A kind of preparation method of environment-friendly semi-organic insulating coating for high silicon steel

Abstract

The invention discloses a preparation method of an environment-friendly semi-organic insulating coating for high silicon steel, belonging to the technical field of preparation of silicon steel insulating coatings. The method comprises the steps of pre-treating the surface of high silicon steel before coating, and then preparing an environment-friendly semi-organic insulating coating solution for high silicon steel, wherein the coating solution comprises the following components in percentage by mass based on the total mass: 10-15% of styrene-acrylic emulsion, 20-30% of aluminum dihydrogen phosphate solution, 2-3% of glycerin and the balance of deionized water; and finally coating the pre-treated surface of the high silicon steel with the insulating coating solution while controlling the coating quantity to be 0.8-1.2g / m<2>, and curing and sintering at 200-300 DEG C for 0.5-1 minute to obtain the insulating coating. The semi-organic insulating coating is suitable for the high silicon steel (iron-silicon alloy containing 4.5-6.7% of Si), does not contain heavy metal elements such as chromium, is safe and environment-friendly, has good adhesiveness, insulating property, corrosion resistance, heat resistance and punching performance, and can meet relevant performance requirement of the high silicon steel.

Description

technical field [0001] The invention relates to a method for preparing an environment-friendly semi-organic insulating coating for high-silicon steel, and belongs to the technical field of preparing insulating coatings for silicon steel. technical background [0002] High-silicon steel (iron-silicon alloy containing 4.5% to 6.7% Si) has higher resistivity, smaller magnetostriction coefficient and lower iron loss than 3% ordinary silicon steel, and has excellent soft magnetic properties at higher frequencies. It has broad application prospects in fields such as energy saving and noise reduction. In order to reduce the eddy current loss between high-silicon steel laminations, it is necessary to coat an insulating film on the surface of the steel sheets. At present, there are three main types of insulating coatings on the surface of non-oriented silicon steel: inorganic coatings, organic coatings, and semi-organic coatings. For high-silicon steel with high silicon content, hi...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a chromium-free environmental protection semi-organic insulating coating for high silicon steel, which solves the environmental pollution problem caused by chromium, and at the same time ensures that the coating has good adhesion, insulation, corrosion resistance, Thermal properties and punching performance can meet the performance requirements of high-silicon steel, and a method of surface pretreatment before coating high-silicon steel insulating coating is proposed. When the treated high-silicon steel is coated with semi-organic insulating coating, the coating adhesion it is good

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