EP0150745A2 - Composition de liant pour moulage - Google Patents

Composition de liant pour moulage Download PDF

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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)
English (en)
Other versions
EP0150745A3 (en
EP0150745B1 (fr
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=google_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/de
Publication of EP0150745A2 publication Critical patent/EP0150745A2/fr
Publication of EP0150745A3 publication Critical patent/EP0150745A3/de
Application granted granted Critical
Publication of EP0150745B1 publication Critical patent/EP0150745B1/fr
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)
EP85100275A 1984-02-02 1985-01-12 Composition de liant pour moulage Expired - Lifetime EP0150745B1 (fr)

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

Family

ID=6226549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100275A Expired - Lifetime EP0150745B1 (fr) 1984-02-02 1985-01-12 Composition de liant pour moulage

Country Status (4)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401388A1 (fr) * 1988-12-20 1990-12-12 Mitsubishi Chemical Corporation Preparation a base de silicate modifie et production d'un moule en sable a l'aide de cette preparation
DE102006061876A1 (de) 2006-12-28 2008-07-03 Ashland-Südchemie-Kernfest GmbH Kohlenhydrathaltige Formstoffmischung
DE202007019192U1 (de) 2006-10-19 2011-02-03 Ashland-Südchemie-Kernfest GmbH Kohlenhydrathaltige Formstoffmischung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO2019027038A1 (fr) * 2017-08-03 2019-02-07 旭有機材株式会社 Matériau de moule, son procédé de production, procédé de production de moule et procédé de régénération d'agrégat réfractaire récupéré

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 (de) * 1971-11-11 1973-05-17 Woellner Werke Verfahren zur herstellung von formen und kernen fuer den metallguss
DE2641249A1 (de) * 1975-09-15 1977-03-31 Avebe Coop Verkoop Prod Bindemittelzusammensetzungen
EP0029196A1 (fr) * 1979-11-17 1981-05-27 Henkel Kommanditgesellschaft auf Aktien Liants à base de solutions de silicate alcalin et leur utilisation

Family Cites Families (5)

* 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
BE551767A (fr) * 1955-10-14
DE1242800B (de) * 1964-04-06 1967-06-22 Harvest Queen Mill & Elevator Formbindemittel
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 (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

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 (de) * 1971-11-11 1973-05-17 Woellner Werke Verfahren zur herstellung von formen und kernen fuer den metallguss
DE2641249A1 (de) * 1975-09-15 1977-03-31 Avebe Coop Verkoop Prod Bindemittelzusammensetzungen
EP0029196A1 (fr) * 1979-11-17 1981-05-27 Henkel Kommanditgesellschaft auf Aktien Liants à base de solutions de silicate alcalin et leur utilisation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401388A1 (fr) * 1988-12-20 1990-12-12 Mitsubishi Chemical Corporation Preparation a base de silicate modifie et production d'un moule en sable a l'aide de cette preparation
EP0401388A4 (en) * 1988-12-20 1991-04-17 Mitsubishi Kasei Corporation Modified silicate composition and production of sand mold therefrom
DE202007019192U1 (de) 2006-10-19 2011-02-03 Ashland-Südchemie-Kernfest GmbH Kohlenhydrathaltige Formstoffmischung
DE102006061876A1 (de) 2006-12-28 2008-07-03 Ashland-Südchemie-Kernfest GmbH Kohlenhydrathaltige Formstoffmischung

Also Published As

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

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