Chromium-free semi-organic insulating paint for electrical steel and coating method thereof

Abstract

The present invention discloses a chromium-free semi-organic insulating paint, which includes the following components: 35-55 parts of water-soluble saturated polyester resin, 8-15 parts of full-methylated melamine resin, 3-10 parts of modified aluminium tripolyphosphate, 1-6 parts of zinc calcium phytate, 7-12 parts of zinc phosphate, 5-9 parts of mica powder, 10-16 parts of titanium dioxide, 4-8 parts of kaolin, 0.5-1.5 parts of dimethylethanolamine, 2-8 parts of ethylene glycol butyl ether, 0.2-1.0 part of ammonium polyacrylate, 0.1-0.5 part of polyether-modified siloxane and 0.1-0.3 part of an organic silicon defoamer. The coating made of the paint disclosed by the invention has the advantages of good insulativity, adhesiveness, heat resistance, stamping capability and weldability, no defects of streak, bubble, color difference and other defects, and long storage life.

Description

technical field

[0001] The invention relates to a semi-organic insulating coating for electrical steel sheets, in particular to a chromium-free semi-organic insulating coating. Background technique

[0002] Non-oriented electrical steel is widely used as core material for electric motors and transformers. In order to prevent the short circuit between the iron core laminations and increase the eddy current loss, it is necessary to coat the surface of the cold-rolled non-oriented electrical steel sheet with an insulating coating. When manufacturing motor and transformer iron cores, it is necessary to punch electrical steel sheets into core-shaped blanks, and to fix the edges of the laminations and adapt to the working conditions of different types of iron cores, so the non-oriented electrical steel insulation coating Not only good insulation, but also good punching, adhesion, weldability, heat resistance, corrosion resistance, etc.

[0003] At the beginning of the last centu...

Images