Dyeing Auxiliaries | Classification of Dyeing Auxiliaries According to Function

Dyeing Auxiliaries:
Dyeing auxiliaries mean a chemical or formulated chemical product which enables a processing operation in preparation, dyeing, printing or finishing to be carried out more effectively, or which is essential if a given effect is to be obtained. Main functions of dyeing auxiliaries to prepare the substrate for coloration, to stabilize the application medium, to increase the fastness properties of dyeing, to modify the substrates etc. In this article I will give a list of dyeing auxiliaries and explain some important auxiliaries function in dyeing.
Dyeing auxiliaries
Fig: Dyeing auxiliaries
Classification of Dyeing Auxiliaries According to Function:
  1. Sequestering agent
  2. Lubricants / Anticreasant.
  3. Pretreatment Chemicals
  4. Peroxide killer
  5. Levelling Agent.
  6. Sewuestering, Dispersing and Levelling Agent for Reactive dyeing.
  7. Antifoam.
  8. Salt/Electrolyte
  9. Carrier
  10. pH Control and buffer system.
  11. Desizing agent
  12. Scouring agent
  13. Bleaching agent
  14. Dispersing agent
  15. Anti-pilling agent
  16. Antifoaming agent
  17. Yarn Lubricant
  18. Mercerising agent
  19. Dyefixing agent
  20. Optical Brightener.
  21. Soaping Agent / Washing off Agent.
  22. Softening agent
Functions of important auxiliaries are given below:

Dispersing Agents:
The dispersing agents is an organic compound which performs many function in dying. It assists the process dye particle size reduction and helps to solubilize dye particle i.e. dispersing agents increase solubility of disperse dye in water. Dispersant WS, Dadamol V, Hispogal, Licol OI, Sarcol NS etc are the example of dispersing agents.

Carrier is an organic compound which helps to take up dye at lower temperature and pressure over the textile material. Normally disperse dyeing is done in three ways on hydrophobic fibers (synthctic fibers). At the lowest temperature and pressure dyeing method is done with carrier dyeing. This substances are divided into four chemicals groups . Such as:
  • Phenolic groups
  • Prirnary amines
  • Starch
Tumescal BDN, Carrylon GDX, Tumescal OP 45%, Teraux C, Superlene CR etc. are the example of carriers.

Sequestering agent:
Sequestering agent is very important auxiliaries in dyeing. It is used to remove hardness of water.

Peroxide killer:
Peroxide is harmful for the material. It is used to destroy the remaining peroxide content. Peroxide killers added at the stage of pre bleaching and also at peroxide bleaching processes.

Antifoaming agent:
It is one type surfactant which is able to reduce or prevent foam. Usually used in dyeing bath and in printing paste to prevent foam generation. Excess foam generation can create adverse effect in processing and product. It also reduces dyeing uptake percentage.

Anti-pilling agent:
Some manmade fiber and blended fiber fabrics can easily form pills in their surface. Anti-pilling agent plays a vital role in reducing the pilling in fabrics.
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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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