Abstract: The present disclosure provides a molecular sieve, a sound absorbing material using the molecular sieve, and a speaker. The molecular sieve is a core-shell molecular sieve. The core-shell molecular sieve includes a core phase molecular sieve and a shell layer molecular sieve. The shell layer molecular sieve has a greater average pore diameter than the core phase molecular sieve. The porous shell layer molecular sieve having the greater pore diameter can protect the internal functioning micropores from being blocked, so that a resonant frequency f0 of a same volume of molecular sieve can be reduced, the bass effect and performance stability are significantly improved.

Abstract: The present disclosure provides a sound absorbing material and a preparation method thereof. The sound absorbing material includes a porous powder core and an adhesive coating the porous powder core. A porous powder dispersion solution and an adhesive dispersion solution are simultaneously subjected to spray granulation via a nozzle having an inner ring nozzle and an outer ring nozzle, so that the porous particles having a structure including a porous powder core and an adhesive coating the porous powder core are formed. The porous particles prepared by the method of the present disclosure when serving as a sound absorbing material of a sounding device have high strength and is not easy to be broken. Moreover, a total amount of the adhesive used in the method of the present disclosure is less than that in the conventional method, so that cost is effectively saved.