Aluminium alloy material with coated film and heat exchanger radiating fin made by same material

Abstract

The aluminum or aluminum alloy material has an aluminum or aluminum alloy substrate, a hydrophilic film with a thickness of 0.1 to 10 mu m formed on the substrate, and a water soluble resin film with a thickness of 0.1 to 10 mu m formed on the hydrophilic film. The hydrophilic film contains, based on 100 pts.mass of at least one kind selected from the group consisting of polyacrylic acid and polyacrylates, 1 to 200 pts.mass of water soluble resin having hydroxyl groups in molecules, and 1 to 20 pts.mass of at least on kind selected from the group consisting of phosphoric acid and phosphate compounds. The water soluble resin film has hydroxyl groups in molecules. The invention provides for a heat exchanger fin which can maintain hydrophilic properties over a long period of time even in a peculiar indoor environment where the concentration of contaminants in the indoor air constantly remains high, and has excellent press formability as well, and to provide a fin for a heat exchanger.

Description

technical field [0001] The present invention relates to an aluminum or aluminum alloy material with a film and a heat exchanger fin using the material, in particular to an excellent hydrophilic continuity when pollutants are attached, and is suitable for room air conditioning (Room air conditioning) and packaged air conditioners (Package air conditioning) and other heat exchanger fins and their materials. Background technique [0002] In fins for heat exchangers such as room air conditioners and packaged air conditioners, materials excellent in thermal conductivity and workability have been particularly desired. Therefore, aluminum or aluminum alloys (hereinafter referred to as aluminum materials) are generally used. In order to improve heat dissipation performance, aluminum materials for heat sinks with improved corrosion resistance and hydrophilicity have been developed. [0003] However, recently, when air conditioners are used in apartment buildings, etc., there has bee...

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Problems solved by technology

[0005] However, when the aluminum material disclosed in JP-A-2001-201289 is applied to heat sinks such as air conditioners, the hydrophilicity can be maintained for a certain period of time in a common pollutant atmosphere, but in a specific room temperature environment (for example, in When continuously spraying pollutants that deteriorate hydrophilicity (environments where adhesives are used in industry, etc.) or in environments where the concentration of pollutants in the indoor air continues to increase, such as when the room is closed and pollutants remain indoors) , it can be considered that the hydrophilicity of the surface of the heat sink is easily reduced, resulting in insufficient hydrophilicity