Water-borne epoxy resin, preparation method thereof and water-borne epoxy insulating impregnating varnish

A water-based epoxy resin, insulating impregnating paint technology, applied in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of high odor, poor flexibility, poor coil wettability, etc., to achieve low odor, water resistance and Excellent resistance to salt spray and improved wettability

Pending Publication Date: 2020-12-04
上海华谊涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the chemical modification method, the performance of the water-based epoxy resin prepared by the grafting reaction type method is better, but due to the residual problem of the acrylate monomer, the odor is relatively large; the water-based epoxy resin prepared by the etherification type method is prepared The water-based epoxy impregnating paint film is brittle and has poor flexibility; the water-based epoxy insulating impregnating paint prepared by the esterification method has poor wettability to the coil

Method used

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  • Water-borne epoxy resin, preparation method thereof and water-borne epoxy insulating impregnating varnish
  • Water-borne epoxy resin, preparation method thereof and water-borne epoxy insulating impregnating varnish
  • Water-borne epoxy resin, preparation method thereof and water-borne epoxy insulating impregnating varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of waterborne epoxy resin A1

[0029] Add 210 parts of soy oil, 443 parts of NPES-904 epoxy resin and 2 parts of benzyltriethylammonium chloride into the reaction flask, and start to heat up after passing nitrogen gas for 10 minutes; when the temperature rises to 120°C, the materials melt and start stirring; Continue to raise the temperature to 220°C, and keep the reaction at this temperature until the acid value is 10mgKOH / g, then lower the temperature; when the temperature drops to 150°C, add 250 parts of ethylene glycol butyl ether and 95 parts of tung oil anhydride, and keep it at This temperature range was reacted for 5 hours to obtain water-based epoxy resin A1. The waterborne epoxy resin is a transparent viscous liquid with a solid content of 74.7% (weight) and an acid value of 49.9 mgKOH / g (pure solid).

Embodiment 2

[0031] Preparation of Waterborne Epoxy Ester Resin A2

[0032] Add 250 parts of dehydrated ricinoleic acid, 355 parts of F-51 epoxy resin and 2 parts of tetraethylammonium bromide into the reaction flask, and start to heat up after passing nitrogen gas for 15 minutes; when the temperature rises to 80°C, the materials melt and start stirring; Continue to raise the temperature to 220°C, and keep the reaction at this temperature until the acid value is 5mgKOH / g, then lower the temperature; when the temperature drops to 140°C, add 320 parts of dipropylene glycol methyl ether and 73 parts of maleic anhydride, and keep at The temperature range was reacted for 3 hours to obtain the water-based epoxy resin A2. The waterborne epoxy resin is a transparent viscous liquid with a solid content of 67.5% (weight) and an acid value of 49 mgKOH / g (pure solid).

Embodiment 3

[0034] Preparation of Waterborne Epoxy Ester Resin A3

[0035] Add 252 parts of tall oleic acid, 384 parts of NPES-901 epoxy resin and 1 part of zinc oxide into the reaction flask, and start to heat up after passing nitrogen gas for 20 minutes; when the temperature rises to 100°C, the materials melt and start stirring; °C, and keep it at this temperature for reaction, and then lower the temperature until the acid value is 8mgKOH / g; when the temperature drops to 150°C, add 300 parts of diethylene glycol dimethyl ether and 63 parts of trimellitic anhydride, and keep it in this temperature range React for 4 hours to obtain water-based epoxy resin A3. The waterborne epoxy resin is a transparent viscous liquid with a solid content of 69.3% (weight) and an acid value of 44.8mgKOH / g (pure solid).

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Abstract

The invention provides water-borne epoxy resin, a preparation method of the water-borne epoxy resin and water-borne epoxy insulating impregnating varnish prepared from the water-borne epoxy resin. Thepreparation method of the water-borne epoxy resin comprises the following steps: adding vegetable oil fatty acid, epoxy resin and a catalyst into a reaction bottle, introducing nitrogen, heating, melting materials, stirring, heating to 220 to 230 DEG C until the acid value is 5 to 10mgKOH / g, then cooling to 130-150 DEG C, adding a cosolvent and a functional hydrophilic monomer, reacting for 3-5 hours, and cooling after the acid value is 40-60mgKOH / g, thereby obtaining the water-borne epoxy resin. The preparation method of the water-borne epoxy resin is simple, the resin viscosity is low, gelis not prone to occurring, the synthesis process and the product quality are easy to control, and the prepared water-borne epoxy resin is low in smell and has good hydrolysis resistance and storage stability. The water-borne epoxy insulating impregnating varnish is good in storage stability, low in odor, good in base material wettability, high in bonding strength and excellent in water resistanceand salt spray resistance.

Description

technical field [0001] The invention belongs to the technical field of water-based epoxy resin and insulating impregnating varnish, specifically relates to a water-based epoxy resin and a preparation method thereof, and also relates to a method for preparing a water-based epoxy insulating impregnating varnish using the water-based epoxy resin as a base material Preparation. Background technique [0002] Insulating impregnating varnish is one of the three main insulating materials for winding insulation of electrical products. Through the dipping process, the insulating varnish is infiltrated and filled into the gaps and pores of the coil, wire slot or other insulating materials, and then the coil wire is bonded into an insulating whole after curing, and a continuous insulating layer is formed on its surface, which can improve the insulating structure. Dielectric properties, mechanical properties, thermal conductivity and protective properties. Therefore, the quality of ins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/16C08G59/14C09D163/10C09D5/08C09D5/25
CPCC08G59/1472C08G59/1455C08G59/1438C09D163/10C09D5/08C09D5/00
Inventor 赵其中
Owner 上海华谊涂料有限公司
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