Synthesis of azo disperse dyes with imidazolone moiety and their application on nylon and polyester fibres

Twenty-two azo disperse dyes (VIa-k and VIIa-k) were prepared by coupling diazotized 1-(4-aminophenyl)-2-phenyl-4-(substituted Benzylidene)-5-imidazolones (III and IV) with various naphthol derivates (Va-k) and their dyeing performance on nylon and polyester fibres has been assessed. All the imidazolone dyes showed fair to good fastness t..

Studies in the right-first-time dyeing of cellulose with reactive dyes: role of material-to-liquor ratio

The effect of variation in the material-to-liquor ratio on 37 commercially available reactive dyes (25 Procion and 12 Remazol) has been studied. It is observed that the extent of variation in the K/S value due to the variation in material-to-liquor ratio is different for different dyes. Based on the effect of variation in material-to-liqu..

Syntheses of bisazo reactive dyes based on 6,6'-methylene-bis-anthranilic acid and their application on various fibres

Ten bisazo reactive dyes (VIIa-j) have been prepared by coupling diazotised 6,6'-methylene-bis-anthranilic acid (III) with various anilino cyanurated coupling components, viz. anilino cyanurated H-acid, Schaffer acid, G-acid, J-acid, Tobias acid, N-phenyl J-acid, N-methyl J-acid, Gamma acid and R-acid (VIa-j), and their dyeing performance..

Reduction in the chemicals required for sulphur dyeing

Sulphur dyes produce excellent dyeing swith good fastness properties. They are water-insoluble high-molecular compounds resulting from specific organic compounds merging with sulphur. A solution is formed from the dyes by reduction with sodium sulphide or sodium dithionite and caustic soda lye. This watersoluble form has an affinity for f..

Probe into the determination of dye structure by X-ray photoelectron spectroscopy

In this paper, X-ray photoelectron spectroscopy is employed to determine dye structure of acid brown BN, probed to new method of simplifying and speeding the analysis of dye structure.

Extension of liposome use into wool dyeing with metal complex 1:2 dyes (Spanish) (Estension de la aplicacion de liposomas en la tintura de la lana a los colorantes de complejo metalico 1:2)

Studies on the use of multilamellar lipid vesicles (MLV) of defined size (400nm) containing increasing amounts of cholesterol (CH) as carriers of a 1:2 metal complex dye to untreated wool fibers are described. We investigated liposomes made from egg phosphatidylcholine (PC) containing the C.I. Acid Yellow 129 dye (weakly polar 1:2 metal c..

Rope drive in piece dyeing machines

Three main types of drive systems are distinguished in piece dyeing machines: winch drive only (scarcely found today), winch drive with 'jet' assistance, and 'jet' drive only (executed only as air jet). All these systems have their justification and their advantages and disadvantages in terms of textile and process technology. In recent m..

Comparison of the thermal fixation of reactive dyes on cotton using infrared radiation or hot air

A 100％ cotton fabric was impregnated with an alkaline solution of a reactive dye and reaction with the cellulose acheived by heating using electric infrared emitters or hot air. The conditions gave temporal variations of fabric humudity and temperature that were similar for each heating method. Fixation yields and color strengths for the..

Studies on the dyeing behaviour of amines pretreated wool with reactive dyes

Wool can be dyed with acid, basic, direct and reactive dyes in neutral or slightly acidic conditions. Now a days efforts are made to minimise the consumption of energy during various textile processing since the cost of energy is escalating day by day. One such attempt is bringing down the dyeing temperature. The temperature can be brough..

Experiences in dyeing of fiber blends of lyocell and wool

The dyeing of lyocell and lyocell in blend with wool is described. Lyocell is dyed with direct dyes in short times and at low temperatures (RT, 60, 80℃) with high levelness, in deep shades and with sufficient wet fastness properties. However, a complete penetration of direct dyes across the whole fiber cross section of lyocell fibers can..