Foundry binder

US6378599B1 · kind B1 · utility

Assignee

• Institut fuer Neue Materialien gemeinnuetzige GmbH · DE

Inventors

• Helmut Schmidt · Riegelsberg, DE
• Martin Mennig · Idar-Oberstein, DE
• Gerhard Jonschker · Friedrichsthal, DE

Key dates

• Filing date: May 3, 1999
• Grant date: Apr 30, 2002
• Expiry date: May 3, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2217/475
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A foundry binder is obtainable by surface modification ofa) colloidal inorganic particles withb) one or more silanes of the general formula (I)Rx—Si—A4−x  (I)where the radicals A are identical or different and are hydroxyl groups or groups which can be removed hydrolytically, except methoxy, the radicals R are identical or different and are groups which cannot be removed hydrolytically and x is 0, 1, 2 or 3, where x≧1 in at least 50 mol % of the silanes;under the conditions of the sol-gel process with a below-stoichiometric amount of water, based on the hydrolysable groups which are present, with formation of a nanocomposite sol, and further hydrolysis and condensation of the nanocomposite sol, if desired, before it is brought into contact with the foundry sand.