Dyeing of Nylon 6 with Disperse Dyes in Mixed Solvents of Tetrachioroethylene and N, N-Dimethylacetamide

Abstract

The dyeing behavior of Nylon 6 with C. I. Disperse Orange 3 and Violet 1 in mixed solvents of tetrachloroethylene and N, N-dimethylacetamide (DMA) has been investigated from the view points of diffusion and equilibrium. The diffusion coefficients of the dyes were determined by means of micro-spectrophotometric method and the partition coefficients were calculated from the linear adsorption isotherms. The solubilities were also examined. All the measurements were made on the samples in mixed solvents ranging in DMA concentration from 0 to 10 vol These dyes resemble each other in the effect of the DMA concentration on dyeing behavior. With the increasing DMA concentration, the diffusion coefficient at the temperature range of 60----80T increases markedly and both the activation energy and frequency factor of diffusion decrease. The effect of the DMA concentration on the partition coefficient is opposite to that on the diffusion coefficient. A rough correlation of a negative slope is shown between the partition coefficient and the solubility. The saturation value also increases with the increasing DMA concentration. An interaction, e. g. swelling, between the substrate Nylon 6 and each medium appears to play an important role in these phenomena.