Hydrophilic oil repellent and production method of same, surface coating material, coating film, resin composition, oil-water separation filter material, and porous body

A hydrophilic oil repellent, comprising:

• one or more nitrogen-containing fluorine-based compounds represented by the following formulas (1) to (4):
• wherein in the above formulas (1) and (2), Rf1 and Rf2 each represent a linear or branched perfluoroalkyl group having 1 to 6 carbon atoms, which are the same as or different from each other, and Rf3 represents a linear or branched perfluoroalkylene group having 1 to 6 carbon atoms;
• in the above formulas (3) and (4), Rf4, Rf5, and Rf6 each represent a linear or branched perfluoroalkylene group having 1 to 6 carbon atoms, which are the same as or different from each other, and Z includes any one of an oxygen atom, a nitrogen atom, a CF2 group, and a CF group;
• in the above formulas (2) and (4), R represents a linking group which is a divalent organic group;
• and
• in the above formulas (1) to (4), X is:
• an anion type hydrophilic imparting group having “—CO2M1” “—SO3M1” “—OSO3M1”, “—OP(OH)O2M1”, “—OPO3M12”, “═O2PO2M1”, or “—PO(OH)y(OM1)2-y,” wherein M1 represents an alkali metal, an alkali earth metal, Mg, Al, or R1R2R3R4N+, and wherein R1 to R4 are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 20 carbon atoms, and y represents an integer of 0 to 2, at a terminal, or
• a cation type hydrophilicity imparting group having “—N+R5R6R7.Cl−”, “—N+R5R6R7.Br−”, “—N+R5R6R7.I−”, “−N+R5R6R7.CH3SO3−”, “—N+R5R6R7.R7SO4−”, “−N+R5R6R7.NO3−”, “(−N+R5R6R7)2CO32−”, or “(−N+R5R6R7)2SO42−”, wherein R5 to R7 are hydrogen atoms or each independently a linear or branched alkyl group having 1 to 20 carbon atoms, at a terminal,
• or
• an amphoteric hydrophilicity imparting group having any one terminal of a carboxybetaine type, a sulfobetaine type, an amine oxide type, and a phosphobetaine type.