Preparation method of medium-high temperature self-repairing insulating material

Abstract

The invention belongs to the technical field of electrical materials, and particularly relates to a preparation method of a medium-high temperature self-repairing insulating material. At present, mostof extrinsic self-repairing systems are double-component microcapsule systems, the systems are complex in structure, it is difficult to ensure that a repairing agent can make contact with a catalystand complete self-repairing before failure when a micro-discharge defect occurs, and common single-component system repairing liquid contains unsaturated double bonds and is prone to failure in advance at the medium-high temperature. The preparation method comprises the steps: firstly, synthesizing an imidazole-added epoxy resin matrix with anion catalytic capability, and introducing microcapsulescoated with stable repair liquid into the matrix to endow the insulating material with the capability of repairing micro-discharge defects. When electric branches caused by micro-discharge defects are developed into microcapsules, the microcapsules can be broken, electric branch channels are filled with the repairing liquid, and then the repairing liquid is cured under the catalysis of oxygen anion groups in the channel walls under the medium-high temperature condition, so that the defects of the electric branches are repaired, and meanwhile, the electrical performance is completely recovered.

Description

technical field [0001] The application belongs to the technical field of electrical materials, and in particular relates to a preparation method of a medium-high temperature self-repairing insulating material. Background technique [0002] Polyethylene, silicone rubber, epoxy resin and other organic substances and their composite materials are widely used in electrical insulation. During use, with long-term aging, micro-discharge defects represented by electric trees and water trees will inevitably occur inside them. , the further development of these micro-defects will lead to material insulation damage, causing insulation failure and equipment failure. Therefore, if the polymer material can be made to have the function of self-healing, and the defect can be repaired at the early stage of defect development, the above problems can be solved, the service life of the insulating medium can be significantly extended, and the safety of the product can be improved. For micro-dis...

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Problems solved by technology

[0004] However, most of the current extrinsic self-healing systems are two-component microcapsule systems. The structure of the system is complex, and the repair agent and the catalyst need to be stored and dispersed in the polymer separately. It is difficult to ensure the repair when micro-discharge defects occur. The agent can contact the catalyst and complete self-healing before failure

However, the existing single-component microcapsule system (such as the ultraviolet light trigger system) used in the repair fluid mostly contains unsaturated double bonds, which is prone to premature failure at medium and high temperatures, so it cannot be applied to medium and high temperature conditions.

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