Preparation method of waterborne epoxy resin dispersion

A technology of water-based epoxy resin and solid epoxy resin, which is applied in the direction of epoxy resin coatings and coatings, and can solve problems that affect the water and solvent resistance of the coating film, cannot maintain stability and performance, and cannot meet the development needs of coatings, etc. , to achieve good storage stability and dilution stability, excellent chemical resistance, convenient transportation and use

Active Publication Date: 2021-08-27
广西桂林荣鑫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, waterborne epoxy resin products currently on the market generally have high viscosity and poor stability, which cannot meet the development needs of coatings and other industries.
Waterborne epoxy resins and waterborne epoxy resin dispersions on the market still have certain limitations, mainly reflected in the inability to maintain a good balance between stability and performance. Because obtaining a waterborne epoxy resin dispersion with good stability requires The introduction of large molecular weight hydrophilic groups into the molecular structure of solid epoxy can emulsify the solid epoxy resin. At the same time, the introduction of hydrophilic groups must reach a certain amount to ensure the stability of the system, and excessive hydrophilic monomers will give the system Unfavorable effects of cross-linking and curing will seriously affect the water and solvent resistance of the coating film

Method used

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  • Preparation method of waterborne epoxy resin dispersion
  • Preparation method of waterborne epoxy resin dispersion
  • Preparation method of waterborne epoxy resin dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The operation steps are as follows:

[0026] 1. Add 3000 grams of hydrophilic polyethylene glycol propylene glycol copolymer (PEG / PPG-17 / 6 copolymer) into the four-necked flask, start stirring and raise the temperature to 100°C, and start vacuuming to remove the moisture in the system , kept for 1h, stopped when there were no small bubbles in the four-necked flask, and then lowered the temperature to 70°C.

[0027] 2. Add 20 grams of catalyst boron trifluoride diethyl ether into the four-necked flask, stir for 10 min, then slowly add 900 grams of solid epoxy resin E-20 dilution (mass fraction is 70% solid ring Oxygen resin content of xylene dilution), 1h dropwise, the temperature was kept at 70 ° C for 2-3h.

[0028] 3. Add 15 grams of catalyst boron trifluoride diethyl ether into the four-neck flask, stir for 10 minutes, slowly add 92 grams of epichlorohydrin dropwise, after 1-2 hours, keep the reaction at 80-85°C for 3 hours.

[0029] 4. Raise the temperature to 110...

Embodiment 2

[0034] The operation steps are as follows:

[0035] 1. Add 5000 grams of hydrophilic polyethylene glycol propylene glycol copolymer (PEG / PPG-25 / 30 copolymer) into the four-necked flask, start stirring and raise the temperature to 100°C, and start vacuuming to remove the moisture in the system , kept for 1h, stopped when there were no small bubbles in the four-necked flask, and then lowered the temperature to 70°C.

[0036] 2. Add 30 grams of catalyst N, N dimethylbenzylamine to the four-necked flask, stir for 10 min, then slowly add 1600 grams of solid epoxy resin E-12 dilution (mass fraction is 70 % solid epoxy resin content of xylene dilution), 1h dropwise, the temperature was maintained at 70 ° C for 2-3h.

[0037] 3. Add 20 grams of catalyst N,N dimethylbenzylamine into the four-necked flask, stir for 10 minutes, slowly add 95 grams of epichlorohydrin dropwise, and dropwise for 1-2 hours, keep the reaction at 80-85°C for 3 hours .

[0038] 4. Raise the temperature to 11...

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Abstract

The invention belongs to the technical field of chemical coatings, and discloses a preparation method of a waterborne epoxy resin dispersion. Hydrophilic groups are introduced into solid epoxy resin molecules to form a block molecular structure with the solid epoxy resin, then ring-opening and ring-closing reactions are carried out through epoxy chloropropane, and finally the obtained modified epoxy resin keeps the structural characteristics and reaction activity of the solid epoxy resin. And finally, extending of groups with reaction activity and hydrophilicity to a water phase in a manner of slowly dropwise adding water and dispersing at a high speed, and extending of the solid epoxy resin in the block and the unmodified solid epoxy resin to an oil phase are carried out, so that the stable water borne epoxy resin dispersion is obtained. The waterborne epoxy resin dispersion prepared by the method does not contain volatile organic solvents, and is high in solid content, low in viscosity, good in storage and dilution stability and convenient to transport and use. The waterborne epoxy coating prepared from the epoxy resin has good adhesive force, good salt fog resistance and excellent chemical resistance.

Description

technical field [0001] The invention relates to the technical field of chemical coatings, in particular to a preparation method of a water-based epoxy resin dispersion. Background technique [0002] Solid epoxy resin is widely used, but it needs to be diluted with a large amount of organic solvents during use, which causes great harm to the environment and human body. With the increasing requirements for environmental protection, the application of solid epoxy resin is gradually developing in the direction of high solid, low viscosity and water-based. However, water-based epoxy resin products currently on the market generally have high viscosity and poor stability, which cannot meet the development needs of coatings and other industries. Waterborne epoxy resins and waterborne epoxy resin dispersions on the market still have certain limitations, mainly reflected in the inability to maintain a good balance between stability and performance. Because obtaining a waterborne epox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L63/00C09D163/00
CPCC08J3/03C09D163/00C08J2363/00C08J2463/00C08L63/00
Inventor 王小弟
Owner 广西桂林荣鑫新材料科技有限公司
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