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以多苯基多亚甲基多异氰酸酯(PAPI)和聚醚多元醇为原料,采用聚氨酯改性方法合成了改性聚异氰脲酸酯泡沫体声学材料,并用扫描电子显微镜分析了泡沫的泡孔结构,还对泡沫的吸隔声性能、拉伸性能和阻燃性能进行了研究。实验结果表明,研制的泡沫材料具有比较均匀的泡孔结构,并具有较好的吸隔声性能、阻燃性能及拉伸强度,当泡沫材料厚度为20mm时,在125Hz~4000Hz范围内的平均吸声系数为0.34(驻波管法),在125Hz~8000Hz范围内的平均隔声量(声强法)21.7dB,氧指数为30.5,拉伸断裂强度为614.9kPa。另外研究结果还表明,在以聚氨酯改性聚异氰脲酸酯泡沫为主体材料的复合材料中,表面所加的饰面层对其吸隔声性能一般有较大的影响。
Polyphenylenepolymethylene polyisocyanate (PAPI) and polyetherpolyol were used as raw materials to synthesize the modified polyisocyanurate foam acoustical materials by polyurethanemodification method. The foam of foam was analyzed by scanning electron microscope Pore structure, but also on the acoustic properties of foam insulation, tensile properties and flame retardant properties were studied. The experimental results show that the developed foam has a relatively uniform cell structure and sound insulation performance, flame retardant properties and tensile strength. When the thickness of the foam is 20 mm, the average value of the foam in the range of 125 Hz to 4000 Hz The sound absorption coefficient was 0.34 (VSWR method), the average sound insulation (sound intensity method) was 21.7 dB in the range of 125 Hz to 8000 Hz, the oxygen index was 30.5, and the tensile rupture strength was 614.9 kPa. In addition, the results also show that, in the composite material with polyurethane modified polyisocyanurate foam as the main material, the decorative layer applied on the surface generally has a greater influence on the sound absorption performance of the composite.