| 摘要 |
The present invention provides a coating composition for hydrophilization comprising (A) a water-soluble or water-dispersible organic resin, (B) organic resin fine particles described below and (C) a crosslinking agent, and a method for hydrophilization of heat exchanger fins by coating said fins with the above composition. The organic resin fine particles (B) are fine particles having a weight-average particle diameter/number-average particle diameter ratio of 1.2 or less and an average primary particle diameter of 0.1-1.0 mu m, which are obtained by dispersion-polymerizing 100 parts by weight of a monomer mixture consisting of 0.1-10.0% by weight of (a) at least one monomer selected from a polyoxyalkylene chain-containing (meth)acrylate and a (meth)acrylamide, 15.0-45.0% by weight of (b) divinylbenzene, 45.0-84.9% by weight of (c) styrene and 0-39.9% by weight of (d) (meth)acrylic acid, in the presence of 40 parts by weight of a poly(meth)acrylic acid in a lower alcohol. The composition can form a hydrophilic film superior in retention of hydrophilicity, continuous formability and corrosion resistance.
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