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Lubricating grease composition and preparation

a technology of lubricating grease and composition, applied in the direction of biocide, liquid degasification, separation process, etc., can solve the problem of the number of hours to failure of the tes

Inactive Publication Date: 2009-04-02
CHEVROU USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In one embodiment, there is provided a grease composition comprising (i) a lubricating base oil; (ii) from 2 to 50 wt % of a thickener selected from a simple soap, a complex soap, polyurea, diurea, triurea, fluorocarbon resin, and mixtures thereof, and (iii) 0-30 wt % of at least an additive selected from the group of preservatives, colorants, anti-weld agents, extreme pressure agents, flame retardants, rust inhibitors, corrosion inhibitors, oil bleed inhibitors, metal deactivators, viscosity modifiers, pour point depressants, and mixtures thereof, the lubricating base oil comprises at least 50 wt. % of a Fischer-Tropsch base oil having a total weight percent of molecules with cycloparaffinic functionality of greater than 10, and a ratio of weight percent molecules with monocycloparaffinic functionality to weight percent molecules with multicycloparaffinic functionality of greater than 15. In one embodiment, the Fischer-Tropsch base oil is a Fischer-Tropsch derived base oil. In a second embodime...

Problems solved by technology

The number of hours to failure is the test result.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0101]A base oil blend comprising 85 wt. % of FTBO-1 and 15 wt. % of FTBO-2 Fischer-Tropsch derived base oils is used as the base oil matrix for the grease composition. In addition to the base oil matrix which constitutes 50-85 wt. % of the final composition, the grease composition also comprises a polyurea thickener comprising a diisocyanate and an alkylamine in an approximate 1:2 (±0.5) to 1:3 ratio (±0.5), and 1.5 to 20 wt. % of one or more corrosion inhibitors and anti-oxidants known in the art, and optional carrier oil.

example 2

[0102]A base oil blend comprising 70-90 wt. % mixture of FTBO-2 Fischer-Tropsch derived base oil with 2-30 wt. % of polybutene is provided as the base oil matrix. In addition to the base oil matrix, the grease composition further comprises 5-30 wt. % of a polyurea thicknener comprising MDI, TDI or other diisocyanate and an alkyl amine in an approximate 1:1 (±0.) to 1:3 ratio, 0.5-10 wt. % of one or more oxidation inhibitors known in the art, 1.5 to 20 wt. % of at least a corrosion inhibitor known in the art, and optional carrier oil.

[0103]Examples 1 and 2 can be prepared as follows: A large stainless steel mixing bowl is charged with base oil (or mixtures thereof depending on the example) and heated close to 160° F. The mixer is started at a moderate rate setting, and calculated amounts of thickener additives are added and let melt first if necessary (approximately 5 to 10 minutes). The mixture is then heated slowly to not more then to 400° F., preferably in the range of 250-390° F....

examples 3-6

[0107]In these examples, the base oil is first measured and then blended in a large stainless steel mixing bowl. The oil is next heated to close to 160° F. Between 0.25-3 wt. % of a surfactant or surfactant blend is added and the mixture is stirred for 5 minutes. Between 3-15 wt % 12-Hydroxystearic can be added next. Mixture is allowed to cool gradually, then 0.5-10 wt % lithium hydroxide mono hydrate can be slowly added until well blended. The mixture is next heated slowly to 390-400° F. Temperature is held constant for 20 minutes, then mixture is allowed to cool off gradually to 180-250° F. before milling. In some examples where viscosity modifiers are used, the additives can be added last after milling, then the mixture is allowed to cool off to 180° F. Additives or additive packages used in this example may include 0.5-10 wt % extreme pressure agent(s), 0.1-5 wt % of at least a water resistance agent, 1-10 wt % of at least a viscosity modifier, 0.1-2 wt % of at least a rust inhi...

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Abstract

A grease composition is prepared from an isomerized base oil having consecutive numbers of carbon atoms and less than 10 wt % naphthenic carbon by n-d-M; a kinematic viscosity at 100° C. of less than 10 mm2 / s, and a cloud point—pour point spread of less than 25° C. The grease composition in one embodiment, exhibits improved service life, i.e., capable of performing for longer period of time of at least 50% at high temperatures / speeds and in an oxidizing environment as compared to greases containing Group II or POA base oils in the prior art.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit under 35 USC 119 of Provisional Application 60 / 975,708 filed Sep. 27, 2007. This application claims priority to and benefits from the foregoing, the disclosure of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates generally to lubricating grease compositions having improved service life.BACKGROUND[0003]Lubrication of moving parts with grease is necessary to for efficient motion of these parts. In embodiments such as wheel bearings, a necessary property of the lubricating grease is extended life, i.e., the grease must protect the bearings for long periods of time under severe conditions. One measure of this performance in wheel bearing applications is ASTM D3527-02 Life Performance test, which employs severe conditions of 25 lbs force (111N) thrust load, 1000 rpm, and 160° C. spindle temperature to induce grease deterioration and failure. The test is performed in a 20...

Claims

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Application Information

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IPC IPC(8): C10M169/02C10M169/04
CPCC10M169/02C10N2250/10C10M2205/0265C10M2205/0285C10M2205/173C10M2207/023C10M2207/1206C10M2207/1285C10M2213/0613C10M2215/064C10M2215/1026C10M2215/221C10M2219/046C10M2219/08C10M2219/084C10M2219/108C10N2210/01C10N2210/02C10N2210/04C10N2220/025C10N2220/028C10N2230/06C10N2230/74C10N2230/76C10N2240/02C10M2203/1006C10N2010/02C10N2010/04C10N2010/08C10N2030/06C10N2040/02C10N2050/10C10N2020/065C10N2020/071C10N2030/74C10N2030/76
Inventor BERRY, MICAH K.LEE, DAVID S.WALLACE, WILLIAM G.BOERSIG, THOMAS J.
Owner CHEVROU USA INC
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