The invention relates to the use of one or more fatty amines that are soluble in a lubricant composition comprising at least one detergent in order to reduce and/or control the abnormal combustion of gas in a marine engine, the amine/detergent weight 1-1 ratio being between 0.01 and 0.5. The invention also relates to a process for reducing and/or controlling the abnormal combustion of gas in a marine engine in which the gas is in contact with one or more fatty amines that are soluble in a lubricant composition comprising at least one detergent, the amine/detergent weight ratio being between 0.01 and 1, preferably between 0.01 and 0.9, more preferentially between 0.02 and 0.8, for example between 0.03 and 0.8, in particular between 0.01 and 0.5, preferably between 0.01 and 0.4, for el example between 0.02 and 0.4.

The present application relates to metal cutting, and more particularly to a cutting fluid and a preparation method and an application thereof, especially the application in the processing of niobium-tungsten alloy (NB521). The preparation method of the cutting fluid is simple and requires low production cost. In the mechanical processing of niobium-tungsten alloy (NB521), the cutting fluid has good cooling performance, lubricity, load-bearing capacity, friction reduction and vibration absorption, and long service life. It also can effectively avoid built-up edges, thereby improving the service life of cutting tools and the processibility of materials. Therefore, products of good quality are produced to improve the yield, especially in the deep hole machining, and thus the cutting fluid of the present application is suitable for a wide range of applications.

The invention relates to the use of one or more fatty amines that are soluble in a lubricant composition comprising at least one detergent in order to reduce and/or control the abnormal combustion of gas in a marine engine, the amine/detergent weight 1-1 ratio being between 0.01 and 0.5. The invention also relates to a process for reducing and/or controlling the abnormal combustion of gas in a marine engine in which the gas is in contact with one or more fatty amines that are soluble in a lubricant composition comprising at least one detergent, the amine/detergent weight ratio being between 0.01 and 1, preferably between 0.01 and 0.9, more preferentially between 0.02 and 0.8, for example between 0.03 and 0.8, in particular between 0.01 and 0.5, preferably between 0.01 and 0.4, for el example between 0.02 and 0.4.

The present invention provides a compound represented by formula (1) (in formula (1), R.sup.1 and R.sup.2 each independently represent a group represented by formula (2) or NHR.sup.0 (where R.sup.1 and R.sup.2 are not simultaneously NHR.sup.0), R.sup.0 represents any one of hydrogen, an alkyl group having 1-20 carbon atoms, an alkenyl group having 2-30 carbon atoms, an aryl group having 6-30 carbon atoms, an alkylaryl group having 7-30 carbon atoms, and an arylalkyl group having 7-30 carbon atoms, each R.sup.3 independently represents hydrogen or a hydrocarbon group having 1-30 carbon atoms, l represents an integer of 0-4, m represents an integer of 1-4 (where m is an integer of 2-4 in the case where R.sup.1 and R.sup.2 are a group represented by formula (2)), and each n independently represents an integer of 0-4, and, in formula (2), R.sup.4 represents a hydrocarbon group having 6-24 carbon atoms, and X.sup.1 and X.sup.2 each independently represent an oxygen atom or a sulfur atom).

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An object of the present invention is to provide a lubricating oil composition for hydraulic actuation which has excellent safety and which is imparted with electrical conductivity in order to prevent the generation of noise that adversely affects devices including hydraulic circuits equipped with an electronic control device for the valve system. The composition uses a hydrocarbon base oil, and the base oil contains from 30 to 250 ppm of ultrabasic magnesium salicylate in terms of magnesium content relative to the total amount of the composition, and from 0.07 to 5.0 mass % of non-dispersible polymethacrylate having a weight-average molecular weight of from 5,000 to 200,000 as a net amount relative to the total amount of the composition. The conductivity of the composition at 25 C. is 200 pS/m or more, the flash point is 240 C. or more, the pour point is negative 40 C. or less, and the coefficient of friction at 140 C. by a microclutch is 0.08 or more. This lubricating oil composition can be imparted with conductivity in order to prevent the generation of noise that adversely affects electronic controls when used in machinery equipped with electronic control devices.

Provided are a lubricating oil composition having a high intermetallic friction coefficient and having excellent clutch anti-shudder performance of excellent initial clutch anti-shudder performance and a long clutch anti-shudder lifetime, and a lubrication method and a transmission using the lubricating oil composition. The lubricating oil composition contains an amide compound (A) having a specific structure, a metal-based detergent (B), and at least one phosphorus acid ester (C) selected from an acid phosphate ester and an acid phosphite ester; and the lubrication method and the transmission use the lubricating oil composition.

Provided are a lubricating oil composition containing a component (A): a succinimide having an alkenyl group or an alkyl group, a component (B): a primary amine having a hydrocarbon group having 12 or more and 24 or less carbon atoms, a component (C): a fatty acid amide compound, and a component (D): an amide compound having a specific structure, and capable of satisfying both a high clutch capacity and a long anti-shudder lifetime; and a lubrication method and a transmission using the composition.

The present invention provides a grease composition for constant-velocity joints comprising (a) a base oil, (b) a diurea thickener, (c) molybdenum dithiocarbamate, (d) molybdenum dithiophosphate, (e) overbased calcium sulfonate, and (f) neutral zinc sulfonate. The composition of the present invention is excellent in durability at high temperature and vibration suppression.

A friction control composition having high and positive frictional properties for sliding steel surfaces includes a water insoluble hydrocarbon that enables a reduced water content, a rheological additive, a freezing point depressant, a friction modifier, and a lubricant.

The present invention provides an engine oil additive for enhancing engine function and improving fuel economy, the additive allowing engine oil particles to be ionized and fragmented by natural minerals simply and inexpensively without a separate device, such that the interval at which the engine oil particles come into contact with the inner wall of an engine decreases and the plasma state is maintained so as to prevent cations and anions from coupling to each other in liquid, and fuel economy is improved while engine activity is enhanced. To this end, the additive is obtained by mixing 1.5-2 wt % of tourmaline, 0.8-1 wt % of sericite, 0.5-0.8 wt % of monazite and 0.3-0.5 of elvan, in a powder form of 2-3 m into 95.7-96.9 wt % of a base oil so as to be added to an engine oil to be injected into an engine.