A wood furniture coating and its preparation method

Abstract

The present invention discloses a wood furniture coating, which comprises the following components in parts by weight: 40-42 parts of waterborne alkyd resin, 15-18 parts of modified cellulose emulsion, 5-8 parts of polyethylene glycol, 3-4 parts of nano clay, 1-2 parts of aerogel, 1-1.5 parts of sodium carboxymethyl cellulose, 9-12 parts of pigment, and 40-45 parts of deionized water. The preparation method of the wood furniture coating is as follows: the waterborne alkyd resin, polyethylene glycol, nano clay, aerogel, sodium carboxymethyl cellulose and deionized water are dispersed and mixed in proportion, then placed in a wet grinder, and the modified cellulose emulsion and pigment are added for grinding to obtain the wood furniture coating. The wood furniture coating prepared by the present invention has strong adhesion and wear resistance, is not easy to peel off, and the raw materials used are all environmentally friendly raw materials, with low volatile organic compounds (VOC), and has little impact on the body and the environment.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly relates to a wood furniture coating and a preparation method thereof. Background Art

[0002] Wood furniture is furniture made mainly of various woods. In order to improve the aesthetics and durability of wood furniture, a protective coating is usually applied to the surface of the furniture, which can not only increase the color diversity and aesthetic value of the furniture, but also improve the anti-corrosion property of the furniture and extend its service life.

[0003] With the improvement of people's living standards, the requirements for the health, safety, comfort and environmental protection of furniture are getting higher and higher, so furniture manufacturers have stricter requirements for the selection of furniture coatings. In addition to being beautiful, stable and durable, health and environmental protection are also factors to be considered for furniture coatings. However, the existing wood furniture coatings on the market have strong odors, high VOC content, which have a greater impact on health and the environment, and poor coating adhesion, are easy to peel off, and have poor wear resistance.

[0004] Therefore, the present invention provides a wood furniture coating and a preparation method thereof to solve the problems of poor environmental protection, poor adhesion, easy peeling off and poor wear resistance of wood furniture coatings. Summary of the Invention

[0005] The purpose of the present invention is to provide a wood furniture coating and a preparation method thereof to solve the problems of strong odor, high VOC content, large environmental impact, poor coating adhesion, easy peeling off and poor wear resistance of wood furniture coatings as mentioned in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A wood furniture coating, comprising the following components in parts by weight: 40 - 42 parts of waterborne alkyd resin, 15 - 18 parts of modified cellulose emulsion, 5 - 8 parts of polyethylene glycol, 3 - 4 parts of nano-clay, 1 - 2 parts of aerogel, 1 - 1.5 parts of sodium carboxymethyl cellulose, 9 - 12 parts of pigment, and 40 - 45 parts of deionized water.

[0007] Further, the nano-clay is prepared by mixing and reacting the following components in parts by weight: 35 - 40 parts of fireclay, 15 - 20 parts of mullite, 4 - 6 parts of sodium hydroxide, 2 - 3 parts of 2,5-furandimethanol, 1 - 3 parts of N-hydroxysuccinimide, and 55 - 60 parts of deionized water.

[0008] Further, the modified cellulose emulsion is prepared by mixing and modifying the following components in parts by weight: 38 - 40 parts of cellulose, 10 - 12 parts of nano-zinc oxide, 1.5 - 2 parts of polyvinyl alcohol, 0.5 - 1 part of 2,5-furandimethanol, and 45 - 50 parts of deionized water.

[0009] Further, the aerogel is prepared by mixing, freeze-drying, and grinding the following components in parts by weight: 30-32 parts of aqueous acrylic resin, 20-25 parts of polyacrylamide, 6-8 parts of nano-silica, 3-5 parts of sodium carboxymethyl cellulose, and 45-50 parts of deionized water.

[0010] Further, the preparation method of the wood furniture coating includes the following steps:

[0011] S1. Preparation of nano-clay: Clean and air-dry the surface of pyrophyllite and mullite, and then ball-mill them to 400-500 mesh respectively; mix the ball-milled pyrophyllite and mullite in proportion, add deionized water, sodium hydroxide, 2,5-furandimethanol, and N-hydroxysuccinimide, and then place them in a reaction kettle. React at 170-180 °C and 15-18 Mpa for 80-90 min; cool the mixture in the reaction kettle to room temperature and then perform centrifugation. Then, wash the pyrophyllite and mullite mixture with deionized water and ethanol three times in sequence, and perform centrifugation. After that, place it in a drying oven at 70-75 °C and dry for 7-8 h. After cooling to room temperature, grind and sieve to obtain nano-clay with a particle size of 60-80 nm.

[0012] S2. Preparation of modified cellulose emulsion: Mix cellulose and nano-zinc oxide in proportion and place them in a plasma device for treatment for 3-4 min. Then, add deionized water and mix them, and then place them in an ultrasonic device. Add polyvinyl alcohol and 2,5-furandimethanol and perform ultrasonic treatment for 15-20 min to obtain a modified cellulose emulsion.

[0013] S3. Preparation of aerogel: Place the aqueous acrylic resin, polyacrylamide, nano-silica, sodium carboxymethyl cellulose, and deionized water under the condition of 35-40 °C and stir and mix for 15-20 min to obtain a mixed solution; perform freeze-drying and grinding on the mixed solution to obtain an aerogel with a particle size of 40-60 nm.

[0014] S4. Place the aqueous alkyd resin, polyethylene glycol, nano-clay, aerogel, sodium carboxymethyl cellulose, and deionized water in proportion in a dispersion kettle and disperse to obtain a dispersed mixture.

[0015] S5. Place the dispersed mixture in S4 in a wet grinding machine, add the modified cellulose emulsion and pigments, and grind to obtain the wood furniture coating.

[0016] As a preferred technical solution of the present invention, the pigment is any one of copper powder, aluminum powder, iron powder, and titanium dioxide.

[0017] As a preferred technical solution of the present invention, the rotation speed of the ball mill is 90-100 rpm, and the volume concentration of ethanol is 80-85%.

[0018] As a preferred technical solution of the present invention, the charge density of the plasma device is 1200 - 1250 C / cm 3 , the gas flow rate is 1.5 - 1.6 L / min, the pressure is 100 - 105 kPa, and the temperature is 60 - 65 °C.

[0019] As a preferred technical solution of the present invention, the ultrasonic frequency of the ultrasonic device is 65 - 70 Hz, and the temperature is 45 - 50 °C.

[0020] As a preferred technical solution of the present invention, the particle size of the nano-silica is 60 - 80 nm.

[0021] As a preferred technical solution of the present invention, the rotation speed of the dispersion kettle is 2000 - 2200 rpm, and the dispersion time is 50 - 60 min.

[0022] As a preferred technical solution of the present invention, the rotation speed of the wet grinder is 2500 - 2600 rpm, and the grinding time is 40 - 45 min.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Fireclay has good anti-cracking performance and adhesion. Mullite has high hardness and wear resistance, which can improve the fluidity of the coating, make the coating easier to process and form, and improve the surface finish and flatness of the coating. Adding it to the coating can significantly improve the hardness and wear resistance of the coating. During the production process of nano-clay, 2,5-furandimethanol and N-hydroxysuccinimide are added in an alkaline environment of sodium hydroxide, which can promote the phase transformation or reconstruction and grain refinement of fireclay and mullite, thus making nano-clay. The nano-clay prepared by the present invention has excellent adhesion performance, can significantly increase the viscosity of the coating, make the coating easier to construct. At the same time, nano-clay can reduce the frictional resistance between pigments and fillers in the coating, making the pigments and fillers more evenly dispersed in the coating, improving the uniformity and stability of the coating. Moreover, nano-clay has a layered structure and a high specific surface area, which can significantly improve the rheological properties, mechanical properties, adhesion, water resistance and wear resistance of the coating.

[0025] 2. Plasma treatment causes microstructural changes such as grain refinement in cellulose and nano-zinc oxide, which helps improve the mechanical properties of cellulose. At the same time, a series of chemical reactions occur on the surface of cellulose and nano-zinc oxide under the action of plasma, which helps introduce new functional groups on the cellulose surface, change the surface properties of cellulose, and improve the hydrophilicity, wettability, and dispersibility of cellulose. Polyvinyl alcohol can improve the water resistance and chemical resistance of the coating, and enhance the adhesion and film-forming properties of the coating. 2,5-Furandimethanol has multiple functional groups such as hydroxyl groups and has a relatively strong ability to form hydrogen bonds, which can promote cellulose modification, enhance the adhesion and film-forming properties of the coating, and improve the flexibility and wear resistance of the coating. At the same time, 2,5-furandimethanol has high volatility, which helps the rapid drying of the coating. The addition of nano-zinc oxide can enhance the mechanical properties of cellulose materials such as strength and hardness, and at the same time endow the coating with excellent ultraviolet protection and antibacterial functions. After the cellulose is modified and added to the wood furniture coating, it can significantly enhance the adhesion, water resistance, flexibility, and wear resistance of the coating film, reduce the probability of crack appearance and cracking phenomenon of the coating film, improve the mechanical properties such as strength and hardness of the coating, and at the same time endow the coating with excellent ultraviolet protection and antibacterial functions.

[0026] 3. The present invention adds aerogel to the production process of wood furniture coatings. Aerogel has characteristics such as low thermal conductivity, low density, and high porosity, which makes the coating have heat insulation performance. In case of a fire, the aerogel can effectively isolate the flame and high temperature and reduce the heat transfer. The porous structure of aerogel makes it have excellent sound absorption ability, so that the furniture coating added with aerogel can reduce noise pollution. At the same time, the porous structure of aerogel can slow down the heat diffusion rate and delay the furniture from being affected by high temperature. And the large specific surface area of aerogel can adsorb a large number of gas molecules and smoke particles, reduce the concentration of harmful gases at the fire scene, and reduce the harm of the fire to personnel and the environment.

[0027] 4. The raw materials used in the present invention are all environmentally friendly raw materials, which have low volatile organic compounds (VOCs) and have little impact on the body and the environment. Brief Description of the Drawings

[0028] Figure 1 It is the preparation flow chart of the wood furniture coating of the present invention;

[0029] Figure 2 It is the broken line graph of the water resistance of the coating of the present invention. Detailed Embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] As Figure 1 shown, a preparation method of a wood furniture coating includes the following steps: S1. Preparation of nano-clay: Clean and air-dry the fireclay and mullite, and then ball-mill them to 400-500 mesh respectively; Mix the ball-milled fireclay and mullite in proportion, add deionized water, sodium hydroxide, 2,5-furandimethanol, and N-hydroxysuccinimide, and then place them in a reaction kettle. React at 170-180 °C and 15-18 Mpa for 80-90 min; Cool the mixture in the reaction kettle to room temperature and then perform centrifugation. Then, wash the fireclay and mullite mixture with deionized water and ethanol three times in sequence, and perform centrifugation. After that, place it in a drying oven at 70-75 °C and dry for 7-8 h. Cool to room temperature and then grind and sieve to obtain nano-clay. S2. Preparation of modified cellulose emulsion: Mix cellulose and nano-zinc oxide in proportion and place them in a plasma device for treatment for 3-4 min. Then, add deionized water and place it in an ultrasonic device, and add polyvinyl alcohol and 2,5-furandimethanol for ultrasonic treatment to obtain a modified cellulose emulsion. S3. Preparation of aerogel: Place aqueous acrylic resin, polyacrylamide, nano-silica, sodium carboxymethylcellulose, and deionized water under the condition of 35-40 °C and stir and mix to obtain a mixed solution; Freeze-dry and grind the mixed solution to obtain aerogel. S4. Place aqueous alkyd resin, polyethylene glycol, nano-clay, aerogel, sodium carboxymethylcellulose, and deionized water in proportion in a dispersion kettle to disperse and obtain a dispersed mixture. S5. Place the dispersed mixture in S4 in a wet grinder, add the modified cellulose emulsion and pigments, and grind to obtain a wood furniture coating.

[0032] Nano-clay has excellent adhesion performance, can significantly improve the viscosity of the coating, make the coating easier to apply and construct, and reduce dripping; At the same time, the lubricating effect of nano-clay can reduce the frictional resistance between pigments and fillers in the coating, making the pigments and fillers more evenly dispersed in the coating, thereby improving the uniformity and stability of the coating; Moreover, nano-clay has a layered structure and a high specific surface area, which can significantly improve the rheology, mechanical properties, adhesion and water resistance of the coating.

[0033] In the present invention, chamotte and mullite are ball-milled to a certain particle size, then sodium hydroxide, 2,5-furandimethanol, and N-hydroxysuccinimide are added, and the reaction is carried out under high temperature and high pressure. After that, nano-clay is obtained through centrifugation, washing, and grinding. Chamotte is a mixture of various aluminosilicates, with the main chemical components being alumina and silica, and also containing alkalis, alkaline earths, oxides such as iron and titanium, as well as some organic substances. Chamotte has good anti-cracking performance and adhesion. Mullite is mainly composed of aluminosilicates, with the chemical formula of 3Al2O3·2SiO2 or 2Al2O3·SiO2, mainly containing alumina and silica. At the same time, mullite also contains TiO2, Fe2O3, etc. Mullite can improve the fluidity of the coating, enhance the surface smoothness and flatness of the coating, making the surface of the furniture more beautiful and smooth. At the same time, mullite has high hardness and wear resistance. Adding it to the coating can significantly improve the hardness and wear resistance of the coating, making the surface of the furniture more durable and not easily scratched or worn. In the process of preparing nano-clay in the present invention, 2,5-furandimethanol and N-hydroxysuccinimide are added in an alkaline environment of sodium hydroxide, which can promote the phase transformation or reconstruction and grain refinement of chamotte and mullite, thereby preparing nano-clay and improving the rheological properties, mechanical properties, adhesion, water resistance, and wear resistance of the coating.

[0034] Cellulose is a natural polymer compound with good biocompatibility and biodegradability. Cellulose can form a network structure in the coating, increasing the viscosity of the coating, improving the rheological properties of the coating, and making it easier to construct. At the same time, cellulose can also bridge the cracks and micro-defects on the surface of the coating film, avoiding the appearance of cracks and cracking in the coating film. In addition, cellulose contains a large number of hydroxyl groups and carbohydrates, which can form hydrogen bonds and ionic bonds with other components in the coating film, increasing the adhesion and water resistance of the coating film. Placing cellulose and nano-zinc oxide into a plasma device for treatment, the high-energy particles in the plasma will bombard the surfaces of cellulose and nano-zinc oxide, causing microstructural changes such as grain refinement in cellulose and nano-zinc oxide, thereby helping to improve the mechanical properties of cellulose. At the same time, under the action of the plasma, a series of chemical reactions will occur on the surfaces of cellulose and nano-zinc oxide, such as the oxidation of carbon-hydrogen bonds and hydroxyl groups, etc., which helps to introduce new functional groups on the surface of cellulose, change the surface properties of cellulose, and improve the hydrophilicity, wettability and dispersibility of cellulose. Polyvinyl alcohol is a polymer material with characteristics such as light weight, high strength, and corrosion resistance. It can improve the water resistance and chemical resistance of the coating, enhance the adhesion and film-forming properties of the coating, and ensure that the coating can adhere tightly to the surface of wooden furniture, forming a strong protective film. 2,5-Furandimethanol is a biomass-based furan-derived compound with multiple functional groups such as hydroxyl groups, and has a relatively strong hydrogen bond-forming ability. These functional groups make it show good solubility and dispersibility in an aqueous environment, promote cellulose modification, enhance the adhesion and film-forming properties of the coating, improve the flexibility and wear resistance of the coating. At the same time, 2,5-furandimethanol has high volatility, which helps the rapid drying of the coating. The addition of nano-zinc oxide can enhance the mechanical properties of the coating, such as strength, hardness, etc., and at the same time endow the coating with excellent ultraviolet protection and antibacterial functions.

[0035] In the production process of the wooden furniture coating of the present invention, aerogel is added. The internal network structure of the aerogel is filled with gas. The aerogel has characteristics such as low thermal conductivity, low density, and high porosity, making the coating have heat insulation performance. In case of a fire, the aerogel can effectively isolate the flame and high temperature, reducing the heat transfer. The furniture coating added with aerogel can significantly improve the heat insulation performance of the furniture. The porous structure of the aerogel endows it with excellent sound wave absorption ability, so that the furniture coating added with aerogel can reduce noise pollution. At the same time, the porous structure of the aerogel can slow down the heat diffusion rate, delaying the furniture from being affected by high temperature. And the large specific surface area of the aerogel provides abundant adsorption sites, thereby adsorbing a large number of gas molecules and smoke particles, reducing the concentration of harmful gases at the fire scene, and reducing the harm of the fire to personnel and the environment.

[0036] The raw materials used in the present invention are all commercially available raw materials.

[0037] Example 1

[0038] A wood furniture coating, comprising the following components in parts by weight: 40 parts of waterborne alkyd resin, 15 parts of modified cellulose emulsion, 5 parts of polyethylene glycol, 3 parts of nano-clay, 1 part of aerogel, 1 part of sodium carboxymethyl cellulose, 9 parts of pigment (copper powder), and 40 parts of deionized water.

[0039] A preparation method of a wood furniture coating, comprising the following steps:

[0040] S1. Preparation of nano-clay: Clean and air-dry the surfaces of pyrophyllite and mullite, and then ball-mill them to 400 - 500 mesh respectively, with the rotation speed of the ball mill being 90 rpm; Weigh 35 parts by weight of ball-milled pyrophyllite and 15 parts by weight of mullite, mix them, add 55 parts by weight of deionized water, 4 parts by weight of sodium hydroxide, 2 parts by weight of 2,5-furan dimethanol, and 1 part by weight of N-hydroxysuccinimide, and then place them into a reaction kettle. React at 170 °C and 15 Mpa for 90 min; After cooling the mixture in the reaction kettle to room temperature, perform centrifugation, and then wash the pyrophyllite and mullite mixture successively with deionized water and ethanol (volume concentration of 80%) three times, followed by centrifugation. Then place it in a drying oven at 70 °C and dry for 8 h. After cooling to room temperature, grind and sieve to obtain nano-clay with a particle size of 60 - 80 nm.

[0041] S2. Preparation of modified cellulose emulsion: Weigh 38 parts by weight of cellulose and 10 parts by weight of nano-zinc oxide, mix them and place them into a plasma device for treatment for 4 min. Then add 45 parts by weight of deionized water into an ultrasonic device, add 1.5 parts by weight of polyvinyl alcohol and 0.5 parts by weight of 2,5-furan dimethanol, and perform ultrasonic treatment for 20 min to obtain a modified cellulose emulsion. The charge density of the plasma device is 1200 C / cm 3 , the gas flow rate is 1.5 L / min, the pressure is 100 kPa, and the temperature is 60 °C. The ultrasonic frequency of the ultrasonic device is 65 Hz, and the temperature is 45 °C.

[0042] S3. Preparation of aerogel: Weigh 30 parts by weight of waterborne acrylic resin, 20 parts by weight of polyacrylamide, 6 parts by weight of nano-silica (particle size of 60 - 80 nm), 3 parts by weight of sodium carboxymethyl cellulose, and 45 parts by weight of deionized water, and stir and mix them at 35 °C for 20 min to obtain a mixed solution; Perform freeze-drying and grinding on the mixed solution to obtain an aerogel with a particle size of 40 - 60 nm.

[0043] S4. Place the waterborne alkyd resin, polyethylene glycol, nano-clay, aerogel, sodium carboxymethyl cellulose, and deionized water in proportion into a dispersion kettle for dispersion to obtain a dispersed mixture. The rotation speed of the dispersion kettle is 2000 rpm, and the dispersion time is 60 min.

[0044] S5. Place the dispersed mixture in S4 into a wet grinder, add modified cellulose emulsion and pigments, and grind to obtain a wood furniture coating. The rotation speed of the wet grinder is 2500 rpm, and the grinding time is 45 min.

[0045] Example 2

[0046] A wood furniture coating, comprising the following components in parts by weight: 42 parts of waterborne alkyd resin, 18 parts of modified cellulose emulsion, 8 parts of polyethylene glycol, 4 parts of nano-clay, 2 parts of aerogel, 1.5 parts of sodium carboxymethyl cellulose, 12 parts of pigment (aluminum powder), and 45 parts of deionized water.

[0047] A preparation method of a wood furniture coating, comprising the following steps:

[0048] S1. Preparation of nano-clay: Clean and air-dry the surface of pyrophyllite and mullite, and then ball-mill them to 400-500 mesh respectively. The rotation speed of the ball mill is 100 rpm; weigh 40 parts by weight of ball-milled pyrophyllite and 20 parts by weight of mullite, mix them, add 60 parts by weight of deionized water, 6 parts by weight of sodium hydroxide, 3 parts by weight of 2,5-furandimethanol, and 3 parts by weight of N-hydroxysuccinimide, and then place them in a reaction kettle. React at 180 °C and 18 Mpa for 80 min; after cooling the mixture in the reaction kettle to room temperature, perform centrifugation, and then wash and centrifuge the pyrophyllite and mullite mixture successively with deionized water and ethanol (volume concentration of 85%) three times, and then place it in a drying oven at 75 °C for 7 h. After cooling to room temperature, grind and sieve to obtain nano-clay with a particle size of 60-80 nm.

[0049] S2. Preparation of modified cellulose emulsion: Weigh 40 parts by weight of cellulose and 12 parts by weight of nano-zinc oxide, mix them and place them in a plasma equipment for treatment for 3 min, then add 50 parts by weight of deionized water into an ultrasonic equipment, add 2 parts by weight of polyvinyl alcohol and 1 part by weight of 2,5-furandimethanol, and perform ultrasonic treatment for 15 min to obtain a modified cellulose emulsion. The charge density of the plasma equipment is 1250 C / cm 3 , the gas flow rate is 1.6 L / min, the pressure is 105 kPa, and the temperature is 65 °C. The ultrasonic frequency of the ultrasonic equipment is 70 Hz and the temperature is 50 °C.

[0050] S3. Preparation of aerogel: Weigh 32 parts by weight of waterborne acrylic resin, 25 parts by weight of polyacrylamide, 8 parts by weight of nano-silica (particle size of 60-80 nm), 5 parts by weight of sodium carboxymethyl cellulose, and 50 parts by weight of deionized water, place them at 40 °C and stir and mix for 15 min to obtain a mixed solution; perform freeze-drying and grinding on the mixed solution to obtain an aerogel with a particle size of 60 nm.

[0051] S4. Place the aqueous alkyd resin, polyethylene glycol, nano-clay, aerogel, sodium carboxymethyl cellulose, and deionized water in a dispersion kettle in proportion to obtain a dispersed mixture. The rotation speed of the dispersion kettle is 2200 rpm, and the dispersion time is 50 min.

[0052] S5. Place the dispersed mixture in S4 into a wet grinding machine, add a modified cellulose emulsion and pigments, and grind to obtain a wood furniture coating. The rotation speed of the wet grinding machine is 2600 rpm, and the grinding time is 40 min.

[0053] Example III

[0054] A wood furniture coating, comprising the following components in parts by weight: 41 parts of aqueous alkyd resin, 16 parts of modified cellulose emulsion, 6 parts of polyethylene glycol, 3.5 parts of nano-clay, 1.5 parts of aerogel, 1.2 parts of sodium carboxymethyl cellulose, 10 parts of pigment (iron powder), and 42 parts of deionized water.

[0055] A preparation method of a wood furniture coating, comprising the following steps:

[0056] S1. Preparation of nano-clay: Clean and air-dry the surface of pyrophyllite and mullite, and then ball-mill them to a mesh number of 400-500. The rotation speed of the ball mill is 95 rpm; weigh 36 parts by weight of ball-milled pyrophyllite and 16 parts by weight of mullite, mix them, add 58 parts by weight of deionized water, 5 parts by weight of sodium hydroxide, 2.5 parts by weight of 2,5-furandimethanol, and 2 parts by weight of N-hydroxysuccinimide, and place them in a reaction kettle. React at 175 °C and 16 Mpa for 85 min; cool the mixture in the reaction kettle to room temperature and then perform centrifugation. Then, wash the pyrophyllite and mullite mixture with deionized water and ethanol (volume concentration of 85%) three times in sequence, followed by centrifugation, and then place it in a drying oven at 72 °C for 7.5 h. After cooling to room temperature, grind and sieve to obtain nano-clay with a particle size of 60-80 nm.

[0057] S2. Preparation of modified cellulose emulsion: Weigh 39 parts by weight of cellulose and 11 parts by weight of nano-zinc oxide, mix them, and place them in a plasma device for treatment for 3.5 min. Then, add 48 parts by weight of deionized water into an ultrasonic device, add 1.8 parts by weight of polyvinyl alcohol and 0.8 parts by weight of 2,5-furandimethanol, and perform ultrasonic treatment for 18 min to obtain a modified cellulose emulsion. The charge density of the plasma device is 1240 C / cm 3 , the gas flow rate is 1.5 L / min, the pressure is 102 kPa, and the temperature is 62 °C. The ultrasonic frequency of the ultrasonic device is 68 Hz, and the temperature is 48 °C.

[0058] S3. Preparation of aerogel: Weigh 31 parts by weight of waterborne acrylic resin, 22 parts by weight of polyacrylamide, 7 parts by weight of nano-silica (particle size 60 - 80 nm), 4 parts by weight of sodium carboxymethyl cellulose, and 48 parts by weight of deionized water. Place them under stirring and mixing at 38 °C for 18 min to obtain a mixed solution; subject the mixed solution to freeze-drying and grinding to obtain an aerogel with a particle size of 40 - 60 nm.

[0059] S4. Place waterborne alkyd resin, polyethylene glycol, nano-clay, aerogel, sodium carboxymethyl cellulose, and deionized water in proportion in a dispersion kettle to obtain a dispersed mixture. The rotation speed of the dispersion kettle is 2100 rpm, and the dispersion time is 55 min.

[0060] S5. Place the dispersed mixture in S4 into a wet grinding machine, add modified cellulose emulsion and pigments for grinding to obtain a wood furniture coating. The rotation speed of the wet grinding machine is 2500 rpm, and the grinding time is 45 min.

[0061] Comparative Example 1:

[0062] The difference from Example 1 is that no nano-clay is added.

[0063] Comparative Example 2:

[0064] The difference from Example 1 is that no modified cellulose emulsion is added.

[0065] Comparative Example 3:

[0066] The difference from Example 1 is that the cellulose emulsion is not modified.

[0067] Comparative Example 4:

[0068] The difference from Example 1 is that no aerogel is added.

[0069] Apply the wood furniture coatings prepared in Example 1, 2, 3 and Comparative Examples 1, 2, 3, 4 on the wood surface. The coating thickness is 1.0 - 1.5 mm. After uniform coating, let it stand for more than 48 h. After the coating is completely cured into a film, conduct tests.

[0070] Determine the adhesion force by using GB / T 5210 - 2006 "Pull-off adhesion test", test the flame retardancy performance by using GB / T 2406.1 - 2008 "Determination of burning behavior by oxygen index method", determine the water contact angle by using the static contact angle method, determine the hardness by using GB / T6739 - 1996 "Pencil method for film hardness determination", and determine the abrasion resistance by using GB / T 1768 - 2006 "Paints and varnishes - Determination of abrasion resistance - Rotating rubber wheel method".

[0071] Table 1: Performance test table of wood furniture coatings

[0072]

[0073] As shown in Table 1, for the wood furniture coatings prepared in Examples 1, 2, and 3, their adhesion, limiting oxygen index, water contact angle, and pencil hardness have relatively large values, while their abrasion resistance has relatively small values. For the wood furniture coatings prepared in Comparative Examples 1, 2, and 3, their adhesion, water contact angle, pencil hardness, and abrasion resistance are poor, and for Comparative Example 4, its limiting oxygen index is poor.

[0074] Adhesion is the degree of firmness with which a coating binds to the surface of the object being coated through physical and chemical forces. The water contact angle is an important parameter for measuring the wetting performance of a liquid on a solid surface. The larger the water contact angle, the stronger the hydrophobicity of the solid surface, and the easier it is to prevent water. The greater the pencil hardness of the coating, the stronger its abrasion resistance. Nano-clay has a layered structure and a high specific surface area, which can significantly improve the rheological properties, mechanical properties, adhesion, and water resistance of the coating. Cellulose contains a large number of hydroxyl groups and carbohydrates, which can form hydrogen bonds and ionic bonds with other components in the coating film, increasing the adhesion and water resistance of the coating film. After cellulose is modified and added to the wood furniture coating, it can significantly enhance the adhesion, water resistance, flexibility, and abrasion resistance of the coating film, reduce the probability of cracks and cracking in the coating film, and improve the mechanical properties such as the strength and hardness of the coating.

[0075] The limiting oxygen index is an important indicator for characterizing the combustion behavior of a coating. It refers to the lowest oxygen concentration required for the coating to burn with a flame in a mixed oxygen-nitrogen gas stream under certain conditions. Aerogel has characteristics such as low thermal conductivity, low density, and high porosity, which endow the coating with heat insulation properties. In case of a fire, aerogel can effectively isolate the flame and high temperature and reduce the heat transfer.

[0076] For the furniture coatings prepared in Example 1 and Comparative Examples 1, 2, and 3, their water resistance was determined using GB / T 1733-93 "Method for Determining the Water Resistance of Paint Films", and the water resistance of the coatings was observed every 24 hours. The water resistance scoring standard for the coatings is shown in Table 2.

[0077] Table 2: Water Resistance Scoring Standard for Coatings

[0078]

[0079] As Figure 2 shown, the water resistance of Example 1 is better. The water resistance score of the coating film remains 100 points within 96 hours. The water resistance scores of the coating films of Comparative Example 1 and Comparative Example 2 dropped to 95.3 points and 92.1 points after 48 hours, and the water resistance score of the coating film of Comparative Example 3 dropped to 94.3 points after 72 hours. After 120 hours, the water resistance scores of the coating films of Example 1 and Comparative Examples 1, 2, and 3 were 95.7 points, 74.4 points, 73.5 points, and 84.4 points respectively.

[0080] Nanoclay has a layered structure and a high specific surface area, which can significantly improve the water resistance of coatings. After modification, cellulose enhances the adhesion and film-forming property of coatings, thereby enhancing the adhesion of the coating film.

[0081] In summary, the wood furniture coating prepared by the present invention has strong adhesion and wear resistance, is not easy to peel off, has fireproof and heat-insulating properties, and the raw materials used are all environmentally friendly raw materials, with low volatile organic compounds (VOCs), and have little impact on the body and the environment.

[0082] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A wood furniture coating, characterized in that: The invention comprises the following components in parts by weight: 40-42 parts of water-based alkyd resin, 15-18 parts of modified cellulose emulsion, 5-8 parts of polyethylene glycol, 3-4 parts of nano clay, 1-2 parts of aerogel, 1-1.5 parts of sodium carboxymethyl cellulose, 9-12 parts of pigment, and 40-45 parts of deionized water; The nano clay is prepared by mixing and reacting the following components in parts by weight: 35-40 parts of pyroxene, 15-20 parts of mullite, 4-6 parts of sodium hydroxide, 2-3 parts of 2,5-furan dimethanol, 1-3 parts of N-hydroxysuccinimide, and 55-60 parts of deionized water; The modified cellulose emulsion is prepared by mixing and modifying the following components in parts by weight: 38-40 parts of cellulose, 10-12 parts of nano zinc oxide, 1.5-2 parts of polyvinyl alcohol, 0.5-1 part of 2,5-furan dimethanol, and 45-50 parts of deionized water; The aerogel is prepared by mixing, freeze-drying and grinding the following components in parts by weight: 30-32 parts of aqueous acrylic resin, 20-25 parts of polyacrylamide, 6-8 parts of nano-silicon dioxide, 3-5 parts of sodium carboxymethyl cellulose and 45-50 parts of deionized water; The nano clay is prepared by the following method: cleaning and air-drying the surfaces of pyrope gemstone and mullite, respectively, and ball-milling them to a mesh size of 400-500; mixing the ball-milled pyrope gemstone and mullite in proportion, adding deionized water, sodium hydroxide, 2,5-furan dimethanol, and N-hydroxysuccinimide, and placing them in a reactor, reacting for 80-90 minutes at 170-180° C. and 15-18 Mpa; cooling the mixture in the reactor to room temperature and centrifuging it, then washing the mixture with deionized water and ethanol three times in sequence, centrifuging it, and placing it in a drying oven at a temperature of 70-75° C. and drying it for 7-8 hours, cooling it to room temperature, grinding it, and sieving it to obtain nano clay with a particle size of 60-80 nm; The modified cellulose emulsion is prepared by the following method: cellulose and nano zinc oxide are mixed in proportion and placed in a plasma device for treatment for 3 to 4 minutes, deionized water is added and placed in an ultrasonic device, polyvinyl alcohol and 2,5-furan dimethanol are added and ultrasonically treated for 15 to 20 minutes to obtain the modified cellulose emulsion; The aerogel is prepared by the following method: placing aqueous acrylic resin, polyacrylamide, nano silicon dioxide, sodium carboxymethyl cellulose and deionized water at 35-40° C. and stirring for 15-20 minutes to obtain a mixed solution; freeze-drying and grinding the mixed solution to obtain an aerogel with a particle size of 40-60 nm.

2. A wood furniture coating according to claim 1, characterized in that: The pigment is any one of copper powder, aluminum powder, iron powder and titanium dioxide.

3. A wood furniture coating according to claim 1, characterized in that: The particle size of the nano silicon dioxide is 60-80 nm.

4. The method for preparing a wood furniture coating according to claim 1, characterized in that: The following steps are involved: S1. The water-based alkyd resin, polyethylene glycol, nanoclay, aerogel, sodium carboxymethyl cellulose, and deionized water are placed in a dispersion kettle in proportion to obtain a dispersed mixture; S2. Place the dispersed mixture in S1 in a wet grinder, add modified cellulose emulsion and pigment, and grind to obtain wood furniture coating.

5. The method for preparing a wood furniture coating according to claim 4, characterized in that: The rotation speed of the ball mill is 90-100 rpm, and the volume concentration of ethanol is 80-85%.

6. The method for preparing a wood furniture coating according to claim 4, characterized in that: The charge density of the plasma equipment is 1200-1250C / cm 3 , gas flow rate is 1.5~1.6L / min, pressure is 100~105kPa, and temperature is 60~65℃.

7. The method for preparing a wood furniture coating according to claim 4, characterized in that: The ultrasonic equipment has an ultrasonic frequency of 65-70 Hz and a temperature of 45-50°C.

8. The method for preparing a wood furniture coating according to claim 4, characterized in that: The speed of the dispersion kettle is 2000-2200 rpm, and the dispersion time is 50-60 min.

9. The method for preparing a wood furniture coating according to claim 4, characterized in that: The rotation speed of the wet grinder is 2500-2600 rpm, and the grinding time is 40-45 min.

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