Architectural colored drawing color paste based on silicone rubber waterproof paint and preparation method thereof

Abstract

The invention discloses building colored drawing color paste based on silicone rubber waterproof paint and a preparation method of the building colored drawing color paste. The building colored drawing color paste comprises the following components in parts by weight: 80-95 parts of silicone rubber waterproof and decorative integrated paint for an outer wall; 3 to 15 parts of a thickening agent; 2-8 parts of a pigment; and 0.5-2 parts of a light stabilizer. The preparation method is simple, reasonable and easy to operate, the prepared building colored drawing paste can be used for smoothly writing and drawing on various base materials, the color is bright, the covering power is good, color overlapping is easy, and after a coating is dried, the coating has waterproof and self-cleaning performance, is water-based, environmentally friendly and free of pollution and has no toxic effect on the body. The weather resistance is good, the artificial weathering aging time exceeds 3000h, and the normal external exposure use time can reach 20 years.

Description

Technical Field

[0001] The present invention relates to the technical field of building decoration materials, and particularly relates to a building painting color paste based on silicone rubber waterproof coating and a preparation method thereof. Background Art

[0002] Building painting is an art form with a long history and rich cultural connotations, widely used in buildings such as palaces, temples, and folk houses, with both decorative and protective functions.

[0003] The pigments commonly used in traditional building painting usually include natural mineral pigments, plant pigments, etc. Mineral pigments are bright in color, high in stability, and good in light resistance, but their cost is very high, and some materials contain toxic elements such as mercury and arsenic, which have great toxic side effects on the human body. Plant pigments are mainly extracted from plants, natural and environmentally friendly, with soft colors, but their light resistance and stability are relatively poor.

[0004] To overcome the shortcomings of traditional materials, influenced by modern technologies, modern building painting often uses synthetic pigments. There are various types of synthetic pigments, covering organic, inorganic, composite, and functional pigments. They have the advantages of bright colors, high stability, and low cost, and are widely used in various fields. Some synthetic pigments (such as pigments containing chromium and cadmium) still have environmental protection and health problems and need to be used with caution. With the progress of technology, functional and environmentally friendly synthetic pigments have gradually become the development trend.

[0005] Currently, most synthetic pigments use acrylic pigments or oil-based coatings, which have the following defects: 1. Insufficient weather resistance: Currently, compared with plant-extracted pigments, the weather resistance of synthetic pigments has been greatly improved, but they are still prone to problems such as fading and peeling under ultraviolet radiation and rainwashing, far from meeting the requirement of having the same lifespan as the building. 2. Lack of functionality: These pigments themselves have no waterproof and self-cleaning properties, and an additional protective layer needs to be applied, which is time-consuming and laborious. 3. Environmental protection problems: The VOC emissions of solvent-based coatings exceed the standard.

[0006] 4. Although the existing silicone rubber waterproof and decorative integrated coating for exterior walls (T / CWA216 intermediate coating type I) has the advantage of weather resistance, its liquid characteristics cannot meet the requirements of the painting process for the rheological properties of pigments. Summary of the Invention

[0007] The purpose of the present invention is to provide a building painting color paste based on silicone rubber waterproof coating and a preparation method thereof to solve the problems existing in synthetic pigments in the prior art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions: A kind of architectural painting color paste based on silicone rubber waterproof coating provided by the present invention comprises the following components in parts by weight: 80-95 parts of silicone rubber waterproof and decorative integrated coating for exterior walls; 3-15 parts of thickener; 2-8 parts of pigment; 0.5-2 parts of light stabilizer.

[0009] Further, the viscosity of the architectural painting color paste is 10-50 Pa·s.

[0010] Further, the performance indexes of the silicone rubber waterproof and decorative integrated coating for exterior walls meet the requirements of Type I of "Silicone Rubber Waterproof and Decorative Integrated Coating for Exterior Walls" T / CWA 216-2024. Further, the silicone rubber waterproof and decorative integrated coating for exterior walls is prepared by taking silicone rubber emulsion as the main film-forming substance and adding multifunctional auxiliaries and inorganic pigments.

[0011] Furthermore, the silicone rubber waterproof and decorative integrated coating for exterior walls has been introduced in detail in CN118389057A. The silicone rubber waterproof and decorative integrated coating used in the present invention is the coating in Chinese Patent CN118389057A. Specifically, in the silicone rubber waterproof and decorative integrated coating for exterior walls: it comprises the following components in parts by weight: 50-150 parts of silicone rubber emulsion; 10-20 parts of deionized water; 100-150 parts of inorganic pigment filler; 1-5 parts of dispersant; 1-5 parts of wetting agent; 1-5 parts of leveling agent; 0.01-0.1 part of PH regulator; 1-5 parts of defoamer; 0.05-0.5 part of thickener. Silicone rubber emulsion: 90-130 parts of organosilicon rubber polyol; 40-70 parts of reactive crosslinking agent; 3-10 parts of hydrophilic group chain extender; 1-3 parts of trifunctional amino silane coupling agent; 1-3 parts of bifunctional amino silane coupling agent; 1-3 parts of long-chain alkyl alkoxysilane coupling agent; 3-10 parts of neutralization reaction agent; 90-150 parts of deionized water. The dispersant is one or more of polyacrylate, sodium dodecyl sulfate, sodium oleate, carboxylate, sulfate ester salt, sulfonate, adduct of fatty acid and ethylene oxide, polyethylene glycol type polyol and polyethyleneimine derivative, phosphate ester type polymer, adduct of polycaprolactone and triethylenetetramine. The leveling agent is one or more of acrylic leveling agent, organosilicon leveling agent and fluorocarbon compound leveling agent. The wetting agent is one or more of polyether type wetting agent, polyester type wetting agent, alkyl benzene sulfonate type wetting agent, polyether modified silicone type wetting agent, polyester modified silicone type wetting agent. The PH regulator is 2-amino-2-methyl-1-propanol. The thickener is one or more of cellulose thickeners, inorganic thickeners, polyurethane thickeners, acrylic thickeners, and alkali-swellable thickeners; The defoamer is one or more of phosphate ester defoamers, mineral oil defoamers, and silicone defoamers; Inorganic pigments: one or more of heavy calcium carbonate, light calcium carbonate, precipitated barium sulfate, kaolin, silica powder, talc powder, mica powder, titanium dioxide, lithopone, zinc oxide, and antimony white. Further, the thickener is one or more of fumed silica, bentonite, or cellulose ether.

[0012] Further, the thickener is a compound of fumed silica and hydroxyethyl cellulose ether, and the compounding mass ratio of fumed silica to hydroxyethyl cellulose ether is (2~4):1.

[0013] Further, the pigment is a pigment surface-modified by a silane coupling agent.

[0014] Further, the pigment is an inorganic mineral pigment, and the particle size distribution is 1~20μm.

[0015] Further, the light stabilizer is one or more of HALS or nano-titanium dioxide.

[0016] Further, the light stabilizer is a compound of HALS and nano-titanium dioxide, and the compounding mass ratio of HALS to nano-titanium dioxide is 1:(3~6).

[0017] The present invention also provides a preparation method of an architectural painting color paste based on a silicone rubber waterproof coating, comprising the following steps: S1. Add the exterior wall silicone rubber waterproof and decorative integrated coating to a high-speed disperser, and control the temperature at 25~35°C; S2. Add the pigment modified by a silane coupling agent, and disperse at a speed of 800~1200 r / min for 20~40 minutes; S3. Add the thickener in portions, adjust the viscosity to 10~50 Pa·s, then add the light stabilizer for homogenization, and package in a plastic bucket to obtain the finished product.

[0018] Based on the above technical solutions, the embodiments of the present invention can at least produce the following technical effects: (1) The architectural painting color paste based on the silicone rubber waterproof coating provided by the present invention has a simple, reasonable, and easy-to-operate preparation method. The obtained architectural painting color paste can be smoothly written and painted on various substrates, with bright colors, good covering power, easy to superimpose colors, and the coating itself has waterproof and self-cleaning properties after drying, is water-based and environmentally friendly, pollution-free, and has no toxic effect on the body. It has good weather resistance, with more than 3000h of artificial weathering aging and can be used outdoors normally for 20 years, well meeting the market demand.

[0019] (2) The architectural painting color paste based on silicone rubber waterproof coating and its preparation method provided by the present invention. The silicone rubber waterproof and decorative integrated coating for exterior walls used therein can provide excellent weather resistance, water resistance, self-cleaning performance and waterproof function. The thickening system composed of fumed silica and cellulose ether can balance the thixotropy and plasticity of pigments. The surface modification of pigments with silane coupling agent can improve their dispersion stability in the silicone rubber pigment system. The light stabilizer composed of the compound of HALS and nano-titanium dioxide can further increase the weather resistance of pigments and further ensure the dispersion stability of the whole pigment system.

[0020] (3) The architectural painting color paste based on silicone rubber waterproof coating and its preparation method provided by the present invention. The painting made of the prepared architectural painting color paste has a waterproof performance of 0.3 MPa for 120 minutes without water penetration, no cracking after 3000 hours of artificial weathering, a thixotropy index of 3.6 for the pigment, and is suitable for vertical scraping without sagging. It has excellent water repellency and self-cleaning function, with a minimum contact angle ≥ 95°. The limits of harmful substances meet the relevant requirements in GB18582-2020 and the Class A requirements in JC1066-2008. Detailed Description of the Invention

[0021] Various exemplary embodiments of the present invention will be described in detail below. This detailed description should not be construed as a limitation of the present invention, but rather as a more detailed description of certain aspects, characteristics and implementation embodiments of the present invention.

[0022] It should be understood that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the present invention. Additionally, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0023] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Although the present invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0024] Without departing from the scope or spirit of the present invention, various improvements and changes can be made to the specific embodiments of the specification of the present invention, which are obvious to those skilled in the art. Other embodiments obtained from the specification of the present invention are obvious to those skilled in the art. The specification and examples of the present invention are merely exemplary.

[0025] Regarding the terms "comprising", "including", "having", "containing", etc. used herein, they are all open-ended terms, meaning including but not limited to.

[0026] Example 1

[0027] By mass parts: 80 parts of silicone rubber waterproof and decorative integrated coating for exterior walls; 15 parts of a thickener obtained by compounding fumed silica and hydroxyethyl cellulose ether in a ratio of 2:1; 5 parts of a modified iron oxide mineral pigment with a particle size distribution of 15 μm; 1 part of a light stabilizer which is a compound of HALS and nano-titanium dioxide in a ratio of 1:4; the pigment is surface-modified with a silane coupling agent.

[0028] Add the silicone rubber waterproof and decorative integrated coating for exterior walls to a high-speed disperser, and control the temperature at 25 - 35 °C; Add the pigment modified with a silane coupling agent, and disperse at a speed of 800 - 1200 r / min for 20 - 40 minutes; Add the thickener in portions, with the viscosity test value being 32 Pa·s, add the light stabilizer and homogenize, and the finished product is obtained after packaging in plastic drums.

[0029] The weather resistance, waterproof performance, self-cleaning performance, coating temperature resistance variation, etc. of the architectural painting color paste based on the silicone rubber waterproof coating prepared above are tested according to the requirements of Type I Middle Coat in "Silicone Rubber Waterproof and Decorative Integrated Coating for Exterior Walls" T / CWA 216 - 2024. The thixotropy index of the pigment is determined according to GB / T 9269, and the combustion performance is determined according to GB / T 8626. The results are shown in Table 1: Table 1 Test Results Serial Number Test Item Index Requirement Test Result 1 Artificial Weathering Resistance (3000h) No blistering, cracking or peeling Qualified 2 Water Impermeability No water penetration under 0.3MPa for 120min Qualified 3 Hydrophobicity Minimum contact angle ≥ 95° Qualified 4 Coating Temperature Resistance Variation (20 cycles) No abnormality Qualified 5 Thixotropy Index 4.0≥X≥3.0 3.6 6 Combustion Performance B2 Qualified Example 2 By mass parts: 95 parts of silicone rubber waterproof and decorative integrated coating for exterior walls; 10 parts of a thickener obtained by compounding fumed silica and hydroxyethyl cellulose ether in a ratio of 2:1; 8 parts of a modified iron oxide mineral pigment with a particle size distribution of 15 μm; 2 parts of a light stabilizer which is a compound of HALS and nano-titanium dioxide in a ratio of 1:4; the pigment is surface-modified with a silane coupling agent.

[0030] Add the silicone rubber waterproof and decorative integrated coating for exterior walls to a high-speed disperser, and control the temperature at 25 - 35 °C; Add the pigment modified with silane coupling agent and disperse it at a speed of 800 - 1200 r / min for 20 - 40 minutes; Add the thickener in portions. The viscosity test value is 50 Pa·s. Add the light stabilizer and homogenize it. The finished product is obtained after packaging in a plastic bucket.

[0031] The weather resistance, water resistance, self - cleaning performance, temperature resistance of the coating, etc. of the architectural painting color paste based on silicone rubber waterproof coating are tested according to the requirements of Type I Middle Coat in "Silicone Rubber Waterproof and Decorative Integrated Coating for Exterior Wall" T / CWA 216 - 2024. The thixotropy index of the pigment is determined according to GB / T 9269, and the combustion performance is determined according to GB / T 8626. The results are shown in Table 2: Table 2 Test Results Serial Number Test Item Index Requirement Test Result 1 Artificial Weathering Resistance (3000h) No blistering, cracking or peeling Qualified 2 Water Impermeability No water penetration under 0.3MPa for 120min Qualified 3 Hydrophobicity Minimum contact angle ≥ 95° Qualified 4 Coating Temperature Resistance Variation (20 cycles) No abnormality Qualified 5 Thixotropy Index 4.0≥X≥3.0 3.5 6 Combustion Performance B2 Qualified Example 3 By mass fraction: 90 parts of silicone rubber waterproof and decorative integrated coating for exterior wall; 8 parts of thickener with a compounding ratio of 2:1 of fumed silica and hydroxyethyl cellulose ether; 6 parts of modified iron oxide mineral pigment with a particle size distribution of 15 μm; 0.5 part of light stabilizer with a compounding ratio of 1:4 of HALS and nano - titanium dioxide; the pigment is surface - modified with silane coupling agent.

[0032] Add the silicone rubber waterproof and decorative integrated coating for exterior wall into a high - speed disperser and control the temperature at 25 - 35 °C; Add the pigment modified with silane coupling agent and disperse it at a speed of 800 - 1200 r / min for 20 - 40 minutes; Add the thickener in portions. The viscosity test value is 10 Pa·s. Add the light stabilizer and homogenize it. The finished product is obtained after packaging in a plastic bucket.

[0033] The weather resistance, water resistance, self - cleaning performance, temperature resistance of the coating, etc. of the architectural painting color paste based on silicone rubber waterproof coating are tested according to the requirements of Type I Middle Coat in "Silicone Rubber Waterproof and Decorative Integrated Coating for Exterior Wall" T / CWA 216 - 2024. The thixotropy index of the pigment is determined according to GB / T 9269, and the combustion performance is determined according to GB / T 8626. The results are shown in Table 3: Table 3 Test Results Serial Number Test Item Index Requirement Test Result 1 Artificial Weathering Resistance (3000h) No blistering, cracking or peeling Qualified 2 Water Impermeability No water penetration under 0.3MPa for 120min Qualified 3 Hydrophobicity Minimum contact angle ≥ 95° Qualified 4 Coating Temperature Resistance Variation (20 cycles) No abnormality Qualified 5 Thixotropy Index 4.0≥X≥3.0 3.7 6 Combustion Performance B2 Qualified Except for the items listed in the table, the tensile properties, alkali resistance, acid resistance, water resistance, adhesion strength, low - temperature bending property, washability, and harmful substance content, etc. of the architectural painting color paste based on silicone rubber waterproof coating all meet the requirements of Type I Middle Coat in T / CWA 216 - 2024.

[0034] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A building painting color paste based on silicone rubber waterproof coating, characterized in that, It includes the following components in parts by weight: 80 - 95 parts of silicone rubber waterproof and decorative integrated coating for exterior walls; 3 - 15 parts of thickener; 2 - 8 parts of pigment; 0.5 - 2 parts of light stabilizer.

2. The architectural painting color paste based on silicone rubber waterproof coating according to claim 1, characterized in that The viscosity of the architectural painting paste is 10 - 50 Pa·s.

3. The architectural painting color paste based on silicone rubber waterproof coating according to claim 1, characterized in that The silicone rubber waterproof and decorative integrated coating for exterior walls is prepared by using silicone rubber emulsion as the main film - forming substance and adding multifunctional additives and inorganic pigments.

4. The architectural painting color paste based on silicone rubber waterproof coating according to claim 1, characterized in that The thickener is one or more of fumed silica, bentonite or cellulose ether.

5. The architectural painting color paste based on silicone rubber waterproof coating according to claim 4, characterized in that The thickener is a compound of fumed silica and hydroxyethyl cellulose ether, and the mass ratio of fumed silica to hydroxyethyl cellulose ether in the compound is (2 - 4):

1.

6. The architectural painting color paste based on silicone rubber waterproof coating according to claim 1, wherein The pigment is a pigment surface - modified by a silane coupling agent.

7. The architectural painting color paste based on silicone rubber waterproof coating according to claim 6, characterized in that, The pigment is an inorganic mineral pigment, and its particle size distribution is 1 - 20 μm.

8. The architectural painting color paste based on silicone rubber waterproof coating according to claim 1, wherein The light stabilizer is one or more of HALS or nano - titanium dioxide.

9. The architectural painting color paste based on silicone rubber waterproof coating according to claim 1, characterized in that, The light stabilizer is a compound of HALS and nano - titanium dioxide, and the mass ratio of HALS to nano - titanium dioxide in the compound is 1:(3 - 6).

10. The preparation method of the architectural painting color paste based on silicone rubber waterproof coating according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Add the silicone rubber waterproof and decorative integrated coating for exterior walls into a high - speed disperser, and control the temperature at 25 - 35°C. S2. Add the pigment modified by a silane coupling agent, and disperse it at a speed of 800 - 1200 r / min for 20 - 40 minutes. S3. Add the thickener in portions. After adjusting the viscosity to 10 - 50 Pa·s, add the light stabilizer for homogenization, and then package it in plastic barrels to obtain the finished product.