Electrical insulating resin composition for partial-discharge resistance

Patent metadata

Field	Value
Publication number	US-11629270-B2
Application number	US-201615742853-A
Country	US
Kind code	B2
Filing date	Jul 7, 2016
Priority date	Jul 9, 2015
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

An object of the present invention is to provide an improved partial discharge-resistant electrical insulating resin composition that can inhibit deterioration of an insulator due to partial discharge. The partial discharge-resistant electrical insulating resin composition of the present invention comprises boehmite alumina and a resin.

First claim

The invention claimed is:

1. A partial discharge-resistant electrical insulating resin composition comprising boehmite alumina and a resin, wherein the boehmite alumina is nanoparticles having an average particle diameter of 20-500 nm in an amount of 0.1 to 30 wt %, wherein the resin is a polyimide resin, wherein the boehmite alumina has a shape of plate-like particles and an aspect ratio (length/width) of 2 to 35, and wherein the boehmite alumina is dispersed in the resin by using boehmite alumina dispersed in an organic solvent or water during mixing of the boehmite alumina with the resin.

2. The partial discharge-resistant electrical insulating resin composition according to claim 1 , which is resistant to an inverter surge.

3. The partial discharge-resistant electrical insulating resin composition according to claim 1 , which is for use with an electrical apparatus in which inverter control is performed.

4. An insulating varnish comprising the partial discharge-resistant electrical insulating resin composition according to claim 1 and a solvent.

5. An electrodeposition paint comprising the partial discharge-resistant electrical insulating resin composition according to claim 1 and a solvent.

6. A cured product formed from the partial discharge-resistant electrical insulating resin composition according to claim 1 .

7. A method for producing the partial discharge-resistant electrical insulating resin composition according to claim 1 , comprising the steps of:
pre-gelling the boehmite alumina; and
mixing the pre-gelled boehmite alumina with the resin.

8. An electric wire comprising:
a conductor; and
an insulating coating comprising a single layer or a plurality of layers formed on an outer periphery of the conductor, wherein the insulating coating comprises at least one layer of a cured product of the partial discharge-resistant electrical insulating resin composition according to claim 1 .

9. A rotating electric machine comprising the electric wire according to claim 8 .

10. An insulating film comprising an insulating layer comprising the partial discharge-resistant electrical insulating resin composition according to claim 1 or a cured product thereof.

11. An insulating coating comprising an insulating layer comprising the partial discharge-resistant electrical insulating resin composition according to claim 1 or a cured product thereof.

12. The partial discharge-resistant electrical insulating resin composition according to claim 1 , wherein the amount of boehmite alumina is 2 to 5% by mass.

13. The partial discharge-resistant electrical insulating resin composition of claim 1 , wherein the average particle diameter of the boehmite alumina is about 20 nm and wherein the mass % of boehmite alumina in the composition is from 0.5% to 5%.

Assignees

• Sumitomo Seika Chemicals
• Aist
• Shizuoka Institute Of Science And Tech

Inventors

• Hayashizaka Noriyuki
• Kawasaki Kazunori
• Yamashita Masayuki
• Ebina Takeo
• Ishida Takahiro
• HATTORI Satomi

Classifications

• H01B3/44

  vinyl resins; acrylic resins (silicones H01B3/46) · CPC title

• H01B3/307

  Other macromolecular compounds · CPC title

• H01B3/421

  Polyesters · CPC title

• H01B3/302

  Polyurethanes or polythiourethanes; Polyurea or polythiourea · CPC title

• H01B3/306

  Polyimides or polyesterimides · CPC title