Self-crosslinking exterior wall coating containing reinforcing fiber and preparation method thereof

By combining silicone modified acrylic emulsion with aqueous polyurethane emulsion and using silane modified nanosilica and reinforced fibers, a high-hardness self-crosslinked coating is formed, which solves the problems of low hardness and poor weather resistance of exterior wall coatings, and the preparation of high wear resistance, impact resistance and environmentally friendly coatings are achieved.

CN117965071BActive Publication Date: 2025-08-26CHENGDU HONRE PAINT MAKING CO LTD
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Patent Information

Application Number
CN202311798674.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-26
Publication Date
2025-08-26
Estimated Expiration
2043-12-26

AI Technical Summary

Technical Problem

The existing exterior wall coatings have low hardness, poor adhesion, and are prone to powdering and falling off, especially in areas with severe air pollution, poor weather resistance, solvent-based coatings are not environmentally friendly enough, and the cost of two-component polyurethane coatings is high, which limits its promotion and application.

Method used

Silicone modified acrylic emulsion is used to combine with aqueous polyurethane emulsion, silane modified nanosilica and reinforced fibers are added, and a high-hardness coating is formed through self-crosslinking reaction. The aminated lignin nanoparticles in the fibers are coated with the surface of the matrix fibers, improving the weather resistance, wear resistance and impact resistance of the coating.

Benefits of technology

It improves the weather resistance, wear resistance, impact resistance and hardness of the coating, enhances the high temperature, corrosion resistance and heat insulation properties of the coating, improves the uniformity and smoothness of the coating, and improves the environmental protection and construction convenience of the coating.

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Abstract

The invention discloses a self-crosslinking exterior wall coating containing reinforcing fibers and a preparation method thereof. The coating comprises the following components by mass: 10-20% water, 0.1-0.5% bentonite, 0.1-0.5% cellulose, 3-8% reinforcing fibers, 0.5-2% ethylene glycol, 0.5-1.5% dispersant, 0.1-0.5% wetting agent, 0.1-0.3% multifunctional additive, 15-25% titanium dioxide, 8-15% precipitated barium sulfate, 2-8% silane-modified nano-silica, 5-10% water-based polyurethane emulsion, 30-40% organosilicon-modified acrylic emulsion, 1-3% film-forming aid, 0.1-0.3% bactericide, 0.1-0.2% preservative, 0.5-1% mildew inhibitor, 0.3-1.1% defoaming agent, and 0.5-1.8% leveling agent. By compounding silicone-modified acrylic emulsion and water-based polyurethane emulsion, and adding silane-modified nano-silica and reinforcing fibers, the coating has excellent resistance to artificial weathering, wear resistance, impact resistance, corrosion resistance and high hardness.
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