Sound absorption properties of HXNBR/FHHPF composite with needle-punched hollow polyester nonwoven laminated materials

Four-hole hollow polyester fiber reinforced hydrogenated carboxyl nitrile rubber composite with a mass ratio of 70/30 in 1 mm thickness was fabricated (named A). Then it was laminated with needle punched single-hole hollow polyester nonwoven which was 300 g/m(2) and 3 mm in thickness (named B). Two-layer laminated material AB, three-layer laminated material ABA and BAB were made. Their sound absorption properties were tested. For two-layer laminated material AB, the study found that different incident sides showed different sound absorption properties. When chosen material B as the incident side, AB showed sound absorption properties of porous material. In frequency of 1150 Hz and above, the material has good sound absorption performance. When chosen material A as the incident side, AB has excellent sound absorption property in medium and low frequency, but with inferior property in 1800 Hz and above. For the three-layer laminated material ABA and BAB, the overall sound absorption performance was further enhanced. The sound absorption performance improved in the low and medium frequency while in frequency of 1800 Hz and above it was also good, and material BAB was slightly better than material ABA.