Stable silica sols of high surface area and improved activity

Details Stable silica sols of high surface area and improved activity Stable silica sols of high surface area and improved activity

B - Operations, Transporting

01

J

B01J 13/00 (2006.01) C01B 33/143 (2006.01) D21H 21/10 (2006.01) D21H 17/29 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2375399

Disclosed are stable, aqueous colloidal silicas having surface area of greater than 700m2/g and S-values of from 20-50. These colloidal silicas do not require treatment with a surface treating agent such as aluminium to achieve stability. These colloidal silica aquasols can be produced and stored at concentrations greater than 7 percent by weight SiO2 solids, and even as high as 15 percent by weight solids or higher, and remain stable at room temperature for at least 30 days. These colloidal silica sols are useful as drainage and retention agents in papermaking processes. Also disclosed are processes for making aqueous colloidal silica of the invention and papermaking processes employing the colloidal silica sols.

L'invention concerne des silices colloïdales aqueuses stables présentant une aire de surface supérieure à 700 m<2>/g et des valeurs S de 20 à 50. Ces silices colloïdales ne nécessitent aucun traitement avec des agents de traitement de surface tels que l'aluminium pour obtenir une stabilité. Ces aquasols de silice colloïdale peuvent être produits et stockés à des concentrations supérieures à 7 % en poids de solides SiO2, et même jusqu'à 15 % en poids de solides ou davantage, et ils restent stables à température ambiante pendant au moins 30 jours. Ces sols de silice colloïdale sont utiles en tant qu'agents de drainage et de retenue dans des procédés de fabrication de papier. L'invention concerne également des procédés de fabrication de silice colloïdale aqueuse de l'invention ainsi que des procédés de fabrication de papier utilisant les sols de silice colloïdale.

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