Dyeing of Polyester and Nylon with Semi-synthetic Azo Dye by Chemical Modification of Natural Source Areca Nut

Ashitosh B Pawar,Sandeep P More,R V Adivarekar

doi:10.1007/s13659-017-0144-8

Ashitosh B Pawar, Sandeep P More + Show 1 more

Open Access

https://doi.org/10.1007/s13659-017-0144-8

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Abstract

Various azo compounds (Modified dyes) have been synthesised by chemical modification of areca nut extract (epicatechin), a plant-based Polyphenolic compound to get semi-synthetic dyes. Three different primary amines namely p- nitro aniline, p-anisidine and aniline, were diazotized to form their corresponding diazonium salts which were further coupled with an areca nut extract. Preliminary characterization of the areca nut extract and the resultant azo compounds (Modified dyes) was carried out in terms of melting point, solubility tests, thin layer chromatography, UV–Visible and FTIR spectroscopy. These modified dyes were further applied on polyester and nylon fabrics and % dye exhaustion was evaluated. Dyed fabrics were further tested for their fastness properties such as wash fastness, rubbing fastness, light fastness and sublimation fastness. The results of the fastness tests indicate that, all the three modified dyes have good dyeability for polyester and nylon fabrics. The dyed fabrics were also tested for ultraviolet protection factor which showed very good ultraviolet protection.

Highlights

There is growing awareness about sustainable wet processing of textiles which requires equal consciousness towards economic, social and environmental relevance of the processes and products used therein
Preliminary characterization of the areca nut extract and the resultant azo compounds (Modified dyes) was carried out in terms of melting point, solubility tests, thin layer chromatography, UV–Visible and FTIR spectroscopy. These modified dyes were further applied on polyester and nylon fabrics and % dye exhaustion was evaluated
The dyed fabrics were tested for ultraviolet protection factor which showed very good ultraviolet protection

Summary

Introduction

There is growing awareness about sustainable wet processing of textiles which requires equal consciousness towards economic, social and environmental relevance of the processes and products used therein. There are stringent environmental regulations to follow of varying degree of severity imposed by many countries in response to the hazardous effluent generated during synthesis as well as during its use in coloration due to unexhausted dyes. There is resurgence in the interest in the natural dyes and again textile researchers are being engrossed in experimenting with natural dyes for coloration being renewable and non-toxic [1, 2]. Natural dyes do have some inherent limitations such as poor tinctorial strength, lack of reproducibility, inferior fastness properties and un-exhausted metallic mordants in the residual dye bath posing serious challenges to the environment [3,4,5,6,7,8]. Chemical modification of the natural dyes can overcome some of these inherent challenges to make them preferred choice under prevailing scenario

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