Formulation approach to extend the high temperature performance of lithium complex greases
OwnerJohn K. GRAHAM, Nabila BRABEZ +3inventors
InventorsJohn K. GRAHAM, Nabila BRABEZ, John ZACHARKOW, Raymond C. ENNIS, James E. SPAGNOLI
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Abstract
The present disclosure provides a lithium complex grease with high-temperature resistivity and a method of using the same. The lithium complex grease includes: a lithium complex thickener, a friction modifier, a polymer or copolymer, and at least one synthetic base oil with alkylated naphthalene. The lithium complex grease can be substantially free of polytetrafluoroethylene. Furthermore, the lithium complex grease provides a median failure rate via a ball bearing test (e.g., using the FE9 grease life test method of DIN 51 821) performed at 160° C. of no less than 100 hours.
Claims29
A lithium complex grease with high-temperature resistivity comprising:
- a lithium complex thickener;
- a friction modifier;
- a polymer or copolymer;
- and
- at least one synthetic base oil including alkylated naphthalene;
- wherein the lithium complex grease has a median failure rate with a ball bearing test performed at 160° C. (FE9 grease life test method of DIN 51 821) of no less than 100 hours.
A method of improving high-temperature resistivity of a lithium complex grease used to lubricate a ball bearing, the method comprising:
- lubricating a ball bearing with a lithium complex grease comprising:
- a major amount of at least one synthetic base oil, wherein the at least one synthetic base oil includes alkylated naphthalene;
- a minor amount of a lithium complex thickener;
- a minor amount of a friction modifier;
- a minor amount of a polymer or copolymer;
- and the remainder of the lithium complex grease comprising one or more other grease additives;
- and
- measuring the high-temperature resistivity of the lithium complex grease with a ball bearing test performed at 160° C. (FE9 grease life test method of DIN 51 821), wherein the lithium complex grease has a median failure rate in the ball bearing test of no less than 100 hours.
A lithium complex grease comprising:
- a major amount of at least one synthetic base oil, wherein the at least one synthetic base oil includes alkylated naphthalene;
- a minor amount of a lithium complex thickener;
- a minor amount of a friction modifier;
- a minor amount of a polymer or copolymer;
- and
- the remainder of the lithium complex grease comprising one or more other grease additives;
- wherein the lithium complex grease has a median failure rate with a ball bearing test performed at 160° C. (FE9 grease life test method of DIN 51 821) of no less than 100 hours.
Dependencies are inferred from the claim text.