Coating composition as well as preparation method and application thereof

Abstract

The invention discloses a coating composition as well as a preparation method and application thereof, and relates to the technical field of coatings. The coating composition comprises basic paint, protective glue and a continuous phase, the base paint comprises hydrophobic modified hydroxyethyl cellulose and hydroxyethyl cellulose; the protective glue comprises layered silicate; the continuous phase comprises a silicone-acrylic emulsion synthesized by core-shell emulsion polymerization and a silicone-acrylic emulsion synthesized by microemulsion polymerization. According to the coating composition, through matching of specific components, the embossment effect with coexisting colorful points is achieved, the problems that a traditional embossment effect coating is single in color and tedious in construction are solved, and meanwhile the phenomenon that a paint film of a traditional colorful coating becomes white and soft when meeting water is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly relates to a coating composition, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous development of science and technology and social productivity, people's material living standards have been increasing day by day, and people's requirements for building exterior wall decoration have also become higher and higher. In the aspect of architectural coatings, exterior wall decorative coatings have developed from the single latex paint in the past to relief paints, real stone paints, sand glue paints, etc. with complex texture levels, as well as colorful coatings with rich and changeable colors. However, the current relief effect coatings have problems such as single color, weak texture, and high consumption, which are difficult to meet people's requirements for building decoration, and there are also problems of relatively high costs.

[0003] In order to meet the requirements of rich and diverse exterior wall colors and strong texture effects, currently on construction sites, only by combining multiple coatings, multiple construction processes, and increasing labor costs can an ideal relief effect be presented, resulting in cumbersome construction. And due to high requirements for texture effects, the consumption of coatings used cannot be reduced, further increasing the load on the wall. Traditional colorful coatings, such as water-in-water colorful coatings, although they can present colorful effects, have problems such as easy breakage of color dots and becoming white, soft, and loose when encountering water. At the same time, there are fewer aggregates in the materials of the water-in-water colorful technology, making it difficult to present a relief effect. And traditional water-in-water color dots are greatly affected by air pressure and are easy to open and flatten. Even if a relief effect can be presented, the texture of its relief effect is relatively poor. In order to present the effects of texture and colorfulness, using water-in-water coatings also requires construction by combining multiple coatings, and the problem of cumbersome construction cannot be solved. Summary of the Invention

[0004] The present invention aims to at least solve the above-mentioned technical problems existing in the prior art. For this reason, the object of the present invention is to provide a coating composition to achieve a relief effect with coexisting colorful dots, overcome the problems of single color and cumbersome construction of traditional relief effect coatings, and at the same time avoid the phenomenon of the paint film becoming white and soft when encountering water in traditional colorful coatings.

[0005] The second aspect of the present invention lies in providing a preparation method of a coating composition.

[0006] The third aspect of the present invention lies in providing an aqueous colorful relief paint.

[0007] The fourth aspect of the present invention lies in providing an application of a coating composition.

[0008] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0009] The first aspect of the present invention provides a coating composition, comprising a base paint, a protective colloid, and a continuous phase;

[0010] The base paint includes cellulose, and the cellulose includes hydrophobically modified hydroxyethyl cellulose and hydroxyethyl cellulose;

[0011] The protective colloid includes layered silicate;

[0012] The continuous phase includes an emulsion, and the emulsion includes a silicone-acrylic emulsion synthesized by core-shell emulsion polymerization and a silicone-acrylic emulsion synthesized by microemulsion polymerization.

[0013] The coating composition of the present invention belongs to a water-in-water multicolor paint. By using a protective colloid containing layered silicate, the interlayer cations thereof react with the hydroxyl groups in the hydroxyethyl cellulose in the base paint to form a gel-like protective layer covering the surface of the water-in-water color dots, achieving the coexistence of multiple color dots. When used as a relief paint, it can solve the problems of single color, cumbersome construction, and high construction consumption of traditional relief paints. At the same time, in the base paint, the present invention uses hydrophobically modified hydroxyethyl cellulose in combination with hydroxyethyl cellulose. It has a large molecular weight and a low molar substitution degree, which can effectively improve the consistency after the product is formed. Moreover, its hydrophobic groups can associate with emulsion particles, improving its cohesion, making the color dots change from flat to thick in texture and not easy to shrink, presenting a strong-textured relief effect, and can jointly form a dense protective film with hydroxyethyl cellulose to improve the anti-color bleeding ability. Through the combination of the two celluloses in the base paint, the relief effect can still be presented after removing the sand and gravel in the traditional relief paint, reducing ore mining, and reducing the consumption to one-third of the original, achieving the purpose of light weight and environmental protection.

[0014] In the continuous phase of the present invention, a silicone-acrylic emulsion synthesized by core-shell emulsion polymerization technology and a silicone-acrylic emulsion synthesized by microemulsion polymerization technology are used in combination. Among them, the silicone-acrylic emulsion obtained by core-shell emulsion polymerization has a stable internal charge arrangement and can crosslink with external hydrophobic groups, enabling the system to reach the required viscosity in a short time, with high storage stability, which is beneficial to reducing the use of hydrophilic raw materials (such as thickeners). At the same time, by using a silicone-acrylic emulsion synthesized by microemulsion polymerization technology with a small particle size and high transparency in combination, the water whitening resistance of the coating can be significantly improved, solving the problems of white and soft paint films of traditional multicolor paints when exposed to water.

[0015] Preferably, the mass ratio of the hydrophobically modified hydroxyethyl cellulose to the hydroxyethyl cellulose is 1:(1 - 4).

[0016] More preferably, the mass ratio of the hydrophobically modified hydroxyethyl cellulose to the hydroxyethyl cellulose is 1:(1 - 3.5).

[0017] Specifically, the mass ratio of the hydrophobically modified hydroxyethyl cellulose to the hydroxyethyl cellulose can be 1:1, 1:2, 1:2.5, 1:3.5 or 1:4.

[0018] Preferably, the mass ratio of the silicone-acrylic emulsion synthesized by core-shell emulsion polymerization to the silicone-acrylic emulsion synthesized by microemulsion polymerization is 1:(1-3).

[0019] More preferably, the mass ratio of the silicone-acrylic emulsion synthesized by core-shell emulsion polymerization to the silicone-acrylic emulsion synthesized by microemulsion polymerization is 1:(1-2.5).

[0020] Specifically, the mass ratio of the silicone-acrylic emulsion synthesized by core-shell emulsion polymerization to the silicone-acrylic emulsion synthesized by microemulsion polymerization can be 1:1, 1:1.5, 1:2, 1:2.5 or 1:3.

[0021] Preferably, the base paint further comprises an emulsion, a dispersant, an antifreeze, a film-forming aid, a preservative, a defoamer, a thickener, a multifunctional aid, a filler and water.

[0022] Preferably, the protective colloid comprises an aqueous solution of layered silicate.

[0023] Preferably, the continuous phase further comprises an emulsion, an antifreeze, a film-forming aid, a preservative, a defoamer, a thickener, a multifunctional aid and water.

[0024] Preferably, by mass parts, the base paint comprises the following components: 20-40 parts of an emulsion, 0.3-1.5 parts of cellulose, 0.3-1.5 parts of a dispersant, 0.3-1.8 parts of an antifreeze, 1-3 parts of a film-forming aid, 0.2-1 part of a preservative, 0.2-0.8 parts of a defoamer, 0.1-0.8 parts of a thickener, 0.05-0.2 parts of a multifunctional aid, 10-20 parts of a filler, 50-60 parts of water; the cellulose comprises hydrophobically modified hydroxyethyl cellulose and hydroxyethyl cellulose.

[0025] More preferably, by mass parts, the base paint comprises the following components: 25-35 parts of an emulsion, 0.5-1.2 parts of cellulose, 0.5-1.0 parts of a dispersant, 0.5-1.2 parts of an antifreeze, 1.5-3 parts of a film-forming aid, 0.3-0.7 parts of a preservative, 0.3-0.6 parts of a defoamer, 0.2-0.6 parts of a thickener, 0.05-0.15 parts of a multifunctional aid, 10-15 parts of a filler, 50-55 parts of water.

[0026] More preferably, in the base paint, the emulsion comprises a silicone-modified polyacrylate copolymer. The silicone-modified polyacrylate copolymer emulsion has excellent water whiteness resistance and weather resistance. By controlling the charge of the emulsion, the emulsion reacts with the protective colloid, improving the cohesion of the color dots, enhancing the embossed texture effect, making the color dots stable and not easy to shrink.

[0027] Further preferably, in the base paint, the dispersant includes a hydrophobically modified ammonium acrylate dispersant. The hydrophobically modified ammonium acrylate dispersant has good dispersion effect, and after being hydrophobically modified, it has excellent water resistance, improving the early water resistance, scrub resistance and rain mark resistance of the coating film.

[0028] Further preferably, in the base paint, the antifreeze includes an alcohol liquid miscible with water, such as at least one of ethylene glycol and propylene glycol. By mixing with water, the vapor pressure of the cooling water is changed, and the freezing point is greatly reduced, thereby improving the antifreeze ability of the coating.

[0029] Further preferably, in the base paint, the film-forming aid includes an alcohol ester film-forming aid with good compatibility with the emulsion, such as at least one of RunTai dodecyl alcohol ester, Dow COASOL, and Dow COASOL 290. The film-forming aid has good compatibility with the emulsion and high film-forming efficiency.

[0030] Further preferably, in the base paint, the preservative includes at least one of Dow BIOBAN 623A, BTNV2, and Thor AA2316. These preservatives still have broad-spectrum antibacterial activity in a high-pH system, and can quickly kill and long-term inhibit the growth and reproduction of bacteria (such as Gram-positive bacteria and Gram-negative bacteria), molds (such as Aspergillus niger), and yeasts (such as Candida albicans).

[0031] Further preferably, in the base paint, the defoamer includes an inhibitory mineral oil-based defoamer. The defoamer can be added at any stage of the production process, and specifically, at least one of BS-2608 of Bosheng Chemical Industry and ADF 2469 of Hairun Chemical Industry can be selected.

[0032] Further preferably, in the base paint, the thickener includes a hydrophobically modified associative thickener (such as Dow TT615, Dow TT935) and / or a nonionic associative polyurethane thickener (such as Dow DR50). By introducing hydrophobic groups onto the ordinary ASE polymer molecules, association occurs between the same molecules / different molecules to form a micelle structure, achieving good thickening efficiency and improving the sagging, splashing and delamination conditions of the coating. Combining with a nonionic associative polyurethane thickener helps to improve the scrub resistance and leveling property of the coating.

[0033] Further preferably, in the base paint, the filler includes titanium dioxide and / or kaolin. Kaolin has a lamellar structure and a low sieve residue, which helps to improve the crack resistance and scrub resistance of the coating, and at the same time has a high whiteness, which can reduce the dosage of titanium dioxide. Titanium dioxide is preferably rutile crystal structure titanium dioxide, which has high hiding power and high weather resistance.

[0034] Preferably, the mass fraction of the layered silicate in the aqueous solution of layered silicate is 6-9%.

[0035] More preferably, the mass fraction of the layered silicate in the aqueous solution of layered silicate is 7-8%.

[0036] Preferably, by mass parts, the continuous phase comprises the following components: 30-40 parts of emulsion, 1-3 parts of antifreeze, 1-3 parts of film-forming aid, 0.3-1.5 parts of preservative, 0.1-0.4 parts of defoamer, 0.1-0.8 parts of thickener, 0.2-0.8 parts of multifunctional aid, and 50-60 parts of water; the emulsion comprises a silicone-acrylic emulsion synthesized by core-shell emulsion polymerization and a silicone-acrylic emulsion synthesized by microemulsion polymerization.

[0037] More preferably, by mass parts, the continuous phase comprises the following components: 30-40 parts of emulsion, 1.5-3 parts of antifreeze, 1.5-3 parts of film-forming aid, 0.5-1 part of preservative, 0.1-0.3 parts of defoamer, 0.2-0.6 parts of thickener, 0.3-0.6 parts of multifunctional aid, and 55-60 parts of water.

[0038] More preferably, in the continuous phase, the silicone-acrylic emulsion is selected to be a combination of Rossif 5003A and Rossif 7099A.

[0039] More preferably, in the continuous phase, the antifreeze comprises at least one of ethylene glycol and propylene glycol; the film-forming aid comprises an alcohol ester film-forming aid, such as at least one of RunTai dodecyl alcohol ester, Dow COASOL, and Dow COASOL 290; the preservative comprises at least one of Dow BIOBAN 623A, BTNV2, and Thor AA2316; the defoamer comprises an inhibitory mineral oil-based defoamer, such as at least one of BS-2608 from Baisheng Chemical Industry and ADF 2469 from Hairun Chemical Industry; the thickener comprises a hydrophobically modified associative thickener and / or a nonionic associative polyurethane thickener.

[0040] Preferably, the mass ratio of the base paint, the continuous phase, and the protective colloid is (2-4):(1-2):1.

[0041] More preferably, the mass ratio of the base paint, the continuous phase, and the protective colloid is (2-3.5):(1.5-2):1.

[0042] Preferably, the base paint can be color-matched as needed; in the color-matching, a color paste and a protective colloid are added to the base paint; the mass of the color paste is 0-1% of the base paint; the mass of the protective colloid is 3-5% of the base paint.

[0043] The second aspect of the present invention provides a method for preparing the coating composition described in the first aspect of the present invention, comprising the following steps:

[0044] After separately mixing the components of the base paint, the continuous phase, and the protective colloid, the obtained base paint, protective colloid, and continuous phase are then mixed to obtain the coating composition.

[0045] Preferably, the base paint and the protective colloid are first mixed and granulated, and then the continuous phase is added for mixing.

[0046] More preferably, the average diameter of the colored dots obtained by granulation is 5-7 mm.

[0047] The third aspect of the present invention provides an aqueous multicolor relief paint comprising the coating composition described in the first aspect of the present invention.

[0048] The fourth aspect of the present invention is the application of the coating composition described in the first aspect of the present invention or the aqueous multicolor relief paint described in the third aspect of the present invention in the field of architectural decoration.

[0049] Compared with the prior art, the beneficial effects of the present invention are:

[0050] (1) In the coating composition of the present invention, by using hydrophobically modified hydroxyethyl cellulose in the base paint, in addition to the cross-linking of the hydroxyl groups with the protective colloid, the hydrophobic groups can also associate with the emulsion particles, greatly improving the internal cohesion of the colored dots, making them not easily deformed when subjected to external force shear during the granulation process. The colored dots are characterized as round particles. When used in combination with high molecular weight hydroxyethyl cellulose, the "card house" structure formed after cross-linking with the protective colloid is denser, the colored dots are thicker, which can improve the toughness of the colored dots, are not easily spread out during construction, and greatly enhance the texture effect of the colored dots, achieving a strong texture relief effect.

[0051] (2) In the coating composition of the present invention, an emulsion synthesized using core-shell technology is used in the continuous phase, which is beneficial to controlling the charge arrangement of the emulsion particles, quickly reacting with the protective colloid, reaching the required viscosity in a short time, effectively reducing the dosage of the thickener, improving the water whitening resistance of the coating formed by the paint, and enhancing the storage stability of the product. At the same time, an emulsion synthesized by microemulsion polymerization with a small particle size and high transparency is used in combination, so that the formed coating still maintains a high transparency after being wetted, eliminating the problem of water whitening of traditional multicolor paints when exposed to water.

[0052] (3) The coating composition of the present invention can be used as a water-based colorful relief paint for preparing a colorful relief paint film. It has good workability, and the obtained relief effect paint film has a strong texture, without phenomena such as blistering, cracking, pinholes, blistering, and peeling. Moreover, it will not turn white or become soft when exposed to water. This coating composition uses the water-in-water colorful technology. As a water-based colorful relief paint, it solves the problems of single color and the need for multiple construction steps to achieve multiple colors in traditional relief paints. And the water-in-water technology does not contain white sand, which can reduce ore mining, has a low construction consumption, reduces the wall load, and is low-carbon and environmentally friendly. Therefore, both this coating composition and the water-based colorful relief paint prepared therefrom are applicable to the field of architectural decoration. Detailed Embodiments

[0053] The content of the present invention will be further described in detail below through specific examples. The raw materials, reagents, or devices used in the examples and comparative examples can be obtained from conventional commercial channels or by existing technical methods without special instructions. Unless otherwise specified, the test or measurement methods are conventional methods in the art.

[0054] Table 1 Raw Material Descriptions of Examples and Comparative Examples

[0055]

[0056]

[0057] Preparation Example 1

[0058] This preparation example provides base paints with different formulations. The specific formulations are shown in Table 2, and the obtained base paints are denoted as JA1 - JA3, JD1 - JD2. The preparation method of the base paint is as follows:

[0059] Add nine-tenths of the total pure water into the reaction vessel. At a rotation speed of 800 rpm, successively add a dispersant, an antifoaming agent, titanium dioxide, a filler, cellulose, and a multifunctional auxiliary agent. Adjust the rotation speed to 1000 rpm and disperse for 30 min; adjust the rotation speed to 700 rpm, and successively add an emulsion, a film-forming auxiliary agent, and a preservative. Disperse for 5 min each time after adding one raw material and then continue to add; at a rotation speed of 700 rpm, add a thickener and stir for 10 min; add the remaining one-tenth of the pure water and stir for 5 min; obtain the base paint.

[0060] Table 2 Base Paint Formulation Table (parts by mass)

[0061]

[0062]

[0063] Preparation Example 2

[0064] This preparation example provides continuous phases with different formulations. For the specific formulations, refer to Table 3. The obtained continuous phases are denoted as LA1 - LA3 and LD1. The preparation method of the continuous phase is as follows:

[0065] Add pure water into the reactor. At a rotation speed of 600 rpm, successively add the antifreeze, film-forming aid, and multifunctional aid, and disperse for 10 min. At a rotation speed of 600 rpm, successively add the preservative, emulsion, and defoamer. After adding each raw material, disperse for 3 min and then continue to add the next one. At a rotation speed of 800 rpm, add the thickener and stir for 10 min to obtain the continuous phase.

[0066] Table 3 Continuous phase formulation table (parts by mass)

[0067] Raw materials LA1 LA2 LA3 LD1 Pure water 55 55 55 55 Antifreeze 2.5 2.5 2.5 2.5 Film-forming aid 2 2 2 2 Multi-functional additive 0.4 0.4 0.4 0.4 Preservative BIOBAN 623A 0.2 0.2 0.2 0.2 Preservative BTNV2 0.5 0.5 0.5 0.5 Microemulsion polymerization silicone-acrylic emulsion 23 20 25 / Core-shell emulsion polymerization silicone-acrylic emulsion 12 15 10 / Emulsion RS-3866 / / / 35 Defoamer 0.1 0.1 0.1 0.1 Thickener 0.5 0.5 0.5 0.5 Pure water 3.8 3.8 3.8 3.8

[0068] Preparation Example 3

[0069] This preparation example provides a protective colloid which, by mass, includes 92 parts of pure water and 8 parts of layered magnesium silicate lithium. The preparation method of the protective colloid is as follows: Add pure water into the reaction vessel. At a rotation speed of 1200 rpm, add layered magnesium silicate lithium and disperse for 40 min to obtain the protective colloid, which is used in the coating compositions of the examples and comparative examples.

[0070] The following is a detailed description in combination with different examples and comparative examples.

[0071] Examples 1 - 7

[0072] Examples 1 - 7 provide a coating composition, which includes base paints JA1 - JA3, continuous phases LA1 - LA3, and a protective colloid (Preparation Example 3). For the specific formulations, refer to Table 4. The preparation method includes the following steps:

[0073] First, adjust the color of the base paint. Add the color paste (iron red color paste, Nippon) and the protective colloid (Preparation Example 3) into the base paint, and adjust the rotation speed to 1000 rpm and stir for 10 min. According to the ratio in Table 4, successively add the protective colloid and the color-adjusted base paint into the reaction vessel, adjust the rotation speed to 200 rpm, and granulate until the base paint color dots reach a size of 6 mm. Stop the machine and add the continuous phase, and stir evenly to obtain the coating composition. During the color adjustment of the base paint, refer to Table 5 for the dosages of the color paste and the protective colloid.

[0074] Table 4 Coating composition formulation table of examples (parts by mass)

[0075]

[0076] Table 5 Dosages of color paste and protective colloid during the color adjustment of the base paint in examples and comparative examples

[0077] Parts by mass Base paint 95.4 Color paste 0.6 Protective colloid 4

[0078] Note: The base paint can be optionally tinted according to actual needs. The examples of the present invention are only examples of tinting, and the amount of protective colloid used in the tinting process is not included in the amount of protective colloid in the coating composition, that is, not included in the amounts in Table 4.

[0079] Comparative Examples 1 - 6

[0080] Comparative Examples 1 - 6 provide a coating composition, the differences in its formulation from that of Example 1 are shown in Table 6, and the rest are the same as in Example 1; the preparation method is the same as in Example 1.

[0081] Table 6 Formulation Table of Coating Compositions of Comparative Examples (parts by mass)

[0082] Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Comparative example 6 Base paint JA1 / / 50 / / 72 Base paint JD1 50 / / 50 / / Base paint JD2 / 50 / / 50 / Protective colloid (Preparation example 3) 18 18 18 18 18 18 Continuous phase LA1 32 32 / / / 10 Continuous phase LD1 / / 32 32 32 /

[0083] The base paints in Comparative Examples 1 - 6 were also tinted before use, and the tinting method was the same as in Example 1.

[0084] Result Detection

[0085] Using the coating compositions obtained from the above examples and comparative examples as water-based colorful relief paints, spray them on asbestos-free fiber cement slabs that have been brushed with primer for performance testing.

[0086] 1. Applicability: Test according to the method of 6.6 Applicability in "GB / T 9779-2015 Multi-layer Architectural Coatings", and judge based on a dry film > 1 mm and the colored dots being close to the original size.

[0087] 2. Appearance of the coating film: Refer to the method of 6.6 Applicability in "GB / T 9779-2015 Multi-layer Architectural Coatings", and conduct the test according to the same construction parameters (air pressure 0.1 MPa, consumption 0.5 kg / m 2 ).

[0088] 3. Water resistance: Test according to the test conditions of 6.5.13 Water Resistance in "HG / T 4343-2024 Water-based Colorful Architectural Coatings", and judge by immediately comparing the sample taken out when it turns water-white with the non-soaked part.

[0089] The test results are shown in Table 7.

[0090] Table 7 Performance Test Results of Coating Compositions of Examples 1 - 7 and Comparative Examples 1 - 6

[0091]

[0092]

[0093] According to the test results in Table 7, it can be found that the coating composition obtained by using the base paint containing hydrophobically modified hydroxyethyl cellulose and hydroxyethyl cellulose in the present invention, in combination with a protective colloid containing lithium magnesium silicate layered, and introducing a silicone-acrylic emulsion synthesized by microemulsion polymerization and core-shell emulsion polymerization in the continuous phase can be used as a water-based colorful relief paint. It has good workability, smooth gun discharge, low construction difficulty, strong relief effect texture, and no whitening phenomenon, solving the problems of single color and cumbersome construction of existing relief paints, and avoiding the whitening of the paint film of colorful coatings when exposed to water.

[0094] Compared with Comparative Examples 1 to 6, Examples 1 to 7 can improve the hardness of the color dots while maintaining the toughness of the color dots because they simultaneously adopt the base paint, continuous phase and protective colloid of the present invention. Even when the air pressure increases during spraying, it can avoid breaking after colliding with the wall surface and maintain the original state of the color dots, achieving an excellent relief texture effect. Comparing with Comparative Examples 1 and 2 using single cellulose base paint, the texture effect of Example 1 is significantly enhanced, and the texture effect is: Example 1 > Comparative Example 2 > Comparative Example 1. In addition, the combination of different silicone-acrylic emulsions in the continuous phase can control the charge arrangement of the emulsion particles, improve the water whitening resistance performance, and make the continuous phase with excellent water whitening resistance fully cover the surface of the color dots with strong texture, avoiding the whitening phenomenon. Whitening phenomenon: Comparative Example 4 is more obvious than Comparative Example 3, and Comparative Example 5 is more obvious than Comparative Example 1.

[0095] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A coating composition, characterized in that Includes base paint, protective adhesive and continuous phase; The base paint includes cellulose, and the cellulose includes hydrophobically modified hydroxyethyl cellulose and hydroxyethyl cellulose; The protective colloid comprises layered silicate; The continuous phase includes an emulsion, and the emulsion includes a silicone-acrylic emulsion synthesized by core-shell emulsion polymerization and a silicone-acrylic emulsion synthesized by microemulsion polymerization.

2. The coating composition according to claim 1, characterized in that The mass ratio of the hydrophobically modified hydroxyethyl cellulose to the hydroxyethyl cellulose is 1:(1-4); And / or, the mass ratio of the silicone-acrylic emulsion synthesized by the core-shell emulsion polymerization to the silicone-acrylic emulsion synthesized by the microemulsion polymerization is 1:(1-3).

3. The coating composition according to claim 1 or 2, characterized in that The base paint also includes an emulsion, a dispersant, an antifreeze agent, a film-forming aid, a preservative, a defoamer, a thickener, a multifunctional additive, a filler and water; and / or, the protective colloid comprises an aqueous solution of layered silicate; And / or, the continuous phase further comprises an emulsion, an antifreeze agent, a film-forming aid, a preservative, a defoaming agent, a thickener, a multifunctional aid and water.

4. The coating composition according to claim 3, characterized in that The base paint comprises the following components by weight: 20 to 40 parts of emulsion, 0.3 to 1.5 parts of cellulose, 0.3 to 1.5 parts of dispersant, 0.3 to 1.8 parts of antifreeze agent, 1 to 3 parts of film-forming aid, 0.2 to 1 part of preservative, 0.2 to 0.8 parts of defoamer, 0.1 to 0.8 parts of thickener, 0.05 to 0.2 parts of multifunctional additive, 10 to 20 parts of filler, and 50 to 60 parts of water; the cellulose comprises hydrophobically modified hydroxyethyl cellulose and hydroxyethyl cellulose; And / or, in the base paint, the emulsion includes a silicon-modified polyacrylate copolymer.

5. The coating composition according to claim 3, characterized in that The mass fraction of the layered silicate in the layered silicate aqueous solution is 6-9%.

6. The coating composition according to claim 3, characterized in that The continuous phase comprises the following components in parts by mass: 30-40 parts of emulsion, 1-3 parts of antifreeze, 1-3 parts of film-forming aid, 0.3-1.5 parts of preservative, 0.1-0.4 parts of defoaming agent, 0.1-0.8 parts of thickener, 0.2-0.8 parts of multifunctional additive, and 50-60 parts of water; the emulsion comprises a silicone-acrylic emulsion synthesized by core-shell emulsion polymerization and a silicone-acrylic emulsion synthesized by microemulsion polymerization.

7. The coating composition according to claim 1, characterized in that The mass ratio of the base paint, the continuous phase and the protective glue is (2-4):(1-2):

1.

8. A method for preparing the coating composition according to any one of claims 1 to 7, characterized in that: The following steps are involved: The components of the base paint, the continuous phase and the protective glue are mixed separately, and then the obtained base paint, the protective glue and the continuous phase are mixed to obtain the coating composition.

9. A water-based multi-colored relief paint, characterized in that: A coating composition comprising any one of claims 1 to 7.

10. Use of the coating composition according to any one of claims 1 to 7 or the water-based multi-colored relief paint according to claim 9 in the field of architectural decoration.

Images