Environment-friendly type insulated dope for cold rolling non-oriented silicon steel and preparation method for coat thereof

Abstract

The invention relates to environmental protection type insulating coating used for cold rolling non-orientation silicon steel and the preparation method of a coating layer thereof. The components of the insulating coating comprise phosphate, molybdenate, water, organic resin, silane coupler and glycerine; the weight ratio of each component is as follows: 100 parts of phosphate, 3 to 20 parts of molybdenate, 800 to 1500 parts of water, 20 to 50 parts of organic resin, 0.5 to 5 parts of silane coupler and 8 to 15 parts of glycerine. The preparation method of the coating has the following steps:firstly, the insulating coating is coated on the surface of the cold rolling non-orientation silicon steel; secondly, baking and drying: the baking temperature is 150 to 300 DEG C; thirdly, sintering: the sintering temperature is 400 to 600 DEG C, and the sintering time is 30 to 90 seconds; fourthly, finished product. The insulating coating of the invention contains no damaging element, the coating layer of the invention has good insulating property simultaneously, the adhesivity and the corrosion resistance are good, and the insulating coating of the invention has good punching shear workability and good weldability, and can bear the heat resistance of eliminating stress annealing. The operation of the method in the invention is simple, the coating layer prepared by the method has the good punching shear workability and the good weldability, and can bear the heat resistance of eliminating the stress annealing.

Description

technical field [0001] The invention relates to an insulating paint for cold-rolled non-oriented silicon steel, in particular to an environment-friendly insulating paint for cold-rolled non-oriented silicon steel and a preparation method of the coating. Background technique [0002] Cold-rolled non-oriented silicon steel is mainly used to manufacture various types of motor cores. When the machine is running at the operating frequency, the alternating magnetic field causes eddy current losses in the iron core. The eddy current loss is proportional to the square of the thickness of each silicon steel plate in the iron core. Therefore, thinning the steel plate is the main measure to reduce the loss of the silicon steel plate. This insulating coating not only needs to have good insulation, adhesion, and corrosion resistance, but also should have good punching and shearing properties, weldability, and heat resistance that can withstand stress relief annealing. [0003] The insu...

AI Technical Summary

Problems solved by technology

[0008] Although the above-mentioned insulating coatings for non-oriented silicon steel do not contain chromate in composition, phosphate is used as an antirust treatment agent in the selection of inorganic components. Phosphate has a common feature that it is on the metal A non-dense film is formed on the surface. After the heat treatment, the organic components of the insulating film are destroyed to a certain extent, and the corrosion resistance of the insulating film is greatly reduced. The surface is sticky and reduces the performance of the insulating film

At the same time, after the above-mentioned coatings are blued and annealed for stress relief, the coatings appear powdery and fall off, which cannot meet the needs of users for subsequent treatment processes.

Images