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Marine Engine Lubrication

a technology for marine engines and lubricating fluids, applied in the direction of non-fuel substance addition to fuel, liquid carbonaceous fuels, base materials, etc., can solve the problems of crack formation and propagation through the piston, and crankcase explosion

Inactive Publication Date: 2014-06-19
INFINEUM INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention uses an anhydride and an ester in a TPEO, which results in a synergistic effect. This is shown in the data provided in the patent text.

Problems solved by technology

The presence of such carbonaceous deposits on a piston surface can act as an insulating layer that can result in the formation of cracks that then propagate through the piston.
If a crack travels through the piston, hot combustion gases can enter the crankcase, possibly resulting in a crankcase explosion.
A problem in the art is to improve still further the asphaltene dispersancy performance of TPEO's that employ high saturate basestocks.

Method used

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  • Marine Engine Lubrication
  • Marine Engine Lubrication

Examples

Experimental program
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Effect test

examples

[0085]The present invention is illustrated by but in no way limited to the following examples.

Components

[0086]The following components were used:

Ester Basestocks (A1)

[0087]a polyol ester (PRIOLUBE® 3970), a trimethylolpropane ester with C8-10 fatty acids, having a viscosity of 4.4 mm2s−1 at 100° C., ex Croda Lubricants;[0088]a polymer ester (KETJENLUBE® 115), in the form of a copolymer of alpha-olefins and a dicarboxylic acid dibutylester with an average molecular weight of approximately 1400.

Basestocks (A2)

[0089]a Group I oil (XOMAPE 600) (for comparison)

[0090]a Group II oil (RLOP 600)

[0091]a Group III oil (YUBASE 8)

[0092]Commercial identifications are in parentheses.

Detergents (B)

[0093]calcium alkyl salicylate (BI 8.0)

[0094]calcium alkyl salicylate (BI 3.0)

Basicity indices are in parentheses.

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Abstract

Trunk piston marine engine lubrication comprising a major amount of (A) an oil of lubricating viscosity that comprises an oil-soluble ester basestock, or that comprises greater than 0.1 to less than 90 mass % of an oil-soluble ester basestock and, as 50 mass % or more of the remainder of the oil of lubricating viscosity, a high saturates basestock; (B) a minor amount of a metal alkyl salicylate detergent; and (C) greater than 0.1 to less than 10 mass %, of an oil-soluble polyalkenyl-substituted carboxylic acid anhydride, wherein the or at least one polyalkenyl group is derived from a polyalkene having a number average molecular weight of from 200 to 3,000. Asphaltene precipitation in the lubricant composition, caused by the presence of contaminant heavy fuel oil, is prevented or inhibited.

Description

FIELD OF THE INVENTION[0001]This invention relates to a trunk piston marine engine lubricating composition for a medium-speed four-stroke compression-ignited (diesel) marine engine and lubrication of such an engine.BACKGROUND OF THE INVENTION[0002]Marine trunk piston engines generally use Heavy Fuel Oil (‘HFO’) for offshore running. Heavy Fuel Oil is the heaviest fraction of petroleum distillate and comprises a complex mixture of molecules including up to 15% of asphaltenes, defined as the fraction of petroleum distillate that is insoluble in an excess of aliphatic hydrocarbon (e.g. heptane) but that is soluble in aromatic solvents (e.g. toluene). Asphaltenes can enter the engine lubricant as contaminants either via the cylinder or the fuel pumps and injectors, and asphaltene precipitation can then occur, manifested in ‘black paint’ or ‘black sludge’ in the engine. The presence of such carbonaceous deposits on a piston surface can act as an insulating layer that can result in the fo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M129/72C10M129/54
CPCC10M169/045C10M2203/1025C10M2203/108C10M2205/0285C10M2207/127C10M2207/129C10M2207/262C10M2207/2805C10M2207/2835C10N2020/02C10N2030/04C10N2030/78C10N2040/252C10N2020/04C10N2010/04C10M105/32C10M169/04C10M129/54C10M129/72
Inventor DODD, JAMES C.BRADLEY-SHAW, JOSHUA L.
Owner INFINEUM INT LTD
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