疏水纳米二氧化硅溶胶在高温硫化硅橡胶中的应用

Application and Research of Hydrophobic Nano Silica Sol in High-temperature Vulcanized Silicone Rubber

将自制的不同比表面的疏水纳米二氧化硅溶胶以不同用量添加到甲基乙烯基硅橡胶(VMQ)中进行补强,以考察比表面和用量对所得高温硫化(HTV)硅橡胶的机械力学性能的影响。另制备3种由不同型号气相纳米二氧化硅补强的HTV硅橡胶,与疏水纳米二氧化硅溶胶补强的HTV硅橡胶进行机械力学性能对比。结果表明:在VMQ中应用时,疏水纳米二氧化硅溶胶具有更高补强能力,仅30份疏水纳米二氧化硅溶胶就大大超过40份气相纳米二氧化硅才能达到的补强效果。在分析两者的比表面、界面性质及透射电镜观测结果基础上,初步探讨了造成两类填料不同补强效果的可能原理。

Hydrophobic nano silica sols with different specific surface area were prepared and incorporated into vinylmethylpolysiloxane （VMQ）. and effects of the specific surface area and content of hydrophobic nano silica on the mechanical properties of high-temperature vulcanized （HTV） silicone rubber were investigated. HTV silicone rubbers filled with three types of fumed nano silica were also prepared for comparison with HTV silicone rubber reinforced by hydrophobic nano silica sol. The mechanical properties datashowed that when used in VMQ, hydrophobic nano silica sol exhibited even stronger reinforcing ability than fumed nano silica. In fact, the reinforcement of only 30 phr（ per hundred rubber） hydrophobic nano silica sol greatly exceeded that of 40 phr（ per hundred rubber） fumed nano silica. Based on the different specific surface area, interfacial property and observations via transmission electronic microscope （TEM）, possible mechanism for the different reinforcement of two kinds of filler were analyzed and discussed preliminarily.