Time:2023.06.15Browse:1
Flake graphite is a non-metallic mineral with unique physical and chemical properties such as high temperature resistance, oxidation resistance, corrosion resistance, thermal shock resistance, high strength, good toughness, high self-lubricating strength, strong thermal conductivity and conductivity. The graphite series products are mainly used in industries such as metallurgy, machinery, electronics, batteries, chemicals, light industry, military industry, national defense, aerospace, refractory materials, etc. Flake graphite is an essential non-metallic material for modern high-tech applications.
What are the characteristics of flake graphite? Let's take a brief look together.
The flake graphite sheet is thin and has good toughness, excellent physical and chemical properties, good conductivity, conductivity, thermal shock resistance, corrosion resistance, etc.
What are the applications of flake graphite? Let's take a brief look together.
1. Refractory materials. Flake graphite is widely used as structural refractory materials and coatings in the metallurgical industry, such as magnesia carbon bricks, crucibles, etc. Desulfurization accelerator in smelting industry, pencil lead in light industry, carbon brush in electrical industry, electrode in battery industry, catalyst in fertilizer industry, etc. After deep processing, flake graphite can also produce graphite emulsion, which is used for lubricants, release agents, wire drawing agents, conductive coatings, etc. The utility model can also produce expanded graphite, which is used as a raw material for flexible graphite products, such as flexible graphite seals and flexible graphite composite materials.
2. Coatings. Scale graphite can be used as a functional filler for Chinese coatings, mainly including anti-corrosion coatings, fireproof coatings, and conductive coatings.
Anti rust primer and anti-corrosion materials made of carbon black, talc powder, oil, etc., have good resistance to chemical and solvent corrosion; Adding chemical pigments such as zinc to the formula provides better rust prevention effect.
Expanded graphite is a Graphite intercalation compound made of natural graphite flakes by chemical or electrochemical treatment, which is a kind of fireproof filler. Under heating conditions, the expandable graphite rod rapidly expands in volume, suffocating the flame and generating expanding substances, achieving the function of isolating the flame, delaying or interrupting flame propagation. It is also non combustible, has good softness, high surface energy, and good carbonization layer strength. However, it is necessary to choose a suitable volume and dosage for the expansion material. Experiments have shown that 150um particles, 30% expansion factor, and 5% dosage are the most suitable.
The flake graphite rod can be directly used as a carbon conductive filler or can be made into a composite conductive filler for conductive paint. However, due to the large amount of graphite flakes added, the performance of the coating becomes brittle, which limits its application and development to a certain extent. Therefore, corresponding measures should be taken to further develop and improve the conductivity of graphite, and effective methods should be taken to reduce the amount of graphite flakes added. Tianhua Chemical Machinery Research Institute has developed a high-temperature corrosion-resistant resin as the substrate, with large graphite flakes as the main aggregate, which has strong electrostatic conductivity, high body strength, and good wear resistance.