Nanoscalar particles based on sio2 and mixed oxides thereof,...

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 33/193 (2006.01) C01B 33/26 (2006.01) D06M 11/45 (2006.01) D06M 11/79 (2006.01)

Patent

CA 2634300

Nanoscalar primary particles based on SiO2 or a mixed oxide of SiO2 and other metal oxides, in particular Al2O3, are disclosed. These particles have an average particle size ranging from 1 to 2000 nm (determined by the particle size measuring method that uses a Zetasizer NS (Nano Series)) and a negative charge, and can be advantageously used for producing a hydrophilic coating on textile materials. If required, a hydrophobic outer layer can be formed on the previously treated hydrophilic material, ensuring an enhanced alcohol and oil repelling effect, in comparison with a textile material without a hydrophilic intermediate layer. The nanoscalar primary particles can be used for this purpose in a particularly advantageous manner if they are added to the reaction solution in statu nascendi.

L'invention concerne des particules primaires, à l'échelle nanométrique, à base de SiO<SUB>2</SUB> ou d'un oxyde mixte de SiO<SUB>2</SUB> et d'autres oxydes métalliques, en particulier Al<SUB>2</SUB>O<SUB>3</SUB>. Ces particules présentent une granulométrie de 1 à 2000 nm (déterminée suivant le procédé de mesure granulométrique au moyen de l'appareil Zetasizer NS (série nano)), ainsi qu'une charge négative et peuvent être avantageusement utilisées pour la production d'un revêtement hydrophile sur des matériaux textiles. Si nécessaire, une couche externe hydrophobe peut être formée sur le matériau hydrophile préalablement traité, procurant un effet amélioré de répulsion d'alcool et d'huile, comparativement à un matériau textile fabriqué sans couche intermédiaire hydrophile. Les particules primaires nanométriques peuvent être avantageusement utilisées dans ce but en les ajoutant in statu nascendi à la solution réactionnelle.

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