Dispersant-free disperse dyes for polyester an eco-friendly approach

Madiwale

et al. 2020

RJTA

Purpose Dyeing of silk fabric was studied to increase dye uptake using eco-friendly glycerine based eutectic solvent (GES), which acts as a swelling agent. Design/methodology/approach The swelling behaviour of silk fabric in GES was analyzed using three-dimensional laser scanning microscope. Dyeing parameters such as time, temperature and GES concentration were optimized using design of experiments. Findings In total, 5.34 F-value and 0.0014 p-value of ANOVA represent that the model is significant. An optimized GES assisted dyeing was carried out with two different classes of dyes such as Acid Blue 281 and Acid Red 151 and further compared with that of conventional aqueous dyeing method. Originality/value At 70°C, silk fabric achieves desired colour strength after 35 min of dyeing (10 min lesser than conventional) using GES assisted dyeing method. % Dye exhaustion of GES assisted dye bath was carried out and found to be very good. Fastness properties such as washing, light and rubbing fastness of conventional and GES assisted dyed silk fabric showed comparable results.

Section: Solvent Assisted Dyeing Of Silk Fabricmentioning

confidence: 99%

Solvent assisted dyeing of silk fabric using glycerine based eutectic solvent as a swelling agent

Madiwale

et al. 2020

RJTA

Polymers for Advanced Techs

“…To recycle soluble dispersants, thermal or chemical separation methods are effective methods, but need much more energy and chemicals consumption. Most reported temporarily soluble disperse dyes, including β‐sulphatoethylsulphonyl, sulfomethyl groups, are acceptable solutions for dispersant‐related issues, which is water‐soluble at room temperature, and show affinity for hydrophobic fiber during dyeing processes 9,10 . But hydrolysis degree of temporarily solubilized disperse dyes is difficult to control, 20% of unhydrolyzed dye would be left in dye bath approximately.…”

Section: Introductionmentioning

confidence: 99%

Novel dispersant‐free disperse dyes containing polyethylene oxide moieties: Synthesis and eco‐friendly dyeing on polyethylene terephthalate fabrics

Gao

Qian

et al. 2022

To reduce pollutant emission during dyeing process with disperse dyes, novel disperse dyes containing polyethylene oxide moieties were synthesized. The amphiphilic PEG 400 was engaged in nucleophile substitution with prepared N‐ethyl‐N‐phenylglycinoyl chloride to give coupling component containing polyethylene oxide. Diazonium salts were reacted with synthesized coupling component to obtain aimed eco‐friendly disperse dyes. Fourier transform infrared and 1H‐nuclear magnetic resonance method were used to manifest structures of synthesized dyes and their intermediates. These dyes were applied on polyethylene terephthalate (PET) fabric using traditional high temperature dyeing method under pressure. Dyeing process with and without dispersants were compared, the synthesized dyes showed no dependency on dispersants. Dyed PET fabrics using dispersant‐free methods exhibited excellent levelness, excellent washing and rubbing fastness. Quantum simulations were applied to evaluate structure–property relationship of designed dyes. The optimized geometries of designed dyes and electrostatic potential energy diagrams of molecules were simulated by density functional theory method to explain dye‐fiber interaction. The designed dispersant‐free disperse dyes exhibited no dependency on dispersants and excellent rubbing and washing fastness. Reduction of dispersants could help to eliminate environmental damage related to discharge of effluent containing dispersants.

“…Its dyed or printed fabrics have high antibacterial efects and colorfastness. In addition, since 1922, some researchers have studied ceaselessly temporarily solubilized disperse dyes with water-soluble groups that difered from conventional disperse dyes [10][11][12]. As a result, they are dispersantfree in use and predictably benefcial to the environment.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ultrafine Disperse Dyes Based on the Efficiency Balance of Grinding and Dyeing

Qiu

Liu

2022

Journal of Chemistry

As dispersive dyes are nonionic dyes, the particle size and particle-size distribution will significantly affect the dyeing performance. In this study, the grinding conditions, the granularity of disperse dye, and the dyeing performance were combined to study their connection further and to get better grinding process parameters for monoazo-structure disperse dyes. Through experimental research on three factors, namely, grinding time, size of grinding media, and mass ratio of grinding media to dyes, the preferred results are as follows, which could be selected based on different grinding purposes in detail. The grinding media group is Φ1 mm/Φ0.1 mm (1 : 1 mass ratio) or Φ3 mm/Φ1 mm (1 : 1 mass ratio), the mass ratio of grinding media to dyes is 5 : 1 or 10 : 1, and the grinding time range is 2–5 h. These parameters can make the overall work of coarse dyes’ grinding and dyeing more efficient, avoiding the waste of cost and the increase in workload.