GB1081046A - Manufacture of porous diaphragms - Google Patents

Manufacture of porous diaphragms

Info

Publication number
GB1081046A
GB1081046A GB37174/65A GB3717465A GB1081046A GB 1081046 A GB1081046 A GB 1081046A GB 37174/65 A GB37174/65 A GB 37174/65A GB 3717465 A GB3717465 A GB 3717465A GB 1081046 A GB1081046 A GB 1081046A
Authority
GB
United Kingdom
Prior art keywords
sheet
coagulum
additive
dispersion
polytetrafluoroethylene
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
Application number
GB37174/65A
Inventor
Stuart Frederick Mellish
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB37174/65A priority Critical patent/GB1081046A/en
Priority to JP5651566A priority patent/JPS4625267B1/ja
Priority to FR74838A priority patent/FR1491033A/en
Publication of GB1081046A publication Critical patent/GB1081046A/en
Expired 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions 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; Compositions of derivatives of such polymers
    • C08L27/02—Compositions 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; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions 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; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C25B13/08—Diaphragms; Spacing elements characterised by the material based on organic materials
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Electrochemistry (AREA)
  • Metallurgy (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

A porous diaphragm of P.T.F.E. suitable for use in electrolytic cells is obtained by mixing a solid particulate additive substantially uniformly into an aqueous dispersion of polytetrafluoroethylene, coagulating the dispersion, forming the coagulum into a sheet and removing the additive. Additives which suitably have a particle size in the range approximately 5-30 m include for example starch or calcium carbonate, which are removed by soaking the sheet in hydrochloric acid, or a plastic polymer which may be dissolved out by an organic solvent or hydrolysed or depolymerized and vaporized by heating. A particulate inorganic filler or particle diameter not greater than 1 m may also be added to the aqueous dispersion before coagulation and this is not removed from the diaphragm sheet. Suitable fillers include barium sulphate, titanium dioxide and the amphibole and serpentine forms of asbestos and these are used in the range 40 to 70% calculated on the weight of polytetrafluoroethylene. In a preferred process the dispersion may be coagulated by adding electrolyte or a water-miscible organic solvent, e.g. acetone, the coagulum separated from supernatant liquor by filtration, the coagulum dried (hot air oven at 110 DEG C.), mixed to a stiff paste with a high-boiling hydrocarbon, e.g. petroleum ether b.p. 100-120 DEG C., made into a sheet by passing through rolls, additive removed and any filler retained. Reference is made to British Specification 865,288.
GB37174/65A 1965-08-31 1965-08-31 Manufacture of porous diaphragms Expired GB1081046A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB37174/65A GB1081046A (en) 1965-08-31 1965-08-31 Manufacture of porous diaphragms
JP5651566A JPS4625267B1 (en) 1965-08-31 1966-08-29
FR74838A FR1491033A (en) 1965-08-31 1966-08-31 Process for manufacturing a porous diaphragm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB37174/65A GB1081046A (en) 1965-08-31 1965-08-31 Manufacture of porous diaphragms

Publications (1)

Publication Number Publication Date
GB1081046A true GB1081046A (en) 1967-08-31

Family

ID=10394375

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37174/65A Expired GB1081046A (en) 1965-08-31 1965-08-31 Manufacture of porous diaphragms

Country Status (3)

Country Link
JP (1) JPS4625267B1 (en)
FR (1) FR1491033A (en)
GB (1) GB1081046A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2139646A1 (en) * 1970-08-13 1972-02-17 Yussa Battery Co Ltd Partition and process for making same
DE2305509A1 (en) * 1972-02-04 1973-08-09 Ici Ltd METHOD OF MANUFACTURING A POROUS DIAPHRAGM
DE2523278A1 (en) * 1974-05-24 1975-12-04 Ici Ltd ELECTROCHEMICAL CELL
US3944477A (en) * 1974-10-15 1976-03-16 Basf Wyandotte Corporation Diaphragm for electrolytic cell for chlorine production
FR2375348A1 (en) * 1976-12-27 1978-07-21 Basf Wyandotte Corp DIAPHRAGMS FOR ALKALINE CHLORIDE ELECTROLYSIS CELLS
US4149951A (en) * 1978-05-22 1979-04-17 Eddleman William L Frame filter press and apparatus
US4201643A (en) 1974-06-07 1980-05-06 United Kingdom Atomic Energy Authority Analytical apparatus
DE2944251A1 (en) * 1978-11-03 1980-05-08 Hooker Chemicals Plastics Corp POLYMERIC MICROPOROESE ELECTROLYSIS CELL SEPARATOR
US4210515A (en) * 1975-02-10 1980-07-01 Basf Wyandotte Corporation Thermoplastic fibers as separator or diaphragm in electrochemical cells
US4224130A (en) * 1978-02-13 1980-09-23 The Dow Chemical Company Electrolytic diaphragm cell
US4250002A (en) * 1979-09-19 1981-02-10 Hooker Chemicals & Plastics Corp. Polymeric microporous separators for use in electrolytic processes and devices
US4256845A (en) * 1979-02-15 1981-03-17 Glasrock Products, Inc. Porous sheets and method of manufacture
US4263121A (en) * 1979-10-10 1981-04-21 The Dow Chemical Company Method to fabricate polymeric membranes and diaphragms
US4292146A (en) 1979-08-07 1981-09-29 Hooker Chemicals & Plastics Corp. Porous polyfluoroalkylene sheet useful for separating anolyte from catholyte in electrolytic cells
US4297196A (en) 1980-03-17 1981-10-27 Hooker Chemicals & Plastics Corp. Stable low voltage microporous diaphragm for electrolytic cells
EP0096991A1 (en) * 1982-06-09 1983-12-28 Imperial Chemical Industries Plc Porous diaphragm for electrolytic cell
US6103172A (en) * 1998-04-07 2000-08-15 Pall Corporation Method of preparaing a porous polytetrafluoroethylene membranne
US20110039091A1 (en) * 2008-04-30 2011-02-17 Nitto Denko Corporation Porous sheet and method for producing the same, and heat insulating sheet
US20110223427A1 (en) * 2008-11-12 2011-09-15 Nitto Denko Corporation Method of producing electrically insulating thermally conductive sheet, electrically insulating thermally conductive sheet, and heat dissipating member

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2229739B1 (en) * 1973-05-18 1976-09-17 Rhone Progil
US4098672A (en) * 1973-07-18 1978-07-04 Imperial Chemical Industries Limited Porous diaphragms
FR2280435A1 (en) * 1974-08-02 1976-02-27 Rhone Poulenc Ind PROCESS FOR OBTAINING A MICROPOREOUS MEMBRANE AND NEW PRODUCT THUS OBTAINED
ZA785994B (en) * 1977-11-15 1980-04-30 Ici Ltd Production of porous diaphragms
US4289600A (en) 1978-03-31 1981-09-15 Hooker Chemicals & Plastics Corp. Microporous membrane materials
IN152082B (en) * 1978-11-03 1983-10-15 Hooker Chemicals Plastics Corp

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2139646A1 (en) * 1970-08-13 1972-02-17 Yussa Battery Co Ltd Partition and process for making same
DE2305509A1 (en) * 1972-02-04 1973-08-09 Ici Ltd METHOD OF MANUFACTURING A POROUS DIAPHRAGM
DE2523278A1 (en) * 1974-05-24 1975-12-04 Ici Ltd ELECTROCHEMICAL CELL
US4089758A (en) * 1974-05-24 1978-05-16 Imperial Chemical Industries Limited Electrolytic process
US4201643A (en) 1974-06-07 1980-05-06 United Kingdom Atomic Energy Authority Analytical apparatus
US3944477A (en) * 1974-10-15 1976-03-16 Basf Wyandotte Corporation Diaphragm for electrolytic cell for chlorine production
US4210515A (en) * 1975-02-10 1980-07-01 Basf Wyandotte Corporation Thermoplastic fibers as separator or diaphragm in electrochemical cells
FR2375348A1 (en) * 1976-12-27 1978-07-21 Basf Wyandotte Corp DIAPHRAGMS FOR ALKALINE CHLORIDE ELECTROLYSIS CELLS
US4224130A (en) * 1978-02-13 1980-09-23 The Dow Chemical Company Electrolytic diaphragm cell
US4149951A (en) * 1978-05-22 1979-04-17 Eddleman William L Frame filter press and apparatus
DE2944251A1 (en) * 1978-11-03 1980-05-08 Hooker Chemicals Plastics Corp POLYMERIC MICROPOROESE ELECTROLYSIS CELL SEPARATOR
US4256845A (en) * 1979-02-15 1981-03-17 Glasrock Products, Inc. Porous sheets and method of manufacture
US4292146A (en) 1979-08-07 1981-09-29 Hooker Chemicals & Plastics Corp. Porous polyfluoroalkylene sheet useful for separating anolyte from catholyte in electrolytic cells
US4250002A (en) * 1979-09-19 1981-02-10 Hooker Chemicals & Plastics Corp. Polymeric microporous separators for use in electrolytic processes and devices
US4263121A (en) * 1979-10-10 1981-04-21 The Dow Chemical Company Method to fabricate polymeric membranes and diaphragms
US4297196A (en) 1980-03-17 1981-10-27 Hooker Chemicals & Plastics Corp. Stable low voltage microporous diaphragm for electrolytic cells
EP0096991A1 (en) * 1982-06-09 1983-12-28 Imperial Chemical Industries Plc Porous diaphragm for electrolytic cell
US4713163A (en) * 1982-06-09 1987-12-15 Imperial Chemical Industries Plc Porous diaphragm for electrolytic cell
US6103172A (en) * 1998-04-07 2000-08-15 Pall Corporation Method of preparaing a porous polytetrafluoroethylene membranne
US6274043B1 (en) 1998-04-07 2001-08-14 Pall Corporation Porous polytetrafluoroethylene membrane
US20110039091A1 (en) * 2008-04-30 2011-02-17 Nitto Denko Corporation Porous sheet and method for producing the same, and heat insulating sheet
US9017817B2 (en) * 2008-04-30 2015-04-28 Nitto Denko Corporation Method for producing laminated porous sheet comprising polytetrafluoroethylene and carbon particles
US20110223427A1 (en) * 2008-11-12 2011-09-15 Nitto Denko Corporation Method of producing electrically insulating thermally conductive sheet, electrically insulating thermally conductive sheet, and heat dissipating member

Also Published As

Publication number Publication date
JPS4625267B1 (en) 1971-07-21
FR1491033A (en) 1967-08-04

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