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39. Phytic acid–urea doped hybrid sol–gel coating for flame retardancy of polyester/cotton

Author

Dong, Shuang, Lu, Lin-Xia, Huang, Yi-Ting, Zhao, Bing, Zhang, Jun, Cheng, Xian-Wei, and Guan, Jin-Ping

Abstract

It is highly desirable to construct a sustainable hybrid silica coating to enhance the flame-retardant (FR) properties of polyester/cotton (T/C) blend fabrics. In this study, a novel urea phytate salt was synthesized and used to prepare a phosphorus/nitrogen-doped hybrid silica sol system. The hybrid silica coating was then applied to a T/C fabric to develop a highly efficient FR-coated T/C fabric with improved washing durability. The surface morphology, size distribution and condensation degree of the hybrid silica sol particles were characterized. The thermal stability, heat release, flame retardancy and mode of action of the coated T/C fabrics were also investigated. The coated T/C fabrics exhibited self-extinguishing performance, with the damaged length decreasing from 30 to 8.5 cm and the limiting oxygen index increasing from 17.1 to 30%. The desirable flame retardancy of the coated T/C fabric was well maintained even after ten washing cycles. The remarkably inhibited heat release ability suggested a decreased fire hazard. A potential condensed-phase flame retardancy mechanism was proposed based on thermogravimetric and char residue analyses. This study presents an eco-friendly and efficient hybrid silica coating that effectively reduces the fire hazard of T/C fabrics.

Published
2024
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44. Facile Preparation of an Effective Intumescent Flame Retardant Coating for Cotton Fabric

Author

Cheng, Xian-Wei, Wu, Yan-Xiang, Hu, Bi-Qing, and Guan, Jin-Ping

Abstract

In the present study, phytic acid was used as an environmentally sustainable phosphorus-containing flame retardant (FR) to improve the flammability of cotton fabric. The facilely prepared approach is adequate to offer an intumescent FR system for cotton as phytic acid and triethanolamine could serve as the acid source and blowing agent and cellulose substrate may functional as a carbon source. The flame retardancy, thermal stability, heat and smoke generation and mechanical performance of cotton fabrics were evaluated. The cotton fabrics coated with phytic acid with 70 g/L at pH 5 had a weight gain of 15.1%, and self-extinguished via an intumescent charring mechanism in vertical burning test, and the textile structures of burned portion were well preserved. The intumescent FR coating also greatly reduced the heat and smoke generation ability of cotton, and enhanced its thermal stability at high temperature, but suffered from poor washing resistance. The present intumescent FR system based on phytic acid is an eco-friendly and sustainable production approach compared to the synthetically engineered chemicals.

Published
2024
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