Significance of Chitosan to Improve the Substantivity of Reactive Dyes

Abstract

Chitosan (polysaccharide) is used for cationization of cotton and to increase the uptake of reactive dye by the cationized cotton. Four different concentration of chitosan (0.5, 1.0, 1.5 and 2.0%) were applied for 0.5 and 4.0% shades of C.I. Reactive Red and C.I. Reactive Yellow dye, respectively. Different properties e.g. K/S value, washing fastness, light fastness and rubbing fastness of the dyed cotton (untreated and treated with chitosan) were recorded for comparison. The K/S values of chitosan treated fabrics (6.1-13.9 and 18.3-22.8 for both dye shades, respectively) were considerably better than untreated fabric (4.7-5.3 and 16.8-17.0). The results of present study clearly demonstrated that the use of chitosan as an exhausting agent not only reduced the amount of dye for dyeing the cotton fabric but also improved the washing and rubbing fastness properties. The present study further demonstrated that the use of chitosan in textile industry can minimize the dyeing cost, effluent treatment cost and other auxiliary utilization.

Chitosan: A biopolymer for textile processes and products

“…184 CS contains a high proportion of amino groups, which provide more dye sites for anionic (reactive, acid and direct) dyes to be absorbed by textile fibers and fabrics through van der Waals forces and electrostatic attraction. Therefore, CS treatment can improve the tinctorial properties of textiles, such as the affinity to anionic dyes, color strength and fastness, 185,186 in salt-free dyeing baths. 187 In the dyeing process of textile fibers or fabrics, reactive dyes are the most used due to their better wet fastness, brilliance, hue variability, easy processability and applicability.…”

Use of Chitosan as Antimicrobial, Antiviral and Antipollution Agent in Textile Finishing

“…Chitosan contains a high proportion of amino groups which provide more dye sites for anionic (reactive, acid and direct) dyes to be absorbed by textile fibers and fabrics through Van Der Waals forces and electrostatic attraction. Therefore, ChSN treatment can improve tinctorial properties of textiles such as affinity to anionic dyes, color strength and fastness [95][96] in salt free dyeing baths [97].…”

Efficient cationization of cotton fabric via oxidative pretreatment for salt-free reactive dyeing with low chemical consumption

“…18 To avoid these disadvantages, cationic polymers show good application prospects in salt-free reactive dyeing because of their higher affinity to cellulosic fibers, and the studied polymers include poly(diallyldimethylammonium chloride) (PDDACl), chitosan, poly(acrylamide-co-diallyldimethylammonium chloride) (PAcD), quaternized poly[bis(2-chloroethyl)ether-alt-1,3-bis [3-(dimethylamino)propyl]urea], poly(hexamethylene biguanide) (PHMB), poly(acryloxyethyl trimethylammonium chloride) (PAOTAC), tertiary amine cationic polyacrylamide (TACPAM), polyamino carboxylic acids (PACAs), cationic starch (Q-TAC), keratin, betaine, and ovalbumin. [19][20][21][22][23][24][25][26][27][28][29] For example, Oliveira et al 30 used chitosan and PDDACl to modify cotton and polyester blended fabrics, and high dyebath exhaustion and excellent color strength were obtained for dyeing of the modified fabrics with dispersed/reactive dyes. Correia et al 19 found that PDDACl presented results similar to the commercial reagent CHPTAC, but the concentration of cationic agent was 20 g L −1 and high pH was employed to increase the interaction of cotton fiber with the cationic agent.…”