Sound-absorbing material block, method for preparing thereof, and electronic device

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

• step S1:
• mixing raw materials to prepare a mixed paste, where the raw materials comprise a porous material, a gelling agent, a cross-linking agent, a binder, a foaming agent, and a solvent, a content of the gelling agent is 1 wt % to 5 wt % of a mass of the porous material, a content of the cross-linking agent is 5 wt % to 20 wt % of a mass of the gelling agent, a content of the binder is 2 wt % to 10 wt % of the mass of the porous material, and a content of the foaming agent is 1 wt % to 5 wt % of the mass of the porous material;
• the cross-linking agent as a gel material is added as a support in the raw materials;
• the gelling agent is one or more of materials of hydroxymethyl cellulose sodium, hydroxypropyl methyl cellulose, sodium alginate, chitosan, polyethylene glycol, polyvinyl alcohol, and polypropylene chloride;
• the cross-linking agent is one or more of glutaraldehyde, boric acid, calcium chloride, and calcium carbonate;
• the porous material is zeolite and/or activated carbon, the zeolite is one or more of structures of an MFI molecular sieve, an MEL molecular sieve, and an FER molecular sieve, and a particle size of the zeolite is less than 10 μm;
• the binder is one or more of polyacrylate, styrene-butadiene emulsion, polystyrene acrylate, polystyrene acetate, polyurethane resin, and polyethylene vinyl acetate salt;
• the foaming agent is an inorganic foaming agent or an organic foaming agent, and the inorganic foaming agent is one or more of hydrogen peroxide, ammonium bicarbonate, and sodium bicarbonate;
• and the organic foaming agent is one or more of azodicarbonamide, polymer hollow microspheres, polyurethane foam particles, and PE foam particles;
• the solvent is one or more of water, methanol, ethanol, butanol, and ethyl acetate;
• and
• step S2:
• filling the mixed paste into a speaker rear cavity of a speaker provided in advance, and then performing drying treatment and dehydration treatment to obtain the sound-absorbing material block.