Sound absorption black body foam material and preparation method thereof

Abstract

The invention provides a multi-stage foam sound absorption black body material for the first time, graphene aerogel is introduced into a commercialized polymer foam skeleton by using a solvent plasticizing foaming technology, so that ultrathin graphene drums are embedded into the foam skeleton, and when sound waves enter the foam black body, a large number of graphene drums generate a violent resonance effect, so that attenuation of the sound waves is rapidly achieved, and in combination with friction loss of a porous structure of the polymer foam to the sound waves, the sound absorption black body foam material has excellent sound absorption performance in a broadband range. The scheme is based on a commercial foam material, the method is simple, the cost is low, and the potential of wide industrial application is achieved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a sound-absorbing black body foam material and a preparation method thereof. Background technique [0002] Sound-absorbing materials have a wide range of applications, and play an indispensable role in various fields from personal protection, electrical protection to architectural design. At present, about 1 / 5 people in the world are suffering from hearing loss, and this number is constantly increasing rapidly. Therefore, it is particularly important to explore high-performance acoustic absorbing materials. As a traditional sound-absorbing material, polymer foam has been widely used in various fields due to its highly porous structure. The basic principle of its sound-absorbing performance mainly relies on the friction of sound waves in the porous cavity to generate loss. At present, there have been many studies on the pore size and pore structure of po...

AI Technical Summary

Problems solved by technology

However, there are still two major problems with graphene drums as acoustic absorbing materials.

First of all, it is difficult to assemble ultra-thin graphene drums into macroscopic materials for daily use; although aerogels can assemble nanometer-thick graphene in three-dimensional porous materials, due to the weak bonding between sheets , not fixed to form a nano-graphene drum structure, so it is easy to produce sheet slip during vibration, which affects its sound absorption ability; and due to the high cost of graphene, it is still more expensive to use graphene alone for large-scale applications. insufficient

Secondly, inside the polymer foam where graphene sheets are directly fixed, graphene tends to pile up layers, which seriously loses the ultra-thin vibration characteristics of graphene.

Therefore, there are still huge challenges in how to prepare new high-performance sound-absorbing materials.

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