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Quick-drying room temperature curing waterborne epoxy resin curing agent and preparation method thereof

A water-based epoxy resin, room temperature curing technology, used in epoxy resin coatings, coatings, etc., can solve the problems of flash rust on metal bodies and the influence of coating stability, and achieve increased molecular weight, improved compatibility, and good emulsifying ability. Effect

Active Publication Date: 2011-11-23
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This curing agent has a short surface-drying time due to the introduction of a curing accelerator, but its hydrophilicity is increased by the neutralization of acetic acid to form a salt, and the presence of organic acids will easily cause flash rust on the metal body; When the addition of some basic pigments and fillers is used together, it will have a certain impact on the stability of the coating

Method used

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  • Quick-drying room temperature curing waterborne epoxy resin curing agent and preparation method thereof
  • Quick-drying room temperature curing waterborne epoxy resin curing agent and preparation method thereof
  • Quick-drying room temperature curing waterborne epoxy resin curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare raw materials according to the mass percentage of the total materials:

[0041]

[0042]

[0043] In a reactor equipped with reflux, heating and stirring devices, add epoxy resin E-51, bisphenol A and polyethylene glycol diglycidyl ether, raise the temperature to 95°C, add triphenylphosphine, and then slowly raise the temperature to Continue the reaction at 160°C for 4 hours at a constant temperature to obtain an intermediate product. Finally, add an appropriate amount of propylene glycol methyl ether and mix well.

[0044] Under the condition of 60-90°C, slowly add the intermediate product dropwise to the device containing excess diethylenetriamine within about 1 hour. After the dropwise addition, continue the reaction at constant temperature for 3 hours. After the reaction is complete, remove it by distillation under reduced pressure. Unreacted amine and propylene glycol methyl ether. When the temperature is raised to 60-90°C, slowly add deionized water...

Embodiment 2

[0054] Prepare raw materials according to the mass percentage of the total materials:

[0055]

[0056]

[0057] In a reactor equipped with reflux, heating and stirring devices, add epoxy resin E-51, bisphenol A and polyethylene glycol diglycidyl ether, raise the temperature to 100 ° C, add benzyl diamine, and then slowly raise the temperature to Continue the reaction at 170°C for 4 hours at a constant temperature to obtain an intermediate product. Finally, add an appropriate amount of propylene glycol butyl ether and mix well.

[0058] Under the condition of 60-90°C, slowly add the intermediate product dropwise into the device containing excess ethylenediamine within about 1 hour. After the dropwise addition, continue the reaction at constant temperature for 3 hours. After the reaction is complete, distill under reduced pressure to remove untreated Reaction of amines and propylene glycol butyl ether. Raise the temperature to 60-90°C, slowly add deionized water dropwise...

Embodiment 3

[0066] Prepare raw materials according to the mass percentage of the total materials:

[0067]

[0068] In a reactor equipped with reflux, heating and stirring devices, add epoxy resin E-51, bisphenol A and polypropylene glycol diglycidyl ether, raise the temperature to 90°C, add triphenylphosphine, and then slowly raise the temperature to 160°C , Continue the reaction at constant temperature for 4h to obtain an intermediate product, and finally add an appropriate amount of propylene glycol methyl ether and mix well.

[0069] Under the condition of 60-90°C, slowly drop the intermediate product into the device containing excess m-xylylenediamine within about 1 hour, continue the reaction at constant temperature for 3 hours after the dropwise addition, and distill under reduced pressure after the reaction is complete Unreacted amine and propylene glycol methyl ether were removed. When the temperature is raised to 60-90°C, slowly add deionized water dropwise and stir at high ...

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Abstract

The invention relates to the technical field of chemical paints and particularly discloses a quick-drying room temperature curing waterborne epoxy resin curing agent and a preparation method thereof. The method comprises the following steps: mixing liquid epoxy resins, polyether containing epoxy groups on both ends or the mixture of polyether containing epoxy groups on one end and polyether containing epoxy groups on both ends with a bisphenol compound to react at 150-200 DEG C under the action of a catalyst and generate an intermediate, then using the intermediate and amine to react, performing reduced pressure distillation to remove excess amine and the solvent, cooling the obtained resins to 60-90 DEG C, and dropwise adding deionized water to obtain the amber or light yellow quick-drying room temperature curing waterborne epoxy resin curing agent. The waterborne epoxy resin curing agent has simple production process flow, the surface drying time for curing the epoxy resin emulsion is shorter, and the working life is longer; and the epoxy resin film cured by using the curing agent has excellent performance. The waterborne epoxy resin curing agent is suitable for waterborne paints, waterborne adhesives and the like; and for example, the curing agent can be used as a flooring paint, an industrial protective paint and a furniture adhesive.

Description

technical field [0001] The invention relates to the technical field of chemical coatings, in particular to a fast-drying room temperature curing water-based epoxy resin curing agent and a preparation method thereof. Background technique [0002] Traditional epoxy resin coatings have the advantages of high adhesion, good abrasion resistance, excellent chemical and solvent resistance, and high hardness, and have been widely used in industry. As people's requirements for environmental protection become increasingly urgent and strict, the development of low-VOC (volatile organic compound) water-based resin systems and related coating products has become a new research direction. Waterborne epoxy resin coatings have the advantages of good performance, no pollution, easy cleaning of construction tools, and relatively low cost. They are the key development varieties of waterborne coatings; Modification occupies a large proportion. [0003] Chinese invention patent (publication nu...

Claims

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Application Information

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IPC IPC(8): C08G59/62C08G59/56C08G59/22C09D163/02
Inventor 刘娅莉王增伟惠海军匡伟
Owner HUNAN UNIV
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