The sorption and diffusion of mono-, di- and trisulfonic acid dye in Nylon 6 from their infinite dyebaths at 50°C and pH2.2 adjusted with hydrochloric acid have been discussed in the light of the dual sorption and diffusion model. The dyes are Orange II (C. I. Acid Orange 7, Dye I), Sunset Yellow (C. I. Food Yellow 3, Dye II) and a trisulfonic acid dye (Dye III) prepared from sulfanilic acid and R acid. Partition coefficient,
Kp decreased, while Langmuir type sorption constant,
KL increased, with the introduction of sulfonic acid group into these dyes. The diffusivity of the adsorbed species (
L) is found to be of primary importance in determining the concentration dependence of the apparent diffusion coefficient.
抄録全体を表示