以工业原料水玻璃和硫酸为主要原料,通过球磨打浆技术、高效节能环保除杂质技术和具有尾气回收系统的离心喷雾干燥技术制备出2种日产量12 000 kg的用于聚乙烯催化剂的载体高纯度球形介孔硅胶复合材料。2种复合材料在硅胶无序堆积孔中均拥有有序的介孔孔道且球体度均匀,二氧化硅纯度均在99.5%以上。新型材料在负载聚乙烯催化剂后仍然保持良好微观形貌及其特有的介孔材料孔道结构。高压乙烯聚合小试试验结果表明,2种催化剂对乙烯聚合的活性均高于工业用催化剂的活性,催化反应后得到的聚乙烯粉料的重要物性参数均优于工业用948硅胶粉料。

Two kinds of high-purity spherical mesoporous silica gel composites with a daily output of 12 tons are produced with industrial sodium silicate and sulfuric acid as main raw materials,through the ball milling pulping technology,the high-efficiency energy-saving impurity removal technology and the centrifugal spray drying technology with waste gas recovery system.Both composites possess the ordered mesoporous channels in the disordered stacking pores of silica gel,the uniform sphericity and a silica purity above 99.5%.This novel material still maintains a good microstructure and unique mesoporous material pore structure after being loaded with the catalyst for polyethylene.It is indicated from the small-scale test for high-pressure ethylene polymerization that the activity of both catalysts for ethylene polymerization is higher than that of industrial catalysts.The important physical parameters of the polyethylene powder obtained over these catalysts are better than those obtained over industrial 948 silica gel.