Electrical steel sheet and method for manufacturing the same

Abstract

An electrical steel sheet ( 10 ) is provided with a base iron ( 1 ) and an insulating film ( 2 ) formed on a surface of the base iron ( 1 ). The insulating film ( 2 ) includes 100 parts by mass of a first component containing a metal phosphate, and 5 parts by mass to 45 parts by mass of 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.

1 . An electrical steel sheet, comprising:
 a base iron; and   an insulating film formed on a surface of the base iron,   wherein the insulating film contains:   a first component containing a metal phosphate: 100 parts by mass; 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.   
     
     
         2 . An electrical steel sheet, comprising:
 a base iron; and   an insulating film formed on a surface of the base iron,   wherein the insulating film contains:   a first component: 100 parts by mass, the first component containing:
 a metal phosphate: 100 parts by mass; and 
 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 a mixture or copolymer of two or three kinds selected from the group: 1 part by mass to 50 parts by mass; 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.   
     
     
         3 . An electrical steel sheet, comprising:
 a base iron; and   an insulating film formed on a surface of the base iron,   wherein the insulating film contains:   a first component: 100 parts by mass, the first component containing:
 a colloidal silica: 100 parts by mass; and 
 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 a mixture or copolymer of two or three kinds selected from the group: 40 parts by mass to 400 parts by mass; 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.   
     
     
         4 . The electrical steel sheet according to  claim 1 , wherein the first component and the second component account for 90% or more of the insulating film. 
     
     
         5 . The electrical steel sheet according to  claim 2 , wherein the first component and the second component account for 90% or more of the insulating film. 
     
     
         6 . The electrical steel sheet according to  claim 3 , wherein the first component and the second component account for 90% or more of the insulating film. 
     
     
         7 . 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 containing a metal phosphate: 100 parts by mass; 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.   
     
     
         8 . 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 metal phosphate: 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: 1 part by mass to 50 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.   
     
     
         9 . 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 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; 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.   
     
     
         10 . The method for manufacturing an electrical steel sheet according to  claim 7 , 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. 
     
     
         11 . The method for manufacturing an electrical steel sheet according to  claim 8 , 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. 
     
     
         12 . The method for manufacturing an electrical steel sheet according to  claim 9 , 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. 
     
     
         13 . The method for manufacturing an electrical steel sheet according to  claim 7 , 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. 
     
     
         14 . The method for manufacturing an electrical steel sheet according to  claim 8 , 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. 
     
     
         15 . The method for manufacturing an electrical steel sheet according to  claim 9 , 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.