聚氨酯泡沫吸声材料的制备及性能研究

摘要

Identify the one-step molding preparation process parameters of rigid PU foam and its effect on foam proper-ty.Use standing wave tube absorption coefficient tester,and open closed pore rate locator,universal testing machine,elec-tron scanner and other machines to test PU's acoustic absorptivity,intensity and microstructure.The results show that when the weight of foaming agent is 8 g,evenly defoamer is 1 .5 g,the reaction temperature is 30 ℃,and the PU's acoustic absorptivity is 0.42,then the property of sound absorption material would be better after heating at 130 ℃ about 10 hours which acoustic absorptivity,intensity is 0.47and 0.68 MPa.SEM shows that it has a uniform distribution to open the pore and obdurate coexist microstructure.%利用一步法制备聚氨酯泡沫吸声材料，探究了配方和发泡工艺对泡沫材料性能的影响，对材料的吸声系数、力学强度和微观结构进行了测试与表征。结果表明，当发泡剂为8 g、匀泡剂为1．5 g、反应温度为30℃时，聚氨酯泡沫的吸声系数为0．42；经130℃处理10 h后，聚氨酯吸声材料具有较好的综合性能，其吸声系数和力学强度分别为0．47和0．68 MPa。SEM观测显示，吸声材料形成了分布均匀有利于吸声的开孔-闭孔共存体系。