تصنيع شحم تزليق ليتيومي ودراسة خواصه الفيزيا – كيميائية وسلوكه الريولوجي

We manufactured lithium lubricant grease from Syrian base Oil, we used sunflower oil (repeated frying Oil) and soap it with base oil in two way (Prior and Immediately) to form grease with different rates (20, 25, and 30%). We studied some of the physical – chemical Properties to varieties of grease then we Compared it with Syrian standard specification 781/2008. We used in this research standard method to identify the formula of the grease, number of penetration, Dropping point, total free acid, water resistance and evaporation class at 90 ˚C. The results in this research, suggest that the best type of grease is (30% Soap). In This study the rheological Properties of lithium Lubricants were Studied using a Capillary rheometer, and the necessary corrections were performed. The results showed that the material is a pseudo Plastic in behavior and the real Viscosity (ηc) decreases with increasing real Shear rate (γc). Also we determined the flow activation energy (Eτ) at constant Shear stress by studying the relationship between real viscosity (ηc) and (1/T). It was found that the flow activation energy increases with increasing shear stress, also it was found that the flow activation energy of Immediately lithium Lubricants 30% is higher than that of Prior lithium Lubricants 30% which confirms Immediately lithium Lubricants 30% is more sensitive to temperature. So it is the best in terms of rheological characteristics.