INFLUENCE OF POLYISOPRENE ADDITIVES ON THE VISCOSITY OF BASE LUBRICATING OILS

The object of this research is to fined additives for oil base stocks which have the ability to raise its viscosity. Three polymers (polyisoprene 1502, 1320, Butile) where selected for that purpose. The three type of
polyisoprene have been used and succeeded to raise the viscosity and the best of which was polyisoprene type 1320. Measurement were made of the dynamic viscosities of three types of base lube oil stocks with a wide range of API gravities (20.65-34.97) with additives (polyisoprene (1502, 1320, Butile) at different temperatures in the range of 298 to 393 K. A model was used to estimate the dynamic viscosity of oil-stocks with additives at different temperatures for binary mixtures. The method is based upon concentration (WT %) of the additive, as follows: