Influence of flame retardants on properties of viscose fiber

The flame retardant viscose fiber Ⅰ,Ⅱ,Ⅲ prepared by prior spinning mixing with TBEP,sodium silicate and melamine,respectively.Their flame retardant properties were evaluated by limit oxygen index,infrared spectroscopy,thermal gravimetry,differential thermal analysis and differential thermal analysis-infrared spectroscopy.Among them,the limit oxygen index of flame retardant viscose fiber Ⅲ was 32.8%,up to the difficult combustion standard.FT-IR shows that the flame retardants were effectively connected to the viscose fiber.TG-DTA shows that the charring is enhanced,while the stage of the dehydration is advanced,and the stages of the oxidation and decomposition become gentle.DTA-FT-IR test suggests that the combustion product is water,CO and CO2.