【摘要】 熔喷法制备的熔喷非织造布在吸声降噪领域发挥着重要作用，其材料结构以及组分特性对吸声性能有着决定性的影响。以聚对苯二甲酸乙二醇酯(PET)和聚对苯二甲酸丁二醇酯(PBT)熔喷非织造布为试样，分别测试了其吸声系数，考察了材料厚度、纤维直径以及组分特性对材料吸声性能的影响。并且将聚酯熔喷非织造布与商业吸声材料以不同的排列方式复合，研究了聚酯熔喷非织造布及其复合结构对商业吸声材料吸声性能的提升效果。结果表明，非织造布厚度的增加能有效提升中低频处的吸声性能，且吸收系数峰值随厚度增加向低频处移动；由柔性更好的PBT组分制备成的吸声材料有更优良的吸声性能，在特定频率处其吸声系数是相同厚度PET熔喷非织造布的2倍；当聚酯熔喷非织造布(致密层)与商业吸声材料(蓬松层)以致密层-蓬松层-致密层-蓬松层的结构排列时，聚酯熔喷非织造布对商业吸声材料的吸声性能提升最优，中低频处吸声系数可达0.99,在高频处吸声系数峰值为0.98,具有良好的宽频吸声性能。更多还原

【Abstract】 The melt-blown nonwoven fabric prepared by the melt-blown method plays an important role in the field of sound absorption and noise reduction, and its material structure and component characteristics have a decisive impact on its sound absorption performance. This article uses two different types of polyester(polyethylene terephthalate(PET) and polybutylene terephthalate(PBT)) melt-blown nonwoven fabrics as samples to test their sound absorption coefficients, and investigates the effects of material thickness, fiber diameter, and component characteristics on the sound absorption performance of sound absorbing materials. And the polyester melt-blown nonwoven fabric was composite with commercial sound-absorbing materials in different arrangements, and the improvement effect of polyester melt-blown nonwoven fabric and its composite structure on the sound-absorbing performance of commercial sound-absorbing materials was studied. The results show that an increase in material thickness can effectively improve the sound absorption performance at mid to low frequencies, and the peak absorption coefficient shifts towards low frequencies with increasing thickness. The sound-absorbing material prepared from PBT components with better flexibility has better sound absorption performance, and its sound absorption coefficient at specific frequencies is twice that of PET melt blown nonwoven fabric with the same thickness. When polyester melt-blown nonwoven fabric is arranged with commercial sound-absorbing materials in a structure of dense layer fluffy layer dense layer fluffy layer, polyester melt-blown nonwoven fabric has the best improvement in sound absorption performance of commercial sound-absorbing materials, the peak sound absorption coefficient at medium and low frequencies is 0.99, and the sound absorption coefficient at high frequencies can reach 0.98, indicating good broadband sound absorption performance.更多还原