摘要
为提高硅橡胶的耐高温性能,确定最佳的实验配方,以乙烯基硅橡胶为基础胶,八氢基笼型倍半硅氧烷(T_8H_8)为交联剂,白炭黑为补强填料,纳米级氧化锡为耐热填料,制备出一种耐高温硅橡胶.该配方中T_8H_8为自行合成的耐高温硅橡胶交联剂,通过红外光谱(FTIR)、X射线衍射(XRD)、核磁共振氢谱(1HNMR)对T_8H_8结构进行表征,探究了不同配方对硅橡胶耐热性能的影响.结果表明,当乙烯基硅油用量为100 phr,T_8H_8中Si—H与乙烯基硅橡胶中Si—Vi的摩尔比为4∶1,白炭黑添加量为15 phr,氧化锡添加量为8 phr时,硅橡胶的初始分解温度达到489.77℃,拉伸强度为4.06 MPa,剪切强度1.69 MPa.
To improve the heat resistance of silicone rubber,and to determine the best experimental formula,a type of heat resistant silicone rubber was prepared,using polymethyl-vinyl siloxane rubber as basic gum,octahydridospherosiloxane（T8H8） as crosslink agent,silica as reinforcing filler,nano SnO2 as heat-resistant filler.In this formula,T8H8 was self-synthesized as heat resistant silicone rubber crosslniking agent. The structure was characterized by means of Fourier Transform infrared spectroscopy（FTIR）,X-ray diffraction（XRD）,i1HMR. The effect of different formula on heat resistant of rubber was studied. Results showed that when the amount of polymethyl-vinyl siloxane oil,the mass ratio of Si—H and Si—Vi,the amount of silica,and SnO2 was 100 phr,4 ∶ 1,15 phr,and 8 phr,respectively,initial decomposition temperature of silicone rubber can reach 489.77 ℃,and its tensile strength and shear strength is 4.06 MPa,and 1.69 MPa.
作者
葛铁军
张瑾
GE Tiejun;ZHANG Jin(College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China)
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2018年第3期79-83,共5页
Materials Science and Technology
基金
辽宁省高等学校创新团队
塑料的高性能化及加工(LT2015022)
关键词
耐高温硅橡胶
八氢基笼型倍半硅氧烷
耐热性能
配方
强度
heat resistant silicone rubber
octahydridospherosiloxane
formula
heat resistance
strength
