SiO_2/凹凸棒石纳米复合材料的制备及在硅橡胶中的应用

Preparation of SiO_2/Attapulgite nanoparticles and its use in silicone rubber

以硅酸钠为硅源,采用化学沉淀法在凹凸棒石表面原位生成纳米SiO2,制备SiO2/凹凸棒石纳米复合粉体。利用FTIR,TG-DTG,TEM,氮气吸附脱附曲线等方法对复合材料进行表征。以它为补强剂,采用机械共混法对甲基乙烯基硅橡胶(MVQ)进行填充,制备了具有优异力学性能的纳米AT/MVQ复合材料。结果表明,在凹凸棒石表面存在无晶型的SiO2粒子的同时,凹凸棒石分散体之间也存在SiO2的聚集体,粒径大约在6～8nm,复合材料应用在硅橡胶中具有补强效果。

SiO2/Attapulgite nanpowder was successfully synthesized via the chemical deposition method using sodi- um silicate solution as silica soure,and their structures and properties were characterized by X-ray diffraction（XRD）, Fou- rier transform infrared spectromer （FTIR）, transmission electron microscopy （TEM）, thermogravimetric analysis （TGA）, and N2 adsorption-desorption isotherms. Methyl-vinyl silicone rubber（MVQ）was reinforced with nanpowder as reinforcing filler. Even more excellent mechanical silicone rubber was prepared by mechanically compounding. Results showed that there was noncrystal silca on the surface of attapulgite and the particle diameters of the prepared nanometer silica were be- tween 6nm and 8nm in the optimum condition. The results showed that nanpowder exhibited the better reinforcement to MVQ and using modified attapulgite as filler further improved the mechanical properties.