DE1247525B - Ester lubricating oil - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN wfäSsk PATENT OFFICE Int. Cl .:

ClQm

EDITORIAL CfOM TBTTO O B 4 2

German class: 23 c -1/01

Number: 1247525

File number: S 89591IV c / 23 c

Filing date: February 1, 1964

Auslegeta.g: August 17, 1967

Lubricating oils based on aliphatic carboxylic acid esters, which are used to improve their pressure absorption capacity Triaryl esters of phosphorothionic acid are added as a so-called high-pressure additive, are off the journal "Lubrication Engineering" (August 1952), p. 179, Table III, known. The addition relative Large amounts of such phosphorothionic acid esters are out of the question for reasons of cost alone, among other things.

From German Patent 1,067,553 it is also known that chlorinated di- or polyphenyls as High pressure additives for diester oils can be used.

When using chlorinated polyphenylene as a high-pressure additive, however, there is an increase in Insofar as the pressure absorption capacity of the lubricating oil is set relatively narrow limits, as the increase is not proportional to the amount of chlorinated polyphenyl added, but with an increasing amount added drops rapidly.

It has now been found that there are particularly advantageous effects with regard to the pressure absorption capacity of a lubricating oil based on aliphatic carboxylic acid esters can be achieved when using phosphorothionic acid esters in combination with chlorinated polyphenylene.

The invention thus provides a lubricating oil based on aliphatic carboxylic acid esters, which thereby is characterized in that there is a chlorinated di- or polyphenyl in combination with at least one Chlorine substituents in each benzo nucleus and a triaryl ester of phosphorothionic acid with 6 to Contains 10 carbon atoms in each aryl radical.

Aliphatic carboxylic acid esters as lubricating base oils are well known. The following are used here:

Esters of monohydric alcohols with 3 to 18 carbon atoms in the molecule with monobasic, aliphatic acids with 4 to 18 carbon atoms in the molecule, e.g. B. isodecyl pelargonate; Diesters of dibasic carboxylic acids having 6 to 20 carbon atoms with monohydric alcohols having 1 to 12 carbon atoms, e.g. B. Esters of adipic, pimelic, suberic, azelaic and sebacic acid with lauryl, heptyl, octyl and nonyl alcohol, or 2,2-dimethylpentanol, 2,2,4-trimethylpentanol, 2,2,3-trimethylpentanol, 2,2-dimethylhexanol and 2-methyl-2-ethylhexanol.

Complex esters of an aliphatic dicarboxylic acid and a glycol or polyglycol, the Esterification is useful in the presence of an alipha ester lubricating oil

Applicant:

Shell

International Research Maatschappij N.V.,

The hague

Representative:

Dr. E. Jung, patent attorney,

Munich 23, Siegesstr. 26th

Named as inventor:

Alexander Colquhoun

Barr Macphail, Little Sutton, Cheshire;

Francis Terrance Barcroft,

Upton-by-Chester, Cheshire;

Charles Buchan Milne,

Little Sutton, Cheshire (UK)

Claimed priority:

Great Britain February 21, 1963 (7013) - -

tables monocarboxylic acid and / or an aliphatic monohydric alcohol is carried out, for. B. Ester of the formula

R ₂ OOCR ₁ COOROOCr ₁ COOR ₂

in which R is an alkylene or oxyalkylene group, R _{1 is} an alkylene group and R _{8 is} an alkyl group, is obtained by esterification in the presence of 2 mol of a monohydric aliphatic alcohol.

Mixtures of the esters described can also be used.

The chlorinated di- or polyphenyls used as extreme pressure additives in the lubricating oils according to the invention can be defined as diphenyls, terphenyls, higher polyphenyls or mixtures of such compounds in which each benzene nucleus is substituted by at least one chlorine atom.
These compounds contain no elements other than carbon, hydrogen and chlorine and no core substituents other than the alkyl radicals and chlorine atoms. The chlorinated di- or polyphenyls are commercially available

709 637/606

available. These compounds containing at least 40 weight percent chlorine are for use suitable in lubricating oils according to the invention. However, they should preferably contain up to about 70 percent by weight of chlorine contain.

The chlorinated di- or polyphenyls can be used in concentrations between 0.5 and 10 percent by weight and preferably between 1 and 6 percent by weight, calculated on the finished lubricating oil.

Examples of suitable triaryl esters of phosphorothionic acid are triphenyl phosphorothionate, tritolyl phosphorothionate, Tribenzyl phosphorothionate and trixylyl phosphorothionate. Triphenyl phosphorothionate is the preferred esters.

These triaryl esters can be used in concentrations between 0.5 and 10 percent by weight and preferably .between 1 and 6 percent by weight, calculated on the ■ finished lubricating oil, can be used.

The lubricating oils of the invention can also contain any other known additives for aliphatic Carboxylic acid ester lubricating oils contain, like thickeners and antioxidants, the formation of varnish preventive agents, anti-foaming agents, dyes, anti-corrosion agents, metal deactivators as well if necessary further high pressure additives.

To further explain the invention, lubricating oils with the composition given in Table I were used manufactured, tested and the results compared. The lubricating oils are 6

ίο to 9 lubricating oils according to the invention, while the Lubricating oils 1 to 5 correspond to the state of the art and are used for comparison.

^{The pressure absorption capacity of lubricating oils 1 to 8 at oil temperatures of 60 ° C and HO 0} C was tested on an IAE gearbox (described in Institute of Petroleum Method 166 / 60T) with BSS-EN-34 steel gearwheels.

The eating loads at 200 rpm and 6000 rpm were determined as essential characteristics and in

ao Table II compiled.

Table I.

Composition of the lubricating oils in percent by weight

Di- (isooctyl azelate)

Chlorinated diphenyl with a chlorine content

of 54 percent by weight

Triphenyl phosphorothionate

3,7-dioctylphenothiazine

5-methylbenzotriazole

Polydimethylsiloxane

Phenyl-a-naphthylamine

*) ppm = parts per million parts.

94.0 3 Lubricating oil 95.0 92.0 7th 3.0 95.0 ^4th , 3.0 93.0 1 I 2 - 5.0 92.0 2.0 2.0 5.0 100.0 1.5 - 8.0 1.5 1.5 2.0 25 ppm *) - - 25 ppm *) 25 ppm *) - - 5 ppm *) - - 5 ppm *) 5 ppm *) - - 1.5 - - 1.5 1.5 - - - - - - - -

Table II

Lubricating oil

4 I 5

IAE eating load, kp
2000 rpm

60 ⁰ C

110 ° C

6000 rpm

6O ⁰ C

110 ⁰ C

Sum of the eating loads, kp

Increase in eating loads with increasing concentration of chlorinated Diphenyl

Degree of increase in eating load per 1% increase in concentration of chlorinated diphenyl

20.41 20.41

15.88 11.34 68.04

24.95 33.57

20.41 15.42 94.35

26.31

31.75
31.75

21.32

16.78

101.60

7.26

19 ι

34.02
34.02 40.82
36.29 45.36
47.63 49.90
49.90 22.68
18.14
108.86 18.14
20.41
115.57 18.14
13.61
124.74 29.48
27.22
156.49 7.26 - 9.07 31.75 5 7th 35

> 54.43

> 54.43

38.56 38.56

> 185.97

> 29.48

> 22

From the results in Table II and in particular the figures in the last rubric (degree of increase the seizure load ...) it can be seen that an addition of chlorinated polyphenyl alone to a An increase in the seizure load gives rise to what corresponds to an improved pressure absorption capacity, the measure however, the increase decreases rapidly with increasing concentration of the additive (lubricating oils according to Examples 2 to 4).

The addition of a small amount of phosphorothionic acid ester to the base oil (lubricating oil 1) increases its pressure absorption capacity considerably (lubricating oil 5). The pressure receptivity of the phosphorothionic acid ester-containing lubricating oil 5 is increased by the addition a small amount of chlorinated polyphenylene (Lube Oil 6), although not by the same amount Amount as that of the base oil (lube oil 1) by the same amount of chlorinated polyphenyl allen (lube oil 2).

However, if the amount of chlorinated polyphenyl added (lubricating oils 7 and 8) is increased, it is increased not only does the pressure absorption capacity become faster

than the concentration of chlorinated polyphenylene, while the extent of the increase in the feeding load Lubricating oils without a phosphorothionic acid ester content drops rapidly (cf. lubricating oils 2 to 4), but the increase in the eating load compared to the base oil (lubricating oil 1) is also absolutely greater than the sum of the increase in eating load due to the two additives in the corresponding concentrations.

This effect is quite surprising and allows lubricating oils to be made available which, with regard to the pressure absorption capacity meet all requirements.

Claims (1)

Claim: Lubricating oil based on aliphatic carboxylic acid esters, characterized in that that it is a combination of a chlorinated di- or polyphenyl with at least one chlorine substituent contains in each benzene nucleus and a triaryl ester of phosphorothionic acid with 6 to 10 carbon atoms in each aryl radical. ίο Publications considered: German Patent No. 1,067,553;
"Lubricating Engineering", August 1952, p. 179, table III. 709 637/606 p. 67 © Bundesdruckerei Berlin