DE1704663A1 - Process for sintering polytetrafluoroethylene foils - Google Patents

Process for sintering polytetrafluoroethylene foils

Info

Publication number
DE1704663A1
DE1704663A1 DE19671704663 DE1704663A DE1704663A1 DE 1704663 A1 DE1704663 A1 DE 1704663A1 DE 19671704663 DE19671704663 DE 19671704663 DE 1704663 A DE1704663 A DE 1704663A DE 1704663 A1 DE1704663 A1 DE 1704663A1
Authority
DE
Germany
Prior art keywords
polytetrafluoroethylene
sintering
rolling
film
foils
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
Application number
DE19671704663
Other languages
German (de)
Inventor
Andreas Consolati
Otfried Loercher
Robert Dr Steffen
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Publication of DE1704663A1 publication Critical patent/DE1704663A1/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/14—Homopolymers or copolymers of vinyl fluoride

Description

Beschreibung 11Verfahren zur Sinterung von PolYtetrafluoräthylen-Folien" Zusatz zu DBP . ... ... (Anmeldung F 53 763 X/39 a) Im deutschen Patent . ... ... (Anmeldung F 53 763 X/39 a) ist ein Verfahren zur Herstellung von planliegenden Folien aus Polytetrafluoräthylen nach einem Walz- und Sinterverfahren beschrieben, welches darin besteht, daß man pulverförmiges Polytetrafluoräthylen ohne Vorbehandlung und ohne Verarbeitungshilfsmittel bei Temperaturen von 100 bis 325°C walzt, bei 3?7 bis 4000C sintert und anschließend oder gleichzeitig auf die Folie einen Zug in Querrichtung, gegebenenfalls verbunden mit einer Querreckung, ausübt, vor allem, um die Wellenbildung der Folie in Längsrichtung und das Auftreten von Zonen ungleichmäßiger Dicken zu verhindern. Diese zusätzliche Behandlung der Polytetrafluoräthylen-Folie erfordert aufwendige Einrichtungen sowohl bezüglich der Anlage und ihrer Bedienung als auch bezüglich des Platzbedarfes.Description 11 process for sintering polytetrafluoroethylene foils " Addition to DBP. ... ... (Application F 53 763 X / 39 a) In the German patent. ... ... (Application F 53 763 X / 39 a) is a process for the production of flat-lying Foils made of polytetrafluoroethylene described by a rolling and sintering process, which consists in using powdered polytetrafluoroethylene without pretreatment and rolled without processing aids at temperatures of 100 to 325 ° C 3? 7 to 4000C and then or simultaneously a pull on the film in the transverse direction, possibly combined with a transverse stretch, in particular, around the corrugation of the film in the longitudinal direction and the appearance of uneven zones To prevent thick ones. This additional treatment of the polytetrafluoroethylene film requires complex facilities both with regard to the system and its operation as well as in terms of space requirements.

Es wurde nun gefunden, daß man die Wellenbildung der Folie in Längsrichtung und das Auftreten verschiedener Dickenzonen vermeiden und planliegende Polytetrafluoräthylen-Folien erhalten kann, durch Walzen von pulverförmigem Polytetrafluoräthylen ohne Vorbehandlung und ohne Verarbeitungshilfsmittel bei Temperaturen von 100 bis 325°C gemäß DBP . ... ... (Anmeldung F 53 763 X/39 a) wenn man die noch ungesinterte Walzfolie mittels eines endlosen Metallbandes un-ter möglichst großem Umschlingungswinkel gegen eine beheizte Walze drückt, deren Temperatur über dem Sinterpunkt des Polytetrafluoräthylens zweckmä#ig im Bereich von 327 b@@ 400°C, vorzugsweise bei 350°C liegt.It has now been found that the formation of waves in the film in the longitudinal direction and avoid the occurrence of different thickness zones and flat polytetrafluoroethylene films can be obtained by rolling powdered polytetrafluoroethylene without pretreatment and without processing aids at temperatures from 100 to 325 ° C according to DBP. ... ... (Registration F 53 763 X / 39 a) if you use the still unsintered rolled foil an endless metal band with the greatest possible angle of wrap against a heated roller presses whose temperature is above the sintering point of the Polytetrafluoroethylene is expediently in the range from 327 to 400 ° C, preferably at 350 ° C.

Die Gestaltung der erfindungsgemäßen, an sich einfachen Vorrichtung sowie deren Wirkungsweise ist aus Abbildung 1 ersichtlich, nach welcher die ungesinterte Polytetrafluoräthylen-Folie 1 über eine Andrückwalze 2 zusammen mit einem endlosen Metallband 3, welches über ein Walzensystem 6 unter Spannung gehalten wird, über eine beheizte Walze 4, deren Temperatur über dem Erweichungspunkt des Polytetrafluoräthylens liegt, geführt, gesintert und über eine Abzugswalze 5, der weiteren Behandlung, beispielsweise einer Aufwicklung, zugeführt wird.The design of the device according to the invention, which is simple in itself and its mode of operation can be seen in Figure 1, according to which the unsintered Polytetrafluoroethylene film 1 over a pressure roller 2 together with an endless one Metal strip 3, which is kept under tension by a roller system 6, over a heated roller 4, the temperature of which is above the softening point of polytetrafluoroethylene lies, guided, sintered and over a take-off roller 5, for further treatment, for example a winding, is supplied.

Die Behandlung der Folie wird zweckmäßig im Temperaturbereich von 327 bis 4000C, vorzugsweise bei 3500C durchgeführt, wobei eine Kontaktzeit von ca. 20 Sekunden ausreichend ist.The treatment of the film is expedient in the temperature range from 327 to 4000C, preferably carried out at 3500C, with a contact time of approx. 20 seconds is sufficient.

Maschinen, wie sie vorstehend beschrieben wurden, sind ar. sich bekannt, wenn auch im angegebenen Temperaturbereich bis jetzt noch nicht im Gebrauch. Daß man die an sich sehr empfindlichen Polytetrafluoräthylen-Folien mit Hilfe einer derartigen Vorrichtung sintern und gleichzeitig von einer unerwünschten Wellenbildung befreien und somit völlig pinliegende Folien gleichmäßiger Dicke erhalten kann, war nicht zu erwarten.Machines as described above are ar. known although not yet in use in the specified temperature range. That you the very sensitive polytetrafluoroethylene films with the help of a such a device sinter and at the same time from an undesirable wave formation free and thus completely pin-lying foils of uniform thickness can be obtained, was not to be expected.

Man erhält nach diesem erfindungsgemäßen Verfahren eine Folie, welche in ihren Eigenschaften den in DBP . ... ... (Anmeldung F 53 763 X/39 a) beschriebenen Polytetrafluoräthylen-Folien gleicht, und bei deren Herstellung im Vergleich zum vorbeschriebenen Verfahren erhebliche Kosten gespart werden.According to this process according to the invention, a film is obtained which in their properties those in DBP. ... ... (registration F 53 763 X / 39 a) Polytetrafluoroethylene films are the same, and in their manufacture compared to The above-described method can save considerable costs.

Claims (2)

Patentansrüche: 1) Verfahren zur Herstellung planliegender Folien aus Polytetrafluoräthylen in einem Walz-und und Sinterfahren durch Walzen von pulverförmigem Polytetrafluoräthylen ohne Vorbehandlung und ohne Verarbeitungshilfsmittel bei Temperaturen von 100 bis 32500 gemäß dem Verfahren des DBP . ... ... (Anmeldung F 53 763 X/39 a), dadurch gekennzeichnet, daß man die gewalzte, ungesinterte Folie mittels eines endlosen Metallbandes unter möglichst großem Umschlingungswinkel gegen eine beheizte Walze drückt, deren Temperatur oberhalb dem Sinterpunkt des Polytetrafluoräthylens liegt.Claims: 1) Process for the production of flat films from polytetrafluoroethylene in a rolling and sintering process by rolling powdery Polytetrafluoroethylene without pretreatment and without processing aids at temperatures from 100 to 32500 according to the procedure of the DBP. ... ... (registration F 53 763 X / 39 a), characterized in that the rolled, unsintered film by means of a endless metal belt with the largest possible angle of wrap against a heated one Roller presses whose temperature is above the sintering point of polytetrafluoroethylene lies. 2) Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Sinterung bei 327 bis 4000C, vorzugsweise bei 350°C ausgeführt wird.2) Method according to claim 1, characterized in that the sintering is carried out at 327 to 4000C, preferably at 350 ° C. LeerseiteBlank page
DE19671704663 1967-12-12 1967-12-12 Process for sintering polytetrafluoroethylene foils Pending DE1704663A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF0054288 1967-12-12

Publications (1)

Publication Number Publication Date
DE1704663A1 true DE1704663A1 (en) 1971-09-23

Family

ID=7106980

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19671704663 Pending DE1704663A1 (en) 1967-12-12 1967-12-12 Process for sintering polytetrafluoroethylene foils

Country Status (1)

Country Link
DE (1) DE1704663A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2413221A1 (en) * 1973-03-19 1974-10-17 Sumitomo Electric Industries PROCESS FOR THE PRODUCTION OF POROUS POLYTETRAFLUORAETHYLENE FILMS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2413221A1 (en) * 1973-03-19 1974-10-17 Sumitomo Electric Industries PROCESS FOR THE PRODUCTION OF POROUS POLYTETRAFLUORAETHYLENE FILMS

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