Additives based on dithiophosphoric acids and unsaturated compounds for lubricating oils

Borshchevskii, S. B.; Levitina, I. S.; Шабанова, Е. В.; Kotova, G. G.

doi:10.1007/bf00719000

Cited by 5 publications

(4 citation statements)

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“…simple alkenes C n H 2n ). The authors attributed this to the higher nucleophile strength of functionalised alkenes [44]. More recently, Sharma et al ascribed this to the stronger adsorptive power of functionalised dithiophosphate derivatives on steel surfaces [45].…”

Section: Ashless P/s-based Additivesmentioning

confidence: 99%

Tribofilm Formation, Friction and Wear-Reducing Properties of Some Phosphorus-Containing Antiwear Additives

Luiz

Spikes

2020

Tribol Lett

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The film-forming, friction and wear properties of a range of model and commercial ashless P and P/S antiwear additives have been studied. A method has been developed for removing the tribofilms formed by such additives in order to effectively quantify mild wear. In general the P/S additives studied formed thinner tribofilms but gave lower wear than the S-free P ones. In extended wear tests, three P/S additives gave wear as low, or lower, than a primary zinc dialkyldithiophosphate (ZDDP). For almost all lubricants tested the wear rate measured in short tests was considerably higher than that in long tests due to the greater contribution of running-in wear in the former. This highlights the importance of basing antiwear additive choice on reasonably long tests, where running-in becomes only a small component of the wear measured. It has been found that for both P and P/S ashless additives the addition of oil-soluble metal compounds based on Ti and Ca boosts tribofilm formation and can lead to very thick films, comparable to those formed by ZDDP. However, this thick film formation tends to be accompanied by an increase in mixed friction and also does not appear to reduce wear but may even increase it.

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Section: Ashless P/s-based Additivesmentioning

confidence: 99%

Tribofilm Formation, Friction and Wear-Reducing Properties of Some Phosphorus-Containing Antiwear Additives

Luiz

Spikes

2020

Tribol Lett

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“…A common class of ashless additives can be prepared by the addition of amines to an appropriate thiophosphoyl chloride to form the amidothiophosphate [55]. Other additives can be prepared by the addition of the sulfur atom across the double bond of acrylic acid or an acrylate ester, among other possibilities [56]. An alternate approach relies on hydrogen peroxide to oxidize and dimerize the dialkylthiophosphate [57].…”

Section: Dithiophosphate Ester and Phosphorothionate Ester Additivesmentioning

confidence: 99%

Phosphate Esters, Thiophosphate Esters and Metal Thiophosphates as Lubricant Additives

Johnson

Hils

2013

Lubricants

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Phosphate esters, thiophosphate esters and metal thiophosphates have been used as lubricant additives for over 50 years. While their use has been extensive, a detailed knowledge of how they work has been a much more recent development. In this paper, the use of phosphate esters and thiophosphate esters as anti-wear or extreme pressure additives is reviewed with an emphasis on their mechanism of action. The review includes the use of alkyl phosphates, triaryl phosphates and metal containing thiophosphate esters. The mechanisms of these materials interacting with a range of iron and steel based bearing material are examined.

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“…They are prepared by the addition of amines to an appropriate thiophosphoryl chloride [46]. Other additives are prepared by the addition of sulfur across the double bond of acrylic acid or an acrylate ester [47]. An alternate approach is to use hydrogen peroxide to oxidize and then dimerize the alkyldithiophosphate [48].…”

Section: Dithiophosphate Esters and Related Materialsmentioning

confidence: 99%

The Tribology and Chemistry of Phosphorus‐Containing Lubricant Additives

Johnson¹

2016

Advances in Tribology

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Phosphate esters, thiophosphate esters and metal thiophosphates have been used as lubricant additives for over 50 years. Recently, phosphorus-containing ionic liquids have emerged as a new class of lubricant additives. While the use of phosphorus compounds has been extensive, a detailed knowledge of how they work has been a much more recent development. In this chapter, the use of phosphate esters, thiophosphate esters, metal thiophosphates and phosphorus-containing ionic liquids as antiwear or extreme pressure additives is discussed. The primary emphasis will be on how they form a protective film, which is both durable and reduces friction. The first part of the chapter discusses the use of alkyl phosphates, triaryl phosphates and metal-containing thiophosphate esters with primarily iron-and steel-based bearing materials. The second part of the chapter examines phosphorus-containing ionic liquids and the challenges posed by new bearing materials with different surface chemistries.

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Additives based on dithiophosphoric acids and unsaturated compounds for lubricating oils

Cited by 5 publications

References 0 publications

Tribofilm Formation, Friction and Wear-Reducing Properties of Some Phosphorus-Containing Antiwear Additives

Tribofilm Formation, Friction and Wear-Reducing Properties of Some Phosphorus-Containing Antiwear Additives

Phosphate Esters, Thiophosphate Esters and Metal Thiophosphates as Lubricant Additives

The Tribology and Chemistry of Phosphorus‐Containing Lubricant Additives

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