摘要： 以六亚甲基二异氰酸酯(HDI)为原料，从多异氰酸酯的结构出发，研究开发了既拥有 3.0 平均官能团数又具有超低黏度特性的三聚体型多异氰酸酯，并且对使用多异氰酸酯三聚体的涂料的凝胶率、涂膜硬度、耐候性、耐热性等进行了测定。 结果表明:三聚体型聚氨酯结构和平均官能团数对提高低黏度涂料的固化特性、耐候性起着非常重要的作用。 超低黏度的三聚体型多异氰酸酯可用于配制高固含量涂料，可改善涂膜的表观。

关键词: 超低黏度, 高固含, 多异氰酸酯

Abstract: A super low viscosity polyisocyanate as trimer( Duranate^TM TLA)based on hexmethylene diisocyanate (HDI) was prepared. As viewed from the structure of the polyisocyante. the Duranate^TM TLA having average number of isocyanate functional group 3 and low viscosity was prepared. The curing performance(e.g., crosslinking density and film hardness) accelerated weatherability and thermostat of the coatings based on Duranate^TM TLA were investigated. The results showed that the isocyanurate structure and the number of functional groups played important roles in curing performance and weatherability. The Durante^TM TLA with super low viscosity was useful for high solid coatings showing improved appearance.

Key words: super low viscosity, high solid, polyisocyanate