Method for improving the coking resistance of a lubricating composition

a technology of lubricating composition and coking resistance, which is applied in the field of lubricating compositions, can solve the problems of thermal resistance and coking resistance, the defect of lubricating the roller bearing of the turbine of the engine, and the high reduction of the flow rate of oil circulation, so as to achieve quick test consumption and high thermal stability

a technology of lubricating composition and coking resistance, which is applied in the field of lubricating compositions, can solve the problems of thermal resistance and coking resistance, the defect of lubricating the roller bearing of the turbine of the engine, and the high reduction of the flow rate of oil circulation, so as to achieve quick test consumption and high thermal stability

US20170321142A1Inactive Publication Date: 2017-11-09NYCO CO LTD
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  • Method for improving the coking resistance of a lubricating composition
  • Method for improving the coking resistance of a lubricating composition
  • Method for improving the coking resistance of a lubricating composition

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[0194]The applicant has shown by the following experimental testings that a precise combination of anions and cations as well as of their substituents make it possible to form an ionic liquid or a mixture of ionic liquids having an excellent resistance to coking for thin films.

[0195]The applicant has also tested the ionic liquids disclosed in the prior art cited further up. In a surprising manner, it has been stated that most of the ionic liquids as thin films degrade very quickly as the tables hereinafter show, notwithstanding their remarkable thermal stability which goes along with their very good results in TGA.

[0196]A. Experimental Protocol

[0197]The conditions of the experimental testing are as follows:[0198]0.6 ml of oil without anti-foam[0199]duration: 90 min[0200]plate made of an aluminum alloy tilted by 1.5%+ / −0.05% toward the hot point which is situated at the lower point comprising a trough[0201]temperature gradient here generally from 250° C. to 300° C. (or more, for exam...

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Abstract

Disclosed is a method of lubrication including a step of lubricating a machine with a lubricating composition, the lubricating composition including 20-100% ionic liquid or of a mixture of several ionic liquids. The ionic liquid or the mixture is selected from at least: an anion A− chosen from sulfonylimides, the substituent(s) of which is (are) independently chosen from a fluoroalkyl, fluoroether, perfluorinated alkyl or perfluoroether group; and a cation C+ including a nitrogen-containing heterocycle or a quaternary ammonium, the substituent(s) of which is (are) independently chosen from: a hydrogen atom or alkyl, alkoxy, fluorinated alkyl, perfluorinated alkyl, alkylsilane, alkyl alcohol, vinyl, alkyl allyl, ether or polyether groups having a linear or branched chain having 1-3 carbon atoms. The deposition start temperature in thin film of the ionic liquid or of the mixture of ionic liquids is at least equal to 330° C. The lubricating composition reduces deposits formed in the machine.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of lubricating compositions, especially for gas turbines of jet engines of aircraft or further for conveyor chains.[0002]Especially, the present invention relates to a method of diminishing the thin-film coking, at very high temperatures, of a lubricating composition comprising one or a mixture of several specific ionic liquids, especially as a base oil.PRIOR ART[0003]The gas turbines of aircraft need lubricating compositions of high performance which can be used over a very wide range of temperatures. The lubricating compositions intended for civilian and military aviation have to comply with very precise specifications figuring in detail in standards such as MIL PRF 23699 set up by the military authorities or standard AS 5780 set up by the SAE International. These standards determine, among other features, the physical and chemical properties, the levels of thermal stability, the stability with respect to oxida...

Claims

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Application Information

Patent Timeline
09 Nov 2017
Publication
US20170321142A1
IPC
C10M105/70; C10M105/72; C10M105/78; C10M105/74; C10M105/76
CPC
C10M105/70; C10M105/72; C10M105/74; C10M105/78; C10M105/76; C10N2230/08; C10N2240/52; C10M2219/09
Inventors
GOUJON, GERARD; SEVERAC, FLORENCE