Epoxy resin composite insulating material with mechanical damage targeted self-healing performance

Abstract

The invention discloses a preparation method of an epoxy resin composite insulating material with mechanical damage targeted self-healing performance, and belongs to the field of materials. The preparation method comprises the following steps: firstly, weighing microcapsules, dispersing the microcapsules in epoxy resin to obtain a mixture, adding methylhexahydrophthalic anhydride, a diethylenetriamine curing agent and a catalyst 2, 4, 6-tri (dimethylaminomethyl) phenol into the mixture, uniformly mixing, and reacting; carrying out vacuum degassing on a product obtained after the reaction is finished, pouring the product into a stainless steel mold, driving the magnetic core microcapsule to move towards an easily damaged area by utilizing a high-density directional magnetic field, and completing migration of the microcapsule after 20-40 minutes; and after the permanent magnet is removed, curing for 1-3 hours at 80-100 DEG C, then heating to 100-110 DEG C, continuing curing for 1-3 hours, and taking out the epoxy resin composite insulating sheet. The method is based on the self-repairing performance test of the epoxy resin composite insulating material, and the targeted mechanical damage repairing function of the epoxy resin composite insulating material is proved through a field emission scanning electron microscope and an inverted multi-photon confocal microscope.

Description

technical field [0001] The invention belongs to the technical field of preparation of novel micro-nano structure self-healing materials in insulating materials, and particularly relates to an epoxy resin composite insulating material with mechanical damage-targeted self-healing properties. Background technique [0002] As an important basic insulating material, epoxy resin is widely used in power equipment, electronic device packaging, military aviation and other fields due to its low manufacturing cost, good mechanical properties, and excellent insulating properties. However, during the long-term operation, it will be subject to the combined action of electrical, thermal, mechanical and other stresses, which will inevitably cause local cracking inside, resulting in the degradation of the insulation performance of the material or even premature failure. Inspired by the natural biological self-healing ability, self-healing technology has attracted extensive attention of schol...

AI Technical Summary

Problems solved by technology

Existing microencapsulation schemes focus on physical damage repair, relying on traditional external stimuli such as high temperature, humidity, and pH, which will reduce the sensitivity of electrons and even lead to insulation corrosion

2. The negative effects brought by the existing microcapsules, such as the deterioration of the mechanical and electrical properties of the matrix, are inevitable and unacceptable in the industrial application of insulating materials

3. The discharge of harmful components in the existing microcapsules seriously threatens the health of personnel and the safe operation of electrical equipment (such as the discharged gas seriously affects the electrical performance of high-purity insulating gases in electrical equipment)

4. The existing microcapsules are widely and randomly present in the matrix, and cannot be distributed in a targeted and gradual manner like targeted drugs, resulting in low treatment efficiency, high consumption, high cost, and many side effects

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