A kind of heat-resistant self-adhesive paint and preparation method thereof

Abstract

The invention discloses epoxy type enameled wire heat-resistant self-adhesive paint for transformer winding wire splicing. The heat-resistant self-adhesive paint is prepared from the following components: 30-40 parts by weight of bisphenol A epoxy resin, 5-12 parts by weight of novolac epoxy resin, 2-6 parts by weight of organic silicon resin, 2-6 parts by weight of a medium-temperature latent curing agent with model of 596, 0.2-0.4 part by weight of a coloring agent, 25-38 parts by weight of dimethylbenzene and 8-12 parts by weight of n-butyl alcohol. The preparation method of the heat-resistant self-adhesive paint comprises the following steps: dissolving for the first time, melting, mixing, filtering and curing, thereby obtaining the heat-resistant self-adhesive paint. The glass transition temperature of the heat-resistant self-adhesive enameled wire coated by the heat-resistant self-adhesive paint is up to 100-120 DEG C, and the binding performance of the guide wire and the mechanical strength of the winding can be still kept under an environmental condition of 120 DEG C. The preparation process has the advantages of simple steps, simple and convenient operation, and the like.

Description

technical field [0001] The invention discloses a heat-resistant self-adhesive varnish for epoxy-type enameled wires for bonding transformer winding wires, and also discloses a preparation method for heat-resistant self-adhesive varnish for epoxy-type enameled wires for bonding transformer winding wires. Background technique [0002] The mechanical strength of power transformer windings is crucial to improving the short-circuit impact resistance of transformer products, and an important method to improve the mechanical strength of windings is to use self-adhesive paint to tightly bond the single-wire windings together to form a rigid whole. At present, when the transposition wire coated with ordinary self-adhesive paint works for a long time above 100°C, the self-adhesive paint used as the adhesive between the strands of the transposition wire will soften, resulting in a decrease in the mechanical strength of the winding; when the long-term operation is above 120°C, The self-...

AI Technical Summary

Problems solved by technology

At present, when the transposition wire coated with ordinary self-adhesive paint works for a long time above 100°C, the self-adhesive paint used as the adhesive between the strands of the transposition wire will soften, resulting in a decrease in the mechanical strength of the winding; when the long-term operation is above 120°C, The self-adhesive varnish softens completely and the mechanical strength of the winding is almost equal to that of non-self-adhesive transposed wires