WO2021115280A1 - Activated carbon sound-absorbing granules and sound-producing device - Google Patents

Activated carbon sound-absorbing granules and sound-producing device Download PDF

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Publication number
WO2021115280A1
WO2021115280A1 PCT/CN2020/134629 CN2020134629W WO2021115280A1 WO 2021115280 A1 WO2021115280 A1 WO 2021115280A1 CN 2020134629 W CN2020134629 W CN 2020134629W WO 2021115280 A1 WO2021115280 A1 WO 2021115280A1
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activated carbon
sound
iron oxide
particles
modified
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PCT/CN2020/134629
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French (fr)
Chinese (zh)
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潘泉泉
姚阳阳
牟雅静
李春
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歌尔股份有限公司
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/354—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/06—Acrylates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/16—Polyurethanes
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/52—Sound-insulating materials

Definitions

  • the present invention relates to the technical field of acoustics, in particular to an activated carbon sound-absorbing particle and a sound generating device.
  • the sound generating device is an important acoustic device in electronic products, which is used to convert electrical signals into sound signals.
  • the resonant frequency of the sound emitting device is an important acoustic performance index, and reducing the resonant frequency of the sound emitting device helps to improve the acoustic effect of the sound emitting device.
  • the invention provides an activated carbon sound-absorbing particles and a sound generating device, aiming at reducing the water absorption of the activated carbon sound-absorbing particles and reducing the resonance frequency of the sound generating device.
  • the present invention provides an activated carbon sound-absorbing particle, the activated carbon sound-absorbing particle is made by mixing activated carbon particles modified with iron oxide and a high molecular polymer binder; wherein,
  • the activated carbon particles modified by iron oxide include activated carbon particles and an iron oxide modified layer;
  • the proportion of iron oxide in the activated carbon particles modified with iron oxide is 0.5-10 wt%
  • the iron oxide modified activated carbon particles have a loose pore structure, and the pore structure includes nano-scale micropores and mesopores;
  • the particle size range of the activated carbon sound-absorbing particles is 50-1000 microns
  • the particle size of the iron oxide modified activated carbon particles ranges from 0.1 to 100 microns.
  • the activated carbon sound-absorbing particles contain two-dimensional graphite and/or three-dimensional graphite crystallites, and the activated carbon particles are a chaotic layer structure formed by random accumulation of molecular fragments of the two-dimensional graphite layer structure and/or three-dimensional graphite crystallites.
  • the iron oxide modified layer is located on the outer surface of the activated carbon particles and the inner surface of the pores, and the water absorption rate of the iron oxide modified activated carbon particles is less than 7%.
  • the proportion of iron oxide in the activated carbon particles modified with iron oxide is 2-6 wt%; the proportion of the activated carbon particles in the activated carbon particles modified with iron oxide is 90-99.5 wt%.
  • the pore diameter of the micropore is in the range of 0.5-2 nanometers, and the pore diameter of the mesopore is in the range of 2-3.5 nanometers.
  • the cumulative pore volume of the activated carbon particles modified with iron oxide ranges from 0.55 to 0.9 g/cm 3 .
  • the bulk density of the activated carbon particles modified with iron oxide is 0.05-1 g/cm 3 .
  • the particle size of the activated carbon sound-absorbing particles is in the range of 100-450 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.2-20 microns.
  • the polymer adhesive includes one or more of polyacrylic, polyvinyl alcohol, polystyrene, polyurethane, polyvinyl acetate, and polybutadiene rubber adhesives. ;
  • the proportion of the polymer adhesive in the activated carbon sound-absorbing particles ranges from 1 to 10% by weight.
  • the present invention also provides a sound generating device, including
  • a vibration component, the vibration component is arranged in the housing;
  • the accommodating cavity is provided with activated carbon sound-absorbing particles as described above.
  • the activated carbon sound-absorbing particles are made of a mixture of iron oxide-modified activated carbon particles and a polymer binder; the iron oxide-modified activated carbon particles It includes activated carbon particles and an iron oxide modified layer; the iron oxide modified activated carbon particles account for 0.5-10% of iron oxide; the iron oxide modified activated carbon particles have a loose pore structure, and the pore structure includes nanoscale
  • the particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns; the particle size of the iron oxide modified activated carbon particles is in the range of 0.1-100 microns.
  • Figure 1 is a graph of iron oxide content and water absorption of sound-absorbing particles provided by the present invention
  • Figure 2 is a graph of iron oxide content and cumulative pore volume of sound-absorbing particles provided by the present invention.
  • Fig. 3 is a graph of the iron oxide content and the resonance frequency reduction effect of the sound-absorbing particles provided by the present invention.
  • the embodiment of the present invention proposes an activated carbon sound-absorbing particle.
  • Putting the activated carbon sound-absorbing particles into the box of the sound device, through the adsorption and release of air, can be equivalent to expanding the volume of the box, increasing the volume of the chamber by a times, and a is greater than 1.
  • M ms is the quality of the sounding device unit
  • C ms is the equivalent sound compliance of the sounding device unit.
  • the resonance frequency f 01 of the sounding device is expressed as:
  • C ma is the air-acoustic compliance of the cabinet volume of the sound generating device.
  • the resonance frequency f 02 of the sounding device is expressed as:
  • the volume of the box is equivalently enlarged by a times (a>1) by the activated carbon sound-absorbing material, and it can be seen that f 02 is smaller than f 01 .
  • the forced vibration of the particles will consume the energy of the sound wave. This effect is equivalent to an increase in the acoustic compliance of the air in the volume of the box, thereby reducing the resonance frequency f 02 .
  • the activated carbon sound-absorbing particles provided by the present invention can be used in sound generating devices such as earphones, earpieces, speakers, sound boxes and the like.
  • the activated carbon sound-absorbing material is put into the rear acoustic cavity of the sound generating device to virtually expand the volume of the rear acoustic cavity, thereby reducing the resonance frequency of the sound generating device.
  • the effect of improving the acoustic performance of the sound generating device is achieved.
  • the activated carbon sound-absorbing particles are made by mixing activated carbon particles modified with iron oxide and a high molecular polymer binder; wherein,
  • the activated carbon particles modified by iron oxide include activated carbon particles and an iron oxide modified layer;
  • the activated carbon particles are mainly composed of three elements: carbon, hydrogen and oxygen.
  • the molecular formula of the iron oxide is Fe 2 O 3 .
  • the iron oxide modified layer is located on the surface of the activated carbon particles, wherein the surface of the activated carbon particles includes the outer surface and the inner surface of the pores.
  • the proportion of iron oxide in the activated carbon particles modified by iron oxide is 0.5-10 wt%; the proportion of the activated carbon particles is 90-99.5 wt%.
  • the proportion of the iron oxide may be 0.5wt%, 1wt%, 2wt%, 4wt%, 5wt%, 8wt%, 10wt%; the corresponding activated carbon particles account for 99.5wt%, 99wt% , 98wt%, 96wt%, 95wt%, 92wt%, 90wt%.
  • Fig. 1 is a graph of the iron oxide content and the water absorption rate of the sound-absorbing particles provided by the present invention.
  • the abscissa represents the content of iron oxide
  • the ordinate represents the water absorption
  • the first content refers to the iron oxide content of 0.5-1wt%
  • the second content refers to the iron oxide content of 1-2wt%
  • the third content It means that the iron oxide content is 2-4wt%
  • the fourth content refers to the iron oxide content of 5-8wt%
  • the fifth content refers to the iron oxide content of 8-10wt%.
  • the iron oxide content when the iron oxide content is the first When the first content is 0.5-1wt%, the water absorption rate is 33.4%; when the iron oxide content is the second content 2-2wt%, the water absorption rate is 19.3%; when the iron oxide content is the third content 2-4wt%, the water absorption rate When the iron oxide content is the fourth content 5-8wt%, the water absorption rate is 7.2%; when the iron oxide content is the fifth content 8-10wt%, the water absorption rate is 9.3%.
  • the content of the iron oxide is 2-10%, the water absorption is less than 10%, and when the content of the iron oxide is 2-4%, the water absorption is less than 7%. When the iron oxide content is 2-8%, good water absorption can be obtained. It can be seen that the activated carbon particles modified with iron oxide can significantly reduce water absorption.
  • the particle size of the activated carbon sound-absorbing particles is in the range of 100-450 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.2-20 microns.
  • the activated carbon sound-absorbing particles contain two-dimensional graphite and/or three-dimensional graphite microcrystals, and the activated carbon particles are a chaotic layer structure formed by random accumulation of molecular fragments of a two-dimensional graphite layer structure and/or three-dimensional graphite microcrystals.
  • the more the content of the chaotic layer structure in the activated carbon sound-absorbing particles the more uniform the pore structure and the smaller the pore size of the pore structure after the activated carbon sound-absorbing particles are processed through the carbonization process, thereby making the activated carbon sound-absorbing
  • the particles can produce a good effect of reducing the resonance frequency.
  • the particle size of the two-dimensional graphite layer structure and the three-dimensional graphite crystallites is less than 30 nanometers. If the particle size of the two-dimensional graphite layer structure and the three-dimensional graphite crystallites are within the above range, a uniform and fine pore structure can be better formed after random stacking. On the one hand, it is more conducive to the performance of activated carbon sound-absorbing materials to absorb and release air. On the other hand, the uniformity and stability of the pore structure of activated carbon particles can be improved, and the structural strength of products made of activated carbon sound-absorbing materials can be improved.
  • the iron oxide-modified activated carbon particles themselves may have one or more of spherical, quasi-spherical, flake-shaped, and rod-shaped structures.
  • spherical carbon particles after spherical carbon particles are bonded to form activated carbon sound-absorbing particles, a more uniform and finer pore structure can be formed between the carbon particles, thereby improving the acoustic performance of the activated carbon sound-absorbing particles.
  • the activated carbon particles modified with flake-shaped iron oxide can improve the structural stability of the activated carbon sound-absorbing particles and reduce the risk of powdering and damage.
  • the flaky iron oxide modified activated carbon particles are preferred from the perspective of industrial application.
  • the iron oxide modified activated carbon particles have a loose pore structure, the pore structure includes nano-scale micropores and mesopores; the pore diameter range of the micropores is 0.5-2 nanometers, and the pore diameter range of the mesopores is 2 -3.5 nm.
  • the micropores are mainly used to absorb and contain air molecules, while the mesopores can not only contain air molecules, but also play a role in allowing air molecules to enter and exit the micropores quickly, so that the activated carbon sound-absorbing material has a good The ability to respond to changes in air pressure.
  • the particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns; the particle size of the activated carbon sound-absorbing particles will affect the bulk density of the particles, the binder content and other factors, thereby affecting the effect of reducing the resonance frequency.
  • the particle size of the activated carbon sound-absorbing particles is less than 50 microns, the strength of the activated carbon sound-absorbing particles is relatively reduced. After it is applied to the box of the sound device, the vibration of the air and the change of the air pressure become more likely to cause the activated carbon sound-absorbing particles to powder and break. This problem will seriously affect the effect of particles in reducing the resonance frequency, and may affect the reliability of the sound generating device.
  • the particle size of the activated carbon sound-absorbing particles is greater than 1000 microns, the volume of the particles is relatively large, and the gap between the particles increases significantly.
  • the activated carbon sound-absorbing particles are placed in the box of the sound device, the bulk density of the particles is significantly reduced.
  • the amount of activated carbon sound-absorbing particles that can be filled is relatively reduced. Therefore, the material that can produce the virtual expansion effect is reduced, and the effect of reducing the resonance frequency is weakened.
  • the particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns, which can meet the performance requirement of reducing the resonance frequency.
  • the particle size of the activated carbon sound-absorbing particles is between 100-450 microns, the best packing density can be achieved, and the effect of reducing the resonance frequency is the best.
  • the particle size is 100, 200, or 250 microns.
  • the particle size range of activated carbon sound-absorbing particles is between 100-450 microns, the effect of reducing the resonance frequency can reach the optimal level.
  • the particle size range of the activated carbon sound-absorbing particles and the particle size range of the activated carbon particles can be designed in coordination.
  • the particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.1-100 microns.
  • the particle size of the activated carbon sound-absorbing particles is in the range of 100-450 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.2-20 microns. Therefore, by controlling the particle size, the optimum packing density can be achieved, and the resonance frequency can be reduced.
  • the particle size of the iron oxide modified activated carbon particles ranges from 0.1 to 100 microns.
  • the particle size of the iron oxide modified activated carbon particles will affect its own bulk density, and the size of the bulk density will affect the performance of air absorption.
  • the particle size of the iron oxide modified activated carbon particles is too small, the bulk density will increase significantly. Under a certain volume, the mass of the iron oxide modified activated carbon particles that can be filled decreases, and the performance of reducing the resonance frequency is also weakened. If the particle size of the iron oxide modified activated carbon particles is too large, the bulk density will be significantly reduced. Under a certain volume, an excessively large packing density will reduce the energy of the sound waves consumed when the particles in the space are forced to vibrate, which is equivalent to the reduction of the air acoustic compliance (C ma) in the volume of the sounder's cabinet. Will cause the performance of reducing the resonance frequency to be weakened.
  • C ma air acoustic compliance
  • the bulk density of the activated carbon particles modified with iron oxide is 0.05-1 g/cm 3 .
  • the bulk density can also be adjusted by factors such as the shape and carbon content of the activated carbon particles modified by iron oxide.
  • the cumulative pore volume of the activated carbon particles modified with iron oxide ranges from 0.55 to 0.9 g/cm 3 . Within this range, activated carbon sound-absorbing particles can have good acoustic performance, and there will be no problems such as reduced structural reliability and reduced content of iron oxide modified activated carbon particles. If the cumulative pore volume is less than 0.55, the adsorption and desorption capabilities of the iron oxide modified activated carbon particles for air molecules are revealed. The lower pore volume will cause air molecules to not smoothly enter and exit the activated carbon sound-absorbing particles, and the activated carbon sound-absorbing particles cannot absorb a large number of air molecules.
  • the ratio of the cumulative pore volume of the micropores to the cumulative pore volume of the mesopores ranges from 0.05-20.
  • the ratio of the two ranges from 0.1 to 5, for example, the ratio can be 1 or 2.
  • the ratio of the cumulative pore volume of micropores to the cumulative pore volume of mesopores the stronger the adsorption and desorption performance of air molecules.
  • This performance feature is mainly due to the fact that the micropores can provide a larger volume, which is beneficial to absorb air molecules, so that the equivalent expansion ratio of the sound device cabinet is increased, so the effect of reducing the resonance frequency is better.
  • the ratio of the above two does not exceed 20.
  • the effect of the activated carbon sound-absorbing particles in reducing the resonance frequency drops sharply.
  • the reason is that if the ratio is too large, the content of micropores is too high, and the size of most of the pore structures in the activated carbon sound-absorbing particles is too small, which hinders the convection of air and hinders the entry and exit of air molecules in the activated carbon sound-absorbing particles. This further affects the propagation of sound waves, and its effect on reducing the resonance frequency is drastically reduced.
  • Figure 2 is a graph of the iron oxide content and the cumulative pore volume of the sound-absorbing particles provided by the present invention.
  • the abscissa represents the content of iron oxide
  • the ordinate represents the cumulative pore volume in g/cm 3 .
  • the first content refers to the iron oxide content of 0.5-1wt%
  • the second content refers to the iron oxide content of 1-2wt%
  • the third content refers to the iron oxide content of 2-4wt%
  • the fourth content refers to the oxidation
  • the iron content is 5-8wt%
  • the fifth content means that the iron oxide content is 8-10wt%.
  • the cumulative pore volume is 0.82g/cm 3 ;
  • the cumulative pore volume is 0.79g/cm 3 ;
  • the cumulative pore volume is 0.71g/cm 3 ;
  • the cumulative pore volume is 0.68g/cm 3 ;
  • the cumulative pore volume is 0.55g/cm 3 , which shows that When the content of the iron oxide is 0.5-10 wt%, the cumulative pore volume is all less than 1 g/cm 3 .
  • Fig. 3 is a graph of the iron oxide content and the resonance frequency reduction effect of the sound-absorbing particles provided by the present invention.
  • the abscissa represents the iron oxide content
  • the ordinate represents the resonance frequency reduction effect, in Hz.
  • the first content refers to the iron oxide content of 0.5-1wt%
  • the second content refers to the iron oxide content of 1-2wt%
  • the third content refers to the iron oxide content of 2-4wt%
  • the fourth content refers to the oxidation
  • the iron content is 5-8wt%
  • the fifth content means that the iron oxide content is 8-10wt%.
  • the resonance frequency reduction effect when the iron oxide content is 0.5-1wt% of the first content, the resonance frequency reduction effect is 137Hz; When the iron content is the second content 1-2wt%, the resonance frequency reduction effect is 132Hz; when the iron oxide content is the third content 2-4wt%, the resonance frequency reduction effect is 130Hz; when the iron oxide content is the fourth content 5- At 8wt%, the resonance frequency reduction effect is 114Hz; when the iron oxide content is the fifth content 8-10wt%, the resonance frequency reduction effect is 100Hz. It can be seen that within the range of 0.5-10 wt% of iron oxide, as the iron oxide content increases, the resonance frequency reduction effect is better.
  • the embodiment of the present invention also provides optional types of the high molecular polymer adhesive, and the high molecular polymer adhesive is configured to ensure the shape and structural stability of the activated carbon sound-absorbing particles. It may not damage or block the pore structure in the activated carbon particles modified by iron oxide.
  • the high molecular polymer adhesive includes a high molecular polymer adhesive including polyacrylic, polyvinyl alcohol, polystyrene, polyurethane, polyvinyl acetate, and polybutadiene rubber adhesives. One or more of the adhesives.
  • the high molecular polymer adhesive can also be subsequently made into activated carbon sound-absorbing particles and then removed from the sound-absorbing particles through a degreasing process, thereby leaving a richer pore structure.
  • the mass ratio of the polymer adhesive in the activated carbon sound-absorbing particles ranges from 1 to 10% by weight. If the content of the polymer binder increases, the amount of the activated carbon particles modified with iron oxide is correspondingly reduced, and the air absorption performance will be affected. If the content of the polymer binder is too low, the activated carbon sound-absorbing particles are prone to problems such as powdering and crushing, resulting in reduced structural reliability.
  • the activated carbon sound-absorbing particles of the embodiment of the present invention have high absorption capacity and corresponding absorption coefficient for nitrogen molecules and other air molecules. Putting the activated carbon sound-absorbing particles provided by the embodiment of the present invention into the rear acoustic cavity of the micro speaker can effectively reduce the mid-low frequency resonance frequency of the micro speaker. The activated carbon sound-absorbing particles can change the acoustic compliance of the gas contained in the almost closed rear acoustic cavity.
  • the activated carbon sound-absorbing particles provided by the embodiment of the present invention are suitable for adjusting the resonance frequency of a substantially closed cavity.
  • the activated carbon sound-absorbing particles are filled into the box of the sound device, which can be equivalent to increasing the damping of the sound device, thereby reducing the resonance intensity. In turn, the electrical impedance peak value of the sound generating device is reduced.
  • the activated carbon sound-absorbing material provided by the embodiments of the present invention can repeatedly perform the adsorption and desorption of air molecules, and will not cause performance degradation due to repeated adsorption and desorption of air molecules.
  • the activated carbon sound-absorbing material can be used repeatedly for a long time.
  • the embodiment of the present invention also provides a generating device.
  • the sound generating device includes a housing in which a accommodating cavity is formed; a vibration assembly in which the vibration assembly is arranged in the housing; the accommodating cavity is provided with activated carbon sound-absorbing particles as described above.
  • the sound generating device includes earphones, earpieces, speakers, speakers, and so on.
  • Sound-generating devices usually use sound-absorbing materials to reduce the resonance frequency, and the sound-absorbing materials are mostly composed of activated carbon particles filled in the back cavity of the sound device.
  • the microcrystalline molecules contained in the activated carbon sound-absorbing particles are stacked in a random and disordered form, and the shape and size of each microcrystalline are different. Therefore, the activated carbon sound-absorbing particles have developed well-developed pore structures, such as mesopores and micropores. These pore structures determine the adsorption performance of the activated carbon sound-absorbing particles. Among them, micropores are used to store gas, and mesopores are gas transmission channels.
  • the size of the micropores and mesopores is related to the accumulated pore volume, bulk density, specific surface area and other parameters of the activated carbon sound-absorbing particles.
  • the vibrating assembly divides the containing cavity into a front acoustic cavity and a rear acoustic cavity, the front acoustic cavity is communicated with the sound hole on the housing, and the rear acoustic cavity is basically a closed space.
  • the activated carbon sound-absorbing particles may be arranged in the rear acoustic cavity.
  • the present invention does not limit the placement of activated carbon sound-absorbing particles in the front acoustic cavity to adjust the sound and airflow of the front acoustic cavity.
  • the present invention discloses activated carbon sound-absorbing particles and a sound generating device through the above technical scheme.
  • the activated carbon sound-absorbing particles are made by mixing activated carbon particles modified with iron oxide and a polymer binder; the activated carbon particles modified with iron oxide It includes activated carbon particles and an iron oxide modified layer; the iron oxide modified activated carbon particles account for 0.5-10 wt% of iron oxide; the iron oxide modified activated carbon particles have a loose pore structure, and the pore structure includes nanoscale
  • the particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns; the particle size of the iron oxide modified activated carbon particles is in the range of 0.1-100 microns.

Abstract

Activated carbon sound-absorbing granules and a sound-producing device. The activated carbon sound-absorbing granules are prepared by mixing iron oxide-modified activated carbon granules with a polymer binder, the particle size of the activated carbon sound-absorbing granules ranging from 50 microns to 1000 microns, the iron oxide-modified activated carbon granules each comprising an activated carbon granule and an iron oxide modification layer and having a loose pore structure, the proportion of iron oxide being 0.5-10 wt%, the pore structure comprising nano-scale micropores and mesopores, the particle size of the iron oxide-modified activated carbon granules ranging from 0.1 microns to 100 microns; an accommodating cavity is formed in a housing of the sound-producing device, and the activated carbon sound-absorbing granules are provided in the accommodating cavity. The modification of iron oxide on the activated carbon granules achieves the effects of reducing the water absorption rate and the resonant frequency of the sound-producing device.

Description

活性炭吸音颗粒以及发声装置Activated carbon sound-absorbing particles and sound generating device 技术领域Technical field
本发明涉及声学技术领域，尤其涉及一种活性炭吸音颗粒以及发声装置。The present invention relates to the technical field of acoustics, in particular to an activated carbon sound-absorbing particle and a sound generating device.
背景技术Background technique
发声装置是电子产品中重要的声学器件，其用于将电信号转换成声音信号。发声装置的谐振频率是重要的声学性能指标，降低发声装置的谐振频率有助于提高发声装置的声学效果。The sound generating device is an important acoustic device in electronic products, which is used to convert electrical signals into sound signals. The resonant frequency of the sound emitting device is an important acoustic performance index, and reducing the resonant frequency of the sound emitting device helps to improve the acoustic effect of the sound emitting device.
并且当前很多吸音材料的吸水性难以得到有效的改善，如何降低吸水性是当前研究的重要课题之一。Moreover, it is difficult to effectively improve the water absorption of many sound-absorbing materials at present, and how to reduce the water absorption is one of the important topics of current research.
发明内容Summary of the invention
本发明提供一种活性炭吸音颗粒以及发声装置，旨在降低活性炭吸音颗粒的吸水性，并降低发声装置的谐振频率。The invention provides an activated carbon sound-absorbing particles and a sound generating device, aiming at reducing the water absorption of the activated carbon sound-absorbing particles and reducing the resonance frequency of the sound generating device.
为实现上述目的，本发明提供一种活性炭吸音颗粒，所述活性炭吸音颗粒由氧化铁修饰的活性炭粒子和高分子聚合物粘接剂混合制成；其中，In order to achieve the above-mentioned object, the present invention provides an activated carbon sound-absorbing particle, the activated carbon sound-absorbing particle is made by mixing activated carbon particles modified with iron oxide and a high molecular polymer binder; wherein,
所述氧化铁修饰的活性炭粒子包括活性炭粒子和氧化铁修饰层；The activated carbon particles modified by iron oxide include activated carbon particles and an iron oxide modified layer;
所述氧化铁修饰的活性炭粒子中氧化铁的占比为0.5-10wt％；The proportion of iron oxide in the activated carbon particles modified with iron oxide is 0.5-10 wt%;
所述氧化铁修饰的活性炭粒子具有疏松的孔道结构，所述孔道结构包括纳米级的微孔和介孔；The iron oxide modified activated carbon particles have a loose pore structure, and the pore structure includes nano-scale micropores and mesopores;
所述活性炭吸音颗粒的粒径范围为50-1000微米；The particle size range of the activated carbon sound-absorbing particles is 50-1000 microns;
所述氧化铁修饰的活性炭粒子的粒径范围为0.1-100微米。The particle size of the iron oxide modified activated carbon particles ranges from 0.1 to 100 microns.
优选地，所述活性炭吸音颗粒含有二维石墨和/或三维石墨微晶，所述活性炭粒子是由二维石墨层结构和/或三维石墨微晶的分子碎片无规则堆积形成的乱层结构。Preferably, the activated carbon sound-absorbing particles contain two-dimensional graphite and/or three-dimensional graphite crystallites, and the activated carbon particles are a chaotic layer structure formed by random accumulation of molecular fragments of the two-dimensional graphite layer structure and/or three-dimensional graphite crystallites.
优选地，所述氧化铁修饰层位于所述活性炭粒子的外表面和孔道内表面，所述氧化铁修饰的活性炭粒子的吸水率小于7％。Preferably, the iron oxide modified layer is located on the outer surface of the activated carbon particles and the inner surface of the pores, and the water absorption rate of the iron oxide modified activated carbon particles is less than 7%.
优选地，所述氧化铁修饰的活性炭粒子中氧化铁的占比为2-6wt％；所述氧化铁修饰的活性炭粒子中所述活性炭粒子占比为90-99.5wt％。Preferably, the proportion of iron oxide in the activated carbon particles modified with iron oxide is 2-6 wt%; the proportion of the activated carbon particles in the activated carbon particles modified with iron oxide is 90-99.5 wt%.
优选地，所述微孔的孔径范围为0.5-2纳米，所述介孔的孔径范围为2-3.5纳米。Preferably, the pore diameter of the micropore is in the range of 0.5-2 nanometers, and the pore diameter of the mesopore is in the range of 2-3.5 nanometers.
优选地，所述氧化铁修饰的活性炭粒子的累积孔容积范围为0.55-0.9g/cm 3。 Preferably, the cumulative pore volume of the activated carbon particles modified with iron oxide ranges from 0.55 to 0.9 g/cm 3 .
优选地，所述氧化铁修饰的活性炭粒子的堆积密度为0.05-1g/cm 3。 Preferably, the bulk density of the activated carbon particles modified with iron oxide is 0.05-1 g/cm 3 .
优选地，所述活性炭吸音颗粒的粒径范围为100-450微米，所述氧化铁修饰的活性炭粒子的粒径范围为0.2-20微米。Preferably, the particle size of the activated carbon sound-absorbing particles is in the range of 100-450 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.2-20 microns.
优选地，所述高分子聚合粘接剂包括聚丙烯酸类、聚乙烯醇类、聚苯乙烯类、聚氨酯类、聚醋酸乙烯酯类、聚丁二橡胶类粘接剂中的一种或多种；Preferably, the polymer adhesive includes one or more of polyacrylic, polyvinyl alcohol, polystyrene, polyurethane, polyvinyl acetate, and polybutadiene rubber adhesives. ；
所述高分子聚合粘接剂在所述活性炭吸音颗粒中的占比范围为1-10wt％。The proportion of the polymer adhesive in the activated carbon sound-absorbing particles ranges from 1 to 10% by weight.
此外，为实现上述目的，本发明还提供一种发声装置，包括In addition, in order to achieve the above object, the present invention also provides a sound generating device, including
壳体，所述壳体中形成有容纳腔；A housing in which a containing cavity is formed;
振动组件，所述振动组件设置在所述壳体中；A vibration component, the vibration component is arranged in the housing;
所述容纳腔中设置有如上所述的活性炭吸音颗粒。The accommodating cavity is provided with activated carbon sound-absorbing particles as described above.
相比现有技术，本发明提供一种活性炭吸音颗粒以及发声装置，所述活性炭吸音颗粒由氧化铁修饰的活性炭粒子和高分子聚合物粘接剂混合制成；所述氧化铁修饰的活性炭粒子包括活性炭粒子和氧化铁修饰层；所述氧化铁修饰的活性炭粒子中氧化铁的占比为0.5-10％；所述氧化铁修饰的活性炭粒子 具有疏松的孔道结构，所述孔道结构包括纳米级的微孔和介孔；所述活性炭吸音颗粒的粒径范围为50-1000微米；所述氧化铁修饰的活性炭粒子的粒径范围为0.1-100微米。由此，通过在活性炭粒子上修饰氧化铁，达到了降低吸水率以及降低发声装置谐振频率的效果。Compared with the prior art, the present invention provides activated carbon sound-absorbing particles and a sound generating device. The activated carbon sound-absorbing particles are made of a mixture of iron oxide-modified activated carbon particles and a polymer binder; the iron oxide-modified activated carbon particles It includes activated carbon particles and an iron oxide modified layer; the iron oxide modified activated carbon particles account for 0.5-10% of iron oxide; the iron oxide modified activated carbon particles have a loose pore structure, and the pore structure includes nanoscale The particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns; the particle size of the iron oxide modified activated carbon particles is in the range of 0.1-100 microns. Thus, by modifying the activated carbon particles with iron oxide, the effect of reducing the water absorption rate and reducing the resonance frequency of the sound generator is achieved.
附图说明Description of the drawings
图1是本发明提供的吸音颗粒的氧化铁含量与吸水率的曲线图；Figure 1 is a graph of iron oxide content and water absorption of sound-absorbing particles provided by the present invention;
图2是本发明提供的吸音颗粒的氧化铁含量与累积孔容积的曲线图；Figure 2 is a graph of iron oxide content and cumulative pore volume of sound-absorbing particles provided by the present invention;
图3是本发明提供的吸音颗粒的氧化铁含量与谐振频率降低效果的曲线图。Fig. 3 is a graph of the iron oxide content and the resonance frequency reduction effect of the sound-absorbing particles provided by the present invention.
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。The realization of the objectives, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.
具体实施方式Detailed ways
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。It should be understood that the specific embodiments described here are only used to explain the present invention, but not used to limit the present invention.
相比现有技术，本发明实施例提出的一种活性炭吸音颗粒。Compared with the prior art, the embodiment of the present invention proposes an activated carbon sound-absorbing particle.
将活性炭吸音颗粒放入发声装置的箱体中，其通过对空气的吸附释放作用，能够等效于扩大箱体的容积，使腔室的容积扩大a倍，a大于1。Putting the activated carbon sound-absorbing particles into the box of the sound device, through the adsorption and release of air, can be equivalent to expanding the volume of the box, increasing the volume of the chamber by a times, and a is greater than 1.
将发声装置单元的谐振频率f 0表示为： Denote the resonance frequency f 0 of the sounding device unit as:
Figure PCTCN2020134629-appb-000001
Figure PCTCN2020134629-appb-000001
其中，M ms是发声装置单元的质量，C ms是发声装置单元的等效声顺性。 Among them, M ms is the quality of the sounding device unit, and C ms is the equivalent sound compliance of the sounding device unit.
在将发声装置单元装配于发声装置的箱体中后，将发声装置的谐振频率f 01表示为： After the sounding device unit is assembled in the box of the sounding device, the resonance frequency f 01 of the sounding device is expressed as:
Figure PCTCN2020134629-appb-000002
Figure PCTCN2020134629-appb-000002
其中，C ma是发声装置的箱体容积的空气声顺性。 Among them, C ma is the air-acoustic compliance of the cabinet volume of the sound generating device.
而在将活性炭吸音颗粒放入发声装置的箱体中后，将发声装置的谐振频率f 02表示为： After putting the activated carbon sound-absorbing particles into the box of the sounding device, the resonance frequency f 02 of the sounding device is expressed as:
Figure PCTCN2020134629-appb-000003
Figure PCTCN2020134629-appb-000003
如上所述，箱体的容积被活性炭吸音材料等效扩大了a倍(a>1)，可见f 02小于f 01。 As mentioned above, the volume of the box is equivalently enlarged by a times (a>1) by the activated carbon sound-absorbing material, and it can be seen that f 02 is smaller than f 01 .
在发声装置的箱体中，粒子的受迫振动会消耗掉声波的能量，这种效果等效于箱体的容积中的空气声顺性增加，从而降低了谐振频率f 02。 In the box of the sound device, the forced vibration of the particles will consume the energy of the sound wave. This effect is equivalent to an increase in the acoustic compliance of the air in the volume of the box, thereby reducing the resonance frequency f 02 .
本发明提供的活性炭吸音颗粒可以用于耳机、听筒、扬声器、音箱等发声装置中。例如，将活性炭吸音材料放入发声装置的后声腔中，虚拟扩大后声腔的体积，从而降低发声装置的谐振频率。进而达到改善发声装置的声学性能的效果。The activated carbon sound-absorbing particles provided by the present invention can be used in sound generating devices such as earphones, earpieces, speakers, sound boxes and the like. For example, the activated carbon sound-absorbing material is put into the rear acoustic cavity of the sound generating device to virtually expand the volume of the rear acoustic cavity, thereby reducing the resonance frequency of the sound generating device. In turn, the effect of improving the acoustic performance of the sound generating device is achieved.
本实施例中，所述活性炭吸音颗粒由氧化铁修饰的活性炭粒子和高分子聚合物粘接剂混合制成；其中，In this embodiment, the activated carbon sound-absorbing particles are made by mixing activated carbon particles modified with iron oxide and a high molecular polymer binder; wherein,
所述氧化铁修饰的活性炭粒子包括活性炭粒子和氧化铁修饰层；The activated carbon particles modified by iron oxide include activated carbon particles and an iron oxide modified layer;
所述活性炭粒子主要由碳、氢、氧三种元素组成。所述氧化铁的分子式是Fe 2O 3。所述氧化铁修饰层位于所述活性炭粒子的表面，其中所述活性炭粒子的表面包括外表面和孔道内表面。 The activated carbon particles are mainly composed of three elements: carbon, hydrogen and oxygen. The molecular formula of the iron oxide is Fe 2 O 3 . The iron oxide modified layer is located on the surface of the activated carbon particles, wherein the surface of the activated carbon particles includes the outer surface and the inner surface of the pores.
所述氧化铁修饰的活性炭粒子中氧化铁的占比为0.5-10wt％；所述活性炭粒子占比为90-99.5wt％。在一实施例中，所述氧化铁的占比可以是0.5wt％、1wt％、2wt％、4wt％、5wt％、8wt％、10wt％；对应的活性炭粒子占比为99.5wt％、99wt％、98wt％、96wt％、95wt％、92wt％、90wt％。The proportion of iron oxide in the activated carbon particles modified by iron oxide is 0.5-10 wt%; the proportion of the activated carbon particles is 90-99.5 wt%. In an embodiment, the proportion of the iron oxide may be 0.5wt%, 1wt%, 2wt%, 4wt%, 5wt%, 8wt%, 10wt%; the corresponding activated carbon particles account for 99.5wt%, 99wt% , 98wt%, 96wt%, 95wt%, 92wt%, 90wt%.
在一实施例中，当所述氧化铁的占比为2-6wt％时，能达到较好的吸水性。具体地，参照图1，图1是本发明提供的吸音颗粒的氧化铁含量与吸水率的曲线图。在图1中，横坐标表示氧化铁的含量，纵坐标表示吸水率，第一含量是指氧化铁含量为0.5-1wt％，第二含量是指氧化铁含量为1-2wt％，第三含量是指氧化铁含量为2-4wt％，第四含量是指氧化铁含量为5-8wt％，第五含量是指氧化铁含量为8-10wt％，如图所示，当氧化铁含量为第一含量0.5-1wt％时，吸水率为33.4％；当氧化铁含量为第二含量2-2wt％时，吸水率为19.3％；当氧化铁含量为第三含量2-4wt％时，吸水率为6.8％；当氧化铁含量为第四含量5-8wt％时，吸水率为7.2％；当氧化铁含量为第五含量8-10wt％时，吸水率为9.3％，由此可知，当所述氧化铁的含量为2-10％时，吸水率小 于10％，当所述氧化铁的含量为2-4％时，吸水率小于7％。当所述氧化铁含量为2-8％时，能获得良好的吸水率。由此可知，所述氧化铁修饰的活性炭粒子能显著地降低吸水率。In one embodiment, when the proportion of the iron oxide is 2-6 wt%, better water absorption can be achieved. Specifically, referring to Fig. 1, Fig. 1 is a graph of the iron oxide content and the water absorption rate of the sound-absorbing particles provided by the present invention. In Figure 1, the abscissa represents the content of iron oxide, the ordinate represents the water absorption, the first content refers to the iron oxide content of 0.5-1wt%, the second content refers to the iron oxide content of 1-2wt%, and the third content It means that the iron oxide content is 2-4wt%, the fourth content refers to the iron oxide content of 5-8wt%, and the fifth content refers to the iron oxide content of 8-10wt%. As shown in the figure, when the iron oxide content is the first When the first content is 0.5-1wt%, the water absorption rate is 33.4%; when the iron oxide content is the second content 2-2wt%, the water absorption rate is 19.3%; when the iron oxide content is the third content 2-4wt%, the water absorption rate When the iron oxide content is the fourth content 5-8wt%, the water absorption rate is 7.2%; when the iron oxide content is the fifth content 8-10wt%, the water absorption rate is 9.3%. When the content of the iron oxide is 2-10%, the water absorption is less than 10%, and when the content of the iron oxide is 2-4%, the water absorption is less than 7%. When the iron oxide content is 2-8%, good water absorption can be obtained. It can be seen that the activated carbon particles modified with iron oxide can significantly reduce water absorption.
所述活性炭吸音颗粒的粒径范围为100-450微米，所述氧化铁修饰的活性炭粒子的粒径范围为0.2-20微米。The particle size of the activated carbon sound-absorbing particles is in the range of 100-450 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.2-20 microns.
所述活性炭吸音颗粒含有二维石墨和/或三维石墨微晶，所述活性炭粒子是由二维石墨层结构和/或三维石墨微晶的分子碎片无规则堆积形成的乱层结构。所述乱层结构在所述活性炭吸音颗粒中的含量越多，所述活性炭吸音颗粒经过碳化工艺的加工工序后，形成的孔道结构越均匀、孔道结构的孔径越小，进而使得所述活性炭吸音颗粒能够产生良好的降低谐振频率的效果。The activated carbon sound-absorbing particles contain two-dimensional graphite and/or three-dimensional graphite microcrystals, and the activated carbon particles are a chaotic layer structure formed by random accumulation of molecular fragments of a two-dimensional graphite layer structure and/or three-dimensional graphite microcrystals. The more the content of the chaotic layer structure in the activated carbon sound-absorbing particles, the more uniform the pore structure and the smaller the pore size of the pore structure after the activated carbon sound-absorbing particles are processed through the carbonization process, thereby making the activated carbon sound-absorbing The particles can produce a good effect of reducing the resonance frequency.
所述二维石墨层结构和所述三维石墨微晶的边缘上存在大量不规则的键。不规则的键能够在二维石墨层结构和三维石墨微晶之间形成紧密连接，交织形成孔道结构。碳的价电子具有sp 2杂化轨道和sp 3杂化轨道，进而形成六角碳网平面。以这种无规则的形式堆积形成的活性炭粒子能够形成细密的、丰富的孔道结构，以满足活性炭吸音颗粒对孔道结构的结构要求。There are a large number of irregular bonds on the edges of the two-dimensional graphite layer structure and the three-dimensional graphite crystallites. Irregular bonds can form tight connections between the two-dimensional graphite layer structure and the three-dimensional graphite crystallites, and interweave to form a pore structure. The valence electrons of carbon have sp 2 hybrid orbitals and sp 3 hybrid orbitals, which form a hexagonal carbon network plane. The activated carbon particles accumulated in this random form can form a fine and abundant pore structure to meet the structural requirements of the activated carbon sound-absorbing particles for the pore structure.
所述二维石墨层结构和三维石墨微晶的粒径小于30纳米。若二维石墨层结构和三维石墨微晶的粒径在上述范围内，无规则堆积后能够更好的形成均匀、细密的孔道结构。一方面更有利于活性炭吸音材料发挥吸收、释放空气的性能。另一方面，能够提高活性炭粒子孔道结构的均一性和稳定性，提高活性炭吸音材料所制成的产品的结构强度。The particle size of the two-dimensional graphite layer structure and the three-dimensional graphite crystallites is less than 30 nanometers. If the particle size of the two-dimensional graphite layer structure and the three-dimensional graphite crystallites are within the above range, a uniform and fine pore structure can be better formed after random stacking. On the one hand, it is more conducive to the performance of activated carbon sound-absorbing materials to absorb and release air. On the other hand, the uniformity and stability of the pore structure of activated carbon particles can be improved, and the structural strength of products made of activated carbon sound-absorbing materials can be improved.
可选地，所述氧化铁修饰的活性炭粒子自身可以呈球形、类球形、片形、棒形结构中的一种或多种。例如，采用球形的碳粒子在粘接形成活性炭吸音颗粒后，碳粒子之间能够形成更均匀、更细密的孔道结构，进而提高活性炭吸音颗粒的声学性能。采用片形氧化铁修饰的活性炭粒子能够提高活性炭吸音颗粒的结构稳定性，降低起粉、破损的风险。同时由于片形氧化铁修饰的活性炭粒子碳化工艺简便，成本较低，因此从工业应用角度优选片形氧化铁修饰的活性炭粒子。Optionally, the iron oxide-modified activated carbon particles themselves may have one or more of spherical, quasi-spherical, flake-shaped, and rod-shaped structures. For example, after spherical carbon particles are bonded to form activated carbon sound-absorbing particles, a more uniform and finer pore structure can be formed between the carbon particles, thereby improving the acoustic performance of the activated carbon sound-absorbing particles. The activated carbon particles modified with flake-shaped iron oxide can improve the structural stability of the activated carbon sound-absorbing particles and reduce the risk of powdering and damage. At the same time, since the carbonization process of the flaky iron oxide modified activated carbon particles is simple and the cost is low, the flaky iron oxide modified activated carbon particles are preferred from the perspective of industrial application.
所述氧化铁修饰的活性炭粒子具有疏松的孔道结构，所述孔道结构包括纳米级的微孔和介孔；所述微孔的孔径范围为0.5-2纳米，所述介孔的孔径范围为2-3.5纳米。The iron oxide modified activated carbon particles have a loose pore structure, the pore structure includes nano-scale micropores and mesopores; the pore diameter range of the micropores is 0.5-2 nanometers, and the pore diameter range of the mesopores is 2 -3.5 nm.
对于所述孔道结构，所述微孔主要用于吸收、容纳空气分子，而介孔除了能够容纳空气分子，还起到了能够让空气分子快速进出于微孔的作用，从而使得活性炭吸音材料具有良好的气压变化响应能力。For the pore structure, the micropores are mainly used to absorb and contain air molecules, while the mesopores can not only contain air molecules, but also play a role in allowing air molecules to enter and exit the micropores quickly, so that the activated carbon sound-absorbing material has a good The ability to respond to changes in air pressure.
所述活性炭吸音颗粒的粒径范围为50-1000微米；活性炭吸音颗粒自身的粒径对颗粒的堆积密度、粘接剂含量等因素会产生影响，进而影响到降低谐振频率的效果。The particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns; the particle size of the activated carbon sound-absorbing particles will affect the bulk density of the particles, the binder content and other factors, thereby affecting the effect of reducing the resonance frequency.
若活性炭吸音颗粒的粒径小于50微米时，活性炭吸音颗粒自身的强度相对下降。将其应用于发声装置的箱体中后，空气的振动、气压的变化变得更容易引起活性炭吸音颗粒起粉、破碎。这种问题会严重影响颗粒降低谐振频率的效果，而且有可能对发声装置的可靠性造成影响。If the particle size of the activated carbon sound-absorbing particles is less than 50 microns, the strength of the activated carbon sound-absorbing particles is relatively reduced. After it is applied to the box of the sound device, the vibration of the air and the change of the air pressure become more likely to cause the activated carbon sound-absorbing particles to powder and break. This problem will seriously affect the effect of particles in reducing the resonance frequency, and may affect the reliability of the sound generating device.
而如果活性炭吸音颗粒的粒径大于1000微米时，颗粒的体积相对较大，颗粒与颗粒之间的间隙明显增大。将这种活性炭吸音颗粒放置于发声装置的箱体中时，颗粒的堆积密度明显降低。相应地，在箱体的单位体积内，能够填充的活性炭吸音颗粒的量相对下降。因此，能够产生虚拟扩容效果的物质减少，降低谐振频率的效果被削弱。If the particle size of the activated carbon sound-absorbing particles is greater than 1000 microns, the volume of the particles is relatively large, and the gap between the particles increases significantly. When the activated carbon sound-absorbing particles are placed in the box of the sound device, the bulk density of the particles is significantly reduced. Correspondingly, in the unit volume of the box, the amount of activated carbon sound-absorbing particles that can be filled is relatively reduced. Therefore, the material that can produce the virtual expansion effect is reduced, and the effect of reducing the resonance frequency is weakened.
本实施例中，活性炭吸音颗粒自身的粒径范围是50-1000微米，能够达到降低谐振频率的性能要求。当活性炭吸音颗粒自身的粒径范围为100-450微米之间时，能够达到最佳的堆积密度，降低谐振频率的效果也最好。例如粒径为100、200或250微米。当活性炭吸音颗粒的粒径范围在100-450微米之间时，降低谐振频率的效果能达到最优水平。所述活性炭吸音颗粒的粒径范围与活性炭粒子的粒径范围可以配合设计。例如，活性炭吸音颗粒的粒径范围为50-1000微米，所述氧化铁修饰的活性炭粒子的粒径范围为0.1-100微米。优选地，所述活性炭吸音颗粒的粒径范围为100-450微米，所述氧化铁修饰的活性炭粒子的粒径范围为0.2-20微米。由此，通过对粒径的控制，能够达到最佳的堆积密度，并具有降低谐振频率的效果。In this embodiment, the particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns, which can meet the performance requirement of reducing the resonance frequency. When the particle size of the activated carbon sound-absorbing particles is between 100-450 microns, the best packing density can be achieved, and the effect of reducing the resonance frequency is the best. For example, the particle size is 100, 200, or 250 microns. When the particle size range of activated carbon sound-absorbing particles is between 100-450 microns, the effect of reducing the resonance frequency can reach the optimal level. The particle size range of the activated carbon sound-absorbing particles and the particle size range of the activated carbon particles can be designed in coordination. For example, the particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.1-100 microns. Preferably, the particle size of the activated carbon sound-absorbing particles is in the range of 100-450 microns, and the particle size of the iron oxide modified activated carbon particles is in the range of 0.2-20 microns. Therefore, by controlling the particle size, the optimum packing density can be achieved, and the resonance frequency can be reduced.
所述氧化铁修饰的活性炭粒子的粒径范围为0.1-100微米。氧化铁修饰的活性炭粒子的粒径会影响到其自身的堆积密度，堆积密度的大小则会影响到吸收空气的性能的发挥。The particle size of the iron oxide modified activated carbon particles ranges from 0.1 to 100 microns. The particle size of the iron oxide modified activated carbon particles will affect its own bulk density, and the size of the bulk density will affect the performance of air absorption.
如果所述氧化铁修饰的活性炭粒子的粒径过小，则会造成堆积密度明显增大。在一定的体积下，所能填充的所述氧化铁修饰的活性炭粒子的质量减 小，则降低谐振频率的性能也会减弱。而如果所述氧化铁修饰的活性炭粒子的粒径过大，则会造成堆积密度明显降低。在一定的体积下，过大的堆积密度会导致空间中的粒子受迫振动时消耗的声波的能量减少，等效于发声装置的箱体容积中空气声顺性(C ma)减小，也会造成降低谐振频率的性能减弱。If the particle size of the iron oxide modified activated carbon particles is too small, the bulk density will increase significantly. Under a certain volume, the mass of the iron oxide modified activated carbon particles that can be filled decreases, and the performance of reducing the resonance frequency is also weakened. If the particle size of the iron oxide modified activated carbon particles is too large, the bulk density will be significantly reduced. Under a certain volume, an excessively large packing density will reduce the energy of the sound waves consumed when the particles in the space are forced to vibrate, which is equivalent to the reduction of the air acoustic compliance (C ma) in the volume of the sounder's cabinet. Will cause the performance of reducing the resonance frequency to be weakened.
所述氧化铁修饰的活性炭粒子的堆积密度为0.05-1g/cm 3。堆积密度的大小还可以通过氧化铁修饰的活性炭粒子的形状、碳含量等因素进行调节。 The bulk density of the activated carbon particles modified with iron oxide is 0.05-1 g/cm 3 . The bulk density can also be adjusted by factors such as the shape and carbon content of the activated carbon particles modified by iron oxide.
所述氧化铁修饰的活性炭粒子的累积孔容积范围为0.55-0.9g/cm 3。在这一范围内，活性炭吸音颗粒能够起到良好的声学性能，并且不会出现结构可靠性降低、氧化铁修饰的活性炭粒子含量降低等问题。若累积孔容积小于0.55，则所述氧化铁修饰的活性炭粒子对空气分子的吸附、脱附能力交底。较低的孔容积会导致空气分子无法顺畅的进出所述活性炭吸音颗粒，所述活性炭吸音颗粒也无法吸收大量的空气分子。当累积孔容积达到一定值后，介孔的含量上升，使得颗粒满足了使空气分子快速进出的需要，对空气分子的吸附、脱附相应速度也会明显提升，进而提升了发声装置箱体的等效扩容倍率。当累积孔容积升高后，微孔的含量也相应上升，对应的所述吸音颗粒吸附空气分子的量也上升，由此，能够有效地降低谐振频率。 The cumulative pore volume of the activated carbon particles modified with iron oxide ranges from 0.55 to 0.9 g/cm 3 . Within this range, activated carbon sound-absorbing particles can have good acoustic performance, and there will be no problems such as reduced structural reliability and reduced content of iron oxide modified activated carbon particles. If the cumulative pore volume is less than 0.55, the adsorption and desorption capabilities of the iron oxide modified activated carbon particles for air molecules are revealed. The lower pore volume will cause air molecules to not smoothly enter and exit the activated carbon sound-absorbing particles, and the activated carbon sound-absorbing particles cannot absorb a large number of air molecules. When the cumulative pore volume reaches a certain value, the content of mesopores increases, so that the particles meet the need for rapid in and out of air molecules, and the corresponding speed of adsorption and desorption of air molecules will be significantly increased, thereby improving the sound device cabinet. Equivalent expansion ratio. When the cumulative pore volume increases, the content of micropores increases accordingly, and the amount of air molecules adsorbed by the corresponding sound-absorbing particles also increases, thereby effectively reducing the resonance frequency.
进一步地，所述微孔的累积孔容积与所述介孔的累积孔容积的比值范围为0.05-20。优选地，两者的比值范围为0.1-5，例如，所述比值可为1或2。对于具有相同质量的不同活性炭吸音颗粒，若微孔累积孔容积与介孔累积孔容积的比值越高，则空气分子的吸附、脱附性能越强。这一性能特点主要是由于微孔能够提供更大的体积，利于吸收空气分子，使其对于发声装置的箱体的等效扩容倍率增大，因而降低谐振频率的效果越好。但是，一般地，上述两者的比值不超过20。比值超过20后活性炭吸音颗粒降低谐振频率的效果急剧下降。其原因在于，比值过大则微孔含量过高，活性炭吸音颗粒中大部分的孔道结构的尺寸过小，从而阻碍了空气的对流、阻碍了空气分子在活性炭吸音颗粒中进出。进而影响了声波的传播，其对谐振频率的降低效果急剧减小。Further, the ratio of the cumulative pore volume of the micropores to the cumulative pore volume of the mesopores ranges from 0.05-20. Preferably, the ratio of the two ranges from 0.1 to 5, for example, the ratio can be 1 or 2. For different activated carbon sound-absorbing particles with the same mass, the higher the ratio of the cumulative pore volume of micropores to the cumulative pore volume of mesopores, the stronger the adsorption and desorption performance of air molecules. This performance feature is mainly due to the fact that the micropores can provide a larger volume, which is beneficial to absorb air molecules, so that the equivalent expansion ratio of the sound device cabinet is increased, so the effect of reducing the resonance frequency is better. However, generally, the ratio of the above two does not exceed 20. When the ratio exceeds 20, the effect of the activated carbon sound-absorbing particles in reducing the resonance frequency drops sharply. The reason is that if the ratio is too large, the content of micropores is too high, and the size of most of the pore structures in the activated carbon sound-absorbing particles is too small, which hinders the convection of air and hinders the entry and exit of air molecules in the activated carbon sound-absorbing particles. This further affects the propagation of sound waves, and its effect on reducing the resonance frequency is drastically reduced.
参照图2，图2是本发明提供的吸音颗粒的氧化铁含量与累积孔容积的曲线图。在图1中，横坐标表示氧化铁的含量，纵坐标表示累积孔容积，单位为g/cm 3。其中，第一含量是指氧化铁含量为0.5-1wt％，第二含量是指氧化 铁含量为1-2wt％，第三含量是指氧化铁含量为2-4wt％，第四含量是指氧化铁含量为5-8wt％，第五含量是指氧化铁含量为8-10wt％，如图所示，当氧化铁含量为第一含量0.5-1wt％时，累积孔容积为0.82g/cm 3；当氧化铁含量为第二含量1-2wt％时，累积孔容积为0.79g/cm 3；当氧化铁含量为第三含量2-4wt％时，累积孔容积为0.71g/cm 3；当氧化铁含量为第四含量5-8wt％时，累积孔容积为0.68g/cm 3；当氧化铁含量为第五含量8-10wt％时，累积孔容积为0.55g/cm 3，由此可知，当所述氧化铁的含量为0.5-10wt％时，累积孔容积为均小于1g/cm 3。 Referring to Figure 2, Figure 2 is a graph of the iron oxide content and the cumulative pore volume of the sound-absorbing particles provided by the present invention. In Fig. 1, the abscissa represents the content of iron oxide, and the ordinate represents the cumulative pore volume in g/cm 3 . Among them, the first content refers to the iron oxide content of 0.5-1wt%, the second content refers to the iron oxide content of 1-2wt%, the third content refers to the iron oxide content of 2-4wt%, and the fourth content refers to the oxidation The iron content is 5-8wt%, and the fifth content means that the iron oxide content is 8-10wt%. As shown in the figure, when the iron oxide content is the first content 0.5-1wt%, the cumulative pore volume is 0.82g/cm 3 ; When the iron oxide content is the second content 1-2wt%, the cumulative pore volume is 0.79g/cm 3 ; when the iron oxide content is the third content 2-4wt%, the cumulative pore volume is 0.71g/cm 3 ; When the iron oxide content is the fourth content 5-8wt%, the cumulative pore volume is 0.68g/cm 3 ; when the iron oxide content is the fifth content 8-10wt%, the cumulative pore volume is 0.55g/cm 3 , which shows that When the content of the iron oxide is 0.5-10 wt%, the cumulative pore volume is all less than 1 g/cm 3 .
进一步地，参照图3，图3是本发明提供的吸音颗粒的氧化铁含量与谐振频率降低效果的曲线图。在图3中，横坐标表示氧化铁的含量，纵坐标表示谐振频率降低效果，单位为Hz。其中，第一含量是指氧化铁含量为0.5-1wt％，第二含量是指氧化铁含量为1-2wt％，第三含量是指氧化铁含量为2-4wt％，第四含量是指氧化铁含量为5-8wt％，第五含量是指氧化铁含量为8-10wt％，如图所示，当氧化铁含量为第一含量0.5-1wt％时，谐振频率降低效果是137Hz；当氧化铁含量为第二含量1-2wt％时，谐振频率降低效果是132Hz；当氧化铁含量为第三含量2-4wt％时，谐振频率降低效果是130Hz；当氧化铁含量为第四含量5-8wt％时，谐振频率降低效果是114Hz；当氧化铁含量为第五含量8-10wt％时，谐振频率降低效果是100Hz。由此可知，在氧化铁含量为0.5-10wt％范围内，随着氧化铁含量的升高，谐振频率降低效果越好。Further, referring to Fig. 3, Fig. 3 is a graph of the iron oxide content and the resonance frequency reduction effect of the sound-absorbing particles provided by the present invention. In Figure 3, the abscissa represents the iron oxide content, and the ordinate represents the resonance frequency reduction effect, in Hz. Among them, the first content refers to the iron oxide content of 0.5-1wt%, the second content refers to the iron oxide content of 1-2wt%, the third content refers to the iron oxide content of 2-4wt%, and the fourth content refers to the oxidation The iron content is 5-8wt%, and the fifth content means that the iron oxide content is 8-10wt%. As shown in the figure, when the iron oxide content is 0.5-1wt% of the first content, the resonance frequency reduction effect is 137Hz; When the iron content is the second content 1-2wt%, the resonance frequency reduction effect is 132Hz; when the iron oxide content is the third content 2-4wt%, the resonance frequency reduction effect is 130Hz; when the iron oxide content is the fourth content 5- At 8wt%, the resonance frequency reduction effect is 114Hz; when the iron oxide content is the fifth content 8-10wt%, the resonance frequency reduction effect is 100Hz. It can be seen that within the range of 0.5-10 wt% of iron oxide, as the iron oxide content increases, the resonance frequency reduction effect is better.
本发明实施例还提供了所述高分子聚合物粘接剂的可选类型，所述高分子聚合物粘接剂被配置为在能保证活性炭吸音颗粒的定型、结构稳定性的基础上，尽可能不破坏、阻塞氧化铁修饰的活性炭粒子中的孔道结构。The embodiment of the present invention also provides optional types of the high molecular polymer adhesive, and the high molecular polymer adhesive is configured to ensure the shape and structural stability of the activated carbon sound-absorbing particles. It may not damage or block the pore structure in the activated carbon particles modified by iron oxide.
可选地，所述高分子聚合物粘接剂包括高分子聚合粘接剂包括聚丙烯酸类、聚乙烯醇类、聚苯乙烯类、聚氨酯类、聚醋酸乙烯酯类、聚丁二橡胶类粘接剂中的一种或多种。所述高分子聚合物粘接剂也可以在后续制成活性炭吸音颗粒后再通过脱脂工艺从吸音颗粒中取出，从而留下更丰富的孔道结构。优选地，所述高分子粘接剂在所述活性炭吸音颗粒中的质量占比范围为1-10wt％。如果高分子粘接剂的含量升高，所述氧化铁修饰的活性炭粒子的用量相应减少，则吸收空气的性能会受到影响。而如果高分子粘接剂的含量过 低，制成的活性炭吸音颗粒易出现起粉、破碎等问题，造成结构可靠性降低。Optionally, the high molecular polymer adhesive includes a high molecular polymer adhesive including polyacrylic, polyvinyl alcohol, polystyrene, polyurethane, polyvinyl acetate, and polybutadiene rubber adhesives. One or more of the adhesives. The high molecular polymer adhesive can also be subsequently made into activated carbon sound-absorbing particles and then removed from the sound-absorbing particles through a degreasing process, thereby leaving a richer pore structure. Preferably, the mass ratio of the polymer adhesive in the activated carbon sound-absorbing particles ranges from 1 to 10% by weight. If the content of the polymer binder increases, the amount of the activated carbon particles modified with iron oxide is correspondingly reduced, and the air absorption performance will be affected. If the content of the polymer binder is too low, the activated carbon sound-absorbing particles are prone to problems such as powdering and crushing, resulting in reduced structural reliability.
本发明实施例的活性炭吸音颗粒具有对氮气分子以及其它空气分子的高吸收能力和对应的吸收系数。将本发明实施例提供的活性炭吸音颗粒放入微型扬声器的后声腔中，可以有效的降低微型扬声器的中低频谐振频率。所述活性炭吸音颗粒能够改变被包含在近乎封闭的后声腔中的气体的声顺性。The activated carbon sound-absorbing particles of the embodiment of the present invention have high absorption capacity and corresponding absorption coefficient for nitrogen molecules and other air molecules. Putting the activated carbon sound-absorbing particles provided by the embodiment of the present invention into the rear acoustic cavity of the micro speaker can effectively reduce the mid-low frequency resonance frequency of the micro speaker. The activated carbon sound-absorbing particles can change the acoustic compliance of the gas contained in the almost closed rear acoustic cavity.
本发明实施例提供的所述活性炭吸音颗粒适于调节基本封闭的腔体的谐振频率。活性炭吸音颗粒填入发声装置的箱体，能够等效于增大发声装置的阻尼，从而减小共振强度。进而降低所述发声装置的电阻抗峰值。The activated carbon sound-absorbing particles provided by the embodiment of the present invention are suitable for adjusting the resonance frequency of a substantially closed cavity. The activated carbon sound-absorbing particles are filled into the box of the sound device, which can be equivalent to increasing the damping of the sound device, thereby reducing the resonance intensity. In turn, the electrical impedance peak value of the sound generating device is reduced.
另一方面，本发明实施例提供的活性炭吸音材料对空气分子的吸附、脱附作用能够反复执行，不会因反复吸附脱附空气分子而出现性能降低的现象。所述活性炭吸音材料可以反复长期使用。On the other hand, the activated carbon sound-absorbing material provided by the embodiments of the present invention can repeatedly perform the adsorption and desorption of air molecules, and will not cause performance degradation due to repeated adsorption and desorption of air molecules. The activated carbon sound-absorbing material can be used repeatedly for a long time.
本发明实施例还提供一种发生装置。所述发声装置包括壳体，所述壳体中形成有容纳腔；振动组件，所述振动组件设置在所述壳体中；所述容纳腔中设置有如上所述的活性炭吸音颗粒。The embodiment of the present invention also provides a generating device. The sound generating device includes a housing in which a accommodating cavity is formed; a vibration assembly in which the vibration assembly is arranged in the housing; the accommodating cavity is provided with activated carbon sound-absorbing particles as described above.
一般地，所述发声装置包括耳机、听筒、扬声器、音箱等。发声装置通常采用填装吸音材料来降低谐振频率，吸音材料多由填充在发声装置后腔中的活性炭颗粒构成。活性炭吸音颗粒中含有的微晶分子是以无规则、紊乱的形式堆叠而成，同时各个微晶的形状、大小不同。因而活性炭吸音颗粒上形成了发达的孔道结构，如介孔和微孔，这些孔道结构决定这活性炭吸音颗粒的吸附性能。其中，微孔用于存储气体，介孔是气体传输通道。由于活性炭吸音颗粒的粒径尺寸、碳化温度影响这微孔和介孔的数量、尺寸，而微孔和介孔的尺寸与活性炭吸音颗粒的累积孔容积、堆积密度、比表面积等参数相关。Generally, the sound generating device includes earphones, earpieces, speakers, speakers, and so on. Sound-generating devices usually use sound-absorbing materials to reduce the resonance frequency, and the sound-absorbing materials are mostly composed of activated carbon particles filled in the back cavity of the sound device. The microcrystalline molecules contained in the activated carbon sound-absorbing particles are stacked in a random and disordered form, and the shape and size of each microcrystalline are different. Therefore, the activated carbon sound-absorbing particles have developed well-developed pore structures, such as mesopores and micropores. These pore structures determine the adsorption performance of the activated carbon sound-absorbing particles. Among them, micropores are used to store gas, and mesopores are gas transmission channels. Because the particle size and carbonization temperature of activated carbon sound-absorbing particles affect the number and size of the micropores and mesopores, the size of the micropores and mesopores is related to the accumulated pore volume, bulk density, specific surface area and other parameters of the activated carbon sound-absorbing particles.
所述振动组件将容纳腔分割为前声腔和后声腔，所述前声腔与壳体上的出声孔连通，后声腔则基本成封闭的空间。所述活性炭吸音颗粒可以设置在后声腔中。当然，本发明并不限制将活性炭吸音颗粒放置在前声腔中，以对前声腔的声音和气流进行调节。The vibrating assembly divides the containing cavity into a front acoustic cavity and a rear acoustic cavity, the front acoustic cavity is communicated with the sound hole on the housing, and the rear acoustic cavity is basically a closed space. The activated carbon sound-absorbing particles may be arranged in the rear acoustic cavity. Of course, the present invention does not limit the placement of activated carbon sound-absorbing particles in the front acoustic cavity to adjust the sound and airflow of the front acoustic cavity.
本发明通过上述技术方案，公开了一种活性炭吸音颗粒以及发声装置，所述活性炭吸音颗粒由氧化铁修饰的活性炭粒子和高分子聚合物粘接剂混合 制成；所述氧化铁修饰的活性炭粒子包括活性炭粒子和氧化铁修饰层；所述氧化铁修饰的活性炭粒子中氧化铁的占比为0.5-10wt％；所述氧化铁修饰的活性炭粒子具有疏松的孔道结构，所述孔道结构包括纳米级的微孔和介孔；所述活性炭吸音颗粒的粒径范围为50-1000微米；所述氧化铁修饰的活性炭粒子的粒径范围为0.1-100微米。由此，通过在活性炭粒子上修饰氧化铁，达到了降低吸水率以及降低发声装置谐振频率的效果。The present invention discloses activated carbon sound-absorbing particles and a sound generating device through the above technical scheme. The activated carbon sound-absorbing particles are made by mixing activated carbon particles modified with iron oxide and a polymer binder; the activated carbon particles modified with iron oxide It includes activated carbon particles and an iron oxide modified layer; the iron oxide modified activated carbon particles account for 0.5-10 wt% of iron oxide; the iron oxide modified activated carbon particles have a loose pore structure, and the pore structure includes nanoscale The particle size of the activated carbon sound-absorbing particles is in the range of 50-1000 microns; the particle size of the iron oxide modified activated carbon particles is in the range of 0.1-100 microns. Thus, by modifying the activated carbon particles with iron oxide, the effect of reducing the water absorption rate and reducing the resonance frequency of the sound generator is achieved.
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者系统不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者系统所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者系统中还存在另外的相同要素。It should be noted that in this article, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, It also includes other elements that are not explicitly listed, or elements inherent to the process, method, article, or system. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, article, or system that includes the element.
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。The sequence numbers of the foregoing embodiments of the present invention are only for description, and do not represent the superiority of the embodiments.
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效变换，或直接或间接运用在其它相关的技术领域，均同理包括在本发明的专利保护范围内。The above descriptions are only the preferred embodiments of the present invention, and do not limit the scope of the present invention. Any equivalent changes made using the content of the description and drawings of the present invention, or directly or indirectly applied to other related technical fields, are the same. The rationale is included in the scope of patent protection of the present invention.

Claims (10)

  1. 一种活性炭吸音颗粒，其特征在于，所述活性炭吸音颗粒由氧化铁修饰的活性炭粒子和高分子聚合物粘接剂混合制成；其中，An activated carbon sound-absorbing particles, characterized in that the activated carbon sound-absorbing particles are made by mixing activated carbon particles modified with iron oxide and a high molecular polymer binder; wherein,
    所述氧化铁修饰的活性炭粒子包括活性炭粒子和氧化铁修饰层；The activated carbon particles modified by iron oxide include activated carbon particles and an iron oxide modified layer;
    所述氧化铁修饰的活性炭粒子中氧化铁的占比为0.5-10wt％；The proportion of iron oxide in the activated carbon particles modified with iron oxide is 0.5-10 wt%;
    所述氧化铁修饰的活性炭粒子具有疏松的孔道结构，所述孔道结构包括纳米级的微孔和介孔；The iron oxide modified activated carbon particles have a loose pore structure, and the pore structure includes nano-scale micropores and mesopores;
    所述活性炭吸音颗粒的粒径范围为50-1000微米；The particle size range of the activated carbon sound-absorbing particles is 50-1000 microns;
    所述氧化铁修饰的活性炭粒子的粒径范围为0.1-100微米。The particle size of the iron oxide modified activated carbon particles ranges from 0.1 to 100 microns.
  2. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述活性炭吸音颗粒含有二维石墨和/或三维石墨微晶，所述活性炭粒子是由二维石墨层结构和/或三维石墨微晶的分子碎片无规则堆积形成的乱层结构。The activated carbon sound-absorbing particles according to claim 1, wherein the activated carbon sound-absorbing particles contain two-dimensional graphite and/or three-dimensional graphite crystallites, and the activated carbon particles are composed of a two-dimensional graphite layer structure and/or three-dimensional graphite crystallites. The disordered layer structure formed by the irregular accumulation of molecular fragments.
  3. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述氧化铁修饰层位于所述活性炭粒子的外表面和孔道内表面，所述氧化铁修饰的活性炭粒子的吸水率小于7％。The activated carbon sound-absorbing particles according to claim 1, wherein the iron oxide modified layer is located on the outer surface and the inner surface of the pores of the activated carbon particles, and the water absorption rate of the iron oxide modified activated carbon particles is less than 7%.
  4. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述氧化铁修饰的活性炭粒子中氧化铁的占比为2-8wt％；所述氧化铁修饰的活性炭粒子中所述活性炭粒子占比为90-99.5wt％。The activated carbon sound-absorbing particles according to claim 1, wherein the proportion of iron oxide in the activated carbon particles modified by iron oxide is 2-8wt%; the proportion of the activated carbon particles in the activated carbon particles modified by iron oxide is It is 90-99.5wt%.
  5. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述微孔的孔径范围为0.5-2纳米，所述介孔的孔径范围为2-3.5纳米。The activated carbon sound-absorbing particles according to claim 1, wherein the pore diameter of the micropores is in the range of 0.5-2 nanometers, and the pore diameter of the mesopores is in the range of 2-3.5 nanometers.
  6. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述氧化铁修饰的活性炭粒子的累积孔容积范围为0.55-0.9g/cm 3。 The activated carbon sound-absorbing particles according to claim 1, wherein the cumulative pore volume of the activated carbon particles modified with iron oxide ranges from 0.55 to 0.9 g/cm 3 .
  7. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述氧化铁修 饰的活性炭粒子的堆积密度为0.05-1g/cm 3。 The activated carbon sound-absorbing particles according to claim 1, wherein the bulk density of the activated carbon particles modified with iron oxide is 0.05-1 g/cm 3 .
  8. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述活性炭吸音颗粒的粒径范围为100-450微米，所述氧化铁修饰的活性炭粒子的粒径范围为0.2-20微米。The activated carbon sound-absorbing particles according to claim 1, wherein the particle size of the activated carbon sound-absorbing particles is in the range of 100-450 microns, and the particle size of the iron oxide-modified activated carbon particles is in the range of 0.2-20 microns.
  9. 根据权利要求1所述的活性炭吸音颗粒，其特征在于，所述高分子聚合粘接剂包括聚丙烯酸类、聚乙烯醇类、聚苯乙烯类、聚氨酯类、聚醋酸乙烯酯类、聚丁二橡胶类粘接剂中的一种或多种；The activated carbon sound-absorbing particles according to claim 1, wherein the polymer adhesive includes polyacrylic acid, polyvinyl alcohol, polystyrene, polyurethane, polyvinyl acetate, polybutylene One or more of rubber adhesives;
    所述高分子聚合粘接剂在所述活性炭吸音颗粒中的占比范围为1-10wt％。The proportion of the polymer adhesive in the activated carbon sound-absorbing particles ranges from 1 to 10% by weight.
  10. 一种发声装置，其特征在于，包括A sounding device, characterized in that it comprises
    壳体，所述壳体中形成有容纳腔；A housing in which a containing cavity is formed;
    振动组件，所述振动组件设置在所述壳体中；A vibration component, the vibration component is arranged in the housing;
    所述容纳腔中设置有如权利要求1-9中任意一项所述的活性炭吸音颗粒。The accommodating cavity is provided with the activated carbon sound-absorbing particles according to any one of claims 1-9.
PCT/CN2020/134629 2019-12-09 2020-12-08 Activated carbon sound-absorbing granules and sound-producing device WO2021115280A1 (en)

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