Marine lubricant for two-stroke engine

Details Marine lubricant for two-stroke engine Marine lubricant for two-stroke engine

C - Chemistry, Metallurgy

10

M

C10M 163/00 (2006.01) C10M 133/56 (2006.01) C10M 159/22 (2006.01) C10M 159/24 (2006.01)

Patent

CA 2320332

The invention concerns a lubricant for a two-stroke slow speed crosshead marine engine, powered with a fuel with sulphur content not less than 1 %, consisting of a mixture of distillates used as lubricating bases containing x wt.% of dispersing additive of the succinimide type, y wt.% of an overbased detergent additive of the sulphonate type, and z wt.% of an overbased detergent additive of the phenate type. The invention is characterised in that x, y and z are selected in the intervals 0.5?x?2.5, 3.5?y?10 and 11?z?24.5 such that 15?x+y+z?36 and 1.5?y/x?13, the BN of the lubricant, determined according to the ASTM D-2896 standard, is not less than 70 mg KOH/g, and the speed at which sulphuric acid is neutralised by the lubricant, defined by the maximum speed of pressure increase of a closed chamber, with its walls covered with a film of said lubricant from 80 to 100 µm thick, maintained at 100 ·C, wherein is introduced a known amount of sulphuric acid, has a value not less than 11 x 10 ?2¿ Pa/s at 100 ·C.

Lubrifiant pour moteur marin 2-temps, lent à cross, alimenté par un carburant de teneur en soufre supérieure ou égale à 1 % constitué d'un mélange de distillats utilisés comme bases lubrifiantes renfermant x % en poids d'additif dispersant de type succinimide, y % en poids d'additif détergent surbasé de type sulfonate, et z % en poids d'additif détergent surbasé de type phénate caractérisé en ce que x, y et z sont choisis dans les intervalles 0, 5x2,5, 3,5y10 et 11z24,5 de telle sorte que 15x+y+z36 et 1,5 y/x13, que le BN du lubrifiant, déterminé selon la norme ASTM D-2896, est supérieur ou égal à 70 mg de KOH/g, et que la vitesse de neutralisation par le lubrifiant de l'acide sulfurique, définie par la vitesse maximale d'augmentation de pression d'une enceinte fermée, aux parois recouvertes d'un film dudit lubrifiant de 80 à 150µm d'épaisseur, maintenue à 100 ~C, dans laquelle on introduit une quantité connue d'acide sulfurique, a une valeur supérieure ou égale à 11 x 102Pa/s à 100 ~C.

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