Polyurethane coatings using trimer of isophorone diisocyanatet

摘要

A trimer of isophorone diisocyanate (IPDI) was prepared considering its industrial applications and safety associated with it was compared to normal diisocyanates. The IPDI trimer has been characterized by PMR and IR spectroscopies, physical constant (melting point) and isocyanate content. This trimer was used for preparing polyurethane cast films as well as coatings using polyether polyols/polyethylene glycols (PEG) of varying molecular weights (PEG 200, 300, 400, 600). After conditioning the samples were subjected to various tests pertaining to coating such as, gloss, scratch resistance and flexibility, while mechanical tests include tensile strength, per cent elongation, Young's modulus and hardness and the performance are compared in the light of the molecular weight of PEG. Chemical resistance of these samples has been studied in industrially important acids, alkalis, and solvents and swelling characteristics are also studied.