Lubricating compositions with good thermal stability and...

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 141/10 (2006.01) C10M 133/06 (2006.01) C10M 133/44 (2006.01) C10M 133/56 (2006.01) C10M 135/22 (2006.01) C10M 135/36 (2006.01) C10M 137/08 (2006.01) C10M 137/10 (2006.01) C10M 145/34 (2006.01) C10M 155/02 (2006.01) C10M 161/00 (2006.01)

Patent

CA 2478603

The invention relates to a lubricating composition comprising: (a) at least one sulfur-free hydrocarbyl phosphoric acid ester or salt, (b) at least one sulfur-containing hydrocarbyl phosphoric acid or salt, (c) an organic polysulfide, (d) at least one dispersant, and (e) at least one triazole metal deactivator. The composition may also include a thiadiazole derivative. This additive combination provides good antiwear and thermal stability properties, even under severe thermal conditions. These compositions also have good demulsibility properties. The above combination of additives provides the antiwear and extreme-pressure protection necessary for automotive and industrial gear applications. These additives additionally provide this protection without adversely effecting demulsibility properties of the lubricant.

L'invention concerne une composition lubrifiante comprenant : (a) au moins un ester ou un sel d'acide phosphorique sans soufre du groupe hydrocarbyle, (b) au moins un acide phosphorique ou un sel du groupe hydrocarbyle contenant du soufre, (c) un polysulfure organique, (d) au moins un dispersant et (e) au moins un désactivateur de métaux à base de triazole. Cette composition peut également comprendre un dérivé de thiadiazole. Cette combinaison d'additifs confère des propriétés antiusure et une stabilité thermique avantageuses, y compris dans des conditions thermiques sévères. Les compositions selon l'invention présentent également de bonnes propriétés de désémulsion. Cette combinaison d'additifs confère les propriétés antiusure et les propriétés extrême-pression nécessaires aux applications d'appareillage automobile et industriel. Par ailleurs, ces additifs confèrent ces propriétés sans nuire aux propriétés de désémulsion du lubrifiant.

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