The Study of the Possibility of Using Expired Ultraviolet Stabilizer (Tinuvin 770) in Polypropylene

Abstract

TINUVIN 770 is a light stabilizer for stabilization of polymers, especially polypropylene against UV light that used worldwide. This compound has a high stability in dry conditions, away from direct sun light and in acidic condition is resistant to degradation and decomposition. The purpose of this research is the examination of the possibility of using expired TINUVIN 770 that besides the economic savings for the petrochemical industry, replace the applied method of using in expired materials in similar cases entering dozens toxic chemicals in Eco. This research is based on the identification methods of polymer additives such as high performance liquid chromatography coupled with ultraviolet spectroscopy(HPLC-UV), gas chromatography coupled with mass spectrometry(GC-MS) and comparison of the results obtained for the studied case (expired) and sample with date as the standard. Initially, DSC tests was performed on each sample to determine their thermal behavior. The FT-IR Spectrum of both samples was obtained. By UV-scan determined that both samples have UV absorbance in 270nm. The samples were analyzed by HPLC-UV, in this wavelength, and the same results were obtained for the two samples. Using GC-MS and comparison of the results obtained for the sample and standard it was proved the usability of   expired TINUVIN 770.