EP1936035A1 - Tafel mit Lärm- und Splitterschutzeigenschaften auf der Basis von Kunstglas, Verfahren zu ihrer Herstellung und Verwendung dafür - Google Patents

Tafel mit Lärm- und Splitterschutzeigenschaften auf der Basis von Kunstglas, Verfahren zu ihrer Herstellung und Verwendung dafür Download PDF

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Publication number
EP1936035A1
EP1936035A1 EP07468012A EP07468012A EP1936035A1 EP 1936035 A1 EP1936035 A1 EP 1936035A1 EP 07468012 A EP07468012 A EP 07468012A EP 07468012 A EP07468012 A EP 07468012A EP 1936035 A1 EP1936035 A1 EP 1936035A1
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EP
European Patent Office
Prior art keywords
fibres
embedded
panel
mould
entanglement
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Granted
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EP07468012A
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English (en)
French (fr)
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EP1936035B1 (de
Inventor
Bostjan Japelj
Robert Krvavica
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Akripol proizvodnja in predelava polimerov dd
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Akripol proizvodnja in predelava polimerov dd
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Priority to SI200730160T priority Critical patent/SI1936035T1/sl
Priority to PL07468012T priority patent/PL1936035T3/pl
Publication of EP1936035A1 publication Critical patent/EP1936035A1/de
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Publication of EP1936035B1 publication Critical patent/EP1936035B1/de
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0017—Plate-like elements

Definitions

  • the present invention relates to panels on the basis of polymethylmethacrylate (so called acrylic glass) with embedded reinforcing polymer monofilament fibres in the form of a three-dimensional fibre entanglement, wherein the reinforcing polymer monofilament fibres are embedded into the polymethylmethacrylate matrix in such a manner that they are oriented in all directions and distributed apparently uniformly in all directions, so that the fibres are apparently uniformly distributed essentially throughout the entire cross-section of the panel i.e. throughout its entire volume.
  • the present invention also relates to a process for manufacturing such panels and to the use thereof.
  • the present invention particularly relates to transparent panels on the basis of polymethylmethacrylate (PMMA), into which polyacryl monofilament fibres in the form of a three-dimensional entanglement or a non-woven fabric are embedded apparently uniformly essentially throughout the entire cross-section of the panel or throughout its entire volume.
  • PMMA polymethylmethacrylate
  • These panels are particularly suitable as antinoise elements for noise barriers on highways, bridges, viaducts and similar as they also have, due to the built-in reinforcing polymer monofilament fibres, good antibreaking and antifragmentation properties in addition to antinoise properties.
  • Antinoise panels on the basis of acrylic glass with embedded reinforcing monofilament threads and their preparation have already been described in EP 0407852 A2 .
  • This document describes panels having, in relation to their cross-section, approximately centrally placed monofilament threads of plastic material (polyamide) or a grid netting made of such monofilament threads.
  • These panels are manufactured in such a manner that monofilament threads with a preferred diameter of 0.2 mm to 2 mm are strained across a mould, whereupon a prepolymer on the basis of acrylates is poured into the mould.
  • the threads are placed parallel to each other with a distance between the threads from 8 mm to 100 mm, and the threads may also be in the form of a net (i.e. the threads are placed at an angle of 90°).
  • EP 0826832 A2 describes antinoise panels with antifragmentation properties made of acrylic polymers and with embedded monofilament threads which, however, are not placed centrally with respect to the cross-section of the panel. It is described in the document that the threads are placed at a thickness between 20 and 35% of the total thickness of the panel and towards the surface opposite to the surface exposed to vehicles running into it. Thus, due to the position of the fibres, it is important which surface of the panel is exposed to crashes and impacts and the panel can be defined as a "two-sided" one with regard to its mechanical properties - one side of the panel is essentially more reinforced against mechanical stresses than the other.
  • monofilament threads generally have a diameter between 0.1 and 4 mm, preferably between 2 and 3 mm. Threads or bands made of threads are placed at a distance from 10 to 100 mm. Also in this case the included threads have an essentially planar structure (the threads are in one level) i.e. it is about strained threads, net or bands. The monofilament threads are strained across the mould either parallelly or in the form of bands or of a net. In the case of bands, they have a width of 5-25 mm and a thickness equal to that of the monofilament threads they are made of. The document neither describes in which manner the threads are built-in into the panel nor in which manner an appropriate position of the built-in threads in the course of the manufacturing process or at the polymerisation of PMMA is achieved.
  • EP 1119662 B1 ( WO 00/20690 A1 ) describes antinoise panels made of acrylic glass with monofilament threads embedded into the acrylic matrix with the aim of improving the antifragmentation properties of the panels and which have a maximal deviation of 1 mm or more, preferably 5 mm from an imaginary line running through the ends of this thread.
  • the polyamide or polypropylene threads can be inserted into the panel transversely or parallelly to the plane of the panel.
  • the threads can be embedded into the panel in such a way that they are parallel to each other and run in one direction, yet they can also run parallel to each other in several directions.
  • the diameter of the threads used is from 0.2 to 2.0 mm and the distance between them can be in a range between 8 and 100 mm.
  • the threads are placed in such a manner that a wavy arrangement of the threads is visible in the cross-section. Also in this case the threads are arranged parallelly and essentially planarly. From the examples it is evident that also in this process of manufacturing the panels the threads are inserted into the panel in such a manner that they are strained through the mould.
  • threads are embedded into a panel on the basis of acrylic polymers in such a manner that they are strained through a mould, whereupon the prepolymer forming a polymer matrix (e.g. PMMA) is poured into the mould.
  • a polymer matrix e.g. PMMA
  • the threads are strained in a specific exactly defined order or arrangement, which depends, inter alia, also on the straining tools, which results in non-enforced parts between parallelly arranged threads i.e. in places where only PMMA is present.
  • the present invention relates to panels on the basis of polymethylmethacrylate with embedded reinforcing polymer monofilament fibres in the form of a three-dimensional fibre entanglement, the fibres being embedded into the polymethylmethacrylate matrix in such a manner that they are oriented in all directions and distributed apparently uniformly in all directions, so that the fibres are apparently uniformly distributed essentially throughout the entire cross-section of the panel i.e. its entire volume.
  • the distribution throughout the essentially entire cross-section of the panel i.e. its entire volume means that the fibre entanglement is distributed throughout at least 90% of its entire cross-section or volume.
  • the reinforcing polymer monofilament fibres are embedded into the panel according to the invention in the form of a three-dimensional fibre entanglement or non-woven fabric.
  • the panels according to the invention are reinforced in all (three) directions. So far there have neither been known the existence of panels made of acrylic glass with embedded three-dimensional fibre entanglements nor the use of three-dimensional entanglements of polymer fibres in the process for manufacturing reinforced panels made of acrylic glass in order to reinforce and improve their antifragmentation properties.
  • the panels according to the present invention are especially suitable as antinoise elements (sound barriers) e.g. on highways, bridges, viaducts, they can also be used in facade building systems, for separation walls, balustrades and similar. Due to the monofilament fibres embedded into the panel throughout its entire cross-section, the panels according to the invention have improved antibreaking or antifragmentation properties as they can, e.g. in case of a vehicle crashing into the antinoise element along the road, prevent the falling off of any, even small broken particles of the antinoise element onto the roadway or into the surroundings.
  • the panels according to the invention may also be used in devices and machines where protection against the impact of particles is required and where panels made of non-reinforced PMMA or polycarbonate have hitherto been used for such protection. If a panel with embedded polymer, preferably polyamide fibres according to the invention should break, the built-in fibres prevent the formation and the falling-off of any, even small broken particles since these adhere to the built-in polyamide fibres.
  • the present invention also relates to a novel process for manufacturing panels on the basis of polymethylmethacrylate with embedded reinforcing polymer monofilament fibres in the form of a three-dimensional fibre entanglement.
  • the process for manufacturing the panels according to the invention runs in such a manner that
  • the process according to the invention there is no need for holding the inserted fibres in the mould in order to provide a uniform distribution of the fibres throughout the entire volume of the final panel since the used three-dimensional fibre entanglement has a sufficiently high strength for the fibres to remain fixed and not to subside due to their own weight.
  • a suitable arrangement of the fibres throughout the entire cross-section of the final panel is achieved by itself due to the thickness of the entanglement of the polyamide fibres (which is essentially the same as the thickness of the final product), which are thus distributed essentially throughout the entire volume of the panel.
  • the process according to the invention does not require additional straining mechanisms for straining the reinforcing polymer monofilament threads, which makes the process simpler and also shorter because it does not comprise the phase of straining the threads.
  • Suitable reinforcing monofilament polymer fibres used according to the present invention can be polyethylene, polycarbonate, polyamide or polypropylene fibres that are previously formed, e.g. by extrusion, into a three-dimensional fibre entanglement or non-woven fabric having the capability to retain the shape (thickness and width) throughout a long period of time.
  • the entanglement is essentially made of endless fibres.
  • polyamide monofilament fibres in the form of three-dimensional entanglement are embedded into a panel on the basis of polymethylmethacrylate.
  • the fibres, preferably polyamide fibres may have a diameter of 0.2 to 2 mm, preferably from 0.5 to 0.8 mm, particularly preferably 0.7 mm.
  • the mass of the three-dimensional entanglement of polymer monofilament fibres, preferably polyamide fibres, which can be used according to the invention, may range from 50 to 1000 g/m 2 .
  • the three-dimensional entanglement of polyamide fibres has a mass between 300 and 500 g/m 2 .
  • the panels may have thickness from 3 mm to 100 mm, preferably from 3 to 25 mm.
  • a fibre entanglement is embedded into the panel with the polyamide fibres having a diameter of 0.7 mm, the entanglement having a thickness of 13.5 ⁇ 0.5 mm and a weight of 380 ⁇ 20 g/m 2 , and the final panel having a thickness about 15 mm.
  • the mass of the embedded fibres represents about 2.5% of the total mass of the final product.
  • a reinforcing three-dimensional entanglement made of fibres of all colours can be embedded, which depends on the final purpose of the use of the product and also on the desired decorative effects.
  • an entanglement of fibres made of colourless (transparent) polyamide fibres is embedded into the panels.
  • the light passing through the panel refracts differently.
  • a sufficient visibility of the reinforcing entanglement in the panel can be provided by a suitable thickness and density of the fibres, whereby e.g. the probability for birds crashing into an otherwise transparent antinoise road element is diminished.
  • the panel according to the invention Due to the uniform distribution of the fibres in all directions and essentially throughout its entire volume, the panel according to the invention has the two sides with essentially the same mechanical properties. No so-called two-sidedness i.e. a difference in the properties of either side of the panel occurs, for which reason at setting up the panels onto the final object such as an antinoise road element, there is no need for taking care which side of the panel is directed towards the roadway.
  • the tensions occurring in the material at an impact against the panel can be transferred to a larger number of fibres.
  • the panel has a higher strength also due to the fact that the fibres are not "over-strained” i.e. there is no tension in them as a consequence of previous straining of the threads onto a framework or a mould in order to incorporate them into the panel. Therefore such a panel can withstand higher pressures and it can be expected that also small particles forming at a breakage of the panel will be left hanging on the embedded reinforcing fibres and at panel brake and will not fall into the surroundings, e.g. onto the roadway if the panels are used as noise barriers on the road.
  • the panels according to the invention contain more reinforcing fibres, which are more uniformly distributed throughout the entire volume of the panel, the impact strength of the panels is improved.
  • the impact strength takes more uniform values across the entire surface of the panel in comparison to the hitherto known panels where large non-reinforced gaps are present between parallelly arranged threads.
  • the novel process of manufacturing polymethylmethacrylate panels with embedded reinforcing polyamide monofilament fibres according to the invention runs, according to a preferred embodiment of the invention, in such a manner that first a methylmethacrylate monomer and additives commonly used in the art are dosed into a suitable reactor.
  • the additives that are used in small amounts and determine the properties of the acrylic glass or aid in the synthesis are azo and peroxy initiators, redox initiators, plasticizers, colourants (pigments, colours), de-moulding agents, optical whitening agents, UV stabilizers and other acrylates and methacrylates, especially butylacrylate, ethylacrylate, 2-ethylhexylacrylate, acrylic and methacrylic acid.
  • a prepolymer is prepared in such a way that a polymeryzation reaction of methylmethacrylate is set off up to a suitable conversion e.g. 10-30%, preferably 15-20%. Usually the reaction is completed in 1.5 hours.
  • the formed prepolymer of high viscosity is poured into mixing vessels and optionally also colourants and other additives such as peroxy initiators and cross-linkers are added. Now the prepolymer is prepared for casting.
  • the mould for casting the prepolymer is put together on a mould composing line.
  • First tempered glass plates which may be of various dimensions, are appropriately cleaned and dried.
  • a table for laying the seal which is preferably on the basis of polyvinylchloride (PVC)
  • PVC polyvinylchloride
  • a self-standing three-dimensional reinforcing entanglement of polymer monofilament fibres is placed and, in the next phase, onto this construction another tempered glass plate is placed.
  • a glass mould with an inserted reinforcing three-dimensional fibre entanglement preferably of polyamide fibres, and with a sealing placed at the edge is obtained.
  • the prepared prepolymer is gravimetrically dosed and poured into the composed moulds depending on the desired and required amount.
  • Filled moulds are placed vertically into special stands. As the three-dimensional entanglement has a sufficient fibre strength (i.e. is selfstanding), the fibres remain in the original position and do not subside or move.
  • the stands are placed into water basins with a temperature of 45-60°C. At this temperature the greatest part of polymerisation takes place within in a period of 5-15 hours.
  • the synthesis of the panels is finished in an air oven at a temperature of 100-130°C. In this phase the polymerisation is completed within a period of 2-5 hours. After the completed process the moulds are cooled and the panels are taken from the moulds.
  • the mechanical properties of the panels are determined by standard tests and methods established in the art.
  • the impact properties of the panels were determined by determining the Charpy impact toughness according to ISO 179 standard representing the energy required to break the material.
  • Figure 1 a panel with embedded reinforcing monofilament polyamide fibres in the form of a three-dimensional fibre entanglement is illustrated.
  • MMA methylmethacrylate
  • 2-EHA 2-ethylhexylacrylate
  • the prepared prepolymer was poured into a cup and, during constant stirring, commercially available peroxy initiators and the cross linker 1,4-butanedioldimethacrylate (1,4-BDDMA) were added.
  • the well-stirred mixture was filtered and poured into the prepared mould.
  • the mould was set into a water bath at 52°C for 12 hours for polymerization to occur.
  • the finished panel had a thickness of 15 mm.
  • Moulds were prepared in a mould-preparation line from two tempered glass plates having a thickness of 10 mm and a size of 2600 mm x 2100 mm and a PVC seal having a thickness of 19 mm.
  • the seal was placed on the edge of the bottom glass at approximately 30 mm from the edge and onto the glass a three-dimensional entanglement of colourless polyamide fibres Geomat Italgrimp, producer Greenvision Ambiente dilvesone Italdreni, Italy was placed so that the entanglement essentially covered the entire surface of the mould.
  • the entanglement had a thickness of 13.5 ⁇ 0.5 mm and a surface of 2000 mm x 2500 mm.
  • the thickness of single fibres was 0.4 ⁇ 0.03 mm, and the mass of the entanglement was 300 ⁇ 20 g/m 2 .
  • Partially finished moulds were covered by the second tempered glass and the moulds were compressed by fix clamps.
  • MMA methylmethacrylate
  • EA ethylacrylate
  • the prepared prepolymer was poured into a mixing vessel and, during constant stirring, commercially available azo and redox initiators and the cross linker 1,4-butanedioldimethacrylate (1,4-BDDMA) were added.
  • the panels were used for testings according to standards EN 1793 and EN 1794.
  • the panels correspond to values prescribed by the standards. Test on resistance against impact of stones showed that the panel remained undamaged even above 90 kJ (simulation of energy of stones).

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforced Plastic Materials (AREA)
  • Laminated Bodies (AREA)
  • Adornments (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Drawing Aids And Blackboards (AREA)
EP07468012A 2006-12-22 2007-12-07 Tafel mit Lärm- und Splitterschutzeigenschaften auf der Basis von Kunstglas, Verfahren zu ihrer Herstellung und Verwendung dafür Active EP1936035B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200730160T SI1936035T1 (sl) 2006-12-22 2007-12-07 Plošče s protihrupnimi in protifragmentacijskimi lastnostmi na osnovi akrilnega stekla postopek njihove izdelave in njihova uporaba
PL07468012T PL1936035T3 (pl) 2006-12-22 2007-12-07 Płyty o właściwościach antyhałasowych i antyfragmentacyjnych na bazie szkła akrylowego, sposób ich wykonania oraz ich zastosowanie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI200600290A SI22417A (sl) 2006-12-22 2006-12-22 Plošče s protihrupnim in protifragmentacijskimilastnostmi na osnovi akrilnega stekla, postopek njihove izdelave in njihova uporaba

Publications (2)

Publication Number Publication Date
EP1936035A1 true EP1936035A1 (de) 2008-06-25
EP1936035B1 EP1936035B1 (de) 2009-11-18

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EP07468012A Active EP1936035B1 (de) 2006-12-22 2007-12-07 Tafel mit Lärm- und Splitterschutzeigenschaften auf der Basis von Kunstglas, Verfahren zu ihrer Herstellung und Verwendung dafür

Country Status (5)

Country Link
EP (1) EP1936035B1 (de)
AT (1) ATE449213T1 (de)
DE (1) DE602007003300D1 (de)
PL (1) PL1936035T3 (de)
SI (2) SI22417A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2434055A1 (de) 2010-09-23 2012-03-28 Akripol proizvodnja in predelava polimerov, d.d. Faserverstärkte Acrylplatte und Verfahren zu deren Herstellung
WO2012038961A1 (en) 2010-09-21 2012-03-29 Plazit Iberica Plastic Solutions, S.A. Reinforced acrylic glass panels
EP2824239A1 (de) 2013-07-10 2015-01-14 Center of Excellence for Polymer Materials and Technologies (PoliMaT) Verstärkte Polymerplatten
WO2017155477A1 (en) 2016-03-06 2017-09-14 Akripol Proizvodnja In Predelava Polimerov, D.O.O. Method for panel manufacturing, particularly anti-noise

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824077C1 (de) * 1988-07-15 1989-11-09 Degussa Ag, 6000 Frankfurt, De
EP0407852A2 (de) 1989-07-13 1991-01-16 Degussa Aktiengesellschaft Als Lärmschutzelemente geeignete Platten aus Acrylglas
EP0826832A2 (de) 1996-08-28 1998-03-04 Atohaas Holding C.V. Splitterschutzscheiben aus Polymethylmethacrylat
WO2000020690A1 (de) 1998-10-06 2000-04-13 Röhm Gesellschaft Mit Beschränkter Haftung Als lärmschutzwand geeignete platte
EP1008692A2 (de) * 1998-11-30 2000-06-14 Polartherm-Flachglas GmbH Transparentes Lärmschutzwandelement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824077C1 (de) * 1988-07-15 1989-11-09 Degussa Ag, 6000 Frankfurt, De
EP0407852A2 (de) 1989-07-13 1991-01-16 Degussa Aktiengesellschaft Als Lärmschutzelemente geeignete Platten aus Acrylglas
EP0826832A2 (de) 1996-08-28 1998-03-04 Atohaas Holding C.V. Splitterschutzscheiben aus Polymethylmethacrylat
WO2000020690A1 (de) 1998-10-06 2000-04-13 Röhm Gesellschaft Mit Beschränkter Haftung Als lärmschutzwand geeignete platte
EP1119662B1 (de) 1998-10-06 2006-06-21 Röhm GmbH & Co. KG Als lärmschutzwand geeignete platte
EP1008692A2 (de) * 1998-11-30 2000-06-14 Polartherm-Flachglas GmbH Transparentes Lärmschutzwandelement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012038961A1 (en) 2010-09-21 2012-03-29 Plazit Iberica Plastic Solutions, S.A. Reinforced acrylic glass panels
EP2434055A1 (de) 2010-09-23 2012-03-28 Akripol proizvodnja in predelava polimerov, d.d. Faserverstärkte Acrylplatte und Verfahren zu deren Herstellung
EP2824239A1 (de) 2013-07-10 2015-01-14 Center of Excellence for Polymer Materials and Technologies (PoliMaT) Verstärkte Polymerplatten
WO2017155477A1 (en) 2016-03-06 2017-09-14 Akripol Proizvodnja In Predelava Polimerov, D.O.O. Method for panel manufacturing, particularly anti-noise

Also Published As

Publication number Publication date
EP1936035B1 (de) 2009-11-18
ATE449213T1 (de) 2009-12-15
SI1936035T1 (sl) 2010-03-31
DE602007003300D1 (de) 2009-12-31
PL1936035T3 (pl) 2010-04-30
SI22417A (sl) 2008-06-30

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