Preparation method of electrical insulating layer material for photoinduced self-repair of micro-discharge defects

An electrical insulation and self-repairing technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of retention, high reactivity, and degradation of overall material performance, and achieve the effect of ensuring insulation strength

Active Publication Date: 2017-01-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology still has some problems: (a) in the matrix, the ratio of epoxy resin and curing agent is too equivalent, and the excess of curing agent will lead to the decline of the overall performance of the material; (b) the active functional groups in the matrix It has high reactivity, which is not conducive to the maintenance of the long-term insulation performance of the matrix material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of the electrical insulating layer material of micro-discharge defect photoinduced self-repairing proposed by the present invention comprises the following steps:

[0015] (1) uniformly mix the photosensitive resin, photosensitive resin reactive diluent and photoinitiator to obtain a mixture, the mass percentage of the photosensitive resin in the mixture is 55% to 85%, and the photosensitive resin reactive diluent in the mixture The mass percentage is 10%-40%, and the mass percentage of the photoinitiator in the mixture is 3%-5%; the surface-modified nano-titanium dioxide is dispersed in deionized water by an ultrasonic processor to obtain the first solution, The mass percent concentration of the nano-titanium dioxide is 0.5% to 2%; polyvinyl alcohol is added to the above-mentioned first solution to obtain a second solution, and the mass percent concentration of the polyvinyl alcohol is 0.05% to 0.1%; to the above-mentioned Add the above mixture i...

Embodiment 1

[0026] (1) Photosensitive resin bisphenol A epoxy acrylate, photosensitive resin reactive diluent trimethylolpropane triacrylate (TMPTA) and photoinitiator 184 are uniformly mixed to obtain a mixture, and the mass percentage of the photosensitive resin in the mixture 55%, the mass percentage of the photosensitive resin reactive diluent in the mixture is 40%, and the mass percentage of the photoinitiator in the mixture is 5%; the surface-modified nano-titanium dioxide is dispersed by an ultrasonic processor In deionized water, obtain the first solution, the mass percentage concentration of described nano titanium dioxide is 0.5%; Add polyvinyl alcohol to above-mentioned first solution, obtain the second solution, the mass percentage concentration of described polyvinyl alcohol is 0.1% %; Add the above-mentioned mixture to the above-mentioned second solution, stir and emulsify with a rotating speed of 1000r / min, the stirring time is 20min, and form a uniformly dispersed oil-in-wa...

Embodiment 2

[0030] (1) Photosensitive resin novolac epoxy acrylate, photosensitive resin reactive diluent-1,6-hexanediol diacrylate (HDDA) and photoinitiator 1173 are uniformly mixed to obtain a mixture, and the quality of the photosensitive resin in the mixture is The percentage is 85%, the mass percentage of the photosensitive resin reactive diluent in the mixture is 10%, and the mass percentage of the photoinitiator in the mixture is 5%; Dispersed in deionized water to obtain the first solution, the mass percent concentration of the nano-titanium dioxide is 2%; polyvinyl alcohol is added to the above-mentioned first solution to obtain the second solution, the mass percent concentration of the polyvinyl alcohol is 0.05%; add the above-mentioned mixture to the above-mentioned second solution, stir and emulsify at a speed of 2500r / min, and the stirring time is 20min to 40min to form a uniformly dispersed oil-in-water core material emulsion, and the amount of the mixture added is the second...

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Abstract

The invention relates to a preparation method for an electric insulating layer material with the photoinduced self-repair function for microdischarge defects, and belongs to the technical field of electrical equipment. The electric insulating layer material is a composite material, and based on thermosetting epoxy resin and a microcapsule containing a photosensitive resin repairing agent; the microdischarge defects can be cured and repaired by the repairing agent under ultraviolet light, so that the condition that the insulation strength of the material is not obviously reduced is ensured. The electric insulating layer material prepared by the method disclosed by the invention has the characteristics of being simple to prepare, high in repairing efficiency and capable of keeping the effect for a long time, can be widely applied to the electric insulating layers of power transmission and distribution cables or accessories and electronic devices, and can effectively prolong the service life and the stability in use of the electric insulating material.

Description

technical field [0001] The invention relates to a preparation method of an electrical insulating layer material for photoinduced self-repair of micro-discharge defects, and belongs to the technical field of electrical equipment. 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 impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K9/10C08K3/22B01J13/14
Inventor 何金良胡军高雷余占清曾嵘
Owner TSINGHUA UNIV
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