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Basestock Oils for Lubricants from Mixtures of Corn Oil and Synthetic Diesters
Author(s) -
Pop Loredana,
Puşcaş Cosmina,
Bandur Geza,
Vlase Gabriela,
Nuţiu Remus
Publication year - 2008
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-007-1156-z
Subject(s) - lubricant , differential scanning calorimetry , flash point , synthetic oil , thermogravimetric analysis , environmentally friendly , biodegradation , vegetable oil , thermal stability , materials science , mineral oil , corn oil , organic chemistry , pour point , pulp and paper industry , chemistry , chemical engineering , composite material , scanning electron microscope , base oil , food science , ecology , physics , biology , engineering , thermodynamics
Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral‐based lubricants. Vegetable oils have high biodegradability and low production costs. Their poor thermo‐oxidative stability and poor low temperature properties are disadvantages in their use as lubricant basestocks. In our study we used corn oil and diester mixtures, which become lubricants when additives are introduced. These mixtures of corn oil and di‐2‐ethylhexyl‐adipate (DOA) and di‐2‐ethylhexyl‐sebacate (DOS) offer a wide range of kinematic viscosities, pour points lower than −39 °C and flash points over 218 °C. The diameters of wear scars measured under four‐ball testing (40 daN) are less than 0.90 mm and the copper strip corrosion test result is 1a. The differential scanning calorimetry study and thermogravimetric study under nitrogen atmosphere and in synthetic air are reported. From these studies a higher thermal stability was observed for corn oil than for diester oils. The thermo‐oxidative instability occurred at temperatures higher than 350 °C. The low production cost of corn oil and its mixtures with diesters makes them an attractive alternative to mineral oil lubricants.