Impregnating resin for manufacturing nano composite major insulator for high-voltage motors

Abstract

The invention discloses an impregnating resin for manufacturing a nano composite major insulator for high-voltage motors. The impregnating resin is composed of nano powder, epoxy resin and a curing agent, wherein the weight percentage of each component is as follows: the weight percentage of the nano powder is 5-30%, the weight percentage of the epoxy resin is 40-85%, and the weight percentage of the curing agent is 2-55%. The viscosity of the impregnating resin is moderate before being cured, therefore, the impregnating resin is suitable for carrying out impregnating treatment on alkali-free glass cloth tapes, and the impregnating resin is used for manufacturing the nano composite major insulator for high-voltage motors with a voltage level of not less than 3 kV by using a VPI (vacuum pressure impregnation) process. The breakdown field strength of the nano composite major insulator for high-voltage motors, which is manufactured through the cooperation of the impregnating resin disclosed by the invention and an non-alkali glass cloth tape, is not less than 35 kV/mm, and the electrical endurance of the nano composite major insulator is not less than 1000 hours under the field strength of 10 kV/mm.

Description

technical field [0001] The invention relates to an impregnating resin used for making nanocomposite main insulation of a high-voltage motor, in particular to an impregnating resin compounded by nano inorganic matter and epoxy resin. Background technique [0002] The main insulation of existing high-voltage motors is mainly composed of three materials: mica, glass fiber and bonding resin. Among them, the mica material is high-quality natural muscovite, and its weight ratio in the main insulation is generally not less than 50%. Natural muscovite has excellent corona resistance and plays a key role in ensuring the breakdown field strength and electrical life of the main insulation. However, natural mica resources are now depleted, and it is urgent to find its substitutes. [0003] It has been confirmed that the corona resistance of polymer nanocomposites is equivalent to that of mica materials, and it is most likely to replace mica in existing materials to make a nanocomposite ...

AI Technical Summary

Problems solved by technology

[0006] The existing impregnating resins have the following deficiencies due to the lack of consideration of the above-mentioned changes in the nanocomposite main insulating composition materials and application processes: the existing impregnating resins cannot introduce nano-inorganic materials with corona resistance due to the limitation of low viscosity requirements. Although individual impregnated resins contain a small amount of nano-inorganic substances, they have not been optimized according to the technical requirements of the main insulation of high-voltage motors, and the key properties of the cured products, such as breakdown field strength and electrical aging resistance, cannot meet the technical requirements of the main insulation of high-voltage motors. requirements, cannot be used to manufacture nanocomposite primary insulation without mica