Preparation And Properties Of Flame Retardants Add Viscose Fiber

Environmental problems have gained more and more attentions. It is desirable for many textile purposes to provide viscose fibers and yarns having greatly decreased flammability. There are many fire retardants that are suitable to viscose fibers and many of them are halogen containing compounds. Among of the halogenated flame retardants, bromine compounds are usually the most effective fire retardants. However, the most useful members of this class cause severe toxicological problems. Therefore, finding little toxic and non-halogen and high effective fire retardant compounds that are suitable to viscose fibers have confronted us all, With the increasing protective sense of eco-friendly, and the eco-friendly laws being settled down, the requirement of non-halogen and little smoke and high effective fire retardants becomes more and more urgent. A lot of new fire retardants that are non-halogen and little smoke and high effective have been born one by one. The new fire retardant compounds that are based on phosphorus such as phosphorus-sulfur, phosphorus-nitrogen compounds have been developed in the past decades. Owing to their specific mechanism of flame resistant and the properties of non-halogen and little toxin and little smoke. in recent years, the wide range of applicability of flame-retardant viscose fibers has drawn the attention of the flame retardant manufacturers and the customers.Bismethyl propanediol dithiopyrophosphate(BMPDTP) flame retardant was synthesiz-ed by reacting methylpropanediol with thiophosphoryl chloride as raw material, dimethyl-benzene as solvent, pyridine and triethylamine as deacid reagent. Compound BMPDTP was characterized by FTIR,1HNMR and MS, The thermal properties of compound was researched based on DSC and TG curves. In addition, the author has optimized and studied the reaction routes and reaction conditions such as the selecting of optimum solution, reaction time and reaction temperature.Methods of Single Fiber Strength Tester Electronic, Limiting oxygen index and Thermo Gravimetric Analyzer were used to investigate the fire-retardant viscose rayon's properties of physics and mechanical, Flammability and thermal stability. The study found that the strength of flame-retardant viscose fiber decline in a single wire comparing to viscose fiber precursor, but it does not affect the performance of fiber spinning; Limiting oxygen index analysis showed that:With the increased levels of flame retardants, LOI of flame retardant viscose fiber grows larger, when the content of the fire retardant is greater than 20%, the viscose fibers can meet the requirement of fire retardant. thermogravimetric analysis showed that the thermal stability of flame-retardant viscose fiber has been greatly improved comparing to the original wire.