Insulating film

An insulating film and insulation technology, applied in the direction of insulators, insulators, insulated conductors, etc., to achieve the effects of long insulation life, excellent heat resistance and discharge degradation resistance

Inactive Publication Date: 2014-06-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is still a further demand for insulating materials with high resistance to thermal deterioration and discharge deterioration and long insulation life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited by these examples. However, the measurement methods in Examples and the like are as follows.

[0050] (1) Weight average molecular weight

[0051] The weight average molecular weight is measured in terms of polyethylene oxide (PEO) using gel permeation chromatography (GPC). GPC conditions are shown below.

[0052] GPC device: product name "HLC-8120GPC" (manufactured by Tosoh Corporation)

[0053] Column: "TSK gel super AWM-H" + "TSK gel super AW4000" + "TSK gel super AW2500" (manufactured by Tosoh Corporation)

[0054] Flow: 0.4ml / min

[0055] Concentration: 1.0g / l

[0056] Injection volume: 20μl

[0057] Column temperature: 40°C

[0058] Eluent: 10mM-LiBr+10mM-phosphoric acid / DMF

[0059] (2) Insulation life time

[0060] Using a withstand voltage tester (product name "5051A", manufactured by Tsuruga Electric Corporation), the applied ...

Synthetic example 1

[0066] Add 1.00 mol of trimellitic anhydride (TMA), 1.00 mol of diphenylmethane diisocyanate (MDI) and 1063 g of N-methyl-2-pyrrolidone (NMP) into a four-neck flask equipped with a mechanical stirrer with stirring blades, °C for two hours. Then, the temperature was raised to 180° C., and the reaction was carried out for 3 hours. Thus, a polyamideimide varnish was obtained. The weight average molecular weight of the obtained polyamideimide resin was 65,500. In addition, the resin solid content of the obtained polyamideimide varnish was adjusted to 25% by weight, and the adjusted varnish (solvent: NMP) was measured at 25% by weight using a digital viscometer HBDV-I Prime (manufactured by Brookfield Engineering Laboratories, Inc.). The viscosity at ℃ was 66.4Pa?s.

Embodiment 1

[0068] Add nano-silica (product name "AEROSIL （R） RA200H", produced by Nippon Aerosil Co. Ltd.), so that the added amount was 2.5 parts by weight relative to the solid content of the resin, and dispersed using a roll mill. The obtained silica dispersion varnish was so that the thickness after drying was 50 μm Coated on a glass substrate. It was heated at 80°C for 15 minutes, then heated at 150°C for 15 minutes, and after cooling to room temperature, it was released from the glass substrate to obtain an independent semi-cured film. Fix the semi-cured film The end of the cured film was further heated at 340° C. for 15 minutes to obtain a cured film of polyamideimide.

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Abstract

Provided is an insulating film which has excellent heat resistance, excellent discharge deterioration resistance and long insulation life. An insulating film of the present invention contains a heat-resistant resin and fine insulating particles that are dispersed in the heat-resistant resin. The inscribed circles of regions that do not contain the fine insulating particles have an average diameter of 80-900 nm.

Description

technical field [0001] The present invention relates to an insulating film excellent in heat resistance and discharge degradation resistance. Background technique [0002] In recent years, the operating voltage tends to increase in automotive motors, industrial motors, and inverters for large equipment, and high heat resistance and voltage resistance are also required for insulating materials used therein. [0003] The withstand voltage of insulating materials decreases year by year due to the influence of thermal deterioration and discharge deterioration. Specifically, in terms of discharge degradation, if there are defects such as small voids, cracks, or scratches in the insulating material, partial discharge (corona discharge), which is a weak discharge, is generated at the defect by applying a voltage. It is considered that local destruction occurs due to repeated occurrence of the partial discharge, which gradually develops into dendrites, and finally leads to insulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/00H01B3/30H01B17/56
CPCH01B3/002H01B3/306H01B7/292Y10T428/268
Inventor 正木俊辅西森才将藤田浩之林和德藤木淳
Owner NITTO DENKO CORP
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