Author(s):
1. Branka Kojić-Dugić, Rafinerija ulja Modriča, Republic of Srpska, Bosnia and Herzegovina
2. Pero Dugić, Republic of Srpska, Bosnia and Herzegovina
3. Tatjana Botić, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. Branko Despotović, Rafinerija ulja Modriča, Republic of Srpska, Bosnia and Herzegovina
5. Tatjana Mirkovic, Republic of Srpska, Bosnia and Herzegovina
6. Mirko Petković, Rafinerija ulja Modriča, Republic of Srpska, Bosnia and Herzegovina

Abstract:
In order to extend the life of lubricants and meet the application’s performance requirements, more and more hydrocracked base oils and synthetic hydrocarbons are incorporated into the formulated final products. Although these base oil are characterized by good oxidative stability, it is still necessary to incorporate different types of oxidation inhibitors into the final formulation. Molecular oxigen, elevated temperature, catalytic action of metals and often the presence of water are the main causes of irreversible process of degradation of hydrocarbon base oils and loses of basic functional properties of lubricants. At the beginning oxidation goes slow, with different lenghts of the induction period. Then there is an increase in speed, with the accumulation of peroxide, and then again speed decrease, which is often accompained by the separation of insoluble high molecular weight products from solution. The induction period represents one of the most important criteria for evaluation of antioxidant potential and predicting the life of the formulated product. In this paper are presented results of monitoring the oxidation kintetics of hydrocracked base oils and evaluating the efectiveness of typical oxidation inhibitors by the standard method ASTM D 2272

Key words:
Lubricants, base oils, oxidative stability, induction period, antioxidants

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
29.07.2021.

Conference:
Contemporary Materials 2021 - Savremeni materijali

Applied paper from author