Process for producing rapidly curable cold-setting polyurethane coating waterproofer

Abstract

The present invention provides a process for producing a rapidly curable cold-setting polyurethane coating waterproofer which permits the employment of a highly safe aromatic polyamine crosslinker, which is rapidly cured even in the absence of an organometallic catalyst to thereby give a coating film having excellent heat and water resistances, and which can retain a pot life suited for, especially, hand coating. A base composed of an isocyanate-terminated prepolymer comprising the product of reaction between tolylene diisocyanate and a polyoxypropylene polyol and/or a polyoxyethylenepropylene polyol is in-situ mixed with a curing agent containing an aromatic polyamine crosslinker composed of diethyltoluenediamine and a plasticizer, and the obtained mixture is subjected to coating and curing. The plasticizer is contained in the curing agent in an amount of 20 to 130 parts by weight per 100 parts by weight of the prepolymer of the base. The base is mixed with the curing agent in such proportions that the equivalent ratio of the NCO groups of the prepolymer contained in the base to the NH.sub.2 groups of the aromatic polyamine contained in the curing agent ranges from 0.8 to 2.0.

Dependencies are inferred from the claim text.