Graphene composite conductive coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of conductive coatings, and discloses a graphene composite conductive coating as well as a preparation method and application thereof. The coating is composed of the following materials: 5-80% of resin, 0.1-5% of graphene, 2.5-20% of copper powder, 7.2-30% of silver powder, 0.55%-3.0% of a dispersant, 17-40% of an organic solvent, 0.3-1% of an anti-settling agent, 0.3-1% of a levelling agent and 0.1-1% of a cross-linking agent; and the preparation method comprises the following steps: adding the graphene into a slowly-drying solvent, adding the dispersant, performing stirring, and performing ultrasonication; adding the ultra-fine copper powder into a slowly-drying solvent, adding the dispersant, performing stirring, and performing ultrasonication; adding the ultra-fine silver powder into a slowly-drying solvent, adding the dispersant, performing stirring, and performing ultrasonication; and adding the dispersant into acrylate polyurethane, adding the treated solutions into the acrylate polyurethane in sequence, adding the organic solvent, the anti-settling agent, the levelling agent and the cross-linking agent, performing stirring, and performing grinding. The coating provided by the invention meets the requirements of conductive performance, avoids the single use of silver, reduces costs, and has a high price / performance ratio.

Description

technical field [0001] The invention belongs to the technical field of conductive coatings, in particular to a graphene composite conductive coating and its preparation method and application. Background technique [0002] Conductive coatings are special functional coatings. It can be used in various military and civilian industrial fields such as electronics, electrical appliances, aviation, chemical industry, and printing. By spraying or brushing, the conductive coating makes the completely insulated non-metal or non-conductive surface have the characteristics of absorbing, conducting and attenuating electromagnetic waves like metal, so as to shield electromagnetic interference. The unique stable lattice structure of graphene makes graphene have excellent electrical, thermal and mechanical properties. The theoretical Young's modulus of graphene reaches 1.0TPa. The thermal conductivity of pure defect-free single-layer graphene is as high as 5300W / m·K, which is the carbon...

AI Technical Summary

Problems solved by technology

Although the existing graphene and its composite materials and technologies have begun to carry out scientific research experiments in many fields, and some progress has been made in the experimental data, they have not yet achieved a good conductive effect, and the process is complicated and the cost is high.

The high specific surface area of ​​graphene ultrafine material leads to too much force between molecules, which makes it easy to agglomerate and is not easy to disperse evenly, which affects the excellent performance of graphene ultrafine material

[0003] To sum up, the existing problems in the prior art are: although the existing graphene and its composite materials and technology have begun to carry out scientific research experiments in many fields, and some progress has been made in the experimental data, they have not yet achieved a good conductive effect, and the process complex and costly

It is not easy to disperse evenly, which affects the excellent performance of graphene ultrafine materials and further affects the performance of graphene products

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