Anti-cracking colorful decorative coating

Abstract

The invention relates to the technical field of building decoration materials, and particularly discloses an anti-crack colorful decoration coating. The coating comprises 60-70% of a continuous phase, 25-35% of base paint and 5-10% of a granulation solution, the continuous phase comprises a polyurethane-acrylic acid hybrid emulsion and other raw materials; the basic paint comprises silicone acrylic emulsion, sericite powder, toughening fibers, rubber powder and other raw materials; the granulation solution is a magnesium lithium silicate aqueous solution with the viscosity of 2680-3550mPa. S. According to the invention, the continuous phase, the basic paint and the granulation solution with a specific raw material ratio are adopted, so that the crack resistance of the colorful decorative paint to relatively large and non-uniform deformation or impact is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building decoration materials, in particular to a crack-resistant colorful decorative paint. Background Art

[0002] Decorative paint (also known as water-in-water or water-in-sand paint) is a single- or multi-component coating made by stably dispersing a base paint of varying colors within a continuous phase. After application, the colored particles blend and overlap, creating a rich, realistic decorative effect resembling natural stone, granite, or marble. Due to its rich color palette, strong decorative properties, low cost relative to stone, convenient application, and high safety, it has gained widespread application in building exterior wall decoration.

[0003] In the related art, a rigid anti-cracking waterproof coating and a preparation method thereof are disclosed. The waterproof coating is mixed with a powder and a liquid, and the mixing ratio of the powder to the liquid is: 1:0.36-1:0.4; the powder includes, by mass percentage: 45-50% white cement, 7-15% large-particle quartz sand with a particle size of 30-80 mesh, 25-35% small-particle quartz sand with a particle size of 80-120 mesh, 10-20% heavy calcium powder, 0.25-0.35% cellulose ether, 0.25-0.25% blue powder, 0.1-0.2% silicone hydrophobic agent, 0.15-0.25% powder defoaming agent and 0.25-0.35% powder water reducer; the liquid includes, by mass percentage: 30-40% styrene-butadiene emulsion, 0.3-0.5% defoaming agent, 0.15-0.25% preservative and 59.5-69.5% water.

[0004] However, the crack resistance of these rigid crack-resistant waterproof coatings relies primarily on high strength and low shrinkage, rather than flexibility. High strength and low shrinkage may be effective in resisting small, uniform deformations of the substrate, but may be insufficient for large, non-uniform deformations or impacts. Summary of the Invention

[0005] In order to improve the crack resistance of the multi-colored decorative coating against large, non-uniform deformation or impact, the present application provides a crack-resistant multi-colored decorative coating.

[0006] In a first aspect, the present application provides a crack-resistant multi-colored decorative coating, which adopts the following technical solution:

[0007] A crack-resistant colorful decorative paint comprises the following raw materials in percentage by weight: 60-70% continuous phase, 25-35% base paint and 5-10% granulation solution; based on the total weight of the crack-resistant colorful decorative paint, the continuous phase comprises the following raw materials in parts by weight: 45-55 parts of deionized water, 30-38 parts of polyurethane-acrylic hybrid emulsion, 0.4-0.8 parts of thickener, 0.1-0.2 parts of pH regulator, 0.3-0.6 parts of wetting dispersant, 0.4-0.6 parts of defoaming agent, 2-3 parts of film-forming aid. The base paint comprises the following raw materials in parts by weight: 15-20 parts of deionized water, 45-55 parts of silicone acrylic emulsion, 10-18 parts of color pigment, 10-15 parts of sericite powder, 5-8 parts of calcined kaolin, 0.3-0.6 parts of toughening fiber, 3-6 parts of rubber powder, 0.6-1.0 parts of wetting and dispersing agent, 0.3-0.5 parts of defoaming agent, 0.3-0.8 parts of thickener, and 1.5-2.5 parts of film-forming aid; the granulating solution is an aqueous solution of lithium magnesium silicate with a viscosity of 2680-3550 mPa·s.

[0008] In a specific embodiment, the polyurethane-acrylic hybrid emulsion includes a polyurethane emulsion and an acrylic emulsion in a weight ratio of (1-1.2):1.

[0009] In a specific embodiment, the toughening fibers include PP fibers and PAN fibers in a weight ratio of 1:(1.8-2).

[0010] In a specific embodiment, the length of the PP fiber is 2-3 mm, and the length of the PAN fiber is 5-7 mm.

[0011] In a specific embodiment, the particle size of the sericite powder is 760-820 mesh.

[0012] In a specific embodiment, the particle size of the rubber powder is 80-100 mesh.

[0013] In a specific embodiment, the continuous phase and the base paint further include a silane coupling agent.

[0014] In a specific embodiment, the granulation solution includes the following raw materials in parts by weight:

[0015] 4-6 parts of lithium magnesium silicate powder, 94-96 parts of deionized water.

[0016] In a second aspect, the present application provides a method for preparing a crack-resistant multi-colored decorative coating, which adopts the following technical solution:

[0017] A method for preparing a crack-resistant colorful decorative coating comprises the following steps:

[0018] According to the ratio of the continuous phase, the thickener is added to the deionized water under stirring, and the mixture is stirred evenly. The pH regulator, wetting and dispersing agent, polyurethane-acrylic hybrid emulsion, film-forming aid, and defoaming agent are added in sequence, and the mixture is stirred evenly. The mixture is sieved, sealed, and allowed to stand at room temperature to obtain a continuous phase.

[0019] According to the ratio of the base paint, deionized water and wetting dispersant are mixed evenly, color pigment, sericite powder and calcined kaolin are added in sequence and dispersed evenly, silicone acrylic emulsion, film-forming agent, pretreated fiber, rubber powder and defoaming agent are added, stirred evenly and allowed to stand at room temperature to obtain the base paint;

[0020] The continuous phase, base paint and granulation solution are weighed according to the mass ratio of (60-70):(25-35):(5-10), and the base paint is added to the granulation solution under stirring at 300-400 rpm. After the addition is completed, the mixture is allowed to stand for more than 30 minutes, and the continuous phase is added. The mixture is mixed evenly, sieved, and sealed to obtain a crack-resistant colorful decorative coating.

[0021] In summary, this application has the following beneficial effects:

[0022] 1. This application uses a continuous phase, a base paint and a granulation solution with a specific raw material ratio to improve the crack resistance of the colorful decorative coating to large, uneven deformation or impact.

[0023] 2. In this application, a hybrid solution of polyurethane emulsion and acrylic emulsion with a weight ratio of (1-1.2):1, as well as PP fibers and PAN fibers with specific lengths and weight ratios are preferably used, which helps to simultaneously improve the crack resistance of the colorful decorative coating to large, uneven deformation or impact.

[0024] 3. This application uses sericite powder with a particle size of 760-820 mesh, rubber powder with a particle size of 80-100 mesh and adds a silane coupling agent, which helps to further improve the crack resistance of the colorful decorative coating to large, uneven deformation or impact. DETAILED DESCRIPTION

[0025] Unless otherwise specified, the raw materials used in this application are commercially available. UH650. BASF ACRONAL MB EDGE 4247 acrylic emulsion. Walter Hectgel-RD high-transparency water-based coating thickener. Dow ANGUS AMP-95 pH adjuster. BYK DISPERBYK-103 solvent-based wetting and dispersing agent. Shin-Etsu KMZ-7752 defoamer. Holland Schup PC680 coalescing agent. Zhongen Chemical SA-110 silicone acrylic emulsion. Iron oxide brown 686 pigment purchased from Shanghai Shenhong Pigment Co., Ltd. Sericite powder purchased from Chuzhou Wanqiao Sericite Co., Ltd. Calcined kaolin purchased from Lingshou Shengyun Mineral Products Processing Plant, particle size 800 mesh. PP fiber and PAN fiber purchased from Fuzhou Sifang Chemical Co., Ltd. Rubber powder purchased from Linyi Shouxin Rubber & Plastic Technology Co., Ltd. Lithium magnesium silicate powder was purchased from Wuhan Jiyesheng Chemical Co., Ltd.

[0026] The present application is further described in detail below with reference to the following examples and comparative examples.

[0027] Example

[0028] Example 1

[0029] This embodiment provides a crack-resistant colorful decorative paint, which includes the following raw materials in the following mass percentages: 62.5% continuous phase, 30% base paint, and 7.5% granulation solution.

[0030] The continuous phase contains the following raw materials: 50 kg of deionized water, 34 kg of a polyurethane-acrylic hybrid emulsion, 0.6 kg of a thickener, 0.15 kg of a pH adjuster, 0.45 kg of a wetting and dispersing agent, 0.5 kg of a defoamer, and 2.5 kg of a film-forming aid. The polyurethane-acrylic hybrid emulsion consists of a polyurethane emulsion and an acrylic emulsion in a weight ratio of 1.1:1. The polyurethane emulsion is added to the acrylic emulsion while stirring until uniformly mixed, yielding the polyurethane-acrylic hybrid emulsion.

[0031] The base paint includes the following raw materials: 17.5 kg of deionized water, 50 kg of silicone acrylic emulsion, 14 kg of color pigment, 12.5 kg of sericite powder with a particle size of 760-820 mesh, 6.5 kg of calcined kaolin, 0.45 kg of PP fiber with a length of 2-3 mm, 4.5 kg of rubber powder with a particle size of 80-100 mesh, 0.8 kg of wetting and dispersing agent, 0.4 kg of defoaming agent, 0.55 kg of thickener, and 2 kg of film-forming agent.

[0032] The granulation solution includes the following raw materials: 5 kg of lithium magnesium silicate powder and 95 kg of deionized water. The lithium magnesium silicate powder is added to the deionized water under stirring and stirred evenly to obtain a lithium magnesium silicate aqueous solution with a viscosity of 3045 mPa·s, which is the granulation solution.

[0033] A preparation method of anti-cracking multi-color decorative paint, comprising the following steps:

[0034] According to the proportion of the continuous phase, the thickening agent is added into the deionized water under stirring, and stirred uniformly, and then the pH regulator, the wet dispersing agent, the polyurethane-acrylic hybrid emulsion, the film forming aid and the defoaming agent are sequentially added and stirred uniformly, and then sieved through a 100-mesh screen, sealed and left to stand at room temperature to obtain the continuous phase;

[0035] According to the proportion of the base paint, the deionized water and the wet dispersing agent are mixed uniformly, and then the color pigments, the silk mica powder and the calcined kaolin are sequentially added and dispersed uniformly, and then the silicone-acrylate emulsion, the film forming aid, the pretreated fiber and the rubber powder are added and stirred uniformly, and then left to stand at room temperature to obtain the base paint;

[0036] The continuous phase, the base paint and the granulation solution are weighed according to the mass ratio of 62.5:30:7.5, and then the base paint is added into the granulation solution under stirring at 300-400 rpm, and then the continuous phase is added after standing for more than 30 min, and then mixed uniformly and sieved through a 40-mesh screen to obtain the anti-cracking multi-color decorative paint.

[0037] Example 2

[0038] The difference between this example and example 1 is that the anti-cracking multi-color decorative paint comprises raw materials in the following mass percentages: 60% of the continuous phase, 35% of the base paint and 5% of the granulation solution, and in the preparation method of the anti-cracking multi-color decorative paint, the continuous phase, the base paint and the granulation solution are weighed according to the mass ratio of 60:35:5.

[0039] Example 3

[0040] The difference between this example and example 1 is that the anti-cracking multi-color decorative paint comprises raw materials in the following mass percentages: 65% of the continuous phase, 25% of the base paint and 10% of the granulation solution, and in the preparation method of the anti-cracking multi-color decorative paint, the continuous phase, the base paint and the granulation solution are weighed according to the mass ratio of 60:35:5.

[0041] Example 4

[0042] The difference between this example and example 1 is that the anti-cracking multi-color decorative paint comprises raw materials in the following mass percentages: 70% of the continuous phase, 25% of the base paint and 5% of the granulation solution, and in the preparation method of the anti-cracking multi-color decorative paint, the continuous phase, the base paint and the granulation solution are weighed according to the mass ratio of 70:25:5.

[0043] Example 5

[0044] The difference between this embodiment and embodiment 1 is only that the continuous phase comprises the following raw materials: 45 kg of deionized water, 38 kg of polyurethane-acrylic hybrid emulsion, 0.8 kg of thickening agent, 0.2 kg of pH regulator, 0.6 kg of wetting dispersant, 0.6 kg of defoaming agent, and 3 kg of film-forming aid. The base paint comprises the following raw materials: 15 kg of deionized water, 55 kg of silicone-acrylate emulsion, 18 kg of color pigment, 15 kg of sericite powder with a particle size of 760-820 mesh, 8 kg of calcined kaolin, 0.6 kg of PP fiber, 6 kg of rubber powder with a particle size of 80-100 mesh, 1.0 kg of wetting dispersant, 0.5 kg of defoaming agent, 0.8 kg of thickening agent, and 2.5 kg of film-forming aid.

[0045] Embodiment 6

[0046] The difference between this embodiment and embodiment 1 is only that the continuous phase comprises the following raw materials: 55 kg of deionized water, 30 kg of polyurethane-acrylic hybrid emulsion, 0.4 kg of thickening agent, 0.1 kg of pH regulator, 0.3 kg of wetting dispersant, 0.4 kg of defoaming agent, and 2 kg of film-forming aid. The base paint comprises the following raw materials: 20 kg of deionized water, 45 kg of silicone-acrylate emulsion, 10 kg of color pigment, 10 kg of sericite powder with a particle size of 760-820 mesh, 5 kg of calcined kaolin, 0.3 kg of PP fiber, 3 kg of rubber powder with a particle size of 80-100 mesh, 0.6 kg of wetting dispersant, 0.3 kg of defoaming agent, 0.3 kg of thickening agent, and 1.5 kg of film-forming aid.

[0047] Embodiment 7

[0048] The difference between this embodiment and embodiment 1 is only that the granulation solution comprises the following raw materials: 4 kg of lithium magnesium silicate powder and 96 kg of deionized water. The lithium magnesium silicate powder is added to the deionized water under stirring, and stirred uniformly to obtain a lithium magnesium silicate aqueous solution with a viscosity of 2680 mPa·s, which is the granulation solution.

[0049] Embodiment 8

[0050] The difference between this embodiment and embodiment 1 is only that the granulation solution comprises the following raw materials: 6 kg of lithium magnesium silicate powder and 94 kg of deionized water. The lithium magnesium silicate powder is added to the deionized water under stirring, and stirred uniformly to obtain a lithium magnesium silicate aqueous solution with a viscosity of 3550 mPa·s, which is the granulation solution.

[0051] Embodiment 9

[0052] The difference between this embodiment and embodiment 1 is only that the polyurethane-acrylic hybrid emulsion comprises polyurethane emulsion and acrylic emulsion in a weight ratio of 0.9:1.

[0053] Embodiment 10

[0054] The only difference between this embodiment and embodiment 1 is that the polyurethane-acrylic hybrid emulsion includes a polyurethane emulsion and an acrylic emulsion in a weight ratio of 1:1.

[0055] Example 11

[0056] The only difference between this embodiment and embodiment 1 is that the polyurethane-acrylic hybrid emulsion includes a polyurethane emulsion and an acrylic emulsion in a weight ratio of 1.2:1.

[0057] Example 12

[0058] The only difference between this embodiment and embodiment 1 is that the polyurethane-acrylic hybrid emulsion includes a polyurethane emulsion and an acrylic emulsion in a weight ratio of 1.3:1.

[0059] Example 13

[0060] This embodiment differs from Example 1 only in that, in the raw materials and preparation method of the crack-resistant multi-colored decorative coating, the 2-3 mm long PP fibers are replaced with an equal amount of toughening fibers. The toughening fibers comprise 2-3 mm long PP fibers and 5-7 mm long PAN fibers at a weight ratio of 1:1.6.

[0061] Example 14

[0062] This embodiment differs from Example 1 only in that, in the raw materials and preparation method of the crack-resistant multi-colored decorative coating, the 2-3 mm long PP fibers are replaced with an equal amount of toughening fibers. The toughening fibers comprise 2-3 mm long PP fibers and 5-7 mm long PAN fibers at a weight ratio of 1:1.8.

[0063] Example 15

[0064] This embodiment differs from Example 1 only in that, in the raw materials and preparation method of the crack-resistant multi-color decorative coating, the 2-3 mm long PP fibers are replaced with an equal amount of toughening fibers. The toughening fibers comprise 2-3 mm long PP fibers and 5-7 mm long PAN fibers at a weight ratio of 1:2.0.

[0065] Example 16

[0066] This embodiment differs from Example 1 only in that, in the raw materials and preparation method for the crack-resistant multi-colored decorative coating, the 2-3 mm long PP fibers are replaced with an equal amount of toughening fibers. The toughening fibers comprise 2-3 mm long PP fibers and 5-7 mm long PAN fibers at a weight ratio of 1:2.2.

[0067] Example 17

[0068] The difference between this embodiment and embodiment 1 is only that in the raw materials and preparation method of the anti-cracking multi-color decorative coating, the PP fiber with a length of 2-3 mm is replaced by an equal amount of toughening fiber. The toughening fiber includes PP fiber with a length of 5-7 mm and PAN fiber with a length of 5-7 mm at a weight ratio of 1:1.8.

[0069] Embodiment 18

[0070] The difference between this embodiment and embodiment 1 is only that in the raw materials and preparation method of the anti-cracking multi-color decorative coating, the PP fiber with a length of 2-3 mm is replaced by an equal amount of toughening fiber. The toughening fiber includes PP fiber with a length of 2-3 mm and PAN fiber with a length of 2-3 mm at a weight ratio of 1:1.8.

[0071] Embodiment 19

[0072] The difference between this embodiment and embodiment 1 is only that in the raw materials and preparation method of the anti-cracking multi-color decorative coating, the particle size of the sericite powder is 700-750 mesh.

[0073] Embodiment 20

[0074] The difference between this embodiment and embodiment 1 is only that in the raw materials and preparation method of the anti-cracking multi-color decorative coating, the particle size of the sericite powder is 850-900 mesh.

[0075] Embodiment 21

[0076] The difference between this embodiment and embodiment 1 is only that in the raw materials and preparation method of the anti-cracking multi-color decorative coating, the particle size of the rubber powder is 60-70 mesh.

[0077] Embodiment 22

[0078] The difference between this embodiment and embodiment 1 is only that in the raw materials and preparation method of the anti-cracking multi-color decorative coating, the particle size of the rubber powder is 110-130 mesh.

[0079] Embodiment 23

[0080] This embodiment provides an anti-cracking multi-color decorative coating, which includes the following raw materials in mass percentage: continuous phase 62.5%, base paint 30%, and granulation solution 7.5%.

[0081] The continuous phase includes the following raw materials: 50 kg of deionized water, 34 kg of a polyurethane-acrylic hybrid emulsion, 0.6 kg of a thickener, 0.15 kg of a pH adjuster, 0.45 kg of a wetting and dispersing agent, 0.5 kg of a defoamer, 2.5 kg of a film-forming aid, and 0.2 kg of a silane coupling agent (KH-550). The polyurethane-acrylic hybrid emulsion comprises a polyurethane emulsion and an acrylic emulsion in a weight ratio of 1.1:1. The polyurethane emulsion is added to the acrylic emulsion while stirring until uniformly mixed, yielding the polyurethane-acrylic hybrid emulsion.

[0082] The base paint includes the following raw materials: 17.5 kg of deionized water, 50 kg of silicone acrylic emulsion, 14 kg of color pigment, 12.5 kg of sericite powder with a particle size of 760-820 mesh, 6.5 kg of calcined kaolin, 0.45 kg of PP fiber with a length of 2-3 mm, 4.5 kg of rubber powder with a particle size of 80-100 mesh, 0.8 kg of wetting and dispersing agent, 0.4 kg of defoaming agent, 0.55 kg of thickener, 2 kg of film-forming aid, and 0.2 kg of silane coupling agent (KH-550).

[0083] The granulation solution includes the following raw materials: 5 kg of lithium magnesium silicate powder and 95 kg of deionized water. The lithium magnesium silicate powder is added to the deionized water under stirring and stirred evenly to obtain a lithium magnesium silicate aqueous solution with a viscosity of 3045 mPa·s, which is the granulation solution.

[0084] A method for preparing a crack-resistant colorful decorative coating comprises the following steps:

[0085] According to the ratio of the continuous phase, the thickener was added to the deionized water under stirring, and the mixture was stirred evenly. The pH regulator, wetting and dispersing agent, polyurethane-acrylic hybrid emulsion, film-forming aid, defoaming agent, and silane coupling agent were added in sequence, and the mixture was stirred evenly. The mixture was passed through a 100-mesh sieve, sealed, and allowed to stand at room temperature to obtain a continuous phase.

[0086] According to the ratio of the base paint, deionized water and wetting dispersant are mixed evenly, color pigment, sericite powder and calcined kaolin are added in sequence and dispersed evenly, silicone acrylic emulsion, film-forming agent, pretreated fiber, rubber powder, defoamer and silane coupling agent are added, stirred evenly, and allowed to stand at room temperature to obtain the base paint;

[0087] Weigh the continuous phase, base paint, and granulation solution in a mass ratio of 62.5:30:7.5. Add the base paint to the granulation solution while stirring at 300-400 rpm. After addition, let it stand for at least 30 minutes. Then add the continuous phase, mix thoroughly, sieve through a 40-mesh screen, and seal to obtain a crack-resistant, multicolored decorative coating.

[0088] Comparative Example

[0089] Comparative Example 1

[0090] The only difference between this comparative example and Example 1 is that in the raw materials and preparation method of the crack-resistant colorful decorative coating, an equal amount of polyurethane emulsion is used to replace the polyurethane-acrylic hybrid emulsion.

[0091] Comparative Example 2

[0092] The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the crack-resistant colorful decorative coating, an equal amount of acrylic emulsion is used to replace the polyurethane-acrylic hybrid emulsion.

[0093] Comparative Example 3

[0094] The only difference between this comparative example and Example 1 is that in the raw materials and preparation method of the crack-resistant colorful decorative coating, an equal amount of silicone acrylic emulsion is used to replace the polyurethane-acrylic hybrid emulsion.

[0095] Comparative Example 4

[0096] The only difference between this comparative example and Example 1 is that in the raw materials and preparation method of the crack-resistant colorful decorative paint, an equal amount of polyurethane emulsion is used to replace the silicone acrylic emulsion.

[0097] Comparative Example 5

[0098] The only difference between this comparative example and Example 1 is that in the raw materials and preparation method of the crack-resistant colorful decorative paint, an equal amount of calcined kaolin is used to replace the sericite powder with a particle size of 760-820 mesh.

[0099] Comparative Example 6

[0100] The only difference between this comparative example and Example 1 is that in the raw materials and preparation method of the crack-resistant colorful decorative coating, the rubber powder with a particle size of 80-100 mesh is replaced by an equal amount of calcined kaolin.

[0101] Comparative Example 7

[0102] The only difference between this comparative example and Example 1 is that in the raw materials and preparation method of the crack-resistant colorful decorative coating, an equal amount of calcined kaolin is used to replace the PP fibers with a length of 2-3 mm.

[0103] Performance testing

[0104] For Examples 1-23 and Comparative Examples 1-7, the following performance tests were performed:

[0105] To test the crack resistance of large, uneven deformations, a cement fiberboard (200 × 150 × 6 mm) with pre-cut cracks of 1.0 mm width was used. The substrate was cleaned and coated with a matching anti-crack primer. The prepared crack-resistant multi-color decorative coating was then scraped over the cracked area with a wet film thickness of 1.5 mm. The coating was cured for 28 days at 23 ± 2°C and 50 ± 5% relative humidity. Using a servo-controlled tensile testing machine, the substrate was stretched at a rate of 0.5 mm / min until the coating broke. The maximum width of the crack, at which a through-crack appeared in the coating, was recorded (accurate to 0.01 mm).

[0106] To test crack resistance against large, uneven impacts, the prepared crack-resistant multi-colored decorative coating was scraped onto steel panels (200 × 200 × 1 mm, with primer) to a dry film thickness of 1.0 ± 0.1 mm and cured for 7 days. Using a falling ball impact tester, a 1 kg steel ball was dropped from a height of 10 cm onto the center of the test panel. The impact was repeated in increments of 10 cm until radial cracks or flaking appeared on the coating. The impact heights of three test panels were averaged and tested to the nearest 1 cm.

[0107] The test results are shown in Table 1.

[0108] Table 1

[0109]

[0110] Combining Example 1 with Comparative Examples 1-7 and Table 1, it can be seen that compared to Example 1, the crack widths of Comparative Examples 1-7, when the cracks extend to the point where a through-crack appears in the coating, are all less than 0.8 mm, and the average impact heights are all less than 70 cm. This demonstrates that the raw material ratio and preparation method of Example 1 help improve the crack resistance of the multi-colored decorative coating to large, uneven deformation or impact, thereby enhancing the coating's crack resistance.

[0111] Combining Examples 1-23 with Table 1, it can be seen that the maximum width of cracks in Examples 1-23, when they extend to the point where through-cracks appear in the coating, is greater than 0.8 mm, and the average impact height is ≥ 80 cm. This demonstrates that using the raw material ratios and preparation methods within the ranges of Examples 1-23, it is possible to produce multi-colored decorative coatings with excellent crack resistance, helping to improve the crack resistance of multi-colored decorative coatings to large, uneven deformations or impacts.

[0112] This may be because, polyurethane has high elongation at break, can absorb deformation energy, the tensile strength of acrylic is larger, can give the coating rigid support. Therefore, the polyurethane-acrylic hybrid emulsion can form a "flexible and rigid" network in the coating. Again, because the toughening fiber toughens the coating by energy consumption through plastic deformation, bridging macroscopic cracks and other forms, the elastic rubber powder fills the gap between the coating particles, locally absorbs impact stress, and the sheet structure of sericite powder slips and prevents cracking, which improves the compactness of the coating, and the three synergistically form a toughening composite structure. The aqueous solution of magnesium lithium silicate forms a three-dimensional gel network to wrap the colored particles, preventing particle fusion before construction. During construction, the silane hydrolysis is activated to promote the coupling reaction. Therefore, the anti-cracking performance of the multi-color decorative coating to larger and uneven deformation or impact is improved.

[0113] As can be seen from Examples 1, 9-12 and Table 1, as the proportion of polyurethane emulsion in the polyurethane-acrylic hybrid emulsion gradually increases, the maximum width of the crack width expansion to the appearance of a through crack in the coating and the average impact height also gradually increase. However, when the weight ratio of polyurethane emulsion to acrylic emulsion in the polyurethane-acrylic hybrid emulsion is greater than 1.2:1, the maximum width of the crack width expansion to the appearance of a through crack in the coating and the average impact height become smaller. Therefore, when the weight ratio of polyurethane emulsion to acrylic emulsion in the polyurethane-acrylic hybrid emulsion is within the range of (1-1.2):1, it helps to further improve the anti-cracking performance of the multi-color decorative coating to larger and uneven deformation or impact.

[0114] As can be seen from Examples 1, 13-18 and Table 1, the maximum width of the crack width expansion to the appearance of a through crack in the coating of Examples 14-15 is not only greater than 1mm, but also ≥90cm. This shows that using PP fibers with a length of 2-3mm and PAN fibers with a length of 5-7mm at a weight ratio of 1:(1.8-2) helps to simultaneously improve the anti-cracking performance of the multi-color decorative coating to larger and uneven deformation or impact.

[0115] As can be seen from Examples 1, 19-23 and Table 1, using sericite powder with a particle size of 760-820 mesh and rubber powder with a particle size of 80-100 mesh and adding a silane coupling agent helps to further improve the anti-cracking performance of the multi-color decorative coating to larger and uneven deformation or impact.

[0116] This specific embodiment is only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the present embodiment without creative contribution after reading the present specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A crack-resistant colorful decorative paint, characterized in that: The invention comprises the following raw materials in percentage by weight: 60-70% of a continuous phase, 25-35% of a base paint, and 5-10% of a granulation solution; based on the total weight of the crack-resistant colorful decorative coating, the continuous phase comprises the following raw materials in parts by weight: 45-55 parts of deionized water, 30-38 parts of a polyurethane-acrylic hybrid emulsion, 0.4-0.8 parts of a thickener, 0.1-0.2 parts of a pH regulator, 0.3-0.6 parts of a wetting and dispersing agent, and 0.4-0.6 parts of a defoaming agent. .6 parts, film-forming aid 2-3 parts; the base paint includes the following raw materials in parts by weight: deionized water 15-20 parts, silicone acrylic emulsion 45-55 parts, color pigment 10-18 parts, sericite powder 10-15 parts, calcined kaolin 5-8 parts, toughening fiber 0.3-0.6 parts, rubber powder 3-6 parts, wetting dispersant 0.6-1.0 parts, defoaming agent 0.3-0.5 parts, thickener 0.3-0.8 parts, film-forming aid 1.5-2.5 parts; The granulation solution is an aqueous solution of lithium magnesium silicate with a viscosity of 2680-3550 mPa·s.

2. The crack-resistant colorful decorative paint according to claim 1, characterized in that: The polyurethane-acrylic acid hybrid emulsion comprises a polyurethane emulsion and an acrylic acid emulsion in a weight ratio of (1-1.2):

1.

3. The crack-resistant colorful decorative paint according to claim 1, characterized in that: The toughening fibers include PP fibers and PAN fibers in a weight ratio of 1:(1.8-2).

4. The crack-resistant colorful decorative paint according to claim 3, characterized in that: The length of the PP fiber is 2-3 mm, and the length of the PAN fiber is 5-7 mm.

5. The crack-resistant colorful decorative paint according to claim 1, characterized in that: The particle size of the sericite powder is 760-820 meshes.

6. The crack-resistant multi-colored decorative paint according to claim 5, characterized in that: The particle size of the rubber powder is 80-100 meshes.

7. The crack-resistant colorful decorative paint according to claim 1, characterized in that: The continuous phase and the base paint each further include a silane coupling agent.

8. The crack-resistant multi-colored decorative paint according to claim 1, characterized in that: The granulation solution comprises the following raw materials in parts by weight: 4-6 parts of lithium magnesium silicate powder and 94-96 parts of deionized water.

9. A method for preparing a multi-colored decorative coating according to any one of claims 1 to 8, characterized in that: The steps include: According to the ratio of the continuous phase, the thickener is added to the deionized water under stirring, and the mixture is stirred evenly. The pH regulator, wetting and dispersing agent, polyurethane-acrylic hybrid emulsion, film-forming aid, and defoaming agent are added in sequence, and the mixture is stirred evenly. The mixture is sieved, sealed, and allowed to stand at room temperature to obtain a continuous phase. According to the ratio of the base paint, deionized water and wetting dispersant are mixed evenly, color pigment, sericite powder and calcined kaolin are added in sequence and dispersed evenly, silicone acrylic emulsion, film-forming agent, pretreated fiber, rubber powder and defoaming agent are added, stirred evenly and allowed to stand at room temperature to obtain the base paint; The continuous phase, base paint and granulation solution are weighed according to the mass ratio of (60-70):(25-35):(5-10), and the base paint is added to the granulation solution under stirring at 300-400 rpm. After the addition is completed, the mixture is allowed to stand for more than 30 minutes, and the continuous phase is added. The mixture is mixed evenly, sieved, and sealed to obtain a crack-resistant colorful decorative coating.

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