Chromium-free insulating coating, electrical sheet material and preparation method thereof

A technology for insulating coatings and electrical steel, applied in the direction of epoxy resin coatings, coatings, and devices for coating liquid on the surface, etc., can solve problems such as poor performance, achieve excellent heat resistance, reduce curing temperature, and optimize process flow Effect

Inactive Publication Date: 2012-05-30
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the defect that the chromium-free insulating coating used in the existing electrical steel has poor performance after curing at a lower curing temperature, the present invention provides a chromi

Method used

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  • Chromium-free insulating coating, electrical sheet material and preparation method thereof

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Example Embodiment

[0036] According to the method for preparing the above-mentioned electrical steel material provided by the present invention, the electrical steel material includes an electrical steel substrate and a coating attached to the electrical steel substrate, and the coating is a cured product of the aforementioned chromium-free insulating coating. The method includes: curing the chromium-free insulating coating on the electrical steel substrate, and the curing temperature is not higher than 250°C.

[0037] According to the method for preparing the above-mentioned electrical steel material provided by the present invention, in order to make the coating reach the above-mentioned thickness, the amount of the chromium-free insulating coating is 1.0-3.0 grams per square meter of the electrical steel substrate surface, preferably It is 1.5-2.5 grams.

[0038] According to the method for preparing the above-mentioned electrical steel material provided by the present invention, the chromium-free...

Example Embodiment

[0047] Example 1

[0048] Under stirring conditions, add 20kg of deionized water and 42kg of styrene-acrylic emulsion (purchased from Nantong Shengda, brand SD588, with a solid content of 48% by weight and a viscosity of 500-1500mPa·s) to a 500L reactor under stirring conditions. , The particle size is 50-80nm), 33kg aluminum dihydrogen phosphate and 5kg silica sol (the particle size is 20-30nm, with SiO 2 In total, the concentration is 30% by weight). After stirring for 30 minutes, a uniform and stable dispersion system is obtained, which is the chromium-free insulating coating P1 of the present invention.

[0049] Clean cold-rolled non-oriented electrical steel strip (50PW800 produced by Panzhihua Iron and Steel Group Co., Ltd.) with alkaline degreasing cleaning solution at 55°C. The alkaline degreasing cleaning liquid is a PA50-A1 degreasing liquid with a concentration of 15% by weight, and the amount of alkaline degreasing cleaning liquid per square meter of steel strip is 30Kg...

Example Embodiment

[0051] Example 2

[0052] Under stirring conditions, add 10Kg of deionized water and 69Kg of styrene-acrylic emulsion (purchased from Nantong Shengda, brand SD800, with a solid content of 48% by weight and a viscosity of 500-1500mPa·s) to a 500L reactor under stirring conditions ), 20Kg calcium dihydrogen phosphate and 7Kg water glass (modulus is 2.5, with SiO 2 In total, the concentration is 30% by weight). After stirring for 30 minutes, a uniform and stable dispersion system is obtained, which is the chromium-free insulating coating P2 of the present invention.

[0053] Clean cold-rolled non-oriented electrical steel strip (50PW800 produced by Panzhihua Iron and Steel Group Co., Ltd.) with alkaline degreasing cleaning solution at 55°C. The alkaline degreasing cleaning solution is PA50-A1 degreasing solution with a concentration of 15% by weight, and the amount of alkaline degreasing cleaning solution per square meter of steel strip is 30Kg. Then rinse with a rinsing liquid, whic...

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Abstract

The invention provides a chromium-free insulating coating which has better performance after being cured at a lower temperature, an electrical sheet material containing a coating obtained by curing the chromium-free insulating coating and a preparation method thereof. The chromium-free insulating coating is obtained by uniformly mixing a raw material mixture and is characterized in that the raw material mixture comprises a film forming material, dihydric phosphate, an inorganic filler and a solvent. The preparation method of the electrical sheet material comprises the following steps of: adhering the chromium-free insulating coating to an electrical sheet substrate and then curing the chromium-free insulating coating, wherein the curing temperature is not higher than 250 DEG C. The chromium-free insulating coating provided by the invention can be cured at a temperature of 200-250 DEG C, so that the chromium-free insulating coating can be cured by simpler curing equipment, thus the equipment investment is greatly saved, the process flow is easy to further plan and optimize, the equipment utilization rate and the production efficiency of a whole production line are improved, and the energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to a chromium-free insulating paint, an electrical steel material and a preparation method of the electrical steel material. Background technique [0002] Electrical steel is mainly used as core material for electric motors and transformers. In order to reduce eddy current loss, it is necessary to attach an insulating coating to the surface of the steel plate. [0003] At present, most of the electrical steel coatings at home and abroad are insulating coatings containing chromium. Chromium is an element harmful to the human body and the environment. As the world pays more and more attention to environmental protection, its use is strictly restricted. [0004] In order to meet the requirements of environmental protection, especially to meet the requirements of the RoHS directive that must be met by the home appliance manufacturing industry, environmental protection insulating coatings for electrical steel are also being developed ...

Claims

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Application Information

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IPC IPC(8): C09D125/14C09D163/00C09D133/04C09D7/12C09D5/25B05D7/14B05D3/02B05D3/10
Inventor 郭太雄董学强刘春富徐权刘建华薛世清袁萍王平利许哲峰尹曦
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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