Reactive dyes are found in powder, liquid, and print-paste form. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B9780128103913000060, URL: https://www.sciencedirect.com/science/article/pii/B9781845696955500167, URL: https://www.sciencedirect.com/science/article/pii/B9780081026335000087, URL: https://www.sciencedirect.com/science/article/pii/B9781845699314000209, URL: https://www.sciencedirect.com/science/article/pii/B9780857090270500138, URL: https://www.sciencedirect.com/science/article/pii/B978184569695550009X, URL: https://www.sciencedirect.com/science/article/pii/B9781845696955500040, URL: https://www.sciencedirect.com/science/article/pii/B9781845697884500066, URL: https://www.sciencedirect.com/science/article/pii/B9781855739512500123, URL: https://www.sciencedirect.com/science/article/pii/B9781782423119000045, Industrial Water Treatment Process Technology, Handbook of Textile and Industrial Dyeing, Water conservation in textile wet processing, The chemistry of reactive dyes and their application processes, In general, textile materials coloured with, Fundamentals and Practices in Colouration of Textiles, Substrate preparation for ink-jet printing, Advances in the dyeing and printing of silk. These dyestuffs containing two groups are also known as bifunctional dyestuffs although some still refer to the original combination. 4.11. At Cosmonaut’s, our dyes become an integral part of the fiber, giving you a long-lasting color holding capacity. Reactive dyeing is the most important method for the coloration of cellulosic fibres. A homogenous process of distribution is used for spreading the dye. Our reactive dyes for cotton can be easily soluble in water. They’re used on cellulosic fabrics such as cotton, linen, hemp, rayon and Tencel, and can also be used with wool. eval(ez_write_tag([[728,90],'textilestudycenter_com-leader-2','ezslot_13',602,'0','0'])); (5246), Internship Trainee at SQUARE Fashions Ltd. For example, Remazol, Livafix are medium brand dyes. A limited storage period is applicable to most of the reactive dye. To overcome this deficiency, dyestuffs containing two (or more) different reactive groups were developed. Sometimes, they also react with water, causing hydrolysis; however, their hydrolyzed form acts as an acid dye forming a salt linkage with the fiber. This method consumes only a small amount of water and energy. Rattee and Stephens at Imperial Chemical Industries popularlized the chlorotriazines as linkers between the substrate and the chromophore. The fabric is placed on the printing table of flat screen-printing machine. These are usually used to dye cellulosic fibers such as cotton, rayon, or flax, but polyamide, wool, silk, and acetate fibers can also be dyed using reactive dyes. Reactive dyes have good perspiration fastness. At Cosmonaut Chemicals, we have a wide range of color options, that helps you add a variation in your textile products. Dichloro Triazine, Diflorochloro Pyrimidine, Vinyl Sulphone. The reactive dyes can react with water molecules as well. You can use our dyes for discharge printing, resist printing, direct printing, and inkjet printing as well. Recipe :eval(ez_write_tag([[728,90],'textilestudycenter_com-large-mobile-banner-2','ezslot_12',601,'0','0'])); Preparation of thickener :eval(ez_write_tag([[468,60],'textilestudycenter_com-mobile-leaderboard-1','ezslot_16',198,'0','0'])); Printing of cotton fabric with reactive dyes has excellent build up property and maximum fixation. The bond between vinyl sulphone and cellulose is very strong and is stable to acid hydrolysis. It is now a days mostly used for dyeing and printing of cotton yarn and fabric. Some padding formulation recommendations replace the sodium carbonate in Table 12.2 with 25 g/L sodium bicarbonate. Along with lightfastness, the reactive dyes have a wash fastness as well. X = Reactive system or group, which reacts chemically with the functional group of the fibre, Lower reactive dye: here pH is maintained 12-12.5 using NaOH in bath, Medium reactive dye: pH is maintained 11-12 by Na, Higher reactive dye: pH is maintained 10-11 using NaHCO, Wash-off of the unfixed dye from material surface. Monochlorotriazine dyes are available on the market in different trade names such as Procion H (Atul), Reactofix H (Jay Synth), Amaryl X (Amar Dye Chem), etc. The dye is first attached to the ethylsulfonyl group. The hydrolyzed dye can not react with fiber, and the efficiency of the fixation is decreased. D.M. Schematic structure of reactive dye. The effect of using a reactive bond can be differentiated quite easily, as these dyes are quite distinct from any others. T = Bridging group which attaches the reactive system X to the chromogen F; Usually, –NH, –O–, –NHCO–, –OCH3–, –SO3–, etc. Reactive dyes are applied either from a solution with high pH or from neutral solutions that are later alkalized through a separate process. They are marketed in the soluble form that is ß-hydroxy ethylene sulphone derivatives D SO2 CH2 CH2OSO3 Na, where D stands for dye chromophore. Providing these covalent bonds are stable to conditions encountered in laundering, the wash-fastness properties of the colourations will be outstanding.
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