The increasing power and harsh operating conditions of modern gasoline and diesel engines place increasing demands on the quality of modern motor oils. To ensure long-term and reliable operation of vehicles, the purchase and production of high-quality oils is increasing.  Modern equipment cannot function without high-quality engine oils. Improving the quality of engine oils with effective additives is one of the most modern and promising methods.  Scientific and technical progress in engine production is closely related to the development of high-quality lubricants that meet the requirements of modern and advanced technology.   Only base oils with additives with different functional properties can have a wide range of performance characteristics, since base oils, regardless of their production and refining methods, do not meet all requirements. The most commonly used additives are alkylphenolate additives. Alkylphenolate additives have multifunctional properties and are one of the main components of motor oils. Therefore, the synthesis of high-quality alkylphenolate additives, the organization of their production and the creation of high-quality motor oils are among the most pressing problems of the petrochemical industry. In this regard, a new calcium salt of the condensation product of dodecylphenol, formaldehyde and sodium disulfide - AKI-55 additive was obtained. The structure of the additive was confirmed by IR spectroscopy and its physicochemical and functional properties were studied using standard methods. Compared to the production of industrially produced sulfur-containing alkylphenolates TsIATIM-339, VNIINP-714 and OLOA-218A, the method of obtaining the AKI-55 additive is simple and environmentally friendly. It has been shown that the functional properties of the AKI-55 additive are superior to its analogues and as an inhibitor it stops the oxidation chain of cumene.

doi.org/10.32737/0005-2531-2026-2-138-144