| abstract |
The invention relates to a novel polyurethane dispersant and a preparation method thereof. The polyurethane dispersant is terminated by a nitrogen-containing heterocyclic compound during synthesis, and the nitrogen-containing heterocyclic compound is composed of an acid anhydride and a primary amine and a secondary amine or Hydroxyl or mercapto compounds are dehydrated and condensed, and the condensed product, that is, the nitrogen-containing heterocyclic compound contains an active hydrogen and an imide group; the nitrogen-containing heterocyclic compound has the following general structural formula: Where n=1~5, R is an acid anhydride residue, R 1 and R 2 are alkyl groups containing 1 to 8 carbons (which may contain 1 N or O), and the two are either independent or connected by chemical bonds. One or several saturated or unsaturated 4-8 membered rings, X is N, O or S. |