Insulating paint with high punching performance for non-oriented electrical steel, and preparation method and application thereof

A technology of insulating coatings and high punching, which is applied in the direction of epoxy resin coatings, coatings, and devices for coating liquid on the surface, etc. Problems such as poor surface state of the layer can be achieved to improve the service life and product processing accuracy, improve the adhesion performance and insulation performance, and improve the ability of passivation reaction

Inactive Publication Date: 2014-02-05
SHANGHAI QIJIA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) The punching performance of the coating is not good. In the compressor manufacturing industry, there is a large gap between the punching times of the traditional organic / inorganic chromate system coating, and it is difficult to meet the punching requirements of the inverter compressor with complex shapes.
[0011] (2) The heat resistance of the coating is not good, and it is difficult to meet the annealing requirements of the non-oriented electrical steel chip process. After high-temperature annealing, the coating is seriously carbonized and easy to drop powder
[0012] (3) The surface condition of the coating is poor, the coating is uneven, the coating surface is prone to longitudinal stripes, and the coating process window is narrow
[0013] (4) The miscibility between the resin and the coating liquid is not good, and the solution is stratified after standing, which affects the uniformity of the coating process and coating performance
[0014] (5) The resin is highly volatile, irritating and not environmentally friendly

Method used

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  • Insulating paint with high punching performance for non-oriented electrical steel, and preparation method and application thereof
  • Insulating paint with high punching performance for non-oriented electrical steel, and preparation method and application thereof
  • Insulating paint with high punching performance for non-oriented electrical steel, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Example 1: Number No.1

[0123] According to the following ratio, the non-oriented electrical steel environmental protection insulating coating with high punching performance of the present invention is prepared:

[0124]

[0125] The rest is solvent water.

[0126] In this embodiment, the organic resin is one of a highly dispersible waterborne acrylic resin, a waterborne epoxy resin or a composite thereof, and preferably a waterborne acrylic-waterborne epoxy resin composite.

[0127] In this embodiment, the rare earth salt mixed solution is a solution of rare earth salt, peroxide, buffer and nitric acid, and its mixing ratio is:

[0128]

[0129] The rest is solvent water.

[0130] In this embodiment, the rare earth salt in the rare earth salt mixed solution is selected from cerium nitrate and praseodymium chloride, and its mass ratio is 3:1. The peroxide in the rare earth salt mixed solution is hydrogen peroxide and sodium peroxide, and the mass ratio of hydrogen peroxide and s...

Embodiment 2

[0155] Example 2: Number No. 2

[0156] Except for the following differences, the others are the same as in Example 1:

[0157]

[0158]

[0159] The rest is solvent water.

[0160] In this embodiment, the rare earth salt mixed solution is a solution of rare earth salt, peroxide, buffer, and nitric acid, and its mixing ratio is:

[0161]

[0162] The rest is solvent water.

[0163] In this embodiment, the rare earth salt in the rare earth salt mixed solution is selected from neodymium nitrate and praseodymium chloride, and the mass ratio is 2:1. The peroxide in the rare earth salt mixed solution is hydrogen peroxide and potassium peroxide, and the mass ratio of hydrogen peroxide and potassium peroxide is 3:2. The buffering agent in the rare earth salt mixed solution is boric acid and acetic acid, and the mass ratio of boric acid and acetic acid is 5:2.

[0164] In this embodiment, the anti-settling additive is a solution of mineral soil, xanthan gum, and cellulose thickener, and the mi...

Embodiment 3

[0172] Example 3: Number No.3

[0173] Except for the following differences, the others are the same as in Example 1:

[0174]

[0175] The rest is solvent water.

[0176] In this embodiment, the rare earth salt mixed solution is a mixed solution of cerium nitrate, cerous chloride, praseodymium chloride, sodium peroxide, boric acid, and nitric acid, and the mixing ratio is:

[0177]

[0178] The rest is solvent water.

[0179] In this embodiment, the anti-settling additive is a solution of natural mica powder, gum thickener, and cellulose thickener. The mixing ratio is:

[0180] Natural mica powder: 3%,

[0181] Gum thickener: 4%,

[0182] Cellulose thickener: 5%,

[0183] The rest is solvent water.

[0184] In this embodiment, the gum thickener in the anti-settling additive is guar gum and gum arabic, and the mass ratio of guar gum and gum arabic is 2:1. The cellulose thickener in the anti-settling additive is 30,000-type cellulose and 100,000-type cellulose, and the mass ratio of 30,000-t...

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Abstract

An environment-friendly insulating paint with high punching performance for non-oriented electrical steel, and a preparation method and application thereof. The insulating paint comprises 20%-60% of aluminium dihydrogen phosphate, 2%-40% of an organic resin, 0.5%-5% of silica sol, 1%-10% of phosphate, 0.3-2% of nitrate, 1%-5% of magnesium oxide, 0.3%-5.5% of a rare earth salt mixed solution, 0.5%-5.5% of a silane coupling agent and the balance of solvent water. The insulating paint provided by the invention is a single component organic / inorganic waterborne environment-friendly paint, which has characteristics of good surface state, high adhesion, high insulation, high corrosion resistance and high temperature resistance and environment-friendly characteristics of no chrome or harmful ions, and can be widely used in surface coating treatment of cold-rolled non-oriented electrical steel plate. At the same time, the invention greatly improves and increase the smoothness and punching performance by improving the performance and the proportion of the organic resin, so that the insulating paint is comparable to a traditional chromate insulating coating; the insulating paint greatly prolongs the service life of the die and improves the product processing precision, and is in favor of improving production efficiency and reducing the cost.

Description

Technical field [0001] The present invention belongs to the technical field of steel surface treatment. More specifically, the present invention relates to a related preparation method and application of an environmentally friendly insulating coating for electrical steel with higher punching performance. Background technique [0002] Electrical steel (also known as silicon steel) is a kind of ferrosilicon soft magnetic alloy with very low carbon content. It has a wide range of uses. Electrical steel plates can be used to make iron cores for motors, generators, transformers and ballasts. An important magnetic material indispensable in the military industry. [0003] Usually, the cold-rolled electrical steel sheet needs to be coated with an insulating film with a thickness of 0.5μm~5μm before leaving the factory to ensure that the silicon steel sheet laminates of the iron core have a higher interlayer resistivity during use and reduce the laminates The power loss between layers prev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/25C09D1/00C09D133/00C09D163/00C09D7/12B05D7/24B05D3/02
Inventor 吴彬艾宝魁刘献东齐慧滨刘宝军林安陈卓雷徐成肖盼
Owner SHANGHAI QIJIA CHEM
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