ONE-COMPONENT TYPE CURABLE COMPOSITION AND ONE-COMPONENT TYPE WATERPROOFING MATERIAL

摘要

A one-component type curable composition includes: an isocyanate group-containing urethane prepolymer (A) obtained by allowing a polyoxyalkylene-based polyol (a-1) having a number average molecular weight of 1,000 or more and less than 3,000, a polyol (a-2) having a number average molecular weight of less than 1,000, an epoxy (meth)acrylate (a-3) containing two or more hydroxyl groups in one molecule, and isophorone diisocyanate (a-4) to react with each other; a compound (B) having an oxazolidine ring: a first curing accelerator (C) configured to accelerate a reaction between at least one of a secondary amino group or a hydroxyl group generated by hydrolysis of the (B) and an isocyanate group of the (A); and a second curing accelerator (D) configured to accelerate the hydrolysis of the (B).

主权项

1. A one-component type curable composition, comprising:
an isocyanate group-containing urethane prepolymer (A) obtained by allowing a polyoxyalkylene-based polyol (a-1) having a number average molecular weight of 1,000 or more and less than 3,000, a polyol (a-2) having a number average molecular weight of less than 1,000, an epoxy (meth)acrylate (a-3) containing two or more hydroxyl groups in one molecule, and isophorone diisocyanate (a-4) to react with each other; a compound (B) having an oxazolidine ring; a first curing accelerator (C) configured to accelerate a reaction between at least one of a secondary amino group or a hydroxyl group generated by hydrolysis of the compound (B) having an oxazolidine ring and an isocyanate group of the isocyanate group-containing urethane prepolymer (A); and a second curing accelerator (D) configured to accelerate the hydrolysis of the compound (B) having an oxazolidine ring, wherein a cured product obtained by curing the one-component type curable composition with water satisfies the following (I) to (III): (I) type D durometer hardness specified under JIS K 6253-3 is D40 or more; (II) tensile strength at 23° C. specified under JIS A 6021 is 10 N/mm2 or more; and (III) accelerated weather resistance specified under JIS K 5658 complies with a first class.