Method for preparing fluorine-containing nitrile rubber through low-temperature emulsion polymerization

The invention provides a method for preparing fluorine-containing nitrile rubber by adopting a low-temperature emulsion polymerization method and a product obtained by using the method. The fluorine-containing nitrile rubber is prepared by adopting a fluorine-containing monomer emulsion polymerization method. In the polymerization process, a chelating titanate coupling agent is adopted, so that the ternary copolymerization efficiency of a fluorine-containing monomer and acrylonitrile and butadiene can be remarkably improved. A molecular weight regulator needs to be added for multiple times, and preferably, at the first time, 0.2-1 part of the molecular weight regulator is added; and when the conversion rate reaches 40%-65%, 0.05-0.2 part of the molecular weight regulator is supplemented. The comprehensive performance of the fluorine-containing nitrile rubber prepared according to the method is improved, the prepared fluorine-containing nitrile rubber is high in oil resistance and highin tensile strength, comp