What dyes are used for dyeing polyester fabrics? Polyester fabric dyeing disperse dye, polyester, also known as polyester, full name polyethylene terephthalate, is an organic synthetic fiber completely free of hydrophilicity. Therefore, conventional direct, acidic, active and other water-soluble dyes cannot be adsorbed onto such hydrophobic fibers, and thus cannot be dyed. The reducing and sulphur-based dyes, because of their large molecules and larger molecular association particles, are even less able to penetrate into the interior of polyester macromolecules with high crystallinity and dense structure.
The disperse dye is a small molecule pigment without a water-soluble group, has a good affinity with the hydrophobic polyester, and has a small molecule, and can be drilled when the polyester fiber is expanded under the influence of high temperature. The gap between polyester fibers, therefore, can only be used to dye polyester.