A preparation method of an ion self-assembled hydroxyapatite-chitosan coated ammonium polyphosphate flame retardant

By coating hydroxyapatite and chitosan on the surface of ammonium polyphosphate using ion self-assembly technology, a dense hydrophobic core-shell structure of three-source integrated flame retardant is formed, which solves the problems of PP flammability and flame retardant performance degradation in humid environments, and achieves efficient and long-lasting flame retardant effect and improved mechanical properties.

CN122167826APending Publication Date: 2026-06-09BEIJING INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING INST OF TECH
Filing Date
2026-03-31
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing polypropylene (PP) materials are flammable and their flame retardant properties decrease in humid environments. Traditional flame retardants have poor dispersibility in the matrix, which affects their mechanical properties.

Method used

An ion self-assembly technique was used to perform layer-by-layer self-assembly of positive and negative ions on the surface of ammonium polyphosphate (APP), coating it with hydroxyapatite (HAP) and chitosan (CS) to form a dense, hydrophobic core-shell structure, thus constructing a three-in-one flame retardant.

Benefits of technology

It improves the dispersibility and water resistance of flame retardants in PP, forms a stable expanded char layer, and enhances the flame retardant and mechanical properties of PP, making it suitable for humid environments.

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Abstract

The application belongs to the cross field of surface modification and flame retardant technology, and particularly relates to a preparation method of ion self-assembled hydroxyapatite-chitosan coated ammonium polyphosphate flame retardant. The application realizes the layer-by-layer self-assembly coating of positive and negative ions on the surface of APP through the ion self-assembly technology, and effectively enhances the thermal, water shielding effect and thermal stability of the coating shell. The ion self-assembled three-source integrated flame retardant constructed in this way not only has a more compact and more hydrophobic core-shell structure, can greatly inhibit the migration and precipitation of APP, but also the synergistic charring effect generated by the three-source integrated flame retardant will form a stronger and more stable intumescent carbon layer, so that the efficient and durable flame retardation of PP can be realized at a lower addition amount, and the material still maintains excellent flame retardation performance after 7-day boiling experiment; meanwhile, the flame retardant also better maintains the mechanical properties of the PP matrix itself.
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