| abstract |
A heat exchanger having high deodorization against tobacco is provided. A heat exchanger having a hydrophilic film on the surface of an aluminum substrate, wherein the hydrophilic film contains 38 to 40% by mass of polyvinyl alcohol (A) having an ethylene chain and 22 to 24% of a radical polymerizable monomer (B1) having carboxylic acid 90% by mass or more of resin (D) containing 15 to 17% by mass of the radical polymerizable monomer (B2) represented by mass% and the following general formula (1) and 22 to 24% by mass of polyethylene glycol (C) And at the same time, it is formed using a hydrophilic treatment agent containing 0.8 to 1.8% by mass of a vanadium compound (E) in terms of vanadium element. |