A novel approach for dyeing of polyester using non-aqueous deep eutectic solvent as a dyeing medium

Abstract

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.

Soybean Oil and Nonthermal Plasma Pretreatment to Dye Para‐Aramid Woven Fabrics with Disperse Dye Using a Glycerol‐Based Dye Bath

“…The use of glycerol, especially crude glycerol that could be reused or recycled in the textile industry, favors finding new uses of glycerol. The textile industry could save enormous amounts of water resources, eliminate the use of toxic specialty chemicals, promote more environmentally friendly and sustainable practices, and reduce costs (Pawar et al, 2019).…”

Salts and water‐free dyeing of cellulose nanofibers using novel green deep eutectic solvents: Isotherm, kinetics, and thermodynamic studies

“…Each type of reactive dye shows a better color yield on CNF in DES compared to CN dyeing medium, the probable reason for this may be due to cations of DES that increase the substantivity of reactive dye towards CNF. 24,37 The DES used for dyeing consist of choline chloride in the form of salt, which was the reason to facilitate higher color strength.…”

“…The hydrophilic characteristic of DES increases the hydrophilicity of CNF substrate, which leads to increase in swelling property of CNF. 24,34 While higher temperature leads to increase volume of CNF, which could be reason of higher diffusion coefficient in DES dyeing. 35…”

“…Recently many DES are recyclable and available at low cost for treating textile materials for dyeing. 24,25 Scientists suggests these DES as an alternate for conventional dyeing medium, which is full of environmental-friendly. DES-based on choline chloride and ethylene glycol is either neutral or cationic in nature.…”