Abstract
In order to investigate the phenomena of soil redeposition to fabric in the process of detergency, the soiling bath composed of 0.2% SDS solution containing dirt material (carbon black) and various builders, Na2SO4, Na5P3O10, Na2CO3, sodium carboxy-methyl cellulose (CMC), was prepared and each fabric such as cotton, nylon, acryl, polyester was soiled in this soiling bath.
First, the effect of each builder above mentioned on the soiling to these fabrics was examind. It was generally shown that the addition of Na2SO4, Na3P3O10, Na2CO3 in the soiling bath promoted the soiling and the addition of CMC prevented the fabrics from soiling.
Next, the ξ-potentials of fabric (by streaming potential method) and of carbon black (by electrophoresis method) in 0.2% SDS solution were measured to discuss the soiling properties.
The results showed that there was decreasing tendency in -ξ of fabrics and carbon black when Na2SO4, Na5P3O10, Na2CO3 were added in 0.2% SDS solution except in the case of nylon fabric-Na2SO4 system. While the addition of CMC showed the increase in -ξ of fabrics and carbon black. As far as our experiments are concerned, it was made clear that the change of soiling property of fabrics with the addition of builders is due to the change of ξ-potential of fabrics and carbon black. Thus, it is confirmed that the ξ-potential was one of the inportant factors in the soil redeposition to fabrics in the process of detergency.
