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

Abstract

The invention relates to an environment-friendly insulating coating for cold-rolled non-oriented silicon steel and a preparation method thereof. The components of the insulating coating include: phosphate, molybdate, water, organic resin, silane coupling agent, and glycerol; the above-mentioned The weight ratio of each component is: phosphate 100, molybdate 3-20, water 800-1500, organic resin 20-50, silane coupling agent 0.5-5, glycerol 8-15. The steps of the coating preparation method are: (1) coating insulating paint on the surface of cold-rolled non-oriented silicon steel; (2) baking and drying, the baking temperature is 150-300 ° C; 600°C, the sintering time is 30-90 seconds; (4) Finished product. The insulating paint of the invention does not contain harmful elements, and the coating has good insulating performance, good adhesion and corrosion resistance, good punching and shearing processability and weldability, and can withstand heat resistance of stress-relieving annealing. The method of the invention is simple to operate, and the coating prepared by the method has good punching and shearing processability and weldability, and can withstand heat resistance of stress-relieving 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.