DYEING OF NYLON WITH ACID DYES

The diffusion rates of several acid dyes were determined using the unstretched nylon gut.The method consists of measuring the dye penetration from the observation of ring-dyed gut section by means of microscope.The pentration distance is proportional to the square root of dyeing time, and in general increases as the dye concentration increases and the pH of dyebath decreases.From the temperature dependence of diffusion rate the apparent activation energy of diffusion is calcurated.The diffusion rate varies from dye to dye but its temperature dependence remains almost the same.