WO2022244774A1 - フッ素樹脂からの金属異物の除去方法及び金属異物が低減されたフッ素樹脂の製造方法 - Google Patents

フッ素樹脂からの金属異物の除去方法及び金属異物が低減されたフッ素樹脂の製造方法 Download PDF

Info

Publication number
WO2022244774A1
WO2022244774A1 PCT/JP2022/020540 JP2022020540W WO2022244774A1 WO 2022244774 A1 WO2022244774 A1 WO 2022244774A1 JP 2022020540 W JP2022020540 W JP 2022020540W WO 2022244774 A1 WO2022244774 A1 WO 2022244774A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluororesin
foreign matter
fluorine resin
screen
metal
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.)
Ceased
Application number
PCT/JP2022/020540
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
政佳 宮本
博幸 栴檀
幸一 廣田
信 川守田
恒彦 不破
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.)
Daikin Fluorochemicals China Co Ltd
Daikin Industries Ltd
Original Assignee
Daikin Fluorochemicals China Co Ltd
Daikin 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 Daikin Fluorochemicals China Co Ltd, Daikin Industries Ltd filed Critical Daikin Fluorochemicals China Co Ltd
Priority to JP2023522676A priority Critical patent/JP7603157B2/ja
Priority to EP22804685.0A priority patent/EP4342916A4/en
Priority to CN202280033892.8A priority patent/CN117295773A/zh
Publication of WO2022244774A1 publication Critical patent/WO2022244774A1/ja
Priority to US18/507,699 priority patent/US12420290B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/32—Magnetic separation acting on the medium containing the substance being separated, e.g. magneto-gravimetric-, magnetohydrostatic-, or magnetohydrodynamic separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0335—Component parts; Auxiliary operations characterised by the magnetic circuit using coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/26—Magnetic separation acting directly on the substance being separated with free falling material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F6/00—Post-polymerisation treatments
    • C08F6/02—Neutralisation of the polymerisation mass, e.g. killing the catalyst also removal of catalyst residues
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F6/00—Post-polymerisation treatments
    • C08F6/26—Treatment of polymers prepared in bulk also solid polymers or polymer melts
    • C08F6/28—Purification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/20—Magnetic separation of bulk or dry particles in mixtures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/22—Details of magnetic or electrostatic separation characterised by the magnetic field, e.g. its shape or generation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/28—Parts being designed to be removed for cleaning purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0224—Screens, sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0268—Separation of metals
    • B29B2017/0272—Magnetic separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/16—PVDF, i.e. polyvinylidene fluoride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluoroethylene, e.g. ePTFE, i.e. expanded polytetrafluoroethylene
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present disclosure relates to a method for removing metallic foreign matter from fluororesin and a method for producing fluororesin with reduced metallic foreign matter.
  • Fluoropolymers are used in a wide variety of applications. Metallic foreign matter may be mixed in due to rubbing or corrosion of manufacturing equipment. Therefore, the removal of metallic foreign matter from fluororesin containing metallic foreign matter is an important issue.
  • Patent Literatures 1 and 2 disclose the use of magnets to remove trace amounts of metallic foreign matter in resin.
  • Patent Document 3 discloses separating and collecting a fluorine-containing resin powder using a liquid medium consisting of an alkane hydrochloride and an aqueous liquid medium.
  • Patent Literature 4 discloses that a solvent is used to remove foreign matter in a fluororesin.
  • JP 2005-263985 A JP-A-2005-21761 JP-A-54-071155 WO 2004/009653
  • An object of the present disclosure is to provide a method for suitably removing metallic foreign matter in fluororesin and a method for producing fluororesin with reduced metallic foreign matter, which includes a method for removing metallic foreign matter in the fluororesin as one step.
  • This disclosure is A method for removing metal foreign matter from a fluororesin, characterized in that the metal is removed by applying a magnetic field with a magnet while dropping the fluororesin by gravity. It is preferable that the above method for removing metal foreign matter includes a screen made of a magnetic material in the flow path through which the fluororesin drops by gravity.
  • the magnets are preferably electromagnets.
  • the fluororesin is preferably powder, pellets or granules. In the method for removing metal foreign matter from the fluororesin, it is preferable not to vibrate the screen when the fluororesin is passed through the screen.
  • the present disclosure also provides a method for producing a fluororesin with reduced metal foreign matter, characterized by having a step of removing metal by applying a magnetic field with an electromagnet while allowing the fluororesin to drop by gravity.
  • a screen made of a magnetic material is provided in the flow path through which the fluororesin drops by gravity.
  • the magnets are preferably electromagnets.
  • the fluororesin is preferably powder, pellets or granules. In the method for producing a fluororesin, it is preferable not to vibrate the screen when the fluororesin is passed through the screen.
  • the method for removing metallic foreign matter in the fluororesin of the present disclosure can efficiently remove metallic foreign matter at low cost and with high precision. As a result, it is possible to reduce the amount of resin to be lot-out when checking for metallic foreign matter, and to efficiently provide fluororesin with little metallic foreign matter.
  • the present disclosure is a method for removing metals in fluororesin.
  • the fluororesin used here is not particularly limited. Specific examples include PTFE resin, PFA resin, FEP resin, ETFE resin, PCTFE resin, PVDF resin, and the like. Among these, PTFE resin is particularly preferred.
  • the fluororesin is preferably solid, and can be applied to powders, granules, pellets, and other forms of any shape.
  • the metal may exist alone in the form of metal powder or the like, or it may be a combination of the metal and the fluororesin.
  • the foreign matter is removed by magnetic force, even if the metal and fluororesin, which are more difficult to remove, are integrated, they can be preferably removed.
  • metals mixed as foreign substances include stainless steel, iron, and metals in which other elements are mixed with these.
  • the metal in the fluororesin is mainly due to the contamination of metal foreign matter due to rubbing or corrosion of manufacturing equipment, and the occurrence rate is not high. However, if this occurs, it will cause defective products in various applications, so it is preferable to be able to remove it with as high precision as possible.
  • the present disclosure is characterized in that the metal is removed by applying a magnetic field with a magnet while allowing the fluororesin to drop by gravity.
  • the surrounding fluororesin interferes with the magnetic force, and the metal foreign matter may not be sufficiently removed.
  • metal foreign matter placed on the fluororesin may not be sufficiently removed by the magnetic force. Since the fluorine resin is also removed to some extent along with the foreign matter, there is also the problem that a constant rate of loss always occurs during operation.
  • the magnets used in this disclosure may be electromagnets or permanent magnets.
  • the use of an electromagnet is more preferable in that a stronger magnetic field can be applied.
  • By turning off the power supply it is also preferable in that metal foreign matter can be easily removed during cleaning.
  • Permanent magnets can be used in the same way, but the use of electromagnets is more preferable from the standpoint of foreign matter removal efficiency, such as low magnetic force, large space between magnets that can be installed, and difficulty in removing foreign matter that has adhered during cleaning.
  • the magnetic force applied to the fluororesin is preferably 0.8 tesla or more, more preferably 1.2 tesla or more.
  • treatment in such a high magnetic force region is preferable in that fine metal can be removed.
  • a screen made of a magnetic material may be set in the space where the fluororesin falls.
  • the screen becomes magnetic due to the electromagnet, which plays a role in removing metal foreign matter. It is also preferable to stop the electromagnet during cleaning so that metal foreign matter adhering to the screen can be easily removed.
  • the screen may be made of permanent magnets. Since such a screen has magnetism due to permanent magnets, a similar effect can be obtained.
  • the shape of the screen is not particularly limited, and examples thereof include a 5 mm screen, honeycomb, and micropitch.
  • metal foreign matter removing method will be described in more detail with reference to FIG. 1 below.
  • several metal screens may be placed on the path along which the fluororesin falls due to gravity.
  • FIG. 1 shows the state in which the screen is set in the electromagnetic separator.
  • One or more screens 1 made of a magnetic material are vertically multi-layered by holding rods 3 in the hollow part of a cylinder 2 whose upper and lower ends are open. is held to
  • the tube 2 may be arranged at the center of the electromagnet 4 and the vibrator 5 may be attached to the bottom of the tube 2 . Note that the vibrator 5 is an optional requirement and may not be provided.
  • the vibrator 5 when powdery fluororesin is used, it is preferable not to use the vibrator 5 . If a vibrator is used, the fluororesin may get into the gaps to form flakes or agglomerates of the resin, or rubbing due to vibration may generate new metal pieces, so it is preferable not to use a vibrator.
  • a product outlet and a magnetic foreign matter outlet may be connected to the bottom of the cylinder.
  • the product outlet and the magnetic foreign matter outlet can be switched by rotating a damper with a cylinder.
  • the fluororesin containing the magnetic foreign matter supplied from the top of the tube 2 into the inside is dropped in the direction indicated by the arrow in FIG. It is magnetically attached to the screen magnetized by the magnet 4 .
  • the product from which the magnetic foreign matter has been removed is discharged from the bottom of the cylinder 2 after passing through the screen.
  • the magnet is an electromagnet
  • the electromagnet can be turned off to demagnetize the screen to remove magnetic foreign matter adhering to the screen.
  • the screen 1 can be taken out with a holding bar and cleaned to remove magnetic foreign matter. The cleaned screen can be reinserted into the cylinder.
  • FIG. 2 shows an apparatus for removing magnetic foreign matter by bringing a drop-shaped magnet into contact with fluororesin containing magnetic foreign matter.
  • the drop-shaped magnet 11 has a semi-arc portion in the lower portion and a triangular portion in the upper portion. The foreign matter is removed by the magnet while falling along the slope of the triangular portion.
  • a plurality of the drop-shaped magnets be arranged via a yoke.
  • the apparatus of FIG. 2 can also remove magnetic foreign matter.
  • the present disclosure is a method for removing metallic foreign matter from a fluororesin as described above, and also a method for producing a fluororesin with reduced metallic foreign matter, which includes a step of removing such metallic foreign matter.
  • a fluororesin in which metallic foreign matter is reduced there are various approaches to try to obtain "a fluororesin in which metallic foreign matter is reduced”.
  • the present disclosure also provides a novel technique for obtaining "a fluororesin with reduced metallic foreign matter”.
  • a method for producing a fluororesin with reduced metallic foreign matter according to the present disclosure includes a step of removing metallic foreign matter from the fluororesin by the method described above.
  • the “step of removing metallic foreign matter” here can be as described above.
  • the method for producing a fluororesin with reduced metallic foreign matter according to the present disclosure may further include a step for removing metallic foreign matter other than the steps described above.
  • the method for removing metallic foreign matter of the present disclosure has a slow processing speed. That is, if a large amount of fluororesin is treated in a short period of time, it becomes difficult to sufficiently remove metallic foreign matter, which is not preferable.
  • Examples 1-3 A sample was prepared by adding 500 ppm of stainless steel 316L powder (SUS316L powder, 150 ⁇ mpass, manufactured by Kojundo Chemical Co., Ltd.) to PTFE granulated powder (Polyflon PTFE M-392 manufactured by Daikin Industries, Ltd.). 5 kg of PTFE granulated powder containing stainless steel powder was prepared and used for each test.
  • the apparatus used is an electromagnetic separator (CG-180X-1 type) manufactured by Nippon Magnetics Co., Ltd. An electromagnet was used as the magnet.
  • the screen is made of a magnetic material.
  • a bar magnet of 15000 G is wrapped with a medicine wrapping paper without gaps and fixed with tape. Such bar magnets are fixed by clamps.
  • a powder to be measured is passed over the bar magnet.
  • the treatment speed is set at 4 kg/hour.
  • pouring the powder pour the recovered powder over the bar magnet again.
  • Such work causes the metal in the powder to adhere to the magnet.
  • a bar magnet is placed on a heat-resistant metal container, the tape fixing the medicine wrapping paper is removed, and the medicine wrapping paper is removed from the bar magnet.
  • the metal adhering to the metal falls into the heat-resistant metal container.
  • Such a heat-resistant metal container is placed in an electric furnace at 600° C. and taken out after 2 hours.
  • Table 1 shows a value calculated as a ratio of the amount of metal thus measured to the amount of stainless steel powder added to the sample as a residual stainless steel ratio.
  • Polymerization was initiated by adding 0.028 kg of a 50% methanol solution of di-n-propylperoxydicarbonate [NPP] as a polymerization initiator. Since the pressure decreased as the polymerization progressed, TFE and PPVE were continuously added at a ratio that gave the desired polymer composition.
  • NPP di-n-propylperoxydicarbonate
  • Examples 4 and 5 A sample was prepared by adding 500 ppm of stainless steel 316L powder (manufactured by Kojundo Chemical Co., Ltd., SUS316L powder, 150 ⁇ m pass) to the PFA powder obtained by the above method. 1 kg of PFA powder containing stainless steel powder was prepared and used for each test.
  • the device used is a grating magnet with a housing manufactured by Magnetec Japan Co., Ltd. (neodymium-based rare earth magnet; the magnet is a permanent magnet).
  • the removal method of the present disclosure can suitably remove metallic foreign matter from the fluororesin.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
PCT/JP2022/020540 2021-05-20 2022-05-17 フッ素樹脂からの金属異物の除去方法及び金属異物が低減されたフッ素樹脂の製造方法 Ceased WO2022244774A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2023522676A JP7603157B2 (ja) 2021-05-20 2022-05-17 フッ素樹脂からの金属異物の除去方法及び金属異物が低減されたフッ素樹脂の製造方法
EP22804685.0A EP4342916A4 (en) 2021-05-20 2022-05-17 METHOD FOR REMOVING FOREIGN METAL BODY FROM FLUORINATED RESIN AND METHOD FOR PRODUCING FLUORINATED RESIN WITH LOW FOREIGN METAL BODY CONTENT
CN202280033892.8A CN117295773A (zh) 2021-05-20 2022-05-17 从氟树脂除去金属异物的方法和减少了金属异物的氟树脂的制造方法
US18/507,699 US12420290B2 (en) 2021-05-20 2023-11-13 Method for removing metallic foreign matter from fluororesin and method for producing fluororesin with reduced metallic foreign matter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110549939.3 2021-05-20
CN202110549939.3A CN115366293A (zh) 2021-05-20 2021-05-20 从氟树脂中去除金属异物的方法和减少了金属异物的氟树脂的制造方法

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/507,699 Continuation US12420290B2 (en) 2021-05-20 2023-11-13 Method for removing metallic foreign matter from fluororesin and method for producing fluororesin with reduced metallic foreign matter

Publications (1)

Publication Number Publication Date
WO2022244774A1 true WO2022244774A1 (ja) 2022-11-24

Family

ID=84058672

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/020540 Ceased WO2022244774A1 (ja) 2021-05-20 2022-05-17 フッ素樹脂からの金属異物の除去方法及び金属異物が低減されたフッ素樹脂の製造方法

Country Status (6)

Country Link
US (1) US12420290B2 (https=)
EP (1) EP4342916A4 (https=)
JP (1) JP7603157B2 (https=)
CN (2) CN115366293A (https=)
TW (1) TW202307103A (https=)
WO (1) WO2022244774A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117358415A (zh) * 2023-11-03 2024-01-09 宜章弘源化工有限责任公司 铁矿石筛分用磁选装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5471155A (en) 1977-11-18 1979-06-07 Mitsui Fluorochemicals Co Ltd Method for removing tramp material from fluorineecontaining resin powder
JPH0474546A (ja) * 1990-07-17 1992-03-09 Mitsubishi Gas Chem Co Inc 永久磁石式ロールセパレータ
JP2003137922A (ja) * 2001-07-06 2003-05-14 Nippon Shokubai Co Ltd 吸水性樹脂粉末、その製造方法およびその用途
JP2005021761A (ja) 2003-06-30 2005-01-27 Sumitomo Bakelite Co Ltd 不純物の除去装置
JP2005066952A (ja) * 2003-08-21 2005-03-17 Daicel Chem Ind Ltd プラスチック混合物の分別処理システム
JP2005263985A (ja) 2004-03-18 2005-09-29 Air Water Chemical Inc 熱硬化性樹脂の異物除去方法及び装置
JP2013043911A (ja) * 2011-08-23 2013-03-04 Asahi Kasei Chemicals Corp ポリアセタールの製造方法
JP2017035670A (ja) * 2015-08-12 2017-02-16 宇部興産株式会社 選別装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062545A (en) * 1933-01-14 1936-12-01 Feldspathic Res Corp Apparatus for magnetic separation
US4778594A (en) * 1986-07-24 1988-10-18 The University Of Chicago (Arch Development Corp.) Apparatus for magnetic separation of paramagnetic and diamagnetic material
US5333797A (en) * 1992-04-03 1994-08-02 Becker John C Commingled recyclables recovery and recycling process and related apparatuses
US6716894B2 (en) 2001-07-06 2004-04-06 Nippon Shokubai Co., Ltd. Water-absorbent resin powder and its production process and uses
KR20050030203A (ko) 2002-07-24 2005-03-29 아사히 가라스 가부시키가이샤 연속식 수지 회수 장치 및 회수 방법
JP2012511602A (ja) * 2008-12-12 2012-05-24 ビーエーエスエフ ソシエタス・ヨーロピア 金属不純物を分離する方法
JP5218294B2 (ja) * 2009-06-24 2013-06-26 住友ベークライト株式会社 磁性金属異物の捕捉装置、捕捉システムおよび捕捉方法
WO2011078334A1 (ja) * 2009-12-24 2011-06-30 出光興産株式会社 廃棄光ディスク及び／又は回収光ディスクからのポリカーボネート樹脂の回収方法、並びに難燃性ポリカーボネート樹脂組成物、射出成形体及び光学成形品
JP2016176802A (ja) * 2015-03-19 2016-10-06 株式会社クレハ 金属異物の回収方法および重合体の金属異物検査方法
JP2022059133A (ja) 2020-10-01 2022-04-13 株式会社三洋物産 遊技機

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5471155A (en) 1977-11-18 1979-06-07 Mitsui Fluorochemicals Co Ltd Method for removing tramp material from fluorineecontaining resin powder
JPH0474546A (ja) * 1990-07-17 1992-03-09 Mitsubishi Gas Chem Co Inc 永久磁石式ロールセパレータ
JP2003137922A (ja) * 2001-07-06 2003-05-14 Nippon Shokubai Co Ltd 吸水性樹脂粉末、その製造方法およびその用途
JP2005021761A (ja) 2003-06-30 2005-01-27 Sumitomo Bakelite Co Ltd 不純物の除去装置
JP2005066952A (ja) * 2003-08-21 2005-03-17 Daicel Chem Ind Ltd プラスチック混合物の分別処理システム
JP2005263985A (ja) 2004-03-18 2005-09-29 Air Water Chemical Inc 熱硬化性樹脂の異物除去方法及び装置
JP2013043911A (ja) * 2011-08-23 2013-03-04 Asahi Kasei Chemicals Corp ポリアセタールの製造方法
JP2017035670A (ja) * 2015-08-12 2017-02-16 宇部興産株式会社 選別装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4342916A1

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117358415A (zh) * 2023-11-03 2024-01-09 宜章弘源化工有限责任公司 铁矿石筛分用磁选装置

Also Published As

Publication number Publication date
JP7603157B2 (ja) 2024-12-19
US12420290B2 (en) 2025-09-23
TW202307103A (zh) 2023-02-16
EP4342916A1 (en) 2024-03-27
CN115366293A (zh) 2022-11-22
EP4342916A4 (en) 2024-11-20
JPWO2022244774A1 (https=) 2022-11-24
CN117295773A (zh) 2023-12-26
US20240075481A1 (en) 2024-03-07

Similar Documents

Publication Publication Date Title
CN1079807C (zh) 改性聚四氟乙烯粒状粉末的制法
Ditsch et al. High-gradient magnetic separation of magnetic nanoclusters
Yu et al. Enhanced fluidization of nanoparticles in an oscillating magnetic field
WO2022244774A1 (ja) フッ素樹脂からの金属異物の除去方法及び金属異物が低減されたフッ素樹脂の製造方法
JPWO2018181046A1 (ja) アトマイズ粉の製造方法及び磁心の製造方法
CN103370137A (zh) 磁选装置
JPWO2013027818A1 (ja) 混合物の分離方法及び分離装置
CN118874270A (zh) 一种耐火材料加工用配料混合设备
CN116441045B (zh) 一种用于冶金工艺中的铁粉立式提纯机
JP5280626B2 (ja) 非磁性金属酸化物粉末における着磁性粒子の個数測定方法
JP5243803B2 (ja) 磁場および磁場傾斜改善ろ過用装置
CN117282540A (zh) 一种气固/液固中磁性颗粒的分离装置及方法
JP2006341212A (ja) 磁性異物類除去清掃装置
CN1403493A (zh) 不含有填料的聚四氟乙烯粒状粉末
JP2014000543A (ja) 金属粉粒含有廃液の処理方法
JP2010042347A (ja) 磁性金属異物の除去方法及び磁性金属異物の除去装置
CN1533310A (zh) 去除化学反应器上的沉积物的方法
WO2002020125A1 (en) Magnetic filter device
US20090077826A1 (en) Systems And Methods For Reducing Electrostatic Charge In A Fluidized Bed
Bucak et al. Cell clarification and size separation using continuous countercurrent magnetophoresis
JP4953042B2 (ja) 磁性体異物除去装置
Wada et al. The development of the separation apparatus of phosphor by controlling the magnetic force
JP2024125696A (ja) 磁性物除去装置
JP7542433B2 (ja) 石英ガラス原料粉の磁性体粉除去装置、及びこの磁性体粉除去装置を用いた磁性体粉除去方法
JP4301369B2 (ja) 磁石体及びその磁石体を用いた箱又は磁選機

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22804685

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023522676

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 202280033892.8

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2022804685

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2022804685

Country of ref document: EP

Effective date: 20231220