Chitosan as a Thickener for Direct Printing of Natural Dye on Cotton Fabric

Abstract

Development of chitosan as a thickener for direct printing of natural dye on cotton fabric was investigated. Chitosan was applied as a thickener at various concentrations and its effect on the print properties was determined in comparison with the typical printing thickener, sodium alginate. The results exhibited that chitosan affected the fabric properties by increasing fabric yellowness and stiffness. However, with increasing chitosan concentrations, the yellowness reduced only marginally. Direct printing on cotton fabric with 3% Natural Chestnut at varying chitosan concentrations showed that the optimum chitosan concentration for the printing was at 3%w/v, being equivalent to the viscosity of 17,800 mPa. The 3%w/v chitosan imparted the ultimate color yield, print outline sharpness and a minimal dye bleeding on the unprinted area of the fabric. Use of chitosan concentration higher than 3%w/v led to poor print properties on the fabric. The efficiency as a thickener of chitosan was found to be superior to sodium alginate. A high color yield and good color fastness properties on cotton fabric were rendered in the case of chitosan thickener at the same applied concentration with sodium alginate.

Water-Soluble 2,5-Anhydro-d-mannofuranose Chain End Chitosan Oligomers of a Very Low Molecular Weight: Synthesis and Characterization

“…A wide range of chitosan exists with various molar masses from 100 000 g/mol up to 500 000 g/mol with acetylation degree between 0 and 30% . Many interesting applications result from the use of chitosan. − Nevertheless, chitosan use is limited due to its high viscosity, its insolubility in organic solutions, and poor solubility in aqueous solution owing to the pH . Hence, a flourishing interest for lowering the molar masses to obtain chitosan oligomers appeared over the last decade. − …”

Chitosan: A biopolymer for textile processes and products

“…[214][215][216][217] As CS possesses water-binding capacities and reactive properties due to the presence of -NH 2 and -OH groups, it was used as a thickener and binder in textile printing. 218,219 Abdou et al 220 used blends of CS/starch as a thickener in the screen printing of different textile samples (nylon 6, cotton and polyester). They showed that both the color strength and fastness properties of printed fabrics are enhanced.…”

“…214–217 As CS possesses water-binding capacities and reactive properties due to the presence of -NH 2 and -OH groups, it was used as a thickener and binder in textile printing. 218,219…”

Effects of metal ions on the self-assembly of chitosan molecules investigated with atomic force microscopy

“…Chitosan has received more attention for its wide range of applications in food science, biology, medicine, cosmetics, environmental protection, which contain potential application value. [4][5][6][7][8][9] Accordingly, new patterns are urgent to equip self-assembled structures of chitosan such as nanowires, hydrogels, membranes, and emulsions which could be applied to various fields. [10,11] As a hydrophilic biopolymer, chitosan is a compound with intramolecular hydrogen bond owing to the presence of plenty of free -NH 2 and -OH in each unit, which allows chitosan to have a strong chelating ability with metal ions.…”