NEW TIN- AND MERCURY-FREE ORGANOMETALLIC CATALYSTS FOR CASE URETHANE APPLICATIONS

摘要

I socyanates react with compounds that have active hydrogens. For example, in coating applications, isocyanates are typically reacted with polyols to form polyurethanes, or with primary and secondary amines to form polyureas. Catalysis of the polyol/isocyanate reaction, which is often required to develop sufficient cure response, can be achieved with a variety of compounds. The most common catalysts for the polyol/isocyanate reactons include metal salts, organometallic compounds and tertiary amines. Generally speaking, bases, acids and even water can, in some cases, accelerate isocyanate reactions.