支链型乙烯基硅油改性有机硅灌封材料的性能

采用支链型乙烯基硅油改性的端乙烯基硅油为灌封硅橡胶的基础胶,并分别以沉淀法和气相法白炭黑进行补强,研究了不同用量和品种白炭黑补强对灌封材料的黏度、力学性能、粘接性能和电学性能的影响。结果表明,当401-1500/411-4800=100/15时,灌封材料黏度适中并且力学性能较好;沉淀法白炭黑加入量在20phr～25phr时,灌封材料具有较好的工艺性能,拉伸强度最大值达到2.27MPa,剪切强度最大值达到4.64MPa,电绝缘性良好。

Investigation on Properties of Silicone Sealant Modified with Branched Vinyl Silicone Oil

Vinyl end silicone oil was modified with branched vinyl silicone oil,which was used as silicone sealant. Ratio of silicone oil blending was optimized to endow silicone sealant with better performance. Optimum silicone oil blending was filled with different amount of precipitated silica and fumed silica for reinforcement,and the effect of variety and amount of silica on viscosity,mechanical properties,shear strength and electrical properties was investigated. The results show that silicone sealant possesses optimal mechanical properties and processability,when the ratio of silicone oil is 401-1500/411-4800=100/15 with fillers,the tensile strength and shear strength could reach 2.27 MPa and 4.64 MPa in the presence of silicone sealant filled with 20 phr～25 phr precipitated silica,meanwhile,silicone sealant possesses electrical properties.