Formaldehyde-removing antibacterial coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a formaldehyde-removing antibacterial coating as well as a preparation method and application thereof. The formaldehyde-removing antibacterial coating is prepared on site after being used, and is prepared from the following raw materials in parts by mass: 60-95 parts of micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, 5-30 parts of thermosetting resin, 10-15 parts of a curing agent, 1-3 parts of a dispersing agent, 1-5 parts of a flatting agent and 25-50 parts of an organic solvent, the mass ratio of the micron diatomite to the nano calcium peroxide to the nano titanium dioxide in the micron diatomite loaded with the nano calcium peroxide and the nano titanium dioxide is (50-70): (5-15): (5-10); the organic solvent comprises a polar organic solvent and / or a non-polar organic solvent. Through the synergistic effect of the nano calcium peroxide, the nano titanium dioxide and the micron diatomite, the formaldehyde-removing antibacterial coating has long-acting antibacterial and formaldehyde-removing capabilities, and can effectively purify indoor air for a long time.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a formaldehyde-removing and antibacterial coating, a preparation method thereof, and an application thereof. Background Art

[0002] Formaldehyde is the largest source of indoor air pollution. Since formaldehyde is widely used in building decoration materials, furniture, and various auxiliary materials, including plywood, wood-based panels, medium-density fiberboards, particleboards, indoor furniture, white latex, foam plastics, coatings, wall coverings, wallpapers, chemical fiber carpets, curtains, fabric furniture, etc. Therefore, these materials inevitably become a wide source of formaldehyde release indoors. The release of formaldehyde is affected by factors such as environmental temperature and humidity, and the general release time ranges from 3 to 15 years. Therefore, after decoration, the harm of formaldehyde to human health cannot be eliminated just by ventilating for a period of time. However, the existing coatings have unstable purification effects in complex environments, and with the increase of the exposure time in the air, problems such as weakened antibacterial effects and formaldehyde removal ability are likely to occur, making it difficult to meet the needs of long-term use. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a formaldehyde-removing and antibacterial coating, a preparation method thereof, and an application thereof. The formaldehyde-removing and antibacterial coating has long-term antibacterial and formaldehyde removal abilities and can effectively purify indoor air for a long time.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] The present invention provides a formaldehyde-removing and antibacterial coating, which is prepared and used immediately, and comprises the following raw materials in parts by mass:

[0006] 60-95 parts of micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide, 5-30 parts of thermosetting resin, 10-15 parts of curing agent, 1-3 parts of dispersant, 1-5 parts of leveling agent, and 25-50 parts of organic solvent;

[0007] In the micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide, the mass ratio of micron-sized diatomite, nano-calcium peroxide, and nano-titanium dioxide is (50-70):(5-15):(5-10);

[0008] The organic solvent includes polar organic solvents and / or non-polar organic solvents.

[0009] Preferably, the specific surface area of the micron-sized diatomite is 50-200 m 2 / g.

[0010] Preferably, the dispersant is one or more of polycarboxylic acid type dispersants, polyether modified type dispersants, and fluorinated acrylate block copolymers.

[0011] Preferably, the thermosetting resin is an acrylic resin and / or an amino resin.

[0012] Preferably, the curing agent is an amine curing agent; the amine curing agent includes an unmodified amine curing agent and / or a modified amine curing agent; the unmodified amine curing agent is a fatty amine curing agent and / or an aromatic amine curing agent.

[0013] Preferably, the polar organic solvent is butyl acetate and / or acetone; the non-polar organic solvent is xylene.

[0014] The present invention also provides a method for preparing the formaldehyde-removing and antibacterial coating according to the above technical solution, comprising the following steps:

[0015] Mix micron-sized diatomaceous earth, nano calcium peroxide and nano titanium dioxide for loading to obtain micron-sized diatomaceous earth loaded with nano calcium peroxide and nano titanium dioxide;

[0016] Mix the micron-sized diatomaceous earth loaded with nano calcium peroxide and nano titanium dioxide, the thermosetting resin, the curing agent, the dispersant, the leveling agent and the organic solvent to obtain the formaldehyde-removing and antibacterial coating.

[0017] Preferably, the loading method is ultrasonic treatment or stirring.

[0018] Preferably, the power of the ultrasonic treatment is 100-1000 W, the temperature is 20-50 °C, and the time is 5-30 min;

[0019] The stirring is magnetic stirring or mechanical stirring; the rotation speed of the magnetic stirring is 300-1200 rpm; the rotation speed of the mechanical stirring is 500-3000 rpm; the temperature of the stirring is 25-80 °C; the time of the stirring is 30-60 min.

[0020] The present invention also provides the application of the formaldehyde-removing and antibacterial coating according to the above technical solution or the formaldehyde-removing and antibacterial coating prepared by the above technical solution preparation method in interior decoration.

[0021] The present invention provides a formaldehyde-removing and antibacterial coating, which is prepared immediately before use and comprises the following raw materials in parts by mass: 60-95 parts of micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide, 5-30 parts of thermosetting resin, 10-15 parts of curing agent, 1-3 parts of dispersant, 1-5 parts of leveling agent, and 25-50 parts of organic solvent; the mass ratio of micron-sized diatomite, nano-calcium peroxide and nano-titanium dioxide in the micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide is (50-70):(5-15):(5-10); the organic solvent includes polar organic solvent and / or non-polar organic solvent. In the present invention, the micron-sized diatomite has a large specific surface area and abundant pores. Not only can it, as a loading material, improve the stability and dispersibility of nano-calcium peroxide and nano-titanium dioxide, avoid particle agglomeration, and ensure the long-term functionality of the coating, but also it can effectively adsorb formaldehyde molecules in the air. After the adsorbed formaldehyde is photocatalyzed by nano-titanium dioxide, it is decomposed into harmless carbon dioxide and water under ultraviolet irradiation; nano-calcium peroxide can decompose to generate reactive oxygen species such as hydrogen peroxide and hydroxyl radicals under humid conditions. These radicals can effectively destroy the cell walls and cell membranes of bacteria and kill bacteria. Titanium dioxide can generate more reactive radicals under ultraviolet irradiation, and the hydrogen peroxide released by calcium peroxide can also be decomposed under the catalytic action of nano-titanium dioxide, enhancing the generation rate of radicals, thereby improving the long-term antibacterial and formaldehyde-removing capabilities, and can effectively purify indoor air for a long time, especially suitable for newly decorated indoor environments. Detailed implementation mode

[0022] The present invention provides a formaldehyde-removing and antibacterial coating, which is prepared immediately before use and comprises the following raw materials in parts by mass:

[0023] 60-95 parts of micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide, 5-30 parts of thermosetting resin, 10-15 parts of curing agent, 1-3 parts of dispersant, 1-5 parts of leveling agent, and 25-50 parts of organic solvent;

[0024] The mass ratio of micron-sized diatomite, nano-calcium peroxide and nano-titanium dioxide in the micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide is (50-70):(5-15):(5-10);

[0025] The organic solvent includes polar organic solvent and / or non-polar organic solvent.

[0026] Unless otherwise specified, the present invention has no special requirements for the sources of the raw materials used, and commercially available products well-known to those skilled in the art can be used.

[0027] The raw materials for preparing the formaldehyde-removing and antibacterial coating provided by the present invention include 60-95 parts by mass of micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide, specifically 65-90 parts in specific embodiments. As an implementation manner, the mass ratio of micron-sized diatomite, nano-calcium peroxide and nano-titanium dioxide in the micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide is (50-70):(5-15):(5-10), specifically (55-65):(5-10):(5-8) in specific embodiments; the specific surface area of the micron-sized diatomite is 50-200 m 2 / g, specifically 100-200 m 2 / g in specific embodiments; the particle size of the micron-sized diatomite is 1-5 μm, specifically 2-5 μm in specific embodiments, the porosity is 80-95%, specifically 90-95% in specific embodiments, and the pore diameter is 50-200 nm, specifically 50-100 nm in specific embodiments; the particle size of the nano-calcium peroxide is 50-200 nm, specifically 100-200 nm in specific embodiments, and the specific surface area is 80-100 m 2 / g, specifically 80-90 m 2 / g in specific embodiments; the particle size of the nano-titanium dioxide is 20-50 nm, specifically 20-30 nm in specific embodiments, and the specific surface area is 200-500 m 2 / g, specifically 200-300 m 2 / g in specific embodiments.

[0028] In the present invention, the micron-sized diatomite loaded with nano-calcium peroxide and nano-titanium dioxide means that nano-calcium peroxide and nano-titanium dioxide are loaded on the surface and inside the pores of the micron-sized diatomite by electrostatic adsorption.

[0029] Calcium peroxide (CaO2) slowly releases hydrogen peroxide (H2O2) under the action of moisture, and this process can continuously provide antibacterial active substances. Nano-titanium dioxide (TiO2) produces photocatalysis under ultraviolet or visible light irradiation, promoting the separation of electrons (e - ) and holes (h + ), causing the water molecules (H2O) to undergo oxidation-reduction reactions, and further generating hydroxyl radicals (·OH) and superoxide anion radicals (O2 - ·). These active species have extremely strong oxidation ability and can effectively destroy bacterial cell walls, proteins and nucleic acids, thus achieving a high-efficiency bactericidal effect. The hydrogen peroxide (H2O2) released by calcium peroxide can also be decomposed under the catalytic action of nano-titanium dioxide, enhancing the free radical generation rate, thereby improving the antibacterial and formaldehyde degradation abilities.

[0030] Micron-sized diatomaceous earth has a rich pore structure and a large specific surface area, which can uniformly load nano-sized calcium peroxide and nano-sized titanium dioxide, prevent their agglomeration, and improve the stability and activity of the coating. Micron-sized diatomaceous earth can also efficiently adsorb air pollutants such as formaldehyde and VOC (volatile organic compounds) in the air, enriching them on the coating surface and providing a higher reaction efficiency for the decomposition of air pollutants by nano-sized titanium dioxide. Nano-sized titanium dioxide (TiO2) oxidizes and decomposes the adsorbed formaldehyde (HCHO) into carbon dioxide (CO2) and water (H2O) under photocatalysis, achieving the harmless treatment of formaldehyde and thus improving the indoor air quality. Micron-sized diatomaceous earth can also improve the porosity and breathability of the coating, enhancing the durability and mechanical properties of the coating.

[0031] Based on 1 part by mass of micron-sized diatomaceous earth loaded with nano-sized calcium peroxide and nano-sized titanium dioxide, the formulation raw materials of the formaldehyde-removing and antibacterial coating provided by the present invention include 5 to 30 parts by mass of a thermosetting resin, specifically 10 to 30 parts in specific embodiments. As an implementation manner, the thermosetting resin is acrylic resin and / or amino resin, specifically acrylic resin or amino resin in specific embodiments.

[0032] The thermosetting resin (Crosslinking Resin) can form a three-dimensional network structure through chemical reactions or physical crosslinking in the coating, thereby enhancing the hardness, wear resistance, and scratch resistance of the coating. Coatings containing thermosetting resins are suitable for coatings that require high-strength protection, such as automotive coatings, industrial protective coatings, and furniture paints, and can resist the erosion of water, acids, alkalis, oils, and solvents, and are suitable for anti-corrosion coatings and chemical-resistant coatings, and are more stable in high-temperature environments, and are suitable for high-temperature-resistant coatings and outdoor weather-resistant coatings.

[0033] Based on 1 part by mass of micron-sized diatomaceous earth loaded with nano-sized calcium peroxide and nano-sized titanium dioxide, the formulation raw materials of the formaldehyde-removing and antibacterial coating provided by the present invention include 10 to 15 parts by mass of a curing agent, specifically 12 to 14 parts in specific embodiments. As an implementation manner, the curing agent is an amine curing agent; the amine curing agent includes an unmodified amine curing agent and / or a modified amine curing agent; the unmodified amine curing agent is a fatty amine curing agent and / or an aromatic amine curing agent, specifically a fatty amine curing agent in specific embodiments.

[0034] Based on 1 part by mass of micron diatomaceous earth loaded with nano calcium peroxide and nano titanium dioxide, the raw materials for preparing the formaldehyde-removing and antibacterial coating provided by the present invention include 1 to 3 parts by mass of a dispersant, specifically 1 to 2 parts in specific embodiments. As an implementation manner, the dispersant is one or more of a polycarboxylic acid type dispersant, a polyether-modified type dispersant, and a fluorinated acrylate block copolymer, specifically a polycarboxylic acid type dispersant in specific embodiments; the polycarboxylic acid type dispersant is a polycarboxylic acid polymer-based polymer dispersant, specifically the German BYK DISPERBYK-2012 water-based wetting dispersant in specific embodiments; the polyether-modified type dispersant is a polyether-modified polysiloxane surfactant, specifically TEGO Wet 270 in specific embodiments; the fluorinated acrylate block copolymer is a fluorine-containing block type acrylate copolymer surface aid, specifically the DuPont Capstone FS-30 fluorosurfactant in specific embodiments.

[0035] The dispersant can prevent particle agglomeration in the coating, improve the stability of the coating, enhance the particle dispersibility, reduce the viscosity of the coating system, improve its construction performance, and enhance the durability and anti-settling performance of the coating.

[0036] Based on 1 part by mass of micron diatomaceous earth loaded with nano calcium peroxide and nano titanium dioxide, the raw materials for preparing the formaldehyde-removing and antibacterial coating provided by the present invention include 1 to 5 parts by mass of a leveling agent, specifically 1 to 4 parts in specific embodiments. As an implementation manner, the leveling agent is BYK 306 wetting agent.

[0037] The leveling agent can improve the fluidity and uniformity of the coating, reduce surface defects, improve the coating uniformity, enhance the wettability, improve the adhesion, and enhance the final coating surface quality.

[0038] Based on 1 part by mass of micron diatomaceous earth loaded with nano calcium peroxide and nano titanium dioxide, the raw materials for preparing the formaldehyde-removing and antibacterial coating provided by the present invention include 25 to 50 parts by mass of an organic solvent, specifically 25 to 45 parts in specific embodiments. As an implementation manner, the organic solvent includes a polar organic solvent and / or a non-polar organic solvent; the polar organic solvent is butyl acetate and / or acetone, specifically acetone in specific embodiments; the non-polar organic solvent is xylene.

[0039] The present invention also provides a method for preparing the formaldehyde-removing and antibacterial coating according to the above technical solution, including the following steps:

[0040] Mix micron diatomaceous earth, nano calcium peroxide, and nano titanium dioxide for loading to obtain micron diatomaceous earth loaded with nano calcium peroxide and nano titanium dioxide;

[0041] Mix the micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, thermosetting resin, curing agent, dispersant, leveling agent and organic solvent to obtain the formaldehyde-removing antibacterial coating.

[0042] In the present invention, micron diatomite, nano calcium peroxide and nano titanium dioxide are mixed for loading to obtain micron diatomite loaded with nano calcium peroxide and nano titanium dioxide.

[0043] As an implementation method, the loading method is ultrasonic treatment or stirring, and ultrasonic treatment is used in specific embodiments.

[0044] As an implementation method, the power of the ultrasonic treatment is 100 - 1000 W, 200 - 500 W in specific embodiments, the temperature is 20 - 50 °C, 25 - 30 °C in specific embodiments, and the time is 5 - 30 min, 10 - 30 min in specific embodiments. The present invention uses the ultrasonic treatment temperature within the above range to avoid material degradation or calcium peroxide decomposition caused by too high temperature.

[0045] As an implementation method, the stirring is magnetic stirring or mechanical stirring; the rotation speed of the magnetic stirring is 300 - 1200 rpm, 500 - 1000 rpm in specific embodiments; the rotation speed of the mechanical stirring is 500 - 3000 rpm, 1000 - 2000 rpm in specific embodiments; the temperature of the stirring is 25 - 80 °C, 30 - 40 °C in specific embodiments; the time of the stirring is 30 - 60 min, 30 - 40 min in specific embodiments.

[0046] After obtaining the micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, the present invention mixes the micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, thermosetting resin, curing agent, dispersant, leveling agent and organic solvent to obtain the formaldehyde-removing antibacterial coating.

[0047] As an implementation method, mixing the micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, thermosetting resin, curing agent, dispersant, leveling agent and organic solvent is as follows: first, the micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, thermosetting resin, curing agent, dispersant and leveling agent are subjected to the first mixing, and then the organic solvent is added for the second mixing.

[0048] As an embodiment, the temperatures of the first mixing and the second mixing are independently 25 to 40°C, specifically 25 to 30°C in specific embodiments; the times of the first mixing and the second mixing are independently 20 to 30 min, specifically 30 min in specific embodiments; the first mixing and the second mixing are carried out under stirring conditions; the stirring is magnetic stirring or mechanical stirring; the rotation speed of the magnetic stirring is 500 to 1000 rpm, specifically 600 to 800 rpm in specific embodiments; the rotation speed of the mechanical stirring is 500 to 1000 rpm, specifically 600 to 800 rpm in specific embodiments.

[0049] In the present invention, nano-calcium peroxide with antibacterial properties and nano-titanium dioxide are co-loaded in micron-sized diatomite to form a coating with antibacterial properties and formaldehyde adsorption and decomposition properties. Nano-calcium peroxide and nano-titanium dioxide act synergistically by generating active free radicals, hydrogen peroxide and other substances to achieve excellent antibacterial properties; diatomite, as a loading material, effectively improves the stability and dispersibility of nano-particles, avoids the agglomeration of particles, thus ensuring the long-term functionality of the coating. Moreover, after formaldehyde is adsorbed by diatomite, it is decomposed by the photocatalytic action of titanium dioxide. The synergistic effect of calcium peroxide and titanium dioxide not only improves the antibacterial effect, but also enhances the formaldehyde decomposition ability, so that it has long-term antibacterial and formaldehyde removal capabilities. The coating not only has antibacterial and formaldehyde removal functions, but also can effectively reduce the harm of other volatile organic compounds (VOCs), can effectively purify indoor air, helps to improve indoor air quality, avoids the harm of formaldehyde to the human body, provides a healthier living environment, and has broad application prospects in indoor air purification and antibacterial coatings.

[0050] The present invention provides the application of the formaldehyde-removing and antibacterial coating described in the above technical solution or the formaldehyde-removing and antibacterial coating prepared by the preparation method described in the above technical solution in indoor decoration.

[0051] As an embodiment, the application is as follows: the formaldehyde-removing and antibacterial coating is coated on the surface of the substrate and cured; the coating is carried out by scraping, spraying or brushing, specifically spraying in specific embodiments; the thickness of the coating is 10 to 50 μm, specifically 20 to 40 μm in specific embodiments; the curing is thermal curing; the temperature of the thermal curing is 60 to 100°C, specifically 70 to 80°C in specific embodiments; the time of the thermal curing is 20 to 30 min, specifically 30 min in specific embodiments. The present invention has no special limitation on the substrate, and a substrate well-known in the art can be used.

[0052] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention, but they cannot be understood as a limitation to the protection scope of the present invention.

[0053] Example 1

[0054] The formaldehyde-removing and antibacterial coating is formulated according to the following mass fractions: 73 parts of micron-sized diatomaceous earth loaded with nano-calcium peroxide and nano-titanium dioxide (including 60 parts of micron-sized diatomaceous earth, 8 parts of nano-calcium peroxide, and 5 parts of nano-titanium dioxide), 30 parts of thermosetting resin, 12 parts of curing agent, 2 parts of dispersant, 1 part of leveling agent, and 25 parts of organic solvent;

[0055] Among them, the particle size of the micron-sized diatomaceous earth is 2 μm, the specific surface area is 200 m 2 / g, the porosity is 95%, the pore diameter is 50 nm, the particle size of the nano-calcium peroxide is 200 nm, the specific surface area is 80 m 2 / g, the particle size of the nano-titanium dioxide is 20 nm, and the specific surface area is 200 m 2 / g. The thermosetting resin is amino resin, the curing agent is aliphatic amine curing agent, the dispersant is German BYK DISPERBYK-2012 water-based wetting dispersant, the leveling agent is BYK byk306 wetting agent, and the organic solvent is acetone;

[0056] The specific preparation process is as follows:

[0057] Mix the micron-sized diatomaceous earth, nano-calcium peroxide and nano-titanium dioxide for loading, and perform ultrasonic treatment at 25 °C with 500 W for 30 min to obtain the micron-sized diatomaceous earth loaded with nano-calcium peroxide and nano-titanium dioxide;

[0058] First, mix the micron-sized diatomaceous earth loaded with nano-calcium peroxide and nano-titanium dioxide, thermosetting resin, curing agent, dispersant and leveling agent for the first time, perform magnetic stirring at 25 °C with 800 rpm for 30 min, then add the organic solvent for the second mixing, and perform magnetic stirring at 25 °C with 800 rpm for 30 min to obtain the formaldehyde-removing and antibacterial coating.

[0059] Example 2

[0060] The difference from Example 1 is that there are 55 parts of micron-sized diatomaceous earth, 10 parts of nano-calcium peroxide, and 7 parts of nano-titanium dioxide, and the rest is the same as Example 1.

[0061] Example 3

[0062] The difference from Example 1 is that acrylic resin is used to replace amino resin, and the rest is the same as Example 1.

[0063] Comparative Example 1

[0064] The difference from Example 1 is that the micron-sized diatomaceous earth is removed, and the rest is the same as Example 1.

[0065] Comparative Example 2

[0066] The difference from Example 1 is that nano-calcium peroxide is removed, and the rest is the same as Example 1.

[0067] Comparative Example 3

[0068] The difference from Example 1 is that nano-titanium dioxide is removed, and the rest is the same as Example 1.

[0069] Comparative Example 4

[0070] The difference from Example 1 is that micro-diatomite and nano-titanium dioxide are removed, and the rest is the same as Example 1.

[0071] Comparative Example 5

[0072] The difference from Example 1 is that micro-diatomite and nano-calcium peroxide are removed, and the rest is the same as Example 1.

[0073] Application Example 1

[0074] The formaldehyde-removing and antibacterial coating prepared in Example 1 was sprayed on the surface of the substrate with a spraying thickness of 40 μm and thermally cured at 80 °C for 30 min to obtain a formaldehyde-removing and antibacterial coating.

[0075] Application Examples 2 - 3

[0076] The difference from Application Example 1 is that the formaldehyde-removing and antibacterial coatings prepared in Example 1 were respectively replaced with the formaldehyde-removing and antibacterial coatings prepared in Example 2 and Example 3, and the rest is the same as Application Example 1.

[0077] Comparative Application Examples 1 - 5

[0078] The difference from Application Example 1 is that the formaldehyde-removing and antibacterial coatings prepared in Example 1 were respectively replaced with the coatings prepared in Comparative Examples 1 - 5, and the rest is the same as Application Example 1.

[0079] Performance Test

[0080] (1) The measurement of formaldehyde in the air was carried out by the activated carbon adsorption method.

[0081] After testing, the results showed that the coating prepared in Example 1 had significant antibacterial properties, and the adsorption effect on formaldehyde reached the standards of "Indoor Air Quality Standard GB_T18883 - 2002" and ISO 16000 - 3:2011 for indoor air.

[0082] The test results showed that the coating prepared in Example 2 had stronger formaldehyde adsorption ability, and at the same time, the antibacterial properties and the adhesion of the coating were both improved.

[0083] The results showed that the coating using acrylic resin in Example 3 had better gloss and weather resistance, and at the same time, it also showed excellent performance in antibacterial effect and formaldehyde removal effect.

[0084] Although the above embodiments have described the present invention in detail, they are only some of the embodiments of the present invention rather than all of them. People can also obtain other embodiments based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A formaldehyde-removing and antibacterial coating, characterized in that, It is prepared immediately before use and comprises the following raw materials in parts by mass: 60-95 parts of micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, 5-30 parts of thermosetting resin, 10-15 parts of curing agent, 1-3 parts of dispersant, 1-5 parts of leveling agent and 25-50 parts of organic solvent; In the micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, the mass ratio of micron diatomite, nano calcium peroxide and nano titanium dioxide is (50-70):(5-15):(5-10); The organic solvent includes polar organic solvent and / or non-polar organic solvent.

2. The formaldehyde-removing and antibacterial coating according to claim 1, wherein The specific surface area of the micron diatomite is 50 to 200 m 2 / g.

3. The formaldehyde-removing and antibacterial coating according to claim 1, characterized in that, The dispersant is one or more of polycarboxylic acid type dispersant, polyether modified type dispersant and fluorinated acrylate block copolymer.

4. The formaldehyde-removing antibacterial coating according to claim 1, characterized in that, The thermosetting resin is acrylic resin and / or amino resin.

5. The formaldehyde-removing and antibacterial coating according to claim 1, wherein The curing agent is an amine curing agent; the amine curing agent includes unmodified amine curing agent and / or modified amine curing agent; the unmodified amine curing agent is aliphatic amine curing agent and / or aromatic amine curing agent.

6. The formaldehyde-removing and antibacterial coating according to claim 1, wherein The polar organic solvent is butyl acetate and / or acetone; the non-polar organic solvent is xylene.

7. The preparation method of the formaldehyde-removing and antibacterial coating according to any one of claims 1 to 6, characterized in that, It includes the following steps: Mix micron diatomite, nano calcium peroxide and nano titanium dioxide for loading to obtain micron diatomite loaded with nano calcium peroxide and nano titanium dioxide; Mix the micron diatomite loaded with nano calcium peroxide and nano titanium dioxide, thermosetting resin, curing agent, dispersant, leveling agent and organic solvent to obtain the formaldehyde-removing antibacterial coating.

8. The preparation method according to claim 7, characterized in that, The loading method is ultrasonic treatment or stirring.

9. The preparation method according to claim 8, characterized in that, The power of the ultrasonic treatment is 100-1000W, the temperature is 20-50°C, and the time is 5-30min; The stirring is magnetic stirring or mechanical stirring; the rotation speed of the magnetic stirring is 300-1200rpm; the rotation speed of the mechanical stirring is 500-3000rpm; the temperature of the stirring is 25-80°C; the time of the stirring is 30-60min.

10. Application of the formaldehyde-removing antibacterial coating according to any one of claims 1-6 or the formaldehyde-removing antibacterial coating prepared by the preparation method according to any one of claims 7-9 in interior decoration.