Effects of reductive stripping of reactive dyes on the quality of cotton fabric

Mohammad Gias Uddin,Md Mazedul Islam,Md Rashedul Islam

doi:10.1186/s40691-015-0032-y

Mohammad Gias Uddin, Md Mazedul Islam + Show 1 more

Open Access

https://doi.org/10.1186/s40691-015-0032-y

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Abstract

AbstractSome common problems of textile dyeing industries include uneven or faulty dyeing and formation of color patches on the fabric surface during dyeing and downstream processing of textiles materials. Such problems in the finished quality of fabric are generally tackled through a chemical stripping process which is a common practice in dyeing industries for the deep shade batches. However, reactive dyes cannot be stripped satisfactorily from cellulosic materials due to the formation of co-valent bonds between dye and fiber. This research was undertaken using 2.5% and 5% bi-hetero reactive dyes on pretreated cotton fabric and dye stripping was carried out in alkali reductive stripping process. The aim of the work was to investigate the effects of dye stripping on the quality of cotton fabric. Strength loss, weight loss, pilling resistance and absorbency of stripped fabric were calculated. Though with the increase of concentration of stripping chemicals and temperature, stripping percentages were improved; processing damage to the fabric such as losses in strength, weight and pilling resistance ratings was found. In contrast, increased fabric absorbency was found due to stripping. This is explained that during stripping, alkaline solution as an intracrystalline swelling agent is effective in loosening the crystalline region of cotton in addition to the amorphous region. Stripping agent can also attack such crystalline region. As a result, cotton fiber can release maximum number of hydroxyl groups which previously formed covalent bonds. This is the reason behind the stripped fabric having more water absorbency.

Highlights

Around 10,000,000 tons of synthetic dyes are annually used in the world (Ghorpade et al 2000; Goodarzian and Ekrami 2010; Saravanan et al 2014) by various industries for coloring numerous materials
Some common problems of textile dyeing industries include uneven or faulty dyeing and formation of color patches on the fabric surface during dyeing and downstream processing of textiles materials (Fono and Montclair 1980; Ogulata and Balci 2007). Such problems in the finished quality of fabric are generally tackled through a chemical stripping process which is a common practice in dyeing industries for the deep shade batches
Alkaline reductive stripping affects the quality of fabric as harsh chemicals such as sodium hydrosulphite and sodium hydroxide as well as high temperature is applied in the stripping process, but the effects are at what extent? The aim of this study was to evaluate such effects of dye stripping on the quality of fabric

Summary

Introduction

Around 10,000,000 tons of synthetic dyes are annually used in the world (Ghorpade et al 2000; Goodarzian and Ekrami 2010; Saravanan et al 2014) by various industries for coloring numerous materials. Over 10,000 dyes with an annual production of over 7 × 105 metric tons are commercially available for use by this industry (Campos et al 2001). Some common problems of textile dyeing industries include uneven or faulty dyeing and formation of color patches on the fabric surface during dyeing and downstream processing of textiles materials (Fono and Montclair 1980; Ogulata and Balci 2007). Such problems in the finished quality of fabric are generally tackled through a chemical stripping process which is a common practice in dyeing industries for the deep shade batches.

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