Research progress of supercritical carbon dioxide dyeing technology

The dyeing mechanism of supercritical fluid and different dyeing process conditions are reviewed.Research progress of dyestuffs and color combination of blended dyestuffs is presented.The study on thermodynamics and kinetics of supercritical carbon dioxide dyeing is discussed.Dyestuffs solubility in supercritical carbon dioxide,dyestuffs distribution between fiber and supercritical CO2,and dyestuffs diffusion behavior in fiber are analyzed.The progress of dyeing equipment worldwide is reported.The key problems to be resolved in commercialization of supercritical carbon dioxide dyeing technology are as follows.One is enhancing dyes’ dissolution in supercritical carbon dioxide and diffusion in fiber,the other is development of large volume dyeing kettle under high pressure operating conditions.