EP 3225327 A1 20171004 - 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)
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)
Citation (applicant)
- US 4226277 A 19801007 - MATALON RALPH
- WO 9849118 A1 19981105 - CROSFIELD JOSEPH & SONS [GB], et al
- EP 1802409 A2 20070704 - LUENGEN GMBH & CO KG AS [DE]
- SCHIELE; SCHON: "Anorganische Binder zur Form- und Kernherstellung in der Giesserei", 2012, pages: 70
- "Giesserei Lexikon", 1986, FACHVERIAG SCHIELE & SCHON GMBH, pages: 1066
- DONALD W; D. SMITH: "Use of blast furnace slag cements as hardening agents for silicate-bonded moulding sands", January 1968, THE BRITISH FOUNDRYMAN, pages: 34 - 40
- D. WARREN: "Recent developments in the silicate-based foundry processes", December 1971, THE BRITISH FOUNDRYMAN, pages: 449 - 455
Citation (search report)
- [X] US 3210267 A 19651005 - PLANK CHARLES J, et al
- [A] WO 9526321 A1 19951005 - ASHLAND INC [US]
- [A] DE 1190610 B 19650408 - RUDOLF STOLLE DIPL ING
- [A] US 7022178 B1 20060404 - STEINHAEUSER THOMAS [DE]
- [A] US 2010224756 A1 20100909 - MULLER JENS [DE], et al
- [A] DD 82809 A1 19710620
- [A] CN 103157768 A 20130619 - NINGGUO DONGDU CASTING CO LTD
- [A] US 5743953 A 19980428 - TWARDOWSKA HELENA [US], et al
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
Designated extension state (EPC)
BA ME
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