The sealing requirements in low-temperature environments mainly include the following aspects:
1. Retention of elastic components at low temperatures: Perfluoroether O-rings need to have good elastic retention components to ensure good sealing performance at low temperatures. In low temperature environments, due to the hardening or deformation of the material, the decrease in elasticity reduces the energy of the piercing component. Therefore, perfluoroether O-rings need to have high elastic retention performance to adapt to deformation and twisting in low temperature environments.
2. Chemisability at low temperatures: In low temperature environments, the corrosion resistance of certain chemicals is enhanced, which puts higher demands on the materials of seals. Fluorine rubber, the main component of perfluoroether O-rings, has excellent biodegradability and can work for a long time in various strong and high-performance media. Therefore, it has the potential to have good chemical resistance at low temperatures.
3. Sealing performance at low temperatures: In low-temperature environments, due to the high viscosity of gases or liquids and the possibility of expansion or contraction, perfluoroether O-rings need to have better compression and deformation capabilities to ensure good sealing performance. Therefore, perfluoroether O-rings need to have characteristics that are suitable for low-temperature deformation.
After experimental verification, it has been found that under certain conditions, perfluoroether O-rings can adapt to low-temperature environments. Therefore, their use in low-temperature environments is feasible.
1. Research has shown that perfluoroether O-rings have good chemical and heat resistance in the range of -50 ° C to 232 ° C.
2. A study on the performance of perfluoroether O-rings at low temperatures found that the hardness and tensile strength of the material decreased, but it still maintained good plasticity and toughness, with good low-temperature elastic properties. By optimizing its structure and composition, its low-temperature sealing performance can be improved. Researchers have improved the low-temperature sealing performance of perfluoroether O-rings by adding specific fillers and altering their cross-linking structure.
3. Under low temperature conditions, perfluoroether O-rings maintain material elasticity.
4. In practical applications, perfluoroether O-rings have been used for sealing requirements in low-temperature environments, such as the application of seals in low-temperature oil and gas pipelines, low-temperature reactors, and cryogenic equipment. These applications further validate the feasibility of perfluoroether O-rings in low-temperature environments.