Abstract
An experiment has been carried out to determine the effect of dye-dispersing power of surface active agents on the dyeability of two refined disperse dyes, C. I. Disperse Red 1 and C. I. Disperse Red 15, on polyester fibers at 80 and 95°C.In general, the additional dispersing agent decreased the dyeing rate in each case. Using at the same concentration, higher dispersing power of the agents lowers the exhaustion of dyes. Sodium naphthalene sulfonate formalin condensate has an excellent dye-dispersing power, but shows a marked tendency to inhibit the absorption of dyes. At low concentration, however, being equal or superior than other dispersing agents on the exhaustion of dyes, it is most suitable for dyeing of polyester fibers because of its high dispersing power.
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