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Synergistic Effects and Mechanism of Modified Silica Sol Flame Retardant Systems on Silk Fabric

机译：改性硅溶胶阻燃体系对真丝织物的协同作用及其机理

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The nano-silica sol was prepared by sol-gel method, and the boric acid, urea, cyanoguanidine, melamine cyanurate (MCA), 1-hydroxyethane 1,1-diphosphonic acid (HEDP), and 6H-dibenz (C,E) (1,2) oxaphosphorin-6-oxide (DOPO) were added to the silica sol to modify the flame retardant through physical doping and chemical bonding. According to the formula proposed by Lewin, the calculation of flammability parameters were obtained by the limiting oxygen index meter, the micro calorimeter, the vertical burner, and the thermogravimetric analyzer proved that there was a synergistic or additive effect between the B/N/P flame retardant and the silica sol. Fourier transform infrared (FT-IR) spectrum, scanning electron microscopy, and pyrolysis gas chromatography-mass spectrometry were used to characterize the morphology, structure, and pyrolysis products of treated silk fabric and residues after combustion. The results show that the flame retardancy of silica-boron sol is mainly caused by endothermic reaction and melt covering reaction. Silicon-nitrogen sol acts as a flame retardant through endothermic reaction, release of gases, and melting coverage. Silicon-phosphorus sol achieves flame retardancy by forming an acid to promote formation of a carbon layer and melting coverage. Silica sol and other flame retardants show excellent flame retardanty after compounding, and have certain complementarity, which can balance the dosage, performance, and cost of flame retardants, and is more suitable for industrial development.
机译：通过溶胶-凝胶法制备了纳米二氧化硅溶胶，硼酸，尿素，氰基胍，三聚氰胺氰尿酸酯（MCA），1-羟基乙烷1,1-二膦酸（HEDP）和6H-苯甲酸酯（C，E）将（1,2）氧杂磷酰六氧化物（DOPO）添加到硅溶胶中，以通过物理掺杂和化学键合改性阻燃剂。根据Lewin提出的公式，通过极限氧指数仪，微热量计，立式燃烧器和热重分析仪对可燃性参数进行了计算，证明了B / N / P之间存在协同或累加作用。阻燃剂和硅溶胶。用傅里叶变换红外光谱，扫描电子显微镜和热解气相色谱-质谱法表征经处理的丝织物的形态，结构和热解产物以及燃烧后的残留物。结果表明，硅硼溶胶的阻燃性主要是由吸热反应和熔体覆盖反应引起的。硅氮溶胶通过吸热反应，释放气体和熔化覆盖物起阻燃剂的作用。硅磷溶胶通过形成酸来促进碳层的形成和熔融覆盖，从而实现了阻燃性。硅溶胶和其他阻燃剂混合后表现出优异的阻燃性，并具有一定的互补性，可以平衡阻燃剂的用量，性能和成本，更适合工业发展。

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