Problems of Dyeing Polyester With Disperse Dyes


Polyester are the synthetic fiber. They are essentially undyeable below 70–80 °C, leaving only a 20– 30 °C range for increasing the dyeing rate before reaching the boiling temperature. At any temperature, the rate of dyeing of polyester with a given disperse dye is very much lower than for cellulose acetate or nylon fibers. The rate of diffusion of disperse dyes into the polyester below 100 °C is so low that dyeing at the boil does not give reasonable exhaustion. The rate of dyeing is higher for dyes of small molecular size that have higher diffusion coefficients. Dyeing is faster when using fiber swelling agents called carriers to improve the fibre accessibility, or when dyeing at higher temperatures above 100 °C to increase the dye diffusion rate. Dyeing of polyester with disperse dyes have good light fastness. This does not always correlate with the light fastness on other fibres such as cellulose diacetate.
Disperse dye
Dyeing Problems and Their Solution of Polyester with Disperse Dye: Though dyeing of Polyester with Disperse Dye is very compatible, they have some problems occur during dyeing. Problems and solution are given in table:


Problems

Solution

Dyeing levelness
 

          Compatible disperse dye combination
          Disperse dye C faction
          Disperse dye with good migration
          Addition leveling agent

  Color-repetition

          Compatible disperse dye combination
          Not disperse dye sensitive to temperature                variation ( disperse dye C faction )
          Not by sensitive dye to pH
          Not by sensitive dye to time
 

  Colorresilience
( Thermo migration )

          Disperse dye selection
          Softener selection
          Beware of when drying process of end
 

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