Latent epoxy resin composite suitable for insulative impregnation of conformal felt and binding rope of motor and preparation method of composite

Abstract

The invention discloses a latent epoxy resin composite suitable for insulative impregnation of a conformal felt and a binding rope of a motor and a preparation method of the composite. The latent epoxy resin composite comprises the following raw materials in parts by weight: 40-60 parts of epoxy resin, 5-15 parts of a flexibilizer, 2-6 parts of modified imidazole, 0.5-1.5 parts of a metallic compound, 0-3 parts of organic acid and 20-50 parts of a diluent. The modified imidazole is a cyanoethyl compound of imidazole and acrylonitrile. The impregnation glue prepared by the invention is high in heat resistance, the glass-transition temperature reaches over 125 DEG C, the Matin heat resistance reaches over 135 DEG C and the temperature resistant grade reaches 160 DEG C (Grade F). The impregnation glue is excellent in electrical insulating property, has the characteristics of long-term storage at constant temperature and quick curing at high temperature, and can fully satisfy the requirements on insulative impregnation of the conformal felt and the binding rope of the motor.

Description

technical field [0001] The invention relates to a latent epoxy resin composition, in particular to a latent epoxy resin composition for insulation impregnation of conformal felts and binding ropes for motors and a preparation method thereof, belonging to the technical field of polymer materials and motors. Background technique [0002] With the improvement of motor manufacturing technology, my country has been able to mass-produce motors with a power of more than 600MW on a large scale, and even 700MW water turbine motors, 1000MW ultra-zero thermal motors and 1000MW nuclear power motors. The increase of motor power is accompanied by the increase of operating temperature, and the local operating temperature may be above 80-100°C, which puts forward new requirements for the temperature resistance of the internal insulation and sealing materials of the motor, so the temperature resistance level of the insulation material is gradually changed from B-level rose to F-level, H-leve...

AI Technical Summary

Problems solved by technology

[0005]1. The operation time is short, it must be prepared and used immediately, the material loss is large, and it is difficult to meet the production process requirements;

[0006]2. It is not easy to adjust after construction;

[0007]3. Sticky hands during operation, poor operation process and low production efficiency;

[0008]4. The system has poor temperature resistance and cannot meet the long-term stable working requirements of motors with power above 300MW

[0009] In addition, Ni Miaomiao, Harbin Institute of Electrical Engineering, etc. have developed a latent epoxy resin composition system ("China Adhesive Symposium Proceedings", 1998), the operating process performance of this system has not been reported, and the storage period at room temperature meets the requirements

However, the material must be fully cured at 130°C, which cannot meet the requirements of the motor assembly process; if the material is cured at 85-95°C for 12 hours, it can only be basically cured, and the glass transition temperature can only reach 85.67°C, which cannot meet the requirements of high-power motors. temperature requirements