Method for preparing water soluble epoxy insulated resin in alkaline medium

A technology of epoxy insulation and alkaline medium, which is applied in the field of electrical insulation treatment. It can solve the problems of irregular shape particle size distribution, large particle size of dispersed phase, and inability to perform thick layer curing. The effect of low content and high stability of the solution

Active Publication Date: 2009-10-07
上海电动工具研究所(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the dispersed phase particles prepared by the first two methods is relatively large, all of which are in the micron order. However, the water-soluble epoxy insulating resin prepared by chemical modification on the market is acidic and highly corrosive to metals. Therefore, it greatly limits its application in the field of electrical insulation treatment. Applications
In addition, the epoxy resin synthesized from dry vegetable oil relies on oxygen absorption to oxidize and dry, so it can only be applied to the surface coating film, and cannot be cured in thick layers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step: Weigh 10 parts by weight of epoxy resin E-12 (produced by Wuxi Resin Factory), 7 parts by weight of acetic acid, 2 parts by weight of succinic anhydride, 10 parts by weight of ethylene glycol, 2 parts by weight of methylamine and a conductivity of 10 μs 60 parts by weight of deionized water;

[0020] The second step: add epoxy resin, acetic acid, 20% succinic anhydride and 80% ethylene glycol in a 1000ml three-necked flask equipped with a stirrer, condenser, and dropping funnel, pass into nitrogen protection, and stir at 200 ° C React for 2 hours; add 70% succinic anhydride and the remaining ethylene glycol, stir and react at 160°C for 4 hours, add the remaining succinic anhydride, continue to keep warm for 1 hour, cool down to 110°C, add ether solvent, keep stirring for 0.5 h, add methylamine dropwise at 90°C, continue to heat and stir for 0.5 hours after adding, add deionized water, continue to heat and stir for 1 hour, and cool to room temperature to ...

Embodiment 2

[0022] The first step: take by weighing 25 parts by weight of epoxy resin E-20 (produced by Wuxi Resin Factory), 15 parts by weight of propionic acid, 8 parts by weight of maleic anhydride, 25 parts by weight of propylene glycol, 7 parts by weight of cycloethylamine, ethanol 15 parts by weight of glycol monomethyl ether and 30 parts by weight of deionized water with a conductivity of 0.1 μs;

[0023] The second step: add epoxy resin, propionic acid, 80% maleic anhydride and 20% propylene glycol in the 1000ml there-necked flask equipped with agitator, condenser, dropping funnel, pass into nitrogen protection, at 220 Stir the reaction at ℃ for 4 hours; add 10% maleic anhydride and the remaining propylene glycol, stir and react at 170°C for 7 hours, add the remaining maleic anhydride, continue the heat preservation reaction for 2 hours, cool down to 125°C, add ethylene Glycol monomethyl ether, heat preservation and stirring for 1 hour, add cycloethylamine dropwise at 100°C, conti...

Embodiment 3

[0025] The first step: take by weighing 17 parts by weight of epoxy resin E-44 (produced by Wuxi Resin Factory), 10 parts by weight of stearic acid, 5 parts by weight of phthalic anhydride, 17 parts by weight of diethylene glycol, 5 parts by weight of propylamine, 7.5 parts by weight of propylene glycol methyl ether and 30 to 60 parts by weight of deionized water with a conductivity of 1 μs;

[0026] The second step: add epoxy resin, stearic acid, 30% phthalic anhydride and 50% diethylene glycol in a 1000ml three-necked flask equipped with a stirrer, condenser, and dropping funnel, and pass into nitrogen protection , stirred and reacted at 210°C for 3 hours; added 70% phthalic anhydride and the remaining diethylene glycol, stirred and reacted at 165°C for 5 hours, added the remaining phthalic anhydride, continued the heat preservation reaction for 1.5 hours, and cooled to 120°C, add propylene glycol methyl ether, keep stirring for 0.5h, add propylamine dropwise at 95°C, contin...

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PUM

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Abstract

The invention provides a method for preparing water soluble epoxy insulated resin in alkaline medium, which is characterized in comprising the following steps: weighing the following materials by weight parts: epoxy resin 10-25, carboxy 7-15, acid anhydrides 2-8, polyhydric alcohol 10-25, organic amine 2-7, ether solvent 0-15, and deionized water 30-60; stirring and mixing the materials under protection of inert gas. The invention synthesizes water soluble epoxy insulated resin by chemical modification method, has the advantages of simple process, convenient operation, and no poisonous gases discharged in the synthesis process; the prepared water soluble resin is intermiscible with water in alkaline medium, has the advantages of homogeneous, transparent, high storage stability and high solidification speed cooperated with aqueous curing agent; and the condensate has the advantages of good insulating property, low shrinkage, good toughness, high mechanical strength and high heat resistance grade to F. The invention is suitable for the insulation treatment for all kinds of motors and coils, also can be used as base resin of metal baking vanish.

Description

technical field [0001] The invention relates to a preparation method of a water-soluble epoxy insulating resin in an alkaline medium, and the product is used for the insulation treatment of electric tools, series motor rotors for automobiles and motorcycles, water pump motor rotors, generator stator rotors, and electrical coils , belongs to the technical field of electrical insulation treatment. Background technique [0002] Epoxy resin is an important class of thermosetting resin, and it is the most widely used matrix resin in baking coatings. Epoxy resin has excellent bonding properties, wear resistance, mechanical properties, electrical insulation properties, chemical stability, high and low temperature resistance, low shrinkage, easy processing and other advantages. It is used in adhesives, special coatings, electronic and electrical insulation Materials and other fields have been widely used. However, due to the high viscosity of epoxy resin at room temperature, in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/16
Inventor 陆顺平张防罗小锋
Owner 上海电动工具研究所(集团)有限公司
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