EP2285926A1 - Thermoplastes étirés pour collage de pièces métalliques sur des matières plastiques, des verres, et des métaux, et leur procédé de fabrication - Google Patents

Thermoplastes étirés pour collage de pièces métalliques sur des matières plastiques, des verres, et des métaux, et leur procédé de fabrication

Info

Publication number
EP2285926A1
EP2285926A1 EP09782188A EP09782188A EP2285926A1 EP 2285926 A1 EP2285926 A1 EP 2285926A1 EP 09782188 A EP09782188 A EP 09782188A EP 09782188 A EP09782188 A EP 09782188A EP 2285926 A1 EP2285926 A1 EP 2285926A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
thermoplastic
stretched
heat
component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09782188A
Other languages
German (de)
English (en)
Inventor
Marc Husemann
Matthias Koop
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.)
Tesa SE
Original Assignee
Tesa SE
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
Priority claimed from DE102008060415A external-priority patent/DE102008060415A1/de
Priority claimed from DE200910014387 external-priority patent/DE102009014387A1/de
Application filed by Tesa SE filed Critical Tesa SE
Publication of EP2285926A1 publication Critical patent/EP2285926A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps
    • 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
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
    • 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
    • C09J7/22—Plastics; Metallised plastics
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/04—Polyesters derived from hydroxycarboxylic acids
    • B29K2067/046—PLA, i.e. polylactic acid or polylactide
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • 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
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • 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
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • 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
    • C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Definitions

  • double-sided pressure-sensitive adhesive tapes are usually used.
  • the adhesive forces required for this purpose are sufficient for fixing and fastening the metal components on the plastics.
  • the metals used are preferably steel, stainless steel and steel with chromations.
  • the plastics used are, for example, PVC, ABS, PC, PPA, PA or blends based on these plastics.
  • the demands are constantly increasing. On the one hand, these articles are getting smaller and smaller, so that also the bonding surfaces are getting smaller.
  • the bonding has to meet additional requirements, since portable articles are used in a wider temperature range and can also be subjected to mechanical stress such as impacts, falls, etc. These conditions are particularly problematic for metal bonding on plastics.
  • the stretching in the temperature range of the crystalline melting region of the thermoplastic can be carried out with subsequent cooling of the flat, stretched adhesive or c) the stretching can be carried out at a temperature below the crystallite melting range of the thermoplastic.
  • the crystalline melting range is defined as the onset temperature at which the peak begins to form in the DSC.
  • the stretching is carried out at a temperature or in a temperature range above the crystallite melting temperature as melt stretching.
  • the stretching takes place, for example, in a slot die, such as a slot die and / or between slot die and support point and / or on the cooling roll by rollers, which have a different speed.
  • the generated anisotropic orientation is then by means of the cooling roller in this state by cooling the stretched Thermoplastics frozen. It can be cooled to or below the crystallization temperature.
  • the cooling can be done in any way imaginable, for example, as mentioned by active cooling by cooling rollers but also a slow cooling over a longer period may be appropriate.
  • Increasing the orientation of the polymer chains during the stretching results in an increase in the enthalpy of fusion, in particular if this state can essentially be fixed.
  • Proper process control results in at least about 30% increase in the enthalpy of fusion of the stretched thermoplastic relative to the extruded unstretched thermoplastic and preferred process guides increase the enthalpy of fusion of the thermoplastic after stretching by at least 40% above the enthalpy of fusion of the unstretched state.
  • Particularly preferred process conditions require an increase in the enthalpy of fusion of preferably by 60% above the enthalpy of fusion of the unstretched state. In extreme cases, values above 100% can also be realized.
  • the invention likewise relates to a stretched, flat adhesive having at least one heat-activatable polymeric thermoplastic, wherein the stretched thermoplastic is present in particular as a film or films, and optionally provided with at least one carrier, wherein the enthalpy of fusion of the particular extruded and stretched thermoplastics by at least 30 % with respect to the corresponding unstretched, in particular extruded, thermoplastic, in particular, the enthalpy of fusion is at least 40% to 100%, preferably at least 60% to 100%, particularly preferably from 50% to 70% with respect to the corresponding unstretched Thermoplastics increased.
  • Suitable carriers are conventional release films or papers, which are usually provided with a release agent, in particular as a release layer or release coating, for the reversible connection of the thermoplastic with the carrier.
  • the supports may include conventional supports as discussed below.
  • an object of the invention is a stretched, flat adhesive of a defined shape, in particular in the form of a stamped or cut or cut by laser cutting process form.
  • the two-dimensional adhesive is preferably present as a film, foil or as a coating.
  • thermoplastics for the preparation of heat-activatable adhesives according to the invention in the form of films or films, it is generally possible first of all to use all suitable thermoplastics which undergo heat activation for Bonding can be used as well as orienting under stretching and can form crystalline areas.
  • poly- ⁇ -olefins are used.
  • Various heat-activatable poly- ⁇ -olefins are commercially available from Degussa under the trade name Vestoplast TM.
  • thermoplastic (soluble) resins can be used, in particular, it is referred to all aliphatic, aromatic, alkylaromatic hydrocarbon resins, hydrocarbon resins based on pure Monomers, hydrogenated hydrocarbon resins, functional hydrocarbon resins and natural resins.
  • aliphatic, aromatic, alkylaromatic hydrocarbon resins hydrocarbon resins based on pure Monomers
  • hydrogenated hydrocarbon resins functional hydrocarbon resins and natural resins.
  • reactive resins and melamine resins can be used as reactive resins and melamine resins, such. Cymel TM 327 and 323 from Cytec.
  • reactive resins it is also possible to use terpene-phenolic resins, e.g. Use NIREZ TM 2019 from Arizona Chemical.
  • reactive resins may also be phenolic resins, e.g. YP 50 from Toto Kasei, PKHC from Union Carbide Corp. And BKR 2620 from Showa Union Gosei Corp. deploy. It is also possible to use reactive resins based on polyisocyanates, such as, for example, Coronate TM L from Nippon Polyurethane Ind., Desmodur TM N3300 or Mondur TM 489 from Bayer.
  • fillers such as fibers, carbon black, zinc oxide, titanium dioxide, chalk, solid or hollow glass spheres, microspheres made of other materials, Silicic acid, silicates; or nucleating agents, blowing agents, compounding agents, adjuvants and / or anti-aging agents, for example in the form of primary and secondary antioxidants or in the form of light stabilizers.
  • the fillers are preferably added before or during the extrusion, in particular the thermoplastic and / or the blend. For example, prior to the extrusion, mixing can take place in a twin-screw extruder.
  • the thermoplastic heat-activable surface adhesive in particular as an adhesive film, can already be pre-oriented in the nozzle. This process is influenced by the nozzle design within the coating die. After the nozzle exit, the stretching process can take place at the nozzle exit. The stretching process or the stretching causes the stretching of the flat adhesive to form the stretched, flat adhesive.
  • the stretching ratio can be controlled, for example, by the width of the die gap.
  • the stretched, sheeted adhesive is placed on a substrate to be coated to form a stretched, sheeted adhesive with backing.
  • an extrusion die is preferably used.
  • the extrusion dies used can come from one of the following three categories: T-die, fishtail die and stirrup nozzle. The individual types differ in the shape of their flow channel. These forms of the extrusion nozzle can be used to create an orientation within the hotmelt adhesive. In the event that two-layer or multi-layer thermoplastic heat-activatable films are to be produced, coextrusion nozzles can also be used.
  • carrier material for example for the construction of primer / barrier layer / carrier, it is generally possible to use all conventional materials which are familiar to the person skilled in the art for this purpose, but these are, for example, not restrictive: films, in particular of polyester, PET, PE, PP, BOPP, PVC, polyimide, polymethacrylate, PEN, PVB, PVF, polyamide; or also nonwovens, foams, fabrics and fabric films which may also be based on these materials.
  • polymeric or prepolymeric compounds which are familiar and suitable to the person skilled in the art, in particular compounds having carboxylic acid groups themselves.
  • exemplary and suitable polymers are polyurethanes, polyurethane / acrylate copolymers, copolymers or terpolymers of polyalkylenes, polyalkyldienes, polyacrylate esters, polyalkyl esters, polyvinyl esters, polyvinyls with acrylic acid or methacrylic acid.
  • copolymers such as polymers based on polyethylene / acrylic acid copolymer, polyethylene / methacrylic acid copolymer, polyethylene / methacrylic acid / acrylic acid terpolymer, methyl methacrylate / acrylic acid copolymers, polybutadiene / methacrylic acid copolymers, vinyl chloride / acrylic acid copolymers, and / or mixtures thereof.
  • Preferred polymers and / or copolymers used are based on polyurethanes, polyethylene / acrylic acid copolymer and / or polyethylene / methacrylic acid copolymer.
  • the properties of the polymers and / or copolymers can be varied by the choice of the number of carboxylic acid groups.
  • Suitable crosslinkers include, but are not exhaustive, polyfunctional aziridines, multifunctional carbodiimides, multifunctional epoxies, and melamine resins.
  • the preferred crosslinkers are polyfunctional aziridines, e.g. Trimethylpropane tris- (B- (N-aziridinyl) propionate, pentaerythritol tris- (B-
  • thermoplastic heat-activated stretched, flat adhesive or the sheet adhesive in particular as a film or film
  • temporary carrier materials for the thermoplastic heat-activated stretched, flat adhesive or the sheet adhesive in particular as a film or film
  • films for example based on polyester, PET, PE, PP, BOPP, PVC Polyimide; or nonwovens, foams, woven and nonwoven sheets, which may also be based on said polymers, and release paper based on glassine, HDPE and / or LDPE.
  • the support materials are equipped with a release layer.
  • the release layer has a silicone release varnish or a fluorinated release varnish; the release layer preferably consists of at least one of these varnishes.
  • a metal-containing body with a body based on plastic, a glass body and / or a metal-containing body, in particular using heat and optionally under pressure, are bonded during the bonding process.
  • the invention also relates to the bonding of glass bodies, the bonding of bodies based on plastics or else the bonding of a glass body to a body based on a plastic.
  • the stainless steels can be brushed, or provided with a protective lacquer or color coat.
  • Further customary surface modifications are anodizations, chromations, chromitization or chromating.
  • metallizations come into consideration, for example for the passivation of the surfaces. This is usually done with gold or silver, which are applied in particular as a coating. Other surface modifications may be due to the oxidation of the metallic surface.
  • multi-layer metals can be used.
  • the metal parts or parts that are to be bonded may generally be any size and / or shape, such as flat, for example, as films, films, sheets, such as a stamped or laser formed; or be formed in three dimensions.
  • the applications of the parts to be bonded or bonded metal parts or metal-containing parts are not limited, they can be used as a decorative element, as stiffening support, frame components, covers, as an information carrier, hanger, component, etc.
  • a component to be bonded in particular a first component, more preferably on a metal-containing component, preferably also on a component containing plastic and / or glass,
  • the composite is isolated and sold separately, for example, to processors, or it takes place
  • stamped blanks of the thermoplastic heat-activated stretched, flat adhesive preferably in the form of a film or a film
  • These are usually by laser cutting, or by Flat bed stamping or by rotary die cutting.
  • the diecut can be placed manually on the metal part, for example by means of tweezers.
  • the stamped usually has the dimension of the metal part, but it can also be made slightly smaller to compensate for slight Ausquetschpreheate, processes during the bonding process. This does not lead to visually undesirable visible oozing. Alternatively, it may be necessary for structural reasons to use full-surface diecuts.
  • thermoplastic heat-activatable adhesive tape diecut comprising a stretched, flat adhesive
  • a heat source after manual positioning; this can be done, for example, with an iron in the simplest case.
  • the adhesive becomes sticky or sticky and the adhesion to the metal increases.
  • a punched product equipped with a temporary carrier material is preferably used.
  • the amount of heat must be accurately metered, especially to substantially maintain the orientation of the thermoplastic in the adhesive during prelamination.
  • the amount of heat must be well dosed and the temperature reached should be at most 10 0 C above the temperature required to secure adherence of the adhesive, in particular the film to the component, preferably a metal component guarantee.
  • the prelamination temperature should not exceed the onset temperature of the crystallite melting range as measured by DSC.
  • the composite in particular comprising a metal component with a stamped sheet of heat-activable laminar adhesive, such as a film, on the second component, preferably on a plastic component, glass component and / or metal component,
  • the mold component used to hold the components should also be made of heat-resistant material.
  • Corresponding materials are, for example, metals or alloys of metals.
  • plastics or suitable composite materials for example fluorinated polymers or thermosets, which at the same time have a good hardness and are difficult to deform.
  • pressure and temperature are applied. This is done by means of a Schustkovs of a material with good thermal conductivity. Common materials include copper, brass, bronze or aluminum. But it can also be used other alloys.
  • the hot stamping die should preferably assume the shape of the upper side of the metal part, for example in the form of a negative mold.
  • This shape can be present as 2-dimensional or 3-dimensional.
  • the pressure is applied by means of a printing cylinder.
  • the application does not necessarily have to be done via air pressure.
  • the hot stamping dies do not all have to be operated at the same temperature and / or pressure.
  • the temperature and / or the pressure may initially increase and, if appropriate, subsequently decrease again.
  • the contact time of the stamp can be chosen differently.
  • it may be advantageous, in a last step to apply only pressure with a non-tempered stamp or, for example, with a cooled stamp, for example a press die cooled to room temperature.
  • the thermoplastic heat-activated stretched sheet adhesive in step 4, has a reduced squeezing behavior than a corresponding non-stretched adhesive.
  • the Ausquetsch the adhesive according to the invention is, with otherwise substantially the same, preferably under identical process parameters, such as temperature, pressure and / or time, by 2 to 25%, in particular reduced by at least 10%, preferably by at least 20% or reduced, in particular Reference to extruded, corresponding non-stretched thermoplastics or laminar adhesives.
  • a stamped product according to the invention has a reduced squeezing behavior due to the orientation of the thermoplastic heat-activable sheet-like adhesive formed and / or frozen in the production process, which is present in particular in the form of a film.
  • the heat input is chosen to be as low as possible, preferably at room temperature, so that the orientation introduced for the bonding step in the production process, in particular by the orientation, is substantially retained.
  • the bonding step a part of the introduced heat is now not only absorbed during the bonding, but can also be consumed for a regression of the orientation and / or melting processes.
  • the stamped body retains improved dimensional stability during bonding. This is especially true in the bonding of visible components, such as decorative elements, since otherwise adhesive residues are visible at unwanted locations.
  • the stamped bodies of the heat-activatable films according to the invention having a reduced squeezing behavior, the diecut shape, in particular the area, can be selected to be larger, and the geometry of the diecuts can also be changed since less space is required for unwanted material leakage. Therefore, it is also possible to dispense with the disruption within the diecuts often provided in these systems or with constructive solutions on the components, joining parts themselves, which are provided for receiving the unwanted adhesive leakage.
  • thermoplastic heat-activated stretched sheet adhesive in particular in the form of a film, is determined by the squeezing test set forth in the experimental section. After this test, the squeezing rate is determined under standard conditions.
  • the crystalline regions (b) Due to the heat input during the bonding step, in addition to a regression of the orientation (a), the crystalline regions (b) also melt and it is also possible for the phase of the water (c) contained in the thermoplastic film to change.
  • the water (c) may occur as water vapor due to the introduced high temperatures and may then cause bubbling within the film. This blistering usually has a significant negative impact on the strength of the adhesive bond.
  • the cooling step, step 5 represents an optional step that can serve to optimize bonding performance. In addition, it allows a simpler or faster removal of the bonded components.
  • a metallic press die used, the shape of which is analogous to the Schupressstempel and contains no heating element, usually the press die is not actively tempered, in particular he works at room temperature.
  • the press die can also be actively cooled, for example by a cooling system, by means of cooling means, such as air or cooling liquids. Then the ram can actively extract heat from the components.
  • the Schupressstempel for Prelaminians and bonding are operated in a temperature range of 60 to 300 0 C, depending on the temperature stability of the components and the activation and / or melting temperature of the thermoplastic heat-activated stretched, sheet-like adhesive, in particular as a film. Usual process times amount to 2.5 to 15 sec per punching step. Furthermore, it may also be necessary to vary the pressure. Due to very high pressures, the thermoplastic heat-activatable film can increasingly squeeze despite the inventive properties. Suitable pressures are in particular 1.5 to 10 bar, calculated on the bond area. Again, the stability of the materials and the flow behavior of the thermoplastic heat-activatable adhesive, in particular the film, a great influence on the particular pressure to be selected. The skilled worker is familiar with how he tunes the respective process parameters, such as time, pressure and / or temperature to the particular thermoplastic adhesive and components used.
  • FIG. 1 shows schematically the test method for verifying the Verklebefestmaschine
  • FIG. 2 shows schematically the test for measuring the bond strength.
  • Test Methods Bonding Resistance A) The bond strength is determined by a dynamic shear test. The bond area is 2 cm 2 . A 1.5 mm thick Al plate with a width of 2 cm is connected to a polycarbonate plate (PC plate) with a width of 2 cm and a layer thickness of 3 mm by means of a thermoplastic heat-activatable film according to the invention. The thermoplastic heat-activatable film was examined both in the stretched state - stretched, flat adhesive - as well as in the unrestrained state - unstretched, flat adhesive. All samples were acclimated for a further 14 days at 23 ° C and 50% humidity after coating or after stretching.
  • a 100 micron thick thermoplastic heat-activatable film is laminated using a hot 1 10 0 C hot plate on aluminum. Subsequently, the release film is peeled off. The bonding of the test specimens is carried out in a heating press (see Fig. 1), being heated over the metal 1, so the aluminum side. The heat activation is carried out with a 150 0 C hot Schupressstkov 4 at a pressure 5 of 5 bar and 5 s Verpressdauer.
  • the quality of the bond such as the appearance of bubbles, can be assessed by the transparent polycarbonate.
  • thermoplastic heat-activatable film is punched out as a circular punched product with a diameter of 29.5 mm.
  • the film is covered from both the top and bottom with a siliconized glassine liner.
  • this composite is placed in a hot press and then applied with 75 N / cm 2 and 150 0 C pressure (temperature of the hot press, heated on both sides) for 10 seconds. Due to the application of pressure, the thermoplastic squeezes out in a circular shape.
  • the Ausquetsch rate is through OR
  • the measurement of the heat of fusion was performed with the aid of Differential Scanning Calorimetry (DSC) on a Mettler DSC 822.
  • the heating rate was 10 0 C / min and it was the first heating curve in the range of -100 ° C to + 250 0 C evaluated.
  • the sample was weighed into a perforated 40 ⁇ l aluminum crucible. The Sample weight was between 10 and 15 mg.
  • the integral is formed above the melting peak and divided by the sample weight. The enthalpy of fusion is thus given in J / g.
  • the percent changes by the stretching process are simply determined by measuring the difference between the unstretched and the stretched sample.
  • the melting peak extends over a wide range. In each case the range between onset and offset temperature was evaluated. This is the area where the deviation of the DSC curve from the baseline occurs.
  • EMS Grilltech was pressed between two sheets of siliconized glassine release paper at 140 0 C to 100 microns.
  • the melting range of the polymer is between 93 ° C and 121 ° C.
  • Examples 1, 2 and 3 are examples of copolyester films which can be used as a heat-activatable film for the bonding of metal parts.
  • the films were melted in a hot press and pressed to a layer thickness of 100 microns. Due to the pressing process in the melt and the slow cooling, no orientation phenomena occur.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention porte sur un procédé de fabrication d'adhésifs étirés en pleine surface, à base de thermoplastes thermoactivables, ainsi que sur les adhésifs étirés correspondants, de même que sur leur utilisation pour coller des pièces métalliques sur des matières plastiques destinées à des articles électroniques portatifs de grande consommation. Selon l'invention, l'utilisation se fonde sur la mise en place de feuilles thermoactivables thermoplastiques spéciales pour fixer des pièces métalliques sur des pièces en matière plastique. Grâce à l'utilisation et à l'emploi de thermoplastes spécialement traités, on obtient une amélioration de la mise en œuvre, ainsi que des propriétés du collage.
EP09782188A 2008-12-05 2009-08-26 Thermoplastes étirés pour collage de pièces métalliques sur des matières plastiques, des verres, et des métaux, et leur procédé de fabrication Withdrawn EP2285926A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008060415A DE102008060415A1 (de) 2008-12-05 2008-12-05 Verstreckte Thermoplaste zur Verklebung von Metallteilen auf Kunststoffen, Gläsern und Metallen und Verfahren zu ihrer Herstellung
DE200910014387 DE102009014387A1 (de) 2009-03-26 2009-03-26 Verfahren zur Fixierung von Metallteilen auf Kunststoffen mit hitzeaktivierbaren, flächigen Haftmitteln, insbesondere mit hitzeaktivierbaren Folien
PCT/EP2009/060964 WO2010063498A1 (fr) 2008-12-05 2009-08-26 Thermoplastes étirés pour collage de pièces métalliques sur des matières plastiques, des verres, et des métaux, et leur procédé de fabrication

Publications (1)

Publication Number Publication Date
EP2285926A1 true EP2285926A1 (fr) 2011-02-23

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EP09782188A Withdrawn EP2285926A1 (fr) 2008-12-05 2009-08-26 Thermoplastes étirés pour collage de pièces métalliques sur des matières plastiques, des verres, et des métaux, et leur procédé de fabrication

Country Status (7)

Country Link
US (1) US20120003468A1 (fr)
EP (1) EP2285926A1 (fr)
JP (1) JP2012511066A (fr)
KR (1) KR20110097611A (fr)
CN (1) CN102089397A (fr)
TW (1) TW201022396A (fr)
WO (1) WO2010063498A1 (fr)

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US8899318B1 (en) 2014-04-24 2014-12-02 Ronald C. Parsons Applying an aggregate to expandable tubular
TWI667758B (zh) * 2014-11-03 2019-08-01 國立成功大學 電性連接結構及其製備方法
CN107001761B (zh) 2014-12-08 2020-06-16 3M创新有限公司 丙烯酸聚乙烯醇缩醛膜、组合物以及热粘结性制品
KR20170092652A (ko) 2014-12-08 2017-08-11 쓰리엠 이노베이티브 프로퍼티즈 캄파니 아크릴 폴리비닐 아세탈 필름 및 조성물
CN108430769B (zh) 2015-12-22 2021-07-16 3M创新有限公司 包括第二层的丙烯酸类聚乙烯醇缩醛膜
WO2017112537A1 (fr) 2015-12-22 2017-06-29 3M Innovative Properties Company Films acryliques de poly(acétal de vinyle) comprenant une couche adhésive
AU2016378200B2 (en) 2015-12-22 2019-08-15 3M Innovative Properties Company Acrylic polyvinyl acetal graphic films
CN108430766B (zh) 2015-12-22 2020-11-10 3M创新有限公司 包括结构化层的丙烯酸类膜
WO2017214007A1 (fr) 2016-06-07 2017-12-14 3M Innovative Properties Company Film de poly(acétal de vinyle) acrylique pour article dirigeant la lumière
PL422884A1 (pl) * 2017-09-18 2019-03-25 Uniwersytet Technologiczno-Przyrodniczy im. Jana i Jędrzeja Śniadeckich w Bydgoszczy Sposób i próbka do badań połączeń klejonych materiałów o różnych właściwościach fizycznych

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TW200424B (fr) * 1991-09-09 1993-02-21 Avery Dennison Corp
US5451283A (en) * 1993-07-16 1995-09-19 Avery Dennison Corporation Method of making a uniaxially oriented label film with compatibilizer
EP1617990A4 (fr) * 2003-05-01 2006-08-09 Avery Dennison Corp Film multicouche

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Title
See references of WO2010063498A1 *

Also Published As

Publication number Publication date
US20120003468A1 (en) 2012-01-05
WO2010063498A1 (fr) 2010-06-10
JP2012511066A (ja) 2012-05-17
KR20110097611A (ko) 2011-08-31
CN102089397A (zh) 2011-06-08
TW201022396A (en) 2010-06-16

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