以甲基丙烯酸甲酯、偶氮二异丁腈、聚乙二醇、明胶以及钠化、有机化处理后的蒙脱土为原料,制备了聚甲基丙烯酸甲酯/蒙脱土(PMMA/MMT)多孔微球,并将其作为填料其加入液体硅橡胶泡沫材料中,制备出一种隔声材料。通过扫描电子显微镜、BET测试、激光粒度测试、阻抗管法等分析方法,研究了PMMA/MMT多孔微球的结构与性能,以及其掺入对所制备隔声材料对不同频段噪声的隔声性能的影响。结果表明:包覆MMT后的PMMA多孔微球的比表面积、孔容和孔径都得到提高,粒径均一性较好,将其掺入液体硅橡胶泡沫后,材料的中低频隔声性能显著提升,微球掺量为10%的复合材料对500～2000Hz中频段噪声的隔声量(TL)比未掺微球时提高了44%。
Polymethyl methacrylate/montmorillonite (PMMA/MMT) porous microspheres were prepared with methyl methacrylate,azodiisobutyronitrile,polyethylene glycol,gelatin,and sodiated and organicized montmorillonite as raw materials,and then were added into liquid silicone rubber foams as fillers to obtain sound insulation materials.By means of scanning electron microscope,BET test,laser particle size test and other analysis methods,the structure and properties of the PMMA/MMT porous microspheres were investigated,and the effect of the incorporation on the sound insulation performance of the prepared sound insulation material to the noise in different frequency bands were also explored.The results showed that the specific surface area,pore volume and pore size of the PMMA porous microspheres were improved after coating MMT,and the particle size uniformity was good.After doping them into liquid silicone rubber foam,the sound insulation performance of the material in low and medium frequencies was significantly improved.The sound insulation volume (TL) of the composite material with 10% microspheres to the noise of 500～2 000 medium frequency was 44% higher than that of the material without microsphere doping.
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