Pure resin type polyester epoxy environment-friendly impregnating resin and preparation method thereof

Abstract

The invention relates to a pure resin type polyester epoxy environment-friendly impregnating resin, which is mainly prepared, by mass, from the following raw materials: 40.0-80.0 parts of low-viscosity polyester acrylate resin, 10.0-40.0 parts of modified epoxy resin, 1.0-4.0 parts of an epoxy curing agent, 0.5-1.0 part of a free radical initiator and 0.02-0.2 part of a polymerization inhibitor. The preparation method comprises the following steps: uniformly mixing the low-viscosity polyester acrylate resin, the modified epoxy resin, the epoxy curing agent, the polymerization inhibitor and thefree radical initiator according to the proportion, then uniformly dispersing under the action of high shear with a linear speed of 10m / s-15m / s, filtering so as to obtain the pure resin type polyester epoxy environment-friendly impregnating resin. The impregnating resin does not contain a diluent, and the viscosity of the whole resin is directly controlled by adopting the low-viscosity polyesteracrylate resin, so that the obtained impregnating resin is cured, the volatile component is close to zero, and the requirement of environment-friendly impregnating resin in a real sense is met.

Description

technical field [0001] The invention belongs to the field of insulating materials, in particular to a pure resin type polyester epoxy environment-friendly impregnating resin. Background technique [0002] Impregnating resin is used for insulation impregnation treatment of coil windings of electrical appliances such as motors and transformers, and plays the role of electrical insulation, bonding molding and moisture resistance. The application of impregnating resin has greatly promoted the rapid development of VPI process in my country's large and medium-sized motor industry, and has made an indelible contribution to the improvement of my country's large and medium-sized motor insulation manufacturing process. However, the current impregnation resins all contain reactive diluents, which volatilize in the atmosphere and become pungent odors, which affect the environment and endanger human health, and do not meet the requirements of environmental protection. Therefore, reducin...

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Problems solved by technology

[0003] Chinese patents CN201610977800.8 and CN201610266677.9 respectively report two kinds of environment-friendly polyester epoxy system impregnating resins. The resin system is mainly based on heat-resistant unsaturated polyester, epoxy resin and environment-friendly active diluent to develop formula design. The resulting resin system has excellent overall performance, but the environmentally friendly reactive diluents used for impregnating resins in such systems are generally high-boiling acrylate and aliphatic glycidyl ether diluents. Although such high-boiling and low-volatility diluents have low volatility Low odor and other environmental protection advantages, but it will still produce solidified volatile matter emissions of about 1.0% to 5.0% of the overall resin content during high-temperature baking, which is difficult to meet the requirements of green environmental protection in the true sense. Type polyester epoxy impregnating resin has very important significance for this technical field

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