Free Access
Volume 27, Number 9, November 1999
Page(s) 804 - 812
Section Original articles
Analusis 27, 804-812 (1999)
DOI: 10.1051/analusis:1999147

Deformulation of metalworking lubricants: Organic phosphorus additives characterization by 1H, 13C and 31P NMR

C. Pierlot1, J. Marko1, C. Faven2, N. Azaroual3, G. Vermeersch3 and J.-M. Aubry1

1  Laboratoire d'Oxydation et de Formulation, ENSC Lille, BP 108, 59652 Villeneuve d'Ascq Cedex, France
2  Laboratoire de Chimie Macromoléculaire, UST Lille I, Bât. C6, Cité Scientifique, 59655 Villeneuve d'Ascq Cedex, France
3  Laboratoire de Physique, Faculté des Sciences Biologiques et Pharmaceutiques, B.P. 83, 59006 Lille Cedex, France

(Received April 28, 1999; accepted July 13, 1999.)

The analysis of two phosphate ester additives found in the formulation of metalworking fluids is reported. These are isopropylated triarylphosphates which are used as extreme pressure additives and polyethoxylated phosphates with emulgating properties. The additives are first analyzed as raw materials; then within a typical lubricant where they are identified and quantified. The methodology makes use of chromatography (TLC, HPLC, SPE) and NMR spectroscopy (1H, 13C, 31P). The valuable contribution of 31P NMR to the deformulation of such products is particularly emphasized.

Key words: Metalworking fluid -- Deformulation31P NMR -- Phosphate ester -- Extreme pressure additive

© EDP Sciences, Wiley-VCH 1999