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Physico-chemical study of dyed wool: Part I-Bougainvillaea as wool colourant with mixed mordant

Sat, 01 Dec 2001 00:00:00 GMT

Title: Physico-chemical study of dyed wool: Part I-Bougainvillaea as wool colourant with mixed mordant Authors: Mathur, J P; Bhandari, C S Abstract: The extract of red petaloid bracts of bougainvillaea has been used as wool colourant with mixed mordants and the physico-chemical properties of the dyed samples studied. The petaloid bracts when treated with water at 97.5°C for nearly 20 min yield 7.43% of bougainvillaea (BV) colourant. The optimum conditions for dyeing of wool have been determined as pH 4.5, BV concentration 0.06 g per gram of wool, temperature 97.5°C, and time 45 min. It is observed that the use of lanthanum (III) as first mordant and chromium (VI) as second mordant reduces the quantity of Cr (VI) in the spent dye bath and causes less damage to the wool fibre in comparison to the dyed yarn mordanted with Cr (VI) alone. This binary mixed-mordant dyeing also reduces the environmental pollution caused due to the discharge of toxic chromium ion in the effluent. Page(s): 432-437

Improving the dyeability of natural colorants on cotton by cationization

Sat, 01 Dec 2001 00:00:00 GMT

Title: Improving the dyeability of natural colorants on cotton by cationization Authors: Eom, Seong-il; Shin, Dong-yoon; Yoon, Kee-jong Abstract: Cotton fabric was cationized with several cationizing reagents before dyeing with natural colorants (Redwood, Gromwell, Cochineal, Goldthread and Amur cork tree) for improving its dyeability. The K/S value of cationized cotton fabric dyed with Redwood and Cochineal was higher than that of untreated one. In case of Gromwell, though the K/S value of the cationized fabric was higher than that of untreated one, the fabric showed poor levelness. Cationization of cotton had no effect on the dyeability of Goldthread and Amur cork tree. It is observed that when the concentration of NaOH exceeds beyond a certain level, NaOH hydrolyzes the cationizing agent and the K/S values of dyed materials decrease. The optimum concentrations of NaOH in cationization have been determined for dyeings with different natural colorants. Page(s): 425-431

A novel technique of cotton dyeing with reactive dyes at neutral pH

Sat, 01 Dec 2001 00:00:00 GMT

Title: A novel technique of cotton dyeing with reactive dyes at neutral pH Authors: Bhattacharya, S D; Agarwal, B J Abstract: Cotton fabric was treated with optimum concentrations of polyacryl amide and epichlorohydrin, dried, cured and then studied for morphological changes occurred due to the treatment. The modified fabric was then dyed with selected commercial reactive dyes under neutral pH in the absence of electrolyte by different dyeing sequences. The dyeability and fastness properties of the modified and dyed samples were assessed and then compared with those of the conventionally dyed sample. It was observed that the simultaneous polyacrylamide-epichlorohydrin treatment and dyeing enhances the dyeabilily of cotton at neutral pH with a series of commercial reactive dyes. The probable mechanism for dye fixation on polymer treated fabric has been proposed. Page(s): 418-424

Physico-mechanical properties of fabrics prepared from blends of sulphonated jute fibre with natural and synthetic fibres

Sat, 01 Dec 2001 00:00:00 GMT

Title: Physico-mechanical properties of fabrics prepared from blends of sulphonated jute fibre with natural and synthetic fibres Authors: Ali, Mohammed; Mian, A Jabber; Islam, M Nurul; Awual, Md Rabiul; Fazal-E-Karim, Syed; Chowdhury, A M Sarwaruddin Abstract: The plain woven fabrics have been prepared from the blends of sulphonated jute fibre with natural and synthetic fibres, and their geometrical, physico-mechanical and drapping properties studied. It is observed that the blended fibre fabrics show improved textile properties, almost similar to those of the cotton fabrics. Page(s): 414-417