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|1. (WO2018185865) HYDROPHILICITY-IMPARTING AGENT, HYDROPHILIC COATING FILM FORMING METHOD, HYDROPHILIC COATING FILM, AND SOLAR PANEL|
KEIHIN CHEMICAL CO. LTD.
|Title:||HYDROPHILICITY-IMPARTING AGENT, HYDROPHILIC COATING FILM FORMING METHOD, HYDROPHILIC COATING FILM, AND SOLAR PANEL|
[Problem] A purpose of the present invention is to provide: a novel hydrophilicity-imparting agent that can impart high hydrophilicity to an object to be treated and that enables improved transparency in the infrared region for transparent materials such as a protective cover for a solar panel; and a hydrophilic coating film forming method. Another purpose of the present invention is to provide: a hydrophilic coating film formed by said hydrophilic coating film forming method; and a solar panel in which said hydrophilic coating film is formed on a surface of a protective cover. [Solution] Hydrophilicity is imparted to an object to be treated by a hydrophilicity-imparting agent that contains a solvent and silicic acid-type microparticles comprising a silicate or silica, wherein the silicic acid-type microparticles include at least a minor diameter group having a mode of not more than 10 nm and a major diameter group having a mode of 15 to 30 nm, the solids weight ratio in the solvent between the minor diameter group and the major diameter group is 3:1 to 1:5, and the content of the silicic acid-type microparticles in the hydrophilicity-imparting agent is 0.3 wt% to 3.0 wt%.