Abstract Two different DOPO- Alkoxysilane based flame retardant compounds were synthesized and applied onto the polyamide 66 (PA66) fabric surfaces via sol-gel method to improve the thermal stability and flame retardant properties. The as prepared coatings exhibited a much higher char yield% compared to the pure PA66 and simultaneously suppressed the dripping tendency of PA66 in the vertical burning test. The fabric sample modified with 20 wt% of DOPO-APTES showed a significant reduction in the peak heat release rate (pHRR) by 36%, whereas the 20 wt% of DOPO-GPTMS treated fabric sample could manage a 20% reduction in pHRR. The supremacy of DOPO-APTES treated fabrics were due to the co-presence of P, Si, and N elements; where a DOPO structure showed a quenching effect in a vapor phase, and Si-compounds accelerated the limited charring of DOPO in a condensed phase and stabilized the char residues in a higher temperature range. Moreover, the as treated PA66 fabrics show some sort of wash durability and among them, the fabric sample treated with 20 wt% of DOPO-APTES can withstand against fierce laundering where it maintains UL-94V-1 rating even after 10 washing cycles.

中文翻译：

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DOPO-烷氧基硅烷的溶胶-凝胶涂层：聚酰胺 66 纺织品的防火功效

摘要 合成了两种不同的DOPO-烷氧基硅烷基阻燃化合物，并通过溶胶-凝胶法应用于聚酰胺66（PA66）织物表面，以提高热稳定性和阻燃性能。与纯 PA66 相比，所制备的涂层表现出更高的成炭率，同时抑制了 PA66 在垂直燃烧测试中的滴落趋势。用 20 wt% DOPO-APTES 改性的织物样品显示峰值热释放率 (pHRR) 显着降低了 36%，而 20 wt% DOPO-GPTMS 处理的织物样品可以控制 pHRR 降低 20%。DOPO-APTES 处理织物的优越性是由于 P、Si 和 N 元素的共同存在；其中 DOPO 结构在气相中显示出淬火效果，和 Si 化合物加速了 DOPO 在凝聚相中的有限炭化，并在较高的温度范围内稳定了炭残留物。此外，处理后的 PA66 织物显示出某种耐洗性，其中，用 20 wt% DOPO-APTES 处理的织物样品可以承受剧烈洗涤，即使在 10 次洗涤循环后仍保持 UL-94V-1 等级。