Sound-absorbing particles and preparation method therefor, and related device

Abstract

Sound-absorbing particles and a preparation method therefor, and a related device. The preparation method for the sound-absorbing particles comprises: S1, adding a powdery molecular sieve to water, uniformly stirring same, then adding an adhesive thereto and continuously stirring same until uniform to obtain a precursor slurry; S2, adding the precursor slurry as a dispersed phase into a microfluidic device (100, 200, 300), and dispersing the precursor slurry into emulsion droplets via a continuous phase by means of the microfluidic device (100, 200, 300); S3, extruding the emulsion droplets in a preset shape by adjusting the shape of a rear section (102, 202, 302) of a micro-channel in the microfluidic device (100, 200, 300) to obtain deformed emulsion droplets; S4, performing low-temperature curing on the deformed emulsion droplets by setting the temperature of the rear section (102, 202, 302) of the micro-channel to obtain cured emulsion droplets; and S5, sublimating and drying the cured emulsion droplets to obtain the sound-absorbing particles 4.

Description

Sound-absorbing particles, preparation method thereof and related equipment TECHNICAL FIELD

[0001] The present application relates to the field of acoustics, in particular to a sound-absorbing particle, a preparation method thereof and related equipment. BACKGROUND

[0002] With the continuous popularity of smart phones and Bluetooth earphones and other portable electronic devices, people's requirements for audio quality are also increasing. In order to improve the sound effect of a loudspeaker, one of the common ways is to fill sound-absorbing materials in the back cavity of the loudspeaker to increase the virtual volume of the back cavity, thereby improving the effect of audio quality.

[0003] After the loudspeaker is packaged, the size of the back cavity volume has an influence on the overall resonance frequency, which is that the smaller the cavity is, the higher the resonance frequency is. As a kind of porous structure material, the molecular sieve can continuously adsorb and desorb the air in the cavity when the back cavity vibrates, thereby indirectly achieving the effect of increasing the volume of the cavity.

[0004] Due to the overall size of the portable device, in order to obtain better low-frequency effect of the loudspeaker, on the one hand, it is required that the resonance frequency of the loudspeaker is as low as possible, and on the other hand, it is expected that the back cavity of the loudspeaker is as small as possible to save space, but the frequency reduction performance of the filling material of the back cavity of the loudspeaker in the related technology cannot meet the above requirements.

[0005] Therefore, there is an urgent need for a sound-absorbing particle with higher frequency reduction performance, a preparation method thereof and related equipment to solve the above problems. TECHNICAL PROBLEM

[0006] The purpose of the present application is to provide a sound-absorbing particle, a preparation method thereof and related equipment to solve the problem of low frequency reduction performance of the filling material of the back cavity of the loudspeaker in the related technology. TECHNICAL SOLUTION

[0007] In a first aspect, the present application provides a preparation method of a sound-absorbing particle, comprising the following steps:

[0008] S1, adding a powdered molecular sieve into water and stirring uniformly, and then adding a binder and continuing to stir uniformly to obtain a precursor slurry;

[0009] S2, adding the precursor slurry as a dispersed phase into a microfluidic device, and then dispersing the precursor slurry into emulsion droplets flowing in the front section of the microchannel in the microfluidic device through a continuous phase by the microfluidic device;

[0010] S3, extruding the emulsion droplets to have a preset shape by adjusting the shape of the rear section of the microchannel in the microfluidic device to obtain deformed emulsion droplets with the preset shape;

[0011] S4, low-temperature solidification of the deformed emulsion droplets is performed by setting the temperature of the rear section of the microfluidic channel, and the solidified emulsion droplets are collected;

[0012] S5, sublimation and drying of the solidified emulsion droplets are performed to obtain sound-absorbing particles.

[0013] Preferably, the mass ratio of the molecular sieve, the adhesive and the water is 1:0.02-0.10:0.50-2.

[0014] Preferably, the continuous phase added to the microfluidic device for dispersing the dispersed phase comprises an oil having a freezing point lower than that of the precursor slurry.

[0015] Preferably, the continuous phase further comprises an unsaturated fatty acid or an antifreeze agent to keep the oil in the microfluidic channel of the microfluidic device in a flowable liquid state.

[0016] Preferably, the front section of the microfluidic channel is tubular, and the rear section of the microfluidic channel is in a specific shape for extruding the emulsion droplets into the preset shape.

[0017] Preferably, the maximum cross-sectional area of the emulsion droplets in the front section of the microfluidic channel is greater than that of the rear section of the microfluidic channel.

[0018] Preferably, the specific shape is any one of flat, stepped, circular ring and tubular.

[0019] Preferably, the microfluidic device adopts any one of a stepped microchannel, a T-shaped vertically staggered microchannel and a fluid focusing microchannel.

[0020] Preferably, the temperature of the rear section of the microfluidic channel is higher than the freezing point temperature of the continuous phase and lower than the freezing point temperature of the dispersed phase; and the solidified emulsion droplets are obtained by low-temperature solidification of the deformed emulsion droplets through the rear section of the microfluidic channel.

[0021] Preferably, the molecular sieve has one or more of MFI structure, FER structure and MEL structure; the molecular sieve is composed of silicon oxide and metal element oxide, and the molar ratio between silicon elements in the silicon oxide and metal elements in the metal element oxide is greater than or equal to 100, and the metal elements include one or more of aluminum, iron, zinc and zirconium.

[0022] Preferably, the sound-absorbing particles are any one of spherical, disc-shaped, ellipsoidal and rod-shaped.

[0023] In a second aspect, the present application provides a sound-absorbing particle prepared by the above-mentioned method for preparing sound-absorbing particles.

[0024] In a third aspect, the present application provides a loudspeaker box, which comprises a shell having a receiving space, a sound emitting unit received in the receiving space, and a sound guide channel; the shell comprises an upper cover and a lower cover covering the upper cover, and the sound guide channel is formed in the upper cover; the sound emitting unit and the upper cover and the lower cover jointly form a rear cavity, the sound emitting unit is arranged in a spaced manner with the upper cover and jointly forms a front sound cavity, the sound guide channel communicates the front sound cavity with the outside, and jointly forms a front cavity with the front sound cavity; the rear cavity is filled with sound absorbing particles as described above.

[0025] In a fourth aspect, the present application provides an electronic device provided with the loudspeaker box as described above. Advantages

[0026] Compared with the related art, in the present application, the preparation method of the sound absorbing particles comprises the following steps: adding a powdered molecular sieve into water and stirring uniformly, then adding a binder and continuing to stir uniformly to obtain a precursor slurry; adding the precursor slurry as a dispersed phase into a microfluidic device, and then dispersing the precursor slurry into emulsion droplets flowing in a front section of a microchannel in the microfluidic device through the microfluidic device; extruding the emulsion droplets into deformed emulsion droplets with a preset shape by adjusting the shape of a rear section of the microchannel in the microfluidic device; and obtaining solidified emulsion droplets by sublimation and drying the deformed emulsion droplets. The microfluidic device is used to obtain sound absorbing particles with different shapes, and the sound absorbing particles can improve the frequency reduction performance when applied to the rear cavity of a loudspeaker, thereby improving the acoustic performance of the loudspeaker. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0028] Fig. 1 is a flowchart of a preparation method of sound absorbing particles according to an embodiment of the present application;

[0029] Fig. 2 is a structural diagram of a T-shaped vertical staggered microchannel according to an embodiment of the present application;

[0030] Fig. 3 is a structural diagram of a T-shaped vertical staggered microchannel according to another embodiment of the present application;

[0031] Fig. 4 is a structural diagram of a fluid focusing microchannel according to another embodiment of the present application;

[0032] Fig. 5 is a cross-sectional view of a loudspeaker box according to an embodiment of the present application. Embodiments of the present application

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] Embodiment one

[0035] The embodiment of the present application provides a preparation method of sound-absorbing particles, which comprises the following steps in combination with Fig. 1:

[0036] S1, adding powdered molecular sieve into water and stirring uniformly, then adding adhesive and continuing to stir uniformly to obtain a precursor slurry;

[0037] S2, adding the precursor slurry as a dispersed phase into a microfluidic device, and dispersing the precursor slurry into emulsion droplets flowing in the front section of the microchannel in the microfluidic device through the continuous phase by the microfluidic device;

[0038] S3, extruding the emulsion droplets to have a preset shape by adjusting the shape of the rear section of the microchannel in the microfluidic device to obtain deformed emulsion droplets with a preset shape;

[0039] S4, low-temperature curing the deformed emulsion droplets by setting the temperature of the rear section of the microchannel, and collecting the cured emulsion droplets;

[0040] S5, sublimating and drying the cured emulsion droplets to obtain sound-absorbing particles.

[0041] In order to better reflect the beneficial effects brought by the preparation method of sound-absorbing particles in the embodiments of the present application, three specific embodiments will be explained below.

[0042] Specific embodiment one

[0043] The specific embodiment provides a preparation method of sound-absorbing particles, which comprises the following steps:

[0044] Step one, adding 5g of powdered ZSM-5 molecular sieve with a silicon-aluminum molar ratio of 170 into 5g of deionized water and stirring uniformly, then adding 1g of acrylic adhesive with a solid content of 50% and continuing to stir uniformly to obtain a precursor slurry with a setting temperature of about 0℃.

[0045] Step two, the precursor slurry is added into the dispersed phase reservoir of the microfluidic device as the dispersed phase, and the precursor slurry is dispersed into the emulsion droplets flowing in the front section of the microchannel in the microfluidic device by the microfluidic device.

[0046] The continuous phase is obtained by adding 5 mL of antifreezing agent into 15 mL of microdroplet generation oil and mixing uniformly, and the freezing temperature thereof is about -15℃; the obtained continuous phase is added into the continuous phase reservoir of the microfluidic device 100.

[0047] More specifically, as shown in FIG. 2, the microfluidic device 100 adopts T-type vertically staggered microchannels, and contains channel one 103 and channel two 104 which are T-type vertically staggered, wherein the channel one 103 is T-type connected with the dispersed phase reservoir, the channel two 104 and the front section of the microchannel 101 in the microfluidic device 100 respectively, and the channel two 104 is connected with the continuous phase reservoir and the front section of the microchannel 101 respectively; the flow rates of the channel one 103 and the channel two 104 are set as 15 μL / min and 60 μL / min respectively, the precursor slurry and the continuous phase are simultaneously flowed into the front section of the microchannel 101 by the channel one 103 and the channel two 104 respectively, and the precursor slurry is dispersed into the emulsion droplets flowing in the front section of the microchannel 101 by the continuous phase, wherein the front section of the microchannel 101 is a tubular channel with a diameter of 150 μm.

[0048] Step three, the rear section of the microchannel 102 in the microfluidic device 100 is adjusted to be a flat channel with a height of 100 μm to extrude the emulsion droplets in the height direction, so as to obtain the deformed emulsion droplets in the shape of ellipsoid.

[0049] Since the tube diameter of the front section of the microchannel 101 in the height direction is greater than the tube diameter of the rear section of the microchannel 102 in the height direction, the emulsion droplets will be extruded by the rear section of the microchannel 102 after flowing from the front section of the microchannel 101 to the rear section of the microchannel 102, and the maximum cross-sectional area of the emulsion droplets in the front section of the microchannel 101 is greater than that of the rear section of the microchannel 102, so as to obtain the deformed emulsion droplets in the shape of ellipsoid.

[0050] Step four, the temperature of the rear section of the microchannel 102 is set as -8℃, the deformed emulsion droplets are low-temperature solidified, and the solidified emulsion droplets are collected.

[0051] Step five, the solidified emulsion droplets are placed into a low-pressure vacuum environment until all the ice in the solidified emulsion droplets is removed by sublimation, and then the solidified emulsion droplets are placed into an oven at 120℃ for drying for 2 h, and finally the sound-absorbing particles in the shape of ellipsoid are obtained.

[0052] The embodiment can form ellipsoidal sound-absorbing particles by extruding the milk drops in the height direction by using the flat micro-channel rear section 102, and the path of gas entering the interior of the ellipsoidal sound-absorbing particles is shorter, so that more gas molecules can be adsorbed or desorbed in a short time, thereby having a better sound-absorbing effect.

[0053] Embodiment two

[0054] The embodiment provides a preparation method of sound-absorbing particles, which comprises the following steps:

[0055] Step one, 5 g of powdered ZSM-5 molecular sieve with a silicon-iron molar ratio of 290 is added to 5 g of deionized water and stirred uniformly, and then 1 g of an acrylic adhesive with a solid content of 50% is added and stirred uniformly to obtain a precursor slurry with a setting temperature of about 0℃.

[0056] Step two, the precursor slurry is added as a dispersed phase into a dispersed phase storage pool of a microfluidic device, and the precursor slurry is dispersed into milk drops flowing in a micro-channel front section of the microfluidic device by the microfluidic device.

[0057] The continuous phase is obtained by adding 5 mL of an antifreezing agent to 15 mL of micro-droplet generation oil and mixing uniformly, and has a setting temperature of about -15℃; the obtained continuous phase is added to a continuous phase storage pool of the microfluidic device 200.

[0058] More specifically, as shown in FIG. 3, the microfluidic device 200 adopts a T-shaped vertical staggered micro-channel, and contains a channel one 203 and a channel two 204 which are vertically staggered in a T shape, wherein the channel one 203 is connected in a T shape with the dispersed phase storage pool, the channel two 204 and the micro-channel front section 201 in the microfluidic device 200, respectively, and the channel two 204 is connected with the continuous phase storage pool and the micro-channel front section 201, respectively; the flow rates of the channel one 203 and the channel two 204 are set to 15 μL / min and 60 μL / min, respectively; the precursor slurry and the continuous phase flow into the micro-channel front section 201 simultaneously through the channel one 203 and the channel two 204, respectively, and the precursor slurry is dispersed into milk drops flowing in the micro-channel front section 201 by the continuous phase, wherein the micro-channel front section 201 is a tubular channel with a diameter of 150 μm.

[0059] Step three, the milk drops are extruded by adjusting the micro-channel rear section 202 in the microfluidic device 200 to be a tubular channel with a diameter of 30 μm, so as to obtain rod-shaped deformed milk drops.

[0060] Due to the fact that the pipe diameter of the micro-channel front section 201 is larger than that of the micro-channel rear section 202, the emulsion droplets are extruded by the micro-channel rear section 202 after flowing from the micro-channel front section 201 to the micro-channel rear section 202, and the maximum cross-sectional area of the emulsion droplets in the micro-channel front section 201 is larger than that of the micro-channel rear section 202, so that the deformed emulsion droplets are obtained in the form of rods.

[0061] Step four, the temperature of the micro-channel rear section 202 is set to -8℃, and the deformed emulsion droplets are subjected to low-temperature solidification, and the solidified emulsion droplets are collected.

[0062] Step five, the solidified emulsion droplets are placed in a low-pressure vacuum environment until all the ice in the solidified emulsion droplets is removed by sublimation, and then the solidified emulsion droplets are placed in an oven at 120℃ for drying for 2h, and finally the sound-absorbing particles in the form of rods are obtained.

[0063] The specific embodiment can extrude spherical emulsion droplets into rods by using the tubular micro-channel rear section 202, and form sound-absorbing particles in the form of rods after ice removal and solidification, and the sound-absorbing particles in the form of rods have better looseness when randomly stacked in the rear cavity of a loudspeaker, so that they have better air compliance, and the damping of the loudspeaker can be significantly improved.

[0064] Specific embodiment three

[0065] The specific embodiment provides a preparation method of sound-absorbing particles, which comprises the following steps:

[0066] Step one, 5g of powdered pure silicon MFI structure molecular sieve is added to 5g of deionized water and stirred uniformly, and then 1g of 50% acrylic adhesive with a solid content is added and stirred uniformly to obtain a precursor slurry with a freezing temperature of about 0℃.

[0067] Step two, the precursor slurry is added as a dispersed phase to a fractional phase storage tank of a microfluidic device, and the precursor slurry is dispersed into emulsion droplets flowing in a micro-channel front section of the microfluidic device by the microfluidic device.

[0068] The continuous phase is obtained by adding 5mL of antifreeze to 15mL of microdroplet generation oil and mixing uniformly, and has a freezing temperature of about -15℃; the obtained continuous phase is added to a continuous phase storage tank of the microfluidic device 300.

[0069] In more detail, as shown in Fig. 4, the microfluidic device 300 adopts a fluid focusing microchannel, including a channel one 303 and a channel two 304, the channel one 303 is arranged outside the channel two 304 and meets the channel two 304 at the front end of the microflow front section 301, the channel one 303 is connected with the continuous phase reservoir and the microflow front section 301 in the microfluidic device 300 respectively, and the channel two 304 is connected with the dispersed phase reservoir and the microflow front section 301 respectively; the flow rates of the channel one 303 and the channel two 304 are set to 15 μL / min and 60 μL / min respectively, the continuous phase and the precursor slurry flow into the microflow front section 301 simultaneously through the channel one 303 and the channel two 304 respectively, and the precursor slurry is dispersed into emulsion droplets flowing in the microflow front section 301 by the flow plasticity of the continuous phase.

[0070] Step three, the emulsion droplets are extruded by adjusting the microflow rear section 302 in the microfluidic device 300 into a ring-shaped channel with an outer diameter of 150 μm and an inner diameter of 30 μm, so as to obtain ring-shaped deformed emulsion droplets.

[0071] More specifically, in the embodiment, the channel structure of the microflow front section 301 and the channel structure and specification of the microflow rear section 302 are the same, both are ring-shaped channels with an outer diameter of 150 μm and an inner diameter of 30 μm, and the emulsion droplets are extruded into ring-shaped deformed emulsion droplets by the flow plasticity of the precursor slurry through the continuous phase at the meeting place of the channel one 303 and the channel two 304, i.e. the front end of the microflow front section 301.

[0072] Step four, the temperature of the microflow rear section 302 is set to -8 ℃, the deformed emulsion droplets are low-temperature solidified, and the solidified emulsion droplets are collected.

[0073] Step five, the solidified emulsion droplets are placed in a low-pressure vacuum environment until all the ice in the solidified emulsion droplets is removed by sublimation, then the solidified emulsion droplets are placed in an oven at 120 ℃ for drying for 2 h, and finally ring-shaped sound-absorbing particles are obtained.

[0074] In the embodiment, the dispersed phase and the continuous phase flow into the intermediate channel through multiple liquid inlet microchannels, wherein the liquid inlet channels of the continuous phase are distributed outside the liquid inlet channels of the dispersed phase in a ring shape, so that the ring-shaped sound-absorbing particles can be prepared, and the ring-shaped sound-absorbing particles have good frequency reduction effect and air flow property.

[0075] For the above specific embodiments one, two and three, the size of the sound-absorbing particles selected is in a size range commonly used and having good sound-absorbing effect, and the size and structure of the sound-absorbing particles can be adjusted within a certain size or certain morphology range according to requirements by changing the sample injection speed of the microfluidic device and the pipe size and the like.

[0076] Embodiment two

[0077] The sound-absorbing particles are prepared by the method for preparing the sound-absorbing particles in the above embodiment one.

[0078] The mass ratio of the molecular sieve, the adhesive and the water is 1:0.02-0.20:0.50-2.

[0079] The sound-absorbing particles are in any one of a spherical shape, a disc shape, an oval spherical shape and a rod shape. Of course, according to custom requirements, the sound-absorbing particles can also be in other shapes such as a square shape, a triangular shape or an irregular shape and the like.

[0080] Since the sound-absorbing particles in the embodiment are prepared by the method for preparing the sound-absorbing particles in the above embodiment one, the sound-absorbing particles in the embodiment can also achieve the technical effects achieved by the method for preparing the sound-absorbing particles in the embodiment one, which will not be repeated here.

[0081] Embodiment three

[0082] The loudspeaker box 400 provided by the embodiment of the present application comprises a shell 1 having a receiving space, a sound-emitting unit 2 received and fixed in the receiving space and a sound guide channel 3; the shell 1 comprises an upper cover 11 and a lower cover 12 covering the upper cover 11, and the sound guide channel 3 is formed in the upper cover 11; the sound-emitting unit 2 and the upper cover 11 and the lower cover 12 jointly form a rear cavity 10, the sound-emitting unit 2 is arranged in a spaced-apart manner with the upper cover 11 and jointly forms a front sound cavity 20, the sound guide channel 3 communicates the front sound cavity 20 with the outside and jointly forms a front cavity 30 with the front sound cavity 20; and the rear cavity 10 is filled with sound-absorbing particles 4.

[0083] The sound-absorbing particles 4 in the embodiment are the sound-absorbing particles in the above embodiment two.

[0084] Since the sound-absorbing particles 4 filled in the rear cavity 10 of the loudspeaker box 400 in the embodiment are the sound-absorbing particles in the above embodiment two, the sound-absorbing particles 4 in the embodiment can also achieve the technical effects achieved by the sound-absorbing particles in the embodiment two, which will not be repeated here.

[0085] Embodiment four

[0086] The electronic device provided by the embodiment has the loudspeaker box 400 of the third embodiment.

[0087] The electronic device can be any one of a mobile phone, a watch, a tablet computer, a sound box, a notebook computer, and the like. Of course, according to actual needs, the electronic device can also be a portable game console, a radio, or some other device having a loudspeaker box structure.

[0088] Since the electronic device in the embodiment is provided with the loudspeaker box 400 in the third embodiment, the electronic device in the embodiment can also achieve the technical effects achieved by the loudspeaker box 400 in the third embodiment, which will not be described herein.

[0089] The above merely provides the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, which is made by using the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A method for producing sound-absorbing particles, characterized by, The preparation method of the sound-absorbing particles comprises the following steps: S1, adding powdered molecular sieve into water and stirring until uniform, then adding adhesive and continuing to stir until uniform, to obtain a precursor slurry; S2, adding the precursor slurry as a dispersed phase into a microfluidic device, and then dispersing the precursor slurry into emulsion droplets flowing in the front section of a microchannel in the microfluidic device through a continuous phase; S3, extruding the emulsion droplets into deformed emulsion droplets with a preset shape by adjusting the shape of the rear section of the microchannel in the microfluidic device; S4, low-temperature solidifying the deformed emulsion droplets by setting the temperature of the rear section of the microchannel, and collecting the solidified emulsion droplets; S5, sublimating and drying the solidified emulsion droplets to obtain sound-absorbing particles.

2. The method of claim 1, wherein the sound absorbing particles are prepared by a method comprising: The mass ratio of the molecular sieve, the adhesive, and the water is 1:0.02-0.10:0.50-2.

3. The method of claim 1, wherein the sound absorbing particles are prepared by a method comprising: The continuous phase added into the microfluidic device for dispersing the dispersed phase comprises oil with a freezing point lower than that of the precursor slurry. ​ 4. The method of claim 3, wherein the sound absorbing particles are prepared by a method comprising: The continuous phase further comprises unsaturated fatty acid or antifreeze to keep the oil in the microchannel of the microfluidic device in a flowable liquid state.

5. The method for preparing sound-absorbing particles according to claim 1, characterized in that: The front section of the microchannel is tubular, and the rear section of the microchannel is in a specific shape for extruding the emulsion droplets into the preset shape.

6. The method of claim 5, wherein the sound absorbing particles are prepared by a method comprising: The maximum cross-sectional area of the emulsion droplets in the front section of the microchannel is greater than that of the rear section of the microchannel.

7. The method for preparing sound-absorbing particles according to claim 5, characterized in that: The specific shape is any one of flat, stepped, circular ring, and tubular.

8. The method for preparing sound-absorbing particles according to claim 1, characterized in that: The microfluidic device adopts any one of stepped microchannels, T-shaped vertically staggered microchannels, and fluid focusing microchannels.

9. The method for preparing sound-absorbing particles according to claim 1, characterized in that: The temperature of the rear section of the microchannel is higher than the freezing point temperature of the continuous phase and lower than the freezing point temperature of the dispersed phase; and the solidified emulsion droplets are obtained by low-temperature solidifying the deformed emulsion droplets through the rear section of the microchannel.

10. The method of claim 1, wherein the sound absorbing particles are prepared by a method comprising: The molecular sieve has one or more of MFI structure, FER structure, and MEL structure; the molecular sieve is composed of silicon oxide and metal element oxide, and the molar ratio between silicon elements in the silicon oxide and metal elements in the metal element oxide is greater than or equal to 100, the metal elements including one or more of aluminum, iron, zinc, and zirconium. ​ 11. The method of claim 1, wherein the sound absorbing particles are prepared by a method comprising: The sound-absorbing particles are any one of spherical, disc-shaped, ellipsoidal, and rod-shaped. ​ 12. A sound absorbing particle, characterized by, The sound-absorbing particles are obtained by the preparation method of the sound-absorbing particles according to any one of claims 1-11.

13. A speaker box comprising a housing having a receiving space, a sound emitting unit received in the receiving space, and a sound guide channel; the housing comprises an upper cover and a lower cover covering the upper cover, the sound guide channel is formed in the upper cover; the sound emitting unit and the upper cover and the lower cover jointly form a back cavity, the sound emitting unit is spaced apart from the upper cover and jointly forms a front sound cavity, the sound guide channel communicates the front sound cavity with the outside, and jointly forms a front cavity with the front sound cavity; characterized in that, The sound-absorbing particles according to claim 12 are filled in the rear cavity.

14. An electronic device, comprising: The loudspeaker box according to claim 13 is arranged in the electronic device.

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