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Polyimide varnish comprising aromatic carboxylic acid for conductor coating and manufacturing method therefor

A technology of polyimide clear and aromatic carboxylic acid, which is applied in the direction of cable/conductor manufacturing, heat treatment equipment, conductor/cable insulation, etc. It can solve the problems of non-protruding conductor viscosity and poor appearance, and prevent oxidation , Improve process handling, excellent thermal stability

Active Publication Date: 2021-03-30
PI尖端素材株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, although conventional polyimide resins have excellent physical properties, their adhesion to conductors is not outstanding, so they have a problem of poor appearance when forming insulating coatings.

Method used

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  • Polyimide varnish comprising aromatic carboxylic acid for conductor coating and manufacturing method therefor
  • Polyimide varnish comprising aromatic carboxylic acid for conductor coating and manufacturing method therefor
  • Polyimide varnish comprising aromatic carboxylic acid for conductor coating and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0153] Preparation Example 1: Preparation of Polyamic Acid Solution

[0154] In a 500ml reactor equipped with a stirrer, nitrogen injection, and discharge pipe, 364.6g of NMP was injected under the condition of injecting nitrogen gas, and after the temperature of the reactor was set to 30°C, 61.4g of ODA and 63.5g of PMDA were injected After that, confirm complete dissolution.

[0155] Under a nitrogen atmosphere, the temperature was heated to 50° C., and after stirring was continued for 120 minutes, a polyamic acid solution having a viscosity of 10,000 cP at 23° C. was prepared.

preparation example 2

[0156] Preparation Example 2: Preparation of polyimide varnish

[0157] After setting the temperature of the reactor to 50°C, add OFS-6011 as an alkoxysilane coupling agent to the polyamic acid solution of the above Preparation Example 1 in a weight ratio of 1:50:1 as an antioxidant 5% by weight, the compound of chemical formula 1-1 with a decomposition temperature of about 402 ° C, BYK-378 as a silicon additive, and then slowly stirred for 30 minutes to prepare alkoxysilane coupling agent, antioxidant and silicon Mixture of additives.

[0158]

[0159]Next, after setting the temperature of the reactor to 50° C., 5 mol of PMA was added to 100 mol of ODA. Fully stir before the end of the reaction, add NMP so that the total solid content is about 25% by weight, the viscosity is about 3000cP, the molar ratio of diamine monomer, dianhydride monomer and aromatic carboxylic acid is 100:95:5, prepared A polyimide varnish containing 0.01 parts by weight of an alkoxysilane couplin...

preparation example 3

[0160] Preparation Example 3: Preparation of Polyimide Coating

[0161] In the coating hardening furnace, the polyimide varnish of the above-mentioned preparation example 2 is adjusted to the conductor through the copper wire of 1 mm, and the thickness of each coating is between 2 and 6 μm, and the maximum temperature of the coating hardening furnace is adjusted At 500°C, the coating speed of the copper wire was adjusted to 12 m / min, and the copper wire was coated 7 times. After repeated drying and hardening, an electric wire containing a polyimide coating with a coating thickness of 35 μm was prepared.

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Abstract

The present invention relates to polyimide varnish for conductor coating, the polyimide varnish comprising: a polyamic acid solution prepared through polymerization of at least one dianhydride monomerand at least one diamine monomer in an organic solvent; an aromatic carboxylic acid having four or more carboxylic acid groups; an alkoxy silane coupling agent; and an antioxidant, wherein the polyimide varnish has a solid content of 15 to 38 wt% on the basis of the total weight thereof, and a viscosity at 23 DEG C of 500 to 9,000 cP, and the coating prepared from the polyimide varnish has a degree of softening resistance of 520 DEG C or higher and a breakdown voltage (BDV) of 8 kV / mm or higher.

Description

technical field [0001] The invention relates to a polyimide varnish for conductor coating and a preparation method thereof. The polyimide varnish contains aromatic carboxylic acid. Background technique [0002] The insulating layer covering the conductor (insulation coating) is required to have excellent insulating properties, adhesiveness of the conductor, heat resistance, mechanical strength, and the like. [0003] In addition, for electrical appliances with high application voltage, such as motors used under high voltage, high voltage is applied to the insulated wires that make up the electrical appliances, so partial discharge (corona discharge) is likely to occur on the insulating coating surface. [0004] Due to the occurrence of corona discharge, the local temperature may rise or the generation of ozone or ions may be caused. As a result, the insulation coating of the insulated wire will be heated, and the insulation will be destroyed in the early stage, which will sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/08H01B13/00H01B13/06
CPCC08L79/08C08G73/1071C08K5/521C08K5/5419C08K5/092H01B13/0016H01B13/0036H01B13/06C09D179/08H01B3/306
Inventor 黄仁焕李翼祥崔祯烈
Owner PI尖端素材株式会社