含微胶囊化氢氧化铝有机硅泡沫阻燃抑烟特性

Flame Retardation and Smoke Inhibition of Silicone Foam with Microencapsulated Aluminum Hydroxide

传统提高有机硅泡沫(SiFs)材料阻燃抑烟方法存在与有机硅基体相容性差的问题,将阻燃抑烟剂微胶囊化是解决上述问题的有效手段。文中采用溶胶凝胶法制备出微胶囊化氢氧化铝(MATH),并对其性能进行表征,利用万能拉力试验机、极限氧指数测试仪、烟密度测试仪、锥形量热仪研究了含MATH时SiFs材料的力学性能和阻燃抑烟性能。结果表明,MATH的包裹效果较好,且微胶囊化后氢氧化铝(ATH)的热稳定性提高。MATH能在不降低SiFs材料力学性能的同时,有效提高其阻燃抑烟性能。此外,研究了含MATH时SiFs材料的热氧分解过程和炭渣结构,分析了MATH/SiFs材料的阻燃抑烟机理。

Traditional flame retardant has the problem of poor compatibility, it is a effective way to solve the problem by using microcapsule technology to modify the surface of flame retardant. Microencapsulated aluminum hydroxide(MATH) was prepared by sol-gel method and characterized. The mechanical properties, flame retardancy, and smoke suppression of SiFs containing MATH were studied by universal tensile tester, limiting oxygen index tester, smoke density tester, and cone calorimeter. These results show that the encapsulation effect is good and the thermal stability of the ATH is improved after microencapsulation. MATH could effectively improve the flame retardancy and smoke suppression of SiFs without reducing the mechanical properties. Besides, the thermal oxidative decomposition process, structure of residual carbon of SiFs were studied, and the flame retardant and smoke suppression mechanism of MATH/SiFs were analyzed.