The Study Of Reactive Disperse Dyes In Supercritical CO₂ On The Wool Dyeing

This paper adopts reactive disperse yellow GR and reactive disperse yellow GR to dye wool loose fiber?wool skein in supercritical carbon dioxide dyeing equipment. The influencing factors are analyzed by measuring K/S of dyed wool skeins, including time, temperature and pressure.In the process of dyeing, with the increase of dyeing time, temperature, pressure and the amount of dyes, dye molecules gradually to the internal diffusion, when reaching the dyeing time, temperature, pressure and the amount of dye, dye adsorption reached saturation, K/S value change slowly.The optimal dyeing parameters are as following. The optimum reactive disperse yellow GR dyeing process for dyeing best:wool loose fiber: dyeing time 40min, dyeing temperature 100?, dyeing pressure 22 MPa,the amount of dye 3%; wool skein:dyeing time 40min, dyeing temperature 100?, dyeing pressure 22 MPa,the amount of dye 3%. The optimum reactive disperse blue R dyeing process for dyeing best:wool loose fiber:dyeing time 40min, dyeing temperature 100?, dyeing pressure 24 MPa,the amount of dye 4%; wool skein:dyeing time 60min, dyeing temperature 100?, dyeing pressure 20 MPa,the amount of dye 3%. Then we adopt the scanning electron microscope (SEM) and the infrared spectrum (FTIR) to observe the apparent shape and structure before dyeing and after dyeing. The results indicate that through scanning electron microscopy detection before and after dyeing with reactive disperse dyes apparent morphology, after dyeing with reactive disperse dyes globular structure division, the apparent change in the structure of. Using of infrared spectroscopy analysis of the spectral curves of the dyed wool in dyeing wool, with covalent bond formation, improve the fastness of the dyed wool.The national standard GB/T 3921-2008 and GB/T 3920-2008.This paper adopts mixed reactive disperse dyes(reactive disperse yellow GR and reactive disperse blue R) to dye wool loose fiber and wool skein in supercritical CO2 dyeing equipment.Analysis the influence of dyeing temperature, dyeing time, dyeing pressure on the wool loose fiber and wool skein. By the dyeing results reveal the interaction relationship between single dyes dyeing on the wool yarn. The results show that, the total uptake of mixed reactive disperse dyes and the uptake of single reactive disperse dyes increase with the increasing of temperature and pressure, it also increase by the extension of time. In the same conditions, the total uptake of mixed reactive disperse dyes is more than the uptake of single reactive disperse dyes. The uptake of single reactive disperse dyes in the mixed dyes is less than the uptake of single reactive disperse dyes. In the dyeing process of mixed dyes, the wool fiber dyeing of two dyes has selective and competitive. Both color fastness to rubbing and color fastness to washing of dyed wool fibers are in line with national institute of standards. The national standard GB/T 3921-2008,GB/T 3920-2008.Supercritical carbon dioxide dyeing with reactive disperse dyes, while the use of disperse dyes blue GL dyes and reactive disperse blue R dyes in supercritical carbon dioxide dyeing wool fibers, the dyed wool testing and analysis. The results indicated, reactive disperse dye is combined with the wool fiber, the dye can be fixed on the fiber, it has excellent performance. the dyed wool skeins and wool loose fibers have good fastness.