Surface Coloration of Silk Dyed by Aniline Based on Different Process

Abstract

In order to improve surface coloration of dyed silk fabric, especially for high color fastness and low damage to silk protein, several new techniques have been developed recently. Aniline was treated as the dye mimetic, and two chemical modification dyeing techniques including the coupling reaction and three-component mannich-type reaction dyeing process of silk fabric were developed in this study. Meanwhile, the surface coloration indexes such as reflectance, K/S value, color fastness and other properties of dyed silk based on the above two dyeing techniques have been studied and compared with the traditional adsorption dyeing process of aniline under weak acid condition. The results showed that good surface coloration of silk including the K/S value and color fastness can be gotten in the two chemical modification dyeing techniques which developed in this experiment compared to traditional adsorption dyeing technique. The improvement of surface coloration and color fastness was confirmed to be caused by covalent bond which will be formed in these chemical modification dyeing between aniline or its diazonium salt and characteristic active groups of silk protein.