Synthesis of reactive disperse dyes containing halogenated acetamide group for dyeing cotton fabric in supercritical carbon dioxide

• The synthesis of reactive disperse dyes containing halogenated acetamide group had been described.
• These reactive disperse dyes were applied to dye cotton fabric in supercritical carbon dioxide (scCO2) with good results.
• The color fastness (washing and rubbing), color strength ((K/S)dyed and (K/S)extracted), and fixation efficiency of dyed cotton fabric were investigated. The color characteristics were studied as well in terms of the reflectance spectra.
• The results indicated that the different substituent or parent body for dyes led to different dyeing depth and color.

A series of reactive disperse dyes incorporating halogenated acetamide group were synthesized and applied to dye cotton fabric in supercritical carbon dioxide (scCO2). Dyeing experiments were conducted in scCO2 with dye concentration of 0.5% owf (% on weight of cotton fabric), varying from 80 to 120 °C, for 1–3 h at a constant pressure of 200 bar. The results showed that the color strength of dyed cotton fabric increased favorably when increasing temperature and time. The color characteristics were studied as well in terms of the reflectance spectra. And the color fastness to washing and rubbing were also reasonably good.

Figure optionsDownload as PowerPoint slide