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Environment-friendly insulation paint used on non-oriented electrical steel, and preparation method thereof

A technology for oriented electrical steel and insulating coatings, applied in epoxy resin coatings, coatings, etc., can solve the problems of exposed coating film, short storage time of non-oriented steel coatings, etc., and achieve long storage time, good red line absorption and Insulation, uniform coating effect

Inactive Publication Date: 2014-08-06
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an environmentally friendly insulating coating for non-oriented electrical steel in view of the above-mentioned prior art, which overcomes the short storage time and poor construction of non-oriented steel coatings with polymer emulsion as the main film-forming substance. It does not gel after long-term use, and the coating film has the problem of "dew crystals"

Method used

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  • Environment-friendly insulation paint used on non-oriented electrical steel, and preparation method thereof
  • Environment-friendly insulation paint used on non-oriented electrical steel, and preparation method thereof
  • Environment-friendly insulation paint used on non-oriented electrical steel, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The preparation of the waterborne epoxy resin A of embodiment 1 modification

[0034] (1) Dissolution of epoxy resin: Add 4kg of solvent ethylene glycol butyl ether and 8kg of bisphenol A epoxy resin E-51 into the reaction kettle, heat up to 25°C, and stir until uniform;

[0035] (2) Heat up to 75°C, add 0.8kg modifier diethanolamine dropwise within 1 hour, and keep warm for 2-4 hours;

[0036] (3) Extract the solvent under reduced pressure;

[0037] (4) Cool down to 55°C, slowly add 0.2-1kg of neutralizing agent (phosphoric acid) until the pH reaches 4.5-4.8, and stir at constant temperature for 0.5 hours after adding;

[0038] (5) Add deionized water to dilute to a solid content of 30% to 40% to prepare a modified water-based epoxy resin A.

Embodiment 2

[0039] The preparation of the waterborne epoxy resin B of embodiment 2 modification

[0040] (1) Dissolution of epoxy resin: add solvent 4kg (among them, toluene: 1kg, xylene: 2kg, ether: 1kg) and epoxy resin 8kg (among them, bisphenol A type epoxy resin E-20 : 4kg, bisphenol A type epoxy resin E-41: 4kg), be warming up to 50 ℃, stir to evenly;

[0041] (2) Raise the temperature to 80°C, add 0.8kg modifier dropwise within 1 hour (among them, monoethanolamine: 0.4kg, triethanolamine: 0.4kg), and keep warm for 2-4 hours;

[0042] (3) Extract the solvent under reduced pressure;

[0043] (4) Cool down to 60°C, slowly add 0.2-1kg of neutralizing agent (among them, hydrochloric acid accounts for 60%, oxalic acid accounts for 40%) until the pH reaches 4.5-4.8, and stir at constant temperature for 0.5 hours after adding;

[0044] (5) Add deionized water to dilute to a solid content of 30% to 40% to prepare modified water-based epoxy resin B.

Embodiment 3

[0045] The preparation of the waterborne epoxy resin C of embodiment 3 modification

[0046](1) Dissolution of epoxy resin: add solvent 4kg (among them, ethylene glycol methyl ether: 2kg, ethylene glycol butyl ether: 2kg) and epoxy resin 8kg (among them, bisphenol A type epoxy resin E -51:6kg, bisphenol A type epoxy resin E-41:2kg), be heated up to 75 ℃, stir until uniform;

[0047] (2) Raise the temperature to 70°C, add 0.8kg of modifier dropwise within 1 hour (including diethanolamine: 0.6kg, dimethylethanolamine: 0.2kg), and keep warm for 2-4 hours;

[0048] (3) Extract the solvent under reduced pressure;

[0049] (4) Cool down to 50°C, slowly add 0.2-1kg of neutralizing agent (among them, phosphoric acid accounts for 80%, sulfuric acid accounts for 20%) until the pH reaches 4.5-4.8, and stir at constant temperature for 0.5 hours after adding;

[0050] (5) Add deionized water to dilute to a solid content of 30% to 40% to prepare a modified water-based epoxy resin C.

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Abstract

The invention relates to an environmentally friendly insulating coating for non-oriented electrical steel and a preparation method thereof, which is prepared by mass percentage of the following components: 20% to 40% of modified water-based epoxy resin; 20% of aluminum dihydrogen phosphate ~30%; zinc compounds 0.1%~3%; copper compounds 0.1%~1%; cobalt compounds 0.1%~1%; nickel compounds 0.1%~1%; silica sol 10%~30%; surface activity Agent 1% to 3%; deionized water 20% to 30%. The beneficial effects of the present invention are: the non-oriented steel coating prepared with the modified water-based epoxy resin solution, the volatilization speed of the water content in the coating process matches the silicon steel coating line speed, and the coating film is uniform during film formation; and because It is a solution, so it has a long storage time, and it will not gel when used for a long time during construction, and the problem of "dew crystals" will not appear on the coating film.

Description

technical field [0001] The invention relates to an environment-friendly insulating coating for non-oriented electrical steel and a preparation method thereof. Background technique [0002] Non-oriented silicon steel is mainly used in small and medium-sized motors. When the motor is running at a certain frequency, the alternating magnetic field will produce eddy current loss. In order to reduce the eddy current loss, it is necessary to apply an insulating coating on the surface of the steel plate. The coating should not only have good insulation, adhesion, and corrosion resistance, but also require some other properties (such as punching, welding, and adhesion) to meet the needs of motor users for processing and motor operation. , heat resistance, oil resistance, etc.). [0003] Chinese patent CN101591495A reports a non-oriented steel coating using acrylate emulsion as a film-forming substance; Chinese patent CN101910464A reports a non-oriented steel coating using polyeste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/02C09D5/25C09D7/12
Inventor 张良均谈伟成沈珍慧张欢雷田刘洋
Owner WUHAN INSTITUTE OF TECHNOLOGY