Environment-friendly magnetic light-weight sound-absorbing and sound-insulating damping plate for automobile

Abstract

The utility model discloses an automobile environment-friendly magnetic light-weight sound-absorbing and sound-insulating damping plate which comprises a composite sound-absorbing and sound-insulating layer and a rubber soft magnetic layer. The cork and the rubber magnet are ingeniously combined, and low carbon emission and low pollution in the whole process from raw materials to production to use are achieved. Through the structural design and the processing technology, potential VOCs pollution is effectively avoided, and the environment-friendly sustainable characteristics of being renewable, recoverable, low in energy consumption, low in pollution emission, low in manufacturing cost and the like are achieved. Compared with the existing automobile damping rubber with a single sound insulation function on the market, the automobile damping rubber not only has a sound absorption function, but also has the advantages of being flexible to install and easy to transfer and clean. By means of the cork particle board layer and reduction or removal of butyl rubber and asphalt, the gram weight of the automobile damping rubber is reduced by 80%-90% compared with that of automobile damping rubber in the existing market, and the sound insulation performance is equivalent.

Description

Technical Field

[0001] The utility model relates to an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing plate for an automobile. Background Art

[0002] Existing car sound insulation panels are usually made of materials such as butyl rubber or asphalt. Its main structure is a 0.2 mm thick aluminum foil layer, and a 3 mm thick butyl rubber or asphalt adhesive is used to bond the aluminum film layer and the sound insulation together through adhesion. However, this sound insulation panel has the following disadvantages:

[0003] 1. Metals such as aluminum foil are usually not sound-absorbing materials, and they tend to reflect sound. Since the metal surface is smooth and hard, sound waves will reflect and echo on the metal surface. This means that aluminum foil metal will cause sound to travel farther in the space, increasing noise and echo problems. Therefore, aluminum foil is not suitable for setting as the first layer of the sound insulation board in the acoustic noise reduction design.

[0004] 2. Asphalt glue is harmful to the human body and is not environmentally friendly.

[0005] 3. The manufacturing process of existing butyl rubber and asphalt rubber sound insulation boards generates pollution, and they cannot be recycled after being discarded, causing pollution to the environment.

[0006] 4. The raw materials of traditional sound insulation material butyl rubber do not have viscosity. Therefore, during the production process, manufacturers need to add a large amount of adhesives. Some manufacturers introduce various volatile organic compounds (VOCs), such as aldehydes, benzenes, phenols and ethers, to adjust their viscosity and adhesion properties, which poses health and safety risks.

[0007] 5. Existing butyl rubber and asphalt rubber sound insulation boards have high density and heavy weight. The weight reaches 2 kg at the industry standard size (82 cm long, 46 cm wide, and 3 mm high). When the whole vehicle is installed with sound insulation boards of 30 specifications, the vehicle load increases by 60 kg, which will significantly affect the vehicle's power, energy consumption and handling performance.

[0008] 6. Existing butyl rubber and asphalt rubber sound insulation boards have high density and large mass, which can effectively prevent the conduction and penetration of sound to achieve sound insulation, but cannot effectively absorb sound. When the noise in the car and the sound waves emitted by the car audio need to be reflected more times in the compartment before attenuation, they cannot actively absorb the sound wave energy and reduce the reflection and propagation of the sound waves, which is prone to standing waves and resonance problems, and the listening quality of the car audio will also decline.

[0009] 7. The existing sound insulation board has a single function. When laid on the car floor sheet metal, it can only provide sound insulation but has no impact buffering effect.

[0010] 8. Existing sound insulation panels are difficult to remove once they are attached.

[0011] 9. Peeling off the existing sound insulation panels will destroy their structure and they cannot be reused. Summary of the invention

[0012] In view of the defects in the prior art, the utility model provides an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing plate for an automobile to improve the sound absorption, sound insulation and shock-absorbing effects and increase its versatility.

[0013] The utility model provides an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing plate for automobiles, comprising a two-layer composite structure, which comprises, from top to bottom or from outside to inside, a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2).

[0014] According to the environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles described in claim 1, it is characterized in that: the composite sound-absorbing and sound-insulating layer (1) can include a five-layer, four-layer, three-layer, two-layer, or one-layer structure. The present invention preferably uses the following "five-layer structure" as an example of the materials involved, and the uses of other layers will be summarized in the "Specific Implementation" section; the "five-layer structure" of the composite sound-absorbing and sound-insulating layer (1) described is specifically, the first layer: cork cloth layer (3), the second layer: polyester fiber cloth layer (4) or glass fiber cloth layer (5), the third layer: cork particle board layer (6), the fourth layer: polyester fiber cloth layer (4) or glass fiber cloth layer (5), and the fifth layer: cork cloth layer (3).

[0015] The thickness of the composite sound-absorbing and insulating layer (1) is 1-50 mm. In further detail, the thickness of the cork cloth layer (3) in the composite sound-absorbing and insulating layer (1) is 0.1-3 mm; the thickness of the polyester fiber cloth layer (4) and the glass fiber cloth layer (5) is 0.1-3 mm; the thickness of the cork particle board layer (6) is 1-50 mm; the thickness of the aluminum foil layer (7) is 0.1-3 mm; and the thickness of the butyl rubber layer (8) is 0.1-5 mm.

[0016] The rubber soft magnetic layer (2) has a thickness of 0.1-5 mm and can be arranged inside the cork particle board layer (6) in the composite sound absorbing and insulating layer (1) or on the lower surface of the composite sound absorbing and insulating layer (1).

[0017] The rubber soft magnetic layer (2) is an environmentally friendly material, because its main raw materials include natural rubber, old tire rubber powder, etc. Most of these raw materials come from renewable resources or are recycled, and have good environmental properties; in the process of manufacturing rubber magnets, clean processes such as hot pressing molding are adopted, which not only effectively avoids the use of a large number of chemical additives, but also can effectively control the emission of pollutants in the production process.

[0018] The main material of the cork particle board layer (6) is cork (or carbonized), and the auxiliary material is water-based polyurethane resin. Cork is a natural material extracted from the bark of cork oak trees, has excellent sound absorption and sound insulation effects, and has the physical properties of light weight, high elasticity, wear resistance, heat insulation, flame retardancy, and high friction damping. Its gram weight is only one tenth of that of butyl rubber and asphalt. In terms of environmental protection, the cork extraction process does not require the felling of trees and can continuously absorb CO2. It has environmentally friendly and sustainable characteristics such as renewable, recyclable, and low energy consumption in the production process.

[0019] The waterborne polyurethane resin is a type of environmentally friendly material with important application value, and it has the following characteristics: 1. Good environmental protection. The waterborne polyurethane resin is a water-based material that does not contain organic solvents, is odorless and formaldehyde-free, and does not release harmful volatile organic compounds (VOCs) during production and use. This makes it environmentally friendly. 2. Strong water resistance and weather resistance. This type of resin has excellent water resistance and weather resistance, can meet the requirements of outdoor use, and has a wide range of uses in the fields of wood, building materials, etc. 3. Excellent bonding performance. The waterborne polyurethane resin has excellent bonding performance and can firmly bond to a variety of substrates such as wood, metal, and plastic. It is widely used in various bonding adhesives. 4. Good flexibility. The molecular chain flexibility of the waterborne polyurethane resin gives it good flexibility similar to cork, so it is particularly suitable for the production of cork particle boards.

[0020] It is worth mentioning that carbonization of cork can greatly improve the weather resistance and corrosion resistance of wood. After carbonization, the lignin and wood fibers inside the cork will undergo chemical changes, thereby improving the durability of the wood. When used outdoors, carbonized wood can resist the damage of rain, sunlight and microorganisms, and is more durable than ordinary cork.

[0021] The beneficial effects of the utility model are reflected in that, compared with the single sound insulation function of the automobile damping glue on the existing market, the utility model has an additional sound absorption function; by using the softness, high friction damping and wear resistance of the cork in the composite sound absorption and insulation layer (1), combined with the rubber soft magnetic layer (2) attached to the body sheet metal, installation without double-sided tape and adhesive is achieved, and the utility model has the function of easy transfer and debugging; by adding a cork particle board layer (6), the use of butyl glue and asphalt is reduced or eliminated, so that the gram weight of the utility model is reduced by 80-90% compared with the automobile damping glue on the existing market.

[0022] The high environmental protection performance of the utility model is specifically manifested in that the materials of each layer are bonded together by environmentally friendly glue, and then the environmental protection performance of the overall material can be effectively maintained through the optimization of the structural design. Specifically, when the rubber soft magnetic layer (2) is arranged inside the cork particle board layer (6), the utility model can be attached to the automobile sheet metal through the magnetic force and the friction damping provided by the cork material. This design can effectively avoid the use of double-sided adhesive tape and its matching release paper, and can also greatly reduce the amount of environmentally friendly glue required. Through the optimization of material selection and structural design, the utility model has significantly improved environmental protection, resource utilization efficiency and safety, and embodies a high environmental value.

[0023] The specific manifestation of the high efficiency and flexibility of the implementation of the utility model is that it does not require any tools or pre-steps. When using it, you only need to stick the utility model in the appropriate position. The operation is simple and fast, which effectively saves the time and cost of installation; it avoids the trouble of carefully sticking when using adhesive sound insulation boards or sound insulation boards with double-sided tape. The magnetic adsorption installation method allows the installation position of the utility model to be adjusted at any time, and it can also be reused to increase its service life and reduce the user's cost of use; while traditional automobile sound insulation materials adhere to the body sheet metal through their viscosity or double-sided tape. Once attached, it is difficult to move the position. When moving or removing operations, it is difficult not to damage the sound insulation materials and the objects used, and it is very labor-intensive.

[0024] It needs to be further clarified that sound absorption and sound insulation are two related but different concepts, which have different goals and applications in noise control and acoustic treatment.

[0025] Sound absorption refers to the ability of a material or structure to absorb sound wave energy. Sound-absorbing materials can convert sound wave energy into heat or other forms of energy, thereby reducing the reflection and propagation of sound waves. Sound-absorbing materials are often used to control indoor noise and improve the acoustic environment to reduce echoes, resonances and noise transmission. The design and selection of sound-absorbing materials usually take frequency characteristics into consideration in order to provide maximum sound absorption within a specific frequency range.

[0026] Sound insulation refers to the ability to reduce the transmission of sound, preventing outside sound from entering or indoor sound from escaping. Sound insulation aims to block the propagation path of sound waves by using sound insulation materials and designing isolation structures, thereby reducing the transmission of noise. The goal of sound insulation is to create a relatively quiet environment by isolating and blocking noise sources from outside or inside. Sound insulation materials usually have high density and quality, which can effectively prevent the propagation of sound waves.

[0027] In summary, the goal of sound absorption is to reduce the reflection and resonance of sound waves and improve the indoor acoustic environment, while the goal of sound insulation is to prevent the spread of sound and create a relatively quiet environment. Sound absorption and sound insulation usually need to be used in combination, and appropriate materials and technologies should be selected according to specific needs and environments.

[0028] The sound absorption effect of cork mainly comes from its unique cell structure. The bark of cork is composed of many tiny pores, forming a honeycomb-like structure. These pores can absorb and scatter sound waves, effectively reducing the reflection and propagation of sound. When sound waves enter the cork material, part of the energy will be absorbed and converted into heat energy. This reduces the spread of noise in the indoor environment and improves the acoustic quality.

[0029] The soundproofing effect of cork is achieved through its density and structure. Cork has a relatively high density, which can reduce the transmission of sound. In addition, the cell structure of cork also plays a role in soundproofing. When sound waves propagate in cork, they encounter obstacles such as pores and cell walls, resulting in sound attenuation.

[0030] Generally, the cork particle board layer (6) in the composite sound-absorbing and insulating layer (1) is prone to breakage. The utility model ingeniously designs a composite structure of cork particles and rubber magnets, polyester fiber cloth or glass fiber cloth, effectively overcoming this drawback and achieving low bending strength and high bending toughness of the overall material.

[0031] When the cork composite material is subjected to bending, the rubber magnet can evenly transfer the force to the cork particles. This fully utilizes the high compressive strain and high tensile strain capacity of the cork material, and ultimately enables the entire material to exhibit excellent low bending strength and high bending toughness, providing a high-quality and environmentally friendly solution for many sound-absorbing and insulating scenes that require low bending strength and high bending toughness; similarly, the use of the polyester fiber cloth layer (4) and the glass fiber cloth layer (5) in the utility model also achieves the above effect; however, the above three are not beautiful when used directly as the surface layer, therefore, the cork cloth layer (3) in the composite sound-absorbing and insulating layer (1) can be used to customize cork cross-sections with various natural patterns, which can enhance the aesthetic performance and has the practicality of enhancing the surface friction damping of the utility model.

[0032] Rubber magnet is a kind of flexible elastomeric material. Due to its elastic sponge-like structure, it can effectively absorb and isolate low-frequency noise, such as engine noise, tire noise, etc. Cork is slightly weaker than rubber magnet in absorbing and isolating low-frequency noise. The sound absorption and insulation performance of rubber magnet is mainly manifested in low-medium frequency noise, while cork has more advantages in absorbing and isolating medium- and high-frequency noise. The two have complementary effects in absorbing and isolating low-, medium- and high-frequency noise.

[0033] It is worth noting that the static magnetic field brought by the rubber magnet may affect nearby electronic devices and cause concerns among users. In order to dispel such concerns, the implementation point of the utility model is set as a car, and the static magnetic field strength generated by the utility model is analyzed from three aspects: the relevant standard requirements for static magnetic field strength, the static magnetic field strength of the car itself, and the static magnetic field strength generated by the utility model. The precautions for applying the utility model are summarized.

[0034] According to China's GB / T 18387-2020 "Automotive Electrical and Electronic Equipment and Components - Electromagnetic Compatibility Requirements and Test Methods" standard, the anti-interference performance requirements for automotive electrical and electronic equipment and components in a static magnetic field environment are as follows: the maximum allowable static magnetic field strength is 50 millitesla.

[0035] According to the relevant provisions on the static magnetic field in the car in the Chinese national standard "Automotive Electromagnetic Compatibility Requirements and Test Methods" (GB / T 18655-2018), the static magnetic field intensity at the head and torso of the driver and passengers should not exceed 40 millitesla.

[0036] According to the international standard "CISPR 25", this standard mainly targets the electromagnetic compatibility requirements of on-board electronic equipment and components, which also includes regulations on static magnetic fields. Specifically, the static magnetic field intensity at the head and torso of the driver and passengers should not exceed 40 millitesla.

[0037] Modern cars all use good electromagnetic shielding design, which can effectively resist external static magnetic field interference. In addition, the main components of electric vehicles, such as motors and gearboxes, will shield the static magnetic field generated by themselves. The data can be used as a reference for static magnetic field strength and safe use. Specifically, the static magnetic field strength generated by the motor is reduced from 50-500 millitesla to 10-50 millitesla after shielding, and the static magnetic field strength of the gearbox can be reduced from 10-50 millitesla to 5-20 millitesla after shielding.

[0038] The static magnetic field strength of rubber magnets is usually weak, below 10 millitesla. Through the single-sided magnetization process, only the side used for attachment has magnetism, which can minimize the impact on objects in the car.

[0039] Through the above analysis of static magnetic field, rubber magnet is not a strong magnet. The magnetic field strength of rubber magnet has no effect or very limited effect on car passengers and electronic systems. However, due to the rigorous attitude towards safety, when the utility model is applied to automobiles, the magnetic field strength must be strictly controlled and monitored to comply with relevant safety standards to ensure user safety.

[0040] In summary, by adopting cork materials, the overall weight is significantly reduced, and the use of rubber soft magnetism makes the medium and high frequency noise absorption and isolation complementary to cork, realizing the enhancement of acoustic noise reduction function. At the same time, the use of friction damping and magnetic suction installation methods enhances the practical performance of the utility model and promotes the overall environmental protection. In general, without increasing the difficulty of production and construction, the utility model product achieves environmental protection, lightweight and excellent sound absorption and insulation performance, and also makes the installation and cleaning of sound-absorbing, sound-insulating and shock-absorbing panels easier. From raw materials, production to application, it has achieved the goal of environmental protection, low carbon and low emissions.

[0041] Finally, it should be noted that the sound insulation frequency provided by the traditional sound insulation board using a single material is biased. The present invention makes the sound absorption and sound insulation frequency more balanced and effective by superimposing multiple materials, and has the characteristics of reducing resonance and standing wave generation. Specifically, resonance is usually related to the repeated transmission and reflection of energy, so the sound absorption characteristics of the present invention can reduce the generation of resonance; because standing waves are usually related to the reflection of sound waves on a smooth plane, unlike the traditional sound insulation material with a smooth aluminum foil layer on the surface, the present invention can effectively reduce the generation of standing waves through the composite sound absorption and insulation layer (1). BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0043] Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7 The utility model provides a side structural schematic diagram of an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing plate for an automobile.

[0044] In the accompanying drawings, the structures of the present utility model are marked according to the following numbers 1 to 8 and their descriptions.

[0045] 1-Composite sound-absorbing and insulating layer

[0046] 2-Rubber soft magnetic layer

[0047] 3- Cork cloth layer

[0048] 4-Polyester fabric layer

[0049] 5-Fiberglass cloth layer

[0050] 6- Cork particle board layer

[0051] 7-Aluminum foil layer

[0052] 8-Butyl rubber layer DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0054] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0055] The utility model provides an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles, which can be applied to transportation vehicles, equipment rooms, etc. The sound-absorbing, sound-insulating and shock-absorbing board is in a cube shape, which is convenient for splicing and installation.

[0056] Example 1

[0057] As shown in FIG1 , an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles is a two-layer composite structure, which comprises a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2) from the outside to the inside. The thickness of the composite sound-absorbing and sound-insulating layer (1) is 3.8 mm, and the thickness of the rubber soft magnetic layer (2) is 0.5 mm.

[0058] Furthermore, the composite sound-absorbing and insulating layer (1) is a five-layer structure, wherein the first layer is a cork cloth layer (3) with a thickness of 0.2 mm, the second layer is a polyester fiber cloth layer (4) with a thickness of 0.2 mm, the third layer is a cork particle board layer (6) with a thickness of 3 mm, the fourth layer is a polyester fiber cloth layer (4) with a thickness of 0.2 mm, and the fifth layer is a cork cloth layer (3) with a thickness of 0.2 mm.

[0059] Furthermore, the rubber soft magnetic layer (2) has a thickness of 0.5 mm and is arranged inside the cork particle board layer (6).

[0060] Example 1 achieves excellent sound absorption and insulation performance and environmental protection characteristics while maintaining overall high softness.

[0061] Example 2

[0062] As shown in FIG2 , an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles is a two-layer composite structure, which comprises, from top to bottom, a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2). The thickness of the composite sound-absorbing and sound-insulating layer (1) is 3.4 mm, and the thickness of the rubber soft magnetic layer (2) is 0.5 mm.

[0063] Furthermore, the composite sound-absorbing and insulating layer (1) is a three-layer structure, wherein the first layer is a cork cloth layer (3) with a thickness of 0.2 mm, the second layer is a glass fiber cloth layer (5) with a thickness of 0.2 mm, and the third layer is a cork particle board layer (6) with a thickness of 3 mm.

[0064] Furthermore, the rubber soft magnetic layer (2) has a thickness of 0.5 mm and is disposed on the lower surface of the cork particle board layer (6).

[0065] In Example 2, glass fiber cloth has stronger tensile strength and compressive resistance than polyester fiber. At the same time, in the scheme, the rubber soft magnetic layer (2) is directly arranged on the lower surface of the cork particle board layer (6), without an additional polyester fiber cloth layer or glass fiber cloth layer and cork cloth covering its lower surface. This design simplifies the manufacturing process and reduces the overall manufacturing cost, while still maintaining most of the excellent properties of the sound-absorbing, sound-insulating and vibration-damping board.

[0066] Example 3

[0067] As shown in FIG3 , an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles is a two-layer composite structure, which comprises a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2) from the outside to the inside. The thickness of the composite sound-absorbing and sound-insulating layer (1) is 3.2 mm, and the thickness of the rubber soft magnetic layer (2) is 0.5 mm.

[0068] Furthermore, the composite sound-absorbing and insulating layer (1) is a three-layer structure, wherein the first layer is an aluminum foil layer (7) having a thickness of 0.2 mm, the second layer is a butyl rubber layer (8) having a thickness of 1 mm, and the third layer is a cork particle board layer (6) having a thickness of 2 mm.

[0069] Furthermore, the rubber soft magnetic layer (2) has a thickness of 0.5 mm and is arranged inside the cork particle board layer (6).

[0070] Example 3 Unlike the traditional automobile sound insulation material which uses butyl rubber as the main raw material, the cork particle board layer (6) added in the solution can absorb sound more evenly and effectively. At the same time, the addition of the rubber soft magnetic layer (2) can effectively improve the problem that butyl rubber is difficult to clean after aging on the car body. Although the addition of the aluminum foil layer (7) and the butyl rubber layer (8) makes the overall manufacturing cost higher, thanks to the use of traditional sound insulation materials, it is more easily accepted by the existing market environment and users.

[0071] Example 4

[0072] As shown in FIG4 , an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles is a two-layer composite structure, which comprises a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2) from top to bottom or from outside to inside. The thickness of the composite sound-absorbing and sound-insulating layer (1) is 10.5 mm, and the thickness of the rubber soft magnetic layer (2) is 1 mm.

[0073] Furthermore, the composite sound-absorbing and insulating layer (1) is a two-layer structure, wherein the first layer is a cork cloth layer (3) having a thickness of 0.5 mm, and the second layer is a cork particle board layer (6) having a thickness of 10 mm.

[0074] Furthermore, the rubber soft magnetic layer (2) has a thickness of 1 mm and is disposed on the lower surface of the cork particle board layer (6).

[0075] Example 4 A thicker cork particle board layer (6) is used to achieve high sound absorption and insulation requirements in specific scenarios where low bending strength is not required. The thicker cork particle board layer (6) increases the bending strength and overall rigidity of this example. Therefore, a polyester fiber cloth layer (4) or a glass fiber cloth layer (5) is not provided in this example.

[0076] Example 5

[0077] As shown in FIG5 , an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles is a two-layer composite structure, which comprises a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2) from the outside to the inside. The thickness of the composite sound-absorbing and sound-insulating layer (1) is 3.6 mm, and the thickness of the rubber soft magnetic layer (2) is 0.5 mm.

[0078] Furthermore, the composite sound-absorbing and insulating layer (1) is a four-layer structure, wherein the first layer is a cork cloth layer (3) with a thickness of 0.2 mm, the second layer is a cork particle board layer (6) with a thickness of 3 mm, the third layer is a glass fiber cloth layer (5) with a thickness of 0.2 mm, and the fourth layer is a cork cloth layer with a thickness of 0.2 mm.

[0079] Furthermore, the rubber soft magnetic layer (2) has a thickness of 0.5 mm and is arranged inside the cork particle board layer (6) in the composite sound-absorbing and sound-insulating layer (1).

[0080] Example 5 By arranging a glass fiber cloth layer (5) on the lower surface of the cork particle board layer (6), the low bending strength and high bending toughness of the material when force is applied below the horizontal direction on both sides are enhanced to meet specific installation requirements.

[0081] Example 6

[0082] As shown in FIG6 , an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles is a two-layer composite structure, which comprises a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2) from the outside to the inside. The thickness of the composite sound-absorbing and sound-insulating layer (1) is 3 mm, and the thickness of the rubber soft magnetic layer (2) is 0.5 mm.

[0083] Furthermore, the composite sound-absorbing and insulating layer (1) is a one-layer structure, wherein the first layer is a cork particle board layer (6) having a thickness of 3 mm.

[0084] Furthermore, the rubber soft magnetic layer (2) has a thickness of 0.5 mm and is arranged inside the cork particle board layer (6) in the composite sound-absorbing and sound-insulating layer (1).

[0085] This example is suitable for situations where the sound insulation material does not require low bending strength, high bending toughness and aesthetics, but requires the material to have high overall durability, such as application environments such as equipment rooms. In such application environments, since the rubber soft magnetic layer (2) is arranged in the internal cork particle board layer (6) of the composite sound-absorbing and insulating layer (1), this design can provide protection for the rubber soft magnetic layer (2), and even if the edge of the material is bent or damaged, it will not cause systemic damage.

[0086] Example 7

[0087] As shown in FIG. 7 , an environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles is a two-layer composite structure, which comprises a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2) from the outside to the inside. The thickness of the composite sound-absorbing and sound-insulating layer (1) is 4 mm, and the thickness of the rubber soft magnetic layer (2) is 0.5 mm.

[0088] Furthermore, the composite sound-absorbing and insulating layer (1) is a two-layer structure, wherein the first layer is an aluminum foil layer (7) having a thickness of 1 mm, and the second layer is a cork particle board layer (6) having a thickness of 3 mm.

[0089] Furthermore, the rubber soft magnetic layer (2) has a thickness of 0.5 mm and is arranged inside the cork particle board layer (6) in the composite sound-absorbing and sound-insulating layer (1).

[0090] In this example, an aluminum foil layer (7) is provided on the upper surface of the cork particle board layer (6), thereby enhancing the waterproof, moisture-proof, flame-retardant and scratch-resistant properties of the cork particle board layer (6), thereby making it suitable for more severe application environments.

[0091] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model.

Claims

1. An environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles, characterized by: The environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing plate for automobiles is a composite structure, which comprises, from top to bottom or from outside to inside, a composite sound-absorbing and sound-insulating layer (1) and a rubber soft magnetic layer (2); The composite sound-absorbing and insulating layer (1) comprises at least a cork particle board layer (6) and 0 to 4 additional layers, wherein the additional layer is one of a cork cloth layer (3), a polyester fiber cloth layer (4), a glass fiber cloth layer (5), an aluminum foil layer (7) and a butyl rubber layer (8); When the number of additional layers of the composite sound-absorbing and sound-insulating layer (1) is 4, First layer: cork cloth layer (3), second layer: polyester fiber cloth layer (4) or glass fiber cloth layer (5), third layer: cork particle board layer (6), fourth layer: polyester fiber cloth layer (4) or glass fiber cloth layer (5), fifth layer: cork cloth layer (3), Or the first layer: aluminum foil layer (7), the second layer: butyl rubber layer (8), the third layer: cork particle board layer (6), the fourth layer: polyester fiber cloth layer (4) or glass fiber cloth layer (5), the fifth layer: cork cloth layer (3); When the number of additional layers of the composite sound-absorbing and sound-insulating layer (1) is 3, First layer: cork cloth layer (3), second layer: polyester fiber cloth layer (4) or glass fiber cloth layer (5), third layer: cork particle board layer (6), fourth layer: cork cloth layer (3), or first layer: cork cloth layer (3), second layer: cork particle board layer (6), third layer: polyester fiber cloth layer (4) or glass fiber cloth layer (5), fourth layer: cork cloth layer (3), Or the first layer: aluminum foil layer (7), the second layer: butyl rubber layer (8), the third layer: cork particle board layer (6), the fourth layer: cork cloth layer (3); When the number of additional layers of the composite sound-absorbing and sound-insulating layer (1) is 2, First layer: cork cloth layer (3), second layer: cork particle board layer (6), third layer: cork cloth layer (3), Or the first layer: aluminum foil layer (7), the second layer: butyl rubber layer (8), the third layer: cork particle board layer (6); When the number of additional layers of the composite sound-absorbing and sound-insulating layer (1) is 1, First layer: cork cloth layer (3), second layer: cork particle board layer (6), Or first layer: aluminum foil layer (7), second layer: cork particle board layer (6), Or the first layer: a cork particle board layer (6), the second layer: a butyl rubber layer (8); When the number of additional layers of the composite sound-absorbing and sound-insulating layer (1) is 0, First layer: cork particle board layer (6); The rubber soft magnetic layer (2) is arranged on the lower surface of the composite sound-absorbing and sound-insulating layer (1), or is arranged inside the cork particle board layer (6).

2. The environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles according to claim 1 is characterized by: The thickness of the composite sound-absorbing and insulating layer (1) is 1-50 mm. In further detail, the thickness of the cork cloth layer (3) in the composite sound-absorbing and insulating layer (1) is 0.1-3 mm; the thickness of the polyester fiber cloth layer (4) and the glass fiber cloth layer (5) is 0.1-3 mm; the thickness of the cork particle board layer (6) is 1-50 mm; the thickness of the aluminum foil layer (7) is 0.1-3 mm; and the thickness of the butyl rubber layer (8) is 0.1-5 mm.

3. The environmentally friendly magnetic lightweight sound-absorbing, sound-insulating and shock-absorbing board for automobiles according to claim 1 is characterized by: The thickness of the rubber soft magnetic layer (2) is 0.1-5 mm.

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