Effect of natural antioxidants on colour strength and colour coordinates of reactive dyed cotton fabric

BHINI   JAIN; K. J.  SANNAPAPAMMA

BHINI JAIN Department of Textile and Apparel Designing, College of Community ScienceUniversity of Agricultural Sciences, Dharwad - 580 005, Karnataka, India
K. J. SANNAPAPAMMA Department of Textile and Apparel Designing, College of Community ScienceUniversity of Agricultural Sciences, Dharwad - 580 005, Karnataka, India

Keywords: Colour coordinates, Colour strength, Natural antioxidants, Vetiver

Abstract

Natural antioxidants are the substance that aims to delay the oxidative stress of the product and to make itsconditions optimal for a longer period of time. They are the chain breaking antioxidants which react with lipid radicals andconvert them into more stable products which are mainly phenolic in structures. Vetiver and chebula are the abundantlyavailable natural resources which possessed good amount of natural antioxidants. Three primary coloured (red, blue andyellow) vinyl sulphone (cold brand) plain woven reactive dyed cotton fabrics were used for the study. The variables usedfor optimization of plant extracts were media of extraction (aqueous and ethanol) and application of heat (heated andunheated) subjected to colour spectrophotometer to know about the colour strength and transmittance of the plant extracts.The optimized extracts were selected for finishing of reactive dyed cotton fabric with varied concentrations (5, 10 and 15%)at different temperatures (30°- 40° and 60°-70°) through zigger machine by exhaust method and later assessed for colourstrength and colour coordinates of reactive dyed cotton fabric. Irrespective of source and method of extraction the colourstrength was found to be greater in vetiver heated aqueous solution and chebula unheated aqueous solution compared to theethanolic solvent. It was observed that all the treated samples showed significant increase in colour strength with lesserreflectance values. The colour strength was found to be greater in red coloured fabric of both the plant extracts with variedconcentrations (5, 10 and 15 %) and temperatures (30°-40° and 60°-70°) followed by blue and yellow coloured treatedfabrics. The chebula treated blue coloured fabric exhibited greater colour difference on contrary with vetiver treated reactivedyed cotton fabric. As colour strength is very important parameter for dyeing, it was found that the natural antioxidanttreated fabrics exhibited greater colour with lesser colour difference values.