Two-component waterborne polyurethane coatings

摘要

A polyaziridine introduced into a two-component waterborne polyurethane dispersion coating system increases the cure rate of a coating composition formed from the coating system.

主权项

1. A process for increasing the cure rate of a two-component waterborne polyurethane dispersion coating, comprising:
introducing a polyaziridine into a coating system comprising: a hydrophilically-modified water-dispersible polyisocyanate; a polyol dispersed in water, optionally, in the presence of one or more organic solvents; and optionally, one or more additives or auxiliary agents; wherein the quantity of polyaziridine introduced comprises 0.42 to 0.85 percent by weight of the coating system and the introduction of the polyaziridine decreases the time-to-cure by at least 35 percent.