Preparation method of nano-fiber-foam-based acoustic material

Abstract

The invention provides a preparation method of a nano-fiber-foam-based acoustic material. The preparation method is characterized by concretely including the steps that step1, activating treatment is performed on the surfaces of nano-fiber foams; step2, at the temperature of 32 DEG C-35 DEG C, under the pressure intensity of 7.39*106 Pa-8.0*106 Pa, a mixture of supercritical carbon dioxide fluid, adhesive and surface roughness modified particles treats the nano-fiber foams obtained in the previous step, then the pressure intensity is lowered, in this way, the nano-fiber foams are desorbed from the supercritical carbon dioxide fluid, and the adhesive and the surface roughness modified particles are evenly dispersed on the surfaces of fibers; step3, a thermo-crosslink method is adopted for solidifying and crosslinking the adhesive and combining the surface roughness modified particles on the surfaces of the fibers, so that the nano-fiber-foam-based acoustic material is obtained. The nano-fiber-foam-based acoustic material is better in acoustic 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.