Author Topic: SALT FREE REACTIVE DYEING OF COTTON  (Read 1419 times)

Offline nawshin farzana

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SALT FREE REACTIVE DYEING OF COTTON
« on: October 27, 2011, 11:34:03 AM »
SALT FREE REACTIVE DYEING OF COTTON -a newer technique of cotton dyeing without salt usage

Reactive dyes are very popular for cellulosic garments as they are environmentally safe and having good overall fastness properties. But application of these dyes requires a very high concentration of salt. The salt released from garment dyeing increases salinity in drain water stream which has a negative impact on environmental ecology. The present work aims to eliminate the usage of salt during dyeing of cotton goods with reactive dyes.

The methodology adopted here, for the elimination of salt in cotton dyeing, was based on the principle of cationisation (to develop a positive charge) of cotton. The same was achieved by subjecting the caustic pretreated cotton fabric samples to a treatment of 1, 2 dichloroethane followed by methylamine to introduce amino groups in the cellulose structure. The treated cotton when dyed from slightly acidic bath generates positive sites due to protonation in the amino group. The reactive dyes being anionic (negatively charged) in solution get attracted to the positive charges on the fibre which eliminates the salt requirements for satisfactory dye exhaustion.

A pretreatment to cotton which could eliminate the usage of salt in its dyeing with reactive dyes is revealed.
Both garment dyeing units and fabric/yarn finishing industries would thus be helpful.


Offline Tanvir Ahmed Chowdhury

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #1 on: October 27, 2011, 11:43:22 AM »
Madam, please write more about the process
Tanvir Ahmed Chowdhury

Assistant Professor
Department of Textile Engineering
Faculty of Engineering
Daffodil International University

Offline Mostafa Zaman

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #2 on: October 27, 2011, 12:26:26 PM »
Can u pls give us some factory information where this technique is using?

Offline Sumon Mazumder

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #3 on: October 27, 2011, 12:29:39 PM »
Dear Madam, I think we can offer this kind of project work to the final year students. Also thanks you to share with us this latest development in the textile wet processing technology.


Sumon Mazumder
Lecturer,
Dept. of TE
FSIT, DIU

Offline sumon_acce

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #4 on: October 27, 2011, 12:59:31 PM »
Nice information.....this is also very valuable for our DIU students.

Offline fatima

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #5 on: October 28, 2011, 09:27:37 PM »
 :)thank you Mam,its a new concept for me.i also agree will Sumon sir.i want know about this dyeing in details so that i can do a project work on it.
Fatima Binta Satter Disha
Lecturer
Textile Engineering

Offline Suha

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #6 on: October 29, 2011, 08:01:45 AM »
Good post.
Engr. Md. Mahfuzur Rahman
Asst. Professor
Department of Textile Engineering
Daffodil International University

Offline nawshin farzana

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #7 on: October 29, 2011, 01:09:05 PM »
Thnx to all for your appreciation & valuable advice

Offline samiha sultana

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #8 on: October 30, 2011, 02:26:56 PM »
Want to know more fine points…

Offline Mostafa Zaman

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #9 on: November 05, 2011, 03:05:54 AM »
Very nice post and interesting.............

Offline texsayem

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Re: SALT FREE REACTIVE DYEING OF COTTON
« Reply #10 on: November 05, 2011, 05:01:23 PM »
Interesting... :)
Shahed Mohammad Kazi Shayemur Rahman
Lecturer,
Department of Textile Engineering
Daffodil International University