Aqueous graphene conductive coating material and preparation method therefor

Abstract

The invention provides an aqueous graphene conductive coating material. The aqueous graphene conductive coating material comprises the raw materials in parts by weight: 1-5 parts of expanded graphite,30-70 parts of water-soluble resin emulsion, 1-5 parts of supramolecular dispersant, 10-50 parts of water and 0.2-3.5 parts of other auxiliaries. According to the aqueous graphene conductive coatingmaterial provided by the invention, the dispersity of graphene in a water-soluble resin matrix is improved greatly; and due to large-flake-diameter graphene, properties of the graphene are better exerted, the framework of a three-dimensional conductive network is facilitated, properties such as electric conductivity, impact resistance, corrosion resistance and adhesive power of products are excellent, the large-scale popularization of industrialization is facilitated, and the application prospect is broad. Stripping and dispersing of the expanded graphite and preparing of the aqueous conductive coating material are completed only through one process link, i.e., high-pressure homogenizing without a grinding medium, so that the process is simple, the cost is low, conditions are moderate andcontrollable, and the whole preparation process is safe and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of graphene, and relates to a water-based graphene conductive paint and a preparation method thereof. Background technique [0002] With the rapid development of modern science and technology, the level of modern industry has advanced rapidly, and static electricity, as a potential hazard, still plagues industrial production and daily life. According to statistics, due to the existence of electrostatic discharge phenomenon, the US electronics industry loses up to 10 billion US dollars every year, and the annual loss caused by static electricity in the United Kingdom also reaches 2 billion pounds. Nearly half of the reasons for the substandard electronic components in Japan are due to static electricity. Static electricity also poses a great threat during the storage and transportation of oil and gas products in large chemical companies. Therefore, it is necessary to take scientific and effective protective m...

AI Technical Summary

Problems solved by technology

[0004] At present, there are endless reports on the preparation of water-based conductive coatings using graphene as a conductive filler, but in practical applications, the problem of graphene agglomeration has become the biggest constraint factor affecting its conductive performance in coatings.

Due to the large surface area of ​​graphene and the strong van der Waals force between the sheets, agglomeration and entanglement are very easy to occur, making it unstable to disperse. Therefore, simply adding graphene powder as a filler directly into the water-based paint has no effect. ideal

[0005] Although there are current studies to improve the dispersion effect of graphene by modifying graphene, the dispersion effect is still not good, and there are limiting factors such as complex process, high cost, and unsuitability for large-scale production, which affect the popularization and use of the product.

However, simple grinding and sanding methods, while dispersing graphene sheets, also damage the sheet diameter of graphene, which greatly affects the performance of graphene; there are also studies on the combined application of graphene and conductive carbon black, but due to The addition of carbon black is large and its black color is difficult to cover, which limits its application in coatings

More importantly, most of the existing methods use various types of finished graphene powders. The cost of the graphene composite coatings prepared in this way is too high, which makes the price of the prepared graphene modified coatings remain high and cannot make graphite Large-scale promotion of vinyl in coatings

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