Casting mixture for epoxy casting transformer and preparation method thereof

Abstract

The invention discloses a casting mixture for an epoxy casting transformer, which comprises the following raw materials in part by weight: 1 part of epoxy resin, 2.5 to 3.1 parts of silicon micropowder, 0.1 to 0.2 part of toughening agent, 0 to 0.02 part of color paste, 0.6 to 0.7 part of curing agent, and 0.001 to 0.003 part of accelerating agent. The preparation method for the casting mixture comprises the following steps: melting the materials; adding the silicon micropowder, the toughening agent, the color paste, the curing agent, and the accelerating agent in the melted epoxy resin in turn under the conditions of heating and stirring; and then performing vacuum defoamation. Due to the adoption of mixed glue prepared from the components of the casting mixture by the preparation method thereof, the crack ratio of a cast casting body can be reduced, and the quality of the product can be improved.

Description

technical field

[0001] The invention relates to a casting mixture for an epoxy casting transformer and a preparation method thereof, belonging to the technical field of epoxy casting. Background technique

[0002] Epoxy casting material is a high molecular polymer formed by curing and polycondensation of epoxy resin. It is less affected by ambient temperature, humidity, sunlight and oxygen, and its performance is stable. Add a curing agent to the molten epoxy resin, that is, epoxy glue, to make it cross-linked into a macromolecular cured product with a network structure at a certain temperature. The cooled cast body has good mechanical properties and electrical insulation. Therefore, It is often used on high-voltage electrical appliances to support and insulate.

[0003] The current epoxy casting process includes mold loading, mixture preparation, pouring and curing. The preparation method is to mix epoxy resin and filler, heat and stir, then mix curing agent and other auxi...