A polyisocyanate composition, coating composition and use

By controlling the proportion and structure of the polymer in the polyisocyanate composition, the balance between viscosity, crosslinking and thermal stability was solved, thereby improving the film performance of the coating composition.

CN119505173BActive Publication Date: 2026-07-10WANHUA CHEM GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WANHUA CHEM GRP CO LTD
Filing Date
2024-12-12
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies struggle to maintain good crosslinking and thermal stability while reducing the viscosity of polyisocyanate compositions, resulting in insufficient film performance of coating compositions.

Method used

By controlling the content ratio of polymers A, B, and C and the UV absorption peak height ratio in the polyisocyanate composition, ensuring 10≤b/(a+c)≤150 and 0.1≤y/(x+z)≤10, the composition contains isocyanurate groups, and the structures of polymers A, B, and C are specific, including urea diketone dimers, isocyanurate trimers, etc.

Benefits of technology

The polyisocyanate composition achieves a combination of low viscosity, good crosslinking properties, and thermal stability. After application, the coating composition significantly improves the gloss, appearance, and alcohol resistance of the coating film.

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Abstract

This invention provides a polyisocyanate composition, a coating composition, and an application. The polyisocyanate composition provided by this invention can achieve a balance of low viscosity, good crosslinking properties, and heat resistance. The coating film obtained based on the polyisocyanate composition provided by this invention can achieve a balance of good gloss, alcohol rubbing resistance, and appearance. The polyisocyanate composition contains isocyanurate groups and contains polymers A, B, and C. The mass contents of polymers A, B, and C in the polyisocyanate composition are a, b, and c, respectively, and satisfy 10 ≤ b / (a+c) ≤ 150. The polyisocyanate composition exhibits UV absorption peaks in the chromatogram obtained by gel permeation chromatography. The heights of the UV absorption peaks of polymers A, B, and C are x, y, and z, respectively, and satisfy 0.1 ≤ y / (x+z) ≤ 10.
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