Method for preparing layered nanoparticles, and...

Details Method for preparing layered nanoparticles, and... Method for preparing layered nanoparticles, and...

C - Chemistry, Metallurgy

09

C

C09C 1/42 (2006.01) C09C 1/00 (2006.01) C09C 3/12 (2006.01)

Patent

CA 2634227

The invention relates to a method for preparing layered nanoparticles, said method comprising the following steps: a) a layered material is mixed with an expansion agent selected from the polyols, b) the expanded layered material is reacted with a grafting agent in the presence of water and an acid, said agent corresponding to general formula R<SUB>a</SUB>XY-<SUB>4-a </SUB>wherein R represents a hydrogen atom or a hydrocarbonated radical containing between 1 and 40 carbon atoms, the radicals R being identical or different, X represents a silicon, zirconium or titanium atom, Y is an alkoxy radical containing between 1 and 12 carbon atoms, or a halogen, and a is equal to 1, 2 or 3, and c) layered nanoparticles are recovered. The nanoparticles obtained are especially used for the reinforcement of polymers.

La présente invention se rapporte à un procédé de préparation de nanoparticules en feuillets, ledit procédé comprenant les étapes suivantes consistant à: a) mélanger un matériau feuilleté avec un agent d'expansion choisi parmi les polyols, b) faire réagir le matériau feuilleté expansé avec un agent de greffage en présence d'eau et d'un acide, ledit agent répondant à la formule générale RaXY4-a dans laquelle R représente un atome d'hydrogène ou un radical hydrocarboné renfermant 1 à 40 atomes de carbone, les groupements R pouvant être indentiques ou différents, X représente un atome de silicium, de zirconium ou de titane, Y est un groupe alkoxy contenant 1 à 12 atomes de carbone, ou un halogène, et a est égal à 1, 2 ou 3, c) et récupérer nanoparticules en feuillets. Les nanoparticules obtenues sont destinées notamment au renforcement de polymères.

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