Lightweight sound-absorbing cotton composite material with strong sound insulation and noise reduction functions

Abstract

The utility model discloses a lightweight sound-absorbing cotton composite material with strong sound insulation and noise reduction, which is characterized in that sound-absorbing cotton and a plastic film or a rubber and plastic damping film are bonded through glue and then are subjected to rolling bonding, then are fed into a drying tunnel to be dried and cured, and finally are rolled to obtain the sound-absorbing cotton composite material, and the sound-absorbing cotton composite material is used for sealing a cabin or automotive upholstery. By means of the mode, the sound absorption and noise reduction effects are achieved, the strong sound insulation effect of noise reflection and damping vibration attenuation and noise reduction is achieved, the advantages of being low in density, low in cost and easy to manufacture are achieved, and the noise reduction effect is better when the sound absorption and noise reduction composite material is used in a closed cabin or an automobile interior.

Description

TECHNICAL FIELD

[0001] The utility model relates to sound absorbing material field especially is related to a light weight strong sound insulation noise reduction sound absorbing cotton composite material. BACKGROUND

[0002] Acoustic materials can be divided into sound absorbing materials and sound insulation materials according to their different use functions.Sound absorption mainly solves the noisy feeling caused by sound reflection, and sound absorbing materials can attenuate the reflection energy of incident sound sources, thereby achieving the fidelity effect of the original sound source.Sound insulation mainly solves the noisy feeling of the main body in space caused by sound transmission, and sound insulation materials can attenuate the transmission energy of incident sound sources, thereby achieving the quiet state of the main body space.

[0003] Sound absorbing cotton belongs to porous sound absorbing material, and the sound absorbing mechanism is that there are a large number of small interconnected pores in the material, and sound waves can penetrate into the material along these pores and rub with the material to convert sound energy into heat energy.The sound absorption characteristics of porous sound absorbing material gradually increase with the increase of frequency, which means that low-frequency absorption is not as good as high-frequency absorption.The necessary condition for porous material sound absorption is that the material has a large number of voids, and the voids are interconnected.

[0004] Sound absorbing cotton can consume sound energy during sound wave propagation to achieve the purpose of reducing noise.Sound waves have mechanical energy, and when sound waves are incident on the surface of sound absorbing cotton, part of the sound energy is reflected by sound absorbing cotton; a part will enter the pores of sound absorbing cotton, and when it hits air and fine fibers, it will vibrate, and under the action of friction and viscous force, sound energy will eventually be converted into heat energy; another part will penetrate the sound absorbing cotton.

[0005] The main factors affecting the sound absorbing performance of sound absorbing cotton are thickness, density and air flow resistance, etc.Density is the weight of the material per cubic meter.Air flow resistance is the ratio of air pressure and air flow rate on both sides of the material per unit thickness.Air flow resistance is the most important factor affecting the sound absorbing performance of sound absorbing cotton.If the flow resistance is too small, it means that the material is sparse, and air vibration is easy to pass through, so the sound absorbing performance is reduced; if the flow resistance is too large, it means that the material is dense, and air vibration is difficult to transmit, so the sound absorbing performance is also reduced.For sound absorbing cotton, there is an optimal flow resistance.

[0006] The two common sound absorbing cottons on the market are glass fiber sound absorbing cotton and polyester fiber sound absorbing cotton.Sound absorbing cotton can consume sound energy during sound wave propagation to achieve the purpose of reducing noise, but most sound absorbing cottons have low sound absorption coefficient, resulting in poor noise reduction effect, and it is difficult to meet the technical index requirements of some car enterprises. INVENTION CONTENTS

[0007] The utility model mainly solves the technical problem of providing a kind of lightweight strong sound insulation noise reduction sound-absorbing cotton composite material, with the effect of sound absorption and noise reduction, also with the strong sound insulation effect of noise reflection, damping vibration reduction and noise reduction, with the advantages of light weight, low cost and easy to manufacture, and the noise reduction effect is better in closed cabin or car interior.

[0008] To solve the above technical problems, the utility model adopts one technical scheme: provide a kind of lightweight strong sound insulation noise reduction sound-absorbing cotton composite material, including two layers of sound-absorbing cotton, two layers of the sound-absorbing cotton are connected to form integral composite material by plastic film layer or rubber plastic damping film layer, and the plastic film layer or rubber plastic damping film layer reflects sound back into the sound-absorbing cotton.

[0009] In a preferred embodiment of the utility model, the two sides of the plastic film layer or rubber plastic damping film layer are bonded into an integral composite material with the sound-absorbing cotton by glue.

[0010] In a preferred embodiment of the utility model, the plastic film layer is a PE film or a PET film or a nylon film.

[0011] In a preferred embodiment of the utility model, the rubber plastic damping film layer is a butyl rubber film or an EPDM ternary ethylene-propylene rubber film or a silicone rubber film.

[0012] The utility model has the advantages that the utility model light weight strong sound insulation noise reduction sound-absorbing cotton composite material effectively absorbs noise by sound-absorbing cotton, and the internal plastic film layer or rubber plastic damping film layer can reflect the incoming noise back into the sound-absorbing cotton, further improving the effect of noise reduction and sound absorption.

[0013] The utility model light weight strong sound insulation noise reduction sound-absorbing cotton composite material combines sound-absorbing cotton and plastic film layer or rubber plastic damping film layer, and the overall material is lightweight, low in cost and easy to prepare.

[0014] The utility model light weight strong sound insulation noise reduction sound-absorbing cotton composite material is used in closed cabin or car interior to improve the noise reduction and sound insulation effect by 3-5 times, providing a quiet and comfortable environment for people working in closed cabin or car, which is beneficial to the physical and mental health of the internal personnel and improves work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor, wherein:

[0016] Figure 1It is a structure schematic view of a preferable embodiment of the sound-absorbing cotton composite material of the light weight, strong sound insulation and noise reduction of the utility model;

[0017] Figure 2 It is a structure schematic view of another preferable embodiment of the sound-absorbing cotton composite material of the light weight, strong sound insulation and noise reduction of the utility model;

[0018] The marks of components in the drawing are as follows: 1, sound-absorbing cotton, 2, plastic film layer, 3, rubber plastic damping film layer. Specific implementation

[0019] The technical scheme in the embodiments of the utility model will be described clearly and completely below. The structure, proportion, size and the like shown in the drawings of the specification are merely used to cooperate with the content disclosed in the specification to enable those skilled in the art to understand and read, and are not used to limit the limiting conditions of the embodiments of the utility model, so they do not have the substantial meaning in the technology, any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be produced by the utility model, should still fall within the range covered by the technical content disclosed by the utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in the specification are merely for the convenience of clear understanding of the description, and are not used to limit the range of the embodiments, the change or adjustment of the relative relationship, without substantially changing the technical content, is also regarded as the scope of the embodiments of the utility model.

[0020] Please refer to Figure 1 and Figure 2 A sound-absorbing cotton composite material of the light weight, strong sound insulation and noise reduction, comprising two layers of sound-absorbing cotton 1, the two layers of sound-absorbing cotton 1 are connected to form an overall composite material through a plastic film layer 2 or a rubber plastic damping film layer 3, and the plastic film layer 2 or the rubber plastic damping film layer 3 reflects sound back into the sound-absorbing cotton 1. The two sides of the plastic film layer 2 or the rubber plastic damping film layer 3 are bonded to the sound-absorbing cotton 1 by glue to form an overall composite material.

[0021] The plastic film layer 2 is a PE film or a PET film or a nylon film or the like.

[0022] The rubber plastic damping film layer 3 is a butyl rubber film or an EPDM ternary ethylene-propylene rubber film or a silicone film or the like.

[0023] Through the combination of the sound-absorbing cotton 1 and the plastic film layer 2 or the rubber plastic damping film layer 3, the overall composite material can be lightened, novel in structure, easy to mass-produce, low in cost, and conducive to large-scale popularization and application in the automobile or other industries.

[0024] Table 1 is the sound absorption coefficient of the sound-absorbing cotton of a foreign company and the sound absorption coefficient index requirement of Shanghai General Motors:

[0025]

[0026] Table 2 is the sound absorption coefficient of the sound absorption cotton of a domestic company:

[0027]

[0028] Table 3 is the sound absorption coefficient of the sound absorption cotton of the utility model and its sound insulation amount ratio table detected by the standing wave tube method

[0029]

[0030] A layer of plastic film layer 2 or rubber damping layer is laid in the two layers of sound absorption cotton 1, noise first enters the sound absorption cotton 1 and is absorbed in part, then the noise that is not absorbed collides with the plastic film or rubber damping layer and is reflected, and then enters the sound absorption cotton 1 again, so that the noise is absorbed twice, the sound absorption coefficient can be effectively improved, and the strong sound insulation effect of noise reflection, damping vibration reduction and noise reduction is achieved.

[0031] A preparation method of a light-weight strong sound insulation and noise reduction sound absorption cotton composite material, comprising the following steps: S1. unwinding a plastic film or rubber damping film, and then coating glue on the upper and lower surfaces of the plastic film or rubber damping film; S2. unwinding the sound absorption cotton, and bonding the sound absorption cotton and the plastic film or rubber damping film into an integrated body; S3. bonding the bonded sound absorption cotton and plastic film or rubber damping film through rolling, and then feeding into a drying channel for drying and curing, the drying temperature is 60-90 DEG C, the curing time is 1h, and finally the sound absorption cotton composite material is obtained through winding.

[0032] An automotive interior part, the interior part is provided with the sound absorption cotton composite material. A closed cabin, the cabin is provided with the sound absorption cotton composite material. The sound absorption cotton composite material is used in the closed cabin or the automotive interior, and the noise reduction effect is more obvious (the sound insulation effect is improved by 3-5 times), a quiet working comfortable environment is provided for people in the closed cabin or the automotive interior, the physical and mental health of the internal personnel is improved, and the working efficiency is improved.

[0033] Different from the prior art, the utility model has the effects of sound absorption and noise reduction, has the strong sound insulation effect of noise reflection, damping vibration reduction and noise reduction, has the advantages of light weight, low cost and easy manufacturing, and has better noise reduction effect when used in the closed cabin or the automotive interior.

[0034] The utility model and its implementation modes are described above, the description is not restrictive, and the embodiment shown in the drawings is only one of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A light-weight sound-absorbing cotton composite material with strong sound insulation and noise reduction, characterized in that, The sound-absorbing cotton is connected by a plastic film layer or a rubber damping film layer to form a whole composite material, and the plastic film layer or the rubber damping film layer reflects the sound back into the sound-absorbing cotton.

2. The light-weight sound insulation and noise reduction sound-absorbing cotton composite material according to claim 1, characterized in that, The plastic film layer or the rubber damping film layer is bonded to the sound-absorbing cotton by glue to form a whole composite material. 3.The light-weight sound insulation and noise reduction sound-absorbing cotton composite material of claim 1, characterized in that, The plastic film layer is a PE film or a PET film or a nylon film.

4. The light-weight sound insulation and noise reduction sound-absorbing cotton composite material according to claim 1, characterized in that, The rubber damping film layer is a butyl rubber film or an EPDM ternary ethylene-propylene rubber film or a silica gel film.

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