Nitrogen-, phosphorus- and sulfurcontaining lubricants

摘要

Lubricant compositions, which are particularly suitable for lubricating power-transmitting units employing frictional clutch plates, comprise a lubricating oil (which may be of petroleum origin), 0,01-2,0% by weight as phosphorus of an oil-soluble Group II metal phosphorodithioate and 0,05-3,0% by weight of an oil-soluble amide of an acid of the formula RCOOH, where R is a hydrocarbon group, the amide having at least 12 aliphatic or cycloaliphatic carbon atoms per molecule. The phosphorodithioate may be a barium, magnesium, stronium, cadmium, calcium or zinc salt of a dialkyl, diaryl, dicycloalkyl or alkylcycloalkyl phosphorodithioic acid. The amide may be a fatty acid or naphthenic acid amide and may carry one or two hydrocarbon groups (e.g. alkyl or cycloalkyl) as substituents on the nitrogen atom. The lubricant composition may contain additional ingredients such as oxidation or corrosion inhibitors (e.g. phosphorus sulphide-treated cyclic olefinic substances, substituted phenolic compounds, or arylamines), viscosity improvers (e.g. alkyl acrylate or methacrylate polymers or isobutene polymers), foam suppressors (e.g. silicones or alkyl acrylate polymers), E.P. additives (e.g. organic sulphides or polysulphides, xanthates, phosphorus sulphide-treated fatty oils, or chlorinated hydrocarbons), and dispersants (e.g. normal or basic metal salts of the following:-alkyl phenols, alkyl phenol sulphides, sulphonic acids, fatty acids, phosphorus sulphide-treated olefin polymers, phosphorus chloride-treated chlorinated hydrocarbons, or reaction products of olefin polymers with sulphur and phosphorus trichloride). In examples, mineral lubricating oil compositions are described in which the phosphorodithioate is chosen from zinc di(isooctyl, tridecyl or heptylphenyl) phosphorodithioate, the zinc salt of the phosphorodithioic acid prepared by reacting P2S5 with a mixture of isobutanol and isopentanol, or a mixture of zinc di(isooctyl) and di(methylcyclohexyl) phosphorodithioates, and the amide is chosen from (a) a mixture of oleamide, stearamide and linoleamide, (b) a mixture of lauramide, myristamide, palmitamide, caprylamide, capramide and oleamide, (c) N-butyl oleamide, (d) the amide of a petroleum naphthenic acid or (e) a mixture of the N-octadecylamide of tall oil fatty acid with amide (a). In further examples, mineral lubricating oil compositions are described which contain dodecenyl succinic acid, alkyl acrylate polymer, chlorinated eicosane and dibutyl polysulphide together with a phosphorodithioate chosen from zinc (4-methyl-pentyl-2) phosphorodithioate or the zinc salt of an acid obtained by reacting P2S5 with a mixture of isopropanol and 4-methyl-pentanol-2, and an amide chosen from tall oil fatty acid amide or the amide (a) mentioned above. Two further mineral oil compositions mentioned contain (1) an alkylene polyamine salt of an alkenyl succinic acid, dimethyl silane polymer, alkyl acrylate polymer, wax-substituted naphthalene, zinc di-isooctyl phosphorodithioate and the amide (a) mentioned above and (2) chlorinated paraffin wax, an alkenyl succinic acid, alkyl acrylate polymer, zinc di(4-methyl-amyl-2) phosphorodithioate and the amide (a).