油状汚こうの洗剤溶液中における挙動 : DLVO理論及びヘテロ凝集理論からのアプローチ

概要

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The behavior of oily soil in a detergent solution was discussed in terms of the ζ-potential and the potential energy of interaction. Oleic acid and oleyl alcohol were used as a model of oily soil. The nonphosphate detergent (composed zeolite, 20%) was considered. The ζ-potentials of oleic acid and oleyl alcohol in each aqueous solution of sodium dodecyl sulfate, various builders (sodium tripolyphosphate, sodium silicate, sodium carbonate, sodium carboxymethyl cellulose, sodium sulfate), and the detergent were measured by a microelectrophoresis. The potential energies of interactions between the oily soil and each materials (nylon, cellulose, zeolite, clay, carbon black, carbon black coated with palmitic acid) were calculated by the use of the theory of heterocoagulation and that between oily soils by the use of the DLVO theory. From these results, it is suggested that also when sodium tripolyphosphate is not composed, oily soils are dispersed in the detergent solution well by the effect of sodium dodecyl sulfate and various builders, and do not redeposit onto fabrics.