DE1594328A1 - Mineral lubricating oil - Google Patents

Description

PATENT LAWYERS

DR-ING. BY KREISLER DR.-ING. SCHDNWALD DR.-ING. TH. MEYER DR. FUES DIPL.-CHEM. ALEK VON KREISLER DIPL-CHEM. CAROLA KELLER DR.-ING. KLOPSCH

KOLNI ₇ DEICHMANNHAUs

Cologne, November 25, 1969 Ke / Re

Antar Petroles de 1'Atiantique, 4 Rue Leon Jost, Paris / France

Mineral lubricating oil

The invention relates to a liquid mineral lubricating oil for gear ratios, in particular for gears, Gear drives and motorized lifting cranes.

It is known to improve the lubricating properties of lubricating oils which are exposed to high pressures, concentrates of molybdenum disulfide or graphite, which are usually commercially available in the form of doses im Case of the lubrication of gears directly in the gear housing in relation to that already in it amount of oil are introduced, with the movement or shaking only after a certain number of operating hours the full effectiveness of the mixture is guaranteed.

It is also known to use molybdenum disulfide or graphite separately as an additive or to incorporate them into lubricating oils or greases before use. In addition, a mixture of graphite and molybdenum disulfide has been proposed as an additive to highly stressed gear oils. 009830 / U6S

It is also known to use so-called "extreme pressure additives" for production of oils for gearboxes and lifting cranes. These additives used as such have in presence certain disadvantages of moisture or accidental ingress of water.

All of these additives have the disadvantage in common that their correct use is difficult because they do one exact dosage is required at the moment of use, and that its effectiveness only after one certain running time of the machines is unfolded.

The disadvantages mentioned are eliminated by the invention. The lubricating oil according to the invention unfolds immediately its full effectiveness and therefore makes all special oils or special additives superfluous for the start-up time.

The mineral lubricating oil according to the invention consisting of mineral oil and, based on 100 parts by weight of the mineral oil, 0.5 to 5 % dispersant and / or viscosity index improver, 6 to 10 % maximum pressure additive to 0.2 to 15 % compound additive, 0, 2 to 1 % molybdenum sulphide and 0.02 to 0.05 % synthetic graphite, the molybdenum sulphide and the graphite having already been added during the production of the lubricating oil.

In this lubricating oil, the proportions of the base oil and the additives are chosen so that a state of equilibrium is achieved between the mineral base oil and each additive, as well as between the various additives.

Known methacrylic acid ester polymers are preferably used as dispersants having the appropriate viscosity index with a molecular weight of 8,000 to 15,000, which is obtained by copolymerization of dodeoyl methacrylate and N-

009830 / U65

Diäthylamlnoäthylmethacrylat in the ratio of 90 to 10 wt -.% Was obtained.

A known mixture of 20% zinc alkyldithiophosphate in chlorinated paraffin, the chlorine content of which is approx. 37 % , is advantageously used as the maximum pressure additive.

A mixture of 50 % saponifiable oil, which has been subjected to corpuscular radiation using the electrion method, and 50% mineral oil or another equivalent product is used as a compound additive.

The above-mentioned quantities of graphite are used as solid lubricants, 95 % of which have a size of Iu or less and 5 % a size between 1 and 5W, and molybdenum disulfide, 95 % of which has a size of 0.5A * or less and 5 % less than Iu in size. The molybdenum disulfide must be purified to such an extent that every trace of silicon dioxide is removed and it is ensured that there is no acidity whatsoever, the p ^ value of the molybdenum disulfide should be between 6 and 8.

The graphite used must be absolutely pure, such as the currently synthetically produced graphite. The amounts used within the stated range depend on the particle size of the molybdenum disulfide and Graphite. The molybdenum disulfide and the graphite can be added to the oil as such. In practice it is However, advantageous in the preparation of the invention Lubricating oil to the base oil are commercially available concentrates of molybdenum disulphide and graphite, which may be contain stabilizing additives and additives to prevent flocculation.

009830 / U65

For example, one can admit:

The molybdenum disulphide in the form of a concentrated colloidal dispersion in a petroleum fraction,

the graphite in the form of a concentrated colloidal DI Persion of pure graphite in a petroleum fraction

A lubricating oil according to the invention has, for example, the following composition using the aforementioned be preferred additives:

Quality mineral oil 100 parts by weight and, based on the mineral oil, Viscosity index improver 1 % High pressure additive 7 % Compound addition 2 * MoS ₂ 0.5 % Graphite (synthesized) 0.025 %

The liquid lubricant according to the invention offers numerous advantages which have long been realized was sought in vain. For example, this lubricant makes it possible to reduce the running noise of the gears to reduce and even to suppress · It absorbs pressures and is stable at temperatures that were previously were not allowed. It lowers operating temperatures and preserves its viscosity and other original Properties over time that were previously unknown in practice.

Systematic tests were carried out in the laboratory with the four-ball tester, the Timken oil testing machine and with the testing machine of the Service Technique de la Marine to determine the wear (or the diameter of the Indentation with the four-ball tester) and the pressures at which scuffing and welding occur.

009830 / U65

Exceptionally good results have been obtained in these experiments.

Tests were also carried out under practical conditions. Here it could be determined!

a) a considerable perceptible even to the untrained ear Noise reduction,

b) Disappearance of the pitting (or hole formation) on certain parts that have to withstand high pressures (especially with the power transmission ("pont a vis") of the vehicles "Peugeot 4θ3 and 4o4"),

c) great smoothness of the gearbox: easier shifting of the gears, the difference being the main one in extreme cold (-20 ° to -30 ° C during winter 1962/1963) is perceptible ^;

d) Reduction of the friction, recognizable by the lower temperatures of the gearbox after the same load (ambient temperature 30 ⁰ C on the motorway) ί

Usual ultra high-pressure lubricating oil according to the invention

"Peugeot 4o4" 125 ° C 115 ° C

and an increase in the output of the gearbox, which is expressed in an increase in the maximum speed.

009830/1465

Claims (1)

Claim Mineral lubricating oil for gear ratios, consisting of mineral oil and, based on 100 parts by weight of the mineral oil, 0.5 to 5 % dispersant and / or viscosity index improver, 6 to 10 % maximum pressure additive to 0.2 to 15 % oil compound additive, 0.2 up to 1 % molybdenum sulphide and 0.02 to 0.05 % synthetic graphite, the molybdenum sulphide and graphite already being added during the production of the lubricating oil. 009830 / U65