Exhaust dyeing of polyester‐based textiles using high‐temperature–alkaline conditions

Abstract

ABSTRACT:The factors affecting the dyeability of polyester-based textiles with disperse dyes in an alkaline medium were studied. It was found, for a given set of dyeing conditions, that (a) the appropriate conditions for attaining a higher color yield were 45 min at 130 o C with pH 9 using a material-to-liquor ratio of 1/10; (b) increasing the Diaserver AD-95 concentration to 2% ows (based on weight of substrate) as well as including triethanolamine to 2% ows in the dyeing formulations bring about a significant improvement in the dye uptake; (c) both a preheat setting from 160 to 200 o C/30 s and an alkaline weight reduction have a positive impact on postdyeing with the used disperse dye; (d) the extent of dye uptake as well as the color strength are governed by the type of substrate, that is, knitted fabric Ͼ spun yarn Ͼ woven fabric, nature of the dye stabilizer, that is, EDTA Ͼ Diaserver AD-95 Ͼ Tinoclorite CBB Ͼ citric acid Ͼ none, as well as kind of the disperse dye; (e) direct reuse of the disperse dyebaths, without reconstitution, in the dyeing of the used substrates was shown to be feasible in a single shade and in the reverse-order dyeings (dark 3 light); (f) one-bath, one-step exhaust dyeing of polyester/ cotton-knitted fabric using selected disperse reactive dyes combinations under high-temperature alkaline conditions is feasible; and (g) the color and fastness properties of the resultant dyeings depend on the type of the used auxiliaries, in addition to the nature of disperse/reactive dyes combinations as well as compatibility with other ingredients.

4‐Hydroxy‐3‐methyl‐6‐(1‐methyl‐2‐oxoalkyl)pyran‐2‐one Synthesis by a Type III Polyketide Synthase from Rhodospirillum centenum

“…These textiles have various applications such as bio‐feedback, health monitoring, and hepatics 1. Polyester (PET) fiber is a widely used textile material due to its high strength, dimensional stability, as well as suitability for blending with other fibers 2, 3. Friction causes abrasion of coatings during the product lifecycle.…”

Surface modification and smart functionalization of polyester-containing fabrics

“…lower extent of surface modification and generation of terminal active sites (ÀCOOH groups). On the other hand, the decreasing trend of basic dye uptake (Figures 7 and 8) at higher LR is most probably due to a shortage in number of generated-accessible active sites (ÀCOOH groups) which serve as centers for picking up and fixing the cationic dye molecules onto the modified fabric surfaces [26].…”

Modeling of disperse dye adsorption on modified polyester fibers

“…It is often called the peeling of polyester because by measuring the diffraction of X-rays, it is proved that alkali hydrolysis appears only at the surface of fibers, and the inner morphological structure of fibers stays unchanged. Treatment of fabrics with alkali leads to the decrease of fiber diameter and exposure of the new surfaces and hence the fabric properties will change (5)(6)(7)(8).…”