Inorganic multifunctional healthy coating

Abstract

The invention discloses an inorganic multifunctional healthy coating which comprises the following raw materials in percentage by mass: 32% of 1250-mesh calcium hydroxide powder, 2% of titanium dioxide, 5% of a water-based inorganic cross-linking agent, 3% of negative ion powder, 3% of a unit sterilizing agent, 2% of a polycarboxylate dispersing agent, 1.5% of a nonionic wetting agent, 0.5% of an organic silicon defoaming agent and 60% of deionized water. The preparation method comprises the following steps: step-by-step speed-controlled stirring, standing for defoaming, filtering and packaging. The coating realizes zero formaldehyde and zero TVOC emission, and the formaldehyde removal rate reaches 96%; the antibacterial rate on escherichia coli, staphylococcus aureus and the like is larger than or equal to 99%, the inactivation rate on enterovirus 71, hand-foot-mouth virus vero and influenza A virus H3N2 is larger than or equal to 99%, the negative oxygen ion concentration is larger than or equal to 15000 / cm < 3 >, and the antibacterial and mildew-proof anti-pollution scrubbing-resistant functions are achieved. The adhesive force reaches grade 1, the scrubbing resistance is more than or equal to 5000 times, the defects of the traditional inorganic coating are improved, the construction is convenient, the large-scale production can be realized, the coating is adaptive to multiple scenes such as home furnishing, medical treatment and schools, and the coating industry is promoted to be integrally upgraded to environmental protection, health and practicability.

Description

Technical Field

[0001] This invention relates to the field of architectural coatings technology, specifically to an inorganic multifunctional healthy coating, which is particularly suitable for interior decoration scenarios with stringent requirements for environmental protection standards, health protection, and practical performance, such as homes, medical facilities, offices, schools, and infant care facilities. It falls under the category of cross-innovation technology of green building materials and healthy functional materials. Background Technology

[0002] With increasing health awareness and tightening policies on green building materials, indoor air quality has become a core focus of public concern. Traditional organic coatings, relying on synthetic resins and organic solvents, inevitably emit harmful substances such as VOCs (volatile organic compounds), formaldehyde, and benzene compounds. Long-term volatilization of these substances can cause respiratory diseases, allergic reactions, and even increase the risk of cancer, seriously threatening human respiratory health. Although some companies have launched "low-VOC coatings," achieving zero emissions of harmful substances remains difficult, and formaldehyde removal rates are generally below 70%, failing to meet the high-level demands for indoor environmental protection. Furthermore, traditional coatings have limited functionality, mostly providing only decoration and basic protection. Special scenarios such as medical facilities and infant spaces urgently require healthy coatings that combine antibacterial, antiviral, and antifungal properties. Existing products often only offer single antibacterial functions, with short-lasting antibacterial effects and a narrow antibacterial spectrum, lacking effective inhibition against fungi such as Candida albicans and pathogenic viruses such as enterovirus 71, hand-foot-and-mouth disease virus Vero, and influenza A virus H3N2.

[0003] On the other hand, while existing inorganic coatings, based on inorganic substrates such as cement and lime, have the advantages of being environmentally friendly and odorless, they have long faced technical bottlenecks:

[0004] Firstly, it has weak adhesion and insufficient bonding strength with common wall substrates such as concrete and gypsum board, making it prone to peeling and detachment.

[0005] Secondly, the construction is difficult, the coating has poor leveling properties and is prone to cracking, and the requirements for the temperature and humidity of the construction environment are strict.

[0006] Third, it lacks durability, with a typical number of scrub cycles below 500, which cannot meet the maintenance needs of high-frequency usage scenarios.

[0007] Furthermore, the industry faces common challenges such as the difficulty in balancing environmental protection and performance, weak functional sustainability, and high costs associated with large-scale production. While some high-end health coatings can achieve multi-functional integration, their reliance on imported raw materials or complex processes keeps prices high, hindering widespread adoption. Low-cost products, on the other hand, suffer from rapid functional degradation and failure to meet environmental standards. Currently, national standards such as the "Green Building Evaluation Standard" (GB / T 50378-2019) and the "Limits of Hazardous Substances in Interior Wall Coatings for Interior Decoration and Renovation Materials" (GB 18582-2020) are constantly being raised. Traditional coatings can no longer meet policy requirements and market demands. There is an urgent need to develop a new type of inorganic coating that combines zero pollution emissions, broad-spectrum health protection, excellent practical performance, and large-scale production capabilities to overcome the industry's development bottlenecks. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an inorganic multifunctional health coating. Through the scientific formulation of inorganic substrates and functional components, combined with an optimized preparation process, it achieves a four-in-one technological breakthrough of "environmentally friendly zero emissions, healthy multifunctionality, practical high performance, and industrial scalability", thus solving many defects of traditional coatings.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An inorganic multifunctional health coating, the raw materials of which include, by weight percentage:

[0011] The composition includes 32% calcium hydroxide powder (1250 mesh), 2% titanium dioxide, 5% crosslinking agent, 3% negative ion powder, 3% unit sterilizing agent, 2% dispersant, 1.5% wetting agent, 0.5% defoamer, and 60% water. The purity of the calcium hydroxide powder is not less than 95%. The crosslinking agent is an aqueous inorganic crosslinking agent, the dispersant is a polycarboxylate dispersant, the wetting agent is a nonionic wetting agent, and the defoamer is an organosilicon defoamer.

[0012] Furthermore, the titanium dioxide is rutile titanium dioxide with a particle size of no more than 1 micrometer; the negative ion powder is natural mineral negative ion powder; and the unit sterilizing agent is an inorganic composite unit sterilizing agent.

[0013] Furthermore, its preparation method includes the following steps:

[0014] (1) Dispersion of additives: Add 50% of the formula amount of deionized water, start the mixer, add dispersant, wetting agent and defoamer, control the speed to 500-800 rpm, stir for 5-10 minutes until the additives are completely dissolved to form a uniform system.

[0015] (2) Functional component compounding: Add 32% 1250 mesh calcium hydroxide powder, 2% titanium dioxide, 3% negative ion powder, 3% unit sterilizing agent, and 5% crosslinking agent. Adjust the speed of the mixer to 800-1000 rpm and continue stirring for 20-30 minutes until the material is free from agglomeration and sedimentation.

[0016] (3) Post-processing: Turn off the mixer and let the coating stand for 15-20 minutes to defoam naturally. After the foam is completely eliminated, filter it with a 100-300 mesh stainless steel filter to remove impurity particles and undispersed clumps. Collect the filtrate and put it into a sealed container to obtain the finished product.

[0017] Furthermore, the formaldehyde removal rate of the coating shall not be less than 96%, as tested according to the JC / T 1074-2008 standard.

[0018] Furthermore, the coating exhibits an antibacterial rate of no less than 99% against Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 6538, and an antibacterial rate of no less than 99% against Candida albicans ATCC 10231, as tested according to GB / T 21866-2008 standard.

[0019] Furthermore, the coating exhibits a virus inactivation rate of no less than 99% against enterovirus 71 (EV71), hand-foot-and-mouth disease virus (Vero), and influenza A virus (H3N2), as tested according to GB / T 30979-2014 standard.

[0020] Furthermore, the concentration of negative oxygen ions released by the coating during use is no less than 15,000 ions / cm³. 3 Tested according to JC / T2040-2010 standard.

[0021] Furthermore, the coating adhesion is rated as Grade 1, tested using the cross-cut test method, in accordance with GB / T 9286-1998 standard; the scrub resistance is not less than 3000 cycles, tested in accordance with GB / T 9756-2018 standard; and the stain resistance is rated as Grade 1, tested in accordance with GB / T 9756-2018 standard.

[0022] Furthermore, the formaldehyde content of the coating is less than 0.001g / kg and the TVOC content is less than 0.01g / L. According to the GB18582-2020 standard, it meets the additive-free environmental protection standard.

[0023] Furthermore, the coating's antibacterial and antifungal properties are rated at level 0, with a testing period of 28 days. According to the GB / T 1741-2020 standard, no microbial growth was observed during testing.

[0024] The beneficial effects of this invention are:

[0025] (1) Extreme environmental performance: This invention uses 1250 mesh calcium hydroxide powder as the core inorganic base material, combined with water-based additives and deionized water, to achieve zero formaldehyde, zero TVOC, and zero benzene emissions, which fully meets the "no additives" requirements in GB 18582-2020 standard; at the same time, through the synergistic effect of negative ion powder and calcium hydroxide, the formaldehyde removal rate is as high as 96%, far exceeding the industry average, completely overcoming the industry pain point of harmful substance emissions in traditional organic coatings, and providing a non-toxic and harmless breathing environment for indoor spaces;

[0026] (2) Broad-spectrum and potent health benefits: Integrating multiple health protection functions, verified by authoritative institutions, it achieves an antibacterial rate of ≥99% against Escherichia coli (ATCC 25922) and Staphylococcus aureus (ATCC 6538), and an antibacterial rate of ≥99% against Candida albicans (ATCC10231), achieving broad-spectrum antibacterial activity; it also achieves a virus inactivation rate of ≥99% against enterovirus 71 (EV71), hand-foot-and-mouth disease virus Vero, and influenza A virus H3N2, effectively blocking the spread of pathogenic microorganisms; simultaneously, it continuously releases negative oxygen ions (concentration ≥16300 ions / cm³). 3 It has antibacterial, anti-mildew, and odor-purifying functions, making it suitable for health protection needs in various scenarios such as home, medical, and school.

[0027] (3) Comprehensive optimization of practical performance: Through the optimization of the crosslinking agent and ultrafine calcium hydroxide powder formula, the adhesion between the coating and the wall substrate reaches Grade 1 (GB / T 9286-1998), solving the defects of peeling and flaking of traditional inorganic coatings; the leveling and thixotropic properties are optimized, no special tools are required during construction, and multiple methods such as roller coating, brush coating, and spraying can be used, and construction can be carried out in environments of 5-35℃, reducing the difficulty of construction; the scrub resistance is ≥3000 times (GB / T 9756-2018), the stain resistance reaches Grade 1, and it is not easy to yellow or crack after long-term use, taking into account both construction convenience and long-term stability;

[0028] (4) Economic and large-scale compatibility: The raw materials are all domestically available inorganic materials and environmentally friendly additives, avoiding reliance on imported ingredients; the preparation process does not require special conditions such as high temperature and high pressure, and can be carried out by conventional stirring equipment, which significantly reduces R&D and production costs; the formula has strong stability, and the performance fluctuation error is ≤3% during batch production, which can realize industrial large-scale production and meet the market demand.

[0029] (5) Industry technology-led upgrade: Breaking the bottleneck of existing healthy coatings that "environmental protection and performance cannot be achieved at the same time" and "single function and weak sustainability", we have constructed an innovative technology path of "inorganic substrate + multi-functional composite + process optimization". For the first time, we have achieved the integration of zero pollution emissions, broad-spectrum antibacterial and antiviral properties, and excellent practical performance, which promotes the transformation of the coating industry from "decorative" to "environmental protection + health + practicality" integrated functional type, and provides a new direction for the development of the green building materials industry. Detailed Implementation

[0030] The present invention will now be described in more detail and in a more complete manner.

[0031] This invention provides an inorganic multifunctional health coating, characterized in that: its raw materials are precisely proportioned according to mass percentage, and the synergistic effect of each component achieves multifunctional integration.

[0032] Core components of the substrate:

[0033] Calcium hydroxide powder (1250 mesh) 32%, high purity, ultra-fine particle size calcium hydroxide powder is selected as the main inorganic base material. Its 1250 mesh particle size design can increase the contact area between the coating and the wall substrate, enhance the bonding strength, and at the same time have excellent pH adjustment ability, providing an alkaline environment to support antibacterial and antiviral functions.

[0034] Functional enhancement components:

[0035] 2% titanium dioxide, selected as rutile titanium dioxide, combines light-blocking, stain-resistant, and chemical stability, enhancing the decorative effect and weather resistance of the coating; 5% crosslinking agent, using a water-based inorganic crosslinking agent to replace traditional organic crosslinking agents, improving coating adhesion and durability while preventing the release of harmful substances; 3% negative ion powder, using natural mineral negative ion powder, continuously releasing negative oxygen ions, degrading harmful gases in the air, and improving indoor air quality; 3% unit sterilizing agent, using an inorganic composite unit sterilizing agent, whose active ingredients can destroy the cell membrane and nucleic acid structure of bacteria and viruses, achieving broad-spectrum and long-lasting bactericidal and antiviral effects;

[0036] Processing aid components:

[0037] 2% dispersant, a polycarboxylate dispersant, effectively prevents raw material particle agglomeration and improves the stability of the coating system; 1.5% wetting agent, a non-ionic wetting agent, reduces the surface tension of the coating and improves leveling and ease of application; 0.5% defoamer, an organosilicon defoamer, quickly eliminates foam generated during preparation and avoids defects such as pinholes and bubbles after wall painting.

[0038] Solvent components:

[0039] Water accounts for 60% of the solvent, completely eliminating VOC emissions caused by organic solvents.

[0040] The preparation method employs a stepwise stirring and precise speed control process to ensure uniform dispersion and full reaction of each component. The specific steps are as follows:

[0041] Additive dispersion stage:

[0042] First, add 50% of the formula amount of deionized water to the mixing tank, start the high-speed mixer to ensure that the water is in a uniform flow state; then add 2% dispersant, 1.5% wetting agent and 0.5% defoamer, control the mixer speed to 500-800 rpm, and stir for 5-10 minutes to fully dissolve and disperse the additives in the water to form a stable additive system.

[0043] Functional component compounding stage:

[0044] Add 32% 1250 mesh calcium hydroxide powder, 2% titanium dioxide, 3% negative oxygen ion powder, 3% unit sterilizing agent, and 5% crosslinking agent to the additive system in sequence. Adjust the speed of the mixer to 800-1000 rpm and continue stirring for 20-30 minutes. This speed and time parameter can ensure that the functional components are evenly dispersed and form a strong chemical bond with the substrate components, avoiding the loss of functional components and performance degradation.

[0045] Post-processing stage:

[0046] After mixing, turn off the mixer and let the paint stand for 15-20 minutes to allow it to defoam naturally. Once the foam has completely disappeared, filter it using a 100-300 mesh filter to remove any impurities or undispersed lumps, ensuring the paint's fineness. Finally, pack it into sealed containers to obtain the finished product.

[0047] The present invention will be further described in detail below with reference to the embodiments. The raw materials used in the embodiments are all commercially available conventional products, and the testing methods are all based on national standards or industry-standard methods.

[0048] Example:

[0049] Weigh the raw materials precisely by mass percentage: 32 kg of calcium hydroxide powder (1250 mesh, purity ≥95%), 2 kg of rutile titanium dioxide (particle size ≤1μm), 5 kg of water-based inorganic crosslinking agent, 3 kg of natural mineral negative ion powder, 3 kg of inorganic composite unit sterilizing agent, 2 kg of polycarboxylate dispersant, 1.5 kg of nonionic wetting agent, 0.5 kg of organosilicon defoamer, and 60 kg of deionized water.

[0050] Preparation steps:

[0051] Additive dispersion: Add 500 kg of deionized water to a 1000 L stirred tank, start the mixer, adjust the speed to 600 rpm, add 20 kg of dispersant, 15 kg of wetting agent and 5 kg of defoamer in sequence, stir for 8 minutes, and observe that the solution is uniform and transparent with no obvious particles;

[0052] Functional component compounding: While maintaining stirring, add 1250 mesh 320kg calcium hydroxide powder, 20kg titanium dioxide, 30kg negative ion powder, 30kg unit sterilizing agent, and 50kg crosslinking agent in sequence. Increase the speed to 900 rpm and continue stirring for 25 minutes. Take samples every 5 minutes during this period to ensure that the materials do not agglomerate or precipitate.

[0053] Post-processing: Turn off the mixer, let stand for 18 minutes to defoam, filter with a 200-mesh stainless steel filter screen. No obvious residue was found during the filtration process. Collect the filtrate and put it into a sealed paint bucket to obtain the finished inorganic multifunctional health paint.

[0054] The finished product underwent comprehensive testing, and the results are shown in the table below. All indicators meet the design requirements and relevant standards.

[0055] Detection and Analysis Table

[0056]

[0057]

[0058] Summary of Test Results: The inorganic multifunctional health coating prepared by this invention has shown excellent performance in its core performance indicators under authoritative testing.

[0059] 1. Environmental protection indicators fully meet the standards, achieving zero formaldehyde and zero TVOC emissions, with a formaldehyde removal rate of up to 96%, far exceeding the industry's conventional level and meeting the highest standards for green building materials;

[0060] 2. It has outstanding health functions, with broad-spectrum antibacterial and antiviral capabilities. The inhibition / inactivation rate of common pathogenic bacteria and pathogenic viruses is ≥99%. At the same time, it can continuously release high concentrations of negative oxygen ions, and also has antibacterial, anti-mildew, and odor purification functions, comprehensively covering indoor health protection needs.

[0061] 3. Excellent practical performance, with adhesion, scrub resistance, stain resistance and other indicators all meeting or exceeding the superior product standard, solving the core defects of traditional inorganic coatings, and being easy to apply and stable in long-term use;

[0062] 4. All test results are based on clear standards and the data are authentic and reliable, fully verifying the scientific nature and feasibility of the technical solution of this invention, and providing solid performance support for the industrial application of the product.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An inorganic multifunctional health coating, characterized in that, The raw materials, by mass percentage, include: 32% calcium hydroxide powder (1250 mesh), 2% titanium dioxide, 5% crosslinking agent, 3% negative ion powder, 3% unit sterilizing agent, 2% dispersant, 1.5% wetting agent, 0.5% defoamer, and 60% water; the purity of the calcium hydroxide powder is not less than 95%, the crosslinking agent is an aqueous inorganic crosslinking agent, the dispersant is a polycarboxylate dispersant, the wetting agent is a nonionic wetting agent, and the defoamer is an organosilicon defoamer.

2. The inorganic multifunctional health coating according to claim 1, characterized in that: The titanium dioxide is rutile titanium dioxide with a particle size of no more than 1 micrometer; the negative ion powder is natural mineral negative ion powder; and the unit sterilizing agent is an inorganic composite unit sterilizing agent.

3. The inorganic multifunctional health coating according to claim 1, characterized in that, Its preparation method includes the following steps: (1) Dispersion of additives: Add 50% of the formula amount of deionized water, start the mixer, add dispersant, wetting agent and defoamer, control the speed to 500-800 rpm, stir for 5-10 minutes until the additives are completely dissolved to form a uniform system. (2) Functional component compounding: Add 32% 1250 mesh calcium hydroxide powder, 2% titanium dioxide, 3% negative ion powder, 3% unit sterilizing agent, and 5% crosslinking agent. Adjust the speed of the mixer to 800-1000 rpm and continue stirring for 20-30 minutes until the material is free from agglomeration and sedimentation. (3) Post-processing: Turn off the mixer and let the coating stand for 15-20 minutes to defoam naturally. After the foam is completely eliminated, filter it with a 100-300 mesh stainless steel filter to remove impurity particles and undispersed clumps. Collect the filtrate and put it into a sealed container to obtain the finished product.

4. An inorganic multifunctional health coating according to any one of claims 1-2, characterized in that: The formaldehyde removal rate of the coating shall not be less than 96%, and shall be tested in accordance with the JC / T 1074-2008 standard.

5. An inorganic multifunctional health coating according to any one of claims 1-2, characterized in that: The coating has an antibacterial rate of not less than 99% against Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 6538, and an antibacterial rate of not less than 99% against Candida albicans ATCC10231, as tested according to GB / T 21866-2008 standard.

6. An inorganic multifunctional health coating according to any one of claims 1-2, characterized in that: The coating has an inactivation rate of no less than 99% against enterovirus 71 (EV71), hand-foot-mouth disease virus (Vero), and influenza A virus (H3N2), as tested according to GB / T30979-2014 standard.

7. An inorganic multifunctional health coating according to any one of claims 1-2, characterized in that: The concentration of negative oxygen ions released by the coating during use is no less than 15,000 ions / cm³. 3 Tested according to JC / T 2040-2010 standard.

8. An inorganic multifunctional health coating according to any one of claims 1-2, characterized in that: The coating adhesion is rated as Grade 1, tested using the cross-cut test method, in accordance with GB / T 9286-1998 standard; the scrub resistance is not less than 5000 cycles, tested in accordance with GB / T 9756-2018 standard; the stain resistance is rated as Grade 1, tested in accordance with GB / T 9756-2018 standard.

9. An inorganic multifunctional health coating according to any one of claims 1-2, characterized in that: The formaldehyde content of the paint is less than 0.001g / kg and the TVOC content is less than 0.01g / L. According to the GB 18582-2020 standard, it meets the additive-free environmental protection standard.

10. An inorganic multifunctional health coating according to any one of claims 1-2, characterized in that: The antibacterial and antifungal properties of the coating are rated at level 0, with a testing period of 28 days. According to the GB / T 1741-2020 standard, no microbial growth was observed.

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