The Study Of Aging On The Properties Of Halogen-free LGFPP Flame Retardant System

In this paper,LGFPP/IFR flame retardant composites were written by melt blending method.The effects of thermal oxidative aging,UV aging and natural aging on the structure and properties of flame retardant materials were routinely studied.With the aid of combustion performance test,TGA,Cone,SEM,EDS,activation energy and mechanical property determination of flame retardant materials on the performance of a whole.Explore three aging mode of long glass fiber reinforced polypropylene composite material properties are studied and improve its use of the field,and according to the theory of thermal degradation,to explore the three aging ways,long flame retardant glass fiber enhanced polypropylene composite thermal degradation reaction mechanism.Under the conditions of thermal oxygen,ultraviolet and natural aging,the oxygen index of the flame retardant materials showed a trend of first standing up and then falling.The EDS test showed that the three kinds of aging methods had different degrees of the migration of flame retardant.And there was no melt dripping phenomenon.The thermal stability of the flame retardant materials was changed under the conditions of thermal oxygen,ultraviolet and natural aging,and the thermal stability of the flame retardant materials.After a certain length of aging treatment,the initial decomposition temperature of the sample is raised,and the thermal stability is increased.The prolonging of thermal oxidative aging time has not much effect on the T_5%and T_max of the LGFPP/IFR flame retardant system.The ultraviolet aging has significant influence on the thermal stability of the materials,and then gradually slows down,and the effect is weakened.Biological aging has little effect on the maximum decomposition temperature of the composites,and the mean difference between the aged samples and the samples is not.In the three kinds of aging,the activation energy of the flame retardant LGFPP composites showed different degrees of decline,and the activation degree increased.Thermal oxidative aging of flame retardant materials is mainly source in polypropylene auto oxidation and migration behavior of flame retardant;flame retardant UV aging source in the auto catalytic process,mainly in accordance with the free radical reaction of the decomposition process,combined with the combined effect of the flame retardant migration;and in natural conditions,the use of polymer materials with the presence of oxygen,is excited by the C-H bond,it is very easy to be oxygen removal,the formation of dehydrogenation of peroxide and flame retardant materials according to the mechanism of oxidative degradation,and IFR migration interaction.The cone calorimeter(cone)test results showed that the thermal oxygen,ultraviolet and natural aging,TTI was first increased and then decreased,the HRR showed two peaks,the first peak significantly much in the second peak and three aging under the first peak were lower than the first peak of the unaged specimens.UV aging and natural aging of the additional peaks compared with thermal oxygen aging,more gentle.Report to the three aging methods of the macro-like pattern,there are different degrees of color deepening phenomenon,in which the color of the samples after thermal oxygen aging is more obvious than the other two kinds of aging.And three kinds of aging treatment after the samples are different degrees of the phenomenon of power.Resin PP matrix molecular chain fracture,reduce the degree of regularity.Glass fiber and PP interface binding force is reduced,which leads to the mechanical properties of the samples decreased under the three aging methods.