Abstract
Disperse dyeing for polyethylene terephthalate (PET) fiber in different non-aqueous solvent dyeing systems have been extensively studied over the past decades. In the present work, disperse dyeing for PET was investigated in a silicone solvent dyeing system. The influence of accelerant on the fiber swelling, uptake of dye, K/S value of dyed fiber, and dye solubility in the silicone solvent were systematically investigated. Compared with no accelerant, the final uptake of the disperse dye (C. I. Disperse Blue 367) could increase to 81% with 20% accelerant in the silicone solvent dyeing system, and the K/S value of dyed fiber was also higher (3.3 for no accelerant vs. 13.2 for accelerant). The influence of accelerant on the performance of disperse dyeing was also studied. Firstly, the solubility of the disperse dye in the silicone solvent can be decreased by the accelerant. Moreover, the solubility of the disperse dye is inversely proportional to the K/S value and the uptake of the dye. In addition, although the silicone solvent can diffuse to the inner fiber and has a partial swelling in the PET fiber, the swelling of PET can be improved by the accelerant. Furthermore, the swelling of fiber can reach equilibrium when the amount of accelerant was 15% (the weight of fiber). Therefore, this eco-friendly dyeing technology has considerable potential for application to a broad array of chemical fibers.
Highlights
For the traditional dyeing of polyethylene terephthalate (PET), commercial disperse dyes are generally used for dyeing
The K/S value of dyed fiber increased with the increase of accelerant
The addition of accelerant can effectively improve the color depth of PET, which indicated that the dye uptake is different with different amounts of accelerant
Summary
For the traditional dyeing of PET (polyethylene terephthalate), commercial disperse dyes are generally used for dyeing. Industrialization is extremely difficult due to various factors such as the high cost of dyeing equipment and potential dangers of operation (e.g., the operating pressure of the equipment is very high) [16,17,18,19]. Another approach is to dye polyester textile in the Polymers 2019, 11, 520; doi:10.3390/polym11030520 www.mdpi.com/journal/polymers solvent an organic solvent as the dyeing [14]. Technology was textile inusing the solvent using an organic solventmedium as the dyeing medium this [14].dyeing
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