Disadvantages Of Reactive Dyes
by : Rahul Sharma
Disadvantages Of Reactive Dyes:
The main disadvantages of reactive dyes are as follow:
1. The utilization rate is not high enough (generally 60% - 70%). The dyeing process produces a large amount of colored sewage, and its COD value is generally between 0.8 and 30,000 ppm, and thre COD value of concentrated waste water is more than 50,000 ppm.
2. In oder to suppress the charge on the surface of the fiber, a large amount of electrolyte is consumed when using the reactive dye, which not only increase the labour intensity, but also raises the concentration of chloride ions in the wastewater to more than 100,000 ppm, therby greatly increasing the difficulty level of the treatment of dyeing wastewater.
3. Some reactive dyes cannot meet the requirments of the market, such as their light fastness to wetness, wet rubbing fastness, and the light fastness of azo red dyes and azo blue dyes in light colors.
4. There are few dark varieties of reactive dyes that can replace sulfer dyes and vat dyes.
5. Synthetic filaments liquefy and consume effectively
6.Synthetic strands are no biodegradable. Consequently, they cause soil contamination.
