Preparation Of Flame Retardant Viscose Fiber By Molecular Self-assembly

The textile made of viscose fiber has good hygroscopicity,easy dyeing and antistatic.It is widely used in home decoration and high-grade underwear,but viscose fiber is very easy to burn,so it is very important to give viscose fiber good flame retardancy.Molecular self-assembly can enhance the interaction between the flame retardant and the viscose fiber,so that the flame retardant is not easy to fall off from the viscose fiber,strengthen the flame retardant durability of the viscose fiber,and improve the flame retardant efficiency.The viscose fiber with good flame retardancy is prepared by molecular self-assembly technology.By preparing three different flame retardants,they are combined with viscose fibers using self-assembly techniques.The three flame retardants are an inclusion flame retardant,a phosphorylated ?-cyclodextrin and a macromolecular pseudorotaxane flame retardant.1.Taking ?-cyclodextrin as the main component and resorcinol(diphenyl phosphate)as the guest,the inclusion complex of the two is prepared by the saturated aqueous solution method,and various reductive means are used to judge the resorcinol.The inclusion effect of phenyl phosphate and ?-cyclodextrin,wherein the nuclear magnetic results show that resorcinol(diphenyl phosphate)can form a good inclusion complex with ?-cyclodextrin.The flame-retardant viscose fiber was prepared by wet spinning in a viscous collagen solution and tested.The thermogravimetric showed that the residual carbon content at 600°C increased from 13.8% of ordinary viscose fiber to 29.8%.2.Phosphorylated ?-cyclodextrin was synthesized from ?-cyclodextrin and diphenyl chlorophosphate in an ice bath using pyridine as a solvent and an acid binding agent.Through a series of testing methods to determine the effective flame retardant element phosphorus content and possible molecular structure of the flame retardant.The flame retardant was mixed into a viscous collagen solution and wet-spun to produce a flame-retardant viscose fiber.Compared with ordinary viscose fiber,the thermogravimetric shows that the residual carbon content increased from 5.4% to 28% at 800°C,and the material decomposes at a temperature of about 40°C below the decomposition temperature.3.The polymer flame retardant polyphosphate was prepared by using phosphorus oxychloride,methanol and ethylene glycol as raw materials,dichloroethane as solvent and stannous octoate as catalyst.The ?-cyclodextrin and the polyphosphate were used as raw materials to prepare the pseudo-rotaxane by the saturated aqueous solution method,and the pseudo-rotaxane and the viscose fiber stock solution were blended and spun to obtain the flame-retardant viscose fiber.The prepared pseudorotaxane was characterized,and the nuclear magnetic field showed that the polymer flame retardant and the ?-cyclodextrin formed a pseudorotaxane.Thermogravimetric experiments on the obtained flame retardant viscose fiber showed that the residual carbon content at 800°C increased from 5.4% of ordinary viscose fiber to 34.2%.