Calixarenes as antioxidant additive for lubricants
A.S.Gusak, L.A.Khamidullina, P.E.Prokhorova, А. А. Phatjyanova, Yu.Yu.Morzherin1
1
Ural federal university,
620002, Russia, Ekaterinburg, Mira st., 19.
E-mail: a.s.gusak@urfu.ru
Antioxidant additives are required component of lubricants, because usually these materials
lifetime depends on base oil oxidation. High temperature oxidation results in peroxides, alcohols,
aldehides, ketons, acides, water etc. [1]. This leads to oxidated oil density increasing, corrosive
wastage acceleration, insoluble polymers formation, that may be observed as pulp and lacquering
residue, boiling and melting point increasing [2].
Alkilated hindered mono-, di- and polycyclic phenol derivatives are the most effective
antioxidants acting as radical acceptor and are used in many fields. Calix[n]arenes similarity with
phenol derivatives let us suggest that calixarenes might be oxidation inhibitors.
So this work aims at the synthesis of upper and lower rims modified (thia)calix[4,6,8]arenes
and studying of their antioxidating properties. It is shown that antioxidating properties depend on:
1) number of aromatic rings, 2) presence of tertbutylated derivatives on the calixarene upper rim, 3)
presence of O-alkilated derivatives and its lenght, 4) exchange of the bridged methylene groupe to
the
sulfide
one.
It’s
founded
that
lubricant
containing
49,50,51,52,53,54,55,56-
octaalkoxycalix[8]arene is the most stable to oxidation.
Literature
[1] Pillon, L.Z., Surface Activity of Petroleum Derived Lubricants. 2011, 340
[2] Манг Т., Дрезель У. Смазки. Производство, применение, свойства. Справочник. 2010, 944