NOPR Collection:

Syntheses and dyeing characteristics of arylene bisazo 3-aminophenols and their polycondensates with formaldehyde

2016-07-20T05:31:36Z

Title: Syntheses and dyeing characteristics of arylene bisazo 3-aminophenols and their polycondensates with formaldehyde Authors: Patel, H S; Prajapati, M D; Shah, S N Abstract: Five arylene bisazo 3-aminophenols (IVa-e) and their corresponding polycondensates with formaldehyde (Va-e) were prepared and their dyeing performance on nylon and polyester was assessed. The compounds IVa-e and Va-e gave yellow, orange, red and brown shades with moderate to good light and wash fastness on nylon and polyester. The polymerization of IVa-e with formaldehyde on dyed nylon and polyester was also carried out and the dyeing properties of polymerized compounds compared with those of the polymeric compounds Va-e. Page(s): 112-114

Syntheses of 3-aryl-5-[2'-(α-pyridophthalonyl)]rhodanines and their dyeing performance on acetate and/or other fibres

2016-07-20T05:29:29Z

Title: Syntheses of 3-aryl-5-[2'-(α-pyridophthalonyl)]rhodanines and their dyeing performance on acetate and/or other fibres Authors: Fadda, A A; Aly, M M; Etman, H A; Fouda, A Abstract: 3-Aryl-5-[2'-(α-pyridophthalonyl)]rhodanines (IVa-e) were prepared by the treatment of 2-(2'-pyridyl N-oxide)indan-1,3-dione (II) with different arylrhodanines (IIIa-e) at 90°C in presence of acetic anhydride and their dyeing performance on polyester, polyacrylic and wool fibres was assessed. The effect of nature and orientation of substituents on the colour of these compounds was also studied. All the compounds showed good affinity towards wool fibres and have no affinity towards polyester and poly acrylic fibres. Page(s): 108-111

Ambient temperature bleaching of jute fibre using hydrogen peroxide

2016-07-20T05:27:55Z

Title: Ambient temperature bleaching of jute fibre using hydrogen peroxide Authors: Pandey, S N; Chattopadhyay, S N; Basu, G Abstract: The possibility of bleaching jute fibre at ambient temperature has been explored using sodium persulphate as peroxygen booster. Different combinations of the concentrations of hydrogen peroxide, sodium hydroxide, sodium silicate and sodium persulphate were used by utilizing the technique of central composite rotatable plan (CCRP). Analysis of regression coefficients and contour diagrams revealed that the whiteness increases with the increase in concentration of hydrogen peroxide up to a certain limit and then decreases. Individual effect of sodium silicate and sodium persulphate on whiteness is marginal but their interaction with sodium hydroxide has considerable positive effect The process needs minimum concentration of sodium hydroxide as its individual effect on whiteness is negative. The overall effect of the variables on bundle strength is not much significant A recipe using 90 gpl of hydrogen peroxide, 25 gpl of sodium hydroxide, 20 gpl of sodium silicate and 7.5 gpl of sodium persulphate is suggested to obtain an acceptable level of whiteness without affecting the bundle strength of the fibre. Page(s): 102-107

Utilization of carboxymethyl guaran derivatives in printing cotton fabrics with reactive dyes

2016-07-20T05:25:30Z

Title: Utilization of carboxymethyl guaran derivatives in printing cotton fabrics with reactive dyes Authors: Ragheb, A A; Kamel, M; El-Thalouth, I Abd; Nassar, S H Abstract: The suitability of carboxymethyl guaran derivatives as thickeners in printing of cotton fabrics with reactive dyes has been studied. It is observed that the colour strength of the printed fabrics depends upon the nature of the thickener used, time allowed before printing, means of colour fixation and the nature of the reactive dye used. Cotton fabrics printed using carboxymethyl guaran of DS 1.27 or more have soft handle and exhibit overall fastness properties nearly identical to those of the fabrics printed using sodium alginate. Cotton fabrics printed using Carboxymethyl guaran of low DS (0.77) acquire higher K/S but their handle is harsh. The stability of the printing pastes on storing has also been investigated. Page(s): 97-101