Adhesive coating composition for electrical steel sheet, electrical steel sheet laminate, and method for manufacturing electrical steel sheet product

An electrical steel sheet laminate comprising:

• a plurality of electrical steel sheets;
• and
• a fusion layer located between the plurality of electrical steel sheets,
• wherein the fusion layer contains a polyurethane resin and an inorganic pigment,
• the inorganic pigment is contained in an amount of 20 to 150 parts by weight with respect to 100 parts by weight of the polyurethane resin, and
• the polyurethane resin is formed by reacting an aromatic diisocyanate monomer represented by the following Chemical Formula 1 and a polyol:
• in Chemical Formula 1,
• R1 to R10 are each independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, a substituted or unsubstituted C5 to C20 heteroaryl group, or an isocyanate group,
• any one of R1 to R5 is an isocyanate group,
• any one of R6 to R10 is an isocyanate group,
• a case where R3 and R8 are simultaneously isocyanate groups is excluded,
• L is a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C2 to C10 alkynylene group, a substituted or unsubstituted C6 to C20 arylene group, or a substituted or unsubstituted C5 to C20 heteroarylene group, and
• n is any integer from 1 to 10.

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

• applying an adhesive coating composition to one surface or both surfaces of an electrical steel sheet and then curing the adhesive coating composition to form an adhesive coating layer;
• and
• stacking a plurality of electrical steel sheets in which the adhesive coating layer is formed and performing heat fusion to form a fusion layer,
• wherein the adhesive coating composition contains a polyurethane resin and an inorganic pigment,
• the inorganic pigment is contained in an amount of 20 to 150 parts by weight with respect to 100 parts by weight of the polyurethane resin, and
• the polyurethane resin is formed by reacting an aromatic diisocyanate monomer represented by the following Chemical Formula 1 and a polyol:
• in Chemical Formula 1,
• R1 to R10 are each independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, a substituted or unsubstituted C5 to C20 heteroaryl group, or an isocyanate group,
• any one of R1 to R5 is an isocyanate group,
• any one of R6 to R10 is an isocyanate group,
• a case where R3 and R8 are simultaneously isocyanate groups is excluded,
• L is a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C2 to C10 alkynylene group, a substituted or unsubstituted C6 to C20 arylene group, or a substituted or unsubstituted C5 to C20 heteroarylene group, and
• n is any integer from 1 to 10.