Abstract: All the polyols that can react with TDI and other isocyanates to form polyisocyonate prepoly-mer，including polyol monomers，castor oil and its alcoholysate and hydroxyl resin，can be clasified into the concept of“polyol precursor of prepolymer”.The“dolyol”should be divided into two groups—“polyol pre-cursor of prepolymer”and“hydroxy component for 2K PU coatings”.The basic function of polyol precursor in prepolymer and significance of research on the polyolprecursor are discused.

Key words: PU coatings, isocyanate, prepolymer, polyol precursor

摘要： 用于与 TDI等二异氰酸酯反应制备多异氰酸酯预聚物的各种多元醇，包括单体多元醇、蓖麻油及其醇解 物、多羟基树脂等，可以归纳于“预聚物的多元醇母体”的概念之中。PU涂料中的“多元醇”，应当明确区分为“预聚物 的多元醇母体”与“2KPU涂料的羟基组分”两类。阐述了多元醇母体在预聚物中的基本作用与注重对多元醇母体进 行研究的意义。

关键词: 聚氨酯涂料, 多异氰酸酯, 预聚物, 多元醇母体