Layered sound absorbing material and preparation method thereof

Abstract

The invention discloses a layered sound absorbing material and a preparation method thereof. The sound absorbing material comprises a hot air cotton layer and a heat-resistant fiber composite layer; the vibration frequency of the heat-resistant fiber composite layer is 500-6000Hz, and the heat-resistant fiber composite layer is a non-woven material layer composed of heat-resistant fiber whose continuous usage temperature is 160-240 DEG C; and at least one surface of the upper surface and the lower surface of the hot air cotton is attached with the heat-resistant fiber composite material. The layered sound absorbing material can be used for keeping absorption of high-frequency noise and improving absorption of low-frequency noise, and has the characteristic of simple production technology.

Description

technical field [0001] The invention relates to a layered sound-absorbing material and a preparation method thereof. Background technique [0002] With the continuous development of modern industry and the continuous improvement of people's living standards, the quality requirements for the environment are also getting higher and higher. Today, noise pollution has become one of the three major pollution problems in the world today. Noise pollution will affect people's interference with conversation, thinking, sleep and rest. In addition, noise pollution will also accelerate the aging of buildings and mechanical structures. , affecting the accuracy and service life of equipment and instruments. Therefore, it is necessary to use sound-absorbing materials to absorb the noise in the air. [0003] According to the classification of its own structure, sound-absorbing materials can be divided into two types: porous sound-absorbing materials and resonant sound-absorbing materials....

AI Technical Summary

Problems solved by technology

[0004] For example, the Chinese published patent CN202422724 discloses a full-frequency sound-absorbing cotton. The sound-absorbing cotton has a two-layer or three-layer structure. The full-frequency sound-absorbing cotton with a two-layer structure is composed of a melt-blown polymer fiber and an expanded polytetrafluoroethylene layer; The full-frequency sound-absorbing cotton with a three-layer structure is composed of a melt-blown high polymer fiber layer and a double-sided composite expanded polytetrafluoroethylene layer. This sound-absorbing material has defects such as complex manufacturing process, low temperature resistance, and poor low-frequency sound absorption performance.

[0005] Another example is that Chinese published patent CN101189381 discloses a layered sound-absorbing non-woven fabric comprising a resonant film and at least another layer of fiber material. Although this invention solves the problem of not being able to absorb lower frequency sounds, the material is in the fiber layer The surface of the surface is made by electrostatic spin-coating a layer of nano-scale fibers. At present, the electrospinning process is in the laboratory stage, and large-scale industrial production has not been realized, which is also not conducive to enterprise production.

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