Method for producing lubricant additive (variants)

Abstract

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 M 2 MoS 4-x O x , wherein M=NH 4 , 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 1 R 2 R 3 R 4 NX, wherein R 1 R 2 R 3 and R 4 equal or different are selected from a group containing C 1 -C 16 alkyl, X=Cl, Br, the second modifier being embodied in the form of a succinimide of the general formula Formula wherein R 5 =straight or branched-chain alkyl or oligoalkylene whose molar mass ranges from 140 to about 1000, R 6 is selected from a group comprising H, —C(═O)NH 2 , —(CH 2 CH 2 NH) n CH 3 , n=14. 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 M 2 MoO 4 , wherein M=NH 4 , Na, and a sulphur donator embodied in the form of an inorganic sulphide or a polysulfide of the general formula M′ 2 S n , wherein M′=M=NH 4 , Na, n=1-4, or a thiocarbamide, afterwards, the first variant being used.

1 . A method of preparing additives for lubricating materials on the basis of chemically modified nanosized particles of molybdenum trisulfide and/or derivatives thereof, characterized in that the nanosized particles of molybdenum trisulfide and/or derivatives thereof are prepared from salts of thiomolybdic acid of the general formula M 2 MoS 4-x O x , where M is NH 4 , Na, x is 0-3, in the presence of two modifiers, where tetraalkylammonium salts or mixtures of salts of the general formula R 1 R 2 R 3 R 4 NX are used as the first modifier, wherein R 1 , R 2 , R 3  and R 4  are identical or different and are selected from the group consisting of C 1 -C 16  alkyl, X is Cl, Br, while derivatives of succinimide of the general formula  
     
       
         
         
             
             
         
       
     
     are used as the second modifier, wherein R 5  is normal or branched alkyl or oligoalkylene having a molecular weight of from 140 to about 1000, R 6  is selected from the group consisting of H, —C(═O)NH 2 , —(CH 2 CN 2 NH) n CH 3 , n is 1-4, 
 wherein the process is carried out by thermally processing a homogenized in a polar solvent mixture of said salt of thiomolybdic acid and said first or second modifier, cooling the obtained mixture and subsequently adding said second or first modifier, respectively.  
 
   
   
       2 . A method of preparing additives for lubricating materials on the basis of chemically modified nanosized particles of molybdenum trisulfide and/or derivatives thereof, characterized in that the nanosized particles of molybdenum trisulfide and/or derivatives thereof are prepared from salts of molybdic acid of the general formula M 2 MoO 4 , where M is NH 4 , Na, and a sulfur donor, which is an inorganic sulfide or polysulfide of the general formula M′ 2 Sn wherein M′ is NH 4 , Na, n is 1-4, or thiourea, in the presence of two modifiers, where tetraalkylammonium salts or mixtures of salts of the general formula R 1 R 2 R 3 R 4 NX are used as the first modifier, wherein R 1 , R 2 , R 3  and R 4  are identical or different and are selected from the group consisting of C 1 -C 16  alkyl, X is Cl, Br, while derivatives of succinimide of the general formula  
     
       
         
         
             
             
         
       
     
     are used as second modifier where R 5  is normal or branched alkyl or oligoalkylene having a molecular weight of from 140 to about 1000, R 6  is selected from the group consisting of H, —C(═O)NH 2 , —(CH 2 CN 2 NH) n CH 3 , n is 1-4, 
 wherein the process is carried out by thermally processing a homogenized in a polar solvent mixture of said salt of molybdic acid, said sulfur donor which is an inorganic sulfide, polysulfide or thiourea, and said first and/or second modifier, cooling the obtained mixture and subsequently adding said second and/or first modifier, respectively.  
 
   
   
       3 . The method according to  claim 1  characterized in that the thermal processing is carried out at a temperature of 150 to 220° C. for 1-2 hours.  
   
   
       4 . The method according to  claim 1 , characterized in that methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, 2-butanol, acetone or benzene is used as the solvent.  
   
   
       5 . The method according to  claim 2 , characterized in that the thermal processing is carried out at a temperature of 150 to 220° C. for 1-2 hours.  
   
   
       6 . The method according to  claim 2 , characterized in that methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, 2-butanol, acetone or benzene is used as the solvent.