Sound-absorbing block material as well as preparation method and application thereof: Fid-Bau Portal

Sound-absorbing block material as well as preparation method and application thereof

WANG ZHONGYANG / ZHANG JIE / WANG HEZHI / WANG CHAO

The invention provides a sound-absorbing block material as well as a preparation method and application thereof. The sound-absorbing block material is provided with gradient pores of which the diameters are gradually increased from the inside to the surface layer; and the thickness of the sound absorption block material is 0.5 to 5 mm. The sound-absorbing block material has gradient pores, the diameters of the pores are gradually increased from the interior of the block material to the surface layer, the pores can enable a sound-absorbing material in the sound-absorbing block material to be exposed in air to play a role, and the gradient change between the pores can reduce air vibration damping; the bonding strength between the raw materials of the sound absorption material is high, powder falling is reduced, and the stability of the pore structure is guaranteed; the surface layer of the sound-absorbing block material is provided with macropores with the diameter of 20-200 microns, when the sound-absorbing block material is attached to a sound production rear cavity, the attaching surface can be exposed in air to play a role, and the performance of the block material in the rear cavities of loudspeakers with different shapes is improved.

本发明提供了一种吸音块材及其制备方法和应用；所述吸音块材具有直径由内部至表层逐渐增加的梯度孔隙；所述吸音块材的厚度为0.5‑5mm。本发明的吸音块材具有梯度孔隙，所述孔隙直径由块材内部到表层逐渐增加，所述孔隙能使吸音块材内部吸声材料暴露在空气中发挥作用，孔隙之间的梯度变化能降低空气振动阻尼；所述吸声材料的原料之间的粘接强度大、减少了掉粉并且保证了所述孔隙结构的稳定性；所述吸音块材表层为直径为20‑200μm大孔隙，当所述吸音块材与发声后腔贴合时，贴合面也能暴露在空气中发挥作用，提高了块材在不同形貌扬声器后腔时的性能。

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