TENSION COATING AGENT FOR FORMING INSULATING FILM WITH EXCELLENT DRYING PROPERTY, ELECTRICAL RESISTANCE AND METHOD FOR FORMING INSULATION FILM USING THAT, AND ELECTRICAL STEEL SHEET WITH INSULATING FILM BY THAT METHOD

摘要

The invention drying speed and excellent insulation chromium-based grain-oriented electrical steel sheet and insulation tension coating composition using the same film-forming method, relates to a grain-oriented electrical steel sheet having an insulating film formed by this method, in the coating process of the grain-oriented electrical steel sheet as isolated chromium-based grain-oriented electrical steel sheet to tension coating the metal phosphate and colloidal silica as a main component , the metal phosphate is magnesium phosphate first (Mg (H ₂ PO ₄ ) ₂ ) and the first aluminum phosphate (Al (H ₂ PO ₄ ) ₃ ) This mixture is mixed; Colloidal silica with respect to the metal phosphate solution 100g 30 ~ 60g, the drying rate and with an insulating dielectric, characterized in that the oxidation promoter comprises 2 ~ 15g provides a grain-oriented electrical steel sheet excellent non-chromium-based coating composition tension. According to the present invention, the chromium-insulating main problem caused by lowering of the total tension coating drying speed, can be solved by introducing a reduced adhesion and consequent oxidation promoter decrease the tension caused by the coating, also introduced oxidation promoter is the major component of the coating agent Since isolated by undried defects and adhesion problems can be reduced and ultimately eliminated can achieve the effect of improving the tension by an electrically insulating film, so as to accelerate the reaction rate of the phosphate.