Sound-absorbing piece and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11437007-B2
Application number	US-201616073632-A
Country	US
Kind code	B2
Filing date	May 18, 2016
Priority date	Jan 28, 2016
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

The present invention discloses a sound-absorbing piece and a preparation method thereof. The preparation method of the sound-absorbing piece comprises: preparing perforated sound-absorbing cotton matched with a preset cavity in shape; mixing sound-absorbing material powder with a solvent and a template agent to prepare a sound-absorbing slurry; impregnating the perforated sound-absorbing cotton with the sound-absorbing slurry for a preset period; and drying the perforated sound-absorbing cotton impregnated with the sound-absorbing slurry to remove a liquid in the perforated sound-absorbing cotton.

First claim

The invention claimed is:

1. A preparation method of a sound-absorbing piece, comprising:
preparing perforated sound-absorbing cotton matched with a preset cavity in shape;
mixing sound-absorbing material powder with a solvent and a template agent to prepare a sound-absorbing slurry;
impregnating the perforated sound-absorbing cotton with the sound-absorbing slurry for a preset period; and
drying the perforated sound-absorbing cotton impregnated with the sound-absorbing slurry to remove a liquid in the perforated sound-absorbing cotton.

2. The preparation method according to claim 1 , wherein the perforated sound-absorbing cotton is made from polyurethane or melamine.

3. The preparation method according to claim 1 , wherein equal-proportional compression is performed on the perforated sound-absorbing cotton to ensure that the perforated sound-absorbing cotton is matched with the preset cavity in size.

4. The preparation method according to claim 1 , wherein cells with apertures of less than 0.5 mm account for more than 85% of all cells in the perforated sound-absorbing cotton.

5. The preparation method according to claim 1 , wherein the sound-absorbing material powder is zeolite powder or white carbon black.

6. The preparation method according to claim 1 , wherein the template agent accounts for 1-35% of the sound-absorbing slurry by mass.

7. The preparation method according to claim 1 , wherein the sound-absorbing slurry is doped with a binding agent, and the binding agent is inorganic silica sol or fibrous resin and accounts for 1-35% of the sound-absorbing slurry by mass.

8. The preparation method according to claim 1 , wherein a drying temperature range is 40-150° C., and a drying atmosphere comprises nitrogen.

9. The preparation method according to claim 1 , wherein after the drying, the perforated sound-absorbing cotton is roasted, the roasting temperature range is 120-420° C., the heating rate of the roasting is 10-80° C./h, and the roasting time is 0.5-96 h.

10. A sound-absorbing piece, wherein the sound-absorbing piece is provided with perforated sound-absorbing cotton into which sound-absorbing material powder is adhered, the perforated sound-absorbing cotton is made from polyurethane or melamine, cells with apertures of less than 0.5 mm account for more than 85% of all cells in the perforated sound-absorbing cotton, and the sound-absorbing material powder at least comprises zeolite powder or white carbon black.

Assignees

• Goertek Inc

Inventors

• Cao Xiaodong

Classifications

• H04R31/00 Primary

  Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor {(manufacture of microstructural arrangements of deformable or non-deformable structures in general B81C1/00182)} · CPC title

• G10K11/162 Primary

  Selection of materials · CPC title

• H04R1/2811

  for loudspeaker transducers · CPC title

• D04H1/02

  Cotton wool; Wadding · CPC title