▎ 摘　　要

NOVELTY - The preparation method of sound absorbing material involves (i) surface activating a nanofiber foam, (ii) dissolving phenolic adhesive, graphene, and zinc oxide quantum dots in acetone, and ultrasonically processing for 24-48 hours to obtain a mixed slurry, (iii) treating the nanofiber with supercritical carbon dioxide fluid and mixed slurry, reducing pressure, removing nanofiber foam from supercritical carbon dioxide fluid, uniformly dispersing phenolic adhesive oxidized graphene and zinc oxide quantum dots on the fiber surface, and (iii) thermally crosslinking adhesive and curing. USE - Preparation of sound absorbing material (claimed). ADVANTAGE - The method enables the preparation of sound absorbing material with excellent sound absorbing performance, thickness of 5 mm, low-frequency sound absorption coefficient of 0.70 or more, and maximum sound absorption coefficient of 0.99 or more. DETAILED DESCRIPTION - The preparation method of sound absorbing material involves (i) surface activating a nanofiber foam, (ii) dissolving phenolic adhesive, graphene, and zinc oxide quantum dots in acetone, and ultrasonically processing for 24-48 hours to obtain a mixed slurry, (iii) treating the nanofiber with supercritical carbon dioxide fluid and mixed slurry at 40-45 degrees C, and 2x 107-4x 107 Pa, reducing pressure, removing nanofiber foam from supercritical carbon dioxide fluid, uniformly dispersing phenolic adhesive oxidized graphene and zinc oxide quantum dots on the fiber surface, and (iii) thermally crosslinking the adhesive and curing.