Classifications

• • 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
  • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
  • C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M145/24—Polyethers
  • C10M145/26—Polyoxyalkylenes
  • C10M145/34—Polyoxyalkylenes of two or more specified different types
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  • 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
  • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
  • C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M145/24—Polyethers
  • C10M145/26—Polyoxyalkylenes
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  • 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
  • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
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  • 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
  • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
  • C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M145/24—Polyethers
  • C10M145/26—Polyoxyalkylenes
  • C10M145/28—Polyoxyalkylenes of alkylene oxides containing 2 carbon atoms only
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  • 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
  • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
  • C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M145/24—Polyethers
  • C10M145/26—Polyoxyalkylenes
  • C10M145/30—Polyoxyalkylenes of alkylene oxides containing 3 carbon atoms only
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  • 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
  • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
  • C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M145/24—Polyethers
  • C10M145/26—Polyoxyalkylenes
  • C10M145/32—Polyoxyalkylenes of alkylene oxides containing 4 or more carbon atoms
• • 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
  • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
  • C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M145/24—Polyethers
  • C10M145/26—Polyoxyalkylenes
  • C10M145/36—Polyoxyalkylenes 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
  • 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
  • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
• • 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
• • 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
  • C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three 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
  • C10M2209/106—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four 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
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • 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
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/09—Characteristics associated with water
• • 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
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/09—Characteristics associated with water
  • C10N2020/093—Insolubility in water
• • 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
  • C10N2030/24—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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/40—Low content or no content compositions
• • 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
  • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
• • 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
  • C10N2040/243—Cold 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 oil) for the cold rolling of aluminum, a process for the production of an aluminum product free of visible defects caused by fatty acids and the use of the cooling lubricant for aluminum rolling.
• rolling emulsions and rolling oils are used as cooling lubricants, which have a major impact on the cost-effectiveness 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 the lubrication in the roll gap, so that energy consumption, 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 in several passes (passes) in a so-called hot rolling stand to form a blank or strip. This is then subjected to cold rolling into thinner strip or foil.
• the strip or foil can undergo other known treatment processes (annealing, thermal or chemical degreasing).
• a rolling emulsion (O/W) is usually used as a cooling lubricant in hot rolling and a rolling oil in cold rolling.
• O/W rolling emulsion
• Hydrocarbon-based rolling oils are used as cooling lubricants in cold rolling stands.
• Lubricating additives can be added to these rolling oils.
• Typical lubricating additives are, for example, fatty alcohols, fatty acids and fatty acid esters.
• fatty acids used regularly such as lauric acid, myristic acid, palmitic acid or stearic acid
• the fatty acids used regularly are solid at temperatures below 40 °C and only evaporate at temperatures well above 300 °C.
• Solid or pasty deposits of fatty acids and metal soaps formed from them can therefore occur on components in the roll stand that are not constantly flooded with rolling oil after the more volatile rolling oil has evaporated. If these solid or pasty deposits detach from the roll stand or pipelines and get onto the aluminum strip or aluminum foil, visible defects can appear on the rolling stock that can no longer be eliminated by the following process steps (further rolling passes, roll cutting, thermal or chemical degreasing). can become.
• a further disadvantage of a fatty acid as a lubricating additive is that it can react with the components of the rolling stock, in particular with the rolling debris formed during forming.
• Metal soaps mainly aluminum soaps, can form. After the alcohol has been oxidized to form an acid, fatty alcohols can also react with abraded aluminum to form aluminum soaps.
• the aluminum soaps formed from the fatty acids used and aluminum abrasion have only a limited and low solubility in cold rolling oil. They also form agglomerates with the aluminum debris. Store these poorly soluble metal soaps and the metal soaps/metal abrasion agglomerates are deposited on the components of the cold rolling stand and can form the deposits mentioned in pipes and tanks.
• metal soaps or metal soaps/metal abrasion agglomerates detach from components of the rolling mill, cold rolling mill or pipe walls and get onto the aluminum strip or aluminum foil, there can also be visually visible defects on the rolled stock, which can be caused by the subsequent process steps to completion of the tape or foil can no longer be removed.
• Filters such as horizontal pressure plate filters and filter aids such as kieselguhr, perlite and fuller's earth can be used for this purpose.
• Increasing soap content in the rolling oil is counteracted by increased use of bleaching earth filter aids. However, this shortens the filter service life and increases both the amount of filter aid required and the amount of filter waste produced.
• the EP 3 124 583 A1 describes a water-soluble metalworking fluid containing a dicarboxylic acid having a sulfide structure, a polyalkylene glycol, a polyhydric alcohol/polyalkylene oxide adduct, and a monocarboxylic acid.
• a water-soluble composition and not a mineral oil-based composition is thus described.
• the EP 0 484 542 A1 describes a lubricant for metalworking, which contains a fatty alcohol or a fatty acid in addition to a mineral oil and a straight-chain olefin.
• the lubricant described therein may contain glycols. Glycols are not included in the sample compositions in this document.
• a disadvantage of olefins in lubricants is that after the aluminum strip has been annealed, they lead to high residues from ignition on aluminum sheets.
• the EP 3 124 583 A1 describes a water-soluble metal treatment agent that may contain a polyalkylene glycol in addition to fatty acids and fatty alcohols.
• the object of the invention is to provide a cooling lubricant with which the visually visible defects on aluminum strips or aluminum foils, which are often caused by fatty acids and/or fatty alcohols in cold rolling processes, can be avoided without impairing the lubricating effect and tribological activity of the rolling oil.
• the subject matter of the invention is also a method for producing an aluminum product (aluminum strip or aluminum foil), in which the above-mentioned cooling lubricant is used for cold-rolling an aluminum strip.
• the subject of the invention is the use of the above-mentioned cooling lubricant for cold-rolling an aluminum strip into a thinner aluminum strip than the aluminum strip that has not yet been cold-rolled or into an aluminum foil (aluminum product).
• the aluminum product obtained is free from visually visible defects caused by fatty acids and fatty alcohols. It shows surprisingly high wettability for water and N-methyl-2-pyrrolidone (NMP). Furthermore, if a high surface energy of the aluminum foil surface is desired, the aluminum product does not need a corona treatment.
• the cooling lubricant according to the invention is oil-soluble; it is immiscible with water.
• the cooling lubricant according to the invention is free from straight-chain olefins, in particular free from alpha-olefins having 6 to 40 carbon atoms.
• essentially free of a fatty acid means that a fatty acid is present as a lubricating additive in a proportion of at most 0.2% by weight, preferably at most 0.1% by weight, based on the mass of the cooling lubricant .
• essentially free of a fatty alcohol means that a fatty alcohol is present as a lubricating additive in a proportion of at most 0.4% by weight, preferably at most 0.3% by weight, based on the mass of the cooling lubricant . If the fatty acid content and/or the fatty alcohol content in the lubricant according to the invention is above the maximum value specified above, the wetting properties of the aluminum product rolled therewith deteriorate.
• Aluminum products within the meaning of the invention are aluminum sheets, aluminum strips and aluminum foils which have been subjected to cold rolling.
• An aluminum foil can have a thickness of 4 to 100 ⁇ m, for example, or it can be thicker than 100 ⁇ m.
• the term aluminum within the meaning of the invention includes aluminum and aluminum alloys.
• Polyalkylene glycols to be used in the present invention include common polyalkylene glycols and compounds having a polyalkylene glycol structure such as polyoxyalkylene fatty alcohol ether (ethoxylated fatty alcohol).
• the alkylene residue in the polyalkylene glycol or polyalkylene oxide can be ethylene, propylene or butylene (polyethylene glycols, polypropylene glycols, polybutylene glycols).
• the fatty alcohol can contain from 8 to 20 carbon atoms.
• the fatty alcohol residue can be, for example, decanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol. These compounds have lubricating and cooling properties when cold rolling aluminum.
• polyalkylene glycol used below includes polyalkylene glycols and compounds with a polyalkylene glycol structure.
• the polyalkylene glycols used according to the invention can have a kinematic viscosity of 5 mm 2 /s to 250 mm 2 /s, preferably 10 mm 2 /s to 200 mm 2 /s at 40.degree.
• the polyalkylene glycols used according to the invention are liquid at temperatures above 5° C. and are therefore easy to dose. They can be water-insoluble or water-soluble.
• ethoxylated fatty alcohols such as tetraethylene glycol monododecyl ether
• polyalkylene glycols or a compound containing polyalkylene oxide.
• ethoxylated fatty alcohols such as tetraethylene glycol monododecyl ether
• polyalkylene glycols or a compound containing polyalkylene oxide.
• Corresponding polyalkylene glycols are commercially available.
• the proportion of polyalkylene glycol in the rolling oil according to the invention can be up to 10% by weight, in particular 0.01 to 8% by weight and particularly preferably 0.1 to 5% by weight, based in each case on the mass of the rolling oil.
• the polyalkylene glycol therefore replaces the additives fatty acids and fatty alcohols usually found in cold rolling lubricants.
• the cooling lubricant according to the invention has a good lubricating effect or tribological effect without the aforementioned disadvantageous effects of fatty acids and fatty alcohols.
• the cooling lubricant according to the invention is based on a hydrocarbon base oil with a boiling point in the range from 180 to 300° C., measured according to DIN EN ISO 3405.
• the base oil contains straight-chain and branched hydrocarbons.
• the base oil may contain a mixture of hydrocarbons.
• the proportion of aromatics therein can preferably be less than 1% by weight, based on the mass of the base oil.
• the base oil can be a mineral oil or a synthetic oil. It can contain natural and/or synthetic n-paraffins and/or natural and/or synthetic isoparaffins.
• the kinematic viscosity of this low-aromatic hydrocarbon mixture can be 1.5 to 3.6 mm 2 /s at 20 °C. This kinematic viscosity provides good flow properties in the cold rolling mill and enables uniform lubrication and cooling.
• the proportion of the base oil in the cooling lubricant according to the invention can be 90% by weight or more, based on the mass of the cooling lubricant.
• the proportion of the base oil can be, for example, 90% by weight to 99% by weight of the mass of the cooling lubricant.
• the cooling lubricant according to the invention can contain customary additives to increase the high-pressure lubricating properties, antioxidants and conductivity improvers.
• Additives for enhancing extreme pressure lubricity include esters of C 10-14 straight chain saturated carboxylic acids. Such include, for example, butyl stearate and methyl dodecanoate. Methyl dodecanoate is particularly preferred. These can be contained in an amount of up to 10% by weight, preferably 1 to 8% by weight, based on the mass of the cooling lubricant.
• Suitable antioxidants include sterically hindered monohydric, dihydric and trihydric phenols and polynuclear phenols, especially tert-butyl phenols. A typical representative of this group is methylene-4,4'-bis-(2,6-di-tert-butylphenol).
• Other suitable antioxidants include amines such as diphenylamine, phenyl- ⁇ -naphthylamine, p,p'-tetramethyldiaminodiphenylmethane and N,N'-diphenyl-p-phenyldiamine.
• An antioxidant mentioned above can be used in combination with other antioxidants such as sulfides and polydisulfides in the usual concentrations.
• the cooling lubricant according to the invention allows the aluminum product obtained after cold rolling to be further processed for a number of applications without corona treatment being necessary. Nevertheless, a surface energy is achieved on the surface of the aluminum product, such as is found after corona treatment on aluminum products that have been cold rolled in the presence of fatty acids and fatty alcohols. In addition, the surface of the aluminum product has high wettability for water and N-methyl-2-pyrrolidone (NMP).
• NMP N-methyl-2-pyrrolidone
• the aluminum product contains residues of the polyalkylene glycol used in the cooling lubricant according to the invention on its surface.
• the amount of polyalkylene glycol on the aluminum product after cold rolling can be as high as 5 mg/m 2 or more. After the process according to the invention has been carried out, for example 0.01 mg/m 2 to 5 mg/m 2 of polyalkylene glycol or a compound containing a polyalkylene oxide structure can be present on the surface of the aluminum product.
• the lubricant according to the invention results in a significant reduction in the number of visually visible defects on the aluminum strips or aluminum foils produced. This is probably due to the fact that rolling oil components do not form deposits on the rolling stock that are difficult to remove. The omission of fatty alcohols appears to increase this reduction. Residues of the rolling oil according to the invention can be easily removed chemically or thermally from the surface of the rolling stock, or the surface of the rolling stock shows only a small amount of residue formation after thermal degreasing.
• the lubricating properties of the cooling lubricant according to the invention were determined using an MTM2 Mini-Traction machine from PCS Instruments in the standard configuration with a load-applying steel ball (diameter 19.05 mm) and an aluminum test disc rotating at different speeds.
• the load on the test disc from the ball (3 ⁇ 4"ball bearing steel AISI 52100 (100Cr6, 1.3505)) was set to 40N (0.5 GPa contact pressure) and coefficients of friction (RK) at different rolling speeds of.
• the following Table 1 shows the two mean values (MW) of the coefficients of friction measured at rolling speeds from 1 to 200 m/min.
• the disc was formed from an aluminum alloy AA1XXX.
• the slip/roll ratio (SRR) during the test was 50%.
• Table 1 lubricant sample Viscosity mm 2 /s RK MW 0.2-200m/min Drop size 5 ⁇ l water in mm Remarks 1 base oil 1.9 0.07; 0.08 3.1 lubricating film formation suboptimal; metal soaping 2 base oil + 0.9% fatty acid + 0.9% methyl laurate 1.9 0.06; 0.05 2.5 good lubricating film; more abrasion in the KSS but clean disc 3 rolling oil with 1% PAG* (visco 20 mm 2 /s at 40 °C) 1.9 0.05; 0.05 3.1 better lubricating film formation than pure rolling oil 4 rolling oil with 2% PAG* (visco 20 mm 2 /s at 40 °C] 1.9 0.04; 0.04 3.5 lubricating film formation good; hardly any track on the ball 5 rolling oil with 4% PAG* (visco 20 mm 2 /s at 40 °C) 2.0 0.03; 0.03 3.5 hardly any abrasion 6 rolling oil with 2% PAG compound** (
• Lubricant sample 2 provides a good lubricating film with more wear but with a clean disc.
• Lubricant sample 3 according to the invention provides better lubricating film formation. The same is true for sample 4, which moreover hardly shows any track on the ball. This also applies to sample 5, which gives hardly any abrasion.
• Samples 6 to 12 show good lubricating film formation. Samples 6 and 7 show some abrasion, sample 8 shows hardly any abrasion. Sample 6 shows acceptable water wetting, sample 7 good wetting and sample 8 very good water wetting. Sample 10 gives hardly any abrasion and hardly any track on the ball. Samples 11 and 12 provide little tracking on the ball.

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• 2020
  • 2020-08-17 EP EP20191350.6A patent/EP3957708A1/fr not_active Withdrawn
• 2021
  • 2021-08-17 WO PCT/EP2021/072781 patent/WO2022038111A1/fr not_active Ceased
  • 2021-08-17 JP JP2023512129A patent/JP2023535646A/ja active Pending
  • 2021-08-17 EP EP21762692.8A patent/EP4196558B1/fr active Active
  • 2021-08-17 KR KR1020237008238A patent/KR102636604B1/ko active Active
  • 2021-08-17 CA CA3191862A patent/CA3191862C/fr active Active
  • 2021-08-17 CN CN202180050723.0A patent/CN115885025B/zh active Active
• 2023
  • 2023-02-17 US US18/171,003 patent/US12215295B2/en active Active

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