Extraction of Cyclic Oligomer and Their Influence on Polyester Dyeing in a Silicone Waterless Dyeing System

Abstract

As a promising new dyeing process without using water, the non-aqueous medium dyeing of polyester has attracted people’s attention and some progress has been made in related research. However, the oligomers of polyester fiber can affect the dyeing of polyester during the use of a silicone waterless dyeing system. Based on this point, the oligomer problem in the silicone waterless dyeing system was investigated. The oligomers of some different types of polyester were extracted by solvent extraction. A treatment method with little influence on the fiber was used to reduce the oligomer content in polyester. The improvement of the dyeing effect of polyester after treatment in silicone medium was studied, and the influence of the oligomer on polyester dyeing was also analyzed. For the dyeing of disperse blue 366, the dye exhaustion was increased by 3.25–3.71%, and the color depth of the dyed sample was increased by 6–13%. Moreover, the colorfastness to rubbing was also improved. In the comparison, the changes in thermal properties and crystallization properties of polyester were tested by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and X-ray diffraction analysis (XRD). The results showed that the thermal and crystalline properties of polyester fiber were not changed before and after solvent extraction.

Cetylpyridinium chloride cationic finishing improves the dyeing and antibacterial properties of madder dyed cotton

“…The four diffraction peaks appeared near 14.7°, 16.5°, 22.7°, and 34.3°, resulted from the diffraction of (101), (), (002), and (040) crystal planes of cotton cellulose, respectively. The diffraction peak positions of the fabrics before and after dyeing did not change, indicating that mordant dyeing, CA + SUA crosslinked dyeing, and CPC/CA + SUA crosslinked dyeing mostly occurred in the non‐crystalline region of the cotton fabric and had little effect on the crystal structure of the cotton fabric 20 …”

“…The diffraction peak positions of the fabrics before and after dyeing did not change, indicating that mordant dyeing, CA + SUA crosslinked dyeing, and CPC/CA + SUA crosslinked dyeing mostly occurred in the non-crystalline region of the cotton fabric and had little effect on the crystal structure of the cotton fabric. 20 Table 2 demonstrates that the crystallinity of the three dyed cotton fabrics had little difference from that of raw cotton (65.06%). It was further shown that the dyeing behaviour mainly existed in the amorphous region of cotton fibre, which basically retained the original crystal shape of the original cotton.…”

Effect of Dispersant on Disperse Dyeing in Silicone Waterless Dyeing System

“…Unfortunately, to date, there are very few dyeing technologies for disperse dyes available in practice with the applicability of a waterless dyeing system, although polyester fabrics are dyed using an environmentally friendly method [ 29 , 30 , 31 , 32 ]. Therefore, the key to waterless dyeing technology is the dyeing medium in the dyeing process [ 33 ].…”