EP2951258A1 - Procédé de fabrication d'un element composite metal-plastique - Google Patents

Procédé de fabrication d'un element composite metal-plastique

Info

Publication number
EP2951258A1
EP2951258A1 EP14702233.9A EP14702233A EP2951258A1 EP 2951258 A1 EP2951258 A1 EP 2951258A1 EP 14702233 A EP14702233 A EP 14702233A EP 2951258 A1 EP2951258 A1 EP 2951258A1
Authority
EP
European Patent Office
Prior art keywords
metal
plastic
layer
conversion
halides
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.)
Withdrawn
Application number
EP14702233.9A
Other languages
German (de)
English (en)
Inventor
Maximilian Gruhn
Karl Kuhmann
Martin Risthaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Evonik Degussa GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Evonik Degussa GmbH filed Critical Evonik Degussa GmbH
Publication of EP2951258A1 publication Critical patent/EP2951258A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14311Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1671Making multilayered or multicoloured articles with an insert
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/04Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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    • B32B15/08Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
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    • B32B5/22Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • CCHEMISTRY; METALLURGY
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    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/003Polymeric products of isocyanates or isothiocyanates with epoxy compounds having no active hydrogen
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/77Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78Nitrogen
    • C08G18/79Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
    • C08G18/798Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing urethdione groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/80Masked polyisocyanates
    • C08G18/8061Masked polyisocyanates masked with compounds having only one group containing active hydrogen
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J177/00Adhesives based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Adhesives based on derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J177/00Adhesives based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Adhesives based on derivatives of such polymers
    • C09J177/02Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J177/00Adhesives based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Adhesives based on derivatives of such polymers
    • C09J177/06Polyamides derived from polyamines and polycarboxylic acids
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/02Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C2045/1486Details, accessories and auxiliary operations
    • B29C2045/14868Pretreatment of the insert, e.g. etching, cleaning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
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    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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    • CCHEMISTRY; METALLURGY
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Definitions

  • the present invention relates to a method for producing a hybrid component comprising metal and plastic, a coating for hybrid components and their
  • Hybrid components are composites of the two materials metal and plastic. They can be produced by the injection molding process. Hybrid components are components that are used, inter alia, in vehicle construction and in the automotive industry
  • the disadvantage of these hybrid components lies in the lack of or insufficient adhesion between metal and plastic. In this respect, mechanical anchoring of the plastic to the metal has hitherto been carried out.
  • adhesion between metal and plastic can be improved by adhesion promoters.
  • adhesion promoters From EP-A-1808468 and EP-A-2435246 hybrid components are known, wherein metal and plastic are connected by hot melt adhesives as adhesion promoters on copolyamide base, which additionally contain isocyanate and epoxide groups.
  • hot melt adhesives as adhesion promoters on copolyamide base, which additionally contain isocyanate and epoxide groups.
  • Especially in the automotive industry metal substrates are known which
  • Conversion layers include, which are used for surface treatment.
  • the layers are formed, for example, by phosphating or
  • the hybrid components obtainable from the process should have an improved or increased adhesion between metal and plastic compared with the prior art.
  • the hybrid components obtained should meet the requirements of vehicle and aircraft construction as well as the electronics and electrical engineering industry.
  • a good weather resistance, in particular corrosion protection resistance should be given.
  • Metal and plastic of the hybrid component should be materially bonded
  • the method according to the invention comprises the steps a. Pretreatment of the metal surface by applying at least one conversion layer,
  • the primer composition contains at least one copolyamide-based hot melt adhesive.
  • the metal surface is first pretreated over the whole area or partially.
  • the metal can be cleaned before pretreatment or already have metallic protective coatings.
  • the metal cleaning is known in the art.
  • the pretreatment can be done with conversion means.
  • the conversion agents are usually used as aqueous solutions. Conversion agents are commercially available passivants and products for the
  • Conversion treatment in question such as zinc phosphating agents, iron phosphating and phosphoric acid solutions containing titanates or zirconates.
  • Chromating agents are also technically possible, but they are less preferred because of their health-endangering properties.
  • Conversion agents preferably contain halides.
  • halides salt-like, covalent and complex compounds of the halogens fluorine, chlorine, bromine and iodine with more electropositive elements are considered, with salt-like halides, complex halides or mixtures of these halides are preferred.
  • Halogens are salt-like substances of alkali and alkaline earth salts and ammonium salts of hydrohalic acids.
  • halogen ions occur as monodentate anionic ligands.
  • fluorine-containing halides Particularly preferred salt-like fluorine-containing halides are fluoride anions or hydrogen fluoride anions, for example hydrogendifluoride.
  • complex halides preferably subgroup elements, preferably titanium or zirconium, form the central atom.
  • Complex halides are included, for example, hexafluorotitanate anions, hexafluorozirconate anions or
  • the complex halides are preferably in a proportion of 0.2 to 10 wt .-%, preferably 0.5 to 8 wt .-%, based on the total weight of the aqueous
  • Conversion agent solution included. Suitable conversion agents are sold, for example, by the company Henkel, Germany, under the name Granodine.
  • the salt-like halides are preferably contained in a proportion of 10 to 300 ppm, preferably 20 to 200 ppm and particularly preferably 30 to 100 ppm, each based on the total weight of the conversion agent solution.
  • Fluoride-containing solutions containing fluoride and hydrogen difluoride are
  • Grano Toner 38 offered by Henkel.
  • the metal can be immersed in the conversion agent.
  • the conversion agent can be applied by means of spraying, knife coating, rolling, pressing, dipping, rolling, pouring or laminating.
  • Post-passivation can be carried out after the pretreatment. This is understood to mean a passivating rinse with acidic solutions, preference being given to using the abovementioned halides. Furthermore, the conversion layer can be obtained by a
  • the surface to be treated is passed through the oxidizing region of a gas flame into which a silicon-containing substance, the precursor, is metered. This burns and the residue separates as an amorphous silicate as firmly adherent
  • a plasma jet is generated from a working gas or a flame jet is swept out of a fuel gas, wherein at least one precursor material is supplied to the working gas and / or the plasma jet or the fuel gas and / or the flame jet and in the plasma jet or flame jet is reacted, wherein at least one reaction product of at least one of the precursors on the surface and / or deposited on at least one disposed on the surface layer.
  • a plasma jet is generated from a working gas or a flame jet is swept out of a fuel gas, wherein at least one precursor material is supplied to the working gas and / or the plasma jet or the fuel gas and / or the flame jet and in the plasma jet or flame jet is reacted, wherein at least one reaction product of at least one of the precursors on the surface and / or deposited on at least one disposed on the surface layer.
  • the treatment of the surface can be done at atmospheric pressure.
  • optical emissions of the plasma jet or flame jet can be measured by means of a spectrometer, on the basis of which the characteristics of the plasma jet or flame jet are determined.
  • the treatment of the surface may consist in an activation or in a coating of the surface by means of the plasma jet or flame jet.
  • Reflection behavior transmission behavior, refractive index, transparency,
  • Light scattering electrical conductivity, antibacterial behavior, friction, adhesion, hydrophilicity, hydrophobicity, oleophobicity, surface tension, surface energy, anti-corrosive effect, dirt-repellent effect, self-cleaning ability, photocatalytic behavior, anti-stress behavior, wear behavior, chemical resistance, biocidal behavior, biocompatible behavior, electrostatic behavior, electrochromic Activity, photochromic activity, gasochromic activity.
  • the generation of the plasma can be done in a free-jet plasma source.
  • a high-frequency discharge between two concentric electrodes is ignited, which is formed by an introduced gas flow
  • Hollow cathode plasma as Plasmajet from the electrode assembly usually several centimeters in the free space and is led out to be coated surface.
  • the precursor can be introduced both before the excitation in the working gas (direct plasma processing) and then in the already formed plasma or in the vicinity (remote plasma processing).
  • Another possibility of plasma generation is the exploitation of a dielectrically impeded discharge.
  • the precursor is preferably introduced in the gaseous state or as an aerosol into the working gas or the plasma stream.
  • Liquid or solid, in particular pulverulent precursors can also be used, but are preferably converted into the gaseous state before introduction, for example by evaporation.
  • the precursor can first be introduced into a carrier gas, entrained therefrom, and introduced together with it into the working gas or the plasma stream.
  • the deposited layer preferably comprises at least one of silicon, silver, gold, copper, iron, nickel, cobalt, selenium, tin, aluminum, titanium, zinc, zirconium, tantalum, chromium, manganese, molybdenum, tungsten, bismuth, germanium, niobium , Vanadium, gallium, indium, magnesium, calcium, strontium, barium, lithium,
  • the layers contain oxidic or / and nitridic compounds of silicon, titanium, tin, aluminum, zinc, tungsten and zirconium.
  • the precursor used is preferably an organosilicon and / or an organo-titanium compound, for example hexamethyldisiloxane, tetramethylsilane,
  • Tetramethoxysilane, tetraethoxysilane, titanium tetraisopropylate or titanium tetraisobutylate Tetramethoxysilane, tetraethoxysilane, titanium tetraisopropylate or titanium tetraisobutylate.
  • barrier layers can be realized that the
  • air, steam or other gas can be used, for example, oxygen, nitrogen, noble gases, hydrogen, carbon dioxide, gaseous hydrocarbons or a mixture thereof.
  • propane can be used as the fuel gas for the flame treatment, air or oxygen being supplied for combustion.
  • the fuel gas can be premixed with air or oxygen.
  • the mixing ratio between fuel gas and oxygen or air can be used as a parameter based on the determined
  • Characteristics are controlled and / or regulated.
  • the generation of the plasma can take place in a free-jet plasma source or by means of dielectrically impeded discharge.
  • the precursor is preferably introduced in the gaseous state or as an aerosol into the working gas or the plasma stream.
  • Liquid or solid, in particular pulverulent precursors can also be used, but are preferably converted into the gaseous state before introduction, for example by evaporation.
  • the precursor can first be introduced into a carrier gas, entrained therefrom, and introduced together with it into the working gas or the plasma stream.
  • the precursor used is preferably an organosilicon and / or an organo-titanium compound, for example hexamethyldisiloxane, tetramethylsilane,
  • Tetramethoxysilane, tetraethoxysilane, titanium tetraisopropylate or titanium tetraisobutylate Tetramethoxysilane, tetraethoxysilane, titanium tetraisopropylate or titanium tetraisobutylate.
  • the adhesion promoter composition is then applied over the entire surface or partially to the metal or the conversion layer.
  • the metal with the applied primer composition is thermally crosslinked or dried, with object temperatures of 120 ° C to 240 ° C, preferably 150 ° C to 225 ° C, preferably 175 ° C to 200 ° C, for a period of 0, 5 min to 30 min, preferably from 1 min to 20 min, preferably 3 min to 10 min, are advantageous.
  • object temperatures of 120 ° C to 240 ° C, preferably 150 ° C to 225 ° C, preferably 175 ° C to 200 ° C, for a period of 0, 5 min to 30 min, preferably from 1 min to 20 min, preferably 3 min to 10 min, are advantageous.
  • the person skilled in the art can determine suitable time / temperature conditions by means of preliminary tests. In rolling processes, peak metal temperatures (PMT) of 180 ° C to 230 °
  • compositions are thus thermally cured.
  • compositions can be continuous or discontinuous by means of
  • compositions according to the invention can be applied on one or both sides, locally or over the entire surface.
  • the baked layer thicknesses (dry layer thicknesses) of the adhesion promoter compositions may be from 10 to 1000 ⁇ m, preferably from 20 to 250 ⁇ m and preferably from 30 to 150 ⁇ m. in the
  • Roller processes are layer thicknesses of 5 ⁇ to 250 ⁇ , in particular 10 ⁇ to 50 ⁇ , preferably.
  • the plastic is applied, for example, by an injection molding process or by hot pressing on the metal and the metal physically and / or chemically connected to the plastic.
  • the plastic is by means of
  • Injection molding technology injected.
  • the coated metal part is inserted into the injection mold and back-injected after closing the tool with the plastic.
  • Upon contact of the plastic melt with the coated metal surface forms a cohesive bond or the adhesion between the components.
  • the cohesively connected hybrid component can then be removed from the injection mold and further processed or processed.
  • Bonding adhesion and degree of crosslinking are subjected to a heat treatment.
  • Hybrid components produced in this way have a permanent connection between the pretreated and coated metal and the plastic and show a high mechanical and dynamic load capacity.
  • Suitable metals are, for example, iron-containing alloys such as steel, aluminum, copper, magnesium, titanium and alloys of the aforementioned metals.
  • Preferred metals are steel, titanium, aluminum and alloys of the aforementioned metals, more preferably steel and aluminum and aluminum alloys.
  • Preferred steels are unalloyed steels or stainless steels. Steels with a protective coating are particularly preferred.
  • Suitable coatings are, for example, coatings of zinc, aluminum-silicon, aluminum-zinc, zinc-aluminum, zinc-iron or zinc-magnesium, aluminum-silicon, zinc-aluminum and zinc being preferred.
  • composition of the coatings is defined, for example, in the brochure "Schmelztauchveredelt.es Band and Blech" of the Stahl-Informations-Zentrum in the Stahl-Zentrum, Düsseldorf, Germany, 2010 edition.
  • the coated metal Before the application of the plastic, the coated metal can be trimmed, reshaped or deformed The deformation or deformation can take place before or after the application of the abovementioned compositions.
  • the application of the plastic to the coated metal can in a known manner, for. Example, by injection molding, pressing, laminating, injection molding or (co) extruding done.
  • the plastic is injected by means of injection molding technology.
  • the metal provided with the coatings according to the invention may be preheated in a range from 50 ° C to 250 ° C in order to maintain the temperature in the contact area with the plastic, e.g. when over-molding or coextruding for a good bond between primer and plastic.
  • Suitable plastics contain e.g. Polybutylene terephthalates, polyolefins,
  • the plastics are preferably reinforced (Reinforcing), for example, fiber-reinforced, with glass fiber (GF) or
  • Plastics contain fillers such as talc or chalk.
  • the plastics may further contain additives such as stabilizers, impact modifiers, flow aids and pigments.
  • Preferred polyamides (PA) are selected from the group consisting of
  • Particularly preferred polyamides are selected from polyamide 6, polyamide 6.6, polyamide 610, polyamide 1010 and mixtures thereof.
  • the polyamides preferably contain reinforcing agents.
  • Another object of the invention is a coating for hybrid components, comprising at least one conversion layer and at least one layer of the aforementioned adhesion promoter composition (adhesion promoter layer).
  • the coating is obtainable by the method according to the invention.
  • the coatings according to the invention can be used as adhesion promoters between metal and plastic of a hybrid component.
  • hybrid components wherein the metal is connected to the plastic at least by a coating according to the invention.
  • the hybrid components according to the invention are used, for example, in mechanical and plant engineering, vehicle construction, in the aerospace industry, in rail construction, in electronics or in electrical engineering. Typical applications are in the area of
  • Another object of the invention is a metal substrate which is coated with at least one coating according to the invention.
  • the substrate may, for. B. be a metallic semi-finished or a metallic molding.
  • the substrate is
  • Primer composition preferably a metal band, a metal panel, a metal profile, a metal casting or a metal wire.
  • the primer composition contains at least one copolyamide-based hot melt adhesive.
  • the primer composition may be in solution, in dispersion or as a solid.
  • the hotmelt adhesive contains at least one copolyamide.
  • the copolyamide can be prepared from amide monomers and comonomers. The comonomers preferably give copolyamides which have a melting point between 95 ° C. and 175 ° C.
  • the amide monomers are preferably selected from the group consisting of laurolactam, amionoundecanoic acid or mixtures thereof. Copolyamides based on laurolactam are particularly preferred.
  • the comonomers are preferably selected from aliphatic or
  • cycloaliphatic diamines aliphatic or cycloaliphatic dicarboxylic acids, lactams and mixtures thereof.
  • the comonomers contain, independently of each other, preferably 4 to 18 C atoms.
  • Suitable dicarboxylic acids are, for example, adipic acid, sebacic acid or dodecanedioic acid.
  • suitable diamines are hexamethylenediamine, decamethylenediamine or
  • Lactams such as caprolactam can also be used as Comonomer can be used.
  • Preferred comonomers are caprolactam and a polymer of adipic acid and hexamethylenediamine, preferably in a mass ratio of 1: 1.
  • the copolyamides preferably have amine numbers of 75 to 400 mmol / kg.
  • the weight-average molecular weight of the copolyamides is preferably found in a range of 15,000 to 70,000 g / mol (measured by means of
  • the relative solution viscosity is preferably 1.2 to 1.8 (determination according to ISO 307).
  • copolyamides or the hotmelt adhesive can be used in the inventive
  • compositions can be used in solution, in dispersion or in powder form, with the powder form being preferred.
  • a suitable solvent is, for example, m-cresol.
  • the powder form can be obtained for example by grinding, wherein the grain diameter is preferably ⁇ 200 ⁇ , preferably ⁇ 100 ⁇ and particularly preferably ⁇ 70 ⁇ (sieve analysis).
  • the grain diameter is preferably ⁇ 200 ⁇ , preferably ⁇ 100 ⁇ and particularly preferably ⁇ 70 ⁇ (sieve analysis).
  • at least one epoxide component and at least one blocked polyisocyanate are added to the copolyamide as further constituents of the hot-melt adhesive.
  • the epoxy component has an epoxy index of 1-2 Eq / kg.
  • the epoxide equivalent weight of the epoxy resins used may be between 400 to 4000 g / mol, preferably 700 to 3000 g / mol and preferably between 875 and 1000 g / mol lie (determined by SMS 2026).
  • the proportion of OH groups of suitable epoxy resins is preferably from 2000 to 4500 mmol / kg, preferably from 2300 to 4000 mmol / kg (method SMS 2367).
  • epoxide component compounds based on diols, polyols or dicarboxylic acids can be used as the epoxide component, diols being preferred and corresponding phenol-diol derivatives being particularly preferred.
  • Very particularly preferred phenol-diol derivatives are bisphenols, in particular bisphenol A.
  • the epoxide component is usually obtained by reaction with epichlorohydrin.
  • Suitable epoxy resins have a density of 1 to 1.3 kg / L, preferably 1.15 to 1.25 kg / L (25 ° C, determined according to ASTM D792).
  • the glass transition temperature (Tg) may be 20 ° C to 100 ° C, preferably 25 ° C to 90 ° C, preferably 40 ° C to 60 ° C and more preferably 45 to 55 ° C (determined according to ASTM D3418).
  • EPIKOTE Resin such as EPIKOTE Resin 1001 or 1009 from Hexion Specialty Chemicals, Inc.
  • the hotmelt adhesive preferably contains the epoxide component in a proportion of 2.5 to 10% by weight, preferably 4 to 6% by weight, in each case based on the total weight of the hotmelt adhesive.
  • the hot-melt adhesive furthermore comprises hardeners such as dicyandiamide (DCD), preferably in proportions of from 3 to 6% by weight, based on the total weight of epoxy resin. Hardening derivatives such as monuron or fenuron can be added for curing acceleration, whereby the curing temperatures can be lowered or the curing times can be shortened.
  • the proportion of blocked polyisocyanate is preferably 2.5 to 15 wt .-%, preferably 4 to 6 wt .-%, each based on the total weight of
  • the blocked polyisocyanate component may be aromatic, aliphatic or
  • Blocking agent for isocyanates such as oximes, phenols or
  • Caprolactam are known in the art. Preferably lies the
  • Polyisocyanate component as uretdione to be blocked are sold under the name VESTAGON by Evonik Industries, Germany.
  • the adhesion promoter composition may contain self-crosslinking or externally crosslinking binders (for the term "binder”, see Rompp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, Binders, pages 73 and 74)
  • self-crosslinking refers to the property of a binder to undergo crosslinking reactions with itself, provided that the binders contain complementary reactive functional groups that react with each other to crosslink, or that the binders contain a reactive functional group
  • such binder systems are referred to as externally crosslinking, in which one type of the complementary reactive functional groups is present in the binder, and the other type in a hardener or crosslinking agent Printing inks, Georg Thieme Ve rlag, Stuttgart, New York, 1998, Hardening, pages 274 to 276, especially page 275, below.
  • the primer composition may further include electrically conductive materials selected from graphite, carbon black, zinc dust, or mixtures of these materials, thereby forming electrically conductive primer compositions.
  • the hybrid components comprising coatings of electrically conductive adhesion promoter compositions can be provided with a cathodic dip coating (KTL).
  • the primer composition may further contain organic solvents. Accordingly, the hot melt adhesive may be in solution or as a dispersion. Suitable solvents are polar or non-polar organic solvents.
  • Mixtures of polar and nonpolar solvents can also be used.
  • the primer compositions may further contain colorants, preferably pigments.
  • colorants preferably pigments.
  • functional pigments such as
  • Suitable hotmelt adhesives are available, for example, from Evonik Industries, Germany, under the name VESTAMELT.
  • the types X1027-P1, X1038-P1, X1316-P1 and X1333-P1 may be mentioned.
  • graft copolymers of polyamine and polamide-forming monomers such as lactams or co-aminocarboxylic acids may also be present, as described in EP1065236A2:
  • the amino group concentration is preferably in the range of 100 to 2,500 mmol / kg.
  • polyamine for example, the following classes of substances can be used:
  • Tris (2-aminoethyl) amine N, N-bis (2-aminoethyl) -N ', N'-bis [2- [bis (2-aminoethyl) amino] ethyl] -1, 2-ethanediamine,
  • Linear polyethyleneimines which can be prepared by polymerization of 4,5-dihydro-1, 3-oxazoles and subsequent hydrolysis (Houben-Weyl, Methods of Organic Chemistry, Volume E20, pages 1482-1487, Georg Thieme Verlag Stuttgart, 1987) ;
  • branched polyethyleneimines which are obtainable by polymerization of aziridines (Houben-Weyl, Methods of Organic Chemistry, Volume E20, pages 1482-1487, Georg Thieme Verlag Stuttgart, 1987) and which generally have the following amino group distribution:
  • the polyamine in the preferred case has a number average molecular weight M n of at most 20,000 g / mol, more preferably of at most 10,000 g / mol and
  • Lactams or ⁇ -aminocarboxylic acids which are used as polyamide-forming monomers contain 4 to 19 and in particular 6 to 12 carbon atoms. Particular preference is given to using ⁇ -caprolactam and laurolactam or the associated co-aminocarboxylic acids.
  • the molar ratio C12 / C6 building block is preferably between 4: 1 to 1: 4.
  • the mass ratio of hot melt adhesive to graft copolymer is preferably between 19: 1 and 1: 1.
  • the functionalized polyolefin is in the simplest case polypropylene-based. But are also suitable Etylen / C3 to Ci2- ⁇ -olefin copolymers. For example, propene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene or 1-dodecene are used as C 3 - to C 12 -alpha-olefin. Furthermore, the ethylene / C3 to C12 ⁇ -olefin copolymers may also contain up to about 10 wt .-% maximum of olefin loci such as ethylidenenorbornene or 1, 4-hexadiene. As functionalization serve preferably
  • Dicarboxylic anhydride or an unsaturated dicarboxylic acid are introduced.
  • Suitable reagents are, for example, maleic anhydride or
  • maleic acid-grafted polyolefins has become widely used in industrial applications, particularly for impact modifiers or as compatibilizers in blends and mechanically reinforced systems
  • a typical representative of a functionalized polyolefin is the
  • Another functionalization option is the melt blend of unfunctionalized polyolefins with reactive compatibilizers containing epoxide or carboxylic acid anhydride moieties.
  • Copolymers consisting of ethylene, one or more non-reactive
  • Lotader AX8900 (Arkema) represents a typical representative with glycidyl methacrylate units.
  • the ratio of polyamide component to polyolefin component is between 9 to 1 and 2 to 3.
  • Granodine 958 A from Henkel, Germany, containing, inter alia, phosphoric acid and zinc bis (dihydrogen phosphate),
  • Granodine 958 A from Henkel, Germany, additionally containing 170 ppm of Grano Toner 38 from Henkel, Germany (component comprising fluoride and hydrogendifluoride anions),
  • Granodine 1455 T from Henkel, Germany, containing, inter alia, phosphoric acid and dihydrogen hexafluorotitanate and
  • HDG EA sheet thickness 0.6mm
  • the metal samples were coated with a primer composition. As composition were applied
  • Solvent-containing spray paint A containing 29% by weight of a copolyamide-based hot melt adhesive containing an epoxy component and a blocked polyisocyanate, and
  • Solvent-containing spray paint B containing 30 wt .-% of a A copolyamide-based hot melt adhesive containing an epoxy component and a blocked polyisocyanate.
  • compositions I to IV contain the same hot melt adhesives.
  • the paint system was applied by spraying with a layer thickness of 50 to 70 ⁇ m and the powder coating was applied electrostatically with a layer thickness of 50 to 100 ⁇ m.
  • the spray paint and powder coating were baked at 150 ° C for 5 minutes.
  • the coated sheets were placed in a preheated autoclave (oven). After the baking process, the metal sheets were cut with shearing shears into metal strips measuring 24.9 mm x 59.8 mm which were suitable for the injection molding cavity
  • the metal strips were then inserted into a tempered injection mold for the production of the final hybrid components and overmoulded with a thermoplastic.
  • the following molding compositions were used as the plastic component:
  • K4 PA12GF30 VESTAMID L-GF30 from Evonik Industries AG.
  • the plastics were processed on a type Allrounder 420
  • Tool temperature 80 ° C or 120 ° C and at an injection rate of about 30 cc / s.
  • tool temperatures of 120 ° C and 70 ° C and melt temperatures of 335 ° C and 270 ° C were used.
  • test specimens used had the following design features:
  • the specimens thus produced were stored at 50% relative humidity for at least 24 hours at 23 ° C to a uniform conditioning state
  • KV conversion agent
  • HV adhesion promoter composition
  • Temp
  • the results show that the coating of the conversion layer and the adhesion promoter layer can achieve an increased adhesion strength between metal and plastic in hybrid components compared to systems without a conversion layer.
  • the adhesive strength is increased in particular with conversion agents used which halide-containing, preferably fluoride-containing, are (converters B and C).

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Materials Engineering (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un élément composite à base de métal et de plastique. Le procédé comprend les étapes suivantes: a) prétraitement de la surface métallique par application d'au moins une couche de conversion, b) application d'au moins une couche d'une composition de promoteur d'adhésion et c) liaison du métal et du plastique. La couche de composition de promoteur d'adhésion contient au moins une colle thermofusible à base de copolyamide.
EP14702233.9A 2013-01-29 2014-01-29 Procédé de fabrication d'un element composite metal-plastique Withdrawn EP2951258A1 (fr)

Applications Claiming Priority (2)

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DE201310201388 DE102013201388A1 (de) 2013-01-29 2013-01-29 Verfahren zur Herstellung eines Metall-Kunststoff-Hybridbauteils
PCT/EP2014/051693 WO2014118211A1 (fr) 2013-01-29 2014-01-29 Procédé de fabrication d'un element composite metal-plastique

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EP14702529.0A Active EP2951259B1 (fr) 2013-01-29 2014-01-29 Composants hybrides de matériau en fibres composites
EP14702233.9A Withdrawn EP2951258A1 (fr) 2013-01-29 2014-01-29 Procédé de fabrication d'un element composite metal-plastique

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EP (3) EP2759580A1 (fr)
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KR (2) KR20150113967A (fr)
CN (2) CN105308144A (fr)
BR (4) BR122021018633B1 (fr)
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US10603872B2 (en) 2020-03-31
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EP2951259B1 (fr) 2020-03-04
DE102013201388A1 (de) 2014-07-31
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CN105308144A (zh) 2016-02-03
BR112015017978A2 (pt) 2017-07-11
BR122021018633B1 (pt) 2022-08-02
US20150375478A1 (en) 2015-12-31
JP2016510270A (ja) 2016-04-07
EP2759580A1 (fr) 2014-07-30
WO2014118211A1 (fr) 2014-08-07
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BR112015017991A2 (pt) 2017-07-11

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