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用在线红外研究了端羟基聚丁二烯-丙烯腈多元醇(HTBN)与甲苯二异氰酸酯(TDI)反应生成端异氰酸酯基丁腈羟预聚体(ITBN)的动力学过程,并考察了预聚体物性以及固化后涂层的力学性能,该预聚体可作为固体火箭隔热涂层的一种新型基体树脂。研究表明,不同反应温度会影响预聚反应所形成的氨基甲酸酯中羰基的氢键化程度,低于80℃时,氢键氨基甲酸酯和不完善氢键氨基甲酸酯基团会随温度升高而增加;采用数理统计方法筛选出的Hyperbolic函数,可拟合实验数据,并可用来对比不同温度时的反应动力学特性,70～80℃是进行HTBN/TDI预聚反应的最适宜温度条件;通过该预聚体制备的涂层基体具有良好的工艺和力学性能。
The kinetics of the formation of terminal isocyanurate butyronitrile hydroxyl prepolymer (ITBN) from hydroxyl terminated polybutadiene-acrylonitrile polyol (HTBN) and toluene diisocyanate (TDI) was investigated by on-line infrared spectroscopy. Physical properties and mechanical properties of the cured coating, the prepolymer can be used as a solid rocket insulation coating a new matrix resin. Studies have shown that different reaction temperatures affect the degree of hydrogen bonding of the carbonyl groups in the urethane formed by the prepolymerization reaction. When the temperature is below 80 ° C, the hydrogen bond urethane and the imperfect hydrogen bond urethane groups Which increases with the increase of temperature. The Hyperbolic function screened by mathematical statistics method can fit the experimental data and can be used to compare the reaction kinetics at different temperatures, and 70-80 ℃ is the best for the prepolymerization of HTBN / TDI Suitable temperature conditions; the prepolymer prepared by the coating matrix has good process and mechanical properties.