DE1279269B - Lubricating oil - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN S / jffiTWi · PATENT OFFICE Int. CL:

ClOm

EDITORIAL

German class: 23 c -1/01

Number: 1279 269

File number: P 12 79 269.7-43 (R 26750)

Filing date: November 18, 1959.

Open date: October 3, 1968

From French patents 1050 806, 1145 476 and 1193 094 and the German patent specification 1214 350 high-performance lubricants are known, which are made from mineral oil with an addition of Tetrachlorauric acid or Tetrachlorobutyric acid or else also von-pentachlorobutyric acid, ■ optionally together with an addition of esters of higher fatty acids. With these lubricants it has However, it has been found to be disadvantageous that they under normal average loads, at least with which an oil film of pure mineral oil would be pushed aside and therefore the addition of fat + acidic products as an adhesive, unevenness in the lubricating effect occur, so that these funds are not universally applicable.

From the German patent specification 1041624 it is furthermore known, esters of long-chain fatty acids together with esters of tetralauric acid mineral oils admit. But even such lubricants do not yet meet the requirements required today.

It has now been found that significant improvements have been made Lubricant is obtained by using a lubricant made from a mineral oil and 0.05 to 2% Stearic, palmitic or behenic acid or their esters with 1 to 3 carbon atoms in the alkyl radical still 0.2 to 3% of the methyl or ethyl ester of pentachlorobutyric acid of the formula

CCl ₃ - CHCl - CHCl - COOH

clogs. ,

The required methyl or ethyl pentachlorobutyrates are in a known manner by immediate Esterification of pentachlorobutyric acid with an lubricating oil

Applicant:

Directed by Nationale des Usines Renault,
Billancourt, Seme (France)

Representative:

DipL-Ing. C.H. Huss, patent attorney, '

8100 Gapnisch-Partenkirchen ^ Rathausstr. 14th

Claimed priority:

France of November 21, 1958 (779 796)

Ghlorgas saturated methyl or ethyl alcohol obtained.

ao The lubricant according to the invention ensures sliding at maximum pressures without seizing like the lubricants according to the prior art, and it also has a lower coefficient of friction in the lubricating area, which remains stable over a wide temperature range at medium pressures and also compared to the lubricant according to the German patent 1041624 loses its stable lubricity only at significantly higher temperatures. In addition, the lubricant according to the invention has an unusually low corrosive effect on steel. ; Table I shows results which were determined with the device from Bberl'age at pressures between 250 and kg / mm ² .

Tabel! mineral oil
+ l ° / oPenta- ..-
chlorobutyrate
* 0.5 per cent stearin
acid ■ / -
mineral oil
+ lo / o methyl
^ teärat -, }, · - / ■ -
mineral oil
+ 0.5%> stearin
acid . "■ - ¹ V- ¹ I ¹ i
mineral oil
pure mineral oil
. + l% penta \,
chlorobutyrate - ^r *
+ 1% methyl,
stearate 80
110 70
95 60
- 90 60
80 Highest pressure without seizing,
kg / mm ² .;,. 80
120 Lowest pressure when suddenly
Seizure, kg / mm ²

The addition of methyl pentachlorobutyrate to mineral oils in conjunction with stearic acid or the Methyl ester of stearic acid significantly improves the resistance to seizing when abnormal high pressures.

809 619/536

In the tables are the coefficients of friction and their mean deviations, measured by means of the Her schell device, at various Temperatures.

1.Pure vaseline oil 98%

Methyl pentachlorobutyrate 1%

Methyl stearate ... 1%

2. Vaseline oil 98,5 ° / o

Methyl pentachlorobutyrate 1%

Stearic acid 0.5%

3. Pure petroleum jelly

4. Pure vaseline oil with 5% commercial additive for high pressure oil

TabeUeH

20th 0.114 50 Temperatures 100 0.160 + 0.043 0.107 115 0.130 + 0.008 0.153 + 0.007 ⁰ C 0.100 ± 0.008 0.151 + 0.007 0.128 + 0.005 + 0.007 75 0.142 + 0.013 + 0.014 Mixture 1 0.180 ± 0.020 0.174 0.110 ± 0.008 unstable area
with very strong deviations Mixture 2 0.148 + 0.018. + 0.019 0.142 ± 0.008 0.151 + 0.027 - Mixture 3 Mix 4

In the case of mixture 1, the coefficient of friction remains extremely weak, and it remains very weak in the case of Mix 2, even at temperatures of 115 ° C, 'in complete contrast to mixtures 3 and 4, which have a high coefficient of friction and show a strong scatter at normal temperature.

It is particularly noteworthy that in the invention Mixture 1 still shows no significant fluctuations in the display of the coefficient of friction even at temperatures of 100 and 115 ° C appear. This is in contrast to German patent specification 1041624. From FIG. 7 This patent specification clearly shows that even at 100 ° C. there is a split in the coefficients of friction found values takes place in two branches of the curve. So at a temperature of 115 ° C not only the coefficient of friction of 0.120 when using TetracMorlauric acid methyl ester (1%) with methyl stearate (1%) to 0.107 when using methyl pentacate (1%) with stearic acid methyl ester (1%) reduced, special the temperature limit of 100 ° C at which the Instability of the coefficient of friction begins with the first-mentioned lubricating oil is in the case of the invention Lubricant increased by at least 15 ° C. The lubricants according to the invention are suitable preferably for the lubrication of explosion engines during the running-in period and for the permanent lubrication of transmissions, gear boxes, for conical couplings.

Table ΙΠ

Comparative values of the fluctuation range

the coefficient of friction in the Herschell device

at 15 kg / mm ² average contact pressures.

Vaseline oil was tested with 1 percent by weight each

of the specified additives. St. = methyl stearate.

Fluctuation range at 75 ° C Additives the coefficient of friction 0.15 to 0.19 at 20 ° C 0.23 to 0.25 Tetrachlorauric acid .. 0.15 to 0.19 Tetrachlorobutyric acid .. 0.21 to 0.23 0.23 to 0.25 Tetrachlor 0.21 to 0.28 butyric acid + St. .... 0.27 to 0.32 Pentachlorobutyric acid. 0.17 to 0.23 0.20 to 0.23 Pentachlor butyric acid + St. ... 0.18 to 0.25

In all cases the ball runner block gets into strong oscillation and this also shows the insufficient oscillation Lubricity in this load range.

Table IV

Comparative values of the coefficient of friction in the Herschell device for lubricants according to German patent 1041624 at 15 kg / mm ² contact pressures depending on the temperature for the following additives:

• \ .. A = 1% methyl tetrachloroate + 1% methyl stearate B = 1% methyl pentachlorobutyrate + 1% methyl stearate

20 ° C Rubs
50 ° C ing coefficient
75 ° C sn at
100 ° C 115 ° C Additives 0.120
0.130 0.120
0.114 0.115
0.110 0.110 *
0.100 1.120 **
0.107 A. B.

The value marked with * 'is at the beginning of an instability.

The value marked with ** indicates the maximum value of a strong instability of fluctuating friction coefficients.

Claims (1)

Claim: acid of the formula CCl ₃ - CHCl - CHCl - COOH Lubricant containing and containing a mineral oil. 0.05 to 2% of stearic, palmitic or behenic 5 acids or their esters with 1 to 3 carbon- Considered publications: atoms in the alkyl radical, thereby identified- German Patent No. 1214350; records that it is an additional 0.2 to 3% of French patent specification No. 1098408; Methyl or ethyl esters of pentachloro butter - British Patent No. 784 896.