GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE
Fluorographite polymer
CAS: 11113-63-6
Molecular Formula: CH4F2
GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE - Names and Identifiers
GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE - Physico-chemical Properties
| Molecular Formula | CH4F2 |
| Molar Mass | 54.04 |
| Melting Point | 300°C (dec.) |
| Vapor Presure | 362000mmHg at 25°C |
| Storage Condition | RT, dry |
| Use | For high-energy primary battery cathode materials and solid lubricating materials |
GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE - Risk and Safety
| WGK Germany | 3 |
GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE - Nature
Open Data Verified Data
white powder. From the structural point of view, fluorine enters between the six carbon ring flat layer of graphite and is similar to graphite, so it is called fluorinated graphite. The chemical composition and crystal structure vary with the reaction temperature and the crystal structure of the raw materials. Density d (CF). 2.58g/cm3;d (F C2). 2. 79g/cm3. In addition to concentrated alkali, hot concentrated sulfuric acid, it is not easy to be other acid and alkali corrosion. The solvent resistance and weather resistance are good. The surface is hydrophobic. Due to the introduction of fluorine, carbon-fluorine bond energy is very large, high temperature, high pressure and different gas medium is difficult to be cut off, so that it is at high temperature, high speed, under high load conditions, the performance is better than that of graphite or molybdenum disulfide, and the lubrication performance of graphite in the absence of water vapor is improved. Non-toxic, non-flammable, non-corrosive, chemically stable, is a good high-energy electrode materials, insulating materials, waterproof materials, lubricating materials.
Last Update：2024-01-02 23:10:35
GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE - Preparation Method
Open Data Verified Data
obtained by direct fluorination of carbon or graphite with elemental fluorine at 300-600 °c. Alternatively, an electrolysis method using graphite as an anode and hydrofluoric acid as a cathode is used.
Last Update：2022-01-01 09:06:37
GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE - Use
Open Data Verified Data
graphite fluoride is a new type of functional material, which is hydrophilic and lipophilic, and its unique feature is high lubricity. Used as high-temperature solid lubricants, high-energy lithium battery cathode materials and new conductivity materials. Graphite fluoride has better wear resistance than graphite or molybdenum disulfide. In dry, humid atmosphere and at high temperature (400~500 ℃), the friction coefficient is small, the friction life is long, and it has good thermal stability and chemical stability, in almost all the atmosphere can maintain good lubrication characteristics, especially suitable for high temperature, high pressure, high speed, high load and corrosive media and other harsh conditions. The composite material made of fluorinated graphite, rubber and plastic can produce various self-lubricating bearings and seals, which is suitable for high temperature and high speed applications.
Last Update：2022-01-01 09:06:37
GRAPHITE, FLUORINATED, POLYMER, LOW FLUO RINE - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| general situation | fluorinated graphite is one of the research hotspots of new carbon/graphite materials with high technology, high performance and high efficiency in the world. its excellent performance and unique quality are a wonderful flower in the functional material family. |
| color | fluorinated graphite is an inorganic polymer powder from gray to white. many scholars believe that the ratio of fluorine to carbon in fluorinated graphite varies from 0.5 to 1.2 depending on the reaction conditions, and the color of the product also changes from gray to white. |
| synthesis process | 1, direct synthesis process. Graphite and gas fluorine are synthesized by heating in a reactor at 350~600 ℃. The earliest synthesis method is used. The equipment is a vertical vibration reactor or fluorination device, which can automatically control the heating temperature, the feed of fluorine gas and inert gas. 2. catalyst synthesis process. Trace metal fluorides (LiF, MgF2, AlF3 and CuF2) are added to the reaction system of graphite and fluorine as catalysts, and the synthesis can be carried out below 300 ℃. Due to the addition of trace metal fluorides, the properties of fluorinated graphite have changed and the conductivity has increased by an order of magnitude. It is required that the purity of graphite and fluorine gas are above 99.4%, and the purity of catalyst is greater than 98%. The equipment used is the same as the direct synthesis method. 3. Solid fluoride synthesis process. The gas fluorine used in the above two methods is extremely toxic and corrosive, and the reaction requires high temperature. The solid synthesis process uses fluorine-containing solid polymers (such as polymers made of tetrafluoroethylene, hexafluoropropylene, polyvinyl acetate fluorite, vinyl fluorite, etc.) and graphite. Under inert atmosphere such as helium, neon, argon, and nitrogen, fluorinated graphite is prepared by heating to 320~600 ℃ in a quartz tube in a tubular electric furnace. The principle process flow is shown in Figure 10-20. Graphite is mixed with aqueous suspension and polytetrafluoroethylene in a ratio of 1:10, then filtered and dried into a tubular electric furnace for heating, and taken out for 30min to 1h for cooling. 4, electrolytic synthesis process. By electrolysis, graphite is electrolyzed in anhydrous hydrofluoric acid to generate new fluorinated graphite. That is, in the electric field, between the anode and the cathode, the graphite and hydrofluoric acid are cyclically electrolyzed to generate fluorinated graphite. The electrolysis device consists of anode and cathode made of nickel plate, circulating pipe and circulating pump, porous partition made of polytetrafluoroethylene, exhaust pipe, DC power supply, etc. Graphite and hydrofluoric acid suspensions are contained in the electrolysis area of the two electrodes, and they flow in a closed circuit under the action of a circulating pump. In the suspension, the graphite solid content is 10%, the hydrofluoric acid contains 1% water, the temperature in the argon atmosphere electrolytic cell is -20 ℃, the applied voltage is 8V, and the average current density is 5A/cm2. The distance between the two plates is about 5mm. After the partition is placed between them, the distance between the anode and the cathode is 2mm and 3mm respectively, forming a closed loop between the partition and the partition. After the reaction is completed, the hydrofluoric acid suspension containing graphite is discharged and filtered to separate the fluorinated graphite, the liquid is returned for reuse, and a new suspension to be reacted is added while discharging. |
| crystal structure | Japan's Nobuharu Watanabe proposed that there are only two types of fluorinated graphite (CF)n and (C2F)n. Chemical analysis shows that the fluorocarbon ratio is 0.58~1.2. The result is that the ratio of (CF)n to (C2F)n in the product is different due to different reaction conditions, as well as a certain amount of = C and-CF3 adsorbed at the edge of the carbon layer, fluorinated graphite is a hexagonal layered structure. Fluoride graphite is an interlayer compound synthesized by fluorine and graphite. Compared with graphite, its electronic structure and lattice constant have changed. The crystal structure of fluorinated graphite is shown in the figure below. The C- C bond length in fluorinated graphite is expanded from 0.142nm of the C- C bond length of graphite to 0.152nm. At the same time, due to the electronegativity of fluorine atoms, the interlayer distance of fluorinated graphite is expanded from 0.336nm of graphite to 0.708nm, which makes it a typical molecular crystal linked by van der Waals force. Due to the instability of van der Waals radius and the different degree of fluorination, it is reported in the literature that the fine layer spacing of fluorinated graphite is 0.6~0.9nm. |
| properties | 1, good chemical resistance. Chemical corrosion resistance is better than polytetrafluoroethylene at room temperature. It is also stable to concentrated sulfuric acid and concentrated nitric acid and is insoluble in various organic solvents. But hot concentrated sulfuric acid and hot alkali have a certain invasion of it, and react with alkali metals and alkali halogen compounds at high temperatures to form fluorinated alkali and amorphous carbon. 2. good thermal stability (only a small amount of weight loss occurs when it is higher than 500 ℃). 3. good lubricating performance, the friction coefficient of grease and solid lubricants (molybdenum disulfide, graphite, etc.) is the lowest. within 27~344 ℃, the friction coefficient is only 0.10~0.13. 4, good electrical insulation,(CF)n resistance rate of 3 × 103 Ω/cm or more. 5, Mohs hardness of 1.0~2.0 6, particle size distribution is very wide, from less than 1μm to more than several millimeters. appearance: gray powder thickness:<10nm sheet diameter: 0.5-10 μm fluorine content: 50-60wt% |
| apply | 1 as solid lubricant. The bonding energy between fluorinated graphite layers is extremely small, 8.4kJ/mol, has excellent lubricity, is not affected by oxidation, reduction, vacuum and other atmospheres, and can be used in a wide range from low temperature to high temperature. Its friction coefficient is smaller than that of butter, and it is an excellent lubricating material. 2. As a battery active substance. The battery made of graphite fluoride as a battery active material has high voltage (nominal voltage is 3V), high energy density, excellent storability and wide use temperature range. 3. Application of low surface energy substances. In the plywood manufacturing process, the use of fluorinated graphite coating can prevent the adhesion of the binder and prolong the clean treatment cycle. 4. a small amount of fluorinated graphite can prevent liquid from being soaked in porous materials. When electroplating metal, the surface of the electrode co-precipitated graphite fluoride does not produce substance adhesion, and this electrode only electrolyzes the non-aqueous system when electrolyzing water and non-aqueous solvent mixture. high temperature solid lubricant, cathode material of high-energy lithium battery and new conductivity material, etc. |
| Use | Used as cathode material and solid lubricating material for high-energy primary batteries |
| production method | 1. carbon or graphite and elemental fluorine are directly fluorinated at 300~600 ℃. Or adopt the electrolysis method with graphite as the anode and fluorohydroacid as the cathode. 2. It is obtained by direct fluorination reaction of carbon or graphite and elemental fluorine at 300~600 ℃. |
Last Update：2024-04-10 22:29:15
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CAS: 11113-63-6
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QQ: 3008007409
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CAS: 11113-63-6
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
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