How to dye polyester fabric? Disperse dyeing

How to dye polyester fabric? Disperse dye polyester dyeing process and high temperature dry heat

How to dye polyester fabric?--Disperse dye polyester dyeing process

Dyeing/fixing is accomplished in a high temperature/high pressure/acidic (ph<6) dye liquor using a disperse dye.
The glass transition temperature is different in different regions of the fiber. The amorphous region is about 67 ° C. The crystallization region is about 81 ° C.
Crystallized and oriented region is approximately 125 °C
Polyester fabrics preheated and shaped at different temperatures, different glass transition temperatures Tg setting temperature Tg Unshaped 75 90 105 120 123 150 125 180 122 210 115 230 105 245 90
In actual dyeing, the dyeing temperature should be higher than the dyeing transition temperature. At this time, the macromolecular segment of the amorphous region of the fiber undergoes vigorous movement, and a momentary cavity is generated.
Generally, the dyeing transition temperature is more than ten degrees higher than the glass transition temperature. The larger the molecular weight of the dye, the greater the difference between the two. The polyester microstructure affects the dyeing performance. 1. High temperature and high pressure dyeing
Dyed fabrics are bright in color and feel good
The fabric has good adaptability, wide range of applicable dyes, high dye utilization rate, high requirements on equipment, and need to be sealed.
Intermittent, long dyeing time, low production efficiency. The dyeing solution contains disperse dyes, dispersants, high-temperature leveling agents, pH adjusters and other high-temperature and high-pressure dyeing. The dyes are prone to crystal transition temperature control unevenness, and crystal growth is high. Dyeing, surface dyes are easily precipitated, and some dyes are hydrolyzed or reduced.
Dye requirements: good dispersion stability, chemical stability and high sublimation fastness to ensure uniform and bright dyeing effect;

How to dye polyester fabric?--High temperature dry heat

It can also be dyed under high temperature (190-210 degrees Celsius) dry heat. This dyeing is first dyed on the cloth with a thickener/urea/acid release agent and then melted by hot air to enter the gap between the polyester molecules. Finish dyeing.

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