Sound absorbing member, method for manufacturing the same, and sound emitting device

Abstract

The application discloses a sound-absorbing piece, a preparation method thereof and a sound-emitting device. The preparation method of the sound-absorbing piece comprises the following steps: preparing a mixed slurry, wherein the mixed slurry at least comprises a porous material and a moisture-cured inorganic adhesive; granulating the mixed slurry to obtain sound-absorbing particles; and performing post-curing treatment on the sound-absorbing particles to obtain a sound-absorbing piece formed by bonding a plurality of the sound-absorbing particles. The sound-absorbing piece prepared by the application can effectively solve the problem that the sound-absorbing particles in the sound-emitting device are prone to produce powder under a high-power state, so that the sound-emitting device can still have high low-frequency performance after high-power work, and the durability and service life of the sound-emitting device are improved.

Description

Technical Field

[0001] This invention relates to the field of acoustics, specifically to a sound-absorbing component, its preparation method, and a sound-generating device. Background Technology

[0002] In recent years, the trend towards thinner and lighter electronic products has resulted in less space for sound-generating devices. Consequently, these devices have become increasingly flat, significantly reducing the volume of the acoustic cavity and impacting their low-frequency performance. Related technologies address this by filling the acoustic cavity with porous materials. The porous structure allows for rapid adsorption and desorption of gases within the cavity, effectively increasing the virtual resonant space and thus lowering the resonant frequency F0, thereby improving the device's low-frequency sensitivity.

[0003] However, when the sound-generating device is operating at high power, the sound-absorbing particles filling the sound cavity of the device collide and rub against each other, making them prone to deformation and breakage. The broken dust enters the sound-generating unit, affecting its normal operation, causing the resonant frequency F0 to increase and the low-frequency performance to decrease. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-absorbing component and its preparation method, as well as a sound-generating device, in order to solve the technical problem that the low-frequency performance of sound-generating devices deteriorates after high-power operation in related technologies.

[0005] To achieve the above objectives, this application provides a method for preparing a sound-absorbing component, the method comprising the following steps:

[0006] Prepare a mixed slurry, wherein the mixed slurry comprises at least a porous material and a moisture-curing inorganic adhesive;

[0007] The mixed slurry is granulated to obtain sound-absorbing particles;

[0008] The sound-absorbing particles are subjected to post-curing treatment to obtain a sound-absorbing component made of multiple sound-absorbing particles bonded together.

[0009] Optionally, the step of post-curing the sound-absorbing particles to obtain a sound-absorbing component made of multiple sound-absorbing particles bonded together includes:

[0010] After the surface of the sound-absorbing particles is dried, the sound-absorbing particles are filled into the acoustic cavity of the sound-generating device;

[0011] The sound-absorbing particles in the acoustic cavity are subjected to post-curing treatment to obtain at least one sound-absorbing component made of multiple sound-absorbing particles bonded together.

[0012] Optionally, the post-curing process conditions include: humidity 50%-100%, and / or temperature 20℃-100℃.

[0013] Optionally, the granulation includes one of the following: spray drying granulation, fluidized bed granulation, freeze drying granulation, and stirred granulation.

[0014] Optionally, the moisture-curing inorganic adhesive includes at least one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates;

[0015] And / or, the moisture-curing inorganic adhesive accounts for 1%-30% of the mass of the sound-absorbing particles.

[0016] Optionally, the porous material comprises zeolite powder particles, wherein the silicon-to-aluminum mass ratio of the zeolite powder particles is less than 200, and the average particle size of the zeolite powder particles is greater than 10 μm.

[0017] Optionally, the zeolite powder particles have at least one of the crystal structures of MOR, MFI, and FER.

[0018] Optionally, the mixed slurry further includes reinforcing fillers, which include at least one of transparent powder, glass powder, silica, carbon black, talc, calcium carbonate, alumina, and aluminum hydroxide.

[0019] Optionally, the particle size of the reinforcing filler is 0.01-5 μm.

[0020] Optionally, the reinforcing filler accounts for 5%-30% of the mass of the sound-absorbing particles.

[0021] Optionally, the particle size of the sound-absorbing particles is 100-700 μm.

[0022] Optionally, the sound-absorbing element includes at least one block-shaped sound-absorbing structure composed of a plurality of the sound-absorbing particles;

[0023] And / or, the pore volume of the sound-absorbing element is greater than 0.01 mL / g.

[0024] This application also provides a sound-absorbing component, which is prepared by the sound-absorbing component preparation method described above.

[0025] This application also provides a sound-generating device, which includes a housing, a sound-generating unit, and a sound-absorbing component as described above;

[0026] The sound-generating unit is disposed within the housing, and the sound-generating unit and the housing cooperate to form a front acoustic cavity and a rear acoustic cavity, and the sound-absorbing component is disposed in the front acoustic cavity and / or the rear acoustic cavity.

[0027] This application provides a sound-absorbing component and its preparation method, as well as a sound-generating device. The preparation method of the sound-absorbing component includes the following steps: preparing a mixed slurry, wherein the mixed slurry includes at least a porous material and a moisture-curing inorganic adhesive; granulating the mixed slurry to obtain sound-absorbing particles; and performing a post-curing treatment on the sound-absorbing particles to obtain a sound-absorbing component formed by bonding multiple sound-absorbing particles together. Sound-absorbing particles are prepared by mixing porous materials with moisture-curing inorganic adhesives. These particles, composed of multiple porous materials bonded together, retain the porous structure of the materials, thus improving the low-frequency performance of the sound-generating device. Further curing allows these particles to bond together to form a single sound-absorbing component. When the sound-generating device operates at high power, the bonding between the particles restricts their flow, effectively preventing friction and collisions and significantly reducing the risk of breakage. This overcomes the technical shortcomings of traditional sound-absorbing devices where particles colliding and rubbing against each other during high-power operation can easily deform and break, leading to dust entering the sound-generating unit, affecting its normal operation, increasing the resonant frequency F0, and decreasing low-frequency performance. This method ensures the sound-generating device maintains high low-frequency performance even after high-power operation, improving its durability and lifespan. Moreover, after the sound-absorbing particles are formed in the above method, they can be filled into the sound cavity of the sound-generating device in the form of filling, and then the sound-absorbing particles are cured to form a block-shaped sound-absorbing component, thereby improving the assembly efficiency of the sound-absorbing component. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic flowchart of an embodiment of the method for preparing the sound-absorbing component of the present invention;

[0030] Figure 2 This is a schematic diagram of one possible implementation of the sound-absorbing component in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of another possible implementation of the sound-absorbing component in this invention.

[0032] Figure 4 This is a comparison chart of the frequency response curves of the embodiments and comparative examples of the present invention before the reliability test;

[0033] Figure 5 This is a comparison graph of the frequency response curves of the embodiments and comparative examples of the present invention after reliability experiments.

[0034] Explanation of reference numerals in the accompanying drawings of the embodiments:

[0035] 20 case 30 Voice generator 40 Acoustic back cavity

[0036] 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

[0037] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] This application provides a method for preparing a sound-absorbing component. In one embodiment of the method for preparing the sound-absorbing component, refer to... Figure 1 The method for preparing the sound-absorbing component includes the following steps:

[0039] Step S10: Prepare a mixed slurry, wherein the mixed slurry includes at least a porous material and a moisture-curing inorganic adhesive;

[0040] In this embodiment, it should be noted that the porous material refers to a material with a network structure composed of interconnected pores, including one or more mixtures of activated carbon, zeolite powder, activated silica, porous alumina, and molecular sieves. Compared with continuous medium materials, porous materials have advantages such as low relative density, high specific strength, high specific surface area, light weight, sound insulation, heat insulation, and good permeability. Utilizing the internal pore structure of the porous material, the gas in the acoustic cavity of the sound-generating device can be rapidly adsorbed and desorbed, achieving a virtual increase in the resonant space of the acoustic cavity of the sound-generating device, thereby effectively reducing the resonant frequency F0 of the sound-generating device and improving the low-frequency sensitivity of the sound-generating device. However, the pore walls of porous materials are relatively thin. When the sound-generating device is in a high-power operating state, the sound-absorbing particles filling the acoustic cavity of the sound-generating device collide and rub against each other, easily deforming and breaking. The broken dust enters the sound-generating unit, affecting the normal operation of the sound-generating unit, leading to an increase in the resonant frequency F0 and a decrease in low-frequency performance.

[0041] Optionally, the porous material comprises zeolite powder particles, wherein the silicon-to-aluminum mass ratio of the zeolite powder particles is less than 200, and the average particle size of the zeolite powder particles is greater than 10 μm.

[0042] In this embodiment, the zeolite powder particles have numerous pores with a wide pore size distribution. That is, the zeolite powder particles typically contain multiple pores of different sizes, which is more conducive to improving the acoustic performance of the sound-generating device. If the particle size of the porous material is too small, fine porous material fragments are easily left behind during the preparation process. These fragments are also easily generated during the processing and use of the sound-absorbing component. These fine porous material fragments may enter the sound-generating unit, affecting its normal operation, leading to an increase in the resonant frequency F0 and a decrease in low-frequency performance. Therefore, the average particle size of the zeolite powder particles is determined to be greater than 10 μm. The zeolite powder particles with a silicon-to-aluminum mass ratio of less than 200 contain abundant aluminum, which can better bond with inorganic adhesives, resulting in higher bonding strength between the zeolite powder particles. Optionally, the average particle size of the zeolite powder particles can be 11 μm, 13 μm, 15 μm, 18 μm, etc., and the silicon-to-aluminum mass ratio in the zeolite powder particles can be 100, 120, 150, 180, etc.

[0043] Optionally, the zeolite powder particles have at least one of the crystal structures of MOR, MFI, and FER.

[0044] In this embodiment, different crystal structures affect the ability of zeolite powder particles to adsorb and desorb air molecules. Zeolite powder particles with at least one of the MOR, MFI and FAU crystal structures can provide a pore structure that facilitates the adsorption and desorption of air molecules, and the structure is regular and has high sound absorption performance.

[0045] The moisture-curing inorganic adhesive refers to an inorganic adhesive that can undergo a cross-linking reaction by absorbing moisture at a relatively low temperature to form a polymer material with high strength and durability. It includes at least one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates. Moisture-curing inorganic adhesives have a low curing temperature, typically below 100°C. This lower curing temperature does not damage the sound-generating monomers or adversely affect their performance. Therefore, there are more options for preparation methods. Sound-absorbing components can be prepared separately and then assembled into the acoustic cavity of the sound-generating device. Alternatively, sound-absorbing particles can be formed and then filled into the acoustic cavity of the sound-generating device, followed by post-curing to form a block-shaped sound-absorbing component. This improves the assembly efficiency of the sound-absorbing component.

[0046] Optionally, the moisture-curing inorganic adhesive includes at least one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates;

[0047] And / or, the moisture-curing inorganic adhesive accounts for 1%-30% of the mass of the sound-absorbing particles.

[0048] In this embodiment, the moisture-curing inorganic adhesive includes at least one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates. If the amount of moisture-curing inorganic adhesive added is too small, the adhesion between porous materials will be poor, resulting in weak strength of the sound-absorbing component and a tendency to crack. If the amount of moisture-curing inorganic adhesive added is too large, it may clog the pores on the surface of the porous materials, affecting the acoustic performance of the sound-generating device. Therefore, the mass percentage of the moisture-curing inorganic adhesive in the sound-absorbing particles is determined to be 1%-30%, for example, 1%, 5%, 10%, 15%, 20%, 25%, 30%, etc.

[0049] Optionally, the mixed slurry further includes reinforcing fillers, which include at least one of transparent powder, glass powder, silica, carbon black, talc, calcium carbonate, alumina, and aluminum hydroxide.

[0050] In this embodiment, reinforcing fillers can also be added to the mixed slurry. These reinforcing fillers are fillers that reinforce the structure of the sound-absorbing component, including at least one of transparent powder, glass powder, silica, carbon black, talc, calcium carbonate, alumina, and aluminum hydroxide. Appropriately filling the structural gaps between the porous materials improves the strength of the sound-absorbing component. This allows the sound-absorbing component to better resist high-intensity impacts and friction when the sound-generating device is operating at high power, reducing the breakage rate of the sound-absorbing component and preventing broken dust from entering the sound-generating unit, affecting its normal operation, and causing an increase in the resonant frequency F0 and a decrease in low-frequency performance.

[0051] Optionally, the particle size of the reinforcing filler is 0.01-5 μm.

[0052] In this embodiment, if the particle size of the reinforcing filler is too large, it will be difficult to fill the gaps between the porous materials, resulting in poor reinforcement. If the particle size of the reinforcing filler is too small, it will easily agglomerate in the solution, making it difficult to disperse and easily clogging the pores of the porous material, thus affecting the acoustic performance of the sound-generating device. Therefore, the particle size of the reinforcing filler is determined to be 0.01-5μm, for example, 0.01μm, 0.1μm, 0.5μm, 1μm, 2μm, 3μm, 4μm, 5μm, etc.

[0053] Optionally, the reinforcing filler accounts for 5%-30% of the mass of the sound-absorbing particles.

[0054] In this embodiment, if the amount of reinforcing filler added is too small, the reinforcing effect will be poor; if the amount of reinforcing filler added is too large, the mass ratio of the porous sound-absorbing material will be relatively reduced, the pore structure will be relatively reduced, and the acoustic performance of the sound-generating device will be affected. Therefore, the mass ratio of the reinforcing filler in the sound-absorbing particles is determined to be 5%-30%, for example, 5%, 10%, 15%, 20%, 25%, 30%, etc.

[0055] For example, step S10 includes: determining in advance the types and proportions of various raw materials for preparing the sound-absorbing component according to product needs; weighing various raw materials according to the raw material proportions; wherein the raw materials include at least porous materials and moisture-curing inorganic adhesives; adding the weighed raw materials to a solvent and mixing them evenly to obtain a mixed slurry. In one feasible embodiment, the solvent may be water.

[0056] Step S20: Granulate the mixed slurry to obtain sound-absorbing particles;

[0057] For example, step S20 includes: after uniformly mixing the porous material and the moisture-curing inorganic adhesive with a solvent, the solvent in the mixed slurry can be removed by means of heating and drying, freeze drying, spray drying, etc. During the granulation process, the moisture-curing inorganic adhesive can connect multiple porous materials to form sound-absorbing particles.

[0058] Optionally, the granulation includes one of the following: spray drying granulation, fluidized bed granulation, freeze drying granulation, and stirred granulation.

[0059] In this embodiment, the mixed slurry can be granulated using spray drying granulation, fluidized bed granulation, freeze drying granulation, or stirring granulation to obtain sound-absorbing particles. Optionally, the particle size of the sound-absorbing particles is 100-700 μm.

[0060] In this embodiment, if the particle size of the sound-absorbing particles is too large, there will be fewer connection points during the post-curing process, resulting in lower bonding tightness between the formed sound-absorbing components. The sound-absorbing components are prone to breakage under high-intensity impact and friction. Conversely, if the particle size of the sound-absorbing particles is too small, small dust particles are easily generated during processing or use due to residue or breakage. This dust enters the sound-generating unit, affecting its normal operation, leading to an increase in the resonant frequency F0 and a decrease in low-frequency performance. Therefore, the particle size of the sound-absorbing particles is determined to be 100-700 μm, for example, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, etc.

[0061] Step S30: The sound-absorbing particles are subjected to post-curing treatment to obtain a sound-absorbing component made of multiple sound-absorbing particles bonded together.

[0062] For example, step S30 includes: placing the sound-absorbing particles in an environment with a certain temperature and humidity, allowing the moisture-curing inorganic adhesive in the sound-absorbing particles to absorb moisture from the environment, thereby cross-linking at a lower temperature, and thus bonding multiple sound-absorbing particles into one or more block-shaped sound-absorbing structures, which can be used as sound-absorbing components. The temperature and humidity of the post-curing treatment should allow the moisture-curing inorganic adhesive to cross-link while ensuring that the sound-generating monomers are not damaged. The specific temperature and humidity can be determined according to actual conditions, and this embodiment does not impose any limitations on this. Compared to filling the acoustic cavity of a sound-generating device with sound-absorbing particles, filling with a whole block-shaped sound-absorbing structure can reduce the free flow between sound-absorbing particles, avoid collisions and friction between them, greatly reduce the risk of breakage of the sound-absorbing material, and improve its durability and service life.

[0063] Optionally, the step of post-curing the sound-absorbing particles to obtain a sound-absorbing component made of multiple sound-absorbing particles bonded together includes:

[0064] Step S31: After the surface of the sound-absorbing particles is dried, the sound-absorbing particles are filled into the sound cavity of the sound-generating device;

[0065] Step S32: Perform post-curing treatment on the sound-absorbing particles in the acoustic cavity to obtain at least one sound-absorbing component made of multiple sound-absorbing particles bonded together.

[0066] In this embodiment, the curing temperature of the moisture-curing inorganic adhesive is relatively low, usually less than 100°C. The low curing temperature will not damage the sound-generating monomer, nor will it adversely affect the performance of the sound-generating monomer. Therefore, after the sound-absorbing particles are formed, they can be filled into the sound cavity of the sound-generating device by filling, and then the sound-absorbing particles are cured to form a block-shaped sound-absorbing component, thereby improving the assembly efficiency of the sound-absorbing component.

[0067] The sound-generating unit and the housing of the sound-generating device can be pre-assembled to form a sound cavity between the sound-generating unit and the housing.

[0068] For example, steps S31 to S32 include: after obtaining sound-absorbing particles through granulation and drying the surface of the sound-absorbing particles, the sound-absorbing particles can be filled into the acoustic cavity of a pre-prepared sound-generating device, and the sound-generating device filled with sound-absorbing particles can be placed in an environment with a certain temperature and humidity, so that the moisture-curing inorganic adhesive in the sound-absorbing particles absorbs the moisture in the environment, thereby cross-linking in the acoustic cavity, and bonding multiple sound-absorbing particles into one or more block-shaped sound-absorbing components.

[0069] In one feasible approach, refer to Figure 2 and Figure 3First, the sound-generating unit 30 and the shell 20 can be assembled into a sound-generating device, and a sound cavity 40 can be formed between the sound-generating unit 30 and the shell 20. The sound-absorbing particles 11 are then filled into the pre-prepared sound cavity 40 of the sound-generating device. The sound-generating device filled with the sound-absorbing particles 11 is placed in an environment with a certain temperature and humidity, allowing the moisture-curing inorganic adhesive in the sound-absorbing particles 11 to absorb moisture from the environment, thereby causing cross-linking in the sound cavity 40 and bonding multiple sound-absorbing particles 11 together as shown. Figure 2 The image shows a single piece of sound-absorbing material, or as shown... Figure 3 The image shows multiple block-shaped sound-absorbing components.

[0070] The sound-absorbing component 10 includes at least one block-shaped sound-absorbing structure composed of a plurality of sound-absorbing particles 11.

[0071] Optionally, the post-curing process conditions include: humidity 50%-100%, and / or temperature 20℃-100℃.

[0072] In this embodiment, in an environment with humidity of 50%-100%, such as 50%, 60%, 70%, 80%, 90%, or 100%, the moisture-curing inorganic adhesive can absorb moisture from the environment and undergo cross-linking. In an environment with temperature of 20°C-100°C, such as 20°C, 40°C, 60°C, 80°C, or 100°C, the moisture-curing inorganic adhesive can absorb moisture from the environment and undergo cross-linking without damaging the sound-generating monomer or adversely affecting its performance.

[0073] Optionally, the sound-absorbing element includes at least one block-shaped sound-absorbing structure composed of a plurality of the sound-absorbing particles;

[0074] And / or, the pore volume of the sound-absorbing element is greater than 0.01 mL / g.

[0075] In this embodiment, the sound-absorbing component can be a single block-shaped sound-absorbing structure composed of multiple sound-absorbing particles, or it can include multiple block-shaped sound-absorbing structures composed of multiple sound-absorbing particles. The number and size of the block-shaped sound-absorbing structures in the sound-absorbing component should ensure that the sound-absorbing component has sufficient pore structure to improve the acoustic performance of the sound-generating device, and make it less prone to deformation and breakage when the sound-generating device is in a high-power operating state. The specific details can be determined based on actual conditions and actual acoustic performance test results, etc., and this embodiment does not impose any limitations on this. The pore volume of the sound-absorbing component is greater than 0.01 mL / g, which enables rapid adsorption and desorption of gas in the sound cavity of the sound-generating device, achieving the effect of virtually increasing the resonant space of the sound cavity of the sound-generating device, thereby effectively reducing the resonant frequency F0 of the sound-generating device, improving the low-frequency sensitivity of the sound-generating device, and ensuring that the sound-generating device has relatively excellent acoustic performance.

[0076] In this embodiment, the method for preparing the sound-absorbing component includes the following steps: preparing a mixed slurry, wherein the mixed slurry includes at least a porous material and a moisture-curing inorganic adhesive; granulating the mixed slurry to obtain sound-absorbing particles; and performing a post-curing treatment on the sound-absorbing particles to obtain a sound-absorbing component formed by bonding multiple sound-absorbing particles together. Sound-absorbing particles are prepared by mixing porous materials with moisture-curing inorganic adhesives. These particles, composed of multiple porous materials bonded together, retain the porous structure of the materials, thus improving the low-frequency performance of the sound-generating device. Further curing allows these particles to bond together to form a single sound-absorbing component. When the sound-generating device operates at high power, the bonding between the particles restricts their flow, effectively preventing friction and collisions and significantly reducing the risk of breakage. This overcomes the technical shortcomings of traditional sound-absorbing devices where particles colliding and rubbing against each other during high-power operation can easily deform and break, leading to dust entering the sound-generating unit, affecting its normal operation, increasing the resonant frequency F0, and degrading low-frequency performance. This method ensures the sound-generating device maintains high low-frequency performance even after high-power operation, improving its durability and lifespan. Moreover, after the sound-absorbing particles are formed in the above method, they can be filled into the sound cavity of the sound-generating device in the form of filling, and then the sound-absorbing particles are cured to form a block-shaped sound-absorbing component, thereby improving the assembly efficiency of the sound-absorbing component.

[0077] Furthermore, the present invention also provides a sound-absorbing component, which is prepared by the sound-absorbing component preparation method described above.

[0078] The sound-absorbing component provided in this application solves the technical problem in related technologies where the low-frequency performance of sound-generating devices deteriorates after high-power operation, i.e., the sound-absorbing particles in the sound-generating device are prone to breakage at high frequencies. Compared with the prior art, the beneficial effects of the sound-absorbing component provided in this embodiment are the same as the beneficial effects of the preparation method of the sound-absorbing component in the above embodiments, and will not be repeated here.

[0079] Furthermore, the present invention also provides a sound-generating device, the sound-generating device comprising a housing, a sound-generating unit, and a sound-absorbing element as described in the above embodiments;

[0080] The sound-generating unit is disposed within the housing, and the sound-generating unit and the housing cooperate to form a front acoustic cavity and a rear acoustic cavity, and the sound-absorbing component is disposed in the front acoustic cavity and / or the rear acoustic cavity.

[0081] The sound-generating device provided in this application solves the technical problem in related technologies where the low-frequency performance of sound-generating devices deteriorates after high-power operation. Compared with the prior art, the beneficial effects of the sound-generating device provided in this embodiment are the same as the beneficial effects of the housing in the above embodiments, and will not be repeated here.

[0082] The housing of the present invention will now be described in detail with reference to specific embodiments and comparative examples. It is to be understood that the following description is merely exemplary and not intended to limit the specific scope of the invention.

[0083] Example

[0084] Zeolite powder was selected as the porous material, phosphate as the moisture-curing inorganic adhesive, and 10% transparent powder was added as a reinforcing filler. The above raw materials were added to water and mixed evenly to prepare a slurry. The slurry was then granulated to obtain sound-absorbing particles. After the surface of the sound-absorbing particles was dried, the sound-absorbing particles were filled into the acoustic rear cavity of the sound-generating device. The sound-generating device and the sound-absorbing particles were placed together in an environment with a temperature of 85°C and a humidity of 95% for 48 hours to cure, so that the sound-absorbing particles would bond together to form an integral sound-absorbing component, thus obtaining a sound-generating device with a sound-absorbing component in the acoustic rear cavity.

[0085] Comparative Example

[0086] Zeolite powder is selected as the porous material, epoxy resin is selected as the adhesive, and 10% transparent powder is added as a reinforcing filler. The above raw materials are added to water and mixed evenly to prepare a mixed slurry. Granulation is performed to obtain sound-absorbing particles. The cured sound-absorbing particles are filled into the acoustic rear cavity of the sound-generating device to obtain a sound-generating device with sound-absorbing particles in the acoustic rear cavity.

[0087] Prior to the reliability test, frequency response curve tests were performed on the sound-generating devices prepared in the examples and comparative examples. The test results before the reliability test are as follows: Figure 4 As shown; furthermore, reliability tests were conducted on the sound-generating devices prepared in the embodiments and comparative examples. After the reliability tests, the F0 of the sound-generating devices was tested, and the sound-generating devices were disassembled to observe the damage of the sound-absorbing components. The test results are shown in Table 1. The frequency response curves of the sound-generating devices prepared in the embodiments and comparative examples were then tested again. The test results after the reliability tests are shown in Table 1. Figure 5 As shown. The reliability test conditions were: 65℃ temperature, 95%RH environment, 3.5V voltage with noise signal, and continuous power-on operation for 120 hours.

[0088] Table 1

[0089]

[0090] from Figure 4As can be seen from the data, the F0 values ​​of the examples and the comparative examples are close, indicating that the sound-absorbing particles are bonded together as a whole after post-curing treatment, and there is no loss of acoustic performance.

[0091] From Table 1 and Figure 5 It can be seen that the F0 of the embodiment changed little after the reliability test, while the F0 of the comparative example increased significantly after the reliability test. Moreover, the sound-absorbing part of the comparative example was severely broken and shed powder. This indicates that bonding the sound-absorbing particles into a whole restricts the free flow between the sound-absorbing particles, avoids collision and friction between the sound-absorbing particles, and reduces the risk of breakage of the sound-absorbing part.

[0092] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for preparing a sound-absorbing component, characterized in that, The method for preparing the sound-absorbing component includes the following steps: Prepare a mixed slurry, wherein the mixed slurry comprises at least a porous material and a moisture-curing inorganic adhesive; The mixed slurry is granulated to obtain sound-absorbing particles; After the surface of the sound-absorbing particles is dried, the sound-absorbing particles are filled into the acoustic cavity of the sound-generating device; The sound-absorbing particles in the acoustic cavity are subjected to post-curing treatment to obtain at least one sound-absorbing component made of multiple sound-absorbing particles bonded together, wherein the sound-absorbing component includes at least one block-shaped sound-absorbing structure composed of multiple sound-absorbing particles.

2. The method for preparing the sound-absorbing component as described in claim 1, characterized in that, The post-curing process conditions include: humidity 50%-100%, and / or temperature 20℃-100℃.

3. The method for preparing the sound-absorbing component as described in claim 1, characterized in that, The granulation process includes one of the following: spray drying granulation, fluidized bed granulation, freeze drying granulation, and stirred granulation.

4. The method for preparing the sound-absorbing component as described in claim 1, characterized in that, The moisture-curing inorganic adhesive includes at least one of silicates, silica sols, aluminosilicates, phosphates, sulfates, and borates; And / or, the moisture-curing inorganic adhesive accounts for 1%-30% of the mass of the sound-absorbing particles.

5. The method for preparing the sound-absorbing component as described in claim 1, characterized in that, The porous material includes zeolite powder particles, wherein the silicon-to-aluminum mass ratio of the zeolite powder particles is less than 200, and the average particle size of the zeolite powder particles is greater than 10 μm.

6. The method for preparing the sound-absorbing component as described in claim 5, characterized in that, The zeolite powder particles have at least one of the crystal structures MOR, MFI, and FER.

7. The method for preparing the sound-absorbing component according to claim 1, characterized in that, The mixed slurry also includes reinforcing fillers, which include at least one of transparent powder, glass powder, silica, carbon black, talc, calcium carbonate, alumina, and aluminum hydroxide.

8. The method for preparing the sound-absorbing component according to claim 7, characterized in that, The particle size of the reinforcing filler is 0.01-5 μm.

9. The method for preparing the sound-absorbing component as described in claim 7, characterized in that, The reinforcing filler accounts for 5%-30% of the mass of the sound-absorbing particles.

10. The method for preparing the sound-absorbing element according to any one of claims 1-9, characterized in that, The sound-absorbing particles have a particle size of 100-700 μm.

11. The method for preparing the sound-absorbing element according to any one of claims 1-9, characterized in that, The pore volume of the sound-absorbing element is greater than 0.01 mL / g.

12. A sound-absorbing component, characterized in that, The sound-absorbing component is prepared by the method for preparing a sound-absorbing component as described in any one of claims 1-11.

13. A sound-generating device, characterized in that, The sound-generating device includes a housing, a sound-generating unit, and a sound-absorbing element as described in claim 12; The sound-generating unit is disposed within the housing, and the sound-generating unit and the housing cooperate to form a front acoustic cavity and a rear acoustic cavity, and the sound-absorbing component is disposed in the front acoustic cavity and / or the rear acoustic cavity.

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