A kind of preparation method of amino acid modified self-emulsifying waterborne epoxy resin

A water-based epoxy resin and epoxy resin technology, applied in the field of amino acids, can solve the problems of ecological environment damage and epoxy resin insoluble in water, etc., and achieve the effects of good emulsification performance, good water resistance and alkali resistance, and simple process

Active Publication Date: 2017-02-01
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the widely used solvent-based epoxy resin contains a large amount of organic solvents, which will cause damage to the ecological environment, and the epoxy resin itself cannot be dissolved in water, so the preparation of a water-based epoxy resin has attracted more and more attention.

Method used

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  • A kind of preparation method of amino acid modified self-emulsifying waterborne epoxy resin
  • A kind of preparation method of amino acid modified self-emulsifying waterborne epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Add 20ml of absolute ethanol and 23.5g of epoxy resin E-42 (epoxy value 0.42mol / 100g) into a 250ml three-neck flask in turn, then place the flask in an oil bath, heat it to 70°C, and turn it on Stirring device to mix anhydrous ethanol and epoxy resin evenly;

[0038] 2) Weigh 3.45g of L-proline and put it into the reaction system. After a few hours, after the reaction is complete, the mixed liquid of modified epoxy resin containing carboxyl groups can be obtained;

[0039] 3) Add 3.03g of triethylamine to the mixed liquid in step 2), and carry out neutralization reaction at 60°C;

[0040] 4) After the neutralization reaction is complete, slowly add deionized water dropwise under high-speed stirring to prepare a water-based epoxy resin emulsion with a solid content of 50%;

[0041] 5) Mix the synthesized water-based epoxy resin emulsion and water-based epoxy curing agent at a molar ratio of epoxy group to amine group of 1:1, stir evenly to obtain a water-based epoxy ...

Embodiment 2

[0051]1) Add 20ml of absolute ethanol and 22.5g of epoxy resin E-44 (epoxy value 0.44mol / 100g) into a 250ml three-neck flask in turn, then place the flask in an oil bath, heat to 70°C, and start stirring device to mix absolute ethanol and epoxy resin evenly;

[0052] 2) Weigh 3.45g of L-proline and put it into the reaction system. After a few hours, after the reaction is complete, the mixed liquid of modified epoxy resin containing carboxyl groups can be obtained;

[0053] 3) Add 3.03g of triethylamine to the mixed liquid in step 2), and carry out neutralization reaction at 60°C;

[0054] 4) After the neutralization reaction is complete, slowly add deionized water dropwise under high-speed stirring to prepare a water-based epoxy resin emulsion with a solid content of 50%;

[0055] 5) Mix the synthesized water-based epoxy resin emulsion and water-based epoxy curing agent at a molar ratio of epoxy group to amine group of 1:1, stir evenly to obtain a water-based epoxy varnish, a...

Embodiment 3

[0065] 1) Add 20ml of absolute ethanol and 19.5g of epoxy resin E-51 (epoxy value 0.51mol / 100g) into a 250ml three-neck flask in turn, then place the flask in an oil bath, heat to 70°C, and turn on Stirring device to mix anhydrous ethanol and epoxy resin evenly;

[0066] 2) Weigh 3.45g of L-proline and put it into the reaction system. After a few hours, after the reaction is complete, the mixed liquid of modified epoxy resin containing carboxyl groups can be obtained;

[0067] 3) Add 3.03g of triethylamine to the mixed liquid in step 2), and carry out neutralization reaction at 60°C;

[0068] 4) After the neutralization reaction is complete, slowly add deionized water dropwise under high-speed stirring to prepare a water-based epoxy resin emulsion with a solid content of 50%;

[0069] 5) Mix the synthesized water-based epoxy resin emulsion and water-based epoxy curing agent at a molar ratio of epoxy group to amine group of 1:1, stir evenly to obtain a water-based epoxy varnis...

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Abstract

The invention relates to a preparation method of amino acid modified self-emulsifying waterborne epoxy resin and relates to the technical field of utilizing amino acid modified epoxy resin. The preparation method comprises the following specific steps: (1) sequentially adding absolute ethyl alcohol and epoxy resin to a three-mouth flask, placing the flask in an oil bath pan, heating to 70 DEG C, and starting a stirring device so that the absolute ethyl alcohol and the epoxy resin are uniformly mixed; (2) pouring L-proline in a reaction system to prepare carboxyl-containing modified epoxy resin mixed liquid after complete reaction in multiple hours; (3) adding organic alkali to the modified epoxy resin mixed liquid prepared from the step 2 for neutral reaction at 60 DEG C; and (4) after the neutral reaction is complete, slowly dropwise adding deionized water under high-speed stirring to prepare the self-emulsifying waterborne epoxy resin emulsion. The waterborne epoxy resin emulsion prepared by the invention is in nanoscale and is good in stability and excellent in toughness and water resistance after being solidified to a membrane.

Description

technical field [0001] The invention relates to the technical field of epoxy resin modified by amino acid, in particular to the hydrophilic modification of epoxy resin by an amino acid with special structure, that is, L-proline. Background technique [0002] Epoxy resins are widely used in electrical insulation products and packaging materials. The epoxy resin cured at high temperature has high application value because of its good mechanical strength, heat resistance, electrical insulation performance, and low price. Currently widely used solvent-based epoxy resin contains a large amount of organic solvents, which will cause damage to the ecological environment, and epoxy resin itself cannot be dissolved in water, so the preparation of a water-based epoxy resin has attracted more and more attention. [0003] At present, the preparation methods of waterborne epoxy resin mainly include mechanical method, external emulsifier method and chemical modification method. The water-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/16C08G59/64C08G59/50C09D163/00
Inventor 李锦春李京亚赵彩霞邹国享张鑫
Owner CHANGZHOU UNIV
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