粟米壳-聚氨酯复合吸声材料吸声性能研究

Study on Sound Absorption Properties of Corn Shell-Polyurethane Composite Sound Absorption Material

以聚氨酯和粟米壳为原材料,采用一步法成功制备出具有多孔道连通结构的粟米壳-聚氨酯复合吸声材料。对比了聚氨酯泡沫材料加入粟米壳微粒前后的吸声性能,探究了粟米壳微粒占比、粟米壳微粒粒径以及材料厚度对粟米壳-聚氨酯复合吸声材料吸声性能的影响。结果表明,在研究范围内,添加了粟米壳微粒后的聚氨酯泡沫材料的吸声峰值向低频移动,其中当粟米壳微粒粒径为0.2 mm以下、质量份数为6份时材料的吸声性能最好,吸声系数峰值达到0.994,对应频率为1530 Hz。证明粟米壳-聚氨酯复合吸声材料低频吸声性能随着材料厚度的增加而提高。

Using polyurethane and corn shell as raw materials,the sound absorbing material of corn shell-polyurethane with multichannel connected structure was successfully prepared by one-step method.The sound-absorbing properties of polyurethane foam material before and after adding corn shell particles were compared,and the effects of proportion of corn shell particles,grain size of corn shell particles,material thickness and the depth of cavity behind the material on the sound-absorbing properties of corn shellpolyurethane composite sound-absorbing material were investigated.The results show that,within the research range,the sound absorption peak of polyurethane foam material with corn shell particles move to low frequency.When the grain size of corn shell particles was less than 0.2 mm and the mass fraction was 6,the sound absorption performance of polyurethane foam material was the best,and the peak value of sound absorption coefficient reached 0.994,corresponding frequency was 1530 Hz.For the corn shell-polyurethane composite sound absorption material,the low frequency sound absorption performance of the material increases with the increase of the material thickness.