Adhesive preparation for layering electromagnetic steel sheets

Abstract

The invention relates to an adhesive preparation for lamination of electromagnetic steel sheets, which exhibits superior non-adhesion properties before lamination of multilayer electromagnetic steel sheets, exhibits superior adhesion properties even after long-term storage, and proposes a solidifying adhesive product with superior viscosity over a wide temperature range. The invention proposes an adhesive composition for layering electromagnetic steel plates, comprising an epoxy resin (AA) containing epoxy resin (A) with a number of epoxy groups greater than or equal to 3 in a molecule, a phenolic resin (B) with a glass transition temperature exceeding 120°C in the uncured state in differential scanning calorimetry, and a potential hardener based on amine (C), such that the epoxy resin (A) contains epoxy resin with a softening temperature equal to or higher than 60°C, The phenoxy resin (B) content is in the range of 20 to 80 parts by weight based on 100 parts by weight of epoxy resin (AA), and the hydrostatic conversion temperature of the solidified adhesive product produced in the sweepable temperature test does not exceed 160°C.