Preparation method of 180 grade polyurethane enamelled wire insulating paint used for ultra-fine wire

A technology of polyurethane paint and insulating paint, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor resistance to salt water pinholes and poor leveling of paint liquid, and achieve good resistance to saltwater pinholes, Good direct weldability and smooth surface

Inactive Publication Date: 2013-02-20
上海晟然绝缘材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this solution improves the heat resistance, due to the rigid structure of the imine five-membered ring, the salt water pinhole resistance of the enameled wire is deteriorated, and the leveling of the paint solution is not as good as the conventional 130-grade and 155-grade polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Synthesize polyester resin according to the method of the present invention, for synthesizing the polyester resin of imine five-membered ring modification, make through the following steps: first drop into ethylene glycol, glycerol and the acetic acid that accounts for total charging amount 0.01% in reaction kettle Zinc, stir to raise the temperature of the kettle to 60°C, put in TMP and DMT, gradually raise the temperature to 225°C, collect fractions, cool down to 165°C when there are no fractions, put in trimellitic anhydride and 4,4'-diaminodiphenylmethane, and heat up to 200°C , when there is no distillate, cool down to 70°C, add m-cresol and xylene to dilute the polyester resin with a solid content of 44%, cool down to 50°C for later use. The molar ratio of imine five-membered ring to DMT is 1:1.2.

[0020] Synthesize blocked isocyanate according to the method of the present invention, according to the following steps: first drop into described polyester resin, tri...

Embodiment 2

[0023] Synthesize modified polyester resin according to the method in Example 1, wherein the molar ratio of imine five-membered ring to DMT is 1:1.2; synthesize blocked isocyanate according to the method in Example 1; let down the paint according to the method in Example 1, and control the amino condensate The addition ratio of the silicone oil is 0.35 parts, the silicone oil ratio is 0.04 parts, and the acrylate is 0.6 parts. 180-grade polyurethane enameled wire insulating varnish is used to generate ultra-fine wires, with a solid content of 22%, a viscosity of 15-17 seconds at 30°C, and apply 4 cups.

Embodiment 3

[0025] Synthesize polyester resin according to the method of Example 1, wherein the molar ratio of imine five-membered ring to DMT is 1:1.1; synthesize blocked isocyanate according to the method of Example 1; let down the paint according to the method of the present invention, and control the addition ratio of amino condensate 0.75 parts, silicone oil ratio is 0.03 parts, acrylate is 0.6 parts. 180-grade polyurethane enameled wire insulating varnish is used to generate ultra-fine wires, with a solid content of 22%, a viscosity of 15-17 seconds at 30°C, and apply 4 cups.

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PUM

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Abstract

The invention relates to 180 grade polyurethane enamelled wire insulating paint used for an ultra-fine wire. The insulating paint is prepared by the following components of 14-20 parts of an imide-modified polyester resin, 36-50 parts of a blocked isocyanate resin, 0.02 part of zinc acetate, 0.35-0.75 part of an amino condensation compound, 0.02-0.05 part of silicone oil, 0.2-0.6 part of acrylic ester, 17-27 parts of dimethylbenzene, 7-17 parts of phenol and 5 parts of n-butyl alcohol. High heat grade non-pinhole rapid direct-welding polyurethane enamelled wire insulating paint is produced by mixing paint with the above materials at a temperature of 60-70 DEG C. Compared with a conventional insulating paint, the enamelled wire insulating paint provided by the invention has good leveling property, and can meet the requirements of a production process with specification of 0.02 mm and production speed of 1500 m/min. The prepared enamelled wire has smooth and bright surfaces and has no shining points. The prepared enamelled wire has high a soft breakdown temperature which is higher than 260 DEG C. The prepared enamelled wire has good salt-water pinhole resistant performance and is resistant to knead and stretch salt-water pinholes in salt water. The prepared enamelled wire has good directly welding performance and is capable of being directly welded at a temperature of 375 DEG C. The prepared enamelled wire has wide process redundancy and is convenient for realizing stable process production.

Description

technical field [0001] The invention relates to a preparation method of 180-grade polyurethane enameled wire insulating varnish for ultrafine wires. Background technique [0002] Since the urethane group in the paint film structure of polyurethane enameled wire can decompose at high temperature, the enameled wire can be directly welded without removing the paint film in advance, which greatly simplifies the production process, and the polyurethane enameled wire has high-frequency It has the characteristics of low dielectric loss, so it has been widely used in various electronic components. [0003] Polyurethane enameled wire insulating varnishes are mainly grades 130 and 155, and their softening breakdown temperatures are 170°C and 200°C, while the softening breakdown temperatures of polyester and modified polyester of the same thermal grade are 240°C and 270°C. The two are very different. In addition, the thermal shock performance is not as good as that of polyester or mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/12C09D5/25
Inventor 邵武军涂张应
Owner 上海晟然绝缘材料有限公司
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