Thermally-conductive and sound-absorbing composite material and preparation method thereof, and speaker

A preparation method of a thermally-conductive and sound-absorbing composite material, wherein the thermally-conductive and sound-absorbing composite material comprises following components by mass percent:

• 10%-80% of an activated carbon felt, 5%-75% of zeolite particles, 1%-80% of graphene particles and 5%-40% of an adhesive, wherein the activated carbon felt serves as a skeleton;
• the graphene particles are bonded to an activated carbon fiber surface of the activated carbon felt through the adhesive;
• and the zeolite particles are bonded to surfaces of the graphene particles and the activated carbon fiber surface of the activated carbon felt through the adhesive;
• and
• the preparation method comprises following steps:
• S1:
• cutting the activated carbon felt according to a shape of a rear cavity of a speaker, so as to match with the rear cavity of the speaker;
• S2:
• mixing the zeolite particles, the graphene particles and the adhesive with a foaming agent and a dispersant to obtain a thermally-conductive and sound-absorbing fluid;
• S3:
• soaking the cut activated carbon felt into the thermally-conductive and sound-absorbing fluid to obtain a thermally-conductive and sound-absorbing composite material precursor;
• S4:
• quick-freezing the thermally-conductive and sound-absorbing composite material precursor to shape the thermally-conductive and sound-absorbing composite material precursor;
• S5:
• freeze-drying the thermally-conductive and sound-absorbing composite material precursor shaped to remove the dispersant in the thermally-conductive and sound-absorbing composite material precursor;
• S6:
• baking the thermally-conductive and sound-absorbing composite material precursor after the dispersant is removed, so that the adhesive in the thermally-conductive and sound-absorbing composite material precursor is cured;
• S7:
• ultrasonically cleaning the thermally-conductive and sound-absorbing composite material precursor with water after the adhesive is cured, so that the foaming agent, unfirmly bonded zeolite particles and unfirmly bonded graphene particles in the thermally-conductive and sound-absorbing composite material precursor are removed;
• and
• S8:
• drying the thermally-conductive and sound-absorbing composite material precursor ultrasonically cleaned to remove moisture in the thermally-conductive and sound-absorbing composite material precursor, thereby obtaining the thermally-conductive and sound-absorbing composite material.