溶剂均相法合成芳香族水性聚氨酯乳液

Study on the Synthesis of Aromatic Waterborne Polyurethane Latex in the Uniform Solvent System

探讨了用溶剂均相法合成水性聚氨酯乳液的方法,并在反应速率、操作性和可重复性等方面与常用的本体法进行了对比。实验结果表明,溶剂均相法合成水性聚氨酯乳液的反应速率比本体法的反应速率慢,需在反应体系中加入0.1%的过渡金属有机化合物-有机胺复合催化剂加以改进。改进后的溶剂均相法反应重现性好,对环境的敏感度低。实验结果还表明,用二乙烯三胺代替乙二胺扩链,材料的拉伸强度和耐水性均有改善。

A new method of synthesis of waterborne polyurethane latex in uniform solvent system was introduced and was compared with the normal method of synthesis of waterborne polyurethane without solvent in the respect of reaction velocity, system viscosity, maneuverability and reappearance. The results showed that the reaction velocity of TDI with PPG in uniform solvent system was much slower than that without solvent, and that the use of 0.1% complex catalyst （organic transition metal compound with organic amine compound） to improve the reaction velocity was needed. With the complex catalyst in uniform solvent system, the reactions preserved better reappearance ability, and it was not very sensitive to the circumstance. The results also showed that when polyamine was used as chain extender, the obtained polyurethane materials had higher tensile strength and better water resistance than that of usual diamine chain extender.