【摘要】 商品硅溶胶中ＳｉＯ２粒子大小约８ｕｍ，相当比表面积３２０ｍ２／ｇ。在ｐＨｇ—１０，长时间的高温状态下．硅溶胶中ＳｉＯ２粒子长大。例如在１８５℃，ＰＨ＝１０．５，１２０ｈ条件下，硅溶胶中ＳｉＯ２粒子长大到３０ｕｍ左右．尿素和甲醛在这种大粒子硅溶胶温溶下，控制反应条件可聚合形成新相聚合物微球，烧掉有机物即可形成３２ｕｍ的大孔径多孔硅珠。多孔硅珠的孔径取决于硅溶胶的粒子尺寸．控制硅溶胶的粒子大小和影响微球大小的聚合反应等条件，研制出制备孔径３０—１００ｕｍ，粒子大小５－１０μｍ的多孔硅珠的新工艺．更多还原

【Abstract】 he silica particle size of a commercially available silicasol is around & "m,corresponding to a ipecific surface area of 320 m2/g. The silica particles in silicasol grow during persistent heating Ind at a PH value of 9-10. For example,after heating at 185C and PH 10. 5 for 120h,the silica particle size grows to 30 urn. Urea and formaldehyde are polymerized at the same time of blending kith the large particle size silicasol to form a new phase of polymer microsphere. The organic component is then burned off to obtain porous silica-beads with large 32 urn pore diameter. The pore diameter depends on the particle size of the silicasol. Thus,by controlling silicasol particle size and optimizing conditions of polymerization reaction, porous silica-bead with 30-100 urn pore diameter and 5-10pm particle size can be prepared.更多还原