EP0150745B1 - Composition de liant pour moulage - Google Patents

Composition de liant pour moulage Download PDF

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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)
Other versions
EP0150745A2 (fr
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
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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/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

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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)
  • Reinforced Plastic Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (8)

  1. Mélange de liant pour le durcissement du sable de moulage utilisé en fonderie, comprenant une solution de silicate de sodium. carctérisé en ce qu'il contient d'autres additifs :
    - du polyalcool,
    - un hydrolysat non hygroscopique d'amidon ayant un pouvoir réducteur de 6 à 15 %,
    - de l'amidon non hygroscopique,
    - de l'oxyde de fer et
    - un lubrifiant,
    l'amidon non hygroscopique et l'oxyde de fer étant ajoutés a la quantité ce sable sous une forme pulvérulente et dans une proportion de 0,25 à 1% en poids.
  2. Liant selon la revendication 1,caractérisé en ce que le en ce eue le NaO2 et le SiO2 se trouvent dans un rapport de 1:2 à 1:3 dans le silicate de sodium de la solution de silicate de sodium.
  3. Liant selon l'une des revendications 1 à 2, caractérisé en ce que l'hydrolysat d'amidon non hygroscopique ayant un pouvoir réducteur de 6 a 15% est ajouté sous forme de poudre de 0.149 mm (100 mesh) a 0,074 mm (200 mesh).
  4. Mélange de liant selon l'une des revendications 1 à 3. caractérisé en ce que le lubrifiant est ajouté sous forme pulvérulente dans une proportion de 1 à 2% en poids de la quantité de sable.
  5. Mélange de liant selon la revendication 4. caractérisé en ce que le lubrifiant est ajouté sous forme d'huile dans une proportion de 0,10 à 0,25 % en poids de la quantité de sable.
  6. Liant selon l'une des revendications 1 à 5, caractérisé en ce eue le catalyseur est un composé d'ester ou de l'acide carbonique.
  7. Liant selon la revendication 6, caractérisé en ce que le composé d'ester est un ester d'un polyalcool et d'un acide organique.
  8. Utilisation du mélange de liant selon l'une des revendications 1 à 7 pour la fabrication de moules de fonderie, l'amidon non hygroscopique et l'oxyde de fer étant ajoutés au sable de moulage avant l'addition de la solution de silicate de sodium et de l'hydrolysat d'amidon non hygroscopique ayant un pouvoir réducteur de 6 à 15%
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 EP0150745A2 (fr) 1985-08-07
EP0150745A3 EP0150745A3 (en) 1986-11-26
EP0150745B1 true 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)

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
DE102006061876A1 (de) * 2006-12-28 2008-07-03 Ashland-Südchemie-Kernfest GmbH Kohlenhydrathaltige Formstoffmischung
BRPI0718281B1 (pt) 2006-10-19 2015-09-15 Ashland Südchemie Kernfest Gmbh mistura de semiproduto moldado contendo carboidratos
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 (fr) * 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
DE3403583A1 (de) 1985-08-08
EP0150745A2 (fr) 1985-08-07
DD233959A5 (de) 1986-03-19
ATE61258T1 (de) 1991-03-15
DE3403583C2 (fr) 1987-12-17
EP0150745A3 (en) 1986-11-26

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