Wooden furniture coating and preparation method thereof

Abstract

The invention discloses a wooden furniture coating, which is prepared from the following ingredients in parts by weight: 40 to 42 parts of waterborne alkyd resin, 15 to 18 parts of modified cellulose emulsion, 5 to 8 parts of polyethylene glycol, 3 to 4 parts of nano clay, 1 to 2 parts of aerogel, 1 to 1.5 parts of sodium carboxymethyl cellulose, 9 to 12 parts of pigment and 40 to 45 parts of deionized water. The preparation method of the wood furniture coating comprises the following steps: dispersing and mixing the water-based alkyd resin, polyethylene glycol, nano clay, aerogel, sodium carboxymethyl cellulose and deionized water in proportion, putting the mixture into a wet grinding machine, adding the modified cellulose emulsion and the pigment, and grinding to obtain the wood furniture coating. The prepared wood furniture coating is high in adhesive force and wear resistance and not prone to peeling and falling off, the used raw materials are all environment-friendly raw materials, the volatile organic compounds (VOC) are low, and the influence on the body and the environment is small.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a wooden furniture coating and a preparation method thereof. Background Art

[0002] Wooden furniture is made of various woods as the main raw materials. In order to improve the beauty and durability of wooden furniture, a layer of protective coating is usually applied on the surface of the furniture. This can not only increase the color diversity and aesthetics of the furniture, but also improve the corrosion resistance of the furniture and extend the service life of the furniture.

[0003] As people's living standards improve, they have higher and higher requirements for the health, safety, comfort and environmental protection of furniture, which requires furniture manufacturers to be more and more strict in the selection of furniture coatings. In addition to being beautiful, stable and durable, furniture coatings are also considered to be healthy and environmentally friendly. However, the wood furniture coatings currently on the market have a strong odor and high VOC content, which have a great impact on health and the environment. In addition, the coatings have poor adhesion, are easy to peel off, and have poor wear resistance.

[0004] Therefore, the present invention provides a wooden furniture coating and a preparation method thereof to solve the problems of wooden furniture being environmentally friendly, having poor adhesion, being easy to peel off, and having poor wear resistance. Summary of the invention

[0005] The purpose of the present invention is to provide a wood furniture coating and a preparation method thereof, so as to solve the problems of the wood furniture coating mentioned in the above background technology, namely, strong odor, high VOC content, great impact on the environment, poor coating adhesion, easy peeling and poor wear resistance.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a wood furniture coating, comprising 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.

[0007] Furthermore, the nanoclay 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.

[0008] Furthermore, 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.

[0009] Furthermore, 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.

[0010] Furthermore, the preparation method of the wood furniture coating comprises the following steps: S1. Preparation of nanoclay: clean and air-dry the surfaces of pyroxene and mullite, then ball-mill them to a mesh size of 400-500 respectively; mix the ball-milled pyroxene and mullite in proportion, add deionized water, sodium hydroxide, 2,5-furan dimethanol and N-hydroxysuccinimide, and place them in a reactor, and react for 80-90 min at 170-180°C and 15-18 MPa; cool the mixture in the reactor to room temperature and centrifuge it, then wash it with deionized water and ethanol three times in sequence, centrifuge it, and place the mixture of pyroxene and mullite in a drying oven at a temperature of 70-75°C to dry it for 7-8 hours, cool it to room temperature, grind it, and sieve it to obtain nanoclay with a particle size of 60-80 nm.

[0011] S2. Preparation of modified cellulose emulsion: 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 mixed, and then placed in an ultrasonic device, polyvinyl alcohol and 2,5-furan dimethanol are added and ultrasonically treated for 15 to 20 minutes to obtain a modified cellulose emulsion.

[0012] S3. Preparation of aerogel: Place aqueous acrylic resin, polyacrylamide, nano-silica, sodium carboxymethyl cellulose and deionized water at 35-40°C and stir for 15-20 minutes to obtain a mixed solution; freeze-dry and grind the mixed solution to obtain an aerogel with a particle size of 40-60 nm.

[0013] S4. Place water-based alkyd resin, polyethylene glycol, nanoclay, aerogel, sodium carboxymethyl cellulose and deionized water in a dispersion kettle in proportion and disperse them to obtain a dispersed mixture.

[0014] S5. Place the dispersed mixture in S4 in a wet grinder, add modified cellulose emulsion and pigment, and grind to obtain wood furniture coating.

[0015] As a preferred technical solution of the present invention, the pigment is any one of copper powder, aluminum powder, iron powder and titanium dioxide.

[0016] 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%.

[0017] As a preferred technical solution of the present invention, 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℃.

[0018] As a preferred technical solution of the present invention, the ultrasonic frequency of the ultrasonic equipment is 65-70 Hz and the temperature is 45-50°C.

[0019] As a preferred technical solution of the present invention, the particle size of the nano-silicon dioxide is 60 to 80 nm.

[0020] 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.

[0021] 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.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. The pyrope gemstone has good anti-cracking performance and adhesion. Mullite has high hardness and wear resistance, can improve the fluidity of the coating, make the coating easier to process and shape, improve the surface finish and flatness of the coating, and add it to the coating to significantly improve the hardness and wear resistance of the coating. In the process of making nanoclay, 2,5-furan dimethanol and N-hydroxysuccinimide are added in an alkaline environment of sodium hydroxide, which can promote the phase change or reconstruction of pyrope gemstone and mullite, and grain refinement, thereby making nanoclay. The nanoclay prepared by the present invention has excellent adhesive properties, can significantly improve the viscosity of the coating, and make the coating easier to construct. At the same time, nanoclay can reduce the friction resistance of the pigment and filler in the coating, so that the pigment and filler are more evenly dispersed in the coating, and the uniformity and stability of the coating are improved. Nanoclay has a layered structure and a high specific surface area, which can significantly improve the rheology, mechanical properties, adhesion, water resistance and wear resistance of the coating.

[0023] 2. Plasma treatment causes microstructural changes such as grain refinement in cellulose and nano zinc oxide, which helps to improve the mechanical properties of cellulose; at the same time, under the action of plasma, a series of chemical reactions will occur on the surface of cellulose and nano zinc oxide, 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 can improve the water resistance and chemical resistance of the coating, and enhance the adhesion and film-forming properties of the coating. 2,5-Furan dimethanol has multiple functional groups such as hydroxyl groups, and has a relatively strong hydrogen bond forming ability, 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-Furan dimethanol is volatile, which helps the coating to dry quickly. The addition of nano zinc oxide can enhance the mechanical properties of cellulose materials, such as strength and hardness, and at the same time give the coating excellent UV protection and antibacterial functions. After modified cellulose is added to wood furniture coatings, the adhesion, water resistance, flexibility and wear resistance of the coating can be significantly enhanced, the chance of cracks and cracking in the coating can be reduced, the strength, hardness and other mechanical properties of the coating can be improved, and at the same time, the coating can be given excellent UV protection and antibacterial functions.

[0024] 3. The present invention adds aerogels during the production of wood furniture coatings. Aerogels have the characteristics of low thermal conductivity, low density, high porosity, etc., which make the coatings have heat insulation properties. When a fire occurs, aerogels can effectively isolate flames and high temperatures and reduce heat transfer. The porous structure of aerogels gives it excellent sound wave absorption capacity, so that furniture coatings with aerogels added can reduce noise pollution; at the same time, the porous structure of aerogels can slow down the diffusion rate of heat and delay furniture from being affected by high temperatures; and aerogels have a large specific surface area and can absorb a large number of gas molecules and smoke particles, reducing the concentration of harmful gases at the fire scene and reducing the harm of fire to people and the environment.

[0025] 4. The raw materials used in the present invention are all environmentally friendly raw materials with low volatile organic compounds (VOC) and little impact on the body and the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flow chart for preparing the coating for wooden furniture; Figure 2 It is a line graph of water resistance of the coating of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, a method for preparing a wood furniture coating comprises the following steps: S1. Preparation of nano clay: cleaning and air-drying the surfaces of pyrope and mullite, respectively, and ball-milling them to a mesh size of 400-500; mixing the ball-milled pyrope 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 15-18Mpa; cooling the mixture in the reactor to room temperature and centrifuging it, then washing with deionized water and ethanol three times in sequence, centrifuging the pyrope and mullite mixture, and placing it in a drying oven at a temperature of 70-75°C for 7-8 hours, cooling it to room temperature, and grinding and sieving it 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 to 4 minutes, then add deionized water and place them in an ultrasonic device, add polyvinyl alcohol and 2,5-furan dimethanol and perform ultrasonic treatment to obtain modified cellulose emulsion. S3. Preparation of aerogel: Stir and mix water-based acrylic resin, polyacrylamide, nano silicon dioxide, sodium carboxymethyl cellulose and deionized water at 35 to 40°C to obtain a mixed solution; freeze-dry and grind the mixed solution to obtain aerogel. S4. Place water-based alkyd resin, polyethylene glycol, nano clay, aerogel, sodium carboxymethyl cellulose and deionized water in a dispersion kettle in proportion to obtain a dispersed mixture. S5. Place the dispersed mixture in S4 in a wet grinder, add modified cellulose emulsion and pigment and grind to obtain wood furniture coating.

[0029] Nanoclay has excellent adhesive properties, which can significantly improve the viscosity of the paint, making the paint easier to apply and construct, and reducing flow; at the same time, the lubricating effect of nanoclay can reduce the friction resistance of pigments and fillers in the paint, making the pigments and fillers more evenly dispersed in the paint, thereby improving the uniformity and stability of the paint; and nanoclay has a layered structure and a high specific surface area, which can significantly improve the rheology, mechanical properties, adhesion and water resistance of the paint.

[0030] The invention comprises the following steps: grinding pyrosil and mullite to a certain particle size, adding sodium hydroxide, 2,5-furan dimethanol and N-hydroxysuccinimide, reacting under high temperature and high pressure, and then centrifuging, washing and grinding to obtain nano clay. Pyrosil is a mixture of various aluminum silicates, the main chemical components of which are aluminum oxide and silicon dioxide, and also contains alkali, alkaline earth and oxides such as iron and titanium, as well as some organic matter. Pyrosil has good anti-cracking performance and adhesion. Mullite is mainly composed of aluminum silicates, with the chemical formula of 3Al2O3·2SiO2 or 2Al2O3·SiO2, mainly containing aluminum oxide and silicon dioxide, and also containing TiO2 and Fe2O3. Mullite can improve the fluidity of the coating, improve the surface finish and flatness of the coating, and make the surface of the furniture more beautiful and smooth; at the same time, mullite has high hardness and wear resistance, and 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 easy to be scratched or worn. In the process of preparing nano-clay, 2,5-furan dimethanol and N-hydroxysuccinimide are added in an alkaline environment of sodium hydroxide, which can promote the phase transformation or reconstruction of pyroxene and mullite and grain refinement, thereby preparing nano-clay and improving the rheological properties, mechanical properties, adhesion, water resistance and wear resistance of the coating.

[0031] Cellulose is a natural polymer compound with good biocompatibility and biodegradability. Cellulose can form a network structure in the coating, increase the viscosity of the coating, improve the rheological properties of the coating, and make it easier to apply. At the same time, cellulose can also bridge the cracks and tiny defects on the surface of the coating to avoid cracks and cracks in the coating. 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 to increase the adhesion and water resistance of the coating. Cellulose and nano zinc oxide are placed in a plasma device for treatment. The high-energy particles in the plasma will bombard the surface of cellulose and nano zinc oxide, causing microstructural changes such as grain refinement in cellulose and nano zinc oxide, which helps to improve the mechanical properties of cellulose. At the same time, under the action of plasma, a series of chemical reactions will occur on the surface of cellulose and nano zinc oxide, such as oxidation of carbon-hydrogen bonds and hydroxyl groups, 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 the characteristics of 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 to form a solid protective film. 2,5-Furan dimethanol is a biomass-based furan derivative compound with multiple functional groups, such as hydroxyl groups, and has a relatively strong ability to form hydrogen bonds. These functional groups make it exhibit good solubility and dispersibility in aqueous environments, 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-Furan dimethanol is volatile and helps the coating to dry quickly. The addition of nano zinc oxide can enhance the mechanical properties of the coating, such as strength and hardness, while giving the coating excellent UV protection and antibacterial functions.

[0032] The present invention adds aerogels during the production process of wood furniture coatings. The internal network structure of the aerogels is filled with gas. The aerogels have the characteristics of low thermal conductivity, low density, high porosity, etc., which make the coatings have heat insulation properties. When a fire occurs, the aerogels can effectively isolate the flames and high temperatures and reduce the transfer of heat. The furniture coatings with aerogels added can significantly improve the thermal insulation properties of the furniture. The porous structure of the aerogels gives it excellent sound wave absorption capacity, so that the furniture coatings with aerogels added can reduce noise pollution; at the same time, the porous structure of the aerogels can slow down the diffusion rate of heat and delay the furniture from being affected by high temperatures; and the aerogels have a large specific surface area, which provides them with 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 people and the environment.

[0033] The raw materials used in the present invention are all commercially available raw materials.

[0034] Embodiment 1

[0035] A wood furniture coating comprises the following components in parts by weight: 40 parts of water-based 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.

[0036] A method for preparing a wood furniture coating comprises the following steps: S1. Preparation of nanoclay: After cleaning and air-drying the surfaces of pyrotechnics and mullite, they are respectively ball-milled to a mesh size of 400-500, and the speed of the ball mill is 90 rpm; 35 parts by weight of pyrotechnics and 15 parts by weight of mullite after ball milling are weighed, mixed, 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 are added, and then placed in a reactor, and reacted at 170°C and 15 MPa for 90 minutes; the mixture in the reactor is cooled to room temperature and centrifuged, and then washed with deionized water and ethanol (volume concentration of 80%) for 3 times, centrifuged, and the mixture of pyrotechnics and mullite is placed in a drying oven at a temperature of 70°C and dried for 8 hours, cooled to room temperature, ground, and sieved to obtain nanoclay with a particle size of 60-80 nm.

[0037] S2. Preparation of modified cellulose emulsion: Weigh 38 parts by weight of cellulose and 10 parts by weight of nano zinc oxide, mix and place in a plasma device for 4 minutes, then add 45 parts by weight of deionized water and place in an ultrasonic device, add 1.5 parts by weight of polyvinyl alcohol and 0.5 parts by weight of 2,5-furan dimethanol and ultrasonically treat for 20 minutes to obtain a modified cellulose emulsion. The charge density of the plasma device is 1200C / cm 3 , gas flow rate is 1.5L / min, pressure is 100kPa, temperature is 60℃, ultrasonic equipment ultrasonic frequency is 65Hz, temperature is 45℃.

[0038] S3. Preparation of aerogel: Weigh 30 parts by weight of aqueous acrylic resin, 20 parts by weight of polyacrylamide, 6 parts by weight of nano-silicon dioxide (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 at 35°C for 20 minutes to obtain a mixed solution; freeze-dry the mixed solution and grind it to obtain an aerogel with a particle size of 40-60 nm.

[0039] S4. Place water-based alkyd resin, polyethylene glycol, nanoclay, aerogel, sodium carboxymethyl cellulose and deionized water in a dispersion kettle in proportion to obtain a dispersed mixture. The speed of the dispersion kettle is 2000 rpm and the dispersion time is 60 min.

[0040] S5. The dispersed mixture in S4 is placed in a wet grinder, and the modified cellulose emulsion and pigment are added thereto for grinding to obtain a wood furniture coating. The speed of the wet grinder is 2500 rpm, and the grinding time is 45 min.

[0041] Embodiment 2

[0042] A wood furniture coating comprises the following components in parts by weight: 42 parts of water-based 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.

[0043] A method for preparing a wood furniture coating comprises the following steps: S1. Preparation of nanoclay: After cleaning and air-drying the surfaces of pyrotechnics and mullite, they are respectively ball-milled to a mesh size of 400-500, and the speed of the ball mill is 100 rpm; 40 parts by weight of the ball-milled pyrotechnics and 20 parts by weight of mullite are weighed and mixed, 60 parts by weight of deionized water, 6 parts by weight of sodium hydroxide, 3 parts by weight of 2,5-furan dimethanol, and 3 parts by weight of N-hydroxysuccinimide are added, and then placed in a reactor, and reacted at 180°C and 18 MPa for 80 min; the mixture in the reactor is cooled to room temperature and centrifuged, and then washed with deionized water and ethanol (volume concentration of 85%) for 3 times, centrifuged, and the mixture of pyrotechnics and mullite is placed in a drying oven at a temperature of 75°C and dried for 7 hours, cooled to room temperature, ground, and sieved to obtain nanoclay with a particle size of 60-80 nm.

[0044] S2. Preparation of modified cellulose emulsion: Weigh 40 parts by weight of cellulose and 12 parts by weight of nano zinc oxide, mix and place in a plasma device for 3 minutes, then add 50 parts by weight of deionized water and place in an ultrasonic device, add 2 parts by weight of polyvinyl alcohol and 1 part by weight of 2,5-furan dimethanol and ultrasonically treat for 15 minutes to obtain a modified cellulose emulsion. The charge density of the plasma device is 1250C / cm 3 , gas flow rate is 1.6L / min, pressure is 105kPa, temperature is 65℃, ultrasonic equipment ultrasonic frequency is 70Hz, temperature is 50℃.

[0045] S3. Preparation of aerogel: Weigh 32 parts by weight of aqueous acrylic resin, 25 parts by weight of polyacrylamide, 8 parts by weight of nano-silicon dioxide (particle size of 60-80 nm), 5 parts by weight of sodium carboxymethyl cellulose, and 50 parts by weight of deionized water, stir and mix at 40°C for 15 minutes to obtain a mixed solution; freeze-dry the mixed solution and grind it to obtain an aerogel with a particle size of 60 nm.

[0046] S4. Place water-based alkyd resin, polyethylene glycol, nanoclay, aerogel, sodium carboxymethyl cellulose and deionized water in a dispersion kettle in proportion and disperse them to obtain a dispersed mixture. The speed of the dispersion kettle is 2200 rpm and the dispersion time is 50 min.

[0047] S5. The dispersed mixture in S4 is placed in a wet grinder, and the modified cellulose emulsion and pigment are added thereto for grinding to obtain a wood furniture coating. The speed of the wet grinder is 2600 rpm, and the grinding time is 40 min.

[0048] Embodiment 3

[0049] A wood furniture coating comprises the following components in parts by weight: 41 parts of water-based 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.

[0050] A method for preparing a wood furniture coating comprises the following steps: S1. Preparation of nano clay: After cleaning and air-drying the surfaces of pyrotechnics and mullite, they are respectively ball-milled to a mesh size of 400-500, and the speed of the ball mill is 95 rpm; 36 parts by weight of pyrotechnics and 16 parts by weight of mullite after ball milling are weighed, mixed, 58 parts by weight of deionized water, 5 parts by weight of sodium hydroxide, 2.5 parts by weight of 2,5-furan dimethanol, and 2 parts by weight of N-hydroxysuccinimide are added, and then placed in a reactor, and reacted at 175°C and 16 MPa for 85 minutes; the mixture in the reactor is cooled to room temperature and centrifuged, and then washed with deionized water and ethanol (volume concentration of 85%) for 3 times, centrifuged, and the mixture of pyrotechnics and mullite is placed in a drying oven at a temperature of 72°C and dried for 7.5 hours, cooled to room temperature, ground, and sieved to obtain nano clay with a particle size of 60-80 nm.

[0051] S2. Preparation of modified cellulose emulsion: 39 parts by weight of cellulose and 11 parts by weight of nano zinc oxide were weighed and mixed, and then placed in a plasma device for treatment for 3.5 minutes. Then, 48 parts by weight of deionized water were added and placed in an ultrasonic device. 1.8 parts by weight of polyvinyl alcohol and 0.8 parts by weight of 2,5-furan dimethanol were added and ultrasonically treated for 18 minutes to obtain a modified cellulose emulsion. The charge density of the plasma device was 1240C / cm 3 , gas flow rate is 1.5L / min, pressure is 102kPa, temperature is 62℃, ultrasonic equipment ultrasonic frequency is 68Hz, temperature is 48℃.

[0052] S3. Preparation of aerogel: Weigh 31 parts by weight of aqueous acrylic resin, 22 parts by weight of polyacrylamide, 7 parts by weight of nano-silicon dioxide (particle size of 60-80 nm), 4 parts by weight of sodium carboxymethyl cellulose, and 48 parts by weight of deionized water, and stir and mix at 38°C for 18 minutes to obtain a mixed solution; freeze-dry the mixed solution and grind it to obtain an aerogel with a particle size of 40-60 nm.

[0053] S4. Place water-based alkyd resin, polyethylene glycol, nanoclay, aerogel, sodium carboxymethyl cellulose and deionized water in a dispersion kettle in proportion and disperse them to obtain a dispersed mixture. The speed of the dispersion kettle is 2100 rpm and the dispersion time is 55 min.

[0054] S5. The dispersed mixture in S4 is placed in a wet grinder, and the modified cellulose emulsion and pigment are added thereto for grinding to obtain a wood furniture coating. The speed of the wet grinder is 2500 rpm, and the grinding time is 45 min.

[0055] Comparative Example 1: The difference from the first embodiment is that no nano clay is added.

[0056] Comparative Example 2: The difference from Example 1 is that no modified cellulose emulsion is added.

[0057] Comparative Example 3: The difference from Example 1 is that the cellulose emulsion is not modified.

[0058] Comparative Example 4: The difference from the first embodiment is that no aerogel is added.

[0059] The wood furniture coatings prepared in Examples 1, 2, 3 and Comparative Examples 1, 2, 3 and 4 were applied on the wood surface with a coating thickness of 1.0 to 1.5 mm. After uniform coating, the coating was allowed to stand for more than 48 hours until the coating was completely cured into a film before testing.

[0060] The adhesion was determined by GB / T 5210-2006 "Pull-off adhesion test", the flame retardant performance was tested by GB / T 2406.1-2008 "Determination of burning behavior by oxygen index method", the water contact angle was determined by static contact angle method, the hardness was determined by GB / T6739-1996 "Coating hardness pencil test method", and the wear resistance was determined by GB / T 1768-2006 "Determination of abrasion resistance of paints and varnishes - rotating rubber grinding wheel method".

[0061] Table 1: Wood furniture coating performance test table

[0062] As shown in Table 1, the wood furniture coatings prepared in Examples 1, 2 and 3 have large values ​​of adhesion, limiting oxygen index, water contact angle and pencil hardness, and small values ​​of wear resistance. The wood furniture coatings prepared in Comparative Examples 1, 2 and 3 have poor adhesion, water contact angle, pencil hardness and wear resistance, and the limiting oxygen index of Comparative Example 4 is poor.

[0063] Adhesion is the degree of firmness of the coating and the surface of the object being coated by physical and chemical forces. The water contact angle is an important parameter to measure the wetting performance of the liquid on the solid surface. The larger the water contact angle, the more hydrophobic the solid surface is, the easier it is to resist water, and the greater the pencil hardness of the coating, the stronger the wear resistance. Nanoclay 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 wood furniture coatings, it can significantly enhance the adhesion, water resistance, flexibility and wear resistance of the coating film, reduce the probability of cracks and cracking of the coating film, and improve the strength, hardness and other mechanical properties of the coating.

[0064] The limiting oxygen index is an important indicator for characterizing the combustion behavior of coatings. It refers to the minimum oxygen concentration required for the coating to burn with flames in an oxygen-nitrogen mixed gas flow under certain conditions. Aerogel has the characteristics of low thermal conductivity, low density, and high porosity, which make the coating have thermal insulation properties. When a fire occurs, aerogel can effectively isolate flames and high temperatures and reduce heat transfer.

[0065] The furniture coatings prepared in Example 1 and Comparative Examples 1, 2 and 3 were tested for water resistance using GB / T 1733-93 "Determination of water resistance of paint films". The water resistance of the coatings was observed every 24 hours. The scoring standard for water resistance of the coatings is shown in Table 2.

[0066] Table 2: Water resistance rating criteria for coatings

[0067] like Figure 2 As shown, Example 1 has good water resistance, and the water resistance score of the coating is still 100 points within 96 hours. The 48-hour water resistance score of the coating of Comparative Example 1 and Comparative Example 2 is reduced to 95.3 points and 92.1 points, and the 72-hour water resistance score of the coating of Comparative Example 3 is reduced to 94.3 points. After 120 hours, the water resistance scores of the coatings of Example 1 and Comparative Examples 1, 2, and 3 are 95.7 points, 74.4 points, 73.5 points, and 84.4 points, respectively.

[0068] Nanoclay has a layered structure and a high specific surface area, which can significantly improve the water resistance of the coating. The modified cellulose enhances the adhesion and film-forming properties of the coating, thereby enhancing the adhesion of the coating film.

[0069] In summary, the wood furniture paint 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 lower volatile organic compounds (VOC), which has less impact on the body and the environment.

[0070] 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 replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in 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.

2. The method for preparing a wood furniture coating according to claim 1, characterized in that: The following steps are involved: S1. Preparation of nanoclay: After cleaning and air-drying the surfaces of pyrotechnics and mullite, they are respectively ball-milled to a mesh size of 400-500; the ball-milled pyrotechnics and mullite are mixed in proportion, deionized water, sodium hydroxide, 2,5-furan dimethanol, and N-hydroxysuccinimide are added, and the mixture is placed in a reactor, and reacted at 170-180°C and 15-18Mpa for 80-90min; the mixture in the reactor is cooled to room temperature and centrifuged, and then washed with deionized water and ethanol three times in sequence, centrifuged, and the mixture of pyrotechnics and mullite is placed in a drying oven at a temperature of 70-75°C and dried for 7-8h, cooled to room temperature, ground, and sieved to obtain nanoclay with a particle size of 60-80nm; S2. Preparation of modified cellulose emulsion: cellulose and nano zinc oxide were mixed in proportion and placed in a plasma device for treatment for 3 to 4 minutes, deionized water was added and placed in an ultrasonic device, polyvinyl alcohol and 2,5-furan dimethanol were added and ultrasonically treated for 15 to 20 minutes to obtain a modified cellulose emulsion; S3. Preparation of aerogel: Aqueous acrylic resin, polyacrylamide, nano-silica, sodium carboxymethyl cellulose and deionized water were stirred and mixed at 35 to 40°C for 15 to 20 minutes to obtain a mixed solution; the mixed solution was freeze-dried and ground to obtain an aerogel with a particle size of 40 to 60 nm; S4. 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; S5. Place the dispersed mixture in S4 in a wet grinder, add modified cellulose emulsion and pigment, and grind to obtain wood furniture coating.

3. 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.

4. The method for preparing a wood furniture coating according to claim 2, characterized in that: The rotation speed of the ball mill is 90-100 rpm, and the volume concentration of ethanol is 80-85%.

5. The method for preparing a wood furniture coating according to claim 2, 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℃.

6. The method for preparing a wood furniture coating according to claim 2, characterized in that: The ultrasonic equipment has an ultrasonic frequency of 65-70 Hz and a temperature of 45-50°C.

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

8. The method for preparing a wood furniture coating according to claim 2, 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 2, 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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