Preparation method of waterborne epoxy-modified graphene oxide nano composite coating

A nano-composite coating, water-based epoxy technology, applied in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems affecting the anti-corrosion performance of graphene oxide/polymer nano-coating and weak polymer interface interaction , prone to agglomeration and other problems, to achieve the effect of promoting compatibility and dispersion, increasing interaction, and strong repeatability

Pending Publication Date: 2022-05-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a strong van der Waals force between the graphene oxide sheets, which has poor dispersion in the polymer, is prone to agglomeration, and has problems such as weak interaction with the polymer interface, which greatly affects the oxidation process. Anticorrosion properties of graphene / polymer nanocoatings

Method used

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  • Preparation method of waterborne epoxy-modified graphene oxide nano composite coating
  • Preparation method of waterborne epoxy-modified graphene oxide nano composite coating
  • Preparation method of waterborne epoxy-modified graphene oxide nano composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of graphene oxide aqueous dispersion, specifically:

[0039] Weigh 1.82 g of graphene oxide filter cake (solid content 44%, sheet diameter 10-30 μm, thickness 0.5-1 nm), add it to 80 ml deionized water, and prepare a uniform graphene oxide water dispersion in an ice-water bath by ultrasonication for 1 h. The concentration is 10mg / ml.

Embodiment 2

[0041] The preparation method (chemical modification) of modified graphene oxide dispersion liquid is specifically:

[0042]The PBS damping fluid of 200ml PH5.5 is joined in the 500ml there-necked flask, and in ice-water bath, add 3.1g 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and 0.46g N-hydroxysuccinimide compound (NHS), stirred for 15min until fully dissolved. Then slowly add 80ml of graphene oxide aqueous dispersion (10mg / ml) (graphene oxide filter cake has a solid content of 44%, sheet diameter of 10-30μm, thickness of 0.5-1nm), and continue stirring in an ice bath for 12h. Then add PBS buffer (pH14) to adjust the pH to 7.4, then add 5g of polyetheramine PEA (D400) and stir at room temperature for 4h, centrifuge and wash until the supernatant is neutral, and redisperse in deionized water to prepare a 10mg / ml modified Graphene oxide dispersion.

Embodiment 3

[0044] The preparation method of aqueous epoxy / modified graphene oxide composite emulsion and composite film is specifically:

[0045] Get the modified graphene oxide aqueous dispersion 1.6ml, 2.7ml, 3.7ml, 5.3ml prepared in Example 2 and join respectively in a 100ml three-necked flask, and add 10g water-based epoxy emulsion (PZ3961-1 bisphenol A type, Concentration 53wt%) and an appropriate amount of deionized water to adjust the system concentration to 20wt%, and continue at room temperature for 2 hours until uniform, to obtain a water-based epoxy / modified graphene oxide composite emulsion. Then add 2.18 g of curing agent (Aradur 3986 aliphatic amines, concentration 80wt%) according to the ratio (waterborne epoxy resin: curing agent = 1: 0.33) and stir for 1 hour. After mixing evenly, pour the composite emulsion into a glass mold and dry at room temperature 48h to obtain a water-based epoxy / modified graphene oxide composite film. According to the amount of modified graphene...

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Abstract

The invention discloses a preparation method of a waterborne epoxy-modified graphene oxide nano composite coating, and belongs to the field of high polymer material modification. According to the invention, polyether amine is utilized to modify graphene oxide, and through ring-opening reaction of polyether amine and water-borne epoxy resin, interfacial interaction between graphene oxide and water-borne epoxy resin is enhanced, and dispersibility and compatibility of graphene oxide in water-borne epoxy resin are improved; the mechanical property of the water-borne epoxy resin and the anti-corrosion and barrier properties of a coating are improved, and the water-borne epoxy resin has a very good application prospect in the heavy-duty anti-corrosion fields of automobiles, ships, pipelines, containers, storage tanks and the like.

Description

technical field [0001] The invention relates to a preparation method and application of a modified graphene oxide aqueous dispersion, and belongs to the field of polymer material modification. Background technique [0002] Water-based epoxy resin coatings have good corrosion resistance, chemical resistance and adhesion. At the same time, water is used as the dispersion medium, which also has the advantages of environmental protection. The film-forming substances mainly include epoxy resin with epoxy groups, Composed of curing agents (amines, acid anhydrides, etc.), its coating protection technology is a common means of corrosion protection for metal materials in China. However, in practical applications, there is still a big gap between water-based epoxy coatings and solvent-based coatings in various aspects of performance. For example, the construction process is difficult, and more microporous defects are generated during curing to reduce anti-corrosion performance, etc., ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D7/62C09D5/08
CPCC09D163/00C09D7/62C09D5/08C08K9/08C08K9/04C08K3/042
Inventor 张胜文徐正午郭佳美白绘宇王玮东为富
Owner JIANGNAN UNIV
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