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Light medium- and low-frequency sound absorption material and preparation method thereof

A sound-absorbing material and low-frequency technology, applied in coatings, non-woven fabrics, electrospinning, etc., can solve the problems of poor low-frequency sound-absorbing effect, achieve low environmental pollution, easy preparation, and improve mid-low frequency sound-absorbing performance Effect

Inactive Publication Date: 2020-08-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional sound-absorbing materials such as sound-absorbing foam, fiber material, perforated board, etc. have good high-frequency sound-absorbing performance, but low-frequency sound-absorbing effect is poor

Method used

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  • Light medium- and low-frequency sound absorption material and preparation method thereof
  • Light medium- and low-frequency sound absorption material and preparation method thereof
  • Light medium- and low-frequency sound absorption material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A lightweight medium-low frequency sound-absorbing material and its preparation method:

[0029] Step (1): prepare polyacrylonitrile spinning solution, polyacrylonitrile is added in N,N-dimethylformamide, wherein, the concentration of polyacrylonitrile is respectively 6wt% (such as N,N-dimethylformamide If the amide is 4.7g, then add polyacrylonitrile (0.3g), stir magnetically for 20-24h, and obtain a uniform solution;

[0030] Step (2): Electrospinning is performed on the base of the nonwoven fabric: the applied voltage is 10 kV, the spinning speed is 1 mL / h, and the spinning distance is 12 cm.

[0031] Step (3): dry treatment at room temperature to obtain a nanofiber composite nonwoven fabric sound-absorbing material; the sound absorption coefficient is as follows figure 2 (100-2500Hz), image 3 (100-500Hz) shown.

Embodiment 2

[0033] A lightweight medium-low frequency sound-absorbing material and its preparation method:

[0034] Step (1): prepare polyacrylonitrile spinning solution, polyacrylonitrile is added in N,N-dimethylformamide, wherein, the concentration of polyacrylonitrile is respectively 8wt% (such as N,N-dimethylformamide If the amide is 4.6g, then add polyacrylonitrile (0.4g), stir magnetically for 20-24h, and obtain a uniform solution;

[0035] Step (2): Electrospinning is performed on the base of the nonwoven fabric: the applied voltage is 10 kV, the spinning speed is 1 mL / h, and the spinning distance is 12 cm.

[0036] Step (3): dry treatment at room temperature to obtain a nanofiber composite nonwoven fabric sound-absorbing material; the sound absorption coefficient is as follows figure 2 (100-2500Hz), image 3 (100-500Hz) shown.

Embodiment 3

[0038] A lightweight medium-low frequency sound-absorbing material and its preparation method:

[0039] Step (1): prepare polyacrylonitrile spinning solution, polyacrylonitrile is added in N,N-dimethylformamide, wherein, the concentration of polyacrylonitrile is respectively 10wt% (such as N,N-dimethylformamide If the amide is 4.5g, then add polyacrylonitrile (0.5g), stir magnetically for 20-24h, and obtain a uniform solution;

[0040] Step (2): Electrospinning is performed on the base of the nonwoven fabric: the applied voltage is 10 kV, the spinning speed is 1 mL / h, and the spinning distance is 12 cm.

[0041] Step (3): dry treatment at room temperature to obtain a nanofiber composite nonwoven fabric sound-absorbing material; the sound absorption coefficient is as follows figure 2 (100-2500Hz), image 3 (100-500Hz) shown.

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Abstract

The invention discloses a light medium- and low-frequency sound absorption material and a preparation method thereof. The material comprises meltblown non-woven fabric which is used as a substrate, and further comprises a polyacrylonitrile nanofiber membrane or a polyacrylonitrile / titanium dioxide nanofiber membrane which covers the substrate. According to the preparation method, the static spinning technology is adopted and the polyacrylonitrile nanofiber membrane or the polyacrylonitrile / titanium dioxide nanofiber membrane is prepared on the meltblown non-woven fabric substrate. The materialhas relatively good medium- and low-frequency sound absorption performance, the preparation operation method is simple, one-step lamination is realized and post-treatment processing or other lamination processes are omitted.

Description

technical field [0001] The invention belongs to the field of sound-absorbing materials and their preparation, and in particular relates to a lightweight mid-low frequency sound-absorbing material and a preparation method thereof. Background technique [0002] Traditional sound-absorbing materials such as sound-absorbing foam, fiber materials, perforated panels, etc. have good high-frequency sound absorption performance, but poor low-frequency sound absorption. However, middle and low frequency noises are more potentially harmful to human health. Therefore, the development of low frequency sound-absorbing structures and sound-absorbing materials is particularly important. In recent years, due to the advantages of low diameter, high specific surface area, large porosity, softness and light weight, and high porosity, the application of nanofibers has gradually expanded to the field of acoustics. The multilayer structure of micro / nanofiber membrane composite textile materials ha...

Claims

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Application Information

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IPC IPC(8): D01D5/00D04H1/43D04H3/007D04H1/728D04H3/02
CPCD01D5/003D01D5/0084D04H1/43D04H1/728D04H3/007D04H3/02
Inventor 晏雄沈佳慧张斌李晓才
Owner DONGHUA UNIV
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