POLYURETHANE-MODIFIED EPOXY RESIN METHOD FOR PRODUCING SAME EPOXY RESIN COMPOSITION AND CURED PRODUCT

摘要

Provided are a polyurethane-modified epoxy resin with good processing operability such as casting and impregnation in a composition state, a method for producing the same, and a composition thereof. Bisphenol-based epoxy resin (a) containing a secondary hydroxyl group having an epoxy equivalent of 150 to 200 g/eq and a hydroxyl equivalent of 2000 to 2600 g/eq is mixed with a medium molecular weight polyol compound (b) having an Mn of 200 or more, a polyisocyanate compound (c) and a chain extension Mn as an agent is modified with a low-molecular-weight polyol compound (d) of less than 200, and the epoxy resin (a) is used in an amount of 20 to 60% by weight based on the total amount of each component (a)(b)(c)(d) Thus, it is a polyurethane-modified epoxy resin comprising a polyurethane to which an epoxy resin (a) is added to both ends and/or one end.