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Waterborne epoxy resin and preparation method thereof, and method for preparing varnish

A water-based epoxy resin and epoxy resin technology, applied in epoxy resin coatings, coatings, etc., can solve the problems of high cost of water-based epoxy resin emulsions, difficult process conditions control, and many synthesis steps, and achieve excellent curing performance. Effect

Active Publication Date: 2013-03-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has many synthetic steps, the control of process conditions is relatively difficult, and the cost of the produced water-based epoxy resin emulsion is relatively high.

Method used

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  • Waterborne epoxy resin and preparation method thereof, and method for preparing varnish
  • Waterborne epoxy resin and preparation method thereof, and method for preparing varnish
  • Waterborne epoxy resin and preparation method thereof, and method for preparing varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of water-based epoxy resin: Add 100 grams of epoxy resin E-44, 12 grams of 2,2-dimethylolpropionic acid, 10 grams of acetone, and 5 grams of chlorinated Benzyltrimethylamine, after mixing, react at 70°C for 3 hours to obtain a water-based epoxy resin.

[0027] The method for preparing varnish by above-mentioned waterborne epoxy resin comprises the following steps:

[0028] Step 1, 100 grams of the prepared water-based epoxy resin is neutralized with 65 grams of aqueous sodium hydroxide solution with a mass fraction of 5%, then it is emulsified with a stirrer, rotated at a high speed for 20 minutes, and the rotating speed is 1000 rpm. Make the stable aqueous epoxy resin emulsion that solid content is 60%;

[0029] The waterborne epoxy resin emulsion performance that makes is as follows:

[0030] Viscosity: 2800mp.s

[0031] Epoxy value: 0.11

[0032] Stability of epoxy resin emulsion: Centrifugal stability: 2000 rpm, no delamination in 30 minutes.

[003...

Embodiment 2

[0037] Preparation of water-based epoxy resin: Add 100 grams of epoxy resin E-51, 14 grams of tartaric acid, 15 grams of acetone, and 4 grams of boron trifluoride ether solution in a three-necked flask equipped with a stirring and temperature control device. The reaction was carried out at ℃ for 4 hours to obtain a water-based epoxy resin.

[0038] The method for preparing varnish by above-mentioned waterborne epoxy resin comprises the following steps:

[0039] Step 1, 100 grams of the prepared water-based epoxy resin is neutralized with 80 grams of aqueous sodium hydroxide solution with a mass fraction of 5%, then it is emulsified with a stirrer, rotated at a high speed for 20 minutes, and the rotating speed is 1000 rpm. Make the stable aqueous epoxy resin emulsion that solid content is 55%;

[0040] The waterborne epoxy resin emulsion performance that makes is as follows:

[0041] Viscosity: 2600mp.s

[0042] Epoxy value: 0.10

[0043] Stability of epoxy resin emulsion: ...

Embodiment 3

[0048] Preparation of water-based epoxy resin: add 100 grams of epoxy resin E-51, 18 grams of gluconic acid, 20 grams of acetone, and 3 grams of p-toluenesulfonic acid in a three-necked flask equipped with a stirring and temperature control device. React at 85°C for 4 hours to obtain a water-based epoxy resin.

[0049] The method for preparing varnish by above-mentioned waterborne epoxy resin comprises the following steps:

[0050] Step 1, 100 grams of the prepared water-based epoxy resin is neutralized with 100 grams of triethylamine aqueous solution with a mass fraction of 2%, then it is emulsified with a stirrer, rotated at a high speed for 20 minutes, and the rotating speed is 1000 rpm, Make a stable water-based epoxy resin emulsion with a solid content of 50%;

[0051] The waterborne epoxy resin emulsion performance that makes is as follows:

[0052] Viscosity: 2500mp.s

[0053] Epoxy value: 0.09

[0054] Stability of epoxy resin emulsion: Centrifugal stability: 2000 ...

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Abstract

The invention relates to a waterborne epoxy resin and a preparation method thereof, and a method for preparing varnish. According to mass percentages, 100 parts of epoxy resin, 10-20 parts of polyhydroxy carboxylic acid, 10-30 parts of acetone, and 1.5-10 parts of a catalyst are mixed and are subjected to a reaction for 3-8h under a temperature of 60-95 DEG C, such that the resin is obtained. The invention also provides a method for preparing the waterborne epoxy resin into an emulsion varnish. According to the invention, the waterborne epoxy resin is neutralized by using an aqueous alkaline solution; the product is emulsified, such that stable waterborne epoxy emulsion with a solid content of 50-60% is prepared; and a curing agent is added, such that the material can be used as an environment-friendly paint or adhesive. The anionic self-emulsifying waterborne epoxy resin emulsion provided by the invention has the technical characteristics of small particle size, high stability, excellent cured product performances, and the like. The anionic self-emulsifying waterborne epoxy resin emulsion can be widely applied in fields such as paints, adhesives, fine chemical auxiliary agents, and the like.

Description

technical field [0001] The invention relates to a water-based epoxy resin, a preparation method thereof and a method for preparing a varnish. Background technique [0002] Due to its excellent physical and chemical properties, epoxy resin is widely used in various sectors of national defense and national economy for casting, impregnation, lamination, adhesives, coatings, etc. However, because most of the traditional epoxy resins are solvent-based, difficult to dissolve in water, and only soluble in organic solvents such as aromatic hydrocarbons, ketones and alcohols, not only the cost is high, but also volatile and flammable, which makes epoxy The use of resin is restricted by environmental pollution, construction safety and other aspects. With the increasingly urgent and strict requirements for environmental protection, systems that do not contain volatile organic compounds (NOC), or low volatile organic compounds (LVOC), or do not contain harmful air pollutants (HAP) have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/62C08G59/24C08G59/16C09D163/02
Inventor 曹瑞军房忠芳常刚
Owner XI AN JIAOTONG UNIV