WO2000060574A1 - Materiau acoustique - Google Patents

Materiau acoustique Download PDF

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Publication number
WO2000060574A1
WO2000060574A1 PCT/JP1999/001776 JP9901776W WO0060574A1 WO 2000060574 A1 WO2000060574 A1 WO 2000060574A1 JP 9901776 W JP9901776 W JP 9901776W WO 0060574 A1 WO0060574 A1 WO 0060574A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
film
absorbing material
active ingredient
absorbing
Prior art date
Application number
PCT/JP1999/001776
Other languages
English (en)
Japanese (ja)
Inventor
Yasuyuki Ohira
Mitsuo Hori
Original Assignee
Shishiai-Kubishikigaisha
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 Shishiai-Kubishikigaisha filed Critical Shishiai-Kubishikigaisha
Priority to PCT/JP1999/001776 priority Critical patent/WO2000060574A1/fr
Publication of WO2000060574A1 publication Critical patent/WO2000060574A1/fr

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/165—Particles in a matrix

Definitions

  • the present invention relates to a recording / reproducing apparatus using a magnetic medium such as a tape recorder, an MD recorder, a digital audio tape recorder (DAT recorder), and a video recorder, a video camera, etc. It relates to sound absorbing materials that can be used in a wide range of applications, such as precision equipment such as video recording / reproducing equipment, soundproof covers applied to pipes in buildings, other home appliances, vehicle linings, and interior materials for houses.
  • this sound-absorbing film had low sound-absorbing properties, and did not sufficiently solve the problem.
  • Another problem with this sound absorbing film is that if it gets too loud, it will be deformed and no longer vibrate.
  • the present inventors have conducted intensive studies to propose a sound absorbing material that has sufficient sound absorbing properties, is hardly deformed even when a loud sound is hit, and is capable of efficiently absorbing sound. As a result, the amount of dipole moment in the sound absorbing film has a deep relationship with the sound absorption.
  • the sound-absorbing material of the present invention is characterized in that a sound-absorbing film in which an active ingredient for increasing the amount of dipole moment is blended with a polymer material is stretched between lattices of a net-like material.
  • This sound-absorbing material is used for precision recording and playback devices that use magnetic media such as tape recorders, MD recorders, and digital audio tape recorders (DAT recorders), and video recording and playback devices such as video recorders and video cameras. It can be applied to a wide range of applications, such as soundproof covers applied to equipment and piping in buildings, linings of other home appliances and vehicles, and interior materials of houses. First, the sound absorbing film of the sound absorbing material of the present invention will be described.
  • polymer material constituting the sound absorbing film examples include polyvinyl chloride, polyethylene, chlorinated polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polymethyl methacrylate, polyvinylidene fluoride, polyisoprene, polystyrene, and styrene.
  • polyvinyl chloride is preferred because it has good moldability and is inexpensive.
  • vibration is generated.
  • a displacement occurs in the dipole 12 existing inside the film 11 as shown in FIG.
  • the displacement of the dipoles 12 means that each dipole 12 in the film 11 rotates or shifts in phase. It can be said that the arrangement state of the dipoles 12 inside the film 11 before the sound energy is applied as shown in FIG. 1 is in a stable state.
  • each dipole 1 2 inside the film 11 becomes unstable. And each dipole 12 tries to return to the stable state shown in FIG.
  • the amount of dipole moment generated inside the film changes depending on the temperature and sound frequency when sound is applied.
  • the amount of dipole moment also changes depending on the magnitude of the sound energy applied to the film.
  • the polymer material that composes the film not only the amount of dipole moment, but also the handling properties, moldability, availability, temperature performance (heat resistance and cold resistance), weather resistance, price, etc., depending on the application and use form of the sound absorbing material.
  • an active ingredient capable of dramatically increasing the amount of dipole moment in the film is incorporated in the polymer material constituting the film.
  • the active component is a component that dramatically increases the amount of dipole moment in the film.
  • the active component itself has a large dipole moment, or the active component itself has a small dipole moment. It means a component that can dramatically increase the amount of dipole moment inside the film by blending the active component. For example, the amount of dipole moment generated inside film 11 under the given temperature conditions, sound frequency, and energy level is the same as shown in Fig. 3 by adding the active ingredient to this. Under the conditions, it will increase by a factor of three or ten.
  • MBTS N-cis sulfenamide
  • CBS N-tert-phenamide
  • BSS N-oxyxeti
  • HMBP 2-hydroxyl 4-methoxybenzophenone
  • HMBP S 2-hydroxy-14-methoxybenzophenone-15-sulfonic acid
  • the compounding amount of the above-mentioned active ingredient is preferably from 10 to 300 parts by weight based on 100 parts by weight of the polymer material. For example, if the amount of the active ingredient is less than 10 parts by weight, the effect of adding the active ingredient to increase the amount of the dipole moment cannot be obtained, and the amount of the active ingredient is 300 parts by weight.
  • the ratio exceeds, it may not be fully compatible.
  • the active ingredient contained in the polymer material it is preferable to take into consideration the easiness of compatibility of the active ingredient and the polymer material, that is, the SP value, and to select a substance having a similar value.
  • the amount of dipole moment in the active ingredient is the dipole moment inside the film. As with the amount of the active ingredient, it varies depending on the type of the active ingredient. Even when the same active ingredient is used, the amount of dipole moment generated inside the film changes depending on the temperature when sound energy is applied. Also, the amount of dipole moment changes depending on the magnitude of the sound energy applied to the film.
  • the sound absorbing film of the present invention can be obtained by blending a polymer material and an active ingredient, and if necessary, a corrosion inhibitor, a dye, and the like, and forming the blend into a film.
  • a conventionally known method can be used as a molding method when the above polymer material and the active ingredient are blended and the blend is molded into a film.
  • the sound absorbing film thus obtained has excellent sound absorbing properties that cannot be predicted from the sound absorbing properties of conventional sound absorbing films.The thinner its performance, the more sensitive it is to the sound.
  • the sound-absorbing film 13 of the present invention is made of a net-like material 15 so that the sound-absorbing film 14 is hardly deformed even when a loud sound is hit so that sound can be efficiently absorbed. It was stretched between lattices.
  • the net-like material 15 is a plastic net, a wire mesh, a knitted fabric, or the like, which is laminated on the sound-absorbing film 14, and the sound-absorbing film 14 is stretched between the lattices of the net-like material 15. It is.
  • each lattice of the net-like object 15 is formed so that the sound absorbing film 14 is not deformed.
  • the sound absorbing film 14 is infinitely thin, it is possible to apply a film that is infinitely thin, sensitive and easy to vibrate, and is compatible with the excellent sound absorbing property of the sound absorbing film 14 itself.
  • the sound absorption provided by the shape preservation of the film by each lattice of the net-like object 15 is further improved.
  • the sound absorbing material 13 since the sound absorbing film 14 is supported by the net-like material 15, the sound absorbing material 13 has an advantage that it is easy to handle and can be freely cut into a desired shape.
  • the ratio (aspect ratio) of the thickness of the sound absorbing film 14 to the lattice spacing of the net-like material 15 in the sound absorbing material 13 is desirably 100 or less. That is, according to the experiments of the present inventors, the aspect ratio between the thickness (t) of the sound absorbing film 14 and the lattice spacing (d) of the net-like object 15 is represented by rcZtj. It has been confirmed that the sound absorption decreases as the lattice spacing (d) becomes larger or the thickness (t) becomes smaller, for example, when the value exceeds 1000. In addition, the present invention proposes another sound absorbing material that is hardly deformed even when hit by a loud sound, so that sound can be efficiently absorbed. As shown in FIG.
  • the entire sound absorbing material 23 is composed of a mixture of the above-described polymer material and an active ingredient, and the sound absorbing material 23 is composed of a large number of grid portions 25 and each of these grid shapes. It consists of a film-like part 24 placed between the lattices of the part 25.
  • the grid-like portion 25 and the film-like portion 24 can be formed integrally and simultaneously by a thin injection molding method, and as shown in FIG. There is no need to prepare a film and a net-like material separately and laminate them together via an adhesive, for example, and there is a risk that the sound-absorbing film and the net-like material may be separated due to poor bonding. Absent.
  • FIG. 1 is a schematic diagram showing dipoles inside a film.
  • Figure 2 is a schematic diagram showing the state of the dipole inside the film when vibration energy is applied.
  • FIG. 3 is a schematic diagram showing a dipole state inside a film when an active ingredient is blended.
  • FIG. 4 is a cross-sectional view showing the sound absorbing material of the present invention.
  • FIG. 5 is a sectional view showing another example of the sound absorbing material of the present invention.
  • Chlorinated polyethylene Eraslene 352 NA, (chlorinated polyethylene content: 35% by weight) manufactured by Showa Denko KK) and DCHB SA (Sanceraichi DZ-G, Sanshin Chemical) Manufactured by Kogyo Co., Ltd.) and 100/0, 90/100, 80/20, 70/30, 60/40, and 550, respectively. It is put into a kneader, kneaded, and then hot pressed by a press machine to produce a sound absorbing film (0.2 mm thick).
  • a polyethylene net (mesh) having a lattice spacing of 10 mm was laminated and integrated via an adhesive to obtain a sound absorbing material.
  • Measurement of normal incidence sound absorption coefficient Each of the obtained sound-absorbing materials is punched out to a size of 91.6 mm in diameter (for A pipe) and 40 mm in diameter (for B pipe) to make a test piece.
  • a normal incidence sound absorption coefficient measuring device manufactured by Co., Ltd.
  • the area connecting the graph line of the measurement results and the bottom of the graph was determined as a percentage of the total area of the graph, and this was defined as the sound absorption area ratio.
  • the maximum value in the graph of the sound absorption coefficient was defined as the maximum sound absorption coefficient. Table 1 shows the results. For comparison, the sound absorption area ratio and the maximum sound absorption ratio were similarly obtained for only the sound absorbing film having no net laminated and integrated.
  • the sound absorption area ratio without mesh is 11.8 to 14.1%, while the sound absorption area ratio is 19.9 to 29.9% when the mesh is integrated. Improved.
  • the maximum sound absorption coefficient is 0.80 to 0.86 when there is no mesh, whereas it is 0.88 to 0.94 when there is a mesh.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Building Environments (AREA)

Abstract

L'invention concerne un matériau acoustique ayant de nombreuses applications, notamment dans le domaine des enregistreurs magnétiques tels que les enregistreurs à bande magnétique, les enregistreurs MD et les enregistreurs audionumériques (DAT), les dispositifs vidéo sophistiqués tels que les magnétoscopes à bande et les caméras vidéo, les bandes acoustiques pour la tuyauterie des bâtiments, les revêtements d'appareils électroménagers et d'automobiles, et les matériaux de construction. Ledit matériau acoustique comprend un filet, notamment un filet plastique, recouvert d'un film polymère acoustique renfermant un composant actif destiné à augmenter le moment dipolaire.
PCT/JP1999/001776 1999-04-02 1999-04-02 Materiau acoustique WO2000060574A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/001776 WO2000060574A1 (fr) 1999-04-02 1999-04-02 Materiau acoustique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/001776 WO2000060574A1 (fr) 1999-04-02 1999-04-02 Materiau acoustique

Publications (1)

Publication Number Publication Date
WO2000060574A1 true WO2000060574A1 (fr) 2000-10-12

Family

ID=14235384

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/001776 WO2000060574A1 (fr) 1999-04-02 1999-04-02 Materiau acoustique

Country Status (1)

Country Link
WO (1) WO2000060574A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5145825A (en) * 1974-10-16 1976-04-19 Asahi Glass Co Ltd Kyuonpanto sonoseizohoho
JPS6432943A (en) * 1987-07-30 1989-02-02 Nippon Tokushu Toryo Co Ltd Light weight sound absorbing material for automobile
JPH09330086A (ja) * 1996-06-12 1997-12-22 Cci Corp 吸音材料
JPH10139933A (ja) * 1996-11-07 1998-05-26 Cci Corp 防振材料
JPH10143164A (ja) * 1996-11-07 1998-05-29 Cci Corp 吸音シート

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5145825A (en) * 1974-10-16 1976-04-19 Asahi Glass Co Ltd Kyuonpanto sonoseizohoho
JPS6432943A (en) * 1987-07-30 1989-02-02 Nippon Tokushu Toryo Co Ltd Light weight sound absorbing material for automobile
JPH09330086A (ja) * 1996-06-12 1997-12-22 Cci Corp 吸音材料
JPH10139933A (ja) * 1996-11-07 1998-05-26 Cci Corp 防振材料
JPH10143164A (ja) * 1996-11-07 1998-05-29 Cci Corp 吸音シート

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