DE1569023C3 - Binder for the hot box process - Google Patents

Binder for the hot box process

Info

Publication number
DE1569023C3
DE1569023C3 DE19651569023 DE1569023A DE1569023C3 DE 1569023 C3 DE1569023 C3 DE 1569023C3 DE 19651569023 DE19651569023 DE 19651569023 DE 1569023 A DE1569023 A DE 1569023A DE 1569023 C3 DE1569023 C3 DE 1569023C3
Authority
DE
Germany
Prior art keywords
hot box
box process
binder
alcohol
formaldehyde
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
Application number
DE19651569023
Other languages
German (de)
Other versions
DE1569023B2 (en
DE1569023A1 (en
Inventor
Gerhard 4040 Neuss Galwas
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.)
Huettenes Albertus Chemische Werke GmbH
Original Assignee
Huettenes Albertus Chemische Werke 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
Application filed by Huettenes Albertus Chemische Werke GmbH filed Critical Huettenes Albertus Chemische Werke GmbH
Publication of DE1569023A1 publication Critical patent/DE1569023A1/en
Publication of DE1569023B2 publication Critical patent/DE1569023B2/en
Application granted granted Critical
Publication of DE1569023C3 publication Critical patent/DE1569023C3/en
Expired 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G14/00—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00
    • C08G14/02—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes
    • C08G14/04—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols
    • C08G14/12—Chemically modified polycondensates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Phenolic Resins Or Amino Resins (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Mold Materials And Core Materials (AREA)

Description

Es ist bekannt, daß Kondensationsprodukte aus Harnstoff und Formaldehyd mit und ohne Zusatz von Phenolresolen als Bindemittel für das Hot-Box-Verfahren verwendet werden. Um feste, widerstandsfähige Kerne zu erhalten, müssen 1 Mol Harnstoff mit mindestens 4,8 bis 6 Mol Formaldehyd kondensiert werden. Wenn man berücksichtigt, daß das Phenolresol auch noch etwa 1,6 Mol Formaldehyd je Mol Phenol enthält, so ergibt sich für die Herstellung dieser »Hot-Box-Binder« ein Molverhältnis von 6,3 bis 7,5 Mol Formaldehyd auf 1 Mol Harnstoff plus 1 Mol Phenol.It is known that condensation products of urea and formaldehyde with and without the addition of Phenolic resoles can be used as binders for the hot box process. To be firm, resilient To obtain cores, 1 mole of urea must be condensed with at least 4.8 to 6 moles of formaldehyde will. If you take into account that the phenol resol is also about 1.6 moles of formaldehyde contains per mole of phenol, a molar ratio of 6.3 to 7.5 moles of formaldehyde per 1 mole of urea plus 1 mole of phenol.

Diese Bindemittel ergeben zwar gute Festigkeiten, jedoch ist die Geruchsbelästigung durch frei werdenden Formaldehyd außerordentlich groß. Wird bei der angegebenen Zusammensetzung der Anteil Formaldehyd auf 4 Mol verringert, so wird die Geruchsbelästigung kaum herabgesetzt; dieses Kondensat ist weniger reaktionsfähig und benötigt, um gute Festigkeiten zu erhalten, eine längere Anhärtezeit in der Kernbüchse. Außerdem ist das Kondensat nicht lagerbeständig und gelatiniert bereits nach kurzer Zeit.Although these binders give good strengths, the unpleasant odor is due to the release Formaldehyde extremely large. If the specified composition is the proportion of formaldehyde reduced to 4 moles, the odor nuisance is hardly reduced; this condensate is less reactive and requires a longer hardening time in order to obtain good strengths Core box. In addition, the condensate is not stable in storage and gelatinizes after a short time Time.

Nach dem Verfahren der FR-PS 8 05 924 werden bei Siedehitze Phenol und Formaldehyd in saurem Medium oder nach Zugabe von Ammoniak, das sich mit dem Formaldehyd zu Hexamethylentetramin umsetzt und keine alkalische Reaktion im Ansatz gibt, bis zum Abklingen der exothermen Reaktion kondensiert. Dann wird dem so gebildeten Vorkondensat außer Äthylalkohol ein plastifizierender Äther oder ein entsprechender Alkohol wie Benzylalkohol und nach saurer Einstellung weitere Mengen Paraformaldehyd und danach portionsweise Harnstoff zugesetzt und auf ein in der Kälte festes Kondensat bei 100° C weiter kondensiert. Die für das Kondensat angestrebte Plastifizierung ist für eine Verwendung als Bindemittel für das Hot-Box-Verfahren unerwünscht. According to the process of FR-PS 8 05 924, phenol and formaldehyde are acidic at boiling point Medium or after the addition of ammonia, which reacts with the formaldehyde to form hexamethylenetetramine and there is no alkaline reaction in the batch, until the exothermic reaction has subsided. Then, in addition to ethyl alcohol, the precondensate thus formed becomes a plasticizing ether or a corresponding alcohol such as benzyl alcohol and, after acidic adjustment, additional amounts of paraformaldehyde and then urea added in portions and on a condensate that is solid in the cold 100 ° C further condensed. The plasticization aimed at for the condensate is for one use undesirable as a binder for the hot box process.

Es wurde nun überraschenderweise gefunden, daß die genannten Nachteile der bekannten Bindemittel für das Hot-Box-Verfahren auf der Basis eines Kondensates aus Harnstoff, Phenol und Formaldehyd und einem Härtemittel durch ein Bindemittel überwunden werden, das erhalten wird durch Kondensation von Harnstoff, Phenol und Formaldehyd im Molverhältnis 1:1: 3,5 bis 4,5 bei niedriger Temperatur im alkalischen Medium unter Bildung von Methylolgruppen und anschließende Verätherung bei pH 4,5 bis 5,5 und erhöhter Temperatur mit Isopropylalkohol oder mit einem Alkohol der allgemeinen Formel R—CH2—OH, in der R ein Wasserstoffatom, ein aliphatischer aromatischer oder heterocyclischer Rest ist, unter Anwendung von mindestens einem Mol Alkohol pro Mol Harnstoff.It has now surprisingly been found that the mentioned disadvantages of the known binders for the hot box process based on a condensate of urea, phenol and formaldehyde and a hardener are overcome by a binder obtained by condensation of urea, phenol and Formaldehyde in a molar ratio of 1: 1: 3.5 to 4.5 at low temperature in an alkaline medium with the formation of methylol groups and subsequent etherification at pH 4.5 to 5.5 and at an elevated temperature with isopropyl alcohol or with an alcohol of the general formula R— CH 2 —OH, in which R is a hydrogen atom, an aliphatic aromatic or heterocyclic radical, using at least one mole of alcohol per mole of urea.

Zur Verätherung des vorkondensierten Polymerisats können für die Zwecke der Erfindung z. B. folgende Alkohole verwendet werden: Äthanol, Methanol, Propanol und Butanol, sowie deren Isomere, Furfurylalkahol und Benzylalkohol. Als besonders vorteilhaft für die Zwecke der Erfindung hat sich Isopropylalkohol erwiesen.For the etherification of the precondensed polymer, for the purposes of the invention, for. B. the following Alcohols are used: ethanol, methanol, propanol and butanol, as well as their isomers, Furfuryl alcohol and benzyl alcohol. It has been found to be particularly advantageous for the purposes of the invention Isopropyl alcohol proved.

Für seine Verwendung für das Hot-Box-Verfahren wird dem erfindungsgemäßen Bindemittel als Härter z. B. Ammoniumchlorid, vorzugsweise in wäßriger Lösung zugesetzt.For its use for the hot box process, the binder according to the invention is used as a hardener z. B. ammonium chloride, preferably added in aqueous solution.

Das erfindungsgemäße Kondensat zeichnet sich durch eine große Reaktionsfreudigkeit und fehlende Geruchsbelästigung aus; außerdem ist es lagerbeständig, und seine Viskosität ändert sich nur sehr langsam. Es hat den weiteren Vorteil, daß sich mit ihm hergestellte Formen und Kerne dielektrisch trocknen lassen, und daß es auch für Säurehärtung bei Raumtemperatur allein und im Gemisch mit den hierfür üblichen Furanharzen geeignet ist. Als Säuren haben sich z. B. Phosphorsäure, organische Sulfonsäure wie Naphthalinsulfonsäure bewährt.The condensate according to the invention is characterized by a high degree of reactivity and lack of it Odor nuisance from; in addition, it is stable in storage and its viscosity changes only very slowly. It has the further advantage that molds and cores made with it dry dielectrically let, and that it is also suitable for acid curing at room temperature alone and in admixture with the for this purpose usual furan resins is suitable. As acids have z. B. phosphoric acid, organic sulfonic acid such as Proven naphthalenesulfonic acid.

Claims (2)

Patentansprüche:Patent claims: 1. Bindemittel für das Hot-Box-Verfahren, erhalten durch Kondensation von Harnstoff, Phenol und Formaldehyd im Molverhältnis 1 : 1 : 3,5 bis 4,5 bei niedriger Temperatur im alkalischen Medium unter Bildung von Methylolgruppen und anschließende Verätherung bei pH 4,5 bis 5,5 und erhöhter Temperatur mit Isopropylalkohol oder mit einem Alkohol der allgemeinen Formel R—CH2—OH, in der R ein Wasserstoffatom, ein aliphatischer, aromatischer oder heterocyclischer Rest ist, unter Anwendung von mindestens einem Mol Alkohol pro Mol Harn- *5 stoff.1. Binder for the hot box process, obtained by condensation of urea, phenol and formaldehyde in a molar ratio of 1: 1: 3.5 to 4.5 at a low temperature in an alkaline medium with the formation of methylol groups and subsequent etherification at pH 4, 5 to 5.5 and an elevated temperature with isopropyl alcohol or with an alcohol of the general formula R — CH 2 —OH, in which R is a hydrogen atom, an aliphatic, aromatic or heterocyclic radical, using at least one mole of alcohol per mole of urine. * 5 fabric. 2. Verwendung des Kondensats gemäß Anspruch 1 zusammen mit anderen üblichen Zusätzen als Bindemittel für das Hot-Box-Verfahren.2. Use of the condensate according to claim 1 together with other conventional additives as a binding agent for the hot box process.
DE19651569023 1965-02-13 1965-02-13 Binder for the hot box process Expired DE1569023C3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0055165 1965-02-13

Publications (3)

Publication Number Publication Date
DE1569023A1 DE1569023A1 (en) 1969-08-21
DE1569023B2 DE1569023B2 (en) 1976-05-06
DE1569023C3 true DE1569023C3 (en) 1981-08-20

Family

ID=7158941

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19651569023 Expired DE1569023C3 (en) 1965-02-13 1965-02-13 Binder for the hot box process

Country Status (1)

Country Link
DE (1) DE1569023C3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021037312A1 (en) 2019-08-30 2021-03-04 Bindur Gmbh Hot-curing mould material for producing cores and moulds in the sand casting process
WO2021037313A1 (en) 2019-08-30 2021-03-04 Bindur Gmbh Method for producing cores and molds in sand casting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5443292A (en) * 1977-09-12 1979-04-05 Unitika Ltd Etherified phenolic chelate resin* its production* and adsorption treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021037312A1 (en) 2019-08-30 2021-03-04 Bindur Gmbh Hot-curing mould material for producing cores and moulds in the sand casting process
WO2021037313A1 (en) 2019-08-30 2021-03-04 Bindur Gmbh Method for producing cores and molds in sand casting

Also Published As

Publication number Publication date
DE1569023B2 (en) 1976-05-06
DE1569023A1 (en) 1969-08-21

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
8339 Ceased/non-payment of the annual fee