Sound-absorbing material, preparation method thereof and speaker using same

1. A sound-absorbing material, comprising an adsorbent material and a thermal conductive material, wherein the thermal conductive material is uniformly dispersed in the sound-absorbing material, the thermal conductive material comprises a carbon fiber material, and a weight ratio of the carbon fiber material in the sound-absorbing material is within a range of 0.05% to 10%.

2. The sound-absorbing material as described in claim 1 , wherein the weight ratio of the carbon fiber material in the sound-absorbing material is within a range of 0.1% to 5.0%.

3. The sound-absorbing material as described in claim 1 , wherein an average diameter of the carbon fiber material is within a range of 1 nm to 50 um.

4. The sound-absorbing material as described in claim 3 , wherein the average diameter of the carbon fiber material is within a range of 10 nm to 20 um.

5. The sound-absorbing material as described in claim 1 , wherein the carbon fiber material comprises at least one of a nano carbon fiber material or an activated carbon fiber material.

6. The sound-absorbing material as described in claim 1 , wherein a length-diameter ratio of the carbon fiber material is not less than 5.

7. The sound-absorbing material as described in claim 1 , wherein the adsorbent material comprises at least one of a molecular sieve, activated carbon, a metal-organic framework material or a polymer framework material.

8. The sound-absorbing material as described in claim 1 , wherein the adsorbent material and the thermal conductive material are bonded to form into sound-absorbing particles by an adhesive.

9. The sound-absorbing material as described in claim 8 , wherein the adhesive comprises at least one of a polyacrylic adhesive, a polyurethane adhesive, an epoxy resin adhesive, or a cellulose adhesive.

10. The sound-absorbing material as described in claim 1 , wherein the thermal conductive material further comprises a non-carbon fiber material having a weight ratio of 0% to 1% in the sound-absorbing material, and the non-carbon fiber material comprises at least one of boron nitride, boron carbide, aluminum oxide, magnesium oxide, zinc oxide, or graphene.

11. The sound-absorbing material as described in claim 1 , wherein the sound-absorbing material is in form of particles with a particle size of 0.1 mm to 1 mm.

12. A preparation method of the sound-absorbing material as described in claim 1 , comprising following steps:

dispersing an adsorbent material and a thermal conductive material in a solvent and mixing thoroughly to obtain a mixed solution comprising the adsorbent material and the thermal conductive material;

adding an adhesive to the mixed solution comprising the adsorbent material and the thermal conductive material and mixing thoroughly to obtain a slurry comprising the adsorbent material and the thermal conductive material;

granulating the slurry comprising the adsorbent material and the thermal conductive material to obtain product particles; and

heat-treating the product particles to obtain the sound-absorbing material.

13. A preparation method of the sound-absorbing material as described in claim 1 , comprising following steps:

dispersing an adsorbent material in a solvent and mixing thoroughly to obtain a mixed solution comprising the adsorbent material;

adding an adhesive to the mixed solution comprising the adsorbent material and mixing thoroughly to obtain a slurry comprising the adsorbent material;

granulating the slurry comprising the adsorbent material to obtain pre-product particles;

heat-treating the pre-product particles;

dispersing a thermal conductive material in a solvent and mixing thoroughly to obtain a mixed solution comprising the thermal conductive material;

adding an adhesive to the mixed solution comprising the thermal conductive material and mixing thoroughly to obtain a slurry comprising the thermal conductive material;

dispersing the slurry comprising the thermal conductive material on surfaces of the heat-treated pre-product particles by way of coating to obtain product particles; and

heat-treating the product particles to obtain the sound-absorbing material.

14. A speaker, comprising a housing having an accommodating space, a sounding unit placed in the housing, and a rear cavity defined by the sounding unit and the housing, the rear cavity being filled with the sound-absorbing material as described in claim 1 .