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    • 29. 发明申请
    • Cake of easily dispersible precipated silica and process for producing the same
    • 蛋糕易分散的沉淀二氧化硅及其制备方法
    • US20060154004A1
    • 2006-07-13
    • US10520466
    • 2003-07-04
    • Hirokatsu HayashiKenji FukunagaKentaro Fukuda
    • Hirokatsu HayashiKenji FukunagaKentaro Fukuda
    • B41M5/40
    • C01B33/143B41M5/5218B41M5/5245C01P2004/50C01P2004/62C01P2004/80C01P2006/12
    • A silica cake formed of easily dispersible precipitated silica having small primary particle size is provided, from which highly transparent silica dispersion can be effectively obtained. This silica cake is characterized by being a cake of precipitated silica having BET specific surface area of at least 220 m2/g, and when it is dispersed in ion-exchange water to provide an aqueous dispersion of the silica of 5% by weight in concentration and further diluted to reduce the silica concentration to 1.5% by weight, the dispersion having a light-scattering index (n-value) of at least 2. This silica cake can be obtained by simultaneously adding an alkali silicate and a mineral acid to a reaction liquid whose pH is being maintained at a fixed value within a range of 7.5-11.5 and whose temperature is being maintained at not lower than 90° C., whereby forming precipitated silica through their reaction, and separating said precipitated silica from the reaction liquid in wet state.
    • 提供由容易分散的一次粒径小的沉淀二氧化硅形成的硅饼,由此可以有效地获得高度透明的二氧化硅分散体。 该二氧化硅饼的特征在于BET比表面积至少为220m 2 / g以上的沉淀二氧化硅饼,当将其分散在离子交换水中以提供水分散体 二氧化硅浓度为5重量%,并进一步稀释以将二氧化硅浓度降低至1.5重量%,所述分散体的光散射指数(n值)至少为2.该二氧化硅饼可以通过同时加入 碱性硅酸盐和无机酸反应到其pH保持在7.5-11.5的范围内并将温度保持在不低于90℃的固定值的反应液中,由此通过其反应形成沉淀二氧化硅,以及 在湿态下将所述沉淀二氧化硅与反应液分离。