Chromium-free semi-organic insulating paint for electrical steel and coating method thereof
A technology of insulating coatings and electrical steels, applied in polyester coatings, coatings, and devices for coating liquid on the surface, etc., can solve problems such as easy powder falling off, high coating cost, poor weldability, etc., and achieve easy spreading Leveling, complete coating and beautiful appearance
Active Publication Date: 2011-10-19
MAANSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0004] However, due to problems such as heat resistance, poor weldability, easy powder falling off, and high coating cost in the use of chromium-free environmental protection coatings, the downstream market still has not fully accepted chromium-free environmental protection coatings.
Method used
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[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0013] Table 1 shows the contents by weight of the coating components (excluding water) in Examples 1-15 and Comparative Examples 1-2 of the semi-organic electrical steel insulation coating with good overall performance and no chromium according to the present invention. Adding water to the paint and dissolving it to the required concentration of common electric steel insulating paint can be used for production.
[0014] The content of each component of coating in the embodiment and comparative example of table 1
[0015]
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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...
Claims
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Login to View More IPC IPC(8): C09D167/00C09D7/12C09D5/25B05D7/24
Inventor 孙致平王立涛朱涛董梅张建平丰慧裴陈新沈新玉占云高
Owner MAANSHAN IRON & STEEL CO LTD
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