Dispersing Agent Definition:
The dispersing agent is an organic compound that performs many functions in dyeing. It assists the process of dye particle size reduction and helps to solubilize dye particles i.e. dispersing agent increase solubility of disperse dye in water. Lysol OI, Sarcol NS, etc. are the example of a dispersing agent.
Properties or Characteristics of Dispersing Agent:
Some key properties of the dispersing agents have discussed below:
- It is resistant to alkali, acid, and salt.
- It has dispersing and protective colloid properties.
- The powder brand is a non-hygroscopic powder that is readily soluble in water with any degree of hardness.
- Being anionic in nature, it is compatible with anionic and nonionic products.
- It may also be dissolved by strewing it into the water while stirring.
- In presence of acid-stable dispersing agents, the vat acid (leuco vat dye) is formed as an extremely fine dispersion.
- These are available in the form of yellowish-brown powder light being colored powder dark brown, mobile liquid.
- A 10% solution of the powder has a PH of 6.5 to 7.5 and a solution of up to 40% strength can be prepared.
- It finds expensive to use in the vat acid process of dyeing vat dyes.
- When mixed with cationic produced in the neutral and acidic medium then it may form precipitates.
- The powder has good storage stability.
- When added to the developing baths (0.5 to 2gm per liter) in the azoic dye, the dispersing agents increase the cleanliness of these baths and yield dyeing of improved rubbing fastness.
- It is not a surface-active agent and hence has no wetting, foaming, and detergent properties.
- The powder may be dissolved by pouring 10 to 20 times the amount of hot water over the product and arming if necessary.
- It finds use using in the wet processing of vat, disperse solubilized vat, and azoic (naphthol) dye.