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Brazilian Journal of Chemical Engineering
Print version ISSN 0104-6632
MAZZETTO, S. E.; OLIVEIRA, L. D. M.; LOMONACO, D. and VELOSO, P. A.. Antiwear and antioxidant studies of cardanol phosphate ester additives. Braz. J. Chem. Eng. [online]. 2012, vol.29, n.3, pp.519-524. ISSN 0104-6632. http://dx.doi.org/10.1590/S0104-66322012000300009.
In the search for new applications and products derived from Cashew Nut Shell Liquid (CNSL), we report herein the synthesis and characterization (GC/MS and 1H, 13C, and 31P NMR) of four phosphate esters derived from hydrogenated cardanol, including their applications as antiwear additives for diesel (S500) and as antioxidant additives for mineral oils, evaluated through the HFRR test and oxidative stability analyses, respectively. The results obtained showed very good to excellent performances promoted by the bio-additives evaluated, especially for the thiophosphorylated derivative, which notably reduced the sludge residue and the acidity index of the oxidized oil (0.52 mg NaOH/g sample) and also improved the diesel lubricity, reducing the wear of metal parts by more than 50% (330 μm).
Keywords : Cardanol; Antiwear; Antioxidant; Diesel; Mineral oil.