Study On Synthesis And Application Of Hexachlorocyclotriphosphazene And Cyclotriphosphazene Flame Retardant Catalyzed By Ionic Liquid

With the development of science and technology,all kinds of polymeric materials have being gotten more and more extensive application at present.However,the fire accident which triggered by these polymeric materials are also gaining increasely.The fire accident not only caused casualty and property loss,but also caused environmental contamination.Therefore,the development of flame retardant of high-performing and eco-friendly becomes the concerning focus of scientists.Hexachlorocyclotriphosphazene is one of the most important compound of phosphazenes chemistry.It is a hexatomic ring compound containing three phosphorus and three nitrogen atoms,with alternating bonds,each phosphorus bearing two active chlorine atoms.The phosphazene-based flame-retardant synthesized using hexachlorocyclotriphosphazene has the advantages of low-smoke,no-halogen,good thermal stability,flame-retardant property.It has becoming one of the most promising product to achieve the non-halogen flame retardant.This research studied and synthesised hexachlorocyclotriphosphazene by adoptin-g mixed catalyst/acid binding agent synthesis system.Ionic liquid,which can be used as solvent as well as catalyst,was selected as a catalyst to replace traditional Lewis c-atalyst.Moreover,this article synthesized three kinds of phosphazene-based flame-ret-ardant with hexachlorocyclotriphosphazene.They are hexaphenoxycyclotriphosphaz-ene,hexakis(4-methylphenoxy)cyclotriphosphazene,hexakis(4-nitrophenoxy)cyclotri-phosphazene.Discuss factors such as reaction time,the reaction temperature,the rea-ction molecular ratio and so on by using the orthogonal experiment and single factors experiment,the optimum technological conditions were determined.Hexachlorocyclotriphosphazene:the material ratio of n(NH4C1)and n(PCls)being 1.25:1,the reaction temperature being 125?130?,the material ratio of n(catalyst)and n(PCI5)being 0.05:1,the material ratio of n(pyridine)and n(PCls)being 3:1,the reaction time being 3.5 h,the yield of hexachlorocyclotriphosphazene was up to 66.5%.Hexaphenoxycyclotriphosphazene:the reaction temperature being 90?95?,the material ratio of n(Sodium phenolate)and n(Hexachlorocyclotriphosphazene)being 6.5:1,the reaction time being 10h.Under the optimum condition,the yield of hexaphenoxycyclotriphosphazene was up to 78.5%.Hexakis(4-methylphenoxy)cyclotriphosphazene:the reaction temperature being 85?90?,the material ratio of n(Sodium 4-methylphenolate)and n(Hexachlorocyclot-riphosphazene)being 6.6:1,the reaction time being 9.5h.Under the optimum conditi-on,the yield of hexakis(4-methylphenoxy)cyclotriphosphazene was up to 83.1%.Hexakis(4-nitrophenoxy)cyclotriphosphazene:the reaction temperature being90?95 ?,the material ratio of n(Sodium 4-nitrophenolate)and n(Hexachlorocyclotri-phosphazene)being 6.3:1,the reaction time being 11h.Under the optimum condition,the yield of hexakis(4-nitrophenoxy)cyclotriphosphazene was up to 76.7%.IR,31P NMR were used to characterize their chemical structures,matching with the theory.TG was used to detect the thermal stability of three phosphazene-based flame-retardants,the result show that they have good thermal stability.The applications of hexaphenoxycyclotriphosphazene on PC/ABS and PP were studied and discussed,the result show that hexaphenoxycyclotriphosphazene have excellence comprehensive performance.