DE1963921A1 - Lubricating oil mixture - Google Patents

Description

Lubricating oil mixture

The present invention relates to a lubricating oil blend, which can withstand great mechanical and thermal loads.

High mechanical and thermal loads occur in particular in racing cars whose engines are at a high Xom ~ pression are operated, and their mechanical parts often varied, rapid acceleration and intense and are subjected to relatively long periods of stress, thereby accelerating the decomposition of the lubricating oil.

So far, oils have been used for racing cars and other hot-working vehicles that are exposed to comparable mechanical and thermal loads, which contain castor oil either alone or in a mixture with a mineral oil or an ester base oil, which is mixed with a viscous mineral oil, for example

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wise a so-called "bright stock solvent", thickened was.

The previously known oil blends have the disadvantage that they are quickly oxidized and prone to deposits and thereby clogging of the lubricating oil openings allow »so that the oil circuit or the drain is obstructed. The other oils have the drawbacks that originate from the viscous mineral oil, i.e. that »ie under others have poor low-temperature properties and are prone to carbon deposits.

Surprisingly, it was found that it was possible is to create a lubricating oil solution which is available under etfcr No mechanical and thermal stress shows the previous disadvantages when riding an ester green oil a polyisobutene of preferably low molecular weight and a fluid mineral oil mixed.

Ale Beter base oils can, for example, be dioethyl or Didecyl adipate, azslate or phthalate or pentaerythritol toltetraheptanoate can be used.

The molecular weight of the polyisobutene should be preferred

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be in the range from 1000 to 4000.

The mineral oil is preferably a refined oil with a ^{viscosity measured at 37 * 8 0} C in the range of 20 to 10 / and preferably 25 to 45 cSt.

The individual components of the 01 mixture according to the invention can preferably be in the following amounts:

? 0 to 70 Qew. £ Ester Oil 5 to 20 weight percentages of polyisobutene

65 to 10 weight pounds of mineral oil based on the overall composition.

The oil mixtures according to the invention have excellent stability without the use of antioxidants or need additives to prevent wear. Of course, these oil blends can be used with certain additives if necessary.

example

Ea five oil blends were prepared according to the following composition, the first four oil blends A # B »C and D correspond to the present invention,

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while the five oil mixture 3 serve as Yergle.iohsiJl.

Compositions Qew.ji) A. Ootylaselate 40 Didecyl adipcite - Pentaerythritol tetrehepta-
noate QeradkettißGS Aliroholphtha «
lat Mineral oil ("52 c8t * at _Λ
37.8 ° C) 46 Polyisobutene with; one
Molecularly elected from 2700 14th Bright Stock ßoli '& nt

17th
15th

I) E. - JJ 21 em 16 «·. 67

Characteristics:

"Ι ι Ii i" Mii ITi ι β a * ^ - ^ = - rai_r

f.?

Viscosity at 17.0 C in

Poise

Stop point in C A I B
—F

19 ^>
1 & -39 «18

0.95

23 * 8

nsoh Con - 0,0 ^ ij 0,0i ·· --J _t r> ^ i '> ,, € radson in # F | ^ 'i' 5

eSitre number in mgKOH i * i st

irt in ° C

SAE Orad

0.05

I »

12.46

85 18

£ 48

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The viscosity at 17.8 C corresponded to the working conditions of an oil in a cold oil pan; the flash point was determined on an open vessel. The table clearly shows the advantages in terms of viscosity when cold Conditions and regarding the Conradson carbon number.

The oil blends were also similar to their Oxydationsbestän-

diness examined »where 400 g of the respective oil sample

200 hours were heated to 160 ° C, with 10 liters

Air per hour were blown through. After j52,

50, 100, 150 and 200 hours each 50 ml oil sample taken and after 200 hours the following results certainly:

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A. B. C. D. E. P. Relative vis
increase in efficiency
In-Jl.
measured Vis
kosity at
98.9 ° C in 08t 9 7th 18th 10 12th 36 Increase in
Acid number in
ragKOH g 2.7 3.5 1.3 3.5 2.8 4.8 Increase in
Conradson number
in % 0.57 0.18 0.73 0.20 0.7 2.5 Sedimentation
at centrifu
yaw 3 tracks traces traces traces traces 2

The commercially available 01 F consisted of a mixture of Ester oil and mineral oil with inhibitor. The values of the table clearly show that the oils according to the invention are particularly resistant to oxidation and leave no deposits, it being noteworthy that these oils do not penetrate any additives had to be inhibited.

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The mixtures of the invention were further subjected to mechanical Belastungsverauchen by passing the heated to 70 ⁰ C Ol 50 hours by a öleinspritzvor "rlohtung with a Singangsdruok 250 ATU. The drop in viscosity of the oil after this test was determined and was negligible in all cases.

To determine the wear properties of the oil mixtures according to the invention, the wear and tear of the crankshaft bearing in a Peugeot 204 engine after 500 hours of running and an oil temperature of 100 ° C. was determined. This wear was determined in percent / related to the worn surfaces at θ bearing points. The oil according to the invention was used here. Mixture B, and a commercial oil examined, with the erfindungsge mäfien oil a code number of 62 S <and with a commercial oil a code number of 100 % was obtained, while a visual inspection of the worn parts with the invented oil and barely recognizable markings commercial oil resulted in considerable damage to 5 valve tappets · ..

To the corrosion preventive properties of the fiction According to the mixtures to determine, 200 g of oil with a

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Without water. Heated for 48 hours to 100 ° C. in the presence of a copper plate and a bearing made of an aluminum-tin alloy. The Mfit al! Surfaces were additionally polished. It was found that with the oil according to the invention both the copper plsts and the bearings were clean, while when the copper plate was treated with the commercial oil, the formation of a layer of flakes and a slight formation of flakes could be observed in the bearing.

Furthermore, in the mixtures according to the invention under " searches whether it is running at low speed or at Repeated short operation show sludge formation. Here, a Sicwa 1000 motor vehicle was selected from among the following Conditions driven:

Try expensive Qeeo speed load Water ^ oiled in minutes t / Hin Lemperatur temperature 5 1500 0 30th 30th 55 600 0 30th 30th 120 2800 full at. 30th 30th 120 3 * 00 full at. 85 90 60 Stop «= ■ 20th 20th

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After 10, 20, 50 and 40 passes, the sludge collected in the centrifugal filter was weighed and the following values were obtained :

Ol B Mineral oil with detergent 10 runs
20 passes
50 runs
Ί0 passes 4th
9
20th 10
18th
29

These values show that the oil B according to the invention behaves almost exactly in the same way as a commercial 01 with inhibitor additives.

Claims (6)

ίο ~ Expectations ,. \ Sehmierölmisohung, characterized in that they contains a synthetic ester base oil, a polyisobutene and a fluid mineral oil. 2. Mixture according to claim 1, characterized in that the synthetic ester oil is a dioctyl or dideoyladlpat, azelate or phthalate. 3. Mixture according to claim 1, characterized in that the synthetic ester oil is a pentaerythritol tetraheptanoate is. 4. Mixture according to claim 1 to 3 »characterized in that the mineral oil is a refined UI with a ^{viscosity measured at 37» 8 0} C of 20 to 130 cSt, and preferably 25 to 45 cSt. 5. Mineral oil mixture according to claim 1 to 4, characterized ge « indicates that it consists of 30 to 70 wt. 5 to 20 wt. £ polyisobutene and 65 to 10 wt. 56 Mineral oil. 6. Mixture according to claim 1 to 5 »characterized in that the polyisobutene has a molecular weight between 1000 and 4000 owns. 009028/1622