Synthesis and application of disazo reactive dyes derived from sulfatoethylsulfone pyrazolo[1,5-a]pyrimidine derivatives

Youssef, Y. A.; Kamel, M.; Taher, Mohamed S.; Ali, N.F.; Megiede, Saadia A. Abd El

doi:10.1016/j.jscs.2011.06.015

Cited by 21 publications

(7 citation statements)

References 20 publications

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“…Table 2 also shows that, the colorimetric data (L*, a* and b*) of different fibers dyed with different extracted dye concentration. From these data we can be concluded that increasing of the extracted dye concentration, accompanied by decreasing of L* values and thus color of samples got darker by growing the dye concentration, a* and b* values increased in the positive direction [17] The color of dyed wool fibers turned to more reddish yellow color and became darker with increasing the dye concentration from 0.5% to 2% and thereafter a* values and b* values slightly decreased. From Fig.…”

Section: Color Extractionmentioning

confidence: 78%

Dyeing properties of wool fibres dyed with Rhubarb as natural dye via ultrasonic and conventional methods

et al. 2018

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T HE utilization of ultrasonic waves in textile coloration processing possesses many hopeful advantages. Conventional method in dyeing processes consumes a large amount of dye and thermal energy. The dyeing processing is exclusively carried out at higher temperatures. Ultrasonic dyeing is a novel technique to save time, cost, energy and provides high value of dye uptake. The aim of this study was to investigate the dyeing behavior of pre-treated wool fibers with chitosan, then dyed with rhubarb as natural dye by conventional (Con) and ultrasonic (US) methods. Factors affecting the dye extraction and dyeing processes such as dye concentration, temperature, time as well as pH was studied. The results indicated that the pre-treated wool fibers with chitosan get higher color strength (K/S), and all over color fastness properties values if it compared with the untreated fibers. Pre-treated wool fibers can be dyed at lower temperatures in ultrasonic method as compared with conventional method. In this study the antimicrobial activity with some kinds of Bacteria and Fungi were verified. The results demonstrated that the pre-treated fibers exhibit higher inhibition percent than the untreated one. As a result, the utilization of ultrasonic waves in dyeing procedure helps to decrease the dyeing temperature, thereby reducing energy consumption and maintaining the extracted and dyeing quality.

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Section: Color Extractionmentioning

confidence: 78%

Dyeing properties of wool fibres dyed with Rhubarb as natural dye via ultrasonic and conventional methods

et al. 2018

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“…Also, reactive dyes have the advantages of bright colour, a variety of hues and a convenient production process, which makes them the main class of dyes for cotton dyeing. The nature and number of reactive groups affects the exhaustion and fixation of the dyes . Usually, bifunctional dyes have a higher fixation than those with only one reactive group…”

Section: Introductionmentioning

confidence: 99%

Synthesis and application of KM‐type reactive dyes containing 2‐ethoxy‐4‐chloro‐s‐triazine

Zhang

Xiong

Zhang

et al. 2019

Coloration Technology

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A new kind of hetero‐bifunctional reactive dye containing 2‐ethoxy‐4‐chloro‐s‐triazine, with better activity matching with β‐hydroxyethyl sulphone sulphate at a low fixation temperature, was successfully synthesised and characterised. An ethoxy group was designed to be introduced into triazine to increase the substantivity and the reactivity of the dyes. Thereby, the fixation of mono‐s‐chlorotriazine/hydroxyethyl sulphone sulphate (KM‐type) bifunctional reactive dyes on cotton was improved, and dyeing under mild conditions with high fixation was realised. Nineteen dyes with orange, red and blue colours were synthesised and characterised by UV‐Vis and infrared spectroscopy and mass spectrometry. Synthesised dyes were dyed at 60, 75 and 90°C, respectively. Exhaustion and reactivity for all of the ethoxy‐containing KM‐type dyes was over 90% at the optimal temperature, and fixation was over 87%, which was higher than the ethoxy‐free comparative dyes. The optimal fixation temperature of ethoxy‐containing dyes was initially reduced to 75°C, and then to 60°C. Compared with comparative dyes, the wash fastness and light fastness were basically unchanged, and the wet rub fastness of the H‐acid series was reduced by one grade.

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“…There is an increasing trend in the colour output with increasing pH values which is due to the fact that vinyl sulfone (VS) based reactive dyes works better on alkaline pH, which was in accordance to the colour output results of the reactive dyes. Results obtained by Youssef et al 13 demonstrated high substantivity rate to the cotton fabric at high pH values due to covalent binding linkages between the dye and fiber. Consequences of colour strength values for dyes at optimum pH = 9 were higher, due to the rate of hydrolysis of the reactive group became lower at higher pH.…”

Section: Effect Of Dyeing Temperatures On Colour Strengthmentioning

confidence: 93%

Synthesis of Vinylsulfone Based Poly Anchor Reactive Dyes and their Applications on Cotton Fabric

Ahmad¹,

Bhatti²,

Bhatti³

et al. 2013

Asian J. Chem.

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Reactive dyes are extensively used worldwide in textile industry not only to colour cotton but also wool and polyamide fibers because of their variety of colour shades, brilliant colours, high wet fastness properties and ease of application. A steady increase in reactive dye usage has been observed as a result of higher demand of cotton wear globally. For reactive dye the reaction between the reactive group, dichlorotriazinyl and the fiber involve a nucleophilic addition and substitution mechanism. Burkinshaw and Kabambe 1 accounted that for the dyeing of cotton fabric, pH of the dye solution and equilibrium concentration of cellulosate ions are increased as a result of formation of a covalent bond between the dye and the cellulosic fabric/cotton. However, due to the competition between the Cell Oas well as OHions in the dye bath at high pH, a portion of the dye reacts with OHions instead of the cellulosate ions on the fiber which results in hydrolysis, reported by Epolito et al. 2 .Dyes can be classified by different means e.g. based upon their applications or on the basis of functional group present. According to application techniques by Kirk et al. 3 , dyes may be classified as acid dyes, basic dyes, azoic dyes, direct dyes, mordant dyes, lake or pigment dyes, sulfur dyes, vat dyes, disperse dyes and reactive dyes. Among the varieties of dyes,

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Synthesis and application of disazo reactive dyes derived from sulfatoethylsulfone pyrazolo[1,5-a]pyrimidine derivatives

Cited by 21 publications

References 20 publications

Dyeing properties of wool fibres dyed with Rhubarb as natural dye via ultrasonic and conventional methods

Dyeing properties of wool fibres dyed with Rhubarb as natural dye via ultrasonic and conventional methods

Synthesis and application of KM‐type reactive dyes containing 2‐ethoxy‐4‐chloro‐s‐triazine

Synthesis of Vinylsulfone Based Poly Anchor Reactive Dyes and their Applications on Cotton Fabric

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