EP0150745B1 - Bindemittelgemisch zur Verfestigung - Google Patents

Bindemittelgemisch zur Verfestigung Download PDF

Info

Publication number
EP0150745B1
EP0150745B1 EP85100275A EP85100275A EP0150745B1 EP 0150745 B1 EP0150745 B1 EP 0150745B1 EP 85100275 A EP85100275 A EP 85100275A EP 85100275 A EP85100275 A EP 85100275A EP 0150745 B1 EP0150745 B1 EP 0150745B1
Authority
EP
European Patent Office
Prior art keywords
binder
sand
sodium silicate
added
hygroscopic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85100275A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0150745A2 (de
EP0150745A3 (en
Inventor
Thomas A. Cobett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bi-Tec Gesellschaft fur Bindemittel-Technolo GmbH
Original Assignee
Bi-Tec Gesellschaft fur Bindemittel-Technologie GmbH
Bi-Vt Bindemittel-Verfahrens-Technik fur Giessereien GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6226549&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0150745(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bi-Tec Gesellschaft fur Bindemittel-Technologie GmbH, Bi-Vt Bindemittel-Verfahrens-Technik fur Giessereien GmbH filed Critical Bi-Tec Gesellschaft fur Bindemittel-Technologie GmbH
Priority to AT85100275T priority Critical patent/ATE61258T1/de
Publication of EP0150745A2 publication Critical patent/EP0150745A2/de
Publication of EP0150745A3 publication Critical patent/EP0150745A3/de
Application granted granted Critical
Publication of EP0150745B1 publication Critical patent/EP0150745B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/167—Mixtures of inorganic and organic binding agents

Definitions

  • the invention relates to a binder mixture for solidifying the molding sand for foundry purposes, according to the first part of patent claim 1.
  • Patent document GB-A-1087767 discloses a mixture of aqueous sodium silicate solution with dry hygroscopic glucose, calcium carbonate and iron oxide.
  • polysaccharides which contain an anhydro-glucose unit, to the heat escaping during the casting process.
  • suitable polysaccharides for this beet or. Cane sugar or dextrin (broken down starch) are called, which are supposed to form raw materials for the in situ production of hygroscopical glucose.
  • a known binder composition (DE-A-2641249) of the type mentioned at the outset is intended to address the problem of creating sodium silicate binder compositions for the production of casting molds and cores which remain stable for three months or more when stored. It is recognized that when reducing cane sugar is used as a decay additive, strong hygroscopic behavior arises, which is disadvantageous for molds and cores in a moist atmosphere. To remedy this, an aqueous solution of a sodium silicate which contains a starch hydrolyzate with a dextrose equivalent of less than five is proposed as the binder composition. Catalytic hydrogenation with hydrogen is recommended as the preferred method for obtaining starch hydrolysates with such a low dextrose equivalent.
  • Hydrogenated starch hydrolyzate syrups with a dextrose equivalent of at most 0.01 are used as practical exemplary embodiments.
  • a chemical hardening agent namely esters of a polyhydric alcohol, is specified. So it becomes a binder consisting of a few Components taught, namely from an aqueous alkali silicate solution and a liquid starch hydrolyzate syrup with a dextrose equivalent, which should be dimensioned as low as possible.
  • a polyhydric alcohol, a non-hygroscopic starch hydrolyzate with a reducing power of 6-15%, non-hygroscopic starch, iron oxide and a lubricant are proposed as further additives in a binder mixture with the features mentioned in the preamble of claim 1.
  • the non-hygroscopic starch and the iron oxide being added in powder form and in an amount of 0.25 to 1% by weight of sand.
  • the non-hygroscopic starch and the iron oxide are added to the sand when this binder mixture is used according to the invention for the production of foundry molds before the addition of the sodium silicate and the modified carbohydrate.
  • the actual binder burns at about 200 ° C during the casting process.
  • the casting molds made from sand and the binder mixture according to the invention are absolutely resistant to the effects of moisture.
  • the sodium silicate and the modified carbohydrate are main components and have the following characteristic properties of this binder system: It is characterized by a low viscosity and a moisture resistance due to these components. This system also exhibits complete chemical reactions with the gelling reagents and increased reaction rates over the unmodified ones Sodium silicate binder systems. Another difference compared to the unmodified sodium silicate binder systems lies in the lower freezing point and an increased elasticity of the bonds between the grains of sand after the gelling process. This system is also characterized by a reduced catalyst consumption.
  • the modified carbohydrate is a non-hygroscopic starch hydrolyzate with a reducing power of 6-15%, which can also be added as a powder with -100 mesh to -200 mesh.
  • a lubricant for example in powder form, is added in an amount of 1 to 2% by weight of the amount of sand or else as an oil in an amount of 0.10-0.25% by weight of the amount of sand becomes.
  • the flowability of the sand mixture is improved by the addition of this lubricant.
  • the non-hygroscopic starch, the metal oxide and the lubricant bring about an increase in the tensile strength of the binder of almost 25% in the binder system according to the invention. This characteristic property can be improved by using CO2 or a chemical catalyst. Due to rapid drying, the mixture according to the invention shows high strength within a short time. It is also noteworthy that the set sand forms to achieve a Dehydration does not need to be oven dried or burned. This advantage is reflected in a large saving in energy and labor and thus in manufacturing costs.
  • ester compounds from a polyhydric alcohol and organic acids are used as catalysts.
  • the following acids have proven to be particularly suitable: acetic acid, carbonic acid, citric acid, glutaric acid and succinic acid. These different esters are mixed in different amounts and combinations.
  • the type and amount of the catalyst influence the production time of the molds, which can range from 2 minutes to several hours.
  • any sand customary in foundry technology such as e.g. Zircon, chromite, olivine, and silicate can be used.
  • the proportion of molding sand is approximately 96.5%, that of sodium silicate solution 3%, that of starch and metal oxide 0.5% and that of the lubricant up to 0.25%. If a catalyst is used, it is added in an amount of approximately 0.3%.
  • the ratio of the preparation time to the curing time is 1: 2.
  • the casting molds produced with the binder mixture according to the invention and the method according to the invention have a long shelf life, which amounts to approximately 30 days, with no special requirements being placed on the storage of the finished foundry molds.
  • the binder burns at about 200 ° C during the casting process, whereby the sand structure becomes loose and crumbles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Reinforced Plastic Materials (AREA)
EP85100275A 1984-02-02 1985-01-12 Bindemittelgemisch zur Verfestigung Expired - Lifetime EP0150745B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100275T ATE61258T1 (de) 1984-02-02 1985-01-12 Bindemittelgemisch zur verfestigung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843403583 DE3403583A1 (de) 1984-02-02 1984-02-02 Bindemittelgemisch zur verfestigung
DE3403583 1984-02-02

Publications (3)

Publication Number Publication Date
EP0150745A2 EP0150745A2 (de) 1985-08-07
EP0150745A3 EP0150745A3 (en) 1986-11-26
EP0150745B1 true EP0150745B1 (de) 1991-03-06

Family

ID=6226549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100275A Expired - Lifetime EP0150745B1 (de) 1984-02-02 1985-01-12 Bindemittelgemisch zur Verfestigung

Country Status (4)

Country Link
EP (1) EP0150745B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) ATE61258T1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DD (1) DD233959A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3403583A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02165840A (ja) * 1988-12-20 1990-06-26 M D Kasei Kk 鋳物用砂型の鋳型材料および鋳物用砂型の製造方法
EA015239B1 (ru) 2006-10-19 2011-06-30 Ашланд-Зюдхеми-Кернфест Гмбх Формовочная смесь, содержащая углеводы
DE102006061876A1 (de) * 2006-12-28 2008-07-03 Ashland-Südchemie-Kernfest GmbH Kohlenhydrathaltige Formstoffmischung
CN105983645A (zh) * 2015-12-31 2016-10-05 安徽创奇乐智能游乐设备有限公司 一种铸钢件用高耐火低膨胀型砂及其制备方法
JP7109444B2 (ja) * 2017-08-03 2022-07-29 旭有機材株式会社 鋳型材料及びその製造方法、鋳型の製造方法、並びに回収耐火性骨材の再生方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH321200A (de) * 1952-07-09 1957-04-30 Schmidt Wilhelm Verfahren zur Herstellung von Formen oder Kernen für Giessereizwecke
LU34695A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1955-10-14
DE1242800B (de) * 1964-04-06 1967-06-22 Harvest Queen Mill & Elevator Formbindemittel
GB1087767A (en) * 1965-01-29 1967-10-18 British Non Ferrous Metals Res Improvements in and relating to foundry moulding sand compositions
AU2236370A (en) * 1969-11-17 1972-05-18 Minerals, Binders, Clays (Proprietary) Limited Improvements in the co2 process for bonding, moulding and core sands in foundries
DE2156048A1 (de) * 1971-11-11 1973-05-17 Woellner Werke Verfahren zur herstellung von formen und kernen fuer den metallguss
US4070196A (en) * 1975-09-15 1978-01-24 Foseco International Limited Binder compositions
FR2348771A1 (fr) * 1976-04-21 1977-11-18 Roquette Freres Nouvel agent de debourrage pour moules et noyaux de fonderie a base de sable aux silicates
DE2946500A1 (de) * 1979-11-17 1981-05-27 Henkel KGaA, 4000 Düsseldorf Bindemittel auf basis von alkalimetallsilikatloesungen und deren verwendung

Also Published As

Publication number Publication date
ATE61258T1 (de) 1991-03-15
DE3403583C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1987-12-17
EP0150745A2 (de) 1985-08-07
DE3403583A1 (de) 1985-08-08
EP0150745A3 (en) 1986-11-26
DD233959A5 (de) 1986-03-19

Similar Documents

Publication Publication Date Title
DE2641249B2 (de) Lagerbeständiges Bindemittel zur Herstellung von Gießformen und - kernen
EP0771599A1 (de) Bindemittelsystem auf Polyurethan-Basis für Formstoff-Mischungen zur Herstellung von Giessformen und Kernen
DE2951502C2 (de) Gießereisandmischung
DE2316523B2 (de) Verfahren zur Herstellung von abgebundenem feinteiligem feuerfestem Material und ein dafür verwendetes Härtungsmittel
EP0150745B1 (de) Bindemittelgemisch zur Verfestigung
EP0804980B1 (de) Speisereinsätze und deren Herstellung
DE1508634A1 (de) Bindemittel fuer selbsthaertende Giessformen
DE3506132C2 (de) Lichtdurchlässige Festkörperbrandschutzmasse
EP1940987A2 (de) Kleber auf ligninbasis
DE2629667A1 (de) Mittel zur erleichterung des loesens von giessereirohlingen
DE3120241C2 (de) Ungebrannte Farbminen oder -kreiden und Verfahren zu deren Herstellung
DE629513C (de) Verfahren zur Herstellung einer porzellanartigen, kalt bindenden Pulvermasse
DE2815753A1 (de) Verfahren zur herstellung einer giessform bzw. eines gusskerns
AT133521B (de) Verfahren zur Herstellung von harten und elastischen Massen aus Gips.
DE3008857A1 (de) Mittel auf der grundlage eines silikats, eines haerters und eines zuckers sowie seine verwendung zum haerten von sanden in der kaelte
DE595234C (de) Verfahren zur Herstellung von Kontaktkoerpern von hoher mechanischer Festigkeit
DE2410482A1 (de) Natriumsilikat-gebundene, mgo enthaltende, gebrauchsfertig zubereitete, feuerfeste massen
AT146060B (de) Verfahren zur Herstellung leicht preßfähiger Massen aus löslichen Cellulosederivaten, insbesondere Celluloseestern und Celluloseäthern, und deren Weiterverarbeitung.
DE446189C (de) Herstellung pilierter, haltbarer und nicht auswitternder Seifen
EP0032596B1 (de) Verfahren zur Herstellung von verlorenen Formen
DE2514756A1 (de) Verfahren zur herstellung von fluorithaltigen briketts
DE1132421B (de) Verfahren zur Herstellung von Kochsalzbloecken fuer Speisezwecke
DE1768554C3 (de) Suppositorienmasse und Verfahren zu ihrer Herstellung
DE2952595A1 (de) Mittel zur herstellung von giessereiformen
DE1646391A1 (de) Verfahren zur Herstellung von Plastifizierungsmitteln fuer die Behandlung von koernigen oder pulverigen Materialien

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BI-TEC GMBH GESELLSCHAFT FUER BINDEMITTEL-TECHNOLO

17P Request for examination filed

Effective date: 19870328

17Q First examination report despatched

Effective date: 19880113

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 61258

Country of ref document: AT

Date of ref document: 19910315

Kind code of ref document: T

ITF It: translation for a ep patent filed
ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19911120

Year of fee payment: 8

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911227

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19920112

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19920117

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920131

Ref country code: LI

Effective date: 19920131

Ref country code: CH

Effective date: 19920131

Ref country code: BE

Effective date: 19920131

26 Opposition filed

Opponent name: HUETTENES-ALBERTUS, CHEMISCHE WERKE GMBH

Effective date: 19911206

Opponent name: FIRMA MESROC GMBH, VERTRIEB TECHNISCHER PRODUKTE

Effective date: 19911206

NLR1 Nl: opposition has been filed with the epo

Opponent name: HUETTENES-ALBERTUS, CHEMISCHE WERKE GMBH.

Opponent name: FIRMA MESROC GMBH VERTRIEB TECHNISCHER PRODUKTE.

BERE Be: lapsed

Owner name: BI-TEC G.M.B.H. GESELLSCHAFT FUR BINDEMITTEL-TECH

Effective date: 19920131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19920801

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930112

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930113

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930112

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930930

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 85100275.8

Effective date: 19930810

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION REJECTED

27O Opposition rejected

Effective date: 19950913

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAE Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOS REFNO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAE Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOS REFNO

APAE Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOS REFNO

APCC Communication from the board of appeal sent

Free format text: ORIGINAL CODE: EPIDOS OBAPO

APCC Communication from the board of appeal sent

Free format text: ORIGINAL CODE: EPIDOS OBAPO

PLBP Opposition withdrawn

Free format text: ORIGINAL CODE: 0009264

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO