| abstract |
An electrical steel sheet has an insulation coating having excellent corrosion resistance and punchability even without containing chromium and is prepared by applying a coating liquid on the surface of an electrical steel sheet, followed by baking the applied coating liquid, which coating liquid contains 100 parts by weight of polysiloxane polymer prepared by copolymerizing polysiloxane with one or more resins selected from acrylic resin, styrene resin, vinyl acetate resin, polyester resin, urethane resin, polyethylene resin, polypropylene resin, polyamide resin, polycarbonate resin, phenol resin, alkyd resin, and epoxy resin, and 1 to 50 parts by weigh of one or more compounds selected from melamine, isocyanate, silane coupling agent, and oxazoline, as a cross-linking agent. |