Eco-Friendly Disperse Dyeing and Functional Finishing of Nylon 6 Using Supercritical Carbon Dioxide

Abstract

Abstract:In this work, a supercritical carbon dioxide assembly was successfully constructed for dyeing Nylon6 fabric. Primary experiments were carried out to confirm the possibility of bringing the dyeing up to factory scale. A series of disperse azo dyes with potential antibacterial activity were applied to dye the fabric under our study in supercritical carbon dioxide (scCO2). The factors affecting the dyeing conditions (i.e., dye concentration, time, temperature and pressure) and functional properties were discussed and compared with those in aqueous dyeing. The comparison revealed that elimination of auxiliary chemicals such as salt, carrier or dispersing agent has no diverse effect on dyeing. The color strength of the dyed fabric evaluated by using K/S measurements increased by increasing dye concentration from 2% to 6% owf. (on weight of fabric). The nylon6 fabrics dyed in supercritical carbon dioxide have good fastness properties, and especially light fastness compared with conventional exhaustion dyeing. Antibacterial activity of the dyed samples under supercritical conditions was evaluated and the results showed excellent antibacterial efficiency.

Supercritical Fluid Applications in the Design of Novel Antimicrobial Materials

“…Excellent results were obtained related to the color quality as well as the antibacterial activity against S. aureus and E. coli [44]. In the following study, Elmaaty et al [45] investigated antimicrobial disperse dyeing of polyamide (Nylon 6) textiles in supercritical and liquid CO 2 . The process was conducted at pressures 5, 10, and 15 MPa; temperatures of 80, 100, and 120 • C, for time 1-3 h, and with hydrozono propanenitrile dyes concentration of 2-6% over the weight fiber.…”

Impregnation of Materials in Supercritical CO2 to Impart Various Functionalities

“…Efficient dyeing and excellent antimicrobial and fastness properties were obtained using scCO 2 dyeing procedure. A series of disperse azo dyes with potential antibacterial activity were also applied to nylon 6 fabric using scCO 2 technique and compared with aqueous dyeing [22]. The comparison showed that samples dyed under scCO 2 medium had excellent antibacterial efficiency and better color fastness properties compared with the conventional exhaust dyeing with the advantage of the elimination of auxiliary chemicals.…”

Synthesis of Some New Thiazolo[3,2‐a]pyrimidine Derivatives and Their Applications as Disperse Dyes

“…It is worth mentioning that azo‐hydrazone tautomerism is of importance not only to dyestuff manufacture but also to other areas of chemistry. Also, azo‐hydrazone tautomers have different tinctorial strengths (and economics) and different properties, e.g., rubbing and washing fastness . From the above and from the conjunction to previous interest in developing synthesis of poly functionally substituted hetero aromatics utilizing readily obtainable and inexpensive starting components , we report here on synthesis of thiazolo[3,2‐ a ]pyrimidine derivatives using β‐ketoanilides 1a–c , aromatic amines, and thiourea 2 as starting materials and as key intermediates for application as disperse dyes for dyeing polyester fabrics.…”