SULPHUR DYES for cotton, linen and fiber.

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Description:

The first Sulphur 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 disadvantage of the Sulphur dyes that they produce dull shades and lack a red. The main advantage lays in their cheapness, ease of application and good wash fastness. In their normal state Sulphur dyes are insoluble in water but are readily soluble in the solution of Sodium Sulphide. In this form they have high affinity to the all cellulose fibres.

USE: An outstanding member of this family is Sulphur black. It dyes all cellulose fibres, but particularly linen and jute, to a lustrous and deep black with excellent wash and light fastness. Sulphur dyes are dyed from a dye bath containing Sodium Sulphide and common or Glaubers Salt, and are oxidized by airing or with some oxidizing agents (Sodium Bichromate or Hydrogen Peroxide) in a fresh bath.

DYEING METHOD OF SULPHUR DYES

1. Microtherm dyeing

1.1 Dyeing procedure

1.2 Notification

Ⅰ Dyeing is started advantageously at 60°C ,In the case of dyes which are too be dyed hot, the temperature is raised to the boil slowly and the material dyed near the boil for 45-60minutes.

Ⅱ Dyes could be carried out at the temperature above 80°C for 45-60 minutes by the initial temperature at 50 -55°C .

Ⅲ 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, the goods are entered at low temperature 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 squeezed off carefully →Rinse thoroughly → Oxidized by airing or Oxidized (With three methods) → Rinse and soaping

3. PRODUCTLIST OF SULPHUR DYES