EP 3225327 B1 20201216 - AN INORGANIC BINDER SYSTEM FOR FOUNDRIES
Title (en)
AN INORGANIC BINDER SYSTEM FOR FOUNDRIES
Title (de)
ANORGANISCHES BINDEMITTELSYSTEM FÜR GIESSEREIEN
Title (fr)
SYSTÈME DE LIANT INORGANIQUE POUR FONDERIES
Publication
Application
Priority
IT UA20162227 A 20160401
Abstract (en)
[origin: EP3225327A1] The present invention relates to a powder composition that acts as an activator in foundry binder systems comprising an aqueous solution of sodium silicate. The powder composition of the invention comprises sodium silicate having CAS Registry Number 1344-09-8 and a SiO 2 /Na 2 O molar ratio comprised between 3.0 and 3.6, preferably between 3.2 and 3.5, sodium aluminosilicate having CAS Registry Number 1344-00-9, and, optionally, additives. The invention furthermore claims binder systems comprising the powder composition of the invention and aqueous solutions of sodium silicate, optionally comprising additives, the use of said binder systems for the production of foundry moulds, such as cores and/or moulds, and likewise the moulding material mixtures for the production of foundry cores and/or moulds comprising the binder systems of the invention and silica sand and/or other granular refractory material. Furthermore, objects of the invention are a process for the production of said foundry cores and/or moulds, comprising a production step of the moulding material mixtures comprising the binder systems of the invention, together with silica sand and/or other granular refractory material, and a heating step of said moulding material mixtures, and the cores and/or moulds obtainable with said process.
IPC 8 full level
CPC (source: EP)
B22C 1/188 (2013.01)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3225327 A1 20171004; EP 3225327 B1 20201216; IT UA20162227 A1 20171001
DOCDB simple family (application)
EP 17163617 A 20170329; IT UA20162227 A 20160401