DE4426072C1 - Prodn. of teflon dispersion for coating a metal surface - Google Patents

Prodn. of teflon dispersion for coating a metal surface

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Publication number
DE4426072C1
DE4426072C1 DE19944426072 DE4426072A DE4426072C1 DE 4426072 C1 DE4426072 C1 DE 4426072C1 DE 19944426072 DE19944426072 DE 19944426072 DE 4426072 A DE4426072 A DE 4426072A DE 4426072 C1 DE4426072 C1 DE 4426072C1
Authority
DE
Germany
Prior art keywords
dispersion
teflon
coating
metal surface
teflon dispersion
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.)
Expired - Fee Related
Application number
DE19944426072
Other languages
German (de)
Inventor
Christoph Dr Mark
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19944426072 priority Critical patent/DE4426072C1/en
Application granted granted Critical
Publication of DE4426072C1 publication Critical patent/DE4426072C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
    • C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
    • 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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on 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; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on 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; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on 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; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
    • 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
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

To prepare a dispersion of Teflon (RTM), for coating a metal surface, a solvent is prepared for the dispersion from a perfluoroalkane group, free of fluorohydrocarbons which is easily evaporated but not combustible. The solvent is exchanged for the alcohol in a conventional Teflon (RTM) dispersion through azeotropic distillation.

Description

Es ist bekannt, daß in organischen Lösemittel dispergiertes Teflon zur Beschichtung von Oberflächen eingesetzt werden kann. Nach dem Auftragen der Dispersion verdampft das Lösemittel und hinterläßt einen dünnen Film aus Teflon auf dem Werkstück. So behandelte Teile zeichnen sich durch hervorragende Antihafteigenschaften und niedrige Reibungskoeffizienten aus.It is known that Teflon dispersed in organic solvents for coating of surfaces can be used. After applying the dispersion evaporates the solvent and leaves a thin film of Teflon on the Workpiece. Parts treated in this way are characterized by excellent Non-stick properties and low friction coefficients.

Als organische Lösemittel hat man vorzugsweise Fluorchlorkohlenwasserstoffe (FCKW) eingesetzt, da diese leicht verdampfbar und nicht brennbar sind. Seit jedoch bekannt ist, daß FCKW zum Abbau der Ozonschicht um die Erde beitragen, wird ein generelles Herstell- und Anwendungsverbot für diese Substanzklasse angestrebt.Fluorochlorohydrocarbons are preferred as organic solvents (CFCs) are used because they are easily evaporable and non-combustible. since however, CFCs are known to contribute to the depletion of the ozone layer around the earth, becomes a general ban on manufacturing and use for this class of substances sought.

Die als Ersatzstoffe bisher eingesetzten Alkohole, wie z. B. Isopropanol (1), sind zwar nicht in diesem Maße ozonschädlich, haben aber vergleichsweise hohe Siedepunkte, sind in gasförmigem Zustand leichtentzündlich und erfordern daher einen hohen sicherheitstechnischen Aufwand.The alcohols previously used as substitutes, such as. B. isopropanol (1) Although not harmful to the extent of ozone, they are comparatively high Boiling points are highly flammable in the gaseous state and therefore require a high level of security.

Aufgabe der Erfindung ist es, die Vorteile der FCKW-haltigen und der alkoholischen Teflondispersion zu vereinigen, ohne daß deren jeweilige Nachteile in Kauf genommen werden müssen. Gelöst wird diese Aufgabe mit einem Verfahren mit den Merkmalen gemäß Patentanspruch. The object of the invention is to take advantage of CFC-containing and alcoholic Teflon dispersion to combine without their respective disadvantages in purchase must be taken. This task is solved with a procedure the features according to claim.  

Der Erfindung liegt die Beobachtung zugrunde, daß Perfluoralkane, wie z. B. Perfluorhexan C₆F₁₄, mit Alkoholen, wie z. B. Isopropanol, niedrigsiedende azeotrope Gemische bilden können. Dies ermöglicht es, das an sich höhersiedende Isopropanol (Sdp. 82°C) in einer konventionellen Dispersion (1) über eine azeotrope Destillation durch das niedrigersiedende Perfluorhexan (Sdp. 56°C) auszutauschen. Durch diesen kontinuierlichen Prozeß behält das dispergierte Teflon ständig seine technischen Eigenschaften; es findet keine irreversible Verklumpung unter Zerstörung der Dispersion statt. Die erfindungsgemäße Teflondispersion enthält schließlich als Lösemittel nur noch Perfluorhexan C₆F₁₄, das leicht verdampfbar, aber nicht brennbar ist und kein die Ozonschicht gefährdendes Potential hat.The invention is based on the observation that perfluoroalkanes, such as. B. Perfluorohexane C₆F₁₄, with alcohols, such as. B. isopropanol, low-boiling can form azeotropic mixtures. This enables the higher boiling point itself Isopropanol (bp 82 ° C) in a conventional dispersion (1) over an azeotropic Replace distillation with the lower boiling perfluorohexane (bp 56 ° C). Through this continuous process, the dispersed Teflon constantly keeps its technical characteristics; there is no irreversible clumping under Destruction of the dispersion instead. The teflon dispersion according to the invention contains finally only perfluorohexane C₆F₁₄ as solvent, which is easily evaporable, but is not flammable and has no potential that could endanger the ozone layer.

Ausführunqsbeispiel für das VerfahrenExecution example for the procedure

In einem 2 l-Dreihalskolben mit Rührer, Wasserabscheider und Rückflußkühler werden 0,8 kg 20%-ige Teflondispersion in Isopropanol (1) mit 1,4 kg Perfluorhexan (2) versetzt und gerührt. Das dreiphasige System wird auf dem Wasserbad erwärmt, worauf sich im Abscheider Isopropanol als obere Phase abzuscheiden beginnt. Nach ca. 4 h ist der Prozeß beendet und alles Isopropanol abgetrennt. Im Kolben verbleibt die Dispersion von Teflon in Perfluorhexan. Ausbeute ca. 1,5 kg. Durch weitere Verdünnung der Dispersion mit Perfluorhexan kann dann die für die jeweilige Anwendung optimale Konzentration hergestellt werden.In a 2 l three-necked flask with stirrer, water separator and reflux condenser 0.8 kg 20% teflon dispersion in isopropanol (1) with 1.4 kg Perfluorohexane (2) added and stirred. The three-phase system is based on the Water bath warmed up, whereupon isopropanol as the upper phase begins to separate. After about 4 hours the process is complete and all isopropanol severed. The dispersion of Teflon in perfluorohexane remains in the flask. Yield about 1.5 kg. By further diluting the dispersion with perfluorohexane can then produce the optimal concentration for the respective application become.

Anwendungsbeispiel für das ProduktApplication example for the product

Die hier beschriebene Teflondispersion in Perfluorhexan ist bereits im industriellen Einsatz beim Ziehen von feinen Stahlröhren für medizinische Zwecke, z. B. Infusionsnadeln, Spritzen zur Blutabnahme, etc. erfolgreich getestet worden.The teflon dispersion in perfluorohexane described here is already in industrial use Use when pulling fine steel tubes for medical purposes, e.g. B. Infusion needles, syringes for taking blood, etc. have been successfully tested.

  • (1) z. B. OSIXO I 20 NE. Warenzeichen(1) e.g. B. OSIXO I 20 NE. trademark
  • (2) z. B. PF5060, Warenzeichen.(2) e.g. B. PF5060, trademark.

Claims (1)

Verfahren zur Herstellung einer Teflondispersion für die Beschichtung von metallischen Oberflächen,
dadurch gekennzeichnet,
  • - daß ein FCKW-freies, leicht verdampfbares, aber nicht brennbares Lösemittel aus der Gruppe der Perfluoralkane für die Teflondispersion verwendet wird und,
  • - daß dieses Lösemittel durch eine azeotrope Destillation gegen den Alkohol in einer konventionellen Teflondispersion ausgetauscht wird.
Process for producing a teflon dispersion for the coating of metallic surfaces,
characterized,
  • - that a CFC-free, easily evaporable but non-flammable solvent from the group of perfluoroalkanes is used for the teflon dispersion, and
  • - That this solvent is replaced by an azeotropic distillation against the alcohol in a conventional teflon dispersion.
DE19944426072 1994-07-22 1994-07-22 Prodn. of teflon dispersion for coating a metal surface Expired - Fee Related DE4426072C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944426072 DE4426072C1 (en) 1994-07-22 1994-07-22 Prodn. of teflon dispersion for coating a metal surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944426072 DE4426072C1 (en) 1994-07-22 1994-07-22 Prodn. of teflon dispersion for coating a metal surface

Publications (1)

Publication Number Publication Date
DE4426072C1 true DE4426072C1 (en) 1995-07-13

Family

ID=6523932

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944426072 Expired - Fee Related DE4426072C1 (en) 1994-07-22 1994-07-22 Prodn. of teflon dispersion for coating a metal surface

Country Status (1)

Country Link
DE (1) DE4426072C1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914146A (en) * 1986-07-21 1990-04-03 Daikin Industries, Ltd. Polytetrafluoroethylene containing coating composition
US5198491A (en) * 1986-07-21 1993-03-30 Daikin Industries Ltd. Cooking utensils surface coated with tetrafluoroethlene base polymer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914146A (en) * 1986-07-21 1990-04-03 Daikin Industries, Ltd. Polytetrafluoroethylene containing coating composition
US5198491A (en) * 1986-07-21 1993-03-30 Daikin Industries Ltd. Cooking utensils surface coated with tetrafluoroethlene base polymer

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D1 Grant (no unexamined application published) patent law 81
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8339 Ceased/non-payment of the annual fee