摘要:
Surface-modified, pyrogenically prepared silica is prepared by subjecting the pyrogenically prepared silica, which is in the form of aggregates of primary particles having a BET surface area of 300±25 m2/g and the aggregates have an average area of 4800-6000 nm2, an average equivalent circle diameter (ECD) of 60-80 nm and an average circumference of 580-750 nm, to surface-modification in a known way.It can be used as a filler for controlling the rheology of liquid silicone rubber (LSR) systems.
摘要:
The present invention relates to a hydrophobic, fumed silica which is obtained by reacting fumed silicas with cyclic polysiloxanes of the type —[O—SiR2]n—, where R is a C1 to C6 alkyl group and n is 3 to 9, and subsequently milling the silanized silicas obtained, and to a process for the preparation of the silica according to the invention, and to silicone rubber materials containing the silica according to the invention.
摘要翻译:本发明涉及一种疏水性热解法二氧化硅,其通过使热解法二氧化硅与[O-SiR 2] n - 型环状聚硅氧烷反应而获得,其中R是C1至C6烷基,n为3至9,随后 研磨所获得的硅烷化二氧化硅,以及制备本发明二氧化硅的方法和含有本发明二氧化硅的硅橡胶材料。
摘要:
Hydrophobic pyrogenic silica doped with potassium by means of aerosol is prepared by reacting a pyrogenic silica doped with potassium by means of aerosol with a surface-modifying agent. It can be used as a filler in silicone rubber.
摘要:
Alkali metal oxide-metal oxide mixed oxide powder in the form of aggregates of pore-free primary particles, comprising from 0.005 to 5% by weight of at least one alkali metal oxide, which has a BET surface area of from 100 to 350 m2/g, has a specific DBP number, expressed as DBP number per square meter of specific surface area, greater than or equal to that of a powder which has only the metal oxide component, has the alkali metal oxide distributed in the core and on the surface of the primary particles. Silicone rubber comprising the alkali metal oxide-metal oxide mixed oxide powder.
摘要:
Fumed silicon dioxide powder in the form of aggregated primary particles having a BET surface area of 175±15 m2/g and a thickening effect, based on the BET surface area, of greater than 18 mPas g/m2 is hydrophobicized with polydimethylsiloxane. This hydrophobic fumed silica has a BET surface area of 110±25 m2/g. It can be used in epoxy resins. These epoxy resins in turn can be used as adhesives.
摘要翻译:BET表面积为175±15m2 / g的聚合一次粒子形式的热解二氧化硅粉末和基于BET表面积的大于18mPas g / m 2的增稠效果用聚二甲基硅氧烷疏水化。 该疏水性热解法二氧化硅的BET表面积为110±25m 2 / g。 可用于环氧树脂。 这些环氧树脂又可以用作粘合剂。
摘要:
RTV two-component silicone rubber which contains structurally modified hydrophobic fumed silicas which have vinyl groups fixed on the surface, further hydrophobic groups, such as trimethylsilyl and/or dimethylsilyl and/or monomethylsilyl groups, additionally being fixed on the surface.
摘要:
Silanized, structurally modified silicas, characterised by vinyl groups or vinyl silyl groups fixed to the surface, hydrophobic groups such as trimethyl silyl and/or dimethyl silyl and/or monomethyl silyl additionally being fixed to the surface, having the following physico-chemical properties: BET surface area m2/g: 25-400 Average primary particle size nm: 5-50 pH: 3-10 Carbon content %: 0.1-10 DBP value %:
摘要:
The invention provides structurally modified, pyrogenically prepared silicas obtained by reaction of pyrogenic silicas with cyclic polysiloxanes of the type —[O—Si(R2)]n—, where R is a C1 to C6 alkyl group and n is 3 to 9, and subsequent structural modification of the silanized silicas obtained. The invention further provides an adhesive comprising the structurally modified, pyrogenically prepared silicas.
摘要翻译:本发明提供通过热解二氧化硅与[O-Si(R 2)] n - 型环状聚硅氧烷(其中R是C1至C6烷基,n为3至9)反应获得的结构上改性的热解法制备的二氧化硅,以及 随后对所得硅烷化二氧化硅的结构改性。 本发明还提供一种包含结构改性的,热解法制备的二氧化硅的粘合剂。