DE102005009636A1 - Binding system, useful for sand molding based on hardenable acid resin component, comprises a nitrogenous compound as resin component and arylsulfonic acid as hardener - Google Patents
Binding system, useful for sand molding based on hardenable acid resin component, comprises a nitrogenous compound as resin component and arylsulfonic acid as hardener Download PDFInfo
- Publication number
- DE102005009636A1 DE102005009636A1 DE200510009636 DE102005009636A DE102005009636A1 DE 102005009636 A1 DE102005009636 A1 DE 102005009636A1 DE 200510009636 DE200510009636 DE 200510009636 DE 102005009636 A DE102005009636 A DE 102005009636A DE 102005009636 A1 DE102005009636 A1 DE 102005009636A1
- Authority
- DE
- Germany
- Prior art keywords
- resin
- resin component
- acid
- hardener
- binder system
- 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.)
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08L61/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09D161/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C09D161/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09D161/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C09D161/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
-
- 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
Abstract
Description
Die Erfindung bezieht sich auf ein Bindemittelsystem für Sandformen sowie auf ein Verfahren zum Herstellen einer Sandform, nach dem Oberbegriff des Patentanspruchs 1 bzw. 6.The This invention relates to a binder system for sand molds and to a method of making a sand mold after which Preamble of claim 1 or 6.
Aus
der
So
ist aus der
Aufgabe der Erfindung ist es, ein generatives 3D-Druckverfahren und ein hierfür geeignetes Bindemittelsystem der eingangs genannten Art zu schaffen, welches ein geringes Ausgasungsverhalten während des Gussvorgangs und zugleich eine hohe Festigkeit der mit dem Bindemittelsystem gefertigten Sandformen gewährleistet.task The invention is a generative 3D printing method and a therefor to provide a suitable binder system of the type mentioned, which has a low outgassing behavior during the casting process and at the same time high strength of the sand molds made with the binder system guaranteed.
Diese Aufgabe wird erfindungsgemäß durch das im Patentanspruch 1 gekennzeichnete Bindemittelsystem bzw. das im Patentanspruch 6 gekennzeichnete Verfahren gelöst.These The object is achieved by the characterized in claim 1 binder system or in the Claim 6 characterized solved method.
Grundlage der Erfindung ist die Erkenntnis, dass eine Festigkeitserhöhung durch Zugabe einer stickstoffhaltigen Verbindung nicht zwangsläufig mit einer erhöhten Ausgasung des Bindemittelsystems während des Abgusses verbunden ist, sondern sich das gussstörende Ausgasungsverhalten überraschenderweise durch eine Stickstoffzugabe zur säurehärtbaren Harzkomponente sogar noch signifikant verringern lässt, wenn der Stickstoffanteil an der Gesamtharzmenge innerhalb definierter Grenzen gehalten und zusätzlich ein spezieller Härter mit einem, bezogen auf die Harzmenge, ebenfalls begrenzten Gewichtsanteil verwendet wird, mit dem Ergebnis, dass die resultierenden Sandformen eine hohe Bruch- und Biegefestigkeit aufweisen und dennoch eine qualitativ hochwertige, von Porositäten und Lunkern weitgehend freie und maßgenaue Gussteilfertigung sicherstellen.basis The invention is the realization that an increase in strength by Addition of a nitrogen-containing compound is not necessarily with a increased Outgassing of the binder system connected during the casting is, but the cast-disturbing Outgassing behavior surprisingly by adding nitrogen to the acid-curable resin component even still significantly reduce, if the nitrogen content of the total amount of resin within defined Limits kept and in addition a special hardener with a, based on the amount of resin, also limited weight fraction is used, with the result that the resulting sand molds have a high breaking and bending strength and yet a high quality, largely of porosities and voids free and accurate to measure Ensure casting production.
Ein weiterer, vor allem in Verbindung mit dem generativen 3D-Druckverfahren wesentlicher Aspekt des erfindungsgemäßen Bindemittelsystems liegt in den verkürzten Reaktionszeiten und den sich daraus ergebenden, höheren Produktionsgeschwindigkeiten. Dabei wird der Formsand vorzugsweise mit dem Härter des Bindemittelsystems vorgemischt und das Sand/Härtergemisch schichtweise mit der stickstoffhaltig angereicherten Harzkomponente bedruckt, wodurch die Sandformfestigkeit nochmals gesteigert werden kann.One more, especially in connection with the generative 3D printing process essential aspect of the binder system according to the invention in the shortened Reaction times and the resulting, higher production speeds. The molding sand is preferably with the hardener of the binder system premixed and the sand / hardener mixture layer by layer with the nitrogen-containing enriched resin component printed, whereby the sand resistance are increased again can.
Eine besonders bevorzugte Ausgestaltung des erfindungsgemäßen Verfahrens betrifft die Reinigung des Druckkopfes: Während das generative 3D-Drucken mit einer durch eine stickstoffhaltige Verbindung, etwa Harnstoffharz, angereicherten Harzkomponente bisher zumeist daran scheiterte, dass die verstopfungsgefährdeten Druckerdüsen nicht oder nur mit unvertretbar großem Aufwand gereinigt werden konnten, lassen sich die Druckerdüsen von den Harzrückständen des erfindungsgemäßen Bindemittelsystems problemlos mit Hilfe eines aromatischen Alkohols, vorzugsweise Benzylalkohol, befreien.A particularly preferred embodiment of the method according to the invention concerns the cleaning of the printhead: During generative 3D printing with a nitrogen-containing compound, such as urea resin, enriched resin component so far mostly failed because the clog-prone printer nozzles not be cleaned or only with unreasonable effort could, the printer nozzles from the resin residues of the inventive binder system easily with the help of an aromatic alcohol, preferably benzyl alcohol, to free.
Als besonders vorteilhaft hat es sich erwiesen, als stickstoffhaltige Verbindung ein Harnstoffharz mit einem Gewichtsanteil an der Gesamtharzmenge von etwa 4% und als Härter Xylolsulfonsäure mit 30 bis 50 Gew.-%, bezogen auf das Gesamtharz, auszuwählen.When It has proven to be particularly advantageous as a nitrogen-containing Compound a urea resin with a weight fraction of the total amount of resin of about 4% and as a hardener Xylene sulfonic acid with 30 to 50 wt .-%, based on the total resin to select.
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels in Verbindung mit der Zeichnung näher beschrieben, in deren einziger Figur eine generative 3D-Druckanlage in stark schematisierter Darstellung gezeigt ist.The Invention will be described below with reference to an embodiment in connection closer to the drawing described in their only figure, a generative 3D printing system is shown in a highly schematic representation.
Die
in der Zeichnung gezeigte Druckanlage enthält einen Formsandbehälter
Der
Formsand und die Xylolsulfonsäure
werden zunächst
im einem Mischer
Im
Hinblick auf kurze Aushärtzeiten,
eine hohe Sandformfestigkeit und ein geringes Ausgasungsverhalten
der Sandform
Sehr
einfach ist auch die Druckkopfreinigung, da sich Rückstände des
Furfurylalkohol/Harnstoffharzgemisches mühelos mit Benzylalkohol aus den
Druckerdüsen
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005009636.0A DE102005009636B4 (en) | 2005-03-03 | 2005-03-03 | Method of generating a sand mold generatively |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005009636.0A DE102005009636B4 (en) | 2005-03-03 | 2005-03-03 | Method of generating a sand mold generatively |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102005009636A1 true DE102005009636A1 (en) | 2006-09-07 |
DE102005009636B4 DE102005009636B4 (en) | 2016-08-11 |
Family
ID=36848072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102005009636.0A Expired - Fee Related DE102005009636B4 (en) | 2005-03-03 | 2005-03-03 | Method of generating a sand mold generatively |
Country Status (1)
Country | Link |
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DE (1) | DE102005009636B4 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007110091A1 (en) * | 2006-03-25 | 2007-10-04 | Bayerische Motoren Werke Aktiengesellschaft | Binder system |
WO2014139491A1 (en) * | 2013-03-11 | 2014-09-18 | Universität Kassel | Generative method for producing a component having at least one channel by 3d printing by means of a sand and a binding agent |
CN108339929A (en) * | 2017-10-27 | 2018-07-31 | 柳州市柳晶科技股份有限公司 | A kind of forming and fixing agent and its preparation process and application |
CN110918878A (en) * | 2019-11-22 | 2020-03-27 | 郑州中兴三维科技有限公司 | 3D sand mould printing apparatus of quick replacement sand box |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2832869A1 (en) * | 1977-08-17 | 1979-03-08 | Quaker Oats Co | HARDLABLE BINDING AGENT FOR LARGE FOUNDRY SAND MOLDS AND PROCESS FOR MANUFACTURING SUCH MOLDS |
DE3624558A1 (en) * | 1985-07-29 | 1987-02-05 | Kao Quaker Co | Mould binder composition, and process for the production of a casting mould |
EP0540837B1 (en) * | 1991-11-07 | 1995-11-08 | Bakelite AG | Lignin modified binder |
DE19853834A1 (en) * | 1998-11-21 | 2000-05-31 | Ingo Ederer | Production of casting molds comprises depositing particulate material on support, applying binder and hardener to form solidified structure in selected region, and removing solidified structure |
WO2001072502A1 (en) * | 2000-03-24 | 2001-10-04 | Generis Gmbh | Method for manufacturing a structural part by deposition technique |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5932628A (en) * | 1994-08-19 | 1999-08-03 | Kao Corporation | Binder composition for production of molds and method of producing mold |
DE10136365A1 (en) * | 2001-07-26 | 2003-02-13 | Ashland Suedchemie Kernfest | Carbon dioxide curable binder system including a resol resin, an oxy anion, and a nitrogen containing compound useful for further curing by heat treatment after coating with dressing |
US7807077B2 (en) * | 2003-06-16 | 2010-10-05 | Voxeljet Technology Gmbh | Methods and systems for the manufacture of layered three-dimensional forms |
-
2005
- 2005-03-03 DE DE102005009636.0A patent/DE102005009636B4/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2832869A1 (en) * | 1977-08-17 | 1979-03-08 | Quaker Oats Co | HARDLABLE BINDING AGENT FOR LARGE FOUNDRY SAND MOLDS AND PROCESS FOR MANUFACTURING SUCH MOLDS |
DE3624558A1 (en) * | 1985-07-29 | 1987-02-05 | Kao Quaker Co | Mould binder composition, and process for the production of a casting mould |
EP0540837B1 (en) * | 1991-11-07 | 1995-11-08 | Bakelite AG | Lignin modified binder |
DE19853834A1 (en) * | 1998-11-21 | 2000-05-31 | Ingo Ederer | Production of casting molds comprises depositing particulate material on support, applying binder and hardener to form solidified structure in selected region, and removing solidified structure |
WO2001072502A1 (en) * | 2000-03-24 | 2001-10-04 | Generis Gmbh | Method for manufacturing a structural part by deposition technique |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007110091A1 (en) * | 2006-03-25 | 2007-10-04 | Bayerische Motoren Werke Aktiengesellschaft | Binder system |
WO2014139491A1 (en) * | 2013-03-11 | 2014-09-18 | Universität Kassel | Generative method for producing a component having at least one channel by 3d printing by means of a sand and a binding agent |
CN108339929A (en) * | 2017-10-27 | 2018-07-31 | 柳州市柳晶科技股份有限公司 | A kind of forming and fixing agent and its preparation process and application |
CN110918878A (en) * | 2019-11-22 | 2020-03-27 | 郑州中兴三维科技有限公司 | 3D sand mould printing apparatus of quick replacement sand box |
Also Published As
Publication number | Publication date |
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DE102005009636B4 (en) | 2016-08-11 |
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