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Syntheses of anthraquinonoid disperse dyes containing s-triazine moiety and their application on polyester fibre

2016-07-20T05:47:01Z

Title: Syntheses of anthraquinonoid disperse dyes containing s-triazine moiety and their application on polyester fibre Authors: Modi, B R; Desai, N R; Mistry, B D; Desai, K R Abstract: Twenty anthraquinonoid disperse dyes, viz. 2-(p-nitroanilino)-4 arylureido-6-[4'-(p-N-morpholineanilino)anthraquinone-1'-yl-amino]-s-triazines (IXa-j) and 2-(p nitroanilino)-4-arylthioureido-6-[4'-(p-N-morpholineanilino) anthraquinone-1'-yl-amino]-s-triazines (Xa-j) were prepared by condensing the sodium salt of bromamine acid (I) with N-morpholinoaniline (II) followed by desulphonation and reaction with cyanuric chloride, p-nitroaniline and then with various arylureas (VIIa-j) and arylthioureas (VIIIa-j). These compounds when applied on polyester fibres gave maroon and brown shades with moderate to good light fastness, good to excellent wash fastness and very good to excellent exhaustion. Page(s): 211-214

Syntheses of 4-arylazo-5-[acetamido/N-(β-cyanoethylamino )]-acenaphthenes and their dyeing performance on polyester and polyamide fibres

2016-07-20T05:46:06Z

Title: Syntheses of 4-arylazo-5-[acetamido/N-(β-cyanoethylamino )]-acenaphthenes and their dyeing performance on polyester and polyamide fibres Authors: Rangnekar, D W; Lokhande, S B Abstract: 4-Arylazo-5-acetamido acenaphthenes (Va-f)and 4-arylazo-5-N-(β-cyanoethylamino)acenaphthenes (VIa-f) were prepared from 4-arylazo-5-aminoacenaphthenes (IVa-f)-by acetylation and cyanoethylation respectively. The compounds IVa-f were obtained by coupling 5-aminoacenaphthene (II) with aryl diazonium salts (IIIa-f). The compounds Va-f and VIa-f when applied on polyester and polyamide fibres as disperse dyes gave golden yellow to scarlet shades with good pick-up and moderate light fastness. These compounds also exhibited very good sublimation fastness on polyester fibres. Page(s): 207-210

Studies on dyeing with natural dye Juglone (5-hydroxy-1,4-naphthoquinone)

2016-07-20T05:44:47Z

Title: Studies on dyeing with natural dye Juglone (5-hydroxy-1,4-naphthoquinone) Authors: Gupta, Deepti Bahl; Gulrajani, M L Abstract: Five fibrous substrates, viz. wool, human hair, silk, nylon and polyester, were dyed till equilibrium with Juglone (5-hydroxy-1, 4-naphthoquinone), a natural dye obtained from the hulls of raw walnut, and the kinetics and thermodynamics of dyeing were studied. The isotherms obtained for all the fibres were linear, indicating a partition mechanism of dyeing. The slope of isotherms increased with the increasing temperature in all the cases except wool, where it was independent of temperature. The standard affinity of Juglone for hydrophobic fibres was higher than that for hydrophilic fibres. ΔHᵒ and ΔSᵒ values were positive for all the dyeings. The apparent diffusion coefficient was highest for wool and lowest for silk. Page(s): 202-206

Fixation of reactive prints on silk by sodium silicate pad-batch technique-Reaction mechanism

2016-07-20T05:43:17Z

Title: Fixation of reactive prints on silk by sodium silicate pad-batch technique-Reaction mechanism Authors: Chavan, R B; Nalankilli, G Abstract: An attempt has been. made to analyze the reaction mechanism of Remazol Golden Yellow G under sodium silicate pad-batch conditions. The involvement of amino and tyrosine hydroxyl groups has been investigated after suitably modifying the silk and then estimating the amount of dye covalently bound with the modified silk fabric. It has been observed that both amino and tyrosine hydroxyl groups are involved in the reaction with the dye under sodium silicate pad-batch conditions. Page(s): 197-201