Polyurethane modified epoxy resin research results

The properties of urethane-modified epoxy resins are highly valued by the industry because they can achieve good flexibility and elasticity and can be used to prepare adhesives, coatings, sealants and composites, etc., or to improve their performance. And achieved fruitful research results.

Epoxy resins have excellent adhesion and mechanical strength, but lack toughness and tend to be brittle; whereas polyurethanes have excellent flexibility and elasticity. Explore the use of polyurethane to modify epoxy resin, as early as the late 60s began. For example, Dow developed the polyurethane-modified epoxy structural adhesives first, and the composite materials such as matrix resins were used in the aerospace industry. Since the 1980s, the elastic epoxy resin series FEX developed by a company in Yokohama, Japan, has a wide molecular weight distribution, high resin viscosity, softness, flexibility, impact resistance, and colorless and transparent after curing, and has good compatibility with common epoxy resins.

There are also many domestic research and development units. For example, Shanghai Synthetic Resin Research Institute applied Epoxy Modified Polyurethane Resin to DW-4 ultra-low temperature adhesive. Tianjin Institute of Synthetic Materials HY-912 ultra-low temperature adhesive, using polyurethane modified epoxy resin. Heilongjiang Institute of Petrochemical Research has developed a polyurethane modified epoxy resin adhesive, which has improved its shear strength and peel strength, and is used in the glued joints of car doors. The SK3 series polyurethane-epoxy resin developed by the Shanghai Materials Research Institute of the Ministry of Machinery Industry has a moderate viscosity, is suitable for operation, and is stable in storage. After curing, it has excellent flexibility and elasticity, and is expected to be obtained in adhesives, coatings, and composites. Extensive applications and good results in some adhesives and coatings.