Fluorine rubber is refers to the main chain or side chain of carbon atoms containing fluorine atoms on a synthetic polymer elastomer, it not only has good mechanical properties, and a high degree of high temperature resistant, oil resistant and characteristic of a variety of chemical erosion resistance, excellent comprehensive performance special, so its application scope is widespread, especially a large number of is used in the production of the special sealing products, is a modern aircraft, missile, rocket, Materials indispensable for advanced science and technology such as space navigation and other industries (such as automobiles).
Because polyolefin fluororubber (26 type fluororubber, 23 type fluororubber) and nitroso fluororubber, there is no unsaturated C = C bond structure on the main chain. This reduces the possibility of degradation and chain breaking on the main chain due to oxidation and pyrolysis. The methylene group of vinylidene fluoride plays a very important role in the softness of the polymer chain. For example, fluororubber 23-21 and fluororubber 23-11 are composed of vinylidene fluoride and trifluorovinyl chloride in a ratio of 7∶3 and 5∶5 respectively. The former is obviously softer than the latter.


Either vinylidene fluoride and chlorotrifluoroethylene, or the copolymers of vinylidene fluoride and hexafluoropropylene and their trimers of tetrafluoroethylene, may be predominantly crystalline or amorphous. This depends on how much the other monomer is involved when one monomer is the main segment of the copolymer. Electron diffraction studies show that when the mole fraction of vinylidene fluoride reaches 7% in the vinylidene fluoride chain segment, or 16% in the vinylidene fluoride chain segment, the two copolymers still have the same homopolymer crystal structure. However, when the molar fraction of hexafluoropropylene is increased to more than 15%, or the molar fraction of vinylidene fluoride is increased to more than 25%, the lattice is greatly destroyed, resulting in the amorphous structure of rubber properties. This is because the addition of the second monomer destroys the regularity of the original molecular chain. Fluorine rubber can be used with nitrile rubber, acrylic rubber, ethylene propylene rubber, silicone rubber, fluorine silicone rubber, etc., to reduce the cost, improve the physical and mechanical properties and process performance.