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Anionic water-based epoxy resin emulsion and its preparation method and application

A water-based epoxy resin, anionic technology, applied in anti-fouling/underwater coatings, biocide-containing paints, coatings, etc., can solve problems such as poor storage stability, strong emulsion taste, and easy delamination. Achieve improved stability and high solid content

Active Publication Date: 2020-05-05
GUANGZHOU LEOBO PAINT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based epoxy resins are mostly emulsified by adding emulsifiers or chemically modifying the resin by phase inversion. The storage stability of the former is poor, and the emulsion will slowly precipitate over time, while the latter is prone to delamination, and the emulsion the taste is bigger

Method used

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  • Anionic water-based epoxy resin emulsion and its preparation method and application
  • Anionic water-based epoxy resin emulsion and its preparation method and application
  • Anionic water-based epoxy resin emulsion and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of aqueous epoxy resin emulsion, its preparation process is as follows:

[0038]S1. Put 160 parts of epoxy resin E-44 into a four-necked flask, start stirring and slowly raise the temperature to 55°C to stop the temperature rise, add 90 parts of TDI, heat it up to 60°C for 40 minutes, and then add 126.54 parts of IPDI measured Add 3 drops of bismuth isooctanoate dropwise to a four-necked flask, and slowly raise the temperature to 68±2°C for 90 minutes;

[0039] S2. Add 40 parts of PCL with a molecular weight of 1500-2000 and 30 parts of 1,6-hexanediol into the four-neck flask, and keep warm at 68±2°C for 60 minutes;

[0040] S3. Add 32 parts of DMBA dissolved in DMF, drop 3 drops of stannous octoate and incubate at 68±2°C for 2 hours;

[0041] S4. The content of NCO in the system is detected by the di-n-butylamine method. When the NCO content reaches 3.0-4.0%, add 70 parts of epoxy resin E-51 and keep it at 66-68°C for 60 minutes, then raise the temperature to 7...

Embodiment 2

[0044] A kind of aqueous epoxy resin emulsion, its preparation process is as follows:

[0045] S1. Put 190 parts of epoxy resin E-44 into a four-necked flask, start stirring and slowly raise the temperature to 55°C to stop the temperature rise, add 90 parts of TDI, heat it up to 60°C for 40 minutes, and then add 160 parts of IPDI measured Add 4 drops of bismuth isooctanoate dropwise to a four-necked flask, and slowly raise the temperature to 68±2°C for 90 minutes;

[0046] S2. Add 50 parts of PCL with a molecular weight of 1500-2000 and 30 parts of 1,6-hexanediol into the four-neck flask, and keep warm at 68±2°C for 60 minutes;

[0047] S3. Add 38 parts of DMBA dissolved in DMF, add 4 drops of stannous octoate dropwise and incubate at 68±2°C for 2 hours;

[0048] S4. The content of NCO in the system is detected by the di-n-butylamine method. When the NCO content reaches 3.5-4.0%, add 52 parts of epoxy resin E-51 and keep it at 66-68°C for 60 minutes, then raise the temperatur...

Embodiment 3

[0051] A kind of aqueous epoxy resin emulsion, its preparation process is as follows:

[0052] S1. Put 170 parts of epoxy resin E-44 into a four-neck flask, start stirring and slowly raise the temperature to 55°C to stop the temperature rise, add 70 parts of TDI, heat it up to 60°C for 40 minutes, and then add 150 parts of IPDI measured Add 3 drops of bismuth isooctanoate dropwise to a four-necked flask, and slowly raise the temperature to 68±2°C for 90 minutes;

[0053] S2. Add 40 parts of PCL with a molecular weight of 1500-2000 and 40 parts of 1,6-hexanediol into the four-necked flask, and keep warm at 68±2°C for 60 minutes;

[0054] S3. Add 35 parts of DMBA dissolved in DMF, drop 3 drops of stannous octoate, and keep warm at 68±2°C for 2 hours;

[0055] S4. The NCO content in the system is detected by the di-n-butylamine method. When the NCO content reaches 1.8-2.45%, add 75 parts of epoxy resin E-51 and keep it at 66-68°C for 60 minutes, then raise the temperature to 75°...

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PUM

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Abstract

The invention discloses an anionic water-borne epoxy resin emulsion and a preparation method thereof. The preparation method comprises following steps: S1, 160-200 parts of epoxy resin E-44 is added to a reaction vessel, and after heating, 210-250 parts of diisocyanate is added for a reaction; S2, 40-50 parts of polycaprolactone and 30-50 parts of small-molecule diol are added, and a heat insulating reaction is performed for a period of time; S3, 30-40 parts of dimethylolbutyric acid is added, a catalyst is dropwise added, and the heat insulating reaction is performed for a period of time; S4,content of NCO in a system is detected, when content of NCO reaches 1.5%-4.0%, 50-80 parts of epoxy resin E-51 is added, then 10-20 parts of hydrogen peroxide is added, the heat insulating reaction is performed for a period of time, and 300-400 parts of acetone is added for reducing viscosity; S5, cooling is performed, caustic soda is added for neutralization, an emulsifier is added for emulsification, and acetone is removed from the system through vacuum pumping. The anionic water-borne epoxy resin emulsion prepared with the method is milky white and fine in appearance, excellent in storagestability, mechanical stability and freeze-thaw stability, good in water resistance, high in hardness and high in adhesive force.

Description

technical field [0001] The invention relates to the technical field of water-based resins, in particular, the invention relates to an anionic water-based epoxy resin emulsion and its preparation method and application. Background technique [0002] Most of the current epoxy resins are solvent-based, which are used in many construction sites. Epoxy resins are insoluble in water, and a large amount of organic solvents such as ketones and aromatic hydrocarbons need to be added as diluents. They have a strong odor and are easy to volatilize, causing great harm to the surrounding environment. big pollution. As people pay more and more attention to the environment and have higher requirements for environmental protection, more and more attention has been paid to the research on waterborne epoxy resin, especially the research on low VOC and no volatile organic compounds. Water-based epoxy resins are mostly emulsified by adding emulsifiers or chemically modifying the resin by phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C09D5/16C09D7/61C08G18/58C08G18/42C08G18/34C08G18/76C08G18/75C08G18/32C08G18/66
CPCC08G18/0823C08G18/3206C08G18/348C08G18/4045C08G18/4277C08G18/58C08G18/664C08G18/724C08G18/755C08G18/7614C08K3/34C08K3/346C08K2003/2241C09D5/1662C09D5/1687C09D175/06
Inventor 张胜王振兴
Owner GUANGZHOU LEOBO PAINT TECH
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