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Nanosized particles of molybdenum sulfide and derivatives,method for its preparation and uses thereof as lubricant additive

a technology of molybdenum sulfide and molybdenum sulfide, which is applied in the field of nanoparticles of molybdenum sulfide, can solve the problems of phosphorus limiting the service life of catalytic converters, ash forming in dialkyldithiophosphates, and poor solubility of molybdenum compounds in lubricant oils, so as to prevent the coagulation of nanop

Inactive Publication Date: 2005-03-24
CROMPTON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The additives of the present invention are complex reaction products prepared in a series of reactions. The additives are molybdenum sulfide nanosized particles [MoSx] whose surfaces are modified with one or more appropriate ligands to prevent the coagulation of the nanoparticles and provide solubility and stability therefor in hydrocarbons or similar solvents.

Problems solved by technology

However, zinc dialkyldithiophosphates give rise to ash, which contributes to particulate matter in automotive exhaust emissions.
In addition, the phosphorus is also suspected of limiting the service life of catalytic converters, used on cars to reduce pollution.
Unfortunately, a problem remains in that many molybdenum compounds exhibit poor solubility in lubricant oils.

Method used

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  • Nanosized particles of molybdenum sulfide and derivatives,method for its preparation and uses thereof as lubricant additive
  • Nanosized particles of molybdenum sulfide and derivatives,method for its preparation and uses thereof as lubricant additive
  • Nanosized particles of molybdenum sulfide and derivatives,method for its preparation and uses thereof as lubricant additive

Examples

Experimental program
Comparison scheme
Effect test

example 1

Isopropyloctadecylamine (IPODA)

Cetyltrimethylammonium bromide (0.652 g) was dissolved in 45 mL of chloroform and 100 μL of a saturated aqueous solution of (NH4)6Mo7O24.2H2O was added with stirring. The opaque solution was heated, then 20 mL of isooctane and 20 mL of chloroform were added, and 10 drops of concentrated aqueous HCl solution, resulting in a clear solution. Excess H2S was bubbled in until a weak yellow color was obtained, then 11 mL of a solution obtained by dissolving 0.577 g of isopropyloctadecylamine in 50 mL of chloroform (Mo:N˜1:5) was added. Three days later, all solvents were evaporated from the resulting dark solution containing small sediment, the residue was stirred with 30 mL tetrahydrofuran (THF), undissolved cetyltrimethylammonium bromide (CTAB) containing some MoS3 was filtered off, and the resulted dark clear solution was evaporated.

example 2

sec.-Butylamine

CTAB (0.757 g) was dissolved in 100 mL of chloroform and diluted with 100 mL of hexane. One hundred mL of saturated aqueous solution of (N4)6Mo7O24.2H2O was added with stirring, followed by 12 μL of concentrated aqueous HCl solution, which resulted in a clear solution. H2S was bubbled in over a one hour period until the color became gray-brown, then 30 μL of sec.-butylamine was added, whereupon the solution became a deep brown. Twenty-four hours later, all the solvents were evaporated from the dark solution, the residue was stirred with 15 mL of tetrahydrofuran (THF), undissolved CTAB containing some MoS3 was filtered off, and the resulting dark clear solution was evaporated to yield 0.1279 g of a dark substance.

example 3

Alkenyl Succinimide

Alkenyl succinimide (ASI, 1.7 mL) (the reaction product of Indapol H-1500 (polyisobutylene) with maleic anhydride, which is then reacted with triethylenetetraamine (TETA), (Uniroyal Chemical Company) solution (0.2185 g ASI in 5 mL chloroform) was dissolved in 100 mL of a 0.01M solution of CTAB in chloroform-hexane solution (1:1 v / v) with stirring. After 10 minutes, 0.05 mL of a saturated aqueous solution of (NH4)6Mo7O24 was added to produce an opaque microemulsion (ASI:Mo=1.6:1.1 by moles). Addition of approximately 8.5 μL of concentrated aqueous HCl resulted in a clear solution, into which excess H2S was bubbled. The color of the solution changed from green to brown and, after 24 hours, a brown precipitate formed. Organic solvents were evaporated under vacuum, the residue was stirred with 15 mL of freshly distilled THF, the undissolved matter was filtered off, and the THF was evaporated. The resulting residual brown substance (0.0523 g) was nanosized molybdenum...

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Abstract

A lubricant composition is disclosed that comprises: (a) a lubricant and (b) at least one molybdenum-containing compound in the form of surface-capped nanosized particles of the general formula: (Z)n(X—R)m wherein Z is an inorganic moiety comprising molybdenum and sulfur in the form of particles having dimensions in the range of from about 1 to about 100 nm; (X—R) is a surface-capping reagent wherein R is a C4 to C20 straight or branched-chain alkyl or alkylated cycloalkyl radical or radicals and X is a functional group capable of specific sorption and / or chemical interaction with molybdenum / sulfur moiety; n is the number of molecules of Z in the particles; m is an integer representing the amount of surface-capping reagents relative to a single particle; and the ratio of m to n is in the range of from about 1:1 to about 10:1.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to organo molybdenum derivatives and their use as multifunctional friction modifier, antiwear, extreme pressure, antioxidant additives for lubricants. 2. Description of Related Art Regulatory agencies today are seeking to improve the fuel economy of cars on the road through legislation (CAFE requirements) putting this responsibility on the car manufacturers who, in turn, transfer some of this responsibility to the lubricant oil manufacturers via engine oil specifications. It can be seen that as these fuel economy requirements become more stringent, friction modifier additives become more important to incorporate into lubricant compositions. It is an object of this invention to provide a friction modifier additive that imparts a reduction in the coefficient of friction to a lubricant composition. In addition, zinc dialkyldithiophosphates (ZDDP) have been used in formulated oils as anti-wear and antioxid...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M159/18C10M171/06
CPCC10M171/06C10M159/18
Inventor MIGDAL, CYRIL ASTOTT, PAUL EBAKUNIN, VICTOR NPARENAGO, OLEG PKUZ'MINA, GALINA NVEDENEEVA, LUDMILA MSUSLOV, ANDREI YU
Owner CROMPTON CORP
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