METHOD FOR PRODUCING LUBRICANT ADDITIVE (VARIANTS)

The invention relates to petroleum chemistry, more specifically to sulfur-containing molybdenum compounds and to the use thereof in the form of lubricant additives which decrease friction coefficient. In the first variant, molybdenum trisulfide nanoparticles and the derivatives thereof are produced from thio-molybdenum acid salts of the general formula M2MoS4-x Ox, wherein M=NH4, Na, x=0-3 in the presence of two modifiers, one of them being embodied in the form of tetra-alkyl-ammonium salts or a mixture of salt of the general formula R R R R NX, wherein R R R and< >R equal or different are selected from a group containing C1-C16 alkyl, X=Cl, Br, the second modifier being embodied in the form of a succinimide of the general formula Formula wherein R = straight or branched-chain alkyl or oligoalkylene whose molar mass ranges from 140 to about 1000, R is selected from a group comprising H, -C(=O)NH2, -(CH2CH2 NH)nCH3, n=1-4. The process is carried out by means of a thermal treatment which is homogenised in the polar solvent of the mixture of a thio-molybdenum acid salt and the first or second modifier, cooling the thus produced mixture and a subsequently adding the second or the first modifier, respectively. In the second variant, the inventive method consists in producing molybdenum trisulfide nanoparticles and the derivatives thereof from molybdenum acid salts of the formula M2MoO4, wherein M=NH4, Na, and a sulphur donator embodied in the form of an inorganic sulphide or a polysulfide of the general formula M'2Sn, wherein M'= M=NH4, Na, n=1-4, or a thiocarbamide, afterwards, the first variant being used. L'invention appartient au domaine de la pétrochimie et concerne plus particulièrement des composés de molybdène contenant du soufre et leur utilisation en tant qu'additifs de lubrifiants abaissant le coefficient de frottement. Dans un premier mode de réalisation, les nanoparticules de trisulfure de molybdène et de ses dérivés sont obtenues à partir de sels d'acide thiomolybdénique correspondant à la formule générale M2MoS4-xOx dans laquelle M = NH4, Na, x = 0-3 en présence de deux modificateurs dont le premier correspond aux sels tétralkylammoniaques ou à des mélanges de sels correspondant à la formule générale R R R R NX dans laquelle R R R et R sont identiques ou différents; ils sont sélectionnés dans un groupe contenant des alkyles C1-C16, X = CXl, Br, et le deuxième correspond à des dérivés de succinimide correspondant à la formule générale suivante (fo