Sulphur Dyes

THE FIRST SULPHER DYE WAS DISCOVERED IN FRANCE IN 1873,AND FURTHER WORK DONE BY Raymond Videl enabled the manufacture of Videl black.Its outstanding fastness to light,washing and boiling far surpassed any cotton black known at that time. The general disadvandage of the sulpher dyes that they produce dull shades and lack a red.The main advandage lays in their cheapness,ease of application and good wash -fastness. In their nomal state sulpher dyes are insoluable in water but are readly soluable in the solution of sodium sulphide.In this form they have high affinity to the all cellulose fibers. USE: An outstanding member of this famly is sulpher black.It dyes all cellulose fibers, but particularly linen and jute,to a lustrous and deep black with excellent wash and light fastness. Sulpher dyes are dyed frome a dye bath containing sodium sulphate and common or Glaubers salt ,and are oxidized by airing or with some oxidizing agents(sodium Bichromate or Hydrogen Peroxide) in a fresh bath.

 

 

Product List

 

DYEING METHOD OF SULPHER DYES

1.Microtherm dyeing
1.1 Dyeing procedure

1.2 Notification

Dyeing is started advantageously at 60 c in the case of dyes which are too be dyed hot, the tempreature is raised to the boil slowly and the material dyed naer the boil for 45 -60 minutes.

dyes could be carried out at the temperature above 80 c for 45-60 minutes by the initial temperature at 50-55c

with dyes which yoked brighter and in particular fuller dyeing at low temperature,the goods are entered to the dye bath at 30-40 c,and dyed at 50 -60 c for 45 minutes.Also when pale shades are needed,goods are entered entered at low tempereture and the bath should be heated gradually.In this case,dyeing is carried out best without addition of sodium sulphate.

2.After treatment

After dyeing,hydroex treated or squeesed off carefully-Rinse throughly-oxidized by airing or oxidezed(with three methods)-Rinse and soaping