Studies On Phosphazene-Derivative Antibacterial Flame-Retardant Protein Viscose Fiber

Viscose fiber is an extremely important textile raw materials and one of the largestregenerated cellulose fiber in China. And it was accepet by the majority of consumersdue to its excellent feel and good moisture absorption, but it is easy to burn. In order tosatisfy consumers’ requirements for safety and environmental performance of the textile,preparing a cost-effective flame retardant viscose fiber has a very important practicalsignificance. In this paper, for the purpose of synthesizing a macromolecularphosphazene derivative, macromolecular phosphazene derivative was added to theviscose glue to blend before spinning to prepare a flame-retardant protein viscose fiber.Flame retardant properties, mechanical properties, thermal stability, and the law ofthermal decomposition of the flame retardant protein viscose fibers were systematicallystudied.The hexachloro cyclotriphosphazene was grafted onto the wool keratinmacromolecules, thereby synthesizing the cyclotriphosphazenekeratins (CCTPK) for thefirst time. The reaction conditions were optimized to obtain the emulsifying system ofdioxane&deionized water&emulsifier, and the ratio of ingredients was HCCTP: woolkeratin=1:2. Infrared spectroscopy results show that, the flame retardants CCTPK ismore suitable for the preparation of the flame-retardant protein viscose fiber throughblending method of wet spinning. The results of differential scanning calorimetry (DSC)and thermal gravimetric analysis (TG) indcated that, the decomposition occurred before300℃, which can promote the carbonation reaction when the thermal decomposition ofviscose fiber, and after386℃the further decomposition of CCTPK could maintain thecarbonized rayon fiber structure preferably.In this paper, the protein retardant viscose fibers were prepared through wetspinning method by blending CCTPK to the viscose glue. The additives were mixed intothe fiber, and a complex physical and chemical reaction happened with cellulosemacromolecules. The results of the infrared spectroscopic analysis suggested that,phosphazene skeleton ring was found in flame retardant protein viscose fiber, and obvious chemical bond between CCTPK amd viscose fibers was revealed too. Theobservation of the morphology of the flame retardant protein viscose fiber before andafter combustion by using the scanning electron microscope (SEM) indicated that, beforethe combustion, the structure of the flame retardant protein viscose fibres is more tightthan ordinary viscose fiber, and foaming phenomenon apparent after combustion, it is inaccrodance with overburden and expansion retardant mechanism. The performance ofcombustion of retardant protein viscose fiber was comprehensively tested by combiningthe limiting oxygen index meter and45°combustion method. With the addition ofCCTPK, the flame retardant protein viscose fibers show excellent flame retardantproperties. After being washed, the flame retardant property of the fibers decreasedslightly, but still has good flame retardant properties.The study of the thermal stability of the flame retardant protein viscose fibershowed that, the carbonization reaction of cellulose in the viscose fibers in the range of170-300℃was greatly promoted by the thermal decomposition of CCTPK, the yield ofthe combustible gas was significantly reduced, the cover layer and the carbide layer wasformed on the fiber surface to protect the internal structure of the fiber, thus giving theflame retardant protein viscose fiber a excellent flame retardant properties. The3Dinfrared spectra of the Thermal decomposition product of flame retardant protein viscosefiber in the air was online monitored by applying hot red hyphenated techniques. Theresults indicated that the major product of the viscose fibres was CO2and H2O, the majordecomposition product of the flame retardant protein viscose fiber was CO2, indicatingthat addition of CCTPK will not be toxic to human body.