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

A manufacturing method and technology of insulating paint, applied in polyester coatings, coatings, etc., can solve the problems of low temperature resistance, increased paint cost, poor thermal shock resistance, etc., and achieve low cost, improved heat resistance and viscosity. The effect of connection performance

Inactive Publication Date: 2011-08-17
TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Reactor: a stainless steel stirred reactor with a jacket and an inner coil that can pass through a heating or cooling medium, and is equipped with a vertical fractionator, a horizontal condenser, and a distillate receiving tank. Below the reaction kettle, a dilution kettle is set, and the basic structure of the dilution kettle is a stainless steel stirring reaction kettle with a cooling water jacket.

[0020] Raw materials are charged in molar ratio: the ratio of dibasic acid, tribasic acid and dibasic alcohol is 1:0.05:0.99.

[0021] Weigh 83kg of terephthalic acid, 4.8kg of trimellitic anhydride, 30.8kg of ethylene glycol, and 12g of catalyst zinc acetate into the above-mentioned 300-liter reactor, start the stirrer, heat up to 160°C, fill with nitrogen, and pressurize Under the condition of 0.3MPa (gauge pressure), raise the temperature to 240°C at a constant speed for about four hours, remove the pressure, make the system heat up at a rate of 8-12°C per hour under n...

Embodiment 2

[0024] The reactor was the same as in Example 1.

[0025] Raw materials are charged in molar ratio: the ratio of dibasic acid, tribasic acid and dibasic alcohol is 1:0.2:1.05.

[0026] Weigh 66.4kg of isophthalic acid, 15.4kg of trimellitic anhydride, 44.6kg of diethylene glycol, and 101g of catalyst tetraisopropyl titanate into a 300-liter reactor, start the stirrer, and heat up to 160°C , filled with nitrogen, under normal pressure, after about four hours, the temperature was raised to 240°C at a constant speed, and the system was continued to be heated at a rate of 8-12°C per hour under normal pressure, and the temperature was raised to 265°C, kept warm and sampled to determine the acidity. value, when the acid value drops to 60mg / g, start to cool down, when the temperature drops to 160°C, add 75.8kg of tri-mixed cresols, keep stirring, for about 40 minutes, the temperature drops to 135°C, open the bottom valve of the reaction kettle, and The material was put into a 500-li...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D5/25C09D7/12C08G63/20C08G63/672
Inventor 谢飞黄宗祥
Owner TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD
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