摘要:
A lubricant composition that exhibits low high temperature high shear viscosity is disclosed. The lubricant composition is made up of a first polymer having a kinematic viscosity ratio less than or equal to 0.25 and a shear stability index (SSI) equal to or greater than 20 percent and base oil having a viscosity index equal to or greater than 120.
摘要:
Use of an oil-soluble hydrocarbyl phenol aldehyde condensate as an antiwear additive in a lubricating oil composition. The oil-soluble hydrocarbyl phenol aldehyde condensate has the following structure: wherein n is 0 to 10, preferably 1 to 8, more preferably 2 to 6, and most preferably 3 to 5; Y is a divalent bridging group, and is preferably a hydrocarbyl group, preferably having from 1 to 4 carbon atoms; and R is a hydrocarbyl group having from 4 to 30, preferably 8 to 18, and most preferably 9 to 15 carbon atoms.
摘要:
A trunk piston marine diesel engine lubricating oil composition is dispersant-free, has a TBN of 25 or greater, and comprises (A) an oil of lubricating viscosity, (B) an aromatic carboxylate as the sole overbased metal detergent, and (C) an antiwear additive.
摘要:
A marine diesel cylinder lubricant composition having a total base number of at least 30. The composition includes at least 40 weight per cent of an oil of lubricating viscosity, at least one detergent prepared from at least two surfactants, preferably phenate and sulphonate surfactants, at least one boron-containing dispersant providing at least 100 ppm of boron, and at least one zinc-containing antiwear additive, preferably a zinc dihydrocarbyl dithiophosphate, providing at least 230 ppm, preferably at least 250 ppm, of zinc. The marine diesel cylinder lubricant composition exhibits reduced wear even when used with high sulphur fuels.
摘要:
Para-alkylated substituted diphenylamines are made by catalytically alkylating diphenylamine with a branched-chain alkene, such as propene, oligomer mixture in which the oligomer present in the greatest percentage has 15-24 carbon atoms. The alkylated diphenylamines are useful crankcase lubricant additives such as for reducing piston deposits and engine sludge.
摘要:
Para-alkylated substituted diphenylamines are made by catalytically alkylating diphenylamine with a branched-chain alkene, such as propene, oligomer mixture in which the oligomer present in the greatest percentage has 15-24 carbon atoms. The alkylated diphenylamines are useful crankcase lubricant additives such as for reducing piston deposits and engine sludge.
摘要:
A marine diesel cylinder lubricant composition for a marine diesel engine running on fuel having a sulphur content of less than 1.5%, the composition having a total base number, as determined according to ASTM D2896, of more than 30 and less than 70, and comprising at least 40 wt % of an oil of lubricating viscosity, and at least one detergent prepared from at least two surfactants, one of which is a salicylate. The marine diesel cylinder lubricant composition demonstrates good ability to reduce deposit formation, especially on pistons. The marine diesel cylinder lubricant composition also demonstrates good lubrication at temperatures above 250° C.
摘要:
A high base number calcium sulphonate detergent having a total soap/BN ratio of 0.0530 to 0.0585, preferably 0.0540 to 0.0580, more preferably 0.0550 to 0.0575. The calcium sulphonate detergent has a base number of greater than 350 mg KOH/g as measured by ASTM D 2896-98. The high base number sulphonate exhibits reduced viscosity drift, improved stability and improved catalytic oxidation.
摘要翻译:总碱值为约0.001〜0.0585,优选0.0540〜0.0580,更优选0.0550〜0.0575的皂基/ BN比例的高碱值磺酸钙清净剂。 按照ASTM D 2896-98测定,磺酸钙去污剂的碱值大于350mg KOH / g。 高碱值磺酸盐表现出降低的粘度漂移,改进的稳定性和改进的催化氧化。
摘要:
A method of reducing deposit formation in a centrifuge system in a trunk piston diesel engine. The method includes the step of lubricating the trunk piston diesel engine with a trunk piston diesel engine lubricant composition having a total base number of more than 40 mg KOH/g, as determined by ASTM D2896, and including: at least 40 mass % of an oil of lubricating viscosity; at least one detergent, preferably at least two detergents; and at least 1.5 mass % of phenol, based on the total amount of the lubricant composition; with the proviso that if the trunk piston diesel engine lubricant composition includes at least one phenate detergent, the trunk piston diesel engine lubricant composition includes more than 1.7 mass %, preferably more than 1.9 mass %, of phenol.
摘要:
A lubricating oil composition suitable for a trunk piston marine diesel engine. The lubricating oil composition comprises an admixture of: (A) an oil of lubricating viscosity, in a major amount; and (B) an oil-soluble complex overbased metal detergent additive, in a minor amount. The composition is substantially dispersant-free or contains 1, or less than 1, preferably less than 0.5, mass % based on the mass of the compositions, of a dispersant. The composition has a TBN in the range of 3.5 to 100, preferably 8 to 100.