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<p>In this paper, the flame retardant agent ammonium alcohol polyvinyl phosphate (AAPP) with abundance of nitrogen and phosphorous elements is&#xa0;synthesized. Through a simple impregnation and squeezing method, followed by high temperature baking, AAPP polymer chains are&#xa0;covalently grafted to lyocell, which makes the as-obtained AAPP/lyocell fibers exhibit highly efficient flame retardancy, as well as durability to water and alkali washing. 15%-AAPP/lyocell fibers achieve a limiting oxygen index (LOI) value of 39%. After 20 laundering cycles in water and 2% Na<sub>2</sub>CO<sub>3</sub> solution, the LOI could still remain at 32% and 29%, meeting the non-combustible grade requirements. Comparing with raw lyocell fibers, the peak heat release rate and total heat release for 15%-AAPP/lyocell fibers decrease to 10.34% and 47.12%, respectively. The flame-retardant mechanism of AAPP/lyocell is ascribed to nitrogen-phosphorus synergistic effect via dual condensed-phase and gas-phase pathways to suppress combustion. The flame retardant AAPP/lyocell fibers hold great promising in the field of protective clothing for military and firefighting occupations.</p>

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Durable nitrogen-phosphorus based flame retardant lyocell fiber

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Benbin Gu,
  • Caiyue Le,
  • Yueting Wu,
  • Zexin Lin,
  • Xiaobo Ye,
  • Bin Fang,
  • Yani Guo,
  • Yimin Sun

摘要

In this paper, the flame retardant agent ammonium alcohol polyvinyl phosphate (AAPP) with abundance of nitrogen and phosphorous elements is synthesized. Through a simple impregnation and squeezing method, followed by high temperature baking, AAPP polymer chains are covalently grafted to lyocell, which makes the as-obtained AAPP/lyocell fibers exhibit highly efficient flame retardancy, as well as durability to water and alkali washing. 15%-AAPP/lyocell fibers achieve a limiting oxygen index (LOI) value of 39%. After 20 laundering cycles in water and 2% Na2CO3 solution, the LOI could still remain at 32% and 29%, meeting the non-combustible grade requirements. Comparing with raw lyocell fibers, the peak heat release rate and total heat release for 15%-AAPP/lyocell fibers decrease to 10.34% and 47.12%, respectively. The flame-retardant mechanism of AAPP/lyocell is ascribed to nitrogen-phosphorus synergistic effect via dual condensed-phase and gas-phase pathways to suppress combustion. The flame retardant AAPP/lyocell fibers hold great promising in the field of protective clothing for military and firefighting occupations.