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Polyimide paint for low-viscosity enamelled wires, and preparation method and application of polyimide paint

A polyimide varnish and enameled wire technology, which is applied in coatings, electrical components, circuits, etc., can solve the problems of enameled wire production difficulties, low yield of enameled wires, and low solid content of lacquer liquid, so as to reduce coating difficulty and surface Low apparent viscosity and excellent mechanical properties

Inactive Publication Date: 2017-08-11
NANJING ZHONGHONG RUNNING ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, when the solid content of the polyimide wire enamel obtained by synthesis (ie polyamic acid solution) is between 12% and 20%, the apparent viscosity of the obtained polyamic acid solution is usually above 1000cp, and the prepared paint film is only It will have better mechanical properties to meet the needs of enameled wire production; but the high viscosity of the solution often brings difficulties to enameled wire production, making it difficult to coat the wire, and the final yield of enameled wire is low
Although as reported in CN104073155A, the viscosity of the paint solution can be reduced by adding solvent, the solid content of the paint solution will become lower, so that the paint film is thinner after each line coating, and multiple coatings are required. There are many problems in the appearance, quality and production efficiency of the obtained enameled wire

Method used

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  • Polyimide paint for low-viscosity enamelled wires, and preparation method and application of polyimide paint
  • Polyimide paint for low-viscosity enamelled wires, and preparation method and application of polyimide paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a reactor equipped with a thermometer and mechanical stirring, under the condition of a constant temperature water bath at 20°C, dissolve 0.269mol of 4,4'-diaminodiphenyl ether in N,N-dimethylacetamide, and keep the temperature of the water bath at 20°C, followed by adding 0.00266mol of 5,10,15,20-tetrakis(4-aminobenzene)-21H,23H-porphyrin, stirring for 2 hours, and then adding 0.322mol of 3,3',4 , 4'-tetracarboxylic biphenyl dianhydride, react for 0.5 hours to obtain polyimide paint for low-viscosity enameled wire. Stir continuously during the whole process, and the solid content of the final solution is controlled at 15%.

Embodiment 2

[0039] In a reactor equipped with a thermometer and mechanical stirring, 0.1248mol of 4,4'-diaminodiphenyl ether and 0.0448mol of p-phenylenediamine were dissolved in N,N-dimethyl In formamide, keep the water bath temperature at 20°C, then add 0.0762mol of 5,10,15,20-tetrakis(4-aminobenzene)-21H,23H-porphyrin, stir for 2 hours, then add 0.161 mol of 3,3',4,4'-tetracarboxylic biphenyl dianhydride and 0.161 mol of 3,3',4,4'-tetracarboxylic benzophenone dianhydride, react for 1.5 hours to obtain low viscosity enameled wire Polyimide paint. Stir continuously during the whole process, and the solid content of the final solution is controlled at 15%.

Embodiment 3

[0041] In a reactor equipped with a thermometer and mechanical stirring, 0.138 mol of 4,4'-diaminodiphenyl ether and 0.100 mol of 2,2-bis[4-(3-aminobenzene Dissolve oxy)phenyl]propane in N-methylpyrrolidone, keep the temperature of the water bath at 20°C, then add 0.0042mol of 5,10,15,20-tetrakis(4-aminobenzene)-21H,23H-porphyrin morphine, stirred for 2 hours, then added 0.161mol of 3,3',4,4'-tetracarboxylic biphenyl dianhydride and 0.161mol of 3,3',4,4'-tetracarboxylic diphenyl ether diphenyl ether in 7 times anhydride, and react for 1 hour to obtain polyimide varnish for low-viscosity enameled wire. Stir continuously during the whole process, and the solid content of the final solution is controlled at 15%.

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Abstract

The invention provides polyimide paint for low-viscosity enamelled wires. The polyimide paint for the low-viscosity enamelled wires is obtained through polymerization of 5, 10, 15, 20-4(4- aminobenzene)-21H, 23H-porphyrin, diamine monomers and dianhydride monomers. The invention further provides a preparation method and application of the polyimide paint. The preparation method is simple; when the solid content of obtained paint liquid reaches 15%, the paint liquid has low apparent viscosity and high storage stability, paint films have high tensile strength and high temperature resistance, the breakdown voltage and the cut-through temperature exceed national standards of 240-level aromatic polyimide enamelled wires, and production requirements of high-temperature-resistant polyimide enamelled wires can be met.

Description

technical field [0001] The application belongs to the technical field of insulating varnish for enameled wire, and more specifically relates to a low-viscosity polyimide varnish for enameled wire and its preparation method and application. Background technique [0002] Enameled wire varnish is an insulating material commonly used in electrical appliances. It is coated on the outside of bare wires during use. After curing, it is wound into a coil, and each turn of wire is then dipped in bonding resin to form an enameled wire. The temperature resistance of enameled wire enamel is directly related to the technical indicators and operating life of electrical equipment. Especially in recent years, motors and electrical appliances have developed towards the direction of small size and high power, which makes the coil generate more heat during movement, so the requirements for the temperature resistance of insulating materials are getting higher and higher; at the same time, the pr...

Claims

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Application Information

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IPC IPC(8): C09D179/08C09D5/25C08G73/10
CPCC08G73/1003C09D179/08H01B3/308
Inventor 徐勇杨宇
Owner NANJING ZHONGHONG RUNNING ADVANCED MATERIAL TECH CO LTD
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