Dyeing of nylon 66 with a disperse-reactive dye using supercritical carbondioxide as the transport medium

Nylon 66 fabric was dyed with a disperse-reactive yellow dyestuff which was synthesised in our laboratory, using a supercritical carbon dioxide dyeing process. The structure of the disperse-reactive yellow dyestuff and its co valent bond with nylon 66 fibres were confirmed by FTIR, NMR, EA and MS ana lysis. The nylon fabric was also dyed with CI Disperse Yellow 3 and the dye ing results compared. Colour yield values were measured for both dyed fabri cs, with those of the disperse-reactive dye showing much better values than CI Disperse Yellow 3. Wash fastness of the fabric dyed with the disperse-r eactive yellow dye was tested by the ISO 2 method and showed excellent resu lts. Light fastness was tested by the ISO 105 B05 method and the results we re satisfactory. The results obtained indicate fabric immersed in supercrit ical carbon dioxide does not undergo any fibre damage.