A kind of environment-friendly self-adhesive coating for electrical steel and preparation method thereof

Abstract

The invention discloses an environment-friendly self-adhesive coating for electrical steel and a preparation method thereof, belonging to the field of metal surface coatings. The preparation process of the self-adhesive paint of the present invention is as follows: 15% to 50% of water-soluble acrylic resin, 1% to 10% of dicyandiamide, 0.5% to 6% of ethylene glycol phenyl ether, and 1.5% of inorganic filler are sequentially added to pure water. %~13%, 0.5%~2.5% of dimethylethanolamine, 0.1%~0.8% of wetting and dispersing agent, 0.1%~0.3% of acetylenic glycol surfactant, stirring for 5~30min; particle size D 50 0.5 to 1.5 microns; add 30% to 70% of water-based epoxy resin to the ground slurry under stirring, stir for 10 to 60 minutes, and discharge through a sieve to become an environmentally friendly self-adhesive coating. The coating is green and environmentally friendly, has good storage stability, and when it is cured under heat and pressure, the coating will not be deformed by compression to cause the coating to be extruded.

Description

technical field [0001] The invention relates to the technical field of metal surface coatings, in particular to an environment-friendly self-adhesive coating for electrical steel and a preparation method thereof. Background technique [0002] Electrical steel sheets, also known as silicon steel sheets, are mainly used in various motor cores. Generally, electrical steel sheets are coated with an insulating coating on their surface, and then they are sequentially stamped into a predetermined shape, stacked, and connected together by welding, locking, riveting, etc. to form a magnetic core. Most electrical steel sheets are assembled into iron cores by welding, bolting, self-fastening or riveting, but the fixing method of these iron cores is the local "point" fixing method of the chip, and its connection force is not high, which is difficult to meet the fastening requirements. A core with high strength requirements. In addition, welding and riveting methods are not suitable fo...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the disadvantages of poor comprehensive performance, uneasy control of curing degree and high content of volatile organic solvents in the prior art of electrical steel adhesive coatings, and to provide an environmentally friendly self-adhesive coating for electrical steel and its preparation method , the present invention adopts acrylic resin and epoxy resin as the main film-forming agent, and uses sodium aluminum silicate and fumed silica as auxiliary film-forming agents to provide an inorganic skeleton, so that the extrusion resistance of the coating is improved, and its impact resistance Good performance, high insulation, excellent water resistance, and the content of volatile organic solvents in the coating is extremely low, which is an environmentally friendly coating