CH669558A5 - Sandwich panels with crosslinked foamed polyethylene core - are flame treated for surface activation prior to adhesive bonding of facing layers - Google Patents

Sandwich panels with crosslinked foamed polyethylene core - are flame treated for surface activation prior to adhesive bonding of facing layers Download PDF

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Publication number
CH669558A5
CH669558A5 CH1183/86A CH118386A CH669558A5 CH 669558 A5 CH669558 A5 CH 669558A5 CH 1183/86 A CH1183/86 A CH 1183/86A CH 118386 A CH118386 A CH 118386A CH 669558 A5 CH669558 A5 CH 669558A5
Authority
CH
Switzerland
Prior art keywords
sandwich panels
polyethylene core
adhesive film
adhesive
flame
Prior art date
Application number
CH1183/86A
Other languages
German (de)
Inventor
Hansjoerg Walter Baumann
Original Assignee
Lonza Ag
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 Lonza Ag filed Critical Lonza Ag
Priority to CH1183/86A priority Critical patent/CH669558A5/en
Publication of CH669558A5 publication Critical patent/CH669558A5/en

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Classifications

    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • 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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/08—Surface shaping of articles, e.g. embossing; Apparatus therefor by flame treatment ; using hot gases
    • 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
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/48—Preparation of the surfaces
    • 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
    • B32B15/046—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 foam
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • 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
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/04—Treatment by energy or chemical effects using liquids, gas or steam
    • B32B2310/0445—Treatment by energy or chemical effects using liquids, gas or steam using gas or flames

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)

Abstract

Sandwich panels are made by flame treating the surface of a crosslinked polyethylene core under oxidising conditions, applying an adhesive to the treated surface, applying the outer layer and pressing. Pref. the adhesive used is a heat activatable adhesive film e.g. of modified ethylene copolymer and pressing is carried out at a temp. at which the adhesive film softens or melts. Pref. before the flame treatment the surface of the polyethylene core is provided with ridges 1.5-2.0 mm. deep and 0.5-1.0 mm. wide, or with slots 2.0-4.0 mm. deep. USE/ADVANTAGE - The flame treatment activates the surface of the polyethylene core and allows self supporting composite sandwich panels to be prepd. having bonded outer layers of metal, plastics, fibre reinforced polyester or epoxy resin etc. The panels have good heat-, sound- and vibration insulating properties and are usefule.g. for construction of delivery vans, etc.

Description

       

  
 



   BESCHREIBUNG



      Die vorliegende Erfindung betrifft ein Verfahren zur Herstel    lung von Sandwichplatten, die einen Kern aus Polyethylenschaumstoff aufweisen.



   Ziel der Erfindung sind Sandwichplatten, die wärmedämmend und selbsttragend sind. Ferner sollen sie vibrationsfrei und geräuschdämpfend sein.



   Erfindungsgemäss werden solche Sandwichplatten nach einem Verfahren gemäss Patentanspruch 1 hergestellt.



   Als Polyethylenschaumstoffkerne werden solche verwendet, die vernetzt sind. Die Vernetzung kann entweder durch chemische Mittel, z. B. mit Peroxiden, oder durch energiereiche Strahlung,   z. B.    Elektronenstrahlen, durchgeführt werden.



   Als Deckschichten können Metalle wie Stahl, Aluminium oder Kunststoffe, wie Polyvinylchlorid, ABS, Polystyrol, Polyethylen, oder faserverstärkte Kunststoffe, z. B. auf Basis von Epoxyd- oder ungesättigten Polyesterharzen.



   Die zu laminierende Oberfläche des   Polyethylenkerns    wird vor der Laminierung oxidierend beflammt. Dies geschieht vorzugsweise mit einer offenen Flamme eines Gasbrenners. Ist eine grosse Oberfläche zu beflammen, können selbstverständlich mehrere Brenner benützt werden.



   Die Zeit der Beflammung ist sehr kurz, muss genügen, um die Oberfläche für die Laminierung zu aktivieren.



   Handelt es sich um grosse Oberflächen, so muss dafür gesorgt werden, dass keine Lufteinschlüsse während der Laminierung in die Sandwichplatte gelangen. Dies kann dadurch verhindert werden, indem man die Oberfläche vor dem Beflammen mit Rillen von 0,5 bis 1,0 mm Breite und 1,5 bis2,0 mm Tiefe oder mit Schlitzen von 2,0 bis 4,0 mm Tiefe versieht.



   Die Verklebung des Kerns mit der Deckschicht geschieht entweder durch Anwendung eines Klebstoffes, wie z. B. Zweikomponenten-Polyurethan-Klebstoffe.



     VorzuRsweise    verwendet man aber eine wärmeaktivierbare   Klebefolie z.B.    aus modifiziertem Ethylencopolymer.



   Nachdem Aufbringen   des Klebers    und der Deckschicht wird die   Laminierung durch    Anwendung von Druck fertig durchgeführt.



   Bei Anwendung   eines Kl##'#pffes werd#n zweckmässig Tem-    peraturen von 40 bis 65   0C      angewen4iett   
Bei Anwendung einer Klebefolie   werden      solche Temperatu-    ren angewendet, die die Klebefolie aktivieren.   z5J > ueckmässige    Temperaturen liegen bei 95 bis 140    C,    wobei diese   T¯è3pseriu-    ren nur kurzfristig (10 bis 120 sek) angewendet werden.



   Beispiel
Sandwichplatte für einen Lieferwagenaufbau.



   Eine Platte aus vernetztem   Polyethylenschaumstoff mit    einer Dichte von 48 kg/m3 in den Massen von 2200 x 5000 mm und einer Dicke von 18 mm wurde auf beiden Seiten mit Rillen von 0,8 mm Breite und 2,0 mm Tiefe in einer Entfernung voneinander von 50,0 mm versehen.



   Diese Oberfläche wurde nun während einigen Sekunden oxidierend beflammt. Anschliessend wurde auf beiden Oberflächen eine Klebefolie aus modifiziertem Ethylencopolymerin einer Dicke von 50 micron aufgebracht und dann die Deckschicht aus   chromatisierten Aluminiumblechen von      1,0 mm    aufgelegt und in eine Presse gebracht. Dort wurde unter begrenztem Druck (1,2-1,5 bar) während 20 sek auf eine Temperatur von 155 Cwährend aufgeheizt und wieder abgekühlt.



   Die Eigenschaften der so erhaltenen Sandwichplatten sind: Gesamtdicke   ¸0mm    flächenbezogene Masse 6,40   kg/m2    Thermische Isolation k-Wert (beidseitig ruhende Luft)   1,4 W/m2K    Schwingungsdämpfung   X   grösser als 0,3 Kapillare Wasseraufnahme keine Wasserdampfdiffusionswiderstandsfaktor   = unendlich öl- und treibstoffbeständig
Leichte, geräuscharme, gut isolierende Sandwichplatten, lärmarm, mit guter Eigensteifigkeit zur Verwendung, z. B. als bzw. in Aufbauten für leichte LKW. 



  
 



   DESCRIPTION



      The present invention relates to a method for the produc- tion of sandwich panels which have a core made of polyethylene foam.



   The aim of the invention is sandwich panels that are heat-insulating and self-supporting. Furthermore, they should be vibration-free and noise-damping.



   According to the invention, such sandwich panels are produced by a method according to claim 1.



   Those which are crosslinked are used as polyethylene foam cores. Crosslinking can either be by chemical means, e.g. B. with peroxides, or by high-energy radiation, for. B. electron beams.



   Metals such as steel, aluminum or plastics, such as polyvinyl chloride, ABS, polystyrene, polyethylene, or fiber-reinforced plastics, e.g. B. based on epoxy or unsaturated polyester resins.



   The surface of the polyethylene core to be laminated is subjected to an oxidizing flame before lamination. This is preferably done with an open flame of a gas burner. If a large surface is to be flamed, several burners can of course be used.



   The flame exposure time is very short and must be sufficient to activate the surface for lamination.



   If the surfaces are large, it must be ensured that no air pockets get into the sandwich panel during lamination. This can be prevented by providing the surface with 0.5 to 1.0 mm wide and 1.5 to 2.0 mm deep grooves or 2.0 to 4.0 mm deep slots before flame treatment.



   The core is glued to the cover layer either by using an adhesive, such as. B. Two-component polyurethane adhesives.



     However, a heat-activated adhesive film is preferably used, e.g. made of modified ethylene copolymer.



   After applying the adhesive and the top layer, the lamination is carried out by applying pressure.



   When using a Kl ## '# pffes, temperatures from 40 to 65 0C are expediently used
When using an adhesive film, temperatures are used which activate the adhesive film. z5J> reasonable temperatures lie between 95 and 140 C, whereby these T¯è3pserieren are only used for a short time (10 to 120 sec).



   example
Sandwich panel for a van body.



   A sheet of cross-linked polyethylene foam with a density of 48 kg / m3 in the dimensions of 2200 x 5000 mm and a thickness of 18 mm was made on both sides with grooves of 0.8 mm width and 2.0 mm depth at a distance from each other 50.0 mm.



   This surface was then given an oxidizing flame for a few seconds. Subsequently, an adhesive film made of modified ethylene copolymer with a thickness of 50 microns was applied to both surfaces and then the top layer made of chromated aluminum sheets of 1.0 mm was placed and placed in a press. There it was heated to a temperature of 155 C for 20 seconds and cooled again under limited pressure (1.2-1.5 bar).



   The properties of the sandwich panels obtained in this way are: total thickness ¸0mm area-related mass 6.40 kg / m2 thermal insulation k-value (air resting on both sides) 1.4 W / m2K vibration damping X greater than 0.3 capillary water absorption no water vapor diffusion resistance factor = infinite oil and fuel-resistant
Light, low-noise, well-insulating sandwich panels, low noise, with good inherent rigidity for use, e.g. B. as or in superstructures for light trucks.

Claims (3)

PATENTANSPRÜCHE 1. Verfahren zur Herstellung von Sandwichplatten, die einen Kern aus Polyethylenschaumstoff aufweisen, dadurch gekennzeichnet, dass man die zu verklebende Oberfläche des Kerns aus vernetztem Polyethylen oxidierend beflammt, die so behandelte Oberfläche mit einem Kleber versieht und darauf die Deckschicht aufpresst.  PATENT CLAIMS 1. A process for the production of sandwich panels which have a core made of polyethylene foam, characterized in that the surface to be bonded of the core made of cross-linked polyethylene is oxidized, the surface treated in this way is provided with an adhesive and the cover layer is pressed thereon. 2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass man als Kleber eine wärmeaktivierbare Klebefolie z. B.  2. The method according to claim 1, characterized in that a heat-activatable adhesive film z. B. aus modifiziertem Ethylencopolymer verwendet und die Verpressung bei solcher Temperatur durchführt, dass die Klebefolie erweicht bzw. schmilzt. made of modified ethylene copolymer and the pressing is carried out at such a temperature that the adhesive film softens or melts. 3. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass man die zu verklebende Oberfläche des Kerns aus Polyethylen vor dem Beflammen mit Rillen mit 1,5 bis 2,0 mm Tiefe und mit 0,5 bis 1,0 mm Breite, oder mit Schlitzen mit 2,0 bis 4,0 mm Tiefe versieht.  3. The method according to claim 1, characterized in that the surface to be glued of the core made of polyethylene before flaming with grooves with a depth of 1.5 to 2.0 mm and a width of 0.5 to 1.0 mm, or with slots with a depth of 2.0 to 4.0 mm.
CH1183/86A 1986-03-24 1986-03-24 Sandwich panels with crosslinked foamed polyethylene core - are flame treated for surface activation prior to adhesive bonding of facing layers CH669558A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH1183/86A CH669558A5 (en) 1986-03-24 1986-03-24 Sandwich panels with crosslinked foamed polyethylene core - are flame treated for surface activation prior to adhesive bonding of facing layers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1183/86A CH669558A5 (en) 1986-03-24 1986-03-24 Sandwich panels with crosslinked foamed polyethylene core - are flame treated for surface activation prior to adhesive bonding of facing layers

Publications (1)

Publication Number Publication Date
CH669558A5 true CH669558A5 (en) 1989-03-31

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273738A2 (en) * 2001-03-22 2003-01-08 Thyssen Hünnebeck GmbH Formwork and method of manufacturing and repairing it
EP1275796A2 (en) * 2001-07-09 2003-01-15 Isosport Verbundbauteile Gesellschaft Mbh Construction element, especially shuttering plate, with protective layer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273738A2 (en) * 2001-03-22 2003-01-08 Thyssen Hünnebeck GmbH Formwork and method of manufacturing and repairing it
EP1273738A3 (en) * 2001-03-22 2003-04-02 Thyssen Hünnebeck GmbH Formwork and method of manufacturing and repairing it
EP1275796A2 (en) * 2001-07-09 2003-01-15 Isosport Verbundbauteile Gesellschaft Mbh Construction element, especially shuttering plate, with protective layer
EP1275796A3 (en) * 2001-07-09 2004-01-21 Isosport Verbundbauteile Gesellschaft Mbh Construction element, especially shuttering plate, with protective layer

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