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180-grade straight welded polyurethane wire enamel and preparation method thereof

A technology of polyurethane varnish and wire varnish, which is applied in the field of enamelled wire varnish and its preparation, can solve the problems of high raw material price, low inflection point temperature of dielectric loss curve, and low soft armor breakdown temperature, etc. Excellent effect of softening breakdown temperature and inflection point temperature of dielectric loss curve, thermal shock performance and salt water pinhole performance

Inactive Publication Date: 2015-06-24
CHANGSHU INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have found that the polyurethane wire enamel prepared according to these technical solutions still has the problems of low breakdown temperature of soft armor, low inflection point temperature of dielectric loss curve, and high price of some raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of polyester polyol resin:

[0033] 873.8 grams of dimethyl terephthalate, 248.3 grams of ethylene glycol, 180 grams of 1,4-butanediol, 104.2 grams of neopentyl glycol, 184.2 grams of glycerol, 136.2 grams of pentaerythritol, and 8.6 grams of zinc acetate were added to the reaction Stir and heat up to dissolve and react, and control the temperature at the top of the kettle to not be higher than 70°C; when the amount of methanol produced reaches 288 grams, lower the temperature of the system to 150°C.

[0034] Then add 296.2 grams of phthalic anhydride, 218.1 grams of pyromellitic anhydride, and 192.1 grams of trimellitic anhydride, heat up to continue the reaction, and control the temperature at the top of the kettle to be no higher than 100°C; when the water output reaches 108 grams, reduce the system temperature to 150 ℃, add the mixed solvent of 2135.0 gram m-p-cresol and xylene to obtain polyester polyol resin, wherein the mass ratio of m-p-cresol an...

Embodiment 2

[0046] (1) Preparation of polyester polyol resin:

[0047] 582.5 grams of dimethyl terephthalate, 372.4 grams of ethylene glycol, 360.5 grams of 1,4-butanediol, 104.2 grams of neopentyl glycol, 184.2 grams of glycerol, 136.2 grams of pentaerythritol, and 8.7 grams of zinc acetate were added to the reaction Stir and heat up to dissolve and react, and control the temperature at the top of the kettle to not be higher than 70°C; when the amount of methanol produced reaches 192 grams, lower the temperature of the system to 150°C.

[0048] Then add 444.3 grams of phthalic anhydride, 327.2 grams of pyromellitic anhydride, and 146.1 grams of adipic acid, and continue the reaction by raising the temperature, controlling the temperature at the top of the kettle to not be higher than 100°C; To 150 DEG C, add 2321.0 g of m-p-cresol and xylene as a mixed solvent to obtain a polyester polyol resin, wherein the mass ratio of m-p-cresol to xylene is 1:1.

[0049] In the above formula, the ra...

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PUM

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Abstract

The invention discloses a 180-degree straight welded polyurethane wire enamel and a preparation method thereof. The wire enamel is prepared from a polyester polyol resin, a polyurethane blocked resin, a solvent and a first catalyst; the polyester polyol resin is prepared from such synthesis raw materials as a polyol, a polyatomic acid ester, a polyanhydride and a second catalyst. The 180-degree straight welded polyurethane wire enamel has excellent heat shock resistance, cut-through resistance and soldering properties, and low dielectric loss.

Description

technical field [0001] The invention belongs to the technical field of wire enamel and its preparation, and in particular relates to a 180-grade direct-welding polyurethane wire enamel and a preparation method thereof. Background technique [0002] Enameled wire enamel is an indispensable electrical insulation coating applied to electrical equipment, and is one of the key raw materials for controlling the economic and technical indicators and operating life of electrical equipment. [0003] Polyurethane wire enamel has direct solderability that other wire enamel does not have, that is, when welding the enameled wire coated with it, it can be directly soldered without removing the paint film. The direct solderability of polyurethane wire enamel brings convenience to the automatic high-speed production of electronics and electrical appliances, and improves the efficiency of industrialization. However, the direct solderability of polyurethane wire enamel often reduces other pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C08G18/42C08G63/20C08G63/83
CPCC09D175/06C08G18/4208C08G63/20C08G63/83
Inventor 朱亚辉薛荣兴左晓兵朱达华曹忠海刘少锋
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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