Halogen-containing synthetic base oils, and preparation method and use thereof

A halogen-containing synthetic base oil, characterized in that the base oil contains FF-PAO and/or F-PAO, which are prepared from PAO as follows:

• wherein:
• PAO is
• molecular weight of FF-PAO or F-PAO is 100-20000;
• X is fluorine;
• n is an integer of 2-30;
• R is selected from the group consisting of:
• 1)A moiety of multi-branched polyethylene polymerized from ethylene, having a molecular weight of 100-20000,
• 2) a moiety of copolymer of ethylene and α-olefin with a chain length of 4-20 and a molecular weight of 100-20000, and
• 3) a moiety of polymer of isobutylene, having a molecular weight of 100-20000;
• wherein, FF-PAO or F-PAO is prepared by a step selected from the group consisting of:
• adding fluorine at terminal double bonds or other double bonds of the poly-alpha-olefins,
• adding fluorine at terminal double bonds or other double bonds of the polymer of monomeric alpha-olefins or mixed alpha-olefins,
• adding fluorine at terminal double bonds or other double bonds of the multi-branched polyethylene polymerized from ethylene,
• adding fluorine at terminal double bonds or other double bonds of the copolymer of ethylene and α-olefin, and
• adding fluorine at terminal double bonds or other double bonds of the polymer of isobutylene.