High heat-stage non-pinhole polyesterimide enamelled wire insulating paint modifier

Abstract

The invention relates the modifier, which is used to make and modify high-heat polyurethane paint wire insulating paint. The modifier comprises 20-30% phenolic resin, 10-20% amido resin, 10-20% acrylic resin, 2-5% organosilicon surface active agent, and 30-60% M-and P-cresols. The method comprises the following steps: putting the phenolic resin, amidogen resin, acrylic resin and organosilicon surface active agent into M-and P-cresols, then mixing, dissolving, heating to 40-60Deg.C, stirring, and getting the mixture. The modifier is used to make high-heat polyurethane paint wire insulating paint. The method improves the continuity and pinhole property of polyurethane paint wire insulating paint, without reducing heat-proof grade of paint. The properties of the paint modified by the modifier meet international electrician IEC standard.

Description

technical field [0001] The invention relates to a modifying agent for polyesterimide varnish, which is used for manufacturing high-heat level non-pinhole polyesterimide enameled wire insulating varnish and its modification. Background technique [0002] High heat-grade pinhole-free polyesterimide enameled wire insulating varnish is a high-temperature resistant enameled wire varnish prepared by imine modification on the basis of polyester varnish. During production, the heat resistance of enameled wire can be improved correspondingly by controlling the number of imine groups. The index reaches H level and C level, but due to the rigidity of the imine group, the elasticity and softness of the polyester imide paint film are lower than that of the polyester paint film, which directly manifests as the pinhole performance of the paint film When the motor is running, under the action of the voltage, it is very easy to produce a short circuit at the pinhole and be broken down, which...

AI Technical Summary

Problems solved by technology

[0002] High heat-grade pinhole-free polyesterimide enameled wire insulating varnish is a high-temperature resistant enameled wire varnish prepared by imine modification on the basis of polyester varnish. During production, the heat resistance of enameled wire can be improved correspondingly by controlling the number of imine groups. The index reaches H level and C level, but due to the rigidity of the imine group, the elasticity and softness of the polyester imide paint film are lower than that of the polyester paint film, which directly manifests as the pinhole performance of the paint film When the motor is running, under the action of the voltage, it is very easy to produce a short circuit at the pinhole and be broken down, which affects the service life and safety performance of the motor and electrical appliances. Therefore, domestic enameled wire manufacturers currently require the continuity of the enameled wire paint film It is getting higher and higher, and most of them are not satisfied with the technical level of the 30m line length not exceeding 5 pinholes required by GB / T6109.11-90. Usually, no pinholes are required, and some even require 15% stretching without needles Holes, in order to meet the needs of customers, this invention has modified the high-heat grade polyesterimide paint without pinholes, and achieved satisfactory results