Resin-coated metal plate and fin material for heat exchanger composed of the same

Abstract

The invention provides a metal plate coated by resin, and the metal plate can maintain excellent hydrophilicity for a long time. The metal plate coated by resin is characterized in that a resin coating coats the surface of the metal plate to form the metal plate coated by resin, the resin coating is obtained by a composition for forming the resin coating, and the composition comprises (A) a grafted polymer obtained by graft polymerization of vinyl pyrrolidone onto polyvinyl alcohol, (B) an anionic polymer employing at least one of sulfonic acid (sulphonate) and carboxylic acid (carboxylate) as the polymerization component, and (C) a cross-linking agent of at least one of the above grafted polymer and the anionic polymer.

Description

technical field [0001] The present invention relates to a resin-coated metal plate in which a resin coating layer having excellent hydrophilicity is formed on the surface of the metal plate. Moreover, this invention relates to the fin material for heat exchangers which can maintain the surface property which wets easily, such as dew condensation water, for a long period of time. Background technique [0002] In heat exchangers of air conditioners, aluminum materials are widely used due to their excellent thermal conductivity, processability, and corrosion resistance. A structure in which aluminum fins are arranged side by side at intervals. Therefore, when the temperature of the surface of the fin material falls below the dew point of the air during the operation of the air conditioner, the dew condensation water adhering to the surface of the fin material may condense and close the adjacent fins. At this time, when the hydrophilicity of the surface of the aluminum fin mat...

AI Technical Summary

Problems solved by technology

[0008] The metal plate described in the above-mentioned Patent Document 5 can suppress the elution of the film even when the immersion and drying (hereinafter also referred to as repeated immersion) are repeated multiple times, and the contact angle of the metal plate with water is almost no. (hereinafter referred to as the water contact angle), the inventors of the present application conducted additional tests on the value of the water contact angle, and as a result, it was found that it greatly exceeded 40° from the initial stage and remained high, so it cannot be done anyway. There is still a lot of room for improvement to meet the hydrophilic properties required as a fin material for heat exchangers

Images