CN118271796A - Sound absorption composite material and preparation method and application thereof - Google Patents
Sound absorption composite material and preparation method and application thereof Download PDFInfo
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- CN118271796A CN118271796A CN202211736265.9A CN202211736265A CN118271796A CN 118271796 A CN118271796 A CN 118271796A CN 202211736265 A CN202211736265 A CN 202211736265A CN 118271796 A CN118271796 A CN 118271796A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 79
- 238000002360 preparation method Methods 0.000 title claims abstract description 34
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Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a sound absorption composite material and a preparation method and application thereof. The sound absorption composite material comprises a composite foam matrix and a rubber-based structural member; wherein, the preparation raw materials of the composite foam matrix comprise: hollow microspheres and resin-based materials; the preparation raw materials of the rubber-based structural member comprise: rubber-based materials and fillers. The composite material has good compressive strength and sound absorption performance, can obviously improve the rigidity of the sound absorption material, keeps excellent sound absorption performance under the action of water pressure, and effectively solves the problem of the sound absorption performance reduction of the rubber material when the rubber material receives the water pressure.
Description
Technical Field
The invention belongs to the field of sound absorption materials, and particularly relates to a sound absorption composite material, and a preparation method and application thereof.
Background
In the prior art, the silencing tile is mature underwater equipment sonar detection equipment, and the silencing tile is consumed by converting sound into heat energy by utilizing a cavity, but has the defects of complex construction method, extra thickness, weight and the like, so that the application range of the silencing tile is greatly limited. The acoustic characteristic control technology of the underwater equipment is a comprehensive application technology, and the sound absorption material is required to have multiple performances under the water environment. The existing underwater sound absorption materials mainly comprise rubber and polyurethane sound absorption materials, and in order to enhance the absorption of sound waves in specific frequency bands, cavity structures with specific shapes are arranged in the materials to form a resonance structure, but as the water pressure increases, the cavities cannot maintain the original shapes, so that the impedance mismatch between the whole material and water is caused, the natural frequency of the cavities is changed, and the sound absorption performance is reduced. When sound waves are incident into thicker high-loss sound absorbing materials, the loss can cause frequency changes, causing impedance mismatch. In order to solve the problem, a gradual-change sound absorbing structure is generally prepared from a sound absorbing material such as rubber, and the structure can effectively improve the reflection problem caused by impedance mismatch, but the rubber material also has creep under the action of water pressure, so that the acoustic performance is influenced.
The prior art CN 110534083A discloses a three-phase composite structure sound absorption material, a preparation method and application thereof, and belongs to the technical field of sound absorption materials. The polyurethane matrix filled with the hollow microspheres is compounded with the 3D spacer fabric, the obtained three-phase composite structure sound absorption material has the characteristics of a cavity resonance sound absorption material and a particle filled sound absorption material, meanwhile, micro-perforations with the aperture being the diameter of the spacer wires and filled with the spacer wires are formed in the material by adding the 3D spacer fabric, the medium-low frequency sound absorption performance of the material is further improved, and the mechanical property of the material can be obviously improved by the good buffering performance of the 3D spacer fabric. In water, the average sound absorption coefficient is 0.31 in the range of 300 Hz-4000 Hz, the average sound absorption coefficient is 0.48 in the range of 800-1200 Hz, the highest sound absorption coefficient is 0.75, and the second absorption peak is in the range of 3800-4000 Hz. However, this document does not address the water pressure resistance and the sound absorption coefficient under water pressure of the material.
The prior art CN109836773A discloses an underwater acoustic composite material with strength and sound absorption performance, which comprises a pressure-resistant sound absorption foam material and a fiber reinforced material, wherein rubber filler, sound absorption filler and hollow filler are added, and the composite material is formed by foaming, curing and shaping. The obtained underwater acoustic composite material has the characteristics of light weight, high specific strength, strong designability, excellent sound absorption performance and the like, can replace sound absorption rubber to manufacture various sound absorption structural members, and can be used underwater safely and reliably. However, the method does not pay attention to the sound absorption performance of underwater low frequency and broadband, has general hydrostatic pressure resistance, and is complex in preparation method and unfavorable for engineering application.
Disclosure of Invention
The invention provides a sound absorption composite material, which comprises a composite foam matrix and a rubber-based structural member; wherein,
The preparation raw materials of the composite foam matrix comprise: hollow microspheres and resin-based materials;
the preparation raw materials of the rubber-based structural member comprise: rubber-based materials and fillers.
According to an embodiment of the invention, the rubber-based structural members are distributed, preferably in an array, in the syntactic foam matrix, for example at a distribution pitch of 20-100mm, illustratively 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm.
According to an embodiment of the invention, the rubber-based structure has a cavity. Further, the shape of the cavity can be cylindrical, spherical, conical or square, etc. In some embodiments, the ratio of the volume of the cavity to the rubber-based structure (i.e., the perforation rate) is 10-80%, such as 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or 80%.
According to an embodiment of the invention, the rubber-based structural members are distributed, preferably in an array, in the syntactic foam matrix, and the cavities are not filled by the syntactic foam matrix.
According to an embodiment of the invention, the density of the syntactic foam matrix is 0.25 to 0.8g/cm 3, such as 0.25g/cm3、0.3g/cm3、0.35g/cm3、0.4g/cm3、0.45g/cm3、0.5g/cm3、0.55g/cm3、0.6g/cm3、0.65g/cm3、0.7g/cm3、0.75g/cm3 or 0.8g/cm 3.
According to an embodiment of the invention, the isostatic failure strength of the syntactic foam matrix is in the range of 1 to 190MPa, for example 1MPa, 10MPa, 20MPa, 30MPa, 50MPa, 70MPa, 90MPa, 100MPa, 120MPa, 150MPa, 170MPa or 190MPa.
According to an embodiment of the present invention, the resin in the resin-based material may be selected from one or more of epoxy resins, phenolic resins, polyurethane resins, and unsaturated resins.
According to an embodiment of the invention, the resin-based material is prepared from a resin and optionally an auxiliary agent. Wherein the auxiliary agent is selected from one or more of a coupling agent, a curing agent, an accelerator, an initiator, a diluent and the like.
According to an embodiment of the present invention, the preparation raw material of the syntactic foam matrix may further include fibers. The fibers are used to reinforce and toughen the composite, illustratively including one or more of carbon fibers, glass fibers, nylon fibers, and the like.
Specifically, the resin-based material is used as an adhesive to bond and shape the hollow microspheres and the fibers, and the composite foam matrix is suitable for underwater use.
According to an embodiment of the present invention, the hollow microspheres may be selected from one or more of hollow glass microspheres, hollow polymer microspheres, hollow ceramic microspheres, hollow carbon microspheres, and the like. The hollow microspheres serve as a density regulator to reduce the density of the sound absorption composite material.
According to an embodiment of the present invention, the preparation raw materials of the syntactic foam matrix include, in parts by mass: 100 parts by mass of resin-based material, 10-90 parts by mass of hollow microspheres and 0-4 parts by mass of fiber; preferably, the preparation raw materials comprise: 100 parts by mass of resin-based material, 20-60 parts by mass of hollow microspheres and 0-4 parts by mass of fiber. For example, the hollow microsphere is 25, 30, 32, 35, 40, 46, 50 or 55 parts by mass; for example, the mass part of the fiber is 1,2 or 3.
According to the embodiment of the invention, the rubber in the rubber-based material is selected from one or more of rubber with high loss to sound waves, such as natural rubber, butadiene rubber, styrene-butadiene rubber, butyl rubber, nitrile rubber and the like. Furthermore, the rubber-based material also comprises at least one of an active agent, an anti-aging agent, a coupling agent, a softening agent, a vulcanizing agent and an accelerator, which are all commonly used auxiliary agents in the existing rubber-based material.
According to an embodiment of the invention, the filler is used to enhance the sound absorption properties of the sound absorbing composite, for example one or more selected from the group consisting of vermiculite powder, hollow glass microbeads, carbon fibers, and the like.
Preferably, the hollow microspheres and the filler are hollow glass microspheres. Also preferably, the hollow glass microspheres do not exceed 0.80g/cm 3, such as do not exceed 0.70g/cm 3, which may be exemplified 0.20g/cm3、0.25g/cm3、0.30g/cm3、0.38g/cm3、0.46g/cm3、0.50g/cm3.
According to an embodiment of the present invention, the rubber-based structural member is prepared from the following raw materials in parts by mass: 100 parts by mass of rubber and 5-60 parts by mass of filler; preferably, the preparation raw materials comprise: 100 parts by mass of rubber and 10-40 parts by mass of filler. As an example, the filler may be 15, 20, 30, 35, 40, 45, 50, or 55 parts by mass.
According to an embodiment of the invention, the height of the rubber-based structure does not exceed the height of the syntactic foam matrix, preferably is smaller than the height of the syntactic foam matrix, e.g. the difference in height is not smaller than 2mm.
According to an embodiment of the invention, the sound absorbing composite comprises a syntactic foam matrix and a rubber-based structure; wherein,
The preparation raw materials of the composite foam matrix comprise: hollow microspheres and resin-based materials;
the preparation raw materials of the rubber-based structural member comprise: rubber-based materials and fillers;
Preferably, the hollow microspheres and the filler are hollow glass microspheres;
The rubber-based structure has a cavity, preferably the volume ratio of the cavity to the rubber-based structure is 10-80%;
The rubber-based structural members are distributed in the composite foam matrix in an array manner, and the cavities are not filled by the composite foam matrix;
The height of the rubber-based structure does not exceed the height of the syntactic foam matrix.
According to an embodiment of the invention, the sound absorbing composite further comprises a sealing plate for closing the rubber-based structure. In some embodiments, the gasket is the same material as the syntactic foam substrate.
According to embodiments of the invention, the density of the sound absorbing composite is 0.3 to 0.9g/cm 3, such as 0.3g/cm3、0.4g/cm3、0.5g/cm3、0.6g/cm3、0.7g/cm3、0.8g/cm3 or 0.9g/cm 3.
According to an embodiment of the invention, the pressure resistance of the sound absorbing composite is 3 to 40MPa, for example 3MPa, 5MPa, 10MPa, 15MPa, 20MPa, 25MPa, 30MPa, 35MPa or 40MPa.
According to an embodiment of the invention, the underwater average sound absorption coefficient of the sound absorption composite material is 0.6-0.8 (6 MPa water pressure, 200Hz-30 kHz).
The invention also provides a preparation method of the sound absorption composite material, which comprises the following steps: fixing a rubber-based structural member at the bottom of a mold, pouring a premix of a composite foam matrix into the mold, curing, and demolding to obtain the sound absorption composite material;
The premix of the composite foam matrix is obtained by mixing preparation raw materials of the composite foam matrix.
Preferably, the preparation raw materials of the composite foam matrix are selected and the mass ratio is as shown above.
Preferably, the rubber-based structure is a rubber structure having a cavity.
Preferably, the rubber-based structure is fixed to the bottom of the mold in an array.
According to an embodiment of the present invention, the process for preparing the rubber-based structural member comprises: adding filler (and optionally other additives except for a vulcanizing agent and an accelerator) into molten rubber, banburying, mixing, pouring into a mould (such as a cavity mould), vulcanizing (the vulcanizing agent and the accelerator can be added), and demolding to obtain the rubber-based structural member; preferably, the rubber-based material and the filler are selected and mixed according to the mass ratio as shown above.
According to an embodiment of the invention, the fixing of the rubber-based structure to the bottom of the mould may be by adhesive bonding.
According to the embodiment of the invention, the height of the premix injection mold is larger than that of the rubber-based structural member, and the difference between the height of the premix injection mold and the height of the rubber-based structural member is not smaller than 2mm.
According to an embodiment of the invention, the preparation method further comprises the steps of: and sealing the rubber-based structural part in the demolded material by using a sealing plate.
The invention also provides another preparation method of the sound absorption composite material, which comprises the following steps: preparing or preparing a composite foam matrix with a pore structure, and fixing a rubber-based structural member in the pore structure to obtain the sound absorption composite material.
Preferably, the pore structure is an array pore structure.
Preferably, the holes in the hole structure are through holes or non-through holes, preferably non-through holes.
According to an embodiment of the present invention, the composite foam matrix is prepared by mixing preparation raw materials of the composite foam matrix in a mold having a pore structure. Preferably, the preparation raw materials of the composite foam matrix are selected and the mass ratio is as shown above.
According to an embodiment of the present invention, the process for preparing the rubber-based structural member comprises: adding filler (and optionally other additives except for a vulcanizing agent and an accelerator) into molten rubber, banburying, mixing, pouring into a mould (such as a cavity mould), vulcanizing (the vulcanizing agent and the accelerator can be added), and demolding to obtain the rubber-based structural member; preferably, the rubber-based material and the filler are selected and mixed according to the mass ratio as shown above.
According to an embodiment of the invention, the fixation of the rubber-based structure in the hole structure may be fixed by adhesive bonding.
According to an embodiment of the invention, the preparation method further comprises the steps of: the rubber-based structural member fixed in the hole structure is closed with a sealing plate.
The invention also provides the use of the above sound absorbing composite in an underwater device, such as an underwater vehicle.
The beneficial effects are that:
the underwater acoustic composite material provided by the invention has good compressive strength and sound absorption performance, can obviously improve the rigidity of the sound absorption material, keeps excellent sound absorption performance under the action of water pressure, and effectively solves the problem of sound absorption performance reduction of rubber materials when the rubber materials are subjected to water pressure. The method has the specific advantages that:
1. the deformation of the internal rubber-based structural member in the hydraulic environment is small through the light pressure-resistant composite foam matrix, and meanwhile, the internal rubber-based structural member still has higher sound loss capacity, and the average sound absorption coefficient reaches 0.7.
2. The cavity inside the rubber-based structural member can enhance the sound absorption performance of the underwater acoustic composite material, and hollow microspheres are added into both the light pressure-resistant composite foam matrix and the rubber-based structural member, so that the composite foam matrix has the characteristics of cavity resonance sound absorption material and particle filling sound absorption material.
3. The underwater acoustic composite material has high pressure resistance, the highest compressive failure strength can reach 40MPa, the depth of the serviceable environment is 0-4000 m, and the water absorption rate in 168 hours in the working environment is lower than 1%.
4. The density of the underwater acoustic composite material is low and the range is 0.3-0.9g/cm 3, and the underwater acoustic composite material can be regulated and controlled by a light pressure-resistant composite foam matrix and a rubber-based structural member.
Drawings
FIG. 1 is a schematic diagram of the structure of a premix compound and a rubber-based structure of example 1;
FIG. 2 is a schematic view of a syntactic foam substrate with a cell structure of example 2;
FIG. 3 is a schematic view of a seal plate of example 1 or example 2;
fig. 4 is a schematic view of the sound absorbing composite material after sealing of example 1 or example 2.
Detailed Description
The technical scheme of the invention will be further described in detail below with reference to specific embodiments. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.
Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods.
Example 1
An underwater sound absorption composite material and a preparation method thereof are provided:
1. Preparation of premix of composite foam matrix: firstly, 100 parts by mass of epoxy resin (E44), 10 parts by mass of curing agent (polyether amine D230), 32 parts by mass of hollow glass beads (TIPC-H20, density of 0.20g/cm 3) and 2 parts by mass of carbon fiber are uniformly mixed to prepare a premix.
2. Preparing a rubber-based structural member: 100 parts by mass of butyl rubber (Yanshan petrochemical 1751) was plasticated on an internal mixer to obtain a rubber compound, and 25 parts by mass of hollow glass beads TIPC-H38 (density: 0.38g/cm 3) were added to the internal mixer, and the internal mixer was internally mixed for 10 minutes at 120 ℃. Mixing the banburying materials on a double-roller open mill, adding the weighed vulcanizing agent and the accelerator, pouring the mixture into a cavity mold after mixing uniformly, vulcanizing under 15MPa, vulcanizing at 145 ℃ for 5-10min, and demolding to obtain the rubber-based component with the cavity, wherein the perforation rate is 40%.
3. Compounding premix and rubber-based structural member: and (3) adhering and fixing the rubber-based structural member in a detachable assembled metal mold through an adhesive, pouring the premix in the step (1) into the mold, wherein the cavity is not filled with the premix, the height of the premix poured into the mold is related to the size of the rubber structural member, the molding height of the premix poured into the mold is higher than the size of the rubber structural member, the height difference is not lower than 2mm, and curing is carried out. And demolding, removing the metal mold, and distributing the rubber-based structural components in the composite foam matrix in an array structure, as shown in fig. 1.
4. And (3) sealing: and (3) pouring and curing the premix in the step (1) to prepare the sealing plate, wherein the thickness of the sealing plate is 2-15mm (shown in figure 3). And (3) bonding the sealing plate with the bottom of the composite member obtained in the step (3) by using an adhesive, so that the rubber structural member is not exposed to the outside, and obtaining the underwater sound absorption composite material, as shown in fig. 4.
The density of the underwater sound absorption composite material is 0.51g/cm 3, the average sound absorption coefficient is 0.71 (200 Hz-30kHz,6MPa water pressure, water sound), the water pressure resistance is 6 MPa@1680 h, and the water absorption is 0.15%.
Example 2
Unlike example 1, the premix was prepared by uniformly mixing 100 parts by mass of epoxy resin (E44), 10 parts by mass of curing agent (polyetheramine D230), 46 parts by mass of hollow glass beads (TIPC-H25, density 0.25g/cm 3) and 2 parts by mass of carbon fiber; the volume ratio (i.e., the perforation rate) of the cavity to the rubber-based component was 45%.
The density of the underwater sound absorption composite material obtained in the embodiment is 0.55g/cm 3, the average sound absorption coefficient is 0.74 (200 Hz-30kHz,6MPa water pressure and water sound), the water pressure resistance is 10MPa@168h, and the water absorption is 0.11%.
Example 3
Unlike example 1, the premix was prepared by uniformly mixing 100 parts by mass of epoxy resin (E44), 10 parts by mass of curing agent (polyetheramine D230), 46 parts by mass of hollow glass beads (TIPC-H30, density 0.30g/cm 3) and 1 part by mass of carbon fiber; the volume ratio (i.e., the penetration rate) of the cavity to the rubber-based component was 35%.
The density of the underwater sound absorption composite material obtained in the embodiment is 0.63g/cm 3, the average sound absorption coefficient is 0.72 (200 Hz-30kHz,6MPa water pressure and water sound), the water pressure resistance performance is 15MPa@168h, and the water absorption rate is 0.08%.
Example 4
Unlike example 1, the premix was prepared by uniformly mixing 100 parts by mass of epoxy resin (E44), 10 parts by mass of curing agent (polyetheramine D230), 46 parts by mass of hollow glass beads (TIPC-H38, density 0.38g/cm 3) and 1 part by mass of carbon fiber; the volume ratio (i.e., the perforation rate) of the cavity to the rubber-based component was 65%.
The density of the underwater sound absorption composite material obtained in the embodiment is 0.72g/cm 3, the average sound absorption coefficient is 0.83 (200 Hz-30kHz,6MPa water pressure and water sound), the water pressure resistance is 20MPa@1680 h, and the water absorption is 0.14%.
Example 5
Unlike example 1, the premix was prepared by uniformly mixing 100 parts by mass of epoxy resin (E44), 10 parts by mass of curing agent (polyetheramine D230), 46 parts by mass of hollow glass beads (TIPC-H46, density 0.46g/cm 3) and 2 parts by mass of carbon fiber; the volume ratio (i.e., the perforation rate) of the cavity to the rubber-based component was 50%.
The density of the underwater sound absorption composite material obtained in the embodiment is 0.80g/cm 3, the average sound absorption coefficient is 0.76 (200 Hz-30kHz,6MPa water pressure and water sound), the water pressure resistance performance is 30MPa@168h, and the water absorption rate is 0.18%.
Example 6
Unlike example 1, the premix was prepared by uniformly mixing 100 parts by mass of epoxy resin (E44), 10 parts by mass of curing agent (polyetheramine D230) and 46 parts by mass of hollow glass beads (TIPC-H50, density 0.50g/cm 3); the volume ratio (i.e., the perforation rate) of the cavity to the rubber-based component was 50%.
The density of the underwater sound absorption composite material obtained in the embodiment is 0.80g/cm 3, the average sound absorption coefficient is 0.76 (200 Hz-30kHz,6MPa water pressure and water sound), the water pressure resistance is 40MPa@168h, and the water absorption is 0.12%.
Example 7
An underwater sound absorption composite material and a preparation method thereof are provided:
Step 1, uniformly mixing 100 parts by mass of epoxy resin (E44), 1 part by mass of carbon fiber and 40 parts by mass of hollow microsphere glass beads (TIPC-H25, 0.25g/cm 3) to prepare a low-density pressure-resistant foam material, and processing the low-density pressure-resistant foam material into a composite foam matrix with a hole array structure shown in figure 2 according to design requirements. And simultaneously, a sealing plate with the thickness of 2-15mm is processed by using a low-density pressure-resistant foam material, as shown in figure 3.
Step 2, preparing a rubber-based structural member: 100 parts by mass of butyl rubber were plasticated on an internal mixer to obtain a plasticated rubber, and then 25 parts by mass of hollow glass beads (TIPC-H38, density 0.38g/cm 3) were added to the internal mixer, followed by banburying for 10 minutes at 120 ℃. Mixing the banburying materials on a double-roller open mill, adding the weighed vulcanizing agent and the accelerator, pouring the mixture into a cavity mold after mixing uniformly, vulcanizing under 15MPa, vulcanizing at 145 ℃ for 5-10min, and demolding to obtain the rubber-based structural member with the cavity, wherein the perforation rate is 40%.
And 3, filling the rubber-based structural member into the prefabricated hole structure in the step 1 by adopting an adhesive, and fixing, wherein the height of the rubber-based structural member is at least 2mm lower than that of the hole.
And 4, bonding the sealing plate in the step 1 on the exposed rubber-based structural member in the step 3, and sealing to obtain the underwater sound absorption composite material, as shown in fig. 4.
The underwater sound absorbing composite material obtained in this example had substantially the same properties as those of examples 1 to 6.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sound absorbing composite material, characterized in that the sound absorbing composite material comprises a composite foam matrix and a rubber-based structural member; wherein,
The preparation raw materials of the composite foam matrix comprise: hollow microspheres and resin-based materials;
the preparation raw materials of the rubber-based structural member comprise: rubber-based materials and fillers.
2. The sound absorbing composite according to claim 1, wherein said rubber-based structural members are distributed, preferably in an array, in said syntactic foam matrix.
Preferably, the rubber-based structure has a cavity. Preferably, the shape of the cavity is cylindrical, spherical, conical or square. Preferably, the volume ratio of the cavity to the rubber-based structure is 10-80%.
Preferably, the rubber-based structural members are distributed, preferably in an array, in the syntactic foam matrix, and the cavities are not filled by the syntactic foam matrix.
3. The sound absorbing composite of claim 1 or 2, wherein the density of the syntactic foam matrix is from 0.25 to 0.8g/cm 3;
And/or the isostatic fracture strength of the composite foam matrix is 1-190 MPa.
Preferably, the resin in the resin-based material is selected from one or more of epoxy resins, phenolic resins, polyurethane resins and unsaturated resins.
Preferably, the resin-based material is prepared from a resin and optionally an auxiliary agent.
Preferably, the preparation raw material of the composite foam matrix further comprises fibers.
Preferably, the hollow microspheres are selected from one or more of hollow glass microspheres, hollow polymer microspheres, hollow ceramic microspheres and hollow carbon microspheres.
Preferably, the preparation raw materials of the composite foam matrix comprise the following components in parts by mass: 100 parts by mass of a resin-based material, 10-90 parts by mass of hollow microspheres and 0-4 parts by mass of fibers.
4. A sound absorbing composite according to any one of claims 1 to 3, wherein the rubber in the rubber-based material is selected from the group consisting of rubber having a high loss of sound waves, such as one or more of natural rubber, butadiene rubber, styrene-butadiene rubber, butyl rubber and nitrile rubber.
Preferably, the filler is used to enhance the sound absorption properties of the sound absorbing composite, for example one or more selected from the group consisting of vermiculite powder, hollow glass microbeads, carbon fibers, and the like.
Preferably, the hollow microspheres and the filler are hollow glass microspheres. It is also preferred that the hollow glass microspheres do not exceed 0.80g/cm 3.
Preferably, the rubber-based structural member is prepared from the following raw materials in parts by mass: 100 parts by mass of rubber and 5-60 parts by mass of filler.
5. The sound absorbing composite according to any one of claims 1-4, wherein the height of the rubber-based structure does not exceed the height of the syntactic foam matrix, preferably is less than the height of the syntactic foam matrix, e.g. the difference in height between the two is not less than 2mm.
6. The sound absorbing composite of any one of claims 1-5, further comprising a sealing plate for sealing the rubber-based structure. Preferably, the sealing plate is made of the same material as the composite foam substrate.
7. The sound absorbing composite of any one of claims 1-6, wherein the sound absorbing composite has a density of 0.3 to 0.9g/cm 3;
And/or the compressive strength of the sound absorption composite material is 3-40 MPa;
and/or the underwater average sound absorption coefficient of the sound absorption composite material is 0.6-0.8 (6 MPa water pressure, 200Hz-30 kHz).
8. A method of producing a sound absorbing composite material according to any one of claims 1 to 7, characterized in that the method of producing comprises the steps of: fixing a rubber-based structural member at the bottom of a mold, pouring a premix of a composite foam matrix into the mold, curing, and demolding to obtain the sound absorption composite material;
The premix of the composite foam matrix is obtained by mixing preparation raw materials of the composite foam matrix.
Preferably, the rubber-based structure is a rubber structure having a cavity.
Preferably, the rubber-based structure is fixed to the bottom of the mold in an array.
Preferably, the preparation method further comprises the following steps: and sealing the rubber-based structural part in the demolded material by using a sealing plate.
9. A method of producing a sound absorbing composite material according to any one of claims 1 to 7, characterized in that the method of producing comprises the steps of: preparing or preparing a composite foam matrix with a pore structure, and fixing a rubber-based structural member in the pore structure to obtain the sound absorption composite material.
Preferably, the pore structure is an array pore structure.
Preferably, the holes in the hole structure are through holes or non-through holes, preferably non-through holes.
Preferably, the preparation method further comprises the following steps: the rubber-based structural member fixed in the hole structure is closed with a sealing plate.
10. Use of the sound absorbing composite material of any one of claims 1-7 in an underwater device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211736265.9A CN118271796A (en) | 2022-12-30 | 2022-12-30 | Sound absorption composite material and preparation method and application thereof |
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| CN202211736265.9A CN118271796A (en) | 2022-12-30 | 2022-12-30 | Sound absorption composite material and preparation method and application thereof |
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