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Graphene-modified waterborne epoxy coating curing agent as well as preparation method and application of curing agent

A water-based epoxy coating, graphene modification technology, applied in epoxy resin coatings, anti-corrosion coatings, coatings and other directions, can solve the problems of overlapping, graphene agglomeration, etc., to improve corrosion resistance, stable dispersion, improve The effect of interfacial adhesion

Active Publication Date: 2018-03-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Two of purpose of the present invention is to provide the preparation method of above-mentioned a kind of graphene-modified water-based epoxy coating curing agent, graphene and water-based epoxy coating curing agent have good compatibility in this preparation method, therefore solve the traditional Problems of graphene agglomeration and cascading in two-component waterborne epoxy coatings

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  • Graphene-modified waterborne epoxy coating curing agent as well as preparation method and application of curing agent

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Effect test

Embodiment 1

[0044] A graphene-modified water-based epoxy paint curing agent, which is prepared by the method comprising the following steps:

[0045] (1), dispersing graphene oxide in water to obtain a graphene oxide aqueous dispersion with a mass percentage concentration of 0.4%;

[0046] Described graphene oxide is the graphene oxide prepared by the improved Hummers method;

[0047] (2), in step (1) the obtained graphene oxide water dispersion liquid, add the surface modifier with terminal amino group and mix evenly, microwave heating to temperature is 50 ℃ to make the surface modification of graphene oxide and band terminal amino group After the reaction was completed, the reactant obtained was washed 3 times with deionized water to obtain a graphene derivative, which was then formulated into an aqueous solution of a 0.4% graphene derivative by mass percent concentration;

[0048] The surface modifying agent with terminal amino groups is polyethyleneimine with an average molecular wei...

Embodiment 2

[0065] A graphene-modified water-based epoxy paint curing agent, which is prepared by the method comprising the following steps:

[0066] (1), dispersing graphene oxide in water to obtain a graphene oxide aqueous dispersion with a mass percentage concentration of 1%;

[0067] Described graphene oxide is the graphene oxide prepared by the improved Hummers method;

[0068] (2), in the aqueous dispersion of graphene oxide with a mass percent concentration of 1% of the obtained step (1), add a surface modifier with an amino group and mix uniformly, and microwave heating to a temperature of 80° C. makes the graphene oxide React with the surface modifier for 60min. After the reaction is completed, the reactant obtained is washed 3 times with deionized water to obtain a graphene derivative, which is then prepared into an aqueous solution of a graphene derivative with a mass percentage concentration of 0.4% with water;

[0069] The surface modifier of the band-terminated amino group ...

Embodiment 3

[0086] A graphene-modified water-based epoxy paint curing agent, which is prepared by the method comprising the following steps:

[0087] (1), dispersing graphene oxide in water to obtain a graphene oxide aqueous dispersion with a mass percentage concentration of 0.2%;

[0088] Described graphene oxide is the graphene oxide prepared by the improved Hummers method;

[0089](2), adding a surface modifier with an amino group to the aqueous dispersion of graphene oxide with a mass percent concentration of 0.2% obtained in step (1) and mixing evenly, heating to a temperature of 80° C. to make the graphene oxide React with a surface modifier for 30 minutes to introduce amino groups on the surface of graphene oxide. After the reaction is completed, the resulting reactant is washed 3 times with deionized water to obtain graphene derivatives, which are then formulated with water to a concentration of 0.4% by mass. The aqueous solution of the graphene derivative of %;

[0090] The sur...

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Abstract

The invention discloses a graphene-modified waterborne epoxy coating curing agent as well as a preparation method and application of the curing agent. The preparation method comprises the following steps: firstly dispersing graphene oxide prepared by virtue of an improved Hummers method into water, so as to obtain graphene oxide dispersion liquid; and adding a surfactant with amino end groups, uniformly mixing, carrying out microwave heating to enable graphene oxide to react with the surfactant, adding a graphene derivative water solution into a waterborne epoxy coating curing agent, and uniformly mixing, so as to obtain the graphene-modified waterborne epoxy coating curing agent. The graphene-modified waterborne epoxy coating curing agent is applied to the preparation of a bi-component waterborne epoxy coating, and the neutral salt spray test time of a formed anticorrosive coating can reach 185-252 hours.

Description

technical field [0001] The invention relates to a graphene-modified water-based epoxy coating curing agent, a preparation method and its application in the preparation of two-component water-based epoxy coatings, belonging to the technical field of chemical industry. Background technique [0002] Traditional solvent-based anti-corrosion coatings contain a large amount of volatile organic compounds (VOC), most of which are flammable, explosive, toxic substances and carcinogens. With the enhancement of people's awareness of environmental protection and the continuous increase of the government's taxation on VOC (volatile organic compounds) emissions, it has become an inevitable development trend of the coatings industry to replace traditional solvent-based coatings with water-based anti-corrosion coatings. However, compared with solvent-based industrial coatings, there is still a certain gap in the anti-corrosion performance of water-based coatings, which has also become a tec...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08
CPCC08K3/04C08K9/04C08K9/08C09D5/08C09D163/00
Inventor 李静单文雯李振伟崔锦灿杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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