Aqueous lubricant for metalworking

Abstract

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

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to an aqueous lubricant intended to be used for metalworking, in particular for the deformation of metal parts, or for forming, cutting, stamping, or rolling metal parts, in particular in aluminium or steel.STATE OF THE ART

[0002] For metalworking, and in particular for deformation operations and particularly on aluminium, products are available that are based on formulas comprising a solvent and a fat. The solvent is generally used as vector allowing deposition of the fat used for lubrication on the surface of the metal, the solvent evaporating throughout the operation.

[0003] However, these products comprising non-aqueous solvents can prove to be toxic and hence pose a potential health risk. The presence of these non-aqueous solvents can also lead to the marketing of products requiring labelling and hence the need for persons using these products to wear protective equipment, in particular individual protective equipment when handling the product.

[0004] In addition, these products based on non-aqueous solvents can be difficult to clean and therefore require the use of specific cleaning products that are complex to apply. There is therefore a need to provide a lubricant composition, in particular for metalworking, which can overcome the disadvantages of the prior art by limiting the use of solvent, in particular a toxic or potentially toxic solvent.

[0005] It is one objective of the present invention to provide a lubricant composition, in particular a lubricant composition for metalworking, which limits the use of non-aqueous solvent, in particular a toxic or potentially toxic solvent, thereby being of improved environmentally-friendly design.

[0006] Aqueous-based formulations have been proposed to limit the use of organic solvent.

[0007] Aqueous-based formulations currently on the market do not always meet the expectations of operators in the field of deformation of metal parts in aluminium in particular, with respect to the quality of the metal parts since they are likely to generate staining problems during heat treatment, heat treatment generally being performed after deformation of a metal piece, in particular a piece in aluminium.

[0008] Tests implemented with products chiefly designed for steel can display limits on aluminium which is a softer material requiring the addition of specific additives.

[0009] Document WO 2017 / 114827 describes an aqueous formulation comprising an alkoxylated fatty alcohol and an anti-corrosion agent.

[0010] The present invention proposes a lubricant composition having improved lubricating properties for the deformation of metal parts, particularly in aluminium and steel, the composition generating little or no volatile organic compounds (VOCs) when heated and in particular up to 80° C.SUMMARY OF THE INVENTION

[0011] The invention concerns a lubricant composition comprising water and:

[0012] from 1 to 60 weight % of polyalkylene glycol,

[0013] from 0.1 to 30 weight % of alkoxylated fatty alcohol(s),

[0014] from 0.1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0015] relative to the total weight of the lubricant composition.

[0016] In one embodiment, the lubricant composition of the invention comprises water and:

[0017] from 1 to 60 weight % of polyalkylene glycol comprising alkylene oxide repeat units having 2 to 8 carbon atoms,

[0018] from 0.1 to 20 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0019] from 0.1 to 30 weight % of an anti-corrosion system comprising at least one carboxylic monoacid and at least one amine,

[0020] relative to the total weight of the lubricant composition.

[0021] In one embodiment, the lubricant composition of the invention is a ready-to-use composition comprising water and:

[0022] from 1 to 30 weight % of polyalkylene glycol,

[0023] from 0.1 to 10 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0024] from 0.1 to 15 weight % of the anti-corrosion system,

[0025] relative to the total weight of the lubricant composition.

[0026] In one embodiment, the lubricant composition of the invention is a concentrated composition comprising water and:

[0027] from 30 to 60 weight % of polyalkylene glycol,

[0028] from 1 to 15 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0029] from 10 to 30 weight % of the anti-corrosion system,

[0030] relative to the total weight of the lubricant composition.

[0031] Preferably, said at least one base is chosen from among alkanolamines, preferably from among monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof.

[0032] Preferably, the polyalkylene glycol(s) are chosen from among poly(ethylene glycol)s, poly(propylene glycol)s, block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units, and mixtures thereof, preferably from among block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units and mixtures thereof, more preferably from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof.

[0033] Preferably, each polyalkylene glycol has a molecular mass ranging from 500 to 10000 g / mol, preferably from 800 to 5000 g / mol, more preferably from 1000 to 3000 g / mol.

[0034] Preferably, each polyalkylene glycol has viscosity at 40° C. ranging from 10 to 1000 mm2 / s, preferably from 15 to 500 mm2 / s, more preferably from 20 to 400 mm2 / s.

[0035] Preferably, the alkoxylated fatty alcohol(s) are chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof.

[0036] Preferably, each alkoxylated fatty alcohol comprises 1 to 20 alkoxylated repeat units and / or a hydrocarbon chain having 6 to 24 carbon atoms.

[0037] In one embodiment, the lubricant composition of the invention further comprises at least one polyol, preferably glycerol, preferably in a proportion ranging from 0.1 to 15 weight %, more preferably from 0.5 to 10 weight % relative to the total weight of the lubricant composition.

[0038] In one embodiment, the lubricant composition of the invention is a ready-to-use composition comprising water and:

[0039] from 5 to 30 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0040] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0041] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0042] from 0.05 to 10 weight % of alkanolamine(s) chosen from among monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof,

[0043] relative to the total weight of the lubricant composition.

[0044] In one embodiment, the lubricant composition of the invention is a concentrated composition comprising water and:

[0045] from 30 to 60 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0046] from 1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0047] from 5 to 15 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0048] from 5 to 15 weight % of alkanolamine(s) chosen from among monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof,

[0049] relative to the total weight of the lubricant composition.

[0050] In one embodiment, the lubricant composition of the invention is characterized by emissions of total volatile organic compounds at 80° C. according to standard NF EN 12619 (2013) thar are lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm.

[0051] The invention further concerns the use of the lubricant composition of the invention as fluid for metalworking, in particular for the deformation of metals and / or for metal forming and / or for metal cutting and / or for metal stamping and / or for metal rolling, the metals preferably being chosen from among steel and aluminium.

[0052] Preferably, the emissions of total volatile organic compounds at 80° C. according to standard NF EN 12619 (2013) are lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm.

[0053] A further subject of the invention is the use of the lubricant composition of the invention to improve the eco-efficiency of a process comprising at least one metalworking step, wherein eco-efficiency is chosen from among:

[0054] reducing the energy consumed to implement the process,

[0055] increasing the productivity of the process,

[0056] improving the safety of operators of the process,the eco-efficiency being particularly selected from improvement in the safety of operators of the process.

[0057] The invention allows to provide a multi-service lubricant composition since it can be implemented on different types of metal surfaces, in particular aluminium surfaces and steel surfaces.

[0058] The invention allows the provision of a lubricant composition having a good toxicological profile and low environmental impact.

[0059] The lubricant composition of the invention generates very few volatile organic compounds (VOCs), even no VOCs at all when heated.

[0060] The invention allows the provision of a lubricant composition which does not generate oil deposits on the floor, thereby increasing the safety of operators and improving the eco-design aspect of the composition.

[0061] The lubricant composition of the invention is scarcely staining, or is even non-staining, generating very few or no stains when used on metal parts, in particular at the time of post-treatments on aluminium.

[0062] The lubricant composition of the invention can be used for the deforming of metal parts of narrow thickness, for example for the forming of heat exchangers.DETAILED DESCRIPTION OF THE INVENTION

[0063] The invention concerns a lubricant composition comprising water and:

[0064] from 1 to 60 weight %, preferably 5 to 60 weight % of polyalkylene glycol (PAG),

[0065] from 0.1 to 30 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohol(s),

[0066] from 0.1 to 30 weight %, preferably 1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0067] relative to the total weight of the lubricant composition.

[0068] The lubricant composition of the invention can be a ready-to-use composition or a concentrated composition, also called a composition to be diluted.

[0069] Indeed, the lubricant composition of the invention can be diluted by adding water before it is used as fluid for metalworking.

[0070] If the composition is ready-to-use, it can be used directly as metalworking fluid without requiring dilution.

[0071] If the composition is a ready-to-use composition, it preferably comprises water and:

[0072] from 1 to 30 weight %, preferably 5 to 25 weight % of polyalkylene glycol,

[0073] from 0.1 to 10 weight %, preferably 0.5 to 5 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0074] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of the anti-corrosion system,

[0075] relative to the total weight of the lubricant composition.

[0076] If the composition is a composition to be diluted (concentrated), it preferably comprises water and:

[0077] from 30 to 60 weight %, preferably 35 to 55 weight % of polyalkylene glycol,

[0078] from 1 to 15 weight %, preferably 1.5 to 10 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0079] from 10 to 30 weight %, preferably 15 to 25 weight % of the anti-corrosion system,

[0080] relative to the total weight of the lubricant composition.Polyalkylene Glycol (PAG)

[0081] The lubricant composition of the invention comprises at least one PAG. The PAG can be a polymer or copolymer. If it is a copolymer, it can be a statistical copolymer or block copolymer.

[0082] In one embodiment, the PAG(s) of the lubricant composition of the invention are chosen from among PAGs comprising alkylene oxide repeat units having 2 to 12 carbon atoms, preferably 2 to 8 carbon atoms, more preferably 2 to 4 carbon atoms.

[0083] Typically, in 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 has 1 to 5 carbon atoms.

[0084] In one embodiment, the PAG(s) used in the lubricant composition of the invention meet formula (I):where:

[0086] R and R′ are each independently a hydrogen atom, or linear or branched alkyl group having 1 to 5 carbon atoms;

[0087] A, all the same or different, are a linear or branched alkyl group having 2 to 8 carbon atoms;

[0088] z is an integer higher than or equal to 2, preferably an integer higher than or equal to 4.

[0089] In one embodiment, the PAG(s) of the lubricant composition of the invention are chosen from among poly(ethylene glycol(s) (PEGs), poly(propylene glycol(s) (PPGs), block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units, and mixtures thereof, preferably from among block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units, and mixtures thereof, more preferably from among diblock ethylene oxide-propylene oxide copolymers, triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and triblock ethylene oxide-propylene oxide-ethylene oxide copolymers, and mixtures thereof.

[0090] By «block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units» in the meaning of the present invention, it is meant copolymers comprising at least one block derived from polymerization of ethylene glycol and at least one block derived from polymerization of propylene glycol. They can then be called PEG / PPG.

[0091] By «diblock ethylene oxide-propylene oxide copolymers» in the meaning of the present invention, it is meant copolymers composed of two blocks, one block derived from polymerization of ethylene glycol and one block derived from polymerization of propylene glycol. They can then be called PEG-PPG.

[0092] By «triblock propylene oxide-ethylene oxide-propylene oxide copolymers» in the meaning of the present invention, it is meant copolymers composed of three blocks in sequence one block derived from polymerization of propylene glycol, one block derived from polymerization of ethylene glycol and one block derived from polymerization of propylene glycol (in this order). They can then be called PPG-PEG-PPG.

[0093] By «triblock ethylene oxide-propylene oxide-ethylene oxide copolymers» in the meaning of the present invention, it is meant copolymers composed of three blocks in sequence, one block derived from polymerization of ethylene glycol, one block derived from polymerization of propylene glycol and one block derived from polymerization of ethylene glycol (in this order). They can then be called PEG-PPG-PEG.

[0094] The PAG(s) used in the invention may optionally comprise terminal alkyl groups, chosen for example from among linear or branched alkyls having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms.

[0095] Preferably, the lubricant composition of the invention comprises at least one PAG comprising a terminal alkyl group having 1 to 5 carbon atoms.

[0096] In one embodiment, the PAG(s) used in the lubricant composition of the invention meet one of formulas (II) to (V):where:

[0098] R and R′ are each independently a hydrogen atom, or saturated, linear or branched alkyl group having 1 to 5 carbon atoms;

[0099] x and x′, identical or different, are an integer higher than or equal to 2, preferably higher than or equal to 4,

[0100] y and y′, identical or different, are an integer higher than or equal to 2.

[0101] Preferably, in the compounds of formula (II), (III), (IV) or (V) of the invention, x, x′, y, and y′ are each independently an integer ranging from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20.

[0102] 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.

[0103] 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.

[0104] In one embodiment, each PAG included in the lubricant composition of the invention has a molecular mass ranging from 500 to 10000 g / mol, preferably from 700 to 5000 g / mol, more preferably from 1000 to 3000 g / mol.

[0105] In one embodiment, each PAG included in the lubricant composition of the invention has viscosity at 40° C. ranging from 8 to 1000 mm2 / s, preferably from 10 to 500 mm2 / s, more preferably from 10 to 400 mm2 / s.

[0106] Viscosity at 40° C. can be measured according to standard ASTM D7042.

[0107] In one embodiment, each PAG included in the lubricant composition of the invention has a pour point lower than 0° C., preferably lower than −15° C., more preferably lower than −20° C.

[0108] Pour point can be measured according to standard ISO 3016.

[0109] In one embodiment, each PAG included in the lubricant composition of 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.

[0110] Cloud point can be measured according to standard NF EN 1890.

[0111] The PAG(s) represent from 1 to 60 weight %, preferably 5 to 60 weight % of the total weight of the lubricant composition (expressed as 100 weight %).

[0112] PAG(s) are commercially available products.Alkoxylated Fatty Alcohol(s)

[0113] In one embodiment, the alkoxylated fatty alcohol(s) (also called polyalkoxylated fatty alcohols) are chosen from among ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof.

[0114] In the present invention, the alkoxylated fatty alcohols differ from the PAGs.

[0115] Typically, the alkoxylated fatty alcohols of the lubricant composition are in the form of a mixture of fatty alcohols comprising a distribution of compounds differing through the number of alkoxylate repeat units.

[0116] In one embodiment, each alkoxylated fatty alcohol comprises from 1 to 20 alkoxylate repeat units, preferably 1 to 10 alkoxylate repeat units, the alkoxylate repeat units preferably being chosen from among ethoxylate repeat units, propoxylate repeat units and mixture thereof.

[0117] In one preferred embodiment, the alkoxylated fatty alcohols used in the lubricant composition of the invention comprise ethoxylate repeat units optionally in combination with propoxylate repeat units. Ethoxylate repeat units allow the obtaining of good water solubility.

[0118] In one embodiment, each alkoxylated fatty alcohol has an aliphatic hydrocarbon chain having 6 to 24 carbon atoms, preferably 6 to 16 carbon atoms.

[0119] The lubricant composition of the invention may comprise a mixture of alkoxylated fatty alcohols in which the alkoxylated fatty alcohols differ from each other through the length of the hydrocarbon chain. In this embodiment, the hydrocarbon chain, preferably of alkyl type, has 6 to 18 carbon atoms, preferably 6 to 14 carbon atoms.

[0120] In one 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.

[0121] The alkoxylated fatty alcohols represent from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of the total weight of the lubricant composition (expressed as 100 weight %).

[0122] The alkoxylated fatty alcohols are commercially available products.Anti-Corrosion System

[0123] The anti-corrosion system used in the lubricant composition of the present invention comprises a least one acid and at least one base.

[0124] Among acids, mention can be made of aliphatic monocarboxylic acids, in particular having 4 to 15 carbon atoms, e.g. octanoic acid or isononanoic acid, aliphatic dicarboxylic acids having 4 to 15 carbon atoms e.g. decanedioic acid (sebacic acid), undecanedioic acid, dodecanedioic acid, isononanoic acid, and mixtures thereof.

[0125] Preferably, the acid of the anti-corrosion system used in the invention is a saturated acid.

[0126] Preferably the acid of the anti-corrosion system used in the invention is composed of carbon, hydrogen, and oxygen atoms.

[0127] Preferably, the acids are chosen from among monoacids. Staining problems may arise with diacids.

[0128] Among bases, mention can be made of amines, in particular alkanolamines and amino alcohols, potassium hydroxide and sodium hydroxide. The base(s) can be chosen from among potash, sodium hydroxide, 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 ethylene diamine (EDA), diethylene triamine (DETA), triethylene tetramine (TETA) and tetraethylene pentamine (TEPA), cyclamines, such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof.

[0129] In one embodiment, the base(s) are chosen from among monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), triethanolamine (TEA), diglycolamine (DGA), isopropanolamines such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA) and triisopropanolamine (TIPA), ethylene amines such as ethylene diamine (EDA), diethylene triamine (DETA), triethylene tetramine (TETA) and tetraethylene pentamine (TEPA), cyclamines such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof.

[0130] In one preferred embodiment, the lubricant composition comprises:

[0131] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 0.5 to 7 weight % of acid(s), and

[0132] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of base(s),

[0133] relative to the total weight of the lubricant composition.

[0134] In one preferred embodiment, the lubricant composition comprises:

[0135] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 0.5 to 7 weight % of aliphatic carboxylic acid(s), and

[0136] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of amine(s),

[0137] relative to the total weight of the lubricant composition.

[0138] In one preferred embodiment, the lubricant composition comprises:

[0139] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of aliphatic monocarboxylic acid(s), and

[0140] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of alkanolamine(s),

[0141] relative to the total weight of the lubricant composition.

[0142] In one preferred embodiment, the lubricant composition comprises:

[0143] from 0.05 to 10 weight %, preferably 0.1 to 7 weight %, more preferably 0.5 to 5 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0144] from 0.05 to 10 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 10 weight % of alkanolamine(s) chosen from among 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,

[0145] relative to the total weight of the lubricant composition.

[0146] In one preferred embodiment, the lubricant composition comprises:

[0147] from 0.05 to 10 weight %, preferably 0.1 to 7 weight %, more preferably 0.5 to 5 weight % of saturated aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0148] from 0.05 to 10 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 10 weight % of alkanolamine(s) chosen from among 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,

[0149] relative to the total weight of the lubricant composition.

[0150] In one embodiment, the acid / base weight 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.

[0151] Preferably, the anti-corrosion system is chosen so as to maintain the pH of the lubricant composition at an alkaline pH i.e. a pH ranging from 8 to 11, preferably 8 to 10.

[0152] The acid / base anti-corrosion system represents from 0.1 to 30 weight %, preferably 1 to 30 weight % of the total weight of the lubricant composition (expressed as 100 weight %).Polyol

[0153] In one embodiment, the lubricant composition of the invention additionally comprises at least one polyol having 2 to 8 carbon atoms and at least two hydroxyl functions.

[0154] In the present invention, the polyol does not comprise an ether function.

[0155] The polyol is preferably glycerol.

[0156] In the present invention, the glycerol also includes glycerine.

[0157] Therefore, in one particular embodiment, the lubricant composition of the invention additionally comprises glycerol.

[0158] Preferably the polyol, more preferably glycerol, represents from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of the weight of the lubricant composition of the invention.

[0159] If the composition is ready-to-use, preferably the polyol, more preferably glycerol, represents 0.1 to 10 weight %, more preferably 0.5 to 5 weight % of the weight of the lubricant composition of the invention.

[0160] If the composition is concentrated (therefore to be diluted), preferably the polyol, more preferable glycerol, represents from 1 to 15 weight %, more preferably 2 to 10 weight % of the weight of the lubricant composition of the invention.

[0161] The inventors have discovered that a polyol such as glycerol added to the lubricant composition comprising at least one PAG, at least one fatty alcohol and an anticorrosion system, allows an improvement in the metalworking process by reducing residues and therefore by reducing problems of adherence which may arise during transport of a metal part after a metalworking process.Lubricant Composition

[0162] The lubricant composition of the invention is an aqueous lubricant composition. Water can represent 10 to 95 weight % of the total weight of the lubricant composition.

[0163] If the composition is a ready-to-use composition, the water preferably represents 40 to 95 weight %, preferably 50 to 90 weight % of the total weight of the lubricant composition.

[0164] If the composition is a concentrated composition (to be diluted), the water preferably represents 10 to 50 weight %, preferably 10 to 30 weight % of the total weight of the lubricant composition.

[0165] The lubricant composition of the invention may additionally comprise at least one additive chosen from among additives conventionally used by skilled persons in lubricant compositions for metalworking, preferably at least one additive chosen from among defoamers, biocides, wetting agents, friction modifiers, antifreeze additives, anti-corrosion agents differing from the acid-base systems, and mixture thereof.

[0166] In one embodiment, the lubricant composition of the invention additionally comprises at least one additive chosen from among antifoams, anticorrosion agents of benzotriazole or tolyltriazole type, and biocides, alone or in a mixture, preferably in a total amount ranging from 0.01 to 5 weight %, preferably 0.05 to 3 weight % relative to the total weight of the lubricant composition.

[0167] In one embodiment, the viscosity at 40° C. of the lubricant composition ranges from 1 to 20 mm2 / s, preferably from 1.5 to 5 mm2 / s.

[0168] Viscosity at 40° C. of the lubricant composition can be measured according to standard ASTM D7042.

[0169] In one embodiment, the lubricant composition of the invention comprises water and:

[0170] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkaline oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0171] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0172] from 0.1 to 30 weight %, preferably 1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0173] relative to the total weight of the lubricant composition.

[0174] In one embodiment, the lubricant composition of the invention comprises water and:

[0175] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0176] from 0.1 to 20 weight %, preferably 0.1 to 15 weights % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0177] from 0.1 to 30 weight %, preferably 1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0178] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0179] relative to the total weight of the lubricant composition.

[0180] In one embodiment, the lubricant composition of the invention comprises water and:

[0181] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0182] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0183] from 0.5 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s),

[0184] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0185] relative to the total weight of the lubricant composition.

[0186] In one embodiment, the lubricant composition of the invention comprises water and:

[0187] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0188] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0189] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s) constituted by carbon, hydrogen and oxygen atoms,

[0190] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0191] relative to the total weight of the lubricant composition.

[0192] In one embodiment, the lubricant composition of the invention comprises water and:

[0193] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0194] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0195] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s),

[0196] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0197] relative to the total weight of the lubricant composition.

[0198] In one embodiment, the lubricant composition of the invention comprises water and:

[0199] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0200] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0201] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s),

[0202] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0203] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0204] relative to the total weight of the lubricant composition.

[0205] In one embodiment, the lubricant composition of the invention comprises water and:

[0206] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two alkyl terminal groups, the same or different, having 1 to 5 carbon atoms,

[0207] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms,

[0208] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 0.5 to 5 weights % of aliphatic carboxylic acid(s),

[0209] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0210] relative to the total weight of the lubricant composition.

[0211] In one embodiment, the lubricant composition of the invention comprises water and:

[0212] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0213] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0214] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s), and

[0215] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamines(s),

[0216] relative to the total weight of the lubricant composition.

[0217] In one embodiment, the lubricant composition of the invention comprises water and:

[0218] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0219] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0220] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s), and

[0221] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s),

[0222] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0223] relative to the total weight of the lubricant composition.

[0224] In one embodiment, the lubricant composition of the invention comprises water and:

[0225] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0226] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0227] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0228] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0229] relative to the total weight of the lubricant composition.

[0230] In one embodiment, the lubricant composition of the invention comprises water and:

[0231] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof,

[0232] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0233] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s), and

[0234] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s),

[0235] relative to the total weight of the lubricant composition.

[0236] In one embodiment, the lubricant composition of the invention comprises water and:

[0237] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof,

[0238] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0239] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0240] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0241] relative to the total weight of the lubricant composition.

[0242] In one embodiment, the lubricant composition of the invention comprises water and:

[0243] from 1 to 60 weight %, preferably 5 to 60 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0244] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0245] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0246] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0247] relative to the total weight of the lubricant composition.

[0248] In one embodiment, the lubricant composition of the invention comprises water and:

[0249] from 1 to 60 weight %, preferably 5 to 60 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0250] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0251] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0252] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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, and

[0253] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0254] relative to the total weight of the lubricant composition.

[0255] If the composition is a ready-to-use composition, in one embodiment the lubricant composition of the invention comprises water and:

[0256] from 1 to 30 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0257] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0258] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0259] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0260] relative to the total weight of the lubricant composition.

[0261] If the composition is a ready-to-use composition, in one embodiment the lubricant composition of the invention comprises water and:

[0262] from 1 to 30 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixture thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0263] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0264] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0265] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0266] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0267] relative to the total weight of the lubricant composition.

[0268] In one embodiment, the lubricant composition of the invention comprises water and:

[0269] from 1 to 60 weight %, preferably 5 to 60 weight % of PAGs comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal alkyl groups, the same or different, having 1 to 5 carbon atoms,

[0270] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms,

[0271] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0272] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0273] relative to the total weight of the lubricant composition.

[0274] If the composition is a ready-to-use composition, according to one embodiment, the lubricant composition of the invention comprises water and:

[0275] from 1 to 30 weight % of PAGS comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal alkyl groups, the same or different, having 1 to 5 carbon atoms,

[0276] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms, and

[0277] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0278] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0279] relative to the total weight of the lubricant composition.

[0280] If the composition is a ready-to-use composition, according to one embodiment, the lubricant composition of the invention comprises water and:

[0281] from 1 to 30 weight % of PAGs comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal alkyl groups, the same or different, having 1 to 5 carbon atoms,

[0282] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms,

[0283] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0284] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0285] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0286] relative to the total weight of the lubricant composition.

[0287] Preferably, the lubricant composition of the invention is in the form of a solution. The ingredients of the lubricant composition are preferably water-soluble or solubilised in water.

[0288] In the meaning of the present invention, a «solution» differs from an emulsion or a dispersion possibly containing several phases or possibly containing non-solubilised particles.

[0289] In one embodiment, the aqueous lubricant composition of the invention is not an emulsion.

[0290] The lubricant composition of the invention can be prepared by simply mixing the ingredients using any method known to skilled persons to obtain a solution.Applications

[0291] The invention also concerns the use of the lubricant composition of the invention as fluid for metalworking, in particular for the deformation of metal parts and / or for the forming of metal parts and / or for the cutting metal parts and / or for the stamping of metal parts and / or for the rolling of metal parts, the metals preferably being chosen from among steel and aluminium.

[0292] It is to be noted that the lubricant composition can be diluted with water before use as fluid for metalworking.

[0293] The present invention also concerns a method for lubricating at least one surface of a metal part, notably in aluminium or steel, comprising contacting the lubricant composition with said metal surface.

[0294] Preferably, the contacting step is performed by spraying the lubricant composition or by depositing the lubricant composition on the metal surface, depositing possibly being carried out using a roller or brush.

[0295] Preferably the metal surface is a surface in aluminium or steel.

[0296] The metal parts are preferably of narrow thickness, for example a thickness of 5 μm or less, preferably of 3 μm or less, more preferably a thickness ranging from 0.35 to 1.5 μm.

[0297] It is to be noted that the lubrication method may comprise a step to dilute the lubricant composition with water before the contacting step of the (diluted) lubricant composition with said metal surface.

[0298] The inventors have observed that the combination of PAG, alkoxylated fatty alcohol and an acid / base anti-corrosion system allows a lubricant composition to be obtained having reduced and even zero VOC emissions, even when heated to 80° C., said composition having excellent lubricating properties for metalworking, and in particular for deformation of metals.

[0299] The lubricant composition of the invention therefore has versatility in that it can be used both for the deformation of steel and for the deformation of aluminium.

[0300] In one embodiment, the lubricating method additionally comprises a heat treatment step of the metal part, after the contacting step. For example, heat treatment can entail heating to a temperature of at least 150° C., even at least 200° C. even at least 300° C. This embodiment including a heat treatment step is particularly well adapted when the metal part is a part in aluminium.

[0301] The lubricant composition of the invention can also be used to provide deformed metal parts without staining said metal parts, in particular when the part is in aluminium.

[0302] The PAG(s) employed for the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0303] The alkoxylated fatty alcohol(s) employed for the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0304] The anti-corrosion system employed for the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0305] The lubricant composition resulting from the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0306] A further subject of the invention is the use of the lubricant composition of the invention to improve the eco-efficiency of a process comprising at least one metalworking step, wherein eco-efficiency is chosen from among:

[0307] reducing the energy consumed to implement the process,

[0308] increasing the productivity of the process,

[0309] improving the safety of operators of the process,the eco-efficiency being particularly chosen from an improvement in the safety of operators of the process.

[0310] By reducing VOC emissions, this leads in fine to reducing energy consumption and thereby takes part in reducing global warming.

[0311] By reducing staining, it is possible to obtain better productivity.

[0312] Additionally, the use of an aqueous solvent as compared with an organic solvent allows improved safety for operators and obviates the need for an oven drying step at high temperature.

[0313] The metalworking step may comprise the deformation of metals parts and / or the forming of metal parts and / or the cutting of metal parts and / or the stamping of metal parts and / or the rolling of metal parts, the metals preferably being chosen from among steel and aluminium.

[0314] In other words, the lubricant composition of the invention allows a reduction in the environmental impact of a process comprising at least one metalworking step.EXAMPLES

[0315] In the remainder of the present description, examples are given to illustrate the present invention which do not in any manner limit the scope thereof.In the examples, the following ingredients were used:PAG1 designates a linear poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units in an EO / PO ratio of about 1:1, PAG1 being terminated by methyl and butyl groups, PAG1 having a molecular mass ranging from 1000 to 2000 g / mol.

[0317] PAG2 designates a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units in an EO / PO ratio of about 1:1, PAG2 being terminated by a butyl group at one end and a hydroxyl group at the other end, PAG2 having a molecular mass ranging from 1000 to 2000 g / mol.

[0318] PAG3 designates a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units, PAG3 being terminated by an alkyl group at one end and a hydroxyl group at the other end, PAG3 having a molecular mass ranging from 1000 to 2500 g / mol.

[0319] PAG4 designates a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units in an EO / PO ratio of about 1:2, PAG4 being terminated by hydroxyl groups, PAG4 having a molecular mass ranging from 2000 to 3000 g / mol.

[0320] alkoxylated fatty alcohol designates one or more alcohols comprising propoxylate and / or ethoxylate repeat units and an aliphatic hydrocarbon chain having 12-14 carbon atoms,

[0321] alkanolamine designates one or more alkanolamines chosen from among 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,

[0322] C8-C10 aliphatic monoacid designates one or more aliphatic monocarboxylic acids having 8 to 10 carbon atoms,

[0323] C8-C10 aliphatic diacid designates one or more aliphatic dicarboxylic acids having 8 to 10 carbon atoms,

[0324] salt derived from triazine is a system comprising a fatty triacid salt derived from 1,3,5-triazine.

[0325] glycerine at 99.5%.

[0326] additive package designates a mixture of additives conventionally used in lubricant compositions for metalworking, particularly including an anti-foam and an anticorrosion agent of benzotriazole type.Example 1: Measurement of VOC Emissions

[0327] In this example, a lubricant composition of the invention was compared with two organic solvent-based lubricant compositions used for the deforming of metal parts.

[0328] Table 1 gives the details of the tested compositions, the percentages being weight percentages relative to the total weight of the composition.TABLE 1CC1CC2CI1Mineral oil of petroleum origin76%Ester24%24%Isoparaffinic oil of petroleum origin76%Water70.74%  PAG110%PAG210%Alkoxylated fatty alcohol 1%Alkanolamine4.6% C7-C11 aliphatic monoacid 3%Additive package0.66%

[0329] Tests were conducting conforming to standard EN NF 12619, weighing 3 g of product and testing two temperatures: 30° C. and 80° C.

[0330] Total VOC emissions, converted to ppm, are given in Table 2 for the three tested compositions and for the two tested temperatures.TABLE 2CC1CC2CI1VOC emissions at 30° C.192160VOC emissions at 80° C.44124040

[0331] The results in Table 2 show that the lubricant composition of the invention exhibits zero VOC emissions, even at 80° C.Example 2: Staining Tests on Aluminium Sheets

[0332] In this example, staining tests were set up to determine any staining by the lubricant composition on a part in aluminium.

[0333] Table 3 gives the details of the tested lubricant compositions in this example.TABLE 3CC3CI2CI3CI4Water72.95%70.45%   70.45%   71.45%   PAG15%5%2%PAG215% 15% 6%PAG3  20%PAG48%Alkoxylated fatty1%1%1%alcoholCastor oil   5%Salt derived from 1.5%triazineAlkanolamine4.6%  4.6%  4.6%  C7-C11 aliphatic3%3%monoacidC7-C11 aliphatic3%diacidGlycerine3%Additive package0.550.95%  0.95%  0.95%

[0334] Staining was assessed by spraying the lubricant composition onto a sheet of aluminium and placing said sheet in an oven heated to 350° C., and leaving the plate at 350° C. for ten minutes. The extent of staining was evaluated by allocating a score of 0 (no stain) up to 5 (very stained).

[0335] Composition CI1 described in Table 1 and the compositions of Table 3 were evaluated, and the results are given in Table 4.TABLE 4CC3CI1CI2CI3CI4Staining score50030

[0336] As shown by the results in Table 4, the compositions of the invention are less staining than composition CC3. In addition, compositions CI1, CI2 and CI4 comprising a monoacid are less staining than composition CI3 not comprising a monoacid.

[0337] In addition, composition CI4 showed a reduction in residues and hence of adherence problems which may arise with devices for transporting metal parts which have been subjected to a metalworking process.

Examples

example 1

Measurement of VOC Emissions

[0327]In this example, a lubricant composition of the invention was compared with two organic solvent-based lubricant compositions used for the deforming of metal parts.

[0328]Table 1 gives the details of the tested compositions, the percentages being weight percentages relative to the total weight of the composition.

TABLE 1CC1CC2CI1Mineral oil of petroleum origin76%Ester24%24%Isoparaffinic oil of petroleum origin76%Water70.74%  PAG110%PAG210%Alkoxylated fatty alcohol 1%Alkanolamine4.6% C7-C11 aliphatic monoacid 3%Additive package0.66%  

[0329]Tests were conducting conforming to standard EN NF 12619, weighing 3 g of product and testing two temperatures: 30° C. and 80° C.

[0330]Total VOC emissions, converted to ppm, are given in Table 2 for the three tested compositions and for the two tested temperatures.

TABLE 2CC1CC2CI1VOC emissions at 30° C.192160VOC emissions at 80° C.44124040

[0331]The results in Table 2 show that the lubricant composition of the inventio...

example 2

Staining Tests on Aluminium Sheets

[0332]In this example, staining tests were set up to determine any staining by the lubricant composition on a part in aluminium.

[0333]Table 3 gives the details of the tested lubricant compositions in this example.

TABLE 3CC3CI2CI3CI4Water72.95%70.45%   70.45%   71.45%   PAG15%5%2%PAG215% 15% 6%PAG3  20%PAG48%Alkoxylated fatty1%1%1%alcoholCastor oil   5%Salt derived from 1.5%triazineAlkanolamine4.6%  4.6%  4.6%  C7-C11 aliphatic3%3%monoacidC7-C11 aliphatic3%diacidGlycerine3%Additive package0.550.95%  0.95%  0.95%  

[0334]Staining was assessed by spraying the lubricant composition onto a sheet of aluminium and placing said sheet in an oven heated to 350° C., and leaving the plate at 350° C. for ten minutes. The extent of staining was evaluated by allocating a score of 0 (no stain) up to 5 (very stained).

[0335]Composition CI1 described in Table 1 and the compositions of Table 3 were evaluated, and the results are given in Table 4.

TABLE 4CC3CI1CI2CI3CI4St...

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to an aqueous lubricant intended to be used for metalworking, in particular for the deformation of metal parts, or for forming, cutting, stamping, or rolling metal parts, in particular in aluminium or steel.STATE OF THE ART

[0002] For metalworking, and in particular for deformation operations and particularly on aluminium, products are available that are based on formulas comprising a solvent and a fat. The solvent is generally used as vector allowing deposition of the fat used for lubrication on the surface of the metal, the solvent evaporating throughout the operation.

[0003] However, these products comprising non-aqueous solvents can prove to be toxic and hence pose a potential health risk. The presence of these non-aqueous solvents can also lead to the marketing of products requiring labelling and hence the need for persons using these products to wear protective equipment, in particular individual protective equipment when handling the product.

[0004] In addition, these products based on non-aqueous solvents can be difficult to clean and therefore require the use of specific cleaning products that are complex to apply. There is therefore a need to provide a lubricant composition, in particular for metalworking, which can overcome the disadvantages of the prior art by limiting the use of solvent, in particular a toxic or potentially toxic solvent.

[0005] It is one objective of the present invention to provide a lubricant composition, in particular a lubricant composition for metalworking, which limits the use of non-aqueous solvent, in particular a toxic or potentially toxic solvent, thereby being of improved environmentally-friendly design.

[0006] Aqueous-based formulations have been proposed to limit the use of organic solvent.

[0007] Aqueous-based formulations currently on the market do not always meet the expectations of operators in the field of deformation of metal parts in aluminium in particular, with respect to the quality of the metal parts since they are likely to generate staining problems during heat treatment, heat treatment generally being performed after deformation of a metal piece, in particular a piece in aluminium.

[0008] Tests implemented with products chiefly designed for steel can display limits on aluminium which is a softer material requiring the addition of specific additives.

[0009] Document WO 2017 / 114827 describes an aqueous formulation comprising an alkoxylated fatty alcohol and an anti-corrosion agent.

[0010] The present invention proposes a lubricant composition having improved lubricating properties for the deformation of metal parts, particularly in aluminium and steel, the composition generating little or no volatile organic compounds (VOCs) when heated and in particular up to 80° C.SUMMARY OF THE INVENTION

[0011] The invention concerns a lubricant composition comprising water and:

[0012] from 1 to 60 weight % of polyalkylene glycol,

[0013] from 0.1 to 30 weight % of alkoxylated fatty alcohol(s),

[0014] from 0.1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0015] relative to the total weight of the lubricant composition.

[0016] In one embodiment, the lubricant composition of the invention comprises water and:

[0017] from 1 to 60 weight % of polyalkylene glycol comprising alkylene oxide repeat units having 2 to 8 carbon atoms,

[0018] from 0.1 to 20 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0019] from 0.1 to 30 weight % of an anti-corrosion system comprising at least one carboxylic monoacid and at least one amine,

[0020] relative to the total weight of the lubricant composition.

[0021] In one embodiment, the lubricant composition of the invention is a ready-to-use composition comprising water and:

[0022] from 1 to 30 weight % of polyalkylene glycol,

[0023] from 0.1 to 10 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0024] from 0.1 to 15 weight % of the anti-corrosion system,

[0025] relative to the total weight of the lubricant composition.

[0026] In one embodiment, the lubricant composition of the invention is a concentrated composition comprising water and:

[0027] from 30 to 60 weight % of polyalkylene glycol,

[0028] from 1 to 15 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0029] from 10 to 30 weight % of the anti-corrosion system,

[0030] relative to the total weight of the lubricant composition.

[0031] Preferably, said at least one base is chosen from among alkanolamines, preferably from among monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof.

[0032] Preferably, the polyalkylene glycol(s) are chosen from among poly(ethylene glycol)s, poly(propylene glycol)s, block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units, and mixtures thereof, preferably from among block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units and mixtures thereof, more preferably from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof.

[0033] Preferably, each polyalkylene glycol has a molecular mass ranging from 500 to 10000 g / mol, preferably from 800 to 5000 g / mol, more preferably from 1000 to 3000 g / mol.

[0034] Preferably, each polyalkylene glycol has viscosity at 40° C. ranging from 10 to 1000 mm2 / s, preferably from 15 to 500 mm2 / s, more preferably from 20 to 400 mm2 / s.

[0035] Preferably, the alkoxylated fatty alcohol(s) are chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof.

[0036] Preferably, each alkoxylated fatty alcohol comprises 1 to 20 alkoxylated repeat units and / or a hydrocarbon chain having 6 to 24 carbon atoms.

[0037] In one embodiment, the lubricant composition of the invention further comprises at least one polyol, preferably glycerol, preferably in a proportion ranging from 0.1 to 15 weight %, more preferably from 0.5 to 10 weight % relative to the total weight of the lubricant composition.

[0038] In one embodiment, the lubricant composition of the invention is a ready-to-use composition comprising water and:

[0039] from 5 to 30 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0040] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0041] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0042] from 0.05 to 10 weight % of alkanolamine(s) chosen from among monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof,

[0043] relative to the total weight of the lubricant composition.

[0044] In one embodiment, the lubricant composition of the invention is a concentrated composition comprising water and:

[0045] from 30 to 60 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0046] from 1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0047] from 5 to 15 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0048] from 5 to 15 weight % of alkanolamine(s) chosen from among monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof,

[0049] relative to the total weight of the lubricant composition.

[0050] In one embodiment, the lubricant composition of the invention is characterized by emissions of total volatile organic compounds at 80° C. according to standard NF EN 12619 (2013) thar are lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm.

[0051] The invention further concerns the use of the lubricant composition of the invention as fluid for metalworking, in particular for the deformation of metals and / or for metal forming and / or for metal cutting and / or for metal stamping and / or for metal rolling, the metals preferably being chosen from among steel and aluminium.

[0052] Preferably, the emissions of total volatile organic compounds at 80° C. according to standard NF EN 12619 (2013) are lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm.

[0053] A further subject of the invention is the use of the lubricant composition of the invention to improve the eco-efficiency of a process comprising at least one metalworking step, wherein eco-efficiency is chosen from among:

[0054] reducing the energy consumed to implement the process,

[0055] increasing the productivity of the process,

[0056] improving the safety of operators of the process,the eco-efficiency being particularly selected from improvement in the safety of operators of the process.

[0057] The invention allows to provide a multi-service lubricant composition since it can be implemented on different types of metal surfaces, in particular aluminium surfaces and steel surfaces.

[0058] The invention allows the provision of a lubricant composition having a good toxicological profile and low environmental impact.

[0059] The lubricant composition of the invention generates very few volatile organic compounds (VOCs), even no VOCs at all when heated.

[0060] The invention allows the provision of a lubricant composition which does not generate oil deposits on the floor, thereby increasing the safety of operators and improving the eco-design aspect of the composition.

[0061] The lubricant composition of the invention is scarcely staining, or is even non-staining, generating very few or no stains when used on metal parts, in particular at the time of post-treatments on aluminium.

[0062] The lubricant composition of the invention can be used for the deforming of metal parts of narrow thickness, for example for the forming of heat exchangers.DETAILED DESCRIPTION OF THE INVENTION

[0063] The invention concerns a lubricant composition comprising water and:

[0064] from 1 to 60 weight %, preferably 5 to 60 weight % of polyalkylene glycol (PAG),

[0065] from 0.1 to 30 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohol(s),

[0066] from 0.1 to 30 weight %, preferably 1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0067] relative to the total weight of the lubricant composition.

[0068] The lubricant composition of the invention can be a ready-to-use composition or a concentrated composition, also called a composition to be diluted.

[0069] Indeed, the lubricant composition of the invention can be diluted by adding water before it is used as fluid for metalworking.

[0070] If the composition is ready-to-use, it can be used directly as metalworking fluid without requiring dilution.

[0071] If the composition is a ready-to-use composition, it preferably comprises water and:

[0072] from 1 to 30 weight %, preferably 5 to 25 weight % of polyalkylene glycol,

[0073] from 0.1 to 10 weight %, preferably 0.5 to 5 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0074] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of the anti-corrosion system,

[0075] relative to the total weight of the lubricant composition.

[0076] If the composition is a composition to be diluted (concentrated), it preferably comprises water and:

[0077] from 30 to 60 weight %, preferably 35 to 55 weight % of polyalkylene glycol,

[0078] from 1 to 15 weight %, preferably 1.5 to 10 weight % of ethoxylated and / or propoxylated fatty alcohol(s),

[0079] from 10 to 30 weight %, preferably 15 to 25 weight % of the anti-corrosion system,

[0080] relative to the total weight of the lubricant composition.Polyalkylene Glycol (PAG)

[0081] The lubricant composition of the invention comprises at least one PAG. The PAG can be a polymer or copolymer. If it is a copolymer, it can be a statistical copolymer or block copolymer.

[0082] In one embodiment, the PAG(s) of the lubricant composition of the invention are chosen from among PAGs comprising alkylene oxide repeat units having 2 to 12 carbon atoms, preferably 2 to 8 carbon atoms, more preferably 2 to 4 carbon atoms.

[0083] Typically, in 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 has 1 to 5 carbon atoms.

[0084] In one embodiment, the PAG(s) used in the lubricant composition of the invention meet formula (I):where:

[0086] R and R′ are each independently a hydrogen atom, or linear or branched alkyl group having 1 to 5 carbon atoms;

[0087] A, all the same or different, are a linear or branched alkyl group having 2 to 8 carbon atoms;

[0088] z is an integer higher than or equal to 2, preferably an integer higher than or equal to 4.

[0089] In one embodiment, the PAG(s) of the lubricant composition of the invention are chosen from among poly(ethylene glycol(s) (PEGs), poly(propylene glycol(s) (PPGs), block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units, and mixtures thereof, preferably from among block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units, and mixtures thereof, more preferably from among diblock ethylene oxide-propylene oxide copolymers, triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and triblock ethylene oxide-propylene oxide-ethylene oxide copolymers, and mixtures thereof.

[0090] By «block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units» in the meaning of the present invention, it is meant copolymers comprising at least one block derived from polymerization of ethylene glycol and at least one block derived from polymerization of propylene glycol. They can then be called PEG / PPG.

[0091] By «diblock ethylene oxide-propylene oxide copolymers» in the meaning of the present invention, it is meant copolymers composed of two blocks, one block derived from polymerization of ethylene glycol and one block derived from polymerization of propylene glycol. They can then be called PEG-PPG.

[0092] By «triblock propylene oxide-ethylene oxide-propylene oxide copolymers» in the meaning of the present invention, it is meant copolymers composed of three blocks in sequence one block derived from polymerization of propylene glycol, one block derived from polymerization of ethylene glycol and one block derived from polymerization of propylene glycol (in this order). They can then be called PPG-PEG-PPG.

[0093] By «triblock ethylene oxide-propylene oxide-ethylene oxide copolymers» in the meaning of the present invention, it is meant copolymers composed of three blocks in sequence, one block derived from polymerization of ethylene glycol, one block derived from polymerization of propylene glycol and one block derived from polymerization of ethylene glycol (in this order). They can then be called PEG-PPG-PEG.

[0094] The PAG(s) used in the invention may optionally comprise terminal alkyl groups, chosen for example from among linear or branched alkyls having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms.

[0095] Preferably, the lubricant composition of the invention comprises at least one PAG comprising a terminal alkyl group having 1 to 5 carbon atoms.

[0096] In one embodiment, the PAG(s) used in the lubricant composition of the invention meet one of formulas (II) to (V):where:

[0098] R and R′ are each independently a hydrogen atom, or saturated, linear or branched alkyl group having 1 to 5 carbon atoms;

[0099] x and x′, identical or different, are an integer higher than or equal to 2, preferably higher than or equal to 4,

[0100] y and y′, identical or different, are an integer higher than or equal to 2.

[0101] Preferably, in the compounds of formula (II), (III), (IV) or (V) of the invention, x, x′, y, and y′ are each independently an integer ranging from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20.

[0102] 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.

[0103] 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.

[0104] In one embodiment, each PAG included in the lubricant composition of the invention has a molecular mass ranging from 500 to 10000 g / mol, preferably from 700 to 5000 g / mol, more preferably from 1000 to 3000 g / mol.

[0105] In one embodiment, each PAG included in the lubricant composition of the invention has viscosity at 40° C. ranging from 8 to 1000 mm2 / s, preferably from 10 to 500 mm2 / s, more preferably from 10 to 400 mm2 / s.

[0106] Viscosity at 40° C. can be measured according to standard ASTM D7042.

[0107] In one embodiment, each PAG included in the lubricant composition of the invention has a pour point lower than 0° C., preferably lower than −15° C., more preferably lower than −20° C.

[0108] Pour point can be measured according to standard ISO 3016.

[0109] In one embodiment, each PAG included in the lubricant composition of 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.

[0110] Cloud point can be measured according to standard NF EN 1890.

[0111] The PAG(s) represent from 1 to 60 weight %, preferably 5 to 60 weight % of the total weight of the lubricant composition (expressed as 100 weight %).

[0112] PAG(s) are commercially available products.Alkoxylated Fatty Alcohol(s)

[0113] In one embodiment, the alkoxylated fatty alcohol(s) (also called polyalkoxylated fatty alcohols) are chosen from among ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof.

[0114] In the present invention, the alkoxylated fatty alcohols differ from the PAGs.

[0115] Typically, the alkoxylated fatty alcohols of the lubricant composition are in the form of a mixture of fatty alcohols comprising a distribution of compounds differing through the number of alkoxylate repeat units.

[0116] In one embodiment, each alkoxylated fatty alcohol comprises from 1 to 20 alkoxylate repeat units, preferably 1 to 10 alkoxylate repeat units, the alkoxylate repeat units preferably being chosen from among ethoxylate repeat units, propoxylate repeat units and mixture thereof.

[0117] In one preferred embodiment, the alkoxylated fatty alcohols used in the lubricant composition of the invention comprise ethoxylate repeat units optionally in combination with propoxylate repeat units. Ethoxylate repeat units allow the obtaining of good water solubility.

[0118] In one embodiment, each alkoxylated fatty alcohol has an aliphatic hydrocarbon chain having 6 to 24 carbon atoms, preferably 6 to 16 carbon atoms.

[0119] The lubricant composition of the invention may comprise a mixture of alkoxylated fatty alcohols in which the alkoxylated fatty alcohols differ from each other through the length of the hydrocarbon chain. In this embodiment, the hydrocarbon chain, preferably of alkyl type, has 6 to 18 carbon atoms, preferably 6 to 14 carbon atoms.

[0120] In one 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.

[0121] The alkoxylated fatty alcohols represent from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of the total weight of the lubricant composition (expressed as 100 weight %).

[0122] The alkoxylated fatty alcohols are commercially available products.Anti-Corrosion System

[0123] The anti-corrosion system used in the lubricant composition of the present invention comprises a least one acid and at least one base.

[0124] Among acids, mention can be made of aliphatic monocarboxylic acids, in particular having 4 to 15 carbon atoms, e.g. octanoic acid or isononanoic acid, aliphatic dicarboxylic acids having 4 to 15 carbon atoms e.g. decanedioic acid (sebacic acid), undecanedioic acid, dodecanedioic acid, isononanoic acid, and mixtures thereof.

[0125] Preferably, the acid of the anti-corrosion system used in the invention is a saturated acid.

[0126] Preferably the acid of the anti-corrosion system used in the invention is composed of carbon, hydrogen, and oxygen atoms.

[0127] Preferably, the acids are chosen from among monoacids. Staining problems may arise with diacids.

[0128] Among bases, mention can be made of amines, in particular alkanolamines and amino alcohols, potassium hydroxide and sodium hydroxide. The base(s) can be chosen from among potash, sodium hydroxide, 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 ethylene diamine (EDA), diethylene triamine (DETA), triethylene tetramine (TETA) and tetraethylene pentamine (TEPA), cyclamines, such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof.

[0129] In one embodiment, the base(s) are chosen from among monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), triethanolamine (TEA), diglycolamine (DGA), isopropanolamines such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA) and triisopropanolamine (TIPA), ethylene amines such as ethylene diamine (EDA), diethylene triamine (DETA), triethylene tetramine (TETA) and tetraethylene pentamine (TEPA), cyclamines such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and mixtures thereof.

[0130] In one preferred embodiment, the lubricant composition comprises:

[0131] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 0.5 to 7 weight % of acid(s), and

[0132] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of base(s),

[0133] relative to the total weight of the lubricant composition.

[0134] In one preferred embodiment, the lubricant composition comprises:

[0135] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 0.5 to 7 weight % of aliphatic carboxylic acid(s), and

[0136] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of amine(s),

[0137] relative to the total weight of the lubricant composition.

[0138] In one preferred embodiment, the lubricant composition comprises:

[0139] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of aliphatic monocarboxylic acid(s), and

[0140] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 7 weight % of alkanolamine(s),

[0141] relative to the total weight of the lubricant composition.

[0142] In one preferred embodiment, the lubricant composition comprises:

[0143] from 0.05 to 10 weight %, preferably 0.1 to 7 weight %, more preferably 0.5 to 5 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0144] from 0.05 to 10 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 10 weight % of alkanolamine(s) chosen from among 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,

[0145] relative to the total weight of the lubricant composition.

[0146] In one preferred embodiment, the lubricant composition comprises:

[0147] from 0.05 to 10 weight %, preferably 0.1 to 7 weight %, more preferably 0.5 to 5 weight % of saturated aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0148] from 0.05 to 10 weight %, preferably 0.1 to 10 weight %, more preferably 1 to 10 weight % of alkanolamine(s) chosen from among 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,

[0149] relative to the total weight of the lubricant composition.

[0150] In one embodiment, the acid / base weight 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.

[0151] Preferably, the anti-corrosion system is chosen so as to maintain the pH of the lubricant composition at an alkaline pH i.e. a pH ranging from 8 to 11, preferably 8 to 10.

[0152] The acid / base anti-corrosion system represents from 0.1 to 30 weight %, preferably 1 to 30 weight % of the total weight of the lubricant composition (expressed as 100 weight %).Polyol

[0153] In one embodiment, the lubricant composition of the invention additionally comprises at least one polyol having 2 to 8 carbon atoms and at least two hydroxyl functions.

[0154] In the present invention, the polyol does not comprise an ether function.

[0155] The polyol is preferably glycerol.

[0156] In the present invention, the glycerol also includes glycerine.

[0157] Therefore, in one particular embodiment, the lubricant composition of the invention additionally comprises glycerol.

[0158] Preferably the polyol, more preferably glycerol, represents from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of the weight of the lubricant composition of the invention.

[0159] If the composition is ready-to-use, preferably the polyol, more preferably glycerol, represents 0.1 to 10 weight %, more preferably 0.5 to 5 weight % of the weight of the lubricant composition of the invention.

[0160] If the composition is concentrated (therefore to be diluted), preferably the polyol, more preferable glycerol, represents from 1 to 15 weight %, more preferably 2 to 10 weight % of the weight of the lubricant composition of the invention.

[0161] The inventors have discovered that a polyol such as glycerol added to the lubricant composition comprising at least one PAG, at least one fatty alcohol and an anticorrosion system, allows an improvement in the metalworking process by reducing residues and therefore by reducing problems of adherence which may arise during transport of a metal part after a metalworking process.Lubricant Composition

[0162] The lubricant composition of the invention is an aqueous lubricant composition. Water can represent 10 to 95 weight % of the total weight of the lubricant composition.

[0163] If the composition is a ready-to-use composition, the water preferably represents 40 to 95 weight %, preferably 50 to 90 weight % of the total weight of the lubricant composition.

[0164] If the composition is a concentrated composition (to be diluted), the water preferably represents 10 to 50 weight %, preferably 10 to 30 weight % of the total weight of the lubricant composition.

[0165] The lubricant composition of the invention may additionally comprise at least one additive chosen from among additives conventionally used by skilled persons in lubricant compositions for metalworking, preferably at least one additive chosen from among defoamers, biocides, wetting agents, friction modifiers, antifreeze additives, anti-corrosion agents differing from the acid-base systems, and mixture thereof.

[0166] In one embodiment, the lubricant composition of the invention additionally comprises at least one additive chosen from among antifoams, anticorrosion agents of benzotriazole or tolyltriazole type, and biocides, alone or in a mixture, preferably in a total amount ranging from 0.01 to 5 weight %, preferably 0.05 to 3 weight % relative to the total weight of the lubricant composition.

[0167] In one embodiment, the viscosity at 40° C. of the lubricant composition ranges from 1 to 20 mm2 / s, preferably from 1.5 to 5 mm2 / s.

[0168] Viscosity at 40° C. of the lubricant composition can be measured according to standard ASTM D7042.

[0169] In one embodiment, the lubricant composition of the invention comprises water and:

[0170] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkaline oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0171] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0172] from 0.1 to 30 weight %, preferably 1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0173] relative to the total weight of the lubricant composition.

[0174] In one embodiment, the lubricant composition of the invention comprises water and:

[0175] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0176] from 0.1 to 20 weight %, preferably 0.1 to 15 weights % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0177] from 0.1 to 30 weight %, preferably 1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,

[0178] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0179] relative to the total weight of the lubricant composition.

[0180] In one embodiment, the lubricant composition of the invention comprises water and:

[0181] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0182] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0183] from 0.5 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s),

[0184] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0185] relative to the total weight of the lubricant composition.

[0186] In one embodiment, the lubricant composition of the invention comprises water and:

[0187] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0188] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof,

[0189] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s) constituted by carbon, hydrogen and oxygen atoms,

[0190] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0191] relative to the total weight of the lubricant composition.

[0192] In one embodiment, the lubricant composition of the invention comprises water and:

[0193] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0194] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0195] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s),

[0196] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0197] relative to the total weight of the lubricant composition.

[0198] In one embodiment, the lubricant composition of the invention comprises water and:

[0199] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0200] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0201] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic carboxylic acid(s),

[0202] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0203] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0204] relative to the total weight of the lubricant composition.

[0205] In one embodiment, the lubricant composition of the invention comprises water and:

[0206] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two alkyl terminal groups, the same or different, having 1 to 5 carbon atoms,

[0207] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms,

[0208] from 0.05 to 15 weight %, preferably 0.1 to 10 weight %, more preferably 0.5 to 5 weights % of aliphatic carboxylic acid(s),

[0209] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of amine(s),

[0210] relative to the total weight of the lubricant composition.

[0211] In one embodiment, the lubricant composition of the invention comprises water and:

[0212] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0213] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0214] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s), and

[0215] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamines(s),

[0216] relative to the total weight of the lubricant composition.

[0217] In one embodiment, the lubricant composition of the invention comprises water and:

[0218] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0219] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0220] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s), and

[0221] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s),

[0222] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0223] relative to the total weight of the lubricant composition.

[0224] In one embodiment, the lubricant composition of the invention comprises water and:

[0225] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0226] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0227] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0228] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0229] relative to the total weight of the lubricant composition.

[0230] In one embodiment, the lubricant composition of the invention comprises water and:

[0231] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof,

[0232] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0233] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s), and

[0234] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s),

[0235] relative to the total weight of the lubricant composition.

[0236] In one embodiment, the lubricant composition of the invention comprises water and:

[0237] from 1 to 60 weight %, preferably 5 to 60 weight % of PAG chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof,

[0238] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof,

[0239] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0240] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0241] relative to the total weight of the lubricant composition.

[0242] In one embodiment, the lubricant composition of the invention comprises water and:

[0243] from 1 to 60 weight %, preferably 5 to 60 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0244] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0245] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0246] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0247] relative to the total weight of the lubricant composition.

[0248] In one embodiment, the lubricant composition of the invention comprises water and:

[0249] from 1 to 60 weight %, preferably 5 to 60 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0250] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0251] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0252] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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, and

[0253] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0254] relative to the total weight of the lubricant composition.

[0255] If the composition is a ready-to-use composition, in one embodiment the lubricant composition of the invention comprises water and:

[0256] from 1 to 30 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0257] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0258] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0259] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0260] relative to the total weight of the lubricant composition.

[0261] If the composition is a ready-to-use composition, in one embodiment the lubricant composition of the invention comprises water and:

[0262] from 1 to 30 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixture thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,

[0263] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,

[0264] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0265] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0266] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0267] relative to the total weight of the lubricant composition.

[0268] In one embodiment, the lubricant composition of the invention comprises water and:

[0269] from 1 to 60 weight %, preferably 5 to 60 weight % of PAGs comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal alkyl groups, the same or different, having 1 to 5 carbon atoms,

[0270] from 0.1 to 20 weight %, preferably 0.1 to 15 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms,

[0271] from 0.05 to 15 weight %, preferably 0.1 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0272] from 0.05 to 15 weight %, preferably 0.1 to 12 weight % of alkanolamine(s) chosen from among 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,

[0273] relative to the total weight of the lubricant composition.

[0274] If the composition is a ready-to-use composition, according to one embodiment, the lubricant composition of the invention comprises water and:

[0275] from 1 to 30 weight % of PAGS comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal alkyl groups, the same or different, having 1 to 5 carbon atoms,

[0276] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms, and

[0277] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0278] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0279] relative to the total weight of the lubricant composition.

[0280] If the composition is a ready-to-use composition, according to one embodiment, the lubricant composition of the invention comprises water and:

[0281] from 1 to 30 weight % of PAGs comprising alkylene oxide repeat units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, said PAGs being terminated by one or two terminal alkyl groups, the same or different, having 1 to 5 carbon atoms,

[0282] from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said fatty alcohols comprising a hydrocarbon chain having 6 to 24 carbon atoms,

[0283] from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, and

[0284] from 0.05 to 10 weight % of alkanolamine(s) chosen from among 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,

[0285] from 0.1 to 15 weight %, preferably 0.5 to 10 weight % of polyol, preferably glycerol,

[0286] relative to the total weight of the lubricant composition.

[0287] Preferably, the lubricant composition of the invention is in the form of a solution. The ingredients of the lubricant composition are preferably water-soluble or solubilised in water.

[0288] In the meaning of the present invention, a «solution» differs from an emulsion or a dispersion possibly containing several phases or possibly containing non-solubilised particles.

[0289] In one embodiment, the aqueous lubricant composition of the invention is not an emulsion.

[0290] The lubricant composition of the invention can be prepared by simply mixing the ingredients using any method known to skilled persons to obtain a solution.Applications

[0291] The invention also concerns the use of the lubricant composition of the invention as fluid for metalworking, in particular for the deformation of metal parts and / or for the forming of metal parts and / or for the cutting metal parts and / or for the stamping of metal parts and / or for the rolling of metal parts, the metals preferably being chosen from among steel and aluminium.

[0292] It is to be noted that the lubricant composition can be diluted with water before use as fluid for metalworking.

[0293] The present invention also concerns a method for lubricating at least one surface of a metal part, notably in aluminium or steel, comprising contacting the lubricant composition with said metal surface.

[0294] Preferably, the contacting step is performed by spraying the lubricant composition or by depositing the lubricant composition on the metal surface, depositing possibly being carried out using a roller or brush.

[0295] Preferably the metal surface is a surface in aluminium or steel.

[0296] The metal parts are preferably of narrow thickness, for example a thickness of 5 μm or less, preferably of 3 μm or less, more preferably a thickness ranging from 0.35 to 1.5 μm.

[0297] It is to be noted that the lubrication method may comprise a step to dilute the lubricant composition with water before the contacting step of the (diluted) lubricant composition with said metal surface.

[0298] The inventors have observed that the combination of PAG, alkoxylated fatty alcohol and an acid / base anti-corrosion system allows a lubricant composition to be obtained having reduced and even zero VOC emissions, even when heated to 80° C., said composition having excellent lubricating properties for metalworking, and in particular for deformation of metals.

[0299] The lubricant composition of the invention therefore has versatility in that it can be used both for the deformation of steel and for the deformation of aluminium.

[0300] In one embodiment, the lubricating method additionally comprises a heat treatment step of the metal part, after the contacting step. For example, heat treatment can entail heating to a temperature of at least 150° C., even at least 200° C. even at least 300° C. This embodiment including a heat treatment step is particularly well adapted when the metal part is a part in aluminium.

[0301] The lubricant composition of the invention can also be used to provide deformed metal parts without staining said metal parts, in particular when the part is in aluminium.

[0302] The PAG(s) employed for the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0303] The alkoxylated fatty alcohol(s) employed for the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0304] The anti-corrosion system employed for the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0305] The lubricant composition resulting from the aforementioned use can have one or more of the characteristics and preferences described above relating to the lubricant composition of the invention.

[0306] A further subject of the invention is the use of the lubricant composition of the invention to improve the eco-efficiency of a process comprising at least one metalworking step, wherein eco-efficiency is chosen from among:

[0307] reducing the energy consumed to implement the process,

[0308] increasing the productivity of the process,

[0309] improving the safety of operators of the process,the eco-efficiency being particularly chosen from an improvement in the safety of operators of the process.

[0310] By reducing VOC emissions, this leads in fine to reducing energy consumption and thereby takes part in reducing global warming.

[0311] By reducing staining, it is possible to obtain better productivity.

[0312] Additionally, the use of an aqueous solvent as compared with an organic solvent allows improved safety for operators and obviates the need for an oven drying step at high temperature.

[0313] The metalworking step may comprise the deformation of metals parts and / or the forming of metal parts and / or the cutting of metal parts and / or the stamping of metal parts and / or the rolling of metal parts, the metals preferably being chosen from among steel and aluminium.

[0314] In other words, the lubricant composition of the invention allows a reduction in the environmental impact of a process comprising at least one metalworking step.EXAMPLES

[0315] In the remainder of the present description, examples are given to illustrate the present invention which do not in any manner limit the scope thereof.In the examples, the following ingredients were used:PAG1 designates a linear poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units in an EO / PO ratio of about 1:1, PAG1 being terminated by methyl and butyl groups, PAG1 having a molecular mass ranging from 1000 to 2000 g / mol.

[0317] PAG2 designates a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units in an EO / PO ratio of about 1:1, PAG2 being terminated by a butyl group at one end and a hydroxyl group at the other end, PAG2 having a molecular mass ranging from 1000 to 2000 g / mol.

[0318] PAG3 designates a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units, PAG3 being terminated by an alkyl group at one end and a hydroxyl group at the other end, PAG3 having a molecular mass ranging from 1000 to 2500 g / mol.

[0319] PAG4 designates a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeat units in an EO / PO ratio of about 1:2, PAG4 being terminated by hydroxyl groups, PAG4 having a molecular mass ranging from 2000 to 3000 g / mol.

[0320] alkoxylated fatty alcohol designates one or more alcohols comprising propoxylate and / or ethoxylate repeat units and an aliphatic hydrocarbon chain having 12-14 carbon atoms,

[0321] alkanolamine designates one or more alkanolamines chosen from among 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,

[0322] C8-C10 aliphatic monoacid designates one or more aliphatic monocarboxylic acids having 8 to 10 carbon atoms,

[0323] C8-C10 aliphatic diacid designates one or more aliphatic dicarboxylic acids having 8 to 10 carbon atoms,

[0324] salt derived from triazine is a system comprising a fatty triacid salt derived from 1,3,5-triazine.

[0325] glycerine at 99.5%.

[0326] additive package designates a mixture of additives conventionally used in lubricant compositions for metalworking, particularly including an anti-foam and an anticorrosion agent of benzotriazole type.Example 1: Measurement of VOC Emissions

[0327] In this example, a lubricant composition of the invention was compared with two organic solvent-based lubricant compositions used for the deforming of metal parts.

[0328] Table 1 gives the details of the tested compositions, the percentages being weight percentages relative to the total weight of the composition.TABLE 1CC1CC2CI1Mineral oil of petroleum origin76%Ester24%24%Isoparaffinic oil of petroleum origin76%Water70.74%  PAG110%PAG210%Alkoxylated fatty alcohol 1%Alkanolamine4.6% C7-C11 aliphatic monoacid 3%Additive package0.66%

[0329] Tests were conducting conforming to standard EN NF 12619, weighing 3 g of product and testing two temperatures: 30° C. and 80° C.

[0330] Total VOC emissions, converted to ppm, are given in Table 2 for the three tested compositions and for the two tested temperatures.TABLE 2CC1CC2CI1VOC emissions at 30° C.192160VOC emissions at 80° C.44124040

[0331] The results in Table 2 show that the lubricant composition of the invention exhibits zero VOC emissions, even at 80° C.Example 2: Staining Tests on Aluminium Sheets

[0332] In this example, staining tests were set up to determine any staining by the lubricant composition on a part in aluminium.

[0333] Table 3 gives the details of the tested lubricant compositions in this example.TABLE 3CC3CI2CI3CI4Water72.95%70.45%   70.45%   71.45%   PAG15%5%2%PAG215% 15% 6%PAG3  20%PAG48%Alkoxylated fatty1%1%1%alcoholCastor oil   5%Salt derived from 1.5%triazineAlkanolamine4.6%  4.6%  4.6%  C7-C11 aliphatic3%3%monoacidC7-C11 aliphatic3%diacidGlycerine3%Additive package0.550.95%  0.95%  0.95%

[0334] Staining was assessed by spraying the lubricant composition onto a sheet of aluminium and placing said sheet in an oven heated to 350° C., and leaving the plate at 350° C. for ten minutes. The extent of staining was evaluated by allocating a score of 0 (no stain) up to 5 (very stained).

[0335] Composition CI1 described in Table 1 and the compositions of Table 3 were evaluated, and the results are given in Table 4.TABLE 4CC3CI1CI2CI3CI4Staining score50030

[0336] As shown by the results in Table 4, the compositions of the invention are less staining than composition CC3. In addition, compositions CI1, CI2 and CI4 comprising a monoacid are less staining than composition CI3 not comprising a monoacid.

[0337] In addition, composition CI4 showed a reduction in residues and hence of adherence problems which may arise with devices for transporting metal parts which have been subjected to a metalworking process.

Examples

example 1

Measurement of VOC Emissions

[0327]In this example, a lubricant composition of the invention was compared with two organic solvent-based lubricant compositions used for the deforming of metal parts.

[0328]Table 1 gives the details of the tested compositions, the percentages being weight percentages relative to the total weight of the composition.

TABLE 1CC1CC2CI1Mineral oil of petroleum origin76%Ester24%24%Isoparaffinic oil of petroleum origin76%Water70.74%  PAG110%PAG210%Alkoxylated fatty alcohol 1%Alkanolamine4.6% C7-C11 aliphatic monoacid 3%Additive package0.66%  

[0329]Tests were conducting conforming to standard EN NF 12619, weighing 3 g of product and testing two temperatures: 30° C. and 80° C.

[0330]Total VOC emissions, converted to ppm, are given in Table 2 for the three tested compositions and for the two tested temperatures.

TABLE 2CC1CC2CI1VOC emissions at 30° C.192160VOC emissions at 80° C.44124040

[0331]The results in Table 2 show that the lubricant composition of the inventio...

example 2

Staining Tests on Aluminium Sheets

[0332]In this example, staining tests were set up to determine any staining by the lubricant composition on a part in aluminium.

[0333]Table 3 gives the details of the tested lubricant compositions in this example.

TABLE 3CC3CI2CI3CI4Water72.95%70.45%   70.45%   71.45%   PAG15%5%2%PAG215% 15% 6%PAG3  20%PAG48%Alkoxylated fatty1%1%1%alcoholCastor oil   5%Salt derived from 1.5%triazineAlkanolamine4.6%  4.6%  4.6%  C7-C11 aliphatic3%3%monoacidC7-C11 aliphatic3%diacidGlycerine3%Additive package0.550.95%  0.95%  0.95%  

[0334]Staining was assessed by spraying the lubricant composition onto a sheet of aluminium and placing said sheet in an oven heated to 350° C., and leaving the plate at 350° C. for ten minutes. The extent of staining was evaluated by allocating a score of 0 (no stain) up to 5 (very stained).

[0335]Composition CI1 described in Table 1 and the compositions of Table 3 were evaluated, and the results are given in Table 4.

TABLE 4CC3CI1CI2CI3CI4St...

Claims

1. A lubricant composition comprising water and:from 1 to 60 weight % of polyalkylene glycol,from 0.1 to 30 weight % of alkoxylated fatty alcohol(s),from 0.1 to 30 weight % of an anti-corrosion system comprising at least one acid and at least one base,relative to the total weight of the lubricant composition.

2. The lubricant composition according to claim 1, comprising water and:from 1 to 60 weight % of polyalkylene glycol comprising alkylene oxide repeat units having 2 to 8 carbon atoms,from 0.1 to 20 weight % of ethoxylated and / or propoxylated fatty alcohol(s),from 0.1 to 30 weight % of an anti-corrosion system comprising at least one carboxylic monoacid and at least one amine,relative to the total weight of the lubricant composition.

3. The lubricant composition according to claim 1, further comprising at least one polyol.

4. The lubricant composition according to claim 1, said composition being a ready-to-use composition comprising water and:from 1 to 30 weight % of polyalkylene glycol,from 0.1 to 10 weight % of ethoxylated and / or propoxylated fatty alcohol(s),from 0.1 to 15 weight % of the anti-corrosion system,relative to the total weight of the lubricant composition.

5. The lubricant composition according to claim 1, said composition being a concentrated composition comprising water and:from 30 to 60 weight % of polyalkylene glycol,from 1 to 15 weight % of ethoxylated and / or propoxylated fatty alcohol(s),from 10 to 30 weight % of the anti-corrosion system,relative to the total weight of the lubricant composition.

6. The lubricant composition according to claim 1, wherein said at least one base is chosen from among alkanolamines.

7. The lubricant composition according to claim 1, wherein the polyalkylene glycol(s) are chosen from among poly(ethylene glycols), poly(propylene glycols), block copolymers comprising ethylene oxide repeat units and propylene oxide repeat units, and mixtures thereof.

8. The lubricant composition according to claim 1, wherein each polyalkylene glycol has a molecular mass ranging from 500 to 10000 g / mol.

9. The lubricant composition according to claim 1, wherein each polyalkylene glycol has viscosity at 40° C. ranging from 10 to 1000 mm2 / s.

10. The lubricant composition according to claim 1, wherein the alkoxylated fatty alcohol(s) are chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof.

11. The lubricant composition according to claim 1, wherein each alkoxylated fatty alcohol comprises 1 to 20 alkoxylated repeat units and / or a hydrocarbon chain having 6 to 24 carbon atoms.

12. The lubricant composition according to claim 1, said composition being a ready-to-use composition comprising water and:from 5 to 30 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,from 0.1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,from 0.05 to 10 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, andfrom 0.05 to 10 weight % of alkanolamine(s) chosen from among 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 lubricant composition.

13. The lubricant composition according to claim 1, said composition being a concentrated composition comprising water and:from 30 to 60 weight % of PAGs chosen from among diblock ethylene oxide-propylene oxide copolymers, and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, and mixtures thereof, the PAGs having a molecular mass ranging from 1000 to 3000 g / mol,from 1 to 10 weight % of alkoxylated fatty alcohols chosen from among ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixture thereof, said alkoxylated fatty alcohols having a molar mass ranging from 100 to 900 g / mol,from 5 to 15 weight % of aliphatic monocarboxylic acid(s) having 4 to 15 carbon atoms, andfrom 5 to 15 weight % of alkanolamine(s) chosen from among 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 lubricant composition.

14. The lubricant composition according to claim 1, characterized in that the emissions of total volatile organic compounds thereof at 80° C. according to standard NF EN 12619 are lower than 200 ppm.

15. A method for metalworking a metal part, the method comprising at least one step of contacting the lubricant composition according to claim 1 with a surface of the metal part, and at least one step of metal working.

16. The method according to claim 15, wherein the emissions of total volatile organic compounds at 80° C. according to standard NF EN 12619 are lower than 200 ppm.

17. A method to improve the eco-efficiency of a process comprising at least one metalworking step, the method comprising implementing the lubricant composition according to claim 1, wherein eco-efficiency is chosen from among:reducing the energy consumed when implementing the process,increasing the productivity of the process,improving the safety of operators of the process.

18. The lubricant composition according to claim 3, wherein the polyol is a glycerol.

19. The lubricant composition according to claim 3, wherein the polyol is employed in a proportion ranging from 0.1 to 15 weight %, relative to the total weight of the lubricant composition.

20. The method according to claim 15, wherein step of metalworking is a step selected from metal deformation and / or metal forming and / or metal cutting and / or metal stamping and / or metal rolling.

Images