Expanded Graphite for battery and coating and addative
Expanded Graphite for battery and coating and addative，Dry graphite flakes shape expandable graphite
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Graphite crystal has a hexagonal planar layered structure composed of carbon elements. The carbon atoms on the plane of the layers are strongly covalently bonded, and the layers are weakly bonded by van der Waals forces, and the distances between the layers are large. Graphite Intercalation on Compounds (GIC), a new chemical phase, can be formed when a variety of chemicals, including acids, alkali metals and salts, are inserted between Graphite layers and combine with carbon atoms under appropriate conditions.
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When heated to an appropriate temperature, this interlaminar compound can be rapidly decomposed in an instant, producing a large amount of gas, which causes the graphite to expand along the axis into a worm-like new material, that is, expanded graphite. This unexpanded graphite interlaminar compound is expandable graphite.
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Expandable graphite was first discovered by German Schaufautl. In 1841, Schaufautl soaked natural graphite in a mixture of thick HNO3 and thick H2SO4. After several hours of drying, it was found that graphite had expanded. United carbide first applied for the patent of expandable graphite manufacturing technology in 1963 and carried out industrial production in 1968.
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The flexible graphite is a new type of high performance sealing material, which is a kind of nano material growing in situ. Compared with traditional sealing materials such as asbestos and rubber, it has good compressibility, resilience, self-adhesion, low density and other excellent properties, and can be used for a long time under harsh working conditions such as high temperature, high corrosion.
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It is widely used in aerospace, machinery, electronics, nuclear energy, petrochemical, electric power, ships, smelting and other industries. Because it has light weight, electrical conductivity, heat conduction, high temperature resistance, acid and alkali corrosion resistance, good resilience, lubricity, plasticity and chemical stability and other excellent characteristics, known as the world's "king of seals".
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In the field of environmental protection, the expandable graphite obtained by high temperature expansion has rich pore structure and excellent adsorption performance, so it has a wide range of applications in environmental protection and biomedical. The pore structure of expandable graphite can be divided into open pore and closed pore, with the pore volume accounting for about 98%, and the large pore is the main one, with the pore diameter ranging from 1 to 10.3 nm. Since it is mainly composed of macroporous and mesoporous materials, its adsorption characteristics are different from those of activated carbon and other microporous materials. It is suitable for liquid phase adsorption but not for gas phase adsorption.
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The initial raw materials prepared by chemical intercalation method are high-carbon flake graphite, and other chemical reagents such as concentrated sulfuric acid (98% or more), hydrogen peroxide (28% or more), potassium permanganate are all industrial grade reagents. Preparation of general steps as follows: in the appropriate temperature, the different ratio of sulfuric acid and hydrogen peroxide solution, natural flake graphite with different to join the program, constantly stirring reaction under a certain time, and then washed to neutral, centrifugal separation, dehydration, 60 ℃ after vacuum drying.
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It is oil-wet and hydrophobic in liquid phase adsorption. 1 g of expandable graphite can absorb more than 80 g of heavy oil, so it is a promising environmental protection material to remove oil pollution on the water surface. In the wastewater treatment of chemical enterprises, microorganisms (bacteria) are often used for treatment. Expandable graphite is a good microbial carrier, especially in the water treatment contaminated by organic macromolecules such as oil. Due to its good chemical stability and renewable reuse, it has a good application prospect.
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Due to the adsorption properties of expandable graphite to organic and biological macromolecules, medicine has a wide application prospect in biomedical materials. As a battery material, expandable graphite is transformed into electric energy by the free energy changes of the interlayer reaction of expandable graphite. Generally, expandable graphite is used as the cathode, lithium as the anode, or expandable graphite composite silver oxide as the cathode and zinc as the anode. Fluorofossil ink, graphic acid and expandable graphite of metal halides such as AuCl3 and TiF4 have been used in batteries.
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