A kind of low viscosity unsaturated resin and preparation method thereof

Abstract

The invention discloses a low viscosity unsaturated resin. The resin comprises the following raw materials of components in parts by weight: 10 to 20 parts of dicarboxylic acid or / and dicarboxylic anhydride, 10 to 40 parts of monohydric alcohol, 10 to 20 parts of dihydric alcohol, 5 to 25 parts of polyhydric alcohol, 15 to 30 parts of maleic anhydride, 0.01 to 0.5 part of stabilizer, 0.05 to 2 parts of initiator and 5 to 20 parts of cross-linking agent. The preparation method of the resin is: mixing the dicarboxylic acid or / and the dicarboxylic anhydride, the dihydric alcohol, the polyhydric alcohol and the maleic anhydride, and then heating up to 170 to 200 DEG C; adding the monohydric alcohol and mixing evenly, then gradually heating up to 170 to 210 DEG C to process the end-capping reaction; then cooling to 160 to 180 DEG C; adding the stabilizer and mixing evenly, and cooling naturally; finally, adding the initiator and the cross-linking agent, and mixing evenly. The viscosity of the unsaturated polyester resin is low. The resin has no styrene or vinyl toluene reactive diluent, which is clean and environment friendly. The solidification process of the resin has no volatile organic compound(VOC) emission.

Description

technical field [0001] The invention relates to the field of resin materials, in particular to a low-viscosity unsaturated polyester resin which does not contain any styrene or vinyl toluene active diluent and is suitable for a VPI impregnation process and a preparation method thereof. Background technique [0002] In the manufacturing technology of motors and power generation equipment, the performance of insulating materials and the stability of long-term use are one of the core technologies of products. As the country determines the construction of a resource-saving and environment-friendly society as a strategic task in the medium and long-term planning of national economic and social development, domestic enterprises need to pay more attention to the environmental problems brought about by project construction, and should protect and protect them as soon as possible. Control and implement green energy and green construction. However, the application of insulating varni...

AI Technical Summary

Problems solved by technology

Although the silicone impregnated resin system has good heat resistance, the curing temperature is high, the time is long, and the price is expensive; the epoxy resin system has limited temperature resistance, long curing time, and is not environmentally friendly during the manufacturing period; unsaturated polyester Although the imine system has good overall performance, the resin has a high viscosity and cannot be directly used in the VPI impregnation process. It needs to be mixed with a certain amount of styrene or vinyl toluene reactive diluent, which will inevitably cause a certain degree of pollution to the environment.

Moreover, the current insulating varnish can only produce insulating varnish products with heat-resistant grades of F and H, and cannot prepare insulating varnish products with heat-resistant grades above H.