EP3793824A1 - Electrical steel strip or sheet, method for producing such an electrical steel strip or sheet, and lamination stack made therefrom - Google Patents

Electrical steel strip or sheet, method for producing such an electrical steel strip or sheet, and lamination stack made therefrom

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)
French (fr)
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/en
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
    • 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
    • B32B2307/542—Shear strength
    • 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
    • B32B2457/00—Electrical equipment
    • 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
    • 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
    • B32B37/1284—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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Abstract

An electrical steel strip or sheet having at least one thermally curable water-based hot-melt adhesive coating provided on one of the flat sides of the electrical steel strip or sheet, a method for producing such an electrical steel strip or sheet, and a lamination stack made therefrom are disclosed. In order to be able to have increased melt viscosity in the baking process, it is proposed that the thermally curable water-based hot-melt adhesive coating additionally has a pre-crosslinker that bonds to the epoxy resin or a mixture of epoxy resins, the pre-crosslinker being an organic amine having three amino groups, namely an organic triamine, or a mixture of such organic amines.

Description

Elektroband oder -blech. Verfahren zur Herstellung solch eines Elektrobands oder - blechs sowie Blechpaket daraus  Electrical tape or sheet. Method for producing such an electrical strip or sheet and laminated core therefrom
Technisches Gebiet Technical area
Die Erfindung betrifft ein Elektroband oder -blech mit wenigstens einer auf einer sei- ner Flachseiten vorgesehenen, thermohärtbaren wasserbasierten Schmelzklebelack- schicht, ein Verfahren zur Herstellung solch eines Elektrobands oder -blechs sowie ein Blechpaket daraus. 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.
Stand der Technik State of the art
Aus dem Stand der Technik sind zahlreiche Verfahren zur Klebstoffbeschichtung der Oberfläche eines Elektrobands oder -blechs bekannt, um daraus abgetrennte Blech- teile stoffschlüssig zu einem Blechpaket verkleben zu können. Beispielsweise werden Elektrobänder bzw. -bleche mit thermohärtbarem Schmelzklebelack, das heißt, ei- nem reaktiven Klebstoffsystem mit Schmelzklebstoff - auch als Backlack bezeichnet - beschichtet (WO 2014/089593 A1 ). Nach dem Trocknen, also dem Entfernen von Lösungsmittel aus der thermohärtbaren Schmelzklebelackschicht werden die abge- trennten Blechteile aus solch einem beschichteten Elektroband bzw. -blech überei- nandergestapelt und durch einen sogenannten Backprozess zunächst zum Verkle- ben und dann zum Aushärten gebracht - das heißt, über die Parameter Druck, Tem- peratur und Zeit miteinander stoffschlüssig zu Paketen verbunden. Numerous methods for the adhesive coating of the surface of an electrical strip or sheet are known from the prior art in order to be able to glue sheet metal parts separated therefrom into a laminated core in a material-locking manner. For example, electrical tapes or sheets are coated with thermosetting hot melt adhesive lacquer, that is, a reactive adhesive system with hotmelt adhesive - also referred to as a baked enamel - (WO 2014/089593 A1). After drying, ie the removal of solvent from the thermosetting melt adhesive lacquer layer, 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.
Um hochfeste Blechpakete mit hervorragenden magnetischen Eigenschaften zu er- halten, gilt es, Klebefähigkeit bzw. -zustand des Schmelzklebelacks möglichst kon- stant einzustellen bzw. stabil zu halten - und zwar vor dessen Aufbringen auf das Elektroband oder -blech bis zum Trocknen bzw. bis zum Endaushärten, also bis zum Backprozess. Verfahrenstechnisch problematisch erweist sich nicht zuletzt das stoff- schlüssige Verbinden, da hierbei von wesentlicher Bedeutung ist, einen Austritt von Backlack während des Backprozesses zu vermeiden. Darstellung der Erfindung In order to obtain high-strength laminated cores with outstanding magnetic properties, it is necessary to set the adhesive capacity or state of the hotmelt adhesive lacquer as constant as possible or to keep it stable - before it is applied to the electrical steel or sheet until it is dry or until for final curing, ie until the baking process. Last but not least, the material-coherent bonding proves to be problematic in terms of process technology, as it is essential to prevent the escape of baked enamel during the baking process. Presentation of the invention
Die Erfindung hat sich daher die Aufgabe gestellt, ausgehend vom eingangs geschil- derten Stand der Technik, ein Elektroband oder -blech mit wenigstens einer auf einer seiner Flachseiten vorgesehenen, thermohärtbaren wasserbasierten Schmelzklebe- lackschicht zur Verfügung zu stellen, welche während dem Backprozess eine erhöhte Schmelzviskosität aufweist. 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.
Die Erfindung löst die gestellte Aufgabe hinsichtlich des Elektrobands oder -blechs anhand der Merkmale des Anspruchs 1 . The invention solves the stated problem with regard to the electrical tape or sheet based on the features of claim 1.
Weist die thermohärtbare wasserbasierte Schmelzklebelackschicht zusätzlich einen mit dem Epoxidharz oder der Mischung aus Epoxidharzen, insbesondere bereits bei Raumtemperatur, verbindenden Vorvernetzer auf, wobei der Vorvernetzer ein orga- nisches Amin mit drei Aminogruppen, nämlich ein organisches Triamin, oder eine Mi- schung solcher organischer Amine ist, kann ein besonderer Zustand der Schmelzkle- belackschicht eingestellt werden. Als organisches Triamin ist eine organische Verbin- dung mit genau drei Aminogruppen zu verstehen. Dies gilt insbesondere auch für organischer Amine, nämlich organische Triamine, welche drei primäre Aminogruppen aufweisen. Durch eine Vorvernetzung mithilfe derartiger organischer Amine, also der Reaktion der Aminogruppen mit reaktiven Epoxidgruppen unterschiedlicher Epoxid- harzmoleküle des Epoxidharzes zu sekundären und/oder tertiären Aminen, ergeben sich vergleichsweise voluminöse Verbindungen in der thermohärtbaren wasserba- sierten Schmelzklebelackschicht. Diese erfindungsgemäße Vorvernetzung kann mit- hilfe organischer Amine mit drei Aminogruppen, nämlich mithilfe organischer Tria- mine, derart eingestellt werden, dass sich die Schmelzviskosität der thermohärtbaren Schmelzklebelackschicht erhöht - und somit ein Ausfließen des Schmelzklebelacks während einem stoffschlüssigen Verbinden, etwa mit Blechteilen zu einem Blechpa- ket im Zuge eines Backprozesses, verhindert werden kann. Dies jedoch, ohne die Klebefähigkeit der Schmelzklebelackschicht bzw. deren Haftfestigkeit auf dem Elekt roband oder -blech zu beeinträchtigen. Auch die Stabilität der Dispersion des was- serbasierten Schmelzklebelacks während seiner Lagerung bei Raumtemperatur sowie bei dessen weiteren Handhabung, also Aufbringen auf das Elektroband oder - blech bzw. folgende Trocknung der aufgebrachten Schmelzklebelackschicht usw. kann gewährleistet bleiben. If the 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. 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. However, this without affecting the adhesiveness of the hot melt adhesive layer or its adhesive strength on the Elekt roband or sheet. Also, the stability of the dispersion of the water-based hot melt adhesive coating during its storage at room temperature and in its further handling, so applying to the electrical steel or - sheet or subsequent drying of the applied hot melt adhesive layer, etc. can be guaranteed.
Als Vorvernetzer kann sich ein organisches Triamin besonders eignen, da solch eines vergleichsweise stabile Vorvernetzungen mit einem ausreichenden Vernetzungsgrad ausbildet.  As a precrosslinker, an organic triamine may be particularly suitable because such a comparatively stable precrosslinking forms with a sufficient degree of crosslinking.
Organische Triamine zeichnen sich auch durch ihre Wasserlöslichkeit, und ver- gleichsweise geringe Giftigkeit - und somit einfache Handhabbarkeit - aus. Des Wei- teren zeigen sie eine besonders geringe Geruchsbelastung.  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.
Eine Vereinfachung in der Einstellung der Mengenverhältnisse von Epoxidharz oder Mischung aus Epoxidharzen und Vorvernetzer ist erreichbar, wenn die drei Amino- gruppen des Vorvernetzers jeweils primäre Aminogruppen sind. Somit kann nämlich von einer im Wesentlichen einheitlichen Reaktivität der Aminogruppen des Vorver- netzers ausgegangen werden, was die Einstellung des Zustands der Schmelzklebe- lackschicht für dessen gewünschte Eigenschaften auf dem Elektroband oder -blech erleichtert. 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. Thus, it can be assumed that 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.
Besonders vorteilhaft kann sich zudem heraussteilen, wenn die Gew.-% von Vorver- netzer und Epoxidharz oder Mischung aus Epoxidharzen in der wasserbasierten ther- mohärtbaren Schmelzklebelackschicht folgende Relation erfüllen: In addition, it can be particularly advantageous if 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:
Gew.-% Vorvernetzer = Wt .-% precrosslinker logo CNRS logo INIST
Gew. % Epoxidharz oder Wt.% Epoxy resin or
der Mischung aus Epoxidharzen mittlere M des Vorvernetzers the mixture of epoxy resins average M of the precrosslinker
mittlere M des Epoxidharzes oder X * mittlere Anzahl der Aminogruppen der der Mischung aus Epoxidharzen Vorvernetzermoleküle wobei X für eine Zahl von 1 ,6 bis 28,9, insbesondere 2,1 bis 19,4, insbesondere 2,9 bis 7,2, und M für molare Masse steht.  average M of the epoxy resin or X * average number of amino groups of the mixture of epoxy resins Vorvernetzermoleküle wherein X is a number from 1, 6 to 28.9, especially 2.1 to 19.4, in particular 2.9 to 7.2, and M stands for molar mass.
Es kann davon ausgegangen werden, dass die zumindest überwiegende Zahl der primären Aminogruppen des Vorvernetzers jeweils mit unterschiedlichen Epoxidharzmolekülen zu sekundären bzw. mehrheitlich tertiären Aminen verbinden. Durch die derartige Bildung von Polymeren kommt es zu einer Molmassenvergröße- rung - wobei dieses erfindungsgemäße Verhältnis von Aminogruppen und Epoxid- gruppen ideal ist, um einen Grad an Vorvernetzung zu erreichen, welcher weiträumig genug ist, kein Gelieren des wasserbasierten Schmelzklebelacks zu verursachen. Somit wird die Stabilität der Dispersion bei Raumtemperatur nicht gefährdet. Beson- ders dieser Effekt, welcher eine bei Raumtemperatur lange Lagerstabilität bedeutet, konnte in überraschend hohem Ausmaß erreicht werden - was wiederum eine sehr einfache Handhabung des Schmelzklebelacks beim Aufbringen der Schmelzklebe- lackschicht bzw. bei einem folgenden Trocknen auf dem Elektroband oder -blech be- deuten kann, sowie vorteilhafte Eigenschaften wie erhöhte Antrocknungsgeschwin- digkeit der Schmelzklebelackschicht auf dem Elektroband oder -blech samt hoher Härte bei gleichzeitig sehr guter Elastizität nach sich ziehen kann. It can be assumed that 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. Thus, 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.
Besonders kann sich die Erfindung vor allem auch hinsichtlich der weiteren Verwen- dung des derart beschichteten Elektrobands oder -blechs auszeichnen. Die Schmelz- viskosität des Schmelzklebelacks auf dem Elektroband oder -blech ist mithilfe des Vorvernetzers nämlich vorteilhaft beeinflussbar, nämlich erhöhbar - womit die Gefahr des Ausfließens im Backprozess stoffschlüssig zu verbindender, beschichteter Elekt- robänder oder -bleche bzw. daraus hergestellter Blechteile reduziert werden kann. Dies gelingt mithilfe der erfindungsgemäßen Relation der Gew.-% von Vorvernetzer und Epoxidharz oder Mischung aus Epoxidharzen in der wasserbasierten themnohärt- baren Schmelzklebelackschicht - und zwar in überraschender weise, da keine nach- teilige Beeinflussung hinsichtlich der Stabilität und Dispersion bzw. hinsichtlich der Handhabung des Schmelzklebelacks, z. B. beim Aufbringen der Schmelzklebelack- schicht, in Kauf genommen werden muss. Derart ist es also unter anderem möglich, hochfeste Blechpakete mit hervorragenden magnetischen Eigenschaften zu erhalten.  In particular, 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. Thus, it is possible, inter alia, to obtain high-strength laminated cores with excellent magnetic properties.
Hinsichtlich der vergleichsweise stabilen Vorvernetzungen mit ausreichendem Ver- netzungsgrad eignet sich insbesondere ein Polyethertriamin, vorzugsweise ein Po- lyoxypropylentriamin, als Vorvernetzer, welche nicht nur kostengünstig sind, sondern sich auch durch gute Elastizität einer getrockneten sowie einer ausgehärteten Schmelzklebelackschicht auszeichnen können. Polyethertriamin, vorzugsweise ein Polyoxypropylentriamin, als Vorvernetzer zeichnen sich auch durch ihre Wasserlös- lichkeit, und vergleichsweise geringe Giftigkeit - und somit einfache Handhabbarkeit - aus. Des Weiteren zeigen sie eine besonders geringe Geruchsbelastung. With regard to the comparatively stable precrosslinking with a sufficient degree of crosslinking, in particular a polyether triamine, preferably a polyoxypropylene triamine, as precrosslinker, which is not only inexpensive but can also be characterized by good elasticity of a dried and a cured hotmelt adhesive lacquer layer, is suitable. 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.
Ist eine Aminogruppe des Polyethertriamins an sekundären Kohlenstoffatomen end- ständiger Ethergruppen gebunden, kann eine sterische Hinderung auf den, die Ami- nogruppe tragenden Kohlenstoff, erreicht werden - womit die Reaktivität sowie der Vernetzungsgrad und somit das Volumen der Verbindung aus Vorvernetzer und Epo- xidharz vorteilhaft einstellbar sind. Dies gilt weiter auch, wenn alle Aminogruppen des Polyethertriamins an sekundären Kohlenstoffatomen endständiger Ethergruppen ge- bunden sind. If 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.
Weist das das Epoxidharz oder die Mischung aus Epoxidharzen eine Bisphenol-A- Basis auf, kann eine besonders kostengünstige Schmelzklebelackschicht erhalten werden. If the epoxy resin or the mixture of epoxy resins has a bisphenol A base, a particularly inexpensive hotmelt adhesive layer can be obtained.
Eine einfache Herstellung bzw. weitere Handhabung der thermohärtbaren Schmelz- klebelackschicht kann erreicht werden, wenn diese thermohärtbare Schmelzklebe- lackschicht einen bei Raumtemperatur latenten Härter auf Cyanamidbasis, insbeson- dere aus Dicyandiamid bestehend, aufweist. A simple production or further handling of the thermosetting hot melt adhesive layer can be achieved if this thermosetting hot melt adhesive layer has a cyanamide-based curing agent which is latent at room temperature and in particular consists of dicyandiamide.
Die genannten Vorteile sind besonders dann erreichbar, wenn die thermohärtbare wasserbasierte Schmelzklebelackschicht The advantages mentioned are particularly achievable when the thermosetting water-based melt adhesive lacquer layer
35 bis 55 Gew.-%, insbesondere 40 bis 50 Gew.-%, eines Epoxidharzes oder einer Mischung aus Epoxidharzen mit einer mittleren molaren Masse von 1500 bis 2000 g/mol und  35 to 55 wt .-%, in particular 40 to 50 wt .-%, of an epoxy resin or a mixture of epoxy resins having an average molar mass of 1500 to 2000 g / mol and
0,1 bis 2 Gew.-%, insbesondere 0,2 bis 1 ,0 Gew.-%, Triamin als Vorvernetzer mit einer mittleren molaren Masse von 350 bis 550 g/mol aufweist. Vorteilhaft kann sich weiter heraussteilen, wenn die thermohärtbare wasserbasierte Schmelzklebelackschicht 2 bis 10 Gew.-%, insbesondere 3 bis 8 Gew.-%, eines la- tenten Härters auf Cyanamidbasis, insbesondere Dicyandiamid, aufweist. 0.1 to 2 wt .-%, in particular 0.2 to 1, 0 wt .-%, triamine as a precrosslinker having an average molar mass of 350 to 550 g / mol. Advantageously, it can be further distinguished if the 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.
Vorzugsweise kann die thermohärtbare wasserbasierte Schmelzklebelackschicht als Rest Wasser sowie, insbesondere 4 bis 20 Gew.-%, Co-Löser, vorzugsweise 1 -Me- thoxy-propanol als Co-Löser, aufweisen. The 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.
Die genannten Vorteile sind besonders dann erreichbar, wenn die thermohärtbare wasserbasierte Schmelzklebelackschicht The advantages mentioned are particularly achievable when the thermosetting water-based melt adhesive lacquer layer
35 bis 55 Gew.-%, insbesondere 40 bis 50 Gew.-%, eines Epoxidharzes oder einer Mischung aus Epoxidharzen mit einer mittleren molaren Masse von 1500 bis 2000 g/mol und  35 to 55 wt .-%, in particular 40 to 50 wt .-%, of an epoxy resin or a mixture of epoxy resins having an average molar mass of 1500 to 2000 g / mol and
0,1 bis 2 Gew.-%, insbesondere 0,2 bis 1 ,0 Gew.-%, Triamin als Vorvernetzer mit einer mittleren molaren Masse von 350 bis 550 g/mol,  0.1 to 2 wt .-%, in particular 0.2 to 1, 0 wt .-%, triamine as a precrosslinker having an average molar mass of 350 to 550 g / mol,
2 bis 10 Gew.-%, insbesondere 3 bis 8 Gew.-%, eines latenten Härters auf Cyanamidbasis, insbesondere Dicyandiamid, und  2 to 10 wt .-%, in particular 3 to 8 wt .-%, of a cyanamide-based latent curing agent, in particular dicyandiamide, and
als Rest Wasser sowie, insbesondere 4 bis 20 Gew.-%, Co-Löser, vorzugsweise 1 - Methoxy-propanol als Co-Löser, aufweist. as the remainder water as well as, in particular 4 to 20 Gew. -%, Co-Löser, preferably 1 - Methoxy-propanol as co-dissolver exhibits.
Besonders auszeichnen kann sich ein Elektroband oder -blech, deren thermohärtbare Schmelzklebelackschicht getrocknet ist. Diese äußert sich anhand einer Erhöhung der Klebefestigkeit bzw. des Rollschälwiderstands. 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.
Bezüglich der genannten Vorteile kann sich eine getrocknete thermohärtbare Schmelzklebelackschicht besonders auszeichnen, welche aufweist: With regard to the stated advantages, a dried thermosetting hotmelt adhesive lacquer layer may be particularly distinguished, which comprises:
75 bis 92,8 Gew.-%, insbesondere 80 bis 90 Gew.-%, eines Epoxidharzes oder einer Mischung aus Epoxidharzen mit einer mittleren molaren Masse von 1500 bis 2000 g/mol,  From 75 to 92.8% by weight, in particular from 80 to 90% by weight, of an epoxy resin or a mixture of epoxy resins having an average molar mass of from 1500 to 2000 g / mol,
4 bis 24,8 Gew.-%, insbesondere 7 bis 12 Gew.-%, Härter, insbesondere Dicyanamid, 0,2 bis 4 Gew.-%, insbesondere 0,4 bis 2 Gew.-%, Triamin als Vorvernetzer mit einer mittleren molaren Masse von 350 bis 550 g/mol. From 4 to 24.8% by weight, in particular from 7 to 12% by weight, of 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.
Die Erfindung hat sich außerdem die Aufgabe gestellt, ein Verfahren zur Herstellung eines Blechpakets aus einem Elektroband oder -blech zur Verfügung zu stellen, wel- ches einfach durchzuführen ist und ein besonders sicheres Verkleben ermöglicht - ohne ein Ausfließen des Schmelzklebelacks während dem stoffschlüssigen Verbin- den befürchten zu müssen. 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.
Die Erfindung löst die Aufgabe hinsichtlich des Verfahrens anhand der Merkmale des Anspruchs 13. The invention achieves the object with regard to the method on the basis of the features of claim 13.
Verfahrenstechnisch einfach kann die Herstellung eines erfindungsgemäß beschich- teten Elektrobands oder -blechs erfolgen durch Aufbringen, insbesondere Rollenap- plikation oder Aufsprühen, des thermohärtbaren wasserbasierten Schmelzklebelack- lacks auf mindestens eine Flachseite des Elektrobands oder -blechs erfolgen. In terms of process technology, 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.
Hierzu wird die Schmelzklebelackschicht des erfindungsgemäß beschichteten Elekt- robands oder -blechs, insbesondere bei 180 bis 280 °C Bandtemperatur, getrocknet, werden Blechteile aus dem Elektroband oder -blech abgetrennt, die Blechteile zu ei- nem Blechpaket gestapelt und das Blechpaket verklebt, insbesondere durch thermi- sches, bevorzugt bei 100°C bis 250°C, Aktivieren der Schmelzklebelackschicht. For this purpose, 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.
Es hat sich herausgestellt, dass aufgrund der erfindungsgemäßen Vorvernetzung nicht nur keine Beeinträchtigung der Haftfestigkeit und der Klebefähigkeit der thermo- härtbaren Schmelzklebelackschicht ergibt, sondern auch die Schmelzviskosität derart erhöht ist, dass sich deren unerwünschtes Ausfließen vermieden wird. Auch im Pro- zess des Erwärmens, also während der Aufheizphase kann eine kontrollierte Endver- netzung bzw. ein kontrolliertes Aushärten erreicht werden. Aus dem genannten Verfahren erhaltene Blechpakete sind aufgrund der einfachen und sicheren Herstellung nicht nur kostengünstig, sie zeichnen sich auch durch be- sonders hohe Festigkeit und hervorragende magnetische Eigenschaften aus. It has been found that due to the pre-crosslinking according to the invention 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.
Insbesondere können sich jene Blechpakete aus einem Elektroband oder -blech nach einem der Ansprüche 1 bis 12 auszeichnen, deren thermohärtbare Schmelzklebe- lackschicht nach einem der Verfahren nach Anspruch 13 oder 14 getrocknet und aus- gehärtet ist. In particular, 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.
Weg zur Ausführung der Erfindung Way to carry out the invention
Im Folgenden wird beispielhaft die Erfindung anhand einer Ausführungsvariante be- schrieben. In the following, the invention will be described by way of example with reference to an embodiment variant.
Ausführungsbeispiel 1 : Embodiment 1
Die erfindungsgemäß verbesserte Relation zur Erreichung einer optimalen Vorver- netzung kann unter anderem eine besonders vorteilhafte Ausgewogenheit von Lager- stabilität, Handhabbarkeit und Ausfließsicherheit der Schmelzklebelackschicht er- möglichen. Je größer der Wert für X ist, desto geringer ist die Masse von Vorvernetzer in Relation zum Epoxidharz oder zur Mischung aus Epoxidharzen. Zu geringere Werte für X - und damit in Relation zu viel Gew.-% Vorvernetzer - kann zu schlechte- rer Lagerstabilität führen, aufgrund der Gefahr, dass ein Schmelzklebelack bereits vor Verwendung gelieren könnte, was bereits die Aufbringung des Schmelzklebelacks erschweren würde. Zu hohe Werte von X - und damit in Relation zu wenig Gew.-% an Vorvernetzer - kann unter anderem dazu führen, dass ein zu geringer Grad an Vorvernetzung erreicht wird, der Schmelzklebelack zu niederviskos ist und damit nicht mehr ausfließstabil ist. 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. The larger the value for X, the lower the mass of precrosslinker in relation to the epoxy resin or to the mixture of epoxy resins. Lower values for X - and thus in relation to much wt .-% precrosslinker - can lead to poorer storage stability, due to the risk that a hot melt adhesive could gel before use, which would complicate the application of the hot melt adhesive. Excessively high values of X - and thus in relation to a small amount by weight of precrosslinker - can, inter alia, result in too low a degree of pre-crosslinking, if the hot-melt adhesive lacquer is too low-viscosity and thus no longer flow-stable.
In einem bevorzugten Ausführungsbeispiel 1 ist ein Elektroband oder -blech mit einer thermohärtbaren wasserbasierten Schmelzklebelackschicht beschichtet, welche Schmelzklebelackschicht 100 Gramm aufweist: 50 Gramm eines Epoxidharzes mit einer mittleren molaren Masse von 2000 g/mol, In a preferred exemplary embodiment 1, 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,
5,0 Gramm Dicyandiamid als latentem Härter,  5.0 grams of dicyandiamide as a latent hardener,
1 ,0 Gramm Triamin als Vorvernetzer mit einer mittleren molaren Masse von 440 g/mol, nämlich einem Polyoxypropylentriamin der nachstehenden Struk- turformel mit drei primären Aminogruppen auf, welche an sekundären Kohlen- stoffatomen endständiger Ethergruppen gebunden sind,  1, 0 grams of triamine as a precrosslinker having an average molar mass of 440 g / mol, namely a Polyoxypropylentriamin the following structural formula with three primary amino groups, which are bonded to secondary carbon atoms of terminal ether groups,
10 Gramm 1 -Methoxy-propanol als Co-Löser und  10 grams of 1-methoxy-propanol as co-solvent and
als Rest Wasser.  as rest water.
Weitere Zusatzstoffe und/oder Hilfsstoffe sind denkbar. Further additives and / or auxiliaries are conceivable.
Zudem erfüllen die Gew.-% von Vorvernetzer und Epoxidharz oder Mischung aus Epoxidharzen in der thermohärtbaren Schmelzklebelackschicht die Relation: In addition, the wt .-% of precrosslinker and epoxy resin or mixture of epoxy resins in the thermosetting hot melt adhesive layer meet the relation:
Gew.-% Vorvernetzer = Wt .-% precrosslinker logo CNRS logo INIST
Gew.— % Epoxidharz oder % By weight of epoxy resin or
der Mischung aus Epoxidharzen mittlere M des Vorvernetzers the mixture of epoxy resins average M of the precrosslinker
mittlere M des Epoxidharzes oder X * mittlere Anzahl der Aminogruppen der der Mischung aus Epoxidharzen Vorvernetzermoleküle wobei M für molare Masse steht. Für X ergibt sich im Ausführungsbeispiel 1 der Wert 3,67 - welcher Wert auch in den als besonders bevorzugt beanspruchten Bereich 2,9 bis 7,2 fällt. Übliche Schichtdicken für Stahlbänder weisen eine Dicke von 4 miti bis 16 miti für den Nasslack auf, im getrockneten Zustand beträgt dies in etwa 2 miti bis 8 miti. Wobei etwa 10 g / m2 / Bandseite für eine Schichtdicke von 5 miti im getrockneten Zustand entsprechen (also etwa 10 miti Nasslackdicke). average M of the epoxy resin or X * average number of amino groups of the mixture of epoxy resins Vorvernetzermoleküle wherein M is molar mass. In the case of X, in the exemplary embodiment 1 the value 3.67 results-which value also falls in the range 2.9 to 7.2 claimed as being particularly preferred. Conventional layer thicknesses for steel strips have a thickness of 4 to 16 miti for the wet paint, in the dried state, this is about 2 miti to 8 miti. Wherein about 10 g / m 2 / band side for a layer thickness of 5 miti in the dried state correspond (ie about 10 miti wet paint thickness).
Durch diese Zusammensetzung kann ein besonderer Zustand der Schmelzklebelack- schicht eingestellt werden. Die primären Aminogruppen des Triamins reagieren näm- lich zumindest bei Raumtemperatur mit reaktiven Epoxidgruppen des Epoxidharzes zu sekundären und tertiären Aminen. Somit ergeben sich vergleichsweise voluminöse Verbindungen in der thermohärtbaren wasserbasierten Schmelzklebelackschicht bzw. führt dies zu einer Molmassenvergrößerung. 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.
Das erfindungsgemäße Verhältnis von Aminogruppen und Epoxidgruppen ist zudem ideal, um einen Grad an Vorvernetzung zu erreichen, welcher weiträumig genug ist, ein Gelieren des wasserbasierten Schmelzklebelacks nicht zu verursachen. 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.
Solch ein Schmelzklebelack verfügt bei Raumtemperatur über eine hohe Lagerstabi- lität, ohne dass dabei dessen Eigenschaften bezüglich Klebefähigkeit bzw. Haftfes- tigkeit auf dem Elektroband oder -blech beeinträchtigt werden. Beispielsweise kann damit eine Lagerfähigkeit von 6 Monaten problemlos ermöglicht werden. Demnach ist sohin eine einfache Handhabung der wasserbasierten thermohärtbaren Schmelz- klebelacks gegeben.  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.
Der Vorvernetzer des Ausführungsbeispiels 1 zeigt eine weitere vorteilhafte Eigen- schaft, nämlich eine sterische Hinderung auf den, die Aminogruppe tragenden Koh- lenstoff. Dies ergibt sich dadurch, dass die Aminogruppe des Polyethertriamins an einem sekundären Kohlenstoffatom einer endständigen Ethergruppe gebunden ist. Dies beeinflusst die Reaktivität der Aminogruppe. Insbesondere senkt es die Neigung einer sekundären Aminogruppe des Vorvernetzers - also einer Aminogruppe, welche bereit eine Verbindung mit einem Epoxidharzmolekül eingegangen ist - mit einem zweiten Epoxidharzmolekül zur Ausbildung einer tertiären Aminogruppe zu reagieren. Derart ist es also nicht nur der Grad der Vorvernetzung besonders leicht einstellbar, die Schmelzklebelackschicht ist auch vergleichsweise lagerstabil. Diese ist bei Raum- temperatur selbst über einen Zeitraum von sechs Monaten gegeben. 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.
Überraschend hat sich auch gezeigt, dass eine besonders gute Haftfestigkeit der er- findungsgemäßen Schmelzklebelackschicht auf einem Elektroband oder -blech er- reicht wird. Surprisingly, it has also been found that a particularly good adhesive strength of the hotmelt adhesive lacquer layer according to the invention on an electrical steel strip or sheet is achieved.
Die erfindungsgemäße Schmelzklebelackschicht auf dem Elektroband oder -blech wird bei einer Bandtemperatur von 220°C getrocknet - somit werden Wasser und Co- Löser, also 1 -Methoxy-propanol, aus der Schmelzklebelackschicht ausgetrieben. Nach diesem Vorgang bildet sich die getrocknete thermohärtbare Schmelzklebelack- schicht des Ausführungsbeispiels 1 aus  The hot-melt adhesive lacquer layer according to the invention on the electrical steel strip or sheet is dried at a strip temperature of 220 ° C. - thus water and co-solvent, ie 1-methoxy-propanol, are expelled from the hot melt adhesive layer. After this process, the dried thermosetting Schmelzkleklackack layer of the embodiment 1 forms
89 Gew.-% Epoxidharz  89 wt .-% epoxy resin
8,9 Gew.-% Dicyandiamid als latentem Härter und  8.9 wt .-% dicyandiamide as a latent hardener and
2,1 Gew.-% Triam in als Vorvernetzer  2.1% by weight of triamine as precrosslinker
Es ist davon auszugehen, dass die Aminogruppen des Vorvernetzers jeweils mit zu- mindest einer Epoxidgruppe unterschiedlicher Epoxidharzmoleküle des Epoxidhar- zes reagieren.  It can be assumed that the amino groups of the precrosslinker react with at least one epoxide group of different epoxy resin molecules of the epoxy resin.
Erfindungsgemäß ist eine erhöhte Antrocknungsgeschwindigkeit der Schmelzklebe- lackschicht auf dem Elektroband oder -blech zu beobachten. Außerdem zeichnet sich diese getrocknete, thermohärtbare Schmelzklebelackschicht durch eine hohe Härte bei gleichzeitig sehr guter Elastizität aus. Die verbesserte Zähigkeit ist von besonders hoher Bedeutung - in Kombination mit der ausgezeichneten Haftfestigkeit der ge- trockneten thermohärtbaren Schmelzklebelackschicht auf dem Elektroband oder - blech ergeben sich maßgebliche Verbesserungen hinsichtlich des Rollschälwider- stands.  According to the invention, an increased rate of drying of the hot-melt adhesive layer on the electrical steel strip or sheet is to be observed. In addition, this dried, 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.
Zum Nachweis der Verbesserung des Rollschälwiderstands werden die Vergleichs- ergebnisse von 3 Proben gezeigt. To demonstrate the improvement of the roller peel resistance, the comparative results of 3 samples are shown.
Probe 1 : Stand der Technik Sample 1: prior art
Die Zusammensetzung der thermohärtbaren Schmelzklebelackschicht von Probe 1 entspricht einem herkömmlichen kommerziell erhältlichen Backlack. Probe 2: Stand der Technik The composition of the thermosetting hot melt adhesive layer of Sample 1 corresponds to a conventional commercially available baked enamel. Sample 2: State of the art
Die Zusammensetzung der thermohärtbaren Schmelzklebelackschicht von Probe 2 entspricht der dem erfindungsgemäßen Ausführungsbeispiel 1 (Probe 3) allerdings ohne Zugabe des Vorvernetzers.  The composition of the 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.
Probe 3: Ausführungsbeispiel 1 Sample 3: Embodiment 1
Die Zusammensetzung der thermohärtbaren Schmelzklebelackschicht entspricht je- ner des erfindungsgemäßen Ausführungsbeispiels 1 . Dieses wurde in einer Schicht- dicke von 5 pm auf ein siliziumlegiertes (etwa 3 % Si) Elektroband per Rollenapplika- tion aufgetragen und einem Trocknen bei einer Bandtemperatur (PMT - Peak Metal Temperature) von 220°C unterworfen.  The composition of the 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.
Zur Bestimmung des Rollschälwiderstands wurde das Verfahren nach der Norm EN 1464 angewandt. For the determination of the roller peel resistance the procedure according to the standard EN 1464 was used.
Für Probe 3 ist nach Tabelle 1 eine klare Erhöhung des Rollschälwiderstands erkenn- bar.  For sample 3, a clear increase in the roller peel resistance can be seen in Table 1.
Klebefestigkeit adhesion
Probe 1 Probe 2 Probe 3 Sample 1 Sample 2 Sample 3
Tabelle 1 Table 1
Ein besonderer erfindungsgemäßer Vorteil liegt in der Einsteilbarkeit der Schmelzvis- kosität der getrockneten thermohärtbaren Schmelzklebelackschicht beim Aushärten. Dies wird insbesondere aufgrund der speziellen Vorvernetzung durch die erfindungsgemäße Relation der Gew.-% von Vorvernetzer und Epoxidharz in der thermohärtbaren Schmelzklebelackschicht erreicht. Damit kann die Gefahr des Aus- fließens von Schmelzklebelack im Backprozess stoffschlüssig zu verbindender, mit Schmelzklebelack beschichteter Elektrobänder oder -bleche bzw. aus solchen herge- stellter Blechteile reduziert werden. 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.
Dies gelingt ohne nachteilige Beeinflussung hinsichtlich der Stabilität und Dispersion bzw. der Handhabung des Schmelzklebelacks, z. B. beim Aufbringen der Schmelz- klebelackschicht. Überraschend ist dies unter anderem deshalb, weil -trotz eines wei- teren, wenn auch bei Raumtemperatur latenten, Härters- mithilfe eines Vorvernet- zers, welcher sich bei Raumtemperatur mit Harz verbindet, dennoch eine hohe La- gerstabilität bei Raumtemperatur gewährleistet bleibt und sich auch keinen negativen Effekte durch das Trocken der thermohärtbaren Schmelzklebelackschicht auf dem Elektroband oder -blech bezüglich der weiteren Verwendung ergeben. This is possible without adversely affecting the stability and dispersion or the handling of the hot melt adhesive, z. B. when applying the melt adhesive lacquer layer. This is surprising, among other things, because despite a further hardener, even if it is latent at room temperature, a high storage stability at room temperature nevertheless remains guaranteed and also does so with the aid of a precrosslinker which combines with resin at room temperature do not give rise to any negative effects due to the drying of the thermosetting melt adhesive lacquer layer on the electrical steel strip or sheet with regard to further use.
Bereits -gegenüber den erfindungsgemäßen Grenzen- geringfügig erhöhte Gew.-% des Vorvernetzers führen nicht nur zu einer massiven Verschlechterung der Lager- stabilität des thermohärtbaren wasserbasierten Schmelzklebelacks, sondern erhöhen die Schmelzviskosität der getrockneten thermohärtbaren Schmelzklebelackschicht auf dem Elektroband oder -blech in einem Ausmaß, welches seine Klebekraft in ei- nem inakzeptablen Ausmaß verschlechtert. In contrast to the limits according to the invention, 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.

Claims

P a t e n t a n s p r ü c h e: Patent claim:
1 . Elektroband oder -blech mit wenigstens einer auf einer seiner Flachseiten vor gesehenen, thermohärtbaren wasserbasierten Schmelzklebelackschicht, welche ein Epoxidharz oder eine Epoxidharzmischung und mindestens einen Härter aufweist, dadurch gekennzeichnet, dass die thermohärtbare wasserbasierte Schmelzklebe lackschicht zusätzlich einen mit dem Epoxidharz oder einer Mischung aus Epoxidhar zen verbindenden Vorvernetzer aufweist, wobei der Vorvernetzer ein organisches Amin mit drei Aminogruppen, nämlich ein organisches Triamin, oder eine Mischung solcher organischer Amine ist. 1 . Electrical strip or sheet with at least one on one of its flat sides before seen thermohärtbaren water-based hot melt adhesive layer having an epoxy resin or an epoxy resin mixture and at least one curing agent, characterized in that the thermosetting water-based hot melt adhesive layer additionally zen with the epoxy resin or a mixture of Epoxidhar wherein the precrosslinker is an organic amine having three amino groups, namely an organic triamine, or a mixture of such organic amines.
2. Elektroband oder -blech nach Anspruch 1 , dadurch gekennzeichnet, dass die drei Aminogruppen des Vorvernetzers jeweils primäre Aminogruppen sind. 2. electrical strip or sheet according to claim 1, characterized in that the three amino groups of the precrosslinker are each primary amino groups.
3. Elektroband oder -blech nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Gew.-% von Vorvernetzer und Epoxidharz oder Epoxidharzmischung in der wasserbasierten thermohärtbaren Schmelzklebelackschicht folgende Relation erfül len: 3. electrical steel strip or sheet according to claim 1 or 2, characterized in that the wt .-% of precrosslinker and epoxy resin or epoxy resin mixture in the water-based thermosetting melt adhesive lacquer layer following relationship fulfill:
Gew.-% Vorvernetzer = Wt .-% precrosslinker logo CNRS logo INIST
Gew. % Epoxidharz oder Wt.% Epoxy resin or
der Mischung aus Epoxidharzen mittlere M des Vorvernetzers  the mixture of epoxy resins average M of the precrosslinker
mittlere M des Epoxidharzes oder X * mittlere Anzahl der Aminogruppen der der Mischung aus Epoxidharzen Vorvernetzermoleküle wobei  average M of the epoxy resin or X * average number of amino groups of the mixture of epoxy resins Vorvernetzermoleküle where
X für eine Zahl von 1 ,6 bis 28,9, insbesondere 2,1 bis 19,4, insbesondere 2,9 bis 7,2, und  X is a number from 1, 6 to 28.9, in particular 2.1 to 19.4, in particular 2.9 to 7.2, and
M für molare Masse steht.  M stands for molar mass.
4. Elektroband oder -blech nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass der Vorvernetzer ein Polyethertriamin, vorzugsweise ein Polyoxypropylentria- min, ist. 4. electrical steel strip or sheet according to claim 1, 2 or 3, characterized in that the precrosslinker is a polyether triamine, preferably a Polyoxypropylentria- min is.
5. Elektroband oder -blech nach Anspruch 4, dadurch gekennzeichnet, dass eine, insbesondere alle, Aminogruppen des Polyethertriamins an sekundären Kohlenstoff atomen endständiger Ethergruppen gebunden sind. 5. electrical steel strip or sheet according to claim 4, characterized in that one, in particular all, amino groups of the polyether triamine are bonded to secondary carbon atoms terminal ether groups.
6. Elektroband oder -blech nach einem der Ansprüche 1 bis 5, dadurch gekenn zeichnet, dass das Epoxidharz oder die Mischung aus Epoxidharzen eine Bisphenol- A-Basis aufweist. 6. electrical steel strip or sheet according to one of claims 1 to 5, characterized in that the epoxy resin or the mixture of epoxy resins has a bisphenol A base.
7. Elektroband oder -blech nach einem der Ansprüche 1 bis 6, dadurch gekenn zeichnet, dass die thermohärtbare Schmelzklebelackschicht einen bei Raumtempe ratur latenten Härter auf Cyanamidbasis, insbesondere aus Dicyandiamid bestehend, aufweist. 7. electrical steel strip or sheet according to one of claims 1 to 6, characterized in that the thermosetting melt adhesive lacquer layer has a cyanamide-based latent hardener at room temperature tempering, in particular consisting of dicyandiamide.
8. Elektroband oder -blech nach einem der Ansprüche 1 bis 7, dadurch gekenn zeichnet, dass die thermohärtbare wasserbasierte Schmelzklebelackschicht 8. electrical steel strip or sheet according to one of claims 1 to 7, characterized in that the thermosetting water-based hot melt adhesive lacquer layer
35 bis 55 Gew.-%, insbesondere 40 bis 50 Gew.-%, eines Epoxidharzes oder einer Mischung aus Epoxidharzen mit einer mittleren molaren Masse von 1500 bis 2000 g/mol und 35 to 55 wt .-%, in particular 40 to 50 wt .-%, of an epoxy resin or a mixture of epoxy resins having an average molar mass of 1500 to 2000 g / mol and
0,1 bis 2 Gew.-%, insbesondere 0,2 bis 1 ,0 Gew.-%, Triamin als Vorvernetzer mit einer mittleren molaren Masse von 350 bis 550 g/mol aufweist. 0.1 to 2 wt .-%, in particular 0.2 to 1, 0 wt .-%, triamine as a precrosslinker having an average molar mass of 350 to 550 g / mol.
9. Elektroband oder -blech nach Anspruch 8, dadurch gekennzeichnet, dass die thermohärtbare wasserbasierte Schmelzklebelackschicht 9. electrical steel strip or sheet according to claim 8, characterized in that the thermosetting water-based hotmelt adhesive layer
2 bis 10 Gew.-%, insbesondere 3 bis 8 Gew.-%, eines latenten Härters auf Cyanamidbasis, insbesondere Dicyandiamid, aufweist. 2 to 10 wt .-%, in particular 3 to 8 wt .-%, of a cyanamide-based latent curing agent, in particular dicyandiamide having.
10. Elektroband oder -blech nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass die thermohärtbare wasserbasierte Schmelzklebelackschicht als Rest Wasser sowie, insbesondere 4 bis 20 Gew.-%, Co-Löser, vorzugsweise 1 -Methoxy-propanol als Co-Löser, aufweist. 10. electrical steel strip or sheet according to claim 8 or 9, characterized in that the thermosetting water-based hot melt adhesive lacquer layer as the remainder water and, in particular 4 to 20 wt .-%, co-solubilizer, preferably 1-methoxy-propanol as co-solubilizer ,
1 1. Elektroband oder -blech nach einem der vorangegangenen Ansprüche, deren thermohärtbare Schmelzklebelackschicht getrocknet ist. 1 1. electrical steel strip or sheet according to one of the preceding claims, the thermosetting hot melt adhesive layer is dried.
12. Elektroband oder -blech nach einem der Ansprüche 1 bis 7, dadurch gekenn zeichnet, dass die getrocknete thermohärtbare Schmelzklebelackschicht aufweist: 12. electrical steel strip or sheet according to one of claims 1 to 7, characterized in that the dried thermosetting melt adhesive lacquer layer comprises:
75 bis 92,8 Gew.-%, insbesondere 80 bis 90 Gew.-%, eines Epoxidharzes oder einer Mischung aus Epoxidharzen mit einer mittleren molaren Masse von 1500 bis 2000 g/mol,  From 75 to 92.8% by weight, in particular from 80 to 90% by weight, of an epoxy resin or a mixture of epoxy resins having an average molar mass of from 1500 to 2000 g / mol,
4 bis 24,8 Gew.-%, insbesondere 7 bis 12 Gew.-%, Härter, insbesondere Dicyanamid,  From 4 to 24.8% by weight, in particular from 7 to 12% by weight, of hardener, in particular dicyanamide,
0,2 bis 4 Gew.-%, insbesondere 0,4 bis 2 Gew.-%, Triamin als Vorvernetzer mit einer mittleren molaren Masse von 350 bis 550 g/mol.  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.
13. Verfahren zur Herstellung eines Elektrobands oder -blechs nach einem der vo rangegangenen Ansprüche, durch Aufbringen, insbesondere Rollenapplikation oder Aufsprühen, des thermohärtbaren wasserbasierten Schmelzklebelacklacks auf min destens eine Flachseite des Elektrobands oder -blechs. 13. A method for producing an electrical tape or sheet according to one of vo voiced claims, by applying, in particular roll application or spraying, the thermosetting water-based hot melt adhesive lacquer on min least one flat side of the electrical tape or sheet.
14. Verfahren zur Herstellung eines Blechpakets mit einem Elektroband oder - blech nach Anspruch 13, umfassend 14. A method for producing a laminated core with an electrical steel strip or - sheet according to claim 13, comprising
Trocknung der Schmelzklebelackschicht, insbesondere bei 180 bis 280°C Bandtemperatur,  Drying of the hotmelt adhesive lacquer layer, in particular at 180 to 280 ° C. strip temperature,
Abtrennen von Blechteilen aus dem Elektroband oder -blech,  Separating sheet metal parts from the electrical steel strip or sheet,
Stapeln der Blechteile zu einem Blechpaket,  Stacking the sheet metal parts into a laminated core,
Verkleben des Blechpakets, insbesondere durch thermisches Aktivieren der Schmelzklebelackschicht, bevorzugt bei 100°C bis 250°C.  Gluing the laminated core, in particular by thermal activation of the hot melt adhesive layer, preferably at 100 ° C to 250 ° C.
15. Blechpaket, hergestellt nach einem Verfahren nach Anspruchs 14. 15. laminated core, produced by a method according to claim 14.
16. Blechpaket aus einem Elektroband oder -blech nach einem der Ansprüche 1 bis 12, deren thermohärtbare Schmelzklebelackschicht nach einem der Verfahren nach Anspruch 13 oder 14 getrocknet und ausgehärtet ist. 16. laminated core from an electrical steel strip or sheet according to one of claims 1 to 12, the thermosetting hot melt adhesive layer is dried and cured by one of the method according to claim 13 or 14.
EP19730262.3A 2018-05-18 2019-05-20 Electrical steel strip or sheet, method for producing such an electrical steel strip or sheet, and lamination stack made therefrom Pending EP3793824A1 (en)

Applications Claiming Priority (2)

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EP18173378.3A EP3569405A1 (en) 2018-05-18 2018-05-18 Magnetic circuit band or sheet, method for manufacturing such a magnetic circuit band or sheet and stack of same
PCT/EP2019/063010 WO2019219983A1 (en) 2018-05-18 2019-05-20 Electrical steel strip or sheet, method for producing such an electrical steel strip or sheet, and lamination stack made therefrom

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EP3793824A1 true EP3793824A1 (en) 2021-03-24

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EP18173378.3A Withdrawn EP3569405A1 (en) 2018-05-18 2018-05-18 Magnetic circuit band or sheet, method for manufacturing such a magnetic circuit band or sheet and stack of same
EP19730262.3A Pending EP3793824A1 (en) 2018-05-18 2019-05-20 Electrical steel strip or sheet, method for producing such an electrical steel strip or sheet, and lamination stack made therefrom

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

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