EP3927797B1 - Lubrifiant pour la transformation chaude de métaux - Google Patents

Lubrifiant pour la transformation chaude de métaux Download PDF

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Publication number
EP3927797B1
EP3927797B1 EP20706258.9A EP20706258A EP3927797B1 EP 3927797 B1 EP3927797 B1 EP 3927797B1 EP 20706258 A EP20706258 A EP 20706258A EP 3927797 B1 EP3927797 B1 EP 3927797B1
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Prior art keywords
lubricant
graphite
cellulose
phlogopite
particularly preferably
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German (de)
English (en)
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EP3927797A1 (fr
Inventor
Steffen Bugner
Dirk Masurat
Clémence LONGIS
Marvin BARGON
Nicole WEYER
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Chemische Fabrik Budenhiem KG
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Chemische Fabrik Budenhiem KG
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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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • 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
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • C10M2201/1026—Silicates used as thickening agents
    • 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
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • C10M2201/103—Clays; Mica; Zeolites
    • 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
    • C10M2201/12—Glass
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022—Ethene
    • 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
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/06—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid
    • C10M2209/062—Vinyl esters of saturated carboxylic or carbonic acids, e.g. vinyl acetate
    • 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
    • C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
    • C10M2209/126—Polysaccharides, e.g. cellulose, biopolymers used as thickening agents
    • 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
    • C10N2030/04—Detergent property or dispersant property
    • 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
    • C10N2030/16—Antiseptic; (micro) biocidal or bactericidal
    • 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
    • C10N2030/18—Anti-foaming property
    • 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
    • C10N2040/241—Manufacturing joint-less pipes
    • 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

Definitions

  • the invention relates to an essentially graphite-free and boron-free mandrel bar lubricant for use in the hot forming of metals for the production of seamless tubes, in particular in so-called continuous processes or push bench processes.
  • lubricants are required that ensure optimal sliding of the metal between the processing tools at high processing temperatures. Temperatures of 1100 to 1300 °C can occur during the production of profile sheets or seamless tubes in rolling mills. If hard metals or metals that are difficult to deform are processed, the processing tools can wear out quickly. High coefficients of friction between tool and workpiece also lead to increased energy consumption during processing.
  • seamless tubes are formed in the main process step by rolling a prefabricated hollow block at around 1200°C to 1300°C over a mandrel bar.
  • the mandrel bar is removed from the rolled tube blank and cooled in a cooling bath or by spray cooling with water and prepared for the next rolling process.
  • This preparation of the mandrel bar after cooling also includes lubrication in which the lubricant is sprayed onto the mandrel bar.
  • This lubrication is essential for optimal sliding of the hollow billet on the mandrel bar during the rolling process and is also crucial for the later quality and dimensional accuracy of the tube, especially for the condition of the inner surface of the tube.
  • the mandrel bar lubricants used must have good lubricating properties and at the same time withstand the high machining temperatures.
  • the good lubricating properties include not only that the lubricants are suitable for reducing the coefficient of friction between the mandrel bar, but also that they have good wetting properties and form a lubricant film that is as continuous as possible with a sufficient layer thickness on the mandrel bar.
  • the lubricants contain additives that additionally reduce scale formation on the surface of the metal being processed, such as boron compounds, e.g.
  • Known lubricants can be divided into graphite-containing and graphite-free lubricants.
  • Graphite-free lubricants are also referred to as "white" lubricants because they are not colored by the strong inherent color of the graphite.
  • Graphite is a suitable lubricant additive for high-temperature applications, such as the hot forming of metals, because graphite is particularly heat-resistant and has particularly good lubricating properties itself and in combination with mineral oils and inorganic salts.
  • a disadvantage of lubricants containing graphite is that the high carbon content can lead to carburization of the metal surface of the workpiece. This can result in defective end products with poor further processing or material properties. The result is a high level of rejects.
  • the use of graphite in the working environment raises health concerns, which necessitate particularly costly protective measures for the people working in the working environment.
  • a group of lubricants that can contain graphite or be graphite-free contain salts or salt mixtures that melt on the hot surface of the workpiece and form a lubricating separating layer between the workpiece and the tool through the melt.
  • salts or salt mixtures that melt on the hot surface of the workpiece and form a lubricating separating layer between the workpiece and the tool through the melt.
  • only certain salts are suitable for this and some of them have such high melting temperatures that the lubricants are only fully usable once the operating temperature has been reached. This is particularly disadvantageous when the processing machines are started up when the tools or workpieces are still cold.
  • borax is used as a low-melting salt.
  • lubricants containing borax can also cause the tool and workpiece to stick together, with the result that the tool is damaged or the machines come to a standstill. Furthermore, lubricants containing borax adversely attack the metal surface of the tool or workpiece.
  • lubricants use raw common salt, but this can lead to material being removed from the workpiece and material being deposited elsewhere, and thus to the formation of grooves.
  • common salt leads to increased metal corrosion on the systems, which results in high maintenance costs.
  • Another group of high-temperature lubricants contains alkali phosphate glasses or silicate glasses with various additives such as boron or aluminum. These lubricants have good lubricating properties, but are poorly soluble in water, which makes their removal from the machined workpiece considerably more difficult and requires a high level of technical effort.
  • mandrel bar lubricants with a high graphite content are still predominantly used due to the high demands on lubricating properties and temperature resistance.
  • Graphite-free or low-graphite (“white”) mandrel bar lubricants are hardly ever used, despite the disadvantages described above and others.
  • Lubricants suitable for this purpose are expensive and require large amounts to be used, which has a disadvantageous effect on the manufacturing costs and thus on the cost of the product.
  • the CN-A-104 694 240 discloses a non-graphite lubricant composition
  • a non-graphite lubricant composition comprising 10-90% by weight mineral clay, 0-5% by weight stearate, 0.1-5% by weight of a thickener, preferably sodium polyacrylate, 5-30% by weight water-soluble borate and /or boric acid and other additives such as surfactants and polymers.
  • the CN-A-102 732 367 discloses a graphite-free lubricant composition which contains 15-20% by weight of glass powder, 2.5-8% by weight of a white solid lubricant, 0.5-3.5% by weight of a thickener, and other additives such as surfactants and resins.
  • the white solid lubricant includes one or more compounds from the group consisting of mica, talc and boron nitride. Gelatine or cellulose is used as a thickener.
  • the known lubricants for the hot forming of metals therefore have a number of disadvantages due to and depending on their respective composition, such as health and environmental hazards and the associated necessary protective measures, high consumption due to the large amounts required, high costs of the components of the compositions, unfavorable coefficients of friction , adverse effects on the manufacturing process and/or the properties of the manufactured product, such as gluing or welding
  • the object of the present invention was therefore to provide a mandrel bar lubricant which overcomes the disadvantages of the prior art and which is particularly suitable as a mandrel bar lubricant for the hot forming of metals in the production of seamless tubes in continuous processes or push bench processes and compared to those previously used in these processes used, based on graphite lubricants contains no or at most a small amount of graphite, has good coefficients of friction and good wetting properties and compared to known lubricants for the same application requires smaller quantities and / or is cheaper to produce
  • a major advantage of the lubricant according to the invention is that it has very good coefficients of friction and wetting properties, particularly in the production of seamless tubes in continuous processes or push bench processes, which are comparable or comparable to those of graphite-containing lubricants currently used in these processes with the same or smaller layer thicknesses or amounts used are even superior to these.
  • the lubricant according to the invention can therefore replace the graphite-containing lubricants previously used in continuous processes or push bench processes, and at the same time save costs, waste disposal costs and work safety measures.
  • the lubricant according to the invention preferably contains no more than 5% by weight of boron-containing compounds, particularly preferably no boron-containing compounds such as boric acid, borax, boric acid salts or borate-containing minerals, which are frequently used in known lubricants for the hot forming of metals.
  • the lubricant according to the invention can therefore overcome the disadvantages of graphite-based and boron-containing lubricants.
  • the lubricant is sprayed as an aqueous suspension onto the cooled mandrel bar in preparation for the subsequent rolling step, although the mandrel bar is still at a temperature of the order of around 100 °C.
  • An essential aspect for a good lubricating performance of the lubricant is the complete, continuous wetting of the mandrel bar and in particular the thickness of the layer of the lubricant on the wetted mandrel bar.
  • the lubricant according to the invention is characterized by good adhesion to the mandrel bar and good and uniform wetting of the surface of the mandrel bar.
  • the layer thickness or quantity of lubricant required for good lubrication in these processes is the same or even lower than that of the graphite-containing lubricants currently used in these processes.
  • the layer thickness or application rate of the lubricant when reference is made herein to the layer thickness or application rate of the lubricant, this means the amount of solids of the lubricant on a given surface of the tool, ie the mandrel bar, measured in grams of solids of the lubricant per square meter [g/m 2 ].
  • a suitable layer thickness of the lubricant according to the invention is of the order of about 30 to 150 g/m 2 surface area of the mandrel, preferably 50 to 120 g/m 2 , particularly preferably 70 to 100 g/m 2 , depending on the composition of the lubricant.
  • the wetting of the surface of the mandrel bar and the layer thickness can be adjusted by the amount of lubricant suspension sprayed onto the surface of the mandrel bar or the duration of the spraying, as well as by the viscosity and adhesion of the suspension. It has been shown that the same or better lubricating effect can be achieved with the lubricant according to the invention compared to commercially available graphite-containing lubricants for the same purpose with the same or even smaller layer thickness or use quantity. In this way, considerable costs can be saved in the production of seamless tubes compared to the currently used graphite-containing lubricants.
  • An essential feature of the lubricant according to the invention is the proportion of solid lubricant which is a mixture of talc and potassium mica and the ratio of talc to potassium mica is at least 2.0 and does not exceed 5.0.
  • the ratio of talc to potassium mica in the solid lubricant is 2.5 to 4.5, preferably 3.0 to 4.0, particularly preferably 3.3 to 3.8.
  • Talc which according to the invention is one of the main components of the solid lubricant in the lubricant according to the invention, is the powdered form of the mineral talc, a sheet silicate (phyllosilicate), more precisely magnesium silicate hydrate. Depending on the modification, it crystallizes as talc-1A in the triclinic crystal system or as talc-2M in the monoclinic crystal system.
  • Potassium micas which according to the invention form the other main component of the solid lubricant in the lubricant according to the invention but are contained in a smaller amount than talc, are also layered silicates (phyllosilicates), which, however, have a potassium ion.
  • the potassium mica in the solid lubricant of the lubricant according to the invention therefore contains at least 60% by weight phlogopite, preferably at least 80% by weight phlogopite, particularly preferably at least 90% by weight phlogopite. Only phlogopite is very particularly preferably used as the potassium mica.
  • the lubricant according to the invention is sprayed onto the mandrel bar and possibly also the hollow block as a suspension of the solids in water during the hot forming of metals, in particular for lubricating the mandrel bar and/or the hollow block in the production of seamless pipes.
  • the lubricant according to the invention also contains 10 to 30% by weight of an adhesive and 2 to 10% by weight of a thickener.
  • Ethylene-vinyl acetate copolymer (EVA) has proven particularly advantageous as an adhesive and xanthan gum as a thickener.
  • EVA Ethylene-vinyl acetate copolymer
  • other suitable adhesives and thickeners as noted herein may also be employed.
  • the lubricant according to the invention also contains 0 to 10% by weight of other auxiliaries which can be used advantageously in lubricants of the type mentioned here, depending on the application.
  • Such adjuvants preferably include defoamers, dispersants and biocides.
  • Defoamers are intended to prevent or at least reduce disadvantageous foam formation when the lubricant suspension is sprayed onto the tool, for example the mandrel bar.
  • Suitable defoamers include polyglycols, amorphous and/or hydrophobic silica, polysiloxanes, dimethylpolysiloxanes, organically modified polysiloxanes and naphthalene condensates.
  • Dispersants can be used to advantage in order to improve the distribution of the solids in the lubricant in the aqueous suspension and to prevent or slow down the sedimentation of the solids in the suspension.
  • Suitable dispersants include C16-C18 alcohols, ethoxylate salts, sodium and potassium tripolyphosphates, polyethylene glycol and sodium silicate.
  • Biocides can be used to advantage in order to prevent or at least reduce the proliferation of microorganisms, such as bacteria, fungi and/or yeasts, in the lubricant, in particular when the lubricant is stored for a longer period of time.
  • Suitable biocides include 1,2-benziso-thiazol-3(2H)-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-2H-isothiazol-3-one, 2-octyl- 2H-isothiazol-3-one, ethylenedioxydimethanol, tetrahydro-1,3,4,6-tetrakis(hydroxymethyl)imidazo[4,5-d]imidazole-2,5(1H,3H)-dione, 2-bromo-2 -nitropropane-1,3-diol, 2,2-dibromo-2-carbamoylacetonitrile, sodium hypochlorite and sodium chlorite.
  • a particular advantage of the lubricant according to the invention is that it can replace graphite-based lubricants currently used in continuous processes and push-bench processes for the production of seamless pipes and can thus overcome the disadvantages of using graphite. Nevertheless, graphite is an excellent lubricant and, due to its heat resistance, is particularly suitable for hot metal forming. The graphite-based lubricants previously used for these applications therefore regularly contain high proportions of graphite.
  • the lubricant according to the invention is intended to overcome the disadvantages of graphite-containing lubricants and to replace them, it can be advantageous in embodiments of the lubricant according to the invention to add a certain proportion of graphite in order to adjust and further improve the properties of the lubricant.
  • the proportion of graphite in the lubricant must not exceed 10% by weight of graphite, preferably not more than 5 % by weight of graphite.
  • such a proportion of graphite in the lubricant according to the invention is significantly lower than the high graphite proportion in previously used graphite-containing lubricants and is therefore not associated with the disadvantages of graphite to the known extent.
  • the lubricant according to the invention particularly preferably contains no graphite.
  • the invention also includes the use of the lubricant composition according to the invention for lubricating the mandrel bar and/or the hollow block in the production of seamless tubes by hot metal forming, preferably in the continuous process or push bench process.
  • the lubricant is sprayed onto the mandrel bar, which has a temperature of approx. 100 °C, before it is inserted into the hollow block.
  • the lubricant according to the invention is sprayed on in a layer thickness (amount used) of 30 to 150 g/m 2 surface of the mandrel bar.
  • the layer thickness (amount used) is preferably 50 to 120 g/m 2 sprayed surface, particularly preferably 70 to 100 g/m 2 sprayed surface.
  • Viscosity measurements were carried out using a Brookfield R/S Plus rotational rheometer (AME-TEK GmbH - Brookfield BU, Lorch, Germany) with a coaxial cylinder (40 mm spindle) in accordance with DIN 53019 and in accordance with the manufacturer's instructions and using the Rheo3000 software at a sample temperature of 20°C +/- 0.4°C.
  • the tribometer consists of an inductively heatable, rotating disc made of Thermudur 2342 EFS steel with a diameter of 280 mm and a table that can be moved hydraulically in the direction of the rotating disc, on which a test specimen made of S355MC steel that can be heated by means of resistance heating is mounted.
  • the rotating disk was heated to 100 °C ( ⁇ 10 °C) and sprayed with the lubricant in the desired layer thickness.
  • the distance between the spray nozzle and the pane surface was 10 mm.
  • the lubricant was applied in a layer thickness of 80 g/m 2 and left to act for about 5 seconds before the measurement.
  • the disk was rotated at 10 rpm.
  • the test specimen was heated to 1230 °C ( ⁇ 20 °C), pressed against the rotating disc by means of the hydraulically movable table with a contact force (F N ) of 32,000 N ( ⁇ 2,000 N) and the radial force acting on the disc perpendicular to the contact force (F R ) measured over a period of several seconds.
  • Six measurements were carried out on each sample (6-fold determination). The mean value of the recorded friction values in the period of 2 to 6 seconds after the contact of the workpiece with the rotating disk was considered as the friction value of a measurement. Again, the coefficient of friction reported herein is the average of the six measurements made on each sample.
  • the layer thickness of a lubricant applied to the disk of the tribometer under the spray conditions was checked by applying a magnetic tape film to the surface of the disk before spraying the lubricant and then spraying the lubricant on.
  • the magnetic tape foil was removed, weighed with the lubricant applied to it, and the layer thickness was determined from the difference to the weight of the non-lubricated foil.
  • the comparison lubricant used was the graphite-based mandrel rod lubricant PHOS-PHATHERM ® 120 GLW 30 (hereinafter "PH120”) from Chemische Fabrik Budenheim KG, which is used industrially in the continuous process for the manufacture of seamless pipes and is available as a 30% suspension.
  • PH120 graphite-based mandrel rod lubricant
  • figure 1 shows the coefficients of friction of the compositions examined.
  • Formulation A showed similar results as Formulation G with talc alone.
  • Recipe H in which mica muscovite (muscovite 1) was used instead of phlogopite compared to recipe F, showed significantly poorer results than recipe F with phlogopite alone.
  • figure 2 shows the coefficients of friction of the compositions examined.
  • the ratio of talcum to phlogopite in the range from 3.3 to 3.8 which has proven to be particularly advantageous with regard to the achievable coefficient of friction
  • about 13% talcum plus phlogopite (recipes S and T) good coefficients of friction were comparable to those of 19 .5% talc plus phlogopite (recipes C and D) achieved.
  • the coefficients of friction were higher, but still well below the reference recipe PH120 with the graphite-based product according to the prior art.
  • figure 3 shows the coefficients of friction of the compositions examined.
  • Formulations L and M alternative mica Muscovite 1 and Muscovite 2 were compared with Phlogopite in Formulation C and with the same use of pure graphite instead of talc plus mica in Formulation I. While the best coefficients of friction were achieved with the same quantity used with phlogopite (recipe C), the mica muscovite 1 and muscovite 2 (recipes L and M) also showed good coefficients of friction, which are only slightly above the use of the same total quantity of pure graphite instead of talc plus mica (Recipe I) were.
  • figure 4 shows the coefficients of friction of PH120 and composition C with different layer thicknesses.
  • the comparison of different layer thicknesses of recipe C with the comparison lubricant PH120 shows again that the recipe C according to the invention even with the lowest
  • the amount used with a layer thickness of only 30 g/m 2 still provides better, or at least comparable, friction values compared to the comparison lubricant PH120 when used twice or more than three times as much.
  • Composition "C” used in the foregoing comparisons contains 25% (w/w) solids and 75% water.
  • higher dilutions of the same solids composition were produced with a lower solids content and friction coefficient measurements were carried out as above (20% to 10% solids content; hereinafter “C20”, “e17.5", ... “C10”)).
  • C20 % to 10% solids content
  • C10 friction coefficient measurements

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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)

Claims (11)

  1. Lubrifiant pour formage à chaud de métaux, en particulier pour lubrifier la tige de mandrin et/ou le bloc creux lors de la fabrication de tubes sans soudure, caractérisé en ce que le lubrifiant contient au moins les composants suivants, sur la base de la proportion des matières solides :
    - 55 à 85 % en poids d'un agent lubrifiant solide constitué d'un mélange de talc et d'un mica de potassium, le rapport entre le talc et le mica de potassium dans l'agent lubrifiant solide allant de 2,0 à 5,0,
    - 10 à 30 % en poids d'un adhésif choisi parmi l'acétate de polyvinyle, un silicate de sodium ou un mélange de ceux-ci,
    - 2 à 10 % en poids d'un épaississant choisi parmi l'hydroxycellulose, l'hydroxyéthylcellulose, l'hydroxypropylcellulose, la carboxyméthylcellulose, la méthylcellulose, l'éthylcellulose, la méthyléthylcellulose, l'hydroxyéthylméthylcellulose, l'hydroxypropylméthylcellulose, l'éthylhydroxyméthylcellulose, la carboxyméthylhydroxycellulose, la dextrine, l'amidon, la bentonite modifiée sur le plan organique, la smectite et la gomme xanthane,
    - 0 à 10 % en poids d'excipients supplémentaires, de préférence choisis parmi un agent antimousse, un agent dispersant et un biocide, et
    - pas plus de 10 % en poids de graphite, de préférence pas plus de 5 % en poids de graphite, de manière particulièrement préférée pas de graphite.
  2. Lubrifiant selon la revendication 1, caractérisé en ce que le rapport entre le talc et le mica de potassium dans l'agent lubrifiant solide est de 2,5 à 4,5, de préférence de 3,0 à 4,0, de manière particulièrement préférée de 3,3 à 3,8.
  3. Lubrifiant selon l'une des revendications 1 ou 2, caractérisé en ce que le mica de potassium est choisi parmi le phlogopite, la muscovite et un mélange des deux.
  4. Lubrifiant selon l'une des revendications 1 à 3, caractérisé en ce que le mica de potassium contient au moins 60 % en poids de phlogopite, de préférence au moins 80 % en poids de phlogopite, de manière particulièrement préférée au moins 90 % en poids de phlogopite, de manière tout particulièrement préférée 100 % en poids de phlogopite.
  5. Lubrifiant selon l'une des revendications 1 à 4, caractérisé en ce que le lubrifiant est une suspension aqueuse contenant 10 à 45 % en poids de matières solides, de préférence 15 à 35 % en poids de matières solides, de manière particulièrement préférée 20 à 30 % en poids de matières solides.
  6. Lubrifiant selon l'une des revendications 1 à 5, caractérisé en ce que l'adhésif comprend ou est un copolymère d'éthylène-acétate de vinyle (EVA).
  7. Lubrifiant selon l'une des revendications 1 à 6, caractérisé en ce que l'épaississant comprend ou est de la gomme xanthane.
  8. Lubrifiant selon l'une des revendications 1 à 7, caractérisé en ce que le lubrifiant contient le reste des composants sous la forme d'excipients supplémentaires, de manière préférée choisis parmi un agent antimousse, un agent dispersant et un biocide.
  9. Lubrifiant selon l'une des revendications 1 à 8, caractérisé en ce que le lubrifiant contient 0 à 5 % en poids de composés contenant du bore, de préférence 0 à 2,5 % en poids de composés contenant du bore, de manière particulièrement préférée 0 à 1 % en poids de composés contenant du bore, et de manière tout particulièrement préférée ne contient aucun composé contenant du bore.
  10. Utilisation d'une composition de lubrifiant selon l'une des revendications 1 à 9 pour lubrifier la tige de mandrin et/ou le bloc creux dans la fabrication de tubes sans soudure par formage à chaud de métaux, de préférence dans le cadre d'un procédé continu ou d'un procédé du banc-poussant.
  11. Utilisation selon la revendication 10, caractérisée en ce que le lubrifiant est pulvérisé sous forme de suspension aqueuse sur la tige de mandrin et/ou le bloc creux, en une quantité de 30 à 150 g/m2 de surface, de préférence en une quantité de 50 à 120 g/m2 de surface pulvérisée, de manière particulièrement préférée en une quantité de 70 à 100 g/m2 de surface pulvérisée, de manière tout particulièrement préférée en une quantité d'environ 80 g/m2 de surface pulvérisée.
EP20706258.9A 2019-02-22 2020-02-21 Lubrifiant pour la transformation chaude de métaux Active EP3927797B1 (fr)

Applications Claiming Priority (2)

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DE102019104540.1A DE102019104540B4 (de) 2019-02-22 2019-02-22 Schmierstoff und dessen Verwendung für die Heißumformung von Metallen
PCT/EP2020/054621 WO2020169800A1 (fr) 2019-02-22 2020-02-21 Lubrifiant pour le façonnage à chaud de métaux

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EP3927797B1 true EP3927797B1 (fr) 2022-12-28

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EP (1) EP3927797B1 (fr)
JP (1) JP2022521134A (fr)
KR (1) KR20210127136A (fr)
CN (1) CN113474442B (fr)
CA (1) CA3119484C (fr)
DE (1) DE102019104540B4 (fr)
EA (1) EA202192274A1 (fr)
SA (1) SA521430126B1 (fr)
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CN113444565A (zh) * 2021-07-26 2021-09-28 湖南金裕环保科技有限公司 一种高温水基芯棒润滑剂、制备方法及其应用

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DE102019104540A1 (de) 2020-08-27
EA202192274A1 (ru) 2022-01-14
WO2020169800A1 (fr) 2020-08-27
JP2022521134A (ja) 2022-04-06
KR20210127136A (ko) 2021-10-21
CN113474442B (zh) 2022-11-29
EP3927797A1 (fr) 2021-12-29
US11485929B2 (en) 2022-11-01
CA3119484C (fr) 2023-09-19
CN113474442A (zh) 2021-10-01
BR112021009900A2 (pt) 2021-09-08
DE102019104540B4 (de) 2021-08-19
SA521430126B1 (ar) 2023-11-30
US20220162517A1 (en) 2022-05-26
CA3119484A1 (fr) 2020-08-27

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