轻质热塑性复合片材吸声性能

Sound Absorption Properties of Lightweight Reinforced Thermoplastic Laminates

以聚丙烯树脂和玻璃纤维为原料,依托预混粉体浸渍专利技术,无需发泡剂,制备出轻质多孔、吸声降噪的轻质热塑性复合材料。利用SEM、偏光显微镜和毛细渗透实验研究了材料的微结构与吸声特性的关系。通过使用驻波管测量材料的吸声系数,分析了材料的厚度和面密度对材料吸声性能的影响。结果表明:材料的多孔微结构有利于声能的吸收;4mm厚的片材,峰值吸声系数达0.65;材料厚度和面密度的增大,能显著提高其吸声性能,特别是低中频吸声性能。

Patent technology-premixing powder impregnation processing is adopted in fabricating porous sound absorbing lightweight thermoplastic composites （LWRT） from polypropylene and glass fibers without foaming agent. The microstructure of LWRT was characterized by the scanning electron microscopy and polarized micrographs as well as capillary penetration, the sound absorption coefficient of LWRT was tested ina standing wave tube. It is shown that the porous structures allow LWRT laminates to attenuate sound wave energy and the peak value of sound absorption coefficient reaches 0.65 when thickness is 4.00 mm. The sound absorption property at middle-low frequency is enhanced with the increasing thickness and weight per unit area.