Composite rubber pad

Abstract

The utility model discloses a composite rubber pad. The composite rubber pad comprises an outer rubber layer, a sound insulation layer, a damping rubber layer and a hot-melt damping rubber layer which are tightly connected in sequence from top to bottom, wherein the sound insulation layer is a multi-layer composite non-woven fabric. The sound insulation layer is the multi-layer composite non-woven fabric, a textile material has sound absorption and sound insulation performance due to the fact that a large number of pores are formed in the material and still air is retained in the material, and the multi-layer structure formed by laminating the multi-layer non-woven fabric has the sound absorption and sound insulation effect of a low and medium frequency area. And when the composite rubber pad is applied to the vehicle, the overall thickness of the product is not large, and the sound absorption and insulation effects are good.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber pads, in particular to a composite rubber pad. Background Art

[0002] NVH is an important performance indicator of automobiles. In order to effectively reduce the noise inside the car, on the one hand, the noise outside the car can be actively reduced, such as improving parts and strengthening the body strength. On the other hand, damping materials with vibration reduction, sealing, sound absorption or sound insulation can be used to improve the sound insulation and noise reduction performance of the car body. There are three major types of damping materials commonly used in automobiles: asphalt damping materials, rubber damping materials and liquid damping materials.

[0003] At present, most car companies in the market are still using traditional asphalt damping materials, but asphalt damping materials have a high material density and a large amount per car, which is not conducive to the development of lightweight automobiles, and the products and production processes are not environmentally friendly. As new energy vehicles continue to advance in the direction of lightweight and environmentally friendly development, car companies are gradually turning to the use of rubber damping pad materials.

[0004] The Chinese utility model patent with announcement number CN219276914U discloses a rubber sound insulation pad for automobile, including a sound insulation pad body, the sound insulation pad body is a sealing structure, the sound insulation pad body includes a base layer, the material of the base layer is butyl rubber, the inner wall of the base layer is provided with a heat insulation layer, the inner wall of the heat insulation layer is provided with a sound insulation layer, the inner wall of the sound insulation layer is provided with a fixing plate, and a sound insulation cavity is opened inside the fixing plate. By using the base layer as the base of the sound insulation pad body, a sound insulation layer is provided inside the sound insulation pad body, and the material of the sound insulation layer is a pyramid sound-absorbing sponge, because the pyramid sound-absorbing sponge can absorb noise, it can effectively achieve a sound insulation effect.

[0005] Existing rubber pad products use pyramid sound-absorbing sponge as sound insulation material, but the thickness of the pyramid sound-absorbing sponge is often large, otherwise the sound insulation effect is greatly reduced. This results in the overall thickness of the rubber pad product being often large, limiting its application in the automotive field. Utility Model Content

[0006] In order to overcome the above technical defects, the utility model provides a composite rubber pad.

[0007] In order to solve the above problems, the utility model is implemented according to the following technical solutions:

[0008] The composite rubber pad of the utility model comprises an outer rubber layer, a sound insulation layer, a damping rubber layer and a hot-melt damping rubber layer which are tightly connected in sequence from top to bottom;

[0009] Wherein, the sound insulation layer is a multi-layer composite non-woven fabric.

[0010] Preferably, the nonwoven fabric comprises a first nonwoven fabric layer, a second nonwoven fabric layer and a third nonwoven fabric layer;

[0011] The first nonwoven fabric layer and the third nonwoven fabric layer are spunbonded nonwoven fabrics, and the second nonwoven fabric layer is meltblown nonwoven fabric.

[0012] Preferably, the first non-woven fabric layer and the third non-woven fabric layer are both made of trilobal polyester fibers.

[0013] Preferably, a CPE / NBR sound insulation layer with a thickness of 2 mm is further provided between the outer rubber layer and the sound insulation layer.

[0014] Preferably, the outer rubber layer is made of hydrogenated nitrile rubber.

[0015] Preferably, the damping rubber layer is a NBR / CR rubber layer with a thickness of 4 mm.

[0016] Preferably, the hot melt damping adhesive layer is a hot melt asphalt damping sheet with a thickness of 4 mm.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model provides a composite rubber pad, comprising an outer rubber layer, a sound insulation layer, a damping rubber layer and a hot-melt damping adhesive layer which are tightly connected in sequence from top to bottom; wherein the sound insulation layer is a multi-layer composite non-woven fabric.

[0019] The sound insulation layer of the utility model is a multi-layer composite non-woven fabric. The textile material has sound absorption and sound insulation performance because there are a large number of pores in the material and it contains trapped static air. By laminating multiple layers of non-woven fabric, the constructed multi-layer structure has sound absorption and sound insulation effects in the medium and low frequency areas. And it is applied to the composite rubber pad for vehicles. The overall thickness of the product is not large and it has good sound absorption and sound insulation effects.

[0020] On the other hand, the utility model adopts a hot-melt damping adhesive layer, which is used to be placed on the automobile sheet metal plate, hot-melted with the sheet metal plate, and cooled and solidified to achieve a better adhesion effect. Compared with the self-adhesive damping pad, it meets the needs of durable and long-term use. At the same time, the composite structure of multiple layers of rubber is adopted to give the product better strength, large damping, and vibration absorption performance, which can effectively solve the resonance of the car body roof, doors, fenders and other parts at a fixed frequency. The composite structure of multiple layers of rubber materials effectively improves the damping of the product and meets the requirements for high damping of rubber materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the layer structure of a composite rubber pad of the utility model;

[0023] In the figure:

[0024] 10-Outer rubber layer,

[0025] 20-sound insulation layer;

[0026] 30-damping rubber layer;

[0027] 40-hot melt damping adhesive layer;

[0028] 50-CPE / NBR sound insulation layer. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] like Figure 1 As shown, the preferred structure of a composite rubber pad described in the utility model.

[0031] like Figure 1 As shown, the composite rubber pad of the utility model comprises an outer rubber layer 10, a sound insulation layer 20, a damping rubber layer 30 and a hot-melt damping adhesive layer 40 which are tightly connected in sequence from top to bottom; wherein the sound insulation layer 20 is a multi-layer composite non-woven fabric.

[0032] In the main innovation of the utility model, the sound insulation layer is a multi-layer composite non-woven fabric. The textile material has sound absorption and sound insulation performance because there are a large number of pores in the material and it contains trapped static air. By laminating multiple layers of non-woven fabrics, the constructed multi-layer structure has sound absorption and sound insulation effects in the medium and low frequency areas. And it is applied to the composite rubber pad for the car. The overall thickness of the product is not large and has good sound absorption and sound insulation effects.

[0033] Compared with the sponge material in the prior art, this patent achieves better sound insulation effect, and the overall thickness of the rubber pad can be made thinner, which can better meet the use in automobiles.

[0034] On the other hand, the utility model adopts a hot-melt damping adhesive layer, which is used to be placed on the automobile sheet metal plate, hot-melted with the sheet metal plate, and cooled and solidified to achieve a better adhesion effect. Compared with the self-adhesive damping pad, it meets the needs of durable and long-term use. At the same time, the composite structure of multiple layers of rubber is adopted to give the product better strength, large damping, and vibration absorption performance, which can effectively solve the resonance of the car body roof, doors, fenders and other parts at a fixed frequency. The composite structure of multiple layers of rubber materials effectively improves the damping of the product and meets the requirements for high damping of rubber materials.

[0035] In a specific implementation, the nonwoven fabric includes a first nonwoven fabric layer, a second nonwoven fabric layer and a third nonwoven fabric layer; the first nonwoven fabric layer and the third nonwoven fabric layer are spunbonded nonwoven fabrics, and the second nonwoven fabric layer is a meltblown nonwoven fabric.

[0036] The first nonwoven fabric layer and the third nonwoven fabric layer are both made of trilobal polyester fibers, and the second nonwoven fabric layer is made of polyester fibers.

[0037] The sound insulation layer of this patent adopts a sandwich structure. The structural parameters of the surface material and the core material are the key factors affecting the sound absorption performance of the sound absorber. The three-layer nonwoven sound absorption structure is prepared with polyester fiber. The upper and bottom layers are spunbonded nonwovens, and the middle layer is meltblown nonwovens. The sound absorption performance is better than that of a single layer of nonwovens or a composite material of multiple layers of the same nonwovens. The experiment also found that with the increase of the basis weight of the middle layer meltblown fabric, the sound absorption performance is significantly improved.

[0038] In a preferred embodiment, a 2 mm thick CPE / NBR sound insulation layer is further provided between the outer rubber layer and the sound insulation layer. Through this design, the sound insulation layer and the CPE / NBR sound insulation layer coordinate with each other to improve the sound insulation effect. The CPE / NBR sound insulation layer has the characteristics of low density and high sound insulation, and has better comprehensive performance. When used in combination with the sound insulation layer, it is more helpful to increase the sound insulation and shock resistance effect of the sheet metal parts of the car, and has the advantage of good vibration reduction effect.

[0039] In a preferred embodiment, the outer rubber layer is made of hydrogenated nitrile rubber. The outer rubber layer adopts hydrogenated nitrile rubber, which has good oil resistance, heat resistance, chemical corrosion resistance, ozone resistance, and compression permanent deformation resistance; at the same time, hydrogenated nitrile rubber also has the characteristics of high strength, high tear resistance, and excellent wear resistance. On the one hand, the hydrogenated nitrile rubber layer serves as a protective layer of the rubber shock-absorbing pad to increase the service life, and on the other hand, it serves as a reinforcing material to improve the material properties of the sheet metal plate and provide protection.

[0040] In a specific implementation, the thickness of the outer rubber layer is 4 mm. The outer rubber layer can be composited with other layer structures into a whole by an adhesive, or by a hot melt material, such as PA hot melt adhesive, EVA hot melt adhesive or LDPE hot melt adhesive.

[0041] In a preferred implementation, the damping rubber layer is a NBR / CR rubber layer with a thickness of 4 mm.

[0042] In a preferred embodiment, the hot-melt damping adhesive layer is a hot-melt asphalt damping sheet with a thickness of 4 mm. The utility model adopts a hot-melt damping adhesive layer, which is used to be placed on the automobile sheet metal plate, hot-melted with the sheet metal plate, and cooled and solidified to achieve a better adhesion effect. Compared with the self-adhesive damping pad, it meets the requirements of durable use and long-term use.

[0043] For other structures of the composite rubber pad described in this embodiment, refer to the prior art.

[0044] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A composite rubber pad, characterized in that: It includes an outer rubber layer, a sound insulation layer, a damping rubber layer and a hot-melt damping adhesive layer which are tightly connected in sequence from top to bottom; Wherein, the sound insulation layer is a multi-layer composite non-woven fabric.

2. A composite rubber pad according to claim 1, characterized in that: The nonwoven fabric comprises a first nonwoven fabric layer, a second nonwoven fabric layer and a third nonwoven fabric layer; The first nonwoven fabric layer and the third nonwoven fabric layer are spunbonded nonwoven fabrics, and the second nonwoven fabric layer is meltblown nonwoven fabric.

3. A composite rubber pad according to claim 2, characterized in that: The first non-woven fabric layer and the third non-woven fabric layer are both made of trilobal polyester fibers.

4. The composite rubber pad according to claim 1, characterized in that: A CPE / NBR sound insulation layer with a thickness of 2 mm is also arranged between the outer rubber layer and the sound insulation layer.

5. The composite rubber pad according to claim 1, characterized in that: The outer rubber layer is made of hydrogenated nitrile rubber.

6. The composite rubber pad according to claim 1, characterized in that: The damping rubber layer is a NBR / CR rubber layer with a thickness of 4 mm.

7. The composite rubber pad according to claim 1, characterized in that: The hot melt damping adhesive layer is a hot melt asphalt damping sheet with a thickness of 4 mm.

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