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Preparation method of organic silicon modified polyester wire enamel

A technology of wire enamelling and modified polyester, which is applied in the direction of polyester coatings and coatings, can solve the problems of insufficient heat resistance of polyester wire enamelling and no discovery, and achieve good storage stability, reduce toxicity, and improve The effect that the heat resistance is not good enough

Inactive Publication Date: 2011-08-24
GUANGDONG HENGBAOCHANG ELECTRICAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of polyester wire enamel is that the heat resistance is not good enough, and it is mainly used in the production of ordinary heat-resistant grades (such as Class B 130°C) enameled wires
Silicone-modified polyester insulating varnish has been reported in literature or patents as dipping varnish, covering varnish, and silicon steel sheet varnish, but it has not been found in relevant literature reports as a phenol-free enameled wire varnish.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Synthesis of Polyester with Lower Degree of Polymerization

[0032] Put 106 grams of diethylene glycol, 78 grams of propylene glycol, 9 grams of glycerol, 316 grams of isophthalic acid, and 0.25 grams of zinc acetate into a 1000 ml four-necked flask, insert an electric stirrer, a thermometer, and introduce an inert gas tube, vertical fractionator, horizontal condenser (shared with one port), and the flask is placed in an electric heating pot that can control the temperature.

[0033] Inject nitrogen gas into the inert gas inlet pipe, under normal pressure conditions, control the temperature for about 1 hour and heat to 140°C, start stirring, control the temperature for about 0.5 hours and heat to 160°C, the vertical fractionator appears reflux liquid, at about 160°C Keep the temperature for 1 hour, then increase the temperature at a rate of about 16°C per hour until it reaches 240°C, it takes about 5 hours, keep warm at 240°C, take a sample to measure the acid v...

Embodiment 2

[0042] The first step, synthesis of low polymerization degree polyester

[0043] Raw material dosage: 106 grams of diethylene glycol, 104 grams of neopentyl glycol, 27 grams of trimethylolpropane, 116.3 grams of isophthalic acid, and 87 grams of phthalic anhydride.

[0044] Carry out reaction according to the first step operation of embodiment 1, collect the condensed water that horizontal condenser comes out, when dehydration amount reaches 27 grams, think that reaction end point, stop reaction, cool discharge, standby.

[0045] The second step: Synthesis of silicone resin prepolymer solution

[0046] Put 296 grams of dimethyldiethoxysilane, 288 grams of phenyltriethoxysilane, and 580 grams of xylene into a 2000 ml flask, add 1 ml of hydrochloric acid solution into 110 ml of water, and place in the dropping funnel , all the other operating steps are with the second step of embodiment 1.

[0047] Step 3: Reaction of silicone resin prepolymer solution with low polymerization ...

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PUM

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Abstract

The invention discloses a preparation method of organic silicon modified polyester wire enamel. Divalent alcohol, trihydric alcohol and dibasic acid are combined into polyester of low polymerization in a molar ratio of 1: (0.08-0.2): (0.95-1); dialkyl dichlorosilane or dialkyl dioxolane silane and alkyl trichlorosilane or alkyl trialkoxysilane are combined into organic silicon resin prepolymer solution; then the organic silicon resin prepolymer solution reacts with resin of low polymerization; and a solvent and a film forming assistant are added to blend into the organic silicon modified polyester wire enamel. The heat-resistant degree of the polyester wire enamel is effectively improved, and production process is simple and reliable; the organic silicon modified polyester wire enamel can be produced at normal pressure and common vacuum degree, and the storage stability of the product is good; and the solvent with small toxicity is used for replacing phenol solvents so as to lower product toxicity.

Description

technical field [0001] The invention relates to a preparation method of polyester wire enamel, in particular to a preparation method of polyester wire enamel modified by organosilicon resin. Background technique [0002] The polyester wire enamel used in the production of enameled wires is a polyester resin formed by esterification and polycondensation of dibasic alcohols (ethylene glycol, etc.) and dibasic acids (terephthalic acid, etc.). Because polyester wire enamel has the advantages of wide paint-making process, good storage stability, good wire coating process, balanced mechanical properties, electrical properties, heat resistance, and especially low price, the long-term It occupies a dominant position in the production of electromagnetic wires at home and abroad, and is the most widely used paint type. [0003] The disadvantage of polyester wire enamel is that the heat resistance is not good enough, and it is mainly used in the production of ordinary heat-resistant g...

Claims

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Application Information

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IPC IPC(8): C09D167/02C09D183/04C09D5/25C08G63/672C08G77/06C08J3/24
Inventor 谢飞高伟国黄宗祥吴春芝
Owner GUANGDONG HENGBAOCHANG ELECTRICAL TECH
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