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Polyester-imide resin-based varnish for low permittivity coating film

一种聚酯酰亚胺树脂、低电容的技术，应用在塑料/树脂/蜡绝缘体、涂层、电路等方向，能够解决绝缘电线和电气装置寿命短、介质击穿、绝缘涂膜损坏等问题

Active Publication Date: 2016-06-22
SUMITOMO ELECTRIC IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes damage to the insulating coating and early dielectric breakdown, which disadvantageously leads to short life of insulated wires and electrical devices

Method used

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  • Polyester-imide resin-based varnish for low permittivity coating film
  • Polyester-imide resin-based varnish for low permittivity coating film
  • Polyester-imide resin-based varnish for low permittivity coating film

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Experimental program
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Embodiment approach

[0037] Therefore, as the polyesterimide resin used in the polyesterimide resin paint for low permittivity coating film of the present invention, the following specific embodiments are enumerated: (a) a polyesterimide resin, wherein The body composition is adjusted so that the molar ratio (OH / COOH) of the hydroxyl group of the alcohol to the carboxyl group of the carboxylic acid or its derivative is 1.9 or less; Dibasic carboxylic acid, its acid anhydride or carboxylic acid of its alkyl ester as said carboxylic acid or its derivative; (c) a polyester imide resin in which a diamine containing a molecular weight of 250 or more is used; diamine compound; (d) a polyesterimide resin in which a carboxylic acid comprising a dicarboxylic acid having a molecular weight of 167 or more, an anhydride thereof, or an alkyl ester thereof is used as the carboxylic acid or a derivative thereof, And it contains diamine having a molecular weight of 250 or more as the diamine compound (hereinafter...

Embodiment

[0092] The best mode for carrying out the present invention will be described below with reference to examples. The examples are not intended to limit the scope of the invention.

[0093] [Measurement and calculation method]

[0094] First, the measurement and calculation methods performed in this embodiment are explained.

[0095] (1) Measurement of permittivity (ε)

[0096] The prepared polyesterimide resin-based varnish was coated on each copper wire (1.0 mm in diameter) and baked at a furnace temperature of 450°C to manufacture insulating polyesterimide-coated Insulated electric wires with a resin layer, the coating film thickness of the polyesterimide resin layer is 35 μm. For each of the obtained insulated wires, the permittivity of the insulating layer was measured. Measure as follows. That is, if figure 1 As shown, the silver paste was applied to three positions on the surface of the insulated wire to prepare a sample for measurement (the width of each silver pas...

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Abstract

The present invention provides: a paint capable of forming a low permittivity insulating layer, the paint containing polyester imide as a main component; and an insulated wire realizing a low permittivity by using the paint. The paint contains polyesterimide as a main component, and the polyesterimide is obtained by reacting a carboxylic acid component, an alcohol component, and a diamine compound with each other, wherein the carboxylic acid contains a dicarboxylic acid, or Its anhydride or alkyl ester. In the polyester imide resin, the monomer composition is adjusted so that the molar ratio (OH / COOH) of the hydroxyl group of the alcohol component to the carboxyl group of the carboxylic acid component is 1.9 or less, or by increasing the molecular weight of the starting monomer. Reduce the amount of imide (which exhibits high polarizability) per unit polyesterimide molecular chain. As the starting monomer, it is preferable to use a carboxylic acid component containing a dicarboxylic acid with a molecular weight of 167 or more, and / or a diamine compound with a molecular weight of 250 or more.

Description

technical field [0001] The present invention relates to polyesterimide resin-based varnishes and insulated wires using the polyesterimide resin-based varnishes, and more specifically, the present invention relates to varnishes for forming polyesterimide-based insulating coating films and including The insulating coating film is an insulated electric wire, wherein the polyesterimide-based insulating coating film has a high partial discharge (corona discharge) inception voltage. Background technique [0002] In an electrical device using a high applied voltage (such as an engine used at a high voltage), an insulated wire included in the electrical device uses a high voltage, and partial discharge (electrical halo discharge). The occurrence of corona discharge can cause local temperature rise and the generation of ozone or ions. This causes damage to the insulating coating film and early dielectric breakdown, disadvantageously resulting in short life of insulated wires and el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/30C08G18/34C08G73/16C08L61/06C08L79/08C09D5/25C09D179/08H01B7/02
CPCC08G73/16C08L75/06C09D179/08H01B3/306H01B3/308C08G18/4661C08L61/04H01B3/36
Inventor 斋藤秀明古屋雄大吉田健吾畑中悠史
Owner SUMITOMO ELECTRIC IND LTD