EP0456554A2 - Elektrisch leitendes Element und Verfahren zur Herstellung desselben - Google Patents

Elektrisch leitendes Element und Verfahren zur Herstellung desselben Download PDF

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Publication number
EP0456554A2
EP0456554A2 EP91401141A EP91401141A EP0456554A2 EP 0456554 A2 EP0456554 A2 EP 0456554A2 EP 91401141 A EP91401141 A EP 91401141A EP 91401141 A EP91401141 A EP 91401141A EP 0456554 A2 EP0456554 A2 EP 0456554A2
Authority
EP
European Patent Office
Prior art keywords
base
element according
flame retardant
substance
conductive material
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.)
Granted
Application number
EP91401141A
Other languages
English (en)
French (fr)
Other versions
EP0456554B1 (de
EP0456554A3 (en
Inventor
Lothar Bihy
Thomas Gaisbauer
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.)
Gruenzweig und Hartmann und Glasfaser AG
Saint Gobain Isover SA France
Original Assignee
Gruenzweig und Hartmann und Glasfaser AG
Saint Gobain Isover SA France
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 Gruenzweig und Hartmann und Glasfaser AG, Saint Gobain Isover SA France filed Critical Gruenzweig und Hartmann und Glasfaser AG
Publication of EP0456554A2 publication Critical patent/EP0456554A2/de
Publication of EP0456554A3 publication Critical patent/EP0456554A3/fr
Application granted granted Critical
Publication of EP0456554B1 publication Critical patent/EP0456554B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/92—Fire or heat protection feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/92—Fire or heat protection feature
    • Y10S428/921—Fire or flameproofing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2418—Coating or impregnation increases electrical conductivity or anti-static quality
    • Y10T442/2426—Elemental carbon containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2631—Coating or impregnation provides heat or fire protection

Definitions

  • the invention relates to an electrically conductive element intended more particularly for the production of elements for absorbing electromagnetic waves, in particular radar waves.
  • the invention also relates to a method of manufacturing such an electrically conductive surface element.
  • Such absorbers are for example obtained by filling a frame similar to a cassette, alternately by insulating elements in mineral wool and electrically conductive elements, the laminated structure thus obtained being fixed to the building by means of the frame.
  • EP-A-414 613 is described a more industrial process for manufacturing such absorbing elements obtained by stacking strips of mineral wool between which are inserted conductive elements electrics obtained for example by impregnating graphite with a nonwoven or constituted by a nonwoven of carbon fibers, the assembly then being cut by vertical cutting and applied to a support strip.
  • the lamellar structure can only be obtained on the condition of using binders with mineral wool, binders which lead to products of a combustible nature. Character reinforced by the very combustible nature of the conductive material which permeates the conductive elements.
  • the object of the invention is to provide an electrical conductive element making it possible to constitute, with an economical manufacturing process, elements which absorb electromagnetic waves, in particular radar waves, which are non-combustible, possibly satisfying the fire resistance tests required for construction materials.
  • this object is achieved by an electrically conductive element - intended for the constitution of electromagnetic wave absorbers used for the production of facades - consisting of a nonwoven base, impregnated with a flame retardant substance , with which an electromagnetically active conductive material is applied, by a printing process.
  • the element according to the invention is therefore distinguished from the prior art by the presence of a flame retardant substance on the nonwoven base.
  • the absorbers constructed with such an element satisfy the fire resistance tests allowing their classification as non-combustible combustion materials of class A in accordance with standard DIN 4102.
  • the added flame retardant substance compensates for degradations in fire behavior due to the application of a conductive material fuel and the use of binders.
  • the quantity of conductive material applied no longer has to be limited as a function of the desired fire behavior and can therefore be chosen only as a function of the expected absorption behavior.
  • the application of the electromagnetically active conductive material by a printing process also offers the advantage of making industrial production possible with particularly close tolerances of the quantities applied, from which it results the possibility of obtaining very absorbent selective.
  • the techniques of application by immersion, deposit with a brush or doctor blade or by spraying do not allow a suitable and constant distribution of the material, under the usual industrial conditions.
  • printing process is preferably meant a screen printing process, the conductive material - in this case preferably carbon black or graphite - being dispersed in a paint base.
  • the conductive material in this case preferably carbon black or graphite - being dispersed in a paint base.
  • the base of the element is made of a nonwoven, preferably of the veil type of glass fibers, which is particularly effective for the constitution of an absorber with a lamellar structure.
  • layers alternating strips of mineral wool and veil of glass fibers will be fixed in particular by gluing on a flat support.
  • a flame-retardant substance it is more particularly advantageous to use a material which exhibits an endothermic modification of its structure before reaching the maximum admissible temperature.
  • Accumulators with a high content of water of crystallization are particularly suitable for this purpose. In the event of a fire, at critical temperatures, release and vaporization of the water of crystallization is observed; a significant slowing down effect is then obtained which can be determined with precision over time.
  • Aluminum hydroxide is mainly suitable for this purpose and preferably finds its application with an extremely low binder content, less than 5% based on the dry weight. Can also be used as accumulators hydrated aluminum oxide and dehydrated sodium sulfate.
  • the fireproofing of the nonwoven base is preferably carried out by impregnation before proceeding with the application of the conductive material.
  • the inorganic flame retardant is thus applied in a relatively large amount, in a separate operation.
  • FIG. 1 represents a planar element produced in the form of a mat having a layered structure formed by layers 2 of mineral wool alternating with narrower strips 3 of an electrically conductive element according to the invention, the assembly forming a system with several layers absorbing the waves scattered by a radar.
  • the insulating layers 2 and the conductive strips 3 can be applied separately to a building facade, by gluing, pegging, wedging or in any other way. In the present case, however, they are deposited on a sheet 4, for example a sheet of reinforced aluminum.
  • the layered structure 1 is arranged in a cassette-shaped frame, not shown here, which is used for fixing between the masonry and the outer face constituted by a glass plate, or any other cladding plate in any other material.
  • the electromagnetic waves reaching the outer cladding plate penetrate largely without reflection through the cladding plate and are substantially absorbed in the layered structure. This results in a weak reflection on the facade.
  • the strips 3 advantageously consist of a veil of glass fibers forming the base of the electrically conductive element.
  • the electromagnetic conductive substance and a flame retardant substance are incorporated in the glass fibers, which are decisive substances for damping the reflection of the facade.
  • the base is preferably made of a veil of glass fibers but other veils and other materials, for example a thin sheet, can also be used.
  • carbon black or graphite or another electrically conductive material is preferably used. These materials must be dispersible.
  • the distances between two conductive elements 3 are chosen as a function of the wavelength of the electromagnetic waves to be absorbed, so that there is within the element, absorption, in particular absorption by resonance of the penetrating waves. Furthermore, the degree of absorption depends very closely on the distribution and the quantity of the conductive material.
  • a regular distribution of the conductive material on the flat element with a very narrow application tolerance is obtained by a printing process. In this case, a quick-setting colored dispersion, enriched with material, is used as the ink.
  • conductive for example in carbon black.
  • the screen printing process is particularly suitable for respecting close tolerances.
  • a printing ink specially suitable for screen printing contains organic substances such as emulsifiers, binders and fillers. The printing process thus leads to a relatively significant organic enrichment of the planar element, which certainly results in a layered structure having a high absorption power, but can simultaneously lead to a degradation of the fire resistance.
  • a flame-retardant substance is applied in an amount such that it forms on the web, an insulating layer which improves the fire content.
  • aluminum hydroxide and an extremely low binder content is suitable as a substance.
  • Aluminum hydroxide is an accumulation material with a high content of water of crystallization, released in the event of fire.
  • hydrated aluminum oxide, hydrated sodium metasilicate or dehydrated sodium sulphate can also be used.
  • the process of applying the dispersion of ink containing carbon black is carried out in an additional coating operation. .
  • the screen printing process leads to an economical consumption of carbon black with low application tolerances.
  • the dispersion of liquid ink consists of 70% water and 30% of solids formed by 5% of carbon black, 5% of dispersion auxiliaries and 20% of binder and filler.
  • Chalk can for example be chosen as a filler. In this case, it was possible to obtain an excellent absorption behavior of the constant radar throughout the surface of the conducting element.
  • the diagram in Figure 2 shows the depreciation of the reflection of microwaves at 600 MHz as a function of the quantity of carbon black incorporated into a veil of glass fibers, previously flame retardant, with a basis weight of 60 g per m2.
  • This diagram shows very clearly that for elements comprising a quantity of carbon black of 9 to 16 g per m2, a very good damping of the reflection, of -11.5 to -15 dB, can be obtained.
  • the optimal range is at an applied amount of carbon black of 10 to 12 g per m2.
  • the damping in reflection of the element in question thus measured in a waveguide gives the direct correlation with the damping of reflection desired of a facade element, for the usual radar frequencies of 1.03 to 1.09 GHz. In this way, a reflection damping of -13.5 to -15 dB could be obtained.
  • the particular effect obtained by means of the measurements in accordance with the invention can be qualified physically as a combined interference and absorption effect for electromagnetic waves. It can also be attributed essentially to an appropriate incorporation of the carbon black particles within the particles forming the ink dispersion and to the conductivity structure which is thus established.
  • the screen printing technique leads to a uniform and economical distribution of carbon black particles within the ink dispersion on the veil of glass fibers. This results in a coating with carbon black with very narrow application tolerances and thus optimal damping of the reflection.
  • the reproducibility of planar conductive elements having defined absorption properties is an advantage in this case.

Landscapes

  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Building Environments (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • Aerials With Secondary Devices (AREA)
  • Laminated Bodies (AREA)
  • Thermistors And Varistors (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
EP91401141A 1990-05-06 1991-04-30 Elektrisch leitendes Element und Verfahren zur Herstellung desselben Expired - Lifetime EP0456554B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4014453A DE4014453C2 (de) 1990-05-06 1990-05-06 Elektrisch leitfähiges Flächenelement sowie Verfahren zur Herstellung desselben
DE4014453 1990-05-06

Publications (3)

Publication Number Publication Date
EP0456554A2 true EP0456554A2 (de) 1991-11-13
EP0456554A3 EP0456554A3 (en) 1993-09-29
EP0456554B1 EP0456554B1 (de) 1997-03-12

Family

ID=6405772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401141A Expired - Lifetime EP0456554B1 (de) 1990-05-06 1991-04-30 Elektrisch leitendes Element und Verfahren zur Herstellung desselben

Country Status (8)

Country Link
US (1) US5223327A (de)
EP (1) EP0456554B1 (de)
JP (1) JP2971168B2 (de)
AT (1) ATE150216T1 (de)
CA (1) CA2041823A1 (de)
DE (2) DE4014453C2 (de)
DK (1) DK0456554T3 (de)
ES (1) ES2099144T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0795927A1 (de) * 1996-03-15 1997-09-17 Daimler-Benz Aerospace Aktiengesellschaft Elektromagnetische Wellen absorbierender Fassadenaufbau von Gebäuden

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4215954A1 (de) * 1992-02-04 1993-08-05 Rheinhold & Mahla Ag Absorber fuer elektromagnetische wellen
US5840383A (en) * 1996-02-12 1998-11-24 Bgf Industries, Inc. Electromagnetic wave reflective fabric
CN1227676A (zh) * 1996-08-07 1999-09-01 西门子公司 用于制造绝缘编织层的弱导电材料
IT1289932B1 (it) * 1997-02-19 1998-10-19 Indutex S R L Tessuto non tessuto presentante caratteristiche antistatiche e utilizzabile in vari campi
DE19717682A1 (de) * 1997-04-28 1998-10-29 Helmut Dr Reichelt Beschichtungsmaterial für Strahlungsflächen zur Erzeugung elektromagnetischer Wellen und Verfahren zu dessen Herstellung
DE19747622A1 (de) * 1997-10-28 1999-04-29 Gruenzweig & Hartmann Dämmplatten mit einer Abschirmung gegen elektromagnetische Felder
JP3983404B2 (ja) * 1999-01-13 2007-09-26 本田技研工業株式会社 レーダ搭載車両用ゲート
DE19942882B4 (de) * 1999-09-08 2005-11-03 Sto Ag Armierung
US7686061B2 (en) * 2002-04-24 2010-03-30 Overhead Door Corporation Winding assembly for door counterbalance system
US7846546B2 (en) * 2005-09-20 2010-12-07 Ube Industries, Ltd. Electrically conducting-inorganic substance-containing silicon carbide-based fine particles, electromagnetic wave absorbing material and electromagnetic wave absorber
CN108716063A (zh) * 2018-06-25 2018-10-30 中原工学院 一种导电阻燃抗菌纤维水刺非织造防屏蔽材料的制备方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0795927A1 (de) * 1996-03-15 1997-09-17 Daimler-Benz Aerospace Aktiengesellschaft Elektromagnetische Wellen absorbierender Fassadenaufbau von Gebäuden

Also Published As

Publication number Publication date
DE69125049D1 (de) 1997-04-17
DE69125049T2 (de) 1997-06-19
DE4014453A1 (de) 1991-11-14
JPH04229698A (ja) 1992-08-19
DK0456554T3 (da) 1997-08-18
JP2971168B2 (ja) 1999-11-02
EP0456554B1 (de) 1997-03-12
US5223327A (en) 1993-06-29
ATE150216T1 (de) 1997-03-15
DE4014453C2 (de) 1994-09-08
CA2041823A1 (fr) 1991-11-07
EP0456554A3 (en) 1993-09-29
ES2099144T3 (es) 1997-05-16

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