Abstract
The effects upon surface tension for the aqueous solution of sodium dodecyl sulfate (SDS) by concentration of calcium and triphosphate ions were investigated. The results were interpreted by change of surface adsorption for dodecyl sulfate salt under concentration of sodium tripolyphosphate (STP). Interfacial tension between the solution mentioned above and two sorts of oil, i. e. oleic acid and liquid paraffin, and the contact angle of the two liquid interface on polyester films were measured. Residual works of detergency for these systems were calculated from these values and the effects of STP concentration upon the STP-hard water systems were discussed. It was concluded that the detergent builder effects of STP were dependent on types of oil. For oleic acid soil, soap formation in situ as an alkaline salt emulsified the oil itself. On the other hand, for paraffin droplet soil, they assisted to increase the contact angle on the film and to remove easily from the film by rolling-up mechanism.
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