Hydraulic composition for extreme cold
AssigneeTotal Marketing Services
InventorsNicolas Champagne, Eric Rapin
Life of this patent
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Abstract
The invention relates to the field of lubricants and provides a lubricating composition comprising at least one base oil, the kinematic viscosity of which measured at 40° C. does not exceed 10 mm2/s and the pour point of which does not exceed −50° C., and at least one thickener, said lubricating composition having a pour point not exceeding −55° C.
Claims25
A lubricant composition comprising:
- at least one base oil having kinematic viscosity measured at 40° C. less than or equal to 10 mm2/s and having a pour point lower than or equal to −50° C.;
- and
- at least one polyalkylene glycol (PAG) thickener comprising at least 50 weight % of butylene oxide repeat units and having kinematic viscosity measured at 100° C. according to standard ASTM D445 (2015) comprised between 50 and 500 mm2/s, said kinematic viscosity measured at 40 ° C. according to standard ASTM D445 (2015) comprised between 500 and 4500 mm2/s, and a viscosity index measured according to standard ASTM D2270 (2012) comprised between 160 and 300;
- said lubricant composition having a pour point lower than or equal to −55° C.
A method of lubricating industrial machinery at temperatures lower than −40° C. comprising contacting mechanical parts of the industrial machinery needing an industrial lubricant or hydraulic fluid to be lubricated with a lubricant composition comprising:
- a base oil having kinematic viscosity measured at 40° C. less than or equal to 10 mm2/s and having a pour point lower than or equal to −50° C.;
- and
- a polyalkylene glycol thickener comprising at least 50 weight % of butylene oxide repeat units and having kinematic viscosity measured at 100° C. according to standard ASTM D445 (2015) comprised between 50 and 500 mm2/s, kinematic viscosity measured at 40° C. according to standard ASTM D445 (2015) comprised between 500 snf 4500 mm2/s, and a viscosity index measured according to standard ASTM D2270 (2012) comprised betweeen 160 and 300said lubricant composition having a pour point lower than or equal to −55° C.
Dependencies are inferred from the claim text.