DE615562C - Lubricating greases - Google Patents

Description

Greases Greases (also called consistent greases) like them z. B. for transmission gears, differential gears and similar devices are needed, and which mostly contain water and soap, are sometimes used hard and rigid at relatively low temperatures.

It has now been found that the plasticity and flowability of lubricating greases at low temperatures is significantly improved if you give them synthetic Products added by treating hard or soft paraffin or their derivatives or montan wax or substances containing these in considerable quantities, such as petrolatum, Slack wax, vaseline, crude lubricating oils containing paraffin and the like with high tension, appropriately high-frequency electrical currents are available.

Particularly suitable starting materials for the production of the synthetic products are paraffins or derivatives thereof with a molecular weight greater than Sao, suitably greater than 350 , and expediently a boiling point greater than 300 ° in a high vacuum, such as, for example, ceresin, ozokerite, hatchettin or montan wax or other waxes, tallow, wool fat, mineral fats or mixtures of these with low molecular weight paraffins or hydrogen-rich oils .

You can do the electrical treatment with the addition of cyclic Hydrocarbons or derivatives thereof, such as naphthalene, tetrahydronaphthalene, Decahydronaphthalene, or naphthol, substituted phenols and the like, advantageously such of higher molecular weight, such as phenanthrene, anthracene, oxyanthracene or of Condensation or polymerisation products of low molecular weight hydrocarbons, carry out.

The electrical treatment can also be carried out in the presence of gases or vapors, such as hydrogen, nitrogen, hydrogen halide, halogens, gaseous, saturated or unsaturated hydrocarbons and the like. The usage foaming agents such as saponin, sulfonic acids and their salts, high molecular weight Fatty acids, like oleic acid, are beneficial. Furthermore, substances such as active charcoal, active silicic acid and the like be present, or metal oxides such as zinc oxide, cadmium oxide, Molybdenum oxide, walfram oxide, chromium oxide or halogen compounds of metalloids, such as sulfur, phosphorus, boron and the like, or of metals, like copper, Silver, magnesium, vanadium, molybdenum, tungsten, chromium, nickel, cobalt and the like, or organic halogen compounds of benzene, toluene, xylene, naphthalene and methyl, Ethyl, methylene, ethylene chloride, iodide or bromide.

The duration of the treatment depends on the nature of the Raw materials. Low molecular weight paraffins, e.g. B. ordinary soft or hard paraffin, Petrolatum or the like, require a longer treatment time than high molecular weight paraffins, such as B. with ceresin or a mixture made from paraffin and ceresin.

In general, it is expedient to add 0.5 to 5% of the synthetic oils obtained to your zti-improving grease, but larger amounts, for example 10, 20 or more, can also be used. In the case of lubricating greases that are not used under extreme conditions, an addition of less than 2%, for example 1 ° 1a, may be sufficient.

The synthetic products can either use the lubricating greases for themselves or in a mixture with metal soaps, - such. B. lead, sodium or aluminum oleate or stearate or with other substances, such as condensation products, of high molecular weight organic acids, oxidized, extremely boiling oil distillates and the like added will.

The lubricating greases produced in this way have a low temperature better flowability, less frictional resistance, greater lubricating effect, can be pumped more easily and provide better switchability at low temperatures of the transmission than the original fats.

When used as gear grease, the gears are less worn and the temperature of the gear housing is not increased urine.

Example zoo g hard paraffin are melted and in a vacuum from 5 rinn Hg column with silent electrical discharges of 7,000 volts and 4,000 Hertz treated. After a period of 9 hours, a vaseline-like soft one is obtained Product which consists of 70 0lo of a highly viscous lubricating oil. Dev rest is unchanged Paraffin, which is driven off by the oil. Of this lubricating oil, 5 ° 1o become a gear grease mixed in. This ensures that the gear grease at a low temperature remains soft or fluid, which increases the lubricity and the shiftability of the transmission is facilitated.

Used as a raw material for .the electrical treatment A mixture consisting of hard paraffin and ceresin in the ratio i: i and processed it under the conditions given above is sufficient to achieve the same Effect an addition of 2 110 to the aforementioned gear grease.

In addition, the grease film has a special nature in this respect when it ruptures under much higher pressure than when using lubricating grease without the claimed addition.

It is known that hard or soft paraffin is silent electrical discharges and the products obtained in this way are lubricating oils add, which lowers the pour point and the temperature viscosity curve the oils are flattened. When adding these products to lubricating greases in accordance with However, the present invention goes beyond the effect achieved with lubricating oils. as can be seen from the advantages listed above.

Claims (1)

PATRNTANSPRUCIi lubricating grease, characterized by a content of synthetic products made by treating hard or soft paraffin, their Derivatives or montan wax or substances containing them in considerable quantities are available with high-voltage, expediently high-frequency electrical currents.