Developing a novel environment friendly epoxy solventless impregnating resin without anhydride for high voltage motor

In this article, a novel environmentally friendly anhydride free, solventless free epoxy impregnating resin was developed by synthesizing a novel epoxy resin with high reactivity and heat resistance, then combining with environment friendly epoxy cross-linking monomers and effective initiator-inhibitor. The new resin has excellent processing abilities and moisture resistance, suitable for VPI processing. The comprehensive performance of the new resin was investigated systematically, including curing reaction, volatile material content, storage stability, glass transition temperature, heat resistance, electric insulation performance of simulated coils and compared with similar properties using a conventional epoxy anhydride VPI resin. The results indicate that the new resin has many excellent characteristics, such as fast curing at 150°C, very low volatile material content (<;3%), heat resistance; greater than Class H, excellent storage stability: without the need for drying and cooling, i.e. the viscosity increase was lower than 0.3 times when stored for 96h at 60°C. More important are the results from the simulated coils impregnated with the developed resin. They have low dielectric loss, dielectric loss increment and high breakdown voltage strength; equal to that of epoxy an anhydride VPI resin. The new resin can be used in any high voltage rotating motors. It is an excellent substitute for common unsaturated polyester and epoxy impregnating resins, and complies with the global environmental policy. Finally, the new resin offers a significant improvement on high voltage VPI resin products and environmental of insulation impregnating for motors and electrical equipment industry.