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Polypropylene due to its method of synthesis is simple , and has balanced mechanical properties , high heat distortion temperature , water absorption is low , thus becoming one of the plastics industry , the species most used . The proposed system of Nano TiO 2 nano-ZnO and bulk TiO 2 powder modified polypropylene material aging resistance and UV-Vis spectra and FT -IR spectroscopy. XRD, SEM, TEM and other analytical tools to study the changes in the mechanical properties of polypropylene composites after aging . And the combination of UV - visible and IR spectra analysis of the causes and mechanism of ultraviolet aging properties of the composite system . The results show that : the adding nano TiO 2 , nano-ZnO and bulk TiO 2 certain degree of impact strength and anti-aging properties of the composite material after aging gap improved , when the organic ultraviolet light stabilizer and an organic ultraviolet light absorber and a certain amount when used together , due to their synergistic effect can be significant and lasting improvement in the anti-aging properties . By the composite modified artificial accelerated aging process , UV-Vis absorption spectra and transmission spectra study can be found with the aging time , absorb light in the ultraviolet region by adding nano of TiO 2 < / sub>, nano ZnO and body , TiO 2 , have been greatly improved , compared with the pure polypropylene resin to absorb better performance . Separately added organic ultraviolet absorbers and ultraviolet organic light stabilizers , anti-aging properties of the light absorption in the ultraviolet region is not very satisfactory , and the inorganic powder used in combination, can significantly improve their deficiencies in this regard , full play to their respective characteristics . Due to nano- TiO 2 particle characteristics , its performance is superior to the bulk TiO 2 . Means of infrared spectroscopy to analyze the changes in the molecular structure of the aging process of the composite , and found that with the aging time , the decomposition of the oxidation of pure polypropylene , 1643 1 850 cm -1 < / sup> at the carbonyl absorption peak appears significantly enhanced widened . And when added to the organic UV stabilizer and an organic UV absorbers
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