A Structure and Composition Analysis of Lubricant Additives

Li, S.; Zhou, Liqun; Liyun, H.; Cai-ping, WU

doi:10.1080/15567036.2010.531513

Cited by 1 publication

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“…The composition study of formulated lubricant is currently a long and complex process involving several characterization techniques such as mass spectrometry, nuclear magnetic resonance, infrared spectroscopy as well as separation technique such as liquid or gas chromatography . Indeed, formulated lubricants are complex mixtures composed of base oil(s) and numerous molecular or polymeric additives with different function (detergents, corrosion inhibiter, antioxidant, viscosity modifiers, etc.)…”

Section: Introductionmentioning

confidence: 99%

Rapid analysis of lubricants by atmospheric solid analysis probe–ion mobility mass spectrometry

et al. 2014

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Formulated lubricants are complex mixtures composed of base oil(s) and additives with various functions (detergents, corrosion inhibiter, antioxidant, viscosity modifiers, etc.). Because of the aliphatic nature of base oil and the chemical diversity of additives, the characterization of lubricant is currently a long and complex process. The comprehensive analysis of lubricant samples involves several techniques such as nuclear magnetic resonance, mass spectrometry, chromatography and infrared spectroscopy. The coupling of atmospheric solid analysis probe (ASAP) with ion mobility-mass spectrometry (IM-MS) has been shown to be an efficient tool for the characterization of complex mixture containing vaporizable polar to non-polar compounds. This approach affords the coupling of a direct ionization technique that does not require sample preparation, with a bi-dimensional separation method with high peak capacity. In this work, we show that ASAP-IM-MS is a suitable method for rapid and direct characterization of lubricant samples. Indeed, base oil and additives yielded, by ASAP, ions series which could be separated by IM-MS. Molecular additives such as Zn-dithiocarbamate, phosphite, thiophosphate and Alkyl diphenylamine were ionized as molecular ions [M](+•) or protonated molecules [M + H](+), depending of their polarity. In some cases, fragment ions were observed, confirming the additive identification. In addition, high molecular weight polymeric additives such as poly(alkyl methacrylate) (PAM) were pyrolized in the ASAP source leading to characteristic fragment ions. ASAP-IM-MS is shown to be a powerful tool for studying complex mixtures, allowing the first comprehensive analysis of lubricants in just a few minutes.

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Section: Introductionmentioning

confidence: 99%