Built-in efficient formaldehyde removal coating and construction method thereof

Abstract

The invention discloses a built-in efficient formaldehyde removal coating which comprises a putty powder layer and an emulsion paint layer. The latex paint layer is prepared from the following raw materials in parts by weight: 18 parts of water, 0.25 part of cellulose, 0.15 part of a PH regulator, 0.4 part of a dispersing agent, 0.2 part of a wetting agent, 0.2 part of a defoaming agent, 20 parts of titanium dioxide, 12 parts of inorganic filler, 1.5 parts of a coalescing agent, 28 parts of organic silicon emulsion, 0.15 part of a thickening agent, 0.18 part of a high-temperature preservative, 2.0 to 5 parts of aldehyde removal powder and 1 to 5 parts of manganese oxide. Through the synergistic effect of the formaldehyde removal powder and the manganese oxide, the formaldehyde in the air is effectively removed by utilizing chemical reaction and catalytic oxidation mechanisms. And the manganese oxide does not generate harmful byproducts in the process of catalytically decomposing formaldehyde, so that the safety and the environmental protection property of the coating are ensured. According to the construction method, natural materials such as shell powder and white cement are adopted, so that the method is relatively environment-friendly and non-toxic, and the influence on the indoor air quality and the health of residents is small.

Description

Technical Field

[0001] The invention relates to the field of building materials, and more particularly to an internal high-efficiency formaldehyde-removing coating and a construction method thereof. Background Art

[0002] The interior high-efficiency formaldehyde removal coating is a functional coating used on the surface of interior decoration materials. Its main purpose is to effectively remove formaldehyde in the air through chemical reactions or physical adsorption. Formaldehyde is a volatile organic compound (VOC) that is commonly found in building materials, furniture and decorations, and is harmful to human health. The interior high-efficiency formaldehyde removal coating not only has the decorative and protective effects of conventional coatings, but also has significant formaldehyde removal capabilities, thereby improving indoor air quality and protecting the health of residents.

[0003] Formaldehyde is a known carcinogen. Its main harm to the human body is respiratory and skin irritation. Long-term exposure to formaldehyde may lead to serious health problems such as respiratory diseases, skin allergies, and even cancer. Since synthetic resins and adhesives widely used in modern building and decoration materials release formaldehyde, indoor formaldehyde pollution is particularly serious. The application of high-efficiency formaldehyde-removing coatings can effectively reduce the formaldehyde concentration in indoor air, reduce the harm of formaldehyde to the human body from the source, and improve people's quality of life and health level.

[0004] Existing formaldehyde-removing coatings are mainly divided into two categories: physical adsorption type and chemical reaction type. Physical adsorption type coatings use adsorption materials (such as activated carbon, molecular sieves, etc.) to capture formaldehyde molecules in the air, thereby reducing formaldehyde concentration; chemical reaction type coatings react with formaldehyde through chemical reagents to convert formaldehyde into harmless substances such as water and carbon dioxide. These coatings can reduce indoor formaldehyde content to a certain extent, but there are large differences in their efficiency and sustainability.

[0005] However, the formaldehyde removal effect of existing coatings may be greatly affected by environmental factors, and the removal efficiency is unstable under normal or low temperature conditions, making it difficult to ensure sustained and effective formaldehyde removal capabilities. Summary of the invention

[0006] In view of the shortcomings of the prior art, the first object of the present invention is to provide an internal high-efficiency formaldehyde removal coating, which has the advantages of being able to efficiently remove formaldehyde under low temperature conditions and ensuring continuous and effective formaldehyde removal.

[0007] The second purpose of the present invention is to provide a construction precaution for an internal high-efficiency formaldehyde-removing coating, which has the advantages of ensuring the uniformity and smoothness of the coating and enhancing the formaldehyde-removing effect and protective performance of the coating.

[0008] To achieve the above technical objectives, the present invention provides the following technical solutions: an internal high-efficiency formaldehyde-removing coating, comprising a putty powder layer and a latex paint layer, the latex paint layer comprising the following raw materials in parts by weight: 18 parts of water, 0.25 parts of cellulose, 0.15 parts of a pH regulator, 0.4 parts of a dispersant, 0.2 parts of a wetting agent, 0.2 parts of a defoaming agent, 20 parts of titanium dioxide, 12 parts of an inorganic filler, 1.5 parts of a film-forming aid, 28 parts of an organosilicon emulsion, 0.15 parts of a thickener, 0.18 parts of a high-temperature preservative, 2.0-5 parts of formaldehyde-removing powder, and 1-5 parts of a manganese oxide compound.

[0009] By adopting the above technical scheme, the formaldehyde removal powder and manganese oxide in the coating work together to efficiently remove formaldehyde from the air through two mechanisms: chemical reaction and catalytic oxidation. This multiple removal mechanism ensures that the coating can maintain a stable formaldehyde removal effect under different environmental conditions. Manganese oxide can decompose formaldehyde at low temperatures, and can efficiently remove formaldehyde under low temperature environmental conditions, ensuring continuous and effective formaldehyde removal. Compared with a single physical adsorption type coating, the coating of the present invention continuously removes formaldehyde through chemical reactions, avoids the problem of easy saturation of physical adsorption type materials, and prolongs the duration of the formaldehyde removal effect. The organic silicon emulsion, cellulose, titanium dioxide and other ingredients used are all environmentally friendly materials, do not contain harmful solvents and volatile organic compounds (VOCs), and are harmless to human health and the environment. Manganese oxide does not produce harmful byproducts in the process of catalytic decomposition of formaldehyde, ensuring the safety and environmental protection of the coating. The cellulose and thickener in the coating adjust the fluidity and construction performance of the coating, making it easy to brush and construct, and suitable for various interior wall surfaces.

[0010] Further preferably, the weight parts of the raw materials of the latex paint layer are: 18 parts of water, 0.25 parts of cellulose, 0.15 parts of pH regulator, 0.4 parts of dispersant, 0.2 parts of wetting agent, 0.2 parts of defoaming agent, 20 parts of titanium dioxide, 12 parts of inorganic filler, 1.5 parts of film-forming aid, 28 parts of silicone emulsion, 0.15 parts of thickener, 0.18 parts of high-temperature preservative, 4 parts of formaldehyde removal powder, and 3 parts of manganese oxide.

[0011] By adopting the above technical scheme and further optimizing the proportion of latex paint layer components, the interior high-efficiency formaldehyde-removing coating has been significantly improved in terms of formaldehyde removal effect, coating performance, construction convenience, and environmental protection.

[0012] More preferably, the manganese oxide compound is manganese trioxide.

[0013] By adopting the above technical solution, manganese trioxide (Mn2O3) can be used as a highly efficient catalyst to catalytically decompose formaldehyde at room temperature and convert it into harmless substances (such as water and carbon dioxide). Mn2O3 can maintain high catalytic activity under low temperature conditions, so that the coating can effectively remove formaldehyde in low temperature indoor environments. The addition of Mn2O3 can also improve the wear resistance and aging resistance of the coating, so that it can still maintain good appearance and performance after long-term use. Compared with some other catalysts, Mn2O3 does not produce harmful byproducts in the process of catalytic decomposition of formaldehyde, thereby reducing the potential impact on the environment and human health.

[0014] More preferably, the formaldehyde-removing powder is nano-grade titanium dioxide.

[0015] By adopting the above technical solution, nano-scale titanium dioxide has excellent photocatalytic properties. Under light conditions, TiO2 can catalyze the decomposition of formaldehyde and convert it into water and carbon dioxide, thereby significantly improving the formaldehyde removal efficiency of the coating. Nano-scale titanium dioxide has a large specific surface area, providing more active sites for catalytic reactions and improving the ability to remove formaldehyde. TiO2 has good weather resistance and wear resistance, which enhances the durability and anti-aging properties of the coating and keeps the coating stable during long-term use. TiO2 is an environmentally friendly photocatalyst that does not produce harmful by-products. During the photocatalytic process, TiO2 does not release harmful gases, ensuring the environmental protection and safety of the coating.

[0016] More preferably, the cellulose is hydroxyethyl cellulose, which has good properties of thickening, suspending, dispersing, emulsifying, bonding, film-forming, protecting moisture and providing protective colloid.

[0017] Further preferably, the pH regulator is Dow AMP-95, which not only has excellent functions such as dispersion, thickening, pH adjustment, and non-discoloration, but also has antimicrobial (bactericidal) properties, and can also reduce the total amount of VOC (volatile organic compounds), which helps to improve environmental performance.

[0018] More preferably, the dispersant is a sodium polyacrylate dispersant, which has good thermal stability and can improve dispersion stability and fluidity.

[0019] More preferably, the wetting agent is one or more of an acrylate wetting agent or a silicone wetting agent, which has a good effect of reducing surface tension.

[0020] More preferably, the defoaming agent may be one or more of a mineral oil defoaming agent, a silicone defoaming agent and a polyether-modified polysiloxane defoaming agent.

[0021] More preferably, the titanium dioxide is rutile titanium dioxide, which has better stability than anatase titanium dioxide.

[0022] More preferably, the inorganic filler is one or more of heavy calcium carbonate, calcined kaolin and the like.

[0023] More preferably, the organosilicon emulsion is Dow Premilast TMSF-508 emulsion.

[0024] More preferably, the thickener is a polyurethane thickener, which has good dispersibility and can adjust the viscosity of the finished product.

[0025] More preferably, the high temperature preservative includes 1,2-benzisothiazolin-3-one (BIT) and methylisothiazolinone (MIT).

[0026] Further preferably, the putty powder layer comprises the following raw materials in parts by weight: 12 parts of white cement, 80 parts of shell powder, 0.1-1 parts of dispersible latex powder, 0.35 parts of cellulose, and 0.03 parts of thickener.

[0027] By adopting the above technical scheme, white cement can improve the adhesion and overall durability of the putty powder layer, so that it can adhere to the wall more firmly, and enhance the long-term stability of the putty layer. Shell powder not only improves the thickness and covering power of the putty layer, but also can effectively absorb and remove harmful substances such as free formaldehyde, benzene, ammonia and odors caused by pets, smoking and garbage in the air, purify indoor air, and has good filling performance, which can effectively fill the unevenness of the wall surface and improve the surface flatness. Shell powder not only improves the thickness and covering power of the putty layer, but also has good filling performance, which can effectively fill the unevenness of the wall surface and improve the surface flatness. The combination of shell powder and white cement enhances the hardness and compressive strength of the putty layer, making it more wear-resistant and impact-resistant, and suitable for various indoor environments. The addition of dispersible latex powder improves the fluidity and construction properties of the putty powder, making the putty layer easier to operate during the construction process, and ensuring the uniformity and smoothness of the coating. The optimized ratio of cellulose and thickener improves the surface quality of the putty layer, making it smoother and more uniform, and reducing flaws and defects in construction. The raw materials used, such as shell powder and white cement, are natural materials, relatively environmentally friendly and non-toxic, with little impact on indoor air quality and occupant health. The use of dispersible latex powder reduces the release of volatile organic compounds, further improving the environmental protection and safety of the putty layer.

[0028] Further preferably, the weight parts of raw materials for the putty powder layer are: 12 parts of white cement, 80 parts of shell powder, 0.5 parts of dispersible latex powder, 0.35 parts of cellulose, and 0.03 parts of thickener.

[0029] By adopting the above technical solution and further optimizing the proportion of putty powder layer components, the interior high-efficiency formaldehyde removal coating has been significantly improved in terms of formaldehyde removal effect, coating performance, construction convenience, and environmental protection. More preferably, the dispersible latex powder is vinyl acetate-ethylene copolymer.

[0030] By adopting the above technical solutions, vinyl acetate-ethylene copolymer (EVA) has excellent adhesion properties, which can effectively improve the bonding force between the putty layer and the wall surface, and ensure the stability and firmness of the putty layer in long-term use. EVA has good flexibility and elasticity, so that the putty layer can better resist the slight displacement and stress of the wall surface during use, and reduce cracking. The excellent dispersibility and fluidity of vinyl acetate-ethylene copolymer can improve the construction performance of putty powder, make the application smoother, and reduce the resistance and difficulty in construction. EVA latex powder is relatively environmentally friendly, with low volatile organic compound (VOC) release, which improves the environmental protection of the putty layer and the indoor air quality. EVA latex powder is a non-toxic material, which will not have adverse effects on the health of residents after use, ensuring the safety of the coating.

[0031] More preferably, the thickener is modified starch ether.

[0032] By adopting the above technical solution, the modified starch ether has a strong thickening ability, which can effectively improve the viscosity and consistency of the putty powder, making it easier to control during the construction process, reducing sagging and improving the construction quality. The modified starch ether shows good stability under various environmental conditions and can maintain the uniformity and consistency of the putty powder during storage and use. Modified starch ether is usually made by modifying natural starch, which is relatively environmentally friendly and non-toxic, and has little impact on indoor air quality and the health of residents after use. Compared with some synthetic thickeners, the modified starch ether has a lower volatile organic compound (VOC) emission, which further improves the environmental friendliness of the coating.

[0033] More preferably, the modified starch ether is one of methyl starch ether, hydroxyethyl starch ether and hydroxypropyl starch ether.

[0034] By adopting the above technical scheme, methyl starch ether has good thickening and suspension ability, which can significantly improve the viscosity and rheological properties of putty powder, making it easier to control and apply during construction. Hydroxyethyl starch ether has good water solubility and thickening ability, which can improve the viscosity and stability of the putty layer and improve the construction performance of the coating. Hydroxypropyl starch ether provides excellent thickening effect and high viscosity, is suitable for various types of putty powder, and can enhance the smoothness and fluidity of the coating. Methyl starch ether, hydroxyethyl starch ether and hydroxypropyl starch ether show good stability under different environmental conditions, can keep the performance of putty powder unchanged, and reduce the performance attenuation during storage and use. It can also improve the water resistance and weather resistance of putty powder, so that the putty layer maintains excellent performance in a humid environment and various climatic conditions.

[0035] More preferably, the white cement is one of No. 52.5 silicate white cement, No. 42.5 silicate white cement and No. 32.5 silicate white cement.

[0036] Further preferably, the shell powder is a 325-800 mesh shell powder microcell particle treated by bioactivation technology and has a porous fibrous double helix structure, which can effectively adsorb and remove harmful substances such as free formaldehyde, benzene, ammonia in the air and odors caused by pets, smoking, and garbage, and purify indoor air.

[0037] More preferably, the cellulose is hydroxypropyl methylcellulose.

[0038] A construction method for an internal high-efficiency formaldehyde-removing coating comprises at least the following steps: S1: Mix the putty powder layer and water in a weight ratio of 1:0.4 and stir evenly; S2: Spray the stirred slurry on the wall surface; S3: After drying, apply two coats of latex paint on the surface of the putty powder layer with a roller.

[0039] By adopting the above technical solution, by spraying the evenly stirred putty powder slurry on the wall surface, it is possible to ensure uniform coverage of the coating, fill the cracks and unevenness of the wall, and thus improve the flatness and smoothness of the wall. The sprayed putty powder layer can be closely combined with the wall surface, improve the adhesion of the subsequent latex paint layer, and reduce shedding and peeling. Rolling a latex paint layer on the surface of the dried putty powder layer can provide additional formaldehyde removal function. By applying two layers of latex paint, the formaldehyde removal ability of the overall coating can be significantly improved.

[0040] In summary, the present invention has the following beneficial effects: The present invention effectively removes formaldehyde from the air through the synergistic effect of formaldehyde removal powder (nano-sized titanium dioxide) and manganese oxide compounds (such as manganese trioxide), using chemical reactions and catalytic oxidation mechanisms. Manganese trioxide can maintain a high catalytic activity in a low-temperature environment, ensuring that the coating can also efficiently remove formaldehyde under low-temperature indoor conditions. Compared with physical adsorption materials, chemical reactions continuously remove formaldehyde, avoiding the problem of easy saturation of physical adsorption materials and extending the duration of the formaldehyde removal effect. The raw materials used are all environmentally friendly materials, do not contain harmful solvents and volatile organic compounds (VOCs), and are harmless to human health and the environment. Manganese oxide compounds do not produce harmful byproducts in the process of catalytic decomposition of formaldehyde, ensuring the safety and environmental protection of the coating. The cellulose and thickener in the coating adjust the fluidity and construction performance of the coating, making it easy to apply and construct, and suitable for various interior wall surfaces.

[0041] The present invention can fill the cracks and unevenness of the wall surface by spraying the putty powder slurry with uniform stirring on the wall surface, and ensure the uniform coverage of the coating. The sprayed putty powder layer can be closely combined with the wall surface, improves the adhesion of the subsequent latex paint layer, and reduces the phenomenon of falling off and peeling. At the same time, in the maintenance process of the putty layer, the adsorption effect of shell powder can be utilized to the maximum extent to adsorb harmful substances such as free formaldehyde, benzene, and ammonia in the air. After two layers of latex paint are constructed, formaldehyde can be quickly reduced in the first time, thereby significantly improving the formaldehyde removal ability of the overall coating. The raw materials used, such as shell powder and white cement, are all natural materials, relatively environmentally friendly and non-toxic, and have little impact on indoor air quality and occupant health. DETAILED DESCRIPTION

[0042] Example 1: Latex paint layer, the components included and their corresponding weight parts are shown in Table 1: The preparation method of Example 1 is as follows: first, water and cellulose are added to a dispersion kettle and dispersed at high speed for 30 minutes to completely disperse the cellulose; then, a pH regulator, a dispersant, a wetting agent, and a defoaming agent are added in sequence, and after stirring for 5 minutes, titanium dioxide and a filler are added and dispersed at high speed for 35 minutes. When the fineness is <50um, a film-forming agent and an organosilicon emulsion are added and stirred for 10 minutes, and then a thickener is added to adjust the viscosity. Finally, a high-temperature preservative, formaldehyde-removing powder, and a manganese oxide compound are added to prepare the product.

[0043] Table 1 - Examples of raw materials by weight Embodiment 2: latex paint layer, which is different from Embodiment 1 in that the weight portion of formaldehyde-removing powder is 2 parts.

[0044] Embodiment 3: latex paint layer, which is different from Embodiment 1 in that the weight portion of formaldehyde-removing powder is 5 parts.

[0045] Embodiment 4: latex paint layer, which is different from Embodiment 1 in that the weight portion of the manganese oxide compound is 1 part.

[0046] Embodiment 5: latex paint layer, which is different from Embodiment 1 in that the weight portion of the manganese oxide compound is 5 parts.

[0047] Example 6: Putty powder layer, the components included and their corresponding weight parts are shown in Table 2.

[0048] The preparation method of Example 6 is as follows: white cement, shell powder, dispersible latex powder, cellulose and thickener are sequentially added into a stirring kettle and stirred for 10 minutes to obtain the product.

[0049] Table 2-Example 6 Raw Materials by Weight Embodiment 7: Putty powder layer, which is different from Embodiment 6 in that the weight portion of dispersible latex powder is 0.1 parts.

[0050] Embodiment 8: Putty powder layer, which is different from Embodiment 6 in that the weight portion of dispersible latex powder is 1 part.

[0051] Embodiment 9: Putty powder layer, which is different from Embodiment 6 in that the thickener is hydroxyethyl starch ether.

[0052] Embodiment 10: Putty powder layer, which is different from Embodiment 6 in that the thickener is hydroxypropyl starch ether.

[0053] Preparation example: The interior high-efficiency formaldehyde removal coating includes a latex paint layer and a putty powder layer. The construction method is as follows: S1: Mix the putty powder layer and water in a weight ratio of 1:0.4 and stir evenly; S2: Spray the stirred slurry on the wall surface; S3: After drying, apply two coats of latex paint on the surface of the putty powder layer with a roller.

[0054] 1. Formaldehyde purification efficiency (≥75%) JC / T298-2010 / JCT1074-2008 2. Durability of formaldehyde purification effect (≥60%) JC / T298-2010 / JCT1074-2008 Table 3 - Latex paint layer test results Combining Table 1 and Table 3, and combining Examples 1-3, it can be seen that when the titanium dioxide content is less than 4 parts, its photocatalytic activity is reduced, resulting in insufficient formaldehyde purification efficiency. Nano-scale titanium dioxide has a large specific surface area and can provide more active sites for the decomposition of formaldehyde. Too little content will reduce these active sites and reduce the purification efficiency; the photocatalytic reaction rate will slow down, resulting in faster exhaustion of the catalyst, thereby affecting durability. Due to the reduction of active sites, the photocatalytic reaction cannot be carried out continuously, affecting the formaldehyde purification effect for a long time. Titanium dioxide content higher than 4 parts can increase the photocatalytic reaction rate and improve the formaldehyde decomposition efficiency. More titanium dioxide particles provide more active sites and enhance the purification effect; it can also extend the effective life of the catalyst and maintain a long-term efficient purification ability. However, as a functional material, increasing the content of titanium dioxide will significantly increase the production cost. Too much titanium dioxide may cause dispersibility problems in the formula, affecting the uniformity and construction performance of the coating. Too much titanium dioxide will increase the coating thickness, affect the smoothness and aesthetics of the coating, and may cause changes in other physical properties, such as increased hardness but reduced flexibility.

[0055] In combination with Example 1 and Example 4-5, it can be seen that the content of manganese oxide is less than 3 parts, the catalytic activity is insufficient, and the formaldehyde purification efficiency is low. The active sites provided by fewer manganese oxide particles are reduced, resulting in insufficient formaldehyde decomposition reaction. The persistence of the catalytic reaction is limited, resulting in a decrease in the persistence of the purification effect. The catalyst is more easily exhausted during use, affecting the long-term purification effect. When the manganese oxide content is higher than 3 parts, the catalytic reaction can be enhanced and the formaldehyde decomposition efficiency can be improved. The increased manganese oxide particles provide more active sites and improve the purification efficiency. A higher content of manganese oxide can extend the effective life of the catalyst and maintain a long-term efficient purification capability. However, too much manganese oxide may cause the coating thickness to increase, affect the smoothness and aesthetics of the coating, and may cause changes in other physical properties, such as increased hardness but reduced flexibility.

[0056] Table 4- Putty powder layer test results In combination with Table 2 and Table 4, and in combination with Examples 6-8, it can be known that the dispersible latex powder content is less than 0.5 parts, resulting in insufficient adhesion between the putty layer and the wall, affecting the stable distribution and function of the formaldehyde removal powder, thereby reducing the formaldehyde purification efficiency. Lack of sufficient dispersible latex powder, the putty layer is more prone to cracks and pores, causing formaldehyde to escape through these defects, reducing the purification efficiency. It will also cause the mechanical properties and stability of the putty layer to decrease, and it is prone to peeling and aging after long-term use, affecting the lasting formaldehyde purification effect. The dispersible latex powder content is higher than 0.5 parts, which can significantly improve the adhesion between the putty layer and the wall, ensure that the formaldehyde removal powder plays an effective role, and improve the formaldehyde purification efficiency. It can reduce cracks and pores in the putty layer, enhance the capture and purification effect of formaldehyde. Improve the mechanical properties and stability of the putty layer, extend its service life, and ensure long-term formaldehyde purification effect. However, too much dispersible latex powder content may cause the drying time of the putty layer to be extended, affecting the construction progress. It can also cause the putty layer to be too flexible, which may affect its overall strength and hardness, leading to unsatisfactory performance in certain application scenarios.

[0057] In combination with Example 6 and Example 9-10, it can be seen that methyl starch ether has good thickening and suspension ability, which can ensure that the formaldehyde removal powder in the putty powder is evenly dispersed and improve the formaldehyde purification efficiency. Methyl starch ether improves the adhesion between the putty layer and the wall, helps to stably distribute the formaldehyde removal material, and further improves the purification effect. Methyl starch ether shows good stability under various environmental conditions, can maintain the performance of the putty layer for a long time, and ensures a lasting formaldehyde purification effect. Methyl starch ether helps to improve the durability and anti-aging performance of the putty layer and prolongs the service life. Hydroxyethyl starch ether has excellent water solubility and thickening ability, helps to form a uniform and stable putty layer, and improves the formaldehyde purification efficiency. Hydroxyethyl starch ether improves the construction property of putty powder, makes it easier to evenly apply, ensures that the formaldehyde removal powder is effectively distributed throughout the putty layer, and optimizes the purification effect. Hydroxyethyl starch ether can maintain the performance of the putty layer under various environmental conditions, enhances the durability and durability of the coating. Hydroxyethyl starch ether improves the water resistance of the putty layer, reduces the performance degradation caused by a humid environment, and ensures long-term and effective formaldehyde purification. Hydroxypropyl starch ether provides higher viscosity and good thickening effect, which helps to evenly apply putty powder and improve formaldehyde purification efficiency. Hydroxypropyl starch ether improves the rheological properties of putty powder, making it easier to construct and operate, and ensuring uniform distribution of formaldehyde removal materials. Hydroxypropyl starch ether shows good stability under different environmental conditions, can maintain the performance of the putty layer, and ensure a long-lasting formaldehyde purification effect. Hydroxypropyl starch ether improves the weather resistance of the putty layer, so that it can withstand various climatic conditions in long-term use and extend its service life.

[0058] Table 5 - Preparation Example Test Results Combining Table 5 and the preparation example, it can be seen that nano-sized titanium dioxide (TiO2) is used to catalytically decompose formaldehyde under light conditions and convert it into water and carbon dioxide. Its high specific surface area provides more active sites, greatly improving the formaldehyde removal efficiency. Manganese oxide compounds have the ability to catalytically decompose formaldehyde efficiently at low temperatures and can decompose formaldehyde into harmless substances. This catalytic decomposition mechanism is not only effective under light conditions, but also maintains efficient formaldehyde removal performance under low temperature environments. Silicone emulsions (such as Dow Bio-Mer TMSF-508 emulsion) provide excellent film-forming properties, ensuring that the coating evenly covers the wall surface, increasing the sealing and durability of the coating, thereby improving the formaldehyde purification efficiency. Rutile titanium dioxide is used in combination with latex paint, which not only provides good hiding power and stability, but also enhances the mechanical strength and wear resistance of the coating, ensuring the long-term effectiveness of the coating. Cellulose and thickeners can improve the fluidity and construction performance of the coating, so that the formaldehyde removal material is evenly distributed in the coating, ensuring the formaldehyde removal efficiency during use.

[0059] White cement and shell powder in the putty powder layer provide excellent bonding and filling properties, ensuring the close bonding between the putty layer and the wall, and increasing the durability and permanence of the coating. Vinyl acetate-ethylene copolymer enhances the adhesion and flexibility of the putty layer, resists the slight displacement and stress of the wall, reduces cracking, and prolongs the service life of the coating. The thickener improves the viscosity and rheological properties of the putty powder, ensuring the stability of the coating under various environmental conditions and prolonging the lasting effect. The use of silicone emulsion, hydroxyethyl cellulose, and polyurethane thickeners reduces the release of volatile organic compounds (VOCs), ensures the environmental protection and safety of the coating, and has a positive effect on the durability of the coating.

[0060] To sum up, through the synergistic effect of high-efficiency formaldehyde removal materials and good construction methods, the interior high-efficiency formaldehyde removal coating performs better in formaldehyde purification efficiency and durability.

[0061] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the above embodiments without any creative contribution as needed. However, such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An internal high-efficiency formaldehyde removal coating, comprising a putty powder layer and a latex paint layer, characterized in that: The latex paint layer comprises the following raw materials in parts by weight: 18 parts of water, 0.25 parts of cellulose, 0.15 parts of pH regulator, 0.4 parts of dispersant, 0.2 parts of wetting agent, 0.2 parts of defoaming agent, 20 parts of titanium dioxide, 12 parts of inorganic filler, 1.5 parts of film-forming aid, 28 parts of silicone emulsion, 0.15 parts of thickener, 0.18 parts of high-temperature preservative, 2.0-5 parts of formaldehyde-removing powder, and 1-5 parts of manganese oxide.

2. The interior high-efficiency formaldehyde removal coating according to claim 1, characterized in that: The raw materials of the latex paint layer are as follows: 18 parts of water, 0.25 parts of cellulose, 0.15 parts of pH regulator, 0.4 parts of dispersant, 0.2 parts of wetting agent, 0.2 parts of defoamer, 20 parts of titanium dioxide, 12 parts of inorganic filler, 1.5 parts of film-forming aid, 28 parts of silicone emulsion, 0.15 parts of thickener, 0.18 parts of high-temperature preservative, 4 parts of formaldehyde-removing powder and 3 parts of manganese oxide.

3. The interior high-efficiency formaldehyde removal coating according to claim 2 is characterized in that: The manganese oxide compound is manganese trioxide.

4. The interior high-efficiency formaldehyde removal coating according to claim 2, characterized in that: The formaldehyde-removing powder is nano-grade titanium dioxide.

5. The interior high-efficiency formaldehyde removal coating according to claim 1, characterized in that: The putty powder layer comprises the following raw materials in parts by weight: 12 parts of white cement, 80 parts of shell powder, 0.1-1 parts of dispersible latex powder, 0.35 parts of cellulose, and 0.03 parts of thickener.

6. The interior high-efficiency formaldehyde removal coating according to claim 5, characterized in that: The weight parts of the raw materials of the putty powder layer are: 12 parts of white cement, 80 parts of shell powder, 0.5 parts of dispersible latex powder, 0.35 parts of cellulose, and 0.03 parts of thickener.

7. The interior high-efficiency formaldehyde removal coating according to claim 6, characterized in that: The dispersible latex powder is vinyl acetate-ethylene copolymer.

8. The interior high-efficiency formaldehyde removal coating according to claim 6, characterized in that: The thickener is modified starch ether.

9. The interior high-efficiency formaldehyde removal coating according to claim 8, characterized in that: The modified starch ether is one of methyl starch ether, hydroxyethyl starch ether and hydroxypropyl starch ether.

10. The construction method of the internal high-efficiency formaldehyde removal coating according to any one of claims 1 to 9 comprises at least the following steps: S1: Mix the putty powder layer and water in a weight ratio of 1:0.4 and stir evenly; S2: Spray the stirred slurry on the wall surface; S3: After drying, apply two coats of latex paint on the surface of the putty powder layer with a roller.