DE3044285A1 - Rubber with pressure dependent electrical conductivity - contains metal particles and conducting fibres giving better long term performance - Google Patents

Rubber with pressure dependent electrical conductivity - contains metal particles and conducting fibres giving better long term performance

Info

Publication number
DE3044285A1
DE3044285A1 DE19803044285 DE3044285A DE3044285A1 DE 3044285 A1 DE3044285 A1 DE 3044285A1 DE 19803044285 DE19803044285 DE 19803044285 DE 3044285 A DE3044285 A DE 3044285A DE 3044285 A1 DE3044285 A1 DE 3044285A1
Authority
DE
Germany
Prior art keywords
electrical conductivity
metal particles
long term
rubber
contains metal
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Withdrawn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
DE19803044285
Other languages
German (de)
Inventor
Lothar 7910 Neu-Ulm Quick
Günther Dr. Wilhelm
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.)
Reinz Dichtungs GmbH
Original Assignee
Reinz Dichtungs GmbH
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 Reinz Dichtungs GmbH filed Critical Reinz Dichtungs GmbH
Priority to DE19803044285 priority Critical patent/DE3044285A1/en
Publication of DE3044285A1 publication Critical patent/DE3044285A1/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01CRESISTORS
    • H01C10/00Adjustable resistors
    • H01C10/10Adjustable resistors adjustable by mechanical pressure or force
    • H01C10/12Adjustable resistors adjustable by mechanical pressure or force by changing surface pressure between resistive masses or resistive and conductive masses, e.g. pile type

Abstract

A natural or synthetic rubber-elastic material contains electrically conducting metal particles introduced into it before the crosslinking stage. In addition, the material also contains uniformly distributed, electrically conducting fibres, esp. graphite fibres. By incorporating conducting fibres as well as conducting particles, the loss of conductivity with time normally experienced in such materials is greatly reduced and therefore the material is more suitable for long term use, for example in electrically conducting seals.

Description

Gummielastisches Material mit druckab- Elastic material with pressure-resistant

hängiger elektrischer Leitfähigkeit Die Erfindung betrifft ein gummielastisches Material mit darin eingelagerten Metallpartikeln mit der besonderen Eigenschaft der druckabhängigen elektrischen Leitfähigkeit. pendent electrical conductivity The invention relates to a rubber-elastic Material with embedded metal particles with the special property the pressure-dependent electrical conductivity.

Natürliche oder synthetische Kautschuke verhalten sich dielektrisch, d. h. sie sind elektrisch nicht leitend. Werden jedoch in dieses Dielektrikum elektrisch leitfähige Partikel in genügendem Ausmaße eingelagert, so kommen bei Druckbelastung infolge der elastischen Verformung diese Partikel zur gegenseitigen Berührung, wodurch eine elektrische Leitfähigkeit erzeugt wird, die mit der Druckhöhe ansteigt.Natural or synthetic rubbers behave dielectrically, d. H. they are not electrically conductive. However, they become electrical in this dielectric Conductive particles are stored in sufficient quantities, so come under pressure due to the elastic deformation these particles come into mutual contact, whereby an electrical conductivity is generated, which increases with the pressure height.

Derart elektrisch leitend gemachte Elastomere haben ein weites Anwendungsgebiet als Druckschalter, Bremslichtschalter, Fahrzeugkupplungen oder als elektrisch leitfähige Abdichtungen. Von den Elastomeren hat sich besonders luftvernetzender Silikonkautschuk als geeignet erwiesen, in den bis zu 40% Metallpartikel eingelagert sind.Elastomers made electrically conductive in this way have a wide range of applications as pressure switches, brake light switches, vehicle clutches or as electrically conductive ones Waterproofing. Among the elastomers, silicone rubber that cross-links with air is particularly popular proved to be suitable, in which up to 40% metal particles are embedded.

Als nachteilig hat sich jedoch herausgestellt, daß aufgrund des rheologischen Verhaltens der Elastomere der Grad der elektrischen Leitfähigkeit bei gleichbleibendem Druck im Laufe der Zeit abnimmt. Dieser zeitabhängige Abfall der elektrischen Leitfähigkeit ist dort jedoch von erheblichem Nachteil, wo sie funkw -snsbedingt über einen rel.. langen Zeitraum erhalten bleiben muß, z. B. bei elektrisch leitfähigen Abdichtungen.However, it has been found to be disadvantageous that due to the rheological Behavior of the elastomers the degree of electrical conductivity with constant Pressure decreases over time. This time-dependent drop in electrical conductivity is There, however, a considerable disadvantage, where they have funkw -sns via a rel. must be maintained for a long period of time, e.g. B. with electrically conductive seals.

Es ist daher Aufgabe der vorliegenden Erfindung, druckabhängiges leitfähiges Material aus Elastomeren zu schaffen, das seine Leitfähigkeit auch über eine längere Zeitdauer ohne nennenswerten Abfall beibehält.It is therefore an object of the present invention to provide pressure-dependent conductive To create material made of elastomers, that its conductivity also over a longer period of time Maintains duration without significant drop.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß dem noch nicht ausgehärteten Elastomer außer den elektrisch leitfähigen Partikeln aus z. B. Aluminium noch ein bestimmter Anteil gleichmäßig verteilter elektrisch leitender Fasern, vorzugsweise Grafitfasern zugesetzt werden.According to the invention this object is achieved in that not yet cured elastomer except for the electrically conductive particles of z. B. aluminum a certain proportion of evenly distributed electrically conductive fibers, preferably Graphite fibers are added.

Umfangreiche Versuche und Zeitdauermessungen haben gezeigt, daß das erfindungsgemäße Material in seinem rheologischen Verhalten derart stabilisiert wurde, daß auch über eine längere Zeitdauer der Druckeinwirkung kein meßbarer Abfall der elektrischen Leitfähigkeit auftritt.Extensive tests and measurements over time have shown that the Material according to the invention stabilized in its rheological behavior in this way it became clear that no measurable drop was observed even over a longer period of time under the influence of pressure electrical conductivity occurs.

Als besonders "elektrisch zeitstandfest" hat sich ein Material aus luftvernetztem Silikonkautschuk erwiesen mit ca. 30 Vol.% Aluminiumpartikeln und ca. 10 Vol.One material has proven to be particularly "electrically resistant to creep" air-crosslinked silicone rubber has been shown to contain approx. 30% by volume of aluminum particles and approx. 10 vol.

Grafitfasern mit einer Faserlänge von 1-6 mm, vorzugsweise 3 mm und einem mittleren Durchmesser von 14 .Graphite fibers with a fiber length of 1-6 mm, preferably 3 mm and a mean diameter of 14.

Der Erfindungsgedanke umfaßt sinngemäß auch andere faserähnliche Gebilde, wie Späne, Metallwolle u.The idea of the invention also includes other fiber-like structures, such as chips, metal wool, etc.

Das Diagramm Fig. 1 zeigt in schematischer Darstellung den Verlauf der elektrischen Leitfähigkeit über der Zeitdauer bei konstantem Druck.The diagram in FIG. 1 shows the course in a schematic representation the electrical conductivity over time at constant pressure.

Die Kurve a entspricht dem Verhalten von erfindungsgemäßem elektrisch leitfähig gemachtem Material, während Kurve b den Verlauf der elektrischen Leitfähigkeit von bekanntem Material darstellt.The curve a corresponds to the behavior of electrical according to the invention made conductive material, while curve b shows the course of the electrical conductivity of known material.

L e e r s e i t eL e r s e i t e

Claims (1)

.Patentanspruch Gummielastisches Material natürlicher oder synthetischer Art mit darin vor dem Vernetzen eingebrachten elektrisch leitfähigen Metallpartikeln, dadurch gekennzeichnet, daß zusätzlich gleichmäßig verteilte elektrisch leitfähige Fasern, vorzugsweise Grafitfasern, darin enthalten sind. .Patent claim Rubber elastic material natural or synthetic Type with electrically conductive metal particles introduced into it prior to crosslinking, characterized in that additionally evenly distributed electrically conductive Fibers, preferably graphite fibers, are contained therein.
DE19803044285 1980-11-25 1980-11-25 Rubber with pressure dependent electrical conductivity - contains metal particles and conducting fibres giving better long term performance Withdrawn DE3044285A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803044285 DE3044285A1 (en) 1980-11-25 1980-11-25 Rubber with pressure dependent electrical conductivity - contains metal particles and conducting fibres giving better long term performance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803044285 DE3044285A1 (en) 1980-11-25 1980-11-25 Rubber with pressure dependent electrical conductivity - contains metal particles and conducting fibres giving better long term performance

Publications (1)

Publication Number Publication Date
DE3044285A1 true DE3044285A1 (en) 1982-06-16

Family

ID=6117481

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19803044285 Withdrawn DE3044285A1 (en) 1980-11-25 1980-11-25 Rubber with pressure dependent electrical conductivity - contains metal particles and conducting fibres giving better long term performance

Country Status (1)

Country Link
DE (1) DE3044285A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3386067A (en) * 1967-04-24 1968-05-28 Raphael J. Costanzo Pressure-sensitive electrical switch and application therefor
DE2652638A1 (en) * 1976-11-19 1978-05-24 Extraktionstechnik Gmbh DEVICE FOR THE CONTINUOUS EXTRACTION OF PERCOLATION-CAPABLE PROCESSED GOODS BY USING LIQUID SOLVENTS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3386067A (en) * 1967-04-24 1968-05-28 Raphael J. Costanzo Pressure-sensitive electrical switch and application therefor
DE2652638A1 (en) * 1976-11-19 1978-05-24 Extraktionstechnik Gmbh DEVICE FOR THE CONTINUOUS EXTRACTION OF PERCOLATION-CAPABLE PROCESSED GOODS BY USING LIQUID SOLVENTS

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