WATERPROOF MATERIAL COMPOSED OF QUICK CURING POLYURETHANE COATING FILM CURABLE AT NORMAL TEMPERATURE, MENDING MATERIAL AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a waterproof material having moderate pot life, quick curability and excellent physical properties and strength without using designated chemical substances, etc., by using a main agent composed mainly of an isocyanate-terminated urethane prepolymer. ;SOLUTION: (A) A main agent composed mainly of an isocyanate-terminated urethane prepolymer composed of (i) methyl norbornanediisocyanate and (ii) a polyol is mixed with (B) an aromatic polyamine chain extender composed of (iii) diethyltoluenediamine and a curing agent containing the component (iii) at normal temperature and the mixture is applied to a coating object. Preferably, the content of free isocyanate group in the component A is 1.5-8.0 wt.% and the equivalent ratio of the isocyanate group in the main agent to the active hydrogen containing group reactive with the isocyanate group in the component B (amino group and hydroxyl group) is 0.8-1.8.;COPYRIGHT: (C)2000,JPO