Journal
JOURNAL OF CO2 UTILIZATION
Volume 33, Issue -, Pages 365-371Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.06.018
Keywords
Supercritical carbon dioxide; Azo pyrazole; Oxopropanenitriles dye; Poly propylene; Pilot scale dyeing
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A new synthetic route was developed to create azo based dispersed dyes which are derived from 3-(3-Chloropheney)- 2-((4-substituted) diazenyl)-3-oxopropanenitrile and 3-substituted 5-amino-4-arylazopyrazoles. The new dyestuff was used to dye unmodified polypropylene fabrics under both aqueous and supercritical carbon dioxide mediums. A pilot scale experiment was performed on the dyestuff 3a to prove the potentiality of the dyestuff toward polypropylene fabric. The new dyes were characterized by MS, IR and NMR spectral data and found to be in good agreement with the proposed structures. The colour uptake expressed as colour strength (K/S) was assessed and the values obtained showed that the dyed polypropylene fabrics using scCO(2) method was significantly better than the aqueous one. The colour fastness properties of all the dyed fabrics were evaluated and exhibited excellent results. Moreover, it is also a green approach for using industrial emissions of CO2 instead of water in the textile dyeing process.
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