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Coating solution for forming insulating film, method for forming insulating film of non-oriented electrical steel sheet and non-oriented electrical steel sheet by using it

A technology of insulating film and coating, which is applied in the coating process and coating of metal materials, can solve the problems of gloss reduction and compatibility reduction, and achieve the effect of excellent compatibility

Active Publication Date: 2010-12-08
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of adding synthetic resins, the insulation performance is improved, but the compatibility with inorganic components such as phosphate, etc. is reduced
In particular, non-oriented electrical steel sheets coated with a thick film have a problem in that the glossiness drops sharply

Method used

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  • Coating solution for forming insulating film, method for forming insulating film of non-oriented electrical steel sheet and non-oriented electrical steel sheet by using it
  • Coating solution for forming insulating film, method for forming insulating film of non-oriented electrical steel sheet and non-oriented electrical steel sheet by using it
  • Coating solution for forming insulating film, method for forming insulating film of non-oriented electrical steel sheet and non-oriented electrical steel sheet by using it

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Embodiment Construction

[0015] One aspect of the present invention provides a coating composition for forming an insulating film with excellent compatibility and surface gloss. Based on 100 g of a mixed solution of aluminum dihydrogen phosphate and zinc dihydrogen phosphate, the composition contains 0.5 ~5g mixed solution of cobalt hydroxide and strontium hydroxide, 150~300g polyester emulsion resin, 3~10g aluminum silicate and 0.5-6.0g chelating agent, wherein the polyester emulsion resin has a weight average molecular weight of 2,000~15,000 , 15-25% solid content and 100-500cp viscosity.

[0016] The phosphate may have a solid content of 55-60% by weight and a viscosity of 30-70 cp.

[0017] The mixed solution of cobalt hydroxide and strontium hydroxide may have a solid content of 55˜60% by weight based on the total weight of the phosphate.

[0018] The polyester emulsion resin may have a glass transition temperature (Tg) of 40˜50° C. and an acidity (pH) of 4˜5.

[0019] The chelating agent can b...

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Abstract

Disclosed is a coating composition having superior compatibility and surface gloss for forming an insulating film and a method of forming the film. The coating composition includes, based on 100 g of a mixture solution of monoaluminum phosphate and monozinc phosphate, 0.5-5 g of a mixture solution of cobalt hydroxide and strontium hydroxide, 150-300 g of a polyester emulsion resin, 3-10 g of aluminum silicate, and 0.5-6.0 g of a chelating agent, in which the polyester emulsion resin has a weight average molecular weight of 2,000-15,000, a solid content of 15-25% and a viscosity of 100-500 cp. Even when the coating composition which is chromium-free is applied in the form of a thick film on a non-oriented electrical steel sheet, superior insulating properties, corrosion resistance, film adhesion, compatibility and surface gloss can be exhibited.

Description

technical field [0001] The present invention relates to a coating composition for forming an insulating film and a method for forming an insulating film of a non-oriented electrical steel sheet. Specifically, the present invention relates to a coating composition for forming a film of a non-oriented electrical steel sheet, which composition does not contain chromium (Cr) and exhibits excellent component compatibility, and is useful in producing a non-oriented electrical steel sheet having a thick film. Extremely high surface gloss during steel sheeting, excellent corrosion resistance, and high film adhesion after stress relief annealing (SRA), and relates to a method of forming the film. Background technique [0002] In recent years, non-oriented electrical steel sheets have been produced with high quality due to their improved magnetic properties and are used in large wind or steam generators. Accordingly, there is an increasing demand for high insulation performance betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/00
CPCC23C22/74C09D5/084C23C22/20C22C38/02C23C22/07C23C22/76C23C22/77
Inventor 韩敏洙金正雨韩赞熙朴顺福金在宽
Owner 浦项股份有限公司
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