中空涤纶增强橡胶基复合材料层合非织造布的吸声性能

为改进氢化羧基丁腈橡胶（HXNBR）/单孔中空涤纶短纤复合材料（HF）在中低频的吸声性能，将厚度为1 mm、质量比为70/30制取的HF与厚度为3mm、面密度为300g/ m²的针刺单孔中空涤纶短纤非织造布（NPH）层合制取了双层材料 HF-NPH、三层材料 HF-NPH-HF 和 NPH-HF-NPH。研究认为：双层材料以HF为入射面可有效改进材料在中低频的吸声性能，吸声系数在 750Hz 处达到峰值 0.761，吸声系数大于 0.2 的有效频域为550~1700Hz，但在 1700Hz 以上中高频吸声性能 差；三层材料则在中低频吸声性能优异的同时中高频吸声性能也较好，吸声系数大于 0.2 的有效频域均为 450~2500Hz，在此范围内平均吸声系数均大于0.56，但总体上NPH-HF-NPH吸声性能更优。

Sound absorption properties of hollow polyester reinforced rubber-based composite laminated nonwoven

In order to improve the sound absorption property of hydrogenated carbozyl nitrile rubber/single-hollow polyester composite (HF) , HF with amass ratio of 70/30 was fabricated, then laminated the HF with the 3mm thickness hollow needle-punched hollow polyester fiber nonwoven(named NPH) which has a fabric weight of 300 g·m-2. Three kinds of laminated material HF-NPH, HF-NPH-HF, NPH-HF-NPH were fabricated and sound absorption properties were tested. For the double laminated material HF-NPH, different incident surface showed different sound absorption property. Setting the HF as incident surface could effectively improve the sound absorption property of HF-NPH in mid-low frequency, but has a poor sound absorption property in mid-high frequency. For the triple laminated material HF-NPH-HF and NPH-HF-NPH, they have excellent sound absorption property both in mid-low frequency and mid-high frequency. The effective frequency range of sound absorption coefficient more than 0.2 was broadened to 450-2500Hz, and the average absorption coefficient is greater than 0.56 in the effective frequencybandwidth. Generally, sound absorption property ofNPH-HF-NPH isslightly better than that ofHF-NPH-HF.