Composite automobile sound absorbing cotton

Abstract

The utility model discloses a kind of composite automobile sound-absorbing cotton, comprising: main body mechanism, main body mechanism includes bottom rubber layer, the heat preservation layer of bonding in the top end of bottom rubber layer, the fiber sound-absorbing layer of bonding in the top end of heat preservation layer, the polyurethane foaming layer of bonding in the top end of fiber sound-absorbing layer, the non-woven fabric of bonding in the top end of polyurethane foaming layer, bonding in the top end of non-woven fabric Flame-retardant layer and bonding in the top end of Flame-retardant layer top rubber layer, bottom rubber layer can play protective effect to other functional layer, and water vapor can be avoided to enter into fiber sound-absorbing layer and polyurethane foaming layer, avoid both because of dampness cause mildew, heat preservation layer can play heat preservation effect, subsequent is 3MM, can effectively avoid the heat in vehicle radiate, the composite automobile sound-absorbing cotton, with the advantages that sound-absorbing effect is high and flame-retardant performance is high.

Description

Technical Field

[0001] This utility model relates to the field of sound-absorbing cotton technology, specifically a composite automotive sound-absorbing cotton. Background Technology

[0002] Sound-absorbing cotton can convert the vibration energy of medium and high frequency noise generated in daily life into the kinetic energy of the fine denier fibers inside the cotton and then convert it into heat energy, thus achieving the function of sound absorption and noise reduction. In automobile manufacturing, sound-absorbing cotton is widely used to effectively improve the sound insulation performance of automobiles.

[0003] The existing automotive sound-absorbing cotton has the following drawbacks during use: poor sound absorption effect; it is acceptable for absorbing mid-to-high frequency noise, but poor for absorbing low-frequency noise generated by the car's own vibration. In addition, the existing sound-absorbing cotton has poor flame retardancy; once it burns, the flame will spread rapidly. Therefore, there is room for improvement. Utility Model Content

[0004] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the technical solution adopted by this utility model is as follows: a composite automotive sound-absorbing cotton, comprising: a main body, the main body comprising a bottom rubber layer, a heat insulation layer bonded to the top of the bottom rubber layer, a fiber sound-absorbing layer bonded to the top of the heat insulation layer, a polyurethane foam layer bonded to the top of the fiber sound-absorbing layer, a non-woven fabric bonded to the top of the polyurethane foam layer, a flame-retardant layer bonded to the top of the non-woven fabric, and a top rubber layer bonded to the top of the flame-retardant layer.

[0006] The bottom surface of the flame-retardant layer has crisscrossing grooves, and the grooves are filled with phosphorus-containing flame-retardant particles.

[0007] In a preferred embodiment, the present invention can be further configured such that the top of the top rubber layer is provided with an array of semi-circular protrusions.

[0008] In a preferred embodiment, the present invention can be further configured such that the thickness of the fiber sound-absorbing layer is 5-10 mm.

[0009] In a preferred embodiment, the present invention can be further configured such that the thickness of the polyurethane foam layer is 5-10 mm.

[0010] In a preferred embodiment, the present invention can be further configured such that the insulation layer has a thickness of 3 mm.

[0011] By adopting the above technical solution, the beneficial effects achieved by this utility model are as follows: 1. In this utility model, an insulation layer is bonded to the top of the bottom rubber layer, and a fiber sound-absorbing layer and a polyurethane foam layer are bonded to the top of the insulation layer. This effectively absorbs mid-to-high frequency noise. Simultaneously, a non-woven fabric is bonded to the top of the polyurethane foam layer, and a top rubber layer is bonded to the top of the non-woven fabric. The top surface of the top rubber layer has multiple semi-circular protrusions arranged in an array. During installation, the semi-circular protrusions are pressed tightly against the inner wall of the car. At this time, the vibration of the vehicle itself can be buffered by the semi-circular protrusions and the top rubber layer, reducing low-frequency noise generated by vehicle vibration, thereby effectively improving the sound absorption and insulation performance of the sound-absorbing cotton and further increasing its practicality. In addition, the bottom and top rubber layers effectively prevent moisture from entering, thus preventing the sound-absorbing cotton from becoming damp and moldy.

[0012] 2. In this utility model, a flame-retardant layer is set between the top rubber layer and the non-woven fabric, which can effectively improve the flame-retardant performance of the sound-absorbing cotton. At the bottom of the flame-retardant layer, there are grooves in a crisscross pattern. The grooves are filled with phosphorus-containing flame-retardant particles. The metaphosphoric acid generated during the combustion of the phosphorus-containing flame-retardant particles polymerizes and covers the surface of the sound-absorbing cotton, which can isolate oxygen and combustibles, thereby achieving a flame-retardant effect. This achieves the purpose of increasing the flame-retardant performance of the sound-absorbing cotton and improving its practicality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is an exploded structural diagram of the present invention; Figure 4 This is a schematic diagram of the flame-retardant layer structure of this utility model.

[0014] Figure label: 100. Main structure; 110. Bottom rubber layer; 120. Thermal insulation layer; 130. Fiber sound-absorbing layer; 140. Polyurethane foam layer; 150. Non-woven fabric; 160. Flame retardant layer; 161. Groove; 170. Top rubber layer; 171. Semi-circular protrusion. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0016] Some embodiments of this utility model are described below with reference to the accompanying drawings. Example 1: Combination Figure 1-4As shown, this embodiment provides a composite automotive sound-absorbing cotton, including: a main body 100.

[0017] The main body 100 includes a bottom rubber layer 110, an insulation layer 120 bonded to the top of the bottom rubber layer 110, a fiber sound-absorbing layer 130 bonded to the top of the insulation layer 120, a polyurethane foam layer 140 bonded to the top of the fiber sound-absorbing layer 130, a non-woven fabric 150 bonded to the top of the polyurethane foam layer 140, a flame-retardant layer 160 bonded to the top of the non-woven fabric 150, and a top rubber layer 170 bonded to the top of the flame-retardant layer 160.

[0018] The bottom rubber layer 110 can protect other functional layers and prevent moisture from entering the fiber sound-absorbing layer 130 and the polyurethane foam layer 140, thus preventing them from becoming moldy due to moisture.

[0019] The 120mm insulation layer provides insulation, while the subsequent 3mm layer effectively prevents heat from escaping from the vehicle.

[0020] Both the fiber sound insulation layer and the polyurethane foam layer 140 have porous internal structures, but the difference lies in their density. This allows them to absorb noise in different frequency bands. The working principle is that the porous structure and friction convert sound wave energy into heat energy, thereby reducing sound reflection and propagation, thus achieving sound absorption. The thickness of the fiber sound absorption layer 130 is 5-10 mm, and the thickness of the polyurethane foam layer 140 is 5-10 mm. These thicknesses can be adjusted according to requirements in actual production to make it suitable for different vehicles.

[0021] Non-woven fabric 150 is used to facilitate the connection of flame-retardant layer 160 and polyurethane foam layer 140 together. Flame-retardant layer 160 is a halogen-free flame-retardant PE film, used to provide flame retardancy and prevent further combustion of the flame. The bottom surface of flame-retardant layer 160 has crisscrossing grooves 161, which are filled with phosphorus-containing flame-retardant particles to achieve the flame-retardant effect. The mechanism is as follows: first step: When phosphorus-containing flame-retardant particles burn, they form phosphoric acid, which acts as a dehydrating agent and promotes char formation. The formation of char reduces the heat transfer from the flame to the condensed phase.

[0022] Step Two: Phosphoric acid is endothermic because it prevents CO from being oxidized to CO2, thus reducing the heating process.

[0023] Step 3: A thin, glassy or liquid protective layer is formed on the condensed phase, thus reducing oxygen diffusion and heat and mass transfer between the gas and solid phases, inhibiting the carbon oxidation process, and reducing the thermal decomposition of phosphorus-containing flame retardant particles. The following changes occur: phosphorus-based flame retardant → metaphosphate → phosphoric acid → polymetaphosphate. Polymetaphosphate is a stable compound that is not easily volatile and has strong dehydrating properties. It isolates the polymer surface from the air; the released water vapor absorbs a large amount of heat, causing the flame retardant on the polymer surface to decompose and release volatile phosphides, which greatly reduces the hydrogen atom concentration, indicating that PO- captures H-, i.e., PO + H- = HPO.

[0024] The top rubber layer 170 is used to adhere to the inner wall of the vehicle. Semi-circular protrusions 171 are arranged in an array at the top of the top rubber layer 170 to buffer the vibration of the vehicle itself and avoid low-frequency noise caused by vibration.

[0025] The working principle and usage process of this utility model are as follows: When in use, the sound-absorbing cotton is installed on the vehicle, so that the semi-circular protrusion 171 on the top rubber layer 170 is tightly attached to the inner wall of the vehicle. During the vehicle's operation, the semi-circular protrusion 171 and the top rubber layer 170 can buffer the vehicle's own vibration and avoid low-frequency noise caused by vibration. In addition, the non-woven fabric layer 150, the polyurethane foam layer 140, and the fiber sound-absorbing layer 130 can absorb mid-to-high frequency noise. When the vehicle catches fire, the flame-retardant layer 160 first prevents the flame from spreading further through the sound-absorbing cotton. The flame burns through the flame-retardant layer 160, releasing the phosphorus-containing flame-retardant particles in the sealed space. The metaphosphoric acid generated during the combustion of the phosphorus-containing flame-retardant particles polymerizes and covers the surface of the sound-absorbing cotton, which plays a role in isolating oxygen and combustibles, thereby achieving a flame-retardant effect.

[0026] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite automotive sound-absorbing cotton, comprising: The main body (100) is characterized in that the main body (100) includes a bottom rubber layer (110), a heat insulation layer (120) bonded to the top of the bottom rubber layer (110), a fiber sound-absorbing layer (130) bonded to the top of the heat insulation layer (120), a polyurethane foam layer (140) bonded to the top of the fiber sound-absorbing layer (130), a non-woven fabric (150) bonded to the top of the polyurethane foam layer (140), a flame-retardant layer (160) bonded to the top of the non-woven fabric (150), and a top rubber layer (170) bonded to the top of the flame-retardant layer (160). The bottom surface of the flame retardant layer (160) has crisscrossing grooves (161), and the grooves (161) are filled with phosphorus-containing flame retardant particles.

2. The composite automotive sound-absorbing cotton according to claim 1, characterized in that, The top of the top rubber layer (170) is provided with an array of semi-circular protrusions (171).

3. The composite automotive sound-absorbing cotton according to claim 1, characterized in that, The thickness of the fiber sound-absorbing layer (130) is 5-10 mm.

4. The composite automotive sound-absorbing cotton according to claim 1, characterized in that, The thickness of the polyurethane foam layer (140) is 5-10 mm.

5. The composite automotive sound-absorbing cotton according to claim 1, characterized in that, The insulation layer (120) has a thickness of 3 mm.

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