Matt 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 matte antibacterial coating as well as a preparation method and application thereof. The matt antibacterial coating is prepared from the following raw materials in parts by mass: 35-65 parts of a nano calcium peroxide loaded micron porous inorganic material, 30-50 parts of epoxy resin, 15-25 parts of a curing agent, 2-5 parts of a dispersing agent, 1-2 parts of a flatting agent and 20-25 parts of an organic solvent, the mass ratio of the micron porous inorganic material to the nano calcium peroxide in the micron porous inorganic material loaded with the nano calcium peroxide is (30-50): (5-15); the micron porous inorganic material is halloysite and / or attapulgite. The matt antibacterial coating provided by the invention not only has remarkable long-acting antibacterial performance, effectively inhibits the breeding of bacteria and molds, but also can realize an excellent matt effect, and meets the requirements of indoor decoration and medical facilities on functional coatings.

Description

Technical Field

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

[0002] With the continuous growth of the demand in the functional coating market, antibacterial coatings have become an important type of coating. Especially in interior decoration and medical facilities, the antibacterial performance and matte effect of coatings have received extensive attention. Currently, the antibacterial effect of the matte antibacterial coatings on the market has a shelf life, generally 12 months. After this period, the bactericidal effect becomes less obvious. Moreover, when the antibacterial effect of the antibacterial coating fails, the durability of the coating may decrease, which also means that the coating surface is more vulnerable to the influence of the external environment, such as bacteria, ultraviolet rays, chemical corrosion, etc., thus having a negative impact on the matte effect of the coating. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a matte antibacterial coating, a preparation method thereof, and an application thereof, and the coating has excellent long-term antibacterial properties and a matte effect.

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

[0005] The present invention provides a matte antibacterial coating, comprising the following raw materials for preparation in parts by mass:

[0006] 35 - 65 parts of a micron-porous inorganic material loaded with nano-calcium peroxide, 30 - 50 parts of epoxy resin, 15 - 25 parts of curing agent, 2 - 5 parts of dispersant, 1 - 2 parts of leveling agent, and 20 - 25 parts of organic solvent;

[0007] In the micron-porous inorganic material loaded with nano-calcium peroxide, the mass ratio of the micron-porous inorganic material to nano-calcium peroxide is (30 - 50):(5 - 15);

[0008] The micron-porous inorganic material is halloysite and / or attapulgite.

[0009] Preferably, the particle size of the micron-porous inorganic material is 0.1 - 5 μm, and the specific surface area is 50 - 200 m 2 / g; the particle size of the nano-calcium peroxide is 10 - 500 nm.

[0010] Preferably, the epoxy resin is bisphenol A epoxy resin; the weight-average molecular weight of the bisphenol A epoxy resin is 300 - 1000 g / mol.

[0011] Preferably, the curing agent is polyamide curing agent and / or polyol curing agent.

[0012] Preferably, the dispersant is a polyether dispersant.

[0013] Preferably, the leveling agent is a polyether-modified polydimethylsiloxane wetting and leveling agent.

[0014] Preferably, the organic solvent includes one or more of xylene, butyl acetate, and ethylene glycol monobutyl ether.

[0015] The present invention also provides a method for preparing the matte antibacterial coating according to the above technical solution, comprising the following steps:

[0016] Mix the micron-porous inorganic material with nano-calcium peroxide for loading to obtain a micron-porous inorganic material loaded with nano-calcium peroxide;

[0017] After mixing the micron-porous inorganic material loaded with nano-calcium peroxide with epoxy resin, curing agent, dispersant, leveling agent, and organic solvent, perform degassing treatment to obtain the matte antibacterial coating.

[0018] Preferably, the loading includes a physical method or a chemical method; the physical method includes ultrasonic dispersion or stirring; the chemical method is to mix the micron-porous inorganic material, nano-calcium peroxide, and silane coupling agent for hydrolysis and condensation reaction;

[0019] The temperature of the ultrasonic dispersion is 25-50 °C, the power is 100-500 W, and the time is 10-30 min;

[0020] The temperature of the stirring is 30-60 °C, the rotation speed is 500-2000 rpm, and the time is 20-60 min;

[0021] The temperature of the hydrolysis and condensation reaction is 40-80 °C, and the time is 1-12 h.

[0022] The present invention also provides the application of the matte antibacterial coating according to the above technical solution or the matte antibacterial coating prepared by the above technical solution preparation method in interior decoration and / or medical facilities.

[0023] The present invention provides a matte antibacterial coating, which comprises the following raw materials for preparation in parts by mass: 35-65 parts of a micron-porous inorganic material loaded with nano-calcium peroxide, 30-50 parts of an epoxy resin, 15-25 parts of a curing agent, 2-5 parts of a dispersant, 1-2 parts of a leveling agent, and 20-25 parts of an organic solvent; the mass ratio of the micron-porous inorganic material to nano-calcium peroxide in the micron-porous inorganic material loaded with nano-calcium peroxide is (30-50):(5-15); the micron-porous inorganic material is halloysite and / or attapulgite. The present invention uses a micron-porous inorganic material with porous adsorption properties as a filler, which can not only improve the matting effect of the coating and maintain the matte state of the coating, but also serve as a carrier for loading nanoparticles, enabling nano-calcium peroxide to be stably loaded on its surface and inside the pores, avoiding premature release or failure of calcium peroxide, facilitating the subsequent slow release of the antibacterial component active oxygen, so that the matte antibacterial coating not only has significant long-term antibacterial properties and can effectively inhibit the growth of bacteria and molds, but also can achieve excellent matte effects, meeting the requirements of interior decoration and medical facilities for functional coatings. Detailed Embodiments

[0024] The present invention provides a matte antibacterial coating, which comprises the following raw materials for preparation in parts by mass:

[0025] 35-65 parts of a micron-porous inorganic material loaded with nano-calcium peroxide, 30-50 parts of an epoxy resin, 15-25 parts of a curing agent, 2-5 parts of a dispersant, 1-2 parts of a leveling agent, and 20-25 parts of an organic solvent;

[0026] the mass ratio of the micron-porous inorganic material to nano-calcium peroxide in the micron-porous inorganic material loaded with nano-calcium peroxide is (30-50):(5-15);

[0027] the micron-porous inorganic material is halloysite and / or attapulgite.

[0028] 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.

[0029] The raw materials for preparing the matte antibacterial coating provided by the present invention include 35 to 65 parts by mass of a micron-porous inorganic material loaded with nano-calcium peroxide, specifically 40 to 60 parts in specific embodiments. As an implementation manner, the mass ratio of the micron-porous inorganic material to nano-calcium peroxide in the micron-porous inorganic material loaded with nano-calcium peroxide is (30 to 50):(5 to 15), specifically (40 to 50):(5 to 12) in specific embodiments; the micron-porous inorganic material is halloysite and / or attapulgite, specifically halloysite or attapulgite in specific embodiments; the particle size of the micron-porous inorganic material is 0.1 to 5 μm, specifically 0.2 to 2 μm in specific embodiments, and the specific surface area is 50 to 200 m 2 / g, specifically 50 to 100 m 2 / g, the porosity is 60 to 90%, specifically 60 to 80% in specific embodiments; the particle size of the nano-calcium peroxide is 10 to 500 nm, specifically 50 to 200 nm in specific embodiments.

[0030] In the present invention, the micron-porous inorganic material loaded with nano-calcium peroxide, that is, nano-calcium peroxide, is loaded on the surface and inside the pores of the micron-porous inorganic material through electrostatic adsorption.

[0031] Halloysite is natural nano-tubular kaolin, and attapulgite is a hydrated magnesium-rich silicate clay mineral with a chain-layered structure. The micron-porous inorganic material has a large specific surface area and a cavity structure, enabling it to have porous adsorption properties. It also has rich hydroxyl functional groups (Si-OH, Al-OH), which can effectively adsorb nano-calcium peroxide. In the present invention, the micron-porous inorganic material is used as a matting agent, which can form a matte effect, reduce light reflection, and can also be used as a nano-carrier to load nano-calcium peroxide, improving the stability and slow-release ability of the antibacterial agent. In addition, the micron-porous inorganic material can also enhance the coating performance, improving the wear resistance, adhesion and weather resistance of the coating.

[0032] In the present invention, nano-calcium peroxide (CaO2) has a long-term antibacterial effect. In the coating, nano-calcium peroxide can release reactive oxygen species (H2O2, ·OH) to kill bacteria, molds and viruses. Its antibacterial performance has a slow-release mechanism, which can continuously provide antibacterial effects and improve the persistence of antibacterial effects. Moreover, nano-calcium peroxide is non-toxic and environmentally friendly, and is suitable for indoor environmental protection coatings.

[0033] Based on 1 part by mass of the micron-porous inorganic material loaded with nano-calcium peroxide, the raw materials for preparing the matte antibacterial coating provided by the present invention include 30 to 50 parts by mass of epoxy resin, specifically 30 to 40 parts in specific embodiments. As an implementation manner, the epoxy resin is bisphenol A epoxy resin; the weight average molecular weight of the bisphenol A epoxy resin is 300 to 1000 g / mol, specifically 400 to 800 g / mol in specific embodiments; the bisphenol A epoxy resin includes one or several of liquid bisphenol A epoxy resin, solid bisphenol A epoxy resin, waterborne bisphenol A epoxy resin, and modified bisphenol A epoxy resin, specifically liquid bisphenol A epoxy resin in specific embodiments. The present invention has no special limitation on the manufacturer and model of the bisphenol A epoxy resin, and the bisphenol A epoxy resin of well-known manufacturers and models in the art can be used.

[0034] Epoxy Resin is a thermosetting resin. Epoxy resin has polar functional groups (-OH, -NH2, -COOH), can form strong bonds with various substrates (such as metals, concrete, plastics), and improve adhesion. After crosslinking and curing, epoxy resin forms a dense network structure, which can effectively resist the erosion of acids, alkalis, solvents, and salt spray, and is suitable for anti-corrosion coatings and industrial coatings. The cured epoxy resin has high hardness, impact resistance, and scratch resistance, and is suitable for floor paints and wear-resistant coatings. The crosslinked and cured epoxy resin forms a low-permeability coating, which can prevent the penetration of water and improve the waterproof performance of the coating.

[0035] Based on 1 part by mass of the micron-porous inorganic material loaded with nano-calcium peroxide, the raw materials for preparing the matte antibacterial coating provided by the present invention include 15 to 25 parts by mass of curing agent, specifically 15 to 20 parts in specific embodiments. As an implementation manner, the curing agent is polyamide curing agent and / or polyol curing agent, specifically polyamide curing agent in specific embodiments.

[0036] Curing Agent can promote the crosslinking and curing of epoxy resin in the coating.

[0037] Based on 1 part by mass of the micron-porous inorganic material loaded with nano-calcium peroxide, the raw materials for preparing the matte antibacterial coating provided by the present invention include 2 to 5 parts by mass of dispersant, specifically 2 to 4 parts in specific embodiments. As an implementation manner, the dispersant is polyether dispersant. The present invention has no special limitation on the model and manufacturer of the polyether dispersant, and the polyether dispersant of well-known models and manufacturers in the art can be used.

[0038] Dispersant can prevent the agglomeration of fillers and nano materials in the coating and improve the dispersibility. The dispersant can form a protective layer on the particle surface, reduce the interaction force between particles, and make them evenly distributed. Prevent flocculation, ensure the uniform distribution of particles, and improve the stability of the coating.

[0039] Based on 1 part by mass of the micro-porous inorganic material loaded with nano-calcium peroxide, the raw materials for preparing the matte antibacterial coating provided by the present invention include 1-2 parts by mass of a leveling agent, specifically 1-1.5 parts in specific embodiments. As an implementation manner, the leveling agent is a polyether-modified polydimethylsiloxane type wetting and leveling agent. The present invention has no special limitation on the model and manufacturer of the polyether-modified polydimethylsiloxane type wetting and leveling agent, and a polyether-modified polydimethylsiloxane type wetting and leveling agent well-known in the art can be used.

[0040] The leveling agent is mainly used to improve the fluidity and uniformity of the coating film, prevent construction defects, and improve the final coating quality. The leveling agent can reduce surface defects, improve smoothness, prevent orange peel phenomenon, improve the flatness and gloss of the coating, and avoid problems such as brush marks, shrinkage holes, sagging, and fisheyes. The leveling agent can also enhance wettability, improve coating uniformity, enhance the self-leveling property of the coating, make the coating film spread evenly, and improve construction performance. The leveling agent can also improve the transparency and gloss of the coating, and is suitable for high-gloss coatings, metallic paints, and automotive paints to prevent the coating film from turning white or having a hazy shadow. The leveling agent adjusts the rheology of the coating to reduce pinhole defects caused by the rupture of air bubbles during construction.

[0041] Based on 1 part by mass of the micro-porous inorganic material loaded with nano-calcium peroxide, the raw materials for preparing the matte antibacterial coating provided by the present invention include 20-25 parts by mass of an organic solvent, specifically 20-23 parts in specific embodiments. As an implementation manner, the organic solvent includes one or more of xylene, butyl acetate, and ethylene glycol monobutyl ether, specifically xylene or butyl acetate in specific embodiments.

[0042] In the present invention, the organic solvent can dissolve and disperse raw materials such as epoxy resin, control the film-forming process, improve the coating quality, and adjust the volatility and environmental friendliness of the coating.

[0043] By fully combining nano-calcium peroxide with the micro-porous inorganic material, the present invention maximally ensures that nano-calcium peroxide can be stably loaded on the surface and inside the pores of the micro-porous inorganic material, avoiding the premature release or failure of calcium peroxide. The micro-porous inorganic material not only acts as a filler but also serves as a carrier for loading nano-particles, significantly enhancing the matting effect and antibacterial performance of the coating. In addition, other additives such as dispersants, leveling agents, and curing agents are used to further improve the stability and service performance of the coating. The matte antibacterial coating provided by the present invention not only has significant antibacterial performance and can effectively inhibit the growth of bacteria and molds, but also can achieve excellent matte effects, meeting the requirements of interior decoration and medical facilities for functional coatings.

[0044] The present invention also provides a method for preparing the matte antibacterial coating described in the above technical solution, comprising the following steps:

[0045] Mix a micron-porous inorganic material with nano-calcium peroxide for loading to obtain a micron-porous inorganic material loaded with nano-calcium peroxide;

[0046] After mixing the micron-porous inorganic material loaded with nano-calcium peroxide with an epoxy resin, a curing agent, a dispersant, a leveling agent, and an organic solvent, perform a degassing treatment to obtain the matte antibacterial coating.

[0047] The present invention mixes a micron-porous inorganic material with nano-calcium peroxide for loading to obtain a micron-porous inorganic material loaded with nano-calcium peroxide.

[0048] As an embodiment, the loading includes a physical method or a chemical method; the physical method includes ultrasonic dispersion or stirring, specifically ultrasonic dispersion in a specific embodiment; the chemical method is to mix the micron-porous inorganic material, nano-calcium peroxide, and a silane coupling agent for a hydrolysis and condensation reaction.

[0049] As an embodiment, the temperature of the ultrasonic dispersion is 25-50 °C, specifically 30-40 °C in a specific embodiment, the power is 100-500 W, specifically 200-400 W in a specific embodiment, and the time is 10-30 min, specifically 10-20 min in a specific embodiment. Ultrasonic dispersion enhances the electrostatic adsorption of the micron-porous inorganic material to nano-calcium peroxide by destroying the agglomeration of nano-calcium peroxide and improving the dispersibility, so that it is evenly distributed on the surface and inside the pores.

[0050] As an embodiment, the stirring is mechanical stirring; the temperature of the stirring is 30-60 °C, specifically 30-40 °C in a specific embodiment, the rotation speed is 500-2000 rpm, specifically 500-1000 rpm in a specific embodiment, and the time is 20-60 min, specifically 20-30 min in a specific embodiment. During the stirring process, the high shear force and convection effect make nano-calcium peroxide evenly distributed on the surface of the micron-porous inorganic material, improve the binding force, and make nano-calcium peroxide evenly loaded on the surface and inside the pores of the micron-porous inorganic material through electrostatic adsorption.

[0051] As an embodiment, the silane coupling agent includes 3-aminopropyltriethoxysilane and / or 3-glycidoxypropyltrimethoxysilane, specifically 3-aminopropyltriethoxysilane in a specific embodiment; the mass of the silane coupling agent is 1-3% of the total mass of the micron-porous inorganic material and nano-calcium peroxide, specifically 1-2% in a specific embodiment; the temperature of the hydrolysis and condensation reaction is 40-80 °C, specifically 50-70 °C in a specific embodiment, and the time is 1-12 h, specifically 3-10 h in a specific embodiment.

[0052] After obtaining the micro-porous inorganic material loaded with nano-calcium peroxide, the present invention mixes the micro-porous inorganic material loaded with nano-calcium peroxide with epoxy resin, curing agent, dispersant, leveling agent and organic solvent, and then performs degassing treatment to obtain the matte antibacterial coating.

[0053] As an embodiment, mixing the micro-porous inorganic material loaded with nano-calcium peroxide with epoxy resin, curing agent, dispersant, leveling agent and organic solvent is carried out as follows: firstly, the micro-porous inorganic material loaded with nano-calcium peroxide and epoxy resin are mixed for the first time, then a dispersant is added for the second mixing, a leveling agent and an organic solvent are added for the third mixing, and finally a curing agent is added for the fourth mixing.

[0054] As an embodiment, the temperature of the first mixing is 30 - 80 °C, specifically 30 - 40 °C in specific examples, and the time is 10 - 120 min, specifically 15 - 60 min in specific examples; the first mixing is carried out under stirring; the rotation speed of the stirring is 300 - 2000 rpm, specifically 500 - 1000 rpm in specific examples.

[0055] As an embodiment, the temperature of the second mixing is 30 - 80 °C, specifically 30 - 40 °C in specific examples, and the time is 10 - 20 min, specifically 10 - 15 min in specific examples; the second mixing is carried out under stirring; the rotation speed of the stirring is 300 - 2000 rpm, specifically 500 - 1000 rpm in specific examples.

[0056] As an embodiment, the temperature of the third mixing is 30 - 80 °C, specifically 30 - 40 °C in specific examples, and the time is 20 - 40 min, specifically 25 - 30 min in specific examples; the third mixing is carried out under stirring; the rotation speed of the stirring is 300 - 2000 rpm, specifically 500 - 1000 rpm in specific examples.

[0057] As an embodiment, the temperature of the fourth mixing is 30 - 80 °C, specifically 30 - 40 °C in specific examples, and the time is 20 - 40 min, specifically 25 - 30 min in specific examples; the fourth mixing is carried out under stirring; the rotation speed of the stirring is 300 - 2000 rpm, specifically 500 - 1000 rpm in specific examples.

[0058] As an embodiment, the degassing treatment includes vacuum degassing, static degassing, heating degassing or ultrasonic degassing, specifically static degassing in specific examples.

[0059] The present invention has no special limitation on the setting of the condition parameters for the vacuum degassing, static degassing, heating degassing, and ultrasonic degassing, and the degassing can be completed by using the condition parameters well-known in the art.

[0060] Degassing treatment can remove the air bubbles and solvent residues in the coating. Especially during the process of loading nano-calcium peroxide (CaO2) onto micro-porous inorganic materials (Halloysite), degassing can prevent the coating quality from being affected by air bubble inclusions and solvent residues.

[0061] The present invention also provides the application of the matte antibacterial coating described in the above technical solution or the matte antibacterial coating prepared by the preparation method described in the above technical solution in interior decoration and / or medical facilities.

[0062] As an implementation manner, the application method is as follows: the matte antibacterial coating is coated on the surface of the substrate and cured; the coating is one or more of spraying, dip coating, roll coating, and scraping, and is spraying in specific embodiments; the thickness of the coating is 10 - 50 μm, and is 20 - 40 μm in specific embodiments; the curing is thermal curing. The present invention has no special limitation on the temperature and time of the thermal curing, and can be adjusted according to the actual situation.

[0063] 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.

[0064] Example 1

[0065] The raw materials used for the matte antibacterial coating are formulated according to the following mass fractions: 50 parts of halloysite, 10 parts of nano-calcium peroxide, 30 parts of epoxy resin, 15 parts of curing agent, 2 parts of dispersant, 1 part of leveling agent, and 20 parts of organic solvent;

[0066] The particle size of the halloysite is 0.2 μm, the specific surface area is 100 m 2 / g, and the porosity is 80%; the particle size of the nano-calcium peroxide is 50 nm; the epoxy resin is a liquid bisphenol A epoxy resin with a weight average molecular weight of 800 g / mol; the curing agent is a polyamide curing agent; the dispersant is a polyether dispersant; the leveling agent is a polyether-modified polydimethylsiloxane type wetting and leveling agent; the organic solvent is xylene;

[0067] The preparation process is as follows: halloysite and nano-calcium peroxide are mixed for loading to obtain halloysite loaded with nano-calcium peroxide. The loading method is ultrasonic dispersion, the temperature is 30 °C, the power is 400 W, and the time is 10 min;

[0068] First, mix the halloysite loaded with nano-calcium peroxide and epoxy resin, stir at 1000 rpm for 30 min at 30°C, add a dispersant for a second mixing, stir at 1000 rpm for 10 min at 30°C, add a leveling agent and an organic solvent for a third mixing, stir at 1000 rpm for 30 min at 30°C, and finally add a curing agent for a fourth mixing, stir at 1000 rpm for 30 min at 30°C. Let the resulting mixed system stand for degassing to obtain the matte antibacterial coating.

[0069] Example 2

[0070] The difference from Example 1 is that there are 40 parts of halloysite and 12 parts of nano-calcium peroxide, and the rest is the same as in Example 1.

[0071] Example 3

[0072] The difference from Example 1 is that halloysite is replaced with attapulgite, and the rest is the same as in Example 1.

[0073] Comparative Example 1

[0074] The difference from Example 1 is that halloysite is removed, and the rest is the same as in Example 1.

[0075] Comparative Example 2

[0076] The difference from Example 1 is that nano-calcium peroxide is removed, and the rest is the same as in Example 1.

[0077] Comparative Example 3

[0078] The difference from Example 3 is that nano-calcium peroxide is removed, and the rest is the same as in Example 3.

[0079] Application Example 1

[0080] Spray the matte antibacterial coating prepared in Example 1 on the surface of the substrate with a spraying thickness of 40 μm, and perform thermal curing to obtain a matte antibacterial coating.

[0081] Application Example 2

[0082] The difference from Application Example 1 is that the matte antibacterial coating prepared in Example 1 is replaced with the matte antibacterial coating prepared in Example 2, and the rest is the same as in Application Example 1.

[0083] Application Example 3

[0084] The difference from Application Example 1 is that the matte antibacterial coating prepared in Example 1 is replaced with the matte antibacterial coating prepared in Example 3, and the rest is the same as in Application Example 1.

[0085] Comparative Application Example 1

[0086] The difference from Application Example 1 is that the matte antibacterial coating prepared in Example 1 is replaced with the coating prepared in Comparative Example 1, and the rest is the same as Application Example 1.

[0087] Comparative Application Example 2

[0088] The difference from Application Example 1 is that the matte antibacterial coating prepared in Example 1 is replaced with the coating prepared in Comparative Example 2, and the rest is the same as Application Example 1.

[0089] Comparative Application Example 3

[0090] The difference from Application Example 1 is that the matte antibacterial coating prepared in Example 1 is replaced with the coating prepared in Comparative Example 3, and the rest is the same as Application Example 1.

[0091] Performance Test

[0092] (1) The coating of Application Example 1 of the present invention has excellent antibacterial performance and matte effect, and the gloss of the coating surface reaches the required standard.

[0093] Compared with Application Example 1, the antibacterial performance and matte effect of the coating of Application Example 2 in the present invention are both improved, and there is a significant improvement especially in the antibacterial persistence.

[0094] Compared with Application Example 1, the coating using attapulgite ore as a carrier in Application Example 3 of the present invention can also achieve good antibacterial effect and has good surface gloss and mechanical strength.

[0095] Although the above embodiments have made a detailed description of the present invention, they are only a part of the embodiments of the present invention rather than all embodiments. People can also obtain other embodiments according to these embodiments without creative premise, and these embodiments all belong to the protection scope of the present invention.

Claims

1. A matte antibacterial coating, characterized in that, It comprises the following raw materials in parts by mass: 35 - 65 parts of micro-porous inorganic material loaded with nano-calcium peroxide, 30 - 50 parts of epoxy resin, 15 - 25 parts of curing agent, 2 - 5 parts of dispersant, 1 - 2 parts of leveling agent, and 20 - 25 parts of organic solvent; In the micro-porous inorganic material loaded with nano-calcium peroxide, the mass ratio of the micro-porous inorganic material to nano-calcium peroxide is (30 - 50):(5 - 15); The micro-porous inorganic material is halloysite and / or attapulgite.

2. The matte antibacterial coating according to claim 1, wherein The particle size of the micron-porous inorganic material is 0.1 to 5 μm, and the specific surface area is 50 to 200 m 2 / g; the particle size of the nano calcium peroxide is 10 to 500 nm.

3. The matte antibacterial coating according to claim 1, wherein The epoxy resin is bisphenol A epoxy resin; the weight-average molecular weight of the bisphenol A epoxy resin is 300 - 1000 g / mol.

4. The matte antibacterial coating according to claim 1, characterized in that, The curing agent is polyamide curing agent and / or polyol curing agent.

5. The matte antibacterial coating according to claim 1, characterized in that, The dispersant is polyether dispersant.

6. The matte antibacterial coating according to claim 1, wherein The leveling agent is polyether-modified polydimethylsiloxane type wetting and leveling agent.

7. The matte antibacterial coating according to claim 1, characterized in that, The organic solvent includes one or more of xylene, butyl acetate, and ethylene glycol monobutyl ether.

8. The preparation method of the matte antibacterial coating according to any one of claims 1 to 7, characterized in that, It comprises the following steps: Mix the micro-porous inorganic material with nano-calcium peroxide for loading to obtain the micro-porous inorganic material loaded with nano-calcium peroxide; After mixing the micro-porous inorganic material loaded with nano-calcium peroxide with epoxy resin, curing agent, dispersant, leveling agent, and organic solvent, perform degassing treatment to obtain the matte antibacterial coating.

9. The preparation method according to claim 8, wherein The loading includes physical method or chemical method; the physical method includes ultrasonic dispersion or stirring; the chemical method is to mix the micro-porous inorganic material, nano-calcium peroxide, and silane coupling agent for hydrolysis and condensation reaction; The temperature of the ultrasonic dispersion is 25 - 50 °C, the power is 100 - 500 W, and the time is 10 - 30 min; The temperature of the stirring is 30 - 60 °C, the rotation speed is 500 - 2000 rpm, and the time is 20 - 60 min; The temperature of the hydrolysis and condensation reaction is 40 - 80 °C, and the time is 1 - 12 h.

10. Application of the matte antibacterial coating according to any one of claims 1 - 7 or the matte antibacterial coating prepared by the preparation method according to claim 8 or 9 in interior decoration and / or medical facilities.