A dendrimer nitrogen-phosphorus flame-retardant type water-based polyurethane microfiber leather and a preparation method thereof

By preparing dendritic macromolecular nitrogen-phosphorus flame retardants and waterborne polyurethane microfiber leather, the problem of poor compatibility of traditional flame retardants was solved, achieving efficient and long-lasting flame retardant effects and good overall performance.

CN122190037APending Publication Date: 2026-06-12HENAN INST OF ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN INST OF ENG
Filing Date
2025-12-22
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Traditional nitrogen-phosphorus flame retardants have poor compatibility with water-based polyurethane substrates, resulting in short-lasting flame retardant effects and affecting the overall performance of microfiber leather.

⚗Method used

A dendritic macromolecular nitrogen-phosphorus flame retardant was prepared by Michael addition and nucleophilic substitution reaction. The dendritic macromolecular compound was combined with aldehyde compound and phosphorus-containing aromatic compound to form a stable Schiff base compound. The compound was then prepolymerized with components such as isophorone diisocyanate to prepare flame-retardant waterborne polyurethane microfiber leather.

🎯Benefits of technology

It improves the compatibility between flame retardants and polyurethane substrates, ensures long-term stability of flame retardant performance, avoids migration and exudation, maintains the soft feel and mechanical properties of the material, and reduces the release of harmful fumes.

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Abstract

The application belongs to the technical field of polyurethane microfiber leather, and discloses a dendrimer nitrogen-phosphorus flame-retardant water-based polyurethane microfiber leather and a preparation method thereof. Methyl acrylate and ethylenediamine are subjected to repeated Michael addition reactions, and a branched reaction is performed by using methyl acrylate to prepare dendrimers with different degrees of branching. The dendrimers are subjected to a coupling reaction with aldehyde compounds, and then subjected to a nucleophilic addition with phosphorus-containing aromatic compounds to obtain a dendrimer nitrogen-phosphorus flame retardant. Then, the dendrimer nitrogen-phosphorus flame retardant is prepared into a dendrimer nitrogen-phosphorus flame-retardant water-based polyurethane microfiber leather together with isophorone diisocyanate and polytetrahydrofuran ether diol. The microfiber leather has the characteristics of high flame-retardant efficiency, less harmful smoke in the combustion process, and excellent mechanical properties.
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