Ultra washing durable flame retardant coating for cotton fabric by the covalent bonding and interface polymerization-Sheng Zhang

Due to fire hazards and environmental concerns, considerable attention has been paid to the design of durable flame retardant fabrics. In this work, a formaldehyde-free flame retardant cotton fabric (Cotton-PEI/APP-TMC) with ultra washing durability was prepared via covalent bonding of ammonium polyphosphate (APP) and polyethyleneimine (PEI) followed by the interface polymerization between PEI and trimesoyl chloride (TMC). The prepared fabric exhibited excellent flame retardancy with a limiting oxygen index value (LOI) of 42.0 % and a damaged length of less than 40 mm in the vertical flammability test (VFT). Besides, the cotton-PEI/APP-TMC sample was not ignited in the 50 kW/m2 cone calorimeter test with a dramatic decrease in both the peak heat release rate and total heat release. Even after 300 washing cycles, the cotton-PEI/APP-TMC sample had an LOI value of 35.3 % and was still self-extinguishing in VFT. It was demonstrated that the interface polymerization between PEI and TMC stabilized the flame retardant coating and shielded the Na+ during washing cycles, which endowed the fabric with durable flame retardancy. It is expected this work paves a promising application prospect for the fabrication of bio-safe durable flame retardant cotton fabrics.

共价键合界面聚合的棉织物超耐洗阻燃涂层

由于火灾隐患和环境问题，人们对耐用阻燃织物的设计给予了相当大的关注。在这项工作中，通过聚磷酸铵（APP）和聚乙烯亚胺（PEI）的共价键合，然后PEI和均苯三甲酰的界面聚合，制备了一种具有超耐洗性的无甲醛阻燃棉织物（Cotton-PEI/APP-TMC）。氯化物 (TMC)。制备的织物表现出优异的阻燃性，极限氧指数值（LOI）为42.0%，垂直可燃性测试（VFT）的损伤长度小于40mm。此外，棉-PEI/APP-TMC 样品在 50 kW/m 2锥形量热仪测试，峰值放热率和总放热均显着降低。即使经过 300 次洗涤循环，棉-PEI/APP-TMC 样品的 LOI 值仍为 35.3%，并且在 VFT 中仍能自熄。结果表明，PEI 和 TMC 之间的界面聚合稳定了阻燃涂层并在洗涤循环期间屏蔽了 Na +，从而赋予织物持久的阻燃性。预计这项工作为生物安全耐用阻燃棉织物的制造铺平了广阔的应用前景。

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