Mildew-proof composite board for wardrobe and preparation method thereof

Abstract

The present application relates to the technical field of artificial board, and discloses a kind of mould-proof composite board for wardrobe and a preparation method thereof.The composite board for wardrobe prepared by the present application is prepared by using rubberwood sheet as main raw material, impregnating treatment with mould-proof and antibacterial agent, and then adhesive treatment with adhesive containing mould-proof and antibacterial agent.The composite board realizes long-term inhibition of mould through multi-mechanism sterilization of components, synergistic effect and material level protection, and is suitable for wardrobe application in high-humidity environment.In addition, the use of mould-proof and antibacterial adhesive also endows the composite board with excellent bonding strength.

Description

Technical Field

[0001] This invention relates to the field of engineered wood products technology, specifically to a mildew-resistant composite board for wardrobes and its preparation method. Background Technology

[0002] Wooden furniture (especially wardrobes) is susceptible to mold in humid environments, leading to material deterioration, odor, and health risks (such as respiratory irritation or allergic reactions). Rubberwood, due to its porous structure and high sugar content, has an economic advantage but is more prone to moisture absorption and mold growth. Traditional anti-mold methods (such as surface coating with organotin, quaternary ammonium salts, or boric acid anti-mold agents) have significant drawbacks: (1) Short-term effectiveness: Surface treatment agents are easily washed away by wiping, abrasion, or water rinsing, making it difficult to provide long-term protection; (2) Toxicity risks: Some anti-mold agents (such as organotin) are neurotoxic to mammals, limiting their application in home settings; (3) Resistance risks: Long-term use of anti-mold agents with a single mechanism of action can easily induce mold resistance, leading to protection failure.

[0003] To improve mold resistance, the industry has attempted to enhance the properties of wood-based substrates through physical modification (such as high-temperature carbonization to reduce wood's hygroscopicity) or chemical compounding (such as resin impregnation to enhance hydrophobicity), and has also incorporated mold inhibitors into adhesive systems. However, these methods suffer from drawbacks such as low cost-effectiveness, insufficient penetration, limited functionality, poor compatibility of mold inhibitors, and uncontrollable dynamic release. Therefore, researchers need to develop a mold-resistant composite board for wardrobes that offers excellent mold resistance, high cost-effectiveness, and controllable dynamic release to meet market demands. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a composite board for mildew-resistant wardrobes and its preparation method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A mildew-resistant composite board for wardrobes, wherein the mildew-resistant composite board for wardrobes is formed by bonding 5-8 layers of mildew-resistant rubberwood veneers with a mildew-resistant and antibacterial adhesive.

[0007] The mildew-resistant rubberwood veneer is prepared by impregnating rubberwood veneer with an anti-mildew and antibacterial agent in an aqueous ethanol solution.

[0008] Furthermore, the rubberwood veneer has a thickness of 2-3 mm;

[0009] Furthermore, the antifungal and antibacterial agent ethanol aqueous solution is prepared by ultrasonically dispersing the antifungal and antibacterial agent in an ethanol aqueous solution, wherein the mass fraction of the antifungal and antibacterial agent is 0.5-1%, and the volume ratio of ethanol to water in the ethanol aqueous solution is 8:2;

[0010] Furthermore, the curing agent is triethylenetetramine, the curing accelerator is the organic urea accelerator DYHARD UR300, the silane coupling agent is KH-550, and the diluent is benzyl alcohol;

[0011] The anti-mildew and antibacterial adhesive comprises the following raw materials in parts by weight: 40-50 parts of bisphenol A epoxy resin, 10-16 parts of polyurethane modified epoxy resin, 12-20 parts of curing agent, 2-5 parts of curing accelerator, 3-6 parts of anti-mildew and antibacterial agent, 5-9 parts of nano calcium carbonate, 0.5-2 parts of silane coupling agent, and 1-3 parts of diluent.

[0012] The antifungal and antibacterial agent is prepared by the following steps:

[0013] Step A1: Stir 1,2,7,8-diepoxyoctane in DMF (N,N-dimethylformamide) until homogeneous, add imidazole, and heat to 70-90℃ for 3-5 hours. Distill under reduced pressure, wash, and dry to obtain the imidazole derivative.

[0014] Further, in step A1, the molar ratio of 1,2,7,8-diepoxyoctane to imidazole is 1.01-1.03:1;

[0015] Step A2: Mix the imidazole derivative and mercaptoethylamine in ethanol, purge with nitrogen, reflux and stir for 12 h, add n-hexane and stir for 30 min, let stand for 3 h, remove the supernatant, and rotary evaporate to obtain mercapto-imidazole.

[0016] Furthermore, in step A2, the molar ratio of the imidazole derivative and mercaptoethylamine is 1:1;

[0017] Furthermore, in step A2, the volume ratio of ethanol to n-hexane is 1:5;

[0018] Step A3: After stirring the 20wt% zinc sulfate aqueous solution evenly, heat it to 40-50℃, slowly add 20.0wt%-20.5wt% mercaptoimidazole aqueous solution, maintain the temperature for 2-3 hours, filter, wash and dry to obtain the imidazole-zinc complex.

[0019] Furthermore, in step A3, the molar ratio of zinc sulfate to thiolated imidazole is 1:1.7-2.3;

[0020] Step A4: Mix 3-bromopropyne, sodium hydroxide and DMF evenly, add imidazole-zinc complex, heat to 35-45℃ and stir for 12-24 hours, wash, dry and purify by column chromatography to obtain antifungal and antibacterial agent;

[0021] Furthermore, in step A4, the molar ratio of 3-bromopropyne, sodium hydroxide, and imidazole-zinc complex is 1-2:3.5-4:5-7.

[0022] A method for preparing a mildew-resistant composite board for wardrobes includes the following steps:

[0023] Step S1: Weigh the raw materials according to the weight parts, mix and stir the bisphenol A epoxy resin, polyurethane modified epoxy resin, anti-mildew and antibacterial agent, nano calcium carbonate and silane coupling agent evenly, add curing agent and curing accelerator and stir for 30 minutes, then add diluent and stir for 10 minutes to obtain anti-mildew and antibacterial adhesive.

[0024] Step S2: Place the dried rubberwood sheets in a container and press a heavy object on top. Then place it under vacuum for 1 hour. Add an anti-mildew and antibacterial ethanol aqueous solution until the rubberwood sheets are completely submerged. Soak for 24 hours, then remove and air dry to obtain anti-mildew rubberwood sheets.

[0025] Step S3: Spray anti-mold and antibacterial adhesive onto the surface of the anti-mold rubberwood veneer, with a single-sided spraying amount of 130g / m². 2 After the spraying is completed, 5-8 layers of anti-mildew rubberwood sheets are stacked and hot-pressed at 120-130℃ and 3MPa for 15-25 minutes, and then cold-pressed at 1.2MPa for 12-20 hours to obtain anti-mildew composite board for wardrobes.

[0026] The beneficial effects of this invention are:

[0027] The composite board for wardrobes prepared by this invention uses rubberwood veneer as the main raw material, impregnates it with an anti-mildew and antibacterial agent, and then bonds it with an adhesive containing the anti-mildew and antibacterial agent. The composite board achieves long-term inhibition of mold through multi-mechanism sterilization, synergistic effect and material-level protection, making it suitable for wardrobe applications in high humidity environments. In addition, the use of anti-mildew and antibacterial adhesive also gives the composite board excellent bonding strength.

[0028] The antifungal and antibacterial agent prepared in this invention imparts excellent antifungal effects to composite boards through the synergistic effect of the imidazole structure, zinc ions, and propyne groups. Specifically, the imidazole structure inhibits the biosynthesis of ergosterol in mold cell membranes, disrupting cell membrane integrity and causing leakage of cell contents, thereby inhibiting mold growth and blocking energy metabolism, ultimately killing the mold. The zinc complex contained in the antifungal and antibacterial agent slowly and continuously releases zinc ions in humid environments. These zinc ions bind to thiol groups (-SH) within mold cells, disrupting the activity of oxidoreductases (such as dehydrogenases) and interfering with cell metabolism. The slow-release properties of the zinc complex prolong the release of zinc ions. 2+This enhances the effective action time of imidazole and improves its dispersibility in wood, preventing aggregation and failure caused by excessively high local concentrations. The propyne groups it contains also synergistically interact with metal ions. The stereochemical structure of the propyne groups allows them to penetrate the cell walls of molds and fungi, enhancing the permeability of metal ions to the cell walls and thus effectively preventing the growth of molds and fungi. Furthermore, the zinc complex enhances the dispersibility of imidazole, while the cross-linking effect of propyne fixes the antifungal agent, forming a dynamic balance of "storage-release" and extending its shelf life.

[0029] The composite board in this invention is impregnated with an anti-mold and antibacterial agent. The components penetrate into the pores of the wood, directly protecting the fiber structure and inhibiting internal mold growth. The anti-mold and antibacterial adhesive layer not only bonds the thin sheet, but its curing network also encapsulates and slowly releases the anti-mold agent, ensuring continuous antibacterial action at the joints. The hydrophobicity of the adhesive layer itself also reduces moisture intrusion, weakening the environment for mold growth. In turn, the multi-layer composite structure forms a physical barrier, which, combined with the chemical protection of the anti-mold agent, achieves all-round anti-mold protection from the inside out. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: The antifungal and antibacterial agent was prepared by the following steps:

[0032] Step A1: Stir 0.101 mol of 1,2,7,8-dicyclooxyoctane in 200 mL of DMF until homogeneous, add 0.1 mol of imidazole, and heat to 70 °C for 3 h. Distill under reduced pressure, wash, and dry to obtain the imidazole derivative.

[0033] Step A2: Mix 0.1 mol of imidazole derivative and 0.1 mol of mercaptoethylamine in 100 mL of ethanol, purge with nitrogen, reflux and stir for 12 h, add 500 mL of n-hexane and stir for 30 min, let stand for 3 h, remove the supernatant, and rotary evaporate to obtain mercapto-imidazole.

[0034] Step A3: After stirring the 20wt% zinc sulfate aqueous solution evenly, heat it to 40℃, slowly add 20.0wt% mercaptoimidazole aqueous solution, maintain the temperature for 2 hours, filter, wash and dry to obtain the imidazole-zinc complex. The molar ratio of zinc sulfate to mercaptoimidazole is 1:1.7.

[0035] Step A4: Mix 0.1 mol 3-bromopropyne, 0.35 mol sodium hydroxide and 200 mL DMF until homogeneous, add 0.5 mol imidazole-zinc complex, heat to 35℃ and stir for 12 h, wash, dry and purify by column chromatography to obtain the antifungal and antibacterial agent.

[0036] Example 2: The antifungal and antibacterial agent was prepared by the following steps:

[0037] Step A1: Stir 0.102 mol of 1,2,7,8-diepoxyoctane in 200 mL of DMF until homogeneous, add 0.1 mol of imidazole, and heat to 80 °C for 4 h. Distill under reduced pressure, wash, and dry to obtain the imidazole derivative.

[0038] Step A2: Mix 0.1 mol of imidazole derivative and 0.1 mol of mercaptoethylamine in 100 mL of ethanol, purge with nitrogen, reflux and stir for 12 h, add 500 mL of n-hexane and stir for 30 min, let stand for 3 h, remove the supernatant, and rotary evaporate to obtain mercapto-imidazole.

[0039] Step A3: After stirring the 20wt% zinc sulfate aqueous solution evenly, heat it to 45℃, slowly add 20.2wt% mercaptoimidazole aqueous solution, maintain the temperature for 2.5h, filter, wash and dry to obtain the imidazole-zinc complex. The molar ratio of zinc sulfate to mercaptoimidazole is 1:2.

[0040] Step A4: Mix 0.15 mol 3-bromopropyne, 0.37 mol sodium hydroxide and 200 mL DMF until homogeneous, add 0.6 mol imidazole-zinc complex, heat to 40 °C and stir for 18 h, wash, dry and purify by column chromatography to obtain the antifungal and antibacterial agent.

[0041] Example 3: The antifungal and antibacterial agent was prepared by the following steps:

[0042] Step A1: Stir 0.103 mol of 1,2,7,8-dicyclooxyoctane in 200 mL of DMF until homogeneous, add 0.1 mol of imidazole, heat to 90 °C and react for 5 h, then distill under reduced pressure, wash and dry to obtain the imidazole derivative.

[0043] Step A2: Mix 0.1 mol of imidazole derivative and 0.1 mol of mercaptoethylamine in 100 mL of ethanol, purge with nitrogen, reflux and stir for 12 h, add 500 mL of n-hexane and stir for 30 min, let stand for 3 h, remove the supernatant, and rotary evaporate to obtain mercapto-imidazole.

[0044] Step A3: After stirring the 20wt% zinc sulfate aqueous solution evenly, heat it to 50℃, slowly add 20.5wt% mercaptoimidazole aqueous solution, maintain the temperature for 3h, filter, wash and dry to obtain the imidazole-zinc complex. The molar ratio of zinc sulfate to mercaptoimidazole is 1:2.3.

[0045] Step A4: Mix 0.2 mol 3-bromopropyne, 0.4 mol sodium hydroxide and 200 mL DMF until homogeneous, add 0.7 mol imidazole-zinc complex, heat to 45℃ and stir for 24 h, wash, dry and purify by column chromatography to obtain the antifungal and antibacterial agent.

[0046] Example 4: A method for preparing a mildew-resistant composite board for wardrobes includes the following steps:

[0047] Step S1: Weigh the raw materials according to the weight parts, mix 40 parts of bisphenol A epoxy resin E51, 10 parts of polyurethane modified epoxy resin (EPU 133S), 3 parts of the antifungal and antibacterial agent prepared in Example 1, 5 parts of nano calcium carbonate and 0.5 parts of silane coupling agent KH550 evenly, add 12 parts of triethylenetetramine and 2 parts of organic urea accelerator DYHARD UR300 and stir for 30 min, then add 1 part of benzyl alcohol and stir for 10 min to obtain the antifungal and antibacterial adhesive;

[0048] Step S2: Place a 2mm thick dry rubberwood sheet in a container, press a heavy object on top, and then keep it under vacuum for 1 hour. Then add the antifungal and antibacterial agent ethanol aqueous solution prepared in Example 1 until the rubberwood sheet is completely submerged. Soak for 24 hours, take it out, and air dry to obtain the antifungal rubberwood sheet. The antifungal and antibacterial agent ethanol aqueous solution prepared in Example 1 is prepared by ultrasonic dispersion of the antifungal and antibacterial agent prepared in Example 1 in ethanol aqueous solution. The mass fraction of the antifungal and antibacterial agent prepared in Example 1 is 0.5%, and the volume ratio of ethanol to water in the ethanol aqueous solution is 8:2.

[0049] Step S3: Spray anti-mold and antibacterial adhesive onto the surface of the anti-mold rubberwood veneer, with a single-sided spraying amount of 130g / m². 2 After the spraying is completed, five layers of anti-mildew rubberwood sheets are stacked and hot-pressed at 120℃ and 3MPa for 15 minutes, and then cold-pressed at 1.2MPa for 12 hours to obtain the anti-mildew composite board for wardrobes.

[0050] Example 5: A method for preparing a mildew-resistant composite board for wardrobes includes the following steps:

[0051] Step S1: Weigh the raw materials according to the weight parts, mix 45 parts of bisphenol A epoxy resin E51, 13 parts of polyurethane modified epoxy resin (EPU 133S), 4.5 parts of the antifungal and antibacterial agent prepared in Example 2, 7 parts of nano calcium carbonate and 1 part of silane coupling agent KH550 evenly, add 16 parts of triethylenetetramine and 3.5 parts of organic urea accelerator DYHARD UR300 and stir for 30 min, then add 2 parts of benzyl alcohol and stir for 10 min to obtain the antifungal and antibacterial adhesive;

[0052] Step S2: Place a 2.5 mm thick dry rubberwood sheet in a container, press a heavy object on top, and then keep it under vacuum for 1 hour. Then add the antifungal and antibacterial agent ethanol aqueous solution prepared in Example 2 until the rubberwood sheet is completely submerged. Soak for 24 hours, take it out, and air dry to obtain the antifungal rubberwood sheet. The antifungal and antibacterial agent ethanol aqueous solution prepared in Example 2 is prepared by ultrasonic dispersion of the antifungal and antibacterial agent in ethanol aqueous solution. The mass fraction of the antifungal and antibacterial agent prepared in Example 2 is 0.75%, and the volume ratio of ethanol to water in the ethanol aqueous solution is 8:2.

[0053] Step S3: Spray anti-mold and antibacterial adhesive onto the surface of the anti-mold rubberwood veneer, with a single-sided spraying amount of 130g / m². 2 After the spraying is completed, seven layers of anti-mildew rubberwood sheets are stacked and hot-pressed at 125℃ and 3MPa for 20 minutes, and then cold-pressed at 1.2MPa for 16 hours to obtain the anti-mildew composite board for wardrobes.

[0054] Example 6: A method for preparing a mildew-resistant composite board for wardrobes includes the following steps:

[0055] Step S1: Weigh the raw materials according to the weight parts, mix 50 parts of bisphenol A epoxy resin E51, 16 parts of polyurethane modified epoxy resin (EPU 133S), 6 parts of the antifungal and antibacterial agent prepared in Example 3, 9 parts of nano calcium carbonate and 2 parts of silane coupling agent KH550 evenly, add 20 parts of triethylenetetramine and 5 parts of organic urea accelerator DYHARD UR300 and stir for 30 min, then add 3 parts of benzyl alcohol and stir for 10 min to obtain the antifungal and antibacterial adhesive;

[0056] Step S2: Place a 3mm thick dry rubberwood sheet in a container, press a heavy object on top, and then keep it under vacuum for 1 hour. Then add the anti-mildew and antibacterial agent ethanol aqueous solution prepared in Example 3 until the rubberwood sheet is completely submerged. Soak for 24 hours, take it out, and air dry to obtain the anti-mildew rubberwood sheet. The anti-mildew and antibacterial agent ethanol aqueous solution prepared in Example 3 is prepared by ultrasonic dispersion of the anti-mildew and antibacterial agent prepared in Example 3 in ethanol aqueous solution. The mass fraction of the anti-mildew and antibacterial agent prepared in Example 3 is 1%, and the volume ratio of ethanol to water in the ethanol aqueous solution is 8:2.

[0057] Step S3: Spray anti-mold and antibacterial adhesive onto the surface of the anti-mold rubberwood veneer, with a single-sided spraying amount of 130g / m². 2 After the spraying is completed, eight layers of anti-mildew rubberwood sheets are stacked and hot-pressed at 130℃ and 3MPa for 25 minutes, and then cold-pressed at 1.2MPa for 20 hours to obtain the anti-mildew composite board for wardrobes.

[0058] Comparative Example 1: This comparative example is a composite board for mildew-proof wardrobes. The difference between this example and Example 6 is that a commercially available mildew inhibitor (n-octylisothiazolinone) is used instead of the mildew-proof and antibacterial agent prepared in Example 3. All other aspects are the same.

[0059] Comparative Example 2: This comparative example is a composite board for mold-resistant wardrobes. The difference from Example 6 is that the rubberwood veneer was not treated with mold prevention. The specific preparation method includes the following steps:

[0060] Step S1: Weigh the raw materials according to the weight parts, mix 50 parts of bisphenol A epoxy resin E51, 16 parts of polyurethane modified epoxy resin (EPU 133S), 6 parts of the antifungal and antibacterial agent prepared in Example 3, 9 parts of nano calcium carbonate and 2 parts of silane coupling agent KH550 evenly, add 20 parts of triethylenetetramine and 5 parts of organic urea accelerator DYHARD UR300 and stir for 30 min, then add 3 parts of benzyl alcohol and stir for 10 min to obtain the antifungal and antibacterial adhesive;

[0061] Step S2: Spray an anti-mildew and antibacterial adhesive onto the surface of a 3mm thick dry rubberwood veneer, with a single-sided spraying amount of 130g / m². 2 After the spraying is completed, eight layers of anti-mildew rubberwood sheets are stacked and hot-pressed at 130℃ and 3MPa for 25 minutes, and then cold-pressed at 1.2MPa for 20 hours to obtain the anti-mildew composite board for wardrobes.

[0062] Comparative Example 3: This comparative example is a composite board for a mildew-resistant wardrobe. The difference from Example 6 is that the adhesive used does not contain mildew-resistant or antibacterial agents. The specific preparation method includes the following steps:

[0063] Step S1: Weigh the raw materials according to the weight parts, mix 50 parts of bisphenol A epoxy resin E51, 16 parts of polyurethane modified epoxy resin (EPU 133S), 9 parts of nano calcium carbonate and 2 parts of silane coupling agent KH550 evenly, add 20 parts of triethylenetetramine and 5 parts of organic urea accelerator DYHARD UR300 and stir for 30 minutes, then add 3 parts of benzyl alcohol and stir for 10 minutes to obtain the adhesive.

[0064] Step S2: Place a 3mm thick dry rubberwood sheet in a container and press a heavy object on top. Then, keep it under vacuum for 1 hour. Add an anti-mildew and antibacterial ethanol aqueous solution until the rubberwood sheet is completely submerged. Soak for 24 hours, then remove and air dry to obtain the anti-mildew rubberwood sheet. The anti-mildew and antibacterial ethanol aqueous solution is prepared by ultrasonic dispersion of the anti-mildew and antibacterial agent prepared in Example 3 in an ethanol aqueous solution. The mass fraction of the anti-mildew and antibacterial agent is 1%, and the volume ratio of ethanol to water in the ethanol aqueous solution is 8:2.

[0065] Step S3: Spray adhesive onto the surface of the mildew-resistant rubberwood veneer, with a single-sided spraying amount of 130g / m². 2 After the spraying is completed, eight layers of anti-mildew rubberwood sheets are stacked and hot-pressed at 130℃ and 3MPa for 25 minutes, and then cold-pressed at 1.2MPa for 20 hours to obtain the anti-mildew composite board for wardrobes.

[0066] The anti-mildew wardrobe composite boards prepared in Examples 4-6 and Comparative Examples 1-3 were cut into 10mm×10mm samples for performance testing:

[0067] Adhesion strength test: Adhesion strength test shall be conducted in accordance with GB / T 15036.2 standard;

[0068] Anti-mildew performance test: The sample was placed in an environment with an ambient temperature of (25±3)℃ and an air humidity of (85±5)%, and the time of surface mold growth was recorded.

[0069] The test results are shown in Table 1:

[0070] Table 1: Performance Test Results

[0071]

[0072] As can be seen from Table 1, the adhesive strength of the anti-mildew wardrobe composite board prepared by the present invention is within the range of (1.69-1.72) MPa after adhesive strength test, indicating that the composite board has good structural stability; after anti-mildew performance test, the mold growth time is within the range of (29-32) h, indicating that the composite board has excellent anti-mildew performance.

[0073] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A composite board for mildew-resistant wardrobes, characterized in that, The composite board used in the anti-mildew wardrobe is formed by bonding 5-8 layers of anti-mildew rubberwood veneer with an anti-mildew and antibacterial adhesive. The mildew-resistant rubberwood veneer is prepared by impregnating rubberwood veneer with an ethanol aqueous solution of a mildew-resistant and antibacterial agent, wherein the thickness of the rubberwood veneer is 2-3 mm; The anti-mildew and antibacterial adhesive comprises the following raw materials in parts by weight: 40-50 parts of bisphenol A epoxy resin, 10-16 parts of polyurethane modified epoxy resin, 12-20 parts of curing agent, 2-5 parts of curing accelerator, 3-6 parts of anti-mildew and antibacterial agent, 5-9 parts of nano calcium carbonate, 0.5-2 parts of silane coupling agent, and 1-3 parts of diluent. The antifungal and antibacterial agent is prepared by reacting 3-bromopropyne with an imidazole-zinc complex. The imidazole-zinc complex is prepared by reacting thiolated imidazole with zinc sulfate. The thiolated imidazole is prepared by reacting an imidazole derivative with mercaptoethylamine. The imidazole derivative is prepared by reacting 1,2,7,8-dicyclooxyoctane with imidazole. The antifungal and antibacterial agent is prepared by the following steps: Step A1: Stir 1,2,7,8-dicyclooxyoctane in DMF until homogeneous, add imidazole, and heat to 70-90℃ for 3-5 hours. Distill under reduced pressure, wash, and dry to obtain the imidazole derivative. Step A2: Mix the imidazole derivative and mercaptoethylamine in ethanol, purge with nitrogen, reflux and stir for 12 h, add n-hexane and stir for 30 min, let stand for 3 h, remove the supernatant, and rotary evaporate to obtain mercapto-imidazole. Step A3: After stirring the 20wt% zinc sulfate aqueous solution evenly, heat it to 40-50℃, slowly add 20.0wt%-20.5wt% mercaptoimidazole aqueous solution, maintain the temperature for 2-3 hours, filter, wash and dry to obtain the imidazole-zinc complex. Step A4: Mix 3-bromopropyne, sodium hydroxide and DMF evenly, add imidazole-zinc complex, heat to 35-45℃ and stir for 12-24 hours, wash, dry and purify by column chromatography to obtain antifungal and antibacterial agent.

2. The composite board for mildew-resistant wardrobes according to claim 1, characterized in that, The antifungal and antibacterial agent in ethanol aqueous solution is prepared by ultrasonically dispersing the antifungal and antibacterial agent in ethanol aqueous solution. The mass fraction of the antifungal and antibacterial agent is 0.5-1%, and the volume ratio of ethanol to water in the ethanol aqueous solution is 8:

2.

3. The composite board for mildew-resistant wardrobes according to claim 1, characterized in that, In step A1, the molar ratio of 1,2,7,8-dicyclooxyoctane to imidazole is 1.01-1.03:

1.

4. The composite board for a mildew-resistant wardrobe according to claim 1, characterized in that, In step A2, the molar ratio of the imidazole derivative to mercaptoethylamine is 1:

1.

5. The composite board for a mildew-resistant wardrobe according to claim 1, characterized in that, In step A2, the volume ratio of ethanol to n-hexane is 1:

5.

6. The composite board for a mildew-resistant wardrobe according to claim 1, characterized in that, In step A3, the molar ratio of zinc sulfate to thiolated imidazole is 1:1.7-2.

3.

7. The composite board for a mildew-resistant wardrobe according to claim 1, characterized in that, In step A4, the molar ratio of 3-bromopropyne, sodium hydroxide, and imidazole-zinc complex is 1-2:3.5-4:5-7.

8. The composite board for a mildew-resistant wardrobe according to claim 1, characterized in that, The curing agent is triethylenetetramine, the curing accelerator is the organic urea accelerator DYHARD UR300, the silane coupling agent is KH-550, and the diluent is benzyl alcohol.

9. A method for preparing a mildew-resistant composite board for a wardrobe according to any one of claims 1-8, characterized in that, Includes the following steps: Step S1: Weigh the raw materials according to the weight parts, mix and stir the bisphenol A epoxy resin, polyurethane modified epoxy resin, anti-mildew and antibacterial agent, nano calcium carbonate and silane coupling agent evenly, add curing agent and curing accelerator and stir for 30 minutes, then add diluent and stir for 10 minutes to obtain anti-mildew and antibacterial adhesive. Step S2: Place the dried rubberwood sheets in a container and press a heavy object on top. Then place it under vacuum for 1 hour. Add an anti-mildew and antibacterial ethanol aqueous solution until the rubberwood sheets are completely submerged. Soak for 24 hours, then remove and air dry to obtain anti-mildew rubberwood sheets. Step S3: Spray anti-mold and antibacterial adhesive onto the surface of the anti-mold rubberwood veneer, with a single-sided spraying amount of 130g / m². 2 After the spraying is completed, 5-8 layers of anti-mildew rubberwood sheets are stacked and hot-pressed at 120-130℃ and 3MPa for 15-25 minutes, and then cold-pressed at 1.2MPa for 12-20 hours to obtain anti-mildew composite board for wardrobes.

Images