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WO2008099447A1 - Procédé de production de diaphragme pour transducteur électroacoustique et diaphragme pour transducteur électroacoustique - Google Patents

Procédé de production de diaphragme pour transducteur électroacoustique et diaphragme pour transducteur électroacoustique Download PDF

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Publication number
WO2008099447A1
WO2008099447A1 PCT/JP2007/052073 JP2007052073W WO2008099447A1 WO 2008099447 A1 WO2008099447 A1 WO 2008099447A1 JP 2007052073 W JP2007052073 W JP 2007052073W WO 2008099447 A1 WO2008099447 A1 WO 2008099447A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
carbon nanotubes
electroacoustic
carbon nanotube
matrix resin
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/JP2007/052073
Other languages
English (en)
Japanese (ja)
Inventor
Kenta Yujima
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.)
Foster Electric Co Ltd
Original Assignee
Foster Electric Co 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 Foster Electric Co Ltd filed Critical Foster Electric Co Ltd
Priority to PCT/JP2007/052073 priority Critical patent/WO2008099447A1/fr
Priority to JP2008557909A priority patent/JP4869358B2/ja
Publication of WO2008099447A1 publication Critical patent/WO2008099447A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/023—Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials

Definitions

  • the present invention performs surface treatment of carbon nanotubes to provide chemical bonds with the matrix resin, thereby improving elastic modulus and tensile strength.
  • the present invention relates to a method of manufacturing a diaphragm for an electrical yellowing phenomenon with improved sound quality and durability, and a diaphragm for an electroacoustic modification m3 ⁇ 4 produced by the manufacturing method.
  • a molding material for the electroacoustic change diaphragm there is a composite material in which a matrix resin is reinforced with a powder such as high elastic modulus carbon or mist.
  • the diaphragm for electroacoustic transducers is lightweight, has high elasticity, has high internal loss, and has excellent moldability, dimensional stability, heat resistance, etc. You can get
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2 0 0 3— 3 1 9 4 8 8
  • the present invention has been proposed to solve the above-mentioned! ⁇ .
  • the purpose of the present invention is to apply a surface treatment to the carbon nanotubes, to make the binding force between the Matritas resin and the carbon nanotubes sufficient, and to obtain an elastic modulus.
  • the purpose of this invention is to provide a method for manufacturing a diaphragm for an electroacoustic deformation and a diaphragm for the electroacoustic deformation with improved tension strength and the like, a higher high frequency limit and a reduced distortion. . Disclosure of the invention
  • a method for manufacturing a diaphragm for electroacoustic transformation comprises strengthening a Matritas resin with carbon nanotubes that have been surface-treated for imparting a chemical bond with a matrix resin. It is characterized by being molded from a composite material.
  • the chemical bond means a bond such as a covalent bond or a ionic bond between the matrix resin and the carbon nanotube interface.
  • an aluminum-based coupling agent compound is chemically bonded to the surface of the carbon nanotube to form an organic film, and the surface-treated carbon nanotube strengthens the Matritas resin. It is characterized by being molded with a composite material.
  • a solution in which an aluminum-based coupling agent is added to hexane is heated with heat, carbon nanotubes are added to the solution, and the hexane is stirred while refluxing, and then the hexane is dried to perform a coupling treatment.
  • the carbon nanotubes are molded from a composite material reinforced by kneading with the Matritas resin. .
  • a functional group is added to the surface of the carbon nanotube, and a diaphragm for electroacoustic transformation is formed by a composite material in which the matrix resin is strengthened by the surface-treated carbon nanotube.
  • the carbon nanotubes are chemically bonded to the matrix resin.
  • the functional group is an amino group.
  • Amino group modification on the surface of carbon nanotubes involves adding carbon nanotubes to aqua regia and heating, filtering this solution through filter paper, heating and drying the carbon nanotubes remaining on the filter paper, And triethylenetetra After the ultrasonic treatment by adding min, the solution is heated, the solution is filtered through a filter paper, the carbon nanotubes remaining on the filter paper are dried, and the surface treatment of the carbon nanotubes is performed.
  • the diaphragm for electroacoustic transformation ⁇ is formed of a composite material in which the matrix resin is strong.
  • an organic film is formed by chemically bonding a mixture of a film-based force pulling agent to the surface of the carbon nanotube, or A functional group is added to the surface of the carbon nanotube, and the rigid carbon nanotube is chemically bonded to the matrix resin.
  • the carbon nanotubes constrain the matrix resin, thus improving the elastic modulus and tensile strength.
  • Restraining the matrix resin means suppressing the mobility of the molecular chain of the matrix resin.
  • the diaphragm for an electroacoustic transducer according to the present invention has a surface treatment on the carbon nanotubes and has strengthened the chemical bond with the matrix resin, so that the elastic modulus is improved.
  • the critical frequency increased, distortion decreased, and sound quality improved.
  • the electroacoustic diaphragm of the present invention has improved tensile strength, thereby improving durability.
  • FIG. 1 shows an electron micrograph of a carbon nanotube according to Example 1 of the present invention, in which an aluminum-based force pulling agent compound is chemically bonded to the surface to form an organic film.
  • 2 (a) and 2 (b) are explanatory views of the manufacturing process of the diaphragm by the injection molding machine.
  • FIG. 3 is a longitudinal sectional view of the produced electroacoustic alteration diaphragm.
  • FIG. 4 shows an electron micrograph of the carbon nanotube before the amino group is bonded.
  • FIG. 5 shows an electron micrograph of a carbon nanotube having an amino group bonded to the surface according to Example 2 of the present invention.
  • FIG. 6 shows frequency characteristics with respect to sound pressure in the conventional example and Example 2 of the present invention.
  • Carbon nanotubes having a diameter of 0.4 to 500 nm and a length of 0.06 to 200 ⁇ m were used.
  • the reason why the direct line is 0.4 nm or more is that it is difficult to produce smaller carbon nanotubes.
  • the reason why it is set to 50 Onm or less is that if it is larger than this, it will deviate from the desired physical properties of the diaphragm.
  • the reason why the value is 200 ⁇ or less is that if it is more than that, it will deviate from the desired physical properties of the diaphragm.
  • Matritas resin to be used examples include polypropylene (trade name: J108 ⁇ , Mitsui Chemicals, Inc.).
  • polystyrene-saturated thermoplastic elastomers [styrene / ethylene. Single polymer (SEBS), functionalized SEBS, styrene 'ethylene propylene styrene block copolymer, random hydrogenated styrene butadiene polymer, etc.), ethylene ether tartrate' maleic anhydride ternary copolymer Polymers, ethylene-based modified olefin copolymers, modified polyolefins, and the like, and these resins have relatively good adhesion to carbon nanotubes. You can use anything else.
  • Example 1 Power with aluminum coupling agent-preferred for surface treatment of Bonn nanotubes! Examples are as follows.
  • Hexane was dried at 90 ° C, coupled and surface-treated with carbon nanotubes.
  • Example 1 an aluminum-based force coupling agent compound was chemically bonded (covalently bonded) to the surface of the carbon nanotubes by the above treatment to form an organic film.
  • FIG. 1 is an electron micrograph of a carbon nanotube according to Example 1 in which the above compound is chemically bonded to the surface. This organic coating improves the affinity with the matrix resin, making it easier for the carbon nanotubes to get wet with the matrix resin, and at the same time increases the adhesive bow of the matrix tree.
  • the surface-treated carbon nanotubes and polypropylene (trade name J10 8 M, manufactured by Mitsui Engineering Co., Ltd.) were thoroughly kneaded through a well-known biaxial kneader to produce a molding material.
  • FIG. 2 shows a schematic cross-sectional view of the produced electroacoustic transducer diaphragm.
  • a preferred embodiment of the surface treatment by the amino group modification on the carbon nanotube surface is as follows.
  • This amino group is a functional group.
  • a functional group is an atomic group having polarity such as an amino group, a hydroxyl group, or a carboxyl group.
  • the functional group consisting of an amino group is imparted to the surface of the carbon nanotube by a chemical reaction, so that the affinity for the Matritas resin is improved, and the carbon nanotube is easily wetted by the matrix resin. At the same time, the “adhesion bow” with the Matrix Tree S is also increased.
  • Fig. 4 is an electron micrograph of a carbon nanotube before (non-treated) bonding of an amino group
  • Fig. 5 is an electron micrograph showing a state in which an amino group is bonded to the surface of the carbon nanotube.
  • ⁇ As can be seen from Fig. 5, the surface of the treated carbon nanotube is modified with an amino group, so the outer diameter is increased accordingly, and this amino group improves the wettability to the matrix resin, Strength Adhesive strength with Matritas resin is also increased.
  • This amino group-modified carbon nanotube is kneaded with the same polypropylene as in Example 1, the carbon nanotube is firmly bonded to the matrix resin, and the obtained pellet is similarly injection-molded to form a diaphragm for an electroacoustic transducer.
  • Example 1 This amino group-modified carbon nanotube is kneaded with the same polypropylene as in Example 1, the carbon nanotube is firmly bonded to the matrix resin, and the obtained pellet is similarly injection-molded to form a diaphragm for an electroacoustic transducer.
  • the diaphragm for electroacoustic deformation produced in Examples 1 and 2 has the advantage that the strength is increased and the durability is improved by increasing the bonding force between the matrix resin and the carbon nanotubes.
  • the binding force between the matrix resin and the carbon nanotubes increases, which increases the binding force on the matrix resin and improves the elastic modulus.
  • A is the frequency characteristic of the product of the present invention according to the second example, and B is a modified amino group.
  • the characteristics of a diaphragm made by injection-molding pellets obtained by kneading carbon nanotubes in a matrix resin are shown. It should be noted that the same characteristics can be obtained by using the force of the electroacoustic transducer diaphragm in the first embodiment.
  • the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
  • polypropylene is used as the synthetic resin in the above examples, other examples may be used.
  • amino groups are used as functional groups.
  • other functional groups may be used.
  • an example of producing a diaphragm by injection molding has been described, it can also be produced by extrusion molding.
  • the diaphragm shape is not limited to a conical shape, but may be a flat plate shape or other shapes.
  • the electroacoustic diaphragm according to the present invention is incorporated in a sound such as a sound force or a microphone.
  • a voice coil is coupled to this diaphragm, and when a voice signal is applied to the voice coil, the diaphragm vibrates by the voice coil and radiates sound waves.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Manufacturing & Machinery (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

La présente invention concerne un procédé de production de diaphragme pour transducteur électroacoustique par moulage d'un matériau composite constitué d'une résine matricielle renforcée avec des nanotubes de carbone présentant une surface traitée permettant la réalisation d'une liaison chimique avec la résine matricielle. Dans un traitement de surface, un revêtement de matériau organique comprenant un agent de couplage à base d'aluminium qui y est lié par liaison chimique est formé à la surface des nanotubes de carbone. Le matériau composite constitué de la résine matricielle renforcée avec les nanotubes de carbone à surface traitée est moulé en un diaphragme pour le transducteur électroacoustique. Dans un autre traitement de surface, la surface des nanotubes de carbone est dotée de groupes fonctionnels. Le matériau composite constitué de la résine matricielle renforcée avec les nanotubes de carbone à surface traitée pour former une liaison chimique entre les nanotubes de carbone et la résine matricielle est moulé en un diaphragme pour le transducteur électroacoustique.
PCT/JP2007/052073 2007-01-31 2007-01-31 Procédé de production de diaphragme pour transducteur électroacoustique et diaphragme pour transducteur électroacoustique Ceased WO2008099447A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2007/052073 WO2008099447A1 (fr) 2007-01-31 2007-01-31 Procédé de production de diaphragme pour transducteur électroacoustique et diaphragme pour transducteur électroacoustique
JP2008557909A JP4869358B2 (ja) 2007-01-31 2007-01-31 電気音響変換器用振動板の製造方法および電気音響変換器用振動板

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2007/052073 WO2008099447A1 (fr) 2007-01-31 2007-01-31 Procédé de production de diaphragme pour transducteur électroacoustique et diaphragme pour transducteur électroacoustique

Publications (1)

Publication Number Publication Date
WO2008099447A1 true WO2008099447A1 (fr) 2008-08-21

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PCT/JP2007/052073 Ceased WO2008099447A1 (fr) 2007-01-31 2007-01-31 Procédé de production de diaphragme pour transducteur électroacoustique et diaphragme pour transducteur électroacoustique

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JP (1) JP4869358B2 (fr)
WO (1) WO2008099447A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012017443A (ja) * 2010-07-09 2012-01-26 Nagoya Univ ポリアミドナノコンポジット

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012211011A1 (de) * 2012-06-27 2014-01-02 Robert Bosch Gmbh Akustischer Sensor mit einer Membran aus einem Faserverbundwerkstoff
CN112938939A (zh) * 2021-01-24 2021-06-11 南昌大学 一种碳修饰硅/二氧化硅包覆碳纳米管的制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003319488A (ja) * 2002-04-19 2003-11-07 Foster Electric Co Ltd 電気音響変換器用振動板
JP2005194497A (ja) * 2003-09-30 2005-07-21 Toray Ind Inc 熱可塑性樹脂組成物
JP2006137937A (ja) * 2004-10-12 2006-06-01 Showa Denko Kk シームレスベルト用樹脂組成物及びシームレスベルト
JP2006213569A (ja) * 2005-02-04 2006-08-17 Tokyo Institute Of Technology 表面処理カーボンナノファイバーおよびその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003319488A (ja) * 2002-04-19 2003-11-07 Foster Electric Co Ltd 電気音響変換器用振動板
JP2005194497A (ja) * 2003-09-30 2005-07-21 Toray Ind Inc 熱可塑性樹脂組成物
JP2006137937A (ja) * 2004-10-12 2006-06-01 Showa Denko Kk シームレスベルト用樹脂組成物及びシームレスベルト
JP2006213569A (ja) * 2005-02-04 2006-08-17 Tokyo Institute Of Technology 表面処理カーボンナノファイバーおよびその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012017443A (ja) * 2010-07-09 2012-01-26 Nagoya Univ ポリアミドナノコンポジット

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JP4869358B2 (ja) 2012-02-08
JPWO2008099447A1 (ja) 2010-05-27

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