A polyisocyanate composition, a method of preparation and a coating composition

By controlling the mass ratio of the iminooxadiazine dione-urea dione bond structure to the isocyanurate trimer in the polyisocyanate composition, and by combining it with a catalyst to regulate the reaction, a low-viscosity, high-crosslinking polyisocyanate composition was prepared, which solved the problems of insufficient viscosity and crosslinking in the prior art and improved the overall performance of the coating.

CN117534816BActive Publication Date: 2026-07-10WANHUA CHEMICAL (NINGBO) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WANHUA CHEMICAL (NINGBO) CO LTD
Filing Date
2022-08-01
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies struggle to maintain good crosslinking properties and film performance while reducing the viscosity of polyisocyanate compositions, especially when preparing high-end coatings where there are issues with insufficient crosslinking or poor thermal stability.

Method used

By controlling the mass ratio of iminooxadiazine dione-ureadione bonded structure to isocyanurate trimer in the polyisocyanate composition between 0.01 and 1:1, and by using both asymmetric and symmetric trimerizing catalysts, the reaction conditions are adjusted to generate appropriate amounts of iminooxadiazine dione-ureadione bonded structure and isocyanurate trimer, thus preparing a polyisocyanate composition with low viscosity and good crosslinking properties.

Benefits of technology

This study achieved low viscosity and good crosslinking properties in the polyisocyanate composition, improved the drying speed, hardness, and solvent-resistant wiping properties of the coating film, reduced solvent usage, and enhanced the environmental friendliness and overall performance of the coating composition.

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Abstract

The application discloses a polyisocyanate composition, a preparation method and a coating composition. The polyisocyanate composition comprises isocyanurate trimers and imino oxadiazole diketone-uretedione bond structures, and the mass ratio of the imino oxadiazole diketone-uretedione bond structures and the isocyanurate trimers is (0.01-1):1. The composition not only has a lower viscosity, but also can maintain good crosslinking properties, and can improve the comprehensive performance such as the paint film drying speed, the paint film hardness and the solvent wiping resistance.
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