Indoor coating with self-purification function and preparation method thereof

Abstract

The invention relates to the field of environment-friendly functional materials, and discloses an indoor coating with a self-purification function and a preparation method of the indoor coating. 3-5 parts of modified zeolite; 1 to 2 parts of chitosan; 2 to 3 parts of water-based siloxane resin; 1 to 3 parts of nano titanium dioxide; 0.5 to 1.5 parts of nitrogen-doped zinc oxide; 0.05 to 0.1 part of platinum or palladium nano particles; 2 to 4 parts of titanium silicalite; 1 to 2 parts of tea polyphenol; and 1-2 parts of a molecular sieve compound. Through the design of a multi-layer composite structure, efficient purification under the conditions of natural light and low light is achieved, the removal rates of formaldehyde, TVOC and other harmful gases reach 90% or above and 95% or above respectively, bacterium breeding is inhibited through the slow-release antibacterial layer and the self-cleaning surface layer, pollutant accumulation is avoided, and the environment is protected. The continuous and stable purification effect in a high-humidity and complex environment is ensured.

Description

Technical Field

[0001] The invention relates to the field of environmentally friendly functional materials, in particular to self-purification functional indoor coatings and a preparation method thereof. Background Art

[0002] At present, interior paint is not only used as a decorative material, but also plays a role in improving air quality. With people's pursuit of healthy life, paint with air purification function has received widespread attention. Such paints are usually prepared by special methods, adding functional ingredients with adsorption or decomposition effects to the paint matrix, giving it the ability to purify harmful gases such as formaldehyde, benzene, TVOC, etc., thereby improving the air quality of the living environment.

[0003] Existing self-purification functional coatings usually rely on ingredients such as activated carbon, photocatalysts or plant extracts to achieve air purification effects through physical adsorption, photocatalytic reactions, etc. For example, activated carbon coatings remove pollutants by adsorbing gas molecules, while photocatalytic coatings use the catalytic reaction of nano-titanium dioxide under ultraviolet light to oxidize and decompose pollutants into harmless substances. These coatings can remove pollutants such as formaldehyde and TVOC to a certain extent and reduce the concentration of harmful gases in the air.

[0004] However, the existing technology still has some shortcomings in practical applications. Among them, the purification effect of activated carbon coatings decreases after the adsorption reaches saturation, and pollutants cannot be removed continuously. Photocatalytic coatings usually rely on ultraviolet light sources, and the catalytic efficiency is limited under indoor natural light conditions, making it difficult to effectively play a purification role. In addition, the purification effect of some coatings is unstable in high humidity or complex environments, and it is easy to cause problems such as pollutant adhesion and weakened antibacterial effect, making it difficult to meet the needs of long-term use. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a self-purifying functional indoor paint and a preparation method thereof, which solves the problems of insufficient purification efficiency of the existing paint in terms of purification durability and low light environment.

[0006] To achieve the above purpose, the present invention is implemented by the following technical scheme: a self-purifying functional indoor paint, the paint comprises the following components in parts by weight:

[0007] Activated carbon fiber: 2-4 parts;

[0008] Modified zeolite: 3-5 parts;

[0009] Chitosan: 1-2 parts;

[0010] Water-based silicone resin: 2-3 parts;

[0011] Nano titanium dioxide: 1-3 parts;

[0012] Nitrogen-doped zinc oxide: 0.5-1.5 parts;

[0013] Platinum or palladium nanoparticles: 0.05-0.1 parts;

[0014] Titanium silicate: 2-4 parts;

[0015] Tea polyphenols: 1-2 parts;

[0016] Molecular sieve complex: 1-2 parts;

[0017] Microcapsule-encapsulated antibacterial agent: 1-2 parts;

[0018] Plant extract active ingredients: 1-2 parts;

[0019] Polyethylene glycol-polyether copolymer: 1-2 parts;

[0020] Acrylic modified polyurethane resin: 4-6 parts;

[0021] Palladium or platinum nanocatalyst: 0.1-0.3 parts;

[0022] Water-based acrylic emulsion: 15-20 parts;

[0023] Deionized water: 20-30 parts;

[0024] Film-forming aid: 1 to 3 parts.

[0025] Preferably, the coating is composed of a multi-layer composite structure, and the material ratio of each layer includes:

[0026] Surface layer: activated carbon fiber, modified zeolite, chitosan, water-based silicone resin;

[0027] Photocatalytic purification layer: nano-titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles;

[0028] Adsorption-decomposition composite layer: titanium silicalite, tea polyphenols, molecular sieve composite;

[0029] Sustained-release layer: microcapsules encapsulating antibacterial agents, plant-extracted active ingredients, and polyethylene glycol-polyether copolymers;

[0030] Attached to the deep catalytic layer: acrylic modified polyurethane resin, palladium or platinum nanocatalyst, water-based adhesive.

[0031] Preferably, the surface layer has a self-cleaning function, adopts an alternating structure of fluorinated polymer and silicone to prevent the attachment of pollutants, and gives the surface a lotus effect.

[0032] The present invention also provides a method for preparing a self-purifying functional indoor paint, comprising the following steps:

[0033] S1. Material dispersion: dispersing activated carbon fiber, modified zeolite, nano titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles in deionized water to form a uniformly dispersed solution;

[0034] S2, matrix mixing: mixing the water-based acrylic emulsion, deionized water and the film-forming aid to form a fluid water-based matrix;

[0035] S3. Mixing of interlayer materials: Add the surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and material components attached to the deep catalytic layer into the matrix in order according to the formula ratio, and perform high shear dispersion stirring to make the materials of each layer evenly dispersed;

[0036] S4, multi-layer coating: coating in the order of surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and attached to deep catalytic layer, and performing inter-layer curing;

[0037] S5. Overall curing and film formation: After coating, the coating is subjected to overall UV light curing and low-temperature drying to form a stable multi-layer structure.

[0038] Preferably: S1 further comprises:

[0039] Using an ultrasonic disperser, activated carbon fiber, modified zeolite, nano titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles are dispersed in deionized water respectively, so that the active materials are uniformly dispersed;

[0040] All dispersion solutions were added to the mixing matrix in sequence to ensure uniform distribution of the components.

[0041] Preferably: S2 further comprises:

[0042] The aqueous acrylic emulsion and deionized water are placed in a stirrer according to a certain proportion and stirred;

[0043] Add film-forming aids and stir to form a uniform aqueous matrix to ensure the stability and fluidity of the matrix.

[0044] Preferably: S3 further comprises:

[0045] Mixing of surface materials: adding activated carbon fiber, modified zeolite, chitosan and aqueous silicone resin into the matrix, stirring with a high shear disperser to form a surface dispersion solution;

[0046] Mixing materials for the photocatalytic purification layer: adding nano-titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles in proportion, stirring evenly, and forming a photocatalytic layer dispersed solution;

[0047] Adsorption-decomposition composite layer material mixing: adding titanium silicalite, tea polyphenols and molecular sieve complex into the matrix and stirring at high speed to form an adsorption composite layer dispersed solution;

[0048] Mixing the sustained-release layer materials: adding the microcapsule-coated antibacterial agent, the plant-extracted active ingredient, and the polyethylene glycol-polyether copolymer into the matrix, stirring at a low speed to form a sustained-release layer dispersion solution;

[0049] Adhesion to the deep catalytic layer material mixing: Add acrylic modified polyurethane resin, palladium or platinum nanocatalyst and water-based adhesive into the matrix, stir evenly to form an adhesion layer dispersion solution.

[0050] Preferably: S4 further comprises:

[0051] The coating is carried out in the order of surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and attached to the deep catalytic layer to ensure uniform coating thickness of each layer;

[0052] Each layer is UV-cured after coating to ensure the independence and stability of each layer.

[0053] Preferably: S5 further comprises:

[0054] Overall UV light curing: The multi-layer coating is subjected to overall UV light curing to make all layers completely film-formed;

[0055] Low temperature drying: The cured paint is placed in a low temperature environment to dry for 12 to 24 hours to further improve the hardness and durability of the paint.

[0056] Preferably, after curing and drying, the coating has the ability to efficiently remove formaldehyde, benzene series and ammonia, and can decompose the absorbed harmful gases into carbon dioxide and water.

[0057] The present invention provides a self-purifying functional indoor paint and a preparation method thereof. It has the following beneficial effects:

[0058] 1. The coating of the present invention has the ability to efficiently remove indoor harmful gases such as formaldehyde and TVOC, and still maintains a significant purification effect under natural light or low light conditions, achieving a formaldehyde removal rate of more than 90% and a TVOC removal rate of more than 95%, ensuring long-lasting indoor air purification performance.

[0059] 2. The coating of the present invention adopts a multi-layer composite structure, combining physical adsorption, chemical adsorption and photocatalytic decomposition, and can completely decompose the adsorbed harmful gases into harmless carbon dioxide and water, achieving a lasting and thorough purification effect and avoiding the problem of pollutant saturation.

[0060] 3. The paint is designed with a slow-release antibacterial layer and a self-cleaning surface, which can inhibit bacterial growth in high-humidity environments while avoiding the accumulation of pollutants on the surface, ensuring the long-term cleanliness and safety of the paint, and is suitable for a variety of complex indoor environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] Please refer to the attached Figure 1 The embodiment of the present invention provides a self-purifying functional indoor paint and a preparation method thereof, wherein the paint comprises the following components in parts by weight:

[0064] Activated carbon fiber: 2-4 parts. The microporous structure of activated carbon fiber can capture and lock molecular-scale pollutants, making it impossible for the pollutants to be released into the air again, thereby improving the paint's capture efficiency of harmful gases, extending the service life of the adsorption layer, reducing the risk of saturation of the adsorption layer, and ensuring the paint's lasting purification effect;

[0065] Modified zeolite: 3-5 parts. Modified zeolite is used to capture small molecular pollutants such as formaldehyde. The pore size of the modified zeolite molecular sieve structure is more uniform, and the surface has a stronger electronegativity, which attracts the more polar formaldehyde molecules, thereby enhancing the adsorption effect of small molecular gases such as formaldehyde;

[0066] Chitosan: 1-2 parts. Chitosan improves the adsorption performance of the coating and enhances its environmental protection and safety, making the coating maintain long-term stability during multiple adsorption processes, ensuring a long-lasting air purification effect;

[0067] Water-based silicone resin: 2-3 parts. The hydrophobicity of silicone resin creates a "lotus effect" on the surface, which means that water droplets and dust are difficult to adhere to and easily slide off. This self-cleaning function can prevent the coating surface from being covered by pollutants and ensure the stability of the purification function;

[0068] Nano titanium dioxide: 1-3 parts. The photocatalytic function of nano titanium dioxide effectively improves the purification ability of the coating under natural light or artificial light conditions, enhances the thoroughness of pollutant decomposition, and reduces the risk of secondary pollution;

[0069] Nitrogen-doped zinc oxide: 0.5-1.5 parts. Nitrogen-doped zinc oxide improves the purification effect of the coating in daily indoor environments, supplements the insufficient catalysis of titanium dioxide under visible light conditions, and enhances the broad-spectrum purification of the coating;

[0070] Platinum or palladium nanoparticles: 0.05-0.1 parts. Platinum or palladium nanoparticles significantly increase the catalytic decomposition rate, allowing the coating to efficiently remove pollutants under lower light conditions and temperatures, thereby increasing the purification range and stability of the coating;

[0071] Titanium silicate zeolite: 2-4 parts. The addition of titanium silicate zeolite improves the selective removal effect of the coating on pollutants of different molecular sizes and types, ensuring the multiple purification capabilities and durability of the coating;

[0072] Tea polyphenols: 1-2 parts. Tea polyphenols increase the paint's antioxidant and purification durability, and improve the paint's initial purification ability in the process of capturing and partially degrading pollutants.

[0073] Molecular sieve composite: 1-2 parts. The microporous structure of molecular sieve has selective adsorption, has strong adsorption effect on small molecular pollutants, and can classify gas molecules during the adsorption process, thereby improving the adsorption effect of the coating on complex pollutants in the air and extending the service life and purification stability of the adsorption layer;

[0074] Microcapsule-coated antibacterial agent: 1-2 parts. Microcapsule-coated antibacterial agent improves the antibacterial and anti-mildew effect of the coating, is suitable for use in humid environments, and ensures that the coating is clean for a long time;

[0075] Plant-extracted active ingredients: 1-2 parts. Plant-extracted active ingredients enhance the deodorizing and environmental performance of the coating, making it suitable for use in various indoor environments, especially in homes, offices and other long-term use scenarios;

[0076] Polyethylene glycol-polyether copolymer: 1-2 parts. Polyethylene glycol-polyether copolymer gives the coating an intelligent response function under humidity conditions, enhancing the coating's adaptability and environmental stability;

[0077] Acrylic acid modified polyurethane resin: 4-6 parts. Acrylic acid modified polyurethane resin enhances the adhesion and durability of the coating on various substrate surfaces and extends the service life of the coating.

[0078] Palladium or platinum nanocatalyst: 0.1-0.3 parts. Palladium or platinum nanocatalyst improves the catalytic efficiency and purification performance of the coating, ensuring a high purification effect in a low-temperature environment;

[0079] Water-based acrylic emulsion: 15-20 parts. Water-based acrylic emulsion improves the film-forming quality of the coating, making the coating process smooth and environmentally friendly.

[0080] Deionized water: 20-30 parts. Deionized water ensures the uniformity and environmental friendliness of the coating preparation process and avoids the effects of impurities on coating performance.

[0081] Film-forming aid: 1 to 3 parts. Film-forming aid helps the coating to achieve a firm adhesion effect on different substrates, reduces defects such as bubbles and cracks during the film-forming process, improves the overall quality and aesthetics of the coating, and enables it to maintain purification performance and surface integrity for a long time.

[0082] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, the coating is composed of a multi-layer composite structure, and the material ratio of each layer includes:

[0083] Surface layer: activated carbon fiber, modified zeolite, chitosan, water-based silicone resin. The high specific surface area and porous structure of activated carbon fiber and modified zeolite can quickly adsorb harmful gases such as formaldehyde, benzene and ammonia in the air. The amino groups in chitosan molecules can form hydrogen bonds with polar pollutant molecules to enhance the adsorption effect. The water-based silicone resin provides hydrophobicity to prevent dust and dirt from adhering, forming a lotus leaf effect. Through the lotus leaf effect, the surface can remain clean for a long time, extending the durability of the purification effect.

[0084] Photocatalytic purification layer: nano-titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles. Under the irradiation of ultraviolet light or indoor visible light, nano-titanium dioxide and nitrogen-doped zinc oxide produce electron-hole pairs, which react with moisture and oxygen in the air to generate hydroxyl radicals. These active substances can decompose pollutants such as formaldehyde and benzene into carbon dioxide and water. Platinum or palladium nanoparticles further improve the efficiency of the photocatalytic process, especially at low temperatures or insufficient light, showing good catalytic performance, improving the removal rate of the coating for formaldehyde, benzene and ammonia, and will not produce secondary pollution, ensuring that the coating maintains its purification performance for a long time;

[0085] Adsorption-decomposition composite layer: titanium silicalite, tea polyphenols, molecular sieve composite. Titanium silicalite, as a porous material, has a strong adsorption capacity for small molecule harmful gases. The phenolic compounds in tea polyphenols have antioxidant properties and can initially oxidize pollutants. The molecular sieve composite effectively screens and captures pollutants of different molecular sizes through its microporous structure to achieve efficient purification. The multi-stage decomposition function prolongs the durability of the purification effect, ensuring the durability and versatility of the coating in complex environments.

[0086] Sustained-release layer: microcapsules encapsulate antimicrobial agents, active ingredients extracted from plants, and polyethylene glycol-polyether copolymers. Microcapsule technology enables the antimicrobial agent to be released gradually, effectively controlling the volatilization rate of the antimicrobial ingredients. The active ingredients extracted from plants have natural antimicrobial and deodorizing effects. Polyethylene glycol-polyether copolymers, as temperature and humidity responsive materials, can increase the release rate of antimicrobial agents under humid conditions, thereby improving the comprehensive protective effect and durability of the coating, preventing the growth of bacteria and mold, and ensuring the cleanliness of the air and wall environment;

[0087] Attached to the deep catalytic layer: acrylic modified polyurethane resin, palladium or platinum nanocatalyst, water-based adhesive. Acrylic modified polyurethane resin provides strong adhesion, allowing the coating to be firmly attached to substrates such as walls. Palladium or platinum nanocatalysts have catalytic effects and can accelerate the decomposition of harmful gases at low temperatures. Water-based adhesives ensure the bonding strength between coatings and improve overall stability. Through deep catalytic decomposition of pollutants, it ensures the thoroughness of the purification effect and improves the overall purification efficiency and life of the coating.

[0088] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, the surface layer has a self-cleaning function, and an alternating structure of fluorinated polymer and siloxane is used to prevent the attachment of pollutants, giving the surface a lotus leaf effect. The combination of fluorinated polymer and siloxane gives the coating surface a low surface energy characteristic, making the surface highly hydrophobic. Fluorinated polymers have low surface energy and a smooth surface, which can effectively reduce the adhesion of water and pollutants on the coating surface, thereby reducing the cleaning frequency and maintenance requirements, improving the durability and aesthetics of the coating, and ensuring the stability and self-purification performance of the coating in long-term use.

[0089] The present invention also provides a method for preparing a self-purifying functional indoor paint, comprising the following steps:

[0090] S1. Material dispersion: Activated carbon fiber, modified zeolite, nano titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles are dispersed in deionized water to form a uniformly dispersed solution. Through ultrasonic or high shear dispersion, the active ingredients are evenly distributed to form a stable dispersed solution, avoiding agglomeration problems, ensuring the effective distribution of each component and maximizing the final purification performance. The dispersed solution treated in this way ensures the activity of the material and the uniformity of the subsequent coating, which helps to improve the purification effect and durability of the coating;

[0091] S2. Matrix mixing: Mix water-based acrylic emulsion, deionized water and film-forming aids to form a fluid water-based matrix. The water-based acrylic emulsion provides a stable matrix during the film-forming process of the coating, allowing the material to be evenly distributed and film-formed; deionized water ensures the purity of the system and avoids the interference of impurities on the performance of the coating. The film-forming aid can promote the film-forming speed of the coating and the smoothness of the coating, so that the final coating has uniform thickness and finish;

[0092] S3, interlayer material mixing: add the surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and material components attached to the deep catalytic layer to the matrix in order according to the formula ratio, and perform high-shear dispersion stirring to evenly disperse the materials of each layer. The high-shear dispersion technology allows the components of each layer to be fully dispersed in the matrix to form a stable and uniform dispersion system, ensuring that the functional materials of each layer can be evenly attached and play their corresponding roles. By dispersing in sequence, cross-contamination between materials can be effectively avoided, and different functional layers can be independently layered during subsequent coating;

[0093] S4, multi-layer coating: coating in the order of surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and attached to the deep catalytic layer, and interlayer curing. The layered treatment of multi-layer coating can ensure the relative independence of each layer of functional materials, and the function of each layer will not be interfered with by the components of other layers. UV light curing can quickly make the coating film, while ensuring that the coating surface is smooth and firmly adhered. The multi-layer structure formed by this sequential coating and curing steps has higher physical stability and chemical durability;

[0094] S5. Overall curing and film formation: After coating, the coating is subjected to overall UV curing and low-temperature drying to form a stable multi-layer structure. Overall UV curing allows the coating surface to quickly harden and form a film, improving the scratch resistance and durability of the coating. Low-temperature drying can gradually eliminate residual moisture and solvents in the coating, ensure the stability of the coating's internal structure, avoid component decomposition caused by high temperature, and achieve the best adhesion effect of the coating.

[0095] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, S1 further comprises:

[0096] Use an ultrasonic disperser to disperse activated carbon fiber, modified zeolite, nano titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles in deionized water respectively, so that the active materials form a uniformly dispersed state. Ultrasonic dispersion makes the active materials evenly distributed in deionized water, ensuring that the particles do not agglomerate, maintain nanometer-level particle size, and increase the specific surface area and reaction activity of the active materials. This uniformly dispersed state enables the functional materials of the coating to fully exert their purification effect, ensuring the uniformity and stability of the coating in subsequent multi-layer coating;

[0097] All dispersed solutions are added to the mixed matrix in sequence to ensure uniform distribution of each component. The step-by-step mixing operation ensures the uniformity of the dispersed solution, allowing each component to be evenly embedded in the structure of the coating, improving the overall functionality and stability of the coating.

[0098] Please refer to the attached Figure 1In a preferred embodiment of the present invention, S2 further comprises:

[0099] The aqueous acrylic emulsion and deionized water are placed in a stirrer in a certain proportion and stirred. The initial mixing of the aqueous acrylic emulsion and deionized water ensures that the matrix has a moderate viscosity and good fluidity, providing a stable dispersion environment for the subsequent addition of ingredients.

[0100] Adding film-forming aids and stirring to form a uniform water-based matrix to ensure the stability and fluidity of the matrix. The uniform distribution of film-forming aids makes the coating film-forming effect better, avoiding the performance degradation caused by uneven coating or film-forming defects. The water-based matrix formed after adding film-forming aids has stronger film-forming stability and fluidity, ensuring the smoothness of the coating during construction and the flatness of the coating after construction, and improving the quality and visual effect of the final product.

[0101] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, S3 further comprises:

[0102] Surface material mixing: Add activated carbon fiber, modified zeolite, chitosan and water-based silicone resin to the matrix, use a high shear disperser to stir, and form a surface dispersion solution. Through high shear dispersion, the surface material forms a stable and uniform dispersion solution, ensuring the uniform distribution of each component. The surface solution provides good adsorption and self-cleaning properties for the coating, making its surface less likely to be covered by pollutants, thereby improving the purification effect and durability of the coating;

[0103] Mixing of photocatalytic purification layer materials: Add nano-titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles in proportion, stir evenly, and form a photocatalytic layer dispersion solution. The photocatalytic purification layer dispersion solution forms a coating layer with high-efficiency photocatalytic performance, which can decompose pollutants under both natural light and artificial light, significantly enhance the purification function of the coating, and reduce the dependence on light conditions;

[0104] Adsorption-decomposition composite layer material mixing: titanium silicalite, tea polyphenols and molecular sieve complex are added to the matrix and stirred at high speed to form an adsorption composite layer dispersion solution. The uniform dispersion under high-speed stirring ensures the stability and durability of the adsorption-decomposition layer material, and improves the multi-level purification effect of the coating. This layer shows good adsorption and initial decomposition performance in a highly polluted environment, which prolongs the duration of the purification effect;

[0105] Mixing of sustained-release layer materials: Add microcapsule-coated antimicrobial agents, plant-extracted active ingredients, and polyethylene glycol-polyether copolymers to the matrix and stir at a low speed to form a sustained-release layer dispersion solution. The uniform dispersion under high-speed stirring ensures the stability and durability of the adsorption-decomposition layer materials, and enhances the multi-level purification effect of the coating. This layer exhibits good adsorption and initial decomposition performance in a highly polluted environment, extending the duration of the purification effect;

[0106] Adhesion to the deep catalytic layer material mixing: Add acrylic modified polyurethane resin, palladium or platinum nanocatalyst and water-based adhesive to the matrix, stir evenly to form an adhesion layer dispersion solution. After uniform stirring, the adhesion to the deep catalytic layer material forms a stable dispersion solution, which greatly enhances the adhesion of the coating on the substrate and ensures the deep catalytic decomposition ability. This layer provides strong adhesion and deep purification effect, improving the durability and long-term purification performance of the coating.

[0107] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, S4 further comprises:

[0108] The coating is carried out in the order of surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and attached to the deep catalytic layer to ensure uniform coating thickness of each layer. Layered coating and precise thickness control can ensure that the functional materials of each layer can effectively play their role without being affected by other layers. The uniformity of thickness of each layer ensures the effective distribution of materials in each layer and avoids performance differences caused by uneven thickness. At the same time, uniform thickness control enables the function of each layer to be optimally exerted, improves the purification performance and service life of the overall coating, and ensures the stability and effect of the coating in practical applications;

[0109] UV light curing is performed after each layer is applied to ensure the independence and stability of each layer. UV light curing ensures that each layer forms a film quickly after coating, avoiding the mixing of materials and interference between layers, thereby ensuring the functional independence of each layer. This curing treatment method improves the overall wear resistance, adhesion and durability of the coating, ensuring that the coating can play a stable purification and protection role for a long time under complex environmental conditions.

[0110] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, S5 further comprises:

[0111] Overall UV curing: UV curing is performed on the multi-layer coating to make all layers completely film-formed. Overall UV curing can quickly excite the photosensitive groups in the coating material, so that the polymer chains in the coating form a cross-linked structure, thereby quickly hardening the entire coating. UV curing technology can complete the curing process of multi-layer coatings in a short time, forming a dense coating with high hardness, enhancing the mechanical strength and wear resistance of the coating, and effectively reducing the deformation and shrinkage of the coating caused by traditional curing methods;

[0112] Low-temperature drying: The cured coating is placed in a low-temperature environment to dry for 12 to 24 hours to further improve the hardness and durability of the coating. Low-temperature drying can avoid the damage of high temperature to the active ingredients in the coating, ensuring that the catalytic performance of active components such as nano-titanium dioxide and zinc oxide will not be inactivated by high temperature. During the low-temperature drying process, the moisture in the coating gradually evaporates, and will not cause drastic shrinkage or stress accumulation of the internal structure, so that the entire coating maintains density and flatness, extending the service life of the coating.

[0113] Please refer to the attached Figure 1 In a preferred embodiment of the present invention, after curing and drying, the coating has the ability to efficiently remove formaldehyde, benzene and ammonia, and can decompose the adsorbed harmful gases into carbon dioxide and water. Through photocatalytic decomposition technology, the coating can completely convert the adsorbed harmful gases into harmless small molecules, avoiding the saturation problem and secondary pollution risk of traditional adsorption materials. At the same time, the multi-layer composite structure provides a progressive purification effect, so that the coating can show excellent air purification performance under different environmental conditions. Moreover, through photocatalytic decomposition technology, the coating can completely convert the adsorbed harmful gases into harmless small molecules, avoiding the saturation problem and secondary pollution risk of traditional adsorption materials.

[0114] In order to better understand the present invention, the above contents are described in detail below in conjunction with specific embodiments.

[0115] Example 1: Standard Indoor Air Purification Coating

[0116] Purpose: Suitable for air purification and odor control in general home or office environments.

[0117] formula:

[0118] Activated carbon fiber: 3 parts

[0119] Modified zeolite: 4 parts

[0120] Chitosan: 1.5 parts

[0121] Water-based silicone resin: 2.5 parts

[0122] Nano titanium dioxide: 2 parts

[0123] Nitrogen-doped zinc oxide: 1 part

[0124] Platinum nanoparticles: 0.08 parts

[0125] Titanium silicate: 3 parts

[0126] Tea polyphenols: 1.5 parts

[0127] Molecular sieve complex: 1.5 parts

[0128] Microcapsule coated antibacterial agent: 1.5 parts

[0129] Plant extract active ingredients: 1.5 parts

[0130] Polyethylene glycol-polyether copolymer: 1.5 parts

[0131] Acrylic modified polyurethane resin: 5 parts

[0132] Water-based acrylic emulsion: 17 parts

[0133] Deionized water: 25 parts

[0134] Film-forming aid: 2 parts

[0135] Preparation steps:

[0136] According to the dispersion method (S1-S5) in the claims, the components are mixed in layers according to proportions.

[0137] The multi-layer structure is formed by high shear dispersion and UV curing process.

[0138] Finally, low-temperature drying treatment is carried out to ensure the stability and purification function of the coating.

[0139] Results: This formula is suitable for everyday home and office environments, removing common indoor pollutants such as formaldehyde, benzene and ammonia, and continuously purifying the air under light conditions, effectively controlling odors. The coating has excellent durability and cleaning functions, suitable for long-term use.

[0140] Example 2: Highly efficient antibacterial air purification coating

[0141] Purpose: Used in medical institutions or areas with high traffic density, such as hospitals, clinics, public places, etc., focusing on antibacterial and purification functions.

[0142] formula:

[0143] Activated carbon fiber: 4 parts

[0144] Modified zeolite: 5 parts

[0145] Chitosan: 2 parts

[0146] Water-based silicone resin: 2.5 parts

[0147] Nano titanium dioxide: 2.5 parts

[0148] Nitrogen-doped zinc oxide: 1.5 parts

[0149] Palladium nanoparticles: 0.1 parts

[0150] Titanium silicate: 4 parts

[0151] Tea polyphenols: 2 parts

[0152] Molecular sieve complex: 2 parts

[0153] Microencapsulated antimicrobial agent: 2 parts

[0154] Plant extract active ingredients: 2 parts

[0155] Polyethylene glycol-polyether copolymer: 2 parts

[0156] Acrylic modified polyurethane resin: 6 parts

[0157] Water-based acrylic emulsion: 18 parts

[0158] Deionized water: 20 parts

[0159] Film-forming aid: 3 parts

[0160] Preparation steps:

[0161] Disperse and mix in sequence according to the described ratio and layering requirements.

[0162] Multilayer coating is performed using a UV curing and high-efficiency antibacterial sustained-release layer material mixing method.

[0163] After coating, dry at low temperature for 12 hours to ensure the sustained release effect of the antibacterial agent.

[0164] Effect: Based on general purification, this formula focuses on enhancing antibacterial ingredients, and is suitable for places with high antibacterial requirements such as hospitals and clinics. It can inhibit the growth of bacteria and fungi for a long time, while achieving efficient air purification, improving the air quality and safety of public places.

[0165] Example 3: Enhanced deodorizing and dehumidifying self-purifying coating

[0166] Purpose: Suitable for use in kitchens, bathrooms or humid environments with enhanced deodorizing and dehumidifying functions.

[0167] formula:

[0168] Activated carbon fiber: 4 parts

[0169] Modified zeolite: 3 parts

[0170] Chitosan: 2 parts

[0171] Water-based silicone resin: 3 parts

[0172] Nano titanium dioxide: 1.5 parts

[0173] Nitrogen-doped zinc oxide: 1 part

[0174] Platinum or palladium nanoparticles: 0.08 parts

[0175] Titanium silicate: 3 parts

[0176] Tea polyphenols: 2 parts

[0177] Molecular sieve complex: 2 parts

[0178] Microcapsule coated antibacterial agent: 1 part

[0179] Plant extract active ingredients: 1 part

[0180] Polyethylene glycol-polyether copolymer: 2 parts

[0181] Acrylic modified polyurethane resin: 5 parts

[0182] Water-based acrylic emulsion: 20 parts

[0183] Deionized water: 20 parts

[0184] Film-forming aid: 2 parts

[0185] Preparation steps:

[0186] Using standard dispersing methods, mix all ingredients one by one and ensure uniform dispersion.

[0187] The materials are coated layer by layer in the order of surface layer, adsorption layer, photocatalytic layer, etc. to ensure the stability of the sustained-release layer material.

[0188] After coating, the whole is UV cured and placed in a low temperature environment to dry in order to maintain the film-forming effect.

[0189] Effect: This paint formula is specially designed for high humidity and heavy odor environments. It can absorb moisture and odor molecules in the air to achieve dehumidification and deodorization effects. This paint is suitable for high humidity environments such as kitchens and bathrooms, effectively reducing mold growth and keeping the space fresh and dry.

[0190] Comparative experiment 1: Total volatile organic compound (TVOC) removal efficiency test

[0191] Experimental purpose: To verify the high efficiency of the self-purification functional indoor paint of the present invention in removing total volatile organic compounds (TVOC).

[0192] Experimental setup

[0193] Experimental Group:

[0194] The coating of the present invention is prepared by using the self-purification functional indoor coating of the present invention according to the formula and preparation method given in the claims.

[0195] Control group:

[0196] Control group A: ordinary water-based interior paint, without self-purification function, the main component is water-based acrylic emulsion.

[0197] Control group B: Commercially available activated carbon coating, which has a certain physical adsorption effect but no photocatalytic decomposition function.

[0198] Experimental procedures

[0199] Sample preparation:

[0200] The coatings of the experimental group and each control group were respectively applied on glass plates of equal area and placed in a closed test box for curing and drying for 24 hours.

[0201] TVOC Release:

[0202] A TVOC standard gas mixture (such as toluene and styrene) is introduced into a closed test chamber so that the initial TVOC concentration reaches 5 ppm.

[0203] Test conditions:

[0204] Set constant temperature and humidity conditions (temperature 25°C, humidity 50%), and turn on common indoor light sources to simulate daily environment.

[0205] Sample testing:

[0206] Use a TVOC detector to test TVOC concentration every hour and record the changes in TVOC concentration of each group at different time points.

[0207] The comparative experimental data are shown in Table 1:

[0208] Table 1 Comparison of TVOC removal efficiency in different groups

[0209]

[0210] From the data in Table 1, we can get:

[0211] Experimental group (coating of the present invention): within 6 hours, the TVOC removal efficiency of the coating of the present invention reached 98%, and the TVOC concentration was rapidly reduced within the first 3 hours, showing a high initial adsorption and decomposition capacity.

[0212] Control group A (ordinary water-based paint): The TVOC removal effect was almost not obvious, the TVOC concentration only decreased slightly, and the removal efficiency was less than 25% after 6 hours, indicating that it did not have significant TVOC removal ability.

[0213] Control group B (activated carbon coating): The TVOC concentration decreased within the first hour, but the adsorption effect gradually weakened afterwards. After 6 hours, the removal rate was about 38%, which failed to achieve efficient TVOC purification, and the adsorption effect decreased with time.

[0214] Through comparative testing, this experiment concluded that the experimental group achieved a TVOC removal rate of 98% within 6 hours, far exceeding the control group A and the control group B, indicating that the coating of the present invention has significant innovation and advantages in TVOC removal.

[0215] Comparative experiment 2: Formaldehyde removal efficiency test

[0216] Experimental purpose: To verify the high efficiency of the self-purification functional indoor paint of the present invention in removing formaldehyde.

[0217] Experimental setup

[0218] Experimental Group:

[0219] The coating of the present invention is prepared according to the formula and preparation method in the claims.

[0220] Control group:

[0221] Control group A: ordinary indoor water-based paint, which does not have self-purification function and only provides basic indoor decoration effect.

[0222] Control group B: Commercially available photocatalytic coating, containing a certain amount of nano-titanium dioxide, has a certain photocatalytic effect under UV light, but the purification effect under natural light is weak.

[0223] Experimental procedures

[0224] Sample preparation:

[0225] The coatings of the experimental group and the control group were respectively applied on glass plates of the same area and placed in a closed test box for curing and drying.

[0226] Formaldehyde Release:

[0227] Formaldehyde gas was introduced into the closed test box, and the initial concentration was set to 2 ppm.

[0228] Test conditions:

[0229] The constant temperature and humidity conditions (25°C, 50% humidity) were set, and common indoor light sources (such as LED lights) were used to simulate the indoor natural light environment.

[0230] Sample testing:

[0231] The formaldehyde concentration in the air was measured using a formaldehyde detector every 30 minutes, and the changes in formaldehyde concentration in each group were recorded.

[0232] The comparative experimental data are shown in Table 2:

[0233] Table 2 Comparison of formaldehyde removal efficiency in different groups

[0234]

[0235]

[0236] From the data in Table 2, we can get:

[0237] The experimental group achieved a removal rate of 95% within 2 hours under natural light, while the control group B had limited effect due to its reliance on UV light sources, and the control group A had almost no removal effect, which shows that the present invention can still maintain excellent purification effects under daily indoor lighting conditions.

[0238] Comparative experiment 3: Purification effect durability test

[0239] Experimental purpose: To verify the durability of the purification effect of the self-purification functional indoor paint of the present invention in long-term use.

[0240] Experimental setup

[0241] Experimental Group:

[0242] The coating of the present invention is prepared according to the formula and preparation method in the claims, and has a multi-layer composite purification structure and a slow-release function.

[0243] Control group:

[0244] Control group A: ordinary water-based paint, without purification function, only used for basic decoration.

[0245] Control group B: Commercially available activated carbon coating, which has preliminary adsorption function but lacks decomposition ability and is easily saturated.

[0246] Experimental procedures

[0247] Sample preparation:

[0248] The coatings of the experimental group and the control group were respectively applied on glass plates of the same area, and placed in a closed test box after curing and drying.

[0249] Pollutant release:

[0250] Introduce equal amounts of TVOC and formaldehyde mixed gas into the test chamber every 24 hours to ensure that the initial concentration remains constant (such as TVOC 5ppm, formaldehyde 2ppm) to simulate the indoor environment of a continuous pollution source.

[0251] Continuous monitoring:

[0252] TVOC and formaldehyde detectors were used to record the pollutant concentrations of each group every day for 30 consecutive days to observe the long-term purification effect of the coating.

[0253] The comparative experimental data are shown in Table 3:

[0254] Table 3 Comparison of the durability of purification effects of different groups

[0255]

[0256] From the data in Table 3, we can get:

[0257] The experimental group coating maintained a removal rate of more than 80% within 30 days, far exceeding the control group A and the control group B, indicating that the multi-layer structure design and decomposition function of the coating of the present invention effectively avoid the saturation problem and have a long-term and stable purification effect.

[0258] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Self-purification functional indoor paint, characterized in that: The coating comprises the following components in parts by weight: Activated carbon fiber: 2-4 parts; Modified zeolite: 3-5 parts; Chitosan: 1-2 parts; Water-based silicone resin: 2-3 parts; Nano titanium dioxide: 1-3 parts; Nitrogen-doped zinc oxide: 0.5-1.5 parts; Platinum or palladium nanoparticles: 0.05-0.1 parts; Titanium silicate: 2-4 parts; Tea polyphenols: 1-2 parts; Molecular sieve complex: 1-2 parts; Microcapsule-encapsulated antibacterial agent: 1-2 parts; Plant extract active ingredients: 1-2 parts; Polyethylene glycol-polyether copolymer: 1-2 parts; Acrylic modified polyurethane resin: 4-6 parts; Palladium or platinum nanocatalyst: 0.1-0.3 parts; Water-based acrylic emulsion: 15-20 parts; Deionized water: 20-30 parts; Film-forming aid: 1 to 3 parts.

2. The self-purifying functional indoor paint according to claim 1, characterized in that: The coating is composed of a multi-layer composite structure, and the material ratio of each layer includes: Surface layer: activated carbon fiber, modified zeolite, chitosan, water-based silicone resin; Photocatalytic purification layer: nano-titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles; Adsorption-decomposition composite layer: titanium silicalite, tea polyphenols, molecular sieve composite; Sustained-release layer: microcapsules encapsulating antibacterial agents, plant-extracted active ingredients, and polyethylene glycol-polyether copolymers; Attached to the deep catalytic layer: acrylic modified polyurethane resin, palladium or platinum nanocatalyst, water-based adhesive.

3. The self-purifying functional indoor paint according to claim 1, characterized in that: The surface layer has a self-cleaning function and adopts an alternating structure of fluorinated polymers and silicones to prevent the adhesion of pollutants and give the surface a lotus effect.

4. A method for preparing a self-purifying functional indoor paint, characterized in that: Using the self-purification functional indoor paint according to any one of claims 1 to 3 comprises the following steps: S1. Material dispersion: dispersing activated carbon fiber, modified zeolite, nano titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles in deionized water to form a uniformly dispersed solution; S2, matrix mixing: mixing the water-based acrylic emulsion, deionized water and the film-forming aid to form a fluid water-based matrix; S3. Mixing of interlayer materials: Add the surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and material components attached to the deep catalytic layer into the matrix in order according to the formula ratio, and perform high shear dispersion stirring to make the materials of each layer evenly dispersed; S4, multi-layer coating: coating in the order of surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and attached to deep catalytic layer, and performing inter-layer curing; S5. Overall curing and film formation: After coating, the coating is subjected to overall UV light curing and low-temperature drying to form a stable multi-layer structure.

5. The self-purifying functional indoor paint and preparation method thereof according to claim 4, characterized in that: The S1 further comprises: Using an ultrasonic disperser, activated carbon fiber, modified zeolite, nano titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles are dispersed in deionized water respectively, so that the active materials are uniformly dispersed; All dispersion solutions were added to the mixing matrix in sequence to ensure uniform distribution of the components.

6. The self-purifying functional indoor paint and preparation method thereof according to claim 4, characterized in that: The S2 further comprises: The aqueous acrylic emulsion and deionized water are placed in a stirrer according to a certain proportion and stirred; Add film-forming aids and stir to form a uniform aqueous matrix to ensure the stability and fluidity of the matrix.

7. The self-purifying functional indoor paint and preparation method thereof according to claim 4, characterized in that: The S3 further comprises: Mixing of surface materials: adding activated carbon fiber, modified zeolite, chitosan and aqueous silicone resin into the matrix, stirring with a high shear disperser to form a surface dispersion solution; Mixing materials for the photocatalytic purification layer: adding nano-titanium dioxide, nitrogen-doped zinc oxide, platinum or palladium nanoparticles in proportion, stirring evenly, and forming a photocatalytic layer dispersed solution; Adsorption-decomposition composite layer material mixing: adding titanium silicalite, tea polyphenols and molecular sieve complex into the matrix and stirring at high speed to form an adsorption composite layer dispersed solution; Mixing the sustained-release layer materials: adding the microcapsule-coated antibacterial agent, the plant-extracted active ingredient, and the polyethylene glycol-polyether copolymer into the matrix, stirring at a low speed to form a sustained-release layer dispersion solution; Adhesion to the deep catalytic layer material mixing: Add acrylic modified polyurethane resin, palladium or platinum nanocatalyst and water-based adhesive into the matrix, stir evenly to form an adhesion layer dispersion solution.

8. The self-purifying functional indoor paint and the preparation method thereof according to claim 4, characterized in that: The S4 further comprises: The coating is carried out in the order of surface layer, photocatalytic purification layer, adsorption-decomposition composite layer, slow-release layer and attached to the deep catalytic layer to ensure uniform coating thickness of each layer; Each layer is UV-cured after coating to ensure the independence and stability of each layer.

9. The self-purifying functional indoor paint and preparation method thereof according to claim 4, characterized in that: The S5 further comprises: Overall UV light curing: The multi-layer coating is subjected to overall UV light curing to make all layers completely film-formed; Low temperature drying: The cured paint is placed in a low temperature environment to dry for 12 to 24 hours to further improve the hardness and durability of the paint.

10. The self-purifying functional indoor paint and the preparation method thereof according to claim 4, characterized in that: After being cured and dried, the coating has the ability to efficiently remove formaldehyde, benzene series and ammonia, and can decompose the adsorbed harmful gases into carbon dioxide and water.

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