Expandable Graphite
Size
0.50mm or 0.106mm, etc
Package
25 kg small bags into ton bags
Origin
China
Features
Preservative/Electrical and thermal conductivity, etc.
Application
Fireproof sealing element, flame retardant, refractory brick, etc.
Expandable graphite crystal is a typical layered carbon material. Other heterogeneous particles such as atoms, molecules, ions, and even atomic clusters are inserted into the interlayer of crystalline graphite by physical or chemical methods to form a new layered compound, which is called graphite interlayer compound, namely expandable graphite.
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Expandable graphite has many excellent properties, as a new functional material, such as low density, light weight, high and low temperature resistance, non-toxic and harmless, environmental protection and energy saving, and is recognized as one of the most valuable and promising products among carbon materials. one. In the future, with the continuous optimization and upgrading of the industrial structure in traditional application fields and the vigorous development of strategic emerging industries such as energy conservation and environmental protection, new energy, high-end equipment manufacturing, and new materials, the consumption of the expanded graphite industry will continue to increase and the prospects are broad.
Expandable graphite’s applications for different fields
(1) Absorption for waste water and harmful gas: The interior of expanded graphite is dominated by large pores, which creates conditions for multi-molecular layer adsorption and even condensation in the pores. It can be used to adsorb macromolecular organic matter in wastewater, and the effect is better than other adsorption materials such as activated carbon with small pores. Therefore, It is often used in the treatment of oil or organic non-polar wastewater, and is an ideal material for environmental restoration of oil spills and chemical spills. Expanded graphite can be used not only for liquid phase adsorption, but also for the adsorption of harmful gases in the environment.
(2) High energy battery field: With the development of new energy vehicles, the world’s demand for high-energy batteries is increasing, and the application of expanded graphite in the field of high-energy batteries is becoming more and more extensive, especially in the research of super batteries with characteristics of extremely fast charging and high cycle charging rate Among them, expanded graphite plays a vital role. The fuel cell bipolar plate made of expanded graphite can separate the reactant gas and lead the reactant gas into the fuel cell at the same time. In addition, expanded graphite composites can also be used as an alternative material for the negative electrode of lithium-ion batteries.
(3) Flame retardant sealing field: Expanded graphite, as a non-toxic and non-polluting flame retardant, can be used in combination with other flame retardant materials, which can significantly improve the stability and flame retardant effect of the flame retardant. Expanded graphite can significantly improve the thermal stability and flame retardancy of materials such as polypropylene (PP) and cyclotriphosphazene (HPHPCP), and PP/EG and HPHPCP/EG composites will generate an expanded carbon layer after combustion, making the flame Isolate the air and extinguish quickly, and at the same time, the expanded carbon layer is tightly covered on the surface of the sample, which plays a good role in heat insulation, oxygen insulation, and flame retardancy. In addition, the acid groups between the expanded graphite layers are released during expansion, which promotes the carbonization of the protected material. Studies have shown that acidified expanded graphite has better flame retardancy and tensile properties.
(4) Refractory field: BEHERA et al. used expanded graphite to replace graphite and carbon black in Al2O3-C refractory slides, and the cold and hot strength and oxidation resistance of the prepared new refractory material were significantly enhanced, indicating that expanded graphite can strengthen and improve the refractory properties of materials by absorbing and storing heat energy. sex.
(5) Nuclear industry: Thermally expandable graphite (TEG) can improve the mechanical properties of cement compounds used for radioactive waste oil solidification, solidify waste oil at a mass ratio of 1:20, and significantly improve the solidification effect of radioactive waste oil produced in the nuclear industry. At present, thermally expandable graphite is one of the very few minerals used to achieve the desired effect of curing radiation.
(6) Expanded graphite dressing: Because expanded graphite has a strong adsorption capacity for organic and biological macromolecules, expanded graphite has broad application prospects in biomedical materials. In animal experiments using expanded graphite instead of medical dressings (medical gauze), it has been shown that expanded graphite dressings have no toxic and side effects such as blackening and irritation to the wound surface, and can promote wound healing. The relevant results of clinical trials conducted in four hospitals including the Hospital of the First Military Medical University also showed that the effect of expanded graphite dressing is better than that of traditional gauze drainage, and has obvious anti-infection, antibacterial and anti-inflammatory effects.
(7) Military field: EG composite smoke agent uses the thermal expansion generated when pyrotechnic powder explodes, and disperses in the predetermined airspace to form expanded graphite-type aerosol interference clouds, and then forms certain interference in the range from visible light to millimeter waves. In modern warfare, the application of mechanization and automation has improved combat efficiency and shortened the response time of combat departments.
With the continuous improvement of science and technology and scientific research, expanded graphite and expanded graphite composite materials are continuously used in strategic emerging fields. In this regard, the Franli factory will continue to improve the preparation method of expanded graphite, and explore more efficient, low-consumption, and environmentally friendly preparation methods and modification methods at normal temperature and pressure, so as to better realize the high-efficiency, environmental protection, and low-energy consumption of expanded graphite. Production, and further broaden its scope of application and field.
