Modification of Noise Reduction by SiO2 Nanocomposite: The Case of Earplugs
Main Article Content
When applying different control measures fail to reduce noise exposure to a safe level, using hearing protection devices (HPDs) becomes necessary. The study aim was to investigate the effect of SiO2 nanoparticles on the noise reduction efficiency of PVC earplugs. PVC polymer of type S-60 as the main matrix and SiO2 with a size of 30 nm were used. The PVC / SiO2 nano-composite was mixed at a temperature of 160 ° C and 40 rpm and samples with 0, 0.2 and 0.5 weight percent of SiO2 nanoparticles were prepared. Samples of earplugs with PVC / SiO2 nanoparticles (0.2; 0.5% by weight) when compared to raw earplugs showed the noise attenuation at low frequencies (125-500 Hz) almost the same as that of the raw earplugs. At high frequencies (2-8 KHz), however, the noise attenuation performance of earplugs with SiO2 nanoparticles increased significantly (P <0.05). The results of the present study showed that samples with SiO2 nanoparticles show a stronger noise attenuation at higher frequencies compared to samples without nanoparticles.
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