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    Process for producing silica particles suitable for use as filler for paper
    1.
    发明申请
    Process for producing silica particles suitable for use as filler for paper 失效
    适用于纸张填料的二氧化硅颗粒的生产方法

    公开(公告)号：US20010018038A1

    公开(公告)日：2001-08-30

    申请号：US09832948

    申请日：2001-04-12

    申请人： Oji Paper Co., Ltd.

    发明人： Masashi Matsuda ,  Masasuke Watanabe ,  Hitoshi Okada ,  Motohide Wada ,  Osamu Kitao

    IPC分类号： C01B033/12

    CPC分类号： C01B33/187 ,  C01B33/18 ,  C01P2004/52 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/16 ,  C01P2006/19 ,  C01P2006/60 ,  D21H17/68 ,  D21H21/52

    摘要： The present invention relates to a process for easily and efficiently producing silica particles having a narrow particle size distribution and a high porosity from inexpensive starting materials such as sodium silicate. The silica particles of the present invention can be obtained in the form of a slurry containing them by (1) forming a slurry by mixing first particles difficultly soluble in an alkali and soluble in an acid, with an aqueous alkali silicate solution to form a first slurry containing the first particles, (2) neutralizing the first slurry with a mineral acid to prepare a second slurry containing second particles wherein silica is deposited on the first particles, and (3) adding a mineral acid to the second slurry to dissolve the first particles from the second particles, to prepare a third slurry containing silica particles. When the silica particles of the present invention are used as a filler even in a small amount for paper making, the resultant papers have excellent brightness, opacity, opacity-after-printing, etc.

    摘要翻译： 本发明涉及从廉价的原料如硅酸钠容易且有效地生产具有窄的粒度分布和高孔隙率的二氧化硅颗粒的方法。 本发明的二氧化硅颗粒可以通过（1）通过将难溶于碱溶解于酸中的可溶于酸的第一种颗粒与碱性硅酸钠溶液混合形成浆料形成浆料形式而获得， 含有第一颗粒的浆料，（2）用无机酸中和第一浆料，以制备含有二氧化硅沉积在第一颗粒上的第二颗粒的​​第二浆料，和（3）向第二浆料中加入无机酸以溶解第一颗粒 从第二颗粒的​​颗粒，制备含有二氧化硅颗粒的第三浆料。 当本发明的二氧化硅颗粒作为填料即使少量用于造纸时，所得的纸具有优异的亮度，不透明度，印刷后不透明度等。