摘要:
Improved hydraulic fluids or metalworking lubricants, utilizing mixtures of water, metal lubricants, metal corrosion inhibitors, and an associative polyether thickener, have reduced dependence of the viscosity on temperature achieved by the incorporation therein of an ethoxylated polyether surfactant.
摘要:
PROBLEM TO BE SOLVED: To provide a lubrication oil composition that exhibits enhanced oxidative stability when used to lubricate a spark-ignited or compression-ignited internal combustion engine fuelled with a biofuel.SOLUTION: The lubricating oil comprises: (A) an oil of lubricating viscosity in a major amount; and (B) an oil-soluble polymeric additive component (B) as an additive in a minor amount.
摘要:
There are provided a heat resistant lubricating oil composition comprising a lubricating base oil comprising an organic ester or a mixture of an organic ester and a polyphenyl ether or an organopolysiloxane, and incorporated with from 0.05% by weight to 10% by weight, based on the total weight of the lubricating oil composition, of a polyphenyl thioether represented by the following general formula ÄIÜ: where R , R and R which may be identical or different with each other each represent a hydrogen atom or a hydrocarbon group of 1 to 24 carbon atoms, x, y and z which may be identical or different with each other each represent an integer of 1 to 4 and m represent 0 or an integer of 1 to 3, a heat resistant lubricating oil composition containing, as a lubricating base oil, at least from 10% by weight to 90% by weight of a component selected from the group consisting of an organic ester, and a mixture of an organic ester and a polyphenyl ether or an organopolysiloxane and from 90% by weight to 10% by weight of the polyphenyl thioether represented by the general formula ÄIÜ described above, as well as a method of preventing oxidation of a heat resistant lubricating oil composition, further, a process for producing a polyphenyl thioether including a purification treatment for the improvement of the weather resistance of the polyphenyl thioether. The heat resistant lubricating oil composition obtained by the present invention has high heat resistance and oxidation resistance under a high temperature condition and can withstand severe working conditions such as in jet engines or gas turbines.
摘要:
Compounds having the following formula: wherein: A and A 1 , equal or different, are respectively H or an aromatic end group as defined below; optionally said aromatic group being substituted; n is an integer different from zero, such that the number average molecular weight of the compound of formula (I) is in the range 1,800-50,000, T is the bivalent group -Y-CH 2 -CFW 1 -O-Rf-CFW 2 -CH 2 -Y- wherein: Y = O, S; W 1 and W 2 , equal or different, are F, CF 3 ; Rf is a (per)fluoropolyoxyalkylene chain formed of one or more repeating units, statistically distributed along the chain; R 1 , R 2 , R 3 , equal to or different from each other, are selected from H; linear or branched C 1 -C 8 perfluoroalkyl, linear or branched C 1 -C 15 (per)fluorooxyalkyl; linear or branched C 1 -C 8 alkyl; linear or branched C 1 -C 8 oxyalkyl, optionally containing one or more oxygen atoms; NO 2 ; CN.
摘要:
PROBLEM TO BE SOLVED: To provide an improved method for preparing polyalkenyl sulfonic acid. SOLUTION: The method for preparing a polyalkenyl sulfonic acid to be overbased includes using water as a promoter and overbasing the polyalkenyl sulfonic acid by a basic salt of an alkaline earth metal. COPYRIGHT: (C)2011,JPO&INPIT