Polyisocyanate-Based Anti-Corrosion Coating

摘要

Anti-corrosion coating for metallic substrates obtainable by reacting an organic polyisocyanate with a compound containing isocyanate-reactive hydrogen atoms at an isocyanate index of between 1000 and 5000% in the presence of a trimerisation catalyst.

主权项

1. A polyisocyante based non-syntactic primer coating composition comprising the reaction product of (i) an organic polyisocyanate and (ii) a compound containing isocyanate-reactive hydrogen atoms wherein components (i) and (ii) are reacted at an isocyanate index of more than 1000% in the presence of a trimerisation catalyst; wherein the organic polyisocyanate is a semi-prepolymer or a prepolymer that is obtained by reacting (a) a polyisocyanate compound with (b) a compound containing isocyanate-reactive hydrogen atoms; and wherein component (ii) and component (b) may be the same or different and are selected from the group consisting of alcohols, glycols, polyether polyols, polyester polyols, mercaptans, amines, urea, and amides.