A kind of high thermal conductivity corrosion-resistant electrical steel self-adhesive coating and preparation method

Abstract

The invention discloses a high thermal conductivity corrosion-resistant electrical steel self-adhesive coating and a preparation method. The self-adhesive coating of the invention comprises the following components in mass percentage: 25% to 35% of bisphenol A epoxy resin, phenolic aldehyde Epoxy resin 4% to 8%, isooctyl phosphate 0.2% to 0.5%, propylene glycol methyl ether 5% to 10%, emulsifier 5% to 8%, dimethylaminoethoxy trioxaborate ring 1 % to 3%, ammonium blocked Lewis acid salt 0.5% to 2%, boron nitride fiber 3% to 12%, alumina fiber 0.4% to 1.0%, grinding aid 0.2% to 0.3%, and the balance is pure water. The activated self-adhesive coating formed after the first curing of the self-adhesive coating significantly improves the corrosion resistance of the electrical steel substrate. The self-adhesive coating has good thermal conductivity, and the first curing and the second hot pressing The difficulty of operating process conditions is significantly reduced. The preparation method of the self-adhesive coating of the invention is simple to operate and has high implementation feasibility.

Description

technical field [0001] The invention relates to the technical field of metal surface insulating coatings, in particular to a self-adhesive coating for high thermal conductivity and corrosion-resistant electrical steel and a preparation method. Background technique [0002] Electrical steel sheet, also known as silicon steel sheet, is mainly used for various motor magnetic cores. In the existing motor manufacturing process, after the electrical steel is punched and laminated, it is usually fastened into the motor iron core by welding, bolting or riveting, but the above connection methods may have the following problems: (1) During welding Or riveting will lead to the deterioration of the magnetic properties of the iron core, which will affect the operating efficiency of the motor; (2) Only a part of the iron core is fastened, which is easy to generate noise during magnetization resonance; (3) The iron core is only partially fixed and cannot be applied to Working conditions w...

AI Technical Summary

Problems solved by technology

In the existing motor manufacturing process, the electrical steel is usually welded, bolted or riveted to fasten the motor core after being punched and laminated, but the above connection methods may have the following problems: (1) Or the riveting will lead to the deterioration of the magnetic performance of the iron core, which will affect the operating efficiency of the motor; (2) only a part of the iron core is fastened, and it is easy to generate noise during magnetization resonance; (3) only part of the iron core is fixed, which cannot be applied to It is not suitable for micro motors in the working conditions with high fastening requirements

[0011] 1. In the activated state (semi-cured state) after primary curing, the corrosion resistance of the coating is poor; under the damp heat test conditions (50°C, 95% relative humidity, 72 hours), the corrosion area reaches more than 20%;

[0012] 2. The thermal conductivity of the all-organic coating or the self-adhesive coating doped with inorganic nano-powder is relatively low. After the laminated iron core of the motor is made, the heat dissipation of the iron core will be reduced due to the poor thermal conductivity of the coating. Poor condition, which limits the application of self-adhesive coatings to some extent;

[0013] 3. Most of the curing agents of existing self-adhesive coatings use dicyandiamide, and there are also a small amount of systems with imidazole, amino resin or isocyanate. Because dicyandiamide needs a higher temperature (above 150°C) to cure epoxy resin in the system ), it is difficult to control once curing (semi-cured state) in production

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