DE1758977B2 - USE OF BINDERS FOR THE PRODUCTION OF COLD CURING MOLDING MATERIAL - Google Patents
USE OF BINDERS FOR THE PRODUCTION OF COLD CURING MOLDING MATERIALInfo
- Publication number
- DE1758977B2 DE1758977B2 DE19681758977 DE1758977A DE1758977B2 DE 1758977 B2 DE1758977 B2 DE 1758977B2 DE 19681758977 DE19681758977 DE 19681758977 DE 1758977 A DE1758977 A DE 1758977A DE 1758977 B2 DE1758977 B2 DE 1758977B2
- Authority
- DE
- Germany
- Prior art keywords
- molding material
- production
- binders
- curing molding
- furfuryl alcohol
- 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.)
- Granted
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
- B22C1/2273—Polyurethanes; Polyisocyanates
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/54—Polycondensates of aldehydes
- C08G18/542—Polycondensates of aldehydes with phenols
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)
- Mold Materials And Core Materials (AREA)
Description
Das Hauptpatent 15 70 203 betrifft Bindemittel für die Herstellung von Formen und Kernen nach dem Hotbox-Verfahren, die dadurch gekennzeichnet sind, daß eine überformalisierte konzentrierte Harnstoff lösung unter Zugabe von Furfurylalkohol, Paraformaldehyd und einem Phenol im alkalischen Medium mittels basisch reagierender Verbindungen der Elemente der I. und II. Gruppe des periodischen Systems und/oder organischen Aminen bzw. Aminoalkoholen bei einer Temperatur zwischen 50 und HO0C in einem solchen Verhältnis zueinander kondensiert worden ist und das Reaktionswasser bis zum Erhalten einer Viskosität zwischen 10 bis 70P20° abdestilliert worden ist, so daß im Endprodukt der Anteil an Furfurylalkohol bis zu 50% das Molverhältnis der phenolischen Komponente zum Gesamtformaldehydanteil im Bereich 1 : 1,2 bis 1 : 1,6 liegt und der Stickstoffgehalt im Endprodukt weniger als 3% beträgt.The main patent 15 70 203 relates to binders for the production of molds and cores by the hotbox process, which are characterized in that an over-formalized concentrated urea solution with the addition of furfuryl alcohol, paraformaldehyde and a phenol in an alkaline medium by means of basic compounds of the elements I. and II. Group of the periodic table and / or organic amines or amino alcohols have been condensed at a temperature between 50 and HO 0 C in such a ratio to each other and the water of reaction has been distilled off until a viscosity between 10 to 70P 20 ° is obtained is, so that the proportion of furfuryl alcohol in the end product is up to 50%, the molar ratio of the phenolic component to the total formaldehyde content is in the range 1: 1.2 to 1: 1.6 and the nitrogen content in the end product is less than 3%.
Eine besondere Ausführungsart dieser Bindemittel ist dadurch gegeben, daß die Kondensation im pH-Bereich 7,2 bis 10,0 mittels basisch reagierender Verbindungen der Elemente der I. und II. Gruppe des periodischen Systems und/oder organischen Aminen bzw. Aminoalkoholen bei einer Temperatur zwischen 50 und 1100C durchgeführt und dann das Reaktionswasser bis zum Erhalten einer Viskosität zwischen 10 bis 7OP2O» abdestilliert wird.A special embodiment of these binders is that the condensation in the pH range 7.2 to 10.0 by means of basic compounds of the elements of groups I and II of the periodic table and / or organic amines or amino alcohols at one temperature between 50 and 110 0 C, and then the reaction water until obtaining a viscosity of between 10 to 2O 7OP »is distilled off.
Es hat sich nun überraschenderweise herausgestellt, daß die oben beschriebenen Bindemittel ihre Vorzüge, nämlich Gasporenfreiheit der mit ihnen erstellten Abgüsse und gute Oberflächenbeschaffenheit der mit ihnen erstellten Kerne und Abgüsse nicht nur bei Härtung nach dem Hotbox-Verfahren entfalten, sondern in Verbindung mit Di- oder Polyisocyanaten und üblichen, die Urethanbildung regelnden Zusätzen auch zur Herstellung von kalthärtenden Formstoffmischungen verwendet werden können.It has now surprisingly been found that the above-described binders have their advantages namely the absence of gas pores in the casts made with them and the good surface quality of the with The cores and casts created for them not only unfold when hardened according to the hotbox process, but also in connection with di- or polyisocyanates and the usual additives that regulate urethane formation can be used for the production of cold-curing molding mixtures.
Aus der DT-PS 880467 ist es bekannt, Formstoffmischungen aus Sand, Polyester mit noch reaktionsfähigen Hydroxyl-, Sulfhydryl- oder Aminogruppen und Di- oder Polyisocyanaten herzustellen, die bei niedrigen Temperaturen bereits aushärten.From DT-PS 880467 it is known, molding material mixtures made of sand, polyester with still reactive hydroxyl, sulfhydryl or amino groups and to produce di- or polyisocyanates that cure at low temperatures.
Aus der FR-PS15 33 024 ist es bekannt, beliebige, jedoch im wesentlichen wasserfreie Phenolharze zusammen mit Polyisocyanaten als kalthärtende Binder für Gießereiformmassen zu verwenden. Im Gegensatz dazu ist das erfindungsgemäß zu verwendende Harz entsprechend Patent 1570203 ein modifiziertes, aber nicht veräthertes, wasserhaltiges Phenolresol.From FR-PS15 33 024 it is known to use any but essentially anhydrous phenolic resins together with polyisocyanates as cold-curing binders to be used for foundry molding compounds. In contrast, the resin to be used in the present invention is according to patent 1570203 a modified, but not etherified, water-containing phenol resol.
Die Lebenszeit der Formstoffgemische ist um so kürzerund ihre Aushärtegeschwindigkeit um so größer, je mehr der Furfurylalkoholgehalt innerhalb der angegebenen Grenze von 10-50% sich dem oberen Grenzwert nähert. Die bekannten, die Urethanbildung aus Isocyanaten und polyhydroxylgruppenhaltigen Verbindungen regelnden Katalysatoren (vgl. Ind. Eng. Chem. 51 [1959] S. 1299) erlauben es, die Erhärtung der Formstoffgemischö zu regeln.The lifetime of the molding material mixture is shorter and the speed at which it cures, the faster the more the furfuryl alcohol content within the specified limit of 10-50% differs from the upper one Limit value is approaching. The well-known urethane formation from isocyanates and compounds containing polyhydroxyl groups regulating catalysts (cf. Ind. Eng. Chem. 51 [1959] p. 1299) allow the hardening of the To regulate molding material mixture.
Beispielsweise härten Sandmischungen bestehend ausFor example, sand mixtures consisting of harden
100 Gew.-Teilen Quarzsand H 32,100 parts by weight quartz sand H 32,
0,8 Gew.-Teilen Harz A des Hauptpatents 1570203 (aus m-Kresol, Furfurylalkoholgehalt
20%, Stickstoffgehalt 1,5%, Molverhältnis Kresol zu Gesamtformaldehyd 1:1,5,
Viskosität 30 bis 40 P20o)0.8 part by weight of resin A of main patent 1570203 (from m-cresol, furfuryl alcohol content 20%, nitrogen content 1.5%, molar ratio of cresol to total formaldehyde 1: 1.5,
Viscosity 30 to 40 P 20 o)
1,2 Gew.-Teilen Diphenylmethandiisocyanat
(techn.)1.2 parts by weight of diphenylmethane diisocyanate
(techn.)
innerhalb einer Stunde zu transportstabilen Formkörpern, die ausgezeichnete Oberflächeneigenschaften gußseitig ergeben. Diese Härtungsreaktion wird auf eine Zeit von einigen Sekunden verkürzt und die kernseitig festzustellenden Festigkeitseigenschaften werden noch erheblich verbessert, wenn als Katalysator die in der Zeitschrift Ind. Eng. Chem. erwähnten vorwiegend alkalischen Stoffe, wie z.B. tertiäre Amine, verwendet werden. Weitere Verbesserung der Festigkeitswerte ist durch den bekannten Zusatz von Silanderivaten, z.B. gemäß DT-OS 1608038 möglich.within an hour to transport-stable moldings with excellent surface properties result on the casting side. This hardening reaction is shortened to a time of a few seconds and on the core side The strength properties to be determined are significantly improved when used as a catalyst in the journal Ind. Eng. Chem. Mentioned mainly alkaline substances, such as tertiary amines, be used. Further improvement of the strength values is due to the well-known addition of silane derivatives, e.g. possible according to DT-OS 1608038.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681758977 DE1758977C3 (en) | 1968-09-11 | Use of binders for the production of cold-curing molding material mixtures |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681758977 DE1758977C3 (en) | 1968-09-11 | Use of binders for the production of cold-curing molding material mixtures |
Publications (3)
Publication Number | Publication Date |
---|---|
DE1758977A1 DE1758977A1 (en) | 1971-04-08 |
DE1758977B2 true DE1758977B2 (en) | 1976-11-11 |
DE1758977C3 DE1758977C3 (en) | 1977-07-28 |
Family
ID=
Also Published As
Publication number | Publication date |
---|---|
DE1758977A1 (en) | 1971-04-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
E77 | Valid patent as to the heymanns-index 1977 | ||
8340 | Patent of addition ceased/non-payment of fee of main patent |