Sound-absorbing material, method for preparing same, and speaker using the sound-absorbing material

A method for preparing a sound-absorbing material, comprising:

• S1, formulating a sound-absorbing slurry, the sound-absorbing slurry being composed of a mixture of a sound-absorbing powder, adhesives, fillers, thickeners, and water;
• wherein the sound-absorbing slurry has a viscosity of 100 cP to 10000 cP, and relative to 100% of a total mass of the sound-absorbing slurry, the sound-absorbing powder accounts for 30% to 60%, the adhesives account for 3% to 10%, the fillers account for 1% to 10%, the thickeners accounts for 1% to 5%, and the water account for 15% to 65%;
• S2, coating the sound-absorbing slurry onto a surface of a film;
• or injecting the sound-absorbing slurry into a mold;
• S3, placing the film or the mold at an inlet of a freezing conveyor belt, and sequentially freezing and crystallizing the film or the mold in a first freezing zone and a second freezing zone to obtain a film sample and a mold sample;
• wherein a temperature in the second freezing zone is lower than a temperature in the first freezing zone;
• S4, taking out the film sample or the mold sample from an exit end of the freezing conveyor belt, and placing the film sample or the mold sample into a low-pressure vacuum environment with a pressure of 0 to 500 Pa for a sublimation treatment to remove ice in the film sample or the mold sample to obtain an ice-free sample;
• and
• S5, placing the ice-free sample into an oven for drying for a predetermined duration to obtain the sound-absorbing material.