| 摘要 |
PURPOSE: Provided is a polyurethane repairing material composition for wet curing without solvent effective in attachment, supplement and/or repair processes of concrete and/or steel frameworks in areas with high humidity. CONSTITUTION: The polyurethane composition comprises: as a principle material, a polyol combination resin blended with polyether polyol and polyester polyol and 4,4'-diphenylmethane diisocyanate modified polyisocyanate resin as a hardening agent. The composition further contains a reaction catalyst composed of a secondary amine and a tin component as an accelerating agent. The composition is useful for repairing and/or reinforcing a concrete structure or a steel framework by introducing the composition into crack portions of the framework.
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