Marine diesel cylinder lubricant

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 159/20 (2006.01) C10M 159/24 (2006.01)

Patent

CA 2729658

A marine diesel cylinder is lubricated using a lubricant having a total base number (TBN) of at least about 25, comprising an oil of lubricating viscosity and a metal-containing detergent component. Forty to 90 percent of the TBN derived from the metal-containing detergent component is provided by calcium detergent; 5 to 40 percent of the TBN by sodium deter-gent; and 5 to 45 percent by magnesium detergent. At least 50 weight percent of the total detergent substrate is sulfonate and less than 50 weight percent is monomeric or oligomeric substrate comprising one or more units of alkyl-substituted phenol having an alkyl group of 8 to 14 carbon atoms. The lubricant is useful when the marine diesel engine is fueled with a liquid fuel containing at least 2 ppm vanadium.

Selon linvention, un piston de moteur diesel marin est lubrifié à l'aide d'un lubrifiant ayant un indice de base (TBN) d'au moins environ 25, comprenant une huile de viscosité lubrifiante et un composant détergent contenant un métal. Quarante à 90 pour cent du TBN issu du composant détergent contenant un métal est fourni par un détergent au calcium ; 5 à 40 pour cent du TBN par un détergent au sodium ; et 5 à 45 pour cent par un détergent au magnésium. Au moins 50 pour cent en poids du substrat détergent total est de type sulfonate et moins de 50 pour cent en poids est un substrat monomère ou oligomère comprenant une ou plusieurs unités de phénol substitué par alkyle ayant un groupe alkyle de 8 à 14 atomes de carbone. Le lubrifiant est utile lorsque le moteur diesel marin est alimenté par un carburant liquide contenant au moins 2 ppm de vanadium.

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