“…After 60 min of dyeing, the colour strength decreases with a further increase in the time of dyeing. This effect can be attributed to the shift in the equilibrium of colour strength if dyeing of fabric is carried out for a longer time (Shenai, 1997; Tayade and Adivarekar, 2013).…”
Purpose
Textile industry is considered to be one of the largest consumers of water. There needs to be an alternative for water in textile wet processing. Solvent dyeing can be an approach to replace the use of water in dyeing for water conservation.
Design/methodology/approach
In this study, the dyeing of polyester was carried out using conventional and solvent dyeing methods. The solvent used was non-aqueous, deep eutectic solvent (DES) prepared using choline chloride and urea. Dyeing parameters such as time, temperature and pH were optimized for a concentration of dye using the solvent and were compared with the conventional dyeing.
Findings
The prepared solvent was characterized in terms of Fourier-transform infrared resonance and 1H and 13C nuclear magnetic resonance to analyze the reaction between choline chloride and urea. Dyeing performance in terms of K/S and fastness properties of dyed fabrics were evaluated and found to be at par against conventional dyeing.
Originality/value
Use of DES as a dyeing medium is a novel approach in the textile industry.
“…After 60 min of dyeing, the colour strength decreases with a further increase in the time of dyeing. This effect can be attributed to the shift in the equilibrium of colour strength if dyeing of fabric is carried out for a longer time (Shenai, 1997; Tayade and Adivarekar, 2013).…”
Purpose
Textile industry is considered to be one of the largest consumers of water. There needs to be an alternative for water in textile wet processing. Solvent dyeing can be an approach to replace the use of water in dyeing for water conservation.
Design/methodology/approach
In this study, the dyeing of polyester was carried out using conventional and solvent dyeing methods. The solvent used was non-aqueous, deep eutectic solvent (DES) prepared using choline chloride and urea. Dyeing parameters such as time, temperature and pH were optimized for a concentration of dye using the solvent and were compared with the conventional dyeing.
Findings
The prepared solvent was characterized in terms of Fourier-transform infrared resonance and 1H and 13C nuclear magnetic resonance to analyze the reaction between choline chloride and urea. Dyeing performance in terms of K/S and fastness properties of dyed fabrics were evaluated and found to be at par against conventional dyeing.
Originality/value
Use of DES as a dyeing medium is a novel approach in the textile industry.
“…3, it can be observed that as temperature of dye bath increases the colour strength of dyed polyester fabric also increases up to equilibrium after which it decreases with increase in dyeing temperature. This variation may be ascribed to the shift of equilibrium of dye from fabric to dye bath (Kale et al., 2015; Ramezanzadeh et al., 2015; Tayade and Adivarekar, 2013). Thus, dyeing temperature of 130 °C was optimized for dyeing of polyester using GES as a solvent as there was no significant difference in colour strengths at 130 °C and 140 °C respectively.Fig.…”
Section: Resultsmentioning
confidence: 99%
“…As dyeing time increases colour strength also increases till dyeing equilibrium is achieved. Further colour strength decreases with increase in time of dyeing (Shenai, 1997; Tayade and Adivarekar, 2013). After 15 min and 45 min of dyeing, more or less similar colour strength was observed.…”
In the past decade, water scarcity has become major concern and is going to be reality in future too. At the same time textile is necessity which needs a billion liters of fresh water for its processing. Out of this 16 % of water is only used for dyeing of textile materials. In a quest to develop a sustainable approach to reduce water scarcity, an attempt has been made to minimize water consumption in textile wet processing. In this work, an eco-friendly glycerine based eutectic solvent (GES) was prepared by using choline chloride, urea and glycerin to reduce water consumption in polyester dyeing. The prepared solvent was characterized in terms of FTIR. Dyeing parameters like time, temperature and pH were optimized for dyeing of polyester using GES as a dyeing medium. The efficacy of dyeing was analyzed by colour strength and colour performance properties; sublimation, wash and light fastness. In comparison with conventional dyed polyester overall dyeing performance was found to be better without affecting tensile strength of polyester which remains almost same whereas thermal stability of solvent dyed polyester was slightly improved compared with aqueous dyed polyester. The results obtained from this study suggest that the GES as a polyester dyeing medium can be a green approach in dyeing of polyester.
“…Dyes obtained from different natural sources have been emerged as an important alternative to synthetic dyes (Tayade & Adivarekar, 2013). The interest in natural dyes is ascending because of lately discovered appropriate functions such as high exhaustion through different techniques (Ali, Nisar, & Hussain, 2007), environmental aspects (Karaboyac & Uğur, 2014), broad range of shades (Mongkholrattanasit et al, 2015), antioxidant (Yamazaki, 2002), antibacterial (Ratnapandian, Islam, Wang, Fergusson, & Padhye, 2013), mothproofing ) effects, compatibility with skin, eco-benign tanning system (Musa et al, 2010), improve the fastness properties (Rym, Farouk, & Bechir, 2016) and color strength (Khan et al, 2014), and optimization ones .…”
There is a growing need for eco-friendly mothproofing property owing to stringent environmental regulations. One type of insects responsible for critical damage of the usual protein wool fabric is the hide beetle Dermestes maculatus. In this research, efficient mothproofing procedure is introduced through natural dyeing of protein wool fabric with walnut hull and henna as environmental friendly dyes. The wool fabrics were first mordanted with aluminum sulfate and then dyed with walnut hull and henna dyes. The mothproofing properties of control, walnut hull, and henna-dyed wool samples were evaluated statistically. Mothproofing was assessed through the study of damages on wool surface by the larvae of hide beetle, Dermestes maculatus, as feeding protein fibers and wool weight loss (%) were measured. The damage intensity of wool fabric surface was confirmed with scanning electron microscopy images. The analysis of variance was utilized to obtain the optimum conditions for mothproofing. Further, reflectance and absorbance of wool samples were reported. Finally, the experimental results indicated highest protection against Dermestes maculatus on the both walnut hull and henna-dyed protein wool.
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