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Additive composition for ep greases with excellent antiwear and corrosion properties

A technology of lubricant composition and grease, applied in the direction of lubricant composition, additive, compound of elements of Group 5/15 of the periodic table, etc., can solve problems such as reducing wear and tear

Active Publication Date: 2010-11-17
VANDERBILT CHEM LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these compounds are excellent grease extreme pressure additives, their high surface affinity for metal surfaces produces coatings that cause undesirable discoloration of copper and other non-ferrous metals and block the ability of anti-wear additives to reduce wear

Method used

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  • Additive composition for ep greases with excellent antiwear and corrosion properties
  • Additive composition for ep greases with excellent antiwear and corrosion properties
  • Additive composition for ep greases with excellent antiwear and corrosion properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A poly(ether) glycol compound containing thiadiazole (Vanlube from R.T. Vanderbilt Company of Norwalk, CT) 972M Additive), Vanlube 972M and molybdenum dialkyldithiophosphate (Molyvan from R.T. Vanderbilt Company L additive), Vanlube 972M diluted with 10-20% oil with zinc dialkyldithiophosphate (Lubrizol® from Lubrizol Corp. 1395) and the combination of Vanlube 972M with MolyvanL and Lubrizol 1395 for wear, EP and corrosion properties of lithium grease. The data summarized in Table 1 show that only the greases treated with all three components and the specified concentrations had good to excellent Timken OK loads and acceptable scratch and copper corrosion ratings. Additionally, the data for Formulations 10, 11, 12 and 13 indicate that molybdenum dialkyldithiocarbamate (Molyvan 822) and organic molybdates (Molyvan 855) are not effective alternatives to MoDTP.

[0043] Table 1

[0044]

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Embodiment 2

[0050] Embodiment 2 (comparative embodiment)

[0051] As a comparative example, the ZDDP component of the present invention was replaced with other phosphoric acid and zinc based antiwear (AW) additives while keeping the other components of the present invention unchanged. As summarized in Table 2, with the exception of zinc naphthenate, none of the alternatives provided satisfactory antiwear performance. However, the EP performance of zinc naphthenate-containing compositions was not satisfactory.

[0052] Table 2 (comparative examples)

[0053]

[0054]

Embodiment 3

[0055] Embodiment 3 (comparative embodiment)

[0056] For comparison, other thiadiazole derivatives were substituted for the thiadiazole poly(ether)glycol complex components of the present invention. As summarized in Table 3, none of the alternative choices provided satisfactory EP performance:

[0057] Table 3 (comparative examples)

[0058]

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Abstract

A lubricant composition is provided as follows: At least 90% of a base grease; (a) a thiadiazole poly(ether)glycol complex in an amount which provides about 1500 to 3500 ppm sulfur; (b) molybdenum dihydrocarbyldithiophosphate in amount which provides about 77 to 450 ppm molybdenum; and (c) zinc dihydrocarbyldithiophosphate in an amount which provides about 600 to 1000 ppm zinc. An additive composition for grease, consisting of components (a), (b) and (c), is also provided.

Description

field of invention [0001] The present invention relates to additive compositions for extreme pressure ("EP") grease compositions having excellent antiwear and anticorrosion properties. More specifically, the present invention relates to additive compositions comprising (A) thiadiazole poly(ether) glycol complex, (B) molybdenum dihydrocarbyl dithiophosphate, and (C) zinc dihydrocarbyl dithiophosphate . Background of the invention [0002] EP greases lubricate under high load conditions and require high-efficiency EP additives to prevent galling and welding. Thiadiazoles are effective EP additive compounds. US Patent No. 6,365,557 discloses thiadiazole / poly(ether) glycol complexes. Although these compounds are excellent grease extreme pressure additives, their high surface affinity for metal surfaces produces coatings that cause undesirable discoloration of copper and other non-ferrous metals and block the ability of antiwear additives to reduce wear. The present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/18C10M137/00
CPCC10N2230/40C10M2223/047C10N2230/12C07F9/1651C10M2207/1256C10N2230/43C10M2207/16C10M2223/043C10N2230/06C10M2209/104C10M161/00C07D417/12C10M2223/045C10N2250/10C10M2219/106C10N2030/06C10N2030/40C10N2030/43C10N2030/12C10N2050/10C10N2010/12C10N2010/02C10N2010/04
Inventor 加斯顿·A·艾吉兰罗纳德·J·赫泽
Owner VANDERBILT CHEM LLC
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