| 摘要 |
PURPOSE: To provide a member with excellent water repellency and anti-frosting properties suitable for being used as a fin for a heat exchanger for a room air-conditioner serving both as cooling and heating and a method for preparing it. CONSTITUTION: A metal sheet material 1, a roughened surface-like film 2 consisting of an org. coating material incorporated with fine particles 3 formed on the surface of this metal sheet material and a water-repellent film 4 formed on this roughened surface like film are provided. The org. coating material and the water-repellent film are respectively a silicone coating material, a fluoro-coating material or a mixture thereof. It is pref. that the content of the incorporated fine particles incorporated in the org. coating material is 5-50wt.%, and more pref., 10-30wt.%. On the surface of the member treated like this, the contact angle of a water drop exceeds 150 deg. and the water drop easily falls down and, if water content in atmosphere condenses, no freezing occurrs on the surface of a fin. |
