Matting curing agent for powder coating and preparation method thereof

By preparing a hydroxyalkylamide matting curing agent containing citric acid, 2-methyl-1,3-propanediol, anhydrous methanol, N-methylmonoethanolamine, and nano-titanium dioxide, the shortcomings of powder coatings in terms of matting and hardness are solved, and a coating film with high hardness and significant matting effect is achieved, which is suitable for applications with high decorative and hardness requirements.

CN117304726BActive Publication Date: 2025-11-25ANHUI HUIZHOU ZHENGJIE TECH CO LTD
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Patent Information

Application Number
CN202311442283.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-01
Publication Date
2025-11-25
Estimated Expiration
2043-11-01

AI Technical Summary

Technical Problem

Existing powder coating curing agents are insufficient in achieving matte finish and improving film hardness, especially hydroxyalkylamide series curing agents, whose performance in terms of decorative properties and impact resistance needs to be improved.

Method used

A hydroxyalkylamide matting curing agent was prepared using citric acid, 2-methyl-1,3-propanediol, anhydrous methanol, N-methylmonoethanolamine, and nano-titanium dioxide as raw materials. Through grafting, methyl esterification, and amidation reactions, a matting curing agent with 6 active hydroxyl groups was prepared, and nano-titanium dioxide was added as a molding aid.

Benefits of technology

This matting curing agent exhibits high hardness and a significant matting effect in the cured coating film, with a gloss level of 50-70%. It has excellent decorative properties and a higher hardness than traditional products, making it suitable for fields with high requirements for both decorativeness and hardness.

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Abstract

The present application relates to a kind of powder coating hydroxyalkylamide matting curing agent and its preparation method, the matting curing agent using including citric acid, 2-methyl-1,3-propanediol, dimethylbenzene, anhydrous methanol, N-methyl monoethanolamine, catalyst, nanometer titanium dioxide is reacted to obtain raw materials.In first, citric acid and 2-methyl-1,3-propanediol are grafted to carry out reaction, then the remaining four carboxyl groups of grafting are methyl esterification reaction, obtain methyl esterification product, then with N-methyl monoethanolamine acylation reaction obtains hydroxyalkylamide curing agent;Add nanometer titanium dioxide, fully mix and process to obtain the matting curing agent.The curing agent product functionality is higher, the hardness of coating film after curing is higher, and the boiling water resistance is excellent;And the coating film after curing has obvious matting effect, coating film gloss is basically reached 50-70%, and the decorative property is excellent.
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