1. Marica Dugić, Rafinerija ulja Modriča,
Republic of Srpska, Bosnia and Herzegovina
2. Branko Despotović, Rafinerija ulja Modriča a.d., Republic of Srpska, Bosnia and Herzegovina
3. Tatjana Botić, Tehnološki fakultet Univerziteta u Banjoj Luci, Republic of Srpska, Bosnia and Herzegovina
4. Pero Dugić, Republic of Srpska, Bosnia and Herzegovina
Synthetic esters represent a very important class of base fluids for lubricants with a wide range of physicochemical characteristics, which depend on the starting carboxylic acids and alcohols. The polar character of synthetic esters in relation to other base oils, gives them a great ability to dissolve additives of polar structure. However, too high a solubility can reduce the adsorption of functional additives in the area of the contact surfaces and worsen the tribological characteristics. Therefore, the formulations of modern lubricants combine the advantages of these base fluids in order to achieve a stable formulation and good tribological characteristics. Good rheological characteristics of certain synthetic esters in lubricant formulations contribute to lower participation of polymer additives. Biodegradability and higher thermal and oxidative stability, enable their use in various biodegradable hydraulic fluids and lubricating greases. The fire resistance of individual polyol esters is the most important characteristic for the formulation of fire-resistant hydraulic fluids. The new generation of polyol esters in the formulations of water-soluble metalworking agents improves the lubricating properties, and the lower volatility reduces the appearance of aerosols in the working environment. The paper describes the results of testing the formulations of industrial lubricants based on synthetic esters.