Preparation and properties of polylactic acid ultrafine fiber/nonwovens sound-absorbing materials
At present,petroleum-based porous sound-absorbing materials are widely used in the market,and there are still a series of problems to be solved in environmental protection.Therefore,it is necessary to develop green and degradable porous sound-absorbing materials.Polylactic acid(PLA)needle-punched nonwovens were prepared by needle-punched nonwoven process using PLA fiber as raw material.The effects of number of punching passes,fiber feeding amount and needling depth on the structure and sound absorp-tion properties of nonwovens were investigated.The results show that larger fiber feeding amount and appropriate needling depth can significantly improve the sound absorption performance.The sound absorption coefficient of needle-punched nonwoven(PLA300-8-5)with density of 300 g/m2 prepared under 8 punching passes number and 5 mm needling depth can reach 0.56.Then,different morphol-ogies of PLA ultrafine fibers were prepared by electrospinning technology,and they were combined with PLA300-8-5 nonwoven sub-strate to construct PLA ultrafine fiber composite sound absorption materials.The effects of fiber morpholo-gy and ultrafine fiber mem-brane thickness on the sound absorption properties of the materials were investigated.The results show that porous fibers and thicker fiber membranes can effectively enhance the sound absorption properties.The construction of PLA ultrafine fiber composite sound-absorbing material provides a theoretical basis for the design and development of new high-efficiency sound-absorbing materials.
polylactic acidneedle clothmorphology of fibercompositesound-absorbing material
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