EP3705556A1 - Lubrifiant de formage de métaux, en particulier de formage d'acier, et procédé de fabrication de lubrifiant de formage - Google Patents

Lubrifiant de formage de métaux, en particulier de formage d'acier, et procédé de fabrication de lubrifiant de formage Download PDF

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Publication number
EP3705556A1
EP3705556A1 EP20160069.9A EP20160069A EP3705556A1 EP 3705556 A1 EP3705556 A1 EP 3705556A1 EP 20160069 A EP20160069 A EP 20160069A EP 3705556 A1 EP3705556 A1 EP 3705556A1
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EP
European Patent Office
Prior art keywords
forming
forming lubricant
mineral
weight
lubricant
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
EP20160069.9A
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German (de)
English (en)
Inventor
Patrick Frank
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Saarstahl AG
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Saarstahl AG
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Filing date
Publication date
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Publication of EP3705556A1 publication Critical patent/EP3705556A1/fr
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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
    • C10M113/00—Lubricating compositions characterised by the thickening agent being an inorganic material
    • C10M113/10—Clays; Micas
    • 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
    • C10M113/00—Lubricating compositions characterised by the thickening agent being an inorganic material
    • C10M113/12—Silica
    • 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
    • C10M2201/1033—Clays; Mica; Zeolites 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
    • 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
    • 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
    • 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
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • 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
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
    • 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
    • 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
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/023—Multi-layer lubricant coatings

Definitions

  • the invention relates to a lubricant for metal forming, in particular for forming steel.
  • the invention also relates to a method for producing the forming lubricant and a metal body coated with the forming lubricant.
  • the workpieces can heat up to temperatures> 400 ° C. In many cases, such heating is desirable since the strength of the shaped bodies to be reshaped can be reduced at higher temperatures.
  • the previously known lubricants for example soaps or waxes, are used for forming at the higher temperatures lose required properties. The load-bearing capacity collapses abruptly when temperatures are reached during forming that are in the range of the melting point of the forming lubricant.
  • the invention is based on the object of creating a forming lubricant which is suitable for cold forming and which can be used at higher temperatures than the known forming lubricants.
  • the forming lubricant contains at least one mineral which has a layer structure and an agent for modifying the layer structure.
  • the layer structure By modifying the layer structure, in particular by swelling, delamination and / or exfoliation, it is possible to produce a comparatively large number of individual, mutually displaceable layer layers in the mineral and thereby to provide the forming lubricant with exceptionally good lubricity. Due to the temperature resistance and pressure stability of the mineral, the forming lubricant is also stable at temperatures> 400 ° C, has good coefficients of friction there and can therefore be used for both cold and Lau hot forming.
  • the mineral is a sheet silicate, preferably kaolin or a mineral of the mica group.
  • the sheet silicates of the smectite group, the pyrophyllite group, the vermiculite group and the mica group have proven to be particularly suitable.
  • Layered silicates are also known as leaf silicates or phyllosilicates.
  • the minerals, in particular the phyllosilicates are particles which are built up from a multi-layer arrangement (stack) of individual mineral flakes and / or layers, in particular silicate flakes and / or layers. These individual mineral flakes and / or layers are like Fig. 1 shows, each connected to one another by ionic interactions.
  • Ions are arranged between the mineral platelets, which can be exchanged through a suitable chemical treatment.
  • intercalation the distances between the mineral platelets can be increased ("sources") and / or, as in FIG Fig. 2 is shown, individual mineral platelets are completely detached and rearranged.
  • the detachment of the mineral flakes is called delamination. Exfoliation is when stacks of the mineral flakes have been delaminated, preferably at least in a proportion of> 30%, particularly preferably 50%.
  • the mineral in particular the sheet silicate, is expediently produced synthetically or obtained from natural resources. It can advantageously be formed from naturally occurring weathering products that are found, for example, as components of various clay minerals.
  • the mean particle size of the mineral is expediently 0-30 ⁇ m, preferably with a mean particle size ⁇ 15 ⁇ m. Particle sizes between 0.1 ⁇ m and 5 ⁇ m have proven to be particularly advantageous for the formation of the forming lubricant.
  • the phyllosilicates mentioned are compounds of the oxides, the hydroxides and / or the hydrates of aluminum and / or magnesium with silica, it being possible for aluminum and magnesium in these compounds to replace one another wholly or in part.
  • Such layered silicates can be described with the following basic formula: xAl 2 O 3 • yMgO • zSiO 2 • nH 2 O
  • sheet silicates that are particularly suitable for producing the forming lubricant are: Kaolinite Al 4 [(OH) 8
  • the modifying agent is or contains a surfactant, which preferably comprises a soap and / or an amine.
  • the surfactant is expediently a water-soluble soap, preferably an alkali or alkaline earth salt of a fatty acid, which preferably has a chain length of at least ten carbon atoms.
  • the modification in particular the swelling, the delamination and / or the exfoliation, means that the layers of the mineral are covered with fatty acids or other long-chain carboxylic acids (C C10). Salts of palmitic acid (hexadecanoic acid, C16) or stearic acid (octadecanoic acid, C18), for example, are well suited and inexpensive.
  • the soaps are at least in part soaps of divalent metals.
  • Soaps made from magnesium, calcium and / or zinc are suitable, for example.
  • the forming lubricant could also contain soaps of other divalent metal ions such as Sr 2+ , Ba 2+ , Pb 2+ , Cd 2+ .
  • the forming lubricant has a metal soap, preferably calcium and / or magnesium stearate, and at least one stearate of monoethanolamine, triethanolamine, isopropanolamine and / and isobutanolamine (2-amino-2-methyl-1-propanol) .
  • a metal soap preferably calcium and / or magnesium stearate, and at least one stearate of monoethanolamine, triethanolamine, isopropanolamine and / and isobutanolamine (2-amino-2-methyl-1-propanol) .
  • Unreacted, in particular unbridged, stearate residues remaining in the coating can react with any amine residues that may still be present with the formation of amides during subsequent drying (> 100 ° C.).
  • the amides show higher melting points than the originally present, unreacted stearate components.
  • the metal soap also acts as a lubricant, the lubricating function of which is caused in particular by
  • the forming lubricant comprises at least one polymeric film former, which is preferably in the form of a solution or a dispersion.
  • the film former serves to give the forming lubricant such chemical and / or physical properties that it forms a film with the formation of a coating on the metal. This is achieved, among other things, because chemical bonds are formed at the phase boundary with the metal.
  • the film former is expediently formed by at least one water-soluble and / or dispersible polymer that can be derived from the monomers of the vinyl group, in particular by at least one polymer or copolymer of at least one ethylene, one vinyl alcohol, one styrene and / or one acrylic acid in the form of the free acid Alkyl or their alkylene esters.
  • the film former is preferably in the form of a microdispersion. It is particularly suitable for binding the forming lubricant to a, preferably phosphated, steel surface.
  • the polymer dispersion expediently contains a polyethylene-acrylic copolymer and / or, in order to increase the hardness of the forming lubricant, if it is arranged on the iron material, in particular steel, an acrylate.
  • the acrylate can be present in unesterified, partially or completely esterified form, for example as methyl-ethyl, propyl and / or (iso-) butyl esters. It has proven to be particularly advantageous to provide the polyethylene-acrylic copolymer as a mixture with an acrylate dispersion, since this results in an additional interaction and thus stabilization with swollen, delaminated and / or exfoliated mineral flakes.
  • the acrylate can be used to influence the adhesion and hardness of a layer formed by the forming lubricant on the iron material at a low temperature ("initial hardness").
  • initial hardness can be achieved, for example, by adding a styrene-acrylic copolymer.
  • a high final hardness or toughness can be achieved, for example, by adding an acrylic-butadiene copolymer, which tends to cross-link at higher temperatures.
  • a similar effect can be achieved with other crosslinkable acrylic derivatives or copolymers which, for example, have a propylene, butylene or isobutylene component.
  • the film former which preferably bears carboxyl groups, can be in ionic and / or non-ionic form. It can be adjusted by means of alkali hydroxide and / or at least one amine.
  • the ionic film formers have ammonia and / or a, preferably volatile, amine as counterion.
  • the amine used is preferably at least one short-chain alkyl or alkanol derivative of ammonia with a maximum of four linear carbon units (C4).
  • Monoethanolamine, triethanolamine, isopropanolamine and / or isobutanolamine have proven particularly suitable for this.
  • the forming lubricant contains a powder made of polymer which has a particularly high hardness and / or a particularly high molecular weight (M .000 1,000,000).
  • the polymer is incorporated into the coating film formed on the metal by the forming lubricant and has an advantageous effect particularly at low to medium temperatures of 400 400 ° C.
  • a powder, preferably micro-powder, of various non-aromatic substituted polyamides, such as polyamide 6, polyamide 66 or even polyamide 12, is suitable for achieving a high level of hardness.
  • aromatically substituted polyamides can be used have higher melting points and / or temperature resistance.
  • the preferred particle size of the micropowders is approx. 0-30 ⁇ m, with a particle size of 0.1 to max. 10 ⁇ m is particularly preferred.
  • the particle size of the powder is expediently. 0-30 ⁇ m, the particle size from 0.1 to max. 15 ⁇ m is preferable.
  • the forming lubricant contains an agent for its preservation, preferably a biocide, a foam inhibitor and / or an agent for stabilizing, in particular against sedimentation, of constituents of the forming lubricant.
  • agent for its preservation preferably a biocide, a foam inhibitor and / or an agent for stabilizing, in particular against sedimentation, of constituents of the forming lubricant.
  • Isothiazolinone derivatives, methylisothiazolinone (MIT), chloromethylisothiazolinone (CMIT) and / or benzisothiazolinone (BIT) are suitable as biocides.
  • the foam inhibitor is preferably formed by polyether-modified siloxanes or polydimethylsiloxanes.
  • the forming lubricant can contain alkyl or alkanol ammonium salts of long-chain acrylic acid derivatives as stabilizers.
  • the forming lubricant is present as a coating on the metal body.
  • the forming lubricant has the mineral in a proportion of 2 to 70% by weight, preferably 10 to 50% by weight, particularly preferably 20 to 40% by weight. It expediently contains the modifying agent in a proportion of 5 to 50% by weight, preferably 10 to 35% by weight, particularly preferably 15 to 25% by weight.
  • the forming lubricant has the film former in a proportion of 10 to 60% by weight, preferably 15 to 50% by weight, particularly preferably 20 to 45% by weight.
  • the film former is expediently formed with a weight fraction of at least 1/4 from polyacrylate, with a weight fraction of at least 1/4 from polyethylene-acrylic copolymer and / or with a weight fraction of at least 1/4 from polyamide.
  • the quotient of the proportions by weight of the mineral, in particular the sheet silicate, and the modifier, in particular the metal soap, is expediently between 0.2: 1 and 1.8: 1, preferably between 0.4: 1 and 0.8: 1 .
  • the forming lubricant advantageously contains the powder mentioned in a proportion of 0-50% by weight, preferably 5 to 40% by weight, particularly preferably 10 to 30% by weight.
  • the forming lubricant is packaged as a liquid coating agent, which is provided for arrangement on the body made of metal, preferably for forming a coating on the body, and is preferably a dispersion of the forming lubricant.
  • The, preferably liquid, coating agent contains the forming lubricant expediently in a concentration of 2 to 70% by weight, preferably 5 to 60% by weight.
  • the continuous phase of the coating agent is expediently formed by an aqueous liquid, preferably water, or an organic liquid. It has proven to be advantageous to provide the coating agent with a forming lubricant concentration of 2 to 10% by weight, preferably 4 to 8% by weight, if the metal is to be sprayed with the coating agent or dipped into the coating agent.
  • the coating agent expediently has a pH of 8.4 to 10.5, particularly preferably 8.7 to 9.5. If the metal is coated with the forming lubricant while the metal is being drawn in a drawing die, it has proven advantageous to provide the coating agent in a forming lubricant concentration of at least 10% by weight, preferably at least 15% by weight. In this case, the coating agent expediently has a pH of 10.0-13.0 and particularly preferably 10.5-11.5.
  • the metallic body is expediently immersed in a bath of the coating agent, in particular the aqueous solution, in order to form the forming lubricant as a coating on it.
  • the metallic body can be sprayed or misted with the coating agent, in particular the aqueous solution.
  • the forming lubricant according to the invention can be applied directly to the metal, in particular the steel. If the forming lubricant is applied directly to a preferably bare, ie uncoated, metallic surface, it has proven to be advantageous to clean the surface using a preferably spherical blasting agent, for example abrasive grains, before applying the forming lubricant.
  • the workpieces in question are previously phosphated in a commonly used zinc, calcium, magnesium or / and manganese-containing phosphating solution, a phosphate layer of 6-10 g / m 2 being particularly preferred.
  • the workpieces phosphated in this way are then dipped into the aqueous dispersion of the coating according to the invention. After drying in the air or in a dryer, a tightly adhering and water-resistant, thin film remains.
  • the film is formed with a coverage of at least 0.25 g / m 2 .
  • Particularly good forming results can be achieved with a film coverage of 0.5-2.5 g / m 2 , preferably 1.0-2.0 g / m 2 .
  • a mixture is made from 500 ml of water and 500 g of kaolin and / or sand-free, powdery clay.
  • the pH of the mixture is adjusted to pH 11 using ethanolamine and the mixture is stirred at room temperature for at least 24 hours.
  • the mixture is kneaded and / or stirred for a further 24 hours at room temperature or at a temperature between 50-75 ° C.
  • the pH of a commercially available calcium stearate dispersion which is stabilized by means of an anionic or nonionic surfactant mixture, is adjusted to ⁇ 11 by adding ethanolamine and a sand-free, powdery clay is stirred into the calcium stearate dispersion.
  • the dispersion is kneaded or stirred at room temperature or at a temperature between 50 and 75 ° C. for 12 hours.
  • a surface-modified sheet silicate is formed that can be used to produce a forming lubricant, as in the examples explained below.
  • An aqueous agent for forming a coating from the forming lubricant which has the following composition in% by weight: Surface-modified layered silicate (kaolin / clay) 1.5% Polyacrylate (as an aqueous dispersion) 1.0% Ethylene-Acryl-Co-Polymer (as an aqueous dispersion) 1.0% Calcium stearate 1.5%
  • the pH value is adjusted to 8.7 - 9.5 with the aid of ethanolamine, the total solids content or the working concentration is 5.0%.
  • the coating agent is filled into a tub which is suitable for holding phosphated steel wire wound in a ring shape.
  • the coating agent is heated to 50 ° C.
  • a ring to be coated can have a bare metal or a phosphated surface.
  • the bare metal surface can be cleaned using abrasive grains before the forming lubricant is applied.
  • the steel wire is dipped into the coating agent, then removed again and excess coating agent is allowed to drip off. It is then dried in the ambient air or preferably in a dryer at preferably 100 100 ° C.
  • the forming lubricant is now formed in the form of a coating on the steel wire.
  • a coating formed on a previously phosphated steel surface is shown schematically in cross section in Fig. 5 shown. Exfoliated and with stearate modified phyllosilicate platelets 1 are embedded in a polymer matrix 2 over the phosphate layer 3 of the steel 4.
  • the phosphate layer 3 is missing and the matrix 2 with the layered silicate platelets is arranged directly on the steel 4.
  • the forming lubricant formed on the wire has 30% by weight of sheet silicate, 30% by weight of calcium stearate, 20% by weight of polyacrylate and 20% by weight of ethylene-acrylic co-polymer.
  • the coating composition according to the invention of the 1st example is sprayed onto the ring of the 1st example by means of a shower in such a way that its surface is completely wetted.
  • the excess coating agent is allowed to drain off.
  • the workpieces or the rings are dried as in the 1st example.
  • An aqueous coating agent of the following composition in% by weight is formed, to which a polymeric micropowder is added.
  • Surface-modified layered silicate (kaolin / clay) 3.0% Polyacrylate (as an aqueous dispersion) 2.0% Ethylene-Acryl-Co-Polymer (as an aqueous dispersion) 2.0% Calcium stearate (as an aqueous dispersion) 1.5%
  • Polyamide (as micro powder) 1.5%
  • the pH value of the coating agent is adjusted to pH 8.7-9.5 with the aid of isobutylamine, the active concentration (total solids content) is 10.0%.
  • the coating agent is heated to 65 ° C. and a wire wound into rings is coated as in Example 1 or Example 2.
  • the wire can be processed either immediately afterwards or at a later point in time on a multi-stage press.
  • the forming lubricant according to this example is particularly suitable for multi-stage production for medium to high temperatures and for high pressing pressures.
  • the forming lubricant formed on the wire has 30% by weight of sheet silicate, 15% by weight of calcium stearate, 15% by weight of polyamide, 20% by weight of polyacrylate and 20% by weight of ethylene-acrylic co-polymer.
  • a coating agent concentrate is formed with the following composition in% by weight, from which the coating agent according to the invention listed in the 1st example can be produced by dilution.
  • Surface-modified layered silicate kaolin / clay
  • Polyacrylate as an aqueous dispersion
  • Polyethylene-Acryl-Co-Polymer as an aqueous dispersion
  • Calcium stearate as an aqueous dispersion
  • the coating agent concentrate has a total solids content of 40%, a solids content of 30-50% having proven to be particularly favorable with regard to space-saving storage and good applicability.
  • the pH of the coating concentrate is 10.5-11.0 and is adjusted using a mixture of ethanolamine and isobutylamine. 7 parts of water are added to each part of the coating concentrate. The solids content of 5.0% given for Example 1 is obtained in this way.
  • the pH value is checked and, if necessary, corrected to pH 8.7-9.5 with the aid of ethanolamine.
  • the coating and drying are carried out as in the 1st example.
  • the forming lubricant formed on the wire has 30% by weight of sheet silicate, 30% by weight of calcium stearate, 20% by weight of polyacrylate and 20% by weight of ethylene-acrylic co-polymer.
  • a coating agent concentrate with a solids content of 40% is prepared, to which a polymeric micropowder with a comparatively large molecular weight has also been added (data in% by weight).
  • Surface-modified layered silicate kaolin / clay
  • Polyacrylate as an aqueous dispersion
  • Acrylic-styrene-co-polymer as an aqueous dispersion
  • Calcium stearate 8.0% UHMW polyethylene micro powder 6.0%
  • the pH of the coating concentrate is adjusted to 10.5-11.0 using a mixture of ethanolamine and isobutylamine. Other additives added are a preservative and a silane-based anti-setting with max. 0.5% (based on the concentrate). 4 parts of water are added to each part of the coating concentrate. The pH value is checked and adjusted to pH 8.7-9.5 with the aid of ethanolamine. The result is a solids content of 8% or the following composition in% by weight.
  • the coating and drying are carried out as described above for the 1st example, this composition being particularly well suited for preheating in an oven (Lau warm forming) and for forming processes in which particularly high pressure is used.
  • aqueous coating agent of the following composition in% by weight is formed, to which a polymeric micropowder and a stearic acid amide have been added.
  • Surface-modified layered silicate kaolin / clay
  • Polyacrylate as an aqueous dispersion
  • Polyethylene-Acryl-Co-Polymer as an aqueous dispersion
  • Calcium stearate 1.0% Distearyl ethylenediamide 1.8% UHMW polyethylene micro powder 0.6%
  • the solids content of the coating is 6%.
  • the adjustment of the pH, coating and drying are carried out as described for the 1st example.
  • the coating has good sliding properties and enables good forming results. At low and medium temperatures, the required pressing pressures can be significantly reduced.
  • test specimens previously phosphated and provided with the coating according to the invention (material: 23MnB4, as-rolled) were reduced over a length of 100 mm from 18 mm to 15 mm.
  • oil / drawing grease, sodium stearate (reactive soap) and a commercially available polymer-wax forming lubricant were tested as comparative forming lubricants. How Fig.
  • the forming forces measured when using the forming lubricant according to the invention according to the 1st example are about 30% lower than a drawing fat, are about 20% lower than those when using the sodium stearate, and by at least 10% lower than when using the polymer wax forming lubricant, which is commercially available.
  • Possible manufacturing processes extend to different applications in the area of cold and / or Lau-hot forming, or in particular to: Pulling from: Wire, tubes, hollow or solid profiles Rolling or deep drawing of: Tape and sheet metal Extrusion, upsetting of: Wire or rod sections to: Bolts, screws, nuts as well as more complex ones Components such as steering columns, gears, etc.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
EP20160069.9A 2019-03-04 2020-02-28 Lubrifiant de formage de métaux, en particulier de formage d'acier, et procédé de fabrication de lubrifiant de formage Pending EP3705556A1 (fr)

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Application Number Priority Date Filing Date Title
DE102019105336.6A DE102019105336A1 (de) 2019-03-04 2019-03-04 Schmierstoff zur Metallumformung, insbesondere zur Umformung von Stahl, und Verfahren zur Herstellung des Umformschmierstoffs

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EP3705556A1 true EP3705556A1 (fr) 2020-09-09

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1322838A (en) * 1970-08-15 1973-07-11 Pyrene Chemical Services Ltd Lubricant compositions
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WO2012086564A1 (fr) * 2010-12-20 2012-06-28 日本パーカライジング株式会社 Lubrifiant de traitement plastique d'un matériau métallique
CN107502420A (zh) * 2017-07-04 2017-12-22 当涂县宏宇金属炉料有限责任公司 一种适用于再生金属加工的拉丝粉

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JP2016216536A (ja) * 2015-05-15 2016-12-22 日本パーカライジング株式会社 水性潤滑剤、金属材料及び金属加工品

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GB1322838A (en) * 1970-08-15 1973-07-11 Pyrene Chemical Services Ltd Lubricant compositions
US6194357B1 (en) * 1996-06-21 2001-02-27 Henkel Corporation Waterborne lubricant for the cold plastic working of metals
WO2012086564A1 (fr) * 2010-12-20 2012-06-28 日本パーカライジング株式会社 Lubrifiant de traitement plastique d'un matériau métallique
CN107502420A (zh) * 2017-07-04 2017-12-22 当涂县宏宇金属炉料有限责任公司 一种适用于再生金属加工的拉丝粉

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