A cleaner and sustainable preparation of green flame retardant and antibacterial lyocell fabric

Biomass materials have become a research hotspot in flame retardant fields due to the non-toxic and eco-friendly features. Lyocell fiber has excellent properties, but the flammability limits its wider application. To address the issue, a green biomass-based flame retardant (ESOPT) was successfully synthesized by using phytic acid, epoxy soybean oil and taurine as raw materials, which were then used for lyocell fabric modification. The lyocell fabric treated with 10 wt.% of ESOPT possessed antibacterial and flame retardant performance. Compared to control sample, the limiting oxygen index (LOI) of modified lyocell fabric increased from 18% of the control sample to 30%. The peak of heat release rate (PHRR) and total heat release (THR) were reduced by 66.5% and 29%, respectively. TG-IR and char residue analysis confirmed the improved flame retardancy of the modified fabric due to the synergistic action of gas phase and condensed phase. In addition, the inhibition rates of modified lyocell fabrics against Escherichia coli (E. Coli) and Staphylococcus aureus (S. aureus) were 73.9% and 82.5%, respectively. The flame retardant fabricated in the present study is environmentally friendly and suitable for endowing lyocell fabric with dual function. [GRAPHICS] .