Method for increasing surface flashover voltage of epoxy resin insulating material

Abstract

The invention relates to a method for increasing the surface flashover voltage of an epoxy resin insulating material, and the method specifically comprises the following steps: S1, preparing fluorine-containing molecular fragments: adding boron trifluoride ether into water-free perfluorobutanol, adding sodium hydroxide in multiple times, dropwise adding epoxy chloropropane, and carrying out an etherification reaction; adding a solvent benzene for extraction; heating and distilling filtered liquid to obtain perfluorobutanol glycidyl ether 7F-BGE; S2, preparing an epoxy resin composite material: mixing epoxy resin, a curing agent and perfluorobutanol glycidyl ether 7F-BGE according to a ratio, and stirring to obtain a uniformly dispersed castable; carrying out vacuum degassing; curing and demolding to obtain a standard test sample; and S3, testing the surface flashover voltage. The charge transport behavior of the epoxy polymer is regulated and controlled by introducing fluorine-containing molecular fragments, the material surface charge migration rate is increased, and space charge distortion caused by local space charge accumulation is reduced, so that the surface flashover voltage of an epoxy polymer matrix is improved.

Description

technical field [0001] The invention relates to the technical field of modified resins, in particular to a method for increasing the surface flashover voltage of epoxy resin insulating materials. Background technique [0002] Flashover along the surface refers to the phenomenon of discharge along the surface of the solid insulating medium when the gas or liquid dielectric around the solid insulating medium is broken down. The voltage during the discharge is called the flashover voltage. After a flashover occurs, the voltage between the electrodes drops rapidly to zero, or close to zero. Sparks or arcs in the flashover channel cause local overheating of the insulation surface and cause carbonization, which reduces the surface insulation performance. Surface flashover is a very important factor affecting and limiting the overall insulation strength of modern high-voltage electrical equipment. At present, epoxy resin has become an indispensable material in modern high-voltage...

AI Technical Summary

Problems solved by technology

[0005] However, the charge transfer rate on the surface of the material in the above technical solution is found to be relatively slow during actual use, and the space charge distortion caused by the accumulation of local space charges is relatively large, which cannot better improve the surface flashover voltage of the epoxy polymer matrix.

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