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Room-temperature quick-drying epoxy curing agent dispersion as well as preparation method and application thereof

An epoxy curing agent and curing agent technology, used in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of performance discount of curing agent, large amount of emulsifier, insufficient emulsion stability, etc., to achieve excellent Salt spray resistance, excellent salt spray resistance and adhesion, mild conditions

Active Publication Date: 2021-04-13
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the external emulsification method is that there is no chemical bond between the emulsifier and the curing agent, the stability of the formed emulsion is insufficient, and the amount of the emulsifier added is too much, accounting for 1 / 5 of the curing agent, which is not good for the subsequent use of the curing agent. It will be discounted, and it is not conducive to the quick drying of the system
It can also be seen from the above cases that the establishment of the current quick-drying system still has a lot of room for improvement

Method used

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  • Room-temperature quick-drying epoxy curing agent dispersion as well as preparation method and application thereof
  • Room-temperature quick-drying epoxy curing agent dispersion as well as preparation method and application thereof
  • Room-temperature quick-drying epoxy curing agent dispersion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0095] Implementation Case 1: Add 400g of diethylenetriamine to the reaction flask, preheat the temperature to 80°C, and gradually drop 140g of epoxy E51 and E20 mixed liquid (mass ratio 1:1) into the reaction flask using a peristaltic pump. Adding time lasts for 1 hour, continue to keep warm for half an hour, use vacuum pump to carry out reduced pressure distillation, remove excess amine, then add 50g propylene glycol methyl ether to the system for dispersion, and then use peristaltic pump to gradually drop 50g butyl glycidyl ether Put it into the reaction bottle, add dropwise for 1 hour, keep warm for half an hour, slowly add 3g of 2-cyclohexyl-1-hydroxyl-2-oxirane-amino-ethanesulfonate sodium A into the system, and discharge after 10 minutes of reaction. Stir mechanically with a disperser, add 200 g of water slowly, and obtain 568 g of curing agent dispersion after phase inversion.

[0096] Curing agent dispersion viscosity: 3700cP Particle size: 720nm Solid content: 56.0% ...

Embodiment example 2

[0097] Example 2: Add 320g of triethylenetetramine to the reaction flask, preheat the temperature to 80°C, and gradually drop 120g of epoxy E20 and E44 mixed liquid (mass ratio 1:2) into the reaction flask using a peristaltic pump. Adding time lasts for 1 hour, continue to keep warm for half an hour, use vacuum pump to carry out reduced pressure distillation, remove excess amine, then add 60g propylene glycol methyl ether to the system for dispersion, and then use peristaltic pump to gradually drop 80g phenyl glycidyl ether Put into the reaction bottle, add dropwise for 1 hour, keep warm for half an hour, put 25g 2-cyclohexyl-1-hydroxyl-2-polyethylene oxide-amino-ethanesulfonate sodium B (the polyethylene oxide structure contains 20 EO structure, molecular weight 500) was slowly added into the system, reacted for 10 minutes and discharged, mechanically stirred by a disperser, slowly added 200g of water, and 565g of curing agent dispersion was obtained after phase inversion.

...

Embodiment example 3

[0099] Example 3: Add 260g of diethylenetriamine to the reaction bottle, preheat the temperature to 80°C, add 180g of epoxy E12 and E51 mixed liquid (mass ratio 2:1) into the reaction bottle in five batches, and the total The time lasts for 1 hour, and the heat preservation is continued for 1 hour. Use a vacuum pump to carry out reduced pressure distillation to remove excess amine, then add 90g of acetone to the system for dispersion, and then use a peristaltic pump to shrink 100g of carbon dodecyl to carbon tetradecyl Glycerin ether is gradually dropped into the reaction bottle, the time of dropping is half an hour, and the temperature is kept for half an hour. Slowly add 15g of 2-cyclohexyl-1-hydroxy-2-oxirane-amino-ethanesulfonate sodium A into the system and react for 10 minutes After discharging, use a disperser to mechanically stir, slowly add 400g of water, and remove the acetone after phase inversion to obtain 765g of curing agent dispersion.

[0100] Curing agent disp...

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Abstract

The invention discloses a preparation method of a room-temperature quick-drying epoxy curing agent dispersion, which is characterized in that at least one sulfonate and at least one nonionic polyether structure are introduced into a curing agent structure, so that self-emulsification of a curing agent can be realized. The curing agent provided by the invention has the advantages of simple synthesis process, excellent salt spray resistance, quick drying at room temperature, stable particle size, low VOC (Volatile Organic Compound) and the like, and can be applied to, but not limited to, curing of epoxy dispersoid in the field of heavy corrosion protection, such as engineering machinery, rail transit and steel structures.

Description

Technical field: [0001] The invention relates to the field of water-based epoxy coatings, in particular to a room-temperature fast-drying epoxy curing agent dispersion, its preparation and application. Background technique: [0002] In the paint industry, because the solvent itself will cause great harm to the respiratory system, nervous system, etc., solvent-based paints have gradually faded out of the stage, and the market is developing towards high-solids and water-based paints. Compared with solvent-based coatings, water-based coatings are relatively deficient in many properties, which limits their popularization to a certain extent. [0003] Water-based epoxy coatings are mainly composed of two components: one component is epoxy water-based dispersion (ie emulsion), and the other component is curing agent, which is used to realize the curing and strength building of epoxy coatings. At present, waterborne two-component epoxy coatings have many applications in the market...

Claims

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Application Information

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IPC IPC(8): C08G59/50C09D163/00C09D5/08
CPCC08G59/504C09D163/00C09D5/08
Inventor 王晓纪学顺晋云全李卫飞曲瑞张成彬邓俊英孙家宽
Owner WANHUA CHEM GRP CO LTD
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