Electric steel insulating paint with high comprehensive performance

Abstract

The invention provides an electric steel insulating paint with a high comprehensive performance. The electric steel insulating paint is characterized by comprising the following components in percentage by weight: 1 to 40 percent of hexavalent chromic salt, 0.01 to 10 percent of calcium salt, 0.5 to 35 percent of magnesium salt, 0.2 to 20 percent of borate, 0.05 to 15 percent of phosphate, 0.05 to 10 percent of silicon dioxide, 0.5 to 40 percent of organic resin emulsion, 0.5 to 15 percent of polyhydric alcohol, 0.05 to 1 percent of polyether modified polydimethyl siloxane and 0.03 to 3 percent of paint additive. A coating layer employing the electric steel insulating paint has the high comprehensive performance.

Description

technical field [0001] The invention relates to an insulating coating for non-oriented electrical steel, in particular to a semi-organic insulating coating with good comprehensive performance for cold-rolled non-oriented electrical steel. Background technique [0002] Non-oriented electrical steel is widely used as core material for electric motors and transformers. In order to prevent the short circuit between the iron core laminations and increase the eddy current loss, it is necessary to coat the surface of the cold-rolled non-oriented electrical steel sheet with an insulating coating. When manufacturing motor and transformer iron cores, it is necessary to punch electrical steel sheets into core-shaped blanks, and to fix the edges of the laminations and adapt to the working conditions of different types of iron cores, so the non-oriented electrical steel insulation coating Not only good insulation, but also good punching, adhesion, weldability, heat resistance, corrosion...

AI Technical Summary

Problems solved by technology

At present, the most widely used electrical steel insulating coatings are semi-organic coatings. However, some semi-organic coatings have poor adhesion to electrical steel substrates, and the coating will fall off during punching, and the peeling off is more serious after stress-relieving annealing; some The coating can cause blistering of the weld when welding; some coatings do not provide enough corrosion resistance for electrical steel substrates, resulting in corrosion on the surface of the steel plate, etc.