High-barrier moisture-proof wooden furniture and preparation method thereof

Abstract

The invention particularly relates to high-barrier moisture-proof wooden furniture and a preparation method thereof, and the high-barrier moisture-proof wooden furniture comprises a wooden base material, a bottom coating and a moisture-proof barrier coating, the protective barrier coating is prepared from the following raw materials in parts by weight: 60 to 70 parts of polyurethane modified acrylic emulsion, 15 to 25 parts of polyvinyl acetate, 10 to 15 parts of silicone acrylic emulsion, 5 to 10 parts of compatilizer, 40 to 50 parts of filler, 2 to 6 parts of silane coupling agent, 1 to 6 parts of dispersing agent and 1 to 10 parts of additive. The moisture-proof barrier coating is arranged on the surface of the wood base material, the moisture-proof barrier coating and the wood base material have good adhesive force, wood can be effectively protected, the water resistance, moisture resistance and damp-heat aging resistance of the wood furniture are improved, the service life of the wood furniture is prolonged, and the wood furniture is environmentally friendly. The preparation method of the high-barrier moisture-proof wooden furniture is simple in process, convenient to operate, high in production efficiency and beneficial to industrial production.

Description

Technical Field

[0001] This invention relates to the field of home furnishing technology, specifically to a high-barrier, moisture-proof wooden furniture and its preparation method. Background Technology

[0002] Furniture commonly used in daily life, such as wardrobes, TV cabinets, computer desks, dining tables, and chairs, is often made of wood. Wooden furniture is favored for its natural beauty, unique texture, and environmental friendliness. However, wood is composed of organic fibers, requiring careful maintenance and is susceptible to humidity, leading to problems such as discoloration, warping, cracking, and poor corrosion resistance during use. Current technology uses coatings to better protect wooden furniture and extend its lifespan, making the surface smoother, improving moisture resistance and corrosion resistance, inhibiting warping and cracking, and thus extending its lifespan. Coatings are classified into solvent-based, water-based, and solvent-free types. However, traditional coatings often use non-renewable resources such as petroleum derivatives as raw materials, and require the addition of large amounts of volatile solvents or diluents during preparation, which negatively impacts the environment and human health. With increasing environmental awareness, water-based coatings are rapidly developing; however, existing water-based coatings often suffer from poor water resistance, moisture resistance, resistance to damp heat aging, and adhesion, requiring further improvement. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a high-barrier, moisture-proof wooden furniture and its preparation method. This high-barrier, moisture-proof wooden furniture possesses excellent water and moisture resistance, resistance to damp heat aging, a long service life, and is environmentally friendly. The preparation method of this high-barrier, moisture-proof wooden furniture is simple, easy to operate, and has high production efficiency, making it suitable for industrial production.

[0004] The objective of this invention is achieved through the following technical solution: a high-barrier moisture-proof wooden furniture, comprising a wooden substrate, a base coating disposed on the wooden substrate, and a moisture-proof barrier coating disposed on the base coating, wherein the moisture-proof barrier coating is made of a protective barrier coating, and the protective barrier coating comprises the following raw materials in parts by weight: 60-70 parts of polyurethane modified acrylic emulsion, 15-25 parts of polyvinyl acetate, 10-15 parts of silicone acrylic emulsion, 5-10 parts of compatibilizer, 40-50 parts of filler, 2-6 parts of silane coupling agent, 1-6 parts of dispersant, and 1-10 parts of additives.

[0005] The wooden furniture of the present invention provides a base coating and a moisture-proof barrier coating on the surface of the wooden substrate. The moisture-proof barrier coating, the base coating and the wooden substrate have good adhesion, which can effectively protect the wood, improve the water and moisture resistance and damp heat aging resistance of the wooden furniture, extend its service life, and is environmentally friendly.

[0006] Furthermore, the filler is at least one selected from nano-calcium carbonate, nano-silica, nano-titanium dioxide, and nano-talc. The particle size of the filler is 20-40 nm.

[0007] Furthermore, the silane coupling agent is at least one selected from γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane.

[0008] Furthermore, the compatibilizer is at least one of maleic anhydride-grafted polyethylene and maleic anhydride-grafted polypropylene.

[0009] Furthermore, each part of the additive comprises the following raw materials in parts by weight: 0.5-4 parts of light stabilizer, 0.1-4 parts of defoamer, and 0.1-2 parts of leveling agent.

[0010] Furthermore, the light stabilizer is at least one of hindered amine light stabilizers and benzotriazole light stabilizers.

[0011] Furthermore, the defoamer is an organosilicone defoamer. The leveling agent is at least one selected from polyether-modified siloxane leveling agents, polyester-modified siloxane leveling agents, and alkyl-modified siloxane leveling agents. The dispersant is a polycarboxylate dispersant.

[0012] Furthermore, the preparation method of the polyurethane-modified acrylic emulsion includes the following steps:

[0013] (A1) Under nitrogen protection, 100 parts by weight of isophorone diisocyanate and 25-35 parts by weight of dimethyl carbonate are mixed and heated to 35-45°C; then a mixture of 8-12 parts by weight of dimethylolpropionic acid and 8-12 parts by weight of dimethyl carbonate is added dropwise; after the addition is complete, the system is heated to 60-70°C to react and obtain material A;

[0014] (A2) Cool material A to 45-55℃, add 5-10 parts of N,N-dimethylethanolamine to react, and then add 150-200 parts of deionized water to obtain material B;

[0015] (A3) Heat material B to 60-70℃, add 80-110 parts of acrylic monomer and 0.2-2 parts of initiator dropwise, and cool to room temperature after reaction to obtain polyurethane modified acrylic emulsion.

[0016] Furthermore, the acrylic monomer is at least one selected from methyl methacrylate, butyl acrylate, hydroxyethyl acrylate, glycidyl methacrylate, and acrylic acid.

[0017] Furthermore, each part of the acrylic monomer comprises the following parts by weight of raw materials: 40-50 parts of methyl methacrylate, 30-40 parts of butyl acrylate, 8-13 parts of hydroxyethyl acrylate, and 2-7 parts of acrylic acid.

[0018] Furthermore, the preparation method of the protective barrier coating includes the following steps:

[0019] (1) Add the dispersant to the mixture of polyurethane modified acrylic emulsion, polyvinyl acetate and silicone acrylic emulsion, and disperse at a speed of 200-300 r / min for 10-20 min; then add the compatibilizer and disperse at a speed of 500-600 rpm for 10-20 min to obtain mixture one.

[0020] (2) Add the silane coupling agent and filler premixed mixture to the obtained mixture 1, disperse at a speed of 500-600 rpm for 10-30 min; then add the additives, disperse at a speed of 500-600 rpm for 20-30 min, degas under vacuum, filter and discharge to obtain the protective barrier coating.

[0021] The present invention also provides a method for preparing high-barrier moisture-proof wooden furniture, comprising the following steps: sanding the surface of the wooden substrate, applying a base coating and a protective barrier coating in sequence to form a moisture-proof barrier coating, and then assembling it into furniture.

[0022] The beneficial effects of this invention are as follows: The wooden furniture of this invention, by applying a moisture-proof barrier coating to the surface of the wooden substrate, exhibits excellent adhesion between the moisture-proof barrier coating and the wooden substrate, effectively protecting the wood, improving the water and moisture resistance and resistance to damp heat aging of the wooden furniture, extending its service life, and being environmentally friendly. The preparation method of the high-barrier moisture-proof wooden furniture is simple, easy to operate, and has high production efficiency, facilitating industrial production. Detailed Implementation

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0024] In some embodiments of the present invention, a high-barrier moisture-proof wooden furniture includes a wooden substrate, a base coating disposed on the wooden substrate, and a moisture-proof barrier coating disposed on the base coating. The moisture-proof barrier coating is made of a protective barrier coating, which includes the following raw materials in parts by weight: 60-70 parts of polyurethane modified acrylic emulsion, 15-25 parts of polyvinyl acetate, 10-15 parts of silicone acrylic emulsion, 5-10 parts of compatibilizer, 40-50 parts of filler, 2-6 parts of silane coupling agent, 1-6 parts of dispersant, and 1-10 parts of additives.

[0025] In some embodiments of the present invention, the filler is at least one selected from nano-calcium carbonate, nano-silica, nano-titanium dioxide, and nano-talc. The particle size of the filler is 20-40 nm.

[0026] In some embodiments of the present invention, the filler is nano-calcium carbonate, nano-silica and nano-titanium dioxide in a weight ratio of 1-3:1-3:1.

[0027] In some embodiments of the present invention, the silane coupling agent is at least one selected from γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane.

[0028] In some embodiments of the present invention, each part of the additives includes 0.5-4 parts of light stabilizer, 0.1-4 parts of defoamer, and 0.1-2 parts of leveling agent.

[0029] In some embodiments of the present invention, the compatibilizer is at least one of maleic anhydride-grafted polyethylene and maleic anhydride-grafted polypropylene.

[0030] In some embodiments of the present invention, the light stabilizer is at least one of hindered amine light stabilizers and benzotriazole light stabilizers.

[0031] In some embodiments of the present invention, the defoamer is an organosilicone defoamer. The defoamer used is defoamer BYK028.

[0032] In some embodiments of the present invention, the leveling agent is at least one selected from polyether-modified siloxane leveling agents, polyester-modified siloxane leveling agents, and alkyl-modified siloxane leveling agents.

[0033] In some embodiments of the present invention, the dispersant is a polycarboxylate dispersant. The dispersant used is dispersant 5040.

[0034] In some embodiments of the present invention, the preparation method of the polyurethane-modified acrylic emulsion includes the following steps:

[0035] (A1) Under nitrogen protection, 100 parts by weight of isophorone diisocyanate and 25-35 parts by weight of dimethyl carbonate are mixed and added to a reaction vessel, and the temperature is raised to 35-45℃; then a mixture of 8-12 parts by weight of dimethylolpropionic acid and 8-12 parts by weight of dimethyl carbonate is added dropwise over a period of 30-60 minutes; after the addition is complete, the system is heated to 60-70℃ and reacted for 60-150 minutes until the NCO content drops to 7-8%, yielding material A;

[0036] (A2) Cool material A to 45-55℃, add 5-10 parts of N,N-dimethylethanolamine, react for 30-60 minutes, add 150-200 parts of deionized water and stir to obtain material B;

[0037] (A3) Heat material B to 60-70℃, add 80-110 parts of acrylic monomer and 0.2-2 parts of initiator dropwise, react for 4-6 hours, and cool to room temperature to obtain polyurethane modified acrylic emulsion.

[0038] Furthermore, the acrylic monomer is at least one selected from methyl methacrylate, butyl acrylate, hydroxyethyl acrylate, glycidyl methacrylate, and acrylic acid.

[0039] Furthermore, each part of the acrylic monomer comprises the following parts by weight of raw materials: 40-50 parts of methyl methacrylate, 30-40 parts of butyl acrylate, 8-13 parts of hydroxyethyl acrylate, and 2-7 parts of acrylic acid.

[0040] Furthermore, the preparation method of the protective barrier coating includes the following steps:

[0041] (1) Add the dispersant to the mixture of polyurethane modified acrylic emulsion, polyvinyl acetate and silicone acrylic emulsion, and disperse at a speed of 200-300 r / min for 10-20 min; then add the compatibilizer and disperse at a speed of 500-600 rpm for 10-20 min to obtain mixture one.

[0042] (2) Add the silane coupling agent and filler premixed mixture to the obtained mixture 1, disperse at a speed of 500-600 rpm for 10-30 min; then add the additives, disperse at a speed of 500-600 rpm for 20-30 min, degas under vacuum, filter and discharge to obtain the protective barrier coating.

[0043] In some embodiments of the present invention, a method for preparing high-barrier, moisture-proof wooden furniture includes the following steps: sanding the surface of a wooden substrate, sequentially applying a base coating and a protective barrier coating to form a moisture-proof barrier coating, and then assembling it into furniture. The base coating is a diluted silane coupling agent solution. The wooden furniture can be wardrobes, TV cabinets, computer desks, dining tables, chairs, stools, and other home and office furnishings.

[0044] In some embodiments of the present invention, the concentration of the silane coupling agent solution used in the base coating is 2-4%. The silane coupling agent is at least one selected from γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane.

[0045] Example 1

[0046] In this embodiment, a high-barrier moisture-proof wooden furniture includes a wooden substrate, a base coating disposed on the wooden substrate, and a moisture-proof barrier coating of the base coating. The moisture-proof barrier coating is made of a protective barrier paint, which comprises the following raw materials in parts by weight: 65 parts of polyurethane modified acrylic emulsion, 20 parts of polyvinyl acetate, 12 parts of silicone acrylic emulsion, 8 parts of compatibilizer, 45 parts of filler, 4 parts of silane coupling agent, 4 parts of dispersant, and 3.5 parts of additives. The polyvinyl acetate used is Jiyesheng A00282. The silicone acrylic emulsion used is Anhui Zhongen Chemical WC-SA108 silicone acrylic emulsion.

[0047] Furthermore, the filler is composed of nano-calcium carbonate, nano-silica, and nano-titanium dioxide in a weight ratio of 2:2:1. The particle size of the filler is 20-40 nm.

[0048] Furthermore, the silane coupling agent is composed of γ-aminopropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane in a weight ratio of 2:1.

[0049] Furthermore, the compatibilizer is maleic anhydride-grafted polyethylene. The maleic anhydride-grafted polyethylene used is Nanjing Sutai G-6 maleic anhydride-grafted polyethylene.

[0050] Furthermore, the additives include 2 parts of light stabilizer, 1 part of defoamer, and 0.5 parts of leveling agent.

[0051] Furthermore, the light stabilizer is light stabilizer 770. The defoamer is defoamer BYK 028. The leveling agent is leveling agent BYK 333. The dispersant is dispersant 5040.

[0052] Furthermore, the preparation method of the polyurethane-modified acrylic emulsion includes the following steps:

[0053] (A1) Under nitrogen protection, 100 parts by weight of isophorone diisocyanate and 30 parts by weight of dimethyl carbonate were mixed and added to a reaction vessel, and the temperature was raised to 40°C; then a mixture of 10 parts by weight of dimethylolpropionic acid and 10 parts by weight of dimethyl carbonate was added dropwise over a period of 30 minutes; after the addition was complete, the system was heated to 65°C and reacted until the NCO content dropped to 7.5%, yielding material A;

[0054] (A2) Cool material A to 50°C, add 7.5 parts of N,N-dimethylethanolamine, react for 40 min, and add 180 parts of deionized water to obtain material B;

[0055] (A3) Heat material B to 65°C, add 95 parts of acrylic monomer and 0.9 parts of initiator ammonium persulfate dropwise over a period of 60 min, then heat to 75°C and react for 5 h; after cooling to room temperature, polyurethane modified acrylic emulsion is obtained.

[0056] Furthermore, each part of the acrylic monomer comprises the following parts by weight of raw materials: 45 parts of methyl methacrylate, 35 parts of butyl acrylate, 12 parts of hydroxyethyl acrylate, and 3 parts of acrylic acid.

[0057] Furthermore, the preparation method of the protective barrier coating includes the following steps:

[0058] (1) Add the dispersant to the mixture of polyurethane modified acrylic emulsion, polyvinyl acetate and silicone acrylic emulsion, and disperse at 300 r / min for 15 min; then add the compatibilizer and disperse at 500 rpm for 15 min to obtain mixture one.

[0059] (2) Add the silane coupling agent and filler premixed mixture to the obtained mixture 1, disperse at 600 rpm for 20 min; then add the additives, disperse at 600 rpm for 25 min, perform vacuum degassing, filter and discharge to obtain the protective barrier coating.

[0060] In this embodiment, a method for preparing high-barrier, moisture-proof wooden furniture includes the following steps: sanding the surface of a wooden substrate, sequentially coating it with a base coat and a protective barrier coating to form a moisture-proof barrier coating, and then assembling it into furniture. The base coat is a diluted γ-aminopropyltriethoxysilane solution.

[0061] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0062] Example 2

[0063] In this embodiment, a high-barrier moisture-proof wooden furniture includes a wooden substrate, a base coating disposed on the wooden substrate, and a moisture-proof barrier coating of the base coating. The moisture-proof barrier coating is made of a protective barrier coating, which includes the following raw materials in parts by weight: 60 parts of polyurethane modified acrylic emulsion, 23 parts of polyvinyl acetate, 14 parts of silicone acrylic emulsion, 8 parts of compatibilizer, 45 parts of filler, 4 parts of silane coupling agent, 4 parts of dispersant, and 3.5 parts of additives.

[0064] Furthermore, the filler is composed of nano-calcium carbonate, nano-silica, and nano-titanium dioxide in a weight ratio of 2.5:1.5:1. The particle size of the filler is 20-40 nm.

[0065] Furthermore, the silane coupling agent is composed of γ-aminopropyltriethoxysilane and γ-mercaptopropyltrimethoxysilane in a weight ratio of 2:1.

[0066] Furthermore, the preparation method of the polyurethane-modified acrylic emulsion includes the following steps:

[0067] (A1) Under nitrogen protection, 100 parts by weight of isophorone diisocyanate and 30 parts by weight of dimethyl carbonate were mixed and added to a reaction vessel, and the temperature was raised to 40°C; then a mixture of 10 parts by weight of dimethylolpropionic acid and 10 parts by weight of dimethyl carbonate was added dropwise over a period of 30 minutes; after the addition was complete, the system was heated to 65°C and reacted until the NCO content dropped to 7.5%, yielding material A;

[0068] (A2) Cool material A to 50°C, add 7.5 parts of N,N-dimethylethanolamine, react for 40 min, and add 180 parts of deionized water to obtain material B;

[0069] (A3) Heat material B to 65°C, add 95 parts of acrylic monomer and 0.9 parts of initiator ammonium persulfate dropwise over a period of 60 min, then heat to 75°C and react for 5 h. After cooling to room temperature, polyurethane modified acrylic emulsion is obtained.

[0070] Furthermore, each part of the acrylic monomer comprises the following parts by weight of raw materials: 45 parts of methyl methacrylate, 35 parts of butyl acrylate, 12 parts of hydroxyethyl acrylate, and 3 parts of acrylic acid.

[0071] Furthermore, the preparation method of the protective barrier coating includes the following steps:

[0072] (1) Add the dispersant to the mixture of polyurethane modified acrylic emulsion, polyvinyl acetate and silicone acrylic emulsion, and disperse at 300 r / min for 15 min; then add the compatibilizer and disperse at 500 rpm for 15 min to obtain mixture one.

[0073] (2) Add the silane coupling agent and filler premixed mixture to the obtained mixture 1, disperse at 600 rpm for 20 min; then add the additives, disperse at 600 rpm for 25 min, perform vacuum degassing, filter and discharge to obtain the protective barrier coating.

[0074] In this embodiment, a method for preparing high-barrier, moisture-proof wooden furniture includes the following steps: sanding the surface of a wooden substrate, sequentially coating it with a base coat and a protective barrier coating to form a moisture-proof barrier coating, and then assembling it into furniture. The base coat is a diluted γ-aminopropyltriethoxysilane solution.

[0075] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0076] Example 3

[0077] In this embodiment, a high-barrier moisture-proof wooden furniture includes a wooden substrate, a base coating disposed on the wooden substrate, and a moisture-proof barrier coating of the base coating. The moisture-proof barrier coating is made of a protective barrier coating, which includes the following raw materials in parts by weight: 70 parts of polyurethane modified acrylic emulsion, 17 parts of polyvinyl acetate, 10 parts of silicone acrylic emulsion, 8 parts of compatibilizer, 45 parts of filler, 4 parts of silane coupling agent, 4 parts of dispersant, and 3.5 parts of additives.

[0078] Furthermore, the filler is composed of nano-calcium carbonate, nano-silica, and nano-titanium dioxide in a weight ratio of 1.5:2.5:1. The particle size of the filler is 20-40 nm.

[0079] Furthermore, the silane coupling agent is composed of γ-aminopropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane in a weight ratio of 2:1.

[0080] Furthermore, the preparation method of the polyurethane-modified acrylic emulsion includes the following steps:

[0081] (A1) Under nitrogen protection, 100 parts by weight of isophorone diisocyanate and 30 parts by weight of dimethyl carbonate were mixed and added to a reaction vessel, and the temperature was raised to 40°C; then a mixture of 10 parts by weight of dimethylolpropionic acid and 10 parts by weight of dimethyl carbonate was added dropwise over a period of 30 minutes; after the addition was complete, the system was heated to 65°C and reacted until the NCO content dropped to 7.5%, yielding material A;

[0082] (A2) Cool material A to 50°C, add 7.5 parts of N,N-dimethylethanolamine, react for 40 min, and add 180 parts of deionized water to obtain material B;

[0083] (A3) Heat material B to 65°C, add 95 parts of acrylic monomer and 0.9 parts of initiator ammonium persulfate dropwise over a period of 60 min, then heat to 75°C and react for 5 h. After cooling to room temperature, polyurethane modified acrylic emulsion is obtained.

[0084] Furthermore, each part of the acrylic monomer comprises the following parts by weight of raw materials: 45 parts of methyl methacrylate, 35 parts of butyl acrylate, 12 parts of hydroxyethyl acrylate, and 3 parts of acrylic acid.

[0085] Furthermore, the preparation method of the protective barrier coating includes the following steps:

[0086] (1) Add the dispersant to the mixture of polyurethane modified acrylic emulsion, polyvinyl acetate and silicone acrylic emulsion, and disperse at 300 r / min for 15 min; then add the compatibilizer and disperse at 500 rpm for 15 min to obtain mixture one.

[0087] (2) Add the silane coupling agent and filler premixed mixture to the obtained mixture 1, disperse at 600 rpm for 20 min; then add the additives, disperse at 600 rpm for 25 min, perform vacuum degassing, filter and discharge to obtain the protective barrier coating.

[0088] In this embodiment, a method for preparing high-barrier, moisture-proof wooden furniture includes the following steps: sanding the surface of a wooden substrate, sequentially coating it with a base coat and a protective barrier coating to form a moisture-proof barrier coating, and then assembling it into furniture. The base coat is a diluted γ-aminopropyltriethoxysilane solution.

[0089] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0090] Comparative Example 1

[0091] The difference between this comparative example and Example 1 is that the protective barrier coating provided in this comparative example uses Covestro Impranil DAA of equal solids content to replace the polyurethane-modified acrylic emulsion. The rest of the contents of this comparative example are the same as in Example 1, and will not be repeated here.

[0092] Comparative Example 2

[0093] The difference between this comparative example and Example 1 is that the protective barrier coating provided in this comparative example does not contain polyvinyl acetate, but is replaced by an equal amount of polyurethane-modified acrylic emulsion. The rest of the contents of this comparative example are the same as those in Example 1, and will not be repeated here.

[0094] Multiple pine boards from the same batch with a moisture content of approximately 5% were selected as the wood substrate to be coated. The moisture content was determined according to GB / T1931-2009. The surface of the boards was sanded until the surface roughness Ra ≤ 5 μm. A 3% γ-aminopropyltriethoxysilane solution was then sprayed to ensure no missed areas. The spraying rate was 10 g / m². 2 The substrates were placed at room temperature (25°C) for 24 hours. Then, the protective barrier coatings prepared in Examples 1-3 and Comparative Examples 1-2 were uniformly coated onto different wood panel surfaces and cured for 7 days at 23°C / 50% RH, with a dry film thickness controlled at 60 μm, to obtain wood panel samples. The performance of the wood substrates with moisture-proof barrier coatings prepared in Examples 1-3 and Comparative Examples 1-2 was measured.

[0095]

[0096]

[0097] The water resistance test involves immersing the sample in water at 23℃ for 96 hours and observing whether the coating blisters, peels off, or cracks. The water absorption test involves immersing the sample in water at 23℃ for 24 hours and measuring the weight change before and after immersion. The damp heat aging test involves treating the sample at 85% RH / 85℃ for 168 hours and observing whether the coating blisters, peels off, or cracks. The adhesion test follows GB / T 4893.4-2023, with a cross-cut spacing of 1 mm. The abrasion resistance test follows GB / T 4893.8-2023, where the sample is made into a 100 mm diameter disc and subjected to Taber abrasion using a CS-10 wheel at 1 kg / 1000 rpm. The formaldehyde emission test follows the climate chamber method in GB / T 31106-2014, with test conditions of 23℃ and 50% RH.

[0098] In summary, the wooden furniture of the present invention involves sequentially coating a base layer and a moisture-proof barrier coating onto the surface of a wooden substrate. The barrier coating uses polyurethane-modified acrylic emulsion, polyvinyl acetate, and silicone-acrylic emulsion as base resins, and is combined with compatibilizers, fillers, silane coupling agents, and other raw materials. These raw materials work synergistically to achieve good adhesion to the wooden substrate and / or the base layer, providing excellent barrier properties and effectively protecting the wood. This helps improve the water and moisture resistance and resistance to damp heat aging of the wooden furniture, extending its service life, and is environmentally friendly. The preparation method is simple, easy to operate and control, and has high production efficiency. The resulting product has stable quality and is suitable for industrial production.

[0099] The specific embodiments described above are further illustrations of the technical solution and beneficial effects of the present invention, and are not intended to limit the implementation methods. For those skilled in the art, any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A type of high-barrier, moisture-proof wooden furniture, characterized in that: The high-barrier moisture-proof wooden furniture includes a wood substrate, a base coating disposed on the wood substrate, and a moisture-proof barrier coating disposed on the base coating. The moisture-proof barrier coating is made of a protective barrier paint, which includes the following raw materials in parts by weight: 60-70 parts of polyurethane modified acrylic emulsion, 15-25 parts of polyvinyl acetate, 10-15 parts of silicone acrylic emulsion, 5-10 parts of compatibilizer, 40-50 parts of filler, 2-6 parts of silane coupling agent, 1-6 parts of dispersant, and 1-10 parts of additives.

2. The high-barrier, moisture-proof wooden furniture according to claim 1, characterized in that: The filler is at least one of nano-calcium carbonate, nano-silica, nano-titanium dioxide, and nano-talc.

3. The high-barrier, moisture-proof wooden furniture according to claim 1, characterized in that: The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane.

4. The high-barrier, moisture-proof wooden furniture according to claim 1, characterized in that: The compatibilizer is at least one of maleic anhydride-grafted polyethylene and maleic anhydride-grafted polypropylene.

5. The high-barrier, moisture-proof wooden furniture according to claim 1, characterized in that: Each portion of the additives comprises 0.5-4 parts of light stabilizer, 0.1-4 parts of defoamer, and 0.1-2 parts of leveling agent.

6. The high-barrier, moisture-proof wooden furniture according to claim 4, characterized in that: The light stabilizer is at least one of hindered amine light stabilizers and benzotriazole light stabilizers.

7. The high-barrier, moisture-proof wooden furniture according to claim 4, characterized in that: The leveling agent is at least one of polyether-modified siloxane leveling agent, polyester-modified siloxane leveling agent, and alkyl-modified siloxane leveling agent.

8. The high-barrier, moisture-proof wooden furniture according to claim 1, characterized in that: The preparation method of the polyurethane-modified acrylic emulsion includes the following steps: (A1) Under nitrogen protection, 100 parts by weight of isophorone diisocyanate and 25-35 parts by weight of dimethyl carbonate are mixed and heated to 35-45°C; then a mixture of 8-12 parts by weight of dimethylolpropionic acid and 8-12 parts by weight of dimethyl carbonate is added dropwise; after the addition is complete, the system is heated to 60-70°C to react and obtain material A; (A2) Cool material A to 45-55℃, add 5-10 parts of N,N-dimethylethanolamine to react, and then add 150-200 parts of deionized water to obtain material B; (A3) Heat material B to 60-70℃, add 80-110 parts of acrylic monomer and 0.2-2 parts of initiator dropwise, and cool to room temperature after reaction to obtain polyurethane modified acrylic emulsion.

9. The method for preparing the protective barrier coating according to claim 1, characterized in that: Includes the following steps: (1) Add polyurethane modified acrylic emulsion, polyvinyl acetate, and silicone acrylic emulsion to a dispersant for dispersion. Then a compatibilizer is added for dispersion to obtain mixture one; (2) Disperse the mixture obtained by adding a pre-mixed mixture of silane coupling agent and filler to the mixture; Then, add the additives, disperse them evenly, degas, filter and discharge to obtain the protective barrier coating.

10. A method for preparing high-barrier moisture-proof wooden furniture as described in any one of claims 1-9, characterized in that: The process includes the following steps: sanding the surface of the wood substrate, applying a base coat and a protective barrier coating in sequence to form a moisture-proof barrier coating, and then assembling it into furniture.

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