ORGANIC HYDROPHILIC COATING COMPOSITION AND HYDROPHILIC COATING FILM, AND ALUMINUM MATERIAL FOR HEAT EXCHANGER

PROBLEM TO BE SOLVED: To provide an organic hydrophilic coating composition for forming a hydrophilic coating film having not only performance such as long-term hydrophilicity but also self-cleaning performance on a surface of various hard materials such as a metal material, a plastic material and a ceramic material, and to provide a hydrophilic coating film, and an aluminum material for a heat exchanger such as a precoated fin material.SOLUTION: The organic hydrophilic coating composition is provided that contains 40-100 g/L of a polyvinyl alcohol-based resin as a resin component and 0.02-39 g/L of an ascorbic acid as an additive component and has a hydroxyl value of 550-1,300 mgKOH/g. The hydrophilic coating film and the aluminum material for a heat exchanger are provided that are formed using the organic hydrophilic coating composition.SELECTED DRAWING: None 【解決課題】金属材料、プラスチック材料、セラミックス材料等の種々の硬質材料の表面に、長期親水性等の性能に加えて自浄性能を有する親水性皮膜を形成するための有機親水性塗料組成物、及び親水性皮膜、並びにプレコートフィン材等の熱交換器用アルミニウム材を提供する。【解決手段】樹脂成分としてポリビニルアルコール系樹脂を４０〜１００g/Lの割合で含むと共に、添加成分としてアスコルビン酸を０．０２〜３９g/Lの割合で含有し、かつ、水酸基価が５５０〜１３００mgKOH/gである有機親水性塗料組成物であり、また、この有機親水性塗料組成物を用いて形成される親水性皮膜及び熱交換器用アルミニウム材である。【選択図】なし