Damping sheet for a vehicle

Abstract

The utility model relates to the field of damping rubber sheet, specifically disclose a damping rubber sheet for car, including damping rubber sheet main part, damping rubber sheet main part includes from top to bottom sequentially arranged corrosion -resistant protective layer, reinforcing layer, double damping layer, magnetic composite layer, first adhesive layer, double damping layer includes laminated arrangement and close reinforcing layer's upper damping layer, far away reinforcing layer's lower damping layer, the upper damping layer, lower damping layer all are provided with a plurality of sound absorption holes, the porosity of upper damping layer is greater than the porosity of lower damping layer. Double damping layer can carry out graded absorption and processing to the noise of different frequency, and the larger porosity of upper damping layer is favorable to absorb middle high frequency noise, and the smaller porosity of lower damping layer has better absorption effect to low frequency noise, thereby can effectively widen the noise reduction frequency band of this damping rubber sheet, significantly improve the overall noise reduction performance, can effectively reduce various noises in the car, create a quiet and comfortable in-car environment for the driver and passenger.

Description

Technical Field

[0001] This utility model relates to the field of damping films, and in particular to a damping film for automobiles. Background Technology

[0002] Damping film, also known as putty or damping block, is a viscoelastic material that is applied to the inner surface of a car body. It is attached tightly to the steel plate wall of the car body and is mainly used to reduce noise and vibration, that is, to provide damping.

[0003] Traditional damping films typically employ a single-layer structure for noise reduction, with a simple sound-absorbing hole design that can only absorb mid-to-high frequency noise. However, their ability to handle low-frequency noise (such as engine noise) is limited, making it difficult to meet the requirements for noise reduction across the entire frequency range. Utility Model Content

[0004] The purpose of this invention is to provide a damping film for automobiles, so as to solve the technical problems of the existing damping film having a single sound absorption hole design and limited absorption of low-frequency noise.

[0005] To solve the above problems, the present invention provides a damping film for automobiles, which adopts the following technical solution: it includes a damping film body, which includes a corrosion-resistant protective layer, a reinforcing layer, a double damping layer, a magnetic composite layer, and a first adhesive layer arranged sequentially from top to bottom. The double damping layer includes an upper damping layer arranged in layers and close to the reinforcing layer and a lower damping layer far from the reinforcing layer. Both the upper and lower damping layers are provided with a number of sound-absorbing holes, and the porosity of the upper damping layer is greater than that of the lower damping layer.

[0006] Furthermore, the sound-absorbing holes extend to the top end face of the reinforcing layer to form a composite sound-absorbing channel that runs through the reinforcing layer and the double damping layer.

[0007] Furthermore, a release paper is bonded to the end face of the first adhesive layer away from the magnetic composite layer. The length direction of the release paper is defined as the direction in which the release paper is parallel to the plane of the damping film and extends along the longest dimension of the release paper. An easy-tear line is provided in the length direction of the release paper. The easy-tear line is used to form a tearable narrow strip for boundary positioning.

[0008] Furthermore, the corrosion-resistant protective layer, the reinforcing layer, the double damping layer, the magnetic composite layer, and the first adhesive layer are sequentially hot-pressed and composited into an integral structure.

[0009] Furthermore, the corrosion-resistant protective layer is made of polytetrafluoroethylene film.

[0010] Furthermore, the reinforcing layer is made of glass fiber cloth reinforced epoxy resin composite material.

[0011] Furthermore, the double damping layer is made of butyl rubber matrix filled with mica powder, and the sound-absorbing holes are hexagonal honeycomb holes.

[0012] Furthermore, the magnetic composite layer is made of a blend of neodymium iron boron magnetic powder and butyl rubber.

[0013] Furthermore, the first adhesive layer is made of acrylic pressure-sensitive adhesive, and adhesive protrusions are provided on the side of the first adhesive layer away from the magnetic composite layer.

[0014] Furthermore, a second adhesive layer is provided on the end face of the corrosion-resistant protective layer away from the reinforcing layer.

[0015] The beneficial effects of the damping film for automobiles provided by this utility model are:

[0016] 1. The dual damping layer can absorb and process noise of different frequencies in a graded manner. The larger porosity of the upper damping layer is conducive to absorbing mid-to-high frequency noise, while the smaller porosity of the lower damping layer has a better absorption effect on low frequency noise. This can effectively broaden the noise reduction frequency band of the damping film, significantly improve the overall noise reduction performance, and effectively reduce various noises inside the car, creating a quiet and comfortable in-car environment for drivers and passengers.

[0017] 2. Composite sound-absorbing channels can increase the propagation path of sound waves inside the material, causing the sound waves to be reflected and absorbed multiple times during propagation, further enhancing the sound absorption effect of the material and improving noise reduction efficiency;

[0018] 3. Through the rational selection of materials for each layer and the optimization of structural design, this damping film has good corrosion resistance and high structural strength, achieving a comprehensive breakthrough in environmental protection, durability, noise reduction, convenient construction and lightweighting. Attached Figure Description

[0019] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of a damping film for automobiles according to the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a double damping layer of a damping film for automobiles according to the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the first adhesive layer of a damping film for automobiles according to the present invention.

[0023] Figure 4 This is a schematic diagram of the release paper for a damping film used in automobiles according to this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Corrosion-resistant protective layer;

[0026] 2. Reinforcement layer;

[0027] 3. Double damping layer; 31. Upper damping layer; 32. Lower damping layer; 33. Sound absorption holes;

[0028] 4. Magnetic composite layer;

[0029] 5. First adhesive layer; 51. Adhesive protrusions;

[0030] 6. Release paper; 61. Tear line;

[0031] 7. Second adhesive layer. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.

[0034] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0035] This utility model provides a damping film for automobiles, such as... Figures 1 to 4As shown, the damping film includes a main body, which comprises, from top to bottom, a corrosion-resistant protective layer 1, a reinforcing layer 2, a double damping layer 3, a magnetic composite layer 4, and a first adhesive layer 5. The corrosion-resistant protective layer 1 blocks external erosion and protects the internal functional layers; the reinforcing layer 2 provides mechanical support to prevent the double damping layer 3 from failing due to vibration deformation; the double damping layer 3 effectively enhances the damping effect; the magnetic composite layer 4 and the first adhesive layer 5 form a dual fixing mechanism, effectively increasing the stability of the damping film and ensuring it does not detach under complex working conditions. This damping film, through the vertical stacking of five layers, constructs a complete technical system from environmental protection to structural fixation. Each layer has complementary functions, avoiding the shortcomings of a single material. Vibration energy is sequentially transmitted through the first adhesive layer 5 (rigid transmission), the magnetic composite layer 4 (hysteresis loss), the double damping layer 3 (viscoelastic damping), the reinforcing layer 2 (structural dispersion), and the corrosion-resistant protective layer 1 (surface attenuation), forming a multi-level energy dissipation mechanism.

[0036] In this embodiment, the dual damping layer 3 includes an upper damping layer 31 stacked close to the reinforcing layer 2 and a lower damping layer 32 far from the reinforcing layer 2. Both the upper damping layer 31 and the lower damping layer 32 are provided with a plurality of sound-absorbing holes 33. The porosity of the upper damping layer 31 is greater than that of the lower damping layer 32. The dual damping layer 3 can absorb and process noise of different frequencies in a graded manner. The larger porosity of the upper damping layer 31 is conducive to absorbing mid-to-high frequency noise, while the smaller porosity of the lower damping layer 32 has a better absorption effect on low frequency noise. This can effectively broaden the noise reduction frequency band of the damping film, significantly improve the overall noise reduction performance, and effectively reduce various noises inside the car, creating a quiet and comfortable in-car environment for drivers and passengers.

[0037] In this embodiment, the sound-absorbing hole 33 extends to the top end face of the reinforcing layer 2 to form a composite sound-absorbing channel that penetrates the reinforcing layer 2 and the double damping layer 3. The composite sound-absorbing channel can increase the propagation path of sound waves inside the material, so that the sound waves are reflected and absorbed multiple times during propagation, further enhancing the sound absorption effect of the material and improving the noise reduction efficiency.

[0038] In this embodiment, the sound-absorbing hole 33 is a hexagonal honeycomb hole, and the stress on the hole wall is uniformly set.

[0039] In this embodiment, release paper 6 is bonded to the side of the first adhesive layer 5 away from the magnetic composite layer 4. The length direction of the release paper is defined as the direction in which the release paper extends parallel to the plane of the damping film and along its longest dimension. An easy-tear line 61 is provided along the length direction of the release paper 6. The easy-tear line 61 is used to form a tearable narrow strip for boundary positioning. In this embodiment, the easy-tear line 61 is an indentation line or a weak adhesive line. The damping film can achieve initial adsorption and positioning through the magnetic composite layer 4. The release paper 6 serves as a temporary isolation layer between the damping film and the vehicle body. Its indentation line or weak adhesive line design facilitates tearing off the narrow strip. The exposed area of ​​the adhesive layer 5 after tearing forms a physical positioning reference edge, ensuring that the bonding boundary of the damping film is precisely aligned with the sheet metal edge of the vehicle body. In use, the operator can tear off the narrow strip of the release paper 6 as a boundary reference, align the edge of the damping film with the narrow strip, and then bond it.

[0040] In this embodiment, the corrosion-resistant protective layer 1, the reinforcing layer 2, the double damping layer 3, the magnetic composite layer 4, and the first adhesive layer 5 are sequentially hot-pressed together to transform the five layers of materials into an integrated structure with integrated functions, synergistic performance, and high manufacturing efficiency.

[0041] In this embodiment, the corrosion-resistant protective layer 1 is made of polytetrafluoroethylene film, which can resist the erosion of acids, alkalis, salt spray and organic solvents, and is also resistant to high temperatures, has a low coefficient of friction, and can effectively prevent fretting wear between the film and the body sheet metal due to vibration friction, thus extending its service life; the reinforcing layer 2 is made of glass fiber cloth reinforced epoxy resin composite material, which can effectively improve impact resistance and deformation resistance; the double damping layer 3 is made of butyl rubber matrix filled with mica powder; the magnetic composite layer 4 is made of neodymium iron boron magnetic powder and butyl rubber blend; and the first adhesive layer 5 is made of acrylic pressure-sensitive adhesive. This damping film completely avoids harmful substances such as asphalt and solvent-based adhesives, is green and environmentally friendly, reduces production costs, and is resistant to high and low temperatures, has a wide damping temperature range, and low dynamic heat generation.

[0042] In this embodiment, the first adhesive layer 5 has adhesive protrusions 51 on the side face away from the magnetic composite layer 4. The magnetic composite layer 4 provides initial adsorption force to achieve zero-deviation positioning during construction. The adhesive protrusions 51 form micro-mechanical interlocks to improve peel strength.

[0043] In this embodiment, a second adhesive layer 7 is provided on the end face of the corrosion-resistant protective layer 1 away from the reinforcing layer 2. The surface of the damping film is covered with a peelable anti-adhesive release film, which can be directly pasted onto components such as door anti-collision strips and wheel arch trim panels. This makes the damping film form a six-layer synergistic system of "adhesion-protection-support-energy dissipation-fixation-connection". Through bidirectional adhesion, the damping film and the adhered object are fixed by "mechanical interlocking + chemical bonding", directly connecting the corrosion-resistant protective layer 1 and the adhered object to form a closed-loop force transmission path, so that the interface stress is set uniformly.

[0044] The damping film for automobiles provided by this utility model achieves a comprehensive breakthrough in noise reduction performance, durability, ease of construction and environmental protection through layered functional integration, material innovation and structural optimization, and has high feasibility.

[0045] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0046] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A damping film for automobiles, comprising a damping film body, characterized in that, The damping film body includes, from top to bottom, a corrosion-resistant protective layer, a reinforcing layer, a double damping layer, a magnetic composite layer, and a first adhesive layer. The double damping layer includes an upper damping layer stacked on top of the reinforcing layer and a lower damping layer away from the reinforcing layer. Both the upper and lower damping layers are provided with several sound-absorbing holes, and the porosity of the upper damping layer is greater than that of the lower damping layer.

2. The damping film for automobiles according to claim 1, characterized in that, The sound-absorbing holes extend to the top end face of the reinforcing layer to form a composite sound-absorbing channel that runs through the reinforcing layer and the double damping layer.

3. The damping film for automobiles according to claim 1, characterized in that, Release paper is bonded to the side of the first adhesive layer away from the magnetic composite layer. The length direction of the release paper is the direction in which the release paper is parallel to the plane of the damping film and extends along the longest dimension of the release paper. Tear lines are provided in the length direction of the release paper. The tear lines are used to form a tearable narrow strip for boundary positioning.

4. A damping film for automobiles according to any one of claims 1 to 3, characterized in that, The corrosion-resistant protective layer, the reinforcing layer, the double damping layer, the magnetic composite layer, and the first adhesive layer are sequentially hot-pressed and molded into an integral structure.

5. A damping film for automobiles according to any one of claims 1 to 3, characterized in that, The corrosion-resistant protective layer is made of polytetrafluoroethylene film.

6. A damping film for automobiles according to any one of claims 1 to 3, characterized in that, The reinforcing layer is made of glass fiber cloth reinforced epoxy resin composite material.

7. A damping film for automobiles according to any one of claims 1 to 3, characterized in that, The double damping layer is made of butyl rubber matrix filled with mica powder, and the sound absorption holes are hexagonal honeycomb holes.

8. A damping film for automobiles according to any one of claims 1 to 3, characterized in that, The magnetic composite layer is made of a blend of neodymium iron boron magnetic powder and butyl rubber.

9. A damping film for automobiles according to any one of claims 1 to 3, characterized in that, The first adhesive layer is made of acrylic pressure-sensitive adhesive, and adhesive protrusions are provided on the end face of the first adhesive layer away from the magnetic composite layer.

10. A damping film for automobiles according to any one of claims 1 to 3, characterized in that, A second adhesive layer is provided on the end face of the corrosion-resistant protective layer away from the reinforcing layer.

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