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Chrome-free insulating paint and application thereof

An insulating coating and solution technology, which is used in epoxy resin coatings, coatings, devices for coating liquids on surfaces, etc. problem, to achieve the effect of easy promotion, simple method and low cost

Active Publication Date: 2013-05-29
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, 28-98 parts of acrylic acid-styrene emulsion, 6-18 parts of zinc nitrate, 4-13 parts of silicon compounds, 18-35g of ethylene glycol, and 3-11g of non-ionic 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, their corrosion resistance is affected; US Patent 5955201 uses inorganic silicate particles as residual phosphoric acid. Stabilizer, although effectively avoiding the problem of stickiness, but the inorganic silicate particles are immiscible with the solution system, and it is easy to produce precipitation, and its effect is difficult to reflect when the stirring is uneven; PCT patent application WO2008 / 016220A1 uses hydrogen Cobalt oxide and strontium hydroxide are used as stabilizers for residual phosphoric acid, which can also avoid sticking problems, but both are inorganic particles, which are difficult to mix evenly
In general, the existing phosphate insulating coatings cannot completely replace chromium-containing insulating coatings

Method used

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  • Chrome-free insulating paint and application thereof
  • Chrome-free insulating paint and application thereof
  • Chrome-free insulating paint and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The formulation of non-oriented silicon steel chromium-free insulating coating composed of aluminum dihydrogen phosphate, ethylene glycol, acrylic-styrene copolymer resin, metal organic acid salt and water is shown in Table 1. The formula coating is stirred at a low speed by a magnetic stirring device for 10 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 to bake the 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.

[0048] 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 .

[0049] Corrosion resistance test: JIS Z2371 (salt spray test method, Methods of Salt Spray...

Embodiment 2

[0059] The formulation of chromium-free insulating coating for non-oriented silicon steel composed of aluminum dihydrogen phosphate, polyvinyl acetate, metal organic acid salt, nickel acetate 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 to bake the film at a plate temperature of 200-500°C. The coating performance results are shown in Table 4. The test conditions are as follows:

[0060] 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.

[0061] Sticky surface: Touch the surface with your hands to judge whether there is a sticky feeling.

[0062] All the other test conditions are th...

Embodiment 3

[0069] See Table 5 for the formula of non-oriented silicon steel chrome-free insulating coating composed of magnesium dihydrogen phosphate, styrene-acrylic acid copolymer resin, metal organic acid salt, 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 to bake the 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.

[0070] table 5

[0071]

[0072] Table 6

[0073]

[0074] It can be seen from Table 6 that the addition of a small amount of ethylene glycol will not affect the performance of the coating, but when the addition exceeds 40 parts by mass, the weldability and corrosion resistance will decreas...

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PUM

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Abstract

The invention discloses a chrome-free insulating paint. The paint comprises the following components in parts by mass: 100 parts of metallic dihydric phosphate, 10 to 100 parts of resin which is selected from one or more of polyvinyl acetate, polyacrylate, styrene-crylic acid copolymer resin and epoxy resin, 1 to 40 parts of soluble metallic organic acid salt which is selected from one or more oflactate, acetate, gluconate and citric acid, 110 to 10,000 parts of water, and less than or equal to 40 parts of optional organic solvent. By the implementation of the paint, the chrome-free insulating coat with excellent performance can be obtained so as to realize replacement on a chrome-containing coating, and fulfill the requirement of environmental protection. The chrome-free insulating paint can be used in non-oriented silicon steel.

Description

technical field [0001] The invention relates to an insulating coating, in particular to an environmentally friendly insulating coating which does not contain chromium and can be used for non-oriented silicon steel. Background technique [0002] The non-oriented silicon steel sheets used in medium or large motors and transformers should have a layer of insulating coating to provide a high level of interlayer resistance, so that the eddy current loss of the stator is minimized after the silicon steel sheets are stacked into stator materials. 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 restr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D131/04C09D133/08C09D125/08C09D163/00C09D5/25C09D7/12B05D7/16
Inventor 许云鹏陈晓吉亚明谢世殊黄昌国陈凌云
Owner BAOSHAN IRON & STEEL CO LTD