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Preparation method of waterborne epoxy resin emulsion

A technology of water-based epoxy resin and epoxy resin, applied in epoxy resin coatings, coatings, etc., can solve the problems of poor water resistance, poor toughness and low strength of water-based epoxy coatings, and achieve good centrifugal stability and particle size The effect of concentrated distribution and toughness

Inactive Publication Date: 2017-05-24
QINGDAO SENMEIKE CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the emulsifiers used in the above patents are polyether-type non-ionic emulsifiers. The water-based epoxy coatings prepared by such emulsifiers have poor toughness, low strength, and poor water resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Preparation of emulsifier

[0017] Octylphenol polyoxyethylene ether and polyoxyethylene sorbitan monolaurate are mixed in a molar ratio of 1:1.1, adding 0.6% sodium lauryl sulfate, and heating up to 70°C under nitrogen protection. Stir and react for 4 hours, cool down to 60°C to obtain a prepolymer, then add epoxy alcohol with a molar ratio of 0.5 to octylphenol polyoxyethylene ether, and stir and react for 4 hours under nitrogen protection to obtain an emulsifier;

[0018] 2) Preparation of water-based epoxy resin emulsion

[0019] In terms of mass fraction, heat 300g of epoxy resin E-51 in a water bath to 70°C, then put it into an ultrasonic instrument, add 21g of emulsifier and 5mL of propylene glycol methyl ether under a 6000r / min high shear machine, and start dripping after about 5min Heat the water and keep the temperature in the beaker at about 70°C. Stop adding water dropwise during phase inversion, add the remaining water dropwise after high-shearing for 1...

Embodiment 2

[0021] 1) Preparation of emulsifier

[0022] Octylphenol polyoxyethylene ether and polyoxyethylene sorbitan monolaurate are mixed in a molar ratio of 1:1.1, and 2% sodium lauryl sulfate is added by mass, and the temperature is raised to 70° C. under nitrogen protection and Stir and react for 4 hours, cool down to 60°C to obtain a prepolymer, then add epoxy alcohol with a molar ratio of 0.5 to octylphenol polyoxyethylene ether, and stir and react for 4 hours under nitrogen protection to obtain an emulsifier;

[0023] 2) Preparation of water-based epoxy resin emulsion

[0024] In terms of mass fraction, heat 300g of epoxy resin E-51 in a water bath to 70°C, then put it into an ultrasonic instrument, add 21g of emulsifier and 5mL of propylene glycol methyl ether under a 6000r / min high shear machine, and start dripping after about 5min Heat the water and keep the temperature in the beaker at about 70°C. Stop adding water dropwise during phase inversion, add the remaining water dr...

Embodiment 3

[0026] 1) Preparation of emulsifier

[0027] Octylphenol polyoxyethylene ether and polyoxyethylene sorbitan monolaurate are mixed in a molar ratio of 1:1.1, adding 6% sodium lauryl sulfate by mass, heating up to 70°C under nitrogen protection and Stir and react for 4 hours, cool down to 60°C to obtain a prepolymer, then add epoxy alcohol with a molar ratio of 0.5 to octylphenol polyoxyethylene ether, and stir and react for 4 hours under nitrogen protection to obtain an emulsifier;

[0028] 2) Preparation of water-based epoxy resin emulsion

[0029] In terms of mass fraction, heat 300g of epoxy resin E-51 in a water bath to 70°C, then put it into an ultrasonic instrument, add 21g of emulsifier and 5mL of propylene glycol methyl ether under a 6000r / min high shear machine, and start dripping after about 5min Heat water and keep the temperature in the beaker at about 70°C. Stop adding water dropwise during phase inversion, add the remaining water dropwise after high-shearing for ...

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PUM

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Abstract

The invention discloses a preparation method of a waterborne epoxy resin emulsion, and relates to preparation of a waterborne epoxy resin emulsion and an emulsifying agent for the waterborne epoxy resin emulsion. The waterborne epoxy resin emulsion uses the emulsifying agent prepared from octylphenol polyoxyethylene ether, polyoxyethylene sorbitan monolaurate and sodium lauryl sulfate as a composite system, and is prepared under the actions of high shear and ultrasonic and in combination with a phase reversing technology. The prepared epoxy resin emulsion has the characteristics of fine dispersed phase particles, concentrated particle size distribution, good centrifugal stability, freeze-thaw stability, dilution stability and the like; compared with the conventional epoxy resin emulsion, the waterborne epoxy resin emulsion provided by the invention has the advantages as follows: the cured coating has stronger toughness, strength, adhesion and water resistance.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to the preparation of water-based epoxy resin emulsion and its emulsification, and belongs to the technical field of epoxy resin water-based paint. Background technique [0002] Traditional anti-corrosion paints are mostly solvent-based paints. These paints contain a large amount of organic solvents, which will volatilize into the atmosphere during the construction process, which is harmful to the health of construction workers and pollutes the environment. In recent years, people's awareness of environmental protection has been continuously enhanced. The environmental protection regulations of various countries in the world have increasingly strict restrictions on the content of volatile organic compounds in coatings. The coating industry is developing in the direction of low pollution and energy saving. Waterborne epoxy coatings have the advantages of very little solvent content, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L63/00C08L71/02C09D163/00C09D7/12
Inventor 李春梅
Owner QINGDAO SENMEIKE CHEM TECH CO LTD
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