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Evaluation and application of vat dye on cotton fabrics using hydros with glucose or sucrose as a reducing agent

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  1. Abstract of synthetic fibers
  2. Acknowledgements
  3. List of tables
  4. List of figures
  5. Introduction and literature survey
  6. Aim of the project
  7. Materials and methods
  8. Results and discussions
  9. Conclusion
  10. Bibliography

Although the synthetic fibers have dominated the textile market, consumer has still preference towards cotton. Today cotton can be manufactured but the natural merits obtained in cotton cultivated in different areas of the country cannot be underestimated.

A number of research studies are reported on the chemical modification of cotton using types of agents. In this regard, the present study considers the affect of reducing agent on the fabric properties.

The starting material was 30sX20s single sheeting fabric producing normally in most acceptable widths. The fabric was desized, scoured, bleached before dyeing with vat dyes. During dyeing hydros, glucose and sucrose were used as reducing agent. The fabric was tested for air permeability, fabric thickness , tearing strength, bending length and crease recovery from grey to dyed state using standard methods as prescribed by IS Hand book.

[...] When air is beaten into the solution, the indican combines with oxygen to produce indigotin or ?indigo blue.? Indigo blue is insoluble and settles out of the solution to produce the blue indigo dyestuff Application of vat dye involves five stages: AQUEOUS DISPERSION: The insoluble vat dye is dispersed in water. VATTING: This step involves the chemical reduction of the vat dye to produce the soluble, reduced or leuco form of the dye. This is achieved by sodium hydro sulphite, sodium hydroxide and water. [...]

[...] The reductive decomposition of the excessive dye by sodium hydrosulfite improves the color fastness. Sodium hydrosulfite's reduction reaction removes residual oxide and wrong pigments. Sodium hydrosulfite is a reductive bleaching agent. It reduces carbonyl and alcohol groups, which function as colorants of the substances Dyeing mechanism with Hydros: Na2S2O4 +2H2O 2NaHSO + 2 H 2 >C=OH 2 >C=OH+2 2 >C-ONa + H2O 2 NaHSO3 + 2 2 Na2SO3 +2H2O 1.4 Glucose: Glucose a monosaccharide (or simple sugar), is an important carbohydrate in biology. [...]

[...] sucrose when compared with hydros in vat dyeing maintain at same conditions and same percentage of chemicals and this indicating the surface smoothness imparted by reducing agent. A special feature of the present investigation is that reducing agent is replaced by glucose to make the act Eco-Friendly. Chapter 1 INTRODUCTION AND LITERATURE SURVEY 1.0 Introduction: Vat dyes, so called because indigo, the first member belonging to this class of dyes was dyed on textile materials in wooden vats (tubs) in ancient days, are water insoluble colored compounds. [...]

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