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本文系统研究了自交链型阳离子聚氨基甲酸酯乳液的聚合机理。预聚物是 TDI 与聚醚的加成物,过量的异氰酸基团与链伸长剂二乙烯三胺反应,并通过环氧氯丙烷引入活性基团。通过常规化学方法红外光谱及热分析方法研究了预聚反应速率,链伸长反应在酮类介质的反应机理及大分子物的活性基团结构,其结果如下:预聚物的加成反应服从假一级反应,并计算出聚醚伯羟仲羟相对含量。酮胺反应证明为 Schiff 反应。通过环氧氯丙烷与二乙烯三胺的反应活化能,证明开环反应速率大于缩合反应速率。
This paper systematically studied the polymerization mechanism of self-crosslinking cationic polyurethane emulsion. The prepolymer is an adduct of TDI with a polyether. The excess isocyanato groups are reacted with the chain extender diethylenetriamine and introduced into the reactive groups via epichlorohydrin. The reaction mechanism of prepolymerization and chain extension reaction in ketones and the structure of the active groups of the macromolecules were studied by the conventional chemical methods of infrared spectroscopy and thermal analysis. The results are as follows: Addition reaction of prepolymer Fake a reaction, and calculate the relative content of polyether primary hydroxyl secondary hydroxyl. The ketamine reaction proved to be a Schiff reaction. The reaction activation energy of epichlorohydrin and diethylenetriamine proved that the ring-opening reaction rate was higher than the condensation reaction rate.