EP3793824A1 - Bande ou tôle magnétique, procédé de fabrication d'une telle bande ou tôle magnétique et noyau feuilleté à partir de celle-ci - Google Patents

Bande ou tôle magnétique, procédé de fabrication d'une telle bande ou tôle magnétique et noyau feuilleté à partir de celle-ci

Info

Publication number
EP3793824A1
EP3793824A1 EP19730262.3A EP19730262A EP3793824A1 EP 3793824 A1 EP3793824 A1 EP 3793824A1 EP 19730262 A EP19730262 A EP 19730262A EP 3793824 A1 EP3793824 A1 EP 3793824A1
Authority
EP
European Patent Office
Prior art keywords
steel strip
electrical steel
melt adhesive
sheet
epoxy resin
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
EP19730262.3A
Other languages
German (de)
English (en)
Inventor
Ronald Fluch
Timothy KEPPERT
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl 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 Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Publication of EP3793824A1 publication Critical patent/EP3793824A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered 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
    • B32B15/08—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered 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
    • B32B15/08—Layered 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
    • B32B15/092—Layered 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 epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/26—Layered products comprising a layer of synthetic resin characterised by the use of special additives using curing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
    • C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
    • C08G59/4014—Nitrogen containing compounds
    • C08G59/4021—Ureas; Thioureas; Guanidines; Dicyandiamides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
    • C08G59/50—Amines
    • C08G59/504—Amines containing an atom other than nitrogen belonging to the amine group, carbon and hydrogen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/28—Metal sheet
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/35—Heat-activated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/02—Cores, Yokes, or armatures made from sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B32B2037/1215—Hot-melt adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/04—4 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/208—Magnetic, paramagnetic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/304—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2463/00—Presence of epoxy resin

Definitions

  • the invention relates to an electrical steel strip or sheet having at least one thermosetting water-based hot melt adhesive lacquer layer provided on one of its flat sides, a process for producing such an electrical steel strip or sheet, and a laminated core therefrom.
  • thermosetting hot melt adhesive lacquer that is, a reactive adhesive system with hotmelt adhesive - also referred to as a baked enamel -
  • thermosetting hot melt adhesive lacquer that is, a reactive adhesive system with hotmelt adhesive - also referred to as a baked enamel -
  • the separated sheet metal parts from such a coated electrical steel strip or sheet are stacked on top of one another and firstly glued and then hardened by a so-called baking process - that is, connected to packages via the parameters pressure, temperature and time.
  • the invention is therefore based on the object, starting from the above-described prior art, to provide an electrical strip or sheet with at least one thermosetting water-based hot melt adhesive layer provided on one of its flat sides, which has an increased melt viscosity during the baking process having.
  • the invention solves the stated problem with regard to the electrical tape or sheet based on the features of claim 1.
  • thermosetting water-based melt adhesive lacquer layer additionally has a precrosslinker which combines with the epoxy resin or the mixture of epoxy resins, in particular even at room temperature, the precrosslinker being an organic amine having three amino groups, namely an organic triamine, or a mixture of such organic amines is, a special state of the hot melt adhesive layer can be adjusted.
  • An organic triamine is an organic compound with exactly three amino groups. This is especially true for organic amines, namely organic triamines, which have three primary amino groups.
  • thermosetting water-based hotmelt adhesive layer Pre-crosslinking using such organic amines, ie the reaction of the amino groups with reactive epoxide groups of different epoxy resin molecules of the epoxy resin to form secondary and / or tertiary amines, results in comparatively bulky compounds in the thermosetting water-based hotmelt adhesive layer.
  • This precrosslinking according to the invention can be adjusted with the aid of organic amines having three amino groups, namely with the aid of organic diamines, in such a way that the melt viscosity of the thermosetting melt adhesive lacquer layer increases - and thus a flow of the hotmelt adhesive lacquer during cohesive bonding, for example with sheet metal parts to form a laminated particle - ket in the course of a baking process, can be prevented.
  • an organic triamine may be particularly suitable because such a comparatively stable precrosslinking forms with a sufficient degree of crosslinking.
  • Organic triamines are also distinguished by their solubility in water and comparatively low toxicity - and thus easy handling. Furthermore, they show a particularly low odor load.
  • a simplification in the adjustment of the proportions of epoxy resin or mixture of epoxy resins and precrosslinker can be achieved if the three amino groups of the precrosslinker are each primary amino groups.
  • a substantially uniform reactivity of the amino groups of the pre-crosslinker which facilitates the adjustment of the state of the hot-melt adhesive layer for its desired properties on the electrical steel or sheet.
  • the weight% of pre-crosslinker and epoxy resin or mixture of epoxy resins in the water-based thermosetting hot-melt adhesive lacquer layer has the following relation:
  • the at least predominant number of the primary amino groups of the precrosslinker each with different Connect epoxy resin molecules to secondary or tertiary amines.
  • Such formation of polymers results in molecular weight increase - this ratio of amino groups and epoxy groups of the present invention being ideal to achieve a level of pre-crosslinking which is wide enough to cause no gelling of the water-based hot melt adhesive varnish.
  • the stability of the dispersion at room temperature is not compromised.
  • This effect in particular, which signifies a long-term storage stability at room temperature, could be achieved to a surprisingly high extent - which, in turn, permits very simple handling of the hot-melt adhesive lacquer during application of the hot-melt adhesive lacquer layer or during subsequent drying on the electrical steel strip or sheet. can interpret, and advantageous properties such as increased drying rate of the hot melt adhesive layer on the electrical steel strip or sheet together with high hardness and at the same time can be very good elasticity.
  • the invention can also be distinguished above all with respect to the further use of the thus-coated electrical tape or sheet.
  • the melt viscosity of the hotmelt adhesive lacquer on the electrical steel strip or sheet can advantageously be influenced by means of the pre-crosslinking agent, ie can be increased - thus reducing the risk of leakage in the baking process in a cohesively bonded, coated electric blank or sheets or sheet metal parts produced therefrom.
  • This is achieved with the aid of the ratio according to the invention of the weight percent of precrosslinker and epoxy resin or mixture of epoxy resins in the water-based thermosetting hot-melt adhesive lacquer layer - surprisingly, since there is no adverse effect on the stability and dispersion or on the handling of the Hot melt adhesive, z. B. when applying the hot melt adhesive layer, must be taken into account.
  • a polyether triamine preferably a polyoxypropylene triamine
  • precrosslinker which is not only inexpensive but can also be characterized by good elasticity of a dried and a cured hotmelt adhesive lacquer layer
  • Polyethertriamine preferably a Polyoxypropylene triamine, as a precrosslinker, are also distinguished by their water-solubility and comparatively low toxicity-and thus easy handling. Furthermore, they show a particularly low odor load.
  • an amino group of the polyether triamine is bonded to secondary carbon atoms of terminal ether groups, steric hindrance can be achieved on the carbon carrying the amino group, thus making the reactivity and the degree of crosslinking and hence the volume of the precrosslinker and epoxy resin compound advantageous are adjustable. This also applies if all the amino groups of the polyether triamine are bonded to secondary carbon atoms of terminal ether groups.
  • the epoxy resin or the mixture of epoxy resins has a bisphenol A base, a particularly inexpensive hotmelt adhesive layer can be obtained.
  • thermosetting hot melt adhesive layer has a cyanamide-based curing agent which is latent at room temperature and in particular consists of dicyandiamide.
  • thermosetting water-based hot melt adhesive lacquer layer 2 to 10 wt .-%, in particular 3 to 8 wt .-%, of a latent curative cyanamide, especially dicyandiamide having.
  • thermohardenable water-based hotmelt adhesive lacquer layer may preferably comprise water as the remainder and, in particular, 4 to 20 wt.%, Co-solubilizer, preferably 1-methoxypropanol as co-solvent.
  • a special feature is an electrical steel strip or sheet whose thermosetting hot melt adhesive layer has dried. This is expressed by an increase in the adhesive strength or the roller peel resistance.
  • thermosetting hotmelt adhesive lacquer layer may be particularly distinguished, which comprises:
  • hardener in particular dicyanamide, 0.2 to 4 wt .-%, in particular 0.4 to 2 wt .-%, triamine as a precrosslinker having an average molar mass of 350 to 550 g / mol.
  • the invention has also the object of providing a method for producing a laminated core from an electrical steel strip or sheet, which is easy to carry out and allows a particularly secure bonding - without a flow out of the hot melt adhesive coating during the cohesive connection to fear.
  • the invention achieves the object with regard to the method on the basis of the features of claim 13.
  • the manufacture of an electrical strip or sheet coated according to the invention can be carried out by applying, in particular roll application or spraying, the thermosetting water-based hot melt adhesive lacquer to at least one flat side of the electrical strip or sheet.
  • the hotmelt adhesive lacquer layer of the electrode blank or sheet coated according to the invention in particular at 180 to 280 ° C. strip temperature, is dried, sheet metal parts are separated from the electrical strip or sheet, the sheet metal parts are stacked to form a laminated core and the laminated core is glued, in particular by thermal, preferably at 100 ° C to 250 ° C, activating the hot melt adhesive layer.
  • thermosetting hotmelt adhesive layer not only does not impair the adhesive strength and the adhesiveness of the thermosetting hotmelt adhesive layer, but also the melt viscosity is increased in such a way that its unwanted outflow is avoided. Also in the process of heating, ie during the heating phase, a controlled final crosslinking or a controlled hardening can be achieved. Due to the simple and reliable production, laminated cores obtained from the abovementioned process are not only cost-effective, they are also distinguished by particularly high strength and outstanding magnetic properties.
  • those laminated cores may be made from an electrical steel strip or sheet according to any one of claims 1 to 12, whose thermosetting hot melt adhesive lacquer layer has been dried and cured by one of the processes according to claim 13 or 14.
  • the improved relation according to the invention for achieving optimum pre-crosslinking can, inter alia, make possible a particularly advantageous balance of storage stability, handling and flow safety of the hot melt adhesive layer.
  • an electrical steel strip or sheet is coated with a thermosetting water-based hot melt adhesive lacquer layer, which hot melt lacquer layer has 100 grams: 50 grams of an epoxy resin with an average molar mass of 2000 g / mol,
  • thermosetting hot melt adhesive layer wt .-% of precrosslinker and epoxy resin or mixture of epoxy resins in the thermosetting hot melt adhesive layer meet the relation:
  • thermosetting water-based hotmelt adhesive layer By this composition, a special state of the hot melt adhesive layer can be adjusted.
  • the primary amino groups of triamine react namely at least at room temperature with reactive epoxy groups of the epoxy resin to secondary and tertiary amines. This results in relatively bulky compounds in the thermosetting water-based hotmelt adhesive layer or leads to a molecular weight increase.
  • the ratio of amino groups and epoxy groups of the invention is also ideal for achieving a level of pre-crosslinking which is broad enough not to cause gelling of the water-based hot melt adhesive varnish.
  • Such a hot-melt adhesive varnish has a high storage stability at room temperature, without adversely affecting its properties with regard to adhesiveness or adhesive strength on the electrical steel strip or sheet. For example, it can easily be stored for 6 months. Accordingly, a simple handling of the water-based thermosetting hot melt adhesive coating is given.
  • the precrosslinker of embodiment 1 shows a further advantageous property, namely a steric hindrance on the carbon carrying the amino group. This is because the amino group of the polyether triamine is bonded to a secondary carbon atom of a terminal ether group. This affects the reactivity of the amino group. In particular, it lowers the propensity of a secondary amino group of the precrosslinker - that is, an amino group which is ready to be compounded with an epoxy resin molecule - to react with a second epoxy resin molecule to form a tertiary amino group. So it is not only the degree of pre-crosslinking very easily adjustable, the hot-melt adhesive layer is also comparatively storage-stable. This is given at room temperature even over a period of six months.
  • thermosetting Schmelzkleklackack layer of the embodiment 1 forms
  • thermosetting melt adhesive lacquer layer is characterized by a high hardness and at the same time very good elasticity.
  • the improved toughness is of particularly great importance - in combination with the excellent adhesive strength of the dried thermosetting hotmelt adhesive layer on the electrical steel strip or sheet, significant improvements are made with regard to the roller peel resistance.
  • thermosetting hot melt adhesive layer of Sample 1 corresponds to a conventional commercially available baked enamel.
  • Sample 2 State of the art
  • thermosetting melt adhesive lacquer layer of sample 2 corresponds to the embodiment 1 of the invention (sample 3), however, without the addition of the precrosslinker.
  • thermosetting hotmelt adhesive layer corresponds to the embodiment 1 according to the invention. This was applied in a layer thickness of 5 pm to a silicon-alloyed (about 3% Si) electrical steel by roll application and subjected to drying at a belt temperature (PMT - peak metal temperature) of 220 ° C.
  • a particular advantage according to the invention lies in the adjustability of the melt viscosity of the dried thermosetting hotmelt adhesive layer during curing. This is especially due to the special pre-crosslinking by the According to the invention, the ratio of the weight percent of precrosslinker and epoxy resin in the thermosetting hot melt adhesive layer is achieved. In this way, the danger of the outflow of hot melt adhesive varnish in the baking process can be reduced in a material-bonding manner to electrical tapes or sheets coated with hot-melt adhesive varnish or from sheet metal parts produced in this way.
  • slightly increased wt .-% of the precrosslinker not only lead to a massive deterioration of the storage stability of the thermosetting water-based hot melt adhesive, but increase the melt viscosity of the dried thermosetting melt adhesive lacquer layer on the electrical steel or sheet to an extent which deteriorates its adhesive strength to an unacceptable extent.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Epoxy Resins (AREA)

Abstract

L'invention concerne une bande ou tôle magnétique comportant au moins un revêtement adhésif thermofusible à base d'eau thermodurcissable sur l'une de ses faces planes, un procédé de fabrication d'une telle bande ou tôle magnétique et un noyau feuilleté à partir de celle-ci. Afin d'augmenter la viscosité à l'état fondu dans le procédé de cuisson, la couche de revêtement thermofusible à base d'eau thermodurcissable à chaud comprend en outre un préréticulant raccordé à la résine époxy ou à un mélange de résines époxy, le préréticulant étant une amine organique comportant trois groupes amino, à savoir une triamine organique, ou un mélange de ces amines organiques.
EP19730262.3A 2018-05-18 2019-05-20 Bande ou tôle magnétique, procédé de fabrication d'une telle bande ou tôle magnétique et noyau feuilleté à partir de celle-ci Pending EP3793824A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18173378.3A EP3569405A1 (fr) 2018-05-18 2018-05-18 Bande ou tôle électrique, procédé de fabrication d'une telle bande ou tôle électrique ainsi qu'empilement de tôles correspondant
PCT/EP2019/063010 WO2019219983A1 (fr) 2018-05-18 2019-05-20 Bande ou tôle magnétique, procédé de fabrication d'une telle bande ou tôle magnétique et noyau feuilleté à partir de celle-ci

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EP3793824A1 true EP3793824A1 (fr) 2021-03-24

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EP18173378.3A Withdrawn EP3569405A1 (fr) 2018-05-18 2018-05-18 Bande ou tôle électrique, procédé de fabrication d'une telle bande ou tôle électrique ainsi qu'empilement de tôles correspondant
EP19730262.3A Pending EP3793824A1 (fr) 2018-05-18 2019-05-20 Bande ou tôle magnétique, procédé de fabrication d'une telle bande ou tôle magnétique et noyau feuilleté à partir de celle-ci

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EP (2) EP3569405A1 (fr)
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KR (1) KR20210010914A (fr)
CN (1) CN112368144B (fr)
WO (1) WO2019219983A1 (fr)

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JP2574698B2 (ja) * 1989-02-07 1997-01-22 川崎製鉄株式会社 積層鉄芯の製造方法
JP3369940B2 (ja) * 1997-11-27 2003-01-20 日本鋼管株式会社 接着強度、耐食性及び耐ブロッキング性に優れた接着鉄芯用電磁鋼板の製造方法
JP2000173816A (ja) 1998-12-02 2000-06-23 Nippon Steel Corp 接着用表面被覆電磁鋼板とその製造方法
JP3732971B2 (ja) 1999-05-28 2006-01-11 Ｊｆｅスチール株式会社 剪断強度及び剥離強度に優れた接着鉄芯用電磁鋼板の製造方法
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EP3072936A1 (fr) 2015-03-24 2016-09-28 Voestalpine Stahl GmbH Bobine et bande ou tôle électrique
JP6629539B2 (ja) 2015-07-17 2020-01-15 中国塗料株式会社 防食塗料組成物、防食塗膜、防食塗膜付き基材及びその製造方法

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EP3569405A1 (fr) 2019-11-20
WO2019219983A1 (fr) 2019-11-21
US20210309894A1 (en) 2021-10-07
CN112368144B (zh) 2023-11-14
JP2021524392A (ja) 2021-09-13
KR20210010914A (ko) 2021-01-28
CN112368144A (zh) 2021-02-12
JP7364598B2 (ja) 2023-10-18

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