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Insulated electric wire

A technology of insulated wires and insulating films, applied in the direction of insulated cables, insulators, insulated conductors, etc., can solve the problems of insulated wires such as reduced flexibility, difficult to withstand processing, cracks, etc.

Active Publication Date: 2014-02-12
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, since the aromatic polyimide film is formed, the flexibility of the insulating film of the insulated wire decreases, and the insulating film tends to be broken or cracked during winding.
In particular, in the above-mentioned rectangular enameled wire having a small size, when the processing stress received at the time of winding is more intense, it will be difficult to withstand the processing.

Method used

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Examples

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Embodiment

[0037] Hereinafter, the present invention will be specifically described in Examples, but the present invention is not limited to these Examples in any way. In the following description, unless otherwise specified, "part" means "part by mass".

[0038] [Preparation of polyamideimide resin varnish]

preparation Embodiment 1

[0040] In a flask equipped with a stirrer, a nitrogen inflow pipe, and a heating / cooling device, a mixture of 2,4'-MDI and 4,4'-MDI and dimer acid diisocyanate (DDI) were put in as the isocyanate component, and trimellitic anhydride was put in as Acid component. As a solvent, 150 parts of N-methyl-2-pyrrolidone was added to 100 parts of the total amount of the acid and isocyanate components, and the temperature was raised from room temperature to 140°C over 2 hours while stirring under a nitrogen atmosphere. . After reacting at this temperature for 3 hours, dilute with 83 parts of N,N-dimethylformamide (DMF), cool to room temperature, and obtain a polyamide-imide resin varnish (B) with a resin content of 30% by mass. -1).

preparation Embodiment 2～11

[0042] Polyamide-imide resin varnishes (B-2) to (B-11) were obtained in the same manner as in Preparation Example 1, except that the ratio of the isocyanate component was changed to the ratio shown in Table 1.

[0043] [Table 1]

[0044]

[0045] [Manufacture of insulated wire]

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Abstract

The invention relates to an insulated electric wire. According to one embodiment, an insulated electric wire is disclosed. The insulated electric wire includes a conductor and an insulating film formed on the conductor, the insulating film including a first layer of a first polyamideimide containing an adhesion improver, a second layer of a second polyamideimide obtained by reacting an isocyanate component containing 10 to 70 mol % in total of 2,4'-diphenylmethane diisocyanate and dimer acid diisocyanate react with an acid component formed on the first layer, and a third layer of a polyimide formed on the second layer.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from prior Japanese Patent Application No. 2012-162117 filed on July 20, 2012, which is incorporated herein by reference in its entirety. technical field [0003] Embodiments herein relate generally to insulated wires that may be used for coils of electric motors and the like. Background technique [0004] In recent years, with the miniaturization of electronic equipment and electric equipment, the mainstream of coils equipped in these equipment has changed from coils using conventional enameled wire (round enameled wire) with a circular cross section to coils using a rectangular cross section. A coil of enameled wire (rectangular enameled wire). The rectangular enameled wire is manufactured by applying an insulating varnish on a conductor having a rectangular cross section (rectangular conductor) and baking to form an insulating film. By using the rectangular enameled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/02
CPCH01B7/0225H01B3/306H01F27/2823H01B3/308Y10T428/2933
Inventor 久田友和天野优气平井一臣川地由珠成田匡寿平野辰美金光大足田靖成
Owner DENSO CORP
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