WO2015144816A1

WO2015144816A1 - Lubricant composition made of sorbitan triesters

Info

Publication number: WO2015144816A1
Application number: PCT/EP2015/056536
Authority: WO
Inventors: Fanny BRIAND; Véronique VERROUL
Original assignee: Total Marketing Services
Priority date: 2014-03-27
Filing date: 2015-03-26
Publication date: 2015-10-01
Also published as: FR3019185A1

Abstract

The present invention relates to an anhydrous lubricant composition including at least one base oil, at least one non-alkoxylated sorbitan triester and at least one alkoxylated sorbitan triester, as well as an emulsion of said anhydrous composition. The emulsion according to the invention has good stability properties and good anti-foaming properties, while maintaining good lubricating properties.

Description

Sorbitan triesters lubricating composition Technical field

The present invention is applicable to the field of lubricants, particularly lubricants for working metals, more particularly for drawing copper. More particularly, the present invention relates to an anhydrous lubricating composition comprising at least one base oil, at least one non-alkoxylated sorbitan triester and at least one alkoxylated sorbitan triester.

The present invention also relates to an emulsion comprising this anhydrous lubricating composition, as well as to its method of production. The emulsion according to the invention has both good stability and good non-foaming properties, while maintaining good lubricating properties.

The present invention also relates to a lubrication process using this emulsion.

The present invention also relates to a copper drawing process using this emulsion.

The present invention also relates to the use of a non-alkoxylated sorbitan triester and an alkoxylated sorbitan triester in an emulsified lubricant composition for drawing copper.

Technological background

The lubricants commonly used for metal working are generally obtained from an anhydrous composition comprising at least one lubricating base oil as well as various performance additives, such as, for example, extreme pressure additives or else different fatty substances from the oils. base lubricant, followed by the conversion of this anhydrous composition into an emulsion by the use of at least one emulsifier, this emulsion being very predominantly in the form of an oil-in-water emulsion.

These emulsions may in particular be used for the work of copper, and more particularly for the drawing of copper.

The drawing of the copper makes it possible to obtain copper wires of definite section and shapes. Wire drawing is a process of cold transformation consisting in passing the metal through a calibrated orifice, called die, under the action of a continuous traction.

The extremely high pressures that develop in the drawing process require particular lubricants which must in particular: - Withstand the high temperature rises implemented,

- Reduce the effort to exert to obtain the deformation,

- Ensure a stable lubrication regime,

- Support the successive operations of wire drawing.

A lubricant for copper wire drawing must have an ideal compromise between detergency, lubricity and cooling capacity. The thickness of the wire, the reduction made and the structure of the drawing machine (single or multi-wire) can in particular define the choice of lubricant.

The emulsions thus obtained must, in addition to the above properties, have good stability as well as good non-foaming properties.

Stability and non-foaming properties ensure optimum use in lubricant service and improved bath life with low maintenance. The cooling and lubrication capacity is thus enhanced for better performance.

One of the known ways to reduce or even eliminate foaming is to add in the emulsion an anti-foaming agent, which is in particular in the form of a silicone compound or a wax.

However, the presence of such an antifoam agent requires an additional step which usually consists in adding the anti-foaming agent either at the end of the preparation of the concentrate or in post-treatment in the emulsion.

Of the emulsifiers that can be used, the alkoxylated or non-alkoxylated sorbitan esters are known. Thus, the use of this type of emulsifier, alone or in combination, has already been described.

FR2547311 discloses a metal working oil comprising a combination of a sorbitan monooleate and an ethoxylated sorbitan monolaurate.

CN102839038 discloses a metal working oil comprising a combination of a sorbitan monooleate and an ethoxylated sorbitan monooleate.

WO9207053 discloses a metalworking fluid in the form of an W / O emulsion and comprising a sorbitan ester and an ethoxylated sorbitan ester. The sorbitan ester is preferably a sorbitan monooleate and the ethoxylated sorbitan ester is an ethoxylated sorbitan trioleate. However, these compositions may have problems of instability, and more particularly of instability over time.

Furthermore, US3715312 discloses an emulsifiable composition comprising a base oil, a first ester may be a mono-, di- or tri-sorbitan ester and a second ester may be an ethoxylated mono-, di- or triester sorbitan ester. . Preferentially, the sorbitan ester is a sorbitan monooleate and the ethoxylated sorbitan ester is an ethoxylated sorbitan trioleate. This composition is intended for the treatment of glass.

There is therefore still a need to look for lubricants for metal working, and more particularly for drawing copper, having both good stability and good non-foaming properties while maintaining good lubricating, cooling and detergency.

There is also the need to obtain a lubricant for metal working, and more particularly for drawing copper, having both good stability and good non-foaming properties without addition of antifoaming agent. An object of the present invention is to provide a lubricant composition overcoming all or in part the aforementioned drawbacks.

Another object of the invention is to provide a lubricant composition whose formulation is easy to implement. SUMMARY OF THE INVENTION

The invention thus relates to an anhydrous lubricating composition comprising:

at least one base oil,

at least one non-alkoxylated sorbitan triester, and

at least one alkoxylated sorbitan triester;

wherein the mass ratio (non-alkoxylated sorbitan triester: alkoxylated sorbitan triester) ranges from 2: 1 to 1: 2.

The invention also relates to a lubricating composition in the form of an oil-in-water emulsion comprising the anhydrous lubricant composition above. Surprisingly, the Applicant has found that the presence of at least one non-alkoxylated sorbitan triester and at least one alkoxylated sorbitan triester In an emulsified lubricating composition for metal working, the lubricating composition can be simultaneously imparted with good stability as well as good non-foaming properties.

Thus, the present invention makes it possible to formulate emulsified lubricating compositions comprising an optimized content of emulsifiers and having both good stability and good non-foaming properties.

Advantageously, the emulsified lubricating compositions according to the invention have good non-foaming properties in the absence of anti-foaming agent.

Advantageously, the emulsified lubricant compositions according to the invention retain good lubricating, cooling and detergency properties.

Advantageously, the emulsified lubricant compositions according to the invention have an improved effectiveness in time, and more particularly in service.

In one embodiment of the invention, the anhydrous lubricant composition consists essentially of:

at least one base oil,

at least one non-alkoxylated sorbitan triester, and

at least one alkoxylated sorbitan triester.

The invention also relates to the use of a lubricant composition in the form of an oil-in-water emulsion as defined above for the lubrication of a wire, preferably a copper wire.

In one embodiment of the invention, the above use is carried out in a copper drawing process.

The invention also relates to a method for lubricating a wire, preferably a copper wire, comprising at least one step of bringing said wire into contact with a lubricating composition in the form of an oil-in-water emulsion such as defined above. In one embodiment of the invention, the above method is implemented in a copper wire drawing process.

The invention also relates to the use of a non-alkoxylated sorbitan triester and an alkoxylated sorbitan triester in an emulsified lubricant composition for copper drawing.

Detailed description of the invention

The percentages given below correspond to percentages by mass of active ingredient.

Non alkoxylated sorbitan triester

The anhydrous lubricant composition according to the invention comprises at least one non-alkoxylated sorbitan triester. By triester of non-alkoxylated sorbitan and as opposed to the definition of the alkoxylated sorbitan triester is meant any tri-sorbitan triester compound having no function alkylene oxide.

The non-alkoxylated sorbitan triester can be obtained by any type of process known to those skilled in the art. The non-alkoxylated sorbitan triester may be of synthetic, animal or vegetable origin.

In a preferred embodiment of the invention, the non-alkoxylated sorbitan triester is of plant origin.

By non-alkoxylated sorbitan triester of vegetable origin, is meant in particular a non-alkoxylated sorbitan triester resulting from the reaction, and in particular esterification, between a fatty substance of vegetable origin and a sorbitan molecule.

The fatty substance of vegetable origin may comprise fatty acids of different hydrocarbon chain length, which may or may not comprise at least one unsaturation.

In one embodiment of the invention, the fatty substance of plant origin may comprise at least one fatty acid comprising from 5 to 40 carbon atoms, preferably from 8 to 30 carbon atoms, more preferably from 10 to 30 carbon atoms. carbon, more preferably from 15 to 25 carbon atoms, preferably from 15 to 20 carbon atoms and which may or may not comprise at least one unsaturation. In a preferred embodiment of the invention, the fatty substance of plant origin comprises a fatty acid chosen from caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, ricinoleic acid or mixtures thereof.

Thus, the non-alkoxylated sorbitan triester according to the invention may be chosen from the compounds of formula (I):

in which :

R1 represents a hydrogen atom or a group -C (O) R5,

R2 represents a hydrogen atom or a group -C (O) R5,

R3 represents a hydrogen atom or a group -C (O) R5,

R 4 represents a hydrogen atom or a group -C (O) R 5, with one of the groups R 1, R 2, R 3 or R 4 representing a hydrogen atom,

- R5 represents a linear or branched, saturated or unsaturated alkyl group comprising from 5 to 40 carbon atoms, preferably from 8 to 30 carbon atoms.

In a preferred embodiment of the invention, R5 represents a linear or branched, preferably linear, unsaturated alkyl group comprising from 10 to 30 carbon atoms, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 carbon atoms. of carbon.

In a preferred embodiment of the invention, R 5 represents an alkylene group comprising from 10 to 30 carbon atoms, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 carbon atoms.

Advantageously, the sorbitan triester is a trioteate of sorbitan. In another embodiment of the invention, R5 represents a saturated alkyl group comprising from 10 to 30 carbon atoms, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 carbon atoms. In a preferred embodiment of the invention, the sorbitan triester is a sorbitan tristearate.

Examples of non-alkoxylated sorbitan triester include Montane 85, Span 85, Radiasurf 7355 or Alkamuls STO.

In one embodiment of the invention, the content by weight of non-alkoxylated sorbitan triester ranges from 4 to 10%, preferably from 4 to 8% relative to the total weight of the anhydrous lubricating composition. Alkoxylated sorbitan triester

The anhydrous lubricating composition according to the invention comprises at least one alkoxylated sorbitan triester. The alkoxylated sorbitan triester may be of synthetic, animal or vegetable origin.

The alkoxylated sorbitan triester can be obtained by any type of process known to those skilled in the art.

In one embodiment, the alkoxylated sorbitan triester is obtained by the reaction of alkylene oxide with one or more free -OH groups of a sorbitan triester.

The alkoxylated sorbitan triester may in particular be chosen from alkoxylated sorbitan triesters having:

a saponification value (Saponification value in English) ranging from 70 to 100 mg KOH / g, preferably from 80 to 95 mg KOH / g;

an acid value (Acid value in English) of less than or equal to 5 mg KOH / g, preferably less than or equal to 2 mg KOH / g;

a hydroxyl value (hydroxyl value in English) ranging from 30 to 60 mg KOH / g, preferably from 35 to 55 mg KOH / g. In one embodiment of the invention, the alkoxylated sorbitan triester may be chosen from compounds of formula (II):

in which :

R6 represents a hydrogen atom or a -C (O) R10 group,

R7 represents a hydrogen atom or a -C (O) R10 group,

R8 represents a hydrogen atom or a -C (O) R10 group,

R 9 represents a hydrogen atom or a group -C (O) R 10,

R10 represents a linear or branched, saturated or unsaturated alkyl group comprising from 5 to 40 carbon atoms, preferentially from 8 to 30 carbon atoms,

a, b, c and d independently represent an integer between 0 and 40 and whose sum (a + b + c + d) represents an integer between 4 and 40, preferably between 10 and 30, more preferably between 15 and 40; and 25, preferably from 15 to 20.

In a preferred embodiment of the invention, R10 represents a linear or branched, preferably linear, unsaturated alkyl group comprising from 10 to 30 carbon atoms, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 carbon atoms. of carbon.

In a preferred embodiment of the invention, R10 represents an alkylene group comprising from 10 to 30 carbon atoms, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 carbon atoms. Advantageously, the sorbitan triester is a polyoxyethylenated sorbitan trioleate, preferably comprising 20 oxyethylene groups.

In another embodiment of the invention, R10 represents a saturated alkyl group comprising from 10 to 30 carbon atoms, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 carbon atoms.

In a preferred embodiment of the invention, the sorbitan triester is a polyoxyethylenesorbitan tristearate, preferably comprising 20 oxyethylene groups.

As examples of alkoxylated sorbitan triester, mention may be made of Montanox 85, Tween 85 or Alkamuls T85. In one embodiment of the invention, the weight content of alkoxylated sorbitan triester ranges from 4 to 10%, preferably from 4 to 8% relative to the total weight of the anhydrous lubricating composition.

According to the invention, the mass ratio (non-alkoxylated sorbitan triester: alkoxylated sorbitan triester) in the anhydrous lubricant composition is from 2: 1 to 1: 2.

Base oil

The lubricant compositions according to the invention may contain any type of mineral, synthetic or natural, animal or vegetable lubricating base oil adapted for their use.

The base oil (s) used in the lubricant compositions according to the present invention may be oils of mineral or synthetic origin of groups I to V according to the classes defined in the API classification (or their equivalents according to the ATIEL classification) as summarized. below, alone or mixed. Table I

The mineral base oils according to the invention include all types of bases obtained by atmospheric distillation and vacuum of crude oil, followed by refining operations such as solvent extraction, desalphating, solvent dewaxing, hydrotreatment, hydrocracking and hydroisomerization, hydrofinishing.

The base oils of the lubricant compositions according to the invention may also be synthetic oils, such as certain esters, or polyalphaolefins. The polyalphaolefins used as base oils are, for example, obtained from monomers having from 4 to 32 carbon atoms (for example octene, decene), and a viscosity at 100 ° C. of between 1.5 and 15 cSt according to the standard. ASTM D445. Their weight average molecular weight is typically between 250 and 3000 according to ASTM D5296. Mixtures of synthetic and mineral oils can also be used.

In one embodiment of the invention, the base oil is a Group I oil.

In one embodiment of the invention, the base oils represent at least 40%, preferably at least 45% by weight relative to the total weight of the anhydrous lubricating composition. Typically, they represent between 45 and 55% by weight. relative to the total mass of the anhydrous lubricating composition according to the invention. Other additives

The anhydrous lubricating compositions according to the invention may also contain any type of additive suitable for use in metalworking lubricant formulations, for example one or more additives selected from surfactants other than sorbitan triesters. Alkoxylated and alkoxylated sorbitan triesters according to the invention, wetting agents, anti-corrosions or friction modifiers, present at the usual contents required for the application. In a preferred embodiment of the invention, the anhydrous lubricant composition does not include antifoaming agent.

Indeed, the Applicant has found that the anhydrous lubricant composition according to the invention allows, after addition of water, to obtain an emulsion having good stability as well as good non-foaming properties, in the absence of antifouling agent. Thus, the absence of antifoaming agent in the emulsion makes it possible to dispense with an additional post-treatment step and thus to simplify the use of such an emulsion.

Oil in water emulsion

The subject of the invention is also a lubricating composition in the form of an oil-in-water emulsion comprising an anhydrous lubricating composition.

All of the features and preferences presented for the anhydrous lubricant composition apply to the lubricant composition in the form of an oil-in-water emulsion above.

The lubricating composition in the form of an oil-in-water emulsion according to the invention may be obtained by any emulsification process known to those skilled in the art.

In one embodiment of the invention, the content by weight of the above anhydrous lubricant composition ranges from 1 to 20%, preferably from 4 to 10% relative to the total weight of the lubricant composition in the form of a oil-in-water emulsion.

In another embodiment of the invention, the content by weight of water ranges from 80 to 99%, preferably from 90 to 96% relative to the total weight of the lubricant composition in the form of an oil emulsion. water. The lubricating composition in the form of an oil-in-water emulsion according to the invention may furthermore comprise an additive chosen from the additives as defined above.The lubricating composition in the form of an oil-in-water emulsion according to the invention. The invention may also comprise an additive chosen from bactericides, fungicides, present at the usual contents required for the application.

In a preferred embodiment of the invention, the lubricating composition in the form of an oil-in-water emulsion does not include antifoaming agent.

In a preferred embodiment of the invention, the lubricating composition in the form of an oil-in-water emulsion as defined above is used in a copper wire drawing process. All the characteristics and preferences presented for the oil-in-water emulsion apply to the above use.

The invention also relates to a process for lubricating a wire, preferably a copper wire, comprising at least one step of contacting said wire with a lubricant composition in the form of an oil-in-water emulsion. as defined above.

In one embodiment of the invention, the above method is implemented in a copper wire drawing process.

All the characteristics and preferences presented for the oil-in-water emulsion apply to the above process.

The invention also relates to the use of a non-alkoxylated sorbitan triester and an alkoxylated sorbitan triester in an emulsified lubricating composition for drawing copper. The set of characteristics and preferences presented for the non-alkoxylated sorbitan triester and the alkoxylated sorbitan triester apply to the above use. The various objects of the present invention and their implementations will be better understood on reading the examples which follow. These examples are given for information only, and are not limiting in nature.

Examples:

Anhydrous lubricant compositions No. 1 to No. 7 were prepared from the following compounds:

fatty acid: mixture of tall oil fatty acid containing 2% m / m of free resin acid,

non-alkoxylated sorbitan triester: sorbitan trioleate (Montane 85 from the company SEPPIC),

alkoxylated sorbitan triester: polyoxyethylenated sorbitan trioleate (Montanox 85 from CECA),

non-alkoxylated sorbitan monoester: sorbitan mono-oleate (Montane 80 from the company SEPPIC),

alkoxylated sorbitan monoester: polyoxyethylenated sorbitan mono-oleate (Montanox 80 from CECA),

- Base oil: Group I base oil with a viscosity at 40 ° C measured according to ASTM D445 4.0 mm ² / sec,

KOH solution: 60% w / w aqueous KOH solution as neutralizing agent for the free acids of the composition,

- Corrosion inhibitor; 50% w / w aqueous tolyltriazole solution,

- Nonionic emulsifier: polygycol ether (50E) based on oleic / cetyl alcohol,

- Friction modifier 1: castor oil,

- Friction modifier 2: octyl palmitate,

- Wetting agent: ethylene oxide / propylene oxide copolymer.

Lubricating compositions Nos. 1 to 7 are described in Table II; the percentages given are percentages by mass. Table II

Each of compositions No. 1 to No. 7 was then emulsified in a test tube, by mixing 5% of each of the compositions with 95% water and homogenized by inversion of the test specimen.

At the end of this step, the compositions No. 8 to No. 14 in the form of an O / W emulsion were obtained.

Lubricating compositions Nos. 8 to 14 are described in Table III; the percentages given are percentages by mass. Table III

Test 1: Evaluation of the non-foaming properties of lubricating compositions

It is a question of evaluating the non-foaming properties of the lubricating compositions No. 8 to No. 14 by measuring the level of foam.

This evaluation of the level of foam is carried out after 5 hours of recirculation of each composition and according to the standard NFT 60-185.

Table IV shows the foaming of lubricant compositions No. 8 to No. 14. Table IV

The results show that the combination of at least one non-alkoxylated sorbitan triester and at least one alkoxylated sorbitan triester in a lubricating composition in the form of an O / W emulsion corresponding to the invention (compositions No. 8 and No. 9) makes it possible to obtain good non-foaming properties, even in the absence of anti-foaming agent, and thus to improve the performance and the lifetime of the emulsion. Moreover, the results show that the removal of the non-alkoxylated sorbitan triester in favor of the alkoxylated sorbitan triester (composition No. 11) results in the appearance of the foaming phenomenon.

In addition, the results show that the substitution of the non-alkoxylated sorbitan triester with a non-alkoxylated sorbitan monoester (composition No. 13) results in the occurrence of the foaming phenomenon.

Test 2: Evaluation of the stability of lubricating compositions

It is a question of evaluating the stability in time of the lubricating compositions No. 8 to No. 14 by visual evaluation based on the observation of the appearance and the intensity of the phenomena:

creaming corresponding to the rise of the dispersed phase,

- Releasing oil corresponding to the appearance of a layer of oil on the surface,

- Release of water corresponding to the appearance of water at the bottom of the test tube,

the formation of soaps corresponding to the formation of deposits on the surface of the emulsion,

phase shift corresponding to the separation of the dispersed phase and the dispersant phase.

This visual evaluation was carried out 72h, 1 week, 2 weeks and 1 month after the formulation of each of the lubricating compositions No. 8 to No. 14.

Table V shows the stability of the lubricating compositions No. 8 to No. 14. Table V

The results show that the combination of at least one non-alkoxylated sorbitan triester and at least one alkoxylated sorbitan triester in a lubricating composition in the form of an O / W emulsion (compositions No. 8 and No. 9) allows not only to stabilize the emulsion but also to maintain this stability over time. These results demonstrate the importance of such a combination to obtain good stability and that lasts over time; indeed, composition No. 10 comprising only a non-alkoxylated sorbitan triester but no alkoxylated sorbitan triester does not exhibit good stability over time, just as composition No. 11 comprises only one sorbitan triester alkoxylated but no non-alkoxylated sorbitan triester.

These results also show that the substitution of the non-alkoxylated sorbitan triester with a non-alkoxylated sorbitan monoester and / or alkoxylated sorbitan triester with an alkoxylated sorbitan monoester (compositions No. 12, No. 13 and No. 14) consequence of degrading the stability of the emulsion over time.

The lubricant compositions according to the invention (compositions No. 8 and No. 9) also retain good lubricating, cooling and detergency properties, and more particularly in a copper drawing process.

Test 3: evaluation of the stability of lubricating compositions

This is to evaluate the stability over time of lubricating compositions.

For this purpose, the anhydrous lubricating compositions No. 15 and No. 16 were prepared as described in Table VI below:

Table VI

The compounds used in the preparation of anhydrous lubricating compositions Nos. 15 and 16 are identical to those used in anhydrous lubricating compositions Nos. 1 to 7.

Each of compositions No. 15 and No. 16 was then emulsified in a test tube by mixing 5% of each of the compositions with 95% water and homogenized by inversion of the test specimen.

At the end of this step, the compositions No. 17 and No. 18 in the form of an O / W emulsion were obtained,

Lubricating compositions Nos. 17 and 18 are described in Table VII; the percentages given are percentages by mass.

Table VII

The stability of lubricating compositions Nos. 17 and 18 was evaluated in the same manner as in test 2.

Table VIII shows the stability of the lubricating compositions No. 17 and No. 18. Table VIII

These results show the importance of the mass ratio (non-alkoxylated sorbitan triester: alkoxylated sorbitan triester) ranging from 2: 1 to 1: 2 in the combination of at least one non-alkoxylated sorbitan triester and at least one triester alkoxylated sorbitan to obtain not only the stability of the emulsion but also the maintenance of this stability over time.

Indeed, in the lubricating compositions No. 17 and No. 18, the mass ratio (non-alkoxylated sorbitan triester: alkoxylated sorbitan triester) is respectively 3: 1 and 1: 3; However, the emulsified lubricant compositions No. 17 and No. 18 do not exhibit good stability over time.

Claims

An anhydrous lubricating composition comprising:

at least one base oil,

at least one non-alkoxylated sorbitan triester, and

at least one alkoxylated sorbitan triester;

2. Lubricating composition according to claim 1 wherein the non-alkoxylated sorbitan triester is chosen from the compounds of formula (I):

in which :

R1 represents a hydrogen atom or a group -C (O) R5,

R2 represents a hydrogen atom or a group -C (O) R5,

R3 represents a hydrogen atom or a group -C (O) R5,

R 4 represents a hydrogen atom or a -C (O) R 5 group, with one of the groups R 1, R 2, R 3 or R 4 representing a hydrogen atom,

3. Lubricating composition according to claim 1 or 2 wherein R5 represents a linear or branched, preferably linear, unsaturated alkyl group comprising from 10 to 30 carbon atoms, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 atoms. of carbon.

4. Lubricating composition according to any one of the preceding claims wherein the weight content of non-alkoxylated sorbitan triester ranges from 4 to 10%, preferably from 4 to 8% relative to the total weight of the lubricating composition.

A lubricating composition according to any one of the preceding claims wherein the alkoxylated sorbitan triester is selected from the compounds of formula (II):

in which :

R6 represents a hydrogen atom or a -C (O) R10 group,

R7 represents a hydrogen atom or a -C (O) R10 group,

R8 represents a hydrogen atom or a -C (O) R10 group,

R 9 represents a hydrogen atom or a group -C (O) R 10,

a, b, c and d independently represent an integer between 0 and 40 and whose summation (a + b + c + d) represents an integer between 4 and 40, preferably between 10 and 30, more preferably between 15 and 40; and 25, preferably from 15 to 20.

A lubricating composition according to any one of the preceding claims wherein R10 represents a linear or branched, preferably linear, unsaturated alkyl group comprising from 10 to 30 carbon atoms. carbon, preferably from 15 to 25 carbon atoms, advantageously from 15 to 20 carbon atoms.

7. Lubricating composition according to any one of the preceding claims wherein the weight content of alkoxylated sorbitan triester ranges from 4 to 10%, preferably from 4 to 8% relative to the total weight of the lubricant composition.

The lubricating composition of any of the preceding claims wherein the base oil is a Group I base oil.

A lubricating composition according to any one of the preceding claims comprising anti-foaming agent.

A lubricating composition in the form of an oil-in-water emulsion comprising an anhydrous lubricant composition according to any one of claims 1 to 9.

The lubricating composition in the form of an oil-in-water emulsion according to claim 10, wherein the content by weight of anhydrous lubricating composition according to any one of claims 1 to 10 is from 1 to 20%, preferably from 4 to 10% relative to the total weight of the lubricant composition in the form of oil-in-water emulsion.

12. Lubricating composition in the form of an oil-in-water emulsion according to claim 10 or 11, in which the content by weight of water ranges from 80 to 99%, preferably from 90 to 96% relative to the total weight of the product. lubricating composition in the form of oil-in-water emulsion.

An in-line lubricating composition of an oil-in-water emulsion according to any one of claims 10 to 12 not comprising an antifoaming agent.

14. Use of a lubricant composition according to any one of claims 10 to 13 for the drawing of copper.