Abstract:
Molded, or pressed articles on pyrogenically produced zirconium dioxide are disclosed and having the following features:______________________________________ outside diameter 2-15 mm BET surface area per DIN 66 131 30-50 m.sup.2 /g total pore volume 0.3-0.8 ml/g pore size distribution no pores
Abstract translation:公开了在热解制备的二氧化锆上的成型或压制制品,具有以下特点: - 外径2-15mm -BET表面积/ DIN 66 131 30-50m2 / g-总孔体积0.3-0.8ml / g - 孔径分布无孔<10nm,在-10-70nm直径范围内至少80%的孔隙 - 冲击强度40-300N-组成至少98%的ZrO 2,SiO 2,剩余的Al 2 O 3和 /或 - HfO 2。 - 这些模塑制品通过在80至120℃的温度下干燥该混合物,通过在加入水的同时,将任何一种高岭土,糖或尿素或混合物中的热解产生的二氧化锆均质化,然后粉碎 成为易碎粉末,然后将其压制成模制品,随后在600℃至1000℃退火1至4小时。压制制品用作催化剂或作为催化剂载体。
Abstract:
There is produced a hydrophobic mixture for RTV and LTV silicone rubber by applying a hydrophobizing agent to a precipitated silica, homogeneously mixing this powdery concentrate into a pyrogenically produced silica, tempering the mixture and mechanically compacting. The hydrophobic filler mixture obtained in the untempered condition consists of:Pyrogenically produced silica: 50 to 85 weight %Precipitated silica: 5 to 40 weight % (e.g. 5 to 30 weight %)Hydrophobization agent: 8 to 30 weight %Aluminum oxide: 0.5 to 5 weight %.
Abstract:
Functionalized, structurally modified silicas with 3-methacryloxypropylsilyl and/or glycidyloxypropylsilyl groups on the surface are prepared by mixing the silicas with the silane and heat-treating, destructuring and grinding the mixture. The silicas are employed in radiation-curing coatings.
Abstract:
Silanized, structurally modified, pyrogenically produced silicas, characterised by groups fixed to the surface, wherein the groups are dimethylsilyl and/or monomethylsilyl, are produced in that pyrogenically produced silica is treated by a known method with dimethyldichorosilane and/or monomethyltrichlorosilane, the groups dimethylsilyl and/or monomethylsilyl being fixed on the surface of the pyrogenic silica, and is then structurally modified and optionally post-ground. They are used to improve scratch resistance in lacquers.
Abstract:
The silanized, pyrogenically prepared silicic acids which are not dispersed in a solvent are prepared by treating pyrogenically prepared silicic acids with an organosilane selected from the group (RO).sub.3 SiC.sub.n H.sub.2n+1, in which n--from 10 to 18 and R stands for an alkyl.
Abstract translation:不分散在溶剂中的硅烷化的热解法制备的硅酸通过用选自以下的有机硅烷处理热解法制备的硅酸来制备:(RO)3SiCnH 2 n + 1,其中n为10至18,R代表烷基 。
Abstract:
The utilization of ethoxylated polyethyleneamines for addition to aqueous dispersions of pyrogenically prepared silicon dioxide in order to obtain an increase of the thickening action thereof.
Abstract:
A surface-modified, aerogel-type, structured silica is produced by spraying an aerogel-type, structured silica with a silanizing agent, post-mixing and conditioning. It can be used as a flatting agent.
Abstract:
Functionalized silicas with 3-methacryloxypropylsilyl and/or glycidyloxypropylsilyl groups on the surface are prepared by mixing the silicas with the silane and heat-treating the mixture. The silicas are employed, for example, in solvent-containing coatings.
Abstract:
The silanized, pyrogenically prepared silicic acids are prepared by treating pyrogenically prepared silicic acids with an organosilane selected from the group (RO).sub.3 SiC.sub.n H.sub.2n+1, in which n--from 10 to 18 and R stands for an alkyl.
Abstract translation:硅烷化的热解法制备的硅酸通过用选自(RO)3 SiCnH 2 n + 1的有机硅烷处理热解制备的硅酸来制备,其中n为10至18,R为烷基。