Method for manufacturing electrical steel sheet product

A method for manufacturing an electrical steel sheet product, the method comprising:

• preparing an adhesive coating composition;
• forming an adhesive coating layer by applying and then curing the adhesive coating composition onto a surface of an electrical steel sheet;
• forming a heat-fused layer by laminating and heat-fusing a plurality of electrical steel sheets on which the adhesive coating layers are formed;
• and
• cooling the heat-fused electrical steel sheets at a cooling rate of 0.05 to 20° C./min,
• wherein:
• in the cooling of the heat-fused electrical steel sheets at the cooling rate of 0.05 to 20° C./min,
• a holding pressing force is 1,000 N/mm2 or less,
• the adhesive coating composition contains an organic/inorganic complex and an inorganic substance,
• the organic/inorganic complex comprises an organic resin and an inorganic nanoparticle,
• the inorganic nanoparticle is at least partially substituted for a functional group of the organic resin,
• the organic resin is a water-soluble epoxy resin,
• the water-soluble epoxy resin is a multifunctional epoxy resin having three or more epoxy groups, and the water-soluble epoxy resin has a weight average molecular weight of 1,000 to 50,000, a softening temperature (Tg) of 70 to 120° C., and a solid fraction of 10 to 50 wt %,
• the inorganic nanoparticle includes one or more of SiO2, TiO2, ZnO, Al2O3, MgO, CaO, and ZrO2, and
• the inorganic substance is phosphoric acid (H3PO4) or sodium hydroxide (NaOH).