RHEOLOGICAL CHARACTERIZATION OF MINERAL OILS WITH ADDITIVES

Juliana JAVOROVA, Alexandru RADULESCU, Anelia MAZDRAKOVA, Vesislava TOTEVA, Victor ARSOV

Abstract


Viscosity index improvers moderate the sensitivity of lubricant viscosity to the temperature changes. This study explores the influence of various concentrations of the additive of this type Polybutene 30 (PIB30 )to mineral base oil AN46, by using a cone-plate rotational viscometer to assess rheological characteristics at medium to high shear rates. Results indicate typical non-Newtonian properties of the samples, i.e. pseudoplastic fluid behavior, with increasing shear rate leading to heightened shear stress and reduced viscosity. Concentration-dependent trends reveal an association between additive concentration, increased viscosity and shear stress. The investigated lubricants exhibit typical thixotropic properties.


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