High-strength, solvent-free and environment-friendly impregnating varnish and preparation method thereof

Abstract

The invention discloses high-strength, solvent-free and environment-friendly impregnating varnish and a preparation method thereof. The impregnating resin sequentially comprises following components in parts by weight: 20-25 parts of epoxy resin, 20-25 parts of liquid anhydride, 30 parts of a low-viscosity epoxy reactive diluent, 5 parts of a curing agent, 1-3 parts of an accelerant, 1.5-3 parts of an initiating agent and 2-3 parts of a defoaming agent. The impregnating resin is mainly prepared through prepolymerization and curing, can be cured rapidly under low-temperature baking and has the advantages that the curing temperature is low, the curing speed is high, the energy is saved, the environment is protected, the efficiency is improved, little cured substance volatilization is caused and the like.

Description

technical field [0001] The invention belongs to the technical field of electrical insulating material manufacturing, and relates to a high-temperature-resistant impregnating resin for insulating and impregnating windings of F / H large and medium-sized high-voltage motors, wind power generators and other refrigerant-resistant motors and electrical appliances and a preparation method thereof. Background technique [0002] With the continuous development of the electrical industry, energy saving, environmental protection and improving efficiency have become the focus of research by motor companies. For large medium and high voltage motors, the baking and curing of the stator is a time-consuming and energy-intensive process. In recent years, in order to save energy and improve production efficiency, many companies have conducted research on the curing process of dipping varnish. [0003] The existing epoxy-acid anhydride system has excellent impregnation properties, but the syste...

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Problems solved by technology

[0003] The existing epoxy-acid anhydride system has excellent impregnation properties, but the system also has the problem of moisture absorption. Although the storage is quite stable, due to moisture absorption, the anhydride is hydrolyzed and hydrolyzed into a dibasic acid, which accelerates the process with The amount of reaction between epoxy accelerates the growth of viscosity, which also leads to the instability of acid anhydride. Therefore, although many studies have been carried out on impregnated resins in the prior art, a more superior one has not been proposed yet. The technical solution can solve the above problems; at the same time, in the prior art, the shrinkage rate of unsaturated polyester is large, the glass transition temperature is low, and the epoxy resin is hard and brittle.

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