非イオン界面活性剤/水/脂肪酸汚れ系での液晶形成と洗浄への寄与

概要

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In the present work, the formation of ternary liquid crystals and the removal of fatty soil were studied for nonionic surfactant systems (surfactant/water/fatty acid soil) in the same manner as in previous studies. Observation with a polarizing microscope indicated that, for all nonionic surfactant systems, the liquid crystal phase is formed by transition from a concentrated solution phase. Thus, in the case of a nonionic surfactant system, the temperature for liquid crystal formation Tn may be considered a phase transition temperature such as the so-called Phase Inversion Temperature (PIT). The rate constants of fatty soil removal for nonionic surfactant systems were calculated under various mechanical conditions from the rate equatoion of fatty soil removal, presented in the previous paper. The dependence of the rate constants on temperature indicated the formation of liquid crystals to be essential to fatty soil removal as also noted for the anionic surfactant system. The detergency Fm for each mechanical force M was determined using the equation indicated the previous paper from the activation energy for removal (Ea). The dependence of Fm on M indicated the contribution of mechanical force to detergency to be less in the nonionic surfactant than anionic surfactant system.
社団法人日本油化学会の論文