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    • 43. 发明授权
    • Method for the preparation of ultra-fine hollow glass spheres
    • 超细中空玻璃球的制备方法
    • US5017523A
    • 1991-05-21
    • US491427
    • 1990-03-09
    • Kunio KimuraKazuhiko JinnaiHiroshi Tateyama
    • Kunio KimuraKazuhiko JinnaiHiroshi Tateyama
    • C03C12/00C03B19/08C03B19/10C03C11/00C04B14/24
    • C04B14/24C03B19/107C03C11/002Y02P40/57
    • Ultra-fine hollow glass spheres suitable as a filler in light-weight composite materials for building use and the like can be prepared from a fine powder of volcanic glass even when the starting powder has a particle size as fine as 20 .mu.m or smaller. The inventive method comprises an acid-leaching treatment of the starting powder using hydrochloric or sulfuric acid under hydrothermal conditions at 150.degree.-200.degree. C. to modify the chemical composition in the surface layer of the particles and a subsequent heat treatment of the acid-treated particles at a specified high temperature to effect expansion by the water vapor produced from the structural water in the softened particles. By virtue of the modified composition in the surface layer and in contrast to the prior art method without the acid treatment, a good balance can be obtained between the rate of water vapor release and softening of the particles even when the particle size is extremely small to facilitate expansion of the particles.
    • 即使起始粉末的粒径为20μm以下,也可以由火山玻璃的微细粉末制备适合作为建筑用轻质复合材料的填料的超细中空玻璃球。 本发明的方法包括在150-2200℃的水热条件下使用盐酸或硫酸对起始粉末进行酸浸处理,以改变颗粒表层的化学组成,随后热处理酸 - 在特定的高温下处理的颗粒通过由软化的颗粒中的结构水产生的水蒸汽进行膨胀。 由于表面层中的改性组合物,与不进行酸处理的现有技术方法形成对照,即使在粒径非常小的情况下,也可以获得水蒸气释放速率和颗粒软化之间的良好平衡 有助于颗粒的膨胀。