Compositions – Electrolytes for electrical devices
Patent
1986-08-05
1987-09-08
Garvin, Patrick P.
Compositions
Electrolytes for electrical devices
C10M10556
Patent
active
046922555
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a lubricating grease composition based upon a comparatively large proportion of mineral or synthetic oil as base oil and of a smaller proportion of polyurea as thickening agent.
It is known so to thicken lubricating-active mineral or synthetic oils by the addition of polyureas that they achieve the properties of a lubricating grease. The polyureas used in these lubricating greases are produced by the reaction of one or more monoamino- and/or diamino components, which can be aliphatic or aromatic, with diisocyanates, which can also be aliphatic or aromatic. Typical examples herefor are to be found in published Federal Republic of Germany Patent Applications Nos. 25 40 470, 26 04 342 and 26 04 343, as well as in published European Patent Application No. 31 179. The lubricating greases so obtained are adjusted, by the addition of additives, to the specially intended use of the grease, whereby high pressure additives, anti-wear additives and anti-oxidants are usually employed.
These greases have proved to be well suited for many purposes. In particular, they are suitable for comparatively high long-period temperatures of use as the lithium fats, with which admittedly most lubricating problems can be satisfactorily solved but only up to a maximum temperature of use in the region of 135.degree. C. With the polyurea-containing lubricating greases, this temperature limit could be increased into the range of 150.degree. to 160.degree. C.
However, for purposes of use under especially difficult conditions, the previously achieved long-term temperatures of use do not suffice. Therefore, a further increase would be desirable. Furthermore, in many cases, the stability of the polyurea thickening agent in the presence of the necessary additives, especially when it is a question of oil-soluble additives, proves to be unsatisfactory.
The problem forming the basis of the invention is to reduce or overcome these disadvantages of the previously known lubricating grease based on oil with polyureas as thickening agents.
According to the invention, this problem is solved by a lubricating grease composition based on a comparatively large proportion of mineral or synthetic oil as base oil and of a smaller proportion of a polyurea compound as thickening agent, as well as conventional additives, which is characterised in that as polyurea it contains the reaction product of an isocyanate with at least 3 isocyanate groups in the molecule with a long-chained aliphatic monoamine. The polyureas used according to the invention are cross-linked, high molecular products which have been mechanically comminuted. The amine component preferably consists preponderantly of the monoamines with 16 to 24 C-atoms but smaller proportions of monoamines with shorter chains down to 10 C-atoms can also be present, whereby, however, an amount of 10% of the total amine is not to be exceeded. In the same way, small amounts of diamines can be present, whereby an amount of about 5% is not to be exceeded.
By the expression "long-chained aliphatic monoamine" are to be understood compounds with more than 14 C-atoms, preferably those with 16 to 24 C-atoms and mixtures thereof. Longer chained monoamines are admittedly technically also usable for the invention but, at the moment, are economically only difficult to obtain.
The monoamine can be a saturated fatty amine or one containing one or more olefinic double bonds. There come into consideration not only straight-chained, branched but also cyclic aliphatic amines. Especially preferred in the case of singly unsaturated fatty amines are those with 16 to 20 C-atoms, still more preferred an alkenylamine with 18 C-atoms (oleylamine), on the one hand, as well as, in the case of saturated aliphatic alkylamines, those with 18 to 24 C-atoms, still more preferably with 20 to 22 C-atoms, on the other hand. Each of these preferred embodimental forms of the polyurea display special properties with regard to the compatibility with additives.
In this regard, further below it sill be dealt with in more detai
REFERENCES:
patent: 3015625 (1962-01-01), Rosscup et al.
patent: 3242210 (1966-03-01), Dreher et al.
patent: 3243372 (1966-03-01), Dreher et al.
patent: 3401027 (1968-09-01), Dreher et al.
patent: 3879305 (1975-04-01), Ehrlich
Matzat Norbert
Schreiber Hans
Garvin Patrick P.
Optimol-Oelwerke GmbH
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