A Three-Bath Process for Dyeing Cotton with Bis-Azo Bi-Functional Reactive Dyes Based on Diazonium Salts

Hande, Pratik R.; Badve, P. P.; Dugane, Rajaram; Bhagwat, Sunil S.; Bhate, Prakash M.

doi:10.1007/s12221-020-1294-6

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…12 Couplers like J-acid or sulpho J-acid are expected to help in obtaining linear molecular structures. 3 Dyes 1 and 2 13 were prepared by bis-diazotisation of FC-acid followed by alkaline coupling with J-acid and γacid respectively while dyes 3 and 4 were prepared by bis-diazotisation of DABA followed by alkaline coupling with sulpho J-acid and sulpho γacid respectively (see Table 1).…”

Section: Direct Dyes Possessing Two Primary Aromatic Amino Groupsmentioning

confidence: 99%

“…Formation of a covalent bond with cellulose by using direct dyes possessing primary aromatic amino groups comparable to those exhibited by reactive dyes without increasing utility cost or process time. The dye in padding Bath I and auxiliary chemicals in all three baths can be reused in the next cycle of dyeing as described earlier 13 resulting in overall decrease in the effluent load while reducing costs. Thus, a continuous dyeing process based on our work has the potential of offering desirable dyeing at a lower cost.…”

Section: Advantages Offeredmentioning

confidence: 99%

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A process for dyeing cotton with direct dyes possessing primary aromatic amino groups furnishing wash fastness exhibited by reactive dyes

Hande

Kulkarni

Adivarekar

et al. 2021

Coloration Technology

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Direct dyes are inexpensive water soluble anionic dyes, when dyed from aqueous solution in the presence of electrolytes are substantive to cotton. 1,2 Dyeing with direct dye depends on physical adsorption of dye molecules onto the cellulose fibre. 3,4 The linear molecular structure of the direct dye aligns itself on the surface of the cellulose fibre and binds it through van der Waals forces and hydrogen bonds. [5][6][7] Direct dyes get adsorbed through cavities present in the cotton fibre and form aggregates. Due to the size of the molecule, these aggregates remain trapped inside the cotton fibre. 8 Physical forces are not the strongest known binding forces between molecules. Thus, cotton dyed with direct dyes runs colour when washed. Typical direct dyes such as Scarlet 4BS

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Section: Direct Dyes Possessing Two Primary Aromatic Amino Groupsmentioning

confidence: 99%

Section: Advantages Offeredmentioning

confidence: 99%

A process for dyeing cotton with direct dyes possessing primary aromatic amino groups furnishing wash fastness exhibited by reactive dyes

Hande

Kulkarni

Adivarekar

et al. 2021

Coloration Technology

View full text Add to dashboard Cite

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Study on enhancing the union dyeing of cotton/modal blended fabrics with cationic modifier

Hao,

Chen,

et al. 2024

Coloration Technology

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Cotton/modal blended fabrics are favoured by the market because not only do they have the advantages of the dimensional stability of cotton and drape wear resistance of modal, they also overcome their shortcomings, displaying a sense of stiffness and smooth feel. However, because of the differences in the physical and chemical properties between each component, the dyeing of blended fabrics with reactive dyes is prone to problems such as low fixation percentage, different dyeing percentages and colour depth. Here, two cationic modifiers, 2,3‐epoxypropyltrimethyl ammonium chloride (GTA) and methaacryloyloxyethyltrimethyl ammonium chloride (DMC), were applied for cationic modification of cotton/modal blended fabrics, and their role in the dyeability and union dyeing of cotton/modal blended fabrics was studied. The results showed that the K/S and fixation percentage of the blended fabric treated with GTA and DMC cationic agents could be significantly improved compared with the control group, and that the colour fastness of the blended fabric can reach grade 4‐5. Compared with GTA, DMC‐modified cotton/modal blended fabric showed better union dyeing properties because of its better diffusion performance in the fibre. The mesoporous volume of the cotton fibre is higher than that of the modal fibre, while the micropore volume is the opposite. Consequently, DMC macromolecules, through free radical graft polymerisation, were more likely to diffuse into cotton fibres with more mesoporous content, increased the interaction force between anionic reactive dye and cotton fibre, and improved the dyeability of the cotton component and the union dyeing performance of the blended fabric.

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Bi-functional Cold Brand Reactive Dyes with Urea as a Bridge Group: Synthesis, Characterization and Dyeing Performance on Various Fibers.

Rathod,

Patel,

Parmar

et al. 2023

Orient. J. Chem

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Bi-functional reactive dyes from the Cold brand that have exceptional dyeing capabilities. The intermediate for bi-functional cold-brand reactive dyes is 3, 3’-Disulpho-4, 4’-diamino diphenyl urea, which is synthesized through the interaction of one mole of urea aqueous solution with two moles of 1, 4-diaminobenzene-2-sulphonic acid. In this bi-functional reactive dye system, urea was utilized as a bridge molecule to give the reactive dyes significant water solubility. Incorporating various cyanurated coupling components, different colors are produced. It has good dyeing properties and provides a wide spectrum of shades on various fibres.

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A Three-Bath Process for Dyeing Cotton with Bis-Azo Bi-Functional Reactive Dyes Based on Diazonium Salts

Cited by 3 publications

References 5 publications

A process for dyeing cotton with direct dyes possessing primary aromatic amino groups furnishing wash fastness exhibited by reactive dyes

A process for dyeing cotton with direct dyes possessing primary aromatic amino groups furnishing wash fastness exhibited by reactive dyes

Study on enhancing the union dyeing of cotton/modal blended fabrics with cationic modifier

Bi-functional Cold Brand Reactive Dyes with Urea as a Bridge Group: Synthesis, Characterization and Dyeing Performance on Various Fibers.

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