Study On The Synthesis And Dyeing And Finishing Behaviours Of Ionic Sulphur Dyes

Alkali metal thiolate is usually a necessary in the dyeing process of sulfur dyes, which can bring about serious environment pollution. The study on sulfur dyes without using sodium thiolate and their eco-friendly application process is greatly concerned home and abroad.Till now many methods have been attempted in order to improve the dyeing performance of the sulphur dye. Herein, 1-chloroacetic acid and 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CHPTMA) were employed in the modification of traditional sulphur brown dye, which emphasized on the study of dyeing behavior of the synthesized novel cationic sulphur brown dye on silk, such as the color strength (K/S values) and fastness of dyeing. The purpose of the contrast work of dyeing properties between the modified dyes and conventional dyes were to determine whether the resultant polycarboxylic dyes show bifunctional properties of dyeing and finishing and whether dyeability and fastness of the dyed silk could be enhanced through the incorporation of polyquarterammine groups into the C.I Sulphur Black 1. This research work demonstrates that the effort of employing the modified cationic water-soluble sulphur black dye is a successful application expansion and technology innovation of traditional sulphur dyes with remarkable practical significance, in dyeing process without using sodium thiolate , excellent light fastness and good rub fastness, were obtained on the dyed protein fibers.In the thesis, the cationic behavior of traditional sulfur dyes was studied. The effects of different cationic reagent amount, reaction temperature, reaction time, pH value on the solubility of the obtained cationic dyes were emphasized. The dyeing properties of the synthesized dyes on some materials, such as silk, wool protein fabrics, cotton, linen natural cellulose fabrics, wool/acrylic fibers blend, and K/S value and dyeing fastness were examined.The satisfactory dyeing results indicate that the fixation of the silk dyed with cationic sulfur black is over 98%, light fastness of it gets to 6 grade, wet rub fastness reaches 4 grade and dry rub fastness reaches 4-5 grade on silk. For sulfur brown, on silk, wet and dry rub fastness can respectively reach 3-4 grade and 4-5 grade; and on wool, wet and dry rub fastness respectively reach 3 grade and 3-4 grade. The results indicate that the series dyes synthesized in this work can not only be applied widely but also have satisfactory fastness properties. It is believed that the non-cancinogenic cationic sulphur dyes have a promising prospective in their application.