Water-based lubricant for metal processing

Abstract

The invention relates to a lubricating composition comprising water and, relative to the total weight of the lubricating composition:-1% to 60% by weight of a poly (alkylene glycol),-0.5% to 30% by weight of a polyetheramine. The invention also relates to the use of said lubricating composition as a metal working fluid, preferably selected from steel and aluminum.

Description

Technical Field

[0001] The present invention relates to an aqueous lubricant for metalworking, more particularly for machining (turning, milling, drilling, sawing, threading, etc.), forming, cutting, stamping or rolling metal parts, especially parts of aluminum or steel. Background Art

[0002] Lubricants are traditionally used in metalworking. There are water-based lubricants and non-aqueous lubricants, which are also called organic lubricants.

[0003] Water-based formulations currently on the market are usually in the form of emulsions and often do not meet all expectations for machining metal parts, especially aluminum parts, from the perspective of part quality, performance (speed, feed), tool life. Testing conducted on products primarily for steel may have limitations for aluminum, a softer material that requires specific additives.

[0004] There are aqueous liquids that include poly(alkylene glycols). Generally, this does not meet all of the manufacturers' expectations for use on both steel and aluminum.

[0005] Documents CN108977264, CN108998187, WO2021 / 250210 and US5744432 disclose aqueous liquids for metal processing. The above documents do not disclose the aqueous lubricating composition according to the present invention.

[0006] The present invention provides a lubricating composition with improved lubricating properties for machining metal parts, in particular aluminum and steel, and for forming, cutting, punching or rolling metal parts. Summary of the invention

[0007] The present invention relates to a lubricating composition comprising water and, relative to the total weight of the lubricating composition:

[0008] - 1 to 60% by weight of a poly(alkylene glycol) chosen from block copolymers comprising ethylene oxide units and propylene oxide units,

[0009] - 0.5 to 30% by weight of polyetheramine.

[0010] According to one embodiment, the lubricating composition according to the invention comprises water and, relative to the total weight of the lubricating composition:

[0011] - 5 to 50% by weight of a poly(alkylene glycol) comprising alkylene oxide units containing 2 to 16 carbon atoms, preferably 2 to 8 carbon atoms, the poly(alkylene glycol) being chosen from block copolymers comprising ethylene oxide units and propylene oxide units,

[0012] 1 to 20% by weight of a polyetheramine chosen from monoamines, diamines and triamines comprising units chosen from alkylene oxides containing 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms.

[0013] According to one embodiment, the lubricating composition according to the invention further comprises at least one additive selected from alkaline bases, alkanolamines and mixtures thereof,

[0014] The alkanolamine is preferably 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, and

[0015] The alkaline base is preferably selected from potassium hydroxide and sodium hydroxide.

[0016] Preferably, the poly(alkylene glycol) or poly(alkylene glycol) is chosen from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, preferably from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, more preferably from ethylene oxide-propylene oxide diblock copolymers, propylene oxide-ethylene oxide-propylene oxide triblock copolymers or ethylene oxide-propylene oxide-ethylene oxide triblock copolymers and mixtures thereof.

[0017] According to one embodiment, the molecular weight of each poly(alkylene glycol) is 500 to 10000 g / mol, preferably 800 to 5000 g / mol, more preferably 1100 to 3000 g / mol.

[0018] According to one embodiment, each poly(alkylene glycol) has a viscosity of 10 mm at 40°C. 2 / s to 1000mm 2 / s, preferably 15mm 2 / s to 500mm 2 / s, more preferably 20 mm 2 / s to 400mm 2 / s.

[0019] According to one embodiment, the one or more polyetheramines are selected from monoamines comprising ethylene oxide units and / or propylene oxide units, diamines comprising ethylene oxide units and / or propylene oxide units, and mixtures thereof, preferably from diamines comprising ethylene oxide units and / or propylene oxide units.

[0020] According to one embodiment, the molecular weight of each polyetheramine is 500 g / mol to 5000 g / mol, preferably 1000 g / mol to 3000 g / mol.

[0021] The invention also relates to the use of the lubricating composition according to the invention as a liquid for metalworking, the metal preferably being selected from steel and aluminium.

[0022] Preferably, the composition is used for metal working and / or forming and / or cutting and / or punching and / or rolling metal.

[0023] The present invention also relates to the use of 0.5% to 30% by weight of a polyetheramine in a lubricating composition comprising water and 1% to 60% by weight of a poly(alkylene glycol), relative to the total weight of the lubricating composition, to improve the lubrication properties during metalworking with the lubricating composition.

[0024] Preferably, the lubricating composition is as defined in the present invention.

[0025] According to one embodiment, 0.5 to 30 wt. % of polyetheramine is used to improve the lubricating properties of the lubricating composition during processing and / or forming and / or cutting and / or punching and / or rolling of metal.

[0026] The present invention can provide a multi-purpose lubricating composition in that it can be applied equally well to aluminum surfaces or steel surfaces.

[0027] The present invention can provide a lubricating composition having good toxicological properties and low impact on the environment.

[0028] The present invention can provide a lubricating composition that does not produce oil deposits on the ground, which increases operator safety.

[0029] The lubricating composition according to the invention has improved lubricating properties both on aluminium and on steel. DETAILED DESCRIPTION

[0030] The present invention relates to a lubricating composition comprising water and, relative to the total weight of the lubricating composition:

[0031] - 1 to 60% by weight, preferably 5 to 50% by weight, more preferably 10 to 40% by weight, of polyalkylene glycols chosen from block copolymers comprising ethylene oxide units and propylene oxide units,

[0032] 0.5 to 30 wt %, preferably 1 to 20 wt %, more preferably 2 to 15 wt % of a polyetheramine, wherein the lubricating composition may be in the form of a solution or an emulsion, preferably in the form of a solution.

[0033] Polyalkylene glycol (PAG)

[0034] According to the present invention, the one or more PAGs of the lubricating composition of the present invention are selected from one or more PAGs comprising ethylene oxide units and propylene oxide units.

[0035] According to one embodiment, the one or more PAGs used in the lubricating composition according to the invention correspond to formula (I):

[0036] R-(OA) Z OH(I)

[0037] in:

[0038] R represents a hydrogen atom or a straight or branched chain alkyl group containing 1 to 5 carbon atoms;

[0039] A (all identical or different) represents a straight or branched chain alkyl group comprising 2 to 16 carbon atoms, preferably 2 to 8 carbon atoms, more preferably 2 to 4 carbon atoms, even 2 to 3 carbon atoms;

[0040] z represents an integer greater than or equal to 2, preferably an integer greater than or equal to 4,

[0041] It is understood that at least one radical A is a vinyl group and at least one radical A is a propenyl group.

[0042] According to one embodiment, the one or more PAGs of the lubricating composition according to the invention are chosen from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, preferably from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, more preferably from ethylene oxide-propylene oxide diblock copolymers, propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof.

[0043] More specifically, when the PAG is selected from block copolymers comprising ethylene oxide units and propylene oxide units, the lubricating composition exhibits better performance in metal processing.

[0044] As defined in the present invention, "block copolymers comprising ethylene oxide units and propylene oxide units" 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. Therefore, the copolymer may also be referred to as PEG / PPG.

[0045] As defined in the present invention, "ethylene oxide-propylene oxide diblock copolymer" refers to a copolymer consisting of two blocks, one block derived from the polymerization of ethylene glycol and the other block derived from the polymerization of propylene glycol. Therefore, the copolymer can also be called PEG-PPG.

[0046] As defined in the present invention, "propylene oxide-ethylene oxide-propylene oxide triblock copolymer" refers to a copolymer consisting of a sequence of three blocks, 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). Therefore, the copolymer can also be called PPG-PEG-PPG.

[0047] If applicable, the one or more PAGs used in the present invention may include alkyl end groups, for example selected from linear or branched alkyl groups containing 1 to 5 carbon atoms. Preferably, the one or more PAGs used in the present invention do not include such alkyl end groups.

[0048] According to one embodiment, the lubricating composition comprises at least one PAG comprising -OCH2CH2- units and -OCH2CH(CH3)- units such that the weight ratio between the OCH2CH2 units and the OCH2CH(CH3) units is from 0.1 to 0.9, preferably from 0.2 to 0.7, more preferably from 0.25 to 0.5.

[0049] According to one embodiment, the one or more PAGs used in the lubricating composition according to the invention correspond to one of formulae (II) to (V):

[0050] R-(OCH2CH2) x (OCH2CH(CH3)) y OH(II);

[0051] R-(OCH2CH(CH3)) y (OCH2CH2) x OH(III);

[0052] R-(OCH2CH(CH3)) y (OCH2CH2) x (OCH2CH(CH3)) y’ OH(IV);

[0053] R-(OCH2CH2) x (OCH2CH(CH3)) y (OCH2CH2) x’ OH(V);

[0054] in:

[0055] R represents a hydrogen atom or a straight-chain or branched saturated alkyl group containing 1 to 5 carbon atoms;

[0056] x and x' are the same or different and represent an integer greater than or equal to 2, preferably greater than or equal to 4; y and y' are the same or different and represent an integer greater than or equal to 2.

[0057] Preferably, in the compounds of formula (II), (III), (IV) or (V) according to the invention, x, x', y and y' are independently of one another integers from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20.

[0058] Preferably, in formula (IV), x is an integer from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20, and the sum of y+y′ is from 8 to 45, preferably from 12 to 40, more preferably from 20 to 35.

[0059] Preferably, in formula (V), y is an integer from 2 to 30, preferably from 4 to 25, advantageously from 6 to 20, and the sum of x+x′ is from 8 to 45, preferably from 12 to 40, more preferably from 20 to 35.

[0060] Preferably, in the compounds of formula (II), (III), (IV) or (V) that enter into the PAG of the lubricating composition according to the invention, R is a hydrogen atom.

[0061] According to one embodiment, each PAG entering the lubricating composition according to the invention corresponds to formula (IV) wherein R is a hydrogen atom, wherein x, y and y′ are each independently selected from integers ranging from 6 to 20, and the sum of y+y′ is 20 to 35.

[0062] According to one embodiment, the molecular weight of each PAG entering the lubricating composition according to the invention is 500 to 10000 g / mol, preferably 800 to 5000 g / mol, more preferably 1100 to 3000 g / mol.

[0063] According to one embodiment, each PAG entering the lubricating composition according to the invention has a viscosity of 10 mm at 40°C. 2 / s to 1000mm 2 / s, preferably 15mm 2 / s to 500mm 2 / s, more preferably 20 mm 2 / s to 400mm 2 / s.

[0064] The viscosity at 40° C. can be measured according to standard ASTM D7042.

[0065] According to one embodiment, the pour point of each PAG entering the lubricating composition according to the invention is less than 0°C, preferably less than -15°C, more preferably less than -20°C.

[0066] The pour point can be measured according to standard ISO 3016.

[0067] The one or more PAGs account for 1 wt % to 60 wt %, preferably 5 wt % to 50 wt %, more preferably 10 wt % to 40 wt % of the total weight (100 wt %) of the lubricating composition.

[0068] PAG is a commercially available product.

[0069] Polyetheramine (PEA)

[0070] According to one embodiment, the PEA or PEAs used in the lubricating composition according to the invention are chosen from monoamines, diamines and triamines comprising one or more units chosen from alkylene oxides comprising 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms.

[0071] In the context of the present invention, the one or more PEAs that go into the lubricating composition are different from the PAGs that go into the lubricating composition.

[0072] According to one embodiment, the one or more PEAs used in the lubricating composition according to the invention are chosen from monoamines comprising ethylene oxide units and / or propylene oxide units, diamines comprising ethylene oxide units and / or propylene oxide units and mixtures thereof, preferably from diamines comprising ethylene oxide units and / or propylene oxide units.

[0073] As defined herein, "monoamine comprising ethylene oxide units and / or propylene oxide units" refers to a compound comprising a monoamine functional group, which comprises (i) polymerized blocks derived from ethylene glycol and / or (ii) polymerized blocks derived from propylene glycol.

[0074] "Diamine comprising ethylene oxide units and / or propylene oxide units" refers to a compound comprising exactly two amine functional groups, the compound comprising (i) polymerized blocks derived from ethylene glycol and / or (ii) polymerized blocks derived from propylene glycol.

[0075] Preferably, the one or more PEAs entering the lubricating composition according to the invention are selected from primary amines.

[0076] According to a particular embodiment, the PEA or PEAs used in the lubricating composition according to the invention are chosen from diamines comprising ethylene oxide units and propylene oxide units.

[0077] "Diamine comprising ethylene oxide units and / or propylene oxide units" as defined in the present invention refers to a compound comprising exactly two amine functional groups, the compound comprising (i) a polymerized block derived from ethylene glycol and (ii) a polymerized block derived from propylene glycol.

[0078] According to one embodiment, the one or more PEAs used in the lubricating composition according to the invention correspond to formula (VI), (VIa), (VII), (VIIa), (VIII), (VIIIa), (IX) and / or (X):

[0079] H3C-(OCH2CH2) r (OCH2CH(CH3)) s -NH2(VI)

[0080] H3C-(OCH2CH(CH3)) s -(OCH2CH2) r -NH2(VIa)

[0081] H2N-CH(CH3)-CH2-(OCH2CH(CH3)) t -NH2(VII)

[0082] H2N-CH(CH3)-CH2-(OCH2CH2) r -NH2(VIIa)

[0083] H2N-CH(CH3)-CH2-(OCH2CH(CH3)) u (OCH2CH2) v (OCH2CH(CH3)) w -NH2(VIII)

[0084] H2N-CH(CH3)-CH2-(OCH2CH2) u (OCH2CH(CH3)) v (OCH2CH2) w -NH2(VIIIa)

[0085] H3C-(OCH2CH2) r -NH2(IX)

[0086] H3C-(OCH2CH(CH3)) t -NH2(X)

[0087] in:

[0088] R represents an integer greater than or equal to 2, preferably greater than or equal to 5, more preferably greater than or equal to 8;

[0089] s represents an integer greater than or equal to 2, preferably greater than or equal to 5, more preferably greater than or equal to 8;

[0090] t represents an integer greater than or equal to 6, preferably greater than or equal to 10, more preferably greater than or equal to 15;

[0091] u represents an integer greater than or equal to 2, preferably greater than or equal to 5, more preferably greater than or equal to 8;

[0092] v represents an integer greater than or equal to 2, preferably greater than or equal to 5, more preferably greater than or equal to 8;

[0093] w represents an integer greater than or equal to 2, preferably greater than or equal to 5, more preferably greater than or equal to 8;

[0094] The premise is:

[0095] In formula (VI) and (VIa), r+s is greater than or equal to 6, preferably greater than or equal to 10, more preferably greater than or equal to 15, and:

[0096] In formulae (VIII) and (VIIIa), u+v+w is greater than or equal to 6, preferably greater than or equal to 10, and more preferably greater than or equal to 15.

[0097] The PEA used in the lubricating composition according to the present invention may comprise a mixture of PEAs, in particular a mixture of PEAs of formula (VI), (VIa), (VII), (VIIa), (VIII), (VIIIa), (IX) and / or (X).

[0098] According to one embodiment, the lubricating composition according to the invention comprises at least one PEA corresponding to one of formulae (VI), (VII) or (VIII).

[0099] According to one embodiment, the PEA or PEAs entering the lubricating composition according to the invention comprise at least 50% by weight of PEAs corresponding to formula (VI), (VII) and / or (VIII), relative to the total weight of PEAs.

[0100] According to one embodiment, the one or more PEAs entering the lubricating composition according to the invention comprise at least 50% by weight, preferably at least 70% by weight, preferably at least 90% by weight of PEA corresponding to formula (VII), preferably wherein t is an integer from 6 to 70, preferably from 10 to 60, more preferably from 15 to 50, relative to the total weight of the PEAs.

[0101] According to one embodiment, the one or more PEAs entering the lubricating composition according to the invention comprise at least 50% by weight, preferably at least 70% by weight, preferably at least 90% by weight of PEA corresponding to formula (VI), preferably wherein r and s have a molecular weight of 1000 to 3000 g / mol, relative to the total weight of the PEAs.

[0102] According to one embodiment, the one or more PEAs entering the lubricating composition according to the invention correspond to formula (VII), preferably wherein t is an integer from 6 to 70, preferably from 10 to 60, more preferably from 15 to 50.

[0103] According to one embodiment, the PEA or PEAs entering the lubricating composition according to the invention correspond to formula (VI), preferably wherein r and s have a molecular weight of from 1000 g / mol to 3000 g / mol.

[0104] According to one embodiment, the molecular weight of the PEA(s) entering the lubricating composition according to the invention is between 500 g / mol and 5000 g / mol, preferably between 1000 g / mol and 3000 g / mol.

[0105] PEA or PAG accounts for 0.5 wt % to 30 wt %, preferably 1 wt % to 20 wt %, more preferably 2 wt % to 15 wt % of the total weight (100 wt %) of the lubricating composition.

[0106] PEA is a commercially available product.

[0107] Lubricating composition

[0108] The lubricating composition according to the present invention is an aqueous lubricating composition. Water may account for 10 wt % to 90 wt % of the total weight of the lubricating composition, or 20 wt % to 60 wt % of the total weight of the lubricating composition.

[0109] The lubricating composition may be in the form of a solution or an emulsion.

[0110] If the composition is in the form of an emulsion, for metalworking purposes it will generally be an oil-in-water emulsion wherein the oil may be selected from mineral oils, vegetable oils and animal oils.

[0111] According to the embodiment in which the lubricating composition is in the form of an emulsion, the oil portion of the emulsion generally constitutes from 1 wt % to 60 wt %, preferably from 5 wt % to 40 wt % of the weight of the lubricating composition.

[0112] According to a preferred embodiment, the lubricating composition according to the invention is in the form of a solution. In fact, the ingredients of the lubricating composition are preferably chosen so that they are soluble or dissolve in water.

[0113] A "solution" as defined herein comprises only one phase, as distinct from an emulsion which may comprise multiple phases, and from a dispersion which may comprise undissolved particles.

[0114] Therefore, according to a preferred embodiment, the aqueous lubricating composition according to the invention is not in the form of an emulsion.

[0115] The lubricating composition according to the present invention may further comprise at least one additive selected from the additives conventionally used by those skilled in the art in lubricating compositions for metalworking, preferably at least one additive selected from pH regulators, preservatives, defoamers, biocides, wetting agents, friction modifiers, antifreeze additives, preferably defoamers and biocides, alone or as a mixture.

[0116] According to one embodiment, the lubricating composition according to the invention also comprises at least one pH regulator additive, more particularly an alkaline buffer. The pH regulator is used to maintain the desired pH of the lubricating composition, more particularly to maintain an alkaline pH, advantageously comprised between 8 and 11, in order to prevent in particular corrosion of metal surfaces.

[0117] The pH adjusting agent may be selected from the family of amines, more particularly from the family of alkanolamines and aminoalcohols, or from the family of alkaline bases.

[0118] The pH adjuster additive can especially be a pH adjuster additive selected from the following items: ethanolamines such as monoethanolamine (MEA), diethanolamine (DEA); triethanolamine (TEA), diglycolamine (DGA), isopropanolamines such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA) and triisopropanolamine (TIPA), ethyleneamine, ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA), alkanolamines such as methyldiethanolamine (MDEA), cyclic amines such as cyclohexylamine, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol and mixtures thereof.

[0119] According to one embodiment, the lubricating composition further comprises at least one additive selected from the group consisting of alkaline bases, alkanolamines and mixtures thereof,

[0120] The alkanolamine is preferably 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, and

[0121] The alkaline base is preferably selected from potassium hydroxide and sodium hydroxide.

[0122] According to one embodiment, the lubricating composition comprises 1 to 50 wt. %, preferably 10 to 40 wt. % of a pH adjuster additive, relative to the total weight of the lubricating composition, the pH adjuster additive preferably being chosen from amines, preferably from alkanolamines, such as 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.

[0123] According to one embodiment, the lubricating composition comprises at least one corrosion inhibitor, preferably at least one organic corrosion inhibitor.

[0124] Organic corrosion inhibitors include more particularly aliphatic monocarboxylic acids having 4 to 15 carbon atoms, such as octanoic acid, aliphatic dicarboxylic acids having 4 to 15 carbon atoms, such as sebacic acid (sebacic acid), undecanedioic acid, dodecanedioic acid, isononanoic acid or mixtures thereof, if applicable, polycarboxylic acids neutralized with triethanolamine, such as 1,3,5-triazine-2,4,6-tris(6-aminohexanoic acid), alkanoylaminocarboxylic acids, more particularly isononanoylaminodihexanoic acid, 6-[(4-methylphenyl)sulfonyl]amino]hexanoic acid and mixtures thereof. Boric acid amides, products of the reaction of amines or amino alcohols with boric acid, can also be used.

[0125] The lubricating composition according to the invention may in particular comprise from 0.01% to 15% by weight, preferably from 1.0% to 13% by weight, of corrosion inhibitor relative to the total weight of the composition.

[0126] According to one embodiment, the weight ratio between the proportion of PAG and the proportion of PEA (PAG / PEA) is greater than or equal to 1, preferably greater than or equal to 2.

[0127] According to one embodiment, the lubricating composition according to the invention comprises water and, relative to the total weight of the lubricating composition:

[0128] 1 to 60% by weight, preferably 5 to 50% by weight, more preferably 10 to 40% by weight, of PAG comprising alkylene oxide units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0129] 0.5 to 30% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, of a PEA chosen from monoamines, diamines and triamines comprising units chosen from alkylene oxides having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms.

[0130] According to one embodiment, the lubricating composition according to the invention comprises water and, relative to the total weight of the lubricating composition:

[0131] 1 to 60% by weight, preferably 5 to 50% by weight, more preferably 10 to 40% by weight, of PAG comprising alkylene oxide units having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0132] 0.5 to 30% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, of PEA chosen from monoamines, diamines and triamines comprising units chosen from alkylene oxides having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms,

[0133] % to 50% by weight, preferably 10 to 40% by weight, more preferably 15 to 35% by weight, of an amine other than PEA, wherein the amine may be an alkanolamine, for example 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.

[0134] According to one embodiment, the lubricating composition according to the invention comprises water and, relative to the total weight of the lubricating composition:

[0135] - 1 to 60 wt. %, preferably 5 to 50 wt. %, more preferably 10 to 40 wt. % of a PAG selected from ethylene oxide-propylene oxide diblock copolymers, propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof,

[0136] - 0.5 to 30% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, of PEA chosen from diamines comprising ethylene oxide units and / or propylene oxide units,

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

[0138] - 1 to 60 wt. %, preferably 5 to 50 wt. %, more preferably 10 to 40 wt. % of a PAG selected from ethylene oxide-propylene oxide diblock copolymers, propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof,

[0139] - 0.5 to 30% by weight, preferably 1 to 20% by weight, more preferably 2 to 15% by weight, of PEA chosen from diamines comprising ethylene oxide units and / or propylene oxide units,

[0140] % to 50% by weight, preferably 10 to 40% by weight, more preferably 15 to 35% by weight, of an amine other than PEA, wherein the amine may be an alkanolamine, for example 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.

[0141] According to one embodiment, the lubricating composition according to the invention comprises water and, relative to the total weight of the lubricating composition:

[0142] 1% to 60% by weight, preferably 5% to 50% by weight, more preferably 10% to 40% by weight of a PAG corresponding to formula (IIa):

[0143] H-(OCH2CH2) xx (OCH2CH(CH3)) yy OH(IIa);

[0144] in:

[0145] xx and yy are integers greater than or equal to 0, such that the molecular weight of the PAG is from 1000 g / mol to 3000 g / mol;

[0146] 0.5 to 30 wt. %, preferably 1 to 20 wt. %, more preferably 2 to 15 wt. % of PEA corresponding to formula (IV) or (VI) as described above, wherein the integers r, s and t are such that the molecular weight of the PEA is from 1000 to 3000 g / mol.

[0147] According to one embodiment, the lubricating composition according to the invention comprises water and, relative to the total weight of the lubricating composition:

[0148] 1% to 60% by weight, preferably 5% to 50% by weight, more preferably 10% to 40% by weight of a PAG corresponding to formula (IVa):

[0149] H-(OCH2CH(CH3)) yy (OCH2CH2) xx (OCH2CH(CH3)) yy’OH(IVa));

[0150] in:

[0151] xx, yy and yy' are integers from 6 to 20,

[0152] The sum of yy+yy' is between 20 and 35.

[0153] xx, yy and yy' are such that the molecular weight of the PAG is from 1000 g / mol to 3000 g / mol and the weight ratio between the OCH2CH2 units and the OCH2CH(CH3) units is from 0.2 to 0.7;

[0154] 0.5 to 30 wt. %, preferably 1 to 20 wt. %, more preferably 2 to 15 wt. % of PEA corresponding to formula (VI) or (VII) as described above, wherein the integers r, s and t are such that the molecular weight of the PEA is from 1000 to 3000 g / mol.

[0155] Preferably, the aqueous lubricating composition is substantially free of metal particles, more particularly free of metal particles that are insoluble at ambient temperature.

[0156] The lubricating composition according to the invention can be prepared by simply mixing the ingredients to obtain a solution according to any method known to a person skilled in the art. If the composition comprises a microbicide and / or a defoamer, the microbicide and the defoamer are preferably added at the end of the preparation of the composition.

[0157] application

[0158] The invention also relates to the use of the lubricating composition according to the invention as a metalworking liquid, more particularly for machining of metals (including in particular turning, milling, drilling, sawing or threading), forming of metals, cutting of metals, stamping of metals or rolling of metals, the metals preferably being selected from steel and aluminium.

[0159] The lubricating composition optionally may be diluted prior to use, particularly when used in metalworking.

[0160] The lubricating composition according to the invention is particularly suitable for machining metals, more particularly for turning, milling, drilling, sawing and / or threading.

[0161] The invention also relates to a method for lubricating a metal surface for machining a surface, in particular aluminium or steel, comprising contacting the lubricating composition according to the invention with the metal surface, in particular aluminium or steel, for example by depositing the lubricating composition on the metal surface.

[0162] According to one embodiment, the lubrication method according to the invention further comprises a step of machining and / or shaping and / or cutting and / or stamping and / or rolling the metal (coated with the lubricating composition), machining in particular comprising turning, milling, drilling, sawing or threading. Preferably, the additional step is a metal machining step, more particularly turning, milling, drilling, sawing and / or threading.

[0163] In fact, the inventors have observed that the combination of PAG and PEA makes it possible to obtain lubricating compositions having excellent lubrication properties for metalworking, more particularly for steel and aluminium.

[0164] Therefore, the lubricating composition according to the present invention has universality since it can be used for machining both steel and aluminum.

[0165] The lubricating composition according to the invention therefore has an excellent service life and a very high duty cycle, in particular higher than the mineral oil-containing fluids of the prior art.

[0166] Another subject of the invention is the use of 0.5% to 30% by weight of a polyetheramine (PEA) in a lubricating composition comprising water and 1% to 60% by weight of a polyalkylene glycol (PAG), relative to the total weight of the lubricating composition, to improve the lubrication properties of metal surfaces, such as aluminum or steel surfaces. More particularly, the use of PEA in a solution comprising water and PAG reduces the power generated during metalworking.

[0167] The one or more PEAs used in the above uses may have one or more of the characteristics and preferences described above in the context of the lubricating composition according to the invention.

[0168] The PAG or PAGs used in the above uses may have one or more of the characteristics and preferences described above in the context of the lubricating composition according to the invention.

[0169] The lubricating composition resulting from the above-described use may have one or more of the characteristics and preferences described above in the context of the lubricating composition according to the invention.

[0170] Example

[0171] In the remainder of the description, examples are given by way of illustration of the present invention and are not intended to limit the scope thereof in any way.

[0172] Example 1: Test to measure the drift of machining power required to perform an operation on an aluminum spindle

[0173] The lubricating compositions tested are detailed in Table 1. The percentages are expressed as weight percent relative to the total weight of the composition.

[0174] The ingredients used are as follows:

[0175] - PAG = an ordered triblock copolymer comprising propylene oxide units, ethylene oxide units and propylene oxide units in sequence, with a molecular weight of 1100 g / mol to 3000 g / mol;

[0176] - PEA = polyetherdiamine containing only propylene oxide units and having a molecular weight of 1000 g / mol to 3000 g / mol;

[0177] - pH adjuster = amine;

[0178] - Additives = additives commonly used in metalworking fluids, including in particular preservatives, antioxidants, emulsifiers.

[0179]

Table 1

[0180] CC1 CI1 PAG 20％ 20％ PEA - 4％ pH Adjusters 25％ 25％ water 37.12％ 33.12％ additive 17.88％ 17.88％

[0181] Lubricating compositions CC1 and CI1 were tested and compared.

[0182] The purpose of this test is to measure the torque obtained by drilling 7 holes in a row in aluminum material using a Microtap test machine. The test is carried out in sections. During the drilling process, a pre-hole with a depth of 6mm is drilled using a speed of 600rpm with a pitch between 2mm and 5mm.

[0183] The results are expressed as a percentage gain compared to a commercially available lubricating composition for machining aluminum (called reference).

[0184] The tests were performed at ambient temperature.

[0185] For the tests, the lubricating compositions described in Table 1 were diluted to 10% in water.

[0186] One drop of the lubricating composition to be tested is added to each well, and the wells are filled 100% with the lubricating composition to prevent air bubbles.

[0187] The solution is as follows:

[0188] - measure for each hole the torque exerted by the spindle containing the drill bit and calculate the average value of the power produced;

[0189] —Record the relationship between torque and time for each hole;

[0190] —Measure the temperature before / after each hole; calculate the average;

[0191] - Calculation of the relative torque and temperature rise of the tested composition with respect to the reference.

[0192] The results are shown in Table 2. The results (torque) are expressed as a percentage of the reference composition.

[0193]

Table 2

[0194] CC1 CI1 Gain % -1.3％ -6.9％

[0195] The results of Table 2 show that the power generated by the lubricating composition CI1 according to the invention for the lubrication of aluminum parts is significantly reduced. Therefore, the lubricating composition according to the invention has better properties than the comparative composition CC1.

[0196] Example 2: Test to measure the service life of steel

[0197] In this example, composition CI1 (see Table 1) was compared to a commercial composition available on the market for steel processing comprising an oil-in-water emulsion but without PAG or PEA (CC2).

[0198] For the tests, composition CI1 described in Table 1 was diluted to 8%.

[0199] The test plan is as follows:

[0200] The machine is a semi-industrial machine tool. It uses a steel tool to make 460 holes in a steel plate in sequence under the following conditions:

[0201] —Spindle speed N=6478rpm

[0202] —Cutting speed Vc=203m / min.

[0203] —Feed speed per revolution F = 0.3 mm / hole

[0204] —Drilling depth 42mm

[0205] —Diameter 10mm

[0206] Measure the diameter of the hole and the power required to create it.

[0207] The power drift and the diameter drift (also called metering drift) during machining are determined. The more significant the drift, the shorter the service life of the lubricating composition.

[0208] The results are shown in Table 3.

[0209]

Table 3

[0210]

[0211]

[0212] The results of Table 3 show that the lubricating composition according to the invention has a better service life during machining of steel parts than the commercial composition of the prior art.

[0213] Example 3: Test to measure lubrication properties (friction coefficient)

[0214] The lubricating compositions tested are detailed in Table 4. Percentages are expressed as weight percent relative to the total weight of the composition.

[0215] The ingredients used are as follows:

[0216] - PAG = an ordered triblock copolymer comprising propylene oxide units, ethylene oxide units and propylene oxide units in sequence, with a molecular weight of 1100 g / mol to 3000 g / mol;

[0217] - PEA = polyetherdiamine containing only propylene oxide units and having a molecular weight of 1000 g / mol to 3000 g / mol;

[0218] - pH adjuster = amine;

[0219] - Additives = additives commonly used in metalworking fluids, including in particular corrosion inhibitors and antioxidants.

[0220]

Table 4

[0221] CC3 CI2 PAG - 20％ PEA 20％ 4％ pH Adjusters 25％ 25％ water 37％ 41％ additive 14％ 14％

[0222] For the tests, the compositions described in Table 4 were diluted to 10% in water.

[0223] The purpose of the test is to measure the extreme pressure properties of the composition. Lubricating compositions CC3 and CI2 were tested and compared using a 4-ball test according to standard STM D2783 and adapted to the following parameters:

[0224] - Speed ​​close to 1500rpm,

[0225] - Ambient temperature, i.e. about 20°C,

[0226] - For the measurement of the welding load, the charging time is 1 minute, or for the measurement of the last load before grabbing, 10 seconds,

[0227] —The initial contact pressure is about 3.5GPa.

[0228] The extreme pressure is measured by rotating a stainless steel ball on three stainless steel balls that remain stationary and are completely covered with a lubricating film. A load is applied to the balls and gradually increased (in steps of 10 kg) until the balls weld together. The balls are replaced before each load increase.

[0229] The extreme pressure power corresponds to the load value at which the 4 balls are welded to each other, preventing the upper ball from rotating on the other 3. The greater the load, the higher the extreme pressure power.

[0230] The results are shown in Table 5. For this type of testing, the testing was carried out with the lubricating composition diluted on the machine, ie at a dilution between 8% and 10%.

[0231]

Table 5

[0232] CC3 CI2 Welding load (kgf) 120 140

[0233] The results of Table 5 show that the lubricating composition CI2 according to the present invention can have better extreme pressure properties than the comparative lubricating composition CC3.

[0234] The Plint SRV test was also used to evaluate and compare the lubricity of compositions CC3 and CI2.

[0235] The Plint SRV test was conducted according to the publication JSAE 9436260 (Frictional Characteristics of Organomolybdenum Compounds with Addition of Sulfurized Additives, Takashi Kikuchi, Yoko Yonekura, Kenyu Akiyama (Toyota Motor Corporation), pp. 105-108, 13) with the following characteristics:

[0236] - Range of motion: 2.2mm

[0237] —Frequency: 30Hz (0.13m / s),

[0238] —Load 150N,

[0239] —Temperature (℃): 40, 50, 60, 70.

[0240] The results are shown in Table 6. For this type of testing, the testing was carried out on the machine with the lubricating composition diluted, ie at a dilution between 8% and 10%.

[0241]

Table 6

[0242] Friction coefficient CC3 CI2 40℃ 0.13 0.12 50℃ 0.14 0.12 60℃ 0.15 0.11 70℃ 0.16 0.11

[0243] The results of Table 6 show that the lubricating composition CI2 according to the invention may have better lubrication properties than the comparative composition CC3, due to a lower coefficient of friction, more particularly at high temperatures.

[0244] To summarize the above embodiments, the lubricating composition including a combination of PAG and PEA according to the present invention can obtain excellent characteristics whether used for aluminum processing or steel processing, with excellent service life, reduced power generation and very good extreme pressure characteristics.

Claims

1. A lubricating composition comprising water and, relative to the total weight of the lubricating composition: - 1 to 60% by weight of poly(alkylene glycol), - 0.5 to 30% by weight of polyetheramine, The poly(alkylene glycol) is selected from block copolymers comprising ethylene oxide units and propylene oxide units.

2. The lubricating composition according to claim 1, comprising water and, relative to the total weight of the lubricating composition: - 5 to 50% by weight of poly(alkylene glycol) comprising alkylene oxide units containing 2 to 16 carbon atoms, preferably 2 to 8 carbon atoms, - 1 to 20% by weight of a polyetheramine selected from monoamines, diamines and triamines comprising units selected from alkylene oxides having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, The poly(alkylene glycol) is selected from block copolymers comprising ethylene oxide units and propylene oxide units.

3. The lubricating composition according to claim 1 or 2, further comprising at least one additive selected from the group consisting of alkaline bases, alkanolamines and mixtures thereof, The alkanolamine is preferably 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, and The alkaline base is preferably selected from potassium hydroxide and sodium hydroxide.

4. The lubricating composition according to any one of claims 1 to 3, wherein the one or more poly(alkylene glycols) are selected from block copolymers comprising ethylene oxide units and propylene oxide units and mixtures thereof, more preferably selected from ethylene oxide-propylene oxide diblock copolymers, propylene oxide-ethylene oxide-propylene oxide triblock copolymers and mixtures thereof.

5. The lubricating composition according to any one of claims 1 to 4, wherein the molecular weight of each poly(alkylene glycol) is 500 to 10000 g / mol, preferably 800 to 5000 g / mol, more preferably 1100 to 3000 g / mol.

6. The lubricating composition according to any one of claims 1 to 5, wherein each poly(alkylene glycol) has a viscosity of 10 mm at 40°C. 2 / s to 1000mm 2 / s, preferably 15mm 2 / s to 500mm 2 / s, more preferably 20 mm 2 / s to 400mm 2 / s.

7. The lubricating composition according to any one of claims 1 to 6, wherein the one or more polyetheramines are selected from monoamines comprising ethylene oxide units and / or propylene oxide units, diamines comprising ethylene oxide units and / or propylene oxide units, and mixtures thereof, preferably selected from diamines comprising ethylene oxide units and / or propylene oxide units.

8. The lubricating composition according to any one of claims 1 to 7, wherein the molecular weight of each polyetheramine is 500 to 5000 g / mol, preferably 1000 to 3000 g / mol.

9. Use of the lubricating composition according to any one of claims 1 to 8 as a metalworking fluid, the metal preferably being selected from steel and aluminium.

10. The use according to claim 9, wherein the composition is used for metal processing and / or forming and / or cutting and / or punching and / or rolling metal.

11. Use of 0.5 to 30 wt. % of a polyetheramine in a lubricating composition comprising water and 1 to 60 wt. % of a poly(alkylene glycol), relative to the total weight of the lubricating composition, to improve lubrication properties during metalworking with the lubricating composition, the one or more poly(alkylene glycols) being selected from block copolymers comprising ethylene oxide units and propylene oxide units.

12. The use according to claim 11, wherein the lubricating composition is as defined in any one of claims 1 to 8.

13. Use according to claim 11 or 12 for improving the lubricating properties of the lubricating composition during machining and / or forming and / or cutting and / or punching and / or rolling of metal.

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