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    Method of making thin silica flakes
    41.
    发明授权
    Method of making thin silica flakes 失效
    制造薄硅片的方法

    公开(公告)号：US5104632A

    公开(公告)日：1992-04-14

    申请号：US540185

    申请日：1990-06-19

    申请人： David K. Douden ,  Thomas J. Scanlan

    发明人： David K. Douden ,  Thomas J. Scanlan

    IPC分类号： B01J20/10 ,  B01J20/28 ,  C01B33/152 ,  C09D7/12

    CPC分类号： B01J20/28028 ,  B01J20/103 ,  B01J20/28004 ,  B01J20/28016 ,  B01J20/291 ,  C01B33/152 ,  C09D7/1283 ,  C09D7/1291 ,  B01J2220/54 ,  C08K3/36 ,  Y10T428/249964 ,  Y10T428/249986

    摘要： Hydrated sodium silicate particles can be expanded by heat to form thin-walled bubbles that can be broken, neutralized, washed and dried to provide hydrated silica flakes. These flakes can be mixed with non-swelling sorptive particles such as TLC grade silica and used to make chromatographic articles. One such article is a composite of a poly(tetrafluoroethylene) fibril matrix in which those particles and hydrated or fired silica flakes are enmeshed. The hydrated silica flakes can be fired to a refractory state and then incorporated into protective coatings to enhance their resistance to abrasion while also better protecting the coated substrates from corrosion.

    摘要翻译： 水合硅酸钠颗粒可以通过加热来膨胀以形成可以破碎，中和，洗涤和干燥以提供水合二氧化硅薄片的薄壁气泡。 这些薄片可与非溶胀吸附颗粒如TLC级二氧化硅混合并用于制备色谱制品。 一种这样的制品是聚（四氟乙烯）原纤基质的复合材料，其中这些颗粒和水合或煅烧的二氧化硅薄片是啮合的。 水合二氧化硅薄片可以烧制到耐火状态，然后加入到保护涂层中，以增强其耐磨性，同时还能更好地保护涂覆的基材免受腐蚀。

    Method of manufacturing articles of extremely pure synthetic particulate silicon dioxide
    42.
    发明授权
    Method of manufacturing articles of extremely pure synthetic particulate silicon dioxide 失效
    制造极纯合成颗粒状二氧化硅制品的方法

    公开(公告)号：US4826521A

    公开(公告)日：1989-05-02

    申请号：US160726

    申请日：1988-02-26

    申请人： Uwe Wiechmann ,  Andreas Schultheis

    发明人： Uwe Wiechmann ,  Andreas Schultheis

    IPC分类号： C01B33/158 ,  C01B33/152 ,  C01B33/18 ,  C03B8/02 ,  C03B19/10 ,  C03B19/12 ,  C03B20/00 ,  C03B37/016 ,  C03C1/00 ,  C03B23/20 ,  C01B33/12 ,  C03C27/00 ,  C03C29/00

    CPC分类号： C03B19/1065 ,  C01B33/152 ,  C03C1/006 ,  Y10S65/901

    摘要： In the production of an article of extremely pure synthetic silicon dioxide, wherein silicon tetrachloride is mixed with water to effect hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processed into the desired article, the improvement which comprises employing a ratio of silicon tetrachloride to water so that the hydrolysis product is in the form of a gel, distilling by-product hydrochloric acid out of the gel, preliminarily drying the gel at 100.degree. to 1000.degree. C. to produce an initial product, milling the initial product into a fine granulate at room temperature, separating from the milled granulate a fraction with a particle size of about 40 to 1000 .mu.m, and drying the screened-out granulate fraction while slowly heating to no more than 1400.degree. C. to form the resulting dried particulate product that is further processed into the desired article. As a result, high quality bubble free articles are produced.

    摘要翻译： 在制造极纯合成二氧化硅的制品中，其中将四氯化硅与水混合以进行水解，所得水解产物被干燥，所得干燥的颗粒产物进一步加工成所需的制品，其改进包括采用 四氯化硅与水的比例使得水解产物为凝胶形式，将副产物盐酸从凝胶中蒸馏出来，在100-1000℃下预先干燥凝胶以产生初始产物，研磨 将初始产物在室温下成细颗粒，与研磨的颗粒分离出粒径为约40至1000μm的级分，并将筛分的颗粒级分干燥，同时缓慢加热至不超过1400℃至 形成所得到的干燥颗粒产物，其进一步加工成所需的制品。 结果，生产出高质量的无泡沫制品。