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Reactive dyeing method - MCT

Methods of Dyeing cotton with Various Reactive dye brands: 

Application on cotton fabric by various dyes- 

Among these five, below is the explanation of the second method.

Explanations -


(2) Hot brand reactive dyes (HE dyes)

Application -
The application of H brand reactive dyes to cotton material involves the identical steps as those for M brand dyeing. 

(i) Exhaustion step- To transfer the maximum amount of the dye on the fibre as possible.
Exhausting agents -
(B) Glauber's salt(Anhydrous Sodium sulphate)
(ii) Fixation step -
The dye reacts with the fibre forming a chemical (covalent) bond within the presence of an Alkaline chemical compound, like washing soda or a detergent builder or a mix of sodium carbonate and sodium hydroxide.
(iii) After treatment of the dyed material(Soaping and washing):

(A) Common salt or


Dyeing procedure -

(a) Preparation of products for dyeing -
The procedure is the same as for cold brand reactive dyes.
(b) Preparation of dye solution Paste the dye powder with cold water and dissolve it by adding water at a temperature of 80°C.

(c) Dyeing cycle ( H brands Dyes) -
The dyeing cycle for dyeing one lot of textile materials with H brand reactive dye is shown in the dig. 

Dyeing cycle for reactive H brand dyes
Dyeing cycle for reactive H brand dyes

(1) Set the dye bath at 50°C
(2) make sure that its pH is simply below 7
(3) Adjust pH with ethanoic acid if necessary
(4) Enter the fabric and run it in the bath for five minutes
(5) Add pre-dissolved dyes and continue dyeing for 10 minutes
(6) Add the salt in three portions (10%,30% and 60%) during the amount of raising the temperature to 80 to 95 °C in a half-hour
(7) Dye for 20 minutes at 85°C after the last salt addition (8)Add the alkali; if salt alone is employed, it should be added over 10 minutes. If a mixture of sodium carbonate and sodium hydroxide is employed the premixture should be added over a quarter-hour. 
(9) Dye for an additional 30 to an hour at 85°C depending upon the depth of shade
(10) Drop the bathtub and take 

Depth of shade (%owf)

Salt (gpl)

Soda ash (gpl)

Up to 0.5%

30

10

0.5 to 1.0%

45

15

1.01 to 2.0%

60

15

2.01 to 4.0%

70

20

Above 4.0 %

90

20


(iv) Washing off and Soaping -
For maximum fastness, wash off efficiently after dyeing. The wash-off cycle is given below- 

Time (minutes)

Operation

10 minutes

Cold wash

10 minutes

Cold wash

15 to 30 minutes

Soap at a boil.For heavy shades two 15 minutes.
Soaps are preferred. Neutral soap is used for Soaping

10 minutes

Warm(50°C)wash. Cold wash until the wash liquor is clear. Drop the bath and squeeze and dry the dyed material


Questions- 
  1. Which methods are used for the reactive dyeing process?
  2. Describe the Hot brand reactive dyes (MCT) process.
  3. What is the dyeing process for MCT reactive dyes?
  4. Which sequence does the MCT Reactive dyeing process follow?

References

Ahmed, S. (2014, September 29). Reactive dyes - classification. TextileTuts. https://textiletuts.com/reactive-dyes/

Chakraborty, J. N. (2010). Waste-water problem in textile industry. In Fundamentals and Practices in Colouration of Textiles (pp. 381–408). Elsevier.

Clark, M. (2011). Handbook of textile and industrial dyeing: Principles, processes and types of dyes (Matthew Clark, Ed.). Woodhead Publishing.

No title. (n.d.). Acs.org. from https://cen.acs.org/articles/96/i29/new-textile-dyeing-methods-make.html

Patwary, E. M. Z. (2012, February 18). Reactive dyes. Textile Fashion Study; Engr. Mohammad Zillane Patwary. https://textilefashionstudy.com/reactive-dyes-definition-classification-properties-and-influencing-factors/

Sayed, A. (n.d.). Why reactive dye is so called? Blogspot.com. from https://textileapex.blogspot.com/2013/11/reactive-dye.html

What are Reactive Dyes? Types of Reactive Dyes. (n.d.). Meghmaniglobal.com. from https://www.meghmaniglobal.com/what-are-reactive-dyes-types-of-reactive-dyes/


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Writer
 - Rushikesh Patil (Textile Engineer)
(DKTE Society textile engineering college Ichalkaranji)
Email Id - rushikeshpatil23052002@gmail.com

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