烯烃聚合用特种性能二氧化硅的合成

Synthesis of special SiO2 for olefin polymerization

采用具有独特技术的晶核、粒子增长及凝胶法制备了聚烯烃催化剂载体硅胶，分析了硅胶粒子成核机理。扫描电子显微镜分析及试验表明，成核温度宜为70—80℃，pH值为9．0—9．5，成核时间为50—70min，所得母液二氧化硅的质量分数为3％-5％；凝胶化温度为60—70℃，凝胶化pH值为6—8。用所得硅胶制备的催化剂活性基本与用进口硅胶制备的催化剂相当。

Silica support for metallocene catalyst was prepared by nucleation, particle growth and gelation. Firstly, silica nuclei were formed by aging of thin sodium silicate solution as mother liquid, growing into SiO2 hydrosol with suitable particle size by sodium silicate and inorganic acid. The desired silica support was obtained after post treatment.