Environmental friendly chromium-free insulating paint

An insulating coating and environmentally friendly technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems of affecting corrosion resistance, difficult to mix evenly, easy to produce precipitation, etc., and achieve the effect of excellent performance

Active Publication Date: 2011-06-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphate coating can provide excellent insulation performance and heat resistance, but phosphate often contains excessive residual phosphoric acid, so it is easy to cause moisture absorption and stickiness (chip stickiness), and it is necessary to add a stabilizer for residual phosphoric acid
For example, European patent EP1208166B1 uses 100 parts of aluminum dihydrogen phosphate, 28 to 98 parts of acrylic acid-styrene emulsion, 6 to 18 parts of zinc nitrate, 4 to 13 parts of silicon compounds, 18 to 35 g of ethylene glycol, and 3 to 11 g of nonionic Insulating coatings with surfactants, because there is no stabilizer for residual phosphoric acid, show water absorption and stickiness, and at the same time, due to the use of zinc nitrate,

Method used

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  • Environmental friendly chromium-free insulating paint
  • Environmental friendly chromium-free insulating paint
  • Environmental friendly chromium-free insulating paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The formula of non-oriented silicon steel chromium-free insulating coating composed of aluminum dihydrogen phosphate, ethylene glycol, acrylic-styrene copolymer resin, zirconium acetate, ethylene glycol and water is shown in Table 1. The formula coating is stirred at a low speed by a magnetic stirring device for 30 minutes at room temperature, and then coated on the surface of a non-oriented silicon steel plate with a thickness of 0.5mm by a roller coater, and the coating amount is kept at 1.8g / m 2 , using an open flame oven, baked into a film at a plate temperature of 200-500 °C. The film performance was tested according to the following conditions, and the coating performance results are shown in Table 2.

[0035] Weldability test conditions: Inert gas tungsten machine shielded welding (TIG), current value 120A, electrode material Th-W, argon gas flow rate 6L / min, pressure 50kg / cm 2 .

[0036] Corrosion resistance test: JIS Z2371 (salt spray test method, Methods of ...

Embodiment 2

[0046] The formulation of non-oriented silicon steel chromium-free insulating coating composed of aluminum dihydrogen phosphate, polyvinyl acetate, glycerol, zirconium nitrate and water is shown in Table 3. After stirring the formula coating with a magnetic stirring device for 10 minutes at room temperature, it is coated on the surface of a non-oriented silicon steel plate with a thickness of 0.5 mm by a roller coater, and the coating amount is kept at 1.8 g / m 2 , using an open flame oven, baked into a film at a plate temperature of 200-500 °C. The coating performance results are shown in Table 4. The test conditions are as follows:

[0047] P dissolution test: put the coating sample with a fixed area into the wastewater and boil for 10 minutes, then use ICP to test the P dissolved in the wastewater and convert it.

[0048] Sticky surface: Touch the surface with your hands to judge whether there is a sticky feeling.

[0049] All the other test conditions are the same as in ...

Embodiment 3

[0056] Table 5 shows the formulation of non-oriented silicon steel chromium-free insulating coating composed of magnesium dihydrogen phosphate, styrene-acrylic acid copolymer resin, zirconium chloride, ethylene glycol and water. After stirring the formula coating with a magnetic stirring device for 10 minutes at room temperature, it is coated on the surface of a non-oriented silicon steel plate with a thickness of 0.5 mm by a roller coater, and the coating amount is kept at 1.8 g / m 2 , using an open flame oven, baked into a film at a plate temperature of 200-500 °C. The coating performance results are shown in Table 6. The test conditions are the same as in Example 1.

[0057] Table 5 Unit: parts by mass

[0058] Numbering

Magnesium dihydrogen phosphate

Styrene-acrylic copolymer resin

ethylene glycol

Zirconium chloride

water

16

100

20

0

3

4000

17

100

10

10

2

3000

18

1...

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Abstract

An environmental friendly chromium-free insulating paint contains the following components: 100 parts by weight of metal dihydrogen phosphate; 10-200 parts by weight of one or more than one of vinyl acetate, acrylic acid, styrene-acrylic acid copolymer or phenolic resin; 1-40 parts by weight of one or more than one of zirconium acetate, zirconium nitrate, zirconium chloride, zirconium oxychloride, zirconium n-propoxide, and zirconium n-butoxid; and 200-500 parts by weight of pure water. The insulating coating obtained by the paint of the present invention exhibits good corrosion resistance, adhesiveness, and heat resistance; the invention successfully realizes the replacement of chromium compounds and therefore realizes the environmental protection of the production process; and the chromium-free insulating paint is applicable to non-oriented silicon steel.

Description

technical field [0001] The invention relates to an insulating coating, in particular to an environment-friendly chrome-free insulating coating which does not contain chromium and can be used for non-oriented silicon steel. Background technique [0002] The surface of the non-oriented silicon steel sheet is generally coated with an insulating coating, which should provide a high level of interlayer resistance, so that the eddy current loss of the stator is minimized after the silicon steel sheet is stacked into the stator material. The manufacturability of the silicon steel sheet requires that the insulating coating must have good adhesion to ensure that it will not fall off from the edge of the silicon steel sheet during punching. Buildup on feed rolls or other equipment wears down the dies used to stamp or shear the laminations. [0003] Traditional insulating coatings often use chromate as a component, but due to its carcinogenicity, its use is increasingly restricted in ...

Claims

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Application Information

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IPC IPC(8): C09D133/02C09D125/08C09D131/04C09D161/06C09D5/08C09D5/25
Inventor 许云鹏黄杰吉亚明黄昌国陈晓邹忠魁陈卓雷刘宝军金冰忠张仁彪
Owner BAOSHAN IRON & STEEL CO LTD
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