Dye is a coloring agent used to bring attractive shades to different types of fabrics. Disperse colorants are non-ionic chemicals that are insoluble in water. They are mainly used to induce shades to polyesters and to some extent; they can be used on materials like nylon, cellulose, cellulose acetate, and acrylic.
Due to their low water solubility feature, they are best suitable for coloring and printing hydrophobic fibers. The polyester fibers, such as synthetic textiles, are hydrophobic. That means they cannot be colored with water-soluble chemicals because synthetic or semi-synthetic polymers do not absorb them properly. That is the reason why water-insoluble colorants are used to induce attractive shades polyester fibers. These dyes must be dispersed before application.
- These are organic dyeing agents
- Non-ionic compounds
- They can be applied under high temperatures e.g. 130 degree Celsius.
- In some cases, temperature requirements may vary according to the type of method used to bring shades, such as carrier method, high temperature method, or thermosol process.
- Dispersed in the dye liquor (most preferred medium is an aqueous liquor which converts colorant into fine particles)
- They bind to polyesters by creating H-Bonds