Ultraviolet (UV) light exposure can lead to photo degradation of perfluoropolyether (PFPE) lubricants, resulting in a change of their physical properties. In this paper, 2,3,4,5,6-pentafluorobenzophenone was used as ultraviolet stabilizer (UVS) to slow down the photo degradation of PFPE. PFPE/UVS mixtures were exposed to UV light and the mechanism of photo degradation was studied with nuclear magnetic resonance (NMR). Small amounts of UVS (less than 0.3 wt%) were found to effectively stabilize both UV photo degradation at the main chain and the end chain of PFPE.
Volume Subject Area:
Lubricants and Additives
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