Aqueous epoxy resin emulsion, preparation method thereof, cathode electrophoresis coating

A water-based epoxy resin and epoxy resin technology, applied in the field of coatings, can solve the problems of poor storage stability, poor compatibility of coatings, precipitation, uneven dispersion, etc., to achieve higher surface tension, better surface tension, and avoid dispersion. uneven effect

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  • Abstract
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  • Application Information

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Problems solved by technology

For example, the leveling agent can reduce the surface tension, and at the same time, it may cause shrinkage, pinholes and other coating defects, and may also cause problems such as poor compatibility and storage stability of the paint; in addition, adding additives is based on the mixture The form exists in the paint or paint film, and there are problems such as precipitation and uneven dispersion

Method used

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  • Aqueous epoxy resin emulsion, preparation method thereof, cathode electrophoresis coating
  • Aqueous epoxy resin emulsion, preparation method thereof, cathode electrophoresis coating
  • Aqueous epoxy resin emulsion, preparation method thereof, cathode electrophoresis coating

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preparation example Construction

[0079] Correspondingly, the embodiment of the present invention also provides a kind of preparation method of aqueous epoxy resin emulsion, comprises the following steps:

[0080] (1) Add epoxy resin, diisocyanate, polyether polyol and propylene glycol methyl ether acetate into the reaction vessel, and react under the condition of 100°C~120°C for 2 hours;

[0081] (2) After cooling down to 60°C, add dibutyltin dilaurate and butanone, and react under reflux for 2 hours at 60°C~80°C;

[0082] (3) Cool down to 60°C, add hydroxyl-terminated polyether-modified silicone or hydroxyl-terminated fluorine-containing organic polymer, cyclohexanedimethanol, butanone, and react under reflux for 4 hours at 80°C~85°C;

[0083] (4) When the isocyanate content is less than 0.5%, cool down to 50°C~55°C, slowly add triethylamine dropwise under stirring condition and keep it warm for 1 hour;

[0084] (5) After neutralization by sodium benzenesulfonate, add deionized water for emulsification, rai...

Embodiment 1

[0089] 1. Preparation of water-based epoxy resin emulsion

[0090] (1) Add 7% epoxy resin, 8% diisocyanate, 5% polyether polyol and 1% propylene glycol methyl ether acetate in the reaction vessel by weight percentage, and react under the condition of 100°C~120°C for 2 hours;

[0091] (2) After cooling down to 60°C, add 0.8% dibutyltin dilaurate and 4% butanone, and react under reflux for 2 hours at 60°C~80°C;

[0092] (3) Cool down to 60°C, add 1.2% polyether-terminated polyether-modified silicone, 5% cyclohexanedimethanol, and 2% methyl ethyl ketone, and react under reflux for 4 hours at 80°C~85°C;

[0093] (4) When the isocyanate content is less than 0.5%, cool down to 50°C~55°C, slowly add 3% triethylamine dropwise under stirring condition and keep it warm for 1 hour;

[0094] (5) After being neutralized by sodium benzenesulfonate, 57% deionized water was added for emulsification, the temperature was raised to 65°C~80°C, and the solvent was removed by vacuum for 4 hours to...

Embodiment 2

[0098] 1. Preparation of water-based epoxy resin emulsion

[0099] (1) Add 8% epoxy resin, 6% diisocyanate, 6% polyether polyol and 1.5% propylene glycol methyl ether acetate in the reaction vessel by weight percentage, and react under the condition of 100°C~120°C for 2 hours;

[0100] (2) After cooling down to 60°C, add 1% dibutyltin dilaurate and 3% butanone, and react under reflux for 2 hours at 60°C~80°C;

[0101] (3) Cool down to 60°C, add 2% fluorine-containing organic polymer with terminal hydroxyl groups, 4% cyclohexanedimethanol, and 3% butanone, and react under reflux for 4 hours at 80°C~85°C;

[0102] (4) When the isocyanate content is less than 0.5%, cool down to 50°C~55°C, slowly add 4% triethylamine dropwise under stirring condition and keep it warm for 1 hour;

[0103] (5) After neutralization by sodium benzenesulfonate, add 55% deionized water for emulsification, raise the temperature to 65°C~80°C, remove the solvent in vacuum for 4 hours, and prepare water-ba...

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Abstract

The invention discloses an aqueous epoxy resin emulsion. The aqueous epoxy resin emulsion is prepared from, by mass, 5-10% of epoxy resin, 5-10% of diisocyanate, 2-8% of polyether polyol, 0.5-2% of dibutyltin dilaurate, 2-8% of cyclohexanedimethanol, 1-2% of propylene glycol methyl ether acetate, 2-4% of triethylamine, 1-3% of sodium benzenesulfonate, 5-10% of butanone, 1-3% of hydroxyl-terminated polyether modified organosilicon or hydroxyl-terminated fluorine-containing organic polymer and 50-60% of deionized water. Organosilicon and the fluorine-containing organic polymer are adopted to modify the epoxy resin, so the aqueous epoxy resin emulsion keeps the excellent performances of original coatings, has reduced surface tension and stable performances, and can be widely applied. The invention also discloses a preparation method of the aqueous epoxy resin emulsion, and a cathode electrophoresis coating prepared through adopting the aqueous epoxy resin emulsion.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a water-based epoxy resin emulsion capable of preparing low interfacial tension coatings; the invention also relates to a preparation method of the water-based epoxy resin emulsion; the invention also relates to a low interfacial tension cathodic electrophoresis coating. Background technique [0002] Epoxy resin is widely used in coatings and other fields because of its excellent physical and chemical properties after curing. Among them, water-based epoxy resin not only has the excellent performance of epoxy resin, but also has the advantages of environmental protection, easy construction and coating, and low price with water as the medium. It is widely used in water-based and electrophoretic coatings and other fields. However, the cathodic electrophoretic coating prepared by the existing aqueous epoxy resin emulsion adopts a highly polar resin and a solvent with high surface tension as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/58C08G18/61C08G18/62C08G18/65C09D175/08C09D5/44
CPCC08G18/6674C08G18/48C08G18/58C08G18/61C08G18/6279C08G18/6511C09D5/4465C09D5/4488C09D175/08
Inventor 李文庄高睿杨波
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