Disperse dyeing


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Disperse dyeing

  1. 1. Disperse Dyes
  2. 2. Disperse Dyes • The term “disperse dye” have been applied to the organic colouring substances which are free from ionizing groups, are of low water solubility and are suitable for dyeing hydrophobic fibres. • Disperse dyes are the only water insoluble dyes that dye polyester and acetate fibers. Disperse dye molecules are the smallest dye molecules among all dyes.
  3. 3. • Disperse dyes are used for dyeing man made cellulose ester and synthetic fibres specially acetate and polyester fibres and sometimes nylon and acrylic fibres. • Carrier or dispersing agents are required for dyeing with disperse dyes. • Disperse dyes have fair to good light fastness with rating about 4-5.
  4. 4.  MECHANISM OF DISPERSE DYE Wander Wall’s Forces. High affinity for Fibers. Attraction between Fiber Surface and the Dye Molecule.  STRUCTURE
  5. 5.  SOLUBILITY Non-Soluble in Water.  CHARGEABILITY Neutral Charge. Penetrate Because of Transition State of Synthetic Fibers.  ENVIRONMENT BEHAVIOUR Non-Environmental Friendly. Human effect dyeing method.
  6. 6.  FASTNESS PROPERTIES Washing : Good . Lightening : Good . Crocking : Good . Gas Fume Fade : Average .  APPLIANCES They are Applied to Synthetic Fibers such as Acetate, Triacetate, Polyester, Nylon and Acrylic.
  7. 7.  COLOUR RANGE Wide Range of Colors. Bright and Lighter Shades. Major Colors: Pale Yellow and Blue.  COST Cheap method for dyeing process .
  8. 8. Other agents used in Polyester dyeing  Dispersing Agent • It increases the solubility of the dye in water . • It helps to increase the rate of the dye exhaustion .
  9. 9.  Leveling Agent • Leveling agents hold the rate of the dyeing and helps to get uniform dyeing. Buffer • These agents protect the dye from reduction in high temperature bath .
  10. 10.  High temperature dyeing process .  Thermosol process.
  11. 11. High Temperature Dyeing Process • High temperature dyeing of polyester can be done in Beam Dyeing machines , Jet dyeing machines and Pressure Jiggers . • This method dye applied under pressure at temperature of about 130`c . • Heating help to swell the highly compact polyester polymer and make available more space for the dye molecule to enter in to the amorphous region of the fiber .
  12. 12. Dyeing Of Polyester Fabric With Disperse Dyes By High Temperature Exhaust Method Procedure : Prepare The Dye Bath Using The Recipe Below • M:L:R • Ammonium Sulphate • Dispersing Agent 1:30 to 1:40 2g/l 0.5g/l
  13. 13. Dye The Sample Using The Following Dyeing Cycle
  14. 14. Dyeing With Disperse Dye ( High Temperature Exhaust Method ) • First the dye bath is made with the dye , dispersing agent and the temperature is raised to 60`C . • Next , Formic acid and Ammonium-Sulphate added till the pH is 5-6 . • The dyeing should be continued and the temperature is raised to 130`C over period of 45 min. • Then temperature reaches 130`C dyeing is done for 1 hour . • Rinsed the sample with cold water . • Removal the disperse dye on the surface of the fabric by using Caustic Soda and Sodium Hydrosulphite and rinsed , Neutralize the sample.
  15. 15. Thermolsol Process • This process is suitable for mixed fabric of Poly-Cotton or Poly-Wool . • The thermo-sol dyeing process is consists of the following stages . Padding Drying Thermofixing After Treatment
  16. 16.  Padding The Padding Carried Out At 30 - 40`C With The Following Ingredients • • • • • • Dispensing Agent Water Disperse dye Acetic Acid ( pH 6 – 7 ) Wetting Agent Neutral alginate thickener
  17. 17. Thermosol Process • After padding the cloth with the dye and the other dried . • Next stage is fixation of the disperse dye , the cloth is passed through a hot air pin stenter for 60 second at 190 – 210 `C. • After heat treatment the cloth washed .
  18. 18. Thank You Ashan Ranasinghe Gayan Weerasinghe