Graphite modified closed cell foamed soundproofing rubber mat

Abstract

The utility model discloses a kind of graphite modified closed-cell sound insulation rubber pad, including closed-cell rubber pad main body, closed-cell rubber pad main body is sequentially from top to bottom for surface layer, intermediate sound insulation layer and bottom layer, first interface reinforcing layer is equipped between surface layer and intermediate sound insulation layer, second interface reinforcing layer is equipped between intermediate sound insulation layer and bottom layer, nano composite damping layer is equipped between first interface reinforcing layer and intermediate sound insulation layer, bottom layer is equipped with multiple groups of through-hole. The utility model is located in the wall material between closed-cell by the through-hole design of bottom layer, and staggered oblique distribution is presented, both do not destroy the overall structure of closed-cell, and can also disperse bottom layer stress;Through each layer aperture and density gradient design, realize the efficient barrier to sound wave;Polydopamine grafting graphite microsheet is introduced to form microtooth array between interlayer, through hydrogen bond and mechanical interlocking dual effect, avoid delamination in use process.

Description

Technical Field

[0001] This utility model relates to a foamed sound-insulating rubber pad device, specifically a graphite-modified closed-cell foamed sound-insulating rubber pad, belonging to the field of polymer composite material technology. Background Technology

[0002] Rubber products are high-molecular-weight compound products with high elasticity, high tensile strength, and high insulation. They also have properties such as waterproofing, flame retardancy, acid and alkali resistance, insect resistance, lightweight, heat insulation, sound insulation, and shock absorption.

[0003] With the increasing severity of noise pollution, the demand for high-efficiency sound insulation materials in the construction and automotive industries is becoming increasingly urgent. Traditional rubber and plastic foam sound insulation materials suffer from problems such as poor low-frequency sound insulation (sound wave absorption efficiency below 500Hz <30%), weak interlayer bonding (peel strength <3N / mm), and insufficient environmental friendliness (containing halogenated flame retardants or organic solvent residues). In existing technologies, single-gradient structural designs are insufficient to meet broadband sound insulation requirements, while simple composite processes are prone to interlayer delamination.

[0004] Therefore, there is an urgent need to develop a new type of sound-insulating rubber pad that combines wide-band sound insulation, strong interface bonding, and green environmental protection. Utility Model Content

[0005] The purpose of this invention is to provide a graphite-modified closed-cell foamed sound-insulating rubber pad to solve the above-mentioned problems.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a graphite-modified closed-cell foamed sound-insulating rubber pad, comprising a closed-cell rubber pad body, wherein the closed-cell rubber pad body comprises, from top to bottom, a surface layer, a middle sound-insulating layer and a bottom layer, wherein a first interface reinforcement layer is provided between the surface layer and the middle sound-insulating layer, and a second interface reinforcement layer is provided between the middle sound-insulating layer and the bottom layer, wherein a nano-composite damping layer is provided between the first interface reinforcement layer and the middle sound-insulating layer, and the bottom layer is provided with multiple sets of through holes;

[0007] The surface layer, the middle sound insulation layer, and the bottom layer are respectively provided with a first pore size, a second pore size, and a third pore size. The pore sizes of the first pore size, the second pore size, and the third pore size are distributed in a gradient manner. The first interface reinforcement layer is composed of a first polydopamine-grafted graphite microsheet, and the second interface reinforcement layer is composed of a second polydopamine-grafted graphite microsheet.

[0008] Preferably, the tooth height of the first polydopamine-grafted graphite microsheet is 5-7 μm, and the tooth height of the second polydopamine-grafted graphite microsheet is 7-10 μm.

[0009] Preferably, the size of the first pore is 50-100 μm and the closed-cell rate of the first pore is >95%; the size of the second pore is 150-300 μm and the closed-cell rate of the second pore is 85-90%; the size of the third pore is 500-800 μm and the closed-cell rate of the third pore is 75-80%; and a fourth pore is provided on the nanocomposite damping layer, the size of the fourth pore being 80-150 μm.

[0010] Preferably, the thickness of the surface layer is 0.3-0.5 mm, the thickness of the intermediate sound insulation layer is 1.5-2.0 mm, the thickness of the bottom layer is 3.0-4.0 mm, the thickness of the interface reinforcement layer is 0.05-0.1 mm, and the thickness of the nanocomposite damping layer is 0.5-0.8 mm.

[0011] Preferably, the through hole is inclined, and the inclination angle of the through hole is 30-45°.

[0012] The beneficial effects of this utility model are:

[0013] 1. The through-hole design of the bottom layer is located in the wall material between the closed holes and is distributed in an alternating and inclined manner, which not only does not destroy the overall structure of the closed holes, but also disperses the stress on the bottom layer.

[0014] 2. Through the design of pore size and density gradient in each layer, it achieves efficient sound wave blocking of 100-5000Hz, especially the sound insulation of low frequency 125Hz is improved by more than 77% compared with traditional materials;

[0015] 3. Polydopamine-grafted graphite microsheets are introduced between the layers to form a micro-tooth array (tooth height 5-10μm). Through the dual action of hydrogen bonding and mechanical interlocking, the interlayer peel strength is ≥8N / mm, avoiding delamination during use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of the overall structure of a graphite-modified closed-cell foamed sound-insulating rubber pad proposed in this utility model.

[0017] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle;

[0018] Figure 3 This is a three-dimensional view of a graphite-modified closed-cell foamed sound-insulating rubber pad with through-hole structure proposed in this utility model.

[0019] Figure 4 This is a three-dimensional view of a graphite-modified closed-cell foamed sound-insulating rubber pad with through-hole structure proposed in this utility model.

[0020] In the figure: 1. Closed-cell rubber pad body; 2. Surface layer; 201. First pore size; 3. Middle sound insulation layer; 301. Second pore size; 4. Bottom layer; 401. Third pore size; 402. Through hole; 5. First interface reinforcement layer; 501. First polydopamine-grafted graphite microsheet; 6. Second interface reinforcement layer; 601. Second polydopamine-grafted graphite microsheet; 7. Nanocomposite damping layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1, see Figure 1-4 As shown, a graphite-modified closed-cell foamed sound-insulating rubber pad includes a closed-cell rubber pad body 1. The closed-cell rubber pad body 1 consists of a surface layer 2, a middle sound-insulating layer 3, and a bottom layer 4 from top to bottom. A first interface reinforcement layer 5 is provided between the surface layer 2 and the middle sound-insulating layer 3. A second interface reinforcement layer 6 is provided between the middle sound-insulating layer 3 and the bottom layer 4. A nano-composite damping layer 7 is provided between the first interface reinforcement layer 5 and the middle sound-insulating layer 3. Multiple sets of through holes 402 are provided on the bottom layer 4.

[0023] The surface layer 2, the middle sound insulation layer 3, and the bottom layer 4 are respectively provided with a first pore size 201, a second pore size 301, and a third pore size 401. The pore sizes of the first pore size 201, the second pore size 301, and the third pore size 401 are distributed in a gradient manner. The first interface reinforcement layer 5 is composed of a first polydopamine-grafted graphite microsheet 501, and the second interface reinforcement layer 6 is composed of a second polydopamine-grafted graphite microsheet 601.

[0024] The size of the first pore 201 is 50-100μm, and the closed-cell rate of the first pore 201 is >95%. The size of the second pore 301 is 150-300μm, and the closed-cell rate of the second pore 301 is 85-90%. The size of the third pore 401 is 500-800μm, and the closed-cell rate of the third pore 401 is 75-80%. A fourth pore 701 with a size of 80-150μm is provided on the nanocomposite damping layer 7.

[0025] The thickness of the surface layer 2 is 0.3-0.5mm, the thickness of the middle sound insulation layer 3 is 1.5-2.0mm, the thickness of the bottom layer 4 is 3.0-4.0mm, the thickness of the interface reinforcement layer 5 is 0.05-0.1mm, and the thickness of the nanocomposite damping layer 7 is 0.5-0.8mm.

[0026] Based on the above embodiments, it should be noted that: the surface layer 2 is based on hydrogenated nitrile rubber, with added silicon carbide whiskers and graphite modified rubber powder to form a dense closed-cell structure with a closed-cell rate of >95%; the hydrogenated nitrile rubber has excellent weather resistance, the silicon carbide whiskers can improve the surface wear resistance (DIN wear amount ≤50mm³), and the graphite modified rubber powder and the small-diameter structure work together to reflect high-frequency sound waves, protecting the internal structure from external impacts.

[0027] The middle sound insulation layer 3 is mainly composed of EVA, combined with natural rubber and a high proportion of graphite modified rubber powder, with a moderate pore size of 150-300μm. The damping performance of EVA and the blocking effect of graphite can effectively dissipate mid-frequency sound waves, while buffering the stress transmission between layers and avoiding local stress concentration.

[0028] The bottom layer 4 uses natural rubber as the base material, with hollow glass microspheres and graphite-modified rubber powder added to form a large-pore structure of 500-800μm. The high elasticity of natural rubber and the porous characteristics of hollow glass microspheres can enhance the absorption of low-frequency sound waves. Combined with anti-slip additives, it can increase the friction with the contact surface and prevent the rubber pad from sliding.

[0029] The first interface reinforcement layer 5 and the second interface reinforcement layer 6 are mainly composed of the first polydopamine-grafted graphite microsheet 501 and the second polydopamine-grafted graphite microsheet 601, which form a micro-tooth structure through oxidation self-polymerization. The amino and hydroxyl groups on the surface can form hydrogen bonds with the polar groups of the adjacent layers. The micro-tooth embedding effect enhances mechanical interlocking and improves the bonding force between layers.

[0030] The nanocomposite damping layer 7 serves as a transitional functional layer between the surface layer 2 and the intermediate sound insulation layer 3. Through the synergistic effect of the nanoscale composite of graphite and montmorillonite, it efficiently dissipates mid-to-high frequency sound waves of 1500-2500Hz while buffering interlayer stress.

[0031] Example 2, see Figure 1-2 As shown, a graphite-modified closed-cell foamed sound-insulating rubber pad includes a first polydopamine-grafted graphite microsheet 501 and a second polydopamine-grafted graphite microsheet 601, both forming a micro-tooth array. The tooth height of the first polydopamine-grafted graphite microsheet 501 is 5-7 μm, and the tooth height of the second polydopamine-grafted graphite microsheet 601 is 7-10 μm.

[0032] According to the above embodiments, it should be noted that the micro-tooth array of the first polydopamine-grafted graphite microplate 501 and the second polydopamine-grafted graphite microplate 601 is a three-dimensional structure that is naturally formed by spraying a suspension of polydopamine-grafted graphite microplate 501 onto the upper and lower surfaces of the intermediate sound insulation layer 3 and then drying it.

[0033] The first polydopamine-grafted graphite microsheet 501 and the second polydopamine-grafted graphite microsheet 601 form covalent bonds with the hydroxyl groups on the graphite surface after the catechol groups are oxidized to quinone groups by the oxidative self-polymerization of polydopamine. This forms uniformly dense micro-tooths in the first interface reinforcement layer 5 and the second reinforcement layer 6, with about 1000-1500 micro-tooths distributed per square millimeter, ensuring the stress balance between the layers.

[0034] The 5-10 μm high teeth of the first polydopamine-grafted graphite microsheet 501 and the second polydopamine-grafted graphite microsheet 601 array can be deeply embedded in the pores of the foamed structure of the surface and bottom layers, forming a mechanical interlocking effect similar to "anchoring". When the layers are subjected to peeling force, the physical interlocking between the micro-teeth of the polydopamine-grafted graphite microsheet 501 and the adjacent layers will generate significant shear resistance.

[0035] Example 3, see Figure 3-4 As shown, a graphite-modified closed-cell foamed sound-insulating rubber pad includes through holes 402 arranged in an inclined manner.

[0036] According to the above embodiments, it should be noted that the angle of the through hole 402 is 30-45° and it adopts an "interlaced tilt" layout.

[0037] The starting end of the through hole 402 opens on the upper surface of the bottom layer 4, that is, on the side close to the second interface reinforcement layer 6. The end of the through hole 403 is connected to the cavity wall of the third aperture 401, but does not penetrate the closed hole of the third aperture 401, and only forms an opening with a diameter of 50-100μm on the wall material.

[0038] This design makes the through hole 402 a "bridge" connecting the surface of the bottom layer 4 and the internal closed holes, ensuring that sound waves can quickly enter the closed hole cavity after entering from the surface, so that the sound waves are attenuated multiple times in different closed holes, further improving the sound insulation effect.

Claims

1. A graphite-modified closed-cell foamed sound-insulating rubber pad, comprising a closed-cell rubber pad body (1), characterized in that: The closed-cell rubber pad body (1) consists of a surface layer (2), a middle sound insulation layer (3) and a bottom layer (4) from top to bottom. A first interface reinforcement layer (5) is provided between the surface layer (2) and the middle sound insulation layer (3). A second interface reinforcement layer (6) is provided between the middle sound insulation layer (3) and the bottom layer (4). A nano-composite damping layer (7) is provided between the first interface reinforcement layer (5) and the middle sound insulation layer (3). Multiple sets of through holes (402) are provided on the bottom layer (4). The surface layer (2), the middle sound insulation layer (3), and the bottom layer (4) are respectively provided with a first pore size (201), a second pore size (301), and a third pore size (401). The pore sizes of the first pore size (201), the second pore size (301), and the third pore size (401) are distributed in a gradient manner. The first interface reinforcement layer (5) is composed of a first polydopamine-grafted graphite microplate (501), and the second interface reinforcement layer (6) is composed of a second polydopamine-grafted graphite microplate (601).

2. The graphite-modified closed-cell foamed sound-insulating rubber pad according to claim 1, characterized in that: Both the first polydopamine-grafted graphite microsheet (501) and the second polydopamine-grafted graphite microsheet (601) form a micro-tooth array.

3. The graphite-modified closed-cell foamed sound-insulating rubber pad according to claim 2, characterized in that: The tooth height of the first polydopamine-grafted graphite microplate (501) is 5-7 μm, and the tooth height of the second polydopamine-grafted graphite microplate (601) is 7-10 μm.

4. The graphite-modified closed-cell foamed sound-insulating rubber pad according to claim 1, characterized in that: The first pore (201) has a size of 50-100 μm and a closed-cell rate of >95%. The second pore (301) has a size of 150-300 μm and a closed-cell rate of 85-90%. The third pore (401) has a size of 500-800 μm and a closed-cell rate of 75-80%. The nanocomposite damping layer (7) is provided with a fourth pore (701) with a size of 80-150 μm.

5. The graphite-modified closed-cell foamed sound-insulating rubber pad according to claim 4, characterized in that: The thickness of the surface layer (2) is 0.3-0.5 mm, the thickness of the intermediate sound insulation layer (3) is 1.5-2.0 mm, the thickness of the bottom layer (4) is 3.0-4.0 mm, the thickness of the interface reinforcement layer (5) is 0.05-0.1 mm, and the thickness of the nanocomposite damping layer (7) is 0.5-0.8 mm.

6. The graphite-modified closed-cell foamed sound-insulating rubber pad according to claim 5, characterized in that: The through hole (402) is inclined, and the inclination angle of the through hole (402) is 30-45°.

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