Lubricating composition for industrial gear fluids
AssigneeAfton Chemical Corporation
InventorsDavid Edwards, Helen Ryan
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Abstract
A gear fluid composition for lubricating a driveline including a combination of short-chain polysulfide and long-chain polysulfide extreme pressure agents to minimize sulfur loss and to maintain high extreme pressure performance.
Claims20
A lubricant composition comprising:
- a) a first polysulfide extreme pressure agent comprising a mixture of C2-C6 polysulfides including a majority of trisulfides, wherein the first polysulfide has a structure of the formula R1—SX—R2, wherein R1 and R2, are independently, a C2 to C6 hydrocarbyl group and x is an integer of at least 2 with a majority of x being 3;
- b) a second polysulfide extreme pressure agent comprising a mixture of C10-C14 polysulfides including a majority of trisulfides, wherein the second polysulfide has a structure of the formula R3—SX—R4, wherein R3 and R4, are independently, a C10 to C14 hydrocarbyl group and y is an integer of at least 2 with a majority of y being 3;
- and
- wherein a weight ratio of sulfur contributed by the first polysulfide and the second polysulfide is about 0.3 to about 0.8.
A method of lubricating a driveline, the method comprising lubricating a driveline component with a lubricating composition including a first polysulfide extreme pressure agent comprising a mixture of C2-C6 polysulfides with a majority of trisulfides wherein the first polysulfide has a structure of the formula R1—SX—R2, wherein R1 and R2, are independently, a C2 to C6 hydrocarbyl group and x is an integer of at least 2 with a majority of x being 3, and a second polysulfide extreme pressure agent comprising a mixture of C10-C14 polysulfides with a majority of trisulfides, wherein the second polysulfide has a structure of the formula R3—Sy—R4, wherein R3 and R4, are independently, a C10 to C14 hydrocarbyl group and y is an integer of at least 2 with a majority of y being 3, and wherein a weight ratio of sulfur contributed by the first polysulfide and the second polysulfide is about 0.3 to about 0.8.
Dependencies are inferred from the claim text.