A novel hydroxy silane coupling agent (HO-silane) was synthesized via Michael addition reaction between 2-hydroxyethyl acrylate and 3-mercaptopropyl-trimethoxysilane, which was then used to synthesize the silane-terminated polyurethane (SPU). The silane-terminated polyurethanes, which showed low viscosity due to the end-capping by HO-silane, could be chain-extended by butanediol to enhance the performance of SPU in non-solvent condition. The effects of chain extender, 1,4-butanediol, and NCO/OH molar ratio (R value) on the properties of silane-terminated polyurethane were investigated. The results show that the hydroxy silane coupling agent and the silane-terminated polyurethane that can be moisture-cured at ambient temperature were successfully synthesized. It is found that by introducing the 1,4-butanediol segment into SPU main chain, the viscosity of SPU was increased, but the tack free time of SPU was shortened, and the hardness and tensile strength of the moisture-cured SPU film were enhanced. As the R value increased, the tack free time of the silane-terminated polyurethane was prolonged, and the hardness and the tensile strength of the moisture-cured film were increased, but the elongation at break was decreased. When the amount of 1,4-butanediol was 10 wt% and the R value was 1.3, respectively, silane-terminated polyurethane with viscosity of 51,000 mPa·s (80% solid content) can be obtained. The tensile strength of the moisture-cured film was 1.1 MPa, and the elongation at break was 713.4%, which shows great potential for sealant and coating applications.

通过丙烯酸2-羟乙酯与3-巯基丙基-三甲氧基硅烷的迈克尔加成反应合成了一种新型羟基硅烷偶联剂（H2O-硅烷），然后将其用于合成硅烷封端聚氨酯（SPU）。硅烷封端的聚氨酯由于被 H2O-硅烷封端而表现出低粘度，可以用丁二醇扩链以提高 SPU 在非溶剂条件下的性能。扩链剂、1,4-丁二醇和 NCO/OH 摩尔比的影响 ( R值）对硅烷封端聚氨酯的性能进行了研究。结果表明，成功合成了可常温湿固化的羟基硅烷偶联剂和硅烷封端聚氨酯。发现通过在SPU主链中引入1,4-丁二醇链段，提高了SPU的粘度，但缩短了SPU的不粘时间，提高了湿固化SPU薄膜的硬度和拉伸强度。 . 随着R值的增加，硅烷封端聚氨酯的不粘时间延长，湿固化膜的硬度和拉伸强度增加，但断裂伸长率降低。当 1,4-丁二醇的量为 10 wt% 且R值分别为1.3，可获得粘度为51,000 mPa·s（80%固含量）的硅烷封端聚氨酯。湿固化膜的抗拉强度为1.1 MPa，断裂伸长率为713.4%，在密封胶和涂料应用中显示出巨大的潜力。