Salts plays important role in reactive dyeing by improving the affinity of the dyestuff towards the fibre and acceleration of the dyestuff’s association and lowering its solubility. Normally, Glauber’s salt or common salt/ vacuum salt is used for this purpose.
Is there any salt reducing agent is used for reducing the use of gluber salt?
You could use some cationizer in replace of salt. By using cationizer dyeing factories could reduce huge amounts of salt.
It is possible, but it will be more cost for factory, there is also the risk of having a difficult uniformity of the dyeing and a variation in wash fastness.
K. M. Faridul Hasan brother can you suggest some name of the cationizer which can be used in dyeing floor.
Kazi Md Hasanul Hoque Theres lots of cationizers available commercially in the market. For laboratory using purposes, I have used chitosan in last times. Somebody also have used PDDA(Poly(diallyldimethylammonium chloride)) for cationizing of cellulose in some research work.
Your question itself is not clear. Gluber salt itslef is reducing agent.
Dear Kazi,
You can use Salt.
Salt works as an electrolyte and generally used to increase the affinity of fiber. It also neutralizes the electro negativity of fiber and increases exhaustion rate also control the leveling power (class B- salt controllable dye and class-C dye). Generally Na2SO4 is used for medium shade and Na2SO4.10H2O(Gluber salt) is used for shadow.
Some of the reducing agents of sulphide type are sodium sulphide (Na2S), sodium hydrosulphide (NaHS) and sodium polysulphide (Na2Sx) where x varies from 1 to 6. Some other like NaOCl, NaHSO3 is used as a reducing agent helps to stripping.
Ashish
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