Reduced molybdenum grease formulation
a technology of molybdenum and additive, which is applied in the direction of molybdeum compounds, lubricant compositions, chemistry apparatus and processes, etc., can solve the problems of high cost of molybdenum disulfide, the need for extreme pressure additive and grease formulation,
Inactive Publication Date: 2011-03-17
COWAN SANDRA S
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The formulation provides similar or improved extreme pressure, stability, fretting wear protection, water resistance, oxidation resistance, and Timken OK load rating while reducing the amount of molybdenum disulfide, thus lowering costs and maintaining performance.
Problems solved by technology
However, molybdenum disulfide is relatively expensive, and its availability is sometimes limited.
However, the disclosure does not specify a ratio of molybdenum disulfide to calcium carbonate.
As discussed above, there is a need for such an extreme pressure additive and grease formulation due to the cost, and limited availability.
Method used
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Experimental program
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examples
[0031]The present invention may be further illustrated in the following examples. However, it is to be understood that these examples are for illustrative purposes only and should not be used to limit the scope of the present invention in any manner.
[0032]Physical properties of a grease containing the inventive extreme pressure additive were evaluated according to the evaluation methods identified below. In a first example, the invention was compared against a commercially available grease containing 3% molybdenum disulfide. The 3% molybdenum disulfide was, in essence, replaced by the inventive extreme pressure additive so that the inventive extreme pressure addition represented 3% of the grease formulation. Table 1 tabulates the different characteristics measured for each of the two formulations.
TABLE 1Test3% FormulaInventionColorGrayGrayTextureSmooth, Smooth, adhesiveadhesiveUn-Wk Pen288290Wk-60294295Wk-1000300303D 1831 Roll Stability4.97%4.97%Drop Point (° F.)ND @ 277° C. / ND @ 27...
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Abstract
Extreme pressure additives may be added to greases to improve their lubricating properties, particularly to decrease friction and wear of parts that are exposed to very high pressures. Molybdenum disulfide is frequently used as an extreme pressure additive. However, molybdenum disulfide is expensive, has limited availability, and may have adverse environmental effects. This invention discloses an extreme pressure additive and grease formulation where the amount of molybdenum disulfide is reduced through the addition of calcium carbonate while the performance characteristics of the grease are maintained or improved. The extreme pressure additive may comprise about 20% molybdenum sulfide and about 80% calcium carbonate, by weight.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention generally relates to an extreme pressure additive for greases. More specifically, the present invention relates to an extreme pressure additive comprised of molybdenum disulfide and calcium carbonate in a selected ratio. The present invention also relates to a grease formulation containing the extreme pressure additive.[0003]2. Description of the Problem and Related Art[0004]Lubricants are substances introduced between two moving surfaces to reduce the friction and wear between them. Greases are a category of lubricants that are used when a surface can only be lubricated infrequently or a lubricating oil would not stay in position. Greases also act as sealants to prevent ingress of water and dust.[0005]Greases are prepared by incorporating a lubricating oil in a thickener. Thickeners comprising soaps are generally preferred. The lubricating oil may be one of many different types of mineral oils, wh...
Claims
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IPC IPC(8): C10M125/22
CPCC10M125/00C10M141/02C10M2201/062C10M2201/066C10M2207/126C10N2220/082C10N2250/10C10N2230/06C10N2230/40C10N2210/02C10N2020/06C10N2030/06C10N2050/10C10N2030/40C10N2010/04
Inventor COWAN, SANDRA S.
Owner COWAN SANDRA S