A synthetic diamond coating and a method of making the same

Abstract

This application relates to the field of interior wall decoration materials, specifically disclosing a crystal diamond coating and its preparation method. The base slurry of the crystal diamond coating comprises the following components: antibacterial emulsion; water; defoamer; ethylene glycol; film-forming aid; bentonite; suspending agent; cellulose; odor-neutralizing multifunctional additive; and thickener. The antibacterial emulsion is a bio-based styrene-acrylic emulsion with antibacterial groups. The crystal diamond coating obtained by this application has strong decorative properties and broad-spectrum antibacterial ability. Furthermore, the antibacterial components are not prone to migration, degradation, or discoloration within the coating, resulting in more durable antibacterial performance. Simultaneously, this crystal diamond coating also possesses excellent formaldehyde removal capabilities, capable of effectively and persistently adsorbing and decomposing indoor formaldehyde under normal temperature, pressure, and light conditions. It is environmentally friendly and can be widely used in various locations with high antibacterial and environmental protection requirements.

Description

Technical Field

[0001] This application relates to the field of interior wall decoration materials, and more specifically, to a crystal diamond coating and its preparation method. Background Technology

[0002] Latex paint is a type of water-based coating made by adding pigments, fillers, and various additives to synthetic resin emulsions. Also known as synthetic resin emulsion paint, it belongs to the category of organic coatings. Depending on the raw materials used, latex paint is mainly divided into polyvinyl acetate latex paint, ethylene-propylene latex paint, and pure acrylic latex paint. Due to its characteristics such as rapid film formation, short construction time, low construction cost, and excellent breathability, it is widely used for the decoration and protection of interior walls and ceilings.

[0003] However, traditional latex paint offers relatively limited color choices, has limited coverage, and is relatively weak at concealing wall imperfections. Furthermore, it lacks decorative appeal and texture, resulting in walls that appear flat and lack visual impact. To address these shortcomings, technicians began adding crystal diamonds (sand coated with metallic powders of various colors) to latex paint. These crystal diamonds create a variety of unique patterns and textures, giving walls a more three-dimensional and textured appearance.

[0004] Currently, latex paints containing diamond crystals typically possess certain water resistance, mildew resistance, and weather resistance. Furthermore, with the increasing demand for healthy, clean, and ecological living environments, these latex paints also need to possess antibacterial properties. Antibacterial properties can be achieved by incorporating antibacterial agents and other functional antibacterial materials into the latex paint, creating additive-type antibacterial coatings. This inhibits the growth and reproduction of bacteria on the coating surface. However, in additive-type antibacterial coatings, the antibacterial agent, as a functional additive distributed within the coating system, can undergo migration, degradation, and discoloration within the coating, leading to a significant reduction or even complete loss of antibacterial properties. Summary of the Invention

[0005] To address the aforementioned technical issues, this application provides a crystal diamond coating and its preparation method.

[0006] Firstly, the crystal diamond coating provided in this application adopts the following technical solution:

[0007] A crystal diamond coating comprises a base slurry and crystal diamonds in a weight ratio of (2-4):(4-6); wherein the raw materials used in the base slurry include the following components in parts by weight:

[0008] Antibacterial emulsion, 380-420 parts;

[0009] 500-550 parts water;

[0010] 1-5 parts of defoamer;

[0011] 3-8 parts ethylene glycol;

[0012] 18-22 parts of film-forming aid;

[0013] 3-4 parts bentonite;

[0014] 5-7 parts of suspension concentrate;

[0015] 2-6 parts cellulose;

[0016] 3-4 parts of deodorizing multifunctional additive;

[0017] Thickener 2-3 parts;

[0018] The antibacterial emulsion is a bio-based styrene-acrylic emulsion with antibacterial groups.

[0019] By adopting the above technical solution, this application uses a bio-based styrene-acrylic emulsion with antibacterial groups as the base emulsion for the crystal diamond coating, and mixes it with other components to form a highly decorative structural antibacterial coating. Since the bio-based styrene-acrylic emulsion with antibacterial groups is made through a chemical reaction, using chemical bonds to connect antibacterial groups to the polymer resin, compared to additive antibacterial coatings, the possibility of antibacterial components migrating, degrading, or discoloring in the structural antibacterial coating made with this antibacterial emulsion is greatly reduced, resulting in more durable antibacterial performance and fundamentally solving the problem of unstable antibacterial performance in additive antibacterial coatings. Furthermore, the antibacterial coating of this application also has good anti-graffiti ability, strong washability, is easy to wipe and clean, has extremely low VOC content, and is environmentally friendly.

[0020] Preferably, the antibacterial emulsion is prepared by the following method:

[0021] a. Dry the cationic oxidized starch at 80-85℃ for 2-2.5h to obtain dried cationic oxidized starch; under the conditions of 40-45℃ and 400-450r / min, mix 30-35 parts by weight of the dried cationic oxidized starch and 150-175 parts by weight of water and stir for 10-15min, then add 0.12-0.14 parts by weight of ferrous sulfate heptahydrate and 7.5-8.0 parts by weight of H2O2, then raise the temperature to 70-75℃, continue to add 3.25-3.75 parts by weight of H2O2, then raise the temperature to 88-90℃, add 2.4-3.4 parts by weight of methacryloyloxyethyl dimethyl benzyl ammonium chloride, and keep warm for 30-40min;

[0022] b. Cool the product obtained in step a to 80-82℃, add 22.5-26.3 parts by weight of butyl acrylate and 0.1-0.12 parts by weight of initiator, keep the reaction at this temperature for 30-40 min, then add 22.5-26.3 parts by weight of styrene and 0.1-0.12 parts by weight of initiator, keep the reaction at this temperature for 1.5-2.0 h, then cool and filter to obtain an antibacterial emulsion.

[0023] By adopting the above technical solution, this application uses cationic oxidized starch, styrene, and butyl acrylate as main raw materials to prepare a bio-based styrene-acrylic emulsion through a soap-free emulsion polymerization method. This bio-based styrene-acrylic emulsion is a positively charged emulsion that can interact with the negatively charged surface of microorganisms, thereby destroying the cell membrane and causing cell death, exhibiting good antibacterial properties and antibacterial stability. Simultaneously, this application introduces methacryloyloxyethyl dimethyl benzyl ammonium chloride into the copolymer chain of the bio-based styrene-acrylic emulsion. On the one hand, methacryloyloxyethyl dimethyl benzyl ammonium chloride can fully utilize its highly efficient bactericidal ability, improving the antibacterial properties of the bio-based styrene-acrylic emulsion. Furthermore, it possesses good stability and durability, is not easily volatilized or lost, and is long-lasting, maintaining its bactericidal effect in various environments for a long time. On the other hand, it can also fully utilize its synergistic effect with cationic oxidized starch, further enhancing the antibacterial properties of the bio-based styrene-acrylic emulsion.

[0024] Furthermore, compared to other quaternary ammonium salt antibacterial agents, such as dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, methacryloyloxyethyltrimethylammonium chloride, and hexadecyldimethylallylammonium chloride, the methacryloyloxyethyldimethylbenzylammonium chloride of this application can give the coating a broader spectrum of antibacterial ability. It can not only have good antibacterial ability against Staphylococcus aureus and Escherichia coli, but also have good antiviral activity against enterovirus EV71, etc., and has great application value.

[0025] Preferably, in step b, after adding butyl acrylate and the initiator, a natural antibacterial agent is added to the system, and the amount of the natural antibacterial agent added is 4-6 wt% of the total amount of butyl acrylate and styrene.

[0026] Preferably, the natural antibacterial agent includes one of licorice extract, tea polyphenol extract, nutmeg extract, and cinnamon oil extract.

[0027] Through the above technical solution, this application further introduces natural antibacterial agents with good antibacterial properties, such as licorice extract, tea polyphenol extract, nutmeg extract and cinnamon oil extract, into the copolymer chain of the bio-based styrene-acrylic emulsion. This allows the natural antibacterial agents and methacryloyloxyethyl dimethyl benzyl ammonium chloride to fully exert their synergistic antibacterial effect, thereby enhancing the bactericidal ability of the bio-based styrene-acrylic emulsion.

[0028] Preferably, the amount of the natural antibacterial agent added is 5-5.5 wt% of the total amount of butyl acrylate and styrene.

[0029] Through the above technical solution, this application further optimizes the dosage of natural antibacterial agents, which can further enhance the bactericidal ability of bio-based styrene-acrylic emulsion and further improve the stability of bio-based styrene-acrylic emulsion.

[0030] Preferably, the base slurry also includes 5-8 parts by weight of diatomaceous earth-loaded manganese dioxide.

[0031] Through the above technical solution, this application also adds diatomaceous earth-loaded manganese dioxide to the base slurry, and utilizes its synergistic effect with components such as bio-based styrene-acrylic emulsion and odor-neutralizing multifunctional additives to improve the formaldehyde removal ability of the crystal diamond coating under normal temperature, normal pressure and normal light, and can adsorb and decompose indoor formaldehyde for a long time and efficiently.

[0032] Preferably, the diatomaceous earth loaded with manganese dioxide is prepared by the following method:

[0033] Diatomaceous earth was immersed in a potassium permanganate solution with a concentration of 0.03-0.2 mol / L. Citric acid was added and the pH was adjusted to 5-6 with ammonia. The mixture was then ultrasonically vibrated for 2-2.5 h, dried to constant weight at 60-70℃, and calcined at 620-650℃ for 0.5-0.6 h. After cooling to room temperature, the mixture was stirred evenly and ultrasonically vibrated for 30-40 min to obtain diatomaceous earth loaded with manganese dioxide. The mass-to-volume ratio of diatomaceous earth to potassium permanganate solution was 0.2-0.25 g / mL, and the weight ratio of citric acid to diatomaceous earth was (0.8-1.0):1.

[0034] Through the above technical solution, the diatomaceous earth loaded with manganese dioxide prepared by potassium permanganate solution has a stronger adsorption and decomposition effect on formaldehyde than the diatomaceous earth loaded with manganese dioxide prepared by manganese dioxide powder, which further improves the formaldehyde removal ability of the crystal diamond coating under normal temperature, normal pressure and normal light.

[0035] Preferably, the concentration of the potassium permanganate solution is 0.06-0.1 mol / L.

[0036] Preferably, the concentration of the potassium permanganate solution is 0.08 mol / L.

[0037] Through the above technical solution, this application further optimizes the concentration of potassium permanganate solution, thereby further improving the adsorption and decomposition capacity of formaldehyde by diatomaceous earth-supported manganese dioxide. Experimental data demonstrates that when the concentration of potassium permanganate solution is 0.08 mol / L, the adsorption and decomposition capacity of formaldehyde by the prepared diatomaceous earth-supported manganese dioxide reaches its maximum level.

[0038] Secondly, the method for preparing a crystal diamond coating provided in this application adopts the following technical solution:

[0039] A method for preparing a crystal diamond coating includes the following steps:

[0040] S1. Preparation of base paint slurry: Mix and stir the raw materials for base paint slurry at a speed of 300-1300 r / min for 30-35 min to obtain base paint slurry;

[0041] S2. Preparation of Crystal Diamond Coating: Mix the base paint slurry and crystal diamond evenly to obtain crystal diamond coating.

[0042] In summary, this application has the following beneficial technical effects:

[0043] 1. The crystal diamond coating of this application has strong broad-spectrum antibacterial ability, and the antibacterial components are not prone to migration, degradation, discoloration or other changes in the coating, and the antibacterial performance is more durable;

[0044] 2. The crystal diamond coating of this application has good formaldehyde removal ability and can adsorb and decompose indoor formaldehyde for a long time and efficiently under normal temperature, normal pressure and normal light.

[0045] 3. The crystal diamond coating of this application has strong decorative properties and strong washability, is easy to wipe and clean, has extremely low VOC content, and is green and environmentally friendly. Detailed Implementation

[0046] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0047] Unless otherwise specified, all raw materials used in this application are commercially available products, specifically:

[0048] Crystal Diamond, purchased from Guangdong Shuangjiang New Environmentally Friendly Building Materials Technology Co., Ltd., can be selected in different colors according to production needs. It can be a single color or multiple colors mixed in a certain proportion.

[0049] Defoamer, purchased from Beijing Guzhengben Technology Co., Ltd., model number 1827;

[0050] Ethylene glycol, purchased from Shandong Enhe Energy Technology Co., Ltd., has a boiling point of 195-198℃;

[0051] Film-forming aid, purchased from Nanjing Qinghai Trading Co., Ltd., model is RHODIASOLV DIB (Odorless Film-forming Aid), boiling point is 273℃;

[0052] Bentonite, purchased from Zhejiang Hongyu Construction Co., Ltd., model EW-4;

[0053] Cellulose, purchased from Yunying, model BR100000H;

[0054] The suspending agent, model XY-500, was purchased from Nanjing Panhai Trading Co., Ltd.

[0055] Odor-neutralizing multi-functional additive, purchased from Wacker, model BS168;

[0056] Thickener, purchased from Wanhua Chemical, model A406;

[0057] Cationic oxidized starch was purchased from Guangxi State Farms Mingyang Biochemical Group Co., Ltd.

[0058] Ferrous sulfate heptahydrate was purchased from Gongyi Tenglong Water Treatment Materials Co., Ltd.

[0059] Butyl acrylate, purchased from Shandong Chuangying Chemical Co., Ltd.;

[0060] The initiator, composed of potassium persulfate, was purchased from Yunsheng Chemical (Shandong) Co., Ltd.

[0061] Styrene was purchased from Narme New Materials (Shandong) Group Co., Ltd.

[0062] Licorice extract, purchased from Xi'an Youshuo Biotechnology Co., Ltd., in powder form, with a mesh size of 80 mesh and a specification of 10:1;

[0063] Tea polyphenol extract, purchased from Hebei Tuohai Biotechnology Co., Ltd., in powder form, with a mesh size of 80 mesh, and an effective ingredient content of 99%;

[0064] Nutmeg extract, purchased from Xi'an Youshuo Biotechnology Co., Ltd., in powder form, with a mesh size of 80 mesh and a specification of 10:1;

[0065] Cinnamon oil extract, purchased from Hubei Darli Chemical Co., Ltd., product name Darl-1, with an active ingredient content of 99%; diatomaceous earth, purchased from Lingshou County Aohong Mineral Products Business Department, mesh size 400, specific surface area 1.8 m². 2 / g, Fe2O3 content is 0.11%, SiO2 content is 54%;

[0066] Methacryloxyethyl dimethyl benzyl ammonium chloride was purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd., CAS No. 46917-07-1.

[0067] Preparation Example 1

[0068] Antibacterial emulsions are prepared using the following method:

[0069] a. The cationic oxidized starch was dried at 80℃ for 2.5h to obtain the dried cationic oxidized starch; at 40℃ and 450r / min, 3kg of the dried cationic oxidized starch and 17.5kg of water were mixed and stirred for 10min, then 0.014kg of ferrous sulfate heptahydrate was added, and 0.8kg of H2O2 was slowly added. The temperature was then raised to 70℃, and 0.325kg of H2O2 was slowly added. The temperature was then raised to 90℃, and 0.24kg of methacryloyloxyethyl dimethyl benzyl ammonium chloride was added. The mixture was kept at this temperature for 40min.

[0070] b. Cool the product obtained in step a to 80°C, add 2.63 kg of butyl acrylate and 0.01 kg of initiator, keep the reaction at this temperature for 40 min, then add 2.25 kg of styrene and 0.012 kg of initiator, keep the reaction at this temperature for 1.5 h, then cool and filter to obtain an antibacterial emulsion.

[0071] Preparation Example 2

[0072] Antibacterial emulsions are prepared using the following method:

[0073] a. The cationic oxidized starch was dried at 85℃ for 2 hours to obtain the dried cationic oxidized starch. Under the conditions of 45℃ and 400 r / min, 3.5 kg of the dried cationic oxidized starch and 15 kg of water were mixed and stirred for 15 min. Then, 0.012 kg of ferrous sulfate heptahydrate was added, and 0.75 kg of H2O2 was slowly added. The temperature was then raised to 75℃, and 0.375 kg of H2O2 was slowly added. The temperature was then raised to 88℃, and 0.34 kg of methacryloyloxyethyl dimethyl benzyl ammonium chloride was added. The mixture was kept at this temperature for 30 min.

[0074] b. Cool the product obtained in step a to 82°C, add 2.25 kg of butyl acrylate and 0.012 kg of initiator, keep the reaction at this temperature for 30 min, then add 2.63 kg of styrene and 0.01 kg of initiator, keep the reaction at this temperature for 2 h, then cool and filter to obtain an antibacterial emulsion.

[0075] Preparation Example 3

[0076] The difference from Preparation Example 2 is that in step b, licorice extract is also added; specifically, 0.2 kg of licorice extract is dispersed in water to obtain an aqueous solution of licorice extract, and then after the addition of butyl acrylate and initiator, the aqueous solution of licorice extract is slowly added to the reaction system and the reaction is kept at a constant temperature for 30 min.

[0077] Preparation Example 4

[0078] The difference from Preparation Example 2 is that in step b, tea polyphenol extract is also added; specifically, 0.3 kg of tea polyphenol extract is dispersed in water to obtain an aqueous solution of tea polyphenol extract, and then after the addition of butyl acrylate and initiator, the aqueous solution of tea polyphenol extract is slowly added to the reaction system and the reaction is kept at a constant temperature for 30 min.

[0079] Preparation Example 5

[0080] The difference from Preparation Example 2 is that in step b, nutmeg extract is also added; specifically, 0.2 kg of nutmeg extract is dispersed in water to obtain an aqueous solution of nutmeg extract, and then after the addition of butyl acrylate and initiator, the aqueous solution of nutmeg extract is slowly added to the reaction system and the reaction is kept at a constant temperature for 30 min.

[0081] Preparation Example 6

[0082] The difference from Preparation Example 2 is that in step b, cinnamon oil extract is also added; specifically, after the addition of butyl acrylate and initiator, 0.2 kg of cinnamon oil extract is slowly added to the reaction system and the mixture is kept warm for 30 min.

[0083] Preparation Example 7

[0084] The difference from Preparation Example 2 is that in step b, cinnamon oil extract is also added; specifically, after the addition of butyl acrylate and initiator, 0.244 kg of cinnamon oil extract is slowly added to the reaction system and the mixture is kept warm for 30 min.

[0085] Preparation Example 8

[0086] The difference from Preparation Example 2 is that in step b, cinnamon oil extract is also added; specifically, after the addition of butyl acrylate and initiator, 0.268 kg of cinnamon oil extract is slowly added to the reaction system and the mixture is kept warm for 30 min.

[0087] Preparation Example 9

[0088] The difference from Preparation Example 2 is that in step b, cinnamon oil extract is also added; specifically, after the addition of butyl acrylate and initiator, 0.146 kg of cinnamon oil extract is slowly added to the reaction system and the mixture is kept warm for 30 min.

[0089] Preparation Example 10

[0090] The difference from Preparation Example 2 is that in step b, cinnamon oil extract is also added; specifically, after the addition of butyl acrylate and initiator, 0.342 kg of cinnamon oil extract is slowly added to the reaction system and the mixture is kept warm for 30 min.

[0091] Preparation Example 11

[0092] The difference from Preparation Example 2 is that in step a, 0.34 kg of methacryloyloxyethyl dimethyl benzyl ammonium chloride was replaced with 0.3 kg of cinnamon oil extract.

[0093] Comparative Preparation Example 1

[0094] The difference from Preparation Example 2 is that in step a, methacryloyloxyethyl dimethyl benzyl ammonium chloride is not added for the heat preservation reaction.

[0095] Comparative Preparation Example 2

[0096] The difference from Preparation Example 2 is that in step a, methacryloyloxyethyl dimethyl benzyl ammonium chloride is replaced with dimethyloctadecyl[3-(trimethoxysilyl)propyl] ammonium chloride, which was purchased from Shanghai Shenzhi Chemical Technology Co., Ltd., model 5700, CAS number 27668-52-6.

[0097] Comparative preparation example 3

[0098] The difference from Preparation Example 2 is that in step a, methacryloyloxyethyl dimethyl benzyl ammonium chloride is replaced with methacryloyloxyethyl trimethyl ammonium chloride, which was purchased from Guangdong Fangxin Biotechnology Co., Ltd., CAS No. 5039-78-1.

[0099] Comparative preparation example 4

[0100] The difference from Preparation Example 2 is that in step a, methacryloyloxyethyl dimethyl benzyl ammonium chloride is replaced with hexadecyl dimethyl allyl ammonium chloride, which was purchased from Chongqing Ruiya Biotechnology Co., Ltd., CAS No. 7398-69-8.

[0101] Comparative preparation example 5

[0102] The difference from Preparation Example 2 is that in step a, the amount of methacryloyloxyethyl dimethyl benzyl ammonium chloride used is 0.2 kg.

[0103] Comparative preparation example 6

[0104] The difference from Preparation Example 2 is that in step a, the amount of methacryloyloxyethyl dimethyl benzyl ammonium chloride used is 0.4 kg.

[0105] Preparation Example 12

[0106] Diatomaceous earth loaded with manganese dioxide is prepared by the following method:

[0107] 10 kg of diatomaceous earth was immersed in 50 L of 0.03 mol / L potassium permanganate solution, 8 kg of citric acid was added, and the pH was adjusted to 6 with ammonia water. The mixture was then ultrasonically vibrated for 2 h, dried to constant weight at 70 °C, calcined at 620 °C for 0.6 h, cooled to room temperature, stirred evenly, and ultrasonically vibrated for 30 min to obtain diatomaceous earth loaded with manganese dioxide.

[0108] Preparation Example 13

[0109] Diatomaceous earth loaded with manganese dioxide is prepared by the following method:

[0110] 12.5 kg of diatomaceous earth was immersed in 50 L of 0.2 mol / L potassium permanganate solution, 12.5 kg of citric acid was added, and the pH was adjusted to 5 with ammonia. The mixture was then ultrasonically vibrated for 2.5 h, dried to constant weight at 60 °C, calcined at 650 °C for 0.5 h, cooled to room temperature, stirred evenly, and ultrasonically vibrated for 40 min to obtain diatomaceous earth-loaded manganese dioxide.

[0111] Preparation Example 14

[0112] The difference from Preparation Example 12 is that the concentration of the potassium permanganate solution is 0.06 mol / L.

[0113] Preparation Example 15

[0114] The difference from Preparation Example 12 is that the concentration of the potassium permanganate solution is 0.1 mol / L.

[0115] Preparation Example 16

[0116] The difference from Preparation Example 12 is that the concentration of the potassium permanganate solution is 0.08 mol / L.

[0117] Preparation Example 17

[0118] The difference from Preparation Example 13 is that diatomaceous earth-supported manganese dioxide was prepared using manganese dioxide powder, and the specific steps are as follows:

[0119] 10 kg of diatomaceous earth and 2 kg of manganese dioxide powder were dispersed and stirred evenly with 50 mL of distilled water. 10 kg of citric acid was added and the pH was adjusted to 5 with ammonia water. The mixture was then ultrasonically vibrated for 2.5 h, dried to constant weight at 60 °C, ground, and calcined at 650 °C for 0.5 h. After cooling to room temperature, the mixture was stirred evenly and ultrasonically vibrated for 40 min to obtain diatomaceous earth-loaded manganese dioxide.

[0120] Example 1

[0121] A method for preparing a crystal diamond coating includes the following steps:

[0122] S1. Preparation of basic paint slurry: At a speed of 300 r / min, 5.34 kg of water, 0.01 kg of defoamer, 0.08 kg of ethylene glycol, and 0.18 kg of film-forming aid were added to a mixing tank and stirred for 5 min. Then, the speed was increased to 800 r / min, and 0.04 kg of bentonite, 0.05 kg of suspending agent, and 0.06 kg of cellulose were added and stirred for 5 min. Then, 0.03 kg of deodorizing multifunctional additive was added and the speed was increased to 1300 r / min. The mixture was stirred at high speed for 15 min, and then the speed was reduced to 600 r / min. 3.8 kg of the antibacterial emulsion prepared in Preparation Example 1, 0.03 kg of thickener, and 0.16 kg of water were added and mixed and stirred for 5 min to obtain the basic paint slurry.

[0123] S2. Preparation of Crystal Diamond Coating: Mix 9 kg of base paint slurry and 9 kg of crystal diamond evenly to obtain crystal diamond coating.

[0124] Example 2

[0125] A method for preparing a crystal diamond coating includes the following steps:

[0126] S1. Preparation of basic paint slurry: At a speed of 300 r / min, 4.85 kg of water, 0.05 kg of defoamer, 0.03 kg of ethylene glycol, and 0.22 kg of film-forming aid were added to a mixing tank and stirred for 5 min. Then, the speed was increased to 800 r / min, and 0.03 kg of bentonite, 0.07 kg of suspending agent, and 0.02 kg of cellulose were added and stirred for 5 min. Then, 0.04 kg of deodorizing multifunctional additive was added and the speed was increased to 1300 r / min. The mixture was stirred at high speed for 15 min, and then the speed was reduced to 600 r / min. 4.2 kg of the antibacterial emulsion prepared in Preparation Example 2, 0.02 kg of thickener, and 0.15 kg of water were added and mixed and stirred for 10 min to obtain the basic paint slurry.

[0127] S2. Preparation of Crystal Diamond Coating: Mix 9 kg of base paint slurry and 27 kg of crystal diamond evenly to obtain crystal diamond coating.

[0128] Example 3-11

[0129] A method for preparing a crystal diamond coating differs from Example 2 in that the antibacterial emulsion obtained in Preparation Example 2 in step S1 is replaced with the antibacterial emulsion obtained in Preparation Examples 3-11.

[0130] Example 12

[0131] A method for preparing a crystal diamond coating differs from Example 2 in that: in step S1, after adding the deodorizing multifunctional additive, 0.05 kg of diatomaceous earth-supported manganese dioxide prepared in Preparation Example 12 is added and stirred at high speed together.

[0132] Example 13

[0133] A method for preparing a crystal diamond coating differs from Example 2 in that: in step S1, after adding the deodorizing multifunctional additive, 0.08 kg of diatomaceous earth-supported manganese dioxide prepared in Preparation Example 13 is added and stirred at high speed together.

[0134] Examples 14-16

[0135] A method for preparing a crystal diamond coating differs from Example 12 in that the diatomaceous earth-supported manganese dioxide obtained in Example 12 is replaced with the diatomaceous earth-supported manganese dioxide obtained in Examples 14-16.

[0136] Example 17

[0137] A method for preparing a crystal diamond coating differs from Example 2 in that: in step S1, after adding the deodorizing multifunctional additive, 0.02 kg of diatomaceous earth-supported manganese dioxide prepared in Preparation Example 13 is added and stirred at high speed together.

[0138] Example 18

[0139] A method for preparing a crystal diamond coating differs from Example 2 in that: in step S1, after adding the deodorizing multifunctional additive, 0.1 kg of diatomaceous earth-supported manganese dioxide prepared in Preparation Example 13 is added and stirred at high speed together.

[0140] Example 19

[0141] A method for preparing a crystal diamond coating differs from Example 2 in that: in step S1, after adding the deodorizing multifunctional additive, 0.08 kg of diatomaceous earth-supported manganese dioxide prepared in Preparation Example 17 is added and stirred at high speed together.

[0142] Comparative Example 1

[0143] The difference from Example 2 is that the antibacterial emulsion prepared in Example 2 in step S1 is replaced with the antibacterial emulsion prepared in Comparative Example 1, and 0.06 kg of preservative and bactericide is added after the thickener and water are added. The preservative and bactericide is purchased from Osada and the model is PROXOL 106.

[0144] Comparative Examples 2-6

[0145] The difference from Example 2 is that the antibacterial emulsion prepared in Example 2 in step S1 is replaced with the antibacterial emulsion prepared in Comparative Examples 2-6.

[0146] Performance testing

[0147] 1. Antibacterial properties and antibacterial durability: Examples 1-19 and Comparative Examples 1-6 were tested according to GB / T 21866-2008. For the antibacterial durability test, a 30W, 253.7nm UV lamp as specified in the national standard was used, and the samples were irradiated for 100 hours at a distance of 0.8-1.0m. *Escherichia coli* and *Staphylococcus aureus* were selected as the experimental strains. The test results are shown in Table 1. 2. Antifungal properties: A 30W, 253.7nm UV lamp as specified in the national standard was used, and the samples were irradiated for 100 hours at a distance of 0.8-1.0m. Reference was made to HG / T... 3950-2007 tested Examples 1-19 and Comparative Examples 1-6. The mold growth grade evaluation criteria were: "Grade 0: No growth, i.e., no signs of growth observed under a microscope (50x magnification); Grade 1: Growth, i.e., visible growth, but the growth area coverage is less than 10%; Grade 2: Growth coverage area is greater than 10%". The test results are shown in Table 1. 3. Antiviral performance: Examples 1-19 and Comparative Examples 1-6 were tested according to ISO 21702-2019. The test virus was enterovirus EV71. The test results are shown in Table 1.

[0148] 4. Formaldehyde Removal Ability: A 5cm×5cm×1cm wood board was soaked in a 20wt% formaldehyde aqueous solution for 18 hours. Then, the wood board was extracted with 100mL of distilled water at 45±2℃ in a sealed constant temperature water bath for 60 minutes. The residual formaldehyde concentration was measured to be CO at a wavelength of 412nm. The wood board and samples prepared with the coatings used in Examples 1-19 and Comparative Examples 1-6 were then placed in a sealed vacuum container, immediately covered and sealed, and placed at room temperature under normal light. After 30 hours, the wood panels were soaked in 100 mL of distilled water at 45±2℃ to extract the remaining formaldehyde. The amount of remaining formaldehyde, C1, was measured by spectrophotometer. After removing the formaldehyde-containing wood panels, the reactor was immediately sealed. One end of a vacuum pump was connected to the reactor, and the other end was connected to 100 mL of cold distilled water. The vacuum pump was started for 15 seconds to extract the remaining volatilized formaldehyde, C2, from the reactor. The adsorption and decomposition rate of formaldehyde, F, was calculated using the following formula: F=(C0-C1-C2)×100% / C0; the results are shown in Table 1.

[0149] 5. Scrub resistance: Examples 1-19 and Comparative Examples 1-6 were tested according to GB / T 9266-2009, and the number of scrubs when the coating was damaged and the substrate was exposed was recorded.

[0150] Table 1 Performance Test Results

[0151]

[0152]

[0153] As can be seen from Table 1, the antibacterial rate of the crystal diamond coatings prepared in Examples 1-2 of this application reached 99.363-99.372% (meeting the Class I antibacterial requirement in the standard, which requires >99%), the durable antibacterial rate reached 95.62-95.67% (meeting the Class I durable antibacterial requirement in the standard, which requires >95%), the anti-mildew level was 0 (meeting the Class I anti-mildew requirement in the standard, which requires 0), the antiviral activity rate was 97.8-97.9%, the formaldehyde adsorption and decomposition rate was 48.27-48.31%, and according to the method in GB / T9266-2009, the number of times the coating was washed after being damaged and exposing the substrate was greater than 2000 times. Experimental data show that the crystal diamond coatings prepared in Examples 1-2 of this application have strong broad-spectrum antibacterial capabilities. They not only exhibit good antibacterial activity against bacteria and mold, but also demonstrate excellent inactivation effects against non-enveloped enterovirus EV71. Furthermore, the antibacterial components are less prone to migration, degradation, or discoloration within the coating, resulting in more durable antibacterial performance. Simultaneously, the crystal diamond coatings also possess excellent formaldehyde removal capabilities, effectively and efficiently adsorbing and decomposing indoor formaldehyde under normal temperature, pressure, and light conditions. In addition, the crystal diamond coatings prepared in Examples 1-2 of this application have strong decorative properties, are highly washable, easy to clean, and have extremely low VOC content, making them environmentally friendly and suitable for widespread application in various locations with high antibacterial and environmental protection requirements.

[0154] The difference between Examples 3-10 and Example 2 is that a natural antibacterial agent was used in combination with methacryloyloxyethyl dimethyl benzyl ammonium chloride, and both were introduced into the copolymer chain of the bio-based styrene-acrylic emulsion. As shown in Table 1, the antibacterial rate and durable antibacterial rate of Examples 3-10 were significantly higher than those of Example 2. Furthermore, the difference between Example 11 and Example 2 is that a natural antibacterial agent was used instead of methacryloyloxyethyl dimethyl benzyl ammonium chloride. As shown in Table 1, the antibacterial rate and durable antibacterial rate of Example 11 were similar to those of Example 2, both significantly lower than the antibacterial rate and durable antibacterial rate when the two were used in combination. The experimental results indicate that the combined use of a natural antibacterial agent and methacryloyloxyethyl dimethyl benzyl ammonium chloride can fully utilize their synergistic antibacterial effect, thereby enhancing the bactericidal ability of the bio-based styrene-acrylic emulsion. Among them, the antibacterial rate and durable antibacterial rate of Examples 9-10 were slightly worse than those of Example 8. This indicates that further optimization of the amount of natural antibacterial agent can ensure a good grafting effect of natural antibacterial agent, thereby enhancing the bactericidal ability of bio-based styrene-acrylic emulsion.

[0155] The difference between Examples 12-13 and Example 2 is that diatomaceous earth-supported manganese dioxide was added. As shown in Table 1, the formaldehyde adsorption and decomposition rate of Examples 12-13 was significantly higher than that of Example 2. The experimental results indicate that the addition of diatomaceous earth-supported manganese dioxide can synergistically work with components such as bio-based styrene-acrylic emulsion and odor-neutralizing multifunctional additives, improving the formaldehyde removal capacity of the Crystal Diamond Coating under normal temperature, pressure, and light conditions, enabling long-term and efficient adsorption and decomposition of indoor formaldehyde.

[0156] The difference between Examples 14-16 and Example 12 lies in the further optimization of the potassium permanganate solution concentration. As shown in Table 1, the formaldehyde adsorption and decomposition rate of Examples 14-16 is higher than that of Example 12. Experimental data indicates that further optimization of the potassium permanganate solution concentration can further improve the formaldehyde removal ability of the Crystal Diamond coating under normal temperature, normal pressure, and normal light conditions. Specifically, when the concentration of the potassium permanganate solution is controlled at 0.08 mol / L, the formaldehyde adsorption and decomposition rate of the Crystal Diamond coating can reach 95.17%.

[0157] The difference between Example 17 and Example 2 is that manganese dioxide powder was added to prepare diatomaceous earth-supported manganese dioxide. As shown in Table 1, although the formaldehyde adsorption and decomposition rate of Example 17 was higher than that of Example 2, it was lower than that of Example 13. The experimental results indicate that the diatomaceous earth-supported manganese dioxide prepared using potassium permanganate solution has a stronger adsorption and decomposition effect on formaldehyde compared to the diatomaceous earth-supported manganese dioxide prepared using manganese dioxide powder, further improving the formaldehyde removal ability of the crystal diamond coating under normal temperature, normal pressure, and normal light conditions.

[0158] The difference between Examples 18-19 and Example 2 is that a certain amount of diatomaceous earth-supported manganese dioxide was added. As can be seen from Table 1, although the formaldehyde adsorption and decomposition rate of Examples 18-19 is higher than that of Example 2, it is lower than that of Example 13. The experimental results show that too little or too much addition of diatomaceous earth-supported manganese dioxide will affect the formaldehyde removal ability of the crystal diamond coating under normal temperature, normal pressure and normal light.

[0159] The difference between Comparative Example 1 and Example 2 is that the prepared crystal diamond coating is an additive antibacterial coating. As shown in Table 1, although the antibacterial rate of Comparative Example 1 is 99.079% (meeting the Class I antibacterial requirement in the standard, which requires >99%), its durable antibacterial rate is 93.06% (not meeting the Class I durable antibacterial requirement in the standard, which requires >95%), its antifungal performance is Class 1, and its antiviral activity rate is only 12.2%, significantly worse than Example 2. The test results indicate that the structural antibacterial coating prepared in this application has strong broad-spectrum antibacterial ability, exhibiting good antibacterial activity against bacteria and molds, as well as good inactivation of non-enveloped enterovirus EV71. Furthermore, the antibacterial components are less prone to migration, degradation, or discoloration within the coating, resulting in more durable antibacterial performance.

[0160] The difference between Comparative Examples 2-4 and Example 2 is that dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, methacryloyloxyethyltrimethylammonium chloride, and hexadecyldimethylallylammonium chloride were used instead of methacryloyloxyethyldimethylbenzylammonium chloride. As shown in Table 1, although the antibacterial rate and durable antibacterial rate of Comparative Examples 2-4 were similar to those of Example 2, their antiviral activity against enterovirus EV71 was only 12.1-12.2%. The experimental results indicate that compared to other quaternary ammonium salt antibacterial agents, methacryloyloxyethyldimethylbenzylammonium chloride can give the coating a broader spectrum of antibacterial activity. It not only has good antibacterial activity against Staphylococcus aureus and Escherichia coli, but also exhibits good antiviral activity against enterovirus EV71, demonstrating significant application value.

[0161] The difference between Comparative Examples 5-6 and Example 2 lies in the amount of methacryloyloxyethyl dimethyl benzyl ammonium chloride used. As shown in Table 1, the antibacterial rate, durable antibacterial rate, and antiviral activity rate of Comparative Examples 5-6 are slightly lower than those of Example 2. The experimental results indicate that further optimization of the amount of methacryloyloxyethyl dimethyl benzyl ammonium chloride can ensure a good grafting effect, thereby enhancing the bactericidal ability of the bio-based styrene-acrylic emulsion.

[0162] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A crystal diamond coating, characterized in that, It includes a base slurry and crystal diamond in a weight ratio of (2-4):(4-6); wherein the raw materials used in the base slurry include the following components in parts by weight: Antibacterial emulsion, 380-420 parts; 500-550 parts water; 1-5 parts of defoamer; 3-8 parts ethylene glycol; 18-22 parts of film-forming aid; 3-4 parts bentonite; 5-7 parts of suspension concentrate; 2-6 parts cellulose; 3-4 parts of deodorizing multifunctional additive; Thickener 2-3 parts; The antibacterial emulsion is a bio-based styrene-acrylic emulsion with antibacterial groups; The antibacterial emulsion is prepared by the following method: a. Dry the cationic oxidized starch at 80-85℃ for 2-2.5h to obtain dried cationic oxidized starch; under the conditions of 40-45℃ and 400-450r / min, mix 30-35 parts by weight of the dried cationic oxidized starch and 150-175 parts by weight of water and stir for 10-15min, then add 0.12-0.14 parts by weight of ferrous sulfate heptahydrate and 7.5-8.0 parts by weight of H2O2, then raise the temperature to 70-75℃, continue to add 3.25-3.75 parts by weight of H2O2, then raise the temperature to 88-90℃, add 2.4-3.4 parts by weight of methacryloyloxyethyl dimethyl benzyl ammonium chloride, and keep warm for 30-40min; b. Cool the product obtained in step a to 80-82℃, add 22.5-26.3 parts by weight of butyl acrylate and 0.1-0.12 parts by weight of initiator, keep the reaction at this temperature for 30-40 min, then add 22.5-26.3 parts by weight of styrene and 0.1-0.12 parts by weight of initiator, keep the reaction at this temperature for 1.5-2.0 h, then cool and filter to obtain an antibacterial emulsion; In step b, after adding butyl acrylate and the initiator, a natural antibacterial agent is added to the system. The amount of the natural antibacterial agent added is 4-6 wt% of the total amount of butyl acrylate and styrene. The natural antibacterial agent includes one of the following: licorice extract, tea polyphenol extract, nutmeg extract, and cinnamon oil extract; The basic slurry also includes 5-8 parts by weight of diatomaceous earth-loaded manganese dioxide; The diatomaceous earth loaded with manganese dioxide was prepared by the following method: Diatomaceous earth was immersed in a potassium permanganate solution with a concentration of 0.03-0.2 mol / L. Citric acid was added and the pH was adjusted to 5-6 with ammonia. The mixture was then ultrasonically vibrated for 2-2.5 h, dried to constant weight at 60-70℃, and calcined at 620-650℃ for 0.5-0.6 h. After cooling to room temperature, the mixture was stirred evenly and ultrasonically vibrated for 30-40 min to obtain diatomaceous earth loaded with manganese dioxide. The mass-to-volume ratio of diatomaceous earth to potassium permanganate solution was 0.2-0.25 g / mL, and the weight ratio of citric acid to diatomaceous earth was (0.8-1.0):

1.

2. The crystal diamond coating according to claim 1, characterized in that, The amount of the natural antibacterial agent added is 5-5.5 wt% of the total amount of butyl acrylate and styrene.

3. The crystal diamond coating according to claim 1, characterized in that, The concentration of the potassium permanganate solution is 0.06-0.1 mol / L.

4. The crystal diamond coating according to claim 1, characterized in that, The concentration of the potassium permanganate solution is 0.08 mol / L.

5. A method for preparing a crystal diamond coating according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Preparation of base paint slurry: Mix and stir the raw materials for base paint slurry at a speed of 300-1300 r / min for 30-35 min to obtain base paint slurry; S2. Preparation of Crystal Diamond Coating: Mix the base paint slurry and crystal diamond evenly to obtain crystal diamond coating.

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