摘要:
An oleaginous corrosion-resistant lubricating composition comprising at least one poly-alpha olefin synthetic oil and effective amounts of metal salts of sulfonic acids, metal salts of carboxylic acids, metal salts of mixtures of said sulfonic and carboxylic acids, alkylated aromatic stabilizers as solubility modifiers, pour-point depressants, at least one antioxidant, triazole deactivator compounds and fluoroacrylate copolymers.
摘要:
The present invention relates to the use of highly viscous (per)fluoropolyether polymers as damping fluids and to a method for counteract vibrations and/or shocks in a device using highly viscous (per)fluoropolyether polymers.
摘要:
A lubrication method comprising applying to a surface to be lubricated a polymer comprising a partially or fully fluorinated, straight or branched, polyoxyalkylene chain (chain Rf) having two chain ends, wherein one or both chain end(s) bear(s) a hydroxy- or alkoxy-terminated polyoxyalkylene chain free from fluorine atoms (chain Ra), said chain comprising from 4 to 50 fluorine-free oxyalkylene units, said units being the same or different from one another and being selected from —CH2CH2O— and —CH2CH(J)O—, wherein J is independently straight or branched alkyl or aryl, with the proviso that, if both chain ends bear a hydroxy-terminated chain Ra comprising only —CH2CH2O— units, chain Rf does not consist only of —CF2CF2O-units. Lubricant compositions containing the polymer and methods for preparing the polymer are also herein disclosed.
摘要:
Hydrofluoro alcohols of formula (I): A-(Rf)a—CFX—O—RhO—(CFX—(Rf)a*—CFX—O—RhO—)nH in which: Rh is a hydrocarbon-based chain; X is F or a C1-C6 (per)fluoroalkyl; a or a* is 0 or 1; Rf is a (per)fluoro(poly)oxyalkylene chain or a (per)fluoroalkyl chain; A is selected from the group consisting of —F, —Cl, and —H (possible only when a=1) or is HO—Rh—O—CFX—; n is an integer from 0 to 200, with the condition that n=0 when A is selected from the group consisting of —F, —Cl, and —H.
摘要:
The present invention provides a lubricant for forming a lubricating layer which is useful in preventing fly and stiction and/or corrosion at an extremely small flying height of 10 nm or less, which is prevented from migrating at a high rotational speed of 5400 rpm or more, which has high adhesion, and which is suitable for a load/unload method. A crude lubricant containing at least one perfluoropolyether is degassed and then purified. Alternatively, a liquid crude lubricant containing at least one perfluoropolyether is purified by vaporizing the crude lubricant and then liquefying the vapor of the perfluoropolyether within a distance less than the mean free path of molecules of the perfluoropolyether. A magnetic disk is prepared in such a manner that a carbonaceous protective layer is formed above a substrate and a lubricating layer is formed on the protective layer using of the lubricant. The lubricant contains the perfluoropolyether and has a molecular weight distribution of 1.3 or less.
摘要:
Compounds usable as stabilizing additives of perfluoropolyether fluids working at high temperatures, higher than 200° C. and/or in the presence of metals and/or in the presence of Lewis acids, are formed of (per)fluoropolyether chains and of end groups having a heteroaromatic structure, according to the following general formula: T1-CFW1—O—Rf—CFW2-T2 (I) wherein T1, T2, equal to or different from each other, have the following meanings: F, CF3, C2F5, (C2F4)Cl —CH2—B—Y, —CH(CF3)O—Y, wherein: B═O, S: Y is a substituent formed of a ring having a heterocyclic structure having the following formula: wherein: R1, R2, R3, R4, equal to or different from each other are H, linear or branched C1-C8 perfluoroalkyl, NO2, CN, preferably H; with the proviso that at least one of the two end groups T1, T2 is —CH2—B—Y or —CH(CF3)O—Y, wherein B and Y are as above: W1, W2, equal to or different from each other, are —F, —CF3: Rf is a (per)fluoropolyoxyalkylene chain having a number average molecular weight between 500 and 10,000, preferably between 800 and 5,000.
摘要:
The invention relates to a process for reducing the back migration of the most volatile fractions of perfluoropolyethers during the operation of mechanical vaccum-generating pumps which utilize perfluoropolyethers: use is made of perfluoropolyethers containing not more than 0.1% by weight of fractions having a molecular weight lower than or equal to 1,500 and not more than 1.3% by weight of fractions having a molecular weight lower than or equal to 1,800.
摘要:
A plain bearing material, e.g. for a bearing bush or a thrust washer has a composition of 45 to 60 weight percent of semiaromatic polyamide, 15 to 20 weight percent of glass fibre, 10 to 20 weight percent of graphite, 10 to 20 weight percent of polytetrafluoroethylene and up to 5 weight percent of silicon oil.
摘要:
An oil-soluble copolymer, useful as a pour point depressant for lubricating oils, is composed of about equimolar amounts of 1-olefins and maleic anhydride, said 1-olefins being a mixture comprising from about 25 to 75, preferably 30 to 55, mole percent of straight chain C.sub.20 -C.sub.24 1-olefins and from about 25 to 75, preferably 45 to 70, mole percent of C.sub.10 -C.sub.14 1-olefins.These useful copolymers are oil-soluble, essentially free of olefinic unsaturation and have a number average molecular weight of from 1,000 to 30,000. Pour point depressant activity of said copolymers is enhanced by esterification with a C.sub.1 to C.sub.8 alcohol, e.g. 2-ethyl hexanol.The copolymers are usefully admixed with lubricants in an amount of from 0.01 to 3 wt. % based on the total weight of the admixture.
摘要:
A lubricant composition comprising 100 parts by weight of an oil having a lubricating oil viscosity and 0.1 to 50 parts by weight of a copolymer of isobutylene and/or propylene with at least one acrylic ester compound, especially a copolymer of isobutylene with at least one acrylic ester. In said composition, the improving effect of the visocity index is excellent and the composition is excellent in shear stability, thermal resistance, aging resistance, and demulsibility.