Abstract: The waterborne polyurethane(WPU) with tert-amine groups were prepared. The prepolymers having NCO and tert-amine were synthesized by the reaction of toluene-2,4-diisocyanate with polypropylene glycol, tert-ethanolamine and other multiols, then emulsified in dilute HCl of pH 5～6. The particle size data show that the tert-amine monomer with single hydroxyl is preferable to the dihydroxyl and trihydroxyl tert-amine. The final product WPU showes some characteristics of pseudoplastic fluid and its film has good water resistance. It is also found that increasing the amounts of tert-amine could remarkably improve the mechanical properties and widen the tanδ peak of the product.

Key words: waterborne polyurethane, preparation, dimethylethanolamine, rheological property, mechanical property