Lubricant compositions, their preparation and use

Details Lubricant compositions, their preparation and use Lubricant compositions, their preparation and use

C - Chemistry, Metallurgy

10

M

C10M 169/04 (2006.01)

Patent

CA 2658817

A lubricating composition that has improved air release characteristics is based on a lubricating base oil comprising an oil or mixture of oils derived from waxy hydrocarbons produced in an F-T synthesis process. The composition is substantially free of a viscoelastic fluid having a shear stress greater than 11 kPa and a viscosity greater than 30 cSt at 1000C. It is further characterized as entraining less than 1.7% air in 2 minutes and having an air release rate greater than 0.3%/min. when measured at 500C by ASTM D 3427.

Selon l'invention, une formule lubrifiante de caractéristiques de désaération améliorées est basée sur une huile de base lubrifiante comprenant une huile ou un mélange d'huiles dérivé d'hydrocarbures cireux produits au cours d'un procédé de synthèse F-T. La formule ne contient sensiblement pas de fluides viscoélastiques de contrainte de cisaillement supérieure à 11 kPa et de viscosité supérieure à 30 cSt à 100 °C. Elle est en outre caractérisée en ce qu'elle entraîne moins de 1,7 % d'air en 2 minutes et en ce qu'elle présente une vitesse de désaération supérieure à 0,3 %/min, comme mesuré à 50 °C selon ASTM D3427.

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