Advancement of exhaustion, migration, adsorption and fixation of dyestuff to the cellulose materials

A method of dyeing a cellulosic material with reactive dyes using a salt mixture as an electrolyte and alkali agent I and II, the method comprising the steps of:

• i. exhausting a pre-treated cellulose material with the reactive dyes using the salt
• (weight percentage of content basis) first mixture of:
• A. potassium chloride between 2% and 50%,
• B. diammonium phosphate between 0.5% and 18%,
• C. urea between 0.9% and 60%,
• D. sodium nitrate between 2.00% and 30%,
• E. calcium chloride between 0.02% and 7%,
• F. manganese sulphate between 0.10% and 5%,
• G. ETDA sodium between 0.002% and 7% and
• H. ferrous sulphate between 0.10% and 10%,
• wherein the first mixture is added to water in an amount ranging between 0.2 and 5 GPL (gram per litre), followed by adding sodium chloride or sodium sulphate in an amount ranging from 0.5 to 5 gram per litre in a reactive dyeing to obtain an exhausted cellulose material;
• ii. fixing the exhausted cellulose material by using the alkali agent I comprising (weight percentage of content basis) a second mixture of:
• A. sodium bicarbonate between 2% and 40%,
• B. potassium bicarbonate between 0.5% and 15%,
• C. sodium carbonate between 10% and 90%,
• D. potassium carbonate between 2% and 70%,
• E. sodium acetate between 2% and 30%,
• F. ferrous sulphate between 0.1% and 5%,
• and water, wherein the second mixture is added to water in an amount ranging between 0.5 and 15 GPL (gram per litre);
• or by using soda ash (sodium carbonate) in an amount between 1 GPL and 33 GPL (gram per liter);
• iii. treating the cellulosic material of step (ii) to further, fixation of the dyestuff using the alkali agent II comprising (weight percentage of content basis) a third mixture of:
• A. potassium hydroxide between 5% and 70%,
• B. calcium hydroxide between 1% and 50%,
• C. trisodium phosphate between 2% and 80%,
• D. sodium hydroxide between 0.1% and 20%,
• and water, wherein the third mixture is added to water in an amount ranging between 0.2 and 10 GPL (gram per litre) to obtain a stained cellulosic material;
• (iv) subjecting the stained cellulosic material to neutralization, soaping, washing with water and drying to obtain a dried dyed cellulosic material,
• wherein:
• the exhausting step (i) is carried out by maintaining pH 3 and above at a temperature in a range of 25-80° C. and an (MLR) material to liquor ratio is in a range of 1:20 to 1:3 for a time period of between 15 minutes and 90 minutes;
• the fixing step (ii) is carried out by maintaining pH 9.5 and above at a temperature between 25° C. and 80° C. for a time period of between 10 minutes and 90 minutes;
• and
• the fixing step (iii) is carried out by maintaining pH between 10 and above at a temperature between 25° C. and 80° C. for a time period of between 40 minutes and 150 minutes.