Reactive dyes are found in powder, liquid and print paste from. He successfully converted the process he had developed in laboratory to a large-scale production, and demonstrated the application of the dye on silk. Computer-aided study of the interaction between proteins and dye chromogens has suggested improved dye structures for chromatographic application. >> (�� �hk�Ek��`3���IAR�r������'��D�\ In a second stage the dye penetrates into the fabric and is then fixed. This reaction of dye with water is known as hydrolysis of reactive dye. Some operations must be carried out for both exhaust and pad dyeing: Dissolve or disperse the dye in water and filter.

The same thing occurs with dye-but also with the water that the dye is dissolved in. and Stead, C.V., Design and Application of Biomimetic Dyes in Biotechnology. Hydrolysis of activated vinyl compound containing group: D-F-CH2-CH2-OSO3H + H-OH ------------- D-F-CH2-CH2- OH + H2SO4, NaOH -----------------3-6 g/L       (Temp100-105 x 60-30min), Wetting agent --------------1g/L (RoomTemp x 10min). (#g��q-q �WP��N���K���x�����v ���u�*� @� �Ǽ�\��5���!��,G��t G�̄r�q:ɑn��>o ��xߕ�� c,���8����$d5����!�� T��~7��M�����;� e��

The cellulose molecules in cotton material can dye well at high temperature (80°c), if the dye is already located in the fiber, adjacent to the cellulose molecules before it react that temperature. Cotton is soaked in a colourless solution of the reduced form.

This covalent is formed between the dye molecules and the OH hydroxyl group of cellulosic fibers on between the dye molecules and the terminal -NH2 group of polyamide. Cellulose materials is not gives good results. There are varieties of testing procedure, because-. At the same time, the liquor flow in contact with the material is spread homogeneously and allows a good distribution of the dye in all the areas of the textile surface; this enhances the dye consistency with the same operating times. %���� reactive dye is more suitable and profitable for cellulose materials.

Materials should be free from bleaching agent like hypochlorites, or reducing agents such as Sodium Hydrosulphite. Fixation occurs during the storage of the batched fabric at ambient temperature. Lowe, C.R., Burton, S.J., Pearson, J., Clonis, Y.D. this is the reason, mostly in textile industry reactive dyeing is used for cellulose materials.

here, in case of stripping of reactive dyeing. recipe of cold brand reactive dyeing methods, start

Alkali is also very important role in reactive dyeing. At the end of the process the material is washed. During this stage, by the effect of the dye-fibre affinity, the dye is adsorbed at the surface of the fibre, thus forming chemical bonds with it. If a fabric is dyed for sixty minute with reactive dyes it will show all required properties, i.e. 65 0 obj << /Type /Font /Subtype /TrueType /BaseFont /CourierNewPS-ItalicMT /FirstChar 0 /LastChar 255 /Encoding /WinAnsiEncoding /FontDescriptor 66 0 R /Widths [ 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 ] >> endobj 66 0 obj << /Type /FontDescriptor /FontName /CourierNewPS-ItalicMT /FontBBox [ -250 -250 800 1000 ] /Flags 99 /CapHeight 666 /Ascent 833 /Descent 300 /StemV 109 /ItalicAngle 0 /XHeight 466 /AvgWidth 600 /MaxWidth 868 >> endobj 67 0 obj << /Type /FontDescriptor /FontName /CourierNewPS-BoldMT /FontBBox [ -250 -250 702 1000 ] /Flags 35 /CapHeight 666 /Ascent 833 /Descent 300 /StemV 191 /ItalicAngle 0 /XHeight 466 /AvgWidth 600 /MaxWidth 748 >> endobj 68 0 obj << /Type /Font /Subtype /TrueType /BaseFont /CourierNewPS-BoldMT /FirstChar 0 /LastChar 255 /Encoding /WinAnsiEncoding /FontDescriptor 67 0 R /Widths [ 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 ] >> endobj 69 0 obj As medium alkali sods ash(Na2co3) is used to create pH 11-12. when the dye is of medium reactivi. Since exhausted dyes are already on fibre, it is more likely that exhausted dye reacts with fibre in preference to water. Since reactive dyes have low affinity for cellulose, exhausting dye bath can increase fixation, by adding common salt or Glauber’s salt prior to fixation. Reactive dyes are anionic dyes, which are used for dyeing, 10. Reactive dye is a class of dye that makes a covalent bond with the fiber and becomes an integral part of the fiber. In this case dye is not as reactive as cold brand dyes & hence higher temperatures are required for achieving adequate fixation.

��� 7�� 7ғ�1� r�^� n�iAP9���c? Add pre-dissolved dye for 5 minutes and continue for 10 minutes, Add rest salt according to the following table and run for 15 minutes. As liquor ratio is decreased, effectiveness of increasing salt addition also decreases. Then salt is added in dye bath and thus the fabric kept there for 10-20 minutes. Reactive dyes give brighter shads and have moderate rubbing fastness. Helo, reders welcome to my website”textilesgreen.in” today I m going to explain about reactive dye, reactive dyeing process, properties, classification and types. Over 10 million scientific documents at your fingertips. /Filter /FlateDecode