CN-122011850-A - Water-based paint composition and preparation method and application thereof

Abstract

The invention discloses a water-based paint composition, a preparation method and application thereof, and relates to the technical field of paint. The water-based paint composition comprises emulsion, a thickening agent, a slow-release auxiliary agent, a nano lamellar silicic acid mildew inhibitor, a filler, an auxiliary agent and water, wherein the thickening agent comprises first cellulose and second cellulose, the molecular weight of the first cellulose is different from that of the second cellulose, and the slow-release auxiliary agent comprises at least one of cetyl alcohol, glyceryl stearate, stearic acid, octadecylamine and polyethylene glycol-polylactic acid segmented copolymer. According to the invention, the nanometer layered silicic acid mildew inhibitor is introduced, and a slow-release network is constructed by matching with a specific thickener and a slow-release auxiliary agent, so that a mildew-proof system with a slow-release effect is formed, long-acting mildew prevention is realized, and the problem of environmental protection caused by the traditional chemical mildew inhibitor is solved.

Inventors

• XIN JIAN
• DU YUXIAO
• YU ZHIJIAN

Assignees

• 立邦涂料(湖北)有限公司

Dates

Publication Date

20260512

Application Date

20260323

Claims (10)

1. 1. An aqueous coating composition, which is characterized by comprising emulsion, thickener, slow-release auxiliary agent, nano lamellar silicic acid mildew inhibitor, filler, auxiliary agent and water; The thickener comprises first cellulose and second cellulose, the molecular weight of the first cellulose is different from that of the second cellulose, and the slow release auxiliary agent comprises at least one of cetyl alcohol, glyceryl stearate, stearic acid, octadecyl amine and polyethylene glycol-polylactic acid segmented copolymer.
2. 2. The aqueous coating composition of claim 1 wherein the first cellulose has a molecular weight of 1 x 10 4 ~5×10 4 g/mol; And/or the second cellulose has a molecular weight of 0.8X10 5 ~5×10 5 g/mol; And/or the mass ratio of the first cellulose to the second cellulose is 1 (0.5-3.5).
3. 3. The aqueous coating composition of claim 1, wherein the slow release aid comprises octadecanoic acid and octadecylamine; and/or the mass ratio of the octadecanoic acid to the octadecylamine is 1 (0.5-2).
4. 4. The aqueous coating composition according to claim 1, wherein the nano layered silicate mildew preventive is prepared by intercalating a mildew preventive material between montmorillonite layers using montmorillonite as a carrier.
5. 5. The water-based coating composition according to any one of claims 1 to 4, which comprises the following components in parts by mass: 8-22 parts of emulsion, 0.2-0.6 part of thickener, 0.8-1.8 parts of slow-release auxiliary agent, 0.5-2 parts of nano layered silicate mildew inhibitor, 22-65 parts of filler, 1.5-17.5 parts of auxiliary agent and 10-50 parts of water.
6. 6. The aqueous coating composition of claim 5, wherein the filler comprises titanium dioxide, kaolin, and calcite; and/or, the auxiliary agents include multifunctional amine auxiliary agents, dispersants, defoamers, bactericides, preservatives, antifreeze agents, and film forming auxiliary agents.
7. 7. The aqueous coating composition according to claim 6, which comprises the following components in parts by mass: 8-22 parts of emulsion, 0.2-0.6 part of thickener, 0.8-1.8 part of slow release auxiliary agent, 0.5-2 parts of nano layered silicate mildew inhibitor, 5-15 parts of titanium dioxide, 7-15 parts of kaolin, 10-35 parts of calcite, 0.1-0.5 part of multifunctional amine auxiliary agent, 0.05-1 part of dispersing agent, 0.1-3 parts of defoaming agent, 0.2-2 parts of bactericide, 0.01-1 part of preservative, 0.05-5 parts of antifreezing agent, 1-5 parts of film forming auxiliary agent and 10-50 parts of water.
8. 8. A method for preparing the aqueous coating composition according to any one of claims 1 to 7, comprising the steps of: Mixing the emulsion, the thickening agent, the slow-release auxiliary agent, the nano lamellar silicic acid mildew inhibitor, the filler, the auxiliary agent and water to obtain the water-based coating composition.
9. 9. A mildew-resistant coating, characterized in that it is prepared from the aqueous coating composition according to any one of claims 1 to 7.
10. 10. Use of the aqueous coating composition of any one of claims 1 to 7 or the mildew-resistant coating of claim 9 in the construction field.

Description

Water-based paint composition and preparation method and application thereof Technical Field The invention relates to the technical field of coatings, in particular to a water-based coating composition, a preparation method and application thereof. Background In the field of building coatings, water-based coatings have become a mainstream product in the market due to the advantages of environmental protection, low emission of Volatile Organic Compounds (VOCs), and the like. However, the water-based paint has the problem of insufficient mildew resistance in practical application, especially in a humid environment or in a long-term use process, mold is easy to grow, so that the wall surface is discolored and mildewed, and the attractiveness and the service life are affected. At present, in order to improve the mildew-proof performance of the water-based paint, the most commonly used method is to add chemical mildew-proof agents such as BCM (2- (thiocyanomethylthio) benzothiazole), OIT (isothiazolinone), IPBC (iodopropynyl butyl carbamate) and ZPT (zinc pyrithione), but the mildew-proof agents have irritation, toxicity and environmental protection to human bodies and are poor in environment friendliness, small molecules in the mildew-proof agents are easy to migrate and separate out, so that the problems of short mildew-proof aging, paint film discoloration (reduced whiteness), poor thermal storage stability and the like are caused, and the application of the mildew-proof agents in the water-based paint is limited. In order to ensure the environmental protection of the paint, the prior art discloses an antibacterial environmental protection emulsion paint, wherein the antibacterial mildew resistance can be improved by adding a chitosan compound which is obtained by crosslinking and compounding a C 3N4/TiO2 compound and modified porous chitosan microspheres, and the antibacterial mildew resistance is improved by discarding the traditional mildew inhibitor, but the antibacterial mildew resistance mechanism and the workability are obviously insufficient. Specifically, the antibacterial and mildew-proof mechanism mainly depends on chitosan complex, and the lack of a long-acting slow release design may lead to weakening of the mildew-proof effect with time, and the persistence of the mildew-proof effect is still insufficient. Disclosure of Invention The present invention aims to solve at least one of the above technical problems in the prior art. Therefore, the invention aims to provide a water-based paint composition, which is characterized in that a slow-release network is constructed by introducing a nano lamellar silicic acid mildew inhibitor and matching with a specific thickening agent and a slow-release auxiliary agent, so that a mildew-proof system with a slow-release effect is formed, long-acting mildew prevention is realized, and the environmental protection problem brought by the traditional chemical mildew inhibitor is solved. A second aspect of the present invention is to provide a method of preparing an aqueous coating composition. A third aspect of the present invention is to provide a mildew-resistant coating. A fourth aspect of the present invention is to provide an aqueous coating composition and the use of a mildew-resistant coating in the field of construction. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the first aspect of the invention provides a water-based coating composition comprising an emulsion, a thickener, a slow release aid, a nano layered silicic acid mildew inhibitor, a filler, an aid and water; The thickener comprises first cellulose and second cellulose, the molecular weight of the first cellulose is different from that of the second cellulose, and the slow release auxiliary agent comprises at least one of cetyl alcohol, glyceryl stearate, stearic acid, octadecyl amine and polyethylene glycol-polylactic acid segmented copolymer. According to the water-based paint composition, the nanometer layered silicate mildew preventive is introduced, a mildew preventive system with a slow-release effect is constructed by combining a specific thickener and a slow-release auxiliary agent, the release speed of the mildew preventive is effectively adjusted by a network structure formed by cellulose with different molecular weights and the slow-release auxiliary agent and by matching with the slow-release effect of the slow-release auxiliary agent, the durability of the mildew preventive effect is improved, and the long-term stable release of mildew preventive components is realized. The mildew-proof system in the water-based paint composition thoroughly abandons the traditional mildew-proof agent with poor environmental protection, short mildew-proof aging, easy color change (reduced whiteness) of a paint film and poor thermal storage stability, and fundamentally solves the problems of short mildew-proof effect and high environmental protect