Polyurethane-modified epoxy resin, polyurethane-modified epoxy resin composition, cured product using the same, resin composition for fiber-reinforced composite material, and fiber-reinforced composite material wherein the new polyurethane-modified epoxy resin is used in casting materials, composite materials, structural adhesives, etc., and has high glass transition temperature, low viscosity, excellent fiber impregnation, and high tensile elasticity or tensile strength of the resin itself

• Main Author: HATTORI, KOICHI
• Format: Patent
• Language: Chinese; English
• Published: 01.05.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The present invention provides a composition using a new polyurethane-modified epoxy resin and its cured product. The new polyurethane-modified epoxy resin is used in casting materials, composite materials, structural adhesives, etc., and has high glass transition temperature, low viscosity, excellent fiber impregnation, and high tensile elasticity or tensile strength of the resin itself. Disclosed are an epoxy resin composition and a cured product using the same, wherein the epoxy resin composition is characterized in that it comprises a polyurethane-modified epoxy resin (A), a polyurethane-unmodified epoxy resin (B), and a curing agent (C) as essential components, and contains 20 to 70 wt% of component (A), 30.0 to 80.0 wt% of component (B), and 0.1 to 20.0 wt% of component (C) relative to the entire composition. The polyurethane-modified epoxy resin (A) contains a structure derived from polyol and a structure derived from polyisocyanate, and has a structure by reacting an isocyanate group structure at the