Abstract:

In order to improve the sound absorption property of hydrogenated carbozyl nitrile rubber/single-hollow polyester composite (HF) , HF with a mass 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 frequency bandwidth. Generally, sound absorption property of NPH-HF-NPH isslightly better than that of HF-NPH-HF.

Key words: hydrogenated carboxyl nitrile rubber, hollow polyester, composite, sound absorption