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Strong-pressure resisting water-based insulting paint for electric steel and preparation method thereof

An insulating coating, electrical steel technology, applied in polyester coatings, epoxy resin coatings, coatings, etc., can solve the problem of poor adhesion of coatings and steel sheets, uneven brown appearance, poor corrosion resistance of coatings, etc. problems, to achieve the effects of excellent insulation and anti-rust performance, high creep resistance and strong adhesion

Inactive Publication Date: 2010-08-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at such a high curing temperature, the resin will degrade, produce an uneven brown appearance, and make the adhesion of the coating and the steel sheet worse; US4618377, US3793073, US4844753 and other patents contain chromic acid or chromate Compounds will cause safety and environmental problems. If these compounds harmful to human body are not added to the components, the coating formed on the surface of the steel plate will have poor corrosion resistance
In addition, when the above-mentioned insulating coatings are used for large-scale generators, motor units and transformers above 1 million kilowatts, it is difficult to apply uniform coating on the entire width of the steel sheet and the coating will creep under strong pressure.

Method used

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  • Strong-pressure resisting water-based insulting paint for electric steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-pressure resistant water-based insulating coating for electrical steel and a preparation method thereof. 10-15wt% water-based acrylic modified epoxy resin, 2-5wt% methanol-etherified melamine formaldehyde resin, 55-60wt% pigment, 8-10wt% additive, 0.1-0.2wt% p-toluene The sulfonic acid, 4-5wt% of anthranilic acid and 5-10wt% of deionized water are mixed, ground in a sand mill until the fineness is below 15 microns, and then packed.

[0029] Among the pigments: 35-40wt% of group A, 10-15wt% of group B, 5-10wt% of group C and 1-5wt% of group D;

[0030] The auxiliary agent is a mixture of wetting and dispersing agent, defoaming agent, leveling agent, coupling agent, thickener, preservative and pH regulator.

Embodiment 2

[0032] A high-pressure resistant water-based insulating coating for electrical steel and a preparation method thereof. 15-20wt% water-based acrylic modified alkyd resin, 5-10wt% ethanol-etherified melamine formaldehyde resin, 53-56wt% pigment, 4-8wt% additive, 0.2-0.3wt% p-toluene The sulfonic acid, 4-5wt% of anthranilic acid and 10-15wt% of deionized water are mixed, ground in a sand mill until the fineness is below 15 microns, and then packed.

[0033] Among the pigments: 35-45wt% of group A, 5-10wt% of group B, 5-10wt% of group C and 1-5wt% of group D;

[0034] The auxiliary agent is a mixture of wetting and dispersing agent, leveling agent, coupling agent, thickener, preservative and pH regulator.

Embodiment 3

[0036] A high-pressure resistant water-based insulating coating for electrical steel and a preparation method thereof. 18-22wt% water-based acrylic modified resin, 2-5wt% propanol etherified melamine formaldehyde resin, 40-45wt% pigment, 5-7wt% additive, 0.3-0.4wt% p-toluenesulfonate acid, 2-3wt% m-aminobenzoic acid and 25-30wt% deionized water are mixed, ground in a sand mill until the fineness is below 15 microns, and then packed.

[0037] Described water-based acrylic modified resin is the mixture of water-based acrylic modified epoxy resin and water-based acrylic modified alkyd resin;

[0038] Among the pigments: 30-35wt% of group A, 5-10wt% of group B and 5-10wt% of group C;

[0039] The auxiliary agent is a mixture of wetting and dispersing agent, defoamer, thickener, preservative and pH regulator.

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Abstract

The invention relates to a strong-pressure resisting water-based insulting paint for electric steel and a preparation method thereof. The strong-pressure resisting water-based insulting paint can be prepared by the following steps of: mixing 10-40 percent by weight of water-borne acrylic resin, 2-20 percent by weight of water-borne amine resin, 30-60 percent by weight of pigment, 0-10 percent by weight of addition agent, 0.1-5 percent by weight of catalyst, 0-5 percent by weight of corrosion inhibitor and 1-30 percent by weight of deionized water; and grinding the mixture in a sand mill until the fineness is below 15 micrometers and packaging. The components have no chromate and toxic and harmful ingredients, so that the strong-pressure resisting water-based insulting paint is environment-friendly; the prepared paint is coated on the surface of the electric steel and forms a protective layer with strong adhesion performance after being subjected to high-temperature braking and curing; and the protective layer has the advantages of very high surface resistivity, excellent corrosion resistance and very high strong pressure resistance and creep resistance.

Description

technical field [0001] The invention belongs to the technical field of water-based insulating coatings. In particular, it relates to a strong pressure-resistant water-based insulating coating for electrical steel and a preparation method thereof. Background technique [0002] The surface of the electrical steel sheets used in large generators, motor units and transformers above 1 million kilowatts must have a layer of insulating coating to provide a high level of surface resistivity, so that the laminations formed by the electrical steel sheets can be separated between layers during use. Power loss is minimized. In particular, there are many superimposed steel sheets, which require the coating to have strong resistance to strong pressure and creep resistance. At present, there are three main types of insulating coatings for electrical steel sheets: inorganic insulating coatings, organic insulating coatings, and organic-inorganic insulating coatings. [0003] Inorganic ins...

Claims

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Application Information

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IPC IPC(8): C09D163/10C09D167/08C09D161/32C09D5/25
Inventor 段辉
Owner WUHAN UNIV OF SCI & TECH
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