Properties Of Disperse Dyes
by : Rahul Sharma
PROPERTIES OF DISPERSE DYES:
- Disperse dyes are nonionic dyes. So they are free from ionizing group.
- They are ready made dyes and are insoluble in water or have very low water solubility.
- They are organic colouring substances which are suitable for dyeing hydrophobic fibers.
- Disperse dyes are used for dyeing man made cellulose ester and synthetic fibers specially acetate and polyester fibers and sometimes nylon and acrylic fibers.
- Carrier or dispersing agents are required for dyeing with disperse dyes.
- Disperse dyes have fair to good light fastness with rating abot 4-5.
- The wash fastness of these dyes is moderate to good with rating about 3-4.
- Of all dyestuffs disperse dyes are of smallest molecular size.
- Generally disperse dyes are derivatives of azo, anthroquinone, nitro and quinine groups.
- They do not undergo any chemical change during dyeing.
- In presence of nitrous oxide, textile materials dyed with certain blue and violet disperse dyes with an anthraquinone structure will fade. this is called gas fading of disperse dyes which is a defect of this dye.
