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<p>In this study, a high-performance flame-retardant coating was prepared using environmentally friendly biobased materials to impart long-lasting flame retardancy to cotton fabrics by an impregnation-dry curing process. The coating utilized the Schiff base reaction principle with hypophosphorous acid as the cross-linking agent to immobilize chitosan (CS) and oxidized starch (OS) on the surface of cotton fabrics by chemical grafting and electrostatic action. The results showed that the limiting oxygen index of the fabric reached 33.4% which using 2 mass% oxidized starch solution whit 1.5 mass% chitosan solution, which was 84.5% greater than that of the pure cotton fabric. In the vertical flame test, the samples achieved self-extinguishment. Compared with those of pure cotton, the total heat release and peak heat release rate decreased by 63.9% and 85.4%, respectively. Scanning electron microscopy images of the residue after cone calorimeter testing revealed that the OS and CS coatings formed an intumescent flame-retardant system. The thermogravimetric results demonstrated that the char residue content of the OS/1.5CS fabric under a N<sub>2</sub> atmosphere reached 40.5%. In addition, after 10 washes, the fabric still had good flame-retardant properties.</p>

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P/N biobased coatings to enhance the flame retardancy of cotton fabrics

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Yuming Zhou,
  • Fubin Luo,
  • Yumei Dai,
  • Denglong Chen,
  • Hongzhou Li

摘要

In this study, a high-performance flame-retardant coating was prepared using environmentally friendly biobased materials to impart long-lasting flame retardancy to cotton fabrics by an impregnation-dry curing process. The coating utilized the Schiff base reaction principle with hypophosphorous acid as the cross-linking agent to immobilize chitosan (CS) and oxidized starch (OS) on the surface of cotton fabrics by chemical grafting and electrostatic action. The results showed that the limiting oxygen index of the fabric reached 33.4% which using 2 mass% oxidized starch solution whit 1.5 mass% chitosan solution, which was 84.5% greater than that of the pure cotton fabric. In the vertical flame test, the samples achieved self-extinguishment. Compared with those of pure cotton, the total heat release and peak heat release rate decreased by 63.9% and 85.4%, respectively. Scanning electron microscopy images of the residue after cone calorimeter testing revealed that the OS and CS coatings formed an intumescent flame-retardant system. The thermogravimetric results demonstrated that the char residue content of the OS/1.5CS fabric under a N2 atmosphere reached 40.5%. In addition, after 10 washes, the fabric still had good flame-retardant properties.