Studies on extreme pressure films — reactions of sulphurized vegetable oils and alkyl phenols with iron

Anand, O. N.; Malik, V.P.; Neemla, K.D.

doi:10.1016/0301-679x(86)90018-6

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…In recent years, global production and research focused on environmentally friendly lubricants and fluids made from renewable sources, including vegetable oils and compositions of vegetable and mineral lubricating oils, have been heavily developed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The study of specialized literature on this topic demonstrates these advancements.…”

Section: Introductionmentioning

confidence: 99%

On the Difference in the Action of Anti-Wear Additives in Hydrocarbon Oils and Vegetable Triglycerides

Mukhortov,

Zadorozhnaya,

Levanov

et al. 2023

Lubricants

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This paper examines the difference between the effects of anti-wear additives on vegetable and hydrocarbon-based oils. Knowledge of the specific influence of additives on the anti-wear properties of vegetable oils is necessary to increase the efficiency of the development of biodegradable lubricating oils. In addition, this is interesting from the point of view of clarifying the mechanism of action of AW/EP additives. The effect of non-toxic additives—adipic acid monoester and hexadecanol—on hydrocarbon hydrocracking oil and vegetable oil was compared. The comparison was carried out in rolling contact with sliding, sensitive to the separating ability of the oil. It was found that in hydrocarbon oil, the additive affects the parameters of the hydrodynamic friction regime. When adding an additive to vegetable oil, the hydrodynamic parameters do not change. The additive acts in the same way in both oils during mixed and transient modes. The obtained results are compared to available data, and an explanation of the difference is proposed based on the AW/EP mechanism of action. It is concluded that there is little chance of enhancing vegetable oil properties for hydrodynamic bearings. Search criteria for additives that effectively influence the antifriction and anti-wear properties of vegetable oils in mixed and boundary friction modes are proposed.

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Section: Introductionmentioning

confidence: 99%

On the Difference in the Action of Anti-Wear Additives in Hydrocarbon Oils and Vegetable Triglycerides

Mukhortov,

Zadorozhnaya,

Levanov

et al. 2023

Lubricants

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“…Despite the variety of lubricants and working fluids, the range of chemicals used as antiwear additives is rather limited. Methods for enhancing antiwear properties include: the introduction of various solid lubricating components into the lubricating oil, for example, [10][11][12][13][14] chemical modification of vegetable oils, for example, 15,16 and the introduction of oil-soluble antiwear components, for example. [17][18][19][20][21] The most common and versatile class of antiwear additives are zinc dialkyldithiophosphates (ZDDP).…”

Section: Introductionmentioning

confidence: 99%

Influence of the structure of a hydrocarbon radical on the antifriction properties of phosphorothionates in biodegradable lubricants

Mukhortov

Levanov

Yakunina

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The study aim is to develop methods of efficiency enhancement for the antiwear additives in the lubricants based on hydrocarbon oils. The tribological properties of triaryl and trialkyl phosphorothionates with similar hydrocarbyl groups have been compared. The testing has been carried out in the contact unit of combined rolling and sliding friction. It has been shown that trioctyl phosphorothionate is considerably superior to tribenzyl phosphorothionate and triphenyl phosphorothionate in antifriction and antiwear properties. The obtained results validate the suggestion that for a given polar group contained in an antiwear additive molecule the maximal efficiency can be achieved with sufficiently great hydrocarbonyl groups, when their structures are similar to the prevailing structure of the lubricant hydrocarbon molecules.

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“…Consider other ways to improve anti-wear properties. These include the introduction of various solid lubricant components into lubricating oil, for example [7][8][9][10][11], chemical modification of vegetable oils, for example [12,13], and the introduction of oil-soluble antiwear components, for example [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Studying the Possibility of Using Complex Esters as AW/EP Additives

Mukhortov¹,

Zadorozhnaya²,

Kandeva³

et al. 2019

Tribol. Ind.

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In this work, the possibility of using esters of organic acids as antiwear additives to lubricants has been investigated. Work has two targets. The first of these is the verification of theoretical statements about the mechanism of action of anti-wear additives. According to the authors ideas, the influence of additives on the formation and properties of a polymolecular adsorption layer is the predominant factor. These ideas are based on the general laws of liquids adsorption on the solid surface. In addition, they correspond to the properties of AW/EP additives used in modern lubricants. The second goal is to develop justified approaches to creating AW/EP additives for biodegradable lubricants based on vegetable oils and synthetic esters. Additives to these materials must meet several requirements. In particular, they must be chemically compatible with vegetable oils and not have bactericidal properties. For use in twostroke internal combustion engines, additives must contain a minimum amount of sulfur, phosphorus and ash elements. Esters of dibasic and tribasic organic acids with higher alcohols were chosen as promising objects of study. Studies have been conducted on the example of the monoester of maleic acid, esters of tartaric and aconitic acids with hexadecyl alcohol. The results of measurements of the anti-wear properties of these substances when added to vegetable oil are given. As a result of these tests, a high AW/EP effectiveness of aconitic ester was found. This compound also showed efficacy when it was added to petroleum oil without additives and to standard gear oil. The measurements were simultaneously carried out in the SUSU laboratories, and at Sofia University in several stands under various friction conditions. The results showed that the use of new additives in hydrocarbon petroleum oil without additives gives AW effect, which is slightly lower than ZDDP. The investigated additive can be used in standard compositions of additives to motor and transmission oils. The results of the study indicate the prospects for the use of esters of polyatomic acids as AW/EP additives for lubricants of various origins.

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Studies on extreme pressure films — reactions of sulphurized vegetable oils and alkyl phenols with iron

Cited by 12 publications

References 11 publications

On the Difference in the Action of Anti-Wear Additives in Hydrocarbon Oils and Vegetable Triglycerides

On the Difference in the Action of Anti-Wear Additives in Hydrocarbon Oils and Vegetable Triglycerides

Influence of the structure of a hydrocarbon radical on the antifriction properties of phosphorothionates in biodegradable lubricants

Studying the Possibility of Using Complex Esters as AW/EP Additives

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