| abstract |
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 hydroxy or mercapto group to dehydration condensation; and 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 hydroxy or mercapto group is shown by formula (I), where n = 1 to 5, and preferably 2 to 4; R 1 and R 2 are respectively alkyls containing 1 to 8 carbons; R 1 and R 2 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. |