Electrophoretic coating with high corrosion resistance and preparation method thereof

By introducing sulfide-modified epoxy resin into epoxy resin to form a dense protective layer, the problem of photo-oxidative degradation of traditional epoxy resin coatings under ultraviolet light and moisture is solved, thereby improving the anti-corrosion performance and enhancing the mechanical properties of the coating.

CN121592228APending Publication Date: 2026-03-03XINLIHUA (SHANGHAI) NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202512045068.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-03-03

AI Technical Summary

Technical Problem

Traditional epoxy resin coatings are prone to photo-oxidative degradation under environmental factors such as ultraviolet light and humidity, which can lead to powdering, cracking, or decreased adhesion of the coating, making it difficult to maintain its protective function for a long time.

Method used

Introducing flexible or rigid sulfur-containing chains into epoxy resin and modifying the epoxy resin with thioethers forms a dense protective layer. The lone pair electron effect and steric hindrance of sulfur atoms enhance the density and mechanical properties of the coating.

Benefits of technology

It significantly improves the anti-corrosion performance of the coating, extends the corrosion resistance time, enhances the hardness and flexibility of the coating, improves the flame retardant performance, and meets the needs of different application scenarios.

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Abstract

The invention discloses a high-corrosion-resistance electrophoretic coating and a preparation method thereof, and belongs to the technical field of electrophoretic coatings. The preparation method of the coating comprises the following steps: S1, mixing epoxy resin, a thioether compound with an active group at the end position, a chain extender, triphenylphosphine, an organic solvent 2, an amino catalyst and a neutralizer, and carrying out heat preservation and chain extension to obtain thioether modified epoxy resin; s2, aminating, neutralizing and re-emulsifying the thioether modified epoxy resin in the step S1, an aminating agent, an organic solvent 1, a curing agent, a neutralizing agent and deionized water to obtain a high-corrosion-resistance emulsion; s3, mixing and grinding the thioether modified epoxy resin in the step S1 with pigment, a dispersing agent and deionized water to obtain high-corrosion-resistance color paste; s4, mixing the high-corrosion-resistance emulsion in S2 and the high-corrosion-resistance color paste in S3 according to the mass ratio of 4: 1 to 8: 1 to obtain the high-corrosion-resistance electrophoretic coating. And by adopting the thioether modified epoxy resin, the obtained coating has excellent corrosion resistance, mechanical property and flame retardant property at the same time.
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