CN116723444A - Sound absorbing part, preparation method thereof and sounding device - Google Patents
Sound absorbing part, preparation method thereof and sounding device Download PDFInfo
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- CN116723444A CN116723444A CN202310952732.XA CN202310952732A CN116723444A CN 116723444 A CN116723444 A CN 116723444A CN 202310952732 A CN202310952732 A CN 202310952732A CN 116723444 A CN116723444 A CN 116723444A
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- 239000002245 particle Substances 0.000 claims abstract description 135
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- 239000000853 adhesive Substances 0.000 claims abstract description 35
- 230000001070 adhesive effect Effects 0.000 claims abstract description 35
- 239000011268 mixed slurry Substances 0.000 claims abstract description 27
- 238000013008 moisture curing Methods 0.000 claims abstract description 24
- 238000011417 postcuring Methods 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 26
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 24
- 239000012763 reinforcing filler Substances 0.000 claims description 22
- 238000005469 granulation Methods 0.000 claims description 17
- 230000003179 granulation Effects 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- 239000010452 phosphate Substances 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 5
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 5
- 238000001694 spray drying Methods 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 239000000178 monomer Substances 0.000 description 19
- 238000012360 testing method Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 7
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- 238000001723 curing Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
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- 239000002904 solvent Substances 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 235000019241 carbon black Nutrition 0.000 description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The application discloses a sound absorbing piece, a preparation method thereof and a sound generating device, wherein the preparation method of the sound absorbing piece comprises the following steps: preparing mixed slurry, wherein the mixed slurry at least comprises a porous material and a moisture curing inorganic adhesive; granulating the mixed slurry to obtain sound-absorbing particles; and performing post-curing treatment on the sound-absorbing particles to obtain the sound-absorbing piece formed by bonding a plurality of sound-absorbing particles. The sound absorbing piece prepared by the application can effectively solve the problem that sound absorbing particles in the sound generating device are easy to generate broken powder in a high-power state, so that the sound generating device can still have higher low-frequency performance after high-power operation, and the durability and the service life of the sound generating device are improved.
Description
Technical Field
The application relates to the field of acoustics, in particular to a sound absorbing piece, a preparation method thereof and a sound generating device.
Background
In recent years, electronic products are increasingly lighter and thinner, so that the space reserved for the sound generating device is smaller and smaller, and therefore, the sound generating device gradually tends to be flattened, so that the volume of a sound cavity in the sound generating device is greatly reduced, and the low-frequency performance of the sound generating device is affected. In the related art, porous materials are filled into the acoustic cavity of the acoustic device, and the gas in the acoustic cavity of the acoustic device can be quickly adsorbed and desorbed by utilizing the pore canal structure in the porous materials, so that the effect of virtually increasing the resonance space of the acoustic cavity of the acoustic device is realized, the resonance frequency F0 of the acoustic device is effectively reduced, and the low-frequency sensitivity of the acoustic device is improved.
However, when the sound generating device is in a high-power working state, sound absorbing particles filled in the sound cavity of the sound generating device collide and rub with each other, and under the condition that deformation and crushing easily occur, crushed dust enters the sound generating unit, normal working of the sound generating unit is affected, so that the resonant frequency F0 is increased, and the low-frequency performance is reduced.
Disclosure of Invention
The application mainly aims to provide a sound absorbing piece, a preparation method thereof and a sound generating device, and aims to solve the technical problem that the low-frequency performance of the sound generating device in the related art is poor after high-power operation.
In order to achieve the above object, the present application provides a method for manufacturing a sound absorbing member, the method comprising the steps of:
preparing mixed slurry, wherein the mixed slurry at least comprises a porous material and a moisture curing inorganic adhesive;
granulating the mixed slurry to obtain sound-absorbing particles;
and performing post-curing treatment on the sound-absorbing particles to obtain the sound-absorbing piece formed by bonding a plurality of sound-absorbing particles.
Optionally, the step of performing post-curing treatment on the sound-absorbing particles to obtain a sound-absorbing member formed by bonding a plurality of sound-absorbing particles includes:
after the surface of the sound-absorbing particles is dried, filling the sound-absorbing particles into an acoustic cavity of the sound-producing device;
and performing post-curing treatment on the sound-absorbing particles in the sound cavity to obtain at least one sound-absorbing piece formed by bonding a plurality of sound-absorbing particles.
Optionally, the process conditions of the post-curing treatment include: humidity 50% -100%, and/or temperature 20 ℃ -100 ℃.
Optionally, the granulating comprises: spray drying granulation, boiling granulation, freeze drying granulation, stirring granulation.
Optionally, the moisture-curable inorganic adhesive includes at least one of silicate, silica sol, alumina sol, phosphate, sulfate, and borate;
and/or the mass ratio of the moisture curing inorganic adhesive in the sound absorbing particles is 1-30%.
Optionally, the porous material comprises zeolite particles, wherein the mass ratio of silicon to aluminum in the zeolite particles is less than 200, and the average particle size of the zeolite particles is more than 10 μm.
Optionally, the zeolite particles have at least one of the MOR, MFI, FER crystalline forms.
Optionally, the mixed slurry further comprises a reinforcing filler, wherein the reinforcing filler comprises at least one of transparent powder, glass powder, silicon dioxide, carbon black, talcum powder, calcium carbonate, aluminum oxide and aluminum hydroxide.
Optionally, the reinforcing filler has a particle size of 0.01-5 μm.
Optionally, the reinforcing filler accounts for 5% -30% of the mass of the sound-absorbing particles.
Optionally, the sound-absorbing particles have a particle size of 100-700 μm.
Optionally, the sound absorbing member includes at least one block-shaped sound absorbing structure composed of a plurality of the sound absorbing particles;
and/or the pore volume of the sound absorbing piece is larger than 0.01mL/g.
The application also provides a sound absorbing member, which is prepared by adopting the preparation method of the sound absorbing member.
The application also provides a sound generating device which comprises a shell, a sound generating monomer and the sound absorbing piece;
the sound-producing unit is arranged in the shell, the sound-producing unit is matched with the shell to form a front sound cavity and a rear sound cavity, and the sound-absorbing piece is arranged in the front sound cavity and/or the rear sound cavity.
The application provides a sound absorbing piece, a preparation method thereof and a sound generating device, wherein the preparation method of the sound absorbing piece comprises the following steps: preparing mixed slurry, wherein the mixed slurry at least comprises a porous material and a moisture curing inorganic adhesive; granulating the mixed slurry to obtain sound-absorbing particles; and performing post-curing treatment on the sound-absorbing particles to obtain the sound-absorbing piece formed by bonding a plurality of sound-absorbing particles. The porous material and the moisture curing inorganic adhesive are mixed to prepare the sound absorbing particles, and the sound absorbing particles are formed by adhering a plurality of porous materials, and the pore channel structure of the porous material is still reserved, so that the low-frequency performance of the sound generating device can be improved; furthermore, through post-curing treatment, a plurality of sound absorbing particles are bonded to form a whole sound absorbing piece, when the sound generating device is in a high-power working state, the sound absorbing particles are bonded together, so that the fluidity of the sound absorbing particles is limited, the friction collision among the sound absorbing particles can be effectively avoided, thereby greatly reducing the risk of crushing sound absorbing materials, overcoming the defect that when the sound generating device is in the high-power working state, the sound absorbing particles filled in the sound cavity of the sound generating device collide with each other for friction, the situation that deformation and crushing occur easily is avoided, crushed dust enters into sound generating monomers, the normal work of the sound generating monomers is influenced, the resonant frequency F0 is increased, and the technical defect of low-frequency performance reduction is caused, so that the sound generating device still has higher low-frequency performance after the high-power work, and the durability and the service life of the sound generating device are improved. In addition, after the sound-absorbing particles are formed in the method, the sound-absorbing particles can be filled into the sound cavity of the sound-producing device in a filling mode, and then the sound-absorbing particles are solidified to form the blocky sound-absorbing piece, so that the assembly efficiency of the sound-absorbing piece can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an embodiment of a method for manufacturing a sound absorbing member according to the present application;
fig. 2 is a schematic structural view of an embodiment of a sound absorbing member according to the present application;
fig. 3 is a schematic structural view of another alternative embodiment of the sound absorbing member according to the embodiment of the present application;
FIG. 4 is a graph showing the frequency response curves of the embodiment of the present application and the comparative example before the reliability test;
fig. 5 is a graph showing the frequency response curves of the inventive and comparative examples after the reliability test.
Description of the embodiments reference numerals:
| 10 | sound absorbing member | 11 | Sound absorbing particles |
| 20 | Shell body | 30 | Sounding monomer |
| 40 | Acoustic rear cavity |
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, the following description of the embodiments accompanied with the accompanying drawings will be given in detail. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In an embodiment of the method for manufacturing a sound absorbing member according to the present application, referring to fig. 1, the method for manufacturing a sound absorbing member includes the following steps:
step S10, preparing mixed slurry, wherein the mixed slurry at least comprises a porous material and a moisture curing inorganic adhesive;
in this embodiment, the porous material refers to a material having a network structure formed by mutually penetrating pores, and the porous material includes a mixture of one or more of activated carbon, zeolite powder, activated silica, porous alumina, and molecular sieve. Compared with a continuous medium material, the porous material has the advantages of low relative density, high specific strength, high specific surface area, light weight, sound insulation, heat insulation, good permeability and the like, and the gas in the acoustic cavity of the acoustic device can be quickly adsorbed and desorbed by utilizing the pore channel structure in the porous material, so that the virtual increase effect of the resonance space of the acoustic cavity of the acoustic device is realized, the resonance frequency F0 of the acoustic device is effectively reduced, and the low-frequency sensitivity of the acoustic device is improved. However, the pore wall of the porous material is thinner, when the sound generating device is in a high-power working state, sound absorbing particles filled in the sound cavity of the sound generating device collide with each other and rub, so that under the condition that deformation and crushing easily occur, crushed dust enters the sound generating unit, normal work of the sound generating unit is influenced, the resonant frequency F0 is increased, and the low-frequency performance is reduced.
Optionally, the porous material comprises zeolite particles, wherein the mass ratio of silicon to aluminum in the zeolite particles is less than 200, and the average particle size of the zeolite particles is more than 10 μm.
In this embodiment, the zeolite particles have more pores and a wider pore size distribution, that is, the zeolite particles generally include multiple pore sizes, which is more beneficial to improving the acoustic performance of the sound generating device. The particle size of the porous material is too small, the finely divided porous material is easy to leave in the preparation process, the finely divided porous material is easy to generate in the processing and using process of the sound absorbing piece, the finely divided porous material possibly enters the sounding monomer to influence the normal work of the sounding monomer, the resonance frequency F0 is increased, the low-frequency performance is reduced, and therefore the average particle size of the zeolite particles is determined to be larger than 10 mu m. The zeolite particles with the silicon-aluminum mass ratio smaller than 200 contain rich aluminum, can be better combined with inorganic adhesives, and promote the bonding strength among the zeolite particles to be higher; alternatively, the zeolite particles may have an average particle size of 11 μm, 13 μm, 15 μm, 18 μm, etc., and the mass ratio of silica to alumina in the zeolite particles may be 100, 120, 150, 180, etc.
Optionally, the zeolite particles have at least one of the MOR, MFI, FER crystalline forms.
In this embodiment, the difference of the crystal forms can affect the ability of the zeolite particles to adsorb and desorb air molecules, and the zeolite particles having at least one of MOR, MFI and FAU crystal forms can provide a pore channel structure beneficial to the adsorption and desorption of air molecules, and have a regular structure and higher sound absorption performance.
The moisture-curable inorganic adhesive is an inorganic adhesive which can form a polymer material with high strength and durability by cross-linking reaction through absorbing moisture at a lower temperature, and comprises at least one of silicate, silica sol, alumina sol, phosphate, sulfate, borate and the like. The curing temperature of the moisture curing inorganic adhesive is lower and is generally lower than 100 ℃, the lower curing temperature cannot damage sounding monomers or adversely affect performance of sounding monomers, therefore, the preparation mode is more selective, sound absorbing pieces can be prepared independently and assembled into the sound cavity of the sounding device, the sound absorbing pieces can be filled into the sound cavity of the sounding device in a filling mode after sound absorbing particles are formed, and then the sound absorbing pieces are cured to form blocky sound absorbing pieces after the sound absorbing particles are formed, so that the assembly efficiency of the sound absorbing pieces can be improved.
Optionally, the moisture-curable inorganic adhesive includes at least one of silicate, silica sol, alumina sol, phosphate, sulfate, and borate;
and/or the mass ratio of the moisture curing inorganic adhesive in the sound absorbing particles is 1-30%.
In this embodiment, the moisture-curable inorganic adhesive includes at least one of silicate, silica sol, alumina sol, phosphate, sulfate, and borate. If the addition amount of the moisture curing inorganic adhesive is too small, the adhesion between porous materials is poor, and the strength of the sound absorbing piece formed by adhesion is poor and the sound absorbing piece is easy to crack; if the addition amount of the moisture curing inorganic adhesive is too large, the pore channels on the surface of the porous material can be blocked, and the acoustic performance of the sound generating device is affected. The mass ratio of the moisture-curable inorganic adhesive in the sound-absorbing particles is thus determined to be 1% to 30%, for example, 1%, 5%, 10%, 15%, 20%, 25%, 30%, etc.
Optionally, the mixed slurry further comprises a reinforcing filler, wherein the reinforcing filler comprises at least one of transparent powder, glass powder, silicon dioxide, carbon black, talcum powder, calcium carbonate, aluminum oxide and aluminum hydroxide.
In this embodiment, a reinforcing filler, which is a filler having a reinforcing effect on the sound absorbing member structure, may be added to the mixed slurry, and includes at least one of transparent powder, glass frit, silica, carbon black, talc, calcium carbonate, alumina, aluminum hydroxide, and the like. The structural gaps among the porous materials are properly filled, the strength of the sound absorbing piece is improved, when the sound generating device is in a high-power working state, the sound absorbing piece can better resist high-strength collision and friction, the breakage rate of the sound absorbing piece is reduced, broken dust is prevented from entering a sound generating unit, normal work of the sound generating unit is influenced, the resonant frequency F0 is increased, and the low-frequency performance is reduced.
Optionally, the reinforcing filler has a particle size of 0.01-5 μm.
In this embodiment, if the particle size of the reinforcing filler is too large, it is difficult to fill the gaps between the porous materials, the reinforcing effect is poor, and if the particle size of the reinforcing filler is too small, the reinforcing filler is easy to agglomerate and not easy to disperse in the solution, and the pore channels of the porous materials are easy to be blocked, so that the acoustic performance of the sound generating device is affected. Thus, the particle size of the reinforcing filler is determined to be 0.01 to 5. Mu.m, for example, 0.01. Mu.m, 0.1. Mu.m, 0.5. Mu.m, 1. Mu.m, 2. Mu.m, 3. Mu.m, 4. Mu.m, 5. Mu.m, etc.
Optionally, the reinforcing filler accounts for 5% -30% of the mass of the sound-absorbing particles.
In this embodiment, if the addition amount of the reinforcing filler is too small, the reinforcing effect is poor, and if the addition amount of the reinforcing filler is too large, the mass ratio of the porous sound absorbing material is relatively reduced, the pore structure is relatively reduced, and the acoustic performance of the sound generating device is affected. The mass ratio of the reinforcing filler in the sound-absorbing particles is thus determined to be 5% -30%, for example 5%, 10%, 15%, 20%, 25%, 30%, etc.
Illustratively, the step S10 includes: the raw material types and the raw material proportions of various raw materials for preparing the sound absorbing member can be determined in advance according to the product requirements, and the various raw materials are weighed according to the raw material proportions, wherein the raw materials at least comprise porous materials and moisture curing inorganic adhesives. And adding the weighed various raw materials into a solvent, and uniformly mixing to obtain mixed slurry. In one embodiment, the solvent may be water.
Step S20, granulating the mixed slurry to obtain sound-absorbing particles;
illustratively, the step S20 includes: after the porous material and the moisture-curing inorganic adhesive are uniformly mixed by using a solvent, the solvent in the mixed slurry can be removed by means of heating, drying, freeze drying, spray drying and the like, and in the granulating process, the moisture-curing inorganic adhesive can connect a plurality of porous materials to form sound-absorbing particles.
Optionally, the granulating comprises: spray drying granulation, boiling granulation, freeze drying granulation, stirring granulation.
In this example, the mixed slurry may be granulated by spray drying granulation, boiling granulation, freeze drying granulation, or stirring granulation to obtain sound absorbing particles. Optionally, the sound-absorbing particles have a particle size of 100-700 μm.
In this embodiment, if the particle size of the sound-absorbing particles is too large, there are few connection sites at the time of post-curing treatment, the connection tightness between the formed sound-absorbing members is low, and the sound-absorbing members are easily broken under high-strength collision and friction; if the particle size of the sound absorbing particles is too small, dust with smaller particle size is easily generated due to carry-over or crushing in the processing or using process, and enters the sounding monomer, so that the normal operation of the sounding monomer can be influenced, the resonant frequency F0 is increased, and the low-frequency performance is reduced. Thus, the particle diameter of the sound-absorbing particles is determined to be 100 to 700 μm, for example, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, etc.
And step S30, performing post-curing treatment on the sound-absorbing particles to obtain the sound-absorbing piece formed by bonding a plurality of sound-absorbing particles.
Illustratively, the step S30 includes: the sound-absorbing particles are placed in an environment with certain temperature and humidity, so that moisture in the environment is absorbed by the moisture-curing inorganic adhesive in the sound-absorbing particles, and crosslinking occurs at a lower temperature, so that a plurality of sound-absorbing particles are bonded into one or more block-shaped sound-absorbing structures, and the formed one or more block-shaped structures can be used as sound-absorbing pieces. The temperature and humidity of the post-curing treatment should be such that the moisture curing inorganic adhesive can crosslink and ensure that the sounding monomer is not damaged, and the post-curing treatment can be specifically determined according to practical situations, which is not limited in this embodiment. Compared with the sound absorption particles filled in the sound cavity of the sound production device, the whole block sound absorption structure is filled, free flow among the sound absorption particles can be reduced, collision friction among the sound absorption particles is avoided, the risk of breakage of sound absorption materials is greatly reduced, and the durability and the service life of the sound absorption device are improved.
Optionally, the step of performing post-curing treatment on the sound-absorbing particles to obtain a sound-absorbing member formed by bonding a plurality of sound-absorbing particles includes:
step S31, after the surfaces of the sound-absorbing particles are dried, filling the sound-absorbing particles into an acoustic cavity of the sound-producing device;
and step S32, performing post-curing treatment on the sound-absorbing particles in the sound cavity to obtain at least one sound-absorbing piece formed by bonding a plurality of sound-absorbing particles.
In this embodiment, the curing temperature of the moisture curing inorganic adhesive is lower, usually less than 100 ℃, and the lower curing temperature does not damage the sounding monomer, and does not adversely affect the performance of the sounding monomer, so that the moisture curing inorganic adhesive can be filled into the sound cavity of the sounding device in a filling manner after the sound-absorbing particles are formed, and then the sound-absorbing particles are cured to form a blocky sound-absorbing member, so that the assembly efficiency of the sound-absorbing member can be improved.
The sounding monomer and the shell of the sounding device can be assembled in advance, and an acoustic cavity is formed between the sounding monomer and the shell.
Illustratively, the steps S31-S32 include: after the sound-absorbing particles are obtained through granulation, and the surfaces of the sound-absorbing particles are dried, the sound-absorbing particles can be filled into an acoustic cavity of a sound-producing device which is prepared in advance, the sound-producing device filled with the sound-absorbing particles is placed in an environment with certain temperature and humidity, so that moisture in the environment is absorbed by the moisture-curing inorganic adhesive in the sound-absorbing particles, and cross-linking occurs in the acoustic cavity, and a plurality of sound-absorbing particles are bonded into one or a plurality of blocky sound-absorbing pieces.
In one embodiment, referring to fig. 2 and 3, the sound-emitting unit 30 and the housing 20 may be assembled into a sound-emitting device, and the sound-absorbing particles 11 may be filled into the sound-emitting device 40 prepared in advance, and the sound-emitting device filled with the sound-absorbing particles 11 may be placed in an environment with a certain temperature and humidity, so that the moisture-curable inorganic adhesive in the sound-absorbing particles 11 absorbs moisture in the environment, thereby cross-linking occurs in the sound-emitting device 40, and the sound-absorbing particles 11 may be bonded into one monolithic sound-absorbing member as shown in fig. 2, or a plurality of monolithic sound-absorbing members as shown in fig. 3.
The sound absorbing member 10 includes at least one block-shaped sound absorbing structure composed of a plurality of the sound absorbing particles 11
Optionally, the process conditions of the post-curing treatment include: humidity 50% -100%, and/or temperature 20 ℃ -100 ℃.
In this embodiment, in an environment having a humidity of 50% to 100%, for example, an environment having a humidity of 50%, 60%, 70%, 80%, 90%, 100%, or the like, the moisture-curable inorganic adhesive can absorb moisture in the environment and crosslink. In an environment with the temperature of 20-100 ℃, for example, the environment with the temperature of 20 ℃, 40 ℃, 60 ℃, 80 ℃, 100 ℃ and the like, the moisture curing inorganic adhesive can absorb moisture in the environment to crosslink, and can not damage sounding monomers or adversely affect the performance of the sounding monomers.
Optionally, the sound absorbing member includes at least one block-shaped sound absorbing structure composed of a plurality of the sound absorbing particles;
and/or the pore volume of the sound absorbing piece is larger than 0.01mL/g.
In this embodiment, the sound absorbing member may be a monolithic block sound absorbing structure composed of a plurality of the sound absorbing particles, or may include a plurality of block sound absorbing structures composed of a plurality of the sound absorbing particles. The number and the size of the block sound-absorbing structures in the sound-absorbing member should ensure that the sound-absorbing member has a sufficient duct structure to improve the acoustic performance of the sound-producing device, and the sound-producing device is not easy to deform and break when in a high-power working state, and can be determined according to actual conditions, actual acoustic performance test results and the like. The pore volume of the sound absorbing piece is larger than 0.01mL/g, so that gas in the sound cavity of the sound generating device can be quickly adsorbed and desorbed, the effect of virtual increase of the resonance space of the sound cavity of the sound generating device is realized, the resonance frequency F0 of the sound generating device is effectively reduced, the low-frequency sensitivity of the sound generating device is improved, and the sound generating device is ensured to have relatively excellent acoustic performance.
In this embodiment, the method for manufacturing the sound absorbing member includes the steps of: preparing mixed slurry, wherein the mixed slurry at least comprises a porous material and a moisture curing inorganic adhesive; granulating the mixed slurry to obtain sound-absorbing particles; and performing post-curing treatment on the sound-absorbing particles to obtain the sound-absorbing piece formed by bonding a plurality of sound-absorbing particles. The porous material and the moisture curing inorganic adhesive are mixed to prepare the sound absorbing particles, and the sound absorbing particles are formed by adhering a plurality of porous materials, and the pore channel structure of the porous material is still reserved, so that the low-frequency performance of the sound generating device can be improved; furthermore, through post-curing treatment, a plurality of sound absorbing particles are bonded to form a whole sound absorbing piece, when the sound generating device is in a high-power working state, the sound absorbing particles are bonded together, so that the fluidity of the sound absorbing particles is limited, the friction collision among the sound absorbing particles can be effectively avoided, thereby greatly reducing the risk of crushing sound absorbing materials, overcoming the defect that when the sound generating device is in the high-power working state, the sound absorbing particles filled in the sound cavity of the sound generating device collide with each other for friction, the situation that deformation and crushing occur easily is avoided, crushed dust enters into sound generating monomers, the normal work of the sound generating monomers is influenced, the resonant frequency F0 is increased, and the technical defect of low-frequency performance reduction is caused, so that the sound generating device still has higher low-frequency performance after the high-power work, and the durability and the service life of the sound generating device are improved. In addition, after the sound-absorbing particles are formed in the method, the sound-absorbing particles can be filled into the sound cavity of the sound-producing device in a filling mode, and then the sound-absorbing particles are solidified to form the blocky sound-absorbing piece, so that the assembly efficiency of the sound-absorbing piece can be improved.
Further, the application also provides a sound absorbing member, which is prepared by adopting the preparation method of the sound absorbing member.
The sound absorbing piece solves the technical problem that the low-frequency performance of the sound generating device in the related art is poor after high-power operation, namely the sound absorbing particles in the sound generating device are extremely easy to generate broken powder in a high-frequency state. Compared with the prior art, the sound absorbing member provided by the embodiment of the application has the same beneficial effects as the sound absorbing member preparation method of the embodiment, and the description is omitted herein.
Further, the application also provides a sound generating device, which comprises a shell, a sound generating unit and the sound absorbing piece in the embodiment;
the sound-producing unit is arranged in the shell, the sound-producing unit is matched with the shell to form a front sound cavity and a rear sound cavity, and the sound-absorbing piece is arranged in the front sound cavity and/or the rear sound cavity.
The sounding device provided by the application solves the technical problem that the low-frequency performance of the sounding device in the related art is poor after high-power operation. Compared with the prior art, the sound generating device provided by the embodiment of the application has the same beneficial effects as the shell of the embodiment, and the description is omitted here.
The housing of the present application will be described in detail with specific examples and comparative examples. It is to be understood that the following description is exemplary only and is not intended to limit the application in any way.
Examples
The method comprises the steps of selecting zeolite powder particles as porous materials, using phosphate as a moisture curing inorganic adhesive, adding transparent powder with the mass ratio of 10% as a reinforcing filler, adding the raw materials into water, uniformly mixing, preparing mixed slurry, granulating to obtain sound-absorbing particles, filling the sound-absorbing particles into an acoustic rear cavity of a sound-producing device after the surfaces of the sound-absorbing particles are dried, placing the sound-producing device and the sound-absorbing particles together in an environment with the temperature of 85 ℃ and the humidity of 95% for curing for 48 hours, and promoting the sound-absorbing particles to be bonded into an integral sound-absorbing piece, so as to obtain the sound-producing device containing the sound-absorbing piece in the acoustic rear cavity.
Comparative example
The method comprises the steps of selecting zeolite particles as a porous material, using epoxy resin as an adhesive, adding transparent powder with the mass ratio of 10% as a reinforcing filler, adding the raw materials into water, uniformly mixing, preparing mixed slurry, granulating to obtain sound-absorbing particles, filling the sound-absorbing particles after solidification into an acoustic rear cavity of the sound-producing device, and obtaining the sound-producing device with the sound-absorbing particles in the acoustic rear cavity.
The sound emitting devices prepared in the examples and the comparative examples were subjected to a frequency response curve test before the reliability test, and the test results before the reliability test are shown in fig. 4; further, reliability tests were performed on the sound emitting devices prepared in examples and comparative examples, after which the sound emitting device was tested for F0, and disassembled, and the breakage of the sound absorbing member was observed, the test results are shown in table 1, and the sound emitting devices prepared in examples and comparative examples were again subjected to a frequency response curve test, and the test results after the reliability tests are shown in fig. 5. The experimental condition of the reliability experiment is that the temperature is 65 ℃, the voltage is 3.5V, the powder is noisy in the 95% RH environment, and the power is continuously electrified for 120 hours.
TABLE 1
As can be seen from fig. 4, the F0 approaches for the examples and comparative examples, indicating that the sound-absorbing particles are bonded as a whole after the post-curing treatment without loss of acoustic properties.
As can be seen from table 1 and fig. 5, the change of F0 after the reliability test is small, while the rise of F0 after the reliability test is large, and the breakage and powder falling of the sound absorbing member of the comparative example are serious, which means that the sound absorbing particles are bonded into a whole, the free flow between the sound absorbing particles is restricted, the collision friction between the sound absorbing particles is avoided, and the risk of breakage of the sound absorbing member is reduced.
The foregoing description of the preferred embodiments of the present application should not be construed as limiting the scope of the application, but rather utilizing equivalent structural changes made in the present application description and drawings or directly/indirectly applied to other related technical fields are included in the scope of the present application.
Claims (14)
1. A method for producing a sound absorbing member, comprising the steps of:
preparing mixed slurry, wherein the mixed slurry at least comprises a porous material and a moisture curing inorganic adhesive;
granulating the mixed slurry to obtain sound-absorbing particles;
and performing post-curing treatment on the sound-absorbing particles to obtain the sound-absorbing piece formed by bonding a plurality of sound-absorbing particles.
2. The method of producing a sound absorbing member according to claim 1, wherein the step of subjecting the sound absorbing particles to post-curing treatment to obtain a sound absorbing member formed by bonding a plurality of sound absorbing particles comprises:
after the surface of the sound-absorbing particles is dried, filling the sound-absorbing particles into an acoustic cavity of the sound-producing device;
and performing post-curing treatment on the sound-absorbing particles in the sound cavity to obtain at least one sound-absorbing piece formed by bonding a plurality of sound-absorbing particles.
3. The method of producing a sound absorbing member according to claim 1, wherein the post-curing treatment process conditions include: humidity 50% -100%, and/or temperature 20 ℃ -100 ℃.
4. The method of producing a sound absorbing member according to claim 1, wherein the granulating comprises: spray drying granulation, boiling granulation, freeze drying granulation, stirring granulation.
5. The method of producing a sound absorbing member according to claim 1, wherein the moisture-curable inorganic adhesive comprises at least one of silicate, silica sol, alumina sol, phosphate, sulfate, and borate;
and/or the mass ratio of the moisture curing inorganic adhesive in the sound absorbing particles is 1-30%.
6. The method of producing a sound absorbing member according to claim 1, wherein the porous material comprises zeolite particles, the mass ratio of silica to alumina in the zeolite particles is less than 200, and the average particle size of the zeolite particles is more than 10 μm.
7. The method of producing a sound absorbing member of claim 6, wherein the zeolite particles have at least one of MOR, MFI, FER crystal form structures.
8. The method of producing a sound absorbing member of claim 1, wherein the mixed slurry further comprises a reinforcing filler, the reinforcing filler comprising at least one of transparent powder, glass frit, silica, carbon black, talc, calcium carbonate, alumina, and aluminum hydroxide.
9. The method for producing a sound absorbing member according to claim 8, wherein the reinforcing filler has a particle diameter of 0.01 to 5 μm.
10. The method of producing a sound absorbing member according to claim 8, wherein the reinforcing filler is present in the sound absorbing particles in an amount of 5 to 30% by mass.
11. The method of producing a sound absorbing member according to any one of claims 1 to 10, wherein the sound absorbing particles have a particle diameter of 100 to 700 μm.
12. The method of producing a sound absorbing member according to any one of claims 1 to 10, wherein the sound absorbing member comprises at least one block-shaped sound absorbing structure composed of a plurality of the sound absorbing particles;
and/or the pore volume of the sound absorbing piece is larger than 0.01mL/g.
13. A sound absorbing member, characterized in that the sound absorbing member is produced by the method for producing a sound absorbing member according to any one of claims 1 to 12.
14. A sound generating device, characterized in that the sound generating device comprises a housing, a sound generating unit and the sound absorbing member according to claim 13;
the sound-producing unit is arranged in the shell, the sound-producing unit is matched with the shell to form a front sound cavity and a rear sound cavity, and the sound-absorbing piece is arranged in the front sound cavity and/or the rear sound cavity.
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| CN118102194A (en) * | 2024-04-25 | 2024-05-28 | 歌尔股份有限公司 | Sound absorption block, preparation method thereof, sounding module and electronic equipment |
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| CN118102194A (en) * | 2024-04-25 | 2024-05-28 | 歌尔股份有限公司 | Sound absorption block, preparation method thereof, sounding module and electronic equipment |
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