During dyeing reactive dye react with water instead of cellulose which is known as hydrolysis. The hydrolysis of reactive dye in exhaust dyeing is about 20-40%.
Degree of hydrolysis depends on reactivity of the reactive group in the dye. Independently on the special application conditions recommended for each class of reactive dyes, dyeing temperature and time as well as amount of alkali added should be as low as possible to reduce (not to prevent) the danger of hydrolysing the reactive groups. Furthermore the contact time of dye and alkali (necessary for activation) in the dyeing bath should be kept as short as possible.
Thank you Mam. Generally the pH of the reactive dye bath is about 10-11 and fixation time is maintained 45-60 minutes for exhaust dyeing. Could you please provide me any chemical mechanism or advanced research paper regarding the reduction hydrolysis of reactive dye?
Please, find enclosed the attached papers. In addition; I would like to recommend e.g. Chapter 8 in "Colour Chemistry", Ed. R. Christie, The Royal Society of Chemistry, Cambridge, UK; ISBN 978-1-84973-328-1.
However, all the papers or the book will give you some indications on hydrolysis and the different chemistry behind the different reactive groups, but not a complete guide for reduction of hydrolysis.
Hope that the informations are of help.
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