Due to its process requiring to wash the fabric to remove excess dyes and treatment, often printers will use industrial size washing machines. For fixation purpose, Alkali controllable dyes need temperature between 40 to 60℃ whereas Salt controllable dyes require temperature above 80℃. Reactive dye consists of chromophore and reactive group along with solubilizing and bridging group. The various application methods, fastness properties and advantages of these dyes have been described. It is ironic that the fixation of non hydrolysable reactive dyes should be no better than that of regular reactive dyes due to the same basic problem in the former case relating to the fixation agent and in the latter to the dye itself. Luxury Naturals Vs Thrifty Synthetics, What is Lace Fabric? Covid19 has given opportunity to live sustainable Life!!! Procian T dyes do not hydrolyze and at the end of the dyeing process retain their capacity for fixation. But if the solution of the dye is kept for long time, its concentration drops. The reactive dye is printed onto the fabric using an inkjet. Reactive dye + fiber = Reactive dye-fiber (by covalent bond) Components of Reactive dye. The ease and the simplicity of the dyeing method for one bath dyeing of polyster/cellulose blends has made possible the dyeing of various blended textiles like nylon/cellulose, wool/cellulose, acrylic/cellulose etc. Reactive printing produces high quality, long lasting prints. Where the reactive chloro groups react with water, in dye bath at the end of dyeing cross-linking of cellulose may take place. Here’s the factors: Chemically cellulose behaves as a polyhydric alcohol and commercial reactive dyes react with it only under alkaline condition. 2. No of reactive group present in the dye structure. After a long silence in this area, reactive cationic dyes have been evaluated on wool and in the context of salt free dyeing of cotton cellulose. Today, we’ll be putting this highly coveted printing process under the microscope. Consequently, it can be washed many times and resist fading. 5.Daystar has introduced Remazol Carbon RGB, a new high strength reactive black dye, said to be economical and to exhibit excellent build up, thereby reducing the amounts needed to achieve deep shades that cannot be achieved with conventional process. Influencing factors in case of Reactive dye . 4.Procilence N dyes introduced by ICI (now Zeneca) are the combinations of Dispersol PC disperse dyes and Procion T reactive dyes for the one-stage printing of polyester/cellulosic blends. Reference- 1. As a result, alkaline pH should be maintained for dyeing and fixation purpose. Reactive dyed treads can’t be post bleached. The different structural components of a reactive dye are: Let’s think about the general structure of reactive dye-, Where, D = Dye chromophore (Azo, Anthaquinone, Metal complex, Phthalocyanine group), B = Bridging group (Amino, Oxide, Sulphur, Ethyl, Methyl group). As well as importance has also been given to save the energy and water level, which is used for Reactive dyeing. However when the total cost are taken into account, like reduction in fixed expenses, utilities, labour cost etc, and particularly dyeing medium and pale shades where the amount of the dye used is less, this may result in overall cost saving. The long-standing criticism of reactive printing is its water waste. The fabric is then washed to remove the excess dye and pre-treatment, resulting in a vibrant, long-lasting print. These dyes are fixed to the polyester/Cellulose blends under approximately neutral conditions. Due to high import duty, it is virtually impossible to import these dyes but a few of the dyestuff manufacturers like Jaysynth, Atlas and Chemiequip have develop and produced in India this type of bifunctional reactive dyes having vinyl sulphone and monoclorotrizine groups. We also dispose of our ink and water waste responsibly and have our process checked to ensure its eco-friendly and free of harm. The amount of alkali, temperature during dyeing, pH as well as dyeing time should be kept minimum or low as much as possible. The dyestuff manufacturers in the last few years are preoccupied in fulfilling their commitments and hence they pay less attention to the Nome market to provide technical services and trials normally required for introducing such new dyes. The variation in chromophore, is quite important factor in case of reactive dye. In conclusion, reactive printing is the perfect choice when printing natural and protein fibres. It has a high colour yield. Reactive dyes are not fast to chlorine bleach unlike Vat dyes. While Sum fix Supra bifunctional reactive dyes are mainly for exhaust dyeing, the Cibacron C dyes are designed mainly for pad-batch and continuous dyeing. How is it different from other printing methods and what are the pros and cons? So improvements in the reactive dyeing research are going on very fastly for maintaining ecological and environmental solutions. They are highly used for their varying shade range, fastness, brilliancy. pH – In case of reactive dye pH is an important factor as dyeing is carried in alkaline pH. Remazol Carbon RGB is suitable for exhaust and pad-dry pad- steam dyeing of cellulosic fiber blends. Attempts to introduce it directly into a particular position of a chromogen have been unsuccessful, owing to unsatisfactory selectivity and unavoidable side reactions and decompositions. The designs printed onto fabrics using reactive dye are permanently infused into the material. This dye comes in a wide variety of colours and is extremely strong. with these reactive dyes along with other dyes in one bath. A chromogen which is responsible for the color, Solubilising group that is responsible for the solubility of the dye, Reactive group that forms covalent bond with fiber polymer, Bridging group between the reactive group and the chromophoric system, Chromophore is the reason of giving various shade range, Chromophore affects the reactivity of dye. Studies on the stability of the dye fiber bond of Procian T dyes demonstrated that this class of reactive dyes have dye fiber stabilities in the range as those of other major classes of reactive dyes. Excellent build-up in high or low liquor ratios. Any fading caused by exposure to light and perspiration is on-tone. Due to this property, they display an excellent practical performance when the temperature in the dye bath is not completely uniform, particularly in winch dyeing machines. However many color combinations shades are also economical when produced from these dyes. 3. How To Make A Repeating Pattern: An Easy Do-It-With-Me-Guide, What is Egyptian Cotton? It also means that prints stay vibrant and are safe to wash. Reactive dyes are printed using an inkjet onto a pre-treated fabric. Here’s the reasons: For chemical synthesis purpose, bridging group is mostly required. The earliest commercial dye based on this approach is Remazol Black B by Hoechst (CI Reactive Black 5). No matter how complex and colourful your design is, reactive printing is the ideal option to print natural fabrics. A high-pressure steamer is used at a very hot temperature on the printed fabric to lock colours into the fibres. It will be worthwhile to point out that ICI, as early as in 1977, introduced reactive blue 187 (Procian Brilliant Blue HEG) which contained Bis 3 carboxy-pyridinium group. Reactive dyes are most commonly used in dyeing of cellulose like cotton or flax, but also wool is dyeable with reactive dyes. Several environmental problems are associated with reactive dyeing such as higher alkalinity, colored effluent and large amount of electrolytes. Surprisingly it has been found that one of the manufacturers in India has come into market with a wide range of these dyes but many of them have light fastness about 2 to3, and some dyes fade almost completely in sunlight when the goods dyed are in wet conditions. DyStar says the new product also has good wash-off properties and meets high wet fastness and chlorine fastness requirements. You can use this process on most natural textiles, specifically natural or protein fibres such as silk, cotton, wool, cashmere, linen, hemp and so on. This works best for natural cotton fibres. 15th December 20172nd December 2019 by luca, Your email address will not be published. Dyes based on s-triazine do not have good fastness properties in acedic media and due to their high substantivity they have poor wash off properties. These dyeing properties of reactive cationic dyes on blended fabrics. Reactive dye + fiber = Reactive dye-fiber (by covalent bond). Is reactive printing the right method for your project?
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