Study on the Flame Retardancy and Thermal Decomposition Properties of RTV-2 Silicone Rubber Foam Containing Inorganic Flame Retardant
MA Li1,2, LIU Zhichao1,2, XIAO Yang1,2, KANG Furu1,2, YANG Kun1,2, DENG Jun1,2
1 College of Safety and Engineer, Xi’an University of Science and Technology, Xi’an 710054
2 Key Lab of Coal Fire Disaster Prevention in Shanxi Province, Xi’an 710054
Abstract: For the sake of preparing room temperature vulcanized silicone foam (SRF) with excellent flame retardancy, the flame retardant effects of inorganic flame retardants on SRF was studied. First, the SRF with maximum limit oxygen index(LOI) was selected by orthogonal experiment L9(34), and then the SRF composites were prepared by adding magnesium hydro-xide (MH), calcium carbonate (CC), and aluminum hydroxide (ATH), respectively. Then, the limit oxygen index instrument, smoke density tester and synchronous thermal analyzer were employed to test and analyze, and the apparent activation energy was calculated by the Coats-Redfern and Achar methods. The results revealed that the LOI of the SRF was 29.5%, the oxygen index increased after adding the inorganic flame retardant. Among them, the SRF composites with 30wt% ATH showed highest LOI of 34.9%. The smoke density decreased after adding the inorganic flame retardants, the smoke density decreased, and ATH exhibited best smoke inhibition. Both MH and ATH could contributed to enhance the thermal stability of SRF. When the addition amount of MH and ATH addition were both 20wt%, the mass residual rate was increased by 16.5% and 15.2%, respectively. Whereas, after adding 30wt% CC, the mass residual rate decreased by 4.7%, accompanied by decrease of the thermal stability. The greater the activation energy brought bout stronger flame retardancy. MH and ATH presented obvious flame retardancy at both the low temperature stage and the high temperature stage, while CC worked more effectively at the high temperature stage. The results indicated that ATH was the best flame retardant for SRF.
马砺, 刘志超, 肖旸, 康付如, 杨昆, 邓军. 含无机阻燃剂硅橡胶泡沫的阻燃及热分解特性研究[J]. 材料导报, 2019, 33(11): 1836-1841.
MA Li, LIU Zhichao, XIAO Yang, KANG Furu, YANG Kun, DENG Jun. Study on the Flame Retardancy and Thermal Decomposition Properties of RTV-2 Silicone Rubber Foam Containing Inorganic Flame Retardant. Materials Reports, 2019, 33(11): 1836-1841.
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2019, Vol. 33 
