Preparation of Novel Chitosan-Starch Blends as Thickening Agent and Their Application in Textile Printing

H. M. El-Hennawi,K. A. Ahmed,E. S. Abdou

doi:10.1155/2013/595810

Abstract

Chitosan, a naturally available biopolymer which is now increasingly used as a functional finish on textile substrates to impart antimicrobial characteristics and increase dye uptake of fabrics, was blended with different ratios of gelatinized starch. The chitosan was extracted and characterized by IR,1H-NMR, and X-ray powder diffraction. These blends were tested as thickeners in textile screen printing usingCurcuma tinctoriaas natural dye. The rheological properties and the viscosity of the printing paste were measured. The effect of chitosan on the printing properties of different fabrics (natural, blends, and synthetic fabrics) was studied by measuring the color strength value (K/S) and related color parameters of the printed fabrics. The antimicrobial properties of printed fabrics were assessed. The results proved that the printed fabrics using these new thickeners showed increase in the color strength value (K/S) giving darker color which means that chitosan increased the dye uptake on fabrics. Fastness properties of the printed fabrics to washing, rubbing, perspiration, and light have also been improved. The treated fabrics were found to be antimicrobial.

Highlights

Improving the environmental impact and unifying processes as a result of using one class of dyes in coloring fabrics made of blends of chemical and natural bers is one of the main trends in the evolution of textile dyeing and printing technology.Recently, there has been a revival of interest in natural dyes throughout the world as some synthetic dyes are being banned due to their toxic, carcinogenic, and polluting nature
Natural dyes are used for food coloring, painting, and textile dyeing [1, 2]. ey have shown a greater interest in textile dyeing because they are more ecofriendly than synthetic dyes
E degree of deacetylation (DDA%) of chitosan determined by potentiometric titration [11], and the molecular weight was calculated using the value of intrinsic viscosity [12], measured by an Ubbelohde viscometer. e value of (DDA%) and molecular weight of chitosan were 85% and 11.44 × 104 gm/mol, respectively

Summary

Introduction

Improving the environmental impact and unifying processes as a result of using one class of dyes in coloring fabrics made of blends of chemical and natural bers is one of the main trends in the evolution of textile dyeing and printing technology.Recently, there has been a revival of interest in natural dyes throughout the world as some synthetic dyes are being banned due to their toxic, carcinogenic, and polluting nature. Improving the environmental impact and unifying processes as a result of using one class of dyes in coloring fabrics made of blends of chemical and natural bers is one of the main trends in the evolution of textile dyeing and printing technology. Most natural dyes need the use of chemicals, called mordant, to help promoting dye absorption and xing and prevent bleeding and fading of the colors. Mordants form chemical bonds between the dye molecules and the proteins of the fabrics (wool is generally the best fabric colored with natural dyes). Natural dyes are used for food coloring, painting, and textile dyeing [1, 2]. Ey have shown a greater interest in textile dyeing because they are more ecofriendly than synthetic dyes. Curcumin (1,7-bis(4-hydroxy-3-methoxy phenyl)-1,6heptadione-3,5-dione) is a yellow pigment present in rhizome of Curcuma longa which is widely used in food industry [3]

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