Composition for non-oriented electrical steel sheet, method of manufacturing non-oriented electrical steel sheet product, and non-oriented electrical steel sheet product
A non-oriented electrical steel sheet composition, a manufacturing method of the non-oriented electrical steel sheet product, and a non-oriented electrical steel sheet product are provided, and the non-oriented electrical steel sheet composition includes a first composition including a soluble epoxy resin and an inorganic nanoparticle of SiO 2 , TiO 2 , ZnO, or combinations thereof, and an inorganic additive of phosphoric acid (H 3 PO 4 ), sodium hydroxide (NaOH), or a combination thereof, wherein the inorganic nanoparticle is substituted in a terminal substituent group of the soluble epoxy resin, and the epoxy resin is a multifunctional epoxy resin in which there are three or more epoxy groups.
1. A non-oriented electrical steel sheet adhesive coating composition comprising:
a first composition including an epoxy resin and an inorganic nanoparticle of SiO 2 , TiO 2 , ZnO, or combinations thereof; and
an inorganic additive of sodium hydroxide (NaOH),
wherein the inorganic nanoparticle is substituted in a terminal substituent group of the epoxy resin,
the epoxy resin is a multifunctional epoxy resin in which there are three or more epoxy groups, and
wherein the content of the inorganic additive is from 1 to 10 wt % of sodium hydroxide with respect to 100 wt % of the non-oriented electrical steel sheet adhesive coating composition.
2. The non-oriented electrical steel sheet adhesive coating composition of claim 1 , wherein
the content of the inorganic nanoparticle in the first composition is from 1 to 60 wt % for 100 wt % of the first composition.
3. The non-oriented electrical steel sheet adhesive coating composition of claim 1 , wherein
the first composition includes epoxy resin and an inorganic nanoparticle of SiO 2 , TiO 2 , or ZnO, and
the content of the inorganic nanoparticle is from 1 to 40 wt % of SiO 2 , from 5 to 30 wt % of TiO 2 , or from 3 to 60 wt % of ZnO for 100 wt % of the first composition.
4. The non-oriented electrical steel sheet adhesive coating composition of claim 1 , wherein
the first composition includes epoxy resin and an inorganic nanoparticle of SiO 2 , TiO 2 , or ZnO, and
the particle size of the inorganic nanoparticle is from 3 to 50 nm for SiO 2 , from 20 to 100 nm for TiO 2 , or from 30 to 100 nm for ZnO.
5. The non-oriented electrical steel sheet adhesive coating composition of claim 1 , wherein
the epoxy resin has a softening point (Tg) of from 70 to 12° C.
6. The non-oriented electrical steel sheet adhesive coating composition of claim 1 , wherein in the epoxy resin, a solid fraction is from 10 to 50 wt %.
7. The non-oriented electrical steel sheet adhesive coating composition of claim 1 , wherein
the non-oriented electrical steel sheet composition further includes an inorganic additive of phosphoric acid (H 3 PO 4 ), and
the content of the inorganic additive is from 3 to 50 wt % of phosphoric acid with respect to 100 wt % of the non-oriented electrical steel sheet composition.
8. The non-oriented electrical steel sheet adhesive coating composition of claim 1 , wherein
the non-oriented electrical steel sheet composition includes both phosphoric acid (H 3 PO 4 ) and sodium hydroxide (NaOH), and
the epoxy resin has a softening point (Tg) of from 70 to 120° C.
9. A method for manufacturing a non-oriented electrical steel sheet product, comprising:
preparing a non-oriented electrical steel sheet composition including a first composition according to claim 1 ;
coating the non-oriented electrical steel sheet composition on one surface or both surfaces of the non-oriented electrical steel sheet;
hardening the coated non-oriented electrical steel sheet composition to form a coating layer; and
stacking and heat-bonding another non-oriented electrical steel sheet on the coating layer.
10. The method of claim 9 , wherein
the hardening of the non-oriented electrical steel sheet composition to form the coating layer is executed at a temperature from 200 to 600° C.
11. The method of claim 9 , wherein
the hardening of the non-oriented electrical steel sheet composition to form the coating layer is executed for 5 to 40 s.
12. The method of claim 9 , wherein
in the hardening of the non-oriented electrical steel sheet composition to form the coating layer, a thickness of the coating layer is from 0.5 to 10 μm.
13. The method of claim 9 , wherein
the stacking and heat-bonding of another non-oriented electrical steel sheet on the coating layer is performed at a pressure of from 1 to 1000 N.
14. The method of claim 9 , wherein
the stacking and heat-bonding of another non-oriented electrical steel sheet on the coating layer is performed at a temperature from 120 to 300° C.
15. The method of claim 9 , wherein
the stacking and heat-bonding of another non-oriented electrical steel sheet on the coating layer is performed for 5 to 180 min.
16. The method of claim 9 , wherein
in the hardening of the coated non-oriented electrical steel sheet composition to form the coating layer, a ratio of the inorganic material in the coating layer is from 0.05 to 0.6 wt %.
17. A non-oriented electrical steel sheet product, comprising:
a plurality of non-oriented electrical steel sheets; and
an insulating layer positioned between the plurality of non-oriented electrical steel sheets,
wherein the insulating layer includes a composition according to claim 1 , includes a first composition including a soluble epoxy resin and an inorganic nanoparticle of SiO 2 , TiO 2 , ZnO, or combinations thereof, and an inorganic additive of phosphoric acid (H 3 PO 4 ), sodium hydroxide (NaOH), or a combination thereof, and
the inorganic nanoparticle is substituted in a terminal substituent group of the soluble epoxy resin, and the epoxy resin is a multifunctional epoxy resin in which there are three or more epoxy groups.