【摘要】 以 40 0目硅灰石粉配成质量分数为 10 %的悬浮液 ,加无机助剂和聚乙二醇作酸化处理 ,制得比表面积 10 0～ 6 0 0m2 /g、颗粒粒径 6～ 12 μm的多孔性SiO2 粉体。研究表明 ,当其他工艺条件和添加量相同时 ,使用平均相对分子质量为 6 0 0 0的同种聚乙二醇 ,在 10 0g质量分数为 10 %的硅灰石悬浮液中 ,其添加量为 9 4g的样品的比表面积和粒径都最大。初步研究表明 ,这是由于聚乙二醇的高分子网络凝聚和空间位阻效应所致更多还原

【Abstract】 Porous silica powder with specific surface area ranging from 100 m 2/g to 600 m 2/g and diameter of particle ranging from 6 μm to 12 μm is prepared from 10% suspension of wollastonite with inorganic additive and PEG.The research shows that when other technological conditions and the weight of added PEG are the same,the specific surface area and particle size of the sample with PEG of average molecular weight of 6000 are the largest;and with PEG of average molecular weight of 6000 added to 100 g 10% suspensions of wollastonite when the weight of addition is 9 4 g,the specific surface area and particle size of the sample are the largest too.It is clarified that the steric effect leads to this result.更多还原