A long-lasting antiviral coating and its preparation method

Abstract

This invention discloses a long-lasting antiviral coating, comprising the following components by mass percentage: 45%–50% pure water; 0.1%–0.2% thickener; 0.1%–0.2% multifunctional additive; 0.6%–0.8% dispersant; 0.2%–0.3% defoamer; 0.1%–0.2% wetting agent; 0.5%–2.0% antiviral powder; 3.0%–5.0% titanium dioxide; 15%–25% filler; 10%–15% silica sol solution; 5.0%–10% potassium silicate solution; 0.5%–1.0% N-hydroxydiethanolamine; 2.0%–5.0% antiviral additive; 0.1%–0.5% bactericide and preservative; 0.1%–0.5% mildew inhibitor; and 0.1%–0.5% rheology modifier. This invention uses a mixture of silica sol and potassium silicate to form a film, and adds zeolite-loaded silver antiviral additives and functional powders containing antiviral materials. The final coating has the characteristics of being environmentally friendly and having a long-lasting antiviral effect.

Description

Technical Field

[0001] This invention relates to the field of architectural coatings technology, specifically to a long-lasting antiviral coating and its preparation method. Background Technology

[0002] Architectural coatings are an important component of the coatings industry, and can be categorized into decorative coatings and functional coatings based on their characteristics. Currently, in the field of functional antibacterial coatings, extensive research has been conducted on preventing bacterial transmission and microbial film formation by inhibiting and killing the growth of bacteria and microorganisms within the coating container and by killing or reducing microorganisms adhering to the coating surface. However, research on the environmentally friendly and antiviral properties of the coatings themselves is scarce. In recent years, the increasing understanding and awareness of pathogens and their spread has created a broad market prospect for the development of environmentally friendly and antiviral coatings.

[0003] Currently, antiviral coatings on the market are mainly divided into two types: (1) the film-forming substance is an aqueous emulsion, and antiviral substances are added to the formulation system to obtain an antiviral coating; (2) the film-forming substance is a two-component system of acrylic resin and epoxy resin, and antiviral substances are added to the formulation system to obtain an antiviral coating. Among them, aqueous emulsion antiviral coatings have poor stability, while two-component resin antiviral coatings have poor environmental performance.

[0004] Therefore, there is an urgent need to develop a long-lasting antiviral coating that combines stability and environmental friendliness, as well as its preparation method. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a long-lasting antiviral coating and its preparation method. This invention utilizes an environmentally friendly silica sol compounded with potassium silicate to form a film, ensuring its stability and environmental friendliness. Zeolite-loaded silver antiviral additives and functional powders containing antiviral materials (modified nano-TiO2 and nano-CuFeO2 particles) are added to the coating system. The resulting inorganic antiviral coating possesses both environmental friendliness and long-lasting antiviral properties. Furthermore, the addition of the hydrophilic chain extender N-hydroxydiethanolamine improves the flexibility of the coating film, ultimately enhancing its elasticity and stability. This extends the lifespan of the coating film, thereby prolonging its antiviral effectiveness. The combined use of antiviral powders and zeolite-loaded silver antiviral additives strengthens the antiviral properties and durability of the coating film. This invention must meet the following requirements in terms of environmental protection: HJ2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings"; inorganic properties: JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings"; and antiviral properties: T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings".

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A long-lasting antiviral coating, characterized in that it comprises the following components by weight percentage:

[0008]

[0009] Preferably, the silica sol solution is Kehan's silica sol solution KHZCM-30; the potassium silicate solution is Xipusen Chemical's nano-modified potassium silicate KS33; the bond between the silica sol and potassium silicate is a molecular-level chemical bond (-Si-O-Si-), the nano-modified potassium silicate liquid is dispersed and wrapped between silica sol colloidal particles with an average particle size of 10-20nm, the strong alkalinity of potassium silicate first allows for a certain depth of fusion and penetration into the surface of the silica sol colloidal particles (SiO2), and then solidification occurs to form a film.

[0010] The pH value of silica sol is generally between 8.0 and 9.5, much lower than that of potassium silicate (pH 11-13). When silica sol is combined with potassium silicate, the pH value of the resulting mixture will be slightly lower, and the pH value of the formulated coating is generally between the ideal 11.0 and 11.5, thus increasing safety in use. Therefore, the formulation does not require the addition of organic solvents for film formation, ultimately meeting the requirements for odor-free and environmentally friendly products.

[0011] Preferably, the antiviral powder is a functional powder prepared by encapsulating well-dispersed antiviral materials with silica aerogel; the antiviral material is modified nano-TiO2 and nano-CuFeO2 particles.

[0012] Antiviral powder (TiO2-SiO2-CuFeO2): prepared by physicochemical reaction of silica prepared by sol-gel method simultaneously coated with nano-TiO2 prepared by gas phase method and nano-CuFeO2 particles prepared by sol-gel method.

[0013] The antiviral powder is prepared through the following steps:

[0014] (1) In the process of preparing silica by sol-gel method using silane compounds, solvents and catalysts, there are a large number of hydroxyl groups on the surface of silane compounds. Taking advantage of the reactivity of the hydroxyl groups on the surface of silane compounds, nano-sized TiO2 and nano-sized CuFeO2 particles that can chemically react with the silanol groups on the gel surface are added. The hydroxyl reaction is carried out between 120℃ and 150℃. By controlling the reaction temperature and time, a suitable coating layer thickness is obtained. The resulting powder has a particle size of 1-15 μm. The mass ratio of silane compounds: nano-sized TiO2: nano-sized CuFeO2 is 10:1:9.

[0015] (2) The obtained powder is washed and separated with deionized water to remove unreacted compounds and impurities; then dried and vacuum impregnated to obtain TiO2-SiO2-CuFeO2 antiviral powder.

[0016] Preferably, the silane compound is tetraethoxysilane. The solvent is deionized water, and the amount of solvent is appropriate. The catalyst is a pH adjuster, which adjusts the pH of the reaction system to 5-6, causing the silane compound to undergo hydrolysis and condensation reactions. The nano-sized TiO2 is nano-TiO2 obtained by a gas-phase method. The nano-sized CuFeO2 particles are nano-CuFeO2 obtained by a sol-gel method.

[0017] More preferably, nano-TiO2 is prepared by a gas-phase method: a titanium source is oxidized into titanium dioxide vapor at high temperature, and nano-titanium dioxide is formed through a gas-phase reaction. Evonik - Industrial-grade vapor-phase titanium dioxide (Aeroxide TiO2) P25, particle size: 20-25nm, supplier: Shanghai Zhenlishi Network Technology Co., Ltd.

[0018] More preferably, nano-CuFeO2 prepared by the sol-gel method: Potassium hydroxide and sodium hydroxide are added to a Teflon plastic container at a molar ratio of 0.8:1 to 1:1.2, followed by copper and iron salts (copper to iron atomic ratio 1:1), and then oxalate. The mixture is stirred evenly with a glass rod and placed in a constant temperature oven at 190–220°C for 6–12 hours. After washing and drying, CuFeO2 nanostructures (300-600 nm) are obtained. The copper salt is one or a combination of copper chloride, copper nitrate, and copper acetate. The iron salt is one or a combination of ferric chloride, ferrous chloride, ferric nitrate, and ferric p-toluenesulfonate. The oxalate is one or a combination of sodium oxalate and potassium oxalate. These can be purchased from the supplier: Hefei Cuili New Material Technology Co., Ltd.

[0019] The antiviral powder directly contacts the negatively charged virus with its metal ions, which are then firmly adsorbed by Coulomb attraction, causing functional group reactions that disrupt the virus's structure and ultimately achieve antiviral effects, while also prolonging the antiviral properties of the inorganic coating film.

[0020] Preferably, the antiviral adjuvant is a zeolite-loaded silver antiviral adjuvant. Zeolite is a natural mineral, mainly composed of silicates and aluminates. The zeolite-loaded silver antiviral adjuvant is prepared by loading silver ions, which have the strongest antiviral activity, onto zeolite through physical adsorption and ion exchange. This antiviral adjuvant works by having its metal ions directly contact the negatively charged virus, adsorbing it firmly through Coulomb attraction, causing functional group reactions that destroy its structure; another principle is that the metal ions penetrate into the virus's interior, destroying its structure, ultimately achieving antiviral efficacy and prolonging the antiviral properties of the inorganic coating film.

[0021] N-Hydroxydiethanolamine, a hydrophilic chain extender, improves the toughness of inorganic coatings. While the addition of antiviral powder to inorganic coatings increases the antiviral properties of the film, it can also affect its flexibility. Therefore, by adding this hydrophilic chain extender, N-hydroxydiethanolamine improves the flexibility of the film, ultimately enhancing its elasticity and stability. This, in turn, extends the lifespan of the coating and prolongs the duration of its antiviral effect.

[0022] Preferably, the thickener is hydroxyethyl cellulose, which can stabilize the storage state of the coating.

[0023] Preferably, the multifunctional additive is a pH adjuster.

[0024] Preferably, the dispersant is sodium polyacrylate, which is beneficial for the dispersion of pigments and fillers.

[0025] Preferably, the defoamer is a mineral oil defoamer, which is beneficial to the workability of the coating and does not affect the appearance of the paint film.

[0026] Preferably, the wetting agent is a nonionic surfactant, which is beneficial to the stability of the pigments and fillers after dispersion.

[0027] Preferably, the titanium dioxide is rutile titanium dioxide;

[0028] Preferably, the filler is 700-mesh heavy calcium carbonate and calcined kaolin, which is beneficial to the stability of the coating during storage and its workability.

[0029] Preferably, the bactericide and preservative are isothiazolinone (CIT+MIT) bactericides and benzisothiazolinone (BIT) bactericides, which are beneficial to the storage performance of the coating.

[0030] Preferably, the antifungal agent is an isothiazolone antifungal agent, which is beneficial to the antifungal properties of the paint film.

[0031] Preferably, the leveling modifier is polyurethane, which is beneficial to the workability, feel, and appearance of the coating film.

[0032] Another object of the present invention is to disclose a method for preparing the above-mentioned long-acting antiviral coating, comprising the following steps:

[0033] (1) Add pure water, thickener, and multifunctional additive to the reactor and stir at low speed for 15-20 minutes until the thickener is completely swollen.

[0034] (2) Add dispersant, wetting agent and part of defoamer, and stir at medium speed for 10-20 minutes;

[0035] (3) Add antiviral powder and stir at high speed for 1-2 minutes until well mixed;

[0036] (4) Add titanium dioxide and filler, stir at high speed for 15-20 minutes until the fineness is ≤50um;

[0037] (5) Add silica sol solution and stir at medium speed for 3-5 minutes;

[0038] (6) Add potassium silicate solution and stir at medium speed for 5-10 minutes;

[0039] (7) Add the hydrophilic chain extender N-hydroxydiethanolamine and stir at medium speed for 1-2 minutes;

[0040] (8) Add antiviral agent and stir at medium speed for 1-2 minutes;

[0041] (9) Add bactericide, preservative, mildew inhibitor and the remaining defoamer, and stir at medium speed for 3-5 minutes;

[0042] (10) Add rheology modifier and stir at medium speed for 3-5 minutes to obtain the finished product.

[0043] The speed ranges from 500-800 rpm for low speed, 1000-1200 rpm for medium speed, and 1500-1800 rpm for high speed. The defoamer added in step (2) accounts for 1 / 3 to 3 / 4 of the total mass of the defoamer.

[0044] The working principle of this invention is as follows:

[0045] First, the bonding between the silica sol and potassium silicate in this invention is a molecular-level chemical bond (-Si-O-Si-). The nano-modified potassium silicate liquid is dispersed and encapsulated between silica sol colloidal particles with an average particle size of 10-20 nm. The strong alkalinity of potassium silicate allows for deep fusion and penetration into the surface of the silica sol colloidal particles (SiO2), followed by condensation polymerization to solidify into a film with extremely strong adhesion. The pH value of silica sol is generally between 8.0 and 9.5, much lower than that of potassium silicate (pH 11-13). The pH value of the mixture after silica sol is compounded with potassium silicate will be slightly lower, and the pH value of the formulated coating is generally between the ideal 11.0 and 11.5. This increases the safety of use, thus eliminating the need to add organic solvents to the formulation for film formation, ultimately meeting the requirements of odorless and environmentally friendly production.

[0046] Secondly, the antiviral powder of the present invention is a functional powder prepared by encapsulating well-dispersed antiviral materials (modified nano-TiO2 and nano-CuFeO particles) with silica aerogel. This antiviral powder achieves its antiviral effect by having its metal ions directly contact the negatively charged virus, which is then firmly adsorbed through Coulomb attraction, causing functional group reactions that disrupt the virus's structure. This also prolongs the antiviral properties of the inorganic coating film.

[0047] Third, the antiviral adjuvant is a zeolite-loaded silver antiviral adjuvant. Zeolite is a natural mineral, mainly composed of silicates and aluminates. Silver ions, the most potent antiviral agent, are loaded onto the zeolite through physical adsorption and ion exchange. This antiviral adjuvant works in two ways: firstly, its metal ions directly contact the negatively charged virus, adsorbing it firmly through Coulomb attraction, causing a functional group reaction that disrupts its structure; secondly, the metal ions penetrate the virus's interior, further damaging its structure, ultimately achieving antiviral efficacy and prolonging the antiviral properties of the inorganic coating film.

[0048] Fourth, the N-hydroxydiethanolamine of this invention is a hydrophilic chain extender that improves the toughness of inorganic coatings. While the addition of antiviral powder to inorganic coatings increases the antiviral properties of the paint film, it also affects its flexibility. Therefore, by adding this hydrophilic chain extender, N-hydroxydiethanolamine, the flexibility of the paint film is improved, ultimately enhancing the elasticity and stability of the inorganic coating. This ultimately extends the service life of the paint film, thereby prolonging the duration of its antiviral effect.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0050] The bonding between the silica sol and potassium silicate in this invention is a molecular-level chemical bond (-Si-O-Si-), exhibiting extremely strong adhesion. This is beneficial for film formation, odor removal, and environmental protection.

[0051] The antiviral powder of this invention is prepared by encapsulating well-dispersed antiviral materials (modified nano-TiO2 and nano-CuFeO particles) with silica aerogel to obtain a functional powder. The antiviral additive is a zeolite-loaded silver antiviral additive. This improves the long-lasting antiviral properties of the coating film.

[0052] The hydrophilic chain extender N-hydroxydiethanolamine used in this invention improves the toughness of inorganic coatings, stabilizes them, and ultimately extends the service life of their coating films. Detailed Implementation

[0053] The method of the present invention will be described below through specific embodiments, but the present invention is not limited thereto. Unless otherwise specified, the experimental methods described in the following embodiments are conventional methods; the reagents and materials described, unless otherwise specified, are commercially available.

[0054] Example 1

[0055] Preparation steps of the product of this invention (all percentages are by weight):

[0056] A) Add 48.79% pure water to a stirred tank, and add 0.18% hydroxyethyl cellulose (250HBR) and 0.15% multifunctional additive (neutralizing agent VANTEX-T) while stirring at low speed (500-800 rpm).

[0057] B) After the cellulose is completely dissolved, add 0.8% dispersant (Dow Dispersant 1288), 0.1% wetting agent (ZETASPERSE 179), and 0.1% defoamer (mineral oil F-1860). Stir and disperse at room temperature at medium speed (1000-1200 rpm) for 15 minutes.

[0058] C) Add 0.5% antiviral powder (antiviral powder (TiO2-SiO2-CuFeO2)), 3.0% titanium dioxide (rutile titanium dioxide 996), and 25.0% conventional filler (15.0% calcined kaolin and 10.0% 700 mesh calcium carbonate), and stir at high speed (1500-1800 rpm) for 20 minutes until the fineness is qualified (≤50um);

[0059] D) After stopping stirring, add 10.0% silica sol solution (Kehan's silica sol solution KHZCM-30) and stir at medium speed (1000-1200 rpm) for 5 minutes;

[0060] E) After stopping stirring, add 5.0% potassium silicate solution (Sipusen Chemical's nano-modified potassium silicate KS33) and stir at medium speed (1000-1200 rpm) for 10 minutes;

[0061] F) Add 0.5% of the hydrophilic chain extender N-hydroxydiethanolamine while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0062] G) Add 5.0% of antiviral agent (zeolite silver-loaded agent) while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0063] H) Add 0.05% of a bactericide and preservative (isothiazolinone). LPC5), 0.08% bactericide and preservative (a mixture of isothiazolinone and benzisothiazolinone). Add MBS5050), 0.1% of a mildew inhibitor (a mixture of benzimidazole carbamate and 3-iodo(o)-2-propynyl-carbamate butyl ester, a mildew inhibitor ACTICIDE LPC 3), and 0.15% of a defoamer (mineral oil F-210), and stir at medium speed (1000-1200 rpm) for 5 minutes.

[0064] I) Add 0.5% rheology modifier (polyurethane RM-2020), stir at medium speed (1000-1200 rpm) for 5 minutes to obtain the long-lasting antiviral inorganic coating.

[0065] The antiviral powder (TiO2-SiO2-CuFeO2) used in this embodiment is prepared by a physicochemical reaction of silica nano-TiO2 obtained by simultaneous coating of silica obtained by sol-gel method and CuFeO2 nano-particles obtained by sol-gel method.

[0066] Specifically, the antiviral powder is prepared through the following steps:

[0067] (1) In the precursor of silica, silane compounds (tetraethoxysilane-C8H) 20 In the sol-gel process for preparing silica, silane compounds have a large number of hydroxyl groups on their surface. Taking advantage of the reactivity of these hydroxyl groups, nano-sized TiO2 and CuFeO2 particles that can chemically react with the silanol groups on the gel surface are added. The hydroxyl reaction is carried out at 120℃-150℃ for 60 minutes (the appropriate coating thickness is obtained by controlling the reaction temperature and time). The resulting powder has a particle size of 1-15 μm; the mass ratio of silane compounds: nano-sized TiO2: nano-sized CuFeO2 is 10:1:9.

[0068] (2) The obtained powder is washed and separated with deionized water to remove unreacted compounds and impurities; then dried and vacuum impregnated to obtain TiO2-SiO2-CuFeO2 antiviral powder.

[0069] Nano-sized TiO2 is produced by a gas-phase method: titanium source is oxidized into titanium dioxide vapor at high temperature, and nano-sized titanium dioxide is formed through a gas-phase reaction. Evonik - Industrial-grade vapor-phase titanium dioxide (Aeroxide TiO2) P25, particle size: 20-25nm, supplier: Shanghai Zhenlishi Network Technology Co., Ltd.

[0070] Nanoscale CuFeO2 particles are prepared by the sol-gel method: potassium hydroxide and sodium hydroxide are added to a Teflon plastic container at a molar ratio of 0.8:1 to 1:1.2, followed by copper and iron salts (copper to iron atomic ratio 1:1), and then oxalate. The mixture is stirred thoroughly with a glass rod and then placed in a constant temperature oven at 190–220°C for 6–12 hours. After washing and drying, CuFeO2 nanostructures (300-600 nm) are obtained. The copper salt is one or a combination of copper chloride, copper nitrate, and copper acetate. The iron salt is one or a combination of ferric chloride, ferrous chloride, ferric nitrate, and ferric p-toluenesulfonate. The oxalate is one or a combination of sodium oxalate and potassium oxalate. These can be purchased from the supplier: Hefei Cuili New Material Technology Co., Ltd.

[0071] The basic performance of the product in this embodiment meets the requirements of JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings":

[0072]

[0073] In terms of environmental protection, it meets the requirements of HJ 2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings":

[0074] 1. Non-volatile organic compound (VOC) content (g / L): Not detected;

[0075] 2. Free formaldehyde content (mg / kg): Not detected;

[0076] 3. Total of benzene, toluene, ethylbenzene, and xylene: Not detected;

[0077] 4. Soluble heavy metals: Not detected;

[0078] Functionally, it meets the requirements of T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings":

[0079] 1. Antibacterial properties

[0080]

[0081] Test method: Test method for antibacterial performance in HGT3950-2007 "Antibacterial Coatings"

[0082] 2. Anti-mold properties

[0083]

[0084] Test method: Test method for antifungal performance in HGT3950-2007 "Antibacterial Coatings"

[0085] 3. Antiviral properties

[0086]

[0087] Test method: The test method in T / CNCIA03002-2020 "Test Method for Antiviral Performance of Coatings (Paint Films)"

[0088] Example 2:

[0089] Preparation steps of the product of this invention (all percentages are by weight):

[0090] A) Add 47.2% pure water to the stirred tank, and add 0.15% hydroxyethyl cellulose (250HBR) and 0.1% multifunctional additive (neutralizer VANTEX-T) while stirring at low speed (500-800 rpm);

[0091] B) After the cellulose is completely dissolved, add 0.6% dispersant (Dow Dispersant 1288), 0.15% wetting agent (ZETASPERSE 179), and 0.15% defoamer (mineral oil F-1860). Stir and disperse at room temperature and medium speed (1000-1200 rpm) for 15 minutes.

[0092] C) Add 1.0% antiviral powder (antiviral powder (TiO2-SiO2-CuFeO2), same as in Example 1), 4.0% titanium dioxide (rutile titanium dioxide 996), and 20.0% conventional filler (10.0% calcined kaolin and 10.0% 700 mesh calcium carbonate), and stir at high speed (1500-1800 rpm) for 20 minutes until the fineness is qualified (≤50 μm);

[0093] D) After stopping stirring, add 12.0% silica sol solution (Kehan's silica sol solution KHZCM-30) and stir at medium speed (1000-1200 rpm) for 5 minutes;

[0094] E) After stopping stirring, add 10.0% potassium silicate solution (Sipusen Chemical's nano-modified potassium silicate KS33) and stir at medium speed (1000-1200 rpm) for 10 minutes.

[0095] F) Add 0.8% of the hydrophilic chain extender N-hydroxydiethanolamine while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0096] G) Add 3.0% of antiviral agent (zeolite silver-loaded agent) while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0097] H) Add 0.08% of a bactericide and preservative (isothiazolinone). LPC5), 0.12% bactericide and preservative (a mixture of isothiazolinone and benzisothiazolinone). Mix 0.15% of MBS5050, 0.15% of a fungicide (a mixture of benzimidazole carbamate and 3-iodo(o)-2-propynyl-carbamate butyl ester, a fungicide ACTICIDE LPC3), and 0.1% of a defoamer (mineral oil F-210) at medium speed (1000-1200 rpm) for 5 minutes.

[0098] I) Add 0.4% rheology modifier (polyurethane RM-2020), stir at medium speed (1000-1200 rpm) for 5 minutes to obtain the long-lasting antiviral inorganic coating.

[0099] The basic performance of the product in this embodiment meets the requirements of JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings":

[0100]

[0101] In terms of environmental protection, it meets the requirements of HJ 2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings":

[0102] 1. Non-volatile organic compound (VOC) content (g / L): Not detected;

[0103] 2. Free formaldehyde content (mg / kg): Not detected;

[0104] 3. Total of benzene, toluene, ethylbenzene, and xylene: Not detected;

[0105] 4. Soluble heavy metals: Not detected;

[0106] Functionally, it meets the requirements of T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings":

[0107] 1. Antibacterial properties

[0108]

[0109] Test method: Test method for antibacterial performance in HGT3950-2007 "Antibacterial Coatings"

[0110] 2. Anti-mold properties

[0111]

[0112] Test method: Test method for antifungal performance in HGT3950-2007 "Antibacterial Coatings"

[0113] 3. Antiviral properties

[0114]

[0115] Test method: The test method in T / CNCIA03002-2020 "Test Method for Antiviral Performance of Coatings (Paint Films)"

[0116] Example 3:

[0117] Preparation steps of the product of this invention (all percentages are by weight):

[0118] A) Add 46.65% pure water to the reactor, and add 0.2% hydroxyethyl cellulose (250HBR) and 0.2% multifunctional auxiliaries (neutralizing agent VANTEX-T) while stirring at low speed (500-800 rpm).

[0119] B) After the cellulose is completely dissolved, add 0.7% dispersant (Dow Dispersant 1288), 0.2% wetting agent (ZETASPERSE 179), and 0.2% defoamer (mineral oil F-1860). Stir and disperse at room temperature and medium speed (1000-1200 rpm) for 15 minutes.

[0120] C) Add 2.0% antiviral powder (antiviral powder (TiO2-SiO2-CuFeO2), same as in Example 1), 5.0% titanium dioxide (rutile titanium dioxide 996), and 18.0% conventional filler (8.0% calcined kaolin and 10.0% 700 mesh calcium carbonate), and stir at high speed (1500-1800 rpm) for 20 minutes until the fineness is qualified (≤50 μm);

[0121] D) After stopping stirring, add 15.0% silica sol solution (Kehan's silica sol solution KHZCM-30) and stir at medium speed (1000-1200 rpm) for 5 minutes;

[0122] E) After stopping stirring, add 8.0% potassium silicate solution (Sipusen Chemical's nano-modified potassium silicate KS33) and stir at medium speed (1000-1200 rpm) for 10 minutes;

[0123] F) Add 1.0% of the hydrophilic chain extender N-hydroxydiethanolamine while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0124] G) Add 2.0% of antiviral agent (zeolite silver-loaded agent) while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0125] H) Add 0.1% of a bactericide and preservative (isothiazolinone). LPC5), 0.15% bactericide and preservative (a mixture of isothiazolinone and benzisothiazolinone) Mix 0.2% of MBS5050 (a mixture of benzimidazole carbamate and 3-iodo(o)-2-propynyl-carbamate butyl ester, a type of fungicide, ACTICIDE LPC 3) and 0.1% of defoamer (mineral oil F-210) at medium speed (1000-1200 rpm) for 5 minutes;

[0126] I) Add 0.3% rheology modifier (polyurethane RM-2020), stir at medium speed (1000-1200 rpm) for 5 minutes to obtain the long-lasting antiviral inorganic coating.

[0127] The basic performance of the product in this embodiment meets the requirements of JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings":

[0128]

[0129] In terms of environmental protection, it meets the requirements of HJ 2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings":

[0130] 1. Non-volatile organic compound (VOC) content (g / L): Not detected;

[0131] 2. Free formaldehyde content (mg / kg): Not detected;

[0132] 3. Total of benzene, toluene, ethylbenzene, and xylene: Not detected;

[0133] 4. Soluble heavy metals: Not detected;

[0134] Functionally, it meets the requirements of T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings":

[0135] 1. Antibacterial properties

[0136]

[0137] Test method: Test method for antibacterial performance in HGT3950-2007 "Antibacterial Coatings"

[0138] 2. Anti-mold properties

[0139]

[0140] Test method: Test method for antifungal performance in HGT3950-2007 "Antibacterial Coatings"

[0141] 3. Antiviral properties

[0142]

[0143] Test method: The test method in T / CNCIA03002-2020 "Test Method for Antiviral Performance of Coatings (Paint Films)"

[0144] Comparative Example 1: (The antiviral powder used in the formulation system was an antiviral material that was not encapsulated in silica aerogel)

[0145] A) Add 49.04% pure water to a stirred tank, and add 0.18% hydroxyethyl cellulose (250HBR) and 0.15% multifunctional additive (neutralizing agent VANTEX-T) while stirring at low speed (500-800 rpm).

[0146] B) After the cellulose is completely dissolved, add 0.8% dispersant (Dow Dispersant 1288), 0.1% wetting agent (ZETASPERSE 179), and 0.1% defoamer (mineral oil F-1860). Stir and disperse at room temperature at medium speed (1000-1200 rpm) for 15 minutes.

[0147] C) Add 0.25% antiviral powder (modified nano-TiO2 and nano-CuFeO2 particles in a mass ratio of 1:9), 3.0% titanium dioxide (rutile titanium dioxide 996), and 25.0% conventional filler (15.0% calcined kaolin and 10.0% 700-mesh calcium carbonate), and stir at high speed (1500-1800 rpm) for 20 minutes until the fineness is qualified (≤50μm);

[0148] D) After stopping stirring, add 10.0% silica sol solution (Kehan's silica sol solution KHZCM-30) and stir at medium speed (1000-1200 rpm) for 5 minutes;

[0149] E) After stopping stirring, add 5.0% potassium silicate solution (Sipusen Chemical's nano-modified potassium silicate KS33) and stir at medium speed (1000-1200 rpm) for 10 minutes;

[0150] F) Add 0.5% of the hydrophilic chain extender N-hydroxydiethanolamine while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0151] G) Add 5.0% of antiviral agent (zeolite silver-loaded agent) while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0152] H) Add 0.05% of a bactericide and preservative (isothiazolinone). LPC5), 0.08% bactericide and preservative (a mixture of isothiazolinone and benzisothiazolinone). Add MBS5050), 0.1% of a mildew inhibitor (a mixture of benzimidazole carbamate and 3-iodo(o)-2-propynyl-carbamate butyl ester, a mildew inhibitor ACTICIDE LPC 3), and 0.15% of a defoamer (mineral oil F-210), and stir at medium speed (1000-1200 rpm) for 5 minutes.

[0153] I) Add 0.5% rheology modifier (polyurethane RM-2020), stir at medium speed (1000-1200 rpm) for 5 minutes to obtain the long-lasting antiviral inorganic coating.

[0154] The basic performance of this comparative product meets the requirements of JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings":

[0155]

[0156] Conventional performance (thermal storage stability (7d)): clumping and flocculation.

[0157] In terms of environmental protection, it meets the requirements of HJ 2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings":

[0158] 1. Non-volatile organic compound (VOC) content (g / L): Not detected;

[0159] 2. Free formaldehyde content (mg / kg): Not detected;

[0160] 3. Total of benzene, toluene, ethylbenzene, and xylene: Not detected;

[0161] 4. Soluble heavy metals: Not detected;

[0162] In terms of environmental performance, it is comparable.

[0163] Functionally, it meets the requirements of T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings":

[0164] 1. Antibacterial properties

[0165]

[0166] Test method: Test method for antibacterial performance in HGT3950-2007 "Antibacterial Coatings"

[0167] 2. Anti-mold properties

[0168]

[0169] Test method: Test method for antifungal performance in HGT3950-2007 "Antibacterial Coatings"

[0170] 3. Antiviral properties

[0171]

[0172] Test method: The test method in T / CNCIA03002-2020 "Test Method for Antiviral Performance of Coatings (Paint Films)"

[0173] In comparison with its functional performance: 1. Its anti-mold durability does not meet the mold growth grade I;

[0174] 2. Its antiviral performance only meets the Level II antiviral rate standard;

[0175] 3. The antiviral durability performance does not meet the antiviral rate level II.

[0176] Comparative Example 2: (The antiviral powder in the formulation system is calcined porous diatomaceous earth)

[0177] A) Add 53.79% pure water to the reactor, and add 0.18% hydroxyethyl cellulose (250HBR) and 0.15% multifunctional auxiliaries (neutralizing agent VANTEX-T) while stirring at low speed (500-800 rpm).

[0178] B) After the cellulose is completely dissolved, add 0.8% dispersant (Dow Dispersant 1288), 0.1% wetting agent (ZETASPERSE 179), and 0.1% defoamer (mineral oil F-1860). Stir and disperse at room temperature at medium speed (1000-1200 rpm) for 15 minutes.

[0179] C) Add 0.5% antiviral powder (calcined porous diatomaceous earth), 3.0% titanium dioxide (rutile titanium dioxide 996), and 25.0% conventional filler (15.0% calcined kaolin and 10.0% 700-mesh calcium carbonate), and stir at high speed (1500-1800 rpm) for 20 minutes until the fineness is qualified (≤50um);

[0180] D) After stopping stirring, add 10.0% silica sol solution (Kehan's silica sol solution KHZCM-30) and stir at medium speed (1000-1200 rpm) for 5 minutes;

[0181] E) After stopping stirring, add 5.0% potassium silicate solution (Sipusen Chemical's nano-modified potassium silicate KS33) and stir at medium speed (1000-1200 rpm) for 10 minutes;

[0182] F) Add 0.5% of the hydrophilic chain extender N-hydroxydiethanolamine while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0183] G) Add 0.05% of a bactericide and preservative (isothiazolinone). LPC5), 0.08% bactericide and preservative (a mixture of isothiazolinone and benzisothiazolinone). Add MBS5050), 0.1% of a mildew inhibitor (a mixture of benzimidazole carbamate and 3-iodo(o)-2-propynyl-carbamate butyl ester, a mildew inhibitor ACTICIDE LPC 3), and 0.15% of a defoamer (mineral oil F-210), and stir at medium speed (1000-1200 rpm) for 5 minutes.

[0184] H) Add 0.5% rheology modifier (polyurethane RM-2020), stir at medium speed (1000-1200 rpm) for 5 minutes to obtain the long-lasting antiviral inorganic coating.

[0185] The basic performance of this comparative product meets the requirements of JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings":

[0186]

[0187] Conventional performance (thermal storage stability (7d)): clumping and flocculation.

[0188] In terms of environmental protection, it meets the requirements of HJ 2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings":

[0189] 1. Non-volatile organic compound (VOC) content (g / L): Not detected;

[0190] 2. Free formaldehyde content (mg / kg): Not detected;

[0191] 3. Total of benzene, toluene, ethylbenzene, and xylene: Not detected;

[0192] 4. Soluble heavy metals: Not detected;

[0193] In terms of environmental performance, it is comparable.

[0194] Functionally, it meets the requirements of T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings":

[0195] 1. Antibacterial properties

[0196]

[0197] Test method: Test method for antibacterial performance in HGT3950-2007 "Antibacterial Coatings"

[0198] 2. Anti-mold properties

[0199]

[0200] Test method: Test method for antifungal performance in HGT3950-2007 "Antibacterial Coatings"

[0201] 3. Antiviral properties

[0202]

[0203] Test method: The test method in T / CNCIA03002-2020 "Test Method for Antiviral Performance of Coatings (Paint Films)"

[0204] In terms of functionality and performance, 1. its antibacterial performance only meets Level II;

[0205] 2. Its antifungal performance only meets Level II standards;

[0206] 3. Its antiviral performance only meets Level II standards;

[0207] Comparative Example 3: (Antiviral powder was not used in the formulation system; only antiviral adjuvants were used)

[0208] A) Add 49.29% pure water to the stirred tank, and add 0.18% hydroxyethyl cellulose (250HBR) and 0.15% multifunctional additive (neutralizer VANTEX-T) while stirring at low speed (500-800 rpm).

[0209] B) After the cellulose is completely dissolved, add 0.8% dispersant (Dow Dispersant 1288), 0.1% wetting agent (ZETASPERSE 179), and 0.1% defoamer (mineral oil F-1860). Stir and disperse at room temperature at medium speed (1000-1200 rpm) for 15 minutes.

[0210] C) Add 3.0% titanium dioxide (rutile titanium dioxide 996) and 25.0% conventional filler (15.0% calcined kaolin and 10.0% 700 mesh calcium carbonate), stir at high speed (1500-1800 rpm) for 20 minutes until the fineness is qualified (≤50um);

[0211] D) After stopping stirring, add 10.0% silica sol solution (Kehan's silica sol solution KHZCM-30) and stir at medium speed (1000-1200 rpm) for 5 minutes;

[0212] E) After stopping stirring, add 5.0% potassium silicate solution (Sipusen Chemical's nano-modified potassium silicate KS33), and stir at medium speed (1000-1200 rpm) for 10 minutes.

[0213] F) Add 0.5% of the hydrophilic chain extender N-hydroxydiethanolamine while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0214] G) Add 5.0% of antiviral agent (zeolite silver-loaded agent) while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0215] H) Add 0.05% of a bactericide and preservative (isothiazolinone). LPC5), 0.08% bactericide and preservative (a mixture of isothiazolinone and benzisothiazolinone). Add MBS5050), 0.1% of a mildew inhibitor (a mixture of benzimidazole carbamate and 3-iodo(o)-2-propynyl-carbamate butyl ester, a mildew inhibitor ACTICIDE LPC 3), and 0.15% of a defoamer (mineral oil F-210), and stir at medium speed (1000-1200 rpm) for 5 minutes.

[0216] I) Add 0.5% rheology modifier (polyurethane RM-2020), stir at medium speed (1000-1200 rpm) for 5 minutes to obtain the long-lasting antiviral inorganic coating.

[0217] The basic performance of this comparative product meets the requirements of JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings":

[0218]

[0219] In terms of environmental protection, it meets the requirements of HJ 2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings":

[0220] 1. Non-volatile organic compound (VOC) content (g / L): Not detected;

[0221] 2. Free formaldehyde content (mg / kg): Not detected;

[0222] 3. Total of benzene, toluene, ethylbenzene, and xylene: Not detected;

[0223] 4. Soluble heavy metals: Not detected;

[0224] In terms of environmental performance, it is comparable.

[0225] Functionally, it meets the requirements of T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings":

[0226] 1. Antibacterial properties

[0227]

[0228] Test method: Test method for antibacterial performance in HGT3950-2007 "Antibacterial Coatings"

[0229] 2. Anti-mold properties

[0230]

[0231] Test method: Test method for antifungal performance in HGT3950-2007 "Antibacterial Coatings"

[0232] 3. Antiviral properties

[0233]

[0234] Test method: The test method in T / CNCIA03002-2020 "Test Method for Antiviral Performance of Coatings (Paint Films)"

[0235] In terms of functionality and performance, 1. its antibacterial performance only meets Level II;

[0236] 2. Its antifungal performance only meets Level II standards;

[0237] 3. Its antiviral performance only meets Level II standards;

[0238] Comparative Example 4: (Only antiviral powder was used in the formulation system, without antiviral adjuvants)

[0239] A) Add 53.79% pure water to the reactor, and add 0.18% hydroxyethyl cellulose (250HBR) and 0.15% multifunctional auxiliaries (neutralizing agent VANTEX-T) while stirring at low speed (500-800 rpm).

[0240] B) After the cellulose is completely dissolved, add 0.8% dispersant (Dow Dispersant 1288), 0.1% wetting agent (ZETASPERSE 179), and 0.1% defoamer (mineral oil F-1860). Stir and disperse at room temperature at medium speed (1000-1200 rpm) for 15 minutes.

[0241] C) Add 0.5% antiviral powder (antiviral powder (TiO2-SiO2-CuFeO2), same as in Example 1), 3.0% titanium dioxide (rutile titanium dioxide 996), and 25.0% conventional filler (15.0% calcined kaolin and 10.0% 700 mesh calcium carbonate), and stir at high speed (1500-1800 rpm) for 20 minutes until the fineness is qualified (≤50 μm);

[0242] D) After stopping stirring, add 10.0% silica sol solution (Kehan's silica sol solution KHZCM-30) and stir at medium speed (1000-1200 rpm) for 5 minutes;

[0243] E) After stopping stirring, add 5.0% potassium silicate solution (Sipusen Chemical's nano-modified potassium silicate KS33) and stir at medium speed (1000-1200 rpm) for 10 minutes;

[0244] F) Add 0.5% of the hydrophilic chain extender N-hydroxydiethanolamine while stirring, and stir at medium speed (1000-1200 rpm) for 2 minutes;

[0245] G) Add 0.05% of a bactericide and preservative (isothiazolinone). LPC5), 0.08% bactericide and preservative (a mixture of isothiazolinone and benzisothiazolinone). Add MBS5050), 0.1% of a mildew inhibitor (a mixture of benzimidazole carbamate and 3-iodo(o)-2-propynyl-carbamate butyl ester, a mildew inhibitor ACTICIDE LPC 3), and 0.15% of a defoamer (mineral oil F-210), and stir at medium speed (1000-1200 rpm) for 5 minutes.

[0246] H) Add 0.5% rheology modifier (polyurethane RM-2020), stir at medium speed (1000-1200 rpm) for 5 minutes to obtain the long-lasting antiviral inorganic coating.

[0247] The basic performance of this comparative product meets the requirements of JG / T26 "Liquid Inorganic Coatings for Interior and Exterior Walls of Buildings":

[0248]

[0249] In terms of environmental protection, it meets the requirements of HJ 2537-2022 "Technical Requirements for Environmental Labeling Products - Waterborne Coatings":

[0250] 1. Non-volatile organic compound (VOC) content (g / L): Not detected;

[0251] 2. Free formaldehyde content (mg / kg): Not detected;

[0252] 3. Total of benzene, toluene, ethylbenzene, and xylene: Not detected;

[0253] 4. Soluble heavy metals: Not detected;

[0254] In terms of environmental performance, it is comparable.

[0255] Functionally, it meets the requirements of T / CNCIA 01014-2020 "Antibacterial and Antiviral Coatings":

[0256] 1. Antibacterial properties

[0257]

[0258] Test method: Test method for antibacterial performance in HGT3950-2007 "Antibacterial Coatings"

[0259] 2. Anti-mold properties

[0260]

[0261] Test method: Test method for antifungal performance in HGT3950-2007 "Antibacterial Coatings"

[0262] 3. Antiviral properties

[0263]

[0264] Test method: The test method in T / CNCIA03002-2020 "Test Method for Antiviral Performance of Coatings (Paint Films)"

[0265] In terms of functionality and performance, 1. its antibacterial performance only meets Level II;

[0266] 2. Its antifungal performance only meets Level II standards;

[0267] 3. Its antiviral performance only meets Level II.

[0268] In the coating system, the antiviral powder (modified nano-TiO2 and nano-CuFeO2 particles, without antiviral material encapsulated in silica aerogel) is unstable in the coating system, and the resulting coating exhibits agglomeration in its "thermal storage stability 7 days" (as shown in Comparative Example 1). Moreover, its antifungal and antiviral properties only meet Level II.

[0269] Calcined porous diatomaceous earth is commonly added to coatings in the market to achieve bactericidal and antiviral effects through its adsorption properties. As shown in Comparative Example 2, the addition of calcined porous diatomaceous earth results in instability in the coating system, and the resulting coating exhibits agglomeration during its 7-day thermal storage stability. Furthermore, its antibacterial, antifungal, and antiviral properties only meet Level II standards.

[0270] Comparative Example 3 showed stable performance in coatings with the addition of zeolite-loaded silver antiviral additives, but its antibacterial, antifungal, and antiviral properties only met the Class II standard.

[0271] Comparative Example 4: Functional powder was prepared by simply adding silica aerogel to encapsulate well-dispersed modified nano-TiO2 and nano-CuFeO2 particles, but its antibacterial, antifungal, and antiviral properties only met the Level II standard.

[0272] Example 1 uses silica aerogel to encapsulate well-dispersed modified nano-TiO2 and nano-CuFeO2 particles to prepare functional powder and zeolite silver-loaded antiviral additive. The zeolite silver-loaded antiviral additive is effectively used in combination with the antiviral powder to achieve a synergistic effect. The antibacterial, antifungal, and antiviral properties reach level I, and the paint film has strong antiviral properties and antiviral durability.

[0273] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A long-lasting antiviral coating, characterized in that, Includes the following components by mass percentage: ED grade pure water 45%–50%; Thickener 0.1%–0.2%; Multifunctional additives: 0.1%–0.2%; Dispersant 0.6%–0.8%; Defoamer 0.2%–0.3%; Wetting agent 0.1%–0.2%; Antiviral powder 0.5%–2.0%; Titanium dioxide 3.0%–5.0%; Filler content: 15%–25%; Silica sol solution 10%–15%; Potassium silicate solution 5.0%–10%; N-hydroxydiethanolamine 0.5%–1.0%; Antiviral adjuvant 2.0%–5.0%; Bactericide and preservative: 0.1%–0.5%; Mildew inhibitor 0.1%–0.5%; Rheology modifier 0.1%–0.5%; The antiviral powder is a functional powder prepared by encapsulating well-dispersed antiviral materials with silica aerogel; the antiviral material is modified nano-TiO2 and nano-CuFeO2 particles; the antiviral adjuvant is a zeolite-loaded silver antiviral adjuvant. The antiviral powder is prepared through the following steps: (1) In the process of preparing silica by sol-gel method using silane compounds, solvents and catalysts as precursors of silica, nano-sized TiO2 and nano-sized CuFeO2 particles that can chemically react with silanol groups on the gel surface are added. The hydroxyl reaction is carried out between 120℃ and 150℃. By controlling the reaction temperature and time, a suitable coating layer thickness is obtained, and the resulting powder has a particle size of 1-15 μm. The mass ratio of silane compounds: nano-sized TiO2: nano-sized CuFeO2 is 10:1:

9. (2) The obtained powder is washed and separated with deionized water to remove unreacted compounds and impurities; then dried and vacuum impregnated to obtain TiO2-SiO2-CuFeO2 antiviral powder.

2. The long-lasting antiviral coating according to claim 1, characterized in that, The silica sol solution is Kehan's silica sol solution KHZCM-30; the potassium silicate solution is Xipusen Chemical's nano-modified potassium silicate KS33; the bond between the silica sol and potassium silicate is a molecular-level chemical bond -Si-O-Si-, the nano-modified potassium silicate liquid is dispersed and wrapped between silica sol colloidal particles with an average particle size of 10-20nm, the strong alkalinity of potassium silicate allows for a certain depth of fusion penetration into the surface of the silica sol colloidal particles SiO2, and then condensation polymerization occurs to solidify into a film.

3. The long-lasting antiviral coating according to claim 1, characterized in that, The silane compound is tetraethoxysilane; the solvent is deionized water; the catalyst is a pH adjuster, which adjusts the pH of the reaction system to 5-6; the nano-sized TiO2 is nano-TiO2 obtained by gas-phase method; the nano-sized CuFeO2 particles are nano-CuFeO2 obtained by sol-gel method.

4. The long-lasting antiviral coating according to claim 1, characterized in that, The zeolite-loaded silver antiviral adjuvant is prepared by loading silver ions with the strongest antiviral activity onto zeolite through physical adsorption and ion exchange.

5. The long-lasting antiviral coating according to claim 1, characterized in that, The pH value of the coating is 11.0-11.

5.

6. The long-lasting antiviral coating according to claim 1, characterized in that, The thickener is hydroxyethyl cellulose; the multifunctional additive is a pH adjuster; the dispersant is sodium polyacrylate; the defoamer is a mineral oil defoamer; the wetting agent is a nonionic surfactant; the titanium dioxide is rutile titanium dioxide; the filler is 700-mesh heavy calcium carbonate and calcined kaolin; the bactericide and preservative is isothiazolinone CIT+MIT bactericide and benzisothiazolinone BIT bactericide; the fungicide is isothiazolinone fungicide; and the rheology modifier is polyurethane.

7. The method for preparing the long-lasting antiviral coating according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Add pure water, thickener, and multifunctional additive to the reactor and stir at low speed for 15-20 minutes until the thickener is completely swollen; (2) Add dispersant, wetting agent, and part of the defoamer, and stir at medium speed for 10-20 minutes; (3) Add antiviral powder and stir at high speed for 1-2 minutes until well mixed; (4) Add titanium dioxide and filler, stir at high speed for 15-20 minutes until the fineness is ≤50um; (5) Add silica sol solution and stir at medium speed for 3-5 minutes; (6) Add potassium silicate solution and stir at medium speed for 5-10 minutes; (7) Add the hydrophilic chain extender N-hydroxydiethanolamine and stir at medium speed for 1-2 minutes; (8) Add antiviral adjuvant and stir at medium speed for 1-2 minutes; (9) Add bactericide, preservative, mildew inhibitor and the remaining defoamer, and stir at medium speed for 3-5 minutes; (10) Add rheology modifier and stir at medium speed for 3-5 minutes to obtain the finished product.

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