Progress of ambient temperature crosslinking technology of waterborne polyurethane

The new progress of crosslinking modification technology at ambient temperature of waterborne polyurethane had been reviewed in this paper.The crosslinking systems and their mechanism were summarized in detail,including 9 kinds of crosslinking methods at ambient temperature,such as: 1 crosslinking between carbonyl and hydrazide group;2 crosslinking by Michael addition reaction;3 crosslinking of isocyanurate group;4 crosslinking between aziridinyl group or its derivative and carbonyl group;5 crosslinking of cycllic carbonates with amine;6 crosslinking by self oxidation of double bond in drying oil dispersed in waterborne polyurethane system;7 crosslinking between cycloaliphatic diepoxide and carbonyl group;8 crosslinking by chelation of metal salts with carbonyl and/or sulfo group and 9 hydrolytic condensation crosslinking of silylated polyurethane dispersions