Abstract
Builder effects of hydroxy carboxylates, amino acids and N-acylamino acid were studied and compared with those of sodium tripolyphosphate (STP). Chelating capacities of the builders for individual and binery systems as a function of pH were examined using calcium ion selective electrode at 30°C. On the other hand, builder effects of the compounds on detergency with 0.05% anionic surfactant [sodium dodecylbenzensulfonate (DBS) or α-olefinsulfonate (AOS)] were tested for cotton and polyester fabrics soiled with dust, in 100 ppm hard water at pH 9.5, 30°C. It was demonstrated that chelating capacity (mg CaCO3 / g) and detergency of STP were superior than the others, but hydroxy carboxylates were more effective on detergency performance at fairly high concentration than STP at ordinary level, and also more effective consisting with DBS than AOS. Moreover, it was found that AOS was an excellent surfactant for low phosphate detergent formulations because of its high performance in hard water.
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