Preparation method of epoxy resin composite material with electric tree resistance characteristic

Abstract

The invention discloses a preparation method of an epoxy resin composite material with an electric tree resistance characteristic. The method comprises the steps that nano-scale alumina and micro-scale alumina are compounded to serve as an inorganic filler; inorganic particles have a function of preventing electric tree growth, so that an electric tree channel is blocked by the inorganic particles, thereby enhancing the ability of epoxy resin to inhibit the electric branch growth; the cooperative use of fillers with different particle sizes can effectively reduce the generation of air gaps between filler particles and an epoxy polymer, and after coupling agent-low temperature plasma synergistic treatment is carried out on the inorganic filler, the bonding between the fillers with differentparticle sizes and an epoxy resin matrix is promoted, thereby effectively improving the bonding density between the filler and the resin matrix; during the curing of the epoxy resin composite material, intermittent ultrasonic treatment and vacuum degassing treatment reduce the generation of the air gaps in an epoxy system, thereby achieving the purpose of inhibiting the generation of a secondaryelectric tree structure.

Description

technical field [0001] The invention belongs to the technical field of high-voltage insulating materials, and in particular relates to a preparation method of an epoxy resin composite material with electric tree resistance characteristics. Background technique [0002] The aging of insulating materials is an important factor affecting the safe operation of cable lines. It mainly includes two forms of electrical aging and thermal aging, and electrical aging caused by electrical trees is a common aging form. During the manufacturing process of cable terminals, other forms of defects such as air bubbles and impurities may be introduced into the epoxy resin insulation material, resulting in local electric field concentration, partial discharge and charge injection, which in turn lead to the formation of electrical dendrite channels. Under the continuous action of the strong electric field, the electric tree branch develops rapidly, eventually leading to insulation breakdown, w...

AI Technical Summary

Problems solved by technology

During the manufacturing process of cable terminals, other forms of defects such as air bubbles and impurities may be introduced into the epoxy resin insulation material, causing local electric field concentration, causing partial discharge and charge injection, and then leading to the formation of electrical dendrite channels

Under the continuous action of the strong electric field, the electric tree branch develops rapidly, eventually leading to insulation breakdown, which seriously threatens the safe and stable operation of the cable transmission system