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Lubricant composition for preventing pre-ignition

a technology of lubricant composition and pre-ignition, which is applied in the field of lubricants, can solve the problems of entail a complex and difficult phenomenon to predict, and lubricant compositions which show a reduction in lspi, so as to achieve satisfactory stability

Inactive Publication Date: 2022-04-21
TOTALENERGIES ONETECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a lubricant composition that includes at least one dithiocarbamate compound. The use of this compound has been found to improve the ignition temperature of the lubricant and prevent preignition, particularly low-speed preignition, during its use in an engine. Additionally, the dithiocarbamate compound's content in the composition should not exceed 1% by weight to ensure stability on storage. This patent aims to provide an effective and stable lubricant composition that prevents preignition and reduces the need for lubricant replacement during oil changes.

Problems solved by technology

Thus, this phenomenon proves to be very complex and difficult to predict.
However, these light organic compounds might entail an excessive increase in the volatility of the lubricant.
In particular, it has already been demonstrated that lubricant compositions which show a reduction in LSPI when they are fresh suffer degradation of their properties when they are spent, notably in the document “Low-speed preignition”, Engine Technology International, September 2018.
Finally, the solutions recommended in the prior art for fresh lubricant compositions prove to be insufficient in the case of spent compositions.
However, said document does not in any way suggest any effect of this combination, or of one of the additives taken in isolation, on the preignition that may arise in the engine.
However, said document does not at all mention a particular content of dithiocarbamate compound nor its specific value for preventing the preignition which takes place in engines.
As stated above, preignition has a tendency to become worse in the course of use of a lubricant composition, which is thus really efficient only when it is fresh.

Method used

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  • Lubricant composition for preventing pre-ignition
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  • Lubricant composition for preventing pre-ignition

Examples

Experimental program
Comparison scheme
Effect test

example 1

on of the Lubricant Compositions

[0213]The lubricant compositions A0 to A4 were prepared.

[0214]Their kinematic viscosity at 100° C. was determined according to the standard ISO 3104 and their properties in terms of predisposition to self-ignition were measured.

[0215]The details of the compositions are presented in Table 2 below, in which the proportions of the various compounds are indicated as mass percentages.

TABLE 2CompositionA0A1A2A3A4Base oil Group III / IV72.872.372.672.771.8Additive package*16.716.716.716.716.7Viscosity index enhancer of10.510.510.510.510.5hydrogenated styrene / isoprenecopolymer typeMoDTC (Sakuralube ® 525 from00.50.20.10Adeka)mDTC (Vanlube ® 7723 from00001Vanderbilt)KV100 (mm2 / s)11.5211.4611.5111.4711.46*The additive package is a mixture of different additives that are common in the field of lubricants and commercially available. It comprises wear-resistance additives of zinc dithiophosphate type, detergents based on calcium and magnesium, and dispersants of PIB...

example 2

n of the LSPI Performance of the Lubricant Compositions

[0219]The exothermic reaction initiation temperature (ignition temperature) was measured for each of the lubricant compositions of Example 1, according to the measurement method (laboratory preignition tendency method) defined above.

[0220]The results are given in Table 3 below.

TABLE 3CompositionIgnition temperature [° C.]A0 (Reference)196A1 (Invention)210A2 (Invention)211A3 (Invention)210A4 (Invention)214

[0221]Compositions A1 to A4 according to the invention, comprising molybdenum dithiocarbamate or methylene bis(dibutyldithiocarbamate), have higher ignition temperatures than for the same composition not comprising any dithiocarbamate compound required according to the invention (reference composition A0).

[0222]These measurements thus make it possible to demonstrate that the addition of at least one dithiocarbamate compound to an aged lubricant composition makes it possible to significantly retard preignition, in particular LSPI...

example 3

on of the Lubricant Compositions

[0226]The lubricant compositions B0 to B7 were prepared.

[0227]In particular, composition B0 is outside the invention since it comprises a content of dithiocarbamate compound of greater than 1% by weight.

[0228]Compositions B1 to B7 are in accordance with the invention.

[0229]Their kinematic viscosity at 100° C. was determined according to the standard ISO 3104.

[0230]The details of the compositions are presented in Table 5 below, in which the proportions of the various compounds are indicated as mass percentages.

TABLE 5CompositionB0B1B2B3B4B5B6B7Base oil71.372.372.672.772.72572.7572.77572.79Group III / IVAdditive15.715.715.715.715.715.715.715.7package*Viscosity index10.510.510.510.510.510.510.510.5enhancer ofhydrogenatedstyrene / isoprenecopolymer typeDiphenylamine0.80.80.80.80.80.80.80.8antioxidant(Irganox ® L-57)Polymethacrylate0.20.20.20.20.20.20.20.2MoDTC1.50.50.20.10.0750.050.0250.01(Sakuralube ®525 from Adeka)KV100 (mm2 / s)11.7711.4611.5111.4811.4811.48...

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Abstract

The present invention relates to the use of a lubricant composition comprising (i) at least one dithiocarbamate compound; and (ii) at least one base oil, for preventing and / or reducing pre-ignition, in particular at low speed, in a vehicle engine, wherein said composition is applied during at least one change interval without the addition of a new lubricant composition, the content of dithiocarbamate compound being less than or equal to 1% by weight relative to the total weight of the lubricant composition.

Description

TECHNICAL FIELD[0001]The present invention relates to the field of lubricants, which may notably be used in vehicle engines, in particular lubricant compositions for preventing or reducing preignition in an engine.[0002]Under ideal conditions, normal combustion in a spark ignition engine takes place when a mixture of combustible, and notably of fuel and air, is ignited in the combustion chamber inside the cylinder via the production of a spark coming from a spark plug. Such normal combustion is generally characterized by the expansion of the flame front through the combustion chamber in an ordered and controlled manner.[0003]However, in certain cases, the air / fuel mixture may be prematurely ignited by a lighting source before the ignition by the spark from the spark plug, which leads to a phenomenon known as preignition.[0004]Now, it is preferable to reduce or even eliminate preignition since this is generally reflected by the presence of a large increase in the temperatures and pre...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10M143/14C10M135/18C10M133/12C10M141/08C10M161/00
CPCC10M169/044C10M143/14C10M135/18C10M133/12C10M141/08C10N2040/25C10M2203/003C10M2219/068C10M2205/08C10M2215/26C10M161/00C10M2219/066C10M2203/1025C10M2205/04C10M2223/045C10M2205/0285C10M2215/28C10M2215/064C10M2207/026C10M2207/289C10N2030/02C10N2010/04C10N2040/255C10N2010/12C10N2020/02C10M2205/06C10N2060/02C10N2030/04C10N2030/10
Inventor FAURE, STEVEPAPIN, GÉRALDINE
Owner TOTALENERGIES ONETECH