Method for making a highly exfoliated vermiculite without...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 14/20 (2006.01)

Patent

CA 2687645

The invention relates to a method for preparing an exfoliated vermiculite that comprises the following steps: the step of heating a hydrated non-exfoliated vermiculite at a temperature of between 400 and 600°C for a duration of 3 to 7 hours, thus generating a dehydrated vermiculite; the step of contacting the dehydrated vermiculite with a solution containing an interleaving agent degradation with gas release. The invention can be used in the field of thermal insulation.

L' invention a trait à un procédé de préparation d'une vermiculite exfoliée comprenant les étapes suivantes : - une étape de chauffage d'une vermiculite hydratée non exfoliée à une température allant de 400 à 600°C pendant une durée allant de 3 heures à 7 heures, générant ainsi une vermiculite déshydratée; - une étape de mise en contact de la vermiculite déshydratée avec une solution comprenant un agent d'intercalation apte à se dégrader en générant des gaz. Application dans le domaine de l'isolation thermique.

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