摘要
为提高薄板均质吸声材料低频段的吸声性能,文中采用甲苯-2,4-二异氰酸酯(2,4-TDI)、聚醚二醇(PPG)和3,3′-二氯-4,4′-二氨基二苯基甲烷(MOCA)等原料合成了25mm厚聚氨酯弹性体,对其进行填料改性和开空腔设计,并考虑到实用性,制备了聚氨酯弹性体夹芯复合结构的声学试件,在脉冲声管中测试了其反射系数和吸声系数,结果表明,云母填料改性和开空腔可以改善聚氨酯弹性体的低频吸声性能,其吸声性能还受到填料尺寸、空腔形状和空腔个数等参数的影响,因此合理地设计实验工艺参数,可以得到水下声学性能更佳的聚氨酯弹性体夹芯材料,为进一步研究水下吸声材料和吸声结构提供了理论参考。
The 25 mm thick polyurethane elastomers were synthesized from toluene-2,4-diisocyanate (2,4-TDI), polyether diol(PPG) and 3,3′-dichloro-4,4′-diamino diphenylmethane(MOCA) for improving the sound absorption properties of uniform thin plate material at low frequency. The polyurethane elastomers were reinforced by adding mica fillers and cavity. Taking into account the practicality, the polyurethane elastomers sandwich composite structure samples were prepared. The sound reflection coefficient and sound absorption coefficient of these samples were measured in the sound pulse tube. The experiment results indicate that underwater sound absorption properties of polyurethane elastomers are improved at low frequency by mica filler-reinforce and adding cavity. Underwater acoustic properties of the polyurethane elastomers sandwich composite structure are affected by the mica sizes, cavity shape, cavity number, etc. So, polyurethane elastomers sandwich composite of much better underwater acoustic properties can be gotten by regulating the process parameters. This paper offered the theory reference for the further research of underwater sound absorption material and sound absorption structure.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2010年第7期26-30,共5页
Polymer Materials Science & Engineering
关键词
聚氨酯弹性体
夹芯复合结构
水下吸声材料
反射系数
吸声系数
polyurethane elastomer
sandwich composite structure
underwater sound absorption material
sound reflection coefficient
sound absorption coefficient