NOPR Collection:

Syntheses and dyeing properties of 1, 4-bis{N-[6-(2-arylazo-l-hydroxy-3- sodium sulphonatonaphth-6-ylamino)-2- chloro-s- triazin-6-yl]} phenylenediamines

2016-07-20T05:50:14Z

Title: Syntheses and dyeing properties of 1, 4-bis{N-[6-(2-arylazo-l-hydroxy-3- sodium sulphonatonaphth-6-ylamino)-2- chloro-s- triazin-6-yl]} phenylenediamines Authors: Vashi, H J; Desai, K R Abstract: 6-(2, 4-dichloro-s-triazin-6-ylamino)-l-hydroxynaphthalene- 3-sulphonic acid (III), obtained by the treatment of cyanuric chloride (II) with 6-amino-I-hydroxynaphthalene- 3-sulphonic acid (I), was coupled separately In alkaline medium with twelve different diazotized amino compounds (IVa-I) containing sulphonic acid group(s) to obtain 2-arylazo-6-(2, 4-dichloro-s-triazin-6-ylamino)-1-hydroxynaphthalene-3-sulphonic acid sodium sa.lts (Va-I). Compounds (Va-I) were separately treated With p-phenylenediamine (VI) to give 1, 4-bis{N-[6-(2-arylazo-1-hydroxy-3-sodium sulphonatonaphth-6-yiamino)- 2-chloro-s-triazin-6-yl]} phenylenediamines (VIIa-I). The compounds VIIa-I when applied on silk, wool and viscose rayon fabrics gave generally brown and violet shades with good levelness, brightness and depth on these fabrics. Further, all the compounds showed high degree of fixation and high fastness levels. Page(s): 218-221

Influence of process parameters on flexural rigidity and elastic recovery of mjs yarns

2016-07-20T05:51:31Z

Title: Influence of process parameters on flexural rigidity and elastic recovery of mjs yarns Authors: Tyagi, G K; Kaushik, R C D; Salhotra, K R Abstract: Fibre linear density plays a key role in determining the flexural rigidity and elastic recovery of mjs yarns. The feed ratio, main draft, nozzle pressure and production speed have significant influence on flexural rigidity. The variation in either second nozzle pressure or production speed has little effect on elastic recovery. The elastic recovery, however, increases with the increase in feed ratio, main draft and first nozzle pressure. Page(s): 214-217

Fibre orientation and utilization in polyester open-end friction-spun yarns

2016-07-20T05:50:07Z

Title: Fibre orientation and utilization in polyester open-end friction-spun yarns Authors: Ibrahim, A R B Abstract: Six polyester yarn packages· were spun under different spinning conditions of suction and pressure using a laboratory open-end friction-spinning machine to observe the effect of back suction on fibre orientation and utilization in polyester open-end friction-spun yarns. An optical method based on tracer fibre technique was used to study the fibre orientation and utilization in the structure of the yarns, and a Textechno Statimat M Test Machine (a computerised tensile strength tester) was used to determine the tensile strength characteristics. It is observed that fibre orientation in the yarns is poor and fibre utilization too low, but backsuction improves the fibre orientation and utilization in the spinning system. Backsuction increases the fibre extent, yarn tenacity, elongation, work of rupture and reduces the yarn diameter. The changes in fibre extent for most of the yarn packages are statistically significant at 99% level and the yarn tenacity too low for commercial utilization. Page(s): 211-213

Dyeing of polypropylene with some azo disperse dyes of basic character via chlorination route

2016-07-20T05:48:52Z

Title: Dyeing of polypropylene with some azo disperse dyes of basic character via chlorination route Authors: Samanta, A K; Sharma, D N Abstract: Polypropylene fabric, after chlorination by sodium hypochlorite under an optimized condition, was dyed separately with twelve azo disperse dyes of basic character in both alkaline and acidic medium. The higher affinity of these dyes to chlorinated polypropylene than to unmodified polypropylene has been observed in both acidic and alkaline medium with a few exceptions. The possible mechanism of higher affinity of such dyes to chlorinated polypropylene is shown and explained. The influence of dye structure and substituent groups on dye uptake and fastness properties is discussed on the basis of inductive effect, electrostatic interactions, steric cause, etc. It is observed that these dyes with electron donating groups as substituents when applied in acid medium give higher dye uptake and improved fastness properties with a few exceptions for other structural interactions including steric cause. Page(s): 206-210