POLYURETHANE RESIN-FORMING COMPOSITION AND HYDROINFLATING WATER-SEALING MATERIAL FOR STEEL SHEET PILE

摘要

Disclosed is a polyurethane resin-forming composition containing: an aromatic isocyanate-terminated pre-polymer (a1); one or more aliphatic organic polyisocyanate compounds (a2) chosen from a specified group; and an organic polyisocyanate composition for waterproofing (A) with an isocynanate group content and ratio number within a set range and an amine polyol (B) with a nominal average functionality of 3-6, wherein the ratio of isocyanate group to hydroxyl group thereof is within a specified range. Here, the pre-polymer (A1) is a reaction product of an aromatic polyisocyanate (a11) and a polyether polyol (a12), and the polyether polyol (a12) comprises a polyethyl polyol (a12-1) with a nominal average functionality of 2 and oxyethylene group content within a specified range, and a polyethyl polyol (a12-2) with a nominal average functionality of 3 and oxyethylene group content within a specified range.