Air-permeable waterproof and decorative integrated coating for outer wall, and preparation method and application thereof

Abstract

This invention relates to the field of coating technology, and proposes a breathable integrated waterproof and decorative coating for exterior walls, its preparation method, and its application. The breathable integrated waterproof and decorative coating for exterior walls comprises the following raw materials: water, acrylate / SiO2 hybrid emulsion, hydrophobic reinforcing filler, silicate, and porous breathable filler. The addition of acrylate / SiO2 hybrid emulsion to the breathable integrated waterproof and decorative coating provided by this invention significantly improves the tensile strength, adhesion strength, and weather resistance of the coating, solving the problems of poor durability and easy cracking and peeling of existing integrated waterproof and decorative coatings.

Description

Technical Field

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

[0002] Building exterior walls are constantly exposed to the natural environment, affected by wind, sun, high and low temperatures, making them prone to cracking and water seepage, severely impacting the building's lifespan. When the external wall insulation system leaks or seeps, if its permeability is poor, moisture diffusion is hindered. This has several consequences: first, it prevents moisture from dissipating from the wall, affecting the color of the finish paint; second, it creates stress, causing the paint film to blister and peel off; and third, it leads to a gradual increase in the wall's moisture content, resulting in condensation and adversely affecting the wall's thermal and structural properties.

[0003] Therefore, in the design and construction of external wall insulation systems, water repellency and breathability are the core requirements for achieving excellent insulation effects and ensuring the long-term stable operation of the system. According to the provisions of GB 55030-2022 "General Specification for Waterproofing of Buildings and Municipal Engineering", for building external wall insulation systems, frame-filled or masonry structure external walls with a waterproofing grade of Class I should be provided with two or more waterproof layers. When a two-layer waterproofing structure is adopted, one layer of waterproof mortar and one layer of waterproof coating or other waterproofing material should be installed. In practical engineering, the waterproof design of external wall insulation systems needs to take into account both the base wall and the outer side of the insulation layer to achieve long-term waterproofing. Currently, there are technical solutions on the market that apply breathable polymer waterproof coatings to the outer side of the insulation layer. This solution improves the waterproof safety of external wall insulation systems to a certain extent, but it only takes into account the waterproofing requirements and requires an additional finishing layer, which increases the construction process and costs. Another solution is to integrate the waterproof layer and the finishing layer into a whole, thereby reducing the number of construction layers on the exterior wall and improving the waterproofing and safety of the exterior wall system at the same time. Based on this, integrated waterproof and decorative coatings have emerged.

[0004] However, existing waterproof and decorative integrated coatings still have significant shortcomings. Their tensile strength and adhesion strength are relatively low, making them prone to cracking and peeling. They are also unable to withstand long-term erosion from the natural environment and cannot fully meet the long-term stable operation requirements of external wall insulation systems. Therefore, developing a waterproof and decorative integrated coating with high tensile strength and good adhesion performance is of great significance. Summary of the Invention

[0005] To address the above technical problems, this invention provides a breathable integrated waterproof and decorative coating for exterior walls, its preparation method, and its application. The breathable integrated waterproof and decorative coating for exterior walls provided by this invention incorporates an acrylic ester / SiO2 hybrid emulsion, which significantly improves the tensile strength, adhesion strength, and weather resistance of the coating, solving the problems of poor durability and easy cracking and peeling of existing integrated waterproof and decorative coatings.

[0006] The specific technical solution of the present invention is as follows: According to one aspect of the present invention, a breathable exterior wall waterproof and decorative integrated coating is provided, comprising the following raw materials: water, acrylate / SiO2 hybrid emulsion, hydrophobic reinforcing filler, silicate and porous breathable filler.

[0007] In the above technical solution, the breathable exterior wall waterproof and decorative integrated coating includes the following raw materials in parts by weight: 5-30 parts water, 25-55 parts acrylate / SiO2 hybrid emulsion, 5-30 parts hydrophobic reinforcing filler, 5-10 parts silicate, and 10-50 parts porous breathable filler.

[0008] In the above technical solution, the breathable exterior wall waterproof and decorative integrated coating includes the following raw materials in parts by weight: 5-30 parts water, 34-55 parts acrylate / SiO2 hybrid emulsion, 5-30 parts hydrophobic reinforcing filler, 5-10 parts silicate, and 10-30 parts porous breathable filler.

[0009] In the above technical solution, the mass ratio of acrylate emulsion to SiO2 in the acrylate / SiO2 hybrid emulsion is 3~8:1; Preferably, in the acrylate / SiO2 hybrid emulsion, the mass ratio of acrylate emulsion to SiO2 is 6~8:1.

[0010] In the above technical solution, the hydrophobic reinforcing filler includes hydrophobic fumed silica, hydrophobic nano-calcium carbonate, hydrophobic titanium dioxide, calcium stearate, hydrophobic talc powder, hydrophobic mica powder, and hydrophobic precipitated silica.

[0011] In the above technical solution, the silicate includes one or more of calcium silicate, potassium fluorosilicate, potassium methylsilicate, calcite, magnesium aluminum silicate, potassium ethylsilicate, sodium methylsilicate, and sodium ethylsilicate.

[0012] In the above technical solution, the porous breathable filler includes one or more of aerogel, molecular sieve, sepiolite, volcanic ash and wood fiber.

[0013] In the above technical solution, the preparation method of the acrylate / SiO2 hybrid emulsion includes the following steps: S1. Mix acrylic emulsion and nonionic surfactant to obtain pre-dispersion A; S2. Mix the predispersant A with the silane coupling agent to obtain predispersant B; S3. Mix hydrochloric acid and ethanol to obtain a mixture. After mixing the pre-dispersion B and the mixture once, add tetrabutyl silicate and mix a second time to obtain the acrylate / SiO2 hybrid emulsion.

[0014] In the above technical solution, the nonionic surfactant includes one or more of lauryl alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether, methyl coconut oil polyoxyethylene ether, and fatty acid polyoxyethylene ether.

[0015] In the above technical solution, the silane coupling agent includes any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, cyclohexyltrimethoxysilane, methyltrimethoxysilane, and γ-aminopropyltriethoxysilane.

[0016] In the above technical solution, the porous permeable filler is a modified porous permeable filler; the modified porous permeable filler is obtained by coating the porous permeable filler with a silicate solution.

[0017] In the above technical solution, the silicate solution includes any one of sodium silicate solution, potassium silicate solution and lithium silicate solution.

[0018] In the above technical solution, the mass ratio of the porous breathable filler to the silicate solution is 80~100:10~50.

[0019] In the above technical solution, the breathable exterior wall waterproof and decorative integrated coating also includes the following raw materials: dispersant, defoamer, and thickener.

[0020] According to another aspect of the present invention, the present invention also provides a method for preparing the above-mentioned breathable exterior wall waterproof and decorative integrated coating, comprising the following steps: After mixing water and breathable materials, acrylate / SiO2 hybrid emulsion, hydrophobic reinforcing filler, and silicate are added in sequence and stirred thoroughly to obtain the breathable exterior wall waterproof and decorative integrated coating.

[0021] According to yet another aspect of the present invention, the present invention also provides the application of the above-mentioned breathable exterior wall waterproof and decorative integrated coating in the waterproof and decorative application of building exterior walls.

[0022] Compared with existing technologies, this invention provides a breathable, integrated waterproof and decorative coating for exterior walls. First, this invention adds an acrylic ester / SiO2 hybrid emulsion to the coating. This hybrid emulsion not only enables the coating to form a strong interfacial bond with the exterior wall substrate, effectively improving the adhesion strength between the coating and the substrate, but also significantly enhances the density and mechanical properties of the emulsion film after formation. This results in a coating with excellent tensile strength after curing, allowing the coating to withstand stress generated during long-term use, thereby reducing the risk of coating cracking. Second, the coating of this invention is a single-component, integrated waterproof and decorative coating that is ready to use immediately after opening the can and is convenient to apply. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention more apparent, the invention is described in detail below. It should be understood that the invention is not limited to the description herein.

[0024] Hydrophobic reinforcing filler The hydrophobic reinforcing filler used in this invention is a known hydrophobic reinforcing filler for use in coatings, and this invention is not limited to the specific examples listed below. As an example, the hydrophobic reinforcing filler may be one or more of the following: hydrophobic fumed silica, hydrophobic nano-calcium carbonate, hydrophobic titanium dioxide, calcium stearate, hydrophobic talc, hydrophobic mica powder, and hydrophobic precipitated silica. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the function of the hydrophobic reinforcing filler is to improve the density of the coating, thereby ensuring the mechanical strength and water resistance of the coating, reducing coating cracking and chalking, and enhancing the durability of the coating.

[0025] silicates The silicate used in this invention is a silicate known in the art for use in coatings, and the invention is not limited to the specific examples listed below. As an example, the silicate may be one or more of calcium silicate, potassium fluorosilicate, potassium methylsilicate, ettringite, magnesium aluminum silicate, potassium ethylsilicate, sodium methylsilicate, and sodium ethylsilicate. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the silicate functions synergistically with the acrylate / SiO2 hybrid emulsion and modified porous breathable filler to enhance the tensile strength of the coating. Simultaneously, it can undergo an interfacial reaction with the concrete substrate, effectively strengthening the bond strength between the coating and the concrete substrate.

[0026] Porous breathable packing The porous breathable filler used in this invention is a known porous breathable filler for use in coatings, and this invention is not limited to the specific examples listed below. As an example, the porous breathable filler can be one or more of aerogel, molecular sieve, sepiolite, volcanic ash, wood fiber, diatomaceous earth, expanded perlite, attapulgite, and zeolite powder. The particle size of each porous breathable filler is independently 300-2000 mesh; as an example, the particle size can be any one or more of 300 mesh, 500 mesh, 800 mesh, 1250 mesh, 1500 mesh, and 2000 mesh. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the function of the porous breathable filler is to construct continuous, interconnected microporous channels within the coating, giving the coating excellent water vapor permeability without compromising its waterproofness.

[0027] dispersant The dispersant used in this invention is a known dispersant for use in coatings, and this invention is not limited to the sodium polycarboxylate dispersants listed below. As an example, the dispersant may be one or more of sodium polycarboxylate dispersants, sodium polyacrylate dispersants, ammonium salt dispersants of acrylic copolymers, and phosphate dispersants. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the dispersant's role is to fully wet and disperse solid particles such as hydrophobic reinforcing fillers and porous breathable fillers in the system, preventing particle agglomeration and sedimentation, improving the stability and uniformity of the coating system, and ensuring a smooth and delicate coating surface.

[0028] Defoamer The defoamer used in this invention is a known defoamer for use in coatings, and this invention is not limited to the mineral oil defoamers listed below. As an example, the defoamer may be one or more of mineral oil defoamers, silicone defoamers, polyether defoamers, and higher alcohol defoamers. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the defoamer's function is to suppress the generation of bubbles during coating preparation, quickly eliminate bubbles in the system, avoid surface defects such as pinholes, craters, and fisheyes in the coating, and ensure a dense and smooth coating.

[0029] Thickener The thickener used in this invention is a known thickener for use in coatings, and this invention is not limited to the polyurethane thickeners listed below. As an example, the thickener may be one or more of polyurethane thickeners, polyacrylic acid alkali-swellable thickeners, hydroxyethyl cellulose, and hydroxypropyl cellulose. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the thickener functions to adjust the viscosity and thixotropic properties of the coating system, improve the stability of the coating system, prevent filler sedimentation, ensure uniform and smooth spraying and roller coating, and also make the coating more uniform and dense after forming.

[0030] silicate solution The silicate solution used in this invention is a silicate solution known in the art for use in filler modification, and this invention is not limited to the specific examples listed below. As an example, the silicate solution can be one or more of sodium silicate solution, potassium silicate solution, and lithium silicate solution with a modulus of 4.8 to 5.8. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the silicate solution serves to modify the surface of the porous breathable filler by coating it with an inorganic silicate coating layer, thereby reducing the water absorption of the porous breathable filler while preserving and optimizing the microporous channel structure inside the coating, further improving the water vapor permeability of the coating. Furthermore, after the porous breathable filler is modified by coating with silicate solution, the modified porous breathable filler can synergistically react with the acrylate / SiO2 hybrid emulsion and silicate to undergo a chemical cross-linking reaction on the coating surface, forming a stable macromolecular network structure, thereby giving the coating high tensile strength.

[0031] acrylic emulsion The acrylic emulsion used in this invention is an acrylic emulsion known in the art for use in coatings, and this invention is not limited to the pure acrylic emulsions listed below. As an example, the acrylic emulsion can be any one of pure acrylic emulsion, silicone-acrylic emulsion, and styrene-acrylic emulsion. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the acrylic emulsion serves as the core matrix raw material for preparing the acrylate / SiO2 hybrid emulsion, undergoing a crosslinking reaction with silane coupling agents and tetrabutyl silicate to construct an organic-inorganic composite emulsion system. It can also serve as a basic film-forming component of the coating, participating in subsequent coating curing and film formation, providing basic adhesion, flexibility, and film stability for the coating.

[0032] Nonionic surfactants The nonionic surfactant used in this invention is a known nonionic surfactant in the art that can be used for emulsion hybrid synthesis, and this invention is not limited to lauryl alcohol polyoxyethylene ether listed below. As an example, the nonionic surfactant can be one or more of lauryl alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether, methyl cocoate polyoxyethylene ether, and fatty acid polyoxyethylene ether. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the role of the nonionic surfactant is to effectively emulsify and disperse the acrylic emulsion, improve the system stability, promote the thorough and uniform mixing of the silane coupling agent and the acrylic emulsion, and simultaneously reduce the interfacial tension during the hydrolysis of tetrabutyl silicate, ensuring uniform dispersion of the organic and inorganic phases, thereby forming a stable and uniform acrylate / SiO2 hybrid emulsion.

[0033] Silane coupling agents The silane coupling agent used in this invention is a known silane coupling agent in the art that can be used for emulsion hybrid synthesis, and this invention is not limited to γ-aminopropyltriethoxysilane listed below. As an example, the silane coupling agent can be any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, cyclohexyltrimethoxysilane, methyltrimethoxysilane, and γ-aminopropyltriethoxysilane. In the breathable exterior wall waterproof and decorative integrated coating of this invention, the role of the silane coupling agent is to modify the acrylic emulsion by achieving interfacial bridging between the organic and inorganic phases. The silane coupling agent can chemically bond the acrylic emulsion with the silica generated by the hydrolysis of tetrabutyl silicate, thereby forming a stable and homogeneous acrylate / SiO2 hybrid emulsion.

[0034] Breathable exterior wall waterproof and decorative integrated coating The raw materials of the breathable exterior wall waterproof and decorative integrated coating of the present invention include water, acrylate / SiO2 hybrid emulsion, hydrophobic reinforcing filler, silicate and porous breathable filler.

[0035] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the weight of water is 5 to 30 parts, preferably 10 to 30 parts, more preferably 10 to 20 parts, and most preferably 10 to 12 parts.

[0036] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the weight parts of the acrylic ester / SiO2 hybrid emulsion are 25 to 55 parts, preferably 30 to 50 parts, more preferably 30 to 45 parts, and most preferably 34 to 43 parts.

[0037] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the weight of the hydrophobic reinforcing filler is 5 to 30 parts, preferably 10 to 30 parts, and most preferably 12 to 29 parts.

[0038] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the weight of silicate is 5 to 10 parts, preferably 5 to 8 parts, and most preferably 6 to 8 parts.

[0039] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the weight of porous breathable filler is 10-50 parts, preferably 10-40 parts, more preferably 10-30 parts, and most preferably 10-25 parts.

[0040] The raw materials of the breathable exterior wall waterproof and decorative integrated coating of the present invention also include dispersants, defoamers and thickeners.

[0041] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the weight of the dispersant is 0.1 to 1.0 parts, preferably 0.1 to 0.8 parts, and most preferably 0.2 to 0.5 parts.

[0042] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the weight of the defoamer is 0.1 to 0.5 parts, preferably 0.2 to 0.5 parts, and most preferably 0.3 to 0.4 parts.

[0043] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the thickener has a weight ratio of 0.2 to 1 part, preferably 0.2 to 0.8 parts, more preferably 0.2 to 0.5 parts, and most preferably 0.2 to 0.3 parts.

[0044] In the raw materials of the breathable exterior wall waterproof and decorative integrated coating, the porous breathable filler is a modified porous breathable filler, which is obtained by coating the porous breathable filler with silicate solution. The weight parts of the modified porous breathable filler are 10 to 50 parts, preferably 10 to 40 parts, more preferably 10 to 30 parts, and most preferably 10 to 25 parts.

[0045] Preparation method of modified porous breathable packing The present invention also provides a method for preparing the modified porous permeable packing as described above, comprising: The porous permeable packing is placed in a zero-gravity stirred tank, and a silicate solution is sprayed on the surface of the porous permeable packing. The mixture is stirred and dried to obtain the modified porous permeable packing.

[0046] In the preparation method of modified porous breathable packing, the mass ratio of porous breathable packing to silicate solution is 80~100:10~50.

[0047] In the preparation method of modified porous breathable packing, the stirring and mixing time is 15~30min.

[0048] In the preparation method of modified porous breathable packing, the drying temperature is 150~300℃.

[0049] Preparation method of acrylate / SiO2 hybrid emulsion The present invention also provides a method for preparing the acrylate / SiO2 hybrid emulsion as described above, comprising: S1. Mix acrylic emulsion and nonionic surfactant to obtain pre-dispersion A; S2. Mix predispersant A and silane coupling agent to obtain predispersant B; S3. Mix hydrochloric acid and ethanol to obtain a mixture. After mixing the pre-dispersion B and the mixture once, add tetrabutyl silicate and mix a second time to obtain an acrylate / SiO2 hybrid emulsion.

[0050] In the preparation method of acrylate / SiO2 hybrid emulsion, the mass ratio of acrylic emulsion to nonionic surfactant is 70~100:0.1~1, preferably 90~100:0.3~0.5.

[0051] In the preparation method of acrylate / SiO2 hybrid emulsion, the mass ratio of predispersant A to silane coupling agent is 80~100:1~5, preferably 90~100:1~4, more preferably 90~100:1~2, and most preferably 90~100:1.8~2.

[0052] In the preparation method of acrylate / SiO2 hybrid emulsion, the mass ratio of hydrochloric acid to ethanol is 1:0.5~2, preferably 1:0.5~1, and most preferably 1:1.

[0053] In the preparation method of acrylate / SiO2 hybrid emulsion, the mass ratio of predispersant B, mixture and tetrabutyl silicate is 90~100:0.5~1.5:10~20, preferably 90~100:0.5~1:10~18, and most preferably 90~100:0.5~0.8:12~15.

[0054] In the preparation method of acrylate / SiO2 hybrid emulsion, the temperatures for primary mixing and secondary mixing are independently 20~40℃, preferably 30~35℃.

[0055] In the preparation method of acrylate / SiO2 hybrid emulsion, the first mixing time is 10~15 min, and the second mixing time is 1~2 h.

[0056] Preparation method of breathable exterior wall waterproof and decorative integrated coating This invention also provides a method for preparing the breathable exterior wall waterproof and decorative integrated coating as described above, comprising: After mixing water, dispersant, defoamer, and breathable materials, acrylate / SiO2 hybrid emulsion, hydrophobic reinforcing filler, silicate, and thickener are added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating.

[0057] To further illustrate the present invention, the following examples will provide a detailed description. All raw materials used in the following examples and comparative examples of the present invention are commercially available products. Specifically, the pure acrylic emulsion is Zhixing emulsion, model 635; the concentration of hydrochloric acid is 1 mol / L; the sodium polycarboxylate dispersant is model 731A; the mineral oil defoamer is model NXZ; and the polyurethane thickener is model 8W.

[0058] Example 1 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 12 parts water, 0.3 parts sodium polycarboxylate dispersant, 0.3 parts mineral oil defoamer, and 25 parts sepiolite were added to a kettle and mixed. Then, 36 parts acrylate / SiO2 hybrid emulsion, 23 parts hydrophobic titanium dioxide, 6 parts potassium ethyl silicate, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation method of the acrylate / SiO2 hybrid emulsion includes: S1. Mix 100 parts of acrylic emulsion and 0.5 parts of lauryl alcohol polyoxyethylene ether and emulsify and disperse to obtain pre-dispersion A; S2. Add 2 parts of γ-aminopropyltriethoxysilane to 100 parts of predisperse A and stir for 1 hour to obtain predisperse B; S3. Mix hydrochloric acid and ethanol at a mass ratio of 1:1 to obtain a mixture. Under stirring conditions, add 90 parts of predispersant B to the reactor and add 0.5 parts of the mixture. Mix for 10 minutes at a time. Then, add 12 parts of tetrabutyl silicate dropwise to the reactor. The addition is completed in 2 hours. Mix again at 30°C for 2 hours to obtain an acrylate / SiO2 hybrid emulsion, wherein the mass ratio of acrylate emulsion to SiO2 is 8:1.

[0059] Example 2 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: Five parts water, 0.1 parts sodium polycarboxylate dispersant, 0.1 parts mineral oil defoamer, and 10 parts sepiolite were added to a kettle and mixed. Then, 34 parts acrylate / SiO2 hybrid emulsion, 5 parts hydrophobic titanium dioxide, 5 parts potassium ethyl silicate, and 0.2 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation method of the acrylate / SiO2 hybrid emulsion includes: S1. Mix 90 parts of acrylic emulsion and 0.3 parts of lauryl alcohol polyoxyethylene ether and emulsify and disperse to obtain pre-dispersion A; S2. Add 1.8 parts of γ-aminopropyltriethoxysilane to 90 parts of predispersion A, stir for 1 hour to obtain predispersion B; S3. Mix hydrochloric acid and ethanol at a mass ratio of 1:1 to obtain a mixture. Under stirring conditions, add 100 parts of predispersant B to the reactor and add 0.8 parts of the mixture. Mix for 15 minutes at a time. Then, add 15 parts of tetrabutyl silicate dropwise to the reactor. The addition is completed in 2 hours. Stir and mix at 35°C for 2 hours to obtain an acrylate / SiO2 hybrid emulsion, wherein the mass ratio of acrylate emulsion to SiO2 is 6:1.

[0060] Example 3 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 30 parts water, 1 part sodium polycarboxylate dispersant, 0.5 parts mineral oil defoamer, and 30 parts sepiolite were added to a kettle and mixed. Then, 55 parts acrylate / SiO2 hybrid emulsion, 30 parts hydrophobic titanium dioxide, 10 parts potassium ethyl silicate, and 1 part polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 2.

[0061] Example 4 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 12 parts water, 0.3 parts sodium polycarboxylate dispersant, 0.3 parts mineral oil defoamer, and 25 parts modified sepiolite were added to a kettle and mixed. Then, 36 parts acrylate / SiO2 hybrid emulsion, 23 parts hydrophobic titanium dioxide, 6 parts potassium ethyl silicate, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation methods for modified sepiolite and acrylate / SiO2 hybrid emulsions are as follows: Methods for preparing modified sepiolite include: 100 parts of sepiolite were put into a zero-gravity stirred tank, and then 20 parts of potassium silicate solution were sprayed on its surface. The mixture was stirred for 20 minutes and then dried at 200°C to obtain modified sepiolite. The modulus of the potassium silicate solution was 4.8. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 1.

[0062] Example 5 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 12 parts water, 0.3 parts sodium polycarboxylate dispersant, 0.3 parts mineral oil defoamer, and 25 parts modified aerogel were added to a kettle and mixed. Then, 38 parts acrylate / SiO2 hybrid emulsion, 20 parts hydrophobic titanium dioxide, 5 parts ettringite, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation methods for modified aerogels and acrylate / SiO2 hybrid emulsions are as follows: Methods for preparing modified aerogels include: 100 parts of aerogel were put into a zero-gravity stirred tank, and then 20 parts of potassium silicate solution were sprayed on its surface. The mixture was stirred for 20 minutes and then dried at 200°C to obtain modified aerogel. The modulus of the potassium silicate solution was 5.8. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 1.

[0063] Example 6 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 10 parts water, 0.4 parts sodium polycarboxylate dispersant, 0.4 parts mineral oil defoamer, and 10 parts modified molecular sieve were added to a kettle and mixed. Then, 42 parts acrylate / SiO2 hybrid emulsion, 29 parts hydrophobic nano calcium carbonate, 10 parts calcium silicate, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation methods for modified molecular sieves and acrylate / SiO2 hybrid emulsions are as follows: Methods for preparing modified molecular sieves include: 90 parts of molecular sieve were put into a zero-gravity stirred tank, and then 15 parts of sodium silicate solution were sprayed on its surface. The mixture was stirred for 16 minutes and then dried at 180°C to obtain modified molecular sieve, wherein the modulus of sodium silicate solution was 5.6. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 1.

[0064] Example 7 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 11 parts water, 0.5 parts sodium polycarboxylate dispersant, 0.4 parts mineral oil defoamer, and 30 parts modified sepiolite were added to a kettle and mixed. Then, 35 parts acrylate / SiO2 hybrid emulsion, 17 parts calcium stearate, 7 parts potassium fluorosilicate, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation methods for modified sepiolite and acrylate / SiO2 hybrid emulsions are as follows: Methods for preparing modified sepiolite include: 100 parts of sepiolite were put into a zero-gravity stirred tank, and then 25 parts of lithium silicate solution were sprayed on its surface. The mixture was stirred for 20 minutes and then dried at 220°C to obtain modified sepiolite. The modulus of the lithium silicate solution was 5.0. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 1.

[0065] Example 8 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 10 parts water, 0.3 parts sodium polycarboxylate dispersant, 0.3 parts mineral oil defoamer, and 30 parts modified wood fiber were added to a kettle and mixed. Then, 43 parts acrylate / SiO2 hybrid emulsion, 12 parts hydrophobic fumed silica, 6 parts magnesium aluminum silicate, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation method of modified wood fiber and acrylate / SiO2 hybrid emulsion is as follows: Methods for preparing modified wood fibers include: 100 parts of wood fiber were put into a zero-gravity stirring vessel, and then 18 parts of potassium silicate solution were sprayed on its surface. The mixture was stirred for 15 minutes and then dried at 200°C to obtain modified wood fiber. The modulus of the potassium silicate solution was 4.8. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 1.

[0066] Example 9 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 10 parts water, 0.2 parts sodium polycarboxylate dispersant, 0.4 parts mineral oil defoamer, and 29 parts modified volcanic ash were added to a kettle and mixed. Then, 34 parts acrylate / SiO2 hybrid emulsion, 20 parts hydrophobic nano calcium carbonate, 8 parts potassium methylsilicate, and 0.2 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation method of the modified volcanic ash and acrylate / SiO2 hybrid emulsion is as follows: Methods for preparing modified pozzolanic include: 100 parts of volcanic ash were put into a zero-gravity stirred tank, and then 20 parts of lithium silicate solution were sprayed on its surface. The mixture was stirred for 20 minutes and then dried at 200°C to obtain modified volcanic ash. The modulus of the lithium silicate solution was 5.8. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 1.

[0067] Comparative Example 1 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 12 parts water, 0.3 parts sodium polycarboxylate dispersant, 0.3 parts mineral oil defoamer, and 25 parts modified sepiolite were added to a kettle and mixed. Then, 36 parts pure acrylic emulsion, 23 parts hydrophobic titanium dioxide, 6 parts potassium ethyl silicate, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation method of modified sepiolite includes: 100 parts of sepiolite were put into a zero-gravity stirred tank, and then 20 parts of potassium silicate solution were sprayed on its surface. The mixture was then stirred for 20 minutes and dried at 200°C to obtain modified sepiolite, wherein the modulus of the potassium silicate solution was 4.8.

[0068] Comparative Example 2 A method for preparing a breathable, integrated waterproof and decorative coating for exterior walls includes: 12 parts water, 0.3 parts sodium polycarboxylate dispersant, 0.3 parts mineral oil defoamer, and 25 parts modified sepiolite were added into a kettle and mixed. Then, 36 parts acrylate / SiO2 hybrid emulsion, 23 parts hydrophobic titanium dioxide, and 0.3 parts polyurethane thickener were added in sequence and stirred thoroughly to obtain a breathable exterior wall waterproof and decorative integrated coating. The preparation methods for modified sepiolite and acrylate / SiO2 hybrid emulsions are as follows: Methods for preparing modified sepiolite include: 100 parts of sepiolite were put into a zero-gravity stirred tank, and then 20 parts of potassium silicate solution were sprayed on its surface. The mixture was stirred for 20 minutes and then dried at 200°C to obtain modified sepiolite. The modulus of the potassium silicate solution was 4.8. The preparation method of the acrylate / SiO2 hybrid emulsion is the same as in Example 1.

[0069] Performance testing The following properties were determined using the group standard T / HBBWA 25-2024 "Integrated Waterproof and Decorative Coating for Exterior Walls (High Weather Resistance)". The performance of each example and comparative example is shown in Tables 1 to 3.

[0070] Table 1 Test results of Examples 1-4

[0071] Table 2 Test results of Examples 5-8

[0072] Table 3 Test results of Example 9 and Comparative Examples 1-2

[0073] The only difference between Example 4 and Comparative Example 1 is that Example 4 incorporates the addition of a pure acrylic emulsion instead of the acrylate / SiO2 hybrid emulsion used in Comparative Example 1. As can be seen from the data in Tables 1 and 3, the tensile strength and adhesive strength of the coating obtained in Example 4 are higher than those in Comparative Example 1. This indicates that by adding an acrylate / SiO2 hybrid emulsion to the coating, the tensile strength and adhesive strength of the coating can be improved.

[0074] Examples 1-3 incorporated acrylate / SiO2 hybrid emulsion, silicate, and breathable filler into the coating. Examples 4-9 replaced the breathable filler with a modified breathable filler. Comparative Example 1 replaced the acrylate / SiO2 hybrid emulsion with pure acrylic emulsion. Comparative Example 2 did not incorporate silicate. As can be seen from the data in Tables 1-3, the coatings obtained in Examples 4-9 exhibited the highest tensile strength, the highest water vapor permeability, and the lowest water absorption. This indicates that the synergistic effect of incorporating acrylate / SiO2 hybrid emulsion, silicate, and modified breathable filler into the coating can improve the tensile strength, breathability, and water resistance of the coating.

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A breathable, waterproof, and decorative integrated coating for exterior walls, characterized in that, The raw materials include: water, acrylate / SiO2 hybrid emulsion, hydrophobic reinforcing filler, silicate and porous breathable filler.

2. The breathable exterior wall waterproof and decorative integrated coating according to claim 1, characterized in that, The raw materials include the following parts by weight: 5-30 parts water, 25-55 parts acrylate / SiO2 hybrid emulsion, 5-30 parts hydrophobic reinforcing filler, 5-10 parts silicate, and 10-50 parts porous and breathable filler.

3. The breathable exterior wall waterproof and decorative integrated coating according to claim 2, characterized in that, In the acrylate / SiO2 hybrid emulsion, the mass ratio of acrylate emulsion to SiO2 is 3~8:

1.

4. The breathable exterior wall waterproof and decorative integrated coating according to claim 1, characterized in that, The hydrophobic reinforcing filler includes hydrophobic fumed silica, hydrophobic nano-calcium carbonate, hydrophobic titanium dioxide, calcium stearate, hydrophobic talc, hydrophobic mica powder, and hydrophobic precipitated silica. The silicate includes one or more of calcium silicate, potassium fluorosilicate, potassium methylsilicate, ettringite, magnesium aluminum silicate, potassium ethylsilicate, sodium methylsilicate, and sodium ethylsilicate. The porous breathable filler includes one or more of aerogel, molecular sieve, sepiolite, volcanic ash and wood fiber.

5. The breathable exterior wall waterproof and decorative integrated coating according to claim 1, characterized in that, The preparation method of the acrylate / SiO2 hybrid emulsion includes the following steps: S1. Mix acrylic emulsion and nonionic surfactant to obtain pre-dispersion A; S2. Mix the predispersant A with the silane coupling agent to obtain predispersant B; S3. Mix hydrochloric acid and ethanol to obtain a mixture. After mixing the pre-dispersion B and the mixture once, add tetrabutyl silicate and mix a second time to obtain the acrylate / SiO2 hybrid emulsion.

6. The breathable exterior wall waterproof and decorative integrated coating according to claim 5, characterized in that, The nonionic surfactant includes one or more of lauryl alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether, methyl cocoate polyoxyethylene ether, and fatty acid polyoxyethylene ether. The silane coupling agent includes any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, cyclohexyltrimethoxysilane, methyltrimethoxysilane, and γ-aminopropyltriethoxysilane.

7. The breathable exterior wall waterproof and decorative integrated coating according to claim 1, characterized in that, The porous permeable filler is a modified porous permeable filler; the modified porous permeable filler is obtained by coating the porous permeable filler with a silicate solution; The silicate solution includes any one of sodium silicate solution, potassium silicate solution and lithium silicate solution; The mass ratio of the porous breathable filler to the silicate solution is 80~100:10~50.

8. The breathable exterior wall waterproof and decorative integrated coating according to claim 1, characterized in that, It also includes the following ingredients: dispersant, defoamer and thickener.

9. A method for preparing a breathable, waterproof, and decorative integrated coating for exterior walls, used to prepare the breathable, waterproof, and decorative integrated coating for exterior walls as described in claim 1, characterized in that, Includes the following steps: After mixing water and breathable materials, acrylate / SiO2 hybrid emulsion, hydrophobic reinforcing filler, and silicate are added in sequence and stirred thoroughly to obtain the breathable exterior wall waterproof and decorative integrated coating.

10. The application of a breathable integrated waterproof and decorative coating for exterior walls according to any one of claims 1 to 8, or a breathable integrated waterproof and decorative coating for exterior walls prepared by the method of claim 9, in the waterproof and decorative application of building exterior walls.

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