Properties of Sulphur Dyes | Characteristics of Sulphur Dyes | Features of Sulphur Dye

Properties of Sulphur Dyes
Sulpher dye contains sulpher linkage and dissolve in a solution of Na-sulphide which acts as a reducing agent. In previous article I have explained why so called sulpher dye. In this article I will explain properties of sulpher dyes, features of sulpher dyes, advantages of sulpher dyes and uses of sulpher dyes. The main properties and characteristics features of Sulphur dyes are mentioned below:-
  1. Sulphur dyes have Sulphur linkage within their molecules.
  2. Sulphur dyes are highly colouerd water insoluble dyes. Some dyes are partially soluble in water.
  3. They have no direct affinity towards cellulosic fibres. To make them substantive they are to be converted in to soluble lucoform by treating them with reducing agents (Like dilute Na2S solution)
  4. Sulphur dyes have good light fastness with rating about 4. This light fastness may be improved by an after treatment with metallic salt.
  5. These dyes have excellent wash fastness with rating about 3-4. This good wash fastness is due to its larger molecular size & insolubility in water.
  6. They are not applicable to wool due to strong alkaline condition.
  7. They are exclusively amorphous, few of them show crystallinity.
  8. Important for producing a wide range of shades on a variety of cotton and rayon.
  9. Sulphur dyes are suitable for heavy & durable shades
  10. Available in powder and soluble form
  11. Sulfur dyes are cheap & easy to manufacture.
Water soluble black sulphur dyes
Fig: Water soluble black sulphur dyes

Features of Sulphur Dye
  1. Amorphous Colloidal materials.
  2. High molecular weight with various composition
  3. Complex molecular structure –heterocyclic molecules containing Sulphur linkage.
  4. Decomposed by acids, with the liberation of H2S.
  5. Characterized by thiozine ring, containing Sulphur atom. 
Advantages of sulpher dyes:
Sulpher dyes are so popular in producing black shade. Main advantages are sulpher dyes are given below:
  1. Low cost,
  2. Fair to good light fastness,
  3. High wash fastness,
  4. Easy to apply,
  5. Low energy required,
  6. Chemical resistance is mode rate to good.
  7. Wet fastness good,
  8. Chlorine fastness fair.
Uses of sulpher dyes:
  1. Used to dye of black umbrella cloth,
  2. Used for lining boat,
  3. Used to dye of rubber materials.
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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