Insulating coating liquid for improving cracks of surface coating of oriented silicon steel, preparation method for insulating coating liquid, and oriented silicon steel plate

Abstract

The invention provides an insulating coating liquid for improving the cracks of a surface coating of oriented silicon steel, a preparation method for the insulating coating liquid, and an oriented silicon steel plate. The insulating coating liquid comprises the following components in parts by weight: 100 parts by weight of phosphate solution, 2-10 parts by weight of magnesium oxide or magnesium hydroxide, 10-20 parts by weight of chromic anhydride or chromate, 2-10 parts by weight of boric acid, 10-20 parts by weight of an organic solvent, 80-200 parts by weight of silica sol, 5-20 parts by weight of zirconium sol, 6-15 parts by weight of nano zinc oxide, 2-10 parts by weight of antimony pentoxide sol and 80-120 parts of water. According to the invention, the oxide combination of zirconium oxide, zinc oxide, antimony pentoxide and the like has small particle size, high affinity with the coating liquid components, and high dispersity in a coating solution system, and the coating liquidhas high stability; and when the coating is dried to form a film, the oxide combination can neutralize the brittleness of film formation of surface silica sol, fill gap parts of the coating, improvethe stability and toughness of the film formation of the surface coating, and then integrally improve the strength and toughness of the coating, eliminate microcosmic surface cracks, and improve the magnetic performance of the oriented silicon steel.

Description

technical field [0001] The invention belongs to the technical field of silicon steel, and in particular relates to an insulating coating solution for improving surface coating cracks of oriented silicon steel, a preparation method thereof and an oriented silicon steel plate. Background technique [0002] Energy is an important material basis for the survival and development of human society. Green and clean energy is a symbol and synonym for environmental protection and a good ecosystem. The three major clean energy sources such as hydropower, wind power and nuclear power are important energy supply methods in today's society, and they are a vivid demonstration of the coordination and complementarity between environmental protection and economic development. Grain-oriented silicon steel, as the main core manufacturing material of transformers, is known as "a handicraft in steel products". [0003] Grain-oriented silicon steel is the main material of transformer iron core, w...

AI Technical Summary

Problems solved by technology

[0004] During the microscopic inspection of the surface coating of grain-oriented silicon steel, microscopic cracks often appear, and the cracks gather to form irregular linear cracks, massive holes and shedding, which not only seriously affect the magnetic properties and surface insulation of grain-oriented silicon steel. Moreover, in the later application process of punching, it will cause serious powder loss, increased surface friction coefficient and corrosion, etc., which is not conducive to the installation and construction of transformer iron core laminations, and directly causes short circuit and short circuit of the iron core of the finished transformer. Abnormal performance such as high load loss can easily cause iron core overheating, short circuit or transformer burnout in actual use

The microscopic cracks on the surface of the coating continue to accumulate and expand, resulting in quality problems such as holes, pulverization, and poor adhesion on the surface of the finished oriented silicon steel. In severe cases, the surface coating of the steel plate falls off as a whole, and the steel plate loses the protective function of the surface coating

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