High-temperature-resistant environmentally-friendly insulating coating material for electrical steels, and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant environmentally-friendly insulating coating material for electrical steels, and a preparation method thereof, wherein the raw materials comprise,by mass, 15-25% of aluminum dihydrogen phosphate, 0.5-4% of boric acid, 0.5-5% of ethylene glycol antimony, 1-10% of wax emulsion, 0.1-3% of an organosilicon waterproof agent, and the balance of deionized water. The preparation method comprises: (1) sequentially adding water, boric acid, aluminum dihydrogen phosphate and ethylene glycol antimony to a reaction kettle, mixing, stirring, and dissolving uniformly; (2) after cooling to a room temperature, pouring wax emulsion into the reaction kettle according to a metering ratio, and stirring; and (3) pouring an organosilicon waterproof agent intothe reaction kettle according to a metering ratio under stirring, stirring, screening with a 1000 mesh sieve mesh, and discharging the material. According to the present invention, the coating material has advantages of good insulation performance, good corrosion resistance, and good tolerance to high temperature annealing and welding process, and cannot produce cracking, powder falling, sheddingand other failure phenomena at a high temperature.

Description

technical field [0001] The invention relates to a coating, in particular to a high-temperature-resistant and environment-friendly insulating coating for electrical steel and a preparation method thereof. Background technique [0002] Silicon steel insulating coatings can be divided into three categories: organic coatings, inorganic coatings and organic-inorganic composite (semi-inorganic) coatings. Organic coatings rely on polymers to provide insulation, and their interlayer resistance is high. They are mainly used in large and medium-sized equipment such as power plant generators. Organic coatings generally have good adhesion and punching and shearing properties, but their hardness is low, thermal stability is poor, thermal shrinkage deformation is large, pores are prone to occur during welding, and they cannot withstand stress relief annealing. The main components of inorganic coatings are generally metal salts and metal oxides, which have the advantages of high surface h...

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Problems solved by technology

[0009] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a kind of high-temperature-resistant environment-friendly insulating coating for electrical steel and its preparation method, to solve the problem that the existing chrome-free insulating coating usually has certain pollution to the environment, and The coating has low hardness and is easy to scratch. It also solves the problems that the existing coating materials have poor resistance to high-temperature annealing, and the coating is prone to cracking, powder falling, and detachment, and improves the mechanical properties of the coating material. increase density