Aqueous polyurethane fire-retardant coating and its preparation method and application

By using a flame retardant emulsion with a specific composition in waterborne polyurethane coatings, the problem of flame retardant performance degradation after washing has been solved, achieving long-term stability and high-efficiency flame retardancy of the coatings in the textile field.

CN121045936BActive Publication Date: 2026-07-10ZHEJIANG XINHUA CHEMICAL CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG XINHUA CHEMICAL CO LTD
Filing Date
2025-11-04
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

When waterborne polyurethane coatings are used in the textile industry, their flame retardant properties decrease significantly after washing, making it difficult to meet flame retardant standards. Existing flame retardants are difficult to disperse in waterborne coatings, and tend to agglomerate and fall off.

Method used

A flame retardant emulsion with a specific composition, including alkyl phosphines, nonionic dispersants, anionic dispersants, and anti-settling agents, is used. By controlling their mass ratio, a stable emulsion is formed, ensuring that the flame retardant is stably dispersed in waterborne polyurethane coatings for a long period of time.

Benefits of technology

This invention achieves excellent flame retardant properties in waterborne polyurethane coatings even after long-term storage and washing, making them suitable for textile applications that are frequently washed.

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Abstract

The application discloses a water-based polyurethane fire-retardant coating and a preparation method and application thereof. The coating adopts a fire-retardant emulsion including an alkyl hypophosphite salt as a fire-retardant component, and the fire-retardant emulsion further includes a dispersant, a sedimentation inhibitor, wherein the dispersant is composed of a non-ionic dispersant and an anionic dispersant; the non-ionic dispersant, the anionic dispersant and the sedimentation inhibitor are all specific types. By selecting specific types of the non-ionic dispersant, the anionic dispersant and the sedimentation inhibitor, and controlling the mass ratio of the non-ionic dispersant and the anionic dispersant, the fire-retardant emulsion can be stable, not aggregated in the coating, so that the coating has high stability, can maintain a stable and uniform emulsion state after long-time storage, and has excellent fire-retardant performance of the coating after long-term storage, and the fire-retardant performance of the coating is still excellent after washing, and can be applied to the fire-retardant textile field with high requirements on the fire-retardant performance after washing.
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