A novel and eco‐friendly approach for dyeing polyester fabrics by liquid disperse dyes treated with deep eutectic solvent

Abstract

Disperse dyes do not contain water‐soluble groups and are difficult to dissolve in water, so they cannot be directly formulated into dyeing liquor. In the current dyeing process, the solubility of disperse dyes is mainly improved by adding dispersants. However, dispersants are not absorbed by fibres and survive in the dyeing effluent, aggravating the pollution of water bodies and causing difficulties in treatment. Therefore, the development of a novel, eco‐friendly dyeing approach is important to overcome these problems. Herein, for the purpose of improving the solubility of disperse dyes and reducing the dosage of dispersants, a deep eutectic solvent consisting of choline chloride/ethylene glycol was employed instead of dispersant to dissolve CI Disperse Blue 79 and CI Disperse Red 343, thus forming liquid disperse dyes. The results show that both CI Disperse Blue 79 and CI Disperse Red 343 were well dissolved in choline chloride/ethylene glycol with excellent stability, and the dissolution behaviour was strongly associated with the dissolution temperature and time. Moreover, polyester fabrics can be dyed successfully with liquid disperse dyes, and it was observed that the K/S value and rubbing fastness were evidently improved at the same dyeing temperature with unchanged colour characteristics, and a higher K/S value could still be obtained by lowering the dyeing temperature. This work establishes a green dyeing process, which reduces dyeing costs and meets the demand for environmental protection. It is also expected to realise the liquid state of disperse dyes, which will help to promote the further development of textile dyeing.

The Sustainable Bioactive Dyeing of Textiles: A Novel Strategy Using Bacterial Pigments, Natural Antibacterial Ingredients, and Deep Eutectic Solvents

“…Therefore, these results demonstrate the potential of the gel-based D water-free dyeing medium that is able to decrease the enormous amo required for the dyeing process. In addition, these new dyeing m simultaneously be used as a mordant, providing better absorption and fastn [3,6]. For example, Zheng et al used a ChCl/Ethylene glycol DES to dissolve Therefore, these results demonstrate the potential of the gel-based DES to act as a water-free dyeing medium that is able to decrease the enormous amounts of water required for the dyeing process.…”

“…Recently, gel-based DESs have received increasing attention as a promising green alternative to conventional solvents in order to extract specific alkaloid compounds from different sources, namely from plants, like proline/oxalic acid (1:1), ChCl/LA (1:2), and ChCl/Fructose (5:1) [32][33][34]. In addition, gel-based DESs that are prepared from a hydrogen bond acceptor and a hydrogen bond donor, such as ChCl/urea/glycerol and ChCl/ethylene glycol, can act as water-free solvents that are able to dissolve dyes without changing their dyeing properties [6]. Hence, in this study, the gel-based ChCl/LA (1:2) DES mixture was selected as a dyeing medium for the first time to dissolve the crude gel prodigiosin pigment, a bacterial alkaloid, as it has previously been used to extract alkaloids from plants.…”

“…For example, Zheng et al used a ChCl/Ethylene glycol DES to dissolve Therefore, these results demonstrate the potential of the gel-based DES to act as a water-free dyeing medium that is able to decrease the enormous amounts of water required for the dyeing process. In addition, these new dyeing mediums can simultaneously be used as a mordant, providing better absorption and fastness properties [3,6]. For example, Zheng et al used a ChCl/Ethylene glycol DES to dissolve disperse dyes without changing their chemical structure and original dyeing properties.…”

“…Therefore, in this study, the amino acid L-Cysteine (L-Cys), widely used as a reducing agent, was tested as a new natural bio-mordant, which has not been applied before to the best of our knowledge. Additionally, gel-based deep eutectic solvents (DESs), formed by a hydrogen bond donor and a hydrogen bond acceptor, which have been aimed to be used as novel environmentally friendly and water-free dyeing mediums, gained our attention due to their ability to improve color fastness properties without changing dyeing properties [6,7].…”

Chemically Modified Extract of Peanut Red Skin: Toward Functional Dyeing of Textile Fabrics and Study Adsorption Kinetics and Adsorption Isotherm of Dyeing Process

“…Dyeing of polyester produces a significant volume of water that is tainted with dye, which is extremely harmful to the environment. 90,91 Thus, the main challenge in the dyeing industry is the application of one dye to different fabrics. In dyeing textiles, it is necessary to apply heat to complete the dyeing process.…”