Thermal insulating material based on pigment containing silica aerogels
    1.
    发明授权
    Thermal insulating material based on pigment containing silica aerogels 失效
    基于含有二氧化硅染色体的热绝缘材料

    公开(公告)号:US5122291A

    公开(公告)日:1992-06-16

    申请号:US519103

    申请日:1990-05-04

    摘要: A thermal insulating material based on a pigment-containing silica aerogel is obtainable bya) reacting an aqueous dispersion of sodium silicate and a pigment with a strong acid or sodium silicate with a pigment-containing strong acid to give a pigment-containing silica hydrogen, the pigment being such that it scatters, absorbs or reflects infrared radiation of wavelength 3-10 .mu.m,b) substantially freeing the resulting pigment-containing silica hydrogel from ionic constituents by washing with water,c) displacing the water in the hydrogen by a low-boiling liquid which is inert toward the pigment-containing silica gel,d) heating the liquid-containing silica gel thus obtained under supercritical conditions while completely covered with the liquid, ande) subsequently removing the liquid from the solid by flash vaporization at supercritical temperature.

    摘要翻译: 基于含颜料的二氧化硅气凝胶的绝热材料可通过以下步骤获得:a)使硅酸钠的水性分散体与颜料与强酸或硅酸钠与含颜料的强酸反应,得到含颜料的二氧化硅氢, 颜料使其散射,吸收或反射波长3-10μm的红外辐射,b)通过用水洗涤将所得的含颜料的二氧化硅水凝胶从离子组分中释放出来; c)将氢气中的水置于 对含颜料的硅胶呈惰性的低沸点液体,d)在超临界条件下加热含有该液体的硅胶,同时完全覆盖液体,e)随后通过闪蒸蒸发从固体中除去液体 超临界温度