Modifier for polyester enamelled wire insulating paint, and preparation method and application thereof

Abstract

The invention discloses a modifier for improving heat resistance and metal adhesion of common polyester enamelled wire paint and a preparation method and application thereof. The modifier is a dibasic acid-tribasic acid-dibasic alcohol condensation polymer. After dibasic acid, tribasic acid, dibasic alcohol and catalyst are esterified and condensed, cresol and xylene are added to obtain a productof which the solid content is 30-35%. After the modifier and polyester enamelled wire paint are mixed and subjected to curing reaction by an enamelling machine, the temperature index for evaluating temperature classification can be increased from 130 DEG C to higher than 155 DEG C; and after the polyester enamelled wire is subjected to stripping and twisting by more than 115 revolutions instead of 104 revolutions, the paint film still can not loose the adhesiveness. Thus, the modifier obviously enhances the heat resistance and adhesion property of the enamelled wire.

Description

technical field [0001] The invention relates to an improvement method of polyester enameled wire insulating varnish, in particular to a modification additive of polyester insulating varnish used for enameled wire, its manufacturing method and application. Background technique [0002] As the winding wire of electromagnetic coil, enameled wire is widely used in the production of motors, electrical appliances and household appliances. With the rapid development of power industry and household appliances in recent years, the amount of enameled wire and the quality requirements for enameled wire are increasing day by day. The production process of the enameled wire is to coat the enameled wire varnish on the surface of the bare copper wire. Under high temperature conditions, after drying and curing by the enamelling machine, a thin paint film is formed on the surface of the bare copper wire. This paint film must have Insulation is also required to have a certain mechanical stren...

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned ordinary polyester wire enamel also has some shortcomings, the main reason is that the heat resistance is not good enough, especially the thermal shock resistance is poor, and the adhesion to the metal is not strong enough. It is mainly used as a wire enamel with a low temperature resistance level.

In order to improve the performance of ordinary polyester wire enamel, a lot of modification research has been carried out on ordinary polyester enamel, such as imine modified polyester wire enamel, tris-(2-hydroxyethyl) isocyanurate modified poly Ester wire enamel, etc., but the above methods are all modified during the synthesis of wire enamel, which is no longer ordinary polyester wire enamel, and the cost of making paint has also increased significantly