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    • 21. 发明授权
    • Process for preparing organically modified aerogels in which the salts formed are precipitated out
    • 制备其中形成的盐的有机改性气凝胶的方法沉淀出来
    • US06210751B1
    • 2001-04-03
    • US09068371
    • 1998-08-24
    • Fritz Schwertfeger
    • Fritz Schwertfeger
    • B05D700
    • C01B33/1585C01B33/16C04B14/064
    • The present invention relates to a process for the preparation of organically modified aerogels, comprising a) the preparation of a silicic acid sol having a pH of ≦4.0 from an aqueous water glass solution, with the aid of at least one organic and/or inorganic acid; b) polycondensation of the resulting silicic acid sol to a SiO2 gel by the addition of a base; c) washing the gel obtained in Step b) with an organic solvent until the water content of the gel is ≦5% by weight; d) surface-silylating the gel obtained in Step c), and e) drying the surface-silylated gel obtained in Step d), characterized in that at least one acid forms difficultly soluble salts with the cations of the water glass in the silicic acid sol, and that before Step b) the resulting difficultly soluble salts are extensively precipitated and separated from the silicic acid sol.
    • 本发明涉及一种制备有机改性气凝胶的方法,该方法包括:a)通过至少一种有机和/或无机物从水性水玻璃溶液制备pH <= 4.0的硅酸溶胶 酸; b)通过加入碱将得到的硅酸溶胶缩聚成SiO 2凝胶; c)用有机溶剂洗涤步骤b)中得到的凝胶,直到凝胶的含水量<5重量% ; d)使步骤c)中获得的凝胶进行表面甲硅烷化,和e)干燥步骤d)中获得的表面甲硅烷基化凝胶,其特征在于至少一种酸与硅酸中水玻璃的阳离子形成难溶的盐 溶胶,步骤b)之前,所得难溶的盐被广泛沉淀并与硅酸溶胶分离。