Adhesive coating composition for electrical steel sheets, electrical steel sheet laminate and method for producing same

Abstract

The present invention provides an electromagnetic steel sheet laminate having a fusion layer that can bond (fasten) electromagnetic steel sheets together without using existing fastening methods such as welding, clamping, or interlocking. [Solution] The magnetic steel sheet adhesive coating composition of the present invention comprises a polyurethane resin and an inorganic pigment, and the inorganic pigment is contained in an amount of 20 to 150 parts by weight based on 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 with a polyol. TIFF2025500285000016.tif47128In the above chemical formula 1, R 1 Or R 5 One of the groups is an isocyanate group, and R 6 Or R 10 One of the groups is an isocyanate group, and R 3 and R 8 isocyanate groups at the same time are excluded.

Claims

1. Contains polyurethane resin and inorganic pigment, The inorganic pigment is included in an amount of 20 to 150 parts by weight based on 100 parts by weight of the polyurethane resin, The polyurethane resin is formed by reacting an aromatic diisocyanate monomer represented by the following chemical formula 1 with a polyol. In the above formula 1, R １ Or R １０ 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; R １ Or R ５ any one of which is an isocyanate group; R ６ Or R １０ any one of which is an isocyanate group; R ３ and R ８ isocyanate groups are 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; n is an integer from 1 to 10.

2. In the above formula 1, R １ Or R ５ Any one of R is an isocyanate; ６ Or R １０ one of which is an isocyanate; R ３ and R ８ isocyanate at the same time, R １ and R １０ The electrical steel sheet adhesive coating composition according to claim 1, further excluding cases where is simultaneously an isocyanate.

3. In the above formula 1, R １ Or R ５ Any one of R is an isocyanate; ６ Or R １０ one of which is an isocyanate; R １ Or R ５ Any one of the following and R ６ Or R １０ 2. The adhesive coating composition for electrical steel sheets according to claim 1, further excluding the case where any one of the above is symmetrical about L and is simultaneously an isocyanate.

4. 2. The adhesive coating composition for electrical steel sheets according to claim 1, wherein the aromatic diisocyanate monomer represented by Chemical Formula 1 is represented by Chemical Formula 2 below: In the above formula 2, 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.

5. 2. The adhesive coating composition for electrical steel sheets according to claim 1, wherein the polyol is a compound represented by the following formula 3: In the above formula 3, R' is a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, or a substituted or unsubstituted C5 to C20 heteroaryl group.

6. 2. The adhesive coating composition for electrical steel sheets according to claim 1, wherein the polyurethane resin comprises 30 to 50% by weight of the aromatic diisocyanate monomer and 50 to 70% by weight of the polyol.

7. The inorganic pigment is barium sulfate (Ba ２ SO ４ ), titanium dioxide (TiO ２ ), Clay (Al ２ S ２ O ５ (OH) ４ ), calcium carbonate (CaCO ３ ), silica (SiO ２ ), talc (3MgO.4SiO ２ ・H ２ 2. The electrical steel sheet adhesive coating composition according to claim 1, characterized in that the composition is at least one selected from the group consisting of:

8. 2. The electrical steel sheet adhesive coating composition according to claim 1, further comprising at least one selected from the group consisting of coupling agents, wetting agents, curing agents and curing catalysts.

9. 9. The adhesive coating composition for electrical steel sheets according to claim 8, wherein the coupling agent is present in an amount of 0.2 to 3 parts by weight based on 100 parts by weight of the mixed resin.

10. 9. The adhesive coating composition for electrical steel sheets according to claim 8, wherein the hardener is present in an amount of 0.5 to 2 parts by weight based on 100 parts by weight of the mixed resin.

11. 9. The adhesive coating composition for electrical steel sheets according to claim 8, wherein the curing catalyst is present in an amount of 0.1 to 1 part by weight based on 100 parts by weight of the mixed resin.

12. 9. The adhesive coating composition for electrical steel sheets according to claim 8, wherein the wetting agent is present in an amount of 0.05 to 0.5 parts by weight based on 100 parts by weight of the mixed resin.

13. A plurality of electromagnetic steel sheets; a bonding layer located between the plurality of magnetic steel sheets; The fusing layer contains a polyurethane resin and an inorganic pigment, The inorganic pigment is included in an amount of 20 to 150 parts by weight based on 100 parts by weight of the polyurethane resin, The polyurethane resin is formed by reacting an aromatic diisocyanate monomer represented by the following chemical formula 1 with a polyol. In the above formula 1, R １ Or R １０ 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; R １ Or R ５ any one of which is an isocyanate group; R ６ Or R １０ any one of which is an isocyanate group; R ３ and R ８ isocyanate groups are 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; n is an integer from 1 to 10.

14. applying an adhesive coating composition to one or both sides of an electrical steel sheet and then curing the composition to form an adhesive coating layer; and stacking the plurality of magnetic steel sheets on which the adhesive coating layer is formed, and heat-sealing the stacked magnetic steel sheets to form a fusion layer. The adhesive coating composition comprises a polyurethane resin and an inorganic pigment; The inorganic pigment is included in an amount of 20 to 150 parts by weight based on 100 parts by weight of the polyurethane resin, The method for producing an electrical steel sheet laminate, wherein the polyurethane resin is formed by reacting an aromatic diisocyanate monomer represented by the following chemical formula 1 with a polyol. In the above formula 1, R １ Or R １０ 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; R １ Or R ５ any one of which is an isocyanate group; R ６ Or R １０ any one of which is an isocyanate group; R ３ and R ８ isocyanate groups are 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; n is an integer from 1 to 10.

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