KR-20260062966-A - lubricating oil composition

Abstract

A lubricating oil composition used with an oil seal comprising a base oil and at least one friction modifier selected from the group consisting of fatty acid ester compounds, amine compounds, amide compounds, imide compounds, phosphorus compounds, sulfur compounds, and phosphorus-sulfur compounds, and an inorganic filler.

Inventors

• 시타라, 유지
• 마츠오카, 마유코
• 오가타, 히데토시

Assignees

• 에네오스 가부시키가이샤

Dates

Publication Date

20260507

Application Date

20240905

Priority Date

20230908

Claims (6)

1. Giyu and, It contains at least one friction modifier selected from the group consisting of fatty acid ester compounds, amine compounds, amide compounds, imide compounds, phosphorus compounds, sulfur compounds, and phosphorus-sulfur compounds, and A lubricating oil composition used with an oil seal containing an inorganic filler.
2. A lubricating oil composition according to claim 1, wherein the oil seal further comprises a friction modifier.
3. A lubricating oil composition according to claim 1, wherein the oil seal further comprises at least one friction modifier selected from the group consisting of fatty acid ester compounds, amine compounds, amide compounds, imide compounds, phosphorus compounds, sulfur compounds, and phosphorus-sulfur compounds.
4. A lubricating oil composition according to paragraph 2, wherein the friction modifier in the lubricating oil composition and the friction modifier in the oil seal are fatty acid ester compounds.
5. A lubricating oil composition according to claim 4, wherein the fatty acid ester compound comprises a compound having a hydrocarbon group, an ester group, and a hydroxyl group.
6. A lubricating oil composition according to any one of claims 1 to 5, wherein the inorganic filler is an iron-based filler.

Description

lubricating oil composition The present invention relates to a lubricating oil composition. In mechanical systems constituting automobiles, etc., lubricating oil is used to lubricate the sliding parts of the mechanical system, and an oil seal is provided to prevent leakage of the lubricating oil from static or dynamic gaps occurring in the mechanical system (see, for example, Patent Document 1). Hereinafter, embodiments of the present invention will be described in detail. One embodiment of the present invention is a lubricating oil composition containing a base oil and a friction modifier. Examples of base oils include hydrocarbon oils and oxygen-containing oils. Examples of hydrocarbon oils include mineral oil, isoparaffin, alkylbenzene, alkylnaphthalene, polyα-olefin or its hydride, polybutene or its hydride, and ethylene-α-olefin copolymer. Examples of oxygen-containing oils include esters and ethers. Examples of esters include monoesters, diesters, polyol esters, and complex esters. Examples of ethers include polyalkylene glycol and polyvinyl ether. The hydrocarbon oil is preferably a mineral oil or an isoparaffin. Mineral oils include, for example, paraffinic mineral oils (normal paraffin, isoparaffin, etc.), naphthenic mineral oils, aromatic mineral oils, etc., obtained by refining a lubricating oil fraction obtained by atmospheric distillation and/or vacuum distillation of crude oil, using a single refining treatment or a suitable combination of two or more of the following: solvent dewaxing, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrogenation refining, sulfuric acid washing, and clay treatment. The isoparaffin may contain, as a main component, isoparaffins obtained by hydrocracking and/or hydrogenating isomerizing a paraffin wax component obtained through the above dewaxing process or Fischer-Tropsch synthesis. The acid-containing oil is preferably a polyol ester. The polyol ester is an ester of a polyhydric alcohol and a carboxylic acid, and preferably may be an ester of a polyhydric alcohol and a fatty acid. The polyhydric alcohol constituting the polyol ester may be a polyhydric alcohol having 2 to 6 hydroxyl groups. The number of carbon atoms in the polyhydric alcohol may be 4 to 12. Examples of polyhydric alcohols include hindered alcohols such as neopentyl glycol, trimethylolethane, trimethylolpropane, trimethylolbutane, di-(trimethylolpropane), tri-(trimethylolpropane), pentaerythritol, and dipentaerythritol. The polyhydric alcohol is preferably at least one selected from the group consisting of trimethylolpropane, pentaerythritol, and dipentaerythritol. The fatty acid constituting the polyol ester may be a saturated fatty acid or an unsaturated fatty acid. In one embodiment, when the polyhydric alcohol is trimethylolpropane, the fatty acid preferably comprises an unsaturated fatty acid. In another embodiment, when the polyhydric alcohol is pentaerythritol or dipentaerythritol, the fatty acid preferably comprises a saturated fatty acid. The number of carbon atoms in the unsaturated fatty acid may be 14 or more, or 20 or less. Examples of unsaturated fatty acids include piceteric acid, myristoleic acid, palmitoleic acid, heptadecenylene acid, petrocellidic acid, elaidic acid, oleic acid, and vacsenic acid. The unsaturated fatty acid preferably includes oleic acid. The number of carbon atoms in the saturated fatty acid may preferably be 4 or more, preferably 20 or less, more preferably 18 or less, and even more preferably 9 or less. Examples of saturated fatty acids include butanoic acid, pentacarbonic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanic acid, hexadecanoic acid, heptadecanic acid, octadecanic acid, nonadecanic acid, and icosanic acid. These saturated fatty acids may be straight-chain or branched. In one embodiment, the complex ester may be a complex ester of at least one selected from the group consisting of a polyhydric alcohol, a polycarboxylic acid, a monocarboxylic acid, and a monohydric alcohol. Examples of polyhydric alcohols constituting the complex ester may be the same as examples of polyhydric alcohols constituting the polyol ester described above. The polycarboxylic acid constituting the complex ester may be a dihydric carboxylic acid. The number of carbon atoms in the dihydric carboxylic acid may be 2 or more, preferably 4 or more, 12 or less, and preferably 10 or less. Examples of polyhydric carboxylic acids include succinic acid, adipic acid, azelaic acid, sebacic acid, etc. The monocarboxylic acid constituting the complex ester may be a fatty acid. Examples of fatty acids may be the same as the examples of fatty acids constituting the polyol ester described above. The number of carbon atoms of the monohydric alcohol constituting the complex ester may be 2 or more, preferably 4 or more, 20 or less, and preferably 10 o