Environmental-protection oriented silicon steel insulation layer

A technology of oriented silicon steel and insulating coating, applied in coatings, epoxy coatings, etc., can solve the problems of chromium poisoning, moisture absorption and stickiness of phosphate coatings, etc.

Active Publication Date: 2007-06-13
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The system with titanate as the main agent in the present invention not only solves the problem of poisoning caused by chromium, but also avoids the problem of moisture absorption and stickiness of phosphate coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The examples in Table 1 use alkali metal titanates.

[0023] Table 1

[0024] Composition (mass percentage)

[0025] Note: In the above examples, the coated boards did not absorb moisture in a humid environment.

[0026] Table 2 gives examples of alkaline earth metal titanates.

[0027] Table 2

[0028] Composition (mass percentage)

[0029] Note: In the above examples, the coated boards did not absorb moisture in a humid environment.

[0030] Table 3 gives examples of other titanates

[0031] table 3

[0032] Composition (mass percentage)

[0033] Note: In the above examples, the coated boards did not absorb moisture in a humid environment.

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PUM

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Abstract

The aqueous suspension of inorganic titanates containing meta titanates (M(II)TiO3), normal titanates (M(II)2TiO4) and mixed titanates (M(I)2Ti2O5), is an important components of the coating in this invention. The M stands for metals such as Potassium, Lithium and Sodium, the alkaline-earth metals such as Barium, Strontium, Magnesium and Calcium, as well as Zinc, Iron and Aluminium. The said aqueous suspension of inorganic titanates accounts 17.2-28.2% of the total weight ,the boric acid 0.17-13.9% and the ethylene oxide-propylene oxide copolymers 0.012-0.115%; the fillings such as Silicon dioxide, alumina and mica account for 0-20% and the rest is water. As an environment protective coating, it can be used to coat on the surface of the oriented silicon steel products. They contain no Chromium that does harm to environment and children, can be applied to products with demand of high security such as child toys and exported to the European Union and. Besides, this coating has no problem of moisture absorption and pastiness.

Description

technical field [0001] The invention relates to an insulating coating for oriented silicon steel, in particular to an environment-friendly insulating coating. Background technique [0002] There is an insulating coating on the surface of grain-oriented silicon steel. Its function is to provide surface insulation and apply tensile stress to the steel plate to improve magnetic properties. [0003] Most of the insulating coatings now contain chromium. For example, in 1973, the insulating coating of Kawasaki Iron and Steel Co., Ltd. in Japan contained chromic acid to improve interlayer resistance and moisture absorption resistance. [0004] Japanese Laid-Open Patent Publication No. 48-39338 discloses an insulating coating capable of applying stress to steel plates, wherein 0.2 to 4.5% chromic acid is added to improve the wettability of the coating solution and to stabilize the free phosphoric acid in the phosphate. [0005] Chromic acid is a substance harmful to the environment...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/25
Inventor 黄昌国路林林沈侃毅
Owner BAOSHAN IRON & STEEL CO LTD
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