HYDROPHILIC COATING MATERIAL, ALUMINUM MATERIAL, ALUMINUM FIN MATERIAL AND HEAT EXCHANGER

To provide a hydrophilic coating material capable of forming a coating film which can maintain hydrophilicity to an aluminum material over a long period of time.SOLUTION: There is provided a hydrophilic coating material for an aluminum material which comprises specific inorganic metal compound parti...

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Hauptverfasser: KAKITANI KENTA, KOYAMA ERINA, IIZUKA SHINICHI, USUI NAOTO, MATSUMOTO YUYA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a hydrophilic coating material capable of forming a coating film which can maintain hydrophilicity to an aluminum material over a long period of time.SOLUTION: There is provided a hydrophilic coating material for an aluminum material which comprises specific inorganic metal compound particles or organic resin particles (A), an alkali metal silicate (B), a water-soluble resin or a salt thereof (C) and water, wherein the alkali metal silicate (B) is M2O-nSiO2 (n is in the range of 1.9 or more and 8.0 or less and M represents an alkali metal), the water-soluble resin is a monopolymer or copolymer having a structure of -[C-C(COOH)]- and an acid value of 700 mgKOH/g or more, the ratio (CM/TM) of the mass (CM) of the water-soluble resin or a salt thereof (C) to the total mass (TM) of the inorganic metal compound particles or organic resin particles (A) and the alkali metal silicate (B) is 0.2 or more and 2.5 or less and the ratio (AM/BM) of the mass (AM) of the inorganic metal compound particles or organic resin particles (A) to the mass (BM) in terms of SiO2 of the alkali metal silicate (B) is 0.10 or more and 4.0 or less.SELECTED DRAWING: None 【課題】アルミニウム材に対し、長期にわたって親水性を維持することが可能な塗膜を形成することができる親水性塗料等を提供する。【解決手段】本発明のアルミニウム材用親水性塗料は、特定の無機金属化合物粒子又は有機樹脂粒子(A)と、アルカリ金属珪酸塩(B)と、水溶性樹脂又はその塩(C)と、水とを含有し、前記アルカリ金属珪酸塩(B)は、M2O・nSiO2(nは1.9以上8.0以下の範囲内であり、Mはアルカリ金属を表す。)であり、前記水溶性樹脂は、-[C-C(COOH)]-の構造を有し、酸価が700mgKOH/g以上である単重合体又は共重合体であり、前記無機金属化合物粒子又は有機樹脂粒子(A)と前記アルカリ金属珪酸塩(B)との総質量(TM)に対する、前記水溶性樹脂又はその塩(C)の質量(CM)の比(CM/TM)が0.2以上2.5以下の範囲内であり、前記アルカリ金属珪酸塩(B)のSiO2換算質量(BM)に対する、前記無機金属化合物粒子又は有機樹脂粒子(A)の質量(AM)の比(AM/BM)が0.10以上4.0以下の範囲内である。【選択図】なし