Patent ID: 9512377
Filing Date: 2016-12-06
CPC Classification: B82Y,C01G,C01P,C10M,C10N

Claim Text:
1. A process for production of solid lubricant nanoparticles, obtained from molybdenum or tungsten compounds to form lamellar metallic disulphides, characterized in that it comprises the steps of: a—dissolving, under stirring, a source of the metallic element which defines the solid lubricant, in a solvent comprising water and heated between 50° C. and 90° C., forming a first aqueous solution; b—dissolving, under stirring, a reducing agent selected from hydroxylamine, sodium hypophosphite and sodium borohydride, in a solvent comprising water and heated between 50° C. and 90° C., forming a second aqueous solution; c—mixing the first and second aqueous solutions, forming a third aqueous solution, containing the metallic element which defines the solid lubricant and the reducing agent; d—adjusting the pH of the third aqueous solution, to a neutral condition; e—dissolving, under stirring, a sulphur source, in a solvent comprising water and heated between 50° C. and 90° C., forming a fourth aqueous solution; f—mixing the third and fourth aqueous solutions, forming a fifth aqueous solution, containing the metallic element, the reducing agent and the sulphur; g—containing the fifth aqueous solution in an autoclave and submitting it to heating for a period from 3 h to 150 h, and at a temperature from 100° C. to 350° C.; h—cooling the fifth aqueous solution, still contained in the autoclave, to the room temperature, as a function of the morphological characteristics of the nanoparticles to be obtained; and i—removing, from the autoclave, the nanoparticles obtained in the powder form, and submitting them to water-washing and drying operations.