洗浄の研究 (第12報) : 油性汚こうの洗浄性に及ぼす接触角, 粘度, 界面張力の影響

概要

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The relations between oily soil removal efficiency and kinds of fabric and oily soil were studied from the side of viscosity, contact angle of oily soil and interfacial tension of oily soil/washing solution interface. The degrees of the change of contact angle of oily soil with the kinds of polymer film and oily soil decreased in the order : Triolein>olive oil>oleic acid>squalene>liquid paraffin>tetradecane for oily soils; and polypropylene>cellulose>nylon_??_treated polyethylene>polyester, for polymers, respectively. The contact angles of the mixed soil of liquidparaffin and n-octadecane for treated polyethylene, polypropylene, and nylon films increased with the increase of liquid paraffin/n-octadecane ratio. For the mixed soil of liquid paraffin and oleic acid, the contact angles for treated polyethylene and polyester decreased to a constant value with the increase of oleic acid, for cellulose increased gradually, and for polypropylene it increased through a minimum. The detergency of the mixed soil of liquid paraffin and n-octadecane depends on the viscosity and the interfacial tension of the mixed soil, but that of the mixed soil of liquid paraffin and oleic acid cannot be explained only by the viscosity and the interfacial tension of the mixed soil.