Sound-absorbing material particle and preparation method thereof

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

• mixing a sound-absorbing raw material with a solvent to make a sound-absorbing slurry;
• filling the sound-absorbing slurry into a mechanical compression die, and performing compression molding on the sound-absorbing slurry to form a particle;
• performing a hydrothermal crystallization reaction on the particle to crystallize the sound-absorbing raw material in the particle and generate a microporous structure in an interior thereof, wherein a pore volume of the microporous structure is between 0.2 ml/g and 2.0 ml/g;
• and
• drying the particle, after performing the hydrothermal crystallization reaction, to produce the sound-absorbing material particle,
• wherein the sound-absorbing material particle or the particle, after performing the hydrothermal crystallization reaction, is subjected to a roasting process, wherein the roasting process is performed at a roasting temperature in a range of 280° C. to 550° C., wherein a heating rate of the roasting process ranges from 25° C./h to 65° C./h, and wherein a roasting time of the roasting process is in a range of 20 h to 65 h.