DE1508712A1 - Binder for sand cores and molds - Google Patents

Binder for sand cores and molds

Info

Publication number
DE1508712A1
DE1508712A1 DE19651508712 DE1508712A DE1508712A1 DE 1508712 A1 DE1508712 A1 DE 1508712A1 DE 19651508712 DE19651508712 DE 19651508712 DE 1508712 A DE1508712 A DE 1508712A DE 1508712 A1 DE1508712 A1 DE 1508712A1
Authority
DE
Germany
Prior art keywords
binder
molds
sand cores
acid
sand
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.)
Pending
Application number
DE19651508712
Other languages
German (de)
Inventor
Moser Dr Franz
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.)
Reichhold Albert Chemie AG
Original Assignee
Reichhold Albert Chemie AG
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
Application filed by Reichhold Albert Chemie AG filed Critical Reichhold Albert Chemie AG
Publication of DE1508712A1 publication Critical patent/DE1508712A1/en
Pending 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
    • B22C1/20—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 organic agents
    • B22C1/22—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 organic agents of resins or rosins
    • B22C1/2233—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 organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B22C1/224—Furan polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/41—Compounds containing sulfur bound to oxygen
    • C08K5/42—Sulfonic acids; Derivatives thereof

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Description

"Bindemittel fiir Sandkerne und -formen." Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Sandkernen und-formen unter Verwendung eines aus Flarnstoffformaldehydharz und Furfurylalkohol bestehenden Bindemittels. "Binder for sand cores and molds." The present invention relates to a method of making sand cores and molds using a binder consisting of flarea formaldehyde resin and furfuryl alcohol.

In den Giessereien wird vielfach als kaithärtendes Bindemittel üir Sandkerne und-formen ein synthetisches Produkt bestehend aus Ilarnstofformaldehydharz und Furfurylaklohol verwendet, das durch Zusatz von Phosphorsäure gehärtet wird. Dieses Verfahren hat den Nachteil, daß bei einzelnen Gußstücken Porositäten auftreten, die zu Ausschuß führen können.In foundries, oil is often used as a hardening binder Sand cores and molds a synthetic product made up of Ilarnstoffformaldehyde resin and furfurylaklohol, which is hardened by adding phosphoric acid, is used. This method has the disadvantage that porosities occur in individual castings, which can lead to rejects.

Es wurde nun gefunden, daß dieser Nachteil behoben werden kann, indem man als Harter anstelle der bisher üblichen Phosphorsäure aromatische Mono- oder Polysulfonsäuren verwendet. Besonders geeignet sind diese Sulfonsäuren niedrigmolekularer aromatischer Kohlenwasserstoffe, beispielsweise diejenigen von Benzol, Toluol, Xylol, Naphthalin, Hinsichtlich Preis und Erhältlichkeit sind Benzolsulfonsäure und p-Toluolsulfonsäure empfehlenswert. Auch können mehrere Sulfonsäuren verwendet werden. Was die als Härter zu verwendende Menge an Sulfonsäure angeht, so ist sie wesentlich geringer als bei Verwendung von Phosphorsäure. Sie beträgt je nach Art des zu verarbeitenden Sandes, der zu erzielenden Erhärtungsgeschwindigkeit und der verwendeten Sulfonsäure zwischen 2 und 25 Gew.% des Bindemittels.It has now been found that this disadvantage can be overcome by as a hardener instead of the previously customary phosphoric acid, aromatic mono- or Polysulfonic acids used. These sulfonic acids of low molecular weight are particularly suitable aromatic hydrocarbons, for example those of benzene, toluene, xylene, Naphthalene, in terms of price and availability, are benzenesulfonic acid and p-toluenesulfonic acid recommendable. Several sulfonic acids can also be used. What the harder Concerning the amount of sulfonic acid to be used, it is much less than in Use of phosphoric acid. Depending on the type of sand to be processed, it is the hardening speed to be achieved and the one used Sulphonic acid between 2 and 25% by weight of the binder.

Beispiel 100 kg belgischer Quarzsand werden in der Mischmaschine mit 100 g einer 80 %igen Lösung technischer p-Toluolsulfonsäure gemischt; dann werden 2 kg eines handelsüblichen sogen. "Furanbinders", bestehend aus 40% Harnstofformaldehydharz und 60% Furfurylalkohol zugesetzt, und das Ganze wird gründlich gemischt. Der Sand wird hierauf in die Kernbüchse gefüllt und der erhaltene Kern ist nach 2 bis 4 Stunden soweit erhärtet, daß er aus der Kernbüchse genommcn, in üblicher Weise geschwärzt und abgegossen werden kann, Example 100 kg of Belgian quartz sand are used in the mixer mixed with 100 g of an 80% solution of technical grade p-toluenesulfonic acid; then will 2 kg of a commercially available so-called. "Furanbinders", consisting of 40% urea-formaldehyde resin and 60% furfuryl alcohol are added and the whole is mixed thoroughly. The sand is then filled into the core box and the core obtained is after 2 to 4 hours hardened to the point that it was removed from the core box, blackened in the usual way and can be poured off,

Claims (4)

P A T H N T A N SP R 1J C U E 1) Verfahren zur ilerstellung von Sandkernen und -formen unter Verwendung eines an sich bekannten mit Furfurylalkohol modifizierten Harnstofformaldehydharzes, dadurch gekennzeichnet, daß man als Härter für das Bindemittel eine aromatische Sulfonsäure verwendet. P A T H N T A N SP R 1J C U E 1) Process for the production of sand cores and molding using a known one modified with furfuryl alcohol Urea-formaldehyde resin, characterized in that it is used as a hardener for the binder an aromatic sulfonic acid is used. 2) Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Menge der aromatischen Sulfonsäure 2 bis 25 Gew.%, bezogen auf das Bindemittel betragt.2) Method according to claim 1, characterized in that the amount of the aromatic sulfonic acid is 2 to 25% by weight, based on the binder. 3) Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man n-Toluolsulfonsäure verwendet.3) Method according to claim 1 or 2, characterized in that one n-toluenesulfonic acid is used. 4) Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man Benzolsulfonsäure verwendet.4) Method according to one of claims 1 to 3, characterized in that that one uses benzenesulfonic acid.
DE19651508712 1965-12-29 1965-12-29 Binder for sand cores and molds Pending DE1508712A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER0042337 1965-12-29

Publications (1)

Publication Number Publication Date
DE1508712A1 true DE1508712A1 (en) 1969-10-30

Family

ID=7406622

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19651508712 Pending DE1508712A1 (en) 1965-12-29 1965-12-29 Binder for sand cores and molds

Country Status (1)

Country Link
DE (1) DE1508712A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2831528A1 (en) * 1978-07-18 1980-02-07 Kruglikov Carbamide-furan resin binder for foundry cores - prepd. from a urea!-formaldehyde! resin, urea and furyl alcohol

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2831528A1 (en) * 1978-07-18 1980-02-07 Kruglikov Carbamide-furan resin binder for foundry cores - prepd. from a urea!-formaldehyde! resin, urea and furyl alcohol

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