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    • 27. 发明授权
    • Precipitated silica
    • 沉淀二氧化硅
    • US06335396B1
    • 2002-01-01
    • US09551231
    • 2000-04-17
    • Yvonick ChevallierEvelyne Prat
    • Yvonick ChevallierEvelyne Prat
    • C01B3312
    • C08K3/36C01B33/193C01P2004/10C01P2004/20C01P2004/32C01P2004/50C01P2004/61C01P2006/11C01P2006/12C01P2006/14C01P2006/16C01P2006/17C08L21/00
    • Silicas in the form of powder and substantially spherical beads or granules are characterized by a CTAB specific surface of 140 and 240 m2/g a high ultrasonic disaggregation factor, an average diameter, which is small after ultrasonic disaggregation, and optionally, a porous distribution, the porous volume formed by the pores with a diameter of 175 to 275 Å being less than 50% of the porous volume formed by the pores with diameters of 400 Å or less. The silicas may be used as reinforcing fillers for elastomers. The invention also concerns a method for preparing precipitated silica of the type comprising the reaction of an alkaline metal silicate M with an acidifying agent, resulting in a suspension of precipitated silica, and the separation and drying of said suspension, wherein precipitation is performed as follows: (i) an initial seed is formed comprising a portion of the total quantity of alkaline metal silicate M in the reaction, the silicate concentration (expressed as SiO2) in said seed being less than 20 g/l; (ii) an acidifying agent is added to the initial seed until at least 5% of the quantity of M2O in the initial seed is neutralized; (iii) the acidifying agent and the remaining quantity of alkaline metal silicate M are added simultaneously so that the ratio of the quantity of added silicate (expressed as SiO2) to the quantity of silica in the initial seed (expressed as SiO2) is greater than 4 and at most 100.
    • 以粉末形式和基本上为球形的珠粒或颗粒形式的硅质的特征在于CTAB比表面积为140和240m 2 / ga的高超分解聚集因子,平均直径在超声解聚之后是小的,以及任选的多孔分布, 由直径为175至275的孔形成的多孔体积小于由直径为或以下的孔形成的多孔体积的50%。 二氧化硅可用作弹性体的增强填料。 本发明还涉及一种制备包括碱金属硅酸盐M与酸化剂反应的沉淀二氧化硅的方法,导致沉淀二氧化硅的悬浮液以及所述悬浮液的分离和干燥,其中沉淀如下进行 (i)在反应中形成包含总量的碱金属硅酸盐M的一部分的初始种子,所述种子中的硅酸盐浓度(以SiO 2表示)小于20g / l; (ii)将酸化剂加入到初始种子中,直到初始种子中至少5%的M 2 O被中和; (iii)同时添加酸化剂和剩余量的碱金属硅酸盐M,使得添加的硅酸盐的量(以SiO 2表示)与初始种子中的二氧化硅的量的比例(以SiO 2表示)大于 4和最多100。
    • 28. 发明授权
    • Precipitated silica
    • 沉淀二氧化硅
    • US06169135A
    • 2001-01-02
    • US08808681
    • 1997-02-28
    • Yvonick ChevallierEvelyne Prat
    • Yvonick ChevallierEvelyne Prat
    • C08K336
    • C01B33/193C01P2004/10C01P2004/20C01P2004/32C01P2004/50C01P2004/61C01P2006/11C01P2006/12C01P2006/14C01P2006/16C01P2006/17C08K3/36C08L21/00
    • Silicas in the form of powder and substantially spherical beads or granules are characterized by a CTAB specific surface of 140 and 240 m2/g a high ultrasonic disaggregation factor, an average diameter, which is small after ultrasonic disaggregation, and optionally, a porous distribution, the porous volume formed by the pores with a diameter of 175 to 275 Å being less than 50% of the porous volume formed by the pores with diameters of 400 Å or less. The silicas may be used as reinforcing fillers for elastomers. The invention also concerns a method for preparing precipitated silica of the type comprising the reaction of an alkaline metal silicate M with an acidifying agent, resulting in a suspension of precipitated silica, and the separation and drying of said suspension, wherein precipitation is performed as follows: (i) an initial seed is formed comprising a portion of the total quantity of alkaline metal silicate M in the reaction, the silicate concentration (expressed as SiO2) in said seed being less than 20 g/l; (ii) an acidifying agent is added to the initial seed until at least 5% of the quantity of M2O in the initial seed is neutralized; (iii) the acidifying agent and the remaining quantity of alkaline metal silicate M are added simultaneously so that the ratio of the quantity of added silicate (expressed as SiO2) to the quantity of silica in the initial seed (expressed as SiO2) is greater than 4 and at most 100.
    • 以粉末形式和基本上为球形的珠粒或颗粒形式的硅质的特征在于CTAB比表面积为140和240m 2 / ga的高超分解聚集因子,平均直径在超声解聚之后是小的,以及任选的多孔分布, 由直径为175至275的孔形成的多孔体积小于由直径为或以下的孔形成的多孔体积的50%。 二氧化硅可用作弹性体的增强填料。 本发明还涉及一种制备包括碱金属硅酸盐M与酸化剂反应的沉淀二氧化硅的方法,导致沉淀二氧化硅的悬浮液以及所述悬浮液的分离和干燥,其中沉淀如下进行 (i)在反应中形成包含总量的碱金属硅酸盐M的一部分的初始种子,所述种子中的硅酸盐浓度(以SiO 2表示)小于20g / l; (ii)将酸化剂加入到初始种子中,直到初始种子中至少5%的M 2 O被中和; (iii)同时添加酸化剂和剩余量的碱金属硅酸盐M,使得添加的硅酸盐的量(以SiO 2表示)与初始种子中的二氧化硅的量的比例(以SiO 2表示)大于 4和最多100。