Solid lubricant and process for preparing it
AssigneeEnichimica Secondaria S.p.A.
InventorGian P. Gambaretto
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Abstract
A solid lubricant, consisting of solid perfluorocarbons, with linear or substantially linear carbon atoms chain, containing from 10 to 20 carbon atoms and having a value of surface tension ranging from 13 to 15 dyne/cm, is obtained by dimerization or co-dimerization of perfluorocarbonsulphonyl halogenides C.sub.n F.sub.2n+1 SO.sub.2 X (in which X represents an atom of halogen), having a linear or substantially linear chain of carbon atoms and bearing the --SO.sub.2 X group at one end of the chain, operating at high temperature, with short reaction times, and preferably in the presence of a metal catalyst. The solid perfluorocarbon lubricant can be used, if desired as a mixture with paraffinic wax, on sliding surfaces, particularly consisting of a polymeric material either porous or made porous.
Claims4
A solid lubricant consisting of solid perfluorocarbons prepared by dimerization or co-dimerization of linear or substantially linear perfluorocarbonsulphonyl halides of the formula C.sub.n F.sub.2n+1 --SO.sub.2 X, wherein X is halogen and n is a number less than or equal to 10, said solid perfluorocarbons having linear or substantially linear chains, with a number of carbon atoms ranging from 10 to 20, a melting point ranging from 50.degree. to 130.degree. C., and a critical surface tension ranging from 13 to 15 dyne/cm, which solid prefluorocarbons are dissolved in paraffinic waxes by means of a surfactant of the formula C.sub.8 F.sub.17 --CH.dbd.CH--(CH.sub.2).sub.5 --CH.sub.3.
Method for lubricating sliding surfaces, characterized in that a solid lubricant composition consisting of solid perfluorocarbons prepared by dimerization or co-dimerization of linear or substantially linear perfluorocarbonsulphonyl halides of the formula C.sub.n F.sub.2n+1 --SO.sub.2 X, wherein X is halogen and n is a number less than or equal 10, said solid perfluorocarbons having linear or substantially linear chains, with a number of carbon atoms ranging from 10 to 20, a melting point ranging from 50.degree. to 130.degree. C., and a critical surface tension rannging from 13 to 15 dyne/cm dissolved in paraffinic waxes by means of a surfactant of the formula C.sub.8 F.sub.17 --CH.dbd.CH--(CH.sub.2).sub.5 --CH.sub.3 is applied to the surfaces.
Dependencies are inferred from the claim text.