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Cotton fibre dyeing in textile

Dyeing is the process of coloring fibers, yarns or fabrics using chemicals. Different types of dyes are used for different dyeing processes and for cotton dyeing specifically. Reactive, vat, sulphur, azoic, basic, and natural dyes can be used. Reactive dyes must be anionic, soluble, lightfast, washfast and fix under alkaline conditions. Azoic dyes must be soluble but produce insoluble color, have excellent lightfastness and increased rubfastness. Sulphur dyes must produce sulphur linkages, be insoluble in water but soluble when mixed with reducing agents under alkaline conditions. Dyeing requires additional chemicals like solubilizing

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Dyeing: Dyeing is the process of coloring fibre, yarn or fabric by using different types of chemicals. Mostly different types of dyes are used for different dyeing processes.
Cotton Dyeing Different Types of dyes are used for cotton dyeing. Reactive Dyes Vat Dyes Sulphur Dyes Azoic Dyes Basic Dyes Natural Dyes All Purpose Dyes
Required Properties for Reactive Dye  Must be anionic to attract cellulose  Need to have good solubility  Must have good light fastness  Must have good wash fastness  Fixation must be done under alkaline condition  Need to have less time requirement  This dye is cheap and available
Required Properties of Azoic Dyes  Die will be soluble but final color will be insoluble  Have to have excellent light fastness  Rub fastness should be increased as much can.  Less binding effect should be created by Azo dye  Temperature should keep <10 degree Celsius during dyeing.
Required Properties of Sulphur Dyes  Must produce sulphur linkage with fibre  Need to be insoluble in water  Reducing agent requirement should be good  Must mix with reducing agent properly to be soluble  Dyeing is done under high alkaline condition  Shade & wash fastness should be good.
Other chemicals used for dyeing process of cotton: • Solublizing Agent • Reduction Agent • Alkali • Binding Agent • Wetting Agent • Antifoaming Agent • Anti-migrating Agent • Electrolyte
Requirements of the dye auxelariex Solublizing Agent Increase the solubility of dyes Controls the sublimation at high temperature Reduction Inhibitor Mild oxidizing agent controls the reduction of dyes at high temperature or during steaming. Binding Agent Use as an adhesive to fix the pigment dyes on cotton fiber at high temperature.
Requirements of the dye auxelariex Alkali Caustic: Controls the rate of reaction between dyes and cellulose or in other words it is used for fixation of Reactive Dyes. Soda Ash: Controls the rate of reaction between dyes and cellulose or in other words it is used for fixation of Reactive Dyes. Increases the fastness properties during washing
Antifoaming Agent Used to prevent formation of foam during stirring or during dyeing in one bath. Anti-migrating Agent Increases the viscosity of dyeing liquor to protect migration of dyes under high temperature. Electrolyte Decreases solubility of dyes in liquor Increases affinity between dyes and fiber under moist condition
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