Aqueous lubricant for metalworking

Abstract

The invention relates to a lubricant composition containing water and, with respect to the total weight of the lubricant composition: - from 1 to 60% by weight of polyalkylene glycol, - from 0.1 to 30% by weight of alkoxylated fatty alcohol(s), - from 0.1 to 30% by weight of an anti-corrosion system comprising at least one acid and at least one base. The invention also relates to the use of the lubricant composition according to the invention for metalworking.

Description

[0001] DESCRIPTION

[0002] TITLE: AQUEOUS LUBRICANT FOR METALWORKING

[0003] TECHNICAL FIELD OF THE INVENTION

[0004] The invention relates to an aqueous lubricant intended to be used for metalworking, in particular for the deformation of metal parts, or the forming, cutting, stamping or rolling of metal parts, in particular made of aluminum or steel.

[0005] STATE OF THE ART

[0006] For metalworking, and especially for deformation operations, especially on aluminum, there are products based on formulas comprising a solvent and a fatty substance. The solvent generally serves as a vector for depositing the fatty substance useful for lubrication on the surface of the metal, the solvent evaporating during the operation.

[0007] However, these products containing non-aqueous solvents may be toxic and therefore pose a potential health risk. The presence of these non-aqueous solvents may also lead to the marketing of labeled products and the need for people using these products to wear protective equipment, including personal protective equipment, when handling the product.

[0008] In addition, these non-aqueous solvent-based products can be difficult to clean and therefore require the use of specific cleaning products that are complex to handle. There is therefore an interest in providing a lubricating composition, particularly for metalworking, which can overcome the drawbacks of the prior art and in particular limit the use of solvents, particularly toxic or potentially toxic solvents.

[0009] An objective of the present invention is to provide a lubricating composition, in particular a lubricating composition for metalworking, limiting the use of non-aqueous solvent, in particular toxic or potentially toxic solvent and thus having an improved eco-design profile.

[0010] Water-based formulations have been proposed to limit the use of organic solvent.

[0011] The water-based formulations currently on the market do not always meet the expectations of those involved in the deformation of metal parts, particularly aluminum, from a part quality point of view, since they are likely to generate staining problems during heat treatment, as heat treatment is generally carried out after the deformation of a metal part, particularly an aluminum part. Tests carried out with products intended primarily for steel may have limitations on aluminum, a softer material requiring the addition of specific additives.

[0012] Document WO 2017 / 114827 describes an aqueous formulation comprising an alkoxylated fatty alcohol and an anti-corrosion agent.

[0013] The present invention provides a lubricating composition having improved lubricating properties for the deformation of metal parts, in particular aluminum and steel, which composition generates little or no volatile organic compounds (VOCs) when heated, in particular up to 80°C.

[0014] SUMMARY OF THE INVENTION

[0015] The invention relates to a lubricating composition comprising water and: from 1 to 60% by weight of polyalkylene glycol, from 0.1 to 30% by weight of alkoxylated fatty alcohol(s), from 0.1 to 30% by weight of an anti-corrosion system comprising at least one acid and at least one base, relative to the total weight of the lubricating composition.

[0016] According to one embodiment, the lubricating composition according to the invention comprises water and: from 1 to 60% by weight of polyalkylene glycol comprising alkylene oxide units comprising from 2 to 8 carbon atoms, from 0.1 to 20% by weight of ethoxylated and / or propoxylated fatty alcohol(s), from 0.1 to 30% by weight of an anti-corrosion system comprising at least one monocarboxylic acid and at least one amine, relative to the total weight of the lubricating composition.

[0017] According to one embodiment, the lubricating composition according to the invention is a ready-to-use composition comprising water and: from 1 to 30% by weight of polyalkylene glycol, from 0.1 to 10% by weight of ethoxylated and / or propoxylated fatty alcohol(s), from 0.1 to 15% by weight of the anti-corrosion system, relative to the total weight of the lubricating composition.

[0018] According to one embodiment, the lubricating composition according to the invention is a concentrated composition comprising water and: from 30 to 60% by weight of polyalkylene glycol, from 1 to 15% by weight of ethoxylated and / or propoxylated fatty alcohol(s), from 10 to 30% by weight of the anti-corrosion system, relative to the total weight of the lubricating composition.

[0019] Preferably, said at least one base is chosen from alkanolamines, preferably from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0020] Preferably, the polyalkylene glycol(s) are chosen from poly(ethylene glycol), poly(propylene glycol), block copolymers comprising ethylene oxide units and propylene oxide units, and mixtures thereof, preferably from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, more preferably from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof.

[0021] Preferably, each polyalkylene glycol has a molecular weight ranging from 500 to 10000 g / mol, preferably from 800 to 5000 g / mol, more preferably from 1000 to 3000 g / mol.

[0022] Preferably, each polyalkylene glycol has a viscosity at 40°C ranging from 10 to 1000 mm 2 / s, preferably 15 to 500 mm 2 / s, preferably from 20 to 400 mm 2 / s.

[0023] Preferably, the alkoxylated fatty alcohol(s) are chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols, and their mixture.

[0024] Preferably, each alkoxylated fatty alcohol comprises from 1 to 20 alkoxylated units and / or a hydrocarbon chain comprising from 6 to 24 carbon atoms.

[0025] According to one embodiment, the lubricating composition according to the invention further comprises at least one polyol, preferably glycerol, preferably in a proportion ranging from 0.1 to 15% by weight, more preferably from 0.5 to 10% by weight, relative to the total weight of the lubricating composition.

[0026] According to one embodiment, the lubricating composition according to the invention is a ready-to-use composition comprising water and: from 5 to 30% by weight of PAG chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol, from 0.1 to 10% by weight of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and mixtures thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol, from 0.05 to 10% by weight of aliphatic monocarboxylic acid(s) comprising from 4 to 15 atoms of carbon, and from 0.05 to 10% by weight of alkanolamine(s) chosen from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine,2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.,

[0027] According to one embodiment, the lubricating composition according to the invention is a concentrated composition comprising water and: from 30 to 60% by weight of PAG chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol, from 1 to 10% by weight of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and mixtures thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol, from 5 to 15% by weight of aliphatic monocarboxylic acid(s) comprising from 4 to 15 carbon atoms, and from 5 to 15% by weight of alkanolamine(s) chosen from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine,2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.,

[0028] According to one embodiment, the lubricating composition according to the invention is characterized in that it has emissions of total volatile organic compounds at 80°C according to standard NF EN 12619 (2013) of less than 200 ppm, preferably less than 150 ppm, more preferably less than 100 ppm, or even less than 50 ppm.

[0029] The invention also relates to the use of the lubricating composition according to the invention, as a fluid for metalworking, in particular for deforming metals and / or for forming metals and / or for cutting metals and / or for stamping metals and / or for rolling metals, the metals preferably being chosen from steel and aluminum. Preferably, the emissions of total volatile organic compounds at 80°C according to standard NF EN 12619 (2013) are less than 200 ppm, preferably less than 150 ppm, more preferably less than 100 ppm, or even less than 50 ppm.

[0030] The invention also relates to the use of the lubricating composition according to the invention for improving the eco-performance of a process comprising at least one metalworking step, in which the eco-performance is chosen from: reducing the energy consumed for implementing the process, increasing the productivity of the process, improving the safety of the operators of the process, the eco-performance being in particular chosen from improving the safety of the operators of the process.

[0031] The invention makes it possible to provide a multi-service lubricating composition since it can be implemented on different types of metal surfaces, in particular aluminum surfaces and steel surfaces.

[0032] The invention makes it possible to provide a lubricating composition having a good toxicological profile and a low impact on the environment.

[0033] The lubricating composition according to the invention generates very few volatile organic compounds (VOCs), or even no VOCs at all, when heated.

[0034] The invention makes it possible to provide a lubricating composition which does not generate oil deposits on the ground, which increases operator safety and thus improves the eco-design profile of the composition.

[0035] The lubricating composition according to the invention is little or no staining, it generates very few or no stains when it is used on metal parts, in particular during post-treatment of aluminum.

[0036] The lubricating composition according to the invention can be used for the deformation of thin metal parts, for example for the shaping of heat exchangers.

[0037] DETAILED DESCRIPTION OF THE INVENTION

[0038] The invention relates to a lubricating composition comprising water and:

[0039] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of polyalkylene glycol (PAG),

[0040] - from 0.1 to 30% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohol(s), - from 0.1 to 30% by weight, preferably from 1 to 30% by weight, of an anti-corrosion system comprising at least one acid and at least one base, relative to the total weight of the lubricating composition.

[0041] The lubricating composition according to the invention may be a ready-to-use composition or a concentrated composition, also called a composition to be diluted.

[0042] Indeed, the lubricating composition according to the invention can be diluted with the addition of water before being used as a fluid for metalworking.

[0043] When the composition is ready for use, it can be used directly as a metalworking fluid, without the need for dilution.

[0044] Where the composition is a ready-to-use composition, it preferably comprises water and:

[0045] - from 1 to 30% by weight, preferably from 5 to 25% by weight, of polyalkylene glycol,

[0046] - from 0.1 to 10% by weight, preferably from 0.5 to 5% by weight, of ethoxylated and / or propoxylated fatty alcohol(s),

[0047] - from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight, of the anti-corrosion system, relative to the total weight of the lubricating composition.

[0048] When the composition is a composition to be diluted (concentrated), it preferably comprises water and:

[0049] - from 30 to 60% by weight, preferably from 35 to 55% by weight, of polyalkylene glycol,

[0050] - from 1 to 15% by weight, preferably from 1.5 to 10% by weight, of ethoxylated and / or propoxylated fatty alcohol(s),

[0051] - from 10 to 30% by weight, preferably from 15 to 25% by weight, of the anti-corrosion system, relative to the total weight of the lubricating composition.

[0052] Polyalkylene glycol (PAG)

[0053] The lubricating composition according to the invention comprises at least one PAG. The PAG may be a polymer or a copolymer. When it is a copolymer, it may be a random copolymer or a block copolymer.

[0054] According to one embodiment, the PAG(s) of the lubricating composition according to the invention are chosen from PAGs comprising alkylene oxide units comprising from 2 to 12 carbon atoms, preferably from 2 to 8 carbon atoms, more preferably from 2 to 4 carbon atoms. Typically, in the context of the present invention, if the PAG comprises a terminal group of hydroxyl type (-OH) and a terminal group of alkyl type, then said terminal group of alkyl type comprises from 1 to 5 carbon atoms.

[0055] According to one embodiment, the PAG(s) used in the lubricating composition according to the invention corresponds to formula (I):

[0056] R-(OA) Z OR' (I) in which:

[0057] R and R' represent, independently of one another, a hydrogen atom or alkyl group, linear or branched, comprising from 1 to 5 carbon atoms;

[0058] A, all identical or different, represents an alkyl group, linear or branched, comprising from 2 to 8 carbon atoms; z represents an integer greater than or equal to 2, preferably an integer greater than or equal to 4.

[0059] According to one embodiment, the PAG(s) of the lubricating composition according to the invention are chosen from poly(ethylene glycol) (PEG), poly(propylene glycol) (PPG), block copolymers comprising ethylene oxide units and propylene oxide units, and mixtures thereof, preferably from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, more preferably from ethylene oxide-propylene oxide diblock copolymers, propylene oxide-ethylene oxide-propylene oxide triblock copolymers, ethylene oxide-propylene oxide-ethylene oxide triblock copolymers, and mixtures thereof.

[0060] For the purposes of the present invention, the term "block copolymers comprising ethylene oxide units and propylene oxide units" means copolymers comprising at least one block resulting from the polymerization of ethylene glycol and at least one block resulting from the polymerization of propylene glycol. They may then be called PEG / PPG.

[0061] For the purposes of the present invention, the term "ethylene oxide-propylene oxide diblock copolymers" means copolymers consisting of two blocks, one block resulting from the polymerization of ethylene glycol and one block resulting from the polymerization of propylene glycol. They can then be called PEG-PPG.

[0062] For the purposes of the present invention, the term "propylene oxide-ethylene oxide-propylene oxide triblock copolymers" means copolymers consisting of three blocks, sequenced, one block resulting from the polymerization of propylene glycol, one block resulting from the polymerization of ethylene glycol and one block resulting from the polymerization of propylene glycol (in this order). They may then be called PPG-PEG-PPG. For the purposes of the present invention, the term "ethylene oxide-propylene oxide-ethylene oxide triblock copolymers" means copolymers consisting of three blocks, sequenced, one block resulting from the polymerization of ethylene glycol, one block resulting from the polymerization of propylene glycol and one block resulting from the polymerization of ethylene glycol (in this order). They may then be called PEG-PPG-PEG.

[0063] The PAG(s) used in the invention may optionally comprise alkyl end groups, for example chosen from linear or branched alkyl groups comprising from 1 to 8 carbon atoms, preferably from 1 to 5 carbon atoms.

[0064] Preferably, the lubricating composition according to the invention comprises at least one PAG having an alkyl terminal group comprising from 1 to 5 carbon atoms.

[0065] According to one embodiment, the PAG(s) used in the lubricating composition according to the invention corresponds to one of formulas (II) to (V):

[0066] R-(OCH2CH2) x (OCH2CH(CH3)) y OR' (II);

[0067] R-(OCH2CH(CH3))y(OCH2CH2) x OR' (III);

[0068] R-(OCH2CH(CH3))y(OCH2CH2)x(OCH2CH(CH3))y'OR' (IV);

[0069] R-(OCH2CH2) x (OCH2CH(CH3))y(OCH2CH2)xOR' (V); in which:

[0070] R and R' represent, independently of each other, a hydrogen atom or a saturated, linear or branched alkyl group comprising from 1 to 5 carbon atoms; x and x', identical or different, represent an integer greater than or equal to 2, preferably greater than or equal to 4, y and y', identical or different, represent an integer greater than or equal to 2.

[0071] Preferably, in the compounds of formula (II), (III), (IV) or (V) according to the invention, x, x', y and y' are, independently of one another, an integer ranging from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20.

[0072] Preferably, in formula (IV), x is an integer ranging from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20, and the sum y+y' ranges from 8 to 45, preferably from 12 to 40, more preferably from 20 to 35.

[0073] Preferably, in formula (V), y is an integer ranging from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20, and the sum x+x' ranges from 8 to 45, preferably from 12 to 40, more preferably from 20 to 35.

[0074] According to one embodiment, each PAG included in the lubricating composition according to the invention has a molecular mass ranging from 500 to 10,000 g / mol, preferably from 700 to 5,000 g / mol, more preferably from 1,000 to 3,000 g / mol. According to one embodiment, each PAG included in the lubricating composition according to the invention has a viscosity at 40°C ranging from 8 to 1,000 mm 2 / s, preferably 10 to 500 mm 2 / s, preferably from 10 to 400 mm 2 / s.

[0075] Viscosity at 40°C can be measured according to ASTM D7042.

[0076] According to one embodiment, each PAG included in the lubricating composition according to the invention has a pour point below 0°C, preferably below -15°C, more preferably below -20°C.

[0077] Pour point can be measured according to ISO 3016.

[0078] According to one embodiment, each PAG included in the lubricating composition according to the invention has a cloud point ranging from 10 to 120°C, preferably from 20 to 110°C, more preferably from 40 to 100°C.

[0079] The cloud point can be measured according to standard NF EN 1890.

[0080] The PAG(s) represent from 1 to 60% by weight, preferably from 5 to 60% by weight, of the total weight of the lubricating composition (reduced to 100% by weight).

[0081] PAGs are commercially available products.

[0082] Alkoxylated alcohol(s)

[0083] According to one embodiment, the alkoxylated fatty alcohol(s) (also called polyalkoxylated fatty alcohols) are chosen from ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture.

[0084] In the context of the present invention, alkoxylated fatty alcohols are different from PAGs.

[0085] Typically, the alkoxylated fatty alcohols of the lubricating composition are in the form of a mixture of fatty alcohols comprising a distribution of compounds which differ in the number of alkoxylated units.

[0086] According to one embodiment, each alkoxylated fatty alcohol comprises from 1 to 20 alkoxylated units, preferably from 1 to 10 alkoxylated units, the alkoxylated units preferably being chosen from ethoxylated units, propoxylated units and their mixture.

[0087] According to a preferred embodiment, the alkoxylated fatty alcohols used in the lubricating composition according to the invention comprise ethoxylated units, optionally in combination with propoxylated units. Indeed, the ethoxylated units will provide good solubility in water. According to one embodiment, each alkoxylated fatty alcohol comprises an aliphatic hydrocarbon chain comprising from 6 to 24 carbon atoms, preferably from 6 to 16 carbon atoms.

[0088] The lubricating composition according to the invention may comprise a mixture of alkoxylated fatty alcohols in which the alkoxylated fatty alcohols differ from each other by the length of the hydrocarbon chain. According to this embodiment, the hydrocarbon chain, preferably of alkyl type, comprises from 6 to 18 carbon atoms, preferably from 6 to 14 carbon atoms.

[0089] According to a preferred embodiment, the molar mass of the alkoxylated fatty alcohols ranges from 130 to 900 g / mol, preferably from 170 to 500 g / mol, more preferably from 200 to 400 g / mol.

[0090] The alkoxylated fatty alcohols represent from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of the total weight of the lubricating composition (reduced to 100% by weight).

[0091] Alkoxylated fatty alcohols are commercially available products.

[0092] Anti-corrosion system

[0093] The anti-corrosion system implemented in the lubricating composition according to the present invention comprises at least one acid and at least one base.

[0094] Among the acids that may be mentioned are aliphatic monocarboxylic acids, in particular having from 4 to 15 carbon atoms, for example octanoic acid or isononanoic acid, aliphatic dicarboxylic acids having from 4 to 15 carbon atoms, for example decanedioic acid (sebacic acid), undecanedioic acid, dodecanedioic acid, isononanoic acid, and mixtures thereof.

[0095] Preferably, the acid of the anti-corrosion system implemented in the invention is a saturated acid.

[0096] Preferably, the acid of the anti-corrosion system implemented in the invention consists of carbon, hydrogen and oxygen atoms.

[0097] Preferably, the acids are chosen from monoacids. Indeed, diacids can cause staining problems.

[0098] Among the bases can be mentioned amines, in particular alkanolamines and amino alcohols, potash and sodium hydroxide. The base(s) may be chosen from potash, sodium hydroxide, and ethanolamines, such as monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), triethanolamine (TEA), diglycolamine (DGA), isopropanolamines, such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA) and triisopropanolamine (TIPA), ethylene amines, such as ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA), cyclamines, such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0099] According to one embodiment, the base(s) are chosen from monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), triethanolamine (TEA), diglycolamine (DGA), isopropanolamines, such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA) and triisopropanolamine (TIPA), ethylene amines, such as ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA), cyclamines, such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0100] According to a preferred embodiment, the lubricating composition comprises: from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 0.5 to 7% by weight, of acid(s), and from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 1 to 7% by weight of base(s), relative to the total weight of the lubricating composition.

[0101] According to a preferred embodiment, the lubricating composition comprises: from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 0.5 to 7% by weight, of aliphatic carboxylic acid(s), and from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 1 to 7% by weight of amine(s), relative to the total weight of the lubricating composition.

[0102] According to a preferred embodiment, the lubricating composition comprises: from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 1 to 7% by weight, of aliphatic monocarboxylic acid(s), and from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 1 to 7% by weight of alkanolamine(s), relative to the total weight of the lubricating composition.

[0103] According to a preferred embodiment, the lubricating composition comprises: from 0.05 to 10% by weight, preferably from 0.1 to 7% by weight, more preferably from 0.5 to 5% by weight, of aliphatic monocarboxylic acid(s) comprising from 4 to 15 carbon atoms, and from 0.05 to 10% by weight, preferably from 0.1 to 10% by weight, more preferably from 1 to 10% by weight of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (Tl PA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1 ,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0104] According to a preferred embodiment, the lubricating composition comprises: from 0.05 to 10% by weight, preferably from 0.1 to 7% by weight, more preferably from 0.5 to 5% by weight, of saturated aliphatic monocarboxylic acid(s) comprising from 4 to 15 carbon atoms, and from 0.05 to 10% by weight, preferably from 0.1 to 10% by weight, more preferably from 1 to 10% by weight of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (Tl PA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1 ,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0105] According to one embodiment, the acid / base mass ratio of the anti-corrosion system ranges from 0.1 to 2, preferably from 0.2 to 1, more preferably from 0.3 to 0.8.

[0106] Preferably, the anti-corrosion system is chosen so as to maintain the pH of the lubricating composition at an alkaline pH, i.e. a pH ranging from 8 to 11, preferably from 8 to 10.

[0107] The acid-base anti-corrosion system represents from 0.1 to 30% by weight, preferably from 1 to 30% by weight, of the total weight of the lubricating composition (reduced to 100% by weight).

[0108] Polyol

[0109] According to one embodiment, the lubricating composition according to the invention further comprises at least one polyol comprising from 2 to 8 carbon atoms and at least two hydroxyl functions.

[0110] For the purposes of the present invention, the polyol does not have an ether function. The polyol is preferably glycerol. For the purposes of the present invention, glycerol also includes glycerin.

[0111] Thus, according to a particular embodiment, the lubricating composition according to the invention further comprises glycerol.

[0112] Preferably, the polyol, preferably glycerol, represents from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight of the weight of the lubricating composition according to the invention.

[0113] When the composition is ready for use, preferably the polyol, preferably glycerol, represents from 0.1 to 10% by weight, more preferably from 0.5 to 5% by weight of the weight of the lubricating composition according to the invention.

[0114] When the composition is concentrated (and therefore to be diluted), preferably, the polyol, preferably glycerol, represents from 1 to 15% by weight, more preferably from 2 to 10% by weight of the weight of the lubricating composition according to the invention.

[0115] The inventors have in fact discovered that a polyol such as glycerol, added to the lubricating composition comprising at least one PAG, at least one fatty alcohol and an anti-corrosion system, makes it possible to improve the metalworking process thanks to a reduction in residues and therefore a reduction in sticking problems which can arise during the transport of the metal part at the end of the metalworking process.

[0116] Lubricating composition

[0117] The lubricating composition according to the invention is an aqueous lubricating composition. Water may represent from 10 to 95% by weight of the total weight of the lubricating composition.

[0118] When the composition is a ready-to-use composition, the water preferably represents from 40 to 95% by weight, preferably from 50 to 90% by weight, of the total weight of the lubricating composition.

[0119] When the composition is a concentrated composition (to be diluted), the water preferably represents from 10 to 50% by weight, preferably from 10 to 30% by weight, of the total weight of the lubricating composition.

[0120] The lubricating composition according to the invention may further comprise at least one additive chosen from the additives conventionally used by those skilled in the art in lubricating compositions for metalworking, preferably at least one additive chosen from anti-foams, biocides, wetting agents, friction modifiers, antifreeze additives, anti-corrosion agents other than acid-base systems, and their mixture.

[0121] According to one embodiment, the lubricating composition according to the invention further comprises at least one additive chosen from anti-foams, anti-corrosion agents of the benzotriazole or tolyltriazole type, and biocides, alone or as a mixture, preferably in a total amount ranging from 0.01 to 5% by weight, preferably from 0.05 to 3% by weight, relative to the total weight of the lubricating composition.

[0122] According to one embodiment, the viscosity at 40°C of the lubricating composition ranges from 1 to 20 mm 2 / s, preferably 1.5 to 5 mm 2 / s.

[0123] The viscosity at 40°C of the lubricating composition can be measured according to ASTM D7042.

[0124] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0125] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms,

[0126] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0127] - from 0.1 to 30% by weight, preferably from 1 to 30% by weight, of an anti-corrosion system comprising at least one acid and at least one base, relative to the total weight of the lubricating composition.

[0128] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0129] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms,

[0130] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0131] - from 0.1 to 30% by weight, preferably from 1 to 30% by weight, of an anti-corrosion system comprising at least one acid and at least one base,

[0132] - from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight, of polyol, preferably glycerol, relative to the total weight of the lubricating composition.

[0133] According to one embodiment, the lubricating composition according to the invention comprises water and: - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms,

[0134] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0135] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic carboxylic acid(s),

[0136] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of amine(s), relative to the total weight of the lubricating composition.

[0137] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0138] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms,

[0139] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0140] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic carboxylic acid(s) consisting of carbon, hydrogen and oxygen atoms,

[0141] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of amine(s), relative to the total weight of the lubricating composition.

[0142] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0143] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0144] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0145] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic carboxylic acid(s), - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of amine(s), relative to the total weight of the lubricating composition.

[0146] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0147] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0148] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0149] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic carboxylic acid(s),

[0150] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of amine(s),

[0151] - from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight, of polyol, preferably glycerol, relative to the total weight of the lubricating composition.

[0152] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0153] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal groups, identical or different, alkyl having from 1 to 5 carbon atoms,

[0154] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0155] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 0.5 to 5% by weight, of aliphatic carboxylic acid(s),

[0156] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of amine(s), relative to the total weight of the lubricating composition.

[0157] According to one embodiment, the lubricating composition according to the invention comprises water and: - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms,

[0158] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0159] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s), and

[0160] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s), relative to the total weight of the lubricating composition.

[0161] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0162] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms,

[0163] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0164] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s), and

[0165] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s),

[0166] - from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight, of polyol, preferably glycerol, relative to the total weight of the lubricating composition.

[0167] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0168] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms,

[0169] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0170] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s) comprising from 4 to 15 carbon atoms, and - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (Tl PA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0171] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0172] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof,

[0173] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0174] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s), and

[0175] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s), relative to the total weight of the lubricating composition.

[0176] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0177] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof,

[0178] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture,

[0179] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and

[0180] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (Tl PA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0181] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0182] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAGs chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0183] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0184] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and

[0185] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (Tl PA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0186] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0187] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAGs chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0188] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0189] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and

[0190] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (Tl PA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof,

[0191] - from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight, of polyol, preferably glycerol, relative to the total weight of the lubricating composition.

[0192] When the composition is a ready-to-use composition, according to one embodiment, the lubricating composition according to the invention comprises water and:

[0193] - from 1 to 30% by weight of PAGs chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0194] - from 0.1 to 10% by weight of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0195] - from 0.05 to 10% by weight of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and

[0196] - from 0.05 to 10% by weight of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0197] When the composition is a ready-to-use composition, according to one embodiment, the lubricating composition according to the invention comprises water and:

[0198] - from 1 to 30% by weight of PAGs chosen from ethylene oxide-propylene oxide diblock copolymers and propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0199] - from 0.1 to 10% by weight of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0200] - from 0.05 to 10% by weight of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and - from 0.05 to 10% by weight of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof,

[0201] - from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight, of polyol, preferably glycerol, relative to the total weight of the lubricating composition.

[0202] According to one embodiment, the lubricating composition according to the invention comprises water and:

[0203] - from 1 to 60% by weight, preferably from 5 to 60% by weight, of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal groups, identical or different, alkyl having from 1 to 5 carbon atoms,

[0204] - from 0.1 to 20% by weight, preferably from 0.1 to 15% by weight, of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0205] - from 0.05 to 15% by weight, preferably from 0.1 to 10% by weight, of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and

[0206] - from 0.05 to 15% by weight, preferably from 0.1 to 12% by weight, of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0207] When the composition is a ready-to-use composition, according to one embodiment, the lubricating composition according to the invention comprises water and:

[0208] - from 1 to 30% by weight of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, said PAG being terminated by one or two terminal groups, identical or different, alkyl having from 1 to 5 carbon atoms, - from 0.1 to 10% by weight of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0209] - from 0.05 to 10% by weight of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and

[0210] - from 0.05 to 10% by weight of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition.

[0211] When the composition is a ready-to-use composition, according to one embodiment, the lubricating composition according to the invention comprises water and:

[0212] - from 1 to 30% by weight of PAG comprising alkylene oxide units comprising from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal groups, identical or different, alkyl having from 1 to 5 carbon atoms,

[0213] - from 0.1 to 10% by weight of alkoxylated fatty alcohols chosen from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixture, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0214] - from 0.05 to 10% by weight of aliphatic monocarboxylic acid(s) containing from 4 to 15 carbon atoms, and

[0215] - from 0.05 to 10% by weight of alkanolamine(s) chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof,

[0216] - from 0.1 to 15% by weight, preferably from 0.5 to 10% by weight, of polyol, preferably glycerol, relative to the total weight of the lubricating composition.

[0217] Preferably, the lubricating composition according to the invention is in the form of a solution. Indeed, the ingredients of the lubricating composition are preferably soluble or solubilized in water. For the purposes of the present invention, a “solution” is distinguished from an emulsion or a dispersion which may contain several phases or which may contain non-solubilized particles.

[0218] According to one embodiment, the aqueous lubricating composition according to the invention is not an emulsion.

[0219] The lubricating composition according to the invention can be prepared by simply mixing the ingredients, according to any methods known to those skilled in the art to obtain a solution.

[0220] Applications

[0221] The invention also relates to the use of the lubricating composition according to the invention, as a fluid for metalworking, in particular for the deformation of metal parts and / or for the forming of metal parts and / or for the cutting of metal parts and / or for the stamping of metal parts and / or for the rolling of metal parts, the metals preferably being chosen from steel and aluminum.

[0222] It should be noted that the lubricating composition may be diluted with water before use as a metalworking fluid.

[0223] The present invention also relates to a method for lubricating at least one metal surface of a metal part, in particular aluminum or steel, comprising bringing the lubricating composition into contact with said metal surface.

[0224] Preferably, the contacting step is carried out by spraying the lubricating composition or by depositing the lubricating composition on the metal surface, the deposition being able to be carried out for example using a roller or a brush.

[0225] Preferably, the metal surface is an aluminum or steel surface.

[0226] The metal parts are preferably of low thickness, for example of thicknesses less than or equal to 5 μm, preferably less than or equal to 3 μm, more preferably a thickness ranging from 0.35 to 1.5 μm.

[0227] It should be noted that the lubrication process may comprise a step of diluting the lubricating composition with water before the step of bringing the lubricating composition (thus diluted) into contact with said metal surface.

[0228] The inventors have in fact observed that the combination of PAG, alkoxylated fatty alcohol and an acid-base anti-corrosion system makes it possible to obtain a lubricating composition having reduced or even zero VOC emissions even when heated to 80°C, said composition having excellent lubricating properties for metalworking, and in particular for metal deformation.

[0229] The lubricating composition according to the invention thus has universality in that it can be used both for the deformation of steel and for the deformation of aluminum.

[0230] According to one embodiment, the lubrication method further comprises a step of heat treatment of the metal part, after the contacting step. For example, the heat treatment may be heating to a temperature of at least 150°C, or even at least 200°C or even at least 300°C. This embodiment including a heat treatment step is particularly well suited when the metal part is an aluminum part.

[0231] The lubricating composition according to the invention can also be used to provide deformed metal parts without staining said metal part, in particular when the part is made of aluminum.

[0232] The PAG(s) used in the aforementioned use may have one or more of the characteristics and preferences described above in the context of the lubricating composition according to the invention.

[0233] The alkoxylated fatty alcohol(s) in the aforementioned use may have one or more of the characteristics and preferences described above in the context of the lubricating composition according to the invention.

[0234] The anti-corrosion system in the aforementioned use may have one or more of the characteristics and preferences described above in the context of the lubricating composition according to the invention.

[0235] The lubricating composition resulting from the aforementioned use may have one or more of the characteristics and preferences described above in the context of the lubricating composition according to the invention.

[0236] The invention also relates to the use of the lubricating composition according to the invention for improving the eco-performance of a process comprising at least one metalworking step, in which the eco-performance is chosen from: reducing the energy consumed for implementing the process, increasing the productivity of the process, improving the safety of the operators of the process, the eco-performance being in particular chosen from improving the safety of the operators of the process.

[0237] Indeed, reducing VOC emissions ultimately helps reduce energy consumption and thus contributes to reducing global warming.

[0238] Indeed, reducing staining allows for better productivity.

[0239] In addition, the use of an aqueous solvent compared to an organic solvent improves operator safety and also eliminates the need for a high-temperature drying step in an oven.

[0240] The metalworking step may comprise deforming metal parts and / or forming metal parts and / or cutting metal parts and / or stamping metal parts and / or rolling metal parts, the metals preferably being selected from steel and aluminum.

[0241] In other words, the lubricating composition according to the invention makes it possible to reduce the environmental impact of a process comprising at least one metalworking step.

[0242] EXAMPLES

[0243] In the remainder of this description, examples are given for the purpose of illustrating the present invention and are not intended in any way to limit its scope.

[0244] In the examples, the following ingredients were used:

[0245] PAG1 denotes a linear poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) units in an EO / PO ratio of approximately 1 / 1, PAG1 being terminated by methyl and butyl groups, PAG1 having a molecular mass ranging from 1000 to 2000 g / mol.

[0246] PAG2 denotes a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) units in an EO / PO ratio of approximately 1 / 1, PAG2 being terminated by a butyl group at one end and a hydroxyl group at the other end, PAG2 having a molecular weight ranging from 1000 to 2000 g / mol.

[0247] PAG3 denotes a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) units, PAG3 being terminated by an alkyl group at one end and a hydroxyl group at the other end, PAG3 having a molecular weight ranging from 1000 to 2500 g / mol.

[0248] PAG4 denotes a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) units in an EO / PO ratio of approximately 1 / 2, PAG4 being terminated by hydroxyl groups, PAG4 having a molecular mass ranging from 2000 to 3000 g / mol. alkoxylated fatty alcohol denotes one or more alcohols comprising propoxylated and / or ethoxylated units and an aliphatic hydrocarbon chain comprising 12-14 carbon atoms. alkanolamine means one or more alkanolamines selected from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DI PA), triisopropanolamine (Tl PA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof. C8-C10 aliphatic monoacid means one or more aliphatic monocarboxylic acids having 8 to 10 carbon atoms.C8-C10 aliphatic diacid means one or more aliphatic dicarboxylic acids having 8 to 10 carbon atoms. triazine salt is a system comprising a fatty triacid salt derived from 1,3,5-triazine. 99.5% glycerin. additive package means a mixture of additives conventionally used in lubricating compositions for metalworking, including in particular an antifoam and an anticorrosion agent of the benzotriazole type.

[0249] Example 1: Measurement of VOC emissions

[0250] In this example, a lubricating composition according to the invention was compared to two organic solvent-based lubricating compositions used for the deformation of metal parts.

[0251] Table 1 gives details of the compositions tested; the percentages are percentages by weight relative to the total weight of the composition. [Table 1]

[0252] The tests were carried out in accordance with standard EN NF 12619, by weighing 3g of product, and testing two temperatures: 30°C and 80°C.

[0253] Total VOC emissions, converted to ppm, are shown in Table 2 for the three compositions tested and for the two temperatures tested.

[0254] [Table 2]

[0255] The results in this table 2 show that the lubricating composition according to the invention has zero VOC emissions, even at 80°C.

[0256] Example 2: Staining tests on aluminum plates

[0257] In this example, staining tests were set up to determine the staining power of the lubricating composition on an aluminum part.

[0258] Table 3 shows the details of the lubricant compositions tested in this example. [Table 3]

[0259] Staining is assessed by spraying the lubricating composition onto an aluminum plate and placing the plate in an oven heated to 350°C and holding the plate at 350°C for 10 minutes. The level of staining is assessed by assigning a score from 0 (not stained) to 5 (very stained).

[0260] The Cl 1 composition described in Table 1 and the compositions in Table 3 were evaluated and the results are shown in Table 4.

[0261] [Table 4]

[0262] As shown by the results in Table 4, the compositions of the invention are less staining than composition CC3. In addition, compositions C11, C12 and C14 comprising a monoacid are less staining than composition C13 free of monoacid.

[0263] In addition, the CI4 composition has demonstrated a reduction in residues and therefore sticking problems that can occur with the devices for transporting metal parts at the end of the metalworking process of said parts.

Claims

CLAIMS Lubricating composition comprising water and: from 1 to 60% by weight of polyalkylene glycol, from 0.1 to 30% by weight of alkoxylated fatty alcohol(s), from 0.1 to 30% by weight of an anti-corrosion system comprising at least one acid and at least one base, relative to the total weight of the lubricating composition. Lubricating composition according to claim 1, comprising water and: from 1 to 60% by weight of polyalkylene glycol comprising alkylene oxide units having from 2 to 8 carbon atoms, from 0.1 to 20% by weight of ethoxylated and / or propoxylated fatty alcohol(s), from 0.1 to 30% by weight of an anti-corrosion system comprising at least one monocarboxylic acid and at least one amine, relative to the total weight of the lubricating composition.A lubricating composition according to claim 1 or 2, further comprising at least one polyol, preferably glycerol, said polyol, preferably said glycerol, being preferably used in a proportion of 0.1 to 15% by weight, preferably 0.5 to 10% by weight, relative to the total weight of the lubricating composition. A lubricating composition according to any one of claims 1 to 3, said composition being a ready-to-use composition comprising water and: 1 to 30% by weight of polyalkylene glycol, 0.1 to 10% by weight of ethoxylated and / or propoxylated fatty alcohol(s), and 0.1 to 15% by weight of the anti-corrosion system, relative to the total weight of the lubricating composition.Lubricating composition according to any one of claims 1 to 3, said composition being a concentrated composition comprising water and: 30 to 60% by weight of polyalkylene glycol, 1 to 15% by weight of ethoxylated and / or propoxylated fatty alcohol(s), 10 to 30% by weight of the anti-corrosion system, relative to the total weight of the lubricating composition. Lubricating composition according to any one of claims 1 to 5, wherein said at least one base is selected from the alkanolamines, preferably from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, mono-isopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.A lubricating composition according to any one of claims 1 to 6, wherein the polyalkylene glycol(s) are selected from poly(ethylene glycol), poly(propylene glycol), block copolymers comprising ethylene oxide units and propylene oxide units, and mixtures thereof, preferably from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, and more preferably from diblock copolymers of ethylene oxide-propylene oxide and triblock copolymers of propylene oxide-ethylene oxide-propylene oxide and mixtures thereof. A lubricating composition according to any one of claims 1 to 7, wherein each polyalkylene glycol has a molecular weight ranging from 500 to 10,000 g / mol, preferably from 800 to 5,000 g / mol, and more preferably from 1,000 to 3,000 g / mol.Lubricating composition according to any one of claims 1 to 8, wherein each polyalkylene glycol has a viscosity at 40°C ranging from 10 to 1000 mm. 2 / s, preferably from 15 to 500 mm 2 / s, preferably still from 20 to 400 mm 2 / s. Lubricating composition according to any one of claims 1 to 9, wherein the alkoxylated fatty alcohol(s) are selected from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols, and mixtures thereof. Lubricating composition according to any one of claims 1 to 10, wherein each alkoxylated fatty alcohol comprises from 1 to 20 alkoxylated units and / or a hydrocarbon chain comprising from 6 to 24 carbon atoms. Lubricating composition according to any one of claims 1 to 4 and 6 to 11, said composition being a ready-to-use composition comprising water and: from 5 to 30% by weight of PAGs selected from ethylene oxide-propylene oxide diblock copolymers and propylene oxide- triblock copolymers ethylene oxide-propylene oxide and their mixtures, PAGs having a molecular mass ranging from 1000 to 3000 g / mol, from 0.1 to 10% by weight of alkoxylated fatty alcohols selected from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and their mixtures, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol, from 0.05 to 10% by weight of monocarboxylic aliphatic acid(s) comprising from 4 to 15 carbon atoms, and from 0.05 to 10% by weight of alkanolamine(s) selected from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, the methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition. Lubricating composition according to any one of claims 1 to 3 and 5 to 11,said composition being a concentrated composition comprising water and: 30 to 60% by weight of PAGs selected from the diblock copolymers ethylene oxide-propylene oxide and the triblock copolymers propylene oxide-ethylene oxide-propylene oxide and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol; 1 to 10% by weight of alkoxylated fatty alcohols selected from ethoxylated fatty alcohols, ethoxylated and proproxylated fatty alcohols and mixtures thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol; 5 to 15% by weight of monocarboxylic aliphatic acid(s) comprising 4 to 15 carbon atoms; and 5 to 15% by weight of of alkanolamine(s) selected from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, mono-isopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol,2-Amino-2-methyl-1-propanol and mixtures thereof, relative to the total weight of the lubricating composition. Lubricating composition according to any one of claims 1 to 13, characterized in that it has total volatile organic compound emissions at 80°C according to standard NF EN 12619 of less than 200 ppm, preferably less than 150 ppm, preferably even less than 100 ppm, or even less than 50 ppm. Use of the lubricating composition according to any one of claims 1 to 14, as a fluid for metalworking, in particular for metal deformation and / or metal forming and / or metal cutting and / or metal stamping and / or metal rolling, the metals being preferably selected from steel and aluminum. Use according to claim 15, wherein the emissions of total volatile organic compounds at 80°C according to standard NF EN 12619 are less than 200 ppm, preferably less than 150 ppm, preferably even less than 100 ppm, or even less than 50 ppm.Use of a lubricating composition according to any one of claims 1 to 14, to improve the eco-performance of a process comprising at least one metalworking step, wherein the eco-performance is selected from: the reduction of energy consumed for the implementation of the process, the increase in the productivity of the process, the improvement of the safety of the process operators, preferably from the improvement of the safety of the process operators.

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