单组分脱醇型密封胶的研制

以端羟基聚二甲基硅氧烷(107硅橡胶)为基胶、甲基三甲氧基硅烷和乙烯基三甲氧基硅烷为交联剂、纳米碳酸钙和气相法白炭黑为补强填料、硅烷偶联剂为增粘剂,有机钛为催化剂,制得单组分脱醇型室温硫化(RTV-1)硅橡胶。研究了基胶黏度,填料、交联剂、增粘剂的种类和用量对脱醇型RTV-1硅橡胶性能的影响。较佳配方为:100份黏度50 000 mm2/s的107硅橡胶、5份甲基三甲氧基硅烷与乙烯基三甲氧基硅烷按质量比7∶3复配的交联剂、0.4～0.6份自制氨基硅烷偶联剂。按此配方制得的RTV-1硅橡胶的性能较好。

Preparation of One-component Dealcoholized Sealant

Dealcoholized one component room temperature vulcanizing （ RTV-1 ） silicone rubber was pre-pared by α,ω-silanol terminated polydimethylsiloxane （107 silicone rubber） as the basic gel, methyltrime-thoxysilane and vinyltrimethoxysilane as the cross linker , and the nano-CaCO3 and fumed silica as fillers , si-lane coupling agent as the tackifier , organic titanium as the catalyst .The effects of the viscosity of 107 silicone rubber and the content of the fillers , crosslinker and coupling on the properties of RTV-1 silicone rubber were studied .The preferred RTV-1 silicone rubber formulation was that with 100 parts 107 rubber of 50 000 mPa· s viscosity , 5 parts of cross linker of methyltrimethoxysilane/vinyltrimethoxysilane （ mass ratio 7∶3 ） , 1 part of silane coupling agent with amino .The prepared RTV-1 silicone rubber had good performance .