Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic compound containing silicon
Patent
1997-06-16
1999-07-20
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic compound containing silicon
508582, 508588, 508589, C10M13108
Patent
active
059255994
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to lubricants based on silicone oils or silicone greases and to the use of an additive to improve their lubricating properties.
The silicone oils are colorless, water-white, oily liquids, which are distinguished by their special chemical stability. They are very resistant to oxidizing processes and also have many other advantages, such as and between 170 and 250 for heavy oils. The viscosity index determines the slope of the viscosity-temperature curve. Silicone oils are also distinguished by the fact that their viscosity changes relatively little as the temperature is increased, particularly in comparison with mineral oils. that, a low flammability. Silicone oils, particularly heavy oils, are practically incombustible. -100.degree. C. As a result, the limits to the use of silicone oils are unusually broad. solvents. introduced into the living organism without harm.
Despite these advantages, silicone oils or silicone greases have the disadvantage of that of a low lubricity. The lubricity of silicone oils is at the same level as the lubricity of water. The lubricity is expressed by the so-called weldability, which can be measured with the help of the four-ball machine. The weldability of silicone oils is only 80 kg or, in SI units, 80 daN. On the other hand, the weldability of engine oils is 170 to 200 kg and that of transmission oils is even 300 and higher. The latter data relates to the so-called EP oils (Extreme Pressure Lubricants).
In order to achieve these properties, mineral oils are improved with various additives.
Up to now, it has not been possible to improve silicone oils or silicone greases on the basis, on which other synthetic or natural mineral oils are improved, that is, by additives, because the typical additives, such as phosphate and thiophosphate esters, which are used successfully in other cases, do not dissolve in silicone oils or silicone greases. After all, it is a general property of silicone oils and silicone greases that almost no materials are soluble in them.
A first partial solution of this problem resulted from the chlorination of silicone oils. Chlorinated methylsilicone oils have not only improved but even outstanding lubricating properties. However, their stability is low and they tend to split off hydrogen chloride, which gives rise to an acidic reaction. A different possibility is the stabilization of chlorosilicones by means of epoxides, for example, in the form of glycidyl ethers. However, the chlorination of silicone oils, to a certain extent, is difficult, as is the de-acidification of these oils. The need for additional stabilization increases the costs of these silicone oils and complicates methods for improving them.
It is therefore an object of the present invention to provide lubricants based on silicone oils or silicone greases, which have particularly good lubricating properties and a high stability particularly in metal lubrication technology, in order to reduce the rate of wear of components that are to be lubricated and, with that, to increase their service life appreciably.
Pursuant to the invention, this objective is accomplished by a lubricant based on silicone oils or silicone greases, which is characterized by one oxygen atom in the sp.sup.3 configuration and are described by the general formula ##STR1##
As an organic compound, e.g., butylhemiacetal of chloral or 1,1,1-trichlor-2-methylpropanol-2 can be used.
In the above-described general formula, the following combinations of R substitutes are possible: ##STR2## R.sub.1 and R.sub.2 are cyclic acetals, such as (--OCH.sub.2 CH.sub.2 O--) or ##STR3##
In all cases, it is of advantage if, the silicone oil or the silicone grease is a methylsilicone oil or a phenylsilicone oil or a methylsilicone grease or a phenylsilicone grease.
The use of these additives as improving agents in the form of additives for silicone oils or silicone greases is simple and relatively inexpensive in production. Furthermore, it enables silicone oils to be obtained, which are suitab
REFERENCES:
Borek, J Some Chloral Acetals and Their Use in Lubrication. Proc. Conf. Synth. Labr. (1989), 69-73.
Tokarzewski, L. Trichloroacetic Ester Additive to Improve the Lubricating Property of Mineral Oils Inst. Chem. Technol., Univ. Katowice, Pol. Schmierung Sterchnik (1979), 10(6), 179-81.
Tokarzewski, L. Isooctyl Esters of Chloroacetic Acid as Additives Improving transmission-type Silicone Oils Dept. Chem. Technol., Silesian Univ., Katovice, Pol. Izv. Khim (1986), 19(1), 31-5.
Howard Jacqueline V.
Toomer Cephia D.
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