Aqueous lubricant for metal processing

Abstract

The present invention relates to a lubricant composition comprising water and, relative to the total weight of the lubricant composition, from 1% to 60% by weight of a polyalkylene glycol, from 0.1% to 30% by weight of an alkoxylated fatty alcohol, from 0.1% to 30% by weight of a preservative system comprising at least one acid and at least one base. The invention also relates to the use of the lubricant composition according to the invention for metal working.

Description

Technical Field

[0001] The invention relates to an aqueous lubricant for metalworking, in particular for deforming metal parts, or for forming, cutting, stamping or rolling metal parts, in particular in aluminium or steel. Background Art

[0002] For metalworking, especially deformation operations, and especially aluminum, products based on formulations containing solvents and fats can be used. The solvent generally acts as a carrier, allowing the fat used for lubrication to be deposited on the metal surface, the solvent evaporating throughout the operation.

[0003] However, these products containing non-aqueous solvents can prove to be toxic, thus posing a potential health risk. The presence of these non-aqueous solvents can also lead to the marketing of products that require labeling, so that people using these products need to wear protective equipment, especially personal protective equipment when handling the products.

[0004] Furthermore, these non-aqueous solvent based products can be difficult to clean, thus requiring the use of specialized cleaning products that are complex to apply.Therefore, there is a need to provide a lubricant composition, particularly for metalworking, that overcomes the shortcomings of the prior art by limiting the use of solvents, particularly toxic or potentially toxic solvents.

[0005] An object of the present invention is to provide a lubricant composition, in particular a lubricant composition for metalworking, which limits the use of non-aqueous solvents, in particular toxic or potentially toxic solvents, thereby having an improved environmental design.

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

[0007] The water-based preparations currently on the market do not always meet the expectations of operators in the field of deformation of aluminum metal parts, especially in terms of the quality of the metal parts, because they may cause staining problems during the heat treatment process, which is generally carried out after the deformation of metal parts, especially aluminum parts.

[0008] Testing of products designed primarily for steel can show the limitations of aluminum, a softer material that requires specific additives.

[0009] Document WO 2017 / 114827 describes an aqueous preparation comprising an alkoxylated fatty alcohol and a preservative.

[0010] The present invention provides a lubricant composition having improved lubrication properties for deformation of metal parts, particularly in aluminum and steel, which composition generates little or no volatile organic compounds (VOC) when heated, particularly up to 80°C. Summary of the invention

[0011] The present invention relates to a lubricant composition comprising water and:

[0012] - 1% to 60% by weight of polyalkylene glycol, relative to the total weight of the lubricant composition,

[0013] - 0.1% to 30% by weight of alkoxylated fatty alcohols, relative to the total weight of the lubricant composition,

[0014] 0.1% to 30% by weight, relative to the total weight of the lubricant composition, of an anti-corrosion system comprising at least one acid and at least one base.

[0015] In one embodiment, the lubricant composition of the present invention comprises water and:

[0016] - 1% to 60% by weight of polyalkylene glycol, relative to the total weight of the lubricant composition, said polyalkylene glycol comprising alkylene oxide repeating units having from 2 to 8 carbon atoms,

[0017] - 0.1% to 20% by weight of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition,

[0018] 0.1 to 30% by weight, relative to the total weight of the lubricant composition, of an anticorrosion system comprising at least one monocarboxylic acid and at least one amine.

[0019] In one embodiment, the lubricant composition of the present invention is a ready-to-use composition comprising water and:

[0020] - 1% to 30% by weight of polyalkylene glycol, relative to the total weight of the lubricant composition,

[0021] - 0.1% to 10% by weight of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition,

[0022] - 0.1% to 15% by weight of said anti-corrosion system relative to the total weight of said lubricant composition.

[0023] In one embodiment, the lubricant composition of the present invention is a concentrated composition comprising water and:

[0024] - 30% to 60% by weight of polyalkylene glycols relative to the total weight of the lubricant composition,

[0025] - 1 to 15% by weight of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition,

[0026] - 10% to 30% by weight of said anti-corrosion system relative to the total weight of said lubricant composition.

[0027] Preferably, the at least one base is selected from alkanolamines, preferably from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0028] Preferably, the polyalkylene glycol is selected from polyethylene glycol, polypropylene glycol, a block copolymer comprising ethylene oxide repeating units and propylene oxide repeating units, and a mixture thereof, preferably the polyalkylene glycol is selected from a block copolymer comprising ethylene oxide repeating units and propylene oxide repeating units, and a mixture thereof, more preferably the polyalkylene glycol is selected from a diblock ethylene oxide-propylene oxide copolymer and a triblock propylene oxide-ethylene oxide-propylene oxide copolymer, and a mixture thereof.

[0029] Preferably, the molecular weight of each polyalkylene glycol ranges from 500 g / mol to 10000 g / mol, preferably from 800 g / mol to 5000 g / mol, more preferably from 1000 g / mol to 3000 g / mol.

[0030] Preferably, each polyalkylene glycol has a viscosity of 10 mm at 40°C. 2 / s to 1000mm 2 / s, preferably within 15mm 2 / s to 500mm 2 / s, more preferably within 20 mm 2 / s to 400mm 2 / s range.

[0031] Preferably, the alkoxylated fatty alcohol is selected from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof.

[0032] Preferably, each alkoxylated fatty alcohol comprises from 1 to 20 alkoxylated repeating units and / or a hydrocarbon chain having from 6 to 24 carbon atoms.

[0033] In one embodiment, the lubricant composition of the present invention further comprises at least one polyol, preferably glycerol, in a proportion ranging from 0.1 wt % to 15 wt % (more preferably 0.5 wt % to 10 wt %) relative to the total weight of the lubricant composition.

[0034] In one embodiment, the lubricant composition of the present invention is a ready-to-use composition comprising water and:

[0035] - 5 to 30 wt% of PAG, relative to the total weight of the lubricant composition, the PAG being selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, the molecular weight of the PAG being in the range of 1000 to 3000 g / mol,

[0036] 0.1% to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol,

[0037] - 0.05% to 10% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0038] 0.05% to 10% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0039] In one embodiment, the lubricant composition of the present invention is a concentrated composition comprising water and:

[0040] - 30 to 60 wt% of PAG, relative to the total weight of the lubricant composition, the PAG being selected from diblock ethylene oxide-propylene oxide copolymers, triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, the PAG having a molecular weight ranging from 1000 to 3000 g / mol,

[0041] - 1 to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 to 900 g / mol,

[0042] - 5% to 15% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0043] - 5% to 15% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0044] In one embodiment, the lubricant composition of the invention is characterized in that, according to standard NF EN 12619 (2013), the total emission of volatile organic compounds at 80° C. is lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm.

[0045] The invention further relates to the use of the lubricant composition according to the invention as a fluid for metal processing, in particular for metal deformation and / or for metal forming and / or for metal cutting and / or for metal stamping and / or for metal rolling, the metal being preferably selected from steel and aluminium.

[0046] Preferably, the total emission of volatile organic compounds at 80° C. is lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm, according to standard NF EN 12619 (2013).

[0047] A further subject of the present invention is the use of the lubricant composition according to the invention for increasing the eco-efficiency of a process comprising at least one metalworking step, wherein the eco-efficiency is selected from:

[0048] - reduce the energy consumed in carrying out said method,

[0049] - increasing the productivity of the process,

[0050] - improve the safety of the operator of the method,

[0051] The eco-efficiency is selected in particular from the increase in safety of the operator of the method.

[0052] The present invention allows to provide a multi-purpose lubricant composition since it can be implemented on different types of metal surfaces, in particular aluminum surfaces and steel surfaces.

[0053] The present invention allows providing lubricant compositions having a good toxicological profile and a low environmental impact.

[0054] The lubricant compositions of the present invention generate very few volatile organic compounds (VOCs) when heated, or even generate no VOCs at all.

[0055] The invention allows to provide a lubricant composition which does not generate oil deposits on the floor, thus increasing the safety of the operator and improving the eco-design aspect of the composition.

[0056] The lubricant composition of the present invention has little or no staining and produces very little or no staining when used on metal parts, especially when post-treated on aluminum.

[0057] The lubricant composition of the present invention can be used for deformation of metal parts of narrow thickness, for example, for forming heat exchangers. DETAILED DESCRIPTION

[0058] The present invention relates to a lubricant composition comprising water and:

[0059] - 1% to 60% by weight (preferably 5% to 60% by weight) of polyalkylene glycol (PAG) relative to the total weight of the lubricant composition,

[0060] - 0.1% to 30% by weight (preferably 0.1% to 15% by weight) of alkoxylated fatty alcohols, relative to the total weight of the lubricant composition,

[0061] 0.1% to 30% by weight, preferably 1% to 30% by weight, relative to the total weight of the lubricant composition, of an anticorrosion system comprising at least one acid and at least one base.

[0062] The lubricant composition of the present invention may be a ready-to-use composition or a concentrated composition, also referred to as a composition to be diluted.

[0063] In fact, the lubricant composition of the present invention may be diluted by adding water before use as a fluid in metalworking.

[0064] If the composition is ready to use, it can be used directly as a metalworking fluid without dilution.

[0065] If the composition is a ready-to-use composition, the composition preferably comprises water and:

[0066] - 1% to 30% by weight (preferably 5% to 25% by weight) of polyalkylene glycol relative to the total weight of the lubricant composition,

[0067] 0.1% to 10% by weight (preferably 0.5% to 5% by weight) of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition,

[0068] 0.1% to 15% by weight, preferably 0.5% to 10% by weight, of an anti-corrosion system relative to the total weight of the lubricant composition.

[0069] If the composition is a composition to be diluted (concentrated), the composition preferably comprises water and:

[0070] - 30% to 60% by weight (preferably 35% to 55% by weight) of polyalkylene glycol relative to the total weight of the lubricant composition,

[0071] - 1% to 15% by weight (preferably 1.5% to 10% by weight) of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition,

[0072] - 10% to 30% by weight, preferably 15% to 25% by weight, of said anticorrosion system relative to the total weight of said lubricant composition.

[0073] Polyalkylene glycol (PAG)

[0074] The lubricant composition of the present invention comprises at least one PAG. The PAG may be a polymer or a copolymer. If it is a copolymer, it may be a statistical copolymer or a block copolymer.

[0075] In one embodiment, the PAG of the lubricant composition of the present invention is selected from PAGs comprising alkylene oxide repeating units having 2 to 12 carbon atoms, preferably 2 to 8 carbon atoms, more preferably 2 to 4 carbon atoms.

[0076] Typically, in the present invention, if the PAG comprises a hydroxyl type (—OH) terminal group and an alkyl type terminal group, the alkyl type terminal group has 1 to 5 carbon atoms.

[0077] In one embodiment, the PAG used in the lubricant composition of the present invention satisfies formula (I):

[0078] R-(OA) z OR'(I)

[0079] in:

[0080] R and R' are each independently a hydrogen atom or a straight or branched chain alkyl group having 1 to 5 carbon atoms;

[0081] A is a straight chain or branched chain alkyl group having 2 to 8 carbon atoms (all A's are the same or different);

[0082] z is an integer greater than or equal to 2, preferably an integer greater than or equal to 4.

[0083] In one embodiment, the PAG of the lubricant composition of the present invention is selected from polyethylene glycol (PEG), polypropylene glycol (PPG), block copolymers comprising ethylene oxide repeating units and propylene oxide repeating units, and mixtures thereof, preferably the polyalkylene glycol is selected from block polymers comprising ethylene oxide repeating units and propylene oxide repeating units, and mixtures thereof, more preferably the polyalkylene glycol is selected from 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.

[0084] "Block copolymers comprising ethylene oxide repeating units and propylene oxide repeating units" in the sense of the present invention refer to copolymers comprising at least one block derived from the polymerization of ethylene glycol and at least one block derived from the polymerization of propylene glycol. They can then be referred to as PEG / PPG.

[0085] "Diblock ethylene oxide-propylene oxide copolymers" in the sense of the present invention refer to copolymers consisting of two blocks, one block derived from the polymerization of ethylene glycol and one block derived from the polymerization of propylene glycol. They can then be referred to as PEG-PPG.

[0086] "Triblock propylene oxide-ethylene oxide-propylene oxide copolymers" in the sense of the present invention refer to copolymers consisting of three blocks in sequence, one block derived from the polymerization of propylene glycol, one block derived from the polymerization of ethylene glycol, and one block derived from the polymerization of propylene glycol (in this order). They can then be referred to as PPG-PEG-PPG.

[0087] "Triblock ethylene oxide-propylene oxide-ethylene oxide copolymers" in the sense of the present invention refer to copolymers consisting of three blocks in sequence, one block derived from the polymerization of ethylene glycol, one block derived from the polymerization of propylene glycol, and one block derived from the polymerization of ethylene glycol (in this order). They can then be referred to as PEG-PPG-PEG.

[0088] The PAG used in the present invention may optionally contain a terminal alkyl group, for example selected from a linear or branched alkyl group having 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms.

[0089] Preferably, the lubricant composition of the present invention comprises at least one PAG comprising a terminal alkyl group having from 1 to 5 carbon atoms.

[0090] In one embodiment, the PAG used in the lubricant composition of the present invention satisfies one of formulas (II) to (V):

[0091] R-(OCH2CH2) x (OCH2CH(CH3)) y OR'(II);

[0092] R-(OCH2CH(CH3)) y (OCH2CH2) x OR'(III);

[0093] R-(OCH2CH(CH3)) y (OCH2CH2) x (OCH2CH(CH3)) y’ OR'(IV);

[0094] R-(OCH2CH2) x (OCH2CH(CH3)) y (OCH2CH2) x’ OR'(V);

[0095] in:

[0096] R and R' are each independently a hydrogen atom, or a saturated straight or branched chain alkyl group having 1 to 5 carbon atoms;

[0097] x and x' are the same or different and are an integer greater than or equal to 2, preferably greater than or equal to 4,

[0098] y and y' are the same or different, and are integers greater than or equal to 2.

[0099] Preferably, in the compounds of formula (II), (III), (IV) or (V) of the present invention, x, x', y and y' are each independently an integer in the range of 2 to 30, preferably an integer in the range of 4 to 25, more preferably an integer in the range of 6 to 20.

[0100] Preferably, in formula (IV), x is an integer in the range of 2 to 30, preferably in the range of 4 to 25, advantageously in the range of 6 to 20, and the sum of y+y' is in the range of 8 to 45, preferably in the range of 12 to 40, more preferably in the range of 20 to 35.

[0101] Preferably, in formula (V), y is an integer in the range of 2 to 30, preferably an integer in the range of 4 to 25, advantageously an integer in the range of 6 to 20, and the sum of x+x' is in the range of 8 to 45, preferably 12 to 40, more preferably 20 to 35.

[0102] In one embodiment, the molecular weight of each PAG included in the lubricant composition of the present invention ranges from 500 g / mol to 10000 g / mol, preferably from 700 g / mol to 5000 g / mol, more preferably from 1000 g / mol to 3000 g / mol.

[0103] In one embodiment, each PAG included in the lubricant composition of the present invention has a viscosity at 40°C of 8 mm 2 / s to 1000mm 2 / s, preferably within 10mm 2 / s to 500mm 2 / s, more preferably within 10mm 2 / s to 400mm 2 / s range.

[0104] The viscosity at 40° C. can be measured according to standard ASTM D7042.

[0105] In one embodiment, each PAG included in the lubricant composition of the present invention has a pour point below 0°C, preferably below -15°C, more preferably below -20°C.

[0106] The pour point can be measured according to standard ISO 3016.

[0107] In one embodiment, the cloud point of each PAG included in the lubricant composition of the present invention ranges from 10°C to 120°C, preferably from 20°C to 110°C, more preferably from 40°C to 100°C.

[0108] The cloud point can be measured according to standard NF EN 1890.

[0109] The PAG accounts for 1 to 60 wt %, preferably 5 to 60 wt %, based on the total weight of the lubricant composition (expressed as 100 wt %).

[0110] PAG is a commercially available product.

[0111] Alkoxylated fatty alcohol

[0112] In one embodiment, the alkoxylated fatty alcohol (also known as polyalkoxylated fatty alcohol) is selected from the group consisting of ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixtures thereof.

[0113] In the present invention, alkoxylated fatty alcohols are distinct from PAGs.

[0114] Typically, the alkoxylated fatty alcohol in the lubricant composition is in the form of a fatty alcohol mixture comprising a distribution of compounds which differ by the number of alkoxy repeating units.

[0115] In one embodiment, each alkoxylated fatty alcohol comprises 1 to 20 alkoxylated repeating units, preferably 1 to 10 alkoxylated repeating units, the alkoxylated repeating units preferably being selected from ethoxylated repeating units, propoxylated repeating units and mixtures thereof.

[0116] In a preferred embodiment, the alkoxylated fatty alcohol used in the lubricant composition of the present invention comprises ethoxylated repeating units, optionally in combination with propoxylated repeating units. The ethoxylated repeating units allow good water solubility to be obtained.

[0117] In one embodiment, each alkoxylated fatty alcohol has an aliphatic hydrocarbon chain having from 6 to 24 carbon atoms, preferably from 6 to 16 carbon atoms.

[0118] The lubricant composition of the invention may contain a mixture of alkoxylated fatty alcohols, wherein the alkoxylated fatty alcohols differ from each other by the length of the hydrocarbon chain. In this embodiment, the hydrocarbon chain of the alkyl type preferably has 6 to 18 carbon atoms, preferably 6 to 14 carbon atoms.

[0119] In a preferred embodiment, the molar mass of the alkoxylated fatty alcohol ranges from 130 g / mol to 900 g / mol, preferably from 170 g / mol to 500 g / mol, more preferably from 200 g / mol to 400 g / mol.

[0120] The alkoxylated fatty alcohol accounts for 0.1 to 20% by weight, preferably 0.1 to 15% by weight, based on the total weight of the lubricant composition (expressed as 100% by weight).

[0121] Alkoxylated fatty alcohols are commercially available products.

[0122] Anti-corrosion system

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

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

[0125] Preferably, the acid of the preservative system used in the present invention is a saturated acid.

[0126] Preferably, the acid of the preservative system used in the present invention consists of carbon, hydrogen and oxygen atoms.

[0127] Preferably, the acid is selected from monobasic acids. Dibasic acids may present staining problems.

[0128] Among the bases, amines (especially alkanolamines and amino alcohols), potassium hydroxide and sodium hydroxide may be mentioned. The base may be selected from 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)), ethyleneamines (such as ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA)), cyclic amines (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 is selected from monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), triethanolamine (TEA), diglycolamine (DGA), isopropanolamines (such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA) and triisopropanolamine (TIPA)), ethyleneamines (such as ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA)), cyclic amines (such as cyclohexylamine), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

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

[0131] 0.05% to 15% by weight (preferably 0.1% to 10% by weight, more preferably 0.5% to 7% by weight) of an acid relative to the total weight of the lubricant composition, and

[0132] 0.05% to 15% by weight (preferably 0.1% to 10% by weight, more preferably 1% to 7% by weight) of a base relative to the total weight of the lubricant composition.

[0133] In a preferred embodiment, the lubricant composition comprises:

[0134] 0.05% to 15% by weight (preferably 0.1% to 10% by weight, more preferably 0.5% to 7% by weight) of an aliphatic carboxylic acid relative to the total weight of the lubricant composition, and

[0135] 0.05% to 15% by weight (preferably 0.1% to 10% by weight, more preferably 1% to 7% by weight) of amine relative to the total weight of the lubricant composition.

[0136] In a preferred embodiment, the lubricant composition comprises:

[0137] 0.05% to 15% by weight (preferably 0.1% to 10% by weight, more preferably 1% to 7% by weight) of an aliphatic monocarboxylic acid relative to the total weight of the lubricant composition, and

[0138] 0.05% to 15% by weight (preferably 0.1% to 10% by weight, more preferably 1% to 7% by weight) of alkanolamine relative to the total weight of the lubricant composition.

[0139] In a preferred embodiment, the lubricant composition comprises:

[0140] 0.05% to 10% by weight (preferably 0.1% to 7% by weight, more preferably 0.5% to 5% by weight) of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, relative to the total weight of the lubricant composition, and

[0141] 0.05 to 10 wt. % (preferably 0.1 to 10 wt. %, more preferably 1 to 10 wt. %) of an alkanolamine, relative to the total weight of the lubricant composition, the alkanolamine being selected from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

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

[0143] 0.05% to 10% by weight (preferably 0.1% to 7% by weight, more preferably 0.5% to 5% by weight) of a saturated aliphatic monocarboxylic acid having 4 to 15 carbon atoms, relative to the total weight of the lubricant composition, and

[0144] 0.05 to 10 wt. % (preferably 0.1 to 10 wt. %, more preferably 1 to 10 wt. %) of an alkanolamine, relative to the total weight of the lubricant composition, the alkanolamine being selected from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0145] In one embodiment, the acid / base weight ratio of the preservative system ranges from 0.1 to 2, preferably from 0.2 to 1, and more preferably from 0.3 to 0.8.

[0146] Preferably, the corrosion protection system is selected to maintain the pH of the lubricant composition at an alkaline pH, ie, a pH in the range of 8 to 11, preferably 8 to 10.

[0147] The acid / base corrosion protection system accounts for 0.1 wt % to 30 wt %, preferably 1 wt % to 30 wt %, based on the total weight of the lubricant composition (expressed as 100 wt %).

[0148] Polyols

[0149] In one embodiment, the lubricant composition of the invention additionally comprises at least one polyol having 2 to 8 carbon atoms and at least 2 hydroxyl functional groups.

[0150] In the present invention, the polyol does not contain ether functional groups.

[0151] The polyol is preferably glycerol.

[0152] In the present invention, glycerol also includes glycerine.

[0153] Therefore, in a particular embodiment, the lubricant composition of the invention additionally comprises glycerol.

[0154] Preferably, the polyol (more preferably glycerol) comprises 0.1 to 15 wt %, preferably 0.5 to 10 wt %, based on the weight of the lubricant composition of the present invention.

[0155] If the composition is a ready-to-use composition, preferably the polyol (more preferably glycerol) comprises 0.1 wt% to 10 wt%, more preferably 0.5 wt% to 5 wt% of the weight of the lubricant composition of the present invention.

[0156] If the composition is concentrated (and therefore to be diluted), preferably the polyol (more preferably glycerol) comprises from 1 wt % to 15 wt %, more preferably from 2 wt % to 10 wt % of the weight of the lubricant composition of the present invention.

[0157] The inventors have found that a polyol, such as glycerol, added to a lubricant composition comprising at least one PAG, at least one fatty alcohol and a corrosion protection system allows to improve the metalworking process by reducing residues and thus reducing adhesion problems that may occur during transportation of metal parts after the metalworking process.

[0158] Lubricant composition

[0159] The lubricant composition of the present invention is an aqueous lubricant composition. Water may account for 10 wt % to 95 wt % of the total weight of the lubricant composition.

[0160] If the composition is a ready-to-use composition, water preferably represents 40% to 95% by weight, preferably 50% to 90% by weight, based on the total weight of the lubricant composition.

[0161] If the composition is a concentrated composition (to be diluted), water preferably represents 10% to 50% by weight, preferably 10% to 30% by weight, based on the total weight of the lubricant composition.

[0162] The lubricant composition of the present invention may further comprise at least one additive selected from additives conventionally used by those skilled in the art in lubricant compositions for metalworking, preferably at least one additive selected from defoamers, biocides, wetting agents, friction modifiers, antifreeze additives, preservatives other than acid-base systems and mixtures thereof.

[0163] In one embodiment, the lubricant composition of the present invention further comprises at least one additive selected from defoamers, benzotriazole or tolyltriazole type preservatives and antimicrobial agents, alone or in mixture, preferably in a total amount in the range of 0.01 wt. % to 5 wt. %, preferably in the range of 0.05 wt. % to 3 wt. %, relative to the total weight of the lubricant composition.

[0164] In one embodiment, the lubricant composition has a viscosity of 1 mm at 40°C. 2 / s to 20mm 2 / s, preferably within 1.5mm 2 / s to 5mm 2 / s range.

[0165] The viscosity of the lubricant composition at 40° C. can be measured according to standard ASTM D7042.

[0166] In one embodiment, the lubricant composition of the present invention comprises water and:

[0167] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms),

[0168] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0169] 0.1% to 30% by weight, preferably 1% to 30% by weight, relative to the total weight of the lubricant composition, of an anticorrosion system comprising at least one acid and at least one base.

[0170] In one embodiment, the lubricant composition of the present invention comprises water and:

[0171] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms),

[0172] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, propoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0173] - 0.1% to 30% by weight (preferably 1% to 30% by weight), relative to the total weight of the lubricant composition, of an anticorrosion system comprising at least one acid and at least one base,

[0174] 0.1% to 15% by weight, preferably 0.5% to 10% by weight, relative to the total weight of the lubricant composition, of a polyol, preferably glycerol.

[0175] In one embodiment, the lubricant composition of the present invention comprises water and:

[0176] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms),

[0177] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0178] 0.5% to 15% by weight (preferably 0.1% to 10% by weight) of an aliphatic carboxylic acid relative to the total weight of the lubricant composition,

[0179] 0.05% to 15% by weight (preferably 0.1% to 12% by weight) of amine relative to the total weight of the lubricant composition.

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

[0181] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms),

[0182] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0183] 0.05% to 15% by weight (preferably 0.1% to 10% by weight) of an aliphatic carboxylic acid composed of carbon, hydrogen and oxygen atoms, relative to the total weight of the lubricant composition,

[0184] 0.05% to 15% by weight (preferably 0.1% to 12% by weight) of amine relative to the total weight of the lubricant composition.

[0185] In one embodiment, the lubricant composition of the present invention comprises water and:

[0186] 1 to 60 wt. % (preferably 5 to 60 wt. %) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms), the molecular weight of the PAG ranging from 1000 to 3000 g / mol,

[0187] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol,

[0188] 0.05% to 15% by weight (preferably 0.1% to 10% by weight) of an aliphatic carboxylic acid relative to the total weight of the lubricant composition,

[0189] 0.05% to 15% by weight (preferably 0.1% to 12% by weight) of amine relative to the total weight of the lubricant composition.

[0190] In one embodiment, the lubricant composition of the present invention comprises water and:

[0191] 1 to 60 wt. % (preferably 5 to 60 wt. %) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms), the molecular weight of the PAG ranging from 1000 to 3000 g / mol,

[0192] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol,

[0193] 0.05% to 15% by weight (preferably 0.1% to 10% by weight) of an aliphatic carboxylic acid relative to the total weight of the lubricant composition,

[0194] - 0.05% to 15% by weight (preferably 0.1% to 12% by weight) of an amine, relative to the total weight of the lubricant composition,

[0195] 0.1% to 15% by weight, preferably 0.5% to 10% by weight, relative to the total weight of the lubricant composition, of a polyol, preferably glycerol.

[0196] In one embodiment, the lubricant composition of the present invention comprises water and:

[0197] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAGs containing alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms), with respect to the total weight of the lubricant composition, said PAGs being terminated by 1 or 2 identical or different alkyl end groups having 1 to 5 carbon atoms,

[0198] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0199] 0.05% to 15% by weight (preferably 0.1% to 10% by weight, more preferably 0.5% to 5% by weight) of an aliphatic carboxylic acid relative to the total weight of the lubricant composition,

[0200] 0.05% to 15% by weight (preferably 0.1% to 12% by weight) of amine relative to the total weight of the lubricant composition.

[0201] In one embodiment, the lubricant composition of the present invention comprises water and:

[0202] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms),

[0203] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0204] 0.05% to 15% by weight (preferably 0.1% to 10% by weight) of an aliphatic monocarboxylic acid, relative to the total weight of the lubricant composition, and

[0205] 0.05% to 15% by weight, preferably 0.1% to 12% by weight, of alkanolamine relative to the total weight of the lubricant composition.

[0206] In one embodiment, the lubricant composition of the present invention comprises water and:

[0207] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms),

[0208] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0209] 0.05% to 15% by weight (preferably 0.1% to 10% by weight) of an aliphatic monocarboxylic acid, relative to the total weight of the lubricant composition, and

[0210] - 0.05% to 15% by weight (preferably 0.1% to 12% by weight) of alkanolamine relative to the total weight of the lubricant composition,

[0211] 0.1% to 15% by weight, preferably 0.5% to 10% by weight, relative to the total weight of the lubricant composition, of a polyol, preferably glycerol.

[0212] In one embodiment, the lubricant composition of the present invention comprises water and:

[0213] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms),

[0214] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0215] 0.05% to 15% by weight (preferably 0.1% to 10% by weight), relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0216] 0.05% to 15% by weight (preferably 0.1% to 12% by weight), relative to the total weight of the lubricant composition, of an alkanolamine chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

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

[0218] 1 to 60 wt. % (preferably 5 to 60 wt. %) of a PAG selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, relative to the total weight of the lubricant composition,

[0219] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0220] 0.05% to 15% by weight (preferably 0.1% to 10% by weight) of an aliphatic monocarboxylic acid, relative to the total weight of the lubricant composition, and

[0221] 0.05% to 15% by weight, preferably 0.1% to 12% by weight, of alkanolamine relative to the total weight of the lubricant composition.

[0222] In one embodiment, the lubricant composition of the present invention comprises water and:

[0223] 1 to 60 wt. % (preferably 5 to 60 wt. %) of a PAG selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, relative to the total weight of the lubricant composition,

[0224] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof,

[0225] 0.05% to 15% by weight (preferably 0.1% to 10% by weight), relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0226] 0.05% to 15% by weight (preferably 0.1% to 12% by weight), relative to the total weight of the lubricant composition, of an alkanolamine chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0227] In one embodiment, the lubricant composition of the present invention comprises water and:

[0228] 1 to 60 wt. % (preferably 5 to 60 wt. %) of PAG, relative to the total weight of the lubricant composition, selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, the molecular weight of the PAG ranging from 1000 to 3000 g / mol,

[0229] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol,

[0230] 0.05% to 15% by weight (preferably 0.1% to 10% by weight), relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0231] 0.05% to 15% by weight (preferably 0.1% to 12% by weight), relative to the total weight of the lubricant composition, of an alkanolamine chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0232] In one embodiment, the lubricant composition of the present invention comprises water and:

[0233] 1 to 60 wt. % (preferably 5 to 60 wt. %) of PAG, relative to the total weight of the lubricant composition, selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, the molecular weight of the PAG ranging from 1000 to 3000 g / mol,

[0234] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol,

[0235] 0.05% to 15% by weight (preferably 0.1% to 10% by weight), relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0236] 0.05% to 15% by weight (preferably 0.1% to 12% by weight), relative to the total weight of the lubricant composition, of an alkanolamine selected from the group consisting of 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

[0237] 0.1% to 15% by weight, preferably 0.5% to 10% by weight, relative to the total weight of the lubricant composition, of a polyol, preferably glycerol.

[0238] If the composition is a ready-to-use composition, in one embodiment, the lubricant composition of the invention comprises water and:

[0239] 1 to 30 wt. % of PAG, relative to the total weight of the lubricant composition, selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, the molecular weight of the PAG ranging from 1000 to 3000 g / mol,

[0240] 0.1% to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol,

[0241] - 0.05% to 10% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0242] 0.05% to 10% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from the group consisting of 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.

[0243] If the composition is a ready-to-use composition, in one embodiment, the lubricant composition of the invention comprises water and:

[0244] 1 to 30 wt. % of PAG, relative to the total weight of the lubricant composition, selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers and mixtures thereof, the molecular weight of the PAG ranging from 1000 to 3000 g / mol,

[0245] 0.1% to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol,

[0246] - 0.05% to 10% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0247] 0.05% to 10% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from the group consisting of 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,

[0248] 0.1% to 15% by weight, preferably 0.5% to 10% by weight, relative to the total weight of the lubricant composition, of a polyol, preferably glycerol.

[0249] In one embodiment, the lubricant composition of the present invention comprises water and:

[0250] - 1% to 60% by weight (preferably 5% to 60% by weight) of PAGs containing alkylene oxide repeating units having 2 to 8 carbon atoms (preferably 2 to 4 carbon atoms), with respect to the total weight of the lubricant composition, said PAGs being terminated by 1 or 2 identical or different alkyl end groups having 1 to 5 carbon atoms,

[0251] 0.1% to 20% by weight, preferably 0.1% to 15% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0252] 0.05% to 15% by weight (preferably 0.1% to 10% by weight), relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0253] 0.05% to 15% by weight (preferably 0.1% to 12% by weight), relative to the total weight of the lubricant composition, of an alkanolamine chosen from monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA), methyldiethanolamine (MDEA), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0254] If the composition is a ready-to-use composition, according to one embodiment, the lubricant composition of the invention comprises water and:

[0255] - 1% to 30% by weight of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, said PAG being terminated by 1 or 2 identical or different alkyl end groups having from 1 to 5 carbon atoms,

[0256] - 0.1% to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0257] - 0.05% to 10% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0258] 0.05% to 10% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from the group consisting of 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.

[0259] If the composition is a ready-to-use composition, according to one embodiment, the lubricant composition of the invention comprises water and:

[0260] - 1% to 30% by weight of PAG, relative to the total weight of the lubricant composition, comprising alkylene oxide repeating units having from 2 to 8 carbon atoms, preferably from 2 to 4 carbon atoms, said PAG being terminated by 1 or 2 identical or different alkyl end groups having from 1 to 5 carbon atoms,

[0261] - 0.1% to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, said fatty alcohol comprising a hydrocarbon chain having from 6 to 24 carbon atoms,

[0262] - 0.05% to 10% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and

[0263] 0.05% to 10% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from the group consisting of 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,

[0264] 0.1% to 15% by weight, preferably 0.5% to 10% by weight, relative to the total weight of the lubricant composition, of a polyol, preferably glycerol.

[0265] Preferably, the lubricant composition of the present invention is in the form of a solution. The ingredients of the lubricant composition are preferably water-soluble or soluble in water.

[0266] In the sense of the present invention, a "solution" is to be distinguished from an emulsion or dispersion which may contain multiple phases or may contain insoluble particles.

[0267] In one embodiment, the aqueous lubricant composition of the present invention is not an emulsion.

[0268] The lubricant composition of the present invention can be prepared by simply mixing the ingredients using any method known to those skilled in the art to obtain a solution.

[0269] application

[0270] The invention also relates to the use of the lubricant composition of the invention as a fluid for metal working, in particular for deforming metal parts and / or for forming metal parts and / or for cutting metal parts and / or for stamping metal parts and / or for rolling metal parts, the metal preferably being selected from steel and aluminium.

[0271] It should be noted that the lubricant composition may be diluted with water prior to use as a fluid in metalworking.

[0272] The invention also relates to a method for lubricating at least one surface of a metal part, in particular aluminium or steel, comprising contacting a lubricant composition with said metal surface.

[0273] Preferably, the contacting step is performed by spraying the lubricant composition or by depositing the lubricant composition onto the metal surface, possibly using a roller or a brush.

[0274] Preferably, the metal surface is a surface of aluminum or steel.

[0275] The metal component preferably has a narrow thickness, for example, a thickness of 5 μm or less, preferably a thickness of 3 μm or less, and more preferably a thickness in the range of 0.35 μm to 1.5 μm.

[0276] It should be noted that the lubrication method may comprise the step of diluting the lubricant composition with water prior to the step of contacting the (diluted) lubricant composition with said metal surface.

[0277] The inventors have observed that the combination of PAG, alkoxylated fatty alcohol and acid / base corrosion protection system allows obtaining lubricant compositions having reduced or even zero VOC emissions even when heated to 80° C., said compositions having excellent lubricating properties for metalworking, in particular for deformation of metals.

[0278] Thus, the lubricant composition of the present invention has versatility in that it can be used for deforming both steel and aluminum.

[0279] In one embodiment, the lubrication method further comprises a heat treatment step for the metal part after the contacting step. For example, the heat treatment may be heated to a temperature of at least 150° C., even at least 200° C., even at least 300° C. This embodiment comprising a heat treatment step is particularly well suited when the metal part is an aluminum part.

[0280] The lubricant composition of the present invention may also be used to provide deformed metal parts without staining the metal parts, particularly when the parts are aluminum.

[0281] The PAG used for the above-mentioned purposes may have one or more of the characteristics and preferences described above in connection with the lubricant composition of the present invention.

[0282] The alkoxylated fatty alcohols used for the above purposes may have one or more of the characteristics and preferences described above in connection with the lubricant composition of the present invention.

[0283] The corrosion protection system for the above-mentioned use may have one or more of the features and preferences described above in connection with the lubricant composition of the present invention.

[0284] The lubricant composition resulting from the above-described use may have one or more of the features and preferences described above in connection with the lubricant composition of the present invention.

[0285] A further subject of the present invention is the use of the lubricant composition according to the invention for increasing the eco-efficiency of a process comprising at least one metalworking step, wherein the eco-efficiency is selected from:

[0286] - reduce the energy consumed in carrying out the method,

[0287] - increasing the productivity of the process,

[0288] - improve the safety of the operator of the method,

[0289] Ecological efficiency is selected in particular from increased safety for the operator of the method.

[0290] By reducing VOC emissions, this ultimately leads to a reduction in energy consumption, thereby participating in mitigating global warming.

[0291] By reducing staining, better productivity can be achieved.

[0292] Furthermore, the use of aqueous solvents improves operator safety compared to organic solvents and eliminates the need for an oven drying step at high temperatures.

[0293] The metal working step may comprise deforming of a metal part and / or forming of a metal part and / or cutting of a metal part and / or stamping of a metal part and / or rolling of a metal part, the metal being preferably selected from steel and aluminium.

[0294] In other words, the lubricant composition of the invention allows reducing the environmental impact of a process comprising at least one metalworking step.

[0295] Example

[0296] In the remainder of the description, examples are given to illustrate the invention without limiting its scope in any way.

[0297] In the examples, the following ingredients were used:

[0298] -PAG1 represents a linear poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeating units, with an EO / PO ratio of about 1:1, PAG1 is terminated with methyl and butyl groups, and the molecular weight of PAG1 ranges from 1000 g / mol to 2000 g / mol.

[0299] -PAG2 represents a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeating units, with an EO / PO ratio of about 1:1, one end of PAG2 is terminated by a butyl group and the other end is terminated by a hydroxyl group, and the molecular weight of PAG2 ranges from 1000 g / mol to 2000 g / mol.

[0300] -PAG3 represents a poly(alkylene glycol) comprising repeating units of ethylene oxide (EO) and propylene oxide (PO), one end of PAG3 is terminated by an alkyl group and the other end is terminated by a hydroxyl group, and the molecular weight of PAG3 ranges from 1000 g / mol to 2500 g / mol.

[0301] -PAG4 represents a poly(alkylene glycol) comprising ethylene oxide (EO) and propylene oxide (PO) repeating units, the EO / PO ratio is about 1:2, PAG4 is terminated with hydroxyl groups, and the molecular weight of PAG4 ranges from 2000 g / mol to 3000 g / mol.

[0302] - Alkoxylated fatty alcohols denote one or more alcohols comprising propoxylated repeating units and / or ethoxylated repeating units and an aliphatic hydrocarbon chain having 12 to 14 carbon atoms,

[0303] -Alkanolamine means one or more alkanolamines selected from the group consisting of 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.

[0304] -C8-C10 aliphatic monocarboxylic acid means one or more aliphatic monocarboxylic acids having 8 to 10 carbon atoms,

[0305] -C8-C10 aliphatic dicarboxylic acid means one or more aliphatic dicarboxylic acids having 8 to 10 carbon atoms,

[0306] - salts derived from triazines are systems comprising fatty tribasic acid salts derived from 1,3,5-triazine,

[0307] - Glycerol 99.5%,

[0308] The additive package denotes a mixture of additives commonly used in lubricant compositions for metalworking, including in particular defoamers and corrosion inhibitors of the benzotriazole type.

[0309] Example 1: Measurement of VOC emissions

[0310] In this example, the lubricant composition of the present invention was compared with two organic solvent-based lubricant compositions for deformation of metal parts.

[0311] Table 1 gives the details of the test compositions, the percentages are by weight relative to the total weight of the composition.

[0312] Table 1

[0313] CC1 CC2 CI1 Mineral oil of petroleum origin 76％ ester 24％ 24％ Isoparaffinic oils of petroleum origin 76％ water 70.74％ PAG1 10％ PAG2 10％ Alkoxylated fatty alcohol 1％ Alkanolamines 4.6％ C7-C11 aliphatic monobasic acid 3％ Additive Package 0.66％

[0314] The test was carried out according to standard EN NF 12619, 3 grams of product were weighed, and two temperatures were tested: 30°C and 80°C.

[0315] Table 2 gives the total VOC emissions (converted to ppm) for the three test compositions and the two test temperatures.

[0316] Table 2

[0317] CC1 CC2 CI1 VOC emissions at 30°C 19 216 0 VOC emissions at 80°C 441 2404 0

[0318] The results in Table 2 show that the lubricant composition of the present invention exhibits zero VOC emissions even at 80°C.

[0319] Example 2: Aluminum plate dyeing test

[0320] In this example, a stain test was conducted to determine any staining of the aluminum parts by the lubricant composition.

[0321] Table 3 gives the details of the lubricant compositions tested in this example.

[0322] Table 3

[0323] CC3 CI2 CI3 CI4 water 72.95％ 70.45％ 70.45％ 71.45％ PAG1 5％ 5％ 2％ PAG2 15％ 15％ 6％ PAG3 20％ PAG4 8％ Alkoxylated fatty alcohol 1％ 1％ 1％ castor oil 5％ Salts derived from triazines 1.5％ Alkanolamines 4.6％ 4.6％ 4.6％ C7-C11 aliphatic monobasic acid 3％ 3％ C7-C11 aliphatic dibasic acid 3％ glycerin 3％ Additive Package 0.55 0.95％ 0.95％ 0.95％

[0324] The staining was evaluated by spraying the lubricant composition onto an aluminum sheet and placing the sheet in an oven heated to 350° C. and then leaving the sheet at 350° C. for 10 minutes. The degree of staining was evaluated by assigning a score from 0 (no staining) to 5 (severe staining).

[0325] Composition CI1 described in Table 1 and the composition in Table 3 were evaluated and the results are shown in Table 4.

[0326] Table 4

[0327] CC3 CI1 CI2 CI3 CI4 Staining score 5 0 0 3 0

[0328] As shown in the results in Table 4, the compositions of the present invention stained less than composition CC3. In addition, compositions CI1, CI2, and CI4 containing monoacids stained less than composition CI3 without monoacids.

[0329] Furthermore, composition CI4 shows a reduction in residues, thereby reducing possible sticking problems in devices used to transport metal parts through metalworking processes.

Claims

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

2. The lubricant composition according to claim 1, comprising water and: - 1% to 60% by weight, relative to the total weight of the lubricant composition, of a polyalkylene glycol comprising repeating alkylene oxide units having from 2 to 8 carbon atoms, - 0.1% to 20% by weight of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition, 0.1 to 30% by weight, relative to the total weight of the lubricant composition, of an anticorrosion system comprising at least one monocarboxylic acid and at least one amine.

3. The lubricant composition according to claim 1 or 2, further comprising at least one polyol, preferably glycerol; preferably, relative to the total weight of the lubricant composition, the polyol, preferably the glycerol is used in the following proportion range: 0.1 wt % to 15 wt %, preferably 0.5 wt % to 10 wt %.

4. The lubricant composition according to any one of claims 1 to 3, which is a ready-to-use composition comprising water and: - 1% to 30% by weight of polyalkylene glycol, relative to the total weight of the lubricant composition, - 0.1% to 10% by weight of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition, - 0.1% to 15% by weight of said anti-corrosion system relative to the total weight of said lubricant composition.

5. The lubricant composition according to any one of claims 1 to 3, which is a concentrated composition comprising water and: - 30% to 60% by weight of polyalkylene glycols relative to the total weight of the lubricant composition, - 1 to 15% by weight of ethoxylated and / or propoxylated fatty alcohols, relative to the total weight of the lubricant composition, - 10% to 30% by weight of said anti-corrosion system relative to the total weight of said lubricant composition.

6. The lubricant composition according to any one of claims 1 to 5, wherein The at least one base is selected from alkanolamines, preferably from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

7. The lubricant composition according to any one of claims 1 to 6, wherein The polyalkylene glycol is selected from polyethylene glycol, polypropylene glycol, a block copolymer comprising ethylene oxide repeating units and propylene oxide repeating units, and a mixture thereof. Preferably, the polyalkylene glycol is selected from a block copolymer comprising ethylene oxide repeating units and propylene oxide repeating units, and a mixture thereof. More preferably, the polyalkylene glycol is selected from a diblock ethylene oxide-propylene oxide copolymer and a triblock propylene oxide-ethylene oxide-propylene oxide copolymer, and a mixture thereof.

8. The lubricant composition according to any one of claims 1 to 7, wherein The molecular weight of each polyalkylene glycol ranges from 500 g / mol to 10000 g / mol, preferably from 800 g / mol to 5000 g / mol, and more preferably from 1000 g / mol to 3000 g / mol.

9. The lubricant composition according to any one of claims 1 to 8, wherein The viscosity of each polyalkylene glycol at 40°C is 10 mm 2 / s to 1000mm 2 / s, preferably within 15mm 2 / s to 500mm 2 / s, more preferably within 20 mm 2 / s to 400mm 2 / s range.

10. The lubricant composition according to any one of claims 1 to 9, wherein The alkoxylated fatty alcohol is selected from the group consisting of ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols, and mixtures thereof.

11. The lubricant composition according to any one of claims 1 to 10, wherein Each alkoxylated fatty alcohol contains from 1 to 20 alkoxylated repeating units and / or a hydrocarbon chain having from 6 to 24 carbon atoms.

12. A lubricant composition according to any one of claims 1 to 4 and 6 to 11, which is a ready-to-use composition comprising water and: - 5 to 30 wt% of PAG, relative to the total weight of the lubricant composition, the PAG being selected from diblock ethylene oxide-propylene oxide copolymers and triblock propylene oxide-ethylene oxide-propylene oxide copolymers, the molecular weight of the PAG being in the range of 1000 to 3000 g / mol, 0.1% to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 g / mol to 900 g / mol, - 0.05% to 10% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and 0.05% to 10% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

13. The lubricant composition according to any one of claims 1 to 3 and 5 to 11, which is a concentrated composition comprising water and: - 30% to 60% by weight of PAG, relative to the total weight of the lubricant composition, the PAG being selected from diblock ethylene oxide-propylene oxide copolymers, triblock propylene oxide-ethylene oxide copolymers -propylene oxide copolymers and mixtures thereof, wherein the molecular weight of the PAG is in the range of 1000 g / mol to 3000 g / mol, - 1 to 10% by weight, relative to the total weight of the lubricant composition, of an alkoxylated fatty alcohol chosen from ethoxylated fatty alcohols, ethoxylated and propoxylated fatty alcohols and mixtures thereof, the molar mass of the alkoxylated fatty alcohol ranging from 100 to 900 g / mol, - 5% to 15% by weight, relative to the total weight of the lubricant composition, of an aliphatic monocarboxylic acid having 4 to 15 carbon atoms, and - 5% to 15% by weight of an alkanolamine, relative to the total weight of the lubricant composition, selected from monoethanolamine, diethanolamine, triethanolamine, diglycolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

14. The lubricant composition according to any one of claims 1 to 13, characterized in that According to standard NF EN12619, its total emission of volatile organic compounds at 80° C. is lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm.

15. Use of the lubricant composition according to any one of claims 1 to 14 as a fluid for metal processing, in particular for metal deformation and / or for metal forming and / or for metal cutting and / or for metal stamping and / or for metal rolling, the metal preferably being selected from steel and aluminum.

16. The use according to claim 15, wherein According to standard NF EN 12619, the total emission of volatile organic compounds at 80° C. is lower than 200 ppm, preferably lower than 150 ppm, more preferably lower than 100 ppm, even lower than 50 ppm.

17. Use of a lubricant composition according to any one of claims 1 to 14 for improving the eco-efficiency of a process comprising at least one metal working step, wherein Eco-efficiency is selected from: - reduce the energy consumed in carrying out the method, - increasing the productivity of the process, - improve the safety of the operator of the method, The safety of the operator of the method is preferably increased.