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Low sediment friction modifiers

Inactive Publication Date: 2005-06-09
CHEMTURA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The additive mixture provides a lubricant oil composition having improved lubricity and exhibits less sedimentation.

Problems solved by technology

However, a common problem which occurs when aging the lubricant oil is the formation of sediment.
In a storage tank containing many thousands of gallons of lubricant oil fluid, a sedimentation rate of a few percent can correspond to a thousand or more gallons of bottom sediment, which is clearly undesirable.

Method used

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  • Low sediment friction modifiers
  • Low sediment friction modifiers

Examples

Experimental program
Comparison scheme
Effect test

examples 1-8

[0027] These examples are directed to a study of the sedimentation characteristics of various blends of overbased calcium sulfonate and selected friction modifiers. Two types of overbased calcium sulfonates were individually tested. Calcinate™ C300CS is a crystalline overbased calcium sulfonate having TBN of about 300 and a particle size of from about 50 nm to about 100 nm, and is available from Crompton Corporation. Calcinate™ C400CLR is an amorphous overbased calcium sulfonate available from Crompton Corporation having TBN of about 400 and a particle size of no more than about 30 nm. Overbased calcium sulfonates were present in 10% concentrations. The friction modifier included glycerol mono oleate (“GMO”). Polyisobutylene succinic anhydride (“PIBSA”) having a molecular weight of about 1,050, was present in Examples 3, 4, and 7 as a dispersant. The friction modifier was present in 1% concentrations when employed. The lubricant oil stock was a severely hydrotreated naphthenic oil a...

examples 9 to 16

[0030] Sedimentation experiments were conducted in the same manner as in Examples 1-8 except that the friction modifiers tested were an oxidized petroleum fraction available under the designation Alox 165L from Lubrizol, an overbased calcium oleate, designated herein as “OCO”, and GMO. The friction modifiers, when employed, were each present in 0.5% concentration. Examples 10 and 14 did not employ any friction modifiers.

[0031] As can been seen from the results the amorphous overbased calcium sulfonate Calcinate™ C400CLR (Examples 13-16) was characterized by very low sedimentation percentages (typically about 0.001 to about 0.005) as opposed to the sedimentation percentages (0.11 to 0.50) for the Calcinate™ C300CS (Examples 9-12).

[0032] The results of these experiments are set forth in Table 2.

TABLE 2Example910111213141516C300CS 10% 10% 10% 10%————C400CLR———— 10% 10% 10% 10%Alox 16520.5%———0.5%———OCO——0.5%———0.5%—GMO———0.5%———0.5%Hyprene H10089.5% 9089.589.589.59089.589.5% Sedime...

examples 17 to 28

[0033] Sedimentation experiments were conducted in a manner similar to Examples 9 to 16, except that the friction modifiers tested were OCO (overbased calcium oleate), Alox 302 (oxygenated petroleum fraction), an overbased barium tallate having 3% -10% barium and designated herein as “OBT”, an overbased calcium tallate having 4%-10% calcium and designated herein as “OCT”, and GMO (glycerol mono oleate). Examples 22 and 28 did not employ any friction modifier.

[0034] As can be seen, the amorphous overbased calcium sulfonate Calcinate™ C400CLR (Example 23-28) is characterized by much lower percentages of sedimentation as opposed to the sedimentation percentages for the crystalline overbased calcium sulfonate Calcinate™ C300CS (Examples 17-22).

[0035] The results of these experiments are set forth in Table 3

TABLE 3Example171819202122232425262728C300CS 10% 10% 10% 10% 10% 10%——————C400CLR—————— 10% 10% 10% 10% 10% 10%OCO0.5%—————0.5%—————Alox 302—0.5%—————0.5%————OBT——0.5%—————0.5%———...

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Abstract

An additive mixture for lubricant oils includes an overbased alkaline earth metal sulfonate, and at least one friction modifier selected from the group consisting of an overbased alkaline earth carboxylate, the reaction product of an alkanolamine with a fatty acid or a fatty acid ester and the reaction product of thiodiglycol or a dialkylene glycol with a fatty acid or a fatty acid ester. The additive mixture, when combined with a lubricant stock, provides a lubricant composition characterized by less sedimentation during storage.

Description

BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] The present invention relates to friction modifiers for lubricant oils used, for example, in engines for motorized vehicles. [0003] 2. Description of the Related Art [0004] Friction modifiers for enhancing the lubricity of lubricant oils are known. Typical friction modifiers include esters of glycerol and fatty acids, overbased carboxylates, and oxidized petroleum fractions. Also known is the use of detergent additives such as overbased calcium sulfonates. However, a common problem which occurs when aging the lubricant oil is the formation of sediment. [0005] During storage, especially under warm temperature conditions, sedimentation occurs in stocks of lubricant oils containing friction modifiers and detergent additive. In a storage tank containing many thousands of gallons of lubricant oil fluid, a sedimentation rate of a few percent can correspond to a thousand or more gallons of bottom sediment, which is clearly undesi...

Claims

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Application Information

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IPC IPC(8): C10M163/00
CPCC10M163/00C10N2260/04C10M2203/1065C10M2207/123C10M2207/129C10M2207/26C10M2207/283C10M2207/289C10M2215/042C10M2219/046C10M2219/084C10M2219/085C10N2210/02C10N2220/082C10N2230/06C10N2230/52C10M2203/10C10N2020/06C10N2030/52C10N2030/06C10N2010/04C10N2060/04
Inventor COSTELLO, MICHAEL T.RIFF, IGORWEAVER, JOSEPH A. JR.
Owner CHEMTURA CORP
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