Dyeing procedure for the modified cotton (aminoethyl cotton)
The dyeing was carried without the addition of salt. The modified cotton fabric was introduced in aqueous bath containing 4% dye (omf, weight percent of dye relative to fiber) at a liquor ratio of 1:30. The temperature was kept at 25 °C. After 30 min, the dyeing temperature was gradually increased to 60 °C in 20 min. Then 20 g/L sodium carbonate was added with stirring and the dyeing process was continued for 60 min. At the end of dyeing process, the dyed fabric was soaped in a solution of a nonionic surfactant (Triton X-100, 1 g/L) at 90 °C for 20 min at liquor ratio 1:30 and then thoroughly rinsed in tap water.