Soundproofing device, method for its production and use

Abstract

The present application relates to a sound insulation device and a preparation method and application thereof, the sound insulation device comprises a sandwich material and a foamed layer, a closed-cell foam metal layer, a metal plate substrate and a surface material arranged on both sides of the sandwich material from inside to outside. The sound insulation device has excellent sound insulation performance for low-frequency sound waves and medium-high frequency sound waves, and has the characteristics of lightweight.

Description

[0001] This application is a divisional application of patent application number 202211698486.1, the original application being filed on December 28, 2022, and the invention being entitled "A Sound Insulation Device and Its Preparation Method and Application - Applied to the Divisional Application". Technical Field

[0002] This invention relates to the field of sound insulation device technology, and in particular to a sound insulation device, its preparation method and application. Background Technology

[0003] In traditional air noise control, single-layer homogeneous panels are often used. They are the simplest sound insulation structure. By processing them into metal microporous panels, environmental noise reduction has been widely applied in production workshops, construction sites, and ventilation systems.

[0004] In the treatment of local airborne noise, one approach is to use traditional sound-absorbing materials that work according to the law of mass, such as brick walls, concrete, pearl cotton, and metal sheets. These materials have high surface density and rigidity, and by increasing the surface density of the components, the sound insulation will also increase accordingly.

[0005] CN212200840U discloses a sound insulation device for building engineering, including a sound insulation device body. A left side plate is provided on one outer surface of the sound insulation device body, and a right side plate is provided on the other outer surface of the sound insulation device body. A protective mechanism and a sound-absorbing hole are provided on the front outer surface of the sound insulation device body. The sound-absorbing hole is located at the lower end of the protective mechanism. An installation mechanism is provided on one outer surface of the left side plate.

[0006] Another approach is to use polymer materials with artificially designed structures, such as polyethylene materials and film materials. This approach is often used to achieve sound absorption and reduce system damping by combining different materials with rubber or polyethylene film. Common composite materials are PVC, polyethylene (PE) and rubber.

[0007] CN102733953A discloses a sound insulation device for an engine test bench in the field of engine test bench technology. The sound insulation device for the engine test bench is configured as a plate structure. The sound insulation device includes a steel plate layer (1) and a butyl damping rubber layer (2). The steel plate layer (1) and the butyl damping rubber layer (2) of the sound insulation device are connected together by adhesive. The exhaust pipe (10) of the engine installed on the engine test bench is configured to pass through the sound insulation device.

[0008] Most existing sound insulation devices use a "labyrinth structure" or cavity to achieve self-cancellation of sound waves within the structure; they cannot simultaneously possess excellent sound insulation performance for both low-frequency and mid-to-high-frequency sound waves, and are lightweight.

[0009] In conclusion, it is crucial to develop a sound insulation device that can overcome the aforementioned shortcomings. Summary of the Invention

[0010] In view of the shortcomings of the prior art, the purpose of this invention is to provide a sound insulation device, its preparation method and application. The sound insulation device not only has excellent sound insulation performance for low-frequency sound waves and mid-to-high-frequency sound waves, but also has the characteristics of being lightweight.

[0011] To achieve this objective, the present invention adopts the following technical solution:

[0012] In a first aspect, the present invention provides a sound insulation device, the sound insulation device comprising a sandwich material and a foam layer, a closed-cell foam metal layer, a metal plate substrate and a surface material disposed on both sides of the sandwich material from the inside to the outside.

[0013] In this invention, the sound insulation device causes sound waves to be reflected, refracted, and absorbed within the micropores and channels of the board. When sound waves propagate on the elastic matrix surface of the foamed layer and closed-cell foam metal layer, they encounter obstacles, altering the propagation path and prolonging the propagation time within the material, thus increasing sound energy dissipation. The sound insulation device not only possesses excellent sound insulation performance for both low-frequency and mid-to-high-frequency sound waves but also features lightweight design.

[0014] Preferably, the thickness of the interlayer material is 0.5-1.5 mm, such as 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, etc.

[0015] Preferably, the thickness of each foam layer is independently ≥15mm, such as 16mm, 18mm, 20mm, 22mm, etc.

[0016] Preferably, the thickness of each closed-cell foam metal layer is independently 0.5mm-3mm, such as 1mm, 1.5mm, 2mm, 2.5mm, etc.

[0017] Preferably, the thickness of each of the metal plate substrates is 1-2 mm, for example, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, etc.

[0018] Preferably, the thickness of each of the face materials is independently 0.5-10mm, such as 1mm, 2mm, 4mm, 6mm, 8mm, etc.

[0019] Preferably, the interlayer material includes any one or a combination of at least two of open-cell foamed copper, closed-cell foamed copper, closed-cell foamed aluminum, other closed-cell foamed metals or closed-cell non-metallic materials. Typical but non-limiting combinations include: a combination of open-cell foamed copper and closed-cell foamed copper, a combination of closed-cell foamed aluminum and other closed-cell foamed metals, a combination of open-cell foamed copper, closed-cell foamed copper, closed-cell foamed aluminum, other closed-cell foamed metals and closed-cell non-metallic materials, etc.

[0020] Preferably, the number of pores in the open-cell copper foam is 5-50 PPI, such as 10 PPI, 15 PPI, 20 PPI, 25 PPI, 30 PPI, 35 PPI, 40 PPI, 45 PPI, etc.

[0021] In this invention, the number of pores in the open-cell foam copper is preferably 5-50 PPI. The reason is that a specific number of pores will cause the sound waves to undergo repeated refraction, reflection, and diffraction in the pores. The occurrence of the above processes can effectively reduce or self-reduce the sound wave energy after passing through the pores. If the number of pores is too high, the micropores will not be able to diffract effectively, reducing the sound wave attenuation ability. If the number of pores is too low, the refraction and reflection will occur on the outside of the material, which is not conducive to the attenuation of sound waves.

[0022] Preferably, each of the foam layers independently comprises a polyurethane foam layer.

[0023] Preferably, the materials of the polyurethane foam layers each independently include pressure-foamed polyurethane and / or closed-cell foamed polyurethane.

[0024] Preferably, the foaming pressure of the pressure-blown polyurethane is ≥0.1MPa, such as 0.2MPa, 0.4MPa, 0.5MPa, etc., and more preferably 0.1-0.5MPa.

[0025] In this invention, the foaming pressure of the pressure-blown polyurethane is ≥0.1MPa. The reason is that: a lower foaming pressure will cause the density and strength of the material to fail to meet the requirements for use; a lower foaming pressure will cause the size of the polyurethane pores after foaming to be larger, reducing its ability to reduce sound energy.

[0026] Preferably, the foaming density of the closed-cell polyurethane foam is ≥35 kg / m³. 3 For example, 36kg / m 3 38kg / m 3 40kg / m 3 42kg / m 3 44kg / m 3 wait.

[0027] In this invention, the foaming density of the closed-cell polyurethane foam is ≥35kg / m³. 3The reason is that it is necessary to ensure the strength and pore size after foaming; if the foaming density is too low, the pore size of the material will be too large, resulting in insufficient sound absorption capacity.

[0028] Preferably, the material of the closed-cell foam metal layer includes closed-cell foam copper and / or closed-cell foam aluminum.

[0029] Preferably, each of the metal plate substrates independently comprises galvanized steel plate and / or aluminum plate.

[0030] Preferably, the metal plate substrate has micropores.

[0031] In this invention, by combining materials with different porosities, noise levels can be reduced to an acceptable level. The application of closed-cell materials lengthens the sound wave propagation path, dissipating energy and achieving noise reduction. Specifically, multiple layers of materials with different porosities are arranged along the sound wave propagation direction. The reflection and refraction of sound waves within different pore sizes increase the propagation distance, thereby reducing sound energy and achieving noise reduction. Specifically, when sound waves propagate within a porous metal medium, the high surface density of the metal substrate not only creates a sound insulation effect but also causes air vibration within the pores. This vibration, combined with friction between the closed-cell composite material and the closed-cell microporous metal material, is dissipated as heat energy, ultimately reducing the sound energy penetrating the multilayer material and thus lowering environmental noise levels to a certain extent.

[0032] Preferably, the thickness of the micropores is the same as the thickness of the metal plate substrate.

[0033] Preferably, the area ratio of the micropores is 2%-3% based on the area of ​​the metal plate substrate as 100%, such as 2.2%, 2.4%, 2.6%, 2.8%, etc.

[0034] Preferably, each of the surface materials independently comprises a foamed silicone rubber sheet and / or a foamed polyethylene sheet.

[0035] Preferably, the hardness of the foamed silicone rubber sheet is ≥30A, such as 32A, 34A, 36A, 38A, etc.

[0036] In this invention, the hardness of the foamed silicone rubber sheet is ≥30A because: the foamed silicone sheet is a closed-cell foamed material, and a hardness of 30A or higher can effectively ensure its porosity, and the foaming process is simple and easy to obtain; if its hardness is too low, the material porosity will be too high, which is not conducive to sound absorption.

[0037] Preferably, the porosity of the foamed silicone rubber sheet is ≤1%, for example, 0.8%, 0.6%, 0.4%, etc.

[0038] Preferably, the foamed polyethylene board has a foaming density ≥160 kg / m³.3 For example, 165kg / m 3 170kg / m 3 175kg / m 3 180kg / m 3 wait.

[0039] Preferably, the thickness of the foamed polyethylene board is ≥2mm, such as 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc.

[0040] Preferably, the porosity of the foamed polyethylene board is 0.3% or ≥0.5%, such as 0.6%, 0.8%, 1%, 1.2%, etc. More preferably, the porosity of the foamed polyethylene board is ≥0.5%, and even more preferably 0.5%-1.5%.

[0041] In this invention, the porosity of the foamed polyethylene board is ≥0.5% because the foaming process is simple and easy to obtain; a low porosity would lead to a complex manufacturing process and higher costs.

[0042] In this invention, a sound insulation device is installed on the noise-generating side. This device consists of a foamed layer, a closed-cell foamed metal layer, a metal plate substrate, and a surface material on both sides of the sandwich material. By utilizing the different porosities of different foamed composite materials, sound waves of different wavelengths are refracted and reflected in the gaps, increasing the propagation path of the sound waves and thus achieving a noise reduction effect. The advantage of this method is that by utilizing the sound insulation performance of the stiffness and surface density of the foamed metal microporous material and the closed-cell structure of the multilayer foamed polyurethane composite material, the sound energy of the sound waves is consumed. Accordingly, the material effectively blocks sound waves in the conventional frequency range, thereby achieving a noise reduction effect.

[0043] Secondly, the present invention provides a method for preparing the sound insulation device described in the first aspect, the method comprising the following steps:

[0044] The sound insulation device is obtained by setting a foam layer, a closed-cell foam metal layer, a metal plate substrate and a surface material on both sides of the sandwich material.

[0045] Preferably, the face material is pre-formed onto the surface of the metal plate substrate by heat coating.

[0046] Preferably, the metal plate substrate is bonded to both sides of the sandwich material through a foaming layer.

[0047] As a preferred technical solution, the preparation method includes the following steps:

[0048] (1) The face material is pre-fabricated on the surface of the metal plate substrate by heat coating;

[0049] (2) A closed-cell foam metal layer is provided between the metal plate substrate and the foam layer, and the foam layer is attached to both sides of the interlayer material to obtain the sound insulation device.

[0050] In this invention, the entire sound insulation device can be manufactured using the commonly used foaming process of double-sided color steel polyurethane insulation board, which is simple to produce and low in cost.

[0051] Thirdly, the present invention provides an application of the sound insulation device described in the first aspect in mechanical equipment, anechoic chambers, subway stations, or high-speed train carriages.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) The sound insulation device described in this invention not only has excellent sound insulation performance for low-frequency sound waves and mid-to-high-frequency sound waves, but also has the characteristics of being lightweight.

[0054] (2) The sound insulation device of the present invention has a sound insulation performance for low-frequency sound waves (frequency range of 50-200Hz), with a noise assessment value of less than 72.98dB(A) in the low-frequency range, which can reduce noise by about 1.9-5.66dB(A) compared to a sound insulation device without interlayer material; the sound insulation device of the present invention has a sound insulation performance for mid-to-high frequency sound waves (frequency range of 200-2000Hz, but not equal to 200Hz), with a noise assessment value of less than 77.68dB(A), which can reduce noise by about 4.84-10.3dB(A). Detailed Implementation

[0055] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0056] Example 1

[0057] This embodiment provides a sound insulation device, which includes a sandwich material and a foam layer, a metal plate substrate, and a face material disposed on both sides of the sandwich material from the inside to the outside. Specifically, the first face material, the first metal plate substrate, the first closed-cell foam metal layer, the first foam layer, the sandwich material, the second foam layer, the second closed-cell foam metal layer, the second metal plate substrate, and the second face material are stacked in sequence.

[0058] The specific settings for each layer are as follows:

[0059] Interlayer material: 1mm thick, made of open-cell foamed copper with a pore size of 30PPI.

[0060] First and second foam layers: polyurethane foam layers, both 15mm thick, made of pressure-blown polyurethane with a foaming pressure of 0.2MPa, purchased from Jiangsu Jingxue Energy Saving Technology Co., Ltd.

[0061] The first closed-cell foam metal layer and the second closed-cell foam metal layer are both 1.5mm thick and made of closed-cell foam metal copper.

[0062] The first and second metal substrates are both 1.5 mm thick and made of galvanized steel. They are provided with uniformly distributed micropores, and the area of ​​the micropores accounts for 2.5% of the area of ​​the metal substrate.

[0063] First and second face materials: both are 1.5mm thick, made of foamed silicone rubber sheet, with a hardness of 32A and a porosity of 0.8%.

[0064] The sound insulation device is obtained by the following preparation method, which includes the following steps:

[0065] (1) The face material is pre-fabricated on the surface of the metal plate substrate by heat coating;

[0066] (2) A closed-cell foam metal layer is provided between the metal plate substrate and the foam layer, and the foam layer is attached to both sides of the interlayer material to obtain the sound insulation device.

[0067] Example 2

[0068] This embodiment provides a sound insulation device, which includes a sandwich material and a foam layer, a metal plate substrate, and a face material disposed on both sides of the sandwich material from the inside to the outside. Specifically, the first face material, the first metal plate substrate, the first closed-cell foam metal layer, the first foam layer, the sandwich material, the second foam layer, the second closed-cell foam metal layer, the second metal plate substrate, and the second face material are stacked in sequence.

[0069] The specific settings for each layer are as follows:

[0070] Interlayer material: 1mm thick, made of closed-cell foam copper.

[0071] First and second foam layers: Polyurethane foam layers, 15mm thick, both made of closed-cell polyurethane foam with a foaming density of 38kg / m³. 3 .

[0072] The first closed-cell foam metal layer and the second closed-cell foam metal layer are both 3mm thick and are made of closed-cell foam copper and closed-cell foam aluminum in a 1:1 mass ratio.

[0073] The first and second metal substrates are both 1mm thick and made of aluminum.

[0074] Both the first and second facing materials are 2mm thick and made of foamed polyethylene board with a foaming density of 180kg / m³. 3 The porosity is 0.6%.

[0075] The method for preparing the sound insulation device is the same as in Example 1.

[0076] Example 3

[0077] This embodiment provides a sound insulation device, which includes a sandwich material and a foam layer, a metal plate substrate, and a face material disposed on both sides of the sandwich material from the inside to the outside. Specifically, the first face material, the first metal plate substrate, the first closed-cell foam metal layer, the first foam layer, the sandwich material, the second foam layer, the second closed-cell foam metal layer, the second metal plate substrate, and the second face material are stacked in sequence.

[0078] The specific settings for each layer are as follows:

[0079] Sandwich material: 1.5mm thick, made of closed-cell polyurethane.

[0080] First and second foam layers: Polyurethane foam layers, 15mm thick, both made of closed-cell polyurethane foam with a foaming density of 38kg / m³. 3 .

[0081] The first closed-cell foam metal layer and the second closed-cell foam metal layer are both 1.5mm thick and made of closed-cell foam copper.

[0082] The first and second metal substrates are both 2mm thick and made of aluminum.

[0083] Both the first and second facing materials are 2.5mm thick and made of foamed polyethylene board with a foaming density of 160kg / m³. 3 The porosity is 0.6%.

[0084] The method for preparing the sound insulation device is the same as in Example 1.

[0085] Example 4

[0086] This embodiment provides a sound insulation device, which includes a sandwich material and a foam layer, a metal plate substrate, and a face material disposed on both sides of the sandwich material from the inside to the outside. Specifically, the first face material, the first metal plate substrate, the first closed-cell foam metal layer, the first foam layer, the sandwich material, the second foam layer, the second closed-cell foam metal layer, the second metal plate substrate, and the second face material are stacked in sequence.

[0087] The specific settings for each layer are as follows:

[0088] Interlayer material: 0.5mm thick, made of open-cell foamed copper with a pore size of 50PPI.

[0089] First foam layer: 15mm thick, made of pressure-blown polyurethane foam, with a foaming pressure of 0.2MPa.

[0090] The second foaming layer is 15mm thick and made of closed-cell polyurethane foam with a foaming density of 38kg / m³. 3 .

[0091] The first closed-cell foam metal layer has a thickness of 3mm and is made of closed-cell foam metal copper.

[0092] The second closed-cell foam metal layer has a thickness of 0.5 mm and is made of closed-cell foam metal copper.

[0093] The first metal plate substrate has a thickness of 2mm and is made of galvanized steel plate. It has uniformly distributed micropores, and the area of ​​the micropores accounts for 2% of the area of ​​the metal plate substrate.

[0094] The second metal substrate is 1mm thick and made of aluminum. It has uniformly distributed micropores, and the area of ​​the micropores accounts for 3% of the area of ​​the metal substrate.

[0095] First surface material: 8mm thick, made of foamed silicone rubber board, hardness 30A, porosity 0.8%.

[0096] The second cladding material is 2.5mm thick and made of foamed polyethylene board with a foaming density of 180kg / m³. 3 The porosity is 0.6%.

[0097] Example 5

[0098] The difference between this embodiment and Embodiment 1 is that the pore size of the open-cell copper foam in the interlayer material is 55 PPI, while the rest are the same as in Embodiment 1.

[0099] Example 6

[0100] The difference between this embodiment and Embodiment 1 is that the pressure-blown polyurethane in the first and second foaming layers has a foaming pressure of 0.05 MPa, while the rest is the same as in Embodiment 1.

[0101] Example 7

[0102] The difference between this embodiment and Embodiment 2 lies in the closed-cell polyurethane foam in the first and second foaming layers, with a foaming density of 33 kg / m³. 3 Everything else is the same as in Example 1.

[0103] Example 8

[0104] The difference between this embodiment and Embodiment 1 is that the hardness of the foamed silicone rubber sheet in the first and second face materials is 28A, while the rest are the same as in Embodiment 1.

[0105] Example 9

[0106] The difference between this embodiment and Embodiment 2 is that the porosity of the foamed polyethylene board in the first and second face materials is 0.3%, while the rest are the same as in Embodiment 2.

[0107] Comparative Example 1

[0108] This comparative example provides a sound insulation device, which is a single-layer homogeneous plate with micropores, 4mm thick, and made of galvanized sheet.

[0109] Comparative Example 2

[0110] The difference between this comparative example and Example 1 is that it does not include the interlayer material; otherwise, it is the same as Example 1.

[0111] Performance testing

[0112] The sound insulation devices described in Examples 1-9 and Comparative Examples 1-2 were tested as follows:

[0113] (1) Sound insulation performance:

[0114] 1) Use a noise meter to record the background noise at the A-weighted sound pressure level; (the difference between the test value and the background noise should be at least 3dB, and if it is less than 10dB, it needs to be corrected);

[0115] 2) On the center line of the front of the device being tested, 1 meter away, at the height of the middle position of the device (approximately half the height of the device, not less than 1m, not more than 1.5m, generally between 1.25m and 1.3m);

[0116] 3) Test the center point of the four sides (front, back, left, and right), with at least 5 sets of data for each direction, and the time interval between the data tests for each direction is not less than 30 seconds;

[0117] 4) The distance between the person and the noise meter should be at least 0.5 meters. The noise meter should be set to A-weighted sound pressure level and measured using the slow setting.

[0118] 5) The standard measurement method is as follows: the equipment is enclosed and measured using the aforementioned sound insulation materials;

[0119] 6) Comparative tests were conducted using traditional sound insulation panels and sound insulation devices prepared in the above manner;

[0120] 7) The average of the 5 sets of data recorded within 30 seconds is used as the noise assessment value of the current device.

[0121] (2) Low-frequency quality or mid-to-high-frequency quality: Calculate the difference between the sound insulation performance of each embodiment and Comparative Example 1 and Comparative Example 2 as the basis for quality judgment.

[0122] The test results are summarized in Table 1.

[0123] Table 1

[0124]

[0125]

[0126] Analysis of the data in Table 1 shows that the sound insulation device of the present invention has a sound insulation performance for low-frequency sound waves (frequency range of 50-200Hz), with a noise assessment value below 72.98dB(A), which can reduce noise by about 1.9-5.66dB(A) compared to Comparative Example 2. For mid-to-high frequency sound waves (frequency range of 200-2000Hz, but not equal to 200Hz), the sound insulation device has a noise assessment value below 77.68dB(A), which can reduce noise by about 4.84-10.3dB(A). The reason for the significant sound insulation effect for mid-to-high frequencies is that the wavelengths of mid-to-high frequency sound waves are closer in size to the characteristic dimensions of the aforementioned microporous or closed-cell foam materials or metal foam materials; this allows sound energy to oscillate, reflect, refract, and be attenuated more effectively within the gaps. The sound insulation device described in this invention not only has excellent sound insulation performance for both low-frequency and mid-to-high-frequency sound waves, but also features lightweight design.

[0127] Analysis of Comparative Examples 1-2 and Example 1 shows that the performance of Comparative Examples 1-2 is not as good as that of Example 1, proving that the sound insulation device described in this invention has better performance.

[0128] Analysis of Example 5 and Example 1 shows that the performance of Example 5 is not as good as that of Example 1, proving that when the interlayer material is open-cell foamed copper, the sound insulation device formed with the number of pores in the range of 5-50 PPI has better performance.

[0129] Analysis of Example 6 and Example 1 shows that the performance of Example 6 is not as good as that of Example 1, which proves that when pressure-blown polyurethane is used as the foaming layer material, the sound insulation device formed by foaming pressure ≥0.1MPa has better performance.

[0130] Analysis of Examples 7 and 2 shows that the performance of Example 7 is inferior to that of Example 2, proving that when closed-cell polyurethane foam is used as the foaming layer material, the foaming density must be ≥35kg / m³. 3 The resulting sound insulation device has better performance.

[0131] Analysis of Example 8 and Example 1 shows that the performance of Example 8 is not as good as that of Example 1, proving that when foamed silicone rubber board material is selected as the surface material, the sound insulation device formed with a hardness ≥30A has better performance.

[0132] Analysis of Example 9 and Example 2 shows that the performance of Example 9 is not as good as that of Example 2, which proves that when foamed polyethylene board is selected as the surface material, the sound insulation device formed by a porosity ≥0.5% has better performance.

[0133] The present invention has been illustrated with the above embodiments to explain the detailed method of the present invention. However, the present invention is not limited to the detailed method described above, that is, it does not mean that the present invention must rely on the detailed method described above to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A sound insulating device, characterized in that The sound insulation device includes a sandwich material and a foam layer, a closed-cell foam metal layer, a metal plate substrate, and a surface material disposed on both sides of the sandwich material from the inside out. The interlayer material includes any one or a combination of at least two of the following: open-cell copper foam, closed-cell copper foam, closed-cell aluminum foam, other closed-cell metal foams, or closed-cell non-metallic materials. The number of pores in the perforated copper foam is 5-50 or 55 PPI; Each of the foamed layers independently comprises a polyurethane foam layer; The materials of the polyurethane foam layers each independently include pressure-foamed polyurethane and / or closed-cell foamed polyurethane. The foaming pressure of the pressure-blown polyurethane is ≥0.1MPa; The closed cell foamed polyurethane has a foaming density ≥ 35 kg / m 3 ; Each of the surface materials independently comprises a foamed silicone rubber sheet and / or a foamed polyethylene sheet; The porosity of the foamed silicone rubber sheet is ≤1%. The foamed polyethylene board has a porosity of 0.3% or a porosity ≥ 0.5%; The thickness of the interlayer material is 0.5-1.5 mm, and the thickness of each foam layer is ≥15 mm independently.

2. The sound insulating device of claim 1, wherein The thickness of each closed-cell foam metal layer is independently 0.5mm-3mm.

3. The sound isolating device of claim 1, wherein The thickness of each of the metal plate substrates is 1-2 mm.

4. The sound isolating device of claim 1, wherein The thickness of each of the face materials is independently 0.5-10 mm.

5. The sound isolating device of claim 1, wherein The number of pores in the perforated copper foam is 5-50 PPI.

6. The sound isolating device of claim 1, wherein The material of the closed-cell foam metal layer includes closed-cell foam copper and / or closed-cell foam aluminum.

7. The sound isolating device of claim 1, wherein The metal plate substrates each independently include galvanized steel plates and / or aluminum plates.

8. The sound insulation device according to claim 1, characterized in that, The metal plate substrate has micropores.

9. The sound insulation device according to claim 8, characterized in that, The thickness of the micropores is the same as the thickness of the metal plate substrate.

10. The sound insulation device according to claim 8, characterized in that, With the area of ​​the metal plate substrate as 100%, the area ratio of the micropores is 2%-3%.

11. The sound insulation device according to claim 1, characterized in that, The hardness of the foamed silicone rubber sheet is ≥30A.

12. The sound insulation device according to claim 1, characterized in that, The foamed polyethylene board has a foaming density ≥ 160 kg / m 3 .

13. The sound insulation device according to claim 1, characterized in that, The thickness of the foamed polyethylene board is ≥2mm.

14. A method for preparing a sound insulation device according to any one of claims 1-13, characterized in that, The preparation method includes the following steps: The sound insulation device is obtained by setting a foam layer, a closed-cell foam metal layer, a metal plate substrate and a surface material on both sides of the sandwich material.

15. The preparation method according to claim 14, characterized in that, The face material is pre-fabricated onto the surface of the metal plate substrate by heat coating.

16. The preparation method according to claim 14, characterized in that, The preparation method includes the following steps: (1) The face material is pre-fabricated on the surface of the metal plate substrate by heat coating; (2) A closed-cell foam metal layer is provided between the metal plate substrate and the foam layer, and the foam layer is attached to both sides of the interlayer material to obtain the sound insulation device.

17. The application of the sound insulation device according to any one of claims 1-13 in mechanical equipment, anechoic chambers, subway stations or high-speed train carriages.

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