The present invention is related to a polyurethane dispersant and a preparation method thereof. The polyurethane dispersant is terminated by a nitrogen-containing heterocyclic compound during synthesis. The nitrogen-containing heterocyclic compound is prepared by subjecting anhydride and a compound containing a primary amine and a secondary amine or a hydroxyl or mercapto group to dehydration condensation. The condensed product is the nitrogen-containing heterocyclic compound, containing a reactive hydrogen. The structural formula of the compound containing the primary amine and the secondary amine or hydroxyl or mercapto group is shown as follows:
wherein n=1 to 5, and preferably 2 to 4, R1 and R2 are respectively alkyls containing 1 to 8 carbons, R1 and R2 are independent of each other or connected by a chemical bond to form one or more saturated or unsaturated 4-member to 8-member rings, and X represents N, O, or S.
本发明涉及一种聚
氨酯分散剂及其制备方法。该聚
氨酯分散剂在合成过程中由含氮
杂环化合物终止。含氮
杂环化合物的制备方法是将酸酐和含有
伯胺和仲胺或羟基或巯基的化合物进行脱
水缩合。缩合产物为含氮
杂环化合物,其中含有活性氢。含有
伯胺和仲胺或羟基或巯基的化合物的结构式如下:
其中 n=1 至 5,最好是 2 至 4,R1 和 R2 分别是含 1 至 8 个碳原子的烷基,R1 和 R2 相互独立或通过
化学键连接形成一个或多个饱和或不饱和的 4 至 8 元环,X 代表 N、O 或 S。