STUDY OF DEBLOCKING AND CROSS-LINKING REACTIONS OF A BLOCKED ISOCYANURATE CATIONOMER

A cationic adduct of a partly blocked hexamethylene isocyanurate and N -methyldiethanolamine was prepared and applied as a crosslinker in one -pack water-borne polyurethane system. The deblocking and crosslinking reactions were followed by FTIR, TGA and DSC techniques. Deblocking s tarted at about 100-degrees-C, while at higher temperatures urethane, allophanate, and urea linkages were formed. The efficiency of the cati onic crosslinker was evaluated by determining the insoluble part of th e crosslinked polyurethane ionomer films. Films of a good solvent resi stance were obtained using 15 wt% of the cationic crosslinker and 0.05 wt% of a catalyst at 130-degrees-C.