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<p>Polyamide 6 (PA6) fabric is widely used in textile applications owing to its excellent physical and mechanical properties. However, its high flammability and severe melt-dripping behavior during combustion significantly limit its application in fire-sensitive fields. In this study, a phosphorus–nitrogen-containing polysiloxane flame retardant (NPSi) was synthesized and synergistically combined with thiourea (TU) to enhance the flame retardancy of PA6 fabric. The thermal stability, combustion behavior, mechanical properties, and flame-retardant mechanisms of the treated PA6/TU/NPSi fabric were systematically investigated. Owing to the synergistic interaction between TU and NPSi, the flame retardancy of PA6 fabric was markedly improved, particularly with respect to melt-dripping suppression. The PA6/TU/NPSi fabric achieved a UL-94&#xa0;V-0 rating and exhibited a limiting oxygen index (LOI) of 29%. Compared with pristine PA6 fabric, the peak heat release rate (PHRR) and total heat release (THR) of the PA6/TU/NPSi-3 fabric decreased by 80.0% and 47.8%, respectively. This enhanced fire safety performance was primarily attributed to the formation of a dense and continuous char layer in the condensed phase, together with the release of non-combustible gases in the gas phase.</p>

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Preparation and Properties of a Novel TU/NPSi Multi-Element Synergistic Flame-Retardant System for PA6 Fabrics with Excellent Anti-Dripping Performance

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Yale Hu,
  • Xiaodi Song,
  • Yuanyuan Li,
  • Meijia Cheng,
  • Hao Jing,
  • Neng Qian,
  • Shuo Fan

摘要

Polyamide 6 (PA6) fabric is widely used in textile applications owing to its excellent physical and mechanical properties. However, its high flammability and severe melt-dripping behavior during combustion significantly limit its application in fire-sensitive fields. In this study, a phosphorus–nitrogen-containing polysiloxane flame retardant (NPSi) was synthesized and synergistically combined with thiourea (TU) to enhance the flame retardancy of PA6 fabric. The thermal stability, combustion behavior, mechanical properties, and flame-retardant mechanisms of the treated PA6/TU/NPSi fabric were systematically investigated. Owing to the synergistic interaction between TU and NPSi, the flame retardancy of PA6 fabric was markedly improved, particularly with respect to melt-dripping suppression. The PA6/TU/NPSi fabric achieved a UL-94 V-0 rating and exhibited a limiting oxygen index (LOI) of 29%. Compared with pristine PA6 fabric, the peak heat release rate (PHRR) and total heat release (THR) of the PA6/TU/NPSi-3 fabric decreased by 80.0% and 47.8%, respectively. This enhanced fire safety performance was primarily attributed to the formation of a dense and continuous char layer in the condensed phase, together with the release of non-combustible gases in the gas phase.