WO1986000326A1 - Polytetrafluoroethylene composite material - Google Patents

Polytetrafluoroethylene composite material Download PDF

Info

Publication number
WO1986000326A1
WO1986000326A1 PCT/US1985/000727 US8500727W WO8600326A1 WO 1986000326 A1 WO1986000326 A1 WO 1986000326A1 US 8500727 W US8500727 W US 8500727W WO 8600326 A1 WO8600326 A1 WO 8600326A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass
lead
composition
ptfe
particles
Prior art date
Application number
PCT/US1985/000727
Other languages
English (en)
French (fr)
Inventor
Paul R. Doose
Original Assignee
Hughes Aircraft Company
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 Hughes Aircraft Company filed Critical Hughes Aircraft Company
Priority to DE8585902732T priority Critical patent/DE3577718D1/de
Publication of WO1986000326A1 publication Critical patent/WO1986000326A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K3/1006—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by the chemical nature of one of its constituents
    • C09K3/1009—Fluorinated polymers, e.g. PTFE
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/40—Glass
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/02—Inorganic compounds
    • C09K2200/0243—Silica-rich compounds, e.g. silicates, cement, glass
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/02—Inorganic compounds
    • C09K2200/0243—Silica-rich compounds, e.g. silicates, cement, glass
    • C09K2200/0252—Clays
    • 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
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/935—Seal made of a particular material
    • Y10S277/936—Composite
    • Y10S277/937—Glass particles or filament
    • 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
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/935—Seal made of a particular material
    • Y10S277/944—Elastomer or plastic
    • Y10S277/945—Containing fluorine
    • Y10S277/946—PTFE

Definitions

  • soft glasses such as lead and/or soda-lead glass particles are incorporated into PTFE powder in amounts ranging from 13.2 to 74.3 weight percent for lead glass and 6.4 to 56.5 weight percent soda-lead glass. This corresponds to 5 to 50 volume percent lead glass and soda-lead glass, respectively in the final sintered PTFE.
  • the fabrication of various articles from the PTFE powder/soft glass solids blend is carried out by conventional PTFE processing involving cold compression followed by sinter ⁇ ing at elevated temperature.
  • the sintering temperature in accordance with another aspect of the invention is maintained at or above the annealing point of the glass particles in the case of lead glasses.
  • PTFE filled with lead or soda-lead glass is sintered at tem ⁇ peratures above the melting point of lead in an oxygen free atmosphere wherein at least a portion of the lead oxide present in lead glass is reduced to metallic lead.
  • Such treatment allows generation of metallic lead during the sintering step which can be allowed to migrate within the PTFE to form localized areas rich in lead or gradients of varying metallic lead concentrations within the PTFE at various locations.
  • the polytetrafluoroethylene (PTFE) composite compounds in accordance with the present invention have a wide variety of uses.
  • the compounds of the invention may be fabricated into bushings, rider rings, and seals for use in compressors, hydraulic equipment and auto ⁇ mobiles. Further, the compounds may be used to form bearing pads for bridges, pipe lines and high-rise buildings.
  • PTFE any of the commercially available brands of PTFE may be used to make th PTFE composite.
  • PTFE available from E. I. Dupont Co. and sold as TEFLON may be used.
  • PTFE sold as HALON by Allied Corp., FLUON by ICI Americas, Inc. and HOSTAFLON by American Hoechst may be used.
  • the PTFE is preferably purchased as a powder having average particle sizes ranging from approximately 0.2 microns to 5 microns and even larger.
  • the amount of glass filler particles incorporated into the PTFE powder is sufficient to provide sintered PTFE which contains between 5 volume percent and 50 volume percent glass particles.
  • the amount of lead glass filler particles will range from 20 to 50 weight percent while the amounts of soda-lead glass preferably range from 10 to 30 weight percent.
  • the above weight percent ranges for the lead and soda-lead glasses are different due to differences in the densities of the glass.
  • the given weight percentage ranges are designed to provide roughly equivalent preferred volume percent ranges for the two types of glasses.
  • soft glass filled PTFE were prepared using TEFLON TFE 7A powder and Corning No. 8463 high lead glass particles and Corning No. 0010 soda-lead glass particles. The glass particles were fractured and crushed sufficiently to pass through a 325 mesh screen (U.S. standard size). The TEFLON powder and glass particles were mixed to provide the following solids blends: (1) 25 weight percent high lead glass in PTFE
  • the 710°F sintering temperature used in the fabrication of the soft glass loaded PTFE exemplary rods is, as previously mentioned, above both the 685°F annealing point of the high lead glass and the 621°F melting point of lead. Some lead melted out of the high lead glass filler particj.es. The melted lead formed in the center of the rods and on cooling a dark colored center core was formed by lead solidifying in the interstices of the central portion of the rod. As previously mentioned, this phenomena can be controlled by regulating the oxygen content of the sintering oven atmosphere and/or reducing sintering temperature.
  • the soft glass filled PTFE in accordance with the present invention provides an improved compound which is structurally stronger than conventional PTFE composite materials made from PTFE filled withe E-Glass and further provides significant reductions in wear debris generated when the PTFE filled with soft glass is used in place of E-Glass/PTFE composite.
  • Seals and rider rings were made from both the PTFE filled with 25 weight percent high glass and PTFE filled with 15 weight percent chopped E-Glass fibers.
  • the E-Glass fibers were .0005 inch in diameter and .005 inch long. These seals and rider rings were assembled in cryo-cooler compressor units and their performance observed.
  • the performance of the PTFE filled with soft glass was equal to or surpassed the performance of the PTFE seals and rings filled with E-Glass.
  • the amount of wear debris generated by the PTFE seals and rings filled with soft glass was significantly less than that generated by the PTFE filled with E-Glass.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Sealing Devices (AREA)
  • Glass Compositions (AREA)
PCT/US1985/000727 1984-06-21 1985-04-22 Polytetrafluoroethylene composite material WO1986000326A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8585902732T DE3577718D1 (de) 1984-06-21 1985-04-22 Polytetrafluorethylenzusammensetzung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US622,895 1984-06-21
US06/622,895 US4580790A (en) 1984-06-21 1984-06-21 Sintered polytetrafluoroethylene composite material and seal assembly

Publications (1)

Publication Number Publication Date
WO1986000326A1 true WO1986000326A1 (en) 1986-01-16

Family

ID=24495939

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1985/000727 WO1986000326A1 (en) 1984-06-21 1985-04-22 Polytetrafluoroethylene composite material

Country Status (7)

Country Link
US (1) US4580790A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0185044B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS61502469A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3577718D1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IL (1) IL75168A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NO (1) NO860183L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
WO (1) WO1986000326A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456471A3 (en) * 1990-05-09 1992-07-22 Oiles Corporation A fluororesin composition suitable for use in a sliding member and a sliding member

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456471A3 (en) * 1990-05-09 1992-07-22 Oiles Corporation A fluororesin composition suitable for use in a sliding member and a sliding member
US5300366A (en) * 1990-05-09 1994-04-05 Oiles Corporation Fluororesin composition for a sliding member and a sliding member

Also Published As

Publication number Publication date
EP0185044B1 (en) 1990-05-16
US4580790A (en) 1986-04-08
IL75168A0 (en) 1985-09-29
IL75168A (en) 1989-06-30
NO860183L (no) 1986-01-20
EP0185044A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1986-06-25
JPS61502469A (ja) 1986-10-30
DE3577718D1 (de) 1990-06-21

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