Silica sols, a process for the preparation of silica sols...

Details Silica sols, a process for the preparation of silica sols... Silica sols, a process for the preparation of silica sols...

C - Chemistry, Metallurgy

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C01B 33/143 (2006.01) C01B 33/149 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/63 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01) D21H 17/74 (1995.01)

Patent

CA 2141551

Silica sols with a high content of microgel and particles with a specific surface area within the range 300 to 700 m2/g, preferably 400 to 650 m2/g. The sols can be prepared by acidification of a water glass solution and alkalization at a certain dry content, alternatively to a certain pH. The sots are particularly suitable for use as additives in papermaking in combination with cationic polymers and especially in combination with cationic acrylamide based polymers.

On décrit des sols de silice à forte teneur en microgel et dotés de particules dont la surface spécifique varie entre 300 et 700 mais de préférence 400 et 650 m2/g. On peut préparer ces sols par acidification d'une solution de verre soluble et alcalinisation à une certaine teneur sèche ou à un certain pH. Ils se prêtent particulièrement à une utilisation comme additifs dans la fabrication du papier, en combinaison avec des polymères cationiques, et notamment ceux à base d'acrylamide.

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