Synthesis of HDI/IPDI hybrid isocyanurate and its application in polyurethane coating

A hybrid isocyanurate was prepared by trimerization of HDI and IPDI, and the results identified the favorable linear relationship between the feed ratio of the starting monomers and the amount of each individual isocyanate incorporated into isocyanurate. The polyurethane coatings prepared with HDI/IPDI hybrid isocyanurates demonstrated faster drying speed, higher hardness and gloss and better distinctness-of-image than the analogous coatings prepared with cold-blends of HDI isocyanurate and IPDI isocyanurate.