Compositions – Electrolytes for electrical devices
Patent
1994-04-20
1996-01-16
Howard, Jacqueline V.
Compositions
Electrolytes for electrical devices
252 58, C10M17100, C08J 309
Patent
active
054845440
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a lubricating composition, its preparation process and its applications, particularly as an additive in oils.
BACKGROUND OF THE INVENTION
The basic oils formulated by oil companies for use as lubricants are monograde oils. The majority of engines such as explosion, gasoline or diesel engines for cars for example, use multigrade oils.
Additives must be incorporated into these monograde oils to obtain multigrade oils after mixing.
These additives, insoluble or non-miscible in oils, are subjected sulphonation reactions in order to be solubilized in the oils to which they are added. With ageing, the oils release acids which corrode engines, more particularly stationary engines.
To avoid corrosion of engines, more particularly of stationary engines, it is thus necessary to increase the frequency of changes or to somehow protect the metal surfaces against corrosion by acids released from the oils.
Moreover, when engines remain unused for a certain period, numerous metal pieces dry out completely, i.e. there is no longer any lubricating fluid film between the metal pieces customarily in motion, and they are no longer lubricated at all at the start of the setting in motion of the engine and for a certain period; a metal-metal contact is then established.
It would thus be desirable to formulate a greasing oil avoiding the drying out of these metal surfaces or at least allow the coating of the metal pieces with a layer of solid lubricant serving as lubricant at the start of the setting in motion of the engine. Such a solid lubricant should also be fixed on the totality of the metal surfaces to be lubricated.
French patent application no. 2 359 200 describes a hybrid lubricant dilutable in a conventional fluid greasing oil, comprising a colloidal aqueous dispersion of polytetrafluoroethylene particles, a neutralizing and stabilizing agent, a carrier fluid lubricating oil incorporated in the stabilized dispersion to form with it an emulsion, which emulsion includes a dispersing agent and finally a wetting agent added to the emulsion and endowed with affinity vis-a-vis rubbing surfaces so as to predispose them to be impregnated by the said particles and fuse with them to form a superficial lubricating layer.
However, the hybrid lubricant uses an aqueous dispersion. The presence of water is prejudicial to the lubricating effect of oils, above all at the high temperatures where it is vaporized, involving difficulties of circulation in its circuit.
European patent no. 0 293 427 relates to a process for producing a dispersion of polytetrafluoroethylene for use as a lubricating oil or as an additive to the latter. In this process, a non-ionic surface agent is fixed to the polytetrafluoroethylene particles by heat treatment in several zones or stages of decreasing temperatures including a first zone at very high temperature, the first high temperature being prejudicial to the quality of the oil.
SUMMARY OF THE INVENTION
It would be desirable to have available a lubricating composition for use as a lubricating oil or as an additive to the latter in which particles of fluorinated (co)polymer would be fully miscible in the fluid in which they would be in stable suspension, without changing the basic characteristics, without fear of release or of decantation of the said particles in the fluid.
This is why the subject of the present application is a lubricating composition, characterized in that it contains solid particles of fluorinated (co)polymer of a size less than or equal to 1 .mu.m coated with an ethoxylated nonylphenol having 10-12 ethylene oxide molecules and in that it is substantially anhydrous.
DETAILED DESCRIPTION OF EMBODIMENTS
Preferred compositions according to the invention are compositions characterized in that the particles of fluorinated (co)polymer are coated with a stable saturating quantity of ethoxylated nonylphenol.
Among the compositions according to the invention, use is preferably made of those in which the fluorinated (co)polymer is pol
REFERENCES:
patent: 4127491 (1978-11-01), Reick
patent: 4806281 (1989-02-01), Huth
patent: 5160646 (1992-11-01), Scheld
Biro Guy Dion
de Bona Biro Renan
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