Synthesis of viscosity index improver for motor lubricating oil

The viscosity of lubrication oil is the important property to evaluate the behavior of lubrication activity of oil. Viscosity index VI is the standard indicator of effecting temperature on viscosity of lubricating oil. Viscosity index improvers are the chemicals that added to base lubricating oil produced from refineries to make oil stable against temperature elevation during internal combustion engine operation. In this work, special viscosity index improver was prepared by blending of DQC (that synthesized depending on Ethylene Diamine Tetra Acetic acid original compound) with polyoxyethylene (p 20) in presence of mystelene as solvent. The prepared viscosity index improver was added to base lubricating oil grade SN-500 produced from Al – Dorah refinery with different weight ratios, adding 7.8% of viscosity index improver to SN-500 base oil improved VI by 14 degrees without effect on other properties of oil.