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1.序言硅酸与其它细粒子材料,如白色颜料、结晶的填料,硫酸钡等不同,合成硅酸填料具有一系列特性。合成的硅酸填料用X-射线法确定是一种无定形的粉末,在分散状态中它比其它产品的粒子细得多。与硅酸内聚能力(粒子与粒子间的内聚)相联系的两个特点导致如下的特殊性能,即硅酸填料只能存在聚集状态中,可以假设硅酸填料中存在初级粒子;从电子显微镜照片上所观察到的园形粒子和B E T方法测定比表面所获得的,平均粒经相比较,两个数值的数量级相同(0.01……0.02微米相当于比表面积150、……300米～2/克)。但是也并不排除,这些粒子具有疏松的泡沫状性质,而有相当大的内部空隙。
1. Preface Silicic acid is different from other fine particle materials such as white pigments, crystalline fillers, and barium sulfate. Silicic acid filler has a series of properties. The synthetic silicate filler, which is identified by the X-ray method as an amorphous powder, is much finer in dispersion than the particles of other products. Two characteristics associated with the cohesion ability of silicic acid (cohesion between particles and particles) lead to the special properties that the silicic acid filler can only exist in an aggregated state, it can be assumed that there are primary particles in the silicic acid filler; The spherical particles observed on the micrograph and the BET method determine the specific surface area of the obtained average particle by comparison, the magnitude of the two numbers are the same (0.01 ... 0.02 micron corresponds to a specific surface area of 150 ... 300 m / G). However, it is not ruled out that these particles have a loose, foamy nature with rather large internal voids.