EP4310164A1 - Lubrifiant réfrigérant pour le laminage à chaud de l'aluminium - Google Patents

Lubrifiant réfrigérant pour le laminage à chaud de l'aluminium Download PDF

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Publication number
EP4310164A1
EP4310164A1 EP22186523.1A EP22186523A EP4310164A1 EP 4310164 A1 EP4310164 A1 EP 4310164A1 EP 22186523 A EP22186523 A EP 22186523A EP 4310164 A1 EP4310164 A1 EP 4310164A1
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EP
European Patent Office
Prior art keywords
acid
cooling lubricant
lubricant concentrate
weight
concentrate according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22186523.1A
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German (de)
English (en)
Inventor
René Liedtke
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Speira GmbH
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Speira GmbH
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Publication date
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Priority to EP22186523.1A priority Critical patent/EP4310164A1/fr
Priority to PCT/EP2023/070219 priority patent/WO2024018030A1/fr
Publication of EP4310164A1 publication Critical patent/EP4310164A1/fr
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/02—Water
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/106—Naphthenic fractions
    • C10M2203/1065—Naphthenic fractions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/1253—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/023—Amines, e.g. polyalkylene polyamines; Quaternary amines used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08—Amides
    • C10M2215/082—Amides containing hydroxyl groups; Alkoxylated derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/06—Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/24—Emulsion properties
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/242—Hot working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/245—Soft metals, e.g. aluminum

Definitions

  • the invention relates to a cooling lubricant (rolling emulsion) for hot rolling aluminum and the use of the cooling lubricant for rolling aluminum.
  • rolling emulsions and rolling oils are used as cooling lubricants, which have a major influence on the economic efficiency of production and the quality of the products.
  • the coefficient of friction between the work roll and the rolling stock should be neither too high nor too low.
  • a low coefficient of friction improves lubrication in the roll gap, so that energy expenditure, frictional heat and roll wear in the rolling process are reduced.
  • Aluminum strips and foils are usually produced by rolling in a two-stage rolling process.
  • an aluminum ingot is first rolled into a blank or a strip in several passes (passes) in a so-called hot rolling mill using a rolling emulsion as a cooling lubricant.
  • This is then subjected to cold rolling using a rolling oil as a cooling lubricant into a thinner strip or foil.
  • the tape or film can undergo other known treatment processes (annealing, thermal or chemical degreasing).
  • roller emulsions are usually used as cooling lubricants. This is because the temperatures when hot rolling aluminum can usually reach around 500°C. At these temperatures, pure rolling oil would otherwise burn immediately.
  • These roller emulsions are oil in water emulsions (O/W).
  • the oil concentration of a hot rolling emulsion is generally approximately 1 to 10% by weight based on the total weight of the hot rolling emulsion.
  • the rolling emulsions used for hot rolling serve, on the one hand, to lubricate the rolling stock and the roll, as well as to continuously cool the rolling stock, and on the other hand, to remove the aluminum abrasion resulting from rolling from the roll gap between the roll and the rolling stock, so that there are no residues on the surface of the rolling stock remain, which can have a negative impact on the surface quality and properties of the rolled stock.
  • a typical hot rolling emulsion has an oil content of 2-10%.
  • the main component is usually a mineral oil-based base oil, to which additional additives are added, for example to control lubricity, oil particle size distribution or corrosion protection
  • Common lubricating additives include fatty alcohols, fatty acids and fatty acid esters.
  • the fatty acids used also serve as emulsifiers for the oil phase of the roller emulsion and have a decisive influence on the stability and droplet size distribution of the roller emulsion.
  • non-ionic emulsifiers are often used as additional emulsifiers, which have a lower sensitivity to foreign ions than ionic emulsifiers.
  • fatty acids mainly aluminum soaps
  • Fatty alcohols can also react with aluminum abrasion to form aluminum soaps after the alcohol has oxidized to acid.
  • the aluminum soaps formed are important for the lubricity of the roller emulsion, but they only have a limited solubility in the roller emulsion and form agglomerates with the aluminum wear particles.
  • These poorly soluble metal soaps and the metal soap/metal abrasion agglomerates are deposited on the components of the hot rolling stand and can lead to significant deposits, particularly on the rolling stand. These deposits can cause severe corrosive attack on the stand components of the hot rolling stand.
  • metal soaps or metal soaps/metal abrasion agglomerates detach from components of the rolling mill, hot rolling mill or from pipe walls and get onto the aluminum strip or aluminum foil, visually visible defects can also occur on the rolling stock, which can be completed by the following process steps of the tape or film can no longer be removed.
  • the proportion of fatty acid in the roller emulsion can gradually decrease due to the reaction of the fatty acids with the aluminum abrasion to form metal soaps in the roller emulsion.
  • the fatty acid in the roller emulsion acts as an emulsifier, which stabilizes the oil droplets in the aqueous phase and thus the emulsion as a whole.
  • the reduction of the fatty acid content through the formation of metal soaps leads, in addition to sludging of the emulsion due to the formation of metal soaps, to a destabilization of the emulsion.
  • fatty acid esters In contrast to fatty acids and fatty alcohols, fatty acid esters do not have the problem of metal soap formation and therefore do not contribute to the destabilization of the emulsion.
  • the disadvantage of using fatty acid esters is that larger amounts of them are required to obtain a good lubricating effect.
  • the fatty acid esters are usually significantly more expensive than the corresponding fatty acids.
  • Another factor that affects the stability of the rolling emulsion is the entry of foreign oils, such as hydraulic oil from leaks from pumps on the hot rolling mill.
  • Destabilization of the emulsion is characterized by a high average drop size distribution of the oil droplets and the presence of large amounts of free, non-emulsified oil. If destabilization gets out of hand, this will have a negative overall effect on the rolling process. In addition, the consumption of the roller emulsion increases and significant sludge problems can sometimes be observed in the system.
  • a stable roller emulsion on the other hand, has only a small average drop size distribution of the oil droplets and the amount of free, non-emulsified oil is small.
  • Balanced stability means that the stability of the roller emulsion is neither too high nor too low, but is in the ideal range between these two points.
  • the setting of the emulsion stability has a significant influence on the product and process quality.
  • the proportion of aluminum abrasion increases, which increases the risk of visually visible defects on the rolling stock and also has a negative effect on the stability of the emulsion through the formation of metal soaps with the fatty acids contained in the emulsion and corrosion on the rolling stand favored.
  • the condition of the rolling emulsion is therefore monitored during hot rolling. If the stability of the emulsion is reduced unfavorably, which can be determined, for example, by measuring the average drop size distribution of the roller emulsion, this is usually counteracted by suitable measures, such as partial or complete replacement of the roller emulsion.
  • suitable measures such as partial or complete replacement of the roller emulsion.
  • replacing the entire roll emulsion or parts of the roll emulsion is uneconomical because, in addition to the costs for the raw materials of the new roll emulsion, this also leads to considerable downtime of the roll stand.
  • the present invention is based on the object of providing a cooling lubricant concentrate for the hot rolling of aluminum, which gives the cooling lubricant containing the cooling lubricant concentrate a balanced emulsion stability and, due to its use in the cooling lubricant for hot rolling, the above-mentioned problems therefore do not occur or only occur to a significantly lesser extent .
  • a cooling lubricant concentrate for hot rolling aluminum which contains at least one alkoxylated fatty acid amide, at least one amine and at least one fatty acid.
  • a cooling lubricant concentrate which comprises at least one combination of the above-mentioned additives, when used in a cooling lubricant for hot rolling aluminum, leads to a balanced, stable rolling emulsion in which the formation of metal soaps and metal abrasion is significantly reduced.
  • the subject of the invention is therefore also a cooling lubricant according to the invention containing the cooling lubricant concentrate according to the invention.
  • a cooling lubricant containing the cooling lubricant concentrate according to the invention has to be partially or completely replaced significantly less frequently under the same operating conditions in the hot rolling mill compared to a conventional cooling lubricant from the prior art and has good lubricating properties for significantly longer.
  • Cooling lubricant concentrate according to the invention for rolling, in particular hot rolling, of aluminum for a significant reduction in corrosion attack by metal soaps and metal soap/metal abrasion agglomerates on the hot rolling stand. It was also observed that a cooling lubricant containing the cooling lubricant concentrate according to the invention has a lower sensitivity to the entry of foreign oils into the cooling lubricant. Overall, the use of the cooling lubricant containing the cooling lubricant concentrate according to the invention for rolling, in particular hot rolling, of aluminum leads to a significantly improved product and process quality compared to conventional cooling lubricants.
  • a cooling lubricant concentrate is understood to mean a composition which produces a cooling lubricant by mixing at most 10% by weight of cooling lubricant concentrate with at least 90% by weight of water.
  • the cooling lubricant is an oil-in-water emulsion, which can alternatively be referred to as a hot rolling emulsion.
  • a hot rolling emulsion as used here, is to be understood as distinct from a rolling oil, which is only used for cold rolling aluminum. In contrast to rolling oil, which is usually based on paraffinic oils, hot rolling emulsions are usually based on naphthenic oils.
  • the cooling lubricant concentrate according to the invention contains at least one alkoxylated fatty acid amide.
  • the proportion of the at least one alkoxylated fatty acid amide in the cooling lubricant concentrate according to the invention can be 1 to 10% by weight, in particular 1 to 5% by weight, based on the total weight of the cooling lubricant concentrate.
  • the at least one alkoxylated fatty acid amide is selected from the group consisting of ethoxylated fatty acid amides and propoxylated fatty acid amides and their Mixtures.
  • the alkoxylated fatty acid amide acts as a nonionic emulsifier.
  • the cooling lubricant concentrate according to the invention also contains at least one amine. It has proven to be particularly practical if an amino alcohol is used as the amine.
  • the at least one amine is particularly preferably triethanolamine.
  • the proportion of the at least one amine in the cooling lubricant concentrate according to the invention can be between 1 and 8% by weight, preferably between 1 and 5% by weight, based on the total weight of the cooling lubricant concentrate.
  • the cooling lubricant concentrate according to the invention contains at least one fatty acid.
  • the proportion of the at least one fatty acid in the cooling lubricant concentrate according to the invention is between 5 and 28% by weight, in particular between 15 and 25% by weight, based on the total weight of the cooling lubricant concentrate.
  • the at least one fatty acid is preferably selected from saturated or simple or polyunsaturated C 14 -C 22 fatty acids and mixtures thereof, in particular from the group consisting of myristic acid, myristoleic acid, pentadecanoic acid, palmitic acid, palmitoleic acid, margaric acid, margaroleic acid, stearic acid, petroselinic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, alpha-linolenic acid, Gamma-linolenic acid, calendulic acid, punichic acid, alpha-eleostearic acid, beta-eleostearic acid, stearidonic acid, nonadecanoic acid, arachidic acid, arachidonic acid, eicosapentaic acid, gadoleic acid.
  • the at least one fatty acid is a mono- or polyunsaturated cis-fatty acid, in particular oleic acid.
  • the amine contained in the cooling lubricant concentrate according to the invention enters into an acid-base reaction with the fatty acid when used in the cooling lubricant according to the invention. This reaction forms an organic soap from the fatty acid.
  • the cooling lubricant concentrate according to the invention can also contain one or more esterified fatty acids as lubricating additives.
  • Esterified fatty acids are typically used for this purpose.
  • the proportion of one or more esterified fatty acids in the cooling lubricant concentrate according to the invention can be between 0 and 40% by weight, preferably between 5 and 30% by weight, based on the total weight of the cooling lubricant concentrate.
  • the cooling lubricant concentrate according to the invention can also contain at least one base oil based on saturated cyclic hydrocarbons.
  • “based on saturated cyclic hydrocarbons” means that the base oil contains more than 50% by weight of saturated cyclic hydrocarbons based on the total weight of the base oil.
  • the base oil based on saturated cyclic hydrocarbons preferably consists of 85 to 95% by weight of saturated cyclic hydrocarbons and 5 to 15% by weight of saturated linear hydrocarbons. To simplify matters, these base oil mixtures can also be referred to as naphthenic base oils.
  • the proportion of the at least one base oil in the cooling lubricant concentrate according to the invention can be 44 to 85.5% by weight, in particular 55 to 65% by weight, based on the total weight of the cooling lubricant concentrate. It has proven to be particularly practical if the base oil has a viscosity of 20 to 40 mm 2 /s (cSt), in particular 23 to 27 mm 2 /s (cSt), measured according to ASTM D445. This viscosity provides good flow properties in the hot rolling stand and enables uniform lubrication and cooling of the rolling stock.
  • the cooling lubricant concentrate according to the invention can also contain 0.5 to 10% by weight of additives.
  • the additives that are generally known to those skilled in the art for cooling lubricant concentrates for hot rolling aluminum are generally suitable as additives.
  • Common additives include, for example, other non-ionic emulsifiers, high-pressure additives, antioxidants, corrosion inhibitors, biocides and solubilizers.
  • the additives are free of corrosion inhibitors and biocides. Free within the meaning of the invention means that the additives do not contain any additional corrosion protection agents and biocides. It has been found that the cooling lubricant concentrate according to the invention when used in the cooling lubricant according to the invention, despite the absence of biocides and corrosion inhibitors, leads to reduced corrosion on the hot rolling stand compared to conventional corrosion inhibitors and to less sludging when considering an identical hot rolling process over the same time. The use of biocides and corrosion inhibitors as additives can therefore be dispensed with in the present cooling lubricant concentrate. This makes the use of the cooling lubricant concentrate according to the invention more economical and less harmful to health and the environment.
  • the cooling lubricant concentrate according to the invention contains at least one high-pressure additive and at least one antioxidant as an additive.
  • all commonly used high-pressure additives and antioxidants known to those skilled in the art can be used as the at least one high-pressure additive and the at least one antioxidant.
  • the at least one high-pressure additive is a phosphoric acid ester.
  • the at least one high-pressure additive can be contained in the cooling lubricant concentrate according to the invention in amounts of between 1 and 8% by weight, in particular between 2 and 6% by weight, based on the total weight of the cooling lubricant concentrate.
  • the at least one antioxidant can advantageously be contained in the cooling lubricant concentrate according to the invention in amounts of 0.1 to 3% by weight, in particular 0.1 to 1% by weight, based on the total weight of the cooling lubricant concentrate.
  • Another object of the invention is a cooling lubricant containing the cooling lubricant concentrate according to the invention and water.
  • the cooling lubricant has 2 to 10% by weight, in particular 3 to 7% by weight, of the cooling lubricant concentrate according to the invention and 90 to 98% by weight, in particular 93 to 97% by weight, of water, on.
  • the water used can advantageously be deionized water. In this way, the balanced stability of the cooling lubricant and thus its long-lasting, good lubricity can be particularly ensured.
  • the invention also relates to the use of the cooling lubricant according to the invention for rolling, in particular for hot rolling, aluminum.
  • Figure 1 shows the determined coefficients of friction of the cooling lubricant according to the invention and of the cooling lubricant according to the prior art at different rolling speeds.
  • Cooling lubricant concentrate according to the state of the art Cooling lubricant concentrate according to the invention base oil 59.5% by weight 57.5% by weight Oleic acid 20% by weight 20% by weight Triethanolamine 3% by weight 3% by weight fatty acid esters 5% by weight 5% by weight Polyethylene glycol dodecyl ether 2% by weight 2% by weight Phosphoric acid esters 4.5% by weight 4.5% by weight antioxidant 1.5% by weight 1.5% by weight Solution facilitator 3% by weight 3% by weight Water 1.5% by weight 1.5% by weight Alkoxylated fatty acid amide 0% by weight 2% by weight Average drop size distribution 2.9 ⁇ m 2.8 ⁇ m Average coefficient of friction ⁇ 0.07 0.03 Abrasion quantities + ++ Degree of corrosion 3 1
  • Table 1 shows that the cooling lubricant according to the invention, containing the cooling lubricant concentrate according to the invention, has a similar drop size distribution and lower coefficients of friction than the comparison cooling lubricant containing a cooling lubricant concentrate according to the prior art.
  • the cooling lubricant according to the invention, containing the cooling lubricant concentrate according to the invention also leads to reduced amounts of abrasion during lubrication and has a significantly lower corrosiveness than the comparison cooling lubricant containing cooling lubricant concentrate according to the prior art.
  • the average drop size distribution was determined using a Malvern Master Sizer 2000 from Malvern Panalytical. After preparing the cooling lubricants to be examined, a bubble-free sample was placed in the measuring vessel to determine the average drop size distribution and measured after 10, 20, 40, 60 and 90 minutes. The corresponding d(4.3) values from the measurement protocols of the measurements after 10 minutes were used as the average drop size distribution in the examples given here.
  • the friction properties were determined using a mini traction machine (MTM) from PCS Instruments. 3/4" chrome steel and a disk (275 ⁇ m AlMg4.5Mn0.4) were used as test objects. 40 N was used as the contact pressure.
  • This Slide-to-roll ratio (SRR) was set to 50% and the test was carried out at a cooling lubricant temperature of 80 °C. Freshly prepared cooling lubricant, prepared as described above, was used as the test medium. Rolling speeds between 0.3 m/min and 192 m/min were examined during the test. All rolling speeds were examined five times with the same cooling lubricant and the corresponding coefficients of friction were determined. The cooling lubricant was then removed from the test vessel and replaced with fresh cooling lubricant of the same type.
  • the friction coefficients were again determined five times at the different rolling speeds under the conditions described. All 10 measurement curves obtained were then averaged. The friction coefficients are the averaged friction coefficients of all measurements in the rolling speed range between 1 and 10 m/min. The measurement results can Figure 1 be removed.
  • the cooling lubricant from the tests was collected and the amount of abrasion was visually assessed after 24 hours at room temperature.
  • the aluminum discs and steel balls were washed and the wear and amount of abrasion were also visually assessed.
  • the corrosiveness of the individual cooling lubricants was determined using DIN 51 360 - 2, modified, without salt addition. This was used commercially available test kit profluid ® CorrSet from Profluid. Gray cast iron chips were covered with the cooling lubricant on filter paper and stored at 30 °C for 2 h. After two hours, the filter paper was cleaned and dried and the degree of corrosion was determined using the reading scheme presented in the kit's instructions for use. Cooling lubricants from the MTM friction tests were used as the test liquid.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
EP22186523.1A 2022-07-22 2022-07-22 Lubrifiant réfrigérant pour le laminage à chaud de l'aluminium Pending EP4310164A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22186523.1A EP4310164A1 (fr) 2022-07-22 2022-07-22 Lubrifiant réfrigérant pour le laminage à chaud de l'aluminium
PCT/EP2023/070219 WO2024018030A1 (fr) 2022-07-22 2023-07-20 Lubrifiant de refroidissement pour le laminage à chaud d'aluminium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22186523.1A EP4310164A1 (fr) 2022-07-22 2022-07-22 Lubrifiant réfrigérant pour le laminage à chaud de l'aluminium

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EP4310164A1 true EP4310164A1 (fr) 2024-01-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1176076A (en) * 1966-05-27 1970-01-01 Mobil Oil Corp Metal Working Lubricant.
EP0362430A1 (fr) * 1987-05-21 1990-04-11 Aluminum Company Of America Lubrifiant pour le travail du métal, contenant une micro-émulsion d'huile dans l'eau
WO2004092311A1 (fr) * 2003-04-16 2004-10-28 Nippon Oil Corporation Lubrifiant pour traitement d'aluminium
WO2014084171A1 (fr) * 2012-11-27 2014-06-05 日本クエーカー・ケミカル株式会社 Composition de fluide de traitement de métaux soluble dans l'eau, procédé de meulage de métaux et pièce de travail de meulage
US20160186084A1 (en) * 2014-12-30 2016-06-30 Exxonmobil Research And Engineering Company Lubricating oil compositions with engine wear protection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1176076A (en) * 1966-05-27 1970-01-01 Mobil Oil Corp Metal Working Lubricant.
EP0362430A1 (fr) * 1987-05-21 1990-04-11 Aluminum Company Of America Lubrifiant pour le travail du métal, contenant une micro-émulsion d'huile dans l'eau
WO2004092311A1 (fr) * 2003-04-16 2004-10-28 Nippon Oil Corporation Lubrifiant pour traitement d'aluminium
WO2014084171A1 (fr) * 2012-11-27 2014-06-05 日本クエーカー・ケミカル株式会社 Composition de fluide de traitement de métaux soluble dans l'eau, procédé de meulage de métaux et pièce de travail de meulage
US20160186084A1 (en) * 2014-12-30 2016-06-30 Exxonmobil Research And Engineering Company Lubricating oil compositions with engine wear protection

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