Modification of cotton fabric with acrylamide in the presence of K₂S₂O₈for improving dyeability of natural dyes

Abstract

Cotton fabrics were modified using acrylamide as the aminating agent in the presence of potassium peroxodisulphate (K 2 S 2 O 8 ) as a free radical polymerisation catalyst using a pad-dry-cure technique in order to improve the dyeability of cotton fabrics with natural dyes. Pre-soaking of bleached cotton fabric with 5 g l − 1 K 2 S 2 O 8 and subsequent application of 10 g l − 1 acrylamide monomer on the pre-soaked cotton fabric, followed by drying of the padded fabric at 95 ° C for 5 min and curing of the dried fabric at 140 ° C for 5 min, produced most balanced improvements in dye uptake, tensile strength and wrinkle recovery angle for optimum retention of flexibility of the dyed substrates when pre-treated cotton fabrics were dyed with Camellia sinensis and Punica granatum . Application of ferrous sulphate on pre-treated cotton fabric following a pre-salt application method and subsequently dyeing with Camellia sinensis and Punica granatum improved the depth of shade and all-round colour fastness properties further. Infrared (IR) spectroscopy indicated that the treatment with acrylamide under the influence of K 2 S 2 O 8 led to incorporation of poly(acrylamide) in cotton by the process of graft co-polymerisation using the pad-dry-cure technique.

Textile colouration with natural colourants: A review

“…In exhaust dyeing technique, the dyes are transfered from dyebath into the fibre polymer by adsorption and absorption and finally get fixed into polymer network. On the other hand, padding (mostly pad-dry-cure in natural dyeing) has some distinct advantages over exhaust method (Maulik et al, 2011;Syamili et al, 2012).…”

“…Cotton --acrylamide monomer was padden on cotton fabric presoaked with K2S2O8, dried at 95°C for 5 min and cured at 140°C for 5 min; -dyed for 60 min at 90°C, m:l 1:50, pH 4.2 ± 0.2; -washed with non-ionic detergent for 10 min at 60°C, then cold-washed and dried. (Maulik et al, 2011) Lac insect (Luccifer lacca) Cotton --cotton pretreated with chitosan was dyed for 180 min at 30°C, pH 3.0, m:l 1:100; (Rattanaphani et al, 2007) Green tea leaf (Camellia sinensis)…”

Modification of Hemp Fabric with Endoglucanase and Acrylamide for Efficient Enhancing Dyeability of Natural Dyes

“…(3) Application of acrylamide monomer on hemp The oxidation-reduction system of K 2 S 2 O 8 and K 2 SO 3 (mass ratio was 1.5 : 1) solution of 6.5 g L −1 concentration was as redox initiator with water as solvent, get the hemp fabric treated with cellulase and immerse them in the solution. The dipped-fabrics were then grafted by solution polymerization with acrylamide monomers solution of 20 g L −1 [3].…”

Dyeing of Cotton Fabric Modified by 2, 3-Epoxpropyl Triethyl Ammonium Chloride with Reactive Dyes

“…Then lots of high colored and high concentration salt wastewater is generated. So a series of methods are invented to improve the dye-uptake rate and fixation rate for cotton fabrics [1,2]. Such as, the succedaneum of salt, which can decrease the dosage of salt in the dyeing process [3]; linking the -NH 2 group on the dye molecules, the -NH 2 group can improve the molecule weight of dye and make the dye molecule have some positive charge, then the fixation rate can increased a lot [4,5]; Grafting cationic compound on the fabric, cationic groups can attract the dye molecular and make the fixation rate very high [6].…”