Waterproof decorative integrated exterior wall paint and preparation method thereof

Abstract

This invention relates to the field of building exterior wall coating technology, specifically to a waterproof and decorative integrated exterior wall coating and its preparation method. The waterproof and decorative integrated exterior wall coating is a water-based, environmentally friendly, single-component coating, prepared from the following non-toxic and environmentally friendly raw materials in parts by weight: 35-45 parts modified pure acrylic emulsion, 12-18 parts nano-silica sol, 8-15 parts composite inorganic pigment, 10-16 parts ultrafine silica powder, 6-10 parts activated kaolin, 2-5 parts nano-silica, 0.8-1.5 parts environmentally friendly dispersant, 0.3-0.6 parts environmentally friendly defoamer, 0.4-0.8 parts environmentally friendly leveling agent, 1.2-2.0 parts environmentally friendly film-forming aid, 0.5-1.0 parts water-based water-repellent agent, and 20-28 parts sterile deionized water. It is extremely environmentally friendly and non-toxic, with a high level of green safety. This invention uses no formaldehyde and no benzene throughout the entire process; it integrates waterproofing and decoration, and has excellent overall performance. This invention constructs an organic-inorganic composite film-forming system. Modified pure acrylic emulsion ensures the flexibility, adhesion and decorative texture of the coating film, while nano-silica sol and nano-silica fill the micropores to form a dense hydrophobic and waterproof barrier layer.

Description

Technical Field

[0001] This invention relates to the field of building exterior wall coating technology, specifically to a waterproof and decorative integrated exterior wall coating and its preparation method. Background Technology

[0002] Building exterior wall coatings are core materials for the decoration and protection of building facades, playing a vital role in beautifying the building's appearance, isolating it from external erosion, and protecting the wall structure. Currently, most traditional exterior wall coatings on the market are single-function; waterproof coatings have poor decorative properties, monotonous colors, and rough textures, while decorative coatings have weak waterproofing, seepage resistance, and weather protection performance, making it difficult to achieve an integrated effect of waterproofing, decoration, and protection. Furthermore, existing exterior wall coatings generally suffer from formula defects, releasing harmful substances such as formaldehyde, benzene compounds, and volatile organic compounds (VOCs) during production and construction. This not only pollutes the atmospheric environment but also endangers the health of construction workers and residents, failing to meet the industry development requirements of green building and environmentally friendly construction.

[0003] Currently, some integrated exterior wall coatings suffer from technical shortcomings. On the one hand, the coating film density is insufficient, leading to frequent problems such as capillary water seepage and rainwater penetration. After long-term use, they are prone to peeling, cracking, flaking, and discoloration, exhibiting poor weather resistance and aging resistance, and a short service life. On the other hand, to improve coating performance, most coatings add heavy metal-containing additives, toxic film-forming agents, and solvent-based additives, resulting in low environmental protection levels and failing to meet the construction standards of high-end green buildings and eco-friendly residences. Furthermore, existing coatings have poor adhesion and stain resistance, making exterior walls prone to dust and mold accumulation, resulting in high maintenance costs and cumbersome construction procedures, failing to meet the demands of modern, efficient construction.

[0004] To address the shortcomings of existing technologies, such as functional fragmentation, poor environmental performance, weak weather resistance, short service life, and cumbersome construction, this invention develops a non-toxic, environmentally friendly, waterproof, and decorative integrated exterior wall coating. By optimizing the proportion of environmentally friendly raw materials, modifying functional components, and simplifying the preparation process, the coating achieves comprehensive performance with high waterproofness, high decorativeness, weather resistance, stain resistance, and non-toxicity, thus solving the technical pain points of traditional products. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated waterproof and decorative exterior wall coating and its preparation method, solving the problems of existing exterior wall coatings such as limited functionality, poor environmental friendliness, insufficient waterproof and weather-resistant performance, and easy aging and peeling. This invention's coating uses non-toxic and environmentally friendly raw materials throughout the entire process, with no formaldehyde, benzene, heavy metals, or high VOC substances added. It possesses excellent waterproof and seepage-proof properties, decorative color, weather resistance, stain resistance, and strong adhesion. The preparation process is simple, green, and pollution-free, suitable for various building exterior wall constructions, and can achieve one-time coating, significantly reducing construction and subsequent maintenance costs.

[0006] Technical solution

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a waterproof and decorative integrated exterior wall coating, which is a water-based environmentally friendly single-component coating, prepared from the following non-toxic and environmentally friendly raw materials in parts by weight: 35-45 parts modified pure acrylic emulsion, 12-18 parts nano silica sol, 8-15 parts composite inorganic pigment, 10-16 parts ultrafine silica powder, 6-10 parts activated kaolin, 2-5 parts nano silica, 0.8-1.5 parts environmentally friendly dispersant, 0.3-0.6 parts environmentally friendly defoamer, 0.4-0.8 parts environmentally friendly leveling agent, 1.2-2.0 parts environmentally friendly film-forming aid, 0.5-1.0 parts water-based water-repellent agent, and 20-28 parts sterile deionized water.

[0008] Preferably, the waterproof and decorative integrated exterior wall coating is prepared from the following raw materials in parts by weight: 40 parts modified pure acrylic emulsion, 15 parts nano silica sol, 12 parts composite inorganic pigment, 13 parts ultrafine silica powder, 8 parts activated kaolin, 3.5 parts nano silica, 1.2 parts environmentally friendly dispersant, 0.4 parts environmentally friendly defoamer, 0.6 parts environmentally friendly leveling agent, 1.6 parts environmentally friendly film-forming aid, 0.8 parts water-based water-repellent agent, and 24 parts sterile deionized water.

[0009] Furthermore, the modified pure acrylic emulsion is a soap-free polymerized environmentally friendly pure acrylic emulsion, prepared by solvent-free polymerization of methyl methacrylate, butyl acrylate, and hydroxyethyl methacrylate. It has a solid content of 48%-52%, a VOC content of ≤10g / L, and no formaldehyde or benzene residues. It has excellent film-forming properties, flexibility, and weather resistance, making it suitable for complex outdoor climate environments. At the same time, it has extremely strong adhesion to substrates, eliminating the problem of paint peeling and flaking.

[0010] Furthermore, the nano-silica sol is an acidic, non-toxic nano-silica sol with a particle size of 10-20 nm and a solid content of 30%. It contains no heavy metals or volatile harmful substances and can form an organic-inorganic composite film-forming system with modified pure acrylic emulsion, which greatly improves the density, waterproof and impermeable properties, and UV aging resistance of the coating, while also enhancing the hardness and wear resistance of the coating.

[0011] Furthermore, the composite inorganic pigment is a compound system of iron oxide inorganic pigment, titanium dioxide, and mica powder, with a ratio of titanium dioxide: iron oxide pigment: mica powder = 5:3:2. All of them are food-grade non-toxic inorganic pigments, free of heavy metals such as lead, cadmium, and chromium, with a lightfastness rating of ≥8, strong weather resistance, and no fading or yellowing after long-term outdoor use. They have high color saturation, excellent decorative effect, and can be formulated into various exterior wall decoration colors according to requirements.

[0012] Furthermore, the ultrafine silica powder has a particle size of 800-1200 mesh, and the activated kaolin has a particle size of 600-800 mesh. Both are natural and environmentally friendly mineral fillers, free of harmful impurities, and have stable chemical properties. They can optimize the suspension and leveling properties of the coating, improve the density, crack resistance and mechanical strength of the coating film, and prevent the coating film from cracking and powdering.

[0013] Furthermore, the nano-silica is a hydrophilic nanoparticle with a particle size of 20-30nm. It is non-toxic, odorless, and chemically inert, and can fill the microscopic pores of the coating film to construct a dense waterproof barrier layer, while improving the coating's anti-fouling, wear-resistant, and anti-aging properties.

[0014] Furthermore, all of the environmentally friendly additives are water-based and VOC-free: the environmentally friendly dispersant is sodium polyacrylate water-based dispersant, which is non-toxic and non-irritating, with excellent dispersion effect, and can prevent pigment and filler agglomeration and precipitation; the environmentally friendly defoamer is polyether-modified organosilicon defoamer, with no solvent residue, and quickly eliminates bubbles in the coating preparation and construction process; the environmentally friendly leveling agent is water-based acrylic leveling agent, which can improve the smoothness and gloss uniformity of the coating film; the environmentally friendly film-forming aid is a non-toxic polyol ester film-forming aid, with high film-forming efficiency and no release of harmful substances; the water-based hydrophobic agent is organosilicon water-based hydrophobic agent, which can give the coating film excellent hydrophobic and waterproof properties without affecting the breathability of the coating.

[0015] This invention also provides a method for preparing an integrated waterproof and decorative exterior wall coating, comprising the following steps:

[0016] S1. Pretreatment of raw materials: Weigh each raw material precisely according to the weight parts, put sterile deionized water into a low-speed stirring reactor, turn on the stirring, set the stirring speed to 300-400r / min, add environmentally friendly dispersant, environmentally friendly defoamer and water-based water-repellent agent in sequence, and continue stirring for 5-8min until the additives are completely dissolved and a uniform water-based additive base liquid is formed.

[0017] S2. Powder dispersion modification: Add ultrafine silica powder, activated kaolin, nano silica and composite inorganic pigments to the base liquid in batches with a 2-minute interval between batches. After the batches are added, increase the stirring speed to 800-1000 r / min and disperse at high speed for 20-25 minutes. Then transfer to a sand mill for fine grinding until the slurry fineness is ≤30μm, with no particle agglomeration or lumps, to obtain a uniform and stable inorganic powder slurry.

[0018] S3. Emulsion compounding: Transfer the ground powder slurry into a low-speed stirring tank, adjust the stirring speed to 400-500 r / min, slowly add modified pure acrylic emulsion and nano silica sol, control the adding time to 15-20 min, and continue stirring for 10 min after the adding is completed to achieve uniform compounding of organic and inorganic phases.

[0019] S4. Additive Fine-tuning and Molding: Add environmentally friendly leveling agent and environmentally friendly film-forming aid to the composite slurry in sequence, stir for 5-10 minutes, keep the stirring at a low speed throughout the process to avoid introducing air bubbles by high-speed stirring. After stirring, test the viscosity, fineness and pH value of the slurry. Fine-tune the viscosity with sterile deionized water to ensure that the coating system is uniform and stable.

[0020] S5. Filtration and Packaging: A 200-mesh sterile filter is used to remove trace impurities and unrefined particles. After filtration, the mixture is allowed to stand for 30 minutes to defoam, and then sealed and packaged at room temperature to obtain the finished waterproof and decorative integrated exterior wall coating.

[0021] Furthermore, the entire preparation process is carried out at room temperature and pressure, without the need for high-temperature and high-pressure reactions, and there are no emissions of waste gas, wastewater, or waste residue. The production process is green and environmentally friendly, and all equipment is conventional coating production equipment. The process is simple and suitable for industrial mass production.

[0022] Beneficial effects

[0023] Compared with the prior art, the present invention has the following significant advantages:

[0024] 1. Extremely environmentally friendly and non-toxic, with a high level of green safety. This invention uses environmentally friendly raw materials that are formaldehyde-free, benzene-free, heavy metal-free, and low in VOCs throughout the entire process. It abandons traditional solvent-based additives, toxic film-forming agents, and heavy metal pigments. All components comply with the national GB18582-2020 environmental protection standard for architectural coatings, with a VOC content ≤10g / L, far below the industry limit. There is no release of harmful substances or irritating odors during the entire production, construction, and use process, posing zero harm to the human body and the environment. It is suitable for the construction requirements of green buildings and prefabricated buildings and can be used on the exterior walls of buildings with extremely high environmental protection requirements, such as schools, hospitals, and residences.

[0025] 2. Integrated Waterproofing and Decoration with Excellent Overall Performance. This invention constructs an organic-inorganic composite film-forming system. Modified pure acrylic emulsion ensures the flexibility, adhesion, and decorative texture of the coating film. Nano-silica sol and nano-silica fill the micropores, forming a dense hydrophobic and waterproof barrier layer. The coating's waterproof and seepage-resistant rating reaches above 0.3MPa, effectively resisting rainwater penetration and capillary seepage in the wall, preventing external wall leakage. At the same time, it uses highly weather-resistant inorganic composite pigments, which are color stable, highly saturated, and do not fade or yellow. The coating film is smooth, delicate, and uniform in texture, with both matte and soft-gloss decorative effects, perfectly achieving the integration of waterproof protection and aesthetic decoration.

[0026] 3. Weather resistant and anti-aging, with a long service life. The nano-functional components and inorganic mineral fillers in the formula of this invention work synergistically to significantly improve the coating's resistance to ultraviolet rays, high temperatures, freeze-thaw cycles, and weathering. It can adapt to extreme temperature differences of -30℃ to 70℃, and its outdoor service life can reach more than 15 years. There are no problems such as peeling, cracking, chalking, or discoloration after long-term use. Compared with traditional exterior wall coatings, the service life is increased by 2-3 times, which greatly reduces the cost of later renovation and maintenance of building exterior walls.

[0027] 4. Convenient construction and wide adaptability. This invention is a single-component water-based coating, eliminating the need for on-site mixing of components A and B. It can be applied directly after opening the can and can be applied using various methods such as spraying, roller coating, and brushing. It achieves a one-time coating, simplifying the construction process and improving construction efficiency. The coating has extremely strong adhesion to substrates and can stably adhere to various exterior wall substrates such as concrete, cement mortar, tiles, and insulation boards. It is suitable for the renovation of exterior walls of new and old buildings and the decoration and protection of exterior walls of new buildings, with a wide range of applications.

[0028] 5. The process is simple and highly feasible for industrialization. The preparation process of this invention is carried out at room temperature and pressure throughout, without complex reaction procedures or pollutant emissions. It has low energy consumption and high efficiency, and can achieve large-scale industrial production using conventional coating production equipment. Production costs are controllable, and it has extremely high market promotion value.

[0029] Obviously, based on the above description of the present invention, and according to common technical knowledge and conventional methods in the field, various other modifications, substitutions or alterations can be made without departing from the basic technical concept of the present invention.

[0030] The following detailed embodiments further illustrate the above-described content of the present invention. However, this should not be construed as limiting the scope of the present invention to the following examples. All technologies implemented based on the above-described content of the present invention fall within the scope of the present invention. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0032] The present invention is illustrated below with specific embodiments, but these are not intended to limit the scope of the invention. Figure 1 As shown, a waterproof and decorative integrated exterior wall coating and its preparation method are disclosed.

[0033] Example 1

[0034] A waterproof and decorative integrated exterior wall coating is prepared from the following raw materials in parts by weight: 35 parts modified pure acrylic emulsion, 12 parts nano silica sol, 8 parts composite inorganic pigment, 10 parts ultrafine silica powder, 6 parts activated kaolin, 2 parts nano silica, 0.8 parts environmentally friendly dispersant, 0.3 parts environmentally friendly defoamer, 0.4 parts environmentally friendly leveling agent, 1.2 parts environmentally friendly film-forming aid, 0.5 parts water-based water-repellent agent, and 20 parts sterile deionized water.

[0035] Its preparation method includes the following steps:

[0036] S1. Pretreatment of raw materials: Accurately weigh each raw material, put 20 parts of sterile deionized water into a low-speed stirring reactor, and add 0.8 parts of environmentally friendly dispersant, 0.3 parts of environmentally friendly defoamer and 0.5 parts of water-based water-repellent agent in sequence under stirring at 300r / min. Stir for 5min until completely dissolved to obtain water-based additive base liquid.

[0037] S2. Powder dispersion modification: Add 10 parts of ultrafine silica powder, 6 parts of activated kaolin, 2 parts of nano silica and 8 parts of composite inorganic pigment in batches, with a 2-minute interval between each batch. After the feeding is completed, increase the speed to 800 r / min and disperse at high speed for 20 minutes. Then, transfer to a sand mill to grind until the slurry fineness is ≤30μm.

[0038] S3. Emulsion compounding: Transfer the powder slurry into a mixing tank and stir at a low speed of 400r / min. Slowly add 35 parts of modified pure acrylic emulsion and 12 parts of nano silica sol, with a dripping time of 15min. Stir for 10min after the dripping is complete.

[0039] S4. Fine-tuning the molding with additives: Add 0.4 parts of environmentally friendly leveling agent and 1.2 parts of environmentally friendly film-forming agent, stir for 5 minutes, and fine-tune the viscosity of the slurry to the standard range;

[0040] S5. Filtration and Packaging: Filter with a 200-mesh filter, let stand for 30 minutes to defoam, and then seal to obtain the finished coating.

[0041] Example 2

[0042] A waterproof and decorative integrated exterior wall coating is prepared from the following raw materials in parts by weight: 40 parts modified pure acrylic emulsion, 15 parts nano silica sol, 12 parts composite inorganic pigment, 13 parts ultrafine silica powder, 8 parts activated kaolin, 3.5 parts nano silica, 1.2 parts environmentally friendly dispersant, 0.4 parts environmentally friendly defoamer, 0.6 parts environmentally friendly leveling agent, 1.6 parts environmentally friendly film-forming aid, 0.8 parts water-based water-repellent agent, and 24 parts sterile deionized water.

[0043] Its preparation method includes the following steps:

[0044] S1. Pretreatment of raw materials: Accurately weigh each raw material, put 24 parts of sterile deionized water into a low-speed stirring reactor, and add 1.2 parts of environmentally friendly dispersant, 0.4 parts of environmentally friendly defoamer and 0.8 parts of water-based water-repellent agent in sequence under stirring at 350 r / min. Stir for 6 min until completely dissolved to obtain water-based additive base liquid.

[0045] S2. Powder dispersion modification: 13 parts of ultrafine silica powder, 8 parts of activated kaolin, 3.5 parts of nano silica and 12 parts of composite inorganic pigment were added in batches, with an interval of 2 minutes between each batch. After the feeding was completed, the speed was increased to 900 r / min and dispersed at high speed for 22 minutes. Then, the mixture was transferred to a sand mill and ground until the fineness of the slurry was ≤30μm.

[0046] S3. Emulsion compounding: Transfer the powder slurry into a mixing tank and stir at a low speed of 450 r / min. Slowly add 40 parts of modified pure acrylic emulsion and 15 parts of nano silica sol, with a dripping time of 18 min. Stir for 10 min after the dripping is complete.

[0047] S4. Fine-tuning the molding with additives: Add 0.6 parts of environmentally friendly leveling agent and 1.6 parts of environmentally friendly film-forming aid, stir for 8 minutes, and fine-tune the viscosity of the slurry to the standard range;

[0048] S5. Filtration and Packaging: Filter with a 200-mesh filter, let stand for 30 minutes to defoam, and then seal to obtain the finished coating.

[0049] Example 3

[0050] A waterproof and decorative integrated exterior wall coating is prepared from the following raw materials in parts by weight: 45 parts modified pure acrylic emulsion, 18 parts nano silica sol, 15 parts composite inorganic pigment, 16 parts ultrafine silica powder, 10 parts activated kaolin, 5 parts nano silica, 1.5 parts environmentally friendly dispersant, 0.6 parts environmentally friendly defoamer, 0.8 parts environmentally friendly leveling agent, 2.0 parts environmentally friendly film-forming aid, 1.0 part water-based water-repellent agent, and 28 parts sterile deionized water.

[0051] Its preparation method includes the following steps:

[0052] S1. Pretreatment of raw materials: Accurately weigh each raw material, put 28 parts of sterile deionized water into a low-speed stirring reactor, and add 1.5 parts of environmentally friendly dispersant, 0.6 parts of environmentally friendly defoamer and 1.0 parts of water-based water-repellent agent in sequence under stirring at 400r / min. Stir for 8 minutes until completely dissolved to obtain water-based additive base liquid.

[0053] S2. Powder dispersion modification: 16 parts of ultrafine silica powder, 10 parts of activated kaolin, 5 parts of nano silica, and 15 parts of composite inorganic pigment are added in batches with a 2-minute interval between each batch. After the feeding is completed, the speed is increased to 1000r / min and dispersed at high speed for 25 minutes. Then, the mixture is transferred to a sand mill and ground until the fineness of the slurry is ≤30μm.

[0054] S3. Emulsion compounding: Transfer the powder slurry into a mixing tank and stir at a low speed of 500r / min. Slowly add 45 parts of modified pure acrylic emulsion and 18 parts of nano silica sol, with a dripping time of 20min. Stir for 10min after the dripping is complete.

[0055] S4. Fine-tuning the molding with additives: Add 0.8 parts of environmentally friendly leveling agent and 2.0 parts of environmentally friendly film-forming aid, stir for 10 minutes, and fine-tune the viscosity of the slurry to the standard range;

[0056] S5. Filtration and Packaging: Filter with a 200-mesh filter, let stand for 30 minutes to defoam, and then seal to obtain the finished coating.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waterproof decorative integrated exterior wall paint, characterized by, It is prepared from the following non-toxic and environmentally friendly raw materials in parts by weight: 35-45 parts modified pure acrylic emulsion, 12-18 parts nano silica sol, 8-15 parts composite inorganic pigment, 10-16 parts ultrafine silica powder, 6-10 parts activated kaolin, 2-5 parts nano silica, 0.8-1.5 parts environmentally friendly dispersant, 0.3-0.6 parts environmentally friendly defoamer, 0.4-0.8 parts environmentally friendly leveling agent, 1.2-2.0 parts environmentally friendly film-forming aid, 0.5-1.0 parts water-based water repellent, and 20-28 parts sterile deionized water.

2. The waterproof decorative integrated exterior wall coating according to claim 1, characterized in that, It is prepared from the following raw materials in parts by weight: 40 parts modified pure acrylic emulsion, 15 parts nano silica sol, 12 parts composite inorganic pigment, 13 parts ultrafine silica powder, 8 parts activated kaolin, 3.5 parts nano silica, 1.2 parts environmentally friendly dispersant, 0.4 parts environmentally friendly defoamer, 0.6 parts environmentally friendly leveling agent, 1.6 parts environmentally friendly film-forming aid, 0.8 parts water-based water-repellent agent, and 24 parts sterile deionized water.

3. The waterproof decorative integrated exterior wall coating according to claim 1, characterized in that, The modified pure acrylic emulsion is a soap-free polymerized environmentally friendly pure acrylic emulsion with a solid content of 48%-52%, a VOC content of ≤10g / L, and no formaldehyde or benzene residue.

4. The waterproof decorative integrated exterior wall coating according to claim 1, characterized in that, The nano-silica sol is an acidic, non-toxic nano-silica sol with a particle size of 10-20 nm, a solid content of 30%, and free of heavy metals and volatile harmful substances.

5. The waterproof decorative integrated exterior wall coating according to claim 1, characterized in that, The composite inorganic pigment is a compound system of titanium dioxide, iron oxide pigment and mica powder in a ratio of 5:3:

2. It is a non-toxic inorganic pigment with a lightfastness rating of ≥8.

6. The waterproof decorative integrated exterior wall coating according to claim 1, characterized in that, The ultrafine silica powder has a particle size of 800-1200 mesh, the activated kaolin has a particle size of 600-800 mesh, and the nano silica has a particle size of 20-30 nm. All of these are non-toxic and environmentally friendly minerals and nanopowders.

7. The waterproof and decorative integrated exterior wall coating according to claim 1, characterized in that, The environmentally friendly dispersant is sodium polyacrylate water-based dispersant, the environmentally friendly defoamer is polyether-modified silicone defoamer, the environmentally friendly leveling agent is water-based acrylic leveling agent, the environmentally friendly film-forming aid is a non-toxic polyol ester film-forming aid, and the water-based water-repellent agent is a silicone water-repellent agent. All aids are VOC-free, non-toxic, and environmentally friendly.

8. A method for preparing the waterproof and decorative integrated exterior wall coating according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Pretreatment of ingredients: Sterile deionized water is added to a low-speed stirred reactor. Under stirring at 300-400 r / min, environmentally friendly dispersant, environmentally friendly defoamer and water-based water-repellent agent are added in sequence. Stir for 5-8 min until completely dissolved to obtain water-based additive base liquid. S2. Powder dispersion modification: Add ultrafine silica powder, activated kaolin, nano silica and composite inorganic pigment to the base liquid in batches, with a 2-minute interval between additions. After addition, disperse at high speed of 800-1000 r / min for 20-25 minutes, and then grind in a sand mill until the slurry fineness is ≤30μm. S3. Emulsion compounding: Under low-speed stirring at 400-500r / min, slowly add modified pure acrylic emulsion and nano silica sol to the powder slurry. The adding time is 15-20min. Stir for 10min after the addition is complete. S4. Fine-tuning the molding process with additives: Add environmentally friendly leveling agent and environmentally friendly film-forming aid, stir for 5-10 minutes, and fine-tune the viscosity of the slurry to the standard range; S5. Filtration and Packaging: Filter with a 200-mesh filter, let stand to defoam for 30 minutes, and seal at room temperature to obtain the finished coating.

9. The preparation method according to claim 8, characterized in that, The entire preparation process is carried out at room temperature and pressure, with no waste gas, wastewater, or waste residue emissions, making the production process green and environmentally friendly.

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