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以H12MDI(4,4′-二环己基甲烷二异氰酸酯)和不同Mr(相对分子质量)的PPG(聚丙二醇醚)为原料、DBTDL(二月桂酸二丁基锡)为催化剂和A1170[双-(γ-三甲氧基硅丙基)胺]为封端剂,合成了SPU(端硅烷基聚氨酯)预聚物。研究结果表明:SPU预聚物的合成包括PU预聚物的合成和封端反应两个阶段;PU(聚氨酯)预聚物的合成反应速率随催化剂用量增加而加快,当催化剂用量约为50 mg/kg、反应温度为80℃和反应时间为4 h时,PU预聚物的合成反应可基本完成;封端反应的最佳温度为70℃,反应3 h后体系—NCO含量可降至0;通过调节R值[即n(—NCO)/n(—OH)]和PPG的Mr,可使SPU预聚物的黏度控制在56.70~229.92 Pa·s范围内。
Using DBTDL (dibutyltin dilaurate) as catalyst and A1170 [bis- (γ) as raw materials, H12MDI (4,4’-dicyclohexylmethane diisocyanate) and different PPG (polypropylene glycol ether) - trimethoxysilylpropyl) amine] as a capping agent, an SPU (terminal silylurethane) prepolymer was synthesized. The results show that the synthesis of SPU prepolymer includes two stages: synthesis of PU prepolymer and end-capping reaction. The synthesis reaction rate of PU prepolymer increases with the increase of catalyst dosage. When the amount of catalyst is about 50 mg / kg, the reaction temperature is 80 ℃ and the reaction time is 4 h, the synthesis reaction of PU prepolymer can be basically completed; the best temperature of the end-capping reaction is 70 ℃, the content of -NCO can be reduced to 0 ; By adjusting the R value [ie n (-NCO) / n (-OH)] and PPG Mr, SPU prepolymer viscosity can be controlled in the 56.70 ~ 229.92 Pa · s range.