Revolutionizing textile safety: advanced flame retardant and thermal stability with HAp–AMP coatings

This study investigates the enhancement of thermal stability and flame-retardant properties of textile materials through the incorporation of hydroxyapatite grafted with varying percentages of aminotrimethyl phosphonate (HAp–AMP). Using a MATHIS type SV manual coating machine, textiles were treated with different concentrations of AMP–HAp (2.5, 5, 10 and 20%) in a polyamide (PA) matrix. The mechanical properties, thermal stability and flame resistance of the treated fabrics were evaluated through standardized tests, including tensile strength and elongation measurements according to NF EN ISO 13934-1: 2013, thermogravimetric analysis, and flame tests per NF EN ISO 6940:2004–08. The results indicate significant improvements in the thermal and flame-retardant performance of the coated fabrics. Higher concentrations of AMP–HAp demonstrated superior resistance to thermal degradation and flame propagation, with the PA + 15 AMP–HAp sample showing the most robust performance. Scanning electron microscopy confirmed the formation of a uniform and dense coating layer, contributing to the enhanced properties. The study concludes that AMP–HAp coatings effectively improve the flame retardancy and durability of textiles, making them suitable for applications requiring high thermal and fire resistance.