Idemitsu Kosan Company, Limited

Petroleum Energy Center, a Juridical Incorporated Foundation

Tadashi Katafuchi

Akira Nakamura

Motoharu Ishikawa

Seiichi Shido

Kenji Onodera

Takeshige Nakano

Yasunori Tomari

Hiroo Mitazaki

Provided are a method of measuring a degree of degradation of a lubricating oil and a measuring device therefor, in which (a) acidity is measured through use of an ISFET of hydrogen ion sensitive type and (b) dielectric constants or electrostatic capacitances at two or more different frequencies are obtained, to thereby determine a degradation state of the lubricating oil based on the acidity and a plurality of values of the dielectric constants or the electrostatic capacitances. Accordingly, the degree of degradation of the lubricating oil can be measured easily and precisely and a degradation mechanism of the lubricating oil can be predicted.

Measuring method for degree of degradation of lubricating oil, and measuring device therefor, as well as lubricating oil monitoring system in machine and device

Provided is a method of measuring a degree of degradation/alteration of a lubricating oil, including obtaining dielectric constants or electrostatic capacitances at two or more different frequencies and determining a degradation/alteration state of the lubricating oil based on values of the dielectric constants or the electrostatic capacitances, in which one frequency (H) of the two or more frequencies is in a range of 1 to 100 Hz, and another frequency (H) is more than the frequency (H) and in a range of 10,000 Hz or less. Accordingly, it is possible to provide a method of measuring a degree of degradation/alteration of a lubricating oil and a measuring device therefor, which are capable of measuring a degree of degradation of the lubricating oil easily and precisely and predicting a degradation/alteration mechanism of the lubricating oil.

Measurement method of degradation/alteration degree of lubricant oil and measurement device thereof

A method of evaluation a degree of degradation of a lubricating oil, comprising: using a device for evaluating a degree of degradation of a lubricating oil, the device comprising a pH-ISFET which is free from a reference electrode; and measuring a current flowing between a drain and a source of the pH-ISFET with a first circuit wherein a constant voltage is applied between the drain and the source, or measuring a voltage between a drain and a source with a second circuit wherein a constant current is caused to flow between the drain and the source.

Device for evaluating degree of degradation of lubricating oil

A lubricating oil composition for diesel engines, particularly a composition with low ashes and no metals. The lubricating oil composition has exceedingly high detergency and excellent antiwear so that it is suitably used for diesel engines equipped with an apparatus for after-treatment of exhaust gas. The lubricating oil composition contains a lubricating base oil which includes a component (A): 2 to 30% by mass, based on the total amount of the composition, of a succinimide compound having an alkenyl group or an alkyl group of a number average molecular weight of 80 to 500 or a boronic compound thereof; and a component (B): 0.5 to 30% by mass, based on the total amount of the composition, of a succinimide compound having an alkenyl group of a number average molecular weight of 800 to 3,500 or a boronic compound thereof.

Lubricating oil composition for diesel engine

A lubricating composition comprising a base oil, (A) one or more kinds of compounds selected from phenolic antioxidants and aminic antioxidants, and (B) an ester compound having a disulfide structure is provided. The lubricating composition of the present invention has excellent stability against oxidation, prevents increase of acid value and sludge formation, and has low corrosivity to non-ferrous metals.

Lubricating composition

An additive to a fuel oil for a Diesel engine having a Diesel particulate filter (DPF), which comprises a molybdenum compound and having the function of improving the combustion property of a particulate matter (PM) trapped with DPF; a fuel oil comprising the additive; a lubricating oil composition for a Diesel engine having DPF, which has a sulfated ash content of 1.0% by weight or smaller, a sulfur content of 0.3% by weight or smaller and a molybdenum content of 100 ppm or greater; and DPF for removing PM in combustion gas discharged from a Diesel engine vehicle by trapping and burning PM, DPF comprising a filter supporting a molybdenum compound. The combustion property of PM trapped with the filter of DPF is improved, PM is burned at a low temperature with stability, the efficiency of removal of PM is improved and the life of DPF is increased.

Additive for diesel particulate filter

A lube oil composition which is suitably used for diesel engines which exhaust large amounts of sulfur dioxides (So ). The composition exhibit excellent corrosion/wear preventive properties against SO . The lube oil composition of the invention for diesel engines includes a lube oil base having a kinematic viscosity of 8-35 mm /s at 100&deg; C.; a component (A) which is a compound selected from the group consisting of over based sulfonates of alkaline earth metals, over based phenates of alkaline earth metals, and over based salicylates of alkaline earth metals; and a component (B) which is a bis-type succinic imide compound having an absorption ratio, &agr;/&bgr; (wherein &agr; is the intensity of an absorption peak at 1550&plusmn;10 cm and &bgr; is the intensity of an absorption peak at 1700&plusmn;10 cm ), of absorption peaks in an IR spectrum of not more than 0.005.

Lube oil compositions for diesel engines

Disclosed is a diesel engine oil composition containing a lube oil base and one or more metallic detergent-dispersants selected from among a perbasic alkaline earth metal sulfonate, phenolate, and salicylate. The total phosphorus content of the composition is suppressed to 100 ppm by weight or less, to thereby provide diesel engine oil compositions having excellent oxidation stability and wear resistance.

Diesel engine oil composition

Disclosed are novel succinimide compounds effective in diesel engine lubricating oil for protecting engine parts from being corroded or worn by SOx. An acid compound of formula (I) or (II) is reacted with a polyamine to produce the succinimide compounds, which give an absorption peak (.alpha.-peak) at 1640.+-.cm.sup.-1 and an absorption peak (.beta.-peak) at 1700.+-.10 cm.sup.-1 in the IR spectral pattern with the ratio, .alpha.-peak intensity/.beta.-peak intensity, of being 0.12 or more. [1] ##STR1## R is an alkenyl or alkyl group derived from a C2 to C15 olefinic polymer and having a number-average molecular weight of from 200 to 4000. The succinimide compound is added to base oil along with a metallic detergent-dispersant additives selected from over-based sulfonates, phenates and salicylates of alkaline earth metals to give a lubricating oil composition for diesel engines.

Succinimide compound and method for producing it, lubricating oil

Refrigerator oil and process for lubrication using the refrigerator oil

A neutralization testing apparatus and a neutralization testing method which allow a neutralization reaction rate of a liquid sample such as lubricant oil to be accurately measured are provided. Reagent injecting device for injecting a reagent which neutralizes the liquid sample is provided on a lid member of a closed container into which the liquid sample is charged. The reagent injecting device is an acid injecting port which penetrates through the closed container and an air-tight sealing member which closes the acid injecting port and which permits an injector needle for injecting the reagent to penetrate therethrough. Because no gas leakage occurs even when the injector needle is penetrated because of the elasticity of the air-tight sealing member, the measuring conditions within the closed container do not change and the neutralization reaction rate may be found accurately.

Neutralization testing apparatus

A lubricant composition for compression-type refrigerating machines containing tetrafluoroethane or the like as a refrigerant and a lubricant comprising (A) 40 to 95% by weight of a synthetic oil composed of a poly-.alpha.-olefin and/or an ethylene/.alpha.-olefin copolymer or a mixture of an alkylbenzene and a poly-.alpha.-olefin and/or an ethylene/.alpha.-olefin copolymer and (B) 5 to 60% by weight of a fluidity improver composed of both or either of an ester compound and a triglyceride. The lubricant composition is excellent in the performance such as wear resistance, electrical insulating properties, hydrolytic stability, nonhygroscopicity, etc. and also in returnability of the lubricant composition. Thus, the lubricant is especially effective when used in automobile or household air conditioner, refrigerator, etc. having high industrial usefulness.

Lubricant for refrigerating machine employing refrigerant comprising

There has been disclosed herein a lubricant for refrigerating machines employing tetrafluoroethane or the like as a refrigerant which comprises as an essential component a base oil comprising (A) 40 to 95% by weight of a synthetic oil composed of a poly-.alpha.-olefin and/or an ethylene/.alpha.-olefin copolymer or a mixture of an alkylbenzene and a poly-.alpha.-olefin and/or an ethylene/.alpha.-olefin copolymer and (B) 5 to 60% by weight of a fluidity improver composed of a polyoxyalkylene glycol compound, etc. The lubricant is used along with a refrigerant comprising a substituted flon compound such as 1,1,1,2-tetrafluoroethane (R-134a), and is excellent in the performance such as wear resistance, electrical insulating properties, hydrolytic stability, nonhygroscopicity, etc. and also in returnability of the lubricant. Thus, the lubricant is especially effective when used in automobile or household air conditioners, refrigerators, etc. having high industrial usefulness.

Lubricant refrigerant comprising composition containing fluorohydrocarbon

A lubricating oil for metal working comprises a base oil and a diester of a branched aliphatic dicarboxylic acid having from 12 to 28 carbon atoms and a straight chain aliphatic alcohol having from 1 to 6 carbon atoms. The lubricating oil is excellent in rolling properties and causes no heat scratching, and permits the production of rolled plates having good gloss. These properties are further improved by adding a monoester compound having from 13 to 48 carbon atoms to the above oil.

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Chiba, Japan

Tadashi Katafuchi