Friction and Wear Response of CottonSeed Oils and Esterified CottonSeed Oil and their Blends with Mineral Engine Oil in a Reciprocating Sliding Contact at Severe Contact Conditions

Abstract

Many studies investigating the tribological performance of pure cottonseed and other bio-
based oils have been conducted; a better understanding of vegetable oil tribological
performance at extreme conditions is still required. Little work has been carried out to study
the effect of vegetable oils on the performance of a lubricant formed from a blend of
cottonseed oil and conventional mineral engine oil. This work presents the tribological
performance of esterified cottonseed oil, and their blends with mineral oil, in a high
temperature and contact pressure reciprocating contact. Esterified cottonseed oil were mixed
with commercial mineral engine oil at a blend from 10 to 50% ratio by volume. The
conventional mineral oil was also tested to provide an ideal condition for reference. The
friction performance of the esterified cottonseed oil was competitive to that of the mineral
engine oil. The mineral engine oil was very good in wear resistance over both cottonseed and
esterified cottonseed oil, due to its additives effect. When blended with mineral engine and
esterified cottonseed oils demonstrated a reduction in coefficient of friction up to 50 % blend.
An improvement in wear performance was observed for esterifies and blending with mineral
oils. This work shows that for esterified cottonseed oil when added 10 % with mineral oil, the
performance of blended mineral oil is improved, and that tribological characteristic of
cottonseed oils are improved. That said, the significant limitation of these cottonseed oils is
their ability to provide a satisfactory level of wear resistance. Esterified cottonseed oil shows
an improved result. Simulation model develoed for HC emission based on absoprtion
desorption, HC emission dcreases with increses in engie speed. It is suggested that any future
work in this area should have a greater emphasis on the enhancement of wear resistance, and
studies should be made with different additives.