Coating composition for electrical steel sheet, electrical steel sheet, laminated core, and rotary electric machine
AssigneeNippon Steel Corporation
InventorsKazutoshi Takeda, Shinsuke Takatani, Minako Fukuchi, Ichiro Tanaka
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Abstract
An electrical steel sheet used for a laminated core is an electrical steel sheet including an insulation coating 3 on a surface of a base steel sheet 2, the insulation coating being coated with a coating composition for an electrical steel sheet. The coating composition for an electrical steel sheet includes: an epoxy resin; an epoxy resin curing agent; and an elastomer-modified phenolic resin, in which the amount of the elastomer-modified phenolic resin is 10 parts by mass to 100 parts by mass with respect to 100 parts by mass of the epoxy resin.
Claims6
A coating composition for an electrical steel sheet comprising:
- an epoxy resin;
- an epoxy resin curing agent;
- and
- an elastomer-modified phenolic resin,
- wherein an amount of the elastomer-modified phenolic resin is 10 parts by mass to 100 parts by mass with respect to 100 parts by mass of the epoxy resin,
- wherein a weight average molecular weight of an elastomer portion of the elastomer-modified phenolic resin is 4,000 to 200,000,
- wherein when the coating composition is applied to a surface of the electrical steel sheet and cured at a reaching temperature during baking of 120 to 200° C. and baking time of 5 to 40 seconds, a curing shrinkage rate measured by changing a coating thickness according to JIS K 6941 is 15% or less.
Dependencies are inferred from the claim text.