Foundry binder

B - Operations – Transporting – 22 – C

Patent

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B22C 1/16 (2006.01) B22C 1/20 (2006.01) C03C 17/00 (2006.01) C04B 35/624 (2006.01) C04B 35/628 (2006.01) C04B 35/63 (2006.01) C09C 3/12 (2006.01) C09D 183/04 (2006.01)

Patent

CA 2271310

A foundry binder is obtained by surface modification of (a) colloidal inorganic particles with (b) one or several silanes of the general formula (I): Rx-Si-A4-x, in which the radicals A are the same or different and represent hydroxyl groups or hydrolytically splittable groups, except for methoxy, the radicals R are the same or different and represent non hydrolytically splittable groups and x equals 0, 1, 2 or 3, x1 in at least 50 % by volume of the silanes, in the conditions of a sol-gel process with a substoichiometric amount of water, in relation to the available hydrolysable groups, so as to form a nanocomposite sol. If required, the nanocomposite sol is further hydrolysed and condensed before being brought into contact with the foundry sand.

Le liant de fonderie décrit est obtenu par modification de la surface de (a) des particules inorganiques colloïdales avec (b) un ou plusieurs silanes de la formule générale (I): R¿x?-Si-A¿4-x?, dans laquelle les radicaux A sont identiques ou différents et représentent des groupes hydroxyles ou des groupes clivables par hydrolyse, à l'exception de méthoxy, les radicaux R sont identiques ou différents et représentent des groupes non clivables par hydrolyse et x vaut 0, 1, 2 ou 3, x?1 dans au moins 50 % en volume des silanes, dans des conditions d'un processus sol-gel avec une quantité sous-stoechiométrique d'eau, par rapport aux groupes hydrolysables disponibles, de façon à former un sol nanocomposite. Le sol nanocomposite est le cas échéant à nouveau hydrolysé et condensé avant d'être mis en contact avec le sable de fonderie.

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