EP0150745A2 - Binder composition for moulding - Google Patents

Binder composition for moulding Download PDF

Info

Publication number
EP0150745A2
EP0150745A2 EP85100275A EP85100275A EP0150745A2 EP 0150745 A2 EP0150745 A2 EP 0150745A2 EP 85100275 A EP85100275 A EP 85100275A EP 85100275 A EP85100275 A EP 85100275A EP 0150745 A2 EP0150745 A2 EP 0150745A2
Authority
EP
European Patent Office
Prior art keywords
binder according
amount
binder
sand
acid
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.)
Granted
Application number
EP85100275A
Other languages
German (de)
French (fr)
Other versions
EP0150745A3 (en
EP0150745B1 (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
SEADERS JOHN
Bi-Tec Gesellschaft fur Bindemittel-Technologie GmbH
SEADERS JOHN
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=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0150745(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SEADERS JOHN, Bi-Tec Gesellschaft fur Bindemittel-Technologie GmbH, SEADERS JOHN filed Critical SEADERS JOHN
Priority to AT85100275T priority Critical patent/ATE61258T1/en
Publication of EP0150745A2 publication Critical patent/EP0150745A2/en
Publication of EP0150745A3 publication Critical patent/EP0150745A3/en
Application granted granted Critical
Publication of EP0150745B1 publication Critical patent/EP0150745B1/en
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, consisting of an alkali metal silicate, preferably sodium silicate, a polyhydric alcohol, and other additives, and a method for producing foundry molds.
  • Binder mixtures cast forms show partly hygroscopic properties and. therefore their dimensional stability is short-lived. This phenomenon complicates a certain stockpiling and therefore a rational way of working.
  • the actual binder burns at about 200 ° C during the casting process.
  • the bonds that he creates break down between the grains of sand, with the result that the sand mold disintegrates and crumbles out of complicated spatial shapes. This eliminates the need for an additional work step previously required, in which the casting mold had to be removed from the cast model with great difficulty.
  • 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.
  • non-hygroscopic starch and the metal oxide are added in powder form and in an amount of 0.25 to% by weight of the amount of sand. This achieves a certain fluidity and through hardening.
  • the non-hygroscopic starch and the metal oxide are added to the sand before the sodium silicate and the modified carbohydrate are added.
  • a lubricant for example in powder form, is added in an amount of 1 to 2% by weight of the amount of sand or 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 increase the tensile strength in the binder system according to the invention. of the binder of almost 25%. This characteristic property can be improved by using CO 2 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, carboxylic 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 hardening 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)

Abstract

The binder composition for consolidating the moulding sand for foundry purposes consists of an alkali metal silicate, preferably sodium silicate, a polyhydric alcohol and further additives, modified carbohydrates, non-hygroscopic starch, a metal oxide and a filler being envisaged as additives.

Description

Die Erfindung betrifft ein Bindemittelgemisch zur Verfestigung des Formsandes für Gießereizwecke, bestehend aus einem Alkalimetallsilikat, vorzugsweise Natriumsilikat, einem mehrwertigen Alkohol, und weiteren Additiven sowie ein Verfahren zur Herstellung von Gießereiformen.The invention relates to a binder mixture for solidifying the molding sand for foundry purposes, consisting of an alkali metal silicate, preferably sodium silicate, a polyhydric alcohol, and other additives, and a method for producing foundry molds.

Bei der Verwendung der zur Zeit üblichen Bindemittelgemische ergeben sich teilweise folgende Schwierigkeiten:

  • Einige Komponenten der herkömmlichen Gemische haben nicht nur einen starken, unangenehmen Geruch, sondern sind auch giftig und daher gesundheitsschädlich. Sie belasten die Umwelt und ihre Abfallprodukte müssen mit einem hohen finanziellen Aufwand beseitigt werden.
When using the currently customary binder mixtures, the following difficulties arise in some cases:
  • Some components of the conventional mixtures not only have a strong, unpleasant smell, but are also toxic and therefore harmful to health. They pollute the environment and their waste products have to be disposed of at great expense.

Ein anderes Problem besteht darin, daß sich die mit einigen Bindemittelgemischen hergestellten Gießformen nach der Abkühlphase nur unter großen Schwierigkeiten von dem ausgehärteten Modell entfernen lassen. Bei komplizierteren Formgebungen ist es häufig notwendig, die Gießform in sorgfältiger Handarbeit zu entfernen. Dabei besteht die Gefahr der Beschädigung der Oberfläche des Modells. Dazu kommt; daß dieser zusätzliche Aufwand große finanzielle Zusatzkosten verursacht, die sich unweigerlich in einer Verteuerung der Gießformen niederschlagen.Another problem is that the molds produced with some binder mixtures can only be removed from the cured model with great difficulty after the cooling phase. With more complicated shapes, it is often necessary to remove the casting mold by hand. There is a risk of damaging the surface of the model. Add to that; that this additional effort causes large additional financial costs, which inevitably result in an increase in the cost of the casting molds.

Es hat sich außerdem gezeigt, daß' die mit den seitherigen Bindemittelgemischen gegossene Formen teilweise hygroskopische Eigenschaften zeigen und. daher ihre Formbeständigkeit nur von kurzer Dauer ist. Dieses Phänomen erschwert eine gewisse Vorratshaltung und damit eine rationelle Arbeitsweise.It has also been shown that ' those with the former Binder mixtures cast forms show partly hygroscopic properties and. therefore their dimensional stability is short-lived. This phenomenon complicates a certain stockpiling and therefore a rational way of working.

Die Erfindung löst diese Probleme dadurch, daß als Additive modifizierte Kohlehydrate, nichthygroskopische Stärke, Metalloxid und ein Füllstoff vorgesehen sind. Dabei hat es sich als vorteilhaft erwiesen, daß im Natriumsilikat ein Verhältnis von Na20 : Si02 = 1 :2 bis' 1 : 3 besteht. Diese Komponenten des Bindemittelgemisches sind geruchlos und völlig ungefährlich, ja sogar eßbar. Der Umgang und das Arbeiten mit den Sandgemischen, die diese Komponenten enthalten, erfordern keinerlei Schutzmaßnahmen; die Beseitigung der Abfallprodukte ist völlig problemlos.The invention solves these problems in that modified carbohydrates, non-hygroscopic starch, metal oxide and a filler are provided as additives. It has proven to be advantageous that there is a ratio of Na 2 0: Si0 2 = 1: 2 to 1: 3 in the sodium silicate. These components of the binder mixture are odorless and completely harmless, even edible. Handling and working with the sand mixtures containing these components do not require any protective measures; the disposal of waste products is completely problem-free.

Der eigentliche Binder verbrennt beim Gießprozeß bei ungefähr 200°C. Dabei brechen die durch ihn hervorgerufenen Bindungen zwischen den Sandkörnern zusammen, mit der Folge, daß die Sandform zerfällt und aus komplizierten Raumformen herausbröselt. Dadurch erübrigt sich ein vorher notwendiger, zusätzlicher Arbeitsvorgang, bei dem die Gießform mit viel Mühe von dem gegossenen Modell entfernt werden mußte. Auf der anderen Seite sind die aus Sand und dem erfindungsgemäßen Bindemittelgemisch hergestellten Gießformen gegen Feuchtigkeitseinflüsse absolut beständig.The actual binder burns at about 200 ° C during the casting process. The bonds that he creates break down between the grains of sand, with the result that the sand mold disintegrates and crumbles out of complicated spatial shapes. This eliminates the need for an additional work step previously required, in which the casting mold had to be removed from the cast model with great difficulty. On the other hand, the casting molds made from sand and the binder mixture according to the invention are absolutely resistant to the effects of moisture.

Das Natriumsilikat und das modifizierte Kohlehydrat sind Hauptkomponenten und bedingen folgende charakteristische Eigenschaften dieses Bindersystems: Es zeichnet sich durch eine geringe Viskosität und eine durch diese Komponenten bedingte Feuchtigkeitsbeständigkeit aus. Außerdem weist dieses System vollständige chemische Reaktionen.mit den Gelierreagenzien und erhöhte Reaktionsraten gegenüber den nichtmodifizierten Natriumsilikat-Bindersystemen auf. Ein weiterer Unterschied gegenüber den nichtmodifizierten Natriumsilikat-Bindersystemen liegt in dem tieferen Gefrierpunkt und einer erhöhten Elastizität der Bindungen zwischen den Sandkörnern nach dem Geliervorgang. Weiterhin zeichnet sich dieses System durch einen reduzierten Katalysatorverbrauch aus.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.

Es liegt im Rahmen der Erfindung, daß das modifizierte Kohlehydrat ein nichthygroskopisches Stärkehydrolysat mit einer Reduktionskraft 6 - 15 % ist, das auch als Pulver mit -100 mesh bis -200 mesh zugesetzt werden kann.It is within the scope of the invention that 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.

Es ist weiterhin vorgesehen, daß die nichthygroskopische Stärke und das Metalloxid (vorzugsweise Eisenoxid) in Pulverform und in einer Menge von 0,25 bis Gew. % der Sandmenge zugesetzt werden. Dadurch wird eine gewisse Fließfähigkeit und das Durchhärten erreicht. Der Zusatz der nichthygroskopischen Stärke und des Metalloxids zum Sand erfolgt vor der Zugabe des Natriumsilikats und des modifizierten Kohlehydrats.It is further contemplated that the non-hygroscopic starch and the metal oxide (preferably iron oxide) are added in powder form and in an amount of 0.25 to% by weight of the amount of sand. This achieves a certain fluidity and through hardening. The non-hygroscopic starch and the metal oxide are added to the sand before the sodium silicate and the modified carbohydrate are added.

Es liegt weiterhin im Rahmen der Erfindung, daß als Füllstoff ein Schmiermittel, beispielsweise in Pulverform in einer Menge von 1 bis 2 Gew. % der Sandmenge oder aber als öl in einer Menge von 0,10 - 0,25 Gew. % der Sandmenge zugesetzt wird. Durch die Zugabe dieses Schmiermittels wird die Fließfähigkeit der Sandmischung verbessert. Die nichthygroskopische Stärke, das Metalloxid sowie das Schmiermittel bewirken in dem erfindungsgemäßen Bindersystem eine Erhöhung der Zugfestigkeit . des Binders von nahezu 25 %. Diese charakteristische Eigenschaft kann noch durch den Einsatz von CO2 oder eines chemischen Katalysators verbessert werden. Die erfindungsgemäße Mischung zeigt, bedingt durch eine schnelle Trocknung, innerhalb kurzer Zeit eine hohe Festigkeit. Es ist auch bemerkenswert, daß die abgebundenen Sandformen zur Erreichung einer Dehydrierung nicht im Ofen getrocknet oder gebrannt werden müssen. Dieser Vorteil schlägt sich in einer großen Ersparnis an Energie und Arbeitsaufwand und damit an Herstellungskosten nieder.It is also within the scope of the invention that a lubricant, for example in powder form, is added in an amount of 1 to 2% by weight of the amount of sand or 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 increase the tensile strength in the binder system according to the invention. of the binder of almost 25%. This characteristic property can be improved by using CO 2 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.

Es hat sich als besonders vorteilhaft erwiesen, daß als Katalysatoren Esterverbindungen, aus einem mehrwertigen Alkohol und organischen Säuren, eingesetzt werden. Folgende Säuren haben sich als besonders geeignet erwiesen: Essigsäure, Carbonsäure, Zitronensäure, Glutarsäure und Bernsteinsäure. Diese verschiedenen Ester werden in unterschiedlichen Mengen und Kombinationen gemischt. Art und Menge des Katalysators beeinflussen die Produktionszeit'der Gießformen, die sich von 2 Minuten bis mehrere Stunden erstrecken kann.It has proven to be particularly advantageous that ester compounds from a polyhydric alcohol and organic acids are used as catalysts. The following acids have proven to be particularly suitable: acetic acid, carboxylic 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.

Bei dem Verfahren zur Herstellung von Gießereiformen kann als Formsand jeder in der Gießereitechnik übliche Sand, wie z.B. Zirkon, Chromit, Olivin, und Silikat verwendet werden. Der Anteil des Formsandes beläuft sich ungefähr auf 96,5 %, der der Natriumsilikatlösung auf 3 %, der der Stärke und des Metalloxids auf 0,5 % und der des Schmiermittels bis zu 0,25 %. Wird ein Katalysator verwendet, so wird dieser in einer Menge von ungefähr 0,3 % zugesetzt. Das Verhältnis der Vorbereitungszeit zur Härtungszeit beträgt 1 : 2. Die mit dem erfindungsgemäßen Bindemittelgemisch und dem erfindungsgemäßen Verfahren hergestellten Gießformen haben eine lange Haltbarkeit, die sich ungefähr auf 30 Tage beläuft, wobei für die Aufbewahrung der fertigen Gießereiformen keine besonderen Anforderungen gestellt sind. Der Binder verbrennt beim Gießprozeß bei ungefähr 200°C, wobei das Sandgefüge lose wird und abbröselt.In the process for producing foundry molds, 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 hardening 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.

Claims (19)

1. Bindemittelgemisch zur Verfestigung des Formsandes für Gießereizwecke, bestehend aus einem Alkalimetallsilikat, vorzugsweise Natriumsilikat, einem mehrwertigen Alkohol und weiteren Additiven, dadurch gekennzeichnet, daß als Additive modifizierte Kohlehydrate, nichthygroskopische Stärke, Metalloxid und ein Füllstoff vorgesehen sind.1. Binder mixture for solidifying the molding sand for foundry purposes, consisting of an alkali metal silicate, preferably sodium silicate, a polyhydric alcohol and other additives, characterized in that modified carbohydrates, non-hygroscopic starch, metal oxide and a filler are provided as additives. -2. Bindemittel nach Anspruch.1, dadurch gekennzeichnet, daß das Verhältnis Na20 : Si02 = 1 : 2 bis 1 : 3 ist.-2. Binder according to Claim 1, characterized in that the ratio Na 2 0: Si0 2 = 1: 2 to 1: 3. 3. Bindemittel nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß das modifizierte Kohlehydrat ein nichthygroskopisches Stärkehydrolysat mit einer Reduktionskraft von 6 - 15 % ist.3. Binder according to one of claims 1 to 2, characterized in that the modified carbohydrate is a non-hygroscopic starch hydrolyzate with a reducing power of 6-15%. 4. Bindemittel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das modifizierte Kohlehydrat als Pulver mit -100 mesh bis -200 mesh zugesetzt wird.4. Binder according to one of claims 1 to 3, characterized in that the modified carbohydrate is added as a powder with -100 mesh to -200 mesh. 5. Bindemittel nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die nichthygroskopische Stärke und das Metalloxid in Pulverform zugesetzt werden.5. Binder according to one of claims 1 to 4, characterized in that the non-hygroscopic starch and the metal oxide are added in powder form. 6. Bindemittel nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Menge der nichthygroskopischen Stärke und des Metalloxids 0,25 bis 1 Gew. % der Sandmenge beträgt.6. Binder according to one of claims 1 to 5, characterized in that the amount of the non-hygroscopic starch and the metal oxide is 0.25 to 1% by weight of the amount of sand. 7. Bindemittel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Füllstoff ein Schmiermittel ist.7. Binder according to one of claims 1 to 6, characterized in that the filler is a lubricant. 8. Bindemittel nach Anspruch 7, dadurch gekennzeichnet, daß das Schmiermittel in Pulverform in einer Menge von 1 bis 2 Gew. % der Sandmenge zugesetzt wird.8. Binder according to claim 7, characterized in that the lubricant is added in powder form in an amount of 1 to 2% by weight of the amount of sand. 9. Bindemittel nach Anspruch 7, dadurch gekennzeichnet, daß das Schmiermittel als öl in einer Menge von 0,10 - 0,25 Gew. % der Sandmenge zugesetzt wird.9. Binder according to claim 7, characterized in that the lubricant is added as an oil in an amount of 0.10 - 0.25% by weight of the amount of sand. 10. Bindemittel nach einem der Ansprüche 1 bis 9, dadurch ge-- kennzeichnet, daß als Katalysator Esterverbindungen oder Kohlensäure eingesetzt wird.10. Binder according to one of claims 1 to 9, characterized in that the catalyst used is ester compounds or carbonic acid. 11. Bindemittel nach Anspruch. 10, dadurch gekennzeichnet, daß der Ester aus einem mehrwertigen Alkohol und einer organischen Säure hergestellt ist.11. Binder according to claim. 10, characterized in that the ester is made from a polyhydric alcohol and an organic acid. 12. Bindemittel nach Anspruch 11, dadurch gekennzeichnet, daß als organische Säure Essigsäure verwendet wird.12. Binder according to claim 11, characterized in that acetic acid is used as the organic acid. 13. Bindemittel nach Anspruch 11, dadurch gekennzeichnet, daß als organische Säure Carbonsäure verwendet wird.13. Binder according to claim 11, characterized in that carboxylic acid is used as the organic acid. 14. Bindemittel nach Anspruch 11, dadurch gekennzeichnet, daß als organische Säure Zitronensäure verwendet wird.14. Binder according to claim 11, characterized in that citric acid is used as the organic acid. 15. Bindemittel nach Anspruch 11, dadurch gekennzeichnet, daß als organische Säure Glutarsäure verwendet wird.15. Binder according to claim 11, characterized in that glutaric acid is used as the organic acid. 16. Bindemittel nach Anspruch 11, dadurch gekennzeichnet, daß als organische Säure Bernsteinsäure verwendet wird.16. A binder according to claim 11, characterized in that succinic acid is used as the organic acid. 17. Verfahren zur Herstellung von Gießereiformen aus Formsand und einem Bindemittelgemisch, hergestellt nach einem der Ansprüche 1 bis 16, dadurch gekennzeichnet, daß die Zugabe der nichthygroskopischen Stärke und des Metalloxids vor der Zugabe des Natriumsilikats und des modifizierten Kohlehydrats zum Formsand erfolgt.17. A method for producing foundry molds from molding sand and a binder mixture, prepared according to one of claims 1 to 16, characterized in that the addition of the non-hygroscopic starch and the metal oxide is carried out before the addition of the sodium silicate and the modified carbohydrate to the molding sand. 18. Verfahren zur Herstellung von Gießereiformen nach einem der Ansprüche 1 bis 17, dadurch gekennzeichnet, daß die Menge des Formsandes beispielsweise 96,5 %, die der Natriumsilikatlösung 3 %, die der Stärke und des Metalloxids 0,5 % und die des Schmiermittels bis zu 0,25 % beträgt.18. A method for producing foundry molds according to one of claims 1 to 17, characterized in that the amount of molding sand, for example 96.5%, that of the sodium silicate solution 3%, that of the starch and the metal oxide 0.5% and that of the lubricant is 0.25%. 19. Verfahren zur Herstellung von Gießereiformen nach Anspruch 18, dadurch gekennzeichnet, daß ein Katalysator in einer Menge von ungefähr 0,3 % zugesetzt wird.19. A method for producing foundry molds according to claim 18, characterized in that a catalyst is added in an amount of about 0.3%.
EP85100275A 1984-02-02 1985-01-12 Binder composition for moulding Expired - Lifetime EP0150745B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100275T ATE61258T1 (en) 1984-02-02 1985-01-12 BINDER MIXTURE FOR CONSOLIDATION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843403583 DE3403583A1 (en) 1984-02-02 1984-02-02 Binder mix for consolidation
DE3403583 1984-02-02

Publications (3)

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

Family

ID=6226549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100275A Expired - Lifetime EP0150745B1 (en) 1984-02-02 1985-01-12 Binder composition for moulding

Country Status (4)

Country Link
EP (1) EP0150745B1 (en)
AT (1) ATE61258T1 (en)
DD (1) DD233959A5 (en)
DE (1) DE3403583A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401388A1 (en) * 1988-12-20 1990-12-12 Mitsubishi Chemical Corporation Modified silicate composition and production of sand mold therefrom
DE102006061876A1 (en) 2006-12-28 2008-07-03 Ashland-Südchemie-Kernfest GmbH Molding material mixture, useful for producing casting molds for metal processing, comprises a fireproof molding base material, a binder based on water glass, a particulate metal oxide, e.g. silicon dioxide and further a carbohydrate
DE202007019192U1 (en) 2006-10-19 2011-02-03 Ashland-Südchemie-Kernfest GmbH Carbohydrate-containing molding material mixture

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105983645A (en) * 2015-12-31 2016-10-05 安徽创奇乐智能游乐设备有限公司 High-refractoriness and low-expansion molding sand for steel castings and preparation method of molding sand
CN110944768A (en) * 2017-08-03 2020-03-31 旭有机材株式会社 Casting mold material and method for producing same, method for producing casting mold, and method for recycling recycled refractory aggregate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1087767A (en) * 1965-01-29 1967-10-18 British Non Ferrous Metals Res Improvements in and relating to foundry moulding sand compositions
DE2156048A1 (en) * 1971-11-11 1973-05-17 Woellner Werke Casting mould and core prodn - from foundry sand, water glass ,binder and using lactate hardeners
DE2641249A1 (en) * 1975-09-15 1977-03-31 Avebe Coop Verkoop Prod BINDER COMPOSITIONS
EP0029196A1 (en) * 1979-11-17 1981-05-27 Henkel Kommanditgesellschaft auf Aktien Binder based on alkali-metal silicate solutions, and their use

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH321200A (en) * 1952-07-09 1957-04-30 Schmidt Wilhelm Process for the production of molds or cores for foundry purposes
LU34695A1 (en) * 1955-10-14
DE1242800B (en) * 1964-04-06 1967-06-22 Harvest Queen Mill & Elevator Molding binder
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
FR2348771A1 (en) * 1976-04-21 1977-11-18 Roquette Freres Sand mould and core binder contg. silicate - and non-reducing polyol release agent having at least two alcoholic hydroxyl gps.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1087767A (en) * 1965-01-29 1967-10-18 British Non Ferrous Metals Res Improvements in and relating to foundry moulding sand compositions
DE2156048A1 (en) * 1971-11-11 1973-05-17 Woellner Werke Casting mould and core prodn - from foundry sand, water glass ,binder and using lactate hardeners
DE2641249A1 (en) * 1975-09-15 1977-03-31 Avebe Coop Verkoop Prod BINDER COMPOSITIONS
EP0029196A1 (en) * 1979-11-17 1981-05-27 Henkel Kommanditgesellschaft auf Aktien Binder based on alkali-metal silicate solutions, and their use

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401388A1 (en) * 1988-12-20 1990-12-12 Mitsubishi Chemical Corporation Modified silicate composition and production of sand mold therefrom
EP0401388A4 (en) * 1988-12-20 1991-04-17 Mitsubishi Kasei Corporation Modified silicate composition and production of sand mold therefrom
DE202007019192U1 (en) 2006-10-19 2011-02-03 Ashland-Südchemie-Kernfest GmbH Carbohydrate-containing molding material mixture
DE102006061876A1 (en) 2006-12-28 2008-07-03 Ashland-Südchemie-Kernfest GmbH Molding material mixture, useful for producing casting molds for metal processing, comprises a fireproof molding base material, a binder based on water glass, a particulate metal oxide, e.g. silicon dioxide and further a carbohydrate

Also Published As

Publication number Publication date
EP0150745A3 (en) 1986-11-26
ATE61258T1 (en) 1991-03-15
DE3403583C2 (en) 1987-12-17
EP0150745B1 (en) 1991-03-06
DE3403583A1 (en) 1985-08-08
DD233959A5 (en) 1986-03-19

Similar Documents

Publication Publication Date Title
EP0771599B2 (en) Binder based on polyurethanes for producing foundry mould and core compositions
DE2951502C2 (en) Foundry sand mix
EP1715970A2 (en) Water-soluble salt cores for die casting
EP0804980B1 (en) Feeder inserts and production thereof
DE3403583C2 (en)
DE1252853B (en) Binder for foundry sands
DE3431951A1 (en) HEAT-RESISTANT COMPOSITION
WO1998017417A1 (en) Method for producing moulding sand for foundry purposes
DE19727540A1 (en) Epoxy resin binding agent for production of foundry moulds and cores
DE3527086A1 (en) THROUGH HARDENABLE BINDING AGENT FOR FOUNDRY MOLDING MIXTURES
DE2518485A1 (en) Binder for foundry mould and core matl. - comprising aq alkali silicate and org. colloidal soln e.g. of starch or cellulose ether
DE3049174C2 (en) Cold-curing molding compound to avoid the formation of veins
DE2815753A1 (en) METHOD FOR MANUFACTURING A CASTING FORM OR A CASTING CORE
DE2629667A1 (en) MEANS TO FACILITATE THE LOSS OF FOUNDRY BLANKS
DE2100232A1 (en) Additives for particulate, inorganic mixtures such as molding sand or clay
DE2413765C3 (en) Molding compound for the manufacture of foundry molds and cores
EP0032596B1 (en) Process for producing lost moulds
DE68927181T2 (en) FIRE-RESISTANT PREPARATION, READY TO HARDEN AND PREPARE
DE597046C (en) Dough-shaped binder for foundry cores made of quartz sand to be dried free-standing
AT339516B (en) BINDERS FOR FOUNDRY FORM AND CORE COMPOUNDS AND THE PROCESS FOR THEIR PRODUCTION
DE2439395C3 (en) Method of making a casting mold
DE742525C (en) Binding agent for the production of foundry molds and cores
DE2410482A1 (en) SODIUM SILICATE-Bound, MGO CONTAINING, READY-TO-USE, REFRACTORY MASS
DE1558114B1 (en) Self-curing mixture of particulate material and aqueous alkali silicate
DE3008857A1 (en) AGENT BASED ON A SILICATE, HARDENER AND SUGAR, AND ITS USE FOR HARDENING SANDS IN THE COLD

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

Owner name: ING. C. GREGORJ S.P.A.

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