DE865340C - lubricant - Google Patents

Description

In order to produce an effective liquid synthetic lubricant, it is well known that to use a product that has the desired viscosity properties and to that product add a small amount of suitable active molecules. These polar molecules adhere then preferably on the contact surfaces and form a skin in the plane of which the lubrication phenomena take place. Such a mixture So it ensures hydrodynamic lubrication due to its viscosity and has the desired one Slipperiness that is given to it by the active molecules. In this way numerous Types of lubricants are made.

In the series of phosphoric acid esters of phenols, only tricresyl phosphate has so far found industrial use. This compound has valuable properties, but it has the disadvantage that it has a relatively low viscosity. The viscosity of this body at 35 ° is about 30 centistokes at 50 ⁰ about 15 centistokes.

The patent proprietor has now found that another phosphoric acid ester, namely trixylenyl phosphate

CH, _χ

po,

possesses the required properties of a lubricant and at the same time a considerably higher one

Has viscosity than the above-mentioned body.

The viscosity of this body at -35 ° is namely about 53 centistokes and at 50 ⁰ about 23 centistokes.

This liquid must be as pure as possible in order to ensure good stability. She can do anyone obtain suitable addition of lubricity enhancers. So can excellent mixes that are suitable for lubrication in precision mechanics, among others. have the following compositions:

Mixture A: trixylenyl phosphate .... 95 parts

Olive oil, neutral .5

Mixture B: trixylenyl phosphate .... 97 beef nectar oil / neutral,

cold nitrided - 3 -

In certain watchmaking applications, for example, it is necessary that -a is applied to the friction surfaces (tenons, spiral screws, etc.) Lubricating oil does not spread and does not escape by overdrawing the discs; rather it must clustered and concentrated in caps on yours. Points remain where the lubricant drop is brought to. We now know that the reason for that Propagation of the oils consists in the fact that the cohesion of the oil molecules, i. H. so the mutual attraction of these molecules, is surpassed by the attraction of these molecules by that of the surfaces "of the Solids (disks, axles, etc.) caused force *, fields.

. .Ea.istnuriie ^ tgesislli.w ^ qrden ^ that. das.TjrjxyJenyi ^. phosphate, if this is very pure, as must be the case for the stated purposes, does not have sufficient cohesion to withstand a more or less substantial spread.

According to another feature of the invention this disadvantage can be eliminated by adding a very small amount of to the trixylenyl phosphate particularly active molecules, such as those of a fatty acid, even an unsaturated fatty acid, a phenol or a long chain alcohol. These molecules considerably increase the cohesion, and as a result, the lubricant drops no longer have a tendency to settle on the solid surfaces spread out. The means given below, for example, are fully sufficient:

Mixture C: trixylenyl phosphate .... 94.5 parts

Olive oil, neutral 5

Oleic acid, redistilled ..

Mixture D: trixylenyl phosphate ... 96.3

Beef claw oil, neutral,

· .-- ■: cold filtered 3

Elaidic acid 0.7

Mixture E: trixylenyl phosphate ... 94

Olive oil, neutral 5

^; .Alcohol with 18 C 1

"One can also use the trixylenyl phosphate according to the invention use in a mixture, for example to adjust the viscosity of the tricresyl phosphate or one or of several other organic phosphoric acid esters.

Claims (1)

PATE NTANS PRXT CH: _- "-Use of trixylenyl phosphate for itself or together with small amounts of fatty oils, higher molecular weight fatty acids, fatty alcohols, Phenols or one or more other organic phosphoric acid esters as lubricants in precision mechanics, especially as watch oil. 1 5682 1.53