RU-2026108056-A - ELECTRICAL STEEL SHEET WITH ADHESIVE SURFACE COATING, LAMINATED CORE AND METHOD OF ITS MANUFACTURING

Inventors

• ФУКУТИ, Минако
• Такеда, Кадзутоси

Assignees

• НИППОН СТИЛ КОРПОРЕЙШН

Dates

Publication Date

20260505

Application Date

20240926

Priority Date

20230926

Claims (18)

1. 1. A sheet of electrical steel with an adhesive surface coating, containing:
2. electrical steel sheet; and
3. an adhesive coating that is located on at least a portion of one surface or both surfaces of an electrical steel sheet, wherein the adhesive coating includes a cross-linkable thermoplastic resin A and a thermoplastic resin B different from the cross-linkable thermoplastic resin A, wherein
4. the adhesive coating has a hardness of 200-260 MPa, and
5. After heating the adhesive coating at 200°C for 5 minutes, the hardness of the adhesive coating is 200-300 MPa.
6. 2. An electrical steel sheet with an adhesive surface coating according to claim 1, wherein the cross-linkable thermoplastic resin A is one or more resins selected from the group consisting of a (meth)-acrylic resin and a polyester resin.
7. 3. A laminated core comprising a plurality of sheets of electrical steel with an adhesive surface coating according to claim 1 or 2, wherein the sheets of electrical steel with an adhesive surface coating are laid in a stack, wherein the sheets of electrical steel are glued together by means of a cured coating of the adhesive coating.
8. 4. The laminated core according to item 3, wherein the laminated core has a filling factor of 96-98%.
9. 5. A method for manufacturing a sheet of electrical steel with an adhesive surface coating, wherein the method comprises
10. a coating step in which a coating liquid is applied to at least a part of one surface or both surfaces of the electrical steel sheet to form an adhesive coating to obtain a coated steel sheet; and
11. a coating film forming step of heating the coated steel sheet to a drying temperature of 100-200°C at a temperature increase rate of 6.0°C/sec or less, maintaining the coated steel sheet within a temperature range of -10°C relative to the drying temperature to the drying temperature for 10-90 seconds, and drying the coated steel sheet to form an adhesive coating on the surface of the electrical steel sheet.
12. 6. The manufacturing method for an electrical steel sheet with an adhesive surface coating according to claim 5, wherein, in the coating application step, the coating liquid for forming the adhesive coating contains a cross-linkable thermoplastic resin A and a thermoplastic resin B different from the cross-linkable thermoplastic resin A, and the weight ratio of the cross-linkable thermoplastic resin A to the thermoplastic resin B is 97/3-70/30.
13. 7. A method for manufacturing a laminated core, wherein the method comprises
14. a coating step of applying a coating liquid to at least a portion of one surface or both surfaces of the electrical steel sheet to form an adhesive coating to obtain a coated steel sheet;
15. a coating film formation step of heating the coated steel sheet to a drying temperature of 100-200°C at a temperature increase rate of 6.0°C/sec or less, maintaining the coated steel sheet within a temperature range of -10°C relative to the drying temperature to the drying temperature for 10-90 seconds, drying the coated steel sheet and forming an adhesive coating on the surface of the electrical steel sheet to obtain an electrical steel sheet with an adhesive surface coating;
16. a cutting stage in which a sheet of electrical steel with an adhesive surface coating is cut to obtain a cut element;
17. a stacking stage in which a number of cut-out elements are laid in a stack to produce a layered body; and
18. a gluing step in which the layered body is heated to a compression temperature within a temperature range of 200-300°C and the layered body is maintained within a range of -10°C relative to the compression temperature to the compression temperature for 5-60 minutes while applying a compression force of 0.5-10 MPa.