Diffusion of acid dyes in nylon film in the presence of inorganic salts

The concentration-dependence measured by steady-state permeation and unsteady-state dyeing methods for a system of acid dye C.I.Acid Blue 182–nylon 6 film in the presence of inorganic salts such as NaCl, Na₂SO₄, and K₂SO₄, was analyzed in terms of parallel diffusion with simultaneous multimodal adsorption. It would found that the dyeing process with added NaCl was governed by surface diffusion with two kinds of Langmuir adsorption, whereas with added Na₂SO₄ and K₂SO₄ it was governed by surface diffusion with three kinds of Langmuir adsorption.