ELECTROMAGNETIC STEEL SHEET WITH INSULATION COATING FILM

To provide an electrical steel sheet with an insulating coating that is excellent in adhesion strength to an anaerobic acrylic adhesive, corrosion resistance, and tension pad resistance. Disclosed is an electrical steel sheet with an insulating coating formed by applying a surface-treatment agent to...

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Bibliographische Detailangaben
Hauptverfasser: MURAMATSU, Naoki, NAKAGAWA, Nobuko, TADA, Chiyoko
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:To provide an electrical steel sheet with an insulating coating that is excellent in adhesion strength to an anaerobic acrylic adhesive, corrosion resistance, and tension pad resistance. Disclosed is an electrical steel sheet with an insulating coating formed by applying a surface-treatment agent to at least one surface of the electrical steel sheet and drying the surface-treatment agent, wherein the surface-treatment agent contains: certain trialkoxysilane and/or dialkoxysilane (A); a silane coupling agent (B) that does not contain a polymerizable unsaturated group in its structure; plate-like silica (C); a polymerizable unsaturated-group-containing compound (D); and water, within a range satisfying the following conditions (1) to (3): (1) a mass ratio (A/B) of (A) to (B) is from 0.05 to 1.00; (2) a content of (C) is 2 mass% to 30 mass% with respect to a total mass of (A) to (D) in the surface-treatment agent; and (3) a content of (D) is 2 mass% to 18 mass% with respect to the total mass of (A) to (D) in the surface-treatment agent.