DE1433931A1 - Core and foundry sand binders - Google Patents

Core and foundry sand binders

Info

Publication number
DE1433931A1
DE1433931A1 DE19631433931 DE1433931A DE1433931A1 DE 1433931 A1 DE1433931 A1 DE 1433931A1 DE 19631433931 DE19631433931 DE 19631433931 DE 1433931 A DE1433931 A DE 1433931A DE 1433931 A1 DE1433931 A1 DE 1433931A1
Authority
DE
Germany
Prior art keywords
core
foundry sand
binders
water
sand binders
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
DE19631433931
Other languages
German (de)
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.)
ALBERTUSWERKE GmbH
Original Assignee
ALBERTUSWERKE 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 ALBERTUSWERKE GmbH filed Critical ALBERTUSWERKE GmbH
Publication of DE1433931A1 publication Critical patent/DE1433931A1/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
    • B22C1/26—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 carbohydrates; of distillation residues therefrom
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Saccharide Compounds (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Description

Kern- und Fornisandbindemittel Die Verwendung furfurylalkohol-modifizierter Harnstoffharze (im folgenden Furanharze genannt) als Bindemittel für Gieiierei kerne und -formen wurde bereits beschrieben.Core and Fornisand binders The use of furfuryl alcohol-modified Urea resins (hereinafter referred to as furan resins) as binders for foundry egg cores and shapes have already been described.

Reaktive Furarinarze dieser Art besitzen - je nach der Kondensationsführung - ein mehr oder weniger schnelles und temperaturabhängiges Abbinde- und Härtungsvermögen in der Sandmischung, vor allem innerhalb der ersten Stunden nach erfolgter Zugabe eines sauren Härters. Die auf bekannte Weise nach diesem Verfahren gehärteten Kerne besitzen jedoch eine starre, spröde Struktur.Have reactive furarin ores of this type - depending on the condensation process - a more or less rapid and temperature-dependent setting and hardening capacity in the sand mixture, especially within the first few hours after the addition an acid hardener. The cores hardened in a known manner by this process however, have a rigid, brittle structure.

Diese, in der Praxis oft als nachteilig empfundene Eigenschaft setzt der Anwendung des genannten Verfahrens bestimmte Grenzen. So ist z.B. für die Herstellung komplizierter Formen und Kerne mit geringen Modell-Schrägen, besonders bei hohen Rippenkonturen, eine starrspröde Kern- bzw. Formstruktur unbrauchbar. Dieser Nachteil wird durch die Erfindung überwunden.This property, which is often perceived as disadvantageous in practice, is set there are certain limits to the application of the procedure mentioned. So is e.g. for the production complicated shapes and cores with low model bevels, especially high ones Rib contours, a rigid, brittle core or form structure useless. This disadvantage is overcome by the invention.

Erfindungsgemäss wird eine elastische Struktur der Formlinge ohne Veränderung der Härtezeiten dadurch erzielt, dass den Harzen gewisse wasserlösliche Kohlenhydrate zugesetzt werden. Der Zusatz kann während oder nach der Kondensation des Furanharzes erfolgen. Die neuen Bindemittel können zur Herstellung von Kernen und Formen auf dem Wege der Kalthärtung oder Härtung in heißen KernbE.chsen verwendet werden. Es wurde weiter festgestellt, dass solche Zusätze sich günstig auf eine Stabilisierung der Furanharze in Bezug auf Lagerfähigkeit auswirken können.According to the invention, an elastic structure of the moldings is without Change in the hardening times achieved by making the resins certain water-soluble Carbohydrates are added. The addition can be made during or after the condensation of the furan resin. The new binders can be used to manufacture cores and molds by way of cold hardening or hardening in hot core tubes will. It was further found that such additives are beneficial can have an effect on the stabilization of the furan resins in terms of shelf life.

Brauchbar für die Erfindung sind die wasserlöslichen Mono- und Polysaccharide. Als besonders geeignete Kohlenhydrate erwiesen sich PIonosen wie Dextrose, Biosen wie Rübenzucker und Verzuckerungsprodukte von Stärke mit einem Gehalt an Polyosen, welche auch in Form ihrer Sirupe verwendet werden können. Dieser Zusatz kann, bezogen auf das -Endprodukt, bis zu 40 % betragen und ist in Mengen,-)von-enigen wenigen j ab bereits wirksam. Er kann sowohl in trockener Form dem Harzansatz eingemischt werden, als auch in Form einer geeigneten Lösung.The water-soluble mono- and polysaccharides are useful for the invention. Ionoses such as dextrose and biosene have proven to be particularly suitable carbohydrates such as beet sugar and saccharification products of starch with a content of polyoses, which can also be used in the form of their syrups. This addition can be related on the end product, up to 40% and is in quantities, -) from a few j from already effective. It can be mixed with the resin mixture in dry form as well as in the form of a suitable solution.

Claims (1)

Pate iitanspri.ichP. 1. Verwendunb Von Furanharzen enthaltenden Kern- und Forinsandbi ndemi tteln, g e k e n n z e i c h n e t durch einen Gehalt an wasserlöslichen Kohlenhydraten. Verwendung eines Bindemittels nach Anspruch 1, dadurch g e k e n n z e i c h n e t, dass es als wasserlösliche Kohlenhydrate bis zu 40% Monƒsen wie Dextrose, Biosen wie Rübenzucker und Zlerzuckerungsprodukte N.nii Sthrke mit einem Gehalt an Polyosen, welche auch in I orm ihrer Sirupe verwendet werden können, enthält.Godfather iitanspri.ichP. 1. Use of core materials containing furan resins and Forinsandbi ndemi tteln, g e k e n n n z i n e t due to a content of water-soluble Carbohydrates. Use of a binder according to Claim 1, characterized in that it is It is noted that it is water-soluble carbohydrates up to 40% Monƒsen such as dextrose, bios such as beet sugar and sugar products with N.nii starch a content of polyoses, which can also be used in your syrups, contains.
DE19631433931 1963-03-20 1963-03-20 Core and foundry sand binders Pending DE1433931A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA0042651 1963-03-20

Publications (1)

Publication Number Publication Date
DE1433931A1 true DE1433931A1 (en) 1968-11-21

Family

ID=6933214

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19631433931 Pending DE1433931A1 (en) 1963-03-20 1963-03-20 Core and foundry sand binders

Country Status (1)

Country Link
DE (1) DE1433931A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057934A1 (en) * 1981-02-11 1982-08-18 Maizena Gesellschaft mbH Furan resin binder for foundry moulding and core sand

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057934A1 (en) * 1981-02-11 1982-08-18 Maizena Gesellschaft mbH Furan resin binder for foundry moulding and core sand

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