises a base plate and an antibacterial coating coated on the outer surface of the base plate, the paint for the antibacterial coating comprises the following raw material components in parts by weight: 4-6 parts by mass of composite antibacterial particles, 10-14 parts by mass of flame-retardant polyurethane, 1-3 parts by mass of an antioxidant and 77-85 parts by mass of a solvent; the composite antibacterial particles are obtained by coating silver-loaded mesoporous titanium dioxide with sulfydryl functionalized mesoporous silicon dioxide; the flame-retardant polyurethane is obtained by carrying out polycondensation on a diisocyanate monomer, flame-retardant polyhydric alcohol and a dihydric alcohol monomer and then carrying out end sealing by using oil alcohol; the flame-retardant polyol is obtained by reacting vanillin and a polyamine monomer, and then reacting and grafting with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, so as to obtain the flame-retardant polyol; the prepared moisture-proof and antibacterial board for the cabinet is good in waterproofness and antibacterial property, and formaldehyde in the environment can be effectively degraded in the light environment.

Description

Technical Field

[0001] The present invention relates to a moisture-proof and antibacterial board for cabinets and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards and the attention to the health of the home environment, as an indispensable part of the kitchen, the moisture-proof, waterproof and antibacterial properties of cabinets have received more and more attention. Traditional cabinet boards are prone to moisture absorption and expansion in a humid environment, resulting in problems such as deformation and mildew. Therefore, it is particularly important to develop a cabinet board with excellent moisture-proof and antibacterial properties.

[0003] The moisture-proof boards currently available on the market are mainly achieved in the following ways: one is to treat the surface or interior of the base material with a moisture-proof agent. Although this method can improve the moisture-proof performance of the board to a certain extent, the long-term effect is limited, and the improvement of waterproof performance is not significant; the second is to use a multi-layer composite structure, such as wrapping one or more layers of moisture-proof materials outside the base material. Although this method improves the overall moisture-proof and waterproof performance of the board, it increases the production cost, and if the joints are not properly treated, it is still difficult to completely prevent moisture intrusion; the third is to introduce an antibacterial agent into the board to achieve the purpose of inhibiting the growth of bacteria. However, the antibacterial agents in the prior art often have the problem of unstable release, resulting in non-persistent antibacterial effects.

[0004] Therefore, the applicant has prepared a moisture-proof and antibacterial board for cabinets. Summary of the Invention

[0005] The object of the present invention is to provide a moisture-proof and antibacterial board for cabinets and a preparation method thereof to solve the technical problems mentioned in the above background art.

[0006] The technical solution for achieving the object of the present invention is as follows: In the first aspect, the present invention provides a moisture-proof and antibacterial board for cabinets, including a base board and an antibacterial coating coated on the outer surface of the base board. The raw material components of the coating for the antibacterial coating are, by weight, 4-6 parts by mass of composite antibacterial particles, 10-14 parts by mass of flame-retardant polyurethane, 1-3 parts by mass of antioxidant, and 77-85 parts by mass of solvent; first, the composite antibacterial particles are mixed with flame-retardant polyurethane and solvent, and 2,2-dimethoxy-2-phenylacetophenone is introduced for the first mixing, and then the remaining raw material components are added and mixed continuously to obtain.

[0007] Further, the composite antibacterial particles are obtained by wrapping silver-loaded mesoporous titanium dioxide with thiol-functionalized mesoporous silica.

[0008] Further, the flame-retardant polyurethane is obtained by polycondensing diisocyanate monomers, flame-retardant polyols, and diols and then end-capping with oleyl alcohol.

[0009] Further, the flame-retardant polyol is obtained by grafting the reaction product of vanillin and polyamine monomer with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0010] In a second aspect, the present invention provides a method for preparing a moisture-proof and antibacterial board for a cabinet as described in the first aspect, and the steps include: S1. Prepare the coating for the antibacterial coating: S1.1. Weigh and mix the raw material components according to their corresponding parts by weight; S1.2. Dissolve the flame-retardant polyurethane weighed in step S1.1 in a solvent, then add 1.54 - 1.7 parts by mass of 2,2-dimethoxy-2-phenylacetophenone, continue stirring for 10 - 20 min, and then add the composite antibacterial particles and stir until evenly dispersed to obtain the first mixed solution; S1.3. Add the antioxidant weighed in step S1.1 to the first mixed solution obtained in step S1.2, continue stirring for 15 - 25 min to obtain the coating for the antibacterial coating.

[0011] S2. Evenly apply the coating for the antibacterial coating prepared in step S1 on the outer surface of the substrate and cure it. During the curing process, irradiate with ultraviolet light for 7.5 - 8.5 h to obtain a moisture-proof and antibacterial board for a cabinet.

[0012] Further, the preparation steps of the flame-retardant polyurethane are as follows: Mix the flame-retardant polyol and diol, and vacuum dry at 100 - 110 °C for 1.5 - 2.5 h to remove moisture, then cool to 65 - 75 °C, add the diisocyanate monomer and 1 / 2 dibutyltin dilaurate, keep the temperature at 1.5 - 2.5 h under nitrogen protection, then cool to 45 - 55 °C, add the N,N-dimethylacetamide solution of oleyl alcohol and 1,4-butanediol, add 1 / 2 dibutyltin dilaurate, heat up to 65 - 75 °C, keep the temperature at 9 - 11 h under nitrogen protection, and perform rotary evaporation to obtain the flame-retardant polyurethane; wherein, the mass ratio of the flame-retardant polyol, diol, diisocyanate monomer, dibutyltin dilaurate, oleyl alcohol, and 1,4-butanediol is 1.34 - 2.69:12:2.52 - 3.02:0.1 - 0.12:0.1675 - 0.2025:0.5025 - 0.6075; wherein, the mass ratio of oleyl alcohol, 1,4-butanediol, and N,N-dimethylacetamide in the N,N-dimethylacetamide solution of oleyl alcohol and 1,4-butanediol is 0.1675 - 0.2025:0.5025 - 0.6075:10.

[0013] Further, the preparation steps of the flame-retardant polyol are as follows: Dissolve vanillin in ethanol, and then dropwise add an ethanol solution of a polyamine monomer with a mass percentage of 24 wt% - 26 wt% under nitrogen protection and at 60 - 70 °C. After the addition is complete, keep the temperature for reaction for 5.5 - 6.5 h, then add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and continue to keep the temperature and stir for 11 - 13 h. After the reaction is completed, dissolve it in dichloromethane with a mass 1.7 - 1.8 times that of vanillin, then pour it into ethanol with a mass 100 - 120 times that of vanillin for recrystallization and let it stand for 1.5 - 2.5 h, filter, wash it 2 - 4 times with deionized water, and then place it in a vacuum oven for drying to obtain the flame-retardant polyol; wherein, the molar ratio of vanillin, the amino group of the polyamine monomer, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1:1.

[0014] Further, the preparation steps of the composite antibacterial particles are as follows: (1) Disperse mesoporous titanium dioxide in 30% hydrogen peroxide, wherein the mass ratio of mesoporous titanium dioxide to hydrogen peroxide is 1:0.72 - 0.73. After stirring and reacting for 10 min, centrifuge, wash with water, and dry to obtain activated mesoporous titanium dioxide; Mix silver nitrate and deionized water at a mass ratio of 0.8 - 1.2:100, stir and dissolve, and then dropwise add 0.1 M ammonia water to the solution until it just becomes transparent while stirring to obtain a silver ammonia solution; Ultrasonically disperse 133 - 134 parts by mass of activated mesoporous titanium dioxide in 430 - 431 parts by mass of the silver ammonia solution, and then dropwise add 0.8 - 1.2 parts by mass of 0.15 M sodium dihydrogen phosphate solution dropwise under stirring. After the addition is complete, continue to stir for 25 - 35 min, then centrifuge, wash with water, wash with alcohol, and dry to obtain silver-loaded mesoporous titanium dioxide; The formation mechanism of silver compounds during the silver loading process is as follows: Ag + +2NH3·H2O=[Ag(NH3)2] + +2H2O; 3[Ag(NH3)2] + +PO4 3- =Ag3PO4+2NH3; (2) Dissolve 0.33 - 0.35 parts by mass of cetyltrimethylammonium bromide in a mixed solution of 105 - 106 parts by mass of 28% ammonia water, ethanol, and water to obtain a cetyltrimethylammonium bromide mixed solution. Among them, the volume ratio of ammonia water, ethanol, and water in the mixed solution of 28% ammonia water, ethanol, and water is 1:6 - 8:100; Disperse 0.5 part by mass of silver-loaded mesoporous titanium dioxide in 105.3 - 106.3 parts by mass of the cetyltrimethylammonium bromide mixed solution, and then add 3.3 - 3.4 parts by mass of tetraethyl orthosilicate and 0.77 - 0.79 parts by mass of (3-mercaptopropyl)trimethoxysilane under vigorous stirring at 1600 rpm. React at 50 - 60 °C for 23 - 25 h, then centrifuge at 5000 rpm for 10 min to separate the precipitate. After ultrasonic dispersion in 82.5 parts by mass of 2 mol / L hydrochloric acid ethanol solution at 50 °C for 15 min, wash with ethanol by centrifugation 5 times and then place in a vacuum drying oven at 70 °C for drying for 3 h to obtain composite antibacterial particles.

[0015] Further, the curing temperature is 75 - 85 °C, and the curing time is 23 - 25 h.

[0016] Further, the ultraviolet light uses UVA long-wave ultraviolet light.

[0017] Adopting the above technical solutions, the present invention has the following beneficial effects: The moisture-proof and antibacterial board for cabinets of the present invention includes a substrate and an antibacterial coating applied on the outer surface of the substrate. Among them, the coating material for the antibacterial coating, calculated by weight parts, the raw material components include composite antibacterial particles, flame-retardant polyurethane, antioxidant, and solvent; First, mix the composite antibacterial particles with flame-retardant polyurethane and solvent, and introduce 2,2-dimethoxy-2-phenylacetophenone for the first mixing, and then add the remaining raw material components to continue mixing to obtain the coating material for the antibacterial coating. The composite antibacterial particles are obtained by wrapping silver-loaded mesoporous titanium dioxide with mercapto-functionalized mesoporous silica; The flame-retardant polyurethane is obtained by polycondensing diisocyanate monomers, flame-retardant polyols, and diols and then end-capping with oleyl alcohol; The flame-retardant polyol is obtained by reacting vanillin and polyamine monomers and then grafting with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; The prepared moisture-proof and antibacterial board for cabinets has good waterproof and antibacterial properties and can effectively degrade formaldehyde in the environment under light conditions.

[0018] In the present invention, an intermediate containing multiple Schiff base bonds is formed by reacting the aldehyde group of vanillin with the amino group of a polyamine monomer. Then, a flame retardant intermediate, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, is added. Through the reaction and grafting of the P-H bond on 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with the Schiff base bond on the intermediate, a flame retardant polyol is formed. Then, a diisocyanate monomer, the flame retardant polyol, and a diol are polycondensed and terminated with oleyl alcohol to obtain a flame retardant polyurethane with a branched structure centered on the flame retardant polyol. A large number of cavities are formed in the flame retardant polyurethane. By introducing a flame retardant polyol containing a rigid benzene ring structure, the intermolecular interaction force is enhanced, the structural stability of the urethane group is improved, making it less likely to depolymerize, and it is also more conducive to improving the thermal stability of the polyurethane system. At the same time, the phosphorus-containing groups in the flame retardant polyol will generate phosphorus-rich carbon substances such as pyrophosphoric acid and metaphosphoric acid during pyrolysis, catalyzing the carbonization of the polyurethane matrix to form a carbon layer covering the surface of the matrix, thereby blocking the transfer of heat and substances inside the matrix. At the same time, the flame retardant polyol will decompose some non-combustible gases such as nitrogen, nitric oxide, and ammonia when heated, which can dilute the combustible gas and reduce the concentration of oxygen in the combustion zone, preventing the combustion reaction from continuing and helping to improve the flame retardant performance of the matrix; among them, using oleyl alcohol to terminate the polyurethane introduces a hydrophobic long carbon chain into the polyurethane to improve the hydrophobic and moisture-proof performance of the coating.

[0019] The antibacterial coating of the present invention introduces composite antibacterial particles obtained by wrapping silver-loaded mesoporous titanium dioxide with mercapto-functionalized mesoporous silica, that is, using cetyltrimethylammonium bromide as a template, tetraethyl orthosilicate and (3-mercaptopropyl)trimethoxysilane are co-condensed to wrap silver-loaded mesoporous titanium dioxide. Among them, silver-loaded mesoporous titanium dioxide is directly formed on the surface of mesoporous titanium dioxide by a liquid-phase precipitation method to form silver phosphate, which can effectively control the agglomeration problem of silver phosphate, ensure the performance of the coating, and prevent the occurrence of powder shedding. By adding composite antibacterial particles to introduce silver phosphate, the moisture-proof and antibacterial board for cabinets is given good antibacterial properties; the mesoporous structure on the surface of the composite antibacterial particles can adsorb formaldehyde in the air. The valence band potential position of silver phosphate is lower than that of titanium dioxide. Under light irradiation, the electrons on the valence band of silver phosphate are excited and transition to the conduction band. At the same time, holes are generated on the valence band. The holes on the valence band of silver phosphate will transfer to the valence band of titanium dioxide. The holes are quickly captured by titanium dioxide through the heterojunction formed between silver phosphate and titanium dioxide, and then, as the main active free radicals, participate in the photocatalytic oxidation and degradation of formaldehyde in the air to achieve the adsorption and degradation of formaldehyde.

[0020] In the present invention, composite antibacterial particles are first mixed with flame-retardant polyurethane and a solvent, and 2,2-dimethoxy-2-phenylacetophenone is introduced for the first mixing. Subsequently, the remaining raw material components are added and mixing is continued to obtain a coating material for an antibacterial coating. When the coating material for the antibacterial coating is applied to the outer surface of a substrate and cured, it is irradiated with ultraviolet light. The composite antibacterial particles are dispersed in the flame-retardant polyurethane through the cavities of the flame-retardant polyurethane. Under the photocatalytic action of 2,2-dimethoxy-2-phenylacetophenone, a thiol-ene click reaction occurs between the mercapto groups on the surface of the composite antibacterial particles and the unsaturated double bonds in the polyurethane, consuming the hydrophilic groups in the composite antibacterial particles and the flame-retardant polyurethane. The antibacterial particles are uniformly dispersed and firmly attached in the flame-retardant polyurethane, forming a dense micro-protrusion hydrophobic structure on the outer surface of the moisture-proof and antibacterial board for cabinets. While increasing the crosslinking density of the coating, the moisture-proof property of the moisture-proof and antibacterial board for cabinets is further enhanced, and no powder is shed after multiple frictions during use. Detailed implementation manners

[0021] To better understand the above technical solution, the following will provide a detailed description of the above technical solution in combination with specific implementation manners.

[0022] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0023] The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0024] The following are partial raw material components of the embodiments and comparative examples of the present invention: The diisocyanate monomer uses hexamethylene diisocyanate; The diol uses polycaprolactone diol (PCL-2000); The polyamine monomer is obtained by mixing tris(4-aminophenyl)amine and 4,4-diaminodiphenylmethane in a molar ratio of 1:3; The antioxidant uses antioxidant 1010; The substrate uses a density board; The solvent is N,N-dimethylacetamide; Mesoporous titanium dioxide: The average particle size is 4 μm, and the average pore diameter is 400 nm.

[0025] (Embodiment 1) A preparation method of a moisture-proof and antibacterial board for cabinets, the steps include: S1. Prepare a coating material for an antibacterial coating: S1.1. Weigh and mix the following raw material components according to their corresponding weight parts: 4 parts by mass of composite antibacterial particles, 10 parts by mass of flame-retardant polyurethane, 1 part by mass of antioxidant, and 77 parts by mass of solvent; S1.2. Dissolve the weighed flame-retardant polyurethane in a solvent, then add 1.54 parts by mass of 2,2-dimethoxy-2-phenylacetophenone, stir for 10 min, and then add composite antibacterial particles and stir to disperse evenly to obtain a first mixed solution; S1.3. Add the antioxidant weighed in step S1.1. to the first mixed solution obtained in step S1.2., and continue to stir for 15 min to obtain the coating for antibacterial coating.

[0026] S2. Uniformly coat the coating for antibacterial coating prepared in step S1. with a thickness of 20 μm on the outer surface of the substrate, cure at 75 °C for 23 h, and irradiate with ultraviolet light of 365 nm for 7.5 h during the curing process to obtain a moisture-proof and antibacterial board for cabinets.

[0027] The preparation steps of the flame-retardant polyurethane are as follows: Mix the flame-retardant polyol and diol, vacuum dry at 100 °C for 1.5 h to remove moisture, then cool to 65 °C, add diisocyanate monomer and 1 / 2 dibutyltin dilaurate, keep the temperature and react for 1.5 h under nitrogen protection, then cool to 45 °C, add oleyl alcohol and N,N-dimethylacetamide solution of 1,4-butanediol, add 1 / 2 dibutyltin dilaurate, raise the temperature to 65 °C, keep the temperature and react for 9 h under nitrogen protection, and perform rotary evaporation to obtain flame-retardant polyurethane; among them, the mass ratio of the flame-retardant polyol, diol, diisocyanate monomer, dibutyltin dilaurate, oleyl alcohol, and 1,4-butanediol is 1.34:12:2.52:0.1:0.1675:0.5025; among them, the mass ratio of oleyl alcohol, 1,4-butanediol, and N,N-dimethylacetamide in the N,N-dimethylacetamide solution of oleyl alcohol and 1,4-butanediol is 0.1675:0.5025:10.

[0028] The preparation steps of the flame-retardant polyol are as follows: Dissolve vanillin in ethanol, then dropwise add an ethanol solution of polyamine monomer with a mass percentage of 24 wt% drop by drop under nitrogen protection and at 60 °C, after dropping in 30 min, keep the temperature and react for 5.5 h, then add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, continue to keep the temperature and stir for 11 h, after the reaction is completed, dissolve it in dichloromethane with 1.7 times the mass of vanillin, then pour it into ethanol with 100 times the mass of vanillin for recrystallization and let it stand for 1.5 h, filter, wash with deionized water twice, and then put it into a vacuum oven at 80 °C to dry for 24 h to obtain the flame-retardant polyol; among them, the molar ratio of vanillin, amino group of polyamine monomer, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1:1.

[0029] The preparation steps of the composite antibacterial particles are as follows: (1) Disperse mesoporous titanium dioxide in 30% hydrogen peroxide, where the mass ratio of mesoporous titanium dioxide to hydrogen peroxide is 1:0.72. After stirring and reacting for 10 min, centrifuge, wash with water, and dry at 60 °C for 12 h to obtain activated mesoporous titanium dioxide. Mix silver nitrate and deionized water at a mass ratio of 0.8:100, stir and dissolve, and then dropwise add 0.1 M ammonia water while stirring until the solution just becomes transparent to obtain a silver ammonia solution. Ultrasonically disperse 133 parts by mass of activated mesoporous titanium dioxide in 430 parts by mass of the silver ammonia solution, and then dropwise add 0.8 part by mass of 0.15 M sodium dihydrogen phosphate solution drop by drop under stirring. After dropping is completed within 30 min, continue stirring for 25 min, and then centrifuge, wash with water, wash with alcohol, and dry at 60 °C to obtain silver-loaded mesoporous titanium dioxide; (2) Dissolve 0.33 part by mass of cetyltrimethylammonium bromide in a mixed solution of 105 - 106 parts by mass of 28% ammonia water, ethanol, and water to obtain a cetyltrimethylammonium bromide mixed solution, where the volume ratio of ammonia water, ethanol, and water in the mixed solution of 28% ammonia water, ethanol, and water is 1:6:100. Disperse 0.5 part by mass of silver-loaded mesoporous titanium dioxide in 105.3 parts by mass of the cetyltrimethylammonium bromide mixed solution, and then add 3.3 parts by mass of tetraethyl orthosilicate and 0.77 part by mass of (3-mercaptopropyl)trimethoxysilane under vigorous stirring at 1600 rpm. After reacting at 50 °C for 23 h, centrifuge at 5000 rpm for 10 min. The separated precipitate is ultrasonically dispersed in 82.5 parts by mass of 2 mol / L hydrochloric acid ethanol solution at 50 °C for 15 min, and then centrifuged and washed with ethanol 5 times and placed in a vacuum drying oven at 70 °C for drying for 3 h to obtain composite antibacterial particles.

[0030] (Example 2) A preparation method of a moisture-proof and antibacterial board for cabinets, the steps include: S1. Prepare the coating for the antibacterial coating: S1.1. Weigh and mix the following raw material components according to their corresponding parts by weight: 5 parts by weight of composite antibacterial particles, 12 parts by weight of flame-retardant polyurethane, 2 parts by weight of antioxidant, and 81 parts by weight of solvent; S1.2. Dissolve the flame-retardant polyurethane weighed in step S1.1 in the solvent, then add 1.62 parts by weight of 2,2-dimethoxy-2-phenylacetophenone, stir for 15 min, and then add the composite antibacterial particles and stir to disperse evenly to obtain a first mixed solution; S1.3. Add the antioxidant weighed in step S1.1 to the first mixed solution obtained in step S1.2, and continue to stir for 20 min to obtain the coating for the antibacterial coating.

[0031] S2. Uniformly coat the paint of the antibacterial coating prepared in step S1 with a thickness of 20 μm on the outer surface of the substrate, cure it at 80 °C for 24 h, and irradiate it with ultraviolet light of 365 nm for 8 h during the curing process to obtain a moisture-proof and antibacterial board for cabinets.

[0032] The preparation steps of the flame-retardant polyurethane are as follows: Mix the flame-retardant polyol and diol and vacuum dry them at 105 °C for 2 h to remove moisture, then cool to 70 °C, add the diisocyanate monomer and 1 / 2 dibutyltin dilaurate, keep the temperature and react for 2 h under nitrogen protection, then cool to 50 °C, add the oleyl alcohol and the N,N-dimethylacetamide solution of 1,4-butanediol, add 1 / 2 dibutyltin dilaurate, raise the temperature to 70 °C, keep the temperature and react for 10 h under nitrogen protection, and perform rotary evaporation to obtain the flame-retardant polyurethane; among them, the mass ratio of the flame-retardant polyol, diol, diisocyanate monomer, dibutyltin dilaurate, oleyl alcohol, and 1,4-butanediol is 2.02:12:2.77:0.11:0.185:0.555; among them, the mass ratio of oleyl alcohol, 1,4-butanediol, and N,N-dimethylacetamide in the N,N-dimethylacetamide solution of oleyl alcohol and 1,4-butanediol is 0.185:0.555:10.

[0033] The preparation steps of the flame-retardant polyol are as follows: Dissolve vanillin in ethanol, then dropwise add the ethanol solution of the polyamine monomer with a mass percentage of 25 wt% drop by drop under nitrogen protection and at 65 °C, finish dropping within 30 min, keep the temperature and react for 6 h, then add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, continue to keep the temperature and stir for 12 h, after the reaction is completed, dissolve it in dichloromethane with 1.75 times the mass of vanillin, then pour it into ethanol with 110 times the mass of vanillin for recrystallization and stand for 2 h, filter, wash it 3 times with deionized water, and then put it into a vacuum oven at 80 °C and dry it for 24 h to obtain the flame-retardant polyol; among them, the molar ratio of vanillin, the amino group of the polyamine monomer, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1:1.

[0034] The preparation steps of the composite antibacterial particles are as follows: (1) Disperse mesoporous titanium dioxide in 30% hydrogen peroxide, where the mass ratio of mesoporous titanium dioxide to hydrogen peroxide is 1:0.725. After stirring and reacting for 10 min, centrifuge, wash with water, and dry at 60 °C for 12 h to obtain activated mesoporous titanium dioxide. Mix silver nitrate and deionized water in a mass ratio of 1:100, stir and dissolve, and then dropwise add 0.1 M ammonia water while stirring until the solution becomes just transparent to obtain a silver ammonia solution. Ultrasonically disperse 133.5 parts by mass of activated mesoporous titanium dioxide in 430.5 parts by mass of the silver ammonia solution, and then dropwise add 1 part by mass of 0.15 M sodium dihydrogen phosphate solution drop by drop under stirring. After dropping is completed within 30 min, continue stirring for 30 min, then centrifuge, wash with water, wash with alcohol, and dry at 60 °C to obtain silver-loaded mesoporous titanium dioxide. (2) Dissolve 0.34 parts by mass of cetyltrimethylammonium bromide in a mixed solution of 105.5 parts by mass of 28% ammonia water, ethanol, and water, to obtain a cetyltrimethylammonium bromide mixed solution, where the volume ratio of ammonia water, ethanol, and water in the mixed solution of 28% ammonia water, ethanol, and water is 1:7:100. Disperse 0.5 parts by mass of silver-loaded mesoporous titanium dioxide in 105.8 parts by mass of the cetyltrimethylammonium bromide mixed solution, and then add 3.35 parts by mass of tetraethyl orthosilicate and 0.78 parts by mass of (3-mercaptopropyl)trimethoxysilane under vigorous stirring at 1600 rpm. After reacting at 55 °C for 24 h, centrifuge at 5000 rpm for 10 min. The separated precipitate is ultrasonically dispersed in 82.5 parts by mass of 2 mol / L hydrochloric acid ethanol solution at 50 °C for 15 min, then centrifuged and washed with ethanol 5 times, and then placed in a vacuum drying oven at 70 °C for drying for 3 h to obtain composite antibacterial particles.

[0035] (Example 3) A preparation method of a moisture-proof and antibacterial board for a cabinet, the steps include: S1. Prepare the coating for the antibacterial coating: S1.1. Weigh and mix the following raw material components according to their corresponding parts by weight: 6 parts by weight of composite antibacterial particles, 14 parts by weight of flame-retardant polyurethane, 3 parts by weight of antioxidant, and 85 parts by weight of solvent; S1.2. Dissolve the flame-retardant polyurethane weighed in step S1.1 in the solvent, then add 1.7 parts by weight of 2,2-dimethoxy-2-phenylacetophenone, stir for 20 min, and then add the composite antibacterial particles and stir until evenly dispersed to obtain a first mixed solution; S1.3. Add the antioxidant weighed in step S1.1 to the first mixed solution obtained in step S1.2, and continue stirring for 25 min to obtain the coating for the antibacterial coating.

[0036] S2. Uniformly coat the coating prepared in step S1 with a thickness of 20 μm on the outer surface of the substrate, cure it at 85 °C for 25 h, and irradiate it with ultraviolet light of 365 nm for 8.5 h during the curing process to obtain a moisture-proof and antibacterial board for cabinets.

[0037] The preparation steps of the flame-retardant polyurethane are as follows: Mix the flame-retardant polyol and diol, and vacuum dry them at 110 °C for 2.5 h to remove moisture. Then cool to 75 °C, add the diisocyanate monomer and 1 / 2 dibutyltin dilaurate, and carry out a heat-insulating reaction for 2.5 h under nitrogen protection. Then cool to 55 °C, add the N,N-dimethylacetamide solution of oleyl alcohol and 1,4-butanediol, add 1 / 2 dibutyltin dilaurate, heat up to 75 °C, and carry out a heat-insulating reaction for 11 h under nitrogen protection. Then carry out rotary evaporation to obtain the flame-retardant polyurethane; among them, the mass ratio of the flame-retardant polyol, diol, diisocyanate monomer, dibutyltin dilaurate, oleyl alcohol, and 1,4-butanediol is 2.69:12:3.02:0.12:0.2025:0.6075; among them, the mass ratio of oleyl alcohol, 1,4-butanediol, and N,N-dimethylacetamide in the N,N-dimethylacetamide solution of oleyl alcohol and 1,4-butanediol is 0.2025:0.6075:10.

[0038] The preparation steps of the flame-retardant polyol are as follows: Dissolve vanillin in ethanol, and then dropwise add the ethanol solution of the polyamine monomer with a mass percentage of 26 wt% drop by drop under nitrogen protection and at 70 °C. After dropping is completed within 30 min, carry out a heat-insulating reaction for 6.5 h, then add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and continue to carry out heat-insulating stirring for 13 h. After the reaction is completed, dissolve it in dichloromethane with 1.8 times the mass of vanillin, and then pour it into ethanol with 120 times the mass of vanillin for recrystallization and standing for 2.5 h. Filter, wash 4 times with deionized water, and then put it into a vacuum oven at 80 °C and dry for 24 h to obtain the flame-retardant polyol; among them, the molar ratio of vanillin, the amino group of the polyamine monomer, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1:1.

[0039] The preparation steps of the composite antibacterial particles are as follows: (1) Disperse mesoporous titanium dioxide in 30% hydrogen peroxide, where the mass ratio of mesoporous titanium dioxide to hydrogen peroxide is 1:0.73. After stirring and reacting for 10 min, centrifuge, wash with water, and dry at 60 °C for 12 h to obtain activated mesoporous titanium dioxide. Mix silver nitrate and deionized water in a mass ratio of 1.2:100, stir and dissolve, and then dropwise add 0.1 M ammonia water with stirring until the solution becomes just transparent to obtain a silver ammonia solution. Ultrasonically disperse 134 parts by mass of activated mesoporous titanium dioxide in 431 parts by mass of the silver ammonia solution, and then dropwise add 1.2 parts by mass of 0.15 M sodium dihydrogen phosphate solution dropwise with stirring. After dropping is completed within 30 min, continue stirring for 35 min, and then centrifuge, wash with water, wash with alcohol, and dry at 60 °C to obtain silver-loaded mesoporous titanium dioxide. (2) Dissolve 0.35 parts by mass of cetyltrimethylammonium bromide in a mixed solution of 106 parts by mass of 28% ammonia water, ethanol, and water to obtain a cetyltrimethylammonium bromide mixed solution, where the volume ratio of ammonia water, ethanol, and water in the mixed solution of 28% ammonia water, ethanol, and water is 1:8:100. Disperse 0.5 parts by mass of silver-loaded mesoporous titanium dioxide in 106.3 parts by mass of the cetyltrimethylammonium bromide mixed solution, and then add 3.4 parts by mass of tetraethyl orthosilicate and 0.79 parts by mass of (3-mercaptopropyl)trimethoxysilane under vigorous stirring at 1600 rpm. After reacting at 60 °C for 25 h, centrifuge at 5000 rpm for 10 min. The separated precipitate is ultrasonically dispersed in 82.5 parts by mass of 2 mol / L hydrochloric acid ethanol solution at 50 °C for 15 min, then centrifuged and washed with ethanol 5 times, and then placed in a vacuum drying oven at 70 °C for drying for 3 h to obtain composite antibacterial particles.

[0040] (Comparative Example 1) The difference between Comparative Example 1 and Example 2 is that the raw material components of the coating paint for the antibacterial coating in Comparative Example 1 include silver nitrate with an average particle size of 200 nm, flame-retardant polyurethane, antioxidant, and solvent; the other components and steps are the same as those in Example 2.

[0041] (Comparative Example 2) The difference between Comparative Example 2 and Example 2 is that the composite antibacterial particles in Comparative Example 2 are obtained by wrapping silver nitrate with an average particle size of 200 nm with mercapto-functionalized mesoporous silica, and the other components and steps are the same as those in Example 2.

[0042] (Comparative Example 3) The difference between Comparative Example 3 and Example 2 is that the composite antibacterial particles in Comparative Example 3 are silver-loaded mesoporous titanium dioxide, and the other components and steps are the same as those in Example 2.

[0043] (Comparative Example 4) The difference between Comparative Example 4 and Example 2 is that the composite antibacterial particles of Comparative Example 4 are silver-loaded titanium dioxide wrapped with mercapto-functionalized silica, and the other components and steps are the same as those of Example 2.

[0044] (Comparative Example 5) The difference between Comparative Example 5 and Example 2 is that the raw material components of the coating used for the antibacterial coating in Comparative Example 5 include composite antibacterial particles, polyurethane, antioxidant, solvent, and flame retardant; among them, the flame retardant uses 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide in the same mass parts as in Example 2, and the polyurethane is obtained by polycondensing diisocyanate monomers and diols and then end-capping with oleyl alcohol.

[0045] (Comparative Example 6) The difference between Comparative Example 6 and Example 2 is that the flame-retardant polyurethane in Comparative Example 6 is obtained by polycondensing diisocyanate monomers, flame-retardant polyols, and diols, and the other components and steps are the same as those of Example 2.

[0046] (Effect Example) Hydrophobic and moisture-proof property: The water contact angle of the moisture-proof and antibacterial wood-based panels for cabinets prepared in the examples and comparative examples was tested with 5 μL of water droplets. Table 1 shows the hydrophobic and moisture-proof property data of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Examples 1 to 6: Table 1

[0047] It can be seen from Table 1 that the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Example 2 have better hydrophobic and moisture-proof properties.

[0048] The difference between Comparative Example 1 and Example 2 is that the coating used for the antibacterial coating in Comparative Example 1 is silver nitrate instead of silver nitrate with silver-loaded mesoporous titanium dioxide wrapped with mercapto-functionalized mesoporous silica. The silver nitrate has a serious agglomeration phenomenon and there are a large number of defects such as pinholes, which affect the hydrophobic and moisture-proof properties.

[0049] The difference between Comparative Example 3 and Example 2 is that the composite antibacterial particles in Comparative Example 3 are silver-loaded mesoporous titanium dioxide and are not wrapped with mercapto-functionalized silica, and the hydrophobic and moisture-proof property is weaker than that of Example 2.

[0050] The difference between Comparative Example 6 and Example 2 is that the flame-retardant polyurethane in Comparative Example 6 does not introduce oleyl alcohol, and the mercapto groups of the composite antibacterial particles cannot be eliminated, and the hydrophobic and moisture-proof property is weaker than that of Example 2.

[0051] Antibacterial property: Escherichia coli was used as the bacterial strain, and the moisture-proof and antibacterial wood-based panels for cabinets prepared in the examples and comparative examples were tested by the plate method. Table 2 shows the antibacterial property data of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Examples 1 to 6: Table 2

[0052] As can be seen from Table 2, the antibacterial properties of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Examples 1 to 6 are good.

[0053] Flame retardancy: The limiting oxygen index (LOI) of the moisture-proof and antibacterial wood-based panels for cabinets prepared in the examples and comparative examples was tested with reference to ASTM D2863. Table 3 shows the flame retardancy data of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Examples 1 to 6: Table 3

[0054] As can be seen from Table 3, the flame retardancy of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3, Comparative Examples 1 to 4, and 6 is good.

[0055] The difference between Comparative Example 5 and Example 2 is that in the paint for the antibacterial coating of Comparative Example 5, the flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide was directly added instead of grafting the flame retardant polyol obtained by reacting vanillin and polyamine monomer and then reacting with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and its flame retardancy is worse than that of Example 2.

[0056] Formaldehyde elimination performance: The volume of the experimental reaction chamber is about 6 liters (20 cm × 20 cm × 15 cm), and the distance between the surface of the moisture-proof and antibacterial wood-based panel for cabinets and the quartz window at the top of the reaction chamber is about 10 cm. The reaction gas can only pass between the surface of the moisture-proof and antibacterial wood-based panel for cabinets and the air inlet and outlet of the reaction chamber; during the photocatalytic reaction process, simulated sunlight will be provided vertically outside the reaction chamber; the moisture-proof and antibacterial wood-based panels for cabinets in the examples and comparative examples will be placed in the reaction chamber, and gas formaldehyde with a concentration of about 100 ppm will be introduced. The 500 W xenon lamp will be turned on, and the change in formaldehyde concentration within 60 minutes will be measured with a formaldehyde detector, and it will be measured once every 10 seconds on average. The formaldehyde concentration is estimated according to the following formula:

[0057] Among them, ρ represents the density of formaldehyde, v1 is the volume of the initially added liquid formaldehyde solution (milliliters), c(wt)% is the concentration of formaldehyde, k = 1.25 is the conversion coefficient, and v2 is the volume of the container (cubic meters).

[0058] Table 4 shows the formaldehyde elimination performance data of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Examples 1 to 6: Table 4

[0059] As can be seen from Table 4, the formaldehyde elimination performance of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Example 6 is relatively good.

[0060] The difference between Comparative Example 1 and Example 2 is that the coating used in the antibacterial coating of Comparative Example 1 is silver nitrate instead of silver nitrate with silver-loaded mesoporous titania encapsulated by thiol-functionalized mesoporous silica. The silver nitrate agglomeration is relatively serious, the light is uneven, and the formaldehyde elimination performance is poor.

[0061] The difference between Comparative Example 2 and Example 2 is that the composite antibacterial particles of Comparative Example 2 are obtained by encapsulating silver nitrate with an average particle size of 200 nm by thiol-functionalized mesoporous silica, and the formaldehyde elimination performance is worse than that of Example 2.

[0062] The difference between Comparative Example 3 and Example 2 is that the composite antibacterial particles of Comparative Example 3 are silver-loaded mesoporous titania, without being encapsulated by thiol-functionalized mesoporous silica, with fewer mesopores and poor formaldehyde elimination performance.

[0063] The difference between Comparative Example 4 and Example 2 is that the composite antibacterial particles of Comparative Example 4 are silver-loaded titania encapsulated by thiol-functionalized silica, and there is no mesopore to adsorb formaldehyde, and the formaldehyde elimination performance is poor.

[0064] The difference between Comparative Example 5 and Example 2 is that the flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is directly added to the coating used in the antibacterial coating of Comparative Example 5 instead of being grafted with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide after the reaction of vanillin and polyamine monomers. It only relies on the mesopores of the composite antibacterial particles for adsorption, and the formaldehyde elimination performance is worse than that of Example 2.

[0065] Powder shedding test: Press the surface of the moisture-proof and antibacterial wood-based panels for cabinets prepared in the examples and comparative examples with a gloved hand 10 times back and forth, and observe visually whether there is powder shedding or powder sticking to the latex glove.

[0066] Table 5 shows the powder shedding test data of the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Examples 1 to 6: Table 5

[0067] As can be seen from Table 5, the moisture-proof and antibacterial wood-based panels for cabinets prepared in Examples 1 to 3 and Comparative Examples 2, 4 to 6 do not shed powder.

[0068] The difference between Comparative Example 1 and Example 2 is that the coating used in the antibacterial coating of Comparative Example 1 is silver nitrate instead of silver nitrate with silver-loaded mesoporous titania encapsulated by thiol-functionalized mesoporous silica. The silver nitrate agglomeration is relatively serious, the binding ability with the coating base material is poor, and the powder shedding phenomenon is serious.

[0069] The difference between Comparative Example 3 and Example 2 is that the composite antibacterial particles in Comparative Example 3 are silver-loaded mesoporous titanium dioxide, and the silver-loaded mesoporous titanium dioxide is not coated with mercapto-functionalized mesoporous silica. The silver-loaded mesoporous titanium dioxide shows little aggregation in the coating, but the adhesion between the silver-loaded mesoporous titanium dioxide and the flame-retardant polyurethane is weak, resulting in slight powder shedding.

[0070] The difference between Comparative Example 6 and Example 2 is that the flame-retardant polyurethane in Comparative Example 6 is not capped with oleyl alcohol, and thus the thiol-ene click reaction cannot be carried out as in Comparative Example 3. However, the slight powder shedding phenomenon in Comparative Example 3 does not occur. This may be because hydrogen bonds and other groups are formed between the thiol groups on the surface of the composite antibacterial particles in Comparative Example 6 and some groups in the flame-retardant polyurethane such as urethane, making the adhesion of the composite antibacterial particles in the flame-retardant polyurethane greater than that in Comparative Example 3.

[0071] In summary, the moisture-proof and antibacterial board for cabinets of the present invention includes a substrate and an antibacterial coating coated on the outer surface of the substrate. Among them, the raw material components of the coating for the antibacterial coating include composite antibacterial particles, flame-retardant polyurethane, antioxidant, and solvent; the composite antibacterial particles are obtained by coating silver-loaded mesoporous titanium dioxide with mercapto-functionalized mesoporous silica; the flame-retardant polyurethane is obtained by polycondensing diisocyanate monomers, flame-retardant polyols, and diols and then capping with oleyl alcohol; the flame-retardant polyol is obtained by grafting the reaction product of vanillin and polyamine monomers with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. Under the synergistic effect of the components and structures of the above raw material components, the prepared moisture-proof and antibacterial board for cabinets has good waterproof and antibacterial properties and can effectively degrade formaldehyde in the environment under light conditions.

[0072] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A moisture-proof and antibacterial board for cabinets, comprising a substrate and an antibacterial coating coated on the outer surface of the substrate, characterized in that: The coating for antibacterial coating comprises raw material components, by weight, of 4 to 6 parts by weight of composite antibacterial particles, 10 to 14 parts by weight of flame-retardant polyurethane, 1 to 3 parts by weight of antioxidant, and 77 to 85 parts by weight of solvent. The composite antibacterial particles are first mixed with the flame-retardant polyurethane and the solvent, and 2,2-dimethoxy-2-phenylacetophenone is introduced for the first mixing, and then the remaining raw material components are added and continued to be mixed to obtain the coating.

2. The moisture-proof and antibacterial sheet material for cabinets according to claim 1, characterized in that: The composite antibacterial particles are obtained by wrapping silver-loaded mesoporous titanium dioxide with mercapto-functionalized mesoporous silicon dioxide.

3. The moisture-proof and antibacterial sheet material for cabinets according to claim 1, characterized in that: The flame retardant polyurethane is obtained by polycondensing diisocyanate monomers, flame retardant polyols and diols and then capping with oleyl alcohol.

4. The moisture-proof and antibacterial sheet material for cabinets according to claim 3, characterized in that: The flame retardant polyol is obtained by reacting vanillin and polyamine monomers and grafting them with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

5. A method for preparing a moisture-proof and antibacterial sheet material for cabinets according to any one of claims 1 to 4, characterized in that the steps include: S1. Preparation of coating for antibacterial coating: S1.

1. Weigh and prepare each raw material component according to its corresponding weight proportion; S1.

2. Dissolve the flame-retardant polyurethane weighed in step S1.1 in a solvent, then add 1.54 to 1.7 parts by mass of 2,2-dimethoxy-2-phenylacetophenone, continue stirring for 10 to 20 minutes, then add the composite antibacterial particles and stir to disperse evenly to obtain a first mixed solution; S1.

3. Add the antioxidant weighed in step S1.1 to the first mixed solution obtained in step S1.2, and continue stirring for 15 to 25 minutes to obtain an antibacterial coating; S2. The antibacterial coating prepared in step S1. is evenly coated on the outer surface of the substrate and cured. During the curing period, ultraviolet light is irradiated for 7.5 to 8.5 hours to obtain a moisture-proof antibacterial sheet for cabinets.

6. The method for preparing the moisture-proof and antibacterial sheet material for cabinets according to claim 5, characterized in that: The preparation steps of the flame retardant polyurethane are as follows: the flame retardant polyol and the diol are mixed and vacuum dried at 100-110° C. for 1.5-2.5 hours to remove moisture, then cooled to 65-75° C., diisocyanate monomer and 1 / 2 dibutyltin dilaurate are added, and the mixture is kept warm for reaction under nitrogen protection for 1.5-2.5 hours, then cooled to 45-55° C., oleyl alcohol and N,N-dimethylacetamide solution of 1,4-butanediol are added, 1 / 2 dibutyltin dilaurate is added, the mixture is heated to 65-75° C., the mixture is kept warm for reaction under nitrogen protection for 9-11 hours, and rotary evaporation is performed to obtain to flame retardant polyurethane; wherein, the mass ratio of flame retardant polyol, diol, diisocyanate monomer, dibutyltin dilaurate, oleyl alcohol and 1,4-butanediol is 1.34~2.69:12:2.52~3.02:0.1~0.12:0.1675~0.2025:0.5025~0.6075; wherein, the mass ratio of oleyl alcohol, 1,4-butanediol and N,N-dimethylacetamide in the N,N-dimethylacetamide solution of oleyl alcohol and 1,4-butanediol is 0.1675~0.2025:0.5025~0.6075:

10.

7. The method for preparing the moisture-proof and antibacterial sheet material for cabinets according to claim 6, characterized in that: The flame retardant polyol is prepared as follows: vanillin is dissolved in ethanol, and then an ethanol solution of a polyamine monomer with a mass percentage of 24wt% to 26wt% is added dropwise under nitrogen protection and 60 to 70°C, and after the addition is completed, the solution is kept warm for reaction for 5.5 to 6.5 hours, and then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the solution is kept warm and stirred for 11 to 13 hours. After the reaction is completed, the solution is dissolved in dichloromethane with a mass of 1.7 to 1.8 times that of the vanillin, and then the solution is poured into ethanol with a mass of 100 to 120 times that of the vanillin for recrystallization and allowed to stand for 1.5 to 2.5 hours, filtered, washed with deionized water for 2 to 4 times, and then dried in a vacuum oven to obtain a flame retardant polyol; wherein the molar ratio of vanillin, amino group of the polyamine monomer, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1:

1.

8. The method for preparing the moisture-proof and antibacterial board for cabinets according to claim 5, characterized in that: The preparation steps of the composite antibacterial particles are as follows: (1) Dispersing mesoporous titanium dioxide in 30% hydrogen peroxide, wherein the mass ratio of mesoporous titanium dioxide to hydrogen peroxide is 1:0.72-0.73, stirring for 10 minutes, centrifuging, washing with water, and drying to obtain activated mesoporous titanium dioxide; mixing silver nitrate and deionized water in a mass ratio of 0.8-1.2:100, stirring and dissolving, then adding 0.1M ammonia water dropwise while stirring until the solution is just transparent to obtain a silver ammonia solution; ultrasonically dispersing 133-134 parts by mass of the activated mesoporous titanium dioxide in 430-431 parts by mass of the silver ammonia solution, then adding 0.8-1.2 parts by mass of 0.15M sodium dihydrogen phosphate solution dropwise while stirring, continuing to stir for 25-35 minutes after the addition is complete, then centrifuging, washing with water, washing with alcohol, and drying to obtain silver-loaded mesoporous titanium dioxide; (2) dissolving 0.33-0.35 parts by weight of hexadecyltrimethylammonium bromide in 105-106 parts by weight of a mixed solution of 28% ammonia water, ethanol and water to obtain a hexadecyltrimethylammonium bromide mixed solution, wherein the volume ratio of ammonia water, ethanol and water in the mixed solution of 28% ammonia water, ethanol and water is 1:6-8:100; dispersing 0.5 parts by weight of silver-loaded mesoporous titanium dioxide in 105.3-106.3 parts by weight of the hexadecyltrimethylammonium bromide mixed solution, and then heating at 1600 r. 3.3-3.4 parts by mass of tetraethyl orthosilicate and 0.77-0.79 parts by mass of (3-mercaptopropyl)trimethoxysilane were added under vigorous stirring at 50-60°C, reacted for 23-25 ​​hours, and then centrifuged at 5000 rpm for 10 minutes. The separated precipitate was ultrasonically dispersed with 82.5 parts by mass of 2 mol / L hydrochloric acid ethanol solution at 50°C for 15 minutes, washed five times by centrifugation with ethanol, and dried in a vacuum drying oven at 70°C for 3 hours to obtain composite antibacterial particles.

9. The method for preparing the moisture-proof and antibacterial sheet material for cabinets according to claim 5, characterized in that: The curing temperature is 75-85° C., and the curing time is 23-25 ​​hours.

10. The method for preparing the moisture-proof and antibacterial board for cabinets according to claim 5, characterized in that: The ultraviolet light adopts UVA long-wave ultraviolet light.

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