Coating material for electrical equipment, method for manufacturing coating material for electrical equipment, and closed insulating device

Patent metadata

Field	Value
Publication number	US-2016009948-A1
Application number	US-201514861452-A
Country	US
Kind code	A1
Filing date	Sep 22, 2015
Priority date	Apr 2, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

There are provided a coating material for electrical equipment, a method for manufacturing a coating material for electrical equipment, and a closed insulating device, capable of suppressing floating and moving around of foreign substances in electrical equipment. A coating material for electrical equipment 20 in an embodiment includes: a matrix resin 50 composed of an epoxy resin; a first filler 10 dispersedly contained in the matrix resin 50 and composed of whiskers having a semiconductive specific volume resistivity; a second filler 30 dispersedly contained in the matrix resin 50 and composed of particles having a semiconductive specific volume resistivity; and a third filler 40 dispersedly contained in the matrix resin 50 and composed of a planar, fibrous, or lamellar substance having insulating properties.

First claim

What is claimed is:

1 . A coating material for electrical equipment, comprising:
a matrix resin composed of an epoxy resin; a first filler dispersedly contained in the matrix resin and composed of whiskers having a semiconductive specific volume resistivity; a second filler dispersedly contained in the matrix resin and composed of particles having a semiconductive specific volume resistivity; and a third filler dispersedly contained in the matrix resin and composed of a planar, fibrous, or lamellar substance having insulating properties.

2 . The coating material for electrical equipment according to claim 1 ,
wherein the whisker is made of ZnO, and has a tetrapod shape provided with a nucleus part and needle crystal parts extending from the nucleus part in four axial directions.

3 . The coating material for electrical equipment according to claim 1 ,
wherein the second filler is made of Fe 2 O 3 or Fe 3 O 4 .

4 . The coating material for electrical equipment according to claim 1 ,
wherein the planar third filler is made of talc or boron nitride.

5 . The coating material for electrical equipment according to claim 1 ,
wherein the fibrous third filler is composed of potassium titanate whiskers or glass milled fibers.

6 . The coating material for electrical equipment according to claim 1 ,
wherein the lamellar third filler is made of mica or smectite.

7 . The coating material for electrical equipment according to claim 1 ,
wherein a surface of the whisker constituting the first filler has been subjected to a titanate coupling treatment.

8 . The coating material for electrical equipment according to claim 1 ,
wherein the first filler is contained by 1 to 60 parts by mass with respect to 100 parts by mass of the matrix resin.

9 . The coating material for electrical equipment according to claim 1 ,
wherein a curing agent that cures the matrix resin is added.

10 . The coating material for electrical equipment according to claim 1 ,
wherein the matrix resin further contains a diluting solvent.

11 . A method for manufacturing a coating material for electrical equipment, comprising:
stirring part of an epoxy resin to be compounded and a first filler composed of whiskers made of ZnO and having a semiconductive specific volume resistivity to produce a masterbatch; and adding a remainder of the epoxy resin, a second filler composed of particles having a semiconductive specific volume resistivity, and a third filler composed of a planar, fibrous, or lamellar substance having insulating properties to the masterbatch and stirring the remainder of the epoxy resin, the second filler, the third filler, and the masterbatch to form a mixture.

12 . The method for manufacturing a coating material for electrical equipment according to claim 11 , further comprising
adding a curing agent that cures the epoxy resin to the mixture.

13 . A method for manufacturing a coating material for electrical equipment, comprising:
stirring part of an epoxy resin to be compounded, a first filler composed of whiskers having a semiconductive specific volume resistivity, a second filler composed of particles having a semiconductive specific volume resistivity, and a third filler composed of a planar, fibrous, or lamellar substance having insulating properties together with stirring particles larger in particle size than the fillers to form a first mixture; adding a remainder of the epoxy resin to the first mixture and stirring the remainder of the epoxy resin and the first mixture to form a second mixture; and filtrating the second mixture to separate the stirring particles.

14 . The method for manufacturing a coating material for electrical equipment according to claim 13 , further comprising
adding a curing agent that cures the epoxy resin to the second mixture from which the stirring particles have been separated.

15 . A closed insulating device, comprising:
a conductor extended in one direction; a metal container covering a periphery of the conductor with a predetermined gap from the conductor, and filled with an insulating gas; and a coating layer composed of the coating material for electrical equipment according to claim 1 formed on an inner wall surface of the metal container.

Assignees

• Toshiba Kk

Inventors

• Matsuzaki Hidehito
• Kusumori Hisashi
• Nojima Kenichi
• Nakano Toshiyuki
• Takei Masafumi

Classifications

• C08K3/22

  of metals · CPC title

• C08K2003/2272

  Ferric oxide (Fe2O3) · CPC title

• H02G5/06

  Totally-enclosed installations, e.g. in metal casings · CPC title

• H02B13/065

  Means for detecting or reacting to mechanical or electrical defects · CPC title

• C08K2003/2237

  of titanium · CPC title