Dyeing mechanism of disperse dye on bi-component sheath-core fiber with low melting point

The paper took bi-component sheath-core fiber with low melting point as the main research object.Two typical disperse dyes such as Disperse Red SE-GFL(azo) and Disperse Blue 2BLN(anthraquinone) were used to dye the fiber.The dyeing kinetics and dyeing thermodynamics of disperse dye on the bi-component sheath-core fiber with low melting point were studied as well.The results showed that the type of adsorption isotherm of disperse dye on bi-component sheath-core fiber with low melting point was the same as that on conventional polyester fiber,both of which are conforming with Nernst distribution mechanism.Compared with dyeing with disperse dye on the conventional polyester fiber,dyeing with disperse dye on the bi-component sheath-core fiber has some features,i.e.the dyeing rate increases greatly,half-dyeing time decreases,diffusion coefficient and dyeing affinity enhance,dyeing heat and dyeing entropy reduce.