Process for making hydrophobic silica with reduced surface area under
neutral conditions
    5.
    发明授权
    Process for making hydrophobic silica with reduced surface area under neutral conditions 失效
    在中性条件下制备表面积减小的疏水性二氧化硅的方法

    公开(公告)号:US5942590A

    公开(公告)日:1999-08-24

    申请号:US22282

    申请日:1998-02-11

    Abstract: The present invention is hydrophobic silica gels having a reduced surface area and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of a mixture comprising a silica hydrosol and colloidal silica is adjusted with a base to within a range of pH 3 to pH 6 to facilitate formation of a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica gel having a surface area within a range of about 100 m.sup.2 /g to 450 m.sup.2 /g in the dry state. In a preferred process the hydrophobic silica gel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel. A water soluble compound of cerium or iron may be added during conduct of the second step to improve heat stability of the hydrophobic silica gel.

    Abstract translation: 本发明是具有减小的表面积的疏水性硅胶和其在中性条件下制备的方法。 该方法包括两个步骤,其中在第一步骤中,将包含二氧化硅水溶胶和胶体二氧化硅的混合物的pH调节至碱在pH 3至pH 6的范围内,以促进形成掺入胶体二氧化硅的二氧化硅水凝胶 。 在第二步骤中,二氧化硅水凝胶在催化量的强酸存在下与有机硅化合物接触,以实现二氧化硅水凝胶的疏水化,从而形成表面积在约100m 2 / g范围内的疏水性硅胶 在干燥状态下为450m2 / g。 在优选的方法中,将疏水性硅胶与足够量的与水不混溶的有机溶剂接触以将疏水性二氧化硅水凝胶转化成疏水性二氧化硅有机凝胶。 在第二步进行时可以加入铈或铁的水溶性化合物,以提高疏水硅胶的热稳定性。

    Method for preparing hydrophilic silica gels with high pore volume
    6.
    发明授权
    Method for preparing hydrophilic silica gels with high pore volume 有权
    制备高孔体积的亲水硅胶的方法

    公开(公告)号:US06239243B1

    公开(公告)日:2001-05-29

    申请号:US09329384

    申请日:1999-06-10

    CPC classification number: C01B33/16 Y10T428/2995

    Abstract: A method for the preparation of hydrophilic silica gels with high pore volume. In the preferred method a hydrophilic silica hydrogel treated with an organosilicon compound to effect hydrophobing of the silica hydrogel is heated in the presence of an oxidizing atmosphere to a temperature sufficient to reduce the hydrophobicity imparted by the surface treatment thereby producing a hydrophilic silica gel having high pore volume.

    Abstract translation: 一种制备高孔体积的亲水硅胶的方法。 在优选的方法中,用有机硅化合物处理以实现二氧化硅水凝胶的疏水化的亲水性二氧化硅水凝胶在氧化气氛的存在下加热到足以降低由表面处理赋予的疏水性的温度,从而产生具有高的亲水性硅胶 孔体积。

    Neutral-aged hydrophobic silica gels with reduced surface area
    7.
    发明授权
    Neutral-aged hydrophobic silica gels with reduced surface area 失效
    中性疏水硅胶,表面积减小

    公开(公告)号:US6107351A

    公开(公告)日:2000-08-22

    申请号:US28038

    申请日:1998-02-23

    Abstract: The present invention is neutral-aged hydrophobic silica gels having a reduced surface area and a method for their preparation. The method comprises three steps, where in the first step a mixture comprising a silica hydrosol and colloidal silica is contacted with a strong mineral acid at a pH less than about 1 to form a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the third step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica hydrogel having a surface area within a range of about 100 m.sup.2 /g to 450 m.sup.2 /g in the dry state. In a preferred method the hydrophobic silica hydrogel and is further contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

    Abstract translation: 本发明是具有减小的表面积的中性疏水性硅胶,及其制备方法。 该方法包括三个步骤,其中在第一步骤中,将包含二氧化硅水溶胶和胶体二氧化硅的混合物与pH值小于约1的强无机酸接触以形成掺入胶体二氧化硅的二氧化硅水凝胶。 在第二步中,将二氧化硅水凝胶在约3.5至约8的pH范围内老化。在第三步中,在催化量的强酸存在下,使二氧化硅水凝胶与有机硅化合物接触以进行疏水 的二氧化硅水凝胶以形成在干燥状态下表面积在约100m 2 / g至450m 2 / g范围内的疏水性二氧化硅水凝胶。 在优选的方法中,疏水性二氧化硅水凝胶进一步与足够量的与水不混溶的有机溶剂接触以将疏水性二氧化硅水凝胶转化成疏水性二氧化硅有机凝胶。

    RTV silicone compositions with rapid development of green strength
    8.
    发明授权
    RTV silicone compositions with rapid development of green strength 失效
    RTV硅胶组合物具有绿色强度的快速发展

    公开(公告)号:US06235832B1

    公开(公告)日:2001-05-22

    申请号:US09456423

    申请日:1999-12-08

    Abstract: A room temperature vulcanizing (RTV) silicone composition curable in the presence of moisture with rapid development of green strength. The RTV silicone composition comprises (A) 0 to about 85 weight percent polydiorganosiloxanes comprising on average at least 1.2 chain terminations per molecule selected from the group consisting of hydroxysilyl groups and alkoxysilyl groups; (B) about 10 to 95 weight percent polydiorganosiloxanes comprising on average at least 1.2 chain terminations per molecule selected from the group consisting of hydroxysilyl groups, alkoxysilyl groups, and multi-alkoxysilyl groups, provided that at least one chain termination per molecule comprises a multi-alkoxysilyl group; (C) an effective amount of a condensation catalyst; (D) 0 to about 40 weight percent of an alkoxysilane; and (E) 0 to about 60 weight percent of a filler; provided that the sum of the weight percents of Components (A) and (B) comprises about 20 to 95 weight percent based on the total weight of the RTV silicone composition.

    Abstract translation: 室温硫化(RTV)硅氧烷组合物在水分存在下固化,具有绿色强度的快速发展。 RTV硅氧烷组合物包含(A)0至约85重量%的聚二有机硅氧烷,其每分子平均含有至少1.2个链端,其选自羟基甲硅烷基和烷氧基甲硅烷基; (B)约10至95重量%的聚二有机硅氧烷,其每分子平均含有至少1.2个分子链,其选自羟基甲硅烷基,烷氧基甲硅烷基和多烷氧基甲硅烷基,条件是每分子至少一个链终止包括多 - 烷氧基甲硅烷基 (C)有效量的缩合催化剂; (D)0〜约40重量%的烷氧基硅烷; 和(E)0至约60重量%的填料; 只要组分(A)和(B)的重量百分比的总和相对于RTV硅氧烷组合物的总重量为约20至95重量%。

    Neutral-aged hydrophobic organosilicate-modified silica gels
    9.
    发明授权
    Neutral-aged hydrophobic organosilicate-modified silica gels 失效
    中性疏水性有机硅酸酯改性硅胶

    公开(公告)号:US5807501A

    公开(公告)日:1998-09-15

    申请号:US801410

    申请日:1997-02-20

    Abstract: The present invention is neutral-aged hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises three steps, where in the first step an organosilicate-modified silica hydrosol is contacted with a strong mineral acid at a pH less than about 1 to form an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the third step the neutral-aged organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of about 100 m.sup.2 /g to 750 m.sup.2 /g in the dry state. In a preferred process the hydrophobic organosilicate-modified silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic organosilicate-modified silica hydrogel into a hydrophobic organosilicate-modified silica organogel.

    Abstract translation: 本发明是中性老化的疏水性有机硅酸酯改性硅胶及其制备方法。 该方法包括三个步骤,其中在第一步中,将有机硅酸酯改性的二氧化硅水溶胶与pH值小于约1的强无机酸接触以形成有机硅酸酯改性的二氧化硅水凝胶。 在第二步中,将有机硅酸酯改性的二氧化硅水凝胶在pH值约为3.5至pH8的范围内老化。在第三步中,将中性有机硅酸酯改性的二氧化硅水凝胶与有机硅化合物在 催化量的强酸以实现有机硅酸酯改性二氧化硅水凝胶的疏水化,从而形成疏水性有机硅酸酯改性二氧化硅水凝胶,其在干燥状态下的表面积为约100m 2 / g至750m 2 / g。 在优选的方法中,将疏水性有机硅酸酯改性的二氧化硅水凝胶与足够量的与水不混溶的有机溶剂接触以将疏水性有机硅酸酯改性的二氧化硅水凝胶转化成疏水性有机硅酸酯改性的二氧化硅有机凝胶。

    Method for making hydrophobic silica gels under neutral conditions
    10.
    发明授权
    Method for making hydrophobic silica gels under neutral conditions 失效
    在中性条件下制备疏水性硅胶的方法

    公开(公告)号:US5708069A

    公开(公告)日:1998-01-13

    申请号:US805398

    申请日:1997-02-24

    CPC classification number: C08K9/06 Y10T428/2962 Y10T428/2995

    Abstract: The present invention is hydrophobic silica gels and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of a silica hydrosol is adjusted with a base to within a range of about pH 3 to pH 7 to facilitate formation of a silica hydrogel. In the second step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel. In a preferred method, in a third step the hydrophobic silica gel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

    Abstract translation: 本发明是疏水性硅胶及其在中性条件下制备的方法。 该方法包括两个步骤,其中在第一步骤中,将二氧化硅水溶胶的pH用碱调节至约pH 3至pH 7的范围内以促进二氧化硅水凝胶的形成。 在第二步中,二氧化硅水凝胶在催化量的强酸存在下与有机硅化合物接触,以实现二氧化硅水凝胶的疏水。 在优选的方法中,在第三步骤中,将疏水性硅胶与足够量的与水不混溶的有机溶剂接触以将疏水性二氧化硅水凝胶转化成疏水性二氧化硅有机凝胶。

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