Mildew-proof and anti-corrosion treatment process for wood for furniture

Abstract

The invention discloses a mildew and corrosion prevention treatment process for wood for furniture, and relates to the technical field of mildew and corrosion prevention of wood, comprising the following treatment processes: (1) pretreatment: drying wood at 50-60 DEG C, and controlling the moisture content at 10-15%; (2) vacuum impregnation is conducted, specifically, the wood is impregnated in an impregnation tank containing a mildew-proof preservative solution, the impregnation tank is vacuumized, the vacuum degree is kept at-0.08 MPa to-0.1 MPa, and impregnation treatment is conducted for 30-50 min; (3) pressurizing treatment: relieving vacuum, applying pressure into the tank to 1.0-1.5 Mpa, keeping for 30-50 minutes, and relieving the pressure; and (4) drying treatment is conducted, specifically, the wood is taken out, drained off and subjected to a curing reaction for 2-4 hours in the environment at the temperature of 80-100 DEG C after not dropping liquid. The mildew-proof treatment process is good in permeability to wood, a mildew-proof and anti-corrosion film layer with good water resistance and adhesive force is formed on the surface of the wood, the loss resistance is good, and the mildew-proof and anti-corrosion effects are long-acting.

Description

Technical Field

[0001] The present invention relates to the technical field of wood anti - mildew and anti - corrosion, and particularly relates to a process for anti - mildew and anti - corrosion treatment of wood for furniture. Background Art

[0002] Wood is a natural polymer material with obvious biological characteristics. If not treated, it is extremely easy to absorb moisture and be eroded by mildew, seriously affecting its appearance quality and reducing its service life. At present, the main method to solve this problem is to carry out anti - mildew and anti - corrosion treatment on wood with anti - corrosion, anti - mildew or insect - proof agents, etc. In the traditional wood anti - mildew and anti - corrosion treatment process, the anti - mildew and anti - corrosion liquid contains a large amount of organic solvents, which will volatilize during use. The mildew - proof agent usually exists in a solid or oily state, which is not conducive to the application on wood products, the treatment effect is not good, and the anti - leaching property is poor, resulting in unstable and uneven quality of anti - corrosion wood, and it is difficult to achieve a long - term effect. Summary of the Invention

[0003] In view of the above problems, the technical problem to be solved by the present invention is to provide a process for anti - mildew and anti - corrosion treatment of wood for furniture, which has good wood permeability, can form an anti - mildew and anti - corrosion film layer with good water - resistant adhesion on the wood surface, has good anti - leaching property, and has a long - term anti - mildew and anti - corrosion effect.

[0004] To solve the above - mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A process for anti - mildew and anti - corrosion treatment of wood for furniture, comprising the following treatment processes:

[0006] (1) Pretreatment: Dry the wood at a temperature of 50 - 60°C, and control the moisture content at 10% - 15%.

[0007] (2) Vacuum impregnation: Immerse the wood in an impregnation tank containing an anti - mildew and anti - corrosion liquid, conduct a vacuum treatment on the impregnation tank, maintain the vacuum degree at - 0.08 to - 0.1 MPa, and carry out the impregnation treatment for 30 - 50 min.

[0008] (3) Pressure treatment: Release the vacuum, apply pressure to the tank to 1.0 - 1.5 Mpa, maintain for 30 - 50 min, and then release the pressure.

[0009] (4) Drying treatment: After taking out the wood and draining until no liquid drips, carry out a curing reaction in an environment of 80 - 100°C for 2 - 3 hours.

[0010] By weight, the anti - mildew and anti - corrosion liquid comprises the following components:

[0011] 35 - 40 parts of quaternary ammonium salt - containing antibacterial aqueous polyurethane emulsion, 0.5 - 1 part of nano - silver dispersion, 0.2 - 0.4 part of iodopropynyl butylcarbamate, 0.1 - 0.3 part of octyl isothiazolinone, 1 - 2 parts of surfactant, 0.2 - 0.5 part of aziridine - based cross - linker, 50 - 55 parts of deionized water.

[0012] As a further improvement of the present invention, the preparation method of the quaternary ammonium salt - containing antibacterial aqueous polyurethane emulsion is as follows:

[0013] After vacuum - dehydrating the polyether diol for 0.5 - 1 h, add the first batch of isophorone diisocyanate and silane - modified isocyanate thereto at 60 °C. After reacting for 0.5 h, raise the temperature to 70 - 75 °C, add the remaining isophorone diisocyanate and silane - modified isocyanate, and continue to react for 2 h to form a polyurethane prepolymer with terminal isocyanate groups. Add 3 - 5% of the hydrophilic chain extender dimethylolpropionic acid based on the total amount of the polyurethane prepolymer, and continue to react for 1 h. After cooling to 50 °C, add quaternary ammonium salt - modified isocyanate and react for 1.5 h. Then cool to 40 °C, drop - wise add an acetic acid aqueous solution with a concentration of 30% to adjust the pH of the solution to neutral, add deionized water, add emulsifier Tween 80, and emulsify and disperse at 30 - 35 °C with a high - speed disperser at 8000 rpm for 30 minutes to obtain the quaternary ammonium salt - containing antibacterial aqueous polyurethane emulsion.

[0014] As a further improvement of the present invention, the dosage of the first batch of isocyanate is 30% of the total amount of isocyanate.

[0015] As a further improvement of the present invention, in the reaction of the polyether diol with isophorone diisocyanate and silane - modified isocyanate, the molar ratio of NCO / OH is 1.8:1 to 2.2:1.

[0016] As a further improvement of the present invention, the mass ratio of isophorone diisocyanate to silane - modified isocyanate is 0.5 - 1:4 - 4.5.

[0017] As a further improvement of the present invention, the quaternary ammonium salt - modified isocyanate is 2 - 3% of the total amount of the polyurethane prepolymer.

[0018] As a further improvement of the present invention, the preparation method of the silane - modified isocyanate is as follows: Add hydrogen - terminated silicone oil and isocyanatoethyl methacrylate into the xylene solution according to a molar ratio of 1:2.05, stir and dissolve at 60 °C, add 0.03% of the platinum catalyst based on the total amount of the solution, protect with nitrogen, raise the temperature to 80 °C, react for 4 - 6 h, and remove the solvent by vacuum distillation to obtain the silane - modified isocyanate.

[0019] As a further improvement of the present invention, the preparation method of the quaternary ammonium salt modified isocyanate is as follows: Mix isophorone diisocyanate with anhydrous acetone, heat up to 50 °C under nitrogen protection, dropwise add N-methyldiethanolamine, control the molar ratio of -NCO / -OH to be 2:1, add 0.05% of dibutyltin dilaurate based on the total amount of the solution, react at 70 °C for 3 hours, cool down to 40 °C, add bromoethane, and react for 4 hours to obtain the quaternary ammonium salt modified isocyanate.

[0020] As a further improvement of the present invention, the preparation method of the mildew and corrosion prevention liquid is as follows:

[0021] (1) Pre-disperse nano silver in water, perform ultrasonic treatment for 10 minutes, slowly add polyvinylpyrrolidone to the ethanol-water mixed solution, stir at 60 °C until completely dissolved, and slowly add the ultrasonicated nano silver dispersion, and perform magnetic stirring for 20 minutes for standby;

[0022] (2) Dissolve iodopropargyl butylcarbamate and octyl isothiazolinone in 3 parts of ethanol, add a surfactant and mix and stir evenly for standby.

[0023] (3) Place the quaternary ammonium salt antibacterial aqueous polyurethane emulsion in a reaction kettle, stir at a low speed of 300 - 500 rpm, slowly add the solution in step (1), stir and disperse for 10 - 15 min, then slowly add the solution in step (2), continue to stir and disperse for 10 - 15 min, add an aziridine crosslinking agent, and finally add the remaining deionized water and homogenize and disperse to obtain the mildew and corrosion prevention liquid.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention uses a quaternary ammonium salt antibacterial aqueous polyurethane emulsion, nano silver dispersion, iodopropargyl butylcarbamate, and octyl isothiazolinone for compound mildew and corrosion prevention. The quaternary ammonium salt has a cationic group, which can adsorb to the surface of negatively charged microbial cells, destroy the integrity of the cell membrane, and achieve the antibacterial effect; the silver ions in the nano silver dispersion can directly pierce the cell wall, causing the cell membrane to rupture and playing an antibacterial role; iodopropargyl butylcarbamate has a high-efficiency inhibitory effect on molds such as Penicillium, Trichoderma, and algae; octyl isothiazolinone can effectively interfere with bacteria and fungi in a broad spectrum. Through the combined action of various components, an effective mildew and corrosion prevention effect is achieved;

[0026] The mildew-proof and anti-corrosion liquid of the present invention uses a water-based emulsion type as a film-forming agent, does not contain volatile organic compounds, and has good environmental protection performance; after the polyurethane of the present invention forms a film, it slowly releases quaternary ammonium salts, nano-silver is embedded in the film to continuously release silver ions, and the hydrophobic segments of iodopropargyl butylcarbamate and octyl isothiazolinone are embedded in the hydrophobic microdomains of the polymer network and slowly released. Since polyurethane is crosslinked under the action of a crosslinking agent, the mildew-proof, anti-corrosion and antibacterial agents are loaded in the polymer with a crosslinked network and are not easy to migrate in the cured polymer network system, and the mildew-proof, anti-corrosion and antibacterial agents are not easy to lose, achieving a long-lasting and stable mildew-proof and anti-corrosion effect.

[0027] The present invention uses a quaternary ammonium salt-containing antibacterial water-based polyurethane emulsion as a film-forming agent. Since the surface of wood fibers has a large number of hydroxyl groups with negative charges, the cationic characteristics of the quaternary ammonium salt can reduce the surface tension of the emulsion and promote the spreading and penetration on the surface of cellulose (negatively charged). The urethane bond in polyurethane forms a hydrogen bond with the hydroxyl group of wood cellulose, improving the adhesion. At the same time, the water-based polyurethane emulsion is modified by silane, enabling silicon atoms to migrate and accumulate on the surface, improving the hydrophobicity and the overall water resistance. Detailed implementation mode

[0028] The following further illustrates the detailed implementation mode of the present invention in conjunction with embodiments.

[0029] Embodiment 1

[0030] (1) Pretreatment: Dry the wood at a temperature of 50 °C, and control the moisture content at 10% - 15%;

[0031] (2) Vacuum impregnation: Immerse the wood in an impregnation tank containing the mildew-proof and anti-corrosion liquid, perform vacuum treatment on the impregnation tank, maintain a vacuum degree of -0.08 MPa, and impregnate for 30 min;

[0032] (3) Pressure treatment: Release the vacuum, apply pressure to the tank to 1.0 Mpa, maintain for 30 min, and release the pressure;

[0033] (4) Drying treatment: After taking out the wood and draining until it stops dripping, cure and react in an environment of 80 °C for 2 hours;

[0034] By weight, the mildew-proof and anti-corrosion liquid includes the following components:

[0035] 35 parts of quaternary ammonium salt-containing antibacterial water-based polyurethane emulsion, 0.5 part of nano-silver dispersion liquid, 0.2 part of iodopropargyl butylcarbamate, 0.1 part of octyl isothiazolinone, 1 part of surfactant sodium dodecylsulfonate, 0.2 part of crosslinking agent aziridine, and 50 parts of deionized water.

[0036] The preparation method of the quaternary ammonium salt-containing antibacterial water-based polyurethane emulsion is:

[0037] (1) Add hydrogen-terminated silicone oil and isocyanatoethyl methacrylate to the xylene solution at a molar ratio of 1:2.05. The amount of xylene is 30% of the total solution volume. Stir and dissolve at 60 °C, add 0.03% of the total solution volume of platinum catalyst, protect with nitrogen, heat up to 80 °C, react for 4 - 6 h, and remove the solvent by vacuum distillation to obtain silane-modified isocyanate;

[0038] (2) Mix isophorone diisocyanate and anhydrous acetone, heat up to 50 °C under nitrogen protection, dropwise add N-methyldiethanolamine, control the -NCO / -OH molar ratio to be 2:1, add 0.05% of the total solution volume of dibutyltin dilaurate, react at 70 °C for 3 h, cool down to 40 °C, add ethyl bromide, the molar ratio of ethyl bromide to isophorone diisocyanate is 1.05:1, and react for 4 h to obtain quaternary ammonium salt-modified isocyanate;

[0039] (3) After vacuum dehydrating the polyether diol for 0.5 h, add the first batch of isophorone diisocyanate and silane-modified isocyanate to it at 60 °C. After reacting for 0.5 h, heat up to 70 °C, add the remaining isophorone diisocyanate and silane-modified isocyanate, and continue to react for 2 h to generate a polyurethane prepolymer with terminal isocyanate groups. Add 3% of the total amount of the polyurethane prepolymer of the hydrophilic chain extender dimethylolpropionic acid, and continue to react for 1 h. Cool down to 50 °C and then add the quaternary ammonium salt-modified isocyanate. After reacting for 1.5 h, cool down to 40 °C, dropwise add 30% acetic acid aqueous solution to adjust the pH of the solution to neutral, add deionized water, add 1% of the total solution volume of emulsifier Tween 80, and emulsify and disperse at 30 - 35 °C with an 8000 rpm high-speed disperser for 30 minutes to obtain a quaternary ammonium salt-containing antibacterial aqueous polyurethane emulsion;

[0040] Among them, the amount of the first batch of isocyanate is 30% of the total amount of isocyanate; in the reaction of the polyether diol with isophorone diisocyanate and silane-modified isocyanate, the NCO / OH molar ratio is 2.2:1. The mass ratio of isophorone diisocyanate to silane-modified isocyanate is 0.5:4; the quaternary ammonium salt-modified isocyanate is 2% of the total amount of the polyurethane prepolymer;

[0041] The preparation method of the mildew and corrosion prevention liquid is as follows:

[0042] (1) Pre-disperse nano-silver in water, perform ultrasonic treatment for 10 minutes to obtain a 0.5 mg / mL dispersion. Slowly add polyvinylpyrrolidone to the ethanol-water mixed solution (volume ratio 1:1), stir at 60 °C until completely dissolved to obtain a 1% mass fraction polyvinylpyrrolidone solution. The mass ratio of polyvinylpyrrolidone to nano-silver is 5:1, and slowly add the ultrasonicated nano-silver dispersion, and stir magnetically for 20 minutes for standby;

[0043] (2) Dissolve iodopropargyl butylcarbamate and octyl isothiazolinone in 3 parts of ethanol, add the surfactant sodium dodecyl sulfonate, mix and stir evenly, and set aside.

[0044] (3) Place the quaternary ammonium salt antibacterial aqueous polyurethane emulsion in a reaction kettle, stir at a low speed of 300 rpm, slowly add the solution in step (1), stir and disperse for 15 min, then slowly add the solution in step (2), continue to stir and disperse for 10 min, add aziridine crosslinking agent, and finally add the remaining deionized water, homogenize and disperse to obtain the mildew and corrosion preventive liquid.

[0045] Example 2

[0046] (1) Pretreatment: Dry the wood at a temperature of 50 °C, and control the moisture content at 10% - 15%;

[0047] (2) Vacuum impregnation: Immerse the wood in an impregnation tank containing the mildew and corrosion preventive liquid, perform a vacuum treatment on the impregnation tank, maintain a vacuum degree of -0.08 MPa, and impregnate for 50 min;

[0048] (3) Pressure treatment: Release the vacuum, apply pressure to the tank to 1.0 Mpa, maintain for 50 min, release the pressure, and take out the treated wood.

[0049] (4) Drying treatment: After taking out the wood and draining until no liquid drips, cure and react in an environment of 80 °C for 2 hours;

[0050] By weight, the mildew and corrosion preventive liquid comprises the following components:

[0051] 40 parts of quaternary ammonium salt antibacterial aqueous polyurethane emulsion, 0.5 part of nano-silver dispersion liquid, 0.2 part of iodopropargyl butylcarbamate, 0.1 part of octyl isothiazolinone, 1 part of surfactant sodium dodecyl sulfonate, 0.5 part of crosslinking agent aziridine, and 50 parts of deionized water.

[0052] The preparation method of the quaternary ammonium salt antibacterial aqueous polyurethane emulsion is the same as that in Example 1.

[0053] The preparation method of the mildew and corrosion preventive liquid is the same as that in Example 1.

[0054] Example 3

[0055] (1) Pretreatment: Dry the wood at a temperature of 60 °C, and control the moisture content at 10% - 15%;

[0056] (2) Vacuum impregnation: Immerse the wood in an impregnation tank containing the mildew and corrosion preventive liquid, perform a vacuum treatment on the impregnation tank, maintain a vacuum degree of 0.1 MPa, and impregnate for 30 min;

[0057] (3) Pressurization treatment: Release the vacuum, apply pressure to the tank up to 1.5 Mpa, maintain for 30 min, release the pressure, and take out the treated wood.

[0058] (4) Drying treatment: After taking out the wood and draining until no liquid drips, cure and react in an environment of 100 °C for 2 hours;

[0059] By weight, the mildew and corrosion preventive liquid comprises the following components:

[0060] Quaternary ammonium salt-containing antibacterial aqueous polyurethane emulsion 40 parts, nano silver dispersion 1 part, iodopropargyl butylcarbamate 0.2 part, octyl isothiazolinone 0.1 part, surfactant 1 part, crosslinking agent aziridine 0.5 part, deionized water 50 parts.

[0061] The preparation method of the quaternary ammonium salt-containing antibacterial aqueous polyurethane emulsion is the same as that in Example 1.

[0062] The preparation method of the mildew and corrosion preventive liquid is the same as that in Example 1.

[0063] Example 4

[0064] (1) Pretreatment: Dry the wood at 60 °C, and control the moisture content at 10% - 15%;

[0065] (2) Vacuum impregnation: Immerse the wood in an impregnation tank containing the mildew and corrosion preventive liquid, perform vacuum treatment on the impregnation tank, maintain the vacuum degree at 0.1 MPa, and impregnate for 50 min;

[0066] (3) Pressurization treatment: Release the vacuum, apply pressure to the tank up to 1.5 Mpa, maintain for 50 min, release the pressure, and take out the treated wood.

[0067] (4) Drying treatment: After taking out the wood and draining until no liquid drips, cure and react in an environment of 100 °C for 3 hours;

[0068] By weight, the mildew and corrosion preventive liquid comprises the following components:

[0069] Quaternary ammonium salt-containing antibacterial aqueous polyurethane emulsion 40 parts, nano silver dispersion 1 part, iodopropargyl butylcarbamate 0.4 part, octyl isothiazolinone 0.3 part, surfactant sodium dodecylsulfonate 2 parts, crosslinking agent aziridine 0.5 part, deionized water 55 parts.

[0070] The preparation method of the quaternary ammonium salt-containing antibacterial aqueous polyurethane emulsion is as follows:

[0071] (1) Add hydrogen-terminated silicone oil and isocyanatoethyl methacrylate to the xylene solution at a molar ratio of 1:2.05. The amount of xylene is 30% of the total solution volume. Stir and dissolve at 60 °C, add 0.03% of the platinum catalyst based on the total solution volume, protect with nitrogen, heat up to 80 °C, react for 4 - 6 h, and remove the solvent by vacuum distillation to obtain silane-modified isocyanate;

[0072] (2) Mix isophorone diisocyanate and anhydrous acetone, heat up to 50 °C under nitrogen protection, dropwise add N-methyldiethanolamine, control the -NCO / -OH molar ratio to be 2:1, add 0.05% of dibutyltin dilaurate based on the total solution volume, react at 70 °C for 3 h, cool down to 40 °C, add ethyl bromide, and the molar ratio of ethyl bromide to isophorone diisocyanate is 1.05:1, react for 4 h to obtain quaternary ammonium salt-modified isocyanate;

[0073] (3) After vacuum dehydrating the polyether diol for 0.5 h, add the first batch of isophorone diisocyanate and silane-modified isocyanate to it at 60 °C, react for 0.5 h, then heat up to 70 °C, add the remaining isophorone diisocyanate and silane-modified isocyanate, and continue to react for 2 h to form a polyurethane prepolymer with terminal isocyanate groups. Add 5% of the hydrophilic chain extender dimethylolpropionic acid based on the total amount of the polyurethane prepolymer, continue to react for 1 h, cool down to 50 °C, then add quaternary ammonium salt-modified isocyanate, react for 1.5 h, cool down to 40 °C, dropwise add 30% acetic acid aqueous solution to adjust the pH of the solution to neutral, add deionized water, add 1% of the emulsifier Tween 80 based on the total solution volume, and emulsify and disperse at 30 - 35 °C using an 8000 rpm high-speed disperser for 30 minutes to obtain a quaternary ammonium salt-containing antibacterial aqueous polyurethane emulsion;

[0074] Among them, the amount of the first batch of isocyanate is 30% of the total amount of isocyanate; in the reaction of the polyether diol with isophorone diisocyanate and silane-modified isocyanate, the NCO / OH molar ratio is 1.8:1. The mass ratio of isophorone diisocyanate to silane-modified isocyanate is 1:4.5; the quaternary ammonium salt-modified isocyanate is 3% of the total amount of the polyurethane prepolymer;

[0075] The preparation method of the mildew and corrosion inhibitor solution is as follows:

[0076] (1) Pre-disperse nano-silver in water, perform ultrasonic treatment for 10 minutes to obtain a 0.5 mg / mL dispersion. Slowly add polyvinylpyrrolidone to the ethanol-water mixture (volume ratio 1:1) solution, stir at 60 °C until completely dissolved to obtain a 1% polyvinylpyrrolidone solution by mass. The mass ratio of polyvinylpyrrolidone to nano-silver is 5:1, and slowly add the ultrasonicated nano-silver dispersion, and stir magnetically for 20 minutes for standby;

[0077] (2) Dissolve iodopropargyl butylcarbamate and octyl isothiazolinone in 3 parts of ethanol, add the surfactant sodium dodecyl sulfonate, mix and stir evenly for standby.

[0078] (3) Place the quaternary ammonium salt antibacterial aqueous polyurethane emulsion in a reaction kettle, stir at a low speed of 500 rpm, slowly add the solution in step (1), stir and disperse for 10 min, then slowly add the solution in step (2), continue to stir and disperse for 15 min, add aziridine crosslinking agent, and finally add the remaining deionized water, homogenize and disperse to obtain the mildew-proof and corrosion-proof liquid.

[0079] Test the penetration depth, anti-leaching property, water resistance and adhesion of the wood in Examples 1-4. The test results are shown in Table 1. Test the mildew-proof and corrosion-proof performance of the wood in Examples 1-4. Use GB / T 18261-2000 "Test Method for Preventing Wood Molds and Blue Stain Fungi with Mildew-proof Agents" to test the mildew-proof performance of the wood. The results are shown in Table 2.

[0080] Table 1

[0081]

[0082] It can be seen from Table 1 that the wood treated in Examples 1-4 has good permeability, indicating that the formula of the mildew-proof and corrosion-proof liquid of the present invention in combination with steps such as vacuum impregnation treatment and pressure treatment is conducive to the penetration of the mildew-proof and corrosion-proof liquid. Moreover, after being treated with the mildew-proof and corrosion-proof adhesive liquid of the present invention, a protective film is formed on the wood surface, significantly reducing the water absorption and moisture absorption of the wood, and the film layer has good adhesion, is not easy to fall off, and has good stability, achieving long-term protection.

[0083] Table 2 Test Results of Mildew-proof Performance

[0084]

[0085] It can be seen from Table 2 that after testing the wood treated in Examples 1-4 for decay fungi and blue stain fungi, after being soaked in white rot fungi and brown rot fungi for 12 weeks respectively, the mass loss rate ≤ 5%, and its inhibition rate against blue stain fungi is greater than 90%, indicating good mildew-proof effect.

[0086] The present invention uses quaternary ammonium salt antibacterial aqueous polyurethane emulsion, nano-silver dispersion liquid, iodopropargyl butylcarbamate, and octyl isothiazolinone as compound mildew-proof and corrosion-proof agents to achieve effective mildew-proof and corrosion-proof effects. The polyurethane is crosslinked under the action of a crosslinking agent, and the mildew-proof, corrosion-proof and antibacterial agents are loaded in the polymer with a crosslinked network. The mildew-proof, corrosion-proof and antibacterial agents are not easy to lose and can be slowly released, achieving long-term and stable mildew-proof and corrosion-proof effects.

[0087] The present invention uses a quaternary ammonium salt-containing antibacterial aqueous polyurethane emulsion as a film-forming agent. Since the surface of wood fibers has a large number of hydroxyl groups with negative charges, the cationic characteristics of the quaternary ammonium salt can reduce the surface tension of the emulsion and promote the spreading and penetration on the surface of cellulose (negatively charged). The urethane bond in the polyurethane forms a hydrogen bond with the hydroxyl group of wood cellulose, improving the adhesion. At the same time, the aqueous polyurethane emulsion is modified by silane, enabling the silicon atoms to migrate and accumulate on the surface, improving the hydrophobicity and the overall water resistance.

[0088] The above description is a detailed description of the preferred and feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications made under the technical spirit disclosed by the present invention shall fall within the scope of the patent covered by the present invention.

Claims

1. A wood mildew and corrosion prevention treatment process for furniture, characterized in that, It includes the following processing techniques: (1) Pretreatment: Dry the wood at a temperature of 50 - 60°C, and control the moisture content at 10% - 15%; (2) Vacuum impregnation: Immerse the wood in an impregnation tank containing a mildew and corrosion preventive solution, evacuate the impregnation tank, maintain the vacuum degree at -0.08 to -0.1 MPa, and carry out the impregnation treatment for 30 - 50 min; (3) Pressure treatment: Release the vacuum, apply pressure to the tank to 1.0 - 1.5 Mpa, maintain for 30 - 50 min, and then release the pressure; (4) Drying treatment: After taking out the wood and draining it until no liquid drips, cure and react in an environment of 80 - 100°C for 2 - 3 hours; By weight, the mildew and corrosion preventive solution includes the following components: 35 - 40 parts of quaternary ammonium salt - containing antibacterial aqueous polyurethane emulsion, 0.5 - 1 part of nano - silver dispersion, 0.2 - 0.4 part of iodopropargyl butylcarbamate, 0.1 - 0.3 part of octyl isothiazolinone, 1 - 2 parts of surfactant, 0.2 - 0.5 part of cross - linker aziridine, and 50 - 55 parts of deionized water.

2. The wood mildew and corrosion prevention treatment process for furniture according to claim 1, characterized in that, The preparation method of the quaternary ammonium salt - containing antibacterial aqueous polyurethane emulsion is as follows: After vacuum - dehydrating the polyether diol for 0.5 - 1 h, add the first batch of isophorone diisocyanate and silane - modified isocyanate to it at 60°C. After reacting for 0.5 h, raise the temperature to 70 - 75°C, add the remaining isophorone diisocyanate and silane - modified isocyanate, and continue to react for 2 h to form a polyurethane prepolymer with terminal isocyanate groups. Add 3 - 5% of the hydrophilic chain extender dimethylolpropionic acid based on the total amount of the polyurethane prepolymer, and continue to react for 1 h. After cooling to 50°C, add quaternary ammonium salt - modified isocyanate and react for 1.5 h. Then cool to 40°C, drop - wise add an acetic acid aqueous solution with a concentration of 30% to adjust the pH of the solution to neutral, add deionized water, add emulsifier Tween 80, and emulsify and disperse at a temperature of 30 - 35°C using an 8000 rpm high - speed disperser for 30 minutes to obtain the quaternary ammonium salt - containing antibacterial aqueous polyurethane emulsion.

3. A wood mildew and corrosion prevention treatment process for furniture according to claim 2, characterized in that, The dosage of the first batch of isocyanate is 30% of the total amount of isocyanate.

4. A wood mildew and corrosion prevention treatment process for furniture according to claim 2, characterized in that, In the reaction of the polyether diol with isophorone diisocyanate and silane - modified isocyanate, the molar ratio of NCO / OH is 1.8:1 - 2.2:

1.

5. A wood anti - mildew and anti - corrosion treatment process for furniture according to claim 2, characterized in that, The mass ratio of isophorone diisocyanate to silane - modified isocyanate is 0.5 - 1:4 - 4.

5.

6. A wood anti - mildew and anti - corrosion treatment process for furniture according to claim 2, characterized in that, The quaternary ammonium salt - modified isocyanate is 2 - 3% of the total amount of the polyurethane prepolymer.

7. A wood mildew and corrosion prevention treatment process for furniture according to claim 1, characterized in that, The preparation method of the silane - modified isocyanate is as follows: Add hydrogen - containing silicone oil with terminal groups and isocyanatoethyl methacrylate in a molar ratio of 1:2.05 to a xylene solution, stir and dissolve at 60°C, add 0.03% of a platinum catalyst based on the total amount of the solution, protect with nitrogen, raise the temperature to 80°C, react for 4 - 6 h, and remove the solvent by vacuum distillation to obtain the silane - modified isocyanate.

8. A wood anti - mildew and anti - corrosion treatment process for furniture according to claim 1, characterized in that, The preparation method of the quaternary ammonium salt modified isocyanate is as follows: Mix isophorone diisocyanate with anhydrous acetone, heat up to 50 °C under nitrogen protection, dropwise add N-methyldiethanolamine, control the -NCO / -OH molar ratio to be 2:1, add 0.05% of dibutyltin dilaurate based on the total amount of the solution, react at 70 °C for 3 hours, cool down to 40 °C, add bromoethane, and react for 4 hours to obtain the quaternary ammonium salt modified isocyanate.

9. A wood mildew and corrosion prevention treatment process for furniture according to claim 1, characterized in that, The preparation method of the mildew-proof and anti-corrosion liquid is as follows: (1) Pre-disperse nano-silver in water, perform ultrasonic treatment for 10 minutes, slowly add polyvinylpyrrolidone to the ethanol-water mixed solution, stir at 60 °C until completely dissolved, and slowly add the ultrasonicated nano-silver dispersion, and perform magnetic stirring for 20 minutes for standby; (2) Dissolve iodopropargyl butylcarbamate and octyl isothiazolinone in 3 parts of ethanol, add a surfactant and mix and stir evenly for standby. (3) Place the quaternary ammonium salt antibacterial aqueous polyurethane emulsion in a reaction kettle, stir at a low speed of 300 - 500 rpm, slowly add the solution in step (1), stir and disperse for 10 - 15 min, then slowly add the solution in step (2), continue to stir and disperse for 10 - 15 min, add aziridine crosslinker, and finally add the remaining deionized water and homogenize and disperse to obtain the mildew-proof and anti-corrosion liquid.

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