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Polyester imide resin based varnish for low-permittivity coating

A polyester-imide resin and low-capacitance technology, applied in plastic/resin/wax insulators, coatings, circuits, etc., can solve problems such as dielectric breakdown, damage to insulating coatings, short life of insulated wires and electrical devices, etc.

Active Publication Date: 2013-04-24
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
  • Polyester imide resin based varnish for low-permittivity coating
  • Polyester imide resin based varnish for low-permittivity coating

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Experimental program
Comparison scheme
Effect test

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

Provided are: a varnish capable of forming a low-permittivity insulating layer which comprises a polyester imide as the main component; and an insulated wire in which a low permittivity is attained using the varnish. The varnish comprises, as the main component, a polyester imide resin obtained by reacting a carboxylic component that consists of a carboxylic acid component containing a dicarboxylic acid, or an anhydride or alkyl ester thereof with an alcohol component and a diamine compound. In the polyester imide resin, the monomer composition is regulated so as to give a molar ratio (OH / COOH) of the hydroxyl of the alcohol component to the carboxyl of the carboxylic component of 1.9 or less, or the content of imido (which exhibits high polarizability) per unit polyester imide molecular chain is reduced by increasing the molecular weights of the starting monomers. It is preferable to use, as the starting monomers, a carboxylic acid component containing a dicarboxylic acid having a molecular weight of 167 or more and / or a diamine compound having 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 Applications(China)
IPC IPC(8): H01B3/30C08G18/34C08G73/16C08L61/06C08L79/08C09D5/25C09D179/08H01B7/02
CPCC09D179/08C08L75/06H01B3/36H01B3/306C08G73/16C08G18/4661H01B3/308C08L61/04
Inventor 斋藤秀明古屋雄大吉田健吾畑中悠史
Owner SUMITOMO ELECTRIC IND LTD