WO2003028911A1 - Procedes de production de granules de resine remplis d'une charge avec une densite elevee, et produit moule constitue par ces granules - Google Patents

Procedes de production de granules de resine remplis d'une charge avec une densite elevee, et produit moule constitue par ces granules Download PDF

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Publication number
WO2003028911A1
WO2003028911A1 PCT/JP2002/009803 JP0209803W WO03028911A1 WO 2003028911 A1 WO2003028911 A1 WO 2003028911A1 JP 0209803 W JP0209803 W JP 0209803W WO 03028911 A1 WO03028911 A1 WO 03028911A1
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WO
WIPO (PCT)
Prior art keywords
filler
highly
filled
highly filled
producing
Prior art date
Application number
PCT/JP2002/009803
Other languages
English (en)
Japanese (ja)
Inventor
Katsuya Yamada
Takuma Yoshisaka
Kazuaki Ikeda
Original Assignee
Sumitomo Electric Fine Polymer, Inc.
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
Priority claimed from JP2001295203A external-priority patent/JP2003096200A/ja
Priority claimed from JP2001295202A external-priority patent/JP2003094507A/ja
Priority claimed from JP2001305924A external-priority patent/JP2003103618A/ja
Priority claimed from JP2001305925A external-priority patent/JP2003103530A/ja
Application filed by Sumitomo Electric Fine Polymer, Inc. filed Critical Sumitomo Electric Fine Polymer, Inc.
Publication of WO2003028911A1 publication Critical patent/WO2003028911A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
    • 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
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • 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
    • B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material

Definitions

  • the present invention relates to a method for producing a high-filled fat powder granule and a molded product using the same.
  • the present invention relates to a method for producing a resin particle in which a polymer is highly filled with a filler, and a method for producing a molded article using the particle.
  • a material that suppresses the emission, reflection, and scattering of unnecessary electromagnetic waves from these sources that is, a material that has electromagnetic wave absorption characteristics.
  • materials having such electromagnetic wave absorption characteristics include a metal plate having a high magnetic permeability, a paint in which a magnetic powder is dispersed in an organic binder, a composition in which a magnetic powder is added to a polymer such as plastic or rubber, and the like. It has been known.
  • a high-permeability metal plate absorbs electromagnetic waves while reflecting electromagnetic waves, and thus has a problem in that it reverberates in the device and the electromagnetic waves are amplified.
  • a magnetic powder is dispersed in an organic binder to form a coating, it is necessary to apply the coating to a separately formed film / molded product, and the shape itself cannot be maintained.
  • the method of adding the magnetic powder into the polymer is convenient because of the flexibility in molding, but if the amount of the magnetic powder is increased to the extent that the electromagnetic wave absorption characteristics are sufficiently exhibited, it becomes difficult to mold, or the molding may become difficult.
  • the problem is that the mechanical strength of the body is weak, brittle, and unfit for practical use.
  • pelletization can be achieved by extruding with a feeder-ruder or the like. These pellets can be put into molding processes such as extrusion molding machines and injection molding.
  • the resin viscosity becomes extremely high due to a large amount of filler, and it is very difficult to extrude and pelletize it with a filler or the like. Disclosure of the invention
  • An object of the present invention is to provide a means for efficiently filling an organic polymer with a filler in order to obtain a filler-filled resin powder which can be formed into a free shape by itself.
  • an organic polymer and additives other than fillers such as an antioxidant
  • the filler is added to this mixture using a pressure kneader or a Banbury mixer.
  • Add and mix under pressure After that, stop the pressurization and continue rotating the rotor of the pressure kneader or Banbury mixer, and pulverize the mixture by rotating the rotor to form a granular material.
  • the rotor mentioned here refers to a pressurized eder or a metal blade that forcibly agitates the material inside the Banbury mixer.
  • the filler used here can be of any kind as long as it is a filler that requires a high filling, but it is preferable to use a powder filler because the finished shape is a granular material.
  • the intended purpose of the powder is an electromagnetic wave absorber
  • magnetic powder is used.
  • a description will be given mainly of a magnetic substance powder for an electromagnetic wave absorber, but the present invention is not limited thereto.
  • the use of magnetic 1 biological powder as a filter is This is one of the preferable means for making the invention effective.
  • the electromagnetic wave absorbing effect is further increased, so that a favorable result can be obtained.
  • the filler In the case of the filler, high filling leads to adding the inherent properties of the filler to the molded body. Therefore, the higher the filling rate of the filler, the better, but it is preferable that the filler Z polymer> 30Z70 in volume ratio. In the finished molded product, the effect of the filler becomes clear when the content is 30 V o 1% or more.
  • Another invention of the present invention relates to a method of compressing a filler-filled resin powder produced using a magnetic material powder using an injection molding machine provided with a screw having a compression ratio of 1.5 or less. And heating and pressurizing the magnetic filler and the highly-filled resin powder in a compression molding die.
  • This is a method for producing a molded article highly oriented and highly filled with a flat magnetic filler, which is characterized in that a molded article highly oriented and highly filled is pre-prepared at room temperature to 120 ° C.
  • Still another invention of the present invention is a rubber extruder equipped with a resin powder granule highly filled with a flat magnetic filler, and a screw having the same groove depth and a smaller pitch toward the tip.
  • the present invention is a method for producing a sheet-like molded article in which a flat magnetic filler is highly oriented and highly filled, characterized in that the molded article is rolled using a roll.
  • a sheet-like molded body highly flattened and highly filled with a flat magnetic filler produced by the method for producing the sheet is subjected to pre-preda molding at room temperature to 120 ° C. It is a manufacturing method.
  • the polymer used in the present invention may be any polymer as long as it has a function of connecting the fillers and maintaining the shape.
  • Polyol It is preferable to use an elastomer such as a fin or rubber. Particularly, chlorinated polyethylene, polyamide, polybutylene terephthalate, EPDM and the like are preferably used.
  • the filler is a powdery filler, the filler can be used as a highly-filled resin particle, but it has a particularly high electromagnetic wave absorbing property. Fine metal powders such as ferrite powder and permalloy powder, and metal oxides. It is preferable to use sardine powder.
  • the shape of the powder is flat because the flat magnetic body is highly oriented parallel to the sheet surface by the means of the present invention, and exhibits excellent electromagnetic wave absorption performance.
  • the larger the volume ratio of the filler and the polymer, the better the electromagnetic wave absorption performance as the ratio of the filler is higher, and the filler polymer 20/80 or more, preferably 40/60 or more, and more preferably 550 or more. I do.
  • the volume ratio of the filler in the molded product may decrease slightly due to air entrapment or the like.However, when the molded product is formed, the volume of the filler in the total volume is 15% or more. It is preferably at least 30%, more preferably at least 40%.
  • the polymer used here is in the shape of a powder or pellet, when the polymer and a large amount of filler are put into a pressure kneader or Banbury mixer at the same time, the rotor of the pressure kneader or Banbury mixer rotates. However, in some cases, the shear is not applied, and the polymer gels and does not enter a state where mixing is performed. In this case, use a pressure kneader or Banbury mixer to primarily mix the polymer and additives other than fillers such as antioxidants to solve this problem. If the polymer is a belt-like rubber, primary mixing is not required.
  • the pressure kneader or the rotor of a Banbury mixer is turned until the temperature of the mixture obtained by the primary mixing reaches a predetermined temperature due to shearing heat.
  • e / N i: 1: 1 alloy powder, diameter 20 ⁇ , thickness l / zm, specific gravity 8.35) are added little by little.
  • the target filler has the highest filling ratio, and the mixture is mixed until the temperature of the mixture reaches a predetermined temperature.
  • the pressure lid is opened, the pressure is released, and the rotor is continuously rotated to form the mixture into a granular form.
  • the filler-highly-filled resin granular material (filler: polymer volume ratio of 40: A mixture powder having a high filler concentration of 60 or more is obtained.
  • Mixing with a pressurized ader or Banbury mixer Kneading progresses by giving a share to the material by the pressure of the rotor and the rotation of the rotor. Since it is very brittle, it is pulverized (depressurized pulverization) by the rotation of the rotor and becomes powdery. In other words, by utilizing the brittleness of the material, it is possible to pulverize the material that had been in a lump immediately after mixing into a fine size that can be put into the next process.
  • the resin particles which are highly filled with the filler generally do not melt or plasticize only by heating. It also has a very slippery property on glossy metal surfaces such as the inside of molding machines. Therefore, even if the powder is heated and the injection is attempted by the forward force of the screw of the molding machine, the powder will only be clogged at the tip of the molding machine and only go around the same place. Either the screw torque stops above the upper limit of the equipment, or the resin temperature rises due to friction, and the resin is decomposed.
  • the screw mainly functions to feed the material into the compression molding die, and the material is heated and pressed in the compression molding die. Therefore, a screw with a compression ratio of 1.5 or less is used.
  • the compression ratio refers to groove depth at the root of the screw / groove depth near the tip of the screw. In the present invention, it is preferable that the groove depth is substantially the same from the root to the tip of the screw.
  • the set temperature of the heating cylinder of the molding machine varies depending on the type of resin used.
  • the front (supply side) temperature is set at 40 ° C to 120 ° C. C preferably at 50 ° C to 80 ° C, medium 'rear (discharge side) temperature at 10 ° C to 50 ° C, preferably 10 ° C to 30 ° C, like at the tip The lower the temperature, the better.
  • the injection pressure is at least 30 MPa, preferably at least 5 OMPa, more preferably at least 100 MPa.
  • the heating temperature in the compression mold is preferably from 60 to 120 ° C., and the pressure is preferably from 25 to: L0 OMPa.
  • the highly filled magnetic material molded product obtained by the method of the present invention can be improved in heat resistance, strength, toughness and the like by irradiating it with ionizing radiation and crosslinking. .
  • the ionizing radiation may be a gamma source such as cobalt. It may be a beta ray by a speed gear.
  • pre-preda molding As another molding method, there is pre-preda molding. This means preforms a flat, highly-filled, highly-filled sheet of magnetic material at room temperature to 120 ° C by pre-preda molding.
  • This pre-preda molding refers to the process of once forming a sheet into a compressed air. Molding, vacuum forming, embossing, etc. For example, forming into a box-like shape.
  • Pre-preda molding can be performed using commercially available equipment.
  • air pressure molding can be carried out using a commercially available embossed carrier tape molding machine with an embossing function.
  • the softening point of the polymer and the temperature around the melting point of the crystal are over a hundred. Mold at C level.
  • the molding temperature of the pre-preda molding is preferably 25 ° C. (room temperature) to 120 ° C., and 25 ° C. (room temperature) to 70 ° C.
  • the temperature is more preferably 25 ° C (room temperature) to 50 ° C.
  • the molding pressure is preferably set to 0.5 to 2.0 MPa.
  • a flat magnetic material filler-highly filled resin is previously formed into a sheet.
  • a desired shape can be obtained by pre-preda molding as a molded body.
  • the temperature immediately after extrusion exceeds 100 ° C, the cohesive force of the resin will be weakened and it will not be possible to form the beads well, so the temperature should be adjusted so that the resin temperature immediately after extrusion becomes 100 ° C or less. Adjust and extrude.
  • a rubber extruder is used to highly fill the flat magnetic filler formed into beads.
  • the molded resin is rolled at a predetermined temperature through a pair of rolls having a narrow gap and formed into a sheet.
  • the temperature of the roll is preferably from room temperature to 100 ° C., and the gap between the rolls is preferably from 0.2 to L mm.
  • the sheet-like formed body highly filled with the flat magnetic filler thus formed is subjected to pre-preda molding at room temperature to 120 ° C. as described above.
  • the sheet obtained in this manner has a flat magnetic filler surface highly oriented parallel to the sheet surface, has excellent radio wave absorption performance, and has mechanical strength sufficient for practical use, and It has flexibility, that is, it has toughness.
  • heat resistance, strength, and toughness can be improved by irradiating the sheet with an electron beam to crosslink.
  • the filler obtained as a particulate form by depressurizing and pulverizing the highly-filled resin powder has a proportion of flat permalloy powder in the whole powder which is measured.
  • the volume filling ratio was about 50%, and the molded body using the powdery granules had strong electromagnetic wave absorption characteristics, that is, characteristics of converting electromagnetic waves into heat energy.
  • the filler-highly filled resin powder obtained in Example 1 was formed into a molded product using the following injection molding machine and conditions.
  • the key points are the compression ratio of the screw and the temperature before and after the heating cylinder.
  • the compression ratio of the screw is 1.
  • the screw back pressure is 3.5 MPa and the resin is conveyed.
  • the temperature at the front of the heating cylinder (supply side) was 55 ° C.
  • the temperature inside and behind the heating cylinder (injection side) was kept at room temperature.
  • the injection pressure was set at 155 MPa.
  • Example 2 The conditions were the same as in Example 2 except that the temperature at the front of the heating cylinder (supply side) was set at 20 ° C.
  • Example 2 The conditions were the same as in Example 2 except that the temperature at the rear (injection side) in the heating cylinder was set to 55 ° C.
  • the flat permalloy powder highly-filled material powder is sent to the compression molding die, the flat permalloy powder high-filled material powder is heated to 55 ° C in the compression molding die, and the pressure is reduced to 0.5 ° C.
  • a pressure of 5 ton / cm 2 (49 MPa) a molded article having electromagnetic wave absorption characteristics and excellent mechanical strength was obtained.
  • the resulting bead was rolled with two 7-inch rolls with the gap between the rolls set to 0.5 mm and the temperature adjusted to 50 ° C. As a result, a flexible, flat permalloy powder-filled sheet was obtained. Obtained.
  • the flat permalloy powder is highly oriented parallel to the surface of the sheet, has excellent radio wave absorption performance, and has sufficient strength, mechanical strength to withstand practical use, and flexibility. That is, it was tough.
  • This sheet is pressure-formed using a prototype machine with an embossing function added to the embossing taper HVT32DEV manufactured by Hagiwara Kogyo Co., Ltd., and has a length of 10 ram, a width of 15 ran and a depth of 3 mm. Formed into a shape.
  • the conditions of the pressure forming were set as follows.
  • the compressed air temperature is 25 ° C (room temperature).
  • the compressed air forming pressure is 1.0 MPa.
  • the embossing temperature is 60 ° C. Cooling temperature after embossing is 25 ° C (room temperature).
  • a resin molded product utilizing characteristics of a filler can be obtained by highly filling a polymer with a filler having various characteristics.
  • Highly-filled resin particles obtained by combining a magnetic powder and a polymer have electromagnetic wave absorption characteristics, that is, characteristics of converting electromagnetic waves into heat energy, and are provided by a roll, an extruder, an injection molding machine, or the like. Since it can be formed into a free shape by itself, it can be used in casings of mobile communication devices such as mobile phones and PHS, which use the quasi-microwave to microwave band, and other devices that use electromagnetic waves. It has high utility value.
  • ADVANTAGE OF THE INVENTION According to the method of this invention, a magnetic substance powder can be highly filled in an organic polymer, and the molded object molded using the obtained resin powder has a strong electromagnetic wave absorption characteristic, and Excellent mechanical strength. In particular, since a flat magnetic powder can be used and oriented parallel to the surface of the molded body, a molded body having excellent electromagnetic wave absorption performance can be obtained.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne un procédé de production de granules de résine comprenant une charge et permettant de remplir un polymère avec une densité élevée. L'invention concerne également un procédé destiné à produire un produit moulé de résine au moyen des granules de résine produits remplis d'une charge avec une densité élevée. On utilise une charge de forme plane pour former ces granules de résine en un produit moulé en feuille présentant une orientation de charge améliorée. On produit alors un produit moulé de résine utilisant avantageusement cette orientation au moyen d'un procédé de moulage de pré-imprégné. Un produit de résine moulé utilisant un matériau absorbant les ondes électromagnétiques comme charge peut être utilisé universellement pour l'absorption d'ondes électromagnétiques dans un équipement de communication mobile utilisant une zone de pseudo-microondes/microondes.
PCT/JP2002/009803 2001-09-27 2002-09-24 Procedes de production de granules de resine remplis d'une charge avec une densite elevee, et produit moule constitue par ces granules WO2003028911A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2001-295203 2001-09-27
JP2001-295202 2001-09-27
JP2001295203A JP2003096200A (ja) 2001-09-27 2001-09-27 フィラー高充填材料粉末の製造方法
JP2001295202A JP2003094507A (ja) 2001-09-27 2001-09-27 偏平状磁性体フィラーの高配向、高充填シートの製造方法
JP2001-305925 2001-10-02
JP2001305924A JP2003103618A (ja) 2001-10-02 2001-10-02 偏平な磁性体フィラーの高配向且つ高充填成形品の製造方法
JP2001-305924 2001-10-02
JP2001305925A JP2003103530A (ja) 2001-10-02 2001-10-02 磁性体フィラー高充填成形品の製造方法

Publications (1)

Publication Number Publication Date
WO2003028911A1 true WO2003028911A1 (fr) 2003-04-10

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Application Number Title Priority Date Filing Date
PCT/JP2002/009803 WO2003028911A1 (fr) 2001-09-27 2002-09-24 Procedes de production de granules de resine remplis d'une charge avec une densite elevee, et produit moule constitue par ces granules

Country Status (1)

Country Link
WO (1) WO2003028911A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4926367A (fr) * 1972-07-05 1974-03-08
JPS5528873A (en) * 1978-08-23 1980-02-29 Matsushita Electric Works Ltd Method of manufacturing forming material
JPS608014A (ja) * 1983-06-27 1985-01-16 Aron Kasei Co Ltd プラスチツク成形材料
JPS60240736A (ja) * 1984-05-14 1985-11-29 Nippon Ester Co Ltd 原着ポリエステルの製造法
JPH03108301A (ja) * 1989-09-21 1991-05-08 Tokin Corp 複合磁性体の製造方法
JP2001076913A (ja) * 1999-09-06 2001-03-23 Tokin Corp 電磁干渉抑制体およびその製造方法
EP1096844A1 (fr) * 1999-10-25 2001-05-02 Tokin Corporation Matériau magnétique composite, procédé de fabrication et couche permettant de supprimer les interférences electromagnétiques

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4926367A (fr) * 1972-07-05 1974-03-08
JPS5528873A (en) * 1978-08-23 1980-02-29 Matsushita Electric Works Ltd Method of manufacturing forming material
JPS608014A (ja) * 1983-06-27 1985-01-16 Aron Kasei Co Ltd プラスチツク成形材料
JPS60240736A (ja) * 1984-05-14 1985-11-29 Nippon Ester Co Ltd 原着ポリエステルの製造法
JPH03108301A (ja) * 1989-09-21 1991-05-08 Tokin Corp 複合磁性体の製造方法
JP2001076913A (ja) * 1999-09-06 2001-03-23 Tokin Corp 電磁干渉抑制体およびその製造方法
EP1096844A1 (fr) * 1999-10-25 2001-05-02 Tokin Corporation Matériau magnétique composite, procédé de fabrication et couche permettant de supprimer les interférences electromagnétiques

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