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Polyamic acid composition for conductor covering

A technology of polyamic acid and composition, applied in the field of polyamic acid composition for conductor covering, can solve the problems of deterioration of electrical properties, easy damage to insulating film, rupture of insulating film and the like

Active Publication Date: 2022-04-01
SKCKOLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, if the flexibility of the insulating layer is low, the insulating coating is easily damaged during processing, and the electrical characteristics may be deteriorated or cracking of the insulating coating may occur.
[0011] On the other hand, in order to improve the flexibility, when polyimide resins are produced by reacting diamines with flexible structures and dianhydrides, polyimide resins with and without diamines or dianhydrides with flexible structures are used. The problem of lower heat resistance compared to amine resin

Method used

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  • Polyamic acid composition for conductor covering
  • Polyamic acid composition for conductor covering
  • Polyamic acid composition for conductor covering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Under a nitrogen atmosphere, 850 g of dimethylformamide was added as a solvent to a 1 L reactor.

[0063] Set the temperature to 25°C, then add 72.82 g (0.36 moles) of 4,4'-ODA as a diamine monomer and dissolve it, and 77.18 g (0.35 moles) of PMDA as a dianhydride monomer from the same amount The polyamic acid was injected and polymerized in three divisions at intervals of 30 minutes. At this time, the equivalent ratio of the dianhydride monomer to the diamine monomer was 0.973.

[0064] Manufactured with a weight average molecular weight of 16,000 g / mole and a molecular weight distribution (Mw / Mn) of 1.73, including 6.7% by weight of low molecular weight polymers with a molecular weight of less than 6,000 g / mole as measured by GPC (Agilent Technology Corporation 1260 infinity 2) The polyamic acid composition of the product.

Embodiment 2

[0066] 52.56g (0.26 mol) of 4,4'-ODA and 17.35g (0.09 mol) of 4,4'-MDA were charged as diamine monomers, as shown in Table 1 below, except that 75 mol% is included for all diamine monomers 4,4'-ODA, 25 mol% of 4,4'-MDA, the weight average molecular weight measured by GPC is 16,500 g / mol, the molecular weight distribution (Mw / Mn) is 1.69, including 7.1% by weight of low molecular weight Except for the low molecular weight polymer of 6,000 g / mol, the same polyamic acid composition as Example 1 was produced.

Embodiment 3

[0068] 35.04 g (0.175 mol) of 4,4'-ODA and 34.7 g (0.175 mol) of 4,4'-MDA were added as diamine monomers, as shown in Table 1 below, except that 50 mol % is included for all diamine monomers 4,4'-ODA, 50 mole % of 4,4'-MDA, the weight average molecular weight measured by GPC is 17,000 g / mole, the molecular weight distribution (Mw / Mn) is 1.71, including 6.3 weight % of low molecular weight Except for the low molecular weight polymer of 6,000 g / mol, the same polyamic acid composition as Example 1 was produced.

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Abstract

The present invention provides a polyamic acid composition as an insulating composition for covering a conductor comprising polyamic acid and an organic solvent. The polyamic acid is produced by the reaction of a dianhydride monomer and a diamine monomer. For all The polyamic acid comprises less than 10% by weight of low molecular weight polymers with a molecular weight lower than 6,000 g / mole, and the equivalent ratio of the dianhydride monomer to the diamine monomer is 0.960 to 0.990 or 1.040 to 1.075.

Description

technical field [0001] The present invention relates to a polyamic acid composition for covering a conductor. Background technique [0002] For the insulating layer (insulating coating) covering the conductor, excellent insulation, adhesion to the conductor, heat resistance, mechanical strength, etc. are required. [0003] In addition, in electrical equipment with high applied voltage, such as motors used at high voltage, etc., high voltage is applied to insulated wires constituting the electrical equipment, and partial discharge (corona discharge) easily occurs on its insulating covered surface. [0004] Since the occurrence of corona discharge can cause a local temperature rise or the generation of ozone or ions, as a result, insulation covering of insulated wires deteriorates, causing insulation breakdown at an early stage and shortening the life of electrical equipment. [0005] For the reasons described above, an insulated wire used at a high voltage requires an increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D177/00H01B3/30H01B17/62
CPCC09D177/00H01B3/305H01B17/62
Inventor 金圣原金纪勋李吉男白承烈
Owner SKCKOLON