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A kind of preparation method of waterborne epoxy resin

A water-based epoxy resin, epoxy resin technology, applied in the direction of epoxy resin glue, epoxy resin coating, adhesive type, etc. The effect of small amount, mild conditions and simple preparation method

Active Publication Date: 2021-11-30
NINGBO POWER SUPPLY COMPANY STATE GRID ZHEJIANG ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical method is also called the direct emulsification method. The advantages of the direct emulsification method are low cost and simple preparation process. The disadvantage is that the prepared water-based epoxy resin has a large particle size (> 10 μm) and poor stability of the system.

Method used

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  • A kind of preparation method of waterborne epoxy resin
  • A kind of preparation method of waterborne epoxy resin
  • A kind of preparation method of waterborne epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] refer to figure 1 , in a four-neck flask equipped with a stirrer, a spherical condenser, a constant pressure dropping funnel and a thermometer, add 0.01mol of bisphenol A epoxy resin E51 and a certain amount of propylene glycol methyl ether, preheat at 40°C for 30min, Mix the epoxy resin and the solvent evenly, raise the temperature to 60°C, slowly add 0.045mol N,N-dimethylethylenediamine dropwise, react at constant temperature for 6 hours, distill the solvent in the system under reduced pressure, and add it to acetic acid at 60°C After reacting for 30 minutes, add a certain amount of deionized water, stir rapidly for 30 minutes to carry out water dispersion, and obtain a water-based epoxy resin with a solid content of 70%.

Embodiment 2

[0034] refer to figure 1 , in a four-neck flask equipped with a stirrer, a spherical condenser, a constant pressure dropping funnel and a thermometer, add 0.1mol of bisphenol A epoxy resin E51 and a certain amount of propylene glycol methyl ether, preheat at 40°C for 30min, Mix the epoxy resin and the solvent evenly, raise the temperature to 60°C, slowly add 0.05mol N,N-dimethylethylenediamine dropwise, react at constant temperature for 6 hours, distill the solvent out of the system under reduced pressure, and add it to acetic acid at 60°C After reacting for 30 minutes, add a certain amount of deionized water, stir rapidly for 30 minutes to carry out water dispersion, and obtain a water-based epoxy resin with a solid content of 70%.

Embodiment 3

[0036] refer to figure 1 , in a four-neck flask equipped with a stirrer, a spherical condenser, a constant pressure dropping funnel and a thermometer, add 0.1mol of bisphenol A epoxy resin E51 and a certain amount of propylene glycol methyl ether, preheat at 40°C for 30min, Mix the epoxy resin and the solvent evenly, raise the temperature to 60°C, slowly add 0.04mol N,N-dimethylethylenediamine dropwise, react at constant temperature for 6 hours, distill the solvent out of the system under reduced pressure, and add it to acetic acid at 60°C After reacting for 30 minutes, add a certain amount of deionized water, stir rapidly for 30 minutes to carry out water dispersion, and obtain a water-based epoxy resin with a solid content of 70%.

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Abstract

The invention provides a preparation method of water-based epoxy resin, which uses N,N-dimethylethylenediamine modified epoxy resin to introduce hydrophilic group hydroxyl and amino groups, and then neutralizes with acid to form a salt to make a stable Waterborne epoxy resin emulsion. The water-based epoxy resin prepared by the invention has a simple preparation process and good water solubility, and can be used with some water-based epoxy resin curing agents to form a coating film.

Description

technical field [0001] The invention relates to the field of epoxy resin modification, in particular to a preparation method of water-based epoxy resin. Background technique [0002] Epoxy resin has good corrosion resistance, bonding performance, mechanical properties and electrical insulation properties, and is widely used in construction, transportation, electronics, machinery and other fields. Traditional solvent-based epoxy resins need to be diluted with organic solvents. Most of these organic solvents are volatile and will pollute the environment and endanger human health. Therefore, it is very important to develop low-VOC water-based epoxy resins. At present, there are three methods for waterborne epoxy resin: mechanical method, phase inversion method and chemical modification method. The mechanical method is also called the direct emulsification method. The advantages of the direct emulsification method are low cost and simple preparation process. The disadvantage is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/14C09D163/00C09J163/00
CPCC08G59/1477C09D163/00C09J163/00
Inventor 王凯军周开河王彬栩方云辉杨跃平王立平王娟赵海超蒲吉斌陈科锋刘桐
Owner NINGBO POWER SUPPLY COMPANY STATE GRID ZHEJIANG ELECTRIC POWER