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Polyamide-imide resin insulating coating material, insulated wire and coil

A polyamide-imide resin and insulating coating technology, which is applied in the direction of insulating cables, coils, transformers/inductor coils/windings/connections, etc., can solve the problems of easy partial discharge and high dielectric constant, and achieve coating operations Excellent performance and cost performance

Inactive Publication Date: 2012-12-26
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, one of the disadvantages of polyamide-imide resin is that it has a high dielectric constant, and when it is used as a material for the insulating coating of an insulated wire, it is easy to generate partial discharge.

Method used

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  • Polyamide-imide resin insulating coating material, insulated wire and coil
  • Polyamide-imide resin insulating coating material, insulated wire and coil
  • Polyamide-imide resin insulating coating material, insulated wire and coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0036] The polyamide-imide resin insulating varnish of this embodiment can form an insulating coating of an insulated wire by coating and firing on a conductor such as copper or another coating on a conductor.

[0037] As the conductor of the insulated wire, conductors of various shapes such as round wires and flat (square) wires can be used. In addition, another coating such as an adhesive layer for improving adhesion may be used on the upper and lower sides of the insulating coating, and a self-lubricating layer or a self-welding layer may be provided on the insulating coating.

[0038] In addition, the polyamide-imide resin insulating paint can form an insulating coating even when it is applied and baked on members other than wires, such as films and substrates.

[0039] figure 1 An example of the cross section of the insulated wire according to the embodiment is shown. The insulated wire 1 of the present embodiment has a conductor 10 and an insulating coating 11 covering...

Embodiment 1

[0082] First, prepare a flask equipped with a stirrer, a nitrogen inflow tube, a thermometer, a condenser tube, and a quantitative receiver for moisture, and put 37.3 g of 4-aminobenzoic acid and 1,2,3,6-tetrahydrophthalic anhydride into the flask. 41.3 g was dissolved in 300 g of N-methyl-2-pyrrolidone together with 30 g of xylene as an azeotropic solvent. Then, the solution was stirred at 180° C., and the generated water and xylene were removed from the system to obtain a reaction liquid containing a carboxylic acid compound as an embodiment of the carboxylic acid compound (D).

[0083] Next, after cooling the reaction solution to 60°C, 40.8 g of 4,4'-diphenylmethane diisocyanate, which is the diisocyanate component (E) of the embodiment, was put into the flask, stirred at 130°C for 1 hour, and further After stirring at 140°C for 1.5 hours, an amide compound having a reactive terminal group was synthesized.

[0084] In addition, in another flask, 502.1 g of 2,2-bis(4-aminop...

Embodiment 2

[0087] First, in a flask, 33.6 g of 4-aminobenzoic acid, 37.2 g of 1,2,3,6-tetrahydrophthalic anhydride, and 30 g of xylene as an azeotropic solvent were dissolved in N-methyl-2 - pyrrolidone 300 g. Then, the solution was stirred at 180° C., and the generated water and xylene were removed from the system to obtain a reaction liquid containing a carboxylic acid compound as an embodiment of the carboxylic acid compound (D).

[0088] Next, after cooling the reaction solution to 60°C, 128.6 g of 4,4'-diphenylmethane diisocyanate as the diisocyanate component (E) of the embodiment and 70.5 g of trimellitic anhydride as the tricarboxylic anhydride were mixed with N-methyl - 327.2 g of 2-pyrrolidone was put into a flask together, stirred at 130° C. for 1 hour, and further stirred at 140° C. for 1.5 hours to synthesize an amide compound having a reactive terminal group.

[0089] In addition, in another flask, 451.9 g of 2,2-bis(4-aminophenoxyphenyl)propane as the diamine component (A...

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Abstract

The invention provides a polyamide-imide resin insulating coating material that allows the formation of an insulating film excellent in partial discharge resistance and is excellent in coating workability and cost performance, as well as to provide an insulated wire using the polyamide-imide resin insulating coating material and a coil using the insulated wire. A polyamide-imide resin insulating coating material includes a polyamic acid having a thermally crosslinkable reactive group, and an amide compound having a thermally crosslinkable reactive group. The polyamic acid includes an acid synthesized using at least a diamine component, a tetracarboxylic dianhydride and a cross-linking agent as raw materials. The cross-linking agent includes an amino group or an anhydride group and a thermally crosslinkable reactive group. The amide compound includes a compound synthesized using at least a carboxylic acid compound and a diisocyanate component as raw materials. The carboxylic acid compound includes a thermally crosslinkable reactive group that is crosslinkable with the cross-linking agent contained in the polyamic acid.

Description

technical field [0001] The present invention relates to polyamide-imide resin insulating paint, insulated wire and coil. Background technique [0002] Conventionally, an insulated wire having an insulating coating formed using a polyamide-imide resin insulating varnish is known (for example, refer to Patent Document 1). The polyamide-imide resin insulating paint is a heat-resistant high-molecular resin that contains amide groups and imide groups in a roughly 50-50 ratio and is excellent in heat resistance, mechanical properties, hydrolysis resistance, and the like. [0003] Polyamide-imide resin insulating coatings are generally passed through N-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAC), two It is produced by the decarboxylation reaction of 4,4'-diphenylmethane diisocyanate (MDI) in a polar solvent such as methyl imidazolinone (DMI) and trimellitic anhydride (TMA) as the main two components. [0004] As a method for producing a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/08C09D5/25C08G73/14H01B7/02H01F5/00
CPCH01F27/32C09D179/08H01B3/305H01B3/306C08G73/101C08G73/1035H01F27/2823
Inventor 牛渡刚真本田佑树锅岛秀太菊池英行
Owner HITACHI METALS LTD
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