Method of manufacturing electrical steel sheet with adhesive insulating coating and method of manufacturing stacked electrical steel sheet
US11186076B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2017 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | Jun 10, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/206
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Provided is a method of manufacturing an electrical steel sheet with an adhesive insulating coating that has excellent high-temperature adhesive property and high-temperature oil resistance and, even after being stacked and subjected to stress relief annealing, has excellent magnetic properties (iron loss, magnetic flux density). The method comprises: applying a coating material to at least one side of an electrical steel sheet, the coating material containing (a) an aqueous epoxy resin, (b) a high-temperature hardening crosslinking agent in an amount of 30 parts by mass or less with respect to 100 parts by mass of the aqueous epoxy resin, in terms of solid content, (c) metal oxide particles, and (d) a solvent; and baking the coating material applied to the electrical steel sheet, under a condition of a peak steel sheet temperature of 150° C. or more and less than 230° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.