Perfluoropolyether phosphate compound as well as preparation method and application thereof

The invention discloses a perfluoropolyether phosphate compound. The perfluoropolyether phosphate compound has a structural general formula (I). In the formula (I), R1 is a straight chain or branched chain ether group of C2-C10; r2 is a straight chain or branched chain alkyl group of C1 to C10; rf is a group shown in a formula (II), and a ranges from 1 to 3; and m and n are each independently an integer from 1 to 50. According to the perfluoropolyether phosphate compound provided by the invention, the tail end of a perfluoropolyether chain is modified into a phosphate group to serve as a metal surface treatment agent, the perfluoropolyether chain can provide the characteristics of hydrophobicity, oleophobicity, antifouling property and high wear resistance for the surface of a base material, and the phosphate group can form a P-O-base material bond structure with hydroxyl on the surface of the base material; therefore, the fluoropolyether phosphate compound provides excellent hydrophobic and oleophobic proper