Room temperature curing two-component coating composition, waterproofing agent, and waterproofing method

A room-temperature curing two-component coating composition with a urethane prepolymer and curing agent, optimized for molecular weight and equivalent ratios, addresses the issue of rapid reaction in isocyanate-terminated prepolymers, offering a prolonged pot life and enhanced mechanical properties.

JP2026091295APending Publication Date: 2026-06-03HODOGAYA CHEMICAL CO LTD +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
HODOGAYA CHEMICAL CO LTD
Filing Date
2026-02-16
Publication Date
2026-06-03

AI Technical Summary

Technical Problem

The rapid reaction between the main agent and curing agent in isocyanate-terminated prepolymers used in polyurethane waterproof materials makes it difficult to achieve a sufficient pot life for hand-applied urethane rubber-based coating materials.

Method used

A room-temperature curing two-component coating composition comprising a urethane prepolymer derived from a polyol and isophorone diisocyanate, with specific molecular weight and equivalent weight ratios, and a curing agent, which includes polyoxyalkylene polyols and a crosslinking agent, to achieve a prolonged pot life.

Benefits of technology

The composition provides a coating with a sufficiently long pot life, enabling easy application by hand and ensuring high tensile strength, tear strength, and elongation, while being safe for human health and the environment.

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Abstract

To provide a room-temperature curing two-component coating composition with a sufficiently long pot life. [Solution] A room-temperature curable two-component coating composition comprising a main component containing a urethane prepolymer and a curing agent, wherein the urethane prepolymer is a reaction product of a polyol and isophorone diisocyanate, the polyol contains at least a polyoxyalkylene polyol (excluding polytetramethylene ether glycol) with 2 or more hydroxyl groups per molecule, the ratio of polyoxyalkylene polyols with 3 or more hydroxyl groups per molecule to the total of polyoxyalkylene polyols with 2 or more hydroxyl groups per molecule (bifunctional PPG) and polyoxyalkylene polyols with 3 or more hydroxyl groups per molecule is less than 0.16 in terms of equivalent weight, the number-average molecular weight of the bifunctional PPG is less than 1500, and the equivalent weight ratio of the total amount of isocyanate groups of isophorone diisocyanate to the total amount of hydroxyl groups of the polyol is less than 1.85.
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