Method for manufacturing electrical steel sheet

Patent metadata

Field	Value
Publication number	US-2016284455-A1
Application number	US-201615179171-A
Country	US
Kind code	A1
Filing date	Jun 10, 2016
Priority date	Sep 15, 2009
Publication date	Sep 29, 2016
Grant date	—

Abstract

A treatment solution is applied on a surface of a base iron; and the treatment solution is baked and dried. The treatment solution contains a first component: 100 parts by mass in solid content, and a second component composed of particles of one or more kinds selected from a group consisting of a polyolefin wax, an epoxy resin and an acrylic resin, the particles having an average particle size of 2.0 μm to 15.0 μm and a melting point of 60° C. to 140° C.: 5 parts by mass to 45 parts by mass in resin solid content. The first component contains a colloidal silica: 100 parts by mass, and an emulsion of one kind selected from a group consisting of an acrylic resin, an epoxy resin and a polyester resin which have an average particle size of 0.05 μm to 0.50 μm, or an emulsion of a mixture or copolymer of two or three kinds selected from the group: 40 parts by mass to 400 parts by mass in resin solid content.

First claim

1 - 15 . (canceled)

16 . A method for manufacturing an electrical steel sheet, comprising:
applying a treatment solution on a surface of a base iron; and baking and drying the treatment solution, wherein the treatment solution contains: a first component: 100 parts by mass in solid content, the first component containing:
a colloidal silica: 100 parts by mass; and
an emulsion of one kind selected from a group consisting of an acrylic resin, an epoxy resin and a polyester resin which have an average particle size of 0.05 μm to 0.50 pm, or an emulsion of a mixture or copolymer of two or three kinds selected from the group: 40 parts by mass to 400 parts by mass in resin solid content; and
a second component composed of particles of one or more kinds selected from a group consisting of a polyolefin wax, an epoxy resin and an acrylic resin, the particles having an average particle size of 2.0 μm to 15.0 μM and a melting point of 60° C. to 140° C.: 5 parts by mass to 45 parts by mass in resin solid content.

17 . The method for manufacturing an electrical steel sheet according to claim 16 , wherein a temperature to be reached in the baking and drying is 150° C. to 300° C., and a time therefor is 3 seconds to 15 seconds.

18 . The method for manufacturing an electrical steel sheet according to claim 16 , wherein the first component and the second component account for 90% or more of the treatment solution when it is converted into a solid content.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Takeda Kazutoshi
• Kosuge Kenji
• Arai Satoshi
• Ishizuka Kiyokazu

Classifications

• H02K1/12

  Stationary parts of the magnetic circuit · CPC title

• H01F1/18 Primary

  with insulating coating · CPC title

• H01F1/14775

  in the form of sheets · CPC title

• B05D3/0254

  After-treatment · CPC title

• C23C22/00 Primary

  Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals · CPC title