Synthesis and research of xanthogenic acid derivatives with different polar groups as additives to transmission oils

Derivatives of xanthogenic acids containing amine and hydroxyl groups were synthesized on the basis of epichlorohydrin. The three-component reaction of epichlorohydrin with various potassium alkylxanthogenates and a secondary amine, whereby the secondary amine was taken strictly according to the calculations, was to obtain β-hydroxy-γ-dibutylaminopropyl esters of alkylxanthogenic acids. The structure of β-hydroxy-γ-dibutylaminopropyl esters of alkylxanthogenic acids was confirmed by IR spectroscopy. Alkylxanthogenic acid derivatives have been investigated as additives for transmission oils. All derivatives had effective tribological characteristics, that is, extreme pressure and antiwear properties.An increase in the alkyl radical leads to some change in extreme pressure properties, reducing the scuffing index from 570N to 530N and the critical load from 1260N to 1190 N. The connections were tested in SN-1200 base oil and I-40A industrial oil. In both oils, they showed better efficiency than additives LZ-23k and ABES, especially in terms of antiwear properties. The study of the effect of the test duration on the antiwear properties revealed their better response over a long period of time  6 and 8 hours than the ABES additive.