An expandable graphite rod used as a fireproof filler i […]
An expandable graphite rod used as a fireproof filler is a graphite rod intercalation compound obtained by chemical or electrochemical treatment. Under the condition of heat, the expandable graphite rod swells and suffocates the flame, and at the same time generates an expansion product, which can isolate the flame, delay or interrupt the flame spread, and is itself non-combustible, has good softness, high appearance and good strength of the carbonized layer. However, the volume and amount of the expansion body should be selected appropriately. The test indicated that 150 μm particles, 30% expansion ratio, and 5% dosage were most suitable. The scale graphite rod can be directly used as a carbon conductive filler or a composite conductive filler for a conductive paint. However, due to the large amount of graphite rod scales added, the performance of the paint becomes brittle and its application is limited. Therefore, measures are taken to further improve the conductivity of the graphite rod and effectively reduce the amount of graphite rod scale added. Graphite rod scale anti-corrosion paint has the characteristics of corrosion-resistant medium penetration, small residual stress, good deformation resistance to base deformation, stable construction performance and long-term static conduction. It can be used for electrostatically conductive coating on the inner wall of crude oil storage tanks.
Graphite rod fine classification use:
The graphite rod is a hexagonal crystal carbon having a metallic luster. According to its source, it is divided into natural graphite rods and artificial graphite rods.
Graphite rod scales are a layered natural solid lubricant that is resource-rich and inexpensive. Graphite rod scales are crystallized, thin and good in toughness, excellent in physical and chemical properties, and have good conductivity, electrical conductivity, thermal shock resistance and corrosion resistance. The scale graphite rods are classified into high carbon graphite rods, medium carbon graphite rods and low carbon graphite rods according to the carbon content.
Scale graphite rods are widely used in electrodes for battery processes, refractories in the metallurgical industry, and lubricant sealing materials for the chemical industry. As a functional filler for paints, it is mainly used for fireproof paints, anticorrosive paints and conductive paints. As a preservative material, if a chemical pigment such as zinc yellow is added to the formulation, the anti-rust effect is better; and the anti-rust primer made of carbon black, talc powder and oil has good chemical and solvent corrosion resistance.
Graphite rods and graphite electrodes are made of different materials.
Graphite rods are non-metallic products. As a necessary pre-weld cutting consumable in carbon arc gouging cutting process, carbon, graphite and appropriate binder are extruded and baked at 2200 °C. It is made of a layer of copper after the section. It is resistant to high temperature, has good electrical conductivity and is not easy to be broken. It is suitable for cutting metal into a shape that meets the requirements.
The graphite electrode is mainly made of petroleum coke and needle coke, and the coal bitumen is used as a binder. It is made by calcination, compounding, kneading, pressing, roasting, graphitization and machining. It is used to discharge electric energy in the form of electric arc in the electric arc furnace. The conductor that heats and melts the charge can be divided into ordinary power, high power and ultra high power according to its quality index.