A sound-absorbing material, a sound-generating device, and an electronic device

Abstract

This invention discloses a sound-absorbing material, a sound-generating device, and an electronic device, relating to the field of acoustic technology. The disclosed sound-absorbing material comprises a porous organic cage polymer, the molecular chain of which includes an ether bond structural unit as shown in formula (I): -Ar-O-R- (I); wherein Ar is an aromatic group, R is a group containing carbon atoms, and at least one carbon atom in R is directly connected to an oxygen atom in the ether bond structural unit; the porous organic cage polymer has a three-dimensional porous structure formed by the linkage of ether bond structural units and contains micropores of 0.3~1.9 nm; the density of the sound-absorbing material is less than 0.25 g / mL. This invention aims to solve the technical problem of how to ensure acoustic improvement without increasing the filling volume of the sound-absorbing material under limited space in the rear cavity of a loudspeaker, while simultaneously meeting the lightweight design requirements of electronic devices for loudspeakers.

Description

Technical Field

[0001] This invention relates to the field of acoustics, and more particularly to a sound-absorbing material, a sound-generating device, and an electronic device. Background Technology

[0002] With the continuous evolution of consumer electronics, portable devices such as smartphones, tablets, smartwatches, and true wireless stereo headphones are rapidly developing towards smaller size, lighter weight, and thinner bodies, making their internal space increasingly scarce. As a key sound-producing component in these devices, the speaker's rear cavity volume is significantly compressed. This reduction in rear cavity volume directly lowers the speaker's equivalent acoustic compliance, leading to an increase in the resonant frequency (F0), thus degrading low-frequency response performance and negatively impacting the final listening experience. To alleviate these problems, traditional techniques often fill the speaker's rear cavity with sound-absorbing materials, utilizing their adsorption-desorption effect on air molecules to achieve virtual volume expansion, effectively lowering the resonant frequency (F0) and improving low-frequency performance. Currently, the most mature sound-absorbing material is zeolite-based porous particles.

[0003] However, zeolite sound-absorbing materials have a relatively high density, resulting in a larger mass for the same filling volume. This increases the weight of electronic devices, failing to meet the lightweight design requirements. To achieve weight reduction, the amount of sound-absorbing material filled needs to be reduced, which decreases the sound absorption effect and affects the sound quality of the electronic device. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-absorbing material, a sound-generating device, and an electronic device, aiming to solve the technical problem of how to ensure acoustic improvement without increasing the filling volume of the sound-absorbing material under the condition of limited space in the rear cavity of the speaker, while meeting the lightweight design requirements of electronic devices for the speaker.

[0005] To achieve the above objectives, embodiments of the present invention provide a sound-absorbing material, the sound-absorbing material comprising: a porous organic cage polymer, wherein the molecular chain of the porous organic cage polymer includes ether bond structural units as shown in formula (I): -Ar-OR- (I); Wherein, Ar is an aromatic group, R is a group containing carbon atoms, and at least one carbon atom in R is directly connected to an oxygen atom in the ether bond structural unit; the porous organic cage polymer has a three-dimensional porous structure formed by the linkage of the ether bond structural units and contains micropores of 0.3~1.9 nm; the density of the porous organic cage polymer is less than 0.25 g / mL.

[0006] In one embodiment, the porous organic cage polymer has a molecular weight of 5,000 to 1,000,000.

[0007] In one embodiment, the specific surface area of ​​the porous organic cage polymer is greater than 300 m². 2 / g.

[0008] In one embodiment, the porous organic cage polymer further contains a pore structure of 6-100 nm.

[0009] In one embodiment, the porous organic cage polymer is formed in the form of particles with a particle size of 0.1~600 μm.

[0010] In one embodiment, the sound-absorbing material further includes an adhesive for bonding the porous organic cage polymer into sound-absorbing particles in granular and / or sheet form.

[0011] In one embodiment, the particle size of the sound-absorbing particles is 110~1000 μm.

[0012] In one embodiment, the adhesive includes: organic adhesives and / or inorganic adhesives.

[0013] In one embodiment, the adhesive accounts for 2.5 to 20% of the total mass of the sound-absorbing particles.

[0014] To achieve the above objectives, embodiments of the present invention provide a sound-generating device, the sound-generating device comprising a housing and a sound-generating unit disposed within the housing, the housing having an internal space, the sound-generating unit cooperating with the housing to define a front acoustic cavity and a rear acoustic cavity within the internal space, the front acoustic cavity and / or the rear acoustic cavity being filled with the sound-absorbing material as described above.

[0015] To achieve the above objectives, embodiments of the present invention provide an electronic device, which includes the sound-absorbing material as described above, or the sound-generating device as described above.

[0016] This invention provides a sound-absorbing material that incorporates a porous organic cage polymer as its core component. The polymer's molecular chain contains -Ar-OR- ether bond structural units, with the carbon atom in R directly connected to the oxygen atom in the ether bond unit, forming a stable three-dimensional porous structure containing micropores in the range of 0.3–1.9 nm. The sound-absorbing material has a density of less than 0.25 g / mL, significantly reducing its mass compared to traditional zeolite-based sound-absorbing materials under the same volume usage conditions, thus facilitating lightweight applications. Simultaneously, the micropores in the 0.3–1.9 nm range of this material exhibit excellent adsorption and desorption effects on air molecules (such as nitrogen and oxygen), effectively dissipating sound wave energy and thus endowing the material with excellent sound absorption performance, effectively improving the acoustic performance of sound-generating devices. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the sound-generating device involved in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures 1. Sound-absorbing material; 10. Shell; 101. Rear acoustic cavity; 102. Front acoustic cavity; 20. Sound-producing unit.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0021] Hereinafter, embodiments of the sound-absorbing material, sound-generating device, and electronic device of the present invention are disclosed in detail with appropriate reference to the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present invention and are not intended to limit the subject matter of the claims.

[0022] The "range" disclosed in this invention is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for specific parameters, it is understood that ranges of 60~110 and 80~120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this invention, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0023] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0024] Unless otherwise specified, all steps of the present invention may be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the present invention is not limited to the listed embodiments, but should also include any other known modifications within the scope of the claims of the present invention.

[0026] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0027] This invention provides a sound-absorbing material comprising: a porous organic cage polymer, wherein the molecular chain of the porous organic cage polymer includes ether bond structural units as shown in formula (I): -Ar-OR- (I); Wherein, Ar is an aromatic group, R is a group containing carbon atoms, and at least one carbon atom in R is directly connected to an oxygen atom in the ether bond structural unit; the porous organic cage polymer has a three-dimensional porous structure formed by the linkage of ether bond structural units and contains micropores of 0.3~1.9 nm; the density of the porous organic cage polymer is less than 0.25 g / mL.

[0028] In one feasible embodiment, the ether bond structural unit possesses a certain degree of flexibility, which endows the porous organic cage polymer with good molecular chain mobility. This allows for effective dissipation of sound wave energy through the micro-movement of the molecular chains during sound wave propagation, enhancing the material's sound absorption performance. Furthermore, the three-dimensional porous structure formed by -Ar-OR-ether bonds possesses abundant nanoscale channels (e.g., micropores, pore structures). These channels can efficiently adsorb and desorb molecules in the air, improving the sound absorption effect. In addition, this three-dimensional porous structure imparts a low skeletal density to the material, resulting in an overall density of less than 0.25 g / mL for the porous organic cage polymer. Compared to traditional zeolite-based sound-absorbing materials, its mass is significantly reduced for the same filling volume, effectively meeting the lightweight upgrade requirements of portable electronic devices for speaker components. The presence of aromatic groups (Ar) in the ether bond structural unit provides good structural rigidity, helping to maintain the stability of the porous framework and the shape of the channels, preventing channel collapse during long-term use or in vibration environments, thus ensuring the durability and reliability of the sound absorption performance.

[0029] Optionally, the aromatic group may include: phenylene (e.g., 1,3-phenylene, 1,4-phenylene), naphthylene (e.g., 1,4-naphthylene, 2,6-naphthylene), biphenylene (e.g., 4,4'-biphenylene), triphenylphenyl, etc.

[0030] Optionally, R may include the following carbon-containing groups: C1-C10 straight-chain alkylene groups (e.g., methylene, ethylene, propylene, butylene, hexane), C3-C10 branched alkylene groups (e.g., 2-methylpropylene, 2,2-dimethylpropylene), C3-C10 cycloalkylene groups (e.g., 1,4-cyclohexane), and arylalkylene groups (e.g., benzylene, phenylethylene).

[0031] It should be noted that the specific selection of Ar and R must be sufficient to form an organic cage polymer with a three-dimensional porous structure through ether bonding. That is, Ar and R together constitute the skeletal unit of the cage-like molecule, forming stable ether bonds through a condensation reaction. The above combination of Ar and R can be rationally selected according to actual needs.

[0032] Optionally, the porous organic cage polymer contains micropores with a diameter of 0.3 to 1.9 nm; for example, the pore size of the micropores in the porous organic cage polymer is 0.3 nm, 0.4 nm, 0.5 nm, 0.6 nm, 0.7 nm, 0.8 nm, 0.9 nm, 1 nm, 1.2 nm, 1.4 nm, 1.5 nm, 1.6 nm, 1.8 nm, 1.9 nm, etc.

[0033] In this embodiment, the micropores can provide a high specific surface area and abundant adsorption sites, which is conducive to the rapid adsorption of gas molecules on the surface of the pores during the sound wave propagation process, thereby enhancing the sound energy dissipation effect.

[0034] Optionally, the density of the porous organic cage polymer is less than 0.25 g / mL.

[0035] In this embodiment, the low-density characteristic provides the sound-absorbing material with a significant lightweight advantage. Traditional zeolite sound-absorbing particles are inorganic porous materials with high skeletal density; even in a porous state, their bulk density is still significantly higher than that of the porous organic cage polymer of this invention. Under the same volume usage conditions, the mass of the sound-absorbing material of this invention can be reduced by more than 40% compared to traditional zeolite sound-absorbing particles, while maintaining the same low-frequency improvement effect on the loudspeaker, thus meeting the lightweight requirements.

[0036] In one feasible embodiment, the molecular weight of the porous organic cage polymer is 5,000 to 1,000,000. For example, the molecular weight of the porous organic cage polymer is 5,000, 10,000, 100,000, 1,000,000, etc.

[0037] In this embodiment, controlling the molecular weight within the range of 5,000 to 1,000,000 enables the polymer to form a moderately cross-linked three-dimensional porous structure while maintaining a low density, thus meeting the requirements for lightweighting while ensuring the integrity and connectivity of the pore structure.

[0038] In one feasible embodiment, the specific surface area of ​​the porous organic cage polymer is greater than 300 m². 2 / g.

[0039] In this embodiment, specific surface area is a key parameter for evaluating the adsorption performance of porous materials, and its value directly reflects the total number of effective adsorption sites for gas molecules within a unit mass or unit volume of material. In this embodiment of the invention, a higher specific surface area means that more air molecule adsorption sites can be provided with the same filling volume. When the specific surface area of ​​the porous organic cage polymer is greater than 300 m², the adsorption performance is significantly improved. 2At / g, it can provide sufficient adsorption sites in the limited rear cavity space, effectively adsorbing a large number of air molecules during the positive pressure stage of the sound wave, thereby simulating an equivalent additional cavity volume, significantly reducing the resonant frequency of the speaker, and improving low-frequency response performance.

[0040] In one feasible embodiment, the porous organic cage polymer also contains a pore structure of 6 to 100 nm; for example, the pore size of the pore structure is: 6 nm, 8 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, etc.

[0041] In this embodiment, the porous organic cage polymer contains both micropores and pore structures, which are interconnected to provide excellent channels for air molecules to enter and exit the micropores. The micropores provide high adsorption potential sites, achieving high air adsorption capacity and creating a virtual expansion effect, while the pore structures mainly function as mass transfer channels and buffer spaces. In practical applications, when the speaker diaphragm vibrates, causing an increase in the rear cavity pressure, air molecules can rapidly diffuse into the material through these larger channels and further enter the micropores for adsorption. When the pressure decreases, air molecules can also quickly desorb from the micropores and escape through these larger channels, ensuring a rapid response in the adsorption-desorption cycle and thus improving the acoustic performance of the sound-absorbing material.

[0042] In one feasible embodiment, the porous organic cage polymer is formed into particles with a particle size of 0.1~600 μm.

[0043] Optionally, the porous organic cage polymer is formed in the form of particles with particle sizes of 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, etc.

[0044] In this embodiment, when the porous organic cage polymer is formed into particles with a particle size controlled within the range of 0.1~30 μm, the particles have a large specific surface area and high surface activity, enabling them to effectively wet and bind with the adhesive. Through the adhesive's bonding effect, stable spheres or aggregates can be formed, facilitating subsequent filling operations. Simultaneously, small particle size facilitates uniform dispersion in the adhesive, avoiding uneven filling caused by localized agglomeration. When the particle size is controlled within the range of 30~600 μm, the particles themselves possess sufficient size and flowability, allowing them to be directly filled into the speaker without additional adhesive molding steps, simplifying the production process. Furthermore, a suitable particle size ensures good filling flowability while avoiding dust problems caused by excessively fine particles, and also avoids problems such as excessively large filling voids and insufficient adsorption material per unit volume caused by excessively coarse particles.

[0045] In one feasible embodiment, the sound-absorbing material further includes: an adhesive for bonding the porous organic cage polymer into sound-absorbing particles in granular and / or sheet form.

[0046] In this embodiment, the fine porous organic cage polymer particles are bonded together into larger particles using an adhesive. This effectively prevents the fine particles from scattering or leaking due to vibration during the filling process of the speaker's rear cavity. Simultaneously, the larger particles have good flowability, facilitating the implementation of an automated, quantitative filling process. Furthermore, the sheet-like shape of the sound-absorbing particles allows for better utilization of the irregularly shaped space within the rear cavity, achieving higher space utilization.

[0047] Alternatively, the sheet-shaped sound-absorbing particles can be coated and bonded to the inner shell surface of the front and / or rear acoustic cavities of the sound-generating device, or bonded to the inner shell surface by means of adhesive backing or dotting.

[0048] In one feasible embodiment, the particle size of the sound-absorbing particles is 110~1000 μm; for example, the particle size of the sound-absorbing particles is 110 μm, 120 μm, 130 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, etc.

[0049] Optionally, the particle size of the sound-absorbing particles is 160~500 μm. Within this range, the sound-absorbing particles can better fill the rear cavity space of the loudspeaker, have a higher surface area, and the sound-absorbing material plays a more significant role, resulting in better acoustic performance.

[0050] In one feasible embodiment, the adhesive includes: organic adhesives and / or inorganic adhesives.

[0051] Optionally, the organic adhesive includes one or more of the following: polyacrylate adhesives, polyurethane adhesives, polystyrene adhesives, and epoxy adhesives.

[0052] Optionally, polyacrylate adhesives have good flexibility and weather resistance, and the cured adhesive layer is transparent and does not easily yellow, with minimal impact on the pore structure of porous organic cage polymers; polyurethane adhesives have excellent bonding strength and elasticity, and can absorb vibration energy, making them suitable for the dynamic environment during speaker operation; polystyrene adhesives can form a strong weld effect at particle contact points; epoxy adhesives have high strength, high heat resistance and low shrinkage, making them suitable for applications requiring high bonding strength and temperature resistance.

[0053] Optionally, inorganic adhesives may include one or more of silica sol, alumina sol, silicate adhesives, and phosphate adhesives.

[0054] Optionally, silica sol and alumina sol are colloidal solutions formed by dispersing nano-silica or nano-alumina particles in water. During drying or heat treatment, the colloidal particles dehydrate and condense to form an inorganic network, which bonds the porous organic cage polymer particles together. Silicate adhesives (such as sodium silicate, potassium silicate, etc.) and phosphate adhesives (such as aluminum phosphate, magnesium phosphate, etc.) form an inorganic ceramic phase after curing, exhibiting excellent high-temperature resistance and chemical stability. Compared with organic adhesives, inorganic adhesives have weaker intrinsic hydrophobicity but higher heat resistance, and do not release volatile organic compounds after complete curing, making them more environmentally friendly.

[0055] In one feasible embodiment, the adhesive accounts for 2.5% to 20% of the total mass of the sound-absorbing particles. For example, the adhesive accounts for 2.5%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20% of the total mass of the sound-absorbing particles.

[0056] In this embodiment, by controlling the amount of adhesive within the range of 2.5% to 20% of the total mass of the sound-absorbing particles, a balance between structural strength and sound absorption performance can be achieved. A dosage of at least 2.5% ensures that the particles maintain structural integrity and are not easily broken during filling and speaker vibration, while a dosage of at least 20% prevents excessive clogging of the micropores by the adhesive, effectively preserving the specific surface area and air adsorption capacity of the porous organic cage polymer. Within this range, the sound-absorbing particles possess both good mechanical strength and excellent low-frequency improvement effects.

[0057] In this embodiment, a sound-absorbing material is provided. A porous organic cage polymer is introduced as the core component. The molecular chain of the porous organic cage polymer contains -Ar-OR- ether bond structural units, and the carbon atom in R is directly connected to the oxygen atom in the ether bond structural unit, forming a stable three-dimensional porous structure containing micropores in the range of 0.3~1.9 nm. The sound-absorbing material has a density of less than 0.25 g / mL. Compared with traditional zeolite-based sound-absorbing materials, its mass is significantly reduced under the same volume usage conditions, which is beneficial for achieving lightweight applications. Simultaneously, the micropores in the 0.3~1.9 nm range of this material can produce good adsorption and desorption effects on air molecules (such as nitrogen and oxygen), effectively dissipating sound wave energy, thereby giving the sound-absorbing material excellent sound absorption performance.

[0058] This invention also provides a sound-generating device, which includes a housing and a sound-generating unit disposed within the housing. The housing has an internal space, and the sound-generating unit cooperates with the housing to define a front sound cavity and a rear sound cavity within the internal space. The front sound cavity and / or the rear sound cavity are filled with the sound-absorbing material described above.

[0059] Optionally, refer to Figure 1 The sound-generating device includes: a sound-generating unit 20, a housing 10, and a sound-absorbing material 1 as described above. The sound-generating unit 20 is disposed within the housing 10 and cooperates with the housing 10 to define a front sound cavity 102 and a rear sound cavity 101. The sound-absorbing material 1 fills the rear sound cavity 101 and / or the front sound cavity 102. When the sound-absorbing material 1 fills the front sound cavity 102, it can increase the damping within the front sound cavity 102, thereby reducing the distortion peaks of the sound-generating device and effectively suppressing harmonic distortion and high-frequency noise caused by higher harmonics. When the sound-absorbing material 1 fills the rear sound cavity 101, the channels within the sound-absorbing material 1 can achieve a good sound absorption effect, increasing the virtual volume of the rear sound cavity 101, thereby improving the low-frequency performance of the sound-generating device.

[0060] Optionally, the sound-absorbing material can be made into granules and filled into the sound-generating device, or it can be made into a sheet and coated and bonded to the inner shell surface of the front and / or rear sound cavity of the sound-generating device, or bonded to the inner shell surface by means of adhesive backing or dotting. The specific manufacturing method can be determined according to actual needs, and the present invention does not limit it.

[0061] Compared with conventional technology, the beneficial effects of the sound-generating device provided in the embodiments of the present invention are the same as those of the sound-absorbing material provided in the above embodiments, and other technical features of the sound-generating device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0062] This invention also provides an electronic device, including the sound-absorbing material or sound-generating device described above.

[0063] In this embodiment, electronic devices include mobile phones, laptops, tablets, VR (Virtual Reality) devices, AR (Augmented Reality) devices, TWS (True Wireless Stereo) earphones, smart speakers, smart wearable devices, etc.

[0064] Compared with conventional technology, the beneficial effects of the electronic device provided in the embodiments of the present invention are the same as those of the sound-absorbing material provided in the above embodiments, and other technical features of the electronic device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0065] To ensure that the details and operations of the above embodiments of the present invention can be clearly understood by those skilled in the art, and to demonstrate the significant advancements in the performance of the embodiments of the present invention, the following examples illustrate the above technical solutions. It should be noted that the following descriptions are merely exemplary and not intended to limit the specific scope of the present invention.

[0066] Example 1 A coplanar cobalt porphyrin porous organic cage polymer was selected, wherein the porous organic cage polymer has a density of 0.18 g / mL and a specific surface area of ​​700 m². 2 / g, particle size 2~8 μm, pore size 0.64~10 nm (including micropores and pore structure); Weigh out the porous organic cage polymer based on a powder solid content of 30% in the solution, add it to a solvent with a volume ratio of ethanol to water of 1.5:8.5, and stir to mix evenly; Weigh out 5% of the final solids content of the adhesive and slowly add it dropwise to the above-mentioned stirred solution. The adhesive is a polyacrylate adhesive with a solid content of 45%. The inlet air temperature of the spray drying granulation equipment is set to 120℃. Once the internal temperature reaches above 80℃, the feeding pressure is set to 0.5 MPa. The feed is then used to granulate the material and obtain preliminary granular material. The above preliminary granular material was placed in a 100℃ oven and dried for 30 minutes. The granules were then sieved to obtain sound-absorbing granules of 250~450 μm. Measure 0.32 mL of the above sound-absorbing particles and fill them into the rear acoustic cavity of the speaker module, which has a rear cavity volume of 0.38 mL, to complete the product manufacturing.

[0067] Comparative Example 1 Measure 0.32 mL of commonly used zeolite sound-absorbing particles with a density of 0.4 g / mL and fill them into the rear acoustic cavity of the speaker module with a volume of 0.38 mL to complete the product manufacturing.

[0068] Comparative Example 2 A porous organic cage polymer was synthesized using 5,10,15,20-tetra(4-hydroxyphenyl)porphyrin and 2,4-dichloro-6-phenyl-1,3,5-triazine as matrix building units. The polymer had a density of 0.18 g / mL and a specific surface area of ​​120 m². 2 / g, particle size 2~8 μm, pore size 2.5~10 nm; Weigh out the porous organic cage polymer based on a powder solid content of 30% in the solution, add it to a solvent with a volume ratio of ethanol to water of 1.5:8.5, and stir to mix evenly; Weigh out 5% of the final solids content of the adhesive and slowly add it dropwise to the above-mentioned stirred solution. The adhesive is a polyacrylate adhesive with a solid content of 45%. The inlet air temperature of the spray drying granulation equipment is set to 120℃. Once the internal temperature reaches above 80℃, the feeding pressure is set to 0.5 MPa. The feed is then used to granulate the material and obtain preliminary granular material. The above preliminary granular material was placed in a 100℃ oven and dried for 30 minutes. The granules were then sieved to obtain sound-absorbing granules of 250~450 μm. Measure 0.32 mL of the above sound-absorbing particles and fill them into the rear acoustic cavity of the speaker module, which has a rear cavity volume of 0.38 mL, to complete the product manufacturing.

[0069] The speaker modules in the above embodiments and comparative examples are of the same model, and the volume and particle size of the sound-absorbing particles are the same. Since the density of the sound-absorbing particles in Embodiment 1 is lower, the mass of the sound-absorbing particles in Embodiment 1 is reduced by 55% compared to Comparative Example 1, a reduction of 70.4 mg, making the speaker lighter.

[0070] Acoustic tests were conducted on the speakers in the above scheme. SoundCheck software and a speaker testing system were used to perform IMP (impedance measurement) tests on the speakers, and the impedance curves and resonant frequency F0 of the speakers were measured. The results are shown in Table 1 below: Table 1

[0071] Based on the above experimental results, it can be seen that the acoustic performance of Example 1 and Comparative Example 1 is basically the same, while the speaker F0 of Comparative Example 2 is higher and has almost no effect on reducing F0. This is mainly because the porous organic cage polymer selected for Comparative Example 2 has a low specific surface area and lacks rich microporous structure inside. The smallest pore size is 2.5 nm, so the acoustic performance is poor and the speaker F0 is higher.

[0072] Furthermore, the speaker modules of Example 1 and Comparative Example 1 were subjected to a high-power lifespan test at 2.83 V with a white noise signal for 96 hours. Afterwards, changes in acoustic performance were tested, and the magnetic circuit was disassembled to check for any powder leakage contaminating the magnetic circuit, thus testing its reliability. The results are shown in Table 2 below: Table 2

[0073] The experimental results show that the F0 of the speaker in Example 1 remains almost constant at 5 Hz, within the acceptable range of 60 Hz, exhibiting good reliability. The F0 of the speaker in Comparative Example 1 changes by 18 Hz, which, although also within the acceptable range of 60 Hz, is significantly larger than that in Example 1. This indicates that the sound-absorbing material of Example 1 of the present invention can better withstand the reliability test conditions.

[0074] In summary, the sound-absorbing material provided by this invention has essentially the same acoustic improvement effect as existing zeolite materials. In loudspeaker reliability tests, the zeolite sound-absorbing material performs better. Furthermore, in practical applications, it can reduce the filling mass of the sound-absorbing particles, thereby reducing the overall mass of the loudspeaker module and providing some weight reduction to meet the lightweight requirements of loudspeakers.

[0075] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the patent protection scope of the present invention.

Claims

1. A sound-absorbing material, characterized in that, The sound-absorbing material comprises: a porous organic cage polymer, wherein the molecular chain of the porous organic cage polymer includes ether bond structural units as shown in formula (I): -Ar-OR- (I); Wherein, Ar is an aromatic group, R is a group containing carbon atoms, and at least one carbon atom in R is directly connected to an oxygen atom in the ether bond structural unit; the porous organic cage polymer has a three-dimensional porous structure formed by the linkage of the ether bond structural units and contains micropores of 0.3~1.9 nm; the density of the porous organic cage polymer is less than 0.25 g / mL.

2. The sound-absorbing material as described in claim 1, characterized in that, The molecular weight of the porous organic cage polymer is 5,000 to 1,000,000.

3. The sound-absorbing material as described in claim 1, characterized in that, The specific surface area of ​​the porous organic cage polymer is greater than 300 m². 2 / g.

4. The sound-absorbing material as described in claim 1, characterized in that, The porous organic cage polymer also contains a pore structure of 6-100 nm.

5. The sound-absorbing material as described in claim 1, characterized in that, The porous organic cage polymer is formed into particles with a particle size of 0.1~600 μm.

6. The sound-absorbing material according to any one of claims 1 to 5, characterized in that, The sound-absorbing material further includes an adhesive for bonding the porous organic cage polymer into sound-absorbing particles in granular and / or sheet form.

7. The sound-absorbing material as described in claim 6, characterized in that, The sound-absorbing particles have a particle size of 110~1000 μm; And / or, the adhesive comprises: organic adhesives and / or inorganic adhesives.

8. The sound-absorbing material as described in claim 6, characterized in that, The adhesive accounts for 2.5% to 20% of the total mass of the sound-absorbing particles.

9. A sound-generating device, characterized in that, The sound-generating device includes a housing and a sound-generating unit disposed within the housing. The housing has an internal space, and the sound-generating unit cooperates with the housing to define a front acoustic cavity and a rear acoustic cavity within the internal space. The front acoustic cavity and / or the rear acoustic cavity are filled with a sound-absorbing material as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, The electronic device includes the sound-absorbing material as described in any one of claims 1 to 8, or the sound-generating device as described in claim 9.

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