EP1516017A1 - Polyurethane elastomer adhesively connected to polytetrafluorethylene and an elastic bearing containing one such polyurethane elastomer - Google Patents

Polyurethane elastomer adhesively connected to polytetrafluorethylene and an elastic bearing containing one such polyurethane elastomer

Info

Publication number
EP1516017A1
EP1516017A1 EP03757017A EP03757017A EP1516017A1 EP 1516017 A1 EP1516017 A1 EP 1516017A1 EP 03757017 A EP03757017 A EP 03757017A EP 03757017 A EP03757017 A EP 03757017A EP 1516017 A1 EP1516017 A1 EP 1516017A1
Authority
EP
European Patent Office
Prior art keywords
polyurethane elastomer
bonded
polyurethane
hot melt
polytetrafluoroethylene
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Withdrawn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
EP03757017A
Other languages
German (de)
French (fr)
Inventor
Andreas Wulf
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.)
BASF SE
Original Assignee
BASF 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
Application filed by BASF SE filed Critical BASF SE
Publication of EP1516017A1 publication Critical patent/EP1516017A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • 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
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • 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
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F16C3/026—Shafts made of fibre reinforced resin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • 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
    • C08G2110/00—Foam properties
    • C08G2110/0041—Foam properties having specified density
    • C08G2110/0066—≥ 150kg/m3
    • 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
    • C08G2170/00—Compositions for adhesives
    • C08G2170/20—Compositions for hot melt adhesives
    • 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
    • C08G2350/00—Acoustic or vibration damping material

Definitions

  • the invention relates to polyurethane elastomer, preferably thermoplastic polyurethane and / or cellular, preferably micro-cellular polyurethane elastomer, which may optionally contain polyurea structures, particularly preferably as cellular polyurethane elastomer, such a one with a density according to DIN 53 420 of 200 to 1100, preferably 300 to 800 kg / m 3 , a tensile strength according to DIN 53 571 of greater than 2, preferably 2 to 8 N / mm 2 , an elongation according to DIN 53 571 of greater than 300, preferably 300 to 700% and a tear resistance according to DIN 53 515 of greater than 8 , preferably 8 to 25 N / mm, adhesively bonded to polytetrafluoroethylene, preferably bonded by means of a reactive hot melt adhesive to polytetrafluoroethylene, also referred to below as PTFE.
  • polyurethane elastomer preferably thermoplastic polyurethane and / or
  • the invention relates to processes for producing such polyurethane elastomers bonded to polytetrafluoroethylene, and to elastic bearings, preferably circular bearings, ie cylindrical bearings preferably with a hollow inner, preferably cylindrical sleeve (ix), preferably based on steel or aluminum, the polyurethane elastomer as the preferred cylindrical damping element (xi), which at least partially encompasses the inner sleeve and contains at least one outer, preferably cylindrical, sleeve (x), preferably based on steel or aluminum, which usually fixes the polyurethane elastomer and can preferably be used for the external connection of the circular bearing the polyurethane elastomers according to the invention and automobiles or trucks containing the polyurethane elastomers according to the invention preferably as elastic bearings.
  • elastic bearings preferably circular bearings, ie cylindrical bearings preferably with a hollow inner, preferably cylindrical sleeve (ix), preferably based on steel or aluminum, the
  • Elastic bearings are used in automobiles and other technical devices and are generally known. With the aid of such elastic bearings, units, chassis components, among other things, are connected to one another or to the body, for example in automobiles.
  • elastomer materials fulfill the function of elastic support; on the other hand, due to their viscous properties, they are able to dissipate energy and thus dampen vibrations.
  • a high degree of damping is required, in particular for the damping of large amplitudes of low-frequency vibrations, which, for example, influence the connection of the shock absorber to the body.
  • low amplitudes and higher frequencies high damping is undesirable for reasons of vehicle acoustics.
  • the damping behavior of current, conventional round bearings is depending on the intrinsic damping capacity of the elastomer material used.
  • certain elastic bearings for example those in which more than one direction is to be stored in the room, for example motor bearings
  • conventional elastic bearings based on rubber or cellular elastomers this is only possible to a limited extent because under load, due to the transverse expansion of the material, there is a reaction in the other directions, e.g. due to friction phenomena.
  • the object of the present invention was to develop elastic bearings containing polyurethane elastomers, in particular cellular polyurethane elastomers and / or thermoplastic polyurethanes, in which the effect on the individual directions of movement is minimized, for example by friction effects.
  • This task was able to be adhesively bonded by means of polyurethane elastomers to polytetrafluoroethylene, for example foils, pipes, plates, rods and other molded parts based on PTFE, preferably bonded by means of a reactive hot-melt adhesive with polytetrafluoroethylene, preferably with a polytetrafluoroethylene film, particularly preferably with a thickness of 0.2 mm to 5 mm.
  • the polyurethane elastomers according to the invention are therefore preferably bearing elements made of prefabricated semi-finished products, in which the surfaces available for disposition are laminated with foils made of PTFE.
  • Polytetrafluoroethylene and polytetrafluoroethylene films are generally known and are commercially available, for example, from Arthur Krüger, Hamburg.
  • electrical discharge chamber for example plasma polymerization
  • Fluorination Fluorination
  • a preferred embodiment of the present invention are bearings, preferably circular bearings, in particular for the automotive industry.
  • the polyurethane elastomers which are usually encompassed by solid structural parts such as bushings or sleeves, take on account of their elastic properties. damping. Due to the lamination with PTFE, it is now possible to optimize the characteristics in the individual degrees of freedom by deliberate decoupling. For example, there may be at least two, preferably 2 to 4, polyurethane elastomers within a bearing that derive the forces for specific directions.
  • the individual polyurethane elastomers are preferably laminated in different orientations with PTFE, preferably on the surfaces that are perpendicular to the direction in which the load is passed through the polyurethane elastomer.
  • a preferred bearing is shown in Figures 1 and 2. This bearing contains three polyurethane elastomers (i), (ii) and (iii), in which (ii) and (iii) mainly absorb forces in the Z direction, while the polyurethane elastomer (i) derives forces acting perpendicular to the Z axis.
  • circular bearings containing a preferably cylindrical, preferably hollow, inner sleeve, a preferably cylindrical outer sleeve, and between the inner sleeve and the outer sleeve, at least two damping elements based on polyurethane elastomers, which are in different orientations, in particular perpendicular orientations with respect to one another PTFE film are adhesively bonded and preferably one PTFE film is in contact with the inner sleeve and the other PTFE film is in contact with the outer sleeve.
  • the polyurethane elastomer can be produced in contact with the PTFE film from the starting materials for the production of the polyurethane elastomer, for example by direct foaming.
  • the generally known starting materials which are known to the person skilled in the art as well as the polyurethane elastomers themselves are suitable for the production of the polyurethane elastomers.
  • the polyurethane elastomers are usually produced from di- and / or polyisocyanates known for this purpose, compounds which are reactive toward isocyanates, usually polyether alcohols and / or polyester alcohols, and, if appropriate, chain extenders, catalysts, blowing agents and additives.
  • the PTFE film is preferred, in particular the surface on which the polyurethane elastomer is produced, before the polyurethane elastomer is produced or glued in contact with the PTFE film is pretreated by generally known and commercially available adhesion promoters, for example Chemosil® from Henkel or Cilbond from CIL.
  • the PTFE to the polyurethane elastomer for the adhesive connection of these materials.
  • It is preferably a reactive hot melt adhesive which preferably contains encapsulated isocyanates which are preferably embedded in a polyol matrix.
  • These reactive hot melt adhesives are characterized in that they e.g. applied as a powder to the surface to be bonded and quasi melted in the manner of an enamel, as a result of which they adhere stably to the surface to be bonded without losing any of their reactivity. It is thus possible to position the pretreated parts to be positioned without shearing the adhesive off the surface of the part.
  • the crosslinking reaction is initiated only when the prepositioned parts to be warmed up well above the melting point of the powder by breaking up the encapsulated isocyanates.
  • Applying the powder, e.g. with the usual particle size on the surface to be glued and the fixing of the powder by melting the powder is also referred to as "sintering".
  • the reactive hotmelt adhesive based on encapsulated isocyanates preferably has a melting range at temperatures of less than 95 ° C., preferably 30 ° C. to 90 ° C., particularly preferably 45 ° C. to 65 ° C., and a reaction range at temperatures preferably greater than 100 ° C. particularly preferably 110 ° C. to 125 ° C.
  • Such reactive hotmelt adhesives are available from Collano Ebnöther AG, Sempach-Station, Switzerland and are described in the article "Pre-Applicable PUR Hotmelts: Activation by Thermal Impact", Adhesive Gluing and Sealing, Volume 43, 10/99, pp. 22-24 ,
  • the method for producing polyurethane elastomers adhesively bonded to polytetrafluoroethylene, preferably polytetrafluoroethylene film can thus be carried out, for example, by powdering reactive hotmelt adhesives based on encapsulated isocyanates, preferably embedded in a polyol matrix, on the surface of the polyurethane elastomer and / or on the surface of the polytetrafluoroethylene film to be bonded, the pulverized, preferably with an average particle size of less than 500 microns, preferably 100 microns to 350 microns, reactive hot melt adhesives at a temperature of 30 ° C to 90 ° C, preferably 45 ° C to 65 ° C melts, the parts to be glued fixed to each other and then the reactive hot melt adhesive by heating to a temperature greater than 100 ° C, preferably 110 ° C to 125 ° C activated and by reacting the reactive hot melt adhesive, the polytetrafluoroethylene film to be bonded is bonded
  • the surface energy of the surface of the polytetrafluoroethylene film to be bonded can preferably be increased before this surface comes into contact with the reactive hot melt adhesive. This can be done by generally known methods, for example the etching already described, by electrical discharges or fluorination. Pretreatment of the PTFE surface with which the polyurethane elastomer is bonded is also possible and preferred with generally known and commercially available adhesion promoters, for example Chemosil® from Henkel or Cilbond from CIL.
  • the elastomers particularly preferably have the physical properties shown at the outset.
  • Elastomers based on polyisocyanate polyaddition products and their preparation are generally known and can be described in many different ways, for example in EP-A 62 835, EP-A 36 994, EP-A 250 969, DE-A 195 48 770 and DE-A 195 48 771.
  • the preparation is usually carried out by reacting isocyanates with compounds which are reactive toward isocyanates.
  • the elastomers based on cellular polyisocyanate polyaddition products are usually produced in a form in which the reactive starting components are reacted with one another.
  • generally customary shapes are considered as shapes, for example metal shapes which, because of their shape, ensure the three-dimensional shape of the spring element according to the invention.
  • the polyisocyanate polyaddition products can be prepared by generally known processes, for example by using the following starting materials in a one- or two-stage process:
  • auxiliaries and / or additives for example polysiloxanes and / or fatty acid sulfonates.
  • the cellular polyisocyanate polyaddition products preferably have a compression set of less than 25% in accordance with DIN 53 572, cubes measuring 40 mm ⁇ 40 mm ⁇ 30 mm without silicone coating being used as test specimens, the test being carried out with constant deformation, the test specimens being around 40 % pressed together and kept in the air circulation cabinet for 22 hours at 80 ° C, the test device is cooled to room temperature for 2 hours in the compressed state after removal from the heating cabinet, then the test specimen is removed from the test device and 10 min i 30 s after the removal of the Test specimen from the test facility the height of the test specimen is measured with an accuracy of 0.1 mm.
  • the preferred thermoplastic polyurethanes are also generally known as a material, are widely described and are commercially available.
  • the thermoplastic polyurethanes, also called TPU preferably have a Shore hardness of 60
  • a reactive hot melt in powder form (Purbond® HCM VN 555-1) was applied to the surface of a cylindrical, hollow outer bushing (x) with a height of 30 mm, an outer diameter of 52 mm and a diameter of the cavity of 48 mm made of aluminum Collano company applied and melted at a temperature of 60 ° C for 30 min.
  • a cylindrical, hollow bearing element (xi) with a height of 30 mm, an outer diameter of 48 mm and a diameter of the cavity of 38.5 mm was inserted into the outer bush (x) coated in this way.
  • the reactive hot melt was also applied to the inner surface of the bearing element.
  • a strip of the activated PTFE film (xii) with a thickness of 0.5 mm was inserted into the cavity of the bearing element (xi) prepared in this way and pretensioned with the inner bushing (ix).
  • the inner bush was made of steel with a height of 30 mm, an outer diameter of 38.5 mm and an inner diameter of 14.3 mm.
  • the assembled circular bearing was annealed at a temperature of 110 ° C for 180 minutes. The reaction process was initiated and carried out.
  • the corresponding circular bearing is shown in FIG. 3, the individual parts (ix), (x), (xi) and (xii) being shown pushed apart for a better overview.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Ocean & Marine Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention relates to a polyurethane elastomer which is adhesively connected to polytetrafluoroethylene.

Description

POLYURETHANELASTOMER HAFTEND VERBUNDEN MIT POLYTETRAFLUORETHYLEN UND ELASTISCHES LAGER ENTHALTEND EIN SOLCHES POLYURETHANELASTOMER POLYURETHANE ELASTOMER ADHESIVELY ASSOCIATED WITH POLYTETRAFLUORETHYLENE AND ELASTIC BEARING CONTAINING SUCH A POLYURETHANE ELASTOMER
Beschreibungdescription
Die Erfindung betrifft Polyurethanelastomer, bevorzugt thermoplastisches Polyurethan und/oder zelliges, bevorzugt mikro- zelliges Polyurethanelastomer, das ggf. PolyharnstoffStrukturen enthalten kann, besonders bevorzugt als zelliges Polyurethan- elastomer ein solches mit einer Dichte nach DIN 53 420 von 200 bis 1100, bevorzugt 300 bis 800 kg/m3, einer Zugfestigkeit nach DIN 53 571 von größer 2, bevorzugt 2 bis 8 N/mm2, einer Dehnung nach DIN 53 571 von größer 300, bevorzugt 300 bis 700 % und einer Weiterreißfestigkeit nach DIN 53 515 von größer 8, bevorzugt 8 bis 25 N/mm, haftend verbunden mit Polytetrafluorethylen, bevorzugt verklebt mittels eines reaktiven Schmelzklebstoffs mit Polytetrafluorethylen, im Folgenden auch als PTFE bezeichnet. Außerdem betrifft die Erfindung Verfahren zur Herstellung solcher mit Polytetrafluorethylen verklebten Polyurethanelastomere, sowie elastische Lager, bevorzugt Rundlager, d.h. zylindrische Lager bevorzugt mit einer hohlen inneren bevorzugt zylindrischen Hülse (ix) , bevorzugt auf der Basis von Stahl oder Aluminium, dem Polyurethanelastomer als bevorzugt zylindrisches Dämpfungselement (xi) , das die innere Hülse zumindest teilweise u fasst sowie min- destens einer äußeren bevorzugt zylindrischen Hülse (x) , bevorzugt auf der Basis von Stahl oder Aluminium, die das Polyurethanelastomer üblicherweise fixiert und bevorzugt zur äußeren Anbindung des Rundlagers dienen kann, enthaltend die erfindungsgemäßen Polyurethanelastomere sowie Automobile oder Lastkraftwa- gen enthaltend die erfindungsgemäßen Polyurethanelastomere bevorzugt als elastische Lager.The invention relates to polyurethane elastomer, preferably thermoplastic polyurethane and / or cellular, preferably micro-cellular polyurethane elastomer, which may optionally contain polyurea structures, particularly preferably as cellular polyurethane elastomer, such a one with a density according to DIN 53 420 of 200 to 1100, preferably 300 to 800 kg / m 3 , a tensile strength according to DIN 53 571 of greater than 2, preferably 2 to 8 N / mm 2 , an elongation according to DIN 53 571 of greater than 300, preferably 300 to 700% and a tear resistance according to DIN 53 515 of greater than 8 , preferably 8 to 25 N / mm, adhesively bonded to polytetrafluoroethylene, preferably bonded by means of a reactive hot melt adhesive to polytetrafluoroethylene, also referred to below as PTFE. In addition, the invention relates to processes for producing such polyurethane elastomers bonded to polytetrafluoroethylene, and to elastic bearings, preferably circular bearings, ie cylindrical bearings preferably with a hollow inner, preferably cylindrical sleeve (ix), preferably based on steel or aluminum, the polyurethane elastomer as the preferred cylindrical damping element (xi), which at least partially encompasses the inner sleeve and contains at least one outer, preferably cylindrical, sleeve (x), preferably based on steel or aluminum, which usually fixes the polyurethane elastomer and can preferably be used for the external connection of the circular bearing the polyurethane elastomers according to the invention and automobiles or trucks containing the polyurethane elastomers according to the invention preferably as elastic bearings.
Elastische Lagerungen werden in Automobilen und anderen technischen Geräten verwendet und sind allgemein bekannt. Mit Hilfe solcher elastischer Lagerungen werden bspw. im Automobil Aggregate, Fahrwerksbauteile u.a. untereinander oder mit der Karosserie verbunden. Dabei erfüllen sie durch die Verwendung von Elastomerwerkstoffen die Funktion der elastischen Lagerung; andererseits sind sie auf Grund ihrer viskosen Eigenschaften in der Lage, Energie zu dissipieren und damit Schwingungen zu dämpfen. Dabei wird ein hohes Maß an Dämpfung besonders für die Bedampfung großer Amplituden von niederfrequenten Schwingungen benötigt, die z.B. die Anbindung der Stoßdämpfers an die Karosserie beeinflussen. Andererseits ist bei kleinen Amplituden und höheren Frequenzen eine hohe Dämpfung aus Gründen der Fahrzeugakustik unerwünscht . Das Dämpfungsverhalten derzeitiger, konventioneller Rundlager ist abhängig vom intrinsischen Dämpfungsvermögen des eingesetzten Elastomerwerkstoffes. Bei bestimmten elastischen Lagerungen, z.B. solchen, bei denen mehr als eine Richtung im Raum zu lagern ist, z.B. Motorlagerungen, ist es häufig notwendig in den einzelnen Wirkrichtungen unterschiedliche Steifig- keiten und Dämpfungen einzustellen, um die Anforderungen zu erfüllen. Dabei ist es wünschenswert, eine möglichst tiefgreifenden Entkopplung der einzelnen Richtungen zu erreichen. Bei konventionellen elastischen Lagerungen auf der Basis von Gummi oder zelligen Elastomeren ist dies nur eingeschränkt möglich, weil bei Belastung bedingt durch die Querdehnung des Materials eine Rückwirkung auf die anderen Richtungen bspw. durch Reibungsphänomene stattfindet.Elastic bearings are used in automobiles and other technical devices and are generally known. With the aid of such elastic bearings, units, chassis components, among other things, are connected to one another or to the body, for example in automobiles. Through the use of elastomer materials, they fulfill the function of elastic support; on the other hand, due to their viscous properties, they are able to dissipate energy and thus dampen vibrations. A high degree of damping is required, in particular for the damping of large amplitudes of low-frequency vibrations, which, for example, influence the connection of the shock absorber to the body. On the other hand, with low amplitudes and higher frequencies, high damping is undesirable for reasons of vehicle acoustics. The damping behavior of current, conventional round bearings is depending on the intrinsic damping capacity of the elastomer material used. In the case of certain elastic bearings, for example those in which more than one direction is to be stored in the room, for example motor bearings, it is often necessary to set different stiffnesses and dampings in the individual directions of action in order to meet the requirements. It is desirable to decouple the individual directions as far as possible. With conventional elastic bearings based on rubber or cellular elastomers, this is only possible to a limited extent because under load, due to the transverse expansion of the material, there is a reaction in the other directions, e.g. due to friction phenomena.
Aufgabe der vorliegenden Erfindung war es, elastische Lager enthaltend Polyurethanelastomere, insbesondere zellige Polyurethanelastomere und/oder thermoplastische Polyurethane zu entwickeln, bei denen die Rückwirkung auf die einzelnen Bewegungsrichtungen beispielsweise durch Reibungseffekte möglichst minimiert wird.The object of the present invention was to develop elastic bearings containing polyurethane elastomers, in particular cellular polyurethane elastomers and / or thermoplastic polyurethanes, in which the effect on the individual directions of movement is minimized, for example by friction effects.
Diese Aufgabe konnte durch Polyurethanelastomere haftend verbunden mit Polytetrafluorethylen, beispielsweise Folien, Rohre, Platten, STangen und andere Formteile auf Basis PTFE, bevorzugt verklebt mittels eines reaktiven Schmelzklebstoffs mit Polytetra- fluorethylen, bevorzugt mit einer Polytetrafluorethylenfolie, besonders bevorzugt mit einer Dicke von 0,2 mm bis 5 mm, gelöst werden. Bei den erfindungsgemäßen Polyurethanelastomeren handelt es sich somit bevorzugt um Lagerelemente aus vorgefertigten Halbzeugen, bei denen die zur Disposition stehenden Flächen mit Folien aus PTFE kaschiert sind. Polytetrafluorethylen und Polytetrafluorethylenfolien sind allgemein bekannt und kommerziell beispielsweise bei der Firma Arthur Krüger, Hamburg erhältlich. Als Material zur Kaschierung des Lagerelementes können bevorzugt PTFE-Folien eingesetzt werden, deren Oberfläche mit Hilfe von bekannten Ätzverfahren oder anderer die Oberflächenenergie und Benetzbarkeit erhöhender Verfahren, beispielsweise durch das Aufbringen elektrischer Ladungen in einer elektrischen Ent- ladungskam er (z.B. Plasmapolymerisation) und/oder Fluorierung, aktiviert und damit für eine Verklebung vorbereitet worden ist. Derartige aktivierte Folien beziehungsweise Verfahren zur Aktivierung der Folien sind kommerziell erhältlich.This task was able to be adhesively bonded by means of polyurethane elastomers to polytetrafluoroethylene, for example foils, pipes, plates, rods and other molded parts based on PTFE, preferably bonded by means of a reactive hot-melt adhesive with polytetrafluoroethylene, preferably with a polytetrafluoroethylene film, particularly preferably with a thickness of 0.2 mm to 5 mm. The polyurethane elastomers according to the invention are therefore preferably bearing elements made of prefabricated semi-finished products, in which the surfaces available for disposition are laminated with foils made of PTFE. Polytetrafluoroethylene and polytetrafluoroethylene films are generally known and are commercially available, for example, from Arthur Krüger, Hamburg. As the material for the lamination of the bearing element, preference can be given to using PTFE foils, the surface of which, with the aid of known etching processes or other processes which increase the surface energy and wettability, for example by applying electrical charges in an electrical discharge chamber (for example plasma polymerization) and / or Fluorination, activated and thus prepared for gluing. Such activated films or processes for activating the films are commercially available.
Eine bevorzugte Ausgestaltung der vorliegenden Erfindung sind Lager, bevorzugt Rundlager insbesondere für den Automobilbau. Bei diesen Lagern übernehmen die Polyurethanelastomere, die üblicherweise von festen Konstruktionsteilen wie z.B. Buchsen oder Hülsen umfasst werden, aufgrund ihrer elastischen Eigen- schaften die Dämpfung. Aufgrund der Kaschierung mit PTFE ist es nunmehr möglich, die Charakteristik in den einzelnen Freiheitsgraden durch das gezielte Entkoppeln zu optimieren. Dabei können beispielsweise innerhalb eines Lagers mindestens zwei, bevorzugt 2 bis 4 Polyurethanelastomere vorliegen, die die Ableitung der Kräfte für spezifische Richtungen übernehmen. Eine Kaschierung der einzelnen Polyurethanelastomere erfolgt bevorzugt in unterschiedlicher Ausrichtung mit PTFE, bevorzugt an den Oberflächen, die senkrecht zu der Richtung stehen, in der die belastende Kraft durch das Polyurethanelastomer geleitet wird. Ein bevorzugtes Lager ist in den Figuren 1 und 2 dargestellt. Dieses Lager enthält drei Polyurethanelastomere (i) , (ii) und (iii) , bei denen (ii) und (iii) hauptsächlich Kräfte in Z-Richtung aufnehmen, während das Polyurethanelastomer (i) senkrecht zur Z-Achse wirkende Kräfte ableitet. Entsprechend ist bei den Polyurethanelastomeren (ii) und (iii) mindestens eine Oberfläche senkrecht zur Z-Achse mit PTFE-Folie kaschiert (haftend verbunden) , während bei dem Polyurethanelastomer (i) die Oberfläche parallel zur Z-Achse und senkrecht zur X- und Y-Achse kaschiert und somit entkoppelt ist. Die PTFE-Folie ist in der Figur 2 mit (iv) gekennzeichnet. Erfindungsgemäß bevorzugt sind somit Rundlager enthalten eine bevorzugt zylindrische bevorzugt hohle innere Hülse, eine bevorzugt zylindrische äußere Hülse sowie zwischen der inneren Hülse und der äußeren Hülse mindestens zwei Dämp- fungselemente auf der Basis von Polyurethanelastomeren, die in unterschiedlicher Ausrichtung insbesondere senkrechter Ausrichtung zueinander, mit einer PTFE-Folie haftend verbunden sind und wobei bevorzugt die eine PTFE-Folie in Kontakt mit der inneren Hülse steht und die andere PTFE-Folie in Kontakt mit der äußeren Hülse.A preferred embodiment of the present invention are bearings, preferably circular bearings, in particular for the automotive industry. In these bearings, the polyurethane elastomers, which are usually encompassed by solid structural parts such as bushings or sleeves, take on account of their elastic properties. damping. Due to the lamination with PTFE, it is now possible to optimize the characteristics in the individual degrees of freedom by deliberate decoupling. For example, there may be at least two, preferably 2 to 4, polyurethane elastomers within a bearing that derive the forces for specific directions. The individual polyurethane elastomers are preferably laminated in different orientations with PTFE, preferably on the surfaces that are perpendicular to the direction in which the load is passed through the polyurethane elastomer. A preferred bearing is shown in Figures 1 and 2. This bearing contains three polyurethane elastomers (i), (ii) and (iii), in which (ii) and (iii) mainly absorb forces in the Z direction, while the polyurethane elastomer (i) derives forces acting perpendicular to the Z axis. Accordingly, in the case of the polyurethane elastomers (ii) and (iii), at least one surface perpendicular to the Z axis is laminated (adhesively bonded), while in the case of the polyurethane elastomer (i) the surface is parallel to the Z axis and perpendicular to the X and Y-axis is laminated and thus decoupled. The PTFE film is identified in Figure 2 with (iv). According to the invention, preference is given to circular bearings containing a preferably cylindrical, preferably hollow, inner sleeve, a preferably cylindrical outer sleeve, and between the inner sleeve and the outer sleeve, at least two damping elements based on polyurethane elastomers, which are in different orientations, in particular perpendicular orientations with respect to one another PTFE film are adhesively bonded and preferably one PTFE film is in contact with the inner sleeve and the other PTFE film is in contact with the outer sleeve.
Als Verfahren zur Verbindung der PTFE-Folie mit dem Polyurethanelastomer bieten sich insbesondere zwei Alternativen an. So kann das Polyurethanelastomer in Kontakt mit der PTFE-Folie aus den AusgangsStoffen zur Herstellung des Polyurethanelastomers hergestellt werden, beispielsweise durch direktes Anschäumen. Zur Herstellung der Polyurethanelastomere kommen die allgemein bekannten Ausgangstoffe in Frage, die dem Fachmann wie auch die Polyurethanelastomere selbst allgemein bekannt sind. Überlicher- weise werden die Polyurethanelastomere aus hierfür bekannten Di- und/oder Polyisocyanaten, gegenüber Isocyanaten reaktiven Verbindungen, üblicherweise Polyetheralkohole und/oder Polyesteralkohole sowie gegebenenfalls Kettenverlängerungsmitteln, Katalysatoren, Treibmitteln und Zusatzstoffen hergestellt. Bevor- zugt wird die PTFE-Folie, insbesondere die Oberfläche, auf der das Polyurethanelastomer hergestellt wird, bevor das Polyurethanelastomer in Kontakt mit der PTFE-Folie hergestellt oder verklebt wird, durch allgemein bekannte und kommerziell erhältliche Haftvermittler, beispielsweise Chemosil® der Fa. Henkel oder Cilbond der Firma CIL vorbehandelt.In particular, two alternatives are available as methods for connecting the PTFE film to the polyurethane elastomer. For example, the polyurethane elastomer can be produced in contact with the PTFE film from the starting materials for the production of the polyurethane elastomer, for example by direct foaming. The generally known starting materials which are known to the person skilled in the art as well as the polyurethane elastomers themselves are suitable for the production of the polyurethane elastomers. The polyurethane elastomers are usually produced from di- and / or polyisocyanates known for this purpose, compounds which are reactive toward isocyanates, usually polyether alcohols and / or polyester alcohols, and, if appropriate, chain extenders, catalysts, blowing agents and additives. The PTFE film is preferred, in particular the surface on which the polyurethane elastomer is produced, before the polyurethane elastomer is produced or glued in contact with the PTFE film is pretreated by generally known and commercially available adhesion promoters, for example Chemosil® from Henkel or Cilbond from CIL.
Bevorzugt ist allerdings das Verkleben des PTFE mit dem Polyurethanelastomer zur haftenden Verbindung dieser Werkstoffe. Bevorzugt handelt es sich dabei um einen reaktiven Schmelzklebstoff, der bevorzugt verkapselte Isocyanate enthält, die bevorzugt in eine Polyolmatrix eingebettet sind. Diese reaktiven Schmelzklebstoffe zeichnen sich dadurch aus, dass sie z.B. als Pulver auf die zu verklebende Oberfläche appliziert und quasi in Art eines Emailles aufgeschmolzen werden können, wodurch sie auf der zu verklebenden Oberfläche standfest haften ohne dadurch wesentlich an Reaktivität zu verlieren. Damit ist es möglich, derartig vorbehandelte Fügeteile zueinander zu positionieren, ohne den Klebstoff von der Fügeteiloberflache abzuscheren. Die Vernetzungsreaktion wird erst bei Erwärmung der vorpositionierten Fügeteile deutlich über den Schmelzpunkt des Pulvers durch Aufbrechen der verkapselten Isocyanate eingeleitet. Das Auftragen des Pulvers, z.B. mit üblicher Teilchengröße auf die zu verklebende Oberfläche und das Fixieren des Pulvers durch Aufschmelzen des Pulvers wird auch als "Sintern" bezeichnet. Bevorzugt weist der reaktive Schmelzklebstoff auf der Basis verkapselter Isocyanate einen Schmelzbereich bei Temperaturen von kleiner 95 °C, bevorzugt 30°C bis 90°C, besonders bevorzugt 45°C bis 65°C, und einen Reaktionsbereich bei Temperaturen bevorzugt größer 100°C, besonders bevorzugt 110°C bis 125°C auf. Derartige reaktive Schmelzklebstoffe sind bei der Firma Collano Ebnöther AG, Sempach-Station, Schweiz erhältlich und in dem Artikel "Vorapplizierbare PUR-Hotmelts : Aktivierung per Wärmestoß", Adhäsion Kleben und Dichten, Jahrgang 43, 10/99, S. 22-24 beschrieben.However, it is preferred to glue the PTFE to the polyurethane elastomer for the adhesive connection of these materials. It is preferably a reactive hot melt adhesive which preferably contains encapsulated isocyanates which are preferably embedded in a polyol matrix. These reactive hot melt adhesives are characterized in that they e.g. applied as a powder to the surface to be bonded and quasi melted in the manner of an enamel, as a result of which they adhere stably to the surface to be bonded without losing any of their reactivity. It is thus possible to position the pretreated parts to be positioned without shearing the adhesive off the surface of the part. The crosslinking reaction is initiated only when the prepositioned parts to be warmed up well above the melting point of the powder by breaking up the encapsulated isocyanates. Applying the powder, e.g. with the usual particle size on the surface to be glued and the fixing of the powder by melting the powder is also referred to as "sintering". The reactive hotmelt adhesive based on encapsulated isocyanates preferably has a melting range at temperatures of less than 95 ° C., preferably 30 ° C. to 90 ° C., particularly preferably 45 ° C. to 65 ° C., and a reaction range at temperatures preferably greater than 100 ° C. particularly preferably 110 ° C. to 125 ° C. Such reactive hotmelt adhesives are available from Collano Ebnöther AG, Sempach-Station, Switzerland and are described in the article "Pre-Applicable PUR Hotmelts: Activation by Thermal Impact", Adhesive Gluing and Sealing, Volume 43, 10/99, pp. 22-24 ,
Das Verfahren zur Herstellung von Polyurethanelastomeren haftend verbunden mit Polytetrafluorethylen, bevorzugt Polytetrafluor- ethylenfolie, kann somit beispielsweise derart erfolgen, dass man pulverisierte reaktive Schmelzklebstoffe auf der Basis von verkapselten Isocyanaten, bevorzugt eingebettet in eine Polyolmatrix, auf die zu verklebende Oberfläche des Polyurethan- elastomers und/oder auf die zu verklebende Oberfläche der Polytetrafluorethylenfolie aufträgt, die pulverisierten, bevorzugt mit einer mittleren Partikelgröße von kleiner 500 μm, bevorzugt 100 μm bis 350 μm, reaktiven Schmelzklebstoffe bei einer Temperatur von 30°C bis 90°C, bevorzugt 45°C bis 65 °C auf- schmilzt, die zu verklebenden Teile zueinander fixiert und anschließend den reaktiven Schmelzklebstoff durch Erhitzen auf eine Temperatur von größer 100°C, bevorzugt 110°C bis 125°C aktiviert und durch Umsetzung des reaktiven Schmelzklebstoff die zu verklebende Polytetrafluorethylenfolie mit dem Polyurethanelastomer verklebt, d.h. haftend verbindet. Bevorzugt kann man die Oberflächenenergie der zu verklebende Oberfläche der Polytetrafluorethylenfolie erhöhen, bevor diese Oberfläche mit dem reaktiven Schmelzklebstoff in Verbindung kommt. Dies kann durch allgemein bekannte Verfahren, beispielsweise das bereits geschilderte Ätzen, durch elektrische Entladungen oder Fluorierung geschehen. Auch eine Vorbehandlung der PTFE-Ober- fläche, mit der das Polyurethanelastomer verklebt wird, mit allgemein bekannten und kommerziell erhältlichen Haftvermittlern, beispielsweise Chemosil® der Fa. Henkel oder Cilbond der Firma CIL ist möglich und bevorzugt.The method for producing polyurethane elastomers adhesively bonded to polytetrafluoroethylene, preferably polytetrafluoroethylene film, can thus be carried out, for example, by powdering reactive hotmelt adhesives based on encapsulated isocyanates, preferably embedded in a polyol matrix, on the surface of the polyurethane elastomer and / or on the surface of the polytetrafluoroethylene film to be bonded, the pulverized, preferably with an average particle size of less than 500 microns, preferably 100 microns to 350 microns, reactive hot melt adhesives at a temperature of 30 ° C to 90 ° C, preferably 45 ° C to 65 ° C melts, the parts to be glued fixed to each other and then the reactive hot melt adhesive by heating to a temperature greater than 100 ° C, preferably 110 ° C to 125 ° C activated and by reacting the reactive hot melt adhesive, the polytetrafluoroethylene film to be bonded is bonded to the polyurethane elastomer, that is to say adhesively connects. The surface energy of the surface of the polytetrafluoroethylene film to be bonded can preferably be increased before this surface comes into contact with the reactive hot melt adhesive. This can be done by generally known methods, for example the etching already described, by electrical discharges or fluorination. Pretreatment of the PTFE surface with which the polyurethane elastomer is bonded is also possible and preferred with generally known and commercially available adhesion promoters, for example Chemosil® from Henkel or Cilbond from CIL.
Bei den zelligen Polyurethanelastomeren, die gegebenenfallsIn the case of cellular polyurethane elastomers, which, if appropriate
Harnstoffstrukturen enthalten können, handelt es sich bevorzugt um mikrozellige Elastomere auf der Basis von Polyisocyanat-Poly- additionsprodukten, bevorzugt mit Zellen mit einem Durchmesser von 0,01 mm bis 0,5 mm, besonders bevorzugt 0,01 bis 0,15 mm. Besonders bevorzugt besitzen die Elastomere die eingangs dargestellten physikalischen Eigenschaften. Elastomere auf der Basis von Polyisocyanat-Polyadditionsprodukten und ihre Herstellung sind allgemein bekannt und vielfältig beschreiben, beispielsweise in EP-A 62 835, EP-A 36 994, EP-A 250 969, DE-A 195 48 770 und DE-A 195 48 771. Die Herstellung erfolgt üblicherweise durch Umsetzung von Isocyanaten mit gegenüber Isocyanaten reaktiven Verbindungen. Die Elastomere auf der Basis von zelligen Polyiso- cyanat-Polyadditionsprodukte werden üblicherweise in einer Form hergestellt, in der man die reaktiven Ausgangskomponenten mit- einander umsetzt. Als Formen kommen hierbei allgemein übliche Formen in Frage, beispielsweise Metallformen, die aufgrund ihrer Form die erfindungsgemäße dreidimensionale Form des Federelements gewährleisten. Die Herstellung der Polyisocyanat-Polyadditions- produkte kann nach allgemein bekannten Verfahren erfolgen, beispielsweise indem man in einem ein- oder zweistufigen Prozess die folgenden Ausgangsstoffe einsetzt:Can contain urea structures, it is preferably microcellular elastomers based on polyisocyanate polyadducts, preferably with cells with a diameter of 0.01 mm to 0.5 mm, particularly preferably 0.01 to 0.15 mm. The elastomers particularly preferably have the physical properties shown at the outset. Elastomers based on polyisocyanate polyaddition products and their preparation are generally known and can be described in many different ways, for example in EP-A 62 835, EP-A 36 994, EP-A 250 969, DE-A 195 48 770 and DE-A 195 48 771. The preparation is usually carried out by reacting isocyanates with compounds which are reactive toward isocyanates. The elastomers based on cellular polyisocyanate polyaddition products are usually produced in a form in which the reactive starting components are reacted with one another. In this case, generally customary shapes are considered as shapes, for example metal shapes which, because of their shape, ensure the three-dimensional shape of the spring element according to the invention. The polyisocyanate polyaddition products can be prepared by generally known processes, for example by using the following starting materials in a one- or two-stage process:
(a) Isocyanat,(a) isocyanate,
(b) gegenüber Isocyanaten reaktiven Verbindungen, (c) Wasser und gegebenenfalls(b) compounds reactive towards isocyanates, (c) water and optionally
(d) Katalysatoren,(d) catalysts,
(e) Treibmittel und/oder(e) propellant and / or
(f) Hilfs- und/oder Zusatzstoffe, beispielsweise Polysiloxane und/oder Fettsäuresulfonate. Bevorzugt weisen die zelligen Polyisocyanat-Polyadditions- produkten einen Druckverformungsrest kleiner 25 % nach DIN 53 572, wobei als Prüfkörper Würfel der Abmessung 40 mm x 40 mm x 30 mm ohne Silikonanstrich verwendet werden, die Prüfung bei konstanter Verformung erfolgt, wobei die Prüfkörper um 40 % zusammengedrückt und 22 Stunden bei 80°C im Umluftschrank gehalten werden, die Prüfeinrichtung nach der Entnahme aus dem Wärmeschrank 2 Stunden im zusammengedrückten Zustand auf Raumtemperatur abgekühlt wird, anschließend der Prüfkörper aus der Prüfeinrichtung entnommen wird und 10 min i 30 s nach der Entnahme der Prüfkörper aus der Prüfeinrichtung die Höhe der Prüfkörper auf 0,1 mm genau gemessen wird. Auch die bevorzugten thermoplastischen Polyurethane sind als Werkstoff allgemein bekannt, vielfältig beschrieben und kommerziell erhältlich. Die thermoplastischen Polyurethane, auch TPU genannt, weisen bevorzugt eine Shore-Härte von 60 Shore-A bis 85 Shore-D auf.(f) auxiliaries and / or additives, for example polysiloxanes and / or fatty acid sulfonates. The cellular polyisocyanate polyaddition products preferably have a compression set of less than 25% in accordance with DIN 53 572, cubes measuring 40 mm × 40 mm × 30 mm without silicone coating being used as test specimens, the test being carried out with constant deformation, the test specimens being around 40 % pressed together and kept in the air circulation cabinet for 22 hours at 80 ° C, the test device is cooled to room temperature for 2 hours in the compressed state after removal from the heating cabinet, then the test specimen is removed from the test device and 10 min i 30 s after the removal of the Test specimen from the test facility the height of the test specimen is measured with an accuracy of 0.1 mm. The preferred thermoplastic polyurethanes are also generally known as a material, are widely described and are commercially available. The thermoplastic polyurethanes, also called TPU, preferably have a Shore hardness of 60 Shore-A to 85 Shore-D.
BeispieleExamples
Auf die Oberfläche einer zylindrischen, hohlen Außenbuchse (x) mit einer Höhe von 30 mm, einem äußeren Durchmesser von 52 mm und einem Durchmesser des Hohlraum von 48 mm aus Aluminium wurde ein reaktiver Hotmelt in Pulverform (Purbond® HCM VN 555-1) der Firma Collano aufgetragen und bei einer Temperatur von 60°C für 30 min aufgeschmolzen. In die derart beschichtete Außenbuchse (x) wurde ein zylindrisches, hohles Lagerelement (xi) mit einer Höhe von 30 mm, einem äußeren Durchmesser von 48 mm und einem Durchmesser des Hohlraums von 38,5 mm gesteckt. Auf die innere Oberfläche des Lagerelementes war ebenfalls der reaktive Hotmelt appliziert. In den so präparierten Hohlraum des Lagerelementes (xi) wurde ein Streifen der akitivierten PTFE-Folie (xii) mit einer Dicke von 0,5 mm eingelegt und mit der Innenbuchse (ix) vorgespannt. Die Innenbuchse bestand aus Stahl mit einer Höhe von 30 mm, einem Außendurchmesser von 38,5 mm und einem Innendurchmesser von 14,3 mm. Das fertig zusammengefügte Rundlager wurde bei einer Temperatur von 110°C über eine Dauer von 180 min getempert. Dabei wurde der Reaktionsprozess eingeleitet und ausgeführt. Das entsprechende Rundlager ist in der Figur 3 dargestellt, -wobei zur besseren Übersicht die Einzelteile (ix) , (x) , (xi) und (xii) auseinandergeschoben abgebildet sind. A reactive hot melt in powder form (Purbond® HCM VN 555-1) was applied to the surface of a cylindrical, hollow outer bushing (x) with a height of 30 mm, an outer diameter of 52 mm and a diameter of the cavity of 48 mm made of aluminum Collano company applied and melted at a temperature of 60 ° C for 30 min. A cylindrical, hollow bearing element (xi) with a height of 30 mm, an outer diameter of 48 mm and a diameter of the cavity of 38.5 mm was inserted into the outer bush (x) coated in this way. The reactive hot melt was also applied to the inner surface of the bearing element. A strip of the activated PTFE film (xii) with a thickness of 0.5 mm was inserted into the cavity of the bearing element (xi) prepared in this way and pretensioned with the inner bushing (ix). The inner bush was made of steel with a height of 30 mm, an outer diameter of 38.5 mm and an inner diameter of 14.3 mm. The assembled circular bearing was annealed at a temperature of 110 ° C for 180 minutes. The reaction process was initiated and carried out. The corresponding circular bearing is shown in FIG. 3, the individual parts (ix), (x), (xi) and (xii) being shown pushed apart for a better overview.

Claims

Patentansprüche claims
1. Polyurethanelastomer haftend verbunden mit Polytetrafluor- ethylen.1. Polyurethane elastomer adhesively bonded to polytetrafluoroethylene.
2. Polyurethanelastomer gemäß Anspruch 1, dadurch gekennzeichnet, dass das Polyurethanelastomer mit dem Polytetrafluorethylen mittels eines reaktiven Schmelzklebstoffs verklebt ist.2. Polyurethane elastomer according to claim 1, characterized in that the polyurethane elastomer is glued to the polytetrafluoroethylene by means of a reactive hot melt adhesive.
3. Polyurethanelastomer gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass es sich bei dem Polyurethanelastomer um ein zelliges Polyurethanelastomer mit einer Dichte nach DIN 53 420 von 200 bis 1100 kg/m3, einer Zugfestigkeit nach DIN 53 571 von größer 2 N/mm2, einer Dehnung nach DIN 53 571 von größer 300 % und einer Weiterreißfestigkeit nach DIN 53 515 von größer 8 N/mm handelt.3. Polyurethane elastomer according to claim 1 or 2, characterized in that it is a cellular polyurethane elastomer with a density according to DIN 53 420 of 200 to 1100 kg / m 3 , a tensile strength according to DIN 53 571 of greater than 2 N / mm in the polyurethane elastomer 2 , an elongation according to DIN 53 571 of greater than 300% and a tear resistance according to DIN 53 515 of greater than 8 N / mm.
4. Polyurethanelastomer gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass es sich bei dem Polyurethanelastomer um thermoplastisches Polyurethan handelt.4. Polyurethane elastomer according to claim 1 or 2, characterized in that the polyurethane elastomer is thermoplastic polyurethane.
5. Polyurethanelastomer gemäß Anspruch 2, dadurch gekenn- zeichnet, dass der reaktive Schmelzklebstoff auf der Basis verkapselter Isocyanate einen Schmelzbereich bei Temperaturen kleiner 5°C und einen Reaktionsbereich bei Temperaturen größer 100°C aufweist.5. Polyurethane elastomer according to claim 2, characterized in that the reactive hot melt adhesive based on encapsulated isocyanates has a melting range at temperatures below 5 ° C and a reaction range at temperatures above 100 ° C.
6. Polyurethanelastomer gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass es sich bei dem Polytetrafluorethylen um eine Polytetrafluorethylenfolie mit einer Dicke von 0,2 mm bis 5 mm handelt.6. Polyurethane elastomer according to one of claims 1 to 5, characterized in that the polytetrafluoroethylene is a polytetrafluoroethylene film with a thickness of 0.2 mm to 5 mm.
7. Elastisches Lager enthaltend Polyurethanelastomere gemäß einem der Ansprüche 1 bis 6.7. Elastic bearing containing polyurethane elastomers according to one of claims 1 to 6.
8. Elastisches Lager gemäß Anspruch 7, dadurch gekennzeichnet, dass das Lager mindestens zwei Polyurethanelastomere enthält, . die in unterschiedlicher Ausrichtung mit Polytetrafluorethylen kaschiert sind.8. Elastic bearing according to claim 7, characterized in that the bearing contains at least two polyurethane elastomers,. which are laminated with polytetrafluoroethylene in different orientations.
3 Zeichn. 3 drawings
9. Automobile oder Lastkraftwagen enthaltend elastische Lager gemäß Anspruch 7 oder 8.9. automobiles or trucks containing elastic bearings according to claim 7 or 8.
10. Verfahren zur Herstellung von Polyurethanelastomeren haftend verbunden mit Polytetrafluorethylenfolie, dadurch gekennzeichnet, dass man pulverisierte reaktive Schmelzklebstoffe auf der Basis von verkapselten Isocyanaten auf die zu verklebende Oberfläche des Polyurethanelastomers und/oder auf die zu verklebende Oberfläche der Polytetrafluorethylenfolie aufträgt, die pulverisierten reaktiven Schmelzklebstoffe bei einer Temperatur von 30°C bis 90°C aufschmilzt, die zu verklebenden Teile zueinander fixiert und anschließend den reaktiven Schmelzklebstoff durch Erhitzen auf eine Temperatur von größer 100°C aktiviert und durch Umsetzung des reaktiven Schmelzklebstoff die zu verklebende Polytetrafluorethylenfolie mit dem Polyurethanelastomer verklebt .10. A process for the production of polyurethane elastomers adhesively bonded to polytetrafluoroethylene film, characterized in that powdered reactive hot melt adhesives based on encapsulated isocyanates are applied to the surface of the polyurethane elastomer to be bonded and / or to the surface of the polytetrafluoroethylene film to be bonded, which contribute the powdered reactive hot melt adhesives melts at a temperature of 30 ° C to 90 ° C, fixes the parts to be bonded to each other and then activates the reactive hot melt adhesive by heating to a temperature of more than 100 ° C and by reacting the reactive hot melt adhesive, the polytetrafluoroethylene film to be bonded is bonded to the polyurethane elastomer.
11. Verfahren gemäß Anspruch 10, dadurch gekennzeichnet, dass man die Benetzbarkeit der zu verklebenden Oberfläche der Polytetrafluorethylenfolie erhöht, bevor diese Oberfläche mit dem reaktiven Schmelzklebstoff in Verbindung kommt.11. The method according to claim 10, characterized in that the wettability of the surface to be bonded of the polytetrafluoroethylene film is increased before this surface comes into contact with the reactive hot melt adhesive.
12. Verfahren gemäß Anspruch 11, dadurch gekennzeichnet, dass man die Oberflächen durch Ätzen, elektrische Entladungen oder Fluorierung für eine Verklebung aktiviert. 12. The method according to claim 11, characterized in that the surfaces are activated by etching, electrical discharges or fluorination for bonding.
EP03757017A 2002-06-10 2003-06-04 Polyurethane elastomer adhesively connected to polytetrafluorethylene and an elastic bearing containing one such polyurethane elastomer Withdrawn EP1516017A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10225793 2002-06-10
DE10225793A DE10225793A1 (en) 2002-06-10 2002-06-10 Polyurethane elastomer elastic supports bonded to PTFE in automobile construction, e.g. for films, tubes, plates, bars, and other profiled elements based on PTFE
PCT/EP2003/005820 WO2003104326A1 (en) 2002-06-10 2003-06-04 Polyurethane elastomer adhesively connected to polytetrafluorethylene and an elastic bearing containing one such polyurethane elastomer

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EP1516017A1 true EP1516017A1 (en) 2005-03-23

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EP03757017A Withdrawn EP1516017A1 (en) 2002-06-10 2003-06-04 Polyurethane elastomer adhesively connected to polytetrafluorethylene and an elastic bearing containing one such polyurethane elastomer

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EP (1) EP1516017A1 (en)
AU (1) AU2003242617A1 (en)
DE (1) DE10225793A1 (en)
WO (1) WO2003104326A1 (en)

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Publication number Priority date Publication date Assignee Title
EP4263187A1 (en) 2020-12-18 2023-10-25 BASF Polyurethanes GmbH Decoupling bushing on the basis of a cast elastomer

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
GB996764A (en) * 1961-08-18 1965-06-30 British Belting & Asbestos Ltd A new or improved bearing material
GB1111597A (en) * 1964-07-23 1968-05-01 Angus George Co Ltd Improvements relating to bearings having a fluorinated polymer sliding surface
JPS52132040A (en) * 1976-04-28 1977-11-05 Ishikawajima Harima Heavy Ind Co Ltd Adhesion of industrial materials
WO1992013205A1 (en) * 1991-01-28 1992-08-06 W.L. Gore & Associates, Inc. A bushing liner

Non-Patent Citations (1)

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Title
See references of WO03104326A1 *

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AU2003242617A1 (en) 2003-12-22
DE10225793A1 (en) 2003-12-18

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