Automotive leather with high bio-based content and preparation method

By optimizing the synergistic flame-retardant filler and wet coating of ammonium polyphosphate-modified chitosan and nano-montmorillonite, combined with chemical grafting and precise processes, a flame-retardant PU synthetic leather with high bio-based content was prepared. This solved the problems of low bio-based content and insufficient flame-retardant efficiency, and improved the moisture permeability and durability of automotive interiors.

CN121827095APending Publication Date: 2026-04-10ZHEJIANG HEXIN NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202610152251.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-03
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

In the existing technology, flame-retardant PU synthetic leather with high bio-based content has problems in automotive interior applications, such as low bio-based content, insufficient synergy between fillers and flame retardants, unstable wet microporous structure, poor dry-wet layer bonding, and weak high-temperature oil resistance. As a result, its mechanical properties and flame retardant efficiency cannot meet the high requirements of automotive interiors.

Method used

Ammonium polyphosphate-modified chitosan and nano-montmorillonite are used to form a synergistic flame-retardant filler. Combined with wet PU coating optimization and dry semi-dry bonding process, a dual-pore moisture-permeable structure is formed through hydrogen bond inhibitor treatment, gradient speed dispersion, and precise control of coagulation bath conditions. The flame retardant is fixed by chemical grafting to achieve high bio-based content and excellent flame-retardant performance.

Benefits of technology

It improves the bio-based content and flame retardant efficiency of synthetic leather, enhances moisture permeability and durability, meets the high requirements of automotive interiors, and solves the performance shortcomings of traditional synthetic leather in sustainable material applications.

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Abstract

The invention relates to the technical field of synthetic leather, in particular to automotive leather with high bio-based content and a preparation method thereof.The preparation method comprises the steps that ammonium polyphosphate modified chitosan and nano-montmorillonite are mixed, a hydrogen bond inhibitor is added to obtain flame-retardant composite filler, the flame-retardant composite filler, a hydrophilic copolymer, a dispersion system and a part of a polar organic solvent system are mixed, and the automotive leather with the high bio-based content is obtained. Carrying out rotating speed dispersion treatment to prepare flame-retardant pre-dispersed master batch; mixing the flame-retardant pre-dispersed master batch, the balance of polar organic solvent system and polyether type polyurethane resin to form wet-process slurry, coating the wet-process slurry on the velveteen-like base cloth layer, and feeding the wet-process slurry into a coagulating bath for phase separation to form a wet-process microporous layer; coating the release base material with the surface layer slurry, drying to form a dry surface layer, coating the bonding layer slurry, and carrying out semi-drying to form a dry bonding layer; the wet-process microporous layer and the dry-process bonding layer are subjected to hot-pressing lamination, curing treatment is performed after the release base material is separated, and the synthetic leather is obtained.According to the synthetic leather, excellent flame retardance, moisture permeability, durability and environmental protection performance of the leather for the automotive trim are achieved.
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