Precoated fin material for heat exchangers and heat exchanger

A heat exchanger, comprising a fin structure in which a large number of flat precoated fin materials are placed at a predetermined interval to be parallel to each other, and a hydrophobic surface having a frost formation-suppressing effect and a hydrophilic surface having a condensed water-removing effect are opposite to each other between precoated fin materials adjacent to each other,

• wherein:
• the large number of precoated fin materials include of a large number of one-side hydrophobic/one-side hydrophilic fin materials each having, on one surface of a fin substrate formed of an aluminum plate material formed of aluminum or an aluminum alloy, a crosslinked hydrophobic film forming the hydrophobic surface and each having, on another surface thereof, a hydrophilic film forming the hydrophilic surface, or include a plurality of double-side hydrophobic fin materials each having, on each of both surfaces of a fin substrate formed of an aluminum plate material formed of aluminum or an aluminum alloy, a crosslinked hydrophobic film forming the hydrophobic surface and a plurality of double-side hydrophilic fin materials each having, on each of both surfaces of a fin substrate formed of an aluminum plate material formed of aluminum or an aluminum alloy, a hydrophilic film forming the hydrophilic surface;
• and
• the crosslinked hydrophobic film is formed of an aqueous hydrophobic coating composition containing a resin (A) having at least one kind of fluorine atom-containing group selected from the group consisting of a perfluoroalkyl group and a perfluoroalkenyl group, a quaternary ammonium salt group-containing modified epoxy resin (B), and an amino resin (C) in which a solid content of the resin (A) having at least one kind of fluorine atom-containing group selected from the group consisting of a perfluoroalkyl group and a perfluoroalkenyl group is 1 to 30 parts by mass with respect to 100 parts by mass of a total of solid contents of the quaternary ammonium salt group-containing modified epoxy resin (B) and the amino resin (C).