DE1011948B - Method for improving the adhesive strength of a conductive layer on hoses made of thermoplastics, in particular insulating sleeves for electrical conductors - Google Patents
Method for improving the adhesive strength of a conductive layer on hoses made of thermoplastics, in particular insulating sleeves for electrical conductorsInfo
- Publication number
- DE1011948B DE1011948B DES45366A DES0045366A DE1011948B DE 1011948 B DE1011948 B DE 1011948B DE S45366 A DES45366 A DE S45366A DE S0045366 A DES0045366 A DE S0045366A DE 1011948 B DE1011948 B DE 1011948B
- Authority
- DE
- Germany
- Prior art keywords
- conductive layer
- thermoplastics
- adhesive strength
- improving
- insulating sleeves
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
Verfahren zur Verbesserung der Haftfestigkeit einer leitfähigen Schicht auf Schläuchen aus thermoplastischen Kunststoffen, insbesondere Isolierhüllen elektrischer Leiter Bei Isolierschläuchen oder Isolierhüllen elektrischer Leiter, die für Betrieb bei höheren Spannungen bestimmt sind, ist es üblich, sie zur Vermeidung von Glimmererscheinungen mit einer halbleitenden Schutzschicht zu versehen. Bei Gummischläuchen oder -isolierhüllen wird diese halbleitende Schutzschicht in einfacher Weise dadurch erzeugt, daß über der isolierenden Gummischicht eine Schicht aus durch Ruß- oder Graphitbeimengung leitfähig gemachter Kautschukmischung aufgebracht wird, die durch Zusammenvulkanisation mit der darunterliegenden Isoliergummischicht gummihomogen vereinigt wird. Bei Schläuchen oder Isolierhüllen aus thermoplastischen Kunststoffen, beispielsweise Polymerisaten oder Mischpolymerisaten aus Polyvinylchlorid, ist eine solche Arbeitsweise nicht möglich. Die halbleitende Schicht wird deshalb durch Aufbringen eines leitfähigen Pulvers, z. B. Ruß- oder Graphitpulvers, erzeugt, das in Form einer Aufschlämmung in einem vorzugsweise leichtflüchtigen Lösungsmitel aufgetragen wird. Durch das Lösungsmittel soll gleichzeitig die Oberfläche des Isolierschlauches bzw. der Isolierhülle angelöst werden, so daß die Ruß- bzw. Graphitteilchen nach dem Verdunsten des Lösungsmittels an der Kunststoffhülle haften.Process for improving the adhesive strength of a conductive layer on hoses made of thermoplastics, in particular electrical insulating sleeves Conductor In the case of insulating hoses or insulating sleeves, electrical conductors are used for operation if higher voltages are intended, it is common practice to use them to avoid mica appearances to be provided with a semiconducting protective layer. With rubber hoses or insulating sleeves this semiconducting protective layer is produced in a simple manner that over the insulating rubber layer is a layer made by adding carbon black or graphite Conductive rubber mixture is applied, which is vulcanized together is combined rubber-homogeneously with the underlying insulating rubber layer. With hoses or insulating sleeves made of thermoplastics, for example polymers or copolymers of polyvinyl chloride, such a procedure is not possible. The semiconducting layer is therefore made conductive by applying a Powder, e.g. B. carbon black or graphite powder, generated in the form of a slurry is applied in a preferably volatile solvent. By the Solvent should also be used on the surface of the insulating tube or the insulating sleeve are dissolved, so that the soot or graphite particles after the solvent has evaporated adhere to the plastic cover.
Der Erfindung liegt das Bestreben zugrunde, die Haftfestigkeit einer leitfähigen Schicht aus einer Aufschlämmung von Ruß oder Graphit in einem leichtflüchtigen Lösungsmittel auf Schläuchen aus thermoplastischen Kunststoffen, z. B. Polymerisaten oder Mischpolymerisaten von Vinylchlorid, insbesondere Isolierhüllen elektrischer Leiter, zu verbessern. Das gelingt erfindungsgemäß in einfacher Weise dadurch, daß der Kunststoffschlauch mit der aufgebrachten leitfähigen Schicht kurzzeitig einer Temperatur ausgesetzt wird, die etwas über dem Erweichungspunkt des für den Kunststoffschlauch verwendeten thermoplastischen Materials liegt.The invention is based on the aim to improve the adhesive strength of a conductive layer of a slurry of carbon black or graphite in a volatile Solvents on hoses made of thermoplastics, e.g. B. Polymers or copolymers of vinyl chloride, especially electrical insulation Head to improve. This is achieved according to the invention in a simple manner in that the plastic tube with the applied conductive layer briefly one Temperature which is slightly above the softening point of the for the plastic tubing thermoplastic material used.
Eine solche Behandlung hat, wie Versuche gezeigt haben, den Erfolg, daß die halbleitende Schicht auch einem Abschaben mit einem Messer erheblichen Widerstand entgegensetzt, während ohne eine Behandlung gemäß der Erfindung das Graphit- bzw. Rußpulver verhältnismäßig leicht abgewischt werden kann.As tests have shown, such a treatment is successful, that the semiconducting layer also offers considerable resistance to scraping with a knife opposed, while without a treatment according to the invention the graphite or Soot powder can be wiped off relatively easily.
Die Erwärmung dies Kunststoffschlauches bzw. der Kunststoffhülle kann auf beliebige Weise erfolgen, beispielsweise kann sie durch eine Kammer hindurchgezogen werden, die direkt oder indirekt mittels beliebiger Wärmequellen auf die erforderliche Temperatur aufgeheizt ist. Man kann dafür aber auch eine Infrarotbestrahlung vorsehen. Ausführungsbeispiel Eine PVC-isolierte Ader wird durch eine Aufschlämmung von 30 Teilen Pudergraphit in 70 Teilen Tetrahydrofuran durchgezogen und senkrecht aus der Flüssigkeitsoberfläche herausgezogen, so daß der Überschuß der Suspension abläuft. Anschließend wird die Ader durch eine Heizkammer geführt, deren Innentemperatur je nach Durchmesser der Leitung und Durchzugsgeschwindigkeit 180 bis 250' beträgt.The heating of this plastic hose or the plastic sleeve can take place in any way, for example it can be pulled through a chamber directly or indirectly by means of any heat sources to the required Temperature is heated up. However, infrared radiation can also be provided for this. Exemplary embodiment A PVC-insulated wire is passed through a slurry of 30 Share powder graphite in 70 parts of tetrahydrofuran drawn through and vertically pulled out of the liquid surface, so that the excess of the suspension runs off. The wire is then passed through a heating chamber, the internal temperature of which depending on the diameter of the pipe and the speed at which it is pulled through, it is 180 to 250 '.
Die Erfindung kann für alle thermoplastischen Kunststoffe; z. B. Polyäthylen oder Polyamid, angewandt werden; es muß nur immer die Temperatur in der Heizkammer so reguliert werden, daß sie immer etwas über dem Erweichungspunkt des betreffenden Thermoplasten liegt.The invention can be used for all thermoplastics; z. B. polyethylene or polyamide, may be used; it just has to be the temperature in the heating chamber are regulated so that they are always slightly above the softening point of the relevant Thermoplastic lies.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES45366A DE1011948B (en) | 1955-08-31 | 1955-08-31 | Method for improving the adhesive strength of a conductive layer on hoses made of thermoplastics, in particular insulating sleeves for electrical conductors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES45366A DE1011948B (en) | 1955-08-31 | 1955-08-31 | Method for improving the adhesive strength of a conductive layer on hoses made of thermoplastics, in particular insulating sleeves for electrical conductors |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1011948B true DE1011948B (en) | 1957-07-11 |
Family
ID=7485523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES45366A Pending DE1011948B (en) | 1955-08-31 | 1955-08-31 | Method for improving the adhesive strength of a conductive layer on hoses made of thermoplastics, in particular insulating sleeves for electrical conductors |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1011948B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3104985A (en) * | 1959-01-06 | 1963-09-24 | Cabot Corp | Conducting polymer compositions |
DE1490625B1 (en) * | 1964-07-31 | 1969-09-04 | Siemens Ag | Method for applying a weakly conductive layer to the surface of plastic-insulated cables with the aid of a dispersion containing carbon black or graphite in particular |
DE2706475A1 (en) * | 1977-02-16 | 1978-08-17 | Kabel Metallwerke Ghh | Graphite layer application on cable insulation - involves series of rotating drums containing powder and several smoothing devices |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE836208C (en) * | 1948-11-12 | 1952-04-10 | Ward Blenkinsop & Co Ltd | Process for making printed electrical parts |
-
1955
- 1955-08-31 DE DES45366A patent/DE1011948B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE836208C (en) * | 1948-11-12 | 1952-04-10 | Ward Blenkinsop & Co Ltd | Process for making printed electrical parts |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3104985A (en) * | 1959-01-06 | 1963-09-24 | Cabot Corp | Conducting polymer compositions |
DE1490625B1 (en) * | 1964-07-31 | 1969-09-04 | Siemens Ag | Method for applying a weakly conductive layer to the surface of plastic-insulated cables with the aid of a dispersion containing carbon black or graphite in particular |
DE2706475A1 (en) * | 1977-02-16 | 1978-08-17 | Kabel Metallwerke Ghh | Graphite layer application on cable insulation - involves series of rotating drums containing powder and several smoothing devices |
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