| Molecular Formula | C2H2F2 |
| Molar Mass | 64.0341 |
| Density | 0.95g/cm3 |
| Melting Point | −144 °C(lit.) |
| Boling Point | −83 °C(lit.) |
| Flash Point | <-60°C |
| Vapor Presure | 26200mmHg at 25°C |
| Vapor Density | 2.2 (vs air) |
| Refractive Index | 1.264 |
| Physical and Chemical Properties | The chemical properties are slightly ether odor, colorless, and combustible gas. Freezing point -144 ℃, boiling point -85.7 ℃, melting point -144.1 ℃, relative density 1.001(-45.3/4 ℃), liquid relative density 0.617. Soluble in ethanol and ether, slightly soluble in water. The critical temperature is 30.1 ℃, the critical pressure is 4.29MPa, and the critical density is 0.417g/cm3. The combustion limit in air is 5.5%-21.3%. |
| Use | It is mainly used as the monomer raw material of fluorine resin and fluorine rubber |
| Risk Codes | R12 - Extremely Flammable |
| Safety Description | S16 - Keep away from sources of ignition. S33 - Take precautionary measures against static discharges. S9 - Keep container in a well-ventilated place. |
| UN IDs | UN 1959 2.1 |
| WGK Germany | 3 |
| RTECS | KW0560000 |
| FLUKA BRAND F CODES | 4.5 |
| TSCA | T |
| Hazard Class | 2.1 |
| Toxicity | LCLo inhalation in guinea pig: 800ppb/4H |
A slightly ether-odorous, colorless, flammable gas. Boiling point -85.7 °c. Melting Point -144.1 °c. The relative density of the liquid was 0.617. Slightly soluble in water, soluble in ethanol and ether. The critical temperature is 30.1 ℃, the critical pressure is 4. 29MPa, and the critical density is 0.417g/cm3. The combustion limit in air is 5.5% ~ 21.3%.
can produce polyvinylidene fluoride (radiation resistant material), fluorine rubber and fluorine plastic, etc., can also be copolymerized with other monomers to prepare various copolymers and fluorine containing elastomers, such as oil resistant low temperature special rubber. Also used as a special solvent.
| explosion limit value (explosive limit) | 21.3% |
| BRN | 1733321 |
| (IARC) Carcinogen Classification | 3 (Vol. 39, Sup 7, 71) 1999 |
| EPA chemical information | Vinylidene fluoride (75-38-7) |
use
1,1, 1-difluoroethylene is mainly used to produce polyvinylidene fluoride. 1, 1-difluoroethylene is polymerized in a polymerization kettle with water as the medium, potassium persulfate as the initiator, and a buffer. The temperature is 50-95 ℃, and the pressure is about 3MPa. The powdered polymer obtained is the finished product after washing and drying. This is a product with high mechanical strength in fluoroplastics, which can be molded by general thermoplastic processing methods. It has excellent weather resistance, chemical stability, and heat resistance. It can be used as lining, anti-corrosion diaphragm, chemical machinery seals, gears, bearings, etc. for chemical pipelines, pipe fittings, valves, pumps and storage tanks. There are also many important uses in the electronic and electrical industry. It is also used as a special solvent.
2. Mainly used as monomer raw material for fluororesin and fluororubber
production method
1. undifluoroethane chloride method reacts with hydrofluoric acid in the presence of fluorosulfonic acid to generate 1,1-difluoroethane. after compression, fractionation and purification, refined 1,1-difluoroethane is obtained. it is fully mixed with chlorine gas in a quantitative ratio at 650-680 ℃ for pyrolysis to generate crude vinylidene fluoride, and then compressed, fractionated and purified to obtain. 2. Other methods Due to the development of the chlorofluorosane substitute industry in recent years, 1,1, 1-trichloroethane can be used to produce 1, 1-difluoro-1-chloroethane by one-step reaction, and then heat Cracking to release hydrogen chloride.
category
Compressed gas and liquefied gas
toxicity classification
low toxicity
acute toxicity
inhalation-rat LC 128000 PPM/4 hours
explosive hazard characteristics
Explosive mixing with air
flammability hazard characteristics
Flammable; decomposes toxic hydrogen fluoride gas when heated
storage and transportation features
The warehouse is ventilated and dry at low temperature; stored separately from the oxidant
fire extinguishing agent
Water