Graphene
Size
1-2nm thick x 0.5-5microns wide
Package
According to customer requirements
Features
High strength, high electrical conductivity, etc.
Application
Can be used as filler(between 0.01% and 5%).
Graphene, as the thinnest, toughest and best conductive nano material found at present. It is a two-dimensional crystal composed of carbon atoms stripped from graphite material with only one layer of atom thickness. Known as “black gold”, it is “the king of new materials”. Scientists even predicted that graphene “will completely change the 21st century”.
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In recent years, graphene is widely used，and with the rapid development of modern science and technology, conductive coatings as a new type of special functional coatings are widely used in power transmission equipment, petrochemical industry, electronic and electrical, aerospace, and other fields.
Conductive coatings can be used to eliminate the static charge and conduction current in the substrate and form a protective layer on the surface of the substrate, which can effectively prevent the corrosion medium from breaking the substrate. It has good conductivity, corrosion resistance, electromagnetic shielding, and adhesion. It is considered to be an important direction of the development of powder coatings and has a broad market prospect.
According to the different conductive mechanisms, conductive coatings can be divided into the intrinsic type and doped type. Intrinsic conductive coatings take conductive polymer as the basic film-forming material, without adding other conductive fillers, such as polyaniline, polyacetylene, and polypyrrole. Due to the small variety, it is difficult to purify and apply these materials, so their application is limited;
The doped conductive coating is a kind of conductive coating which is made of the non-conductive polymer as film-forming resin and filled with strong conductive materials. Filler is the key part to determine the performance of the conductive coating system.
At present, there are three kinds of conductive fillers: carbon, metal, and metal oxide, among which carbon is the most widely used conductive filler. As a new type of two-dimensional layered carbon material, graphene has a high aspect ratio, excellent hydrophobicity, thermal conductivity, and chemical stability. The conjugated system has strong electronic conductivity and excellent conductivity. It is considered to be the best choice for the preparation of conductive coatings.
Graphene has many excellent physical and chemical properties due to its special crystal structure. The theoretical resistivity of single-layer graphene is about 10-6 Ω· cm, which is the lowest resistivity material at present. Graphene as filler can effectively improve the conductivity of coatings. In addition, two-dimensional lamellar graphene is arranged in parallel in the coating, which can play a physical isolation role in the coating, hinder the penetration of water, oxygen, and other corrosive ions to metal materials, and improve the corrosion resistance of the coating. The close combination of graphene and resin can improve the mechanical properties of the coating. Graphene has been widely studied and applied in the conductive coatings industry due to its special physical structure and surface characteristics.
