Semi-inorganic environment-friendly insulating paint for non-oriented silicon steel and coating preparation method thereof

Abstract

The invention discloses a semi-inorganic environment-friendly insulating paint for non-oriented silicon steel and a coating preparation method thereof, and belongs to the technical field of non-oriented silicon steel paint. The semi-inorganic environment-protecting insulating paint for the non-oriented silicon steel is prepared by the following components by mass percent: 5-40% of aluminum dihydrogen phosphate, 0.5-10% of manganese dihydrogen phosphate, 1-12% of zinc dihydrogen phosphate, 0.5-1.5% of zinc oxide, 0.1-1% of magnesium oxide, 1.0-7% of boric acid, 5.0-27% of resin, 2.0-6.0% of organic solvent, 0.1-0.8% of other auxiliaries, and the balance of water. The paint is an environment-friendly paint free from chromium; at the same time, the coating is uniform in brightness, better in corrosion resistance than the ordinary phosphate coating, and good in insulation, adhesiveness, punching, weldability, heat resistance and corrosion resistance. In addition, the source of the semi-inorganic environment-friendly insulating paint for the non-oriented silicon steel is rich, so that the production cost is low, and the paint can be widely applied.

Description

[0001] technical field [0002] The invention belongs to the technical field of silicon steel coatings, and in particular relates to an environmentally friendly insulating coating for non-oriented silicon steel and a preparation method of the coating. Background technique [0003] Electrical steel is a ferrosilicon soft magnetic alloy with extremely low carbon content, which is mainly used in the manufacture of motors, generators, transformer cores and various telecommunications equipment. At present, electrical steel coatings are divided into three categories: all-inorganic coatings, semi-inorganic coatings and organic coatings. The general development trend is: all organic coatings are gradually eliminated, and inorganic coatings will gradually replace semi-inorganic coatings. However, due to the nature of the inorganic coating itself and the constraints of various conditions, at present, the international electrical steel manufacturers usually use more semi-inorganic coa...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the appeal, to provide a high temperature resistant cold-rolled non-oriented silicon steel insulation coating and coating preparation method thereof, the coating does not contain chromate harmful to the human body and the environment, and to ensure better In the case of interlayer resistivity, the content of free phosphate is reduced, and the problem of poor corrosion resistance of the coating is solved by its interaction with boric acid and water-based epoxy resin