Surface treatment method of insert in vacuum casting and APG processes

Abstract

The invention relates to a surface treatment method of an insert in vacuum casting and APG processes, which is realized by the following steps: preparing adhesive: mixing 100 parts of epoxy resin, 50 parts of phenolic resin, 175-200 parts of toluene and 175-200 parts of butanone, and stirring the mixture for 2-2.5 hours at the normal temperature; adding 1.5 parts of 2-ethyl-4-methylimidazole and stirring for 0.4-0.6 hour at the normal temperature; adding 8-10 parts of QS toughening agent and stirring for 0.4-0.6 hour; standing for 12-24 hours; cleaning the insert; airing; sealing insert: sealing the non-adhesive part with a transparent adhesive tape according to the pattern requirement, and tearing the transparent adhesive tape after the adhesive is solidified; gluing for 2-4 times at the normal temperature, wherein after the glue coated in the previous gluing process is aired, the next gluing process is carried out; preheating the glued insert, wherein the preheating temperature is 135-145 DEG C, and the preheating time is 1-1.5 hours; and taking out the insert and reserving the insert by covering for later user. The invention has the beneficial effect that because a buffer layer is additionally arranged between the insert and an epoxy material, the invention prevents gaps from occurring between the insert and the epoxy material because of larger difference of thermal expansion coefficients.

Description

technical field [0001] The invention relates to a vacuum pouring process and an APG process, in particular to a surface treatment method for an insert in the above process. Background technique [0002] Vacuum casting process refers to the process of mixing thermosetting resin, filler, curing agent, etc. in a vacuum state, injecting into the mold by gravity, and thermosetting molding. [0003] The APG process refers to the automatic pressure gelation process (automatic pressure gelation process), which mixes thermosetting resin, filler, curing agent, etc. under vacuum, and then uses pressure to inject the processed material into the mold for thermosetting molding. [0004] The insulators of medium and high voltage electrical equipment are generally embedded with inserts. These inserts are made of copper or aluminum and are used as electrodes or connectors in the insulation. If the surface of the inserts is poorly treated, the metal parts and Epoxy materials have different t...

AI Technical Summary

Problems solved by technology

[0004] The insulators of medium and high voltage electrical equipment are generally embedded with inserts. These inserts are made of copper or aluminum and are used as electrodes or connectors in the insulation. If the surface of the inserts is poorly treated, the metal parts and Epoxy materials have different thermal expansion coefficients and inconsistent shrinkage rates during curing, which can lead to gaps around the inserts inside the insulation, resulting in defects such as poor electrical performance or air leakage of the insulation