Technical facts of reactive dyes (original) (raw)
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Dyeing of cotton fabrics with reactive dyes and their physico-chemical properties
Indian Journal of …, 2008
The effect of dye concentration, electrolyte concentration, dyeing time and dyeing temperature on dyeing performance of cotton fabric dyed with reactive dyes, viz. Reactive Red 6B and Reactive Yellow RL, has been studied. The dye absorption increases with the increase in electrolyte concentration, dyeing time and dyeing temperature but decreases with the increase in dye concentration. Considering the effects of various external influences on the dyed cotton fabric, it has been observed that the Reactive Yellow RL imparts better physico-chemical properties than Reactive Red 6B in most cases.
Effect of Functional groups of Reactive dyes on the Dyeing Properties of Cotton Knit fabric
2022
Maximum natural textile substrates are dyed with reactive-based dyes. The exercise of this dye is progressed in an elevated celerity for its moderate to good light fastness, simple and variant dyeing methods, and an apparition of many bright colors. A trichromatic mixture of dyes of the same reactive group is always preferred. In this research work, single jersey cotton knitted fabric was dyed with the same amount [2%] of reactive dyes (red, yellow & blue) of different functional groups (Mono-functional; Triazine and Vinyl sulphone, Bi-functional; Pyrimidine and Vinyl Sulphone and poly-functional). Colorfastness (wash, rub, perspiration and light) of dyed fabrics were evaluated. Bursting strength was also measured for different functional groups. It was found that Reactive dyes of MCT and Bi-Functional groups showed better rubbing, light fastness, and bursting strength properties than other functional groups.
A Concise Theoretical Aspect of Reactive Dyeing and Solvent Dyeing
2023
Reactive dyes are particularly popular for cellulosic fiber and clothes since they are ecologically friendly and have strong general fastness qualities as well. But the application of this sort of color needs a very high concentration of salt. The salt discharged from the dyeing bath raises salinity in the drain water stream, which significantly damages environmental ecology. This review describes how to reduce the use of chemicals during the dyeing of cotton items using reactive dyes to replace the procedure of solvent dyeing. Therefore, this dyeing procedure might be a potential option for cleaner cotton manufacturing.
Study of some important properties of Reactive Dyeing on 100% cotton fabric
Some important properties of reactive dyeing such as rate of exhaustion, rate of fixation, migration, levelness, and wash fastness to color are responsible to provide fault free and right first time dyeing in production. In this experiment, these important properties were studied on 100% cotton knitted fabric with five reactive dyes by exhaust method. Rate of exhaustion was evaluated by measuring optical density following Lambert-Beer's laws and rate of fixation, migration rating were evaluated by measuring K/S values following Kubelka-Munk equation and levelness and wash fastness to color were evaluated by measuring DE CMC values and color staining to multifibre were established by Spectrophotometer (Data color, 650 TM).In this study it was found that all dyed fabrics showed medium to high exhaustion-fixation, good migration, level dyeing, good wash fastness to color. This study showed that these dyes were adequate to provide fault free and right first time dyeing in production and could reduce effluent cost.
Trends in the synthesis and application of some reactive dyes: A review
Brazilian Journal of Science
From last 25 years that many researchers have developed the novel reactive dyes with modification in structure of reactive dyes. In the present review paper concentrated development of reactive dyes. The review paper is focused on the highlight such dyes have having excellent dyeing properties and wet-fastness properties. This review paper express the monstrous impression of reactive dyes on the textiles coloration industry. Particularized details are given regarding evolution in the chemistry of reactive structure systems. It is additionally mentioned pointed out that advance research is mandatory to enhance dye fixation and wet-fastness properties. Reactive dyes have been used for the past hundred years for dyeing of cellulosic fabrics. A reactive dye has a chromophore, which is a group or an atom that is responsible for the dye’s colour. It has a component which reacts with the fabric or substrate. They have excellent fastness features due to the presence of covalent bonds that t...
In this colorful world, the beauty of dreams is effervesced by hundreds of man-made dyes on which Reactive dyes is in crest position. Maximum natural textile substrates are wafted by this pukka reaction-based dye. The exercise of this dye is progressed in an elevated celerity for its moderate to good light fastness, simple and variant dyeing methods and apparition of many bright colors. Over and above, Reactive dyes inflict good wash fastness at wet processing. Still sometimes buyers make assertions about bad wash fastness of reactive dyes for inadequate removal of unreacted and hydrolyzed dyes from surface of the substrates. The volition of dyes in this case is very important. A trichromatic mixture of dyes of same reactive group is always preferred. But recently metamerism becomes a big prerequisite for many renowned buyers to maintain. In those cases, dyes of same reactive group cannot be conserved. Therefore outcome on color fastness to wash, tonally change and color strength during washing becomes unknown. In this paper, this incognito effect is tried to be investigated a little. Dyeing is performed by mixing dyes of same functional group and different functional groups. Then color fastness to wash at different stages is observed.
Evaluate the dyeing performance of silk fabric by using four different reactive dyes
2019
Reactive dyes are extensively used for dyeing and printing cellulosic materials and blends containing cellulosic portion. [1] This is the reason behind the fact that researches on synthesis and development of reactive dyes,[2] improvement of their application possibilities and procedures has been practicing mostly by dyers, chemist & engineers.[3] It has also been found
Dyeing of cotton using reactive dyes without Salt
In this study 3-chloro-2-hydroxypropyl trimethyl ammonium chloride was used as a cationic agent to cationize cotton fabric by a pad-batch process. The cationized cotton samples were dyed with different reactive dyes containing various reactive groups. The dyeability of the cationized cotton samples with reactive dyes without salt was significantly improved due to an increase in the ionic attraction between the dye and cationized cotton. The results showed that the wash and dry rubbing fastness of the cationized cotton dyed with different reactive dyes are similar to those of the untreated cotton. However, the light fastness of some of the cationized fabric samples was improved.
Dye-Fibre Bond Stabilities of Some Reactive Dyes on Silk
Journal of The Society of Dyers and Colourists, 2008
57th Communication on Investigations in Textile Chemistry, for 56th Communication see ref. J.Silk was dyed with twelve reactive dyes containing various reactive groups. The dyeings were thoroughly extracted so that all non-covalently bonded dye was removed. The extracted dyeings were treated with buffer solutions in the pH range 1.89 to 10.65 at 70°C for 24 h. The exhaustion, fixation ratio and extent of reaction of the dyeings and the rate of hydrolysis of all dyed samples in six buffers were measured. The dye-fibre bond was found to be sufficiently resistant to hydrolysis for ail dyeings. The fixation ratio and wet fastness were particularly good for dyeings with α-bromoacrylamide groups and with difluorochloropyrimidine groups.
Dyeing cotton with reactive dyes under neutral conditions
Coloration Technology, 2007
This paper describes a new method to dye cotton with selected reactive dyes by long-liquor -or so-called 'exhaustion' -processes under neutral conditions. Particularly promising results were obtained with reactive dyes containing free vinyl sulphone residues. Although there are dyes on the market that contain free vinyl sulphone groups, for example, the Novacron C (Huntsman) range of dyes, many of this class contain 'blocked' vinyl sulphone residues; examples include sulphatoethylsulphone or chloroethylsulphone precursor groups, and these may be preactivated to the highly reactive vinyl sulphone form simply by a mild alkali treatment. After this activation, neutral, long-liquor dyeings can be carried out at the boil in the presence of electrolyte. This new dyeing method gave very good results in terms of overall fixation efficiency values, without the need for alkali additions.