改性纳米二氧化硅的制备及其在溶聚丁苯橡胶/顺丁橡胶并用胶中的应用

摘要：以γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)为修饰剂，采用液相原位表面修饰技术，制备了可分散性纳米二氧化硅，并将这种改性后的纳米二氧化硅应用到溶聚丁苯橡胶/顺丁橡胶体系，对其进行力学性能、磨耗性能、流变性能测试，考察了修饰剂的不同用量对复合材料上述性能的影响。傅里叶红外光谱表明，KH570已经成功通过化学键键合在二氧化硅表面，扫描电镜显示其团聚减弱，分散性提高。橡胶纳米复合材料的力学性能有所改善，在修饰量为25-50mmol/kg时性能最佳；耐磨性能明显提高，尤其是修饰量为50mmol/kg时，磨耗体积最少，降低了33.85%；明显降低了Payne效应，减弱了二氧化硅的团聚，提高了其在橡胶基体中的分散性。

Preparation of Modified Nano Silica and Its Application in SSBR/BR Blends

In this paper, the dispersible nano silica was synthetised by liquid phase in-situ modification with KH570 as modifier. To investigate the effects of different amount of modifier on the mechanical properties, abrasion properties, rheological properties of the system of solution polymerization styrene butadiene rubber/butadiene rubber which modified with nano silica were tested. Fourier transform infrared spectroscopy showed that the silica surface had been successfully modified by the KH570 through the chemical bonds. SEM showed that the agglomeration was weakened and improved the dispersion. The mechanical properties of SSBR/BR/SiO2 nanocomposites were improved, the best modified quantity was 25-50mmol/Kg; wear resistance was improved obviously, especially when the amount of modifier was 50mmol/Kg, it had minimum wear volume, reduced by 33.85%; reduced the Payne effect, weakened the agglomeration of silica, and improved the dispersion in the rubber matrix.