Low-viscosity silane modified polyether base rubber and preparation method thereof

The invention discloses low-viscosity silane modified polyether base rubber and a preparation method thereof. Isothiocyanate base silane terminates polyether, and a thiocarbamic acid ester unit is arranged inside the prepared base rubber. During preparation, 1 part by mole of hydroxyl-terminated polyether, 2.1-3 parts by mole of isothiocyanate base alkoxy silane, 0-2 parts by mole of catalysts and0-100 parts by mole of solvents are sequentially added into a reactor, react for 1-24 hours at the temperature ranging from -5 DEG C to 100 DEG C and then purified and dried to obtain the silane modified polyether base rubber. As the prepared base rubber is low in hydrogen bond strength, the viscosity of the base rubber is reduced, the production, potting and use process of a sealant is facilitated, and the base rubber has a good industrial prospect. 本发明公开了种低粘度的硅烷改性聚醚基胶及其制备方法，采用异硫氰酸酯基硅烷封端聚醚，所得基胶内部含有硫代氨基甲酸酯单元；制备时，在反应器中依次加入1摩尔份端羟基的聚醚，2.1~3摩尔份的异硫氰酸酯基烷氧基硅烷，0~2摩尔份催化剂，0~100摩尔份溶剂，于-5℃~100℃下反应1~24小时，再经纯化、干燥得到硅烷改性聚醚基胶。本发明所制得的