NOPR Collection:

Synthesis and dyeing performance of monoazo disperse dyes derived from 3-amino-5-nitro-2,1-benzisothiazole

2016-07-20T06:25:21Z

Title: Synthesis and dyeing performance of monoazo disperse dyes derived from 3-amino-5-nitro-2,1-benzisothiazole Authors: Shah, K H; Patel, R G; Patel, V S Abstract: Nineteen azo disperse dyes (IVa-s) based on 3-amino-5-nitro-2,1-banzisothiazole were prepared using various acetoacetanilides (IIIa-h) and naphthols (IIIi-s) as coupling components and their dyeing performance on nylon, polyester and cellulose triacetate fibers was assessed. The percentage dye bath exhaustion on different fibres was moderate to good. The dyed fibres showed fair to good fastness to light and very good to excellent fastness to washing, rubbing, perspiration and sublimation. Page(s): 189-193

Synthesis of azo disperse dyes with 2-amino-5-phenyl-1,3,4-thiadiazole moiety for dyeing polyester fibre

2016-07-20T06:24:33Z

Title: Synthesis of azo disperse dyes with 2-amino-5-phenyl-1,3,4-thiadiazole moiety for dyeing polyester fibre Authors: Desai, T R; Desai, K R Abstract: 2-Amino-5-phenyl-1,3,4-thiadiazole(II), prepared by condensing benzoic acid (I) and thiosemicarbazide, was treated with salicylaldehyde to give 2-(6'-hydroxy Schiff’s base-1'-yl)-5-phenyl-1,3,4-thiadiazole (III). Various aryl arnines (IVa-t) were diazotised and coupled with the compound III to give 2-(6'-hydroxy Schiff’s base-5'-arylazo-1'-yl)-5-phenyl-1,3,4-thiadiazoles (Va-t). All the compounds, when applied on polyester fibre as 2% shade, showed moderate to good light fastness and good to excellent fastness to washing, perspiration, rubbing and sublimation. Page(s): 185-188

Green technology in textile processing: Part I-Bleaching of cotton goods

2016-07-20T06:23:33Z

Title: Green technology in textile processing: Part I-Bleaching of cotton goods Authors: Deo, H T; Wasif, A I Abstract: A new formulation is suggested which gives bleaching results comparable to those obtained conventional process along with noticeable savings in steam, electricity and water consumption. The process can be considered eco-friendly as it avoids the use of banned chemicals, requires low concentrations of chemicals and reduces waste concentration in waste water. Page(s): 177-184

Effect of solvent treatment on mechanical, structural and dyeing properties of regenerated cellulosic yarns

2016-07-20T06:22:39Z

Title: Effect of solvent treatment on mechanical, structural and dyeing properties of regenerated cellulosic yarns Authors: Rajendran, S; Ramasamy, S S; Mishra, S P Abstract: The mechanical, structural and dyeing properties of conventional viscose and solvent-spun lyocell yarns have been studied in untreated condition as well as after treatment with trichloroacetic acidmethylene chloride (TCAMC) reagent. It is observed that the lyocell yarn has higher tensile strength and abrasion resistance than the conventional viscose yarn. The tensile strength of viscose and lyocell yarns increases on treatment with 5% (w/v) TCAMC for 2 min. The TCAMC treatment has no effect on the elongation of viscose yarn but the elongation of lyocell yarn shows a drop. There is no change in the abrasion resistance of both the yarns due to the treatment. TCAMC modifies the structure of both the regenerated cellulosic yarns. Decrystallisation and disorientation take place on treatment. The crystallite size of lyocell is smaller than that of viscose. The treatment decreases the crystallite size. The dyeability study shows that the dye uptake of lyocell yarn is higher than that of viscose yarn. The TCAMC treatment improves the dye uptake of viscose yarn. Wash and light fastness of both the yarns are not altered due to treatment. Page(s): 170-176