废弃羊毛吸声复合材料的制备及其性能

doi:10.13475/j.fzxb.20171101307

Abstract

Abstract:

In order to solve the problem of regenerative recycling of waste wool and develop sound absorbing materials with high sound absorption coefficient and wide sound absorption frequency band, the waste wool/ ethylene vinyl acetate copolymer（EVA） sound absorption composites were prepared by hot pressing method. Waste wool were used as reinforced material and EVA was taken as matrix material. The influence of hot-pressing temperature, density of composites, mass fraction of waste wool, thickness of composites, thickness of the air layer and wool arrangement on the sound absorption coefficient were measured by the transfer function method. The results show that the wool/EVA sound absorption composites have excellent sound absorption performance at low, medium and high frequencies. The sound absorption performance of the composites was prominent in the middle and low frequency region. The sound absorption coefficient reached 0.9 at 1 000 Hz, the noise reduction coefficient is 0.65, and the average sound absorption coefficient is 0.6. The sound absorption mechanism of the wool/ EVA sound absorption composites were high efficiency sound absorbing material. Finally, the reason of the excellent sound absorption performance of discarded wool fibers/EVA sound absorption composites with excellent sound absorbing properties is that the acoustic energy is converted into kinetic energy and thermal energy by exciting the interior of the material.

Key words: waste wool, ehtylene-vinyl acetate copolymer, sound absorption composite, sound absorption property, sound absorption mechanism

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Preparation and properties of sound absorption composites based on waste wool

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