A kind of preparation method of nanofiber foam-based sound-absorbing material

Abstract

The invention provides a method for preparing a nanofiber foam-based sound-absorbing material, which is characterized in that the specific steps include: the first step: activate the surface of the nanofiber foam; the second step: at a temperature of 32°C to 35°C, Under the condition of a pressure of 7.39×106Pa~8.0×106Pa, the nanofiber foam obtained in the previous step is treated with a mixture of supercritical carbon dioxide fluid, adhesive agent and surface roughness modified particles, and then the pressure is reduced to make the nanofiber foam Desorb the supercritical carbon dioxide fluid, so that the adhesive and surface roughness modified particles are evenly dispersed on the surface of the fiber; the third step: the adhesive is cured and crosslinked by thermal cross-linking, so that the surface roughness modified particles are combined on the fiber surface , to obtain nanofiber foam-based sound-absorbing materials. The invention has better sound absorption performance.

Description

technical field [0001] The invention belongs to the technical field of noise pollution control, and in particular relates to a nanofiber foam-based sound-absorbing material and a preparation method thereof. Background technique [0002] Noise pollution has caused great harm to people's physical and mental health. Effectively preventing noise pollution and reducing the harm of noise are necessary measures to ensure people's normal work and life. Sound-absorbing materials can control noise pollution from three aspects: the source of noise generation, the process of transmission, and the protection of terminal victims. It is the most effective means of applying noise pollution. Sound-absorbing materials can be divided into porous sound-absorbing materials, resonant sound-absorbing materials and special-structure sound-absorbing materials according to their sound-absorbing characteristics. Among them, porous sound-absorbing materials have the characteristics of light weight and ...

AI Technical Summary

Problems solved by technology

The materials and products provided by the above patents have large internal pore diameters and narrow pore size distribution, which cannot effectively absorb low-frequency noise, and the bulk density of materials is generally too large

Aiming at the problem of high volume density of sound-absorbing materials, the domestic patent CN101807394Y discloses a layered sound-absorbing material composed of micro-nano fibers. Superimposed and combined with each other, the sound absorption and flame retardancy of the overall material can be adjusted by adjusting the micro-nano fiber components, thickness, bulk density and functional fillers of different layers of materials, although the patent introduces nanofibers as a lightweight component of the material. However, the bulk density of the material is still relatively large, and the internal fillers, including powdered fillers, only act as a single filling modification, and cannot be tightly bonded to the fiber surface to improve the pore structure of the material. Therefore, the sound-absorbing performance of the material Especially low frequency sound absorption performance is poor

To sum up, the above-mentioned patents and products all have the disadvantages of poor sound-absorbing performance, especially low-frequency sound-absorbing performance, and excessive bulk density, which severely limits the extensive application of sound-absorbing materials in aerospace, high-end automobiles and other fields.