Effect of Calcium Ion Crosslinked Alginate Based Coating on Flame Retardancy of Polyester-Cotton Fabric

Bio-based and phosphorus-free coating was fabricated by layer-by-layer assembly method to obtain the flame retardant polyester-cotton fabric. For the first time, the modified polyester-cotton fabrics were prepared by utilizing positively charged polyethylenimine and negatively charged alginate together with subsequent crosslinking of calcium ion. Scanning electron microscopy and energy-dispersive X-ray demonstrated that the calcium ion crosslinked coating was successfully constructed on the substrate. The flame retardancy was investigated by horizontal flame test. The fire resistance of SA/PEI-Ca sample was enhanced significantly compared with the pure sample, as evidenced by the obvious reduction (16%) of flame spread rate and complete char residue.