DE1214350B - High performance lubricant - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

Number:
File number:
Registration date:
Display day:

ClOm

German class: 23 c - 1/01

1214350
R25078IVc / 23c
March 3, 1959
April 14, 1966

Mixtures of mineral oils with salts such as lead naphthenate, Metal aurates or organic compounds with one or more atoms of chlorine, sulfur, selenium or known phosphorus.

Commercially available lubricants of this type often contain a chlorine derivative and a sulfurized one at the same time Derivative, since it was recognized that the suitability of each of these two groups was to protect against setting is reinforced by their simultaneous presence.

At maximum pressure, the chlorinated lauric acids and the tetrachlorinated butyric acids with a terminal CCl ₃ group and, as a sulfurized product, dibenzyl sulfide are used.

Tetrachlorobutyric acid with a terminal Cl _s group is produced in a number of successive process stages, so that the cost price is relatively high. While the high price is affordable in special applications, it excludes general use in lubricants.

It has now been found that using pentachlorobutyric acid of the formula

CCl ₃ - CHCl - CHCl - CO ₂ H

as an additive to mineral oils in amounts of 0.2 to 5%, a lubricant is obtained that has no friction Seizing also with extremely high loads such as an additive based on the allows mentioned tetrachlorobutyric acid together with a sulfur compound, with a further Wear of the rubbing surfaces occurs to a much lesser extent. It was also found that the Additive can be applied in a much smaller amount.

When using pentachlorobutyric acid, even with high loads, the addition of Sulfur compounds are dispensed with. This property is of particular practical importance since Sulphurous lubricants, despite their excellent properties, are in many cases not used as small amounts of sulfuric acids are formed, which cause corrosion.

When using sulfur compounds together with pentachlorobutyric acid, it is true still a noticeable reduction in wear, but even in the absence of the sulfur compound the wear is even lower than with known lubricants.

Another advantage is that the pentachloro is high-performance lubricant

Applicant:

Directed by Nationale des Usines Renault,

Billancourt, Seine (France)

Representative:

Dr. K. Griesing, patent attorney,

Hönebach (Hess.), Bahnhofstr. 9

Claimed priority:

France of March 6, 1958 (759 870),

dated October 20, 1958 (777 050)

butyric acid can be produced from cheaper raw materials and used in smaller quantities.

The pentachlorobutyric acid is in a known manner by the action of chloral on trichlorethylene in Presence of a catalyst produced.

The chlorinated product is used in amounts between 0.2 and 5%. Together with 1 to 5% However, 0.1 to 3% of dibenzyl sulfide is sufficient

The table shows the abrasion values according to Boer-age (Engineering, 136, p. 46, 1933) of pentachlorobutyric acid and tetrachlorauric acid or tetrachlorobutyric acid with and without dibenzyl sulfide. A are the abrasion values in millimeters at load B. D are the abrasion values with the introduction of the factor of load B by adding

D-

100

is converted. For the abrasion values D , the mean value is given for the entire load range as well as for loads from 600 to 800 kg.

Finally, the additive to be used according to the invention can add 0.2 to 5% methyl, ethyl, Propyl or isopropyl stearate, palmitate or behenate, individually or in mixtures in quantities 0.5 to 5% can be added, with the seizure being avoided without the risk of corrosion.

To explain the advantage of this particular embodiment, one can make the statement, that with the addition of 1% pentachlorobutyric acid and 1.5% methyl stearate to a mineral oil of

609 558/373

suitable viscosity a seizure in tests on the four-ball machine, even with a load of 800 kg cannot be reached, the abrasion diameter of the balls after an attempt by one Minute is not more than 1.90 mm for this load.

On the other hand, the weight loss due to corrosion of a sample made of soft steel, which was immersed for 24 hours in a mineral oil kept at a temperature of 100 ° C. and containing 1% pentachlorobutyric acid, 1.5% methyl stearate and also 1.7% water, was ten times less than that of a sample made from the same steel under the same conditions,. which in a ¹ . Mineral oil with: a content of only 2% pentachlorobutyric acid and 1.7% water was exchanged.

Comparative values Mineral oil 92%
Tetrachlorauric acid 5%
Dibenzyl disulfide 3% Yes
! ^D. after Boe rlage load
300 B in k
400 G
600 700 800 in the
middle Mineral oil 95%
Tetrachlorobutyric acid 2%
Dibenzyl disulfide 3% Yes
J ^D 100 140 B <
200 1.12
0.37 1.40
0.35 2.13
■ P, 36 3.17
0.45 3.63
0.45 0.44 ■ 1 Mineral oil 95% ''
Pentachlorobutyric acid 2% "
Dibenzyl disulfide 3% I ^A
J ^D 0.55
0.55 0.73
0.52 0.90
0.45 0.92
0.37 1.10
0.28 in the M]
1.56
0.26 ttel =
1.54
0.22 0.422
1.75
0.22 0.35 = 1 Mineral oil 98%.
Tetrachlorobutyric acid 2%
Mineral oil 98%
Pentachlorobutyric acid 2% 1 ^A
J D
1 ^A
J D 0.52
0.52 0.72
0.51 0.75
0.38 0.84
0.28 0.98
0.25 in the M
1.26
0.21 ttel =
1.31
0.19 0.233
1.59
0.20 0.31 0.56
0.56 0.62
0.44 0.68
0.34 1.11
0.37
1.13
0.38 1.24
0.31
1.26
0.32 in the M
verse
MiJ
W.
1, -49
0.25 ittel =
because
idestw
ie at
1.59
0.23 0.198
3ung
erte
A.
1.72 '
0.21 0.37 '{ 0.58
0.58
0.62
0.62 0.68
0.49
0.75
0.54 0.84
0.42
0.90
0.45 mean = 0.2296

40

Claims (2)

Patent claims: 1. Use of pentachlorobutyric acid of the formula Cl ₃ C - CHCl - CHCl - COOH as an additive to lubricants based on mineral oil in quantities of 0.2 to 5% 2. Use of pentachlorobutyric acid according to claim 1, in amounts of 0.2 to 5% together with 0.5 to 5% of methyl, ethyl, propyl or isopropyl stearate, plamitate or behenate individually or in a mixture. .3. Use of pentachlorobutyric acid according to claim 1 in amounts of 0.1 to 3% together with 1 to 5% dibenzyl sulphide. Considered publications:
German Patent No. 952 925;
French patent specification No. 1145 476,1137 637