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High-temperature resistant polyimide wire enamel and preparation method thereof

A technology of polyimide paint and enameled wire paint, applied in the direction of coating, etc., can solve the problems of poor continuity of paint film and reduced toughness of paint film.

Active Publication Date: 2014-08-06
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a high temperature resistant polyimide wire enamel, which solves the problem of polyimide wire enamel storage stability, poor film continuity and high temperature production in the prior art. Technical problems such as paint film toughness reduction

Method used

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  • High-temperature resistant polyimide wire enamel and preparation method thereof
  • High-temperature resistant polyimide wire enamel and preparation method thereof
  • High-temperature resistant polyimide wire enamel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 400.5 grams of dried 4,4'-diaminodiphenyl ether and 2055 grams of N,N-dimethylacetamide into the reaction kettle, stir and dissolve completely at room temperature, and add 480.0 grams of dried homogeneous Pyrylenetetracarboxylic dianhydride was stirred and reacted for 2 hours, and the polymerization temperature was -5 to 20°C to obtain a wine red transparent and viscous polyamic acid solution with a solid content of 30%.

[0053] 388.4 grams of dimethyl terephthalate, 1859.2 grams of hexamethylenediamine and 1000 grams of hexamethylene are added to the reactor, a reflux device and a water separator are installed on the reactor, and cyclohexane is added in the water separator, and the temperature rises and stirs. reflow. When the amount of methanol no longer increases, the reaction is terminated. The product was washed with water and methanol, and dried to obtain chain-extended diamine.

[0054] Chain-extending bismaleimide was prepared by chain-extending diamine a...

Embodiment 2

[0058] Add 496.6 grams of dried 4,4'-diaminodiphenyl sulfone and 2751 grams of N,N-dimethylacetamide into the reaction kettle, stir and dissolve completely at room temperature, and add 682.4 grams of dried 2 , 3,3',4'-diphenyl ether tetracarboxylic dianhydride, stirred for 2 hours, and the polymerization temperature was -5 to 20°C to obtain a wine red transparent and viscous polyamic acid solution with a solid content of 30%.

[0059] Add 194.2 grams of dimethyl terephthalate, 1188 grams of 4,4'-diaminodiphenylmethane and 1000 g of cyclohexane into the reaction kettle, install a reflux device and a water separator on the reaction kettle, and fill the water separator Cyclohexane, heated and stirred, refluxed. When the amount of methanol no longer increases, the reaction is terminated. The product was washed with water and methanol, and dried to obtain chain-extended diamine.

[0060] Chain-extending bismaleimide was prepared by chain-extending diamine and maleic anhydride thr...

Embodiment 3

[0064] Investigation on the Properties of Polyimide Wire Enamel

[0065]Using the "XND-1 Tu-4" viscometer produced by Wuhan Glamor Testing Equipment Co., Ltd., according to the test method specified in the national standard "GB / T1723 Coating Viscosity Measurement Method", test the above-mentioned Example 1 and Example 2. The obtained polyimide wire enamel has a viscosity value of 40 seconds and 35 seconds respectively.

[0066] Copper round wires with a nominal diameter of 0.5 mm are used to coat enameled wires on a horizontal enamelling machine. Turn on the circulation fan, the wind speed of the circulation fan is 2800RPM, the length of the oven is 3.50m, the furnace temperature rises to 400°C, and the wires are laid out, and the enamelling machine is continuously annealed and softened. The specification of the felt is 40mm×12mm in width×thickness, and the felt is flatly clamped on both sides of the wire with a felt splint. The distance between the felt and the paint tank is...

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Abstract

The invention discloses high-temperature resistant polyimide wire enamel and a preparation method thereof. The wire enamel comprises the following components in percent by weight based on total mass of enamel liquor: 50-80 percent of polyimide acid solution with solid content of 30 percent and 0-40 percent of chain-extended bismaleimide prepolymer solution with solid content of 30 percent. The preparation method of the high-temperature resistant polyimide wire enamel comprises the steps of mixing the polyimide acid solution and the chain-extended bismaleimide prepolymer solution according to proportions, adding an organic solvent to adjust the solid content and viscosity of the enamel liquor, and stirring to uniformly mix, thus obtaining claret-red transparent viscose polyimide wire enamel. The wire enamel disclosed by the invention is good in storage stability, resistant to high temperature, uniform in enamel film, good in flexibility, simple and easy to operate in an enamel and wire preparation process, high in raw material utilization rate, little in three-waste pollution and easy to realize industrialization; the soft breakdown voltage and the breakdown voltage of the wire enamel are remarkably higher than 240-level polyimide enamelled round copper wire standard in China respectively. The high-temperature resistant polyimide wire enamel can be used for insulation of a high-load, high-power and refrigerant-resistant motor and has broad market prospects.

Description

technical field [0001] The invention belongs to the field of wire enamel and its preparation, and in particular relates to a high-temperature-resistant polyimide 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. With the development of the times and the advancement of science and technology, a large number of high-power and high-load motors have appeared in many fields of enameled wire application, which puts forward higher requirements for the temperature resistance level of enameled wire. For example, the speed of China's high-speed rail has reached more than 300 kilometers per hour. The increase in the speed of various vehicles will inevitably put forward higher requirements for the temperature resistance of moto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/08C09D5/25C09D7/12C08G73/10
Inventor 朱亚辉左晓兵宁春花马洁王敏智
Owner HUAWEI TEHCHNOLOGIES CO LTD
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