DE1758977A1 - Foundry sand binders - Google Patents
Foundry sand bindersInfo
- Publication number
- DE1758977A1 DE1758977A1 DE19681758977 DE1758977A DE1758977A1 DE 1758977 A1 DE1758977 A1 DE 1758977A1 DE 19681758977 DE19681758977 DE 19681758977 DE 1758977 A DE1758977 A DE 1758977A DE 1758977 A1 DE1758977 A1 DE 1758977A1
- Authority
- DE
- Germany
- Prior art keywords
- foundry sand
- binders
- sand binders
- found
- mixtures
- 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
Gie#ereisand-Bindemittel Zusatz zu Patent...... (Anmeldung P 15 70 203. 1) Das Hauptpatent..... (Anmeldung P 15 70 203. 1) betrifft Bindemittel für die Herstellung von Formen und Kernen nach dem Hotbox-Verfahren, die unter Verwendung von Phenolen, Formaldehyd, Furfurylalkohol und geringen Mengen Harnstoff hergestellt waren und gekennzeichnet sind dadurch, da# eine überformalisierte konzentrierte Harnstofflösung unter Zugabe von k'urfurylalkohol, p-Formaldehyd und einem 2henol im alkalischen Medium in einem solchen Verhältnis zueinander kondensiert werden, daß im Endprodukt der Anteil an Furfurylalkohol bis zu 50s, vorzugsweise 10 bis 30%, das Molverhaltnis der phenolischen Komponente zum Gesamtformaldehydanteil im Bereich von 1 : 1,2 bis 1 : 1, 6 liegt und der Stickstoffgehalt im Endprodukt weniger als 3% beträgt.Casting sand binder additive to patent ...... (registration P 15 70 203. 1) The main patent ..... (Application P 15 70 203. 1) relates to binders for the production of molds and cores according to the hotbox process using made from phenols, formaldehyde, furfuryl alcohol and small amounts of urea goods and are characterized by the fact that # an over-formalized focused Urea solution with the addition of kurfuryl alcohol, p-formaldehyde and a phenol are condensed in an alkaline medium in such a ratio to each other, that in the end product the proportion of furfuryl alcohol up to 50s, preferably 10 to 30%, the molar ratio of the phenolic component to the total formaldehyde content in the The range is from 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 1. und 2 Gruppe des periodischen Systems, vorzugsweise der 2. Gruppe, und/oder organischen Aminen bzw. Aminoalkoholen bei einer Temperatur zwischen 50 und 110°C durchgefuhrt und dann das Reaktionswasser bis zum Erhalten einer Viskosität zwischen vorzugsweise 10 bis 70 P20o abdestilliert wird.A special embodiment of these binders is given by that the condensation in the pH range 7.2 to 10.0 by means of compounds with a basic reaction the elements of the 1st and 2nd group of the periodic table, preferably the 2nd group, and / or organic amines or amino alcohols at a temperature between 50 and 110 ° C and then the water of reaction until a viscosity is obtained between preferably 10 to 70 P20o is distilled off.
Es hat sich nun überraschenderweise herausgestellt, daß die oben beschriebenen Bindemittel ihre Vorzüge, namlich Gasporenfreiheit der mit ihnen eratellten Abgüsse und gute Oberflächenbeschaffenheit der mit ihnen erstellten Kerne und AbgUsee nicht nut bei Härtung nach dem Hotbox-Verfahren entfalten, sondern unter gewissen Bedingungen auch kalthärtbare Formstoffmischungen ergeben.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 good surface quality of the cores and AbgUsee created with them are not unfold only when hardening according to the hotbox process, but under certain conditions cold-curable molding mixtures also result.
Gem§ß der deutschen Patentechrift 880 467 ist es bekannt, Formstoffmischungen aus Sand, Polyester mit noch reaktionsfähigen Hydroxyl-, Sulfhydryl-oder Aminogruppen und Di-oder Polyisocyanate herzustellen, die bei niedrigen Temperaturen bereits aushärten.According to German patent specification 880 467, it is known to use molding material mixtures made of sand, polyester with still reactive hydroxyl, sulfhydryl or amino groups and to produce di- or polyisocyanates that are already at low temperatures Harden.
Es wurde gefunden, daß die gemäß der Anmeldung P 15 70 203. 1 hergestellten modifizierten Phenolresole mit einem Di-oder Polyisocyanat zusammen als Bizidersystem in einur Formstoffmischung bei Raumtemperatur arstttrrende Mischungen etgeben.It has been found that those produced according to application P 15 70 203.1 modified phenol resols with a di- or polyisocyanate together as a bicider system In a molding mixture at room temperature, give mixtures that are ready for use.
Es wurde weiter gefunden, da# sowohl die Lebenszeit umso kürzer und die Aushärtegeschwindigkeit um so größer sind, je mehr der Furfurylalkoholgehalt innerhalb der in der Anmeldung P 15 70 203. 1 angeführten Grenzen von 10-50% sich dem oberen Grenzwert nähert. Des weiteren wurde gefunden, da# die bekannten, die Urethanbildung aus Isocyanaten und polyhydroxylgruppenhalti#en Verbindungen regelnden Katalysatoren (vgl. Ind. Eng. Chem. 51 (1959) S. 1299) die Erhärtung der erfindungsgemäßen fhenolharz-Hombination zu regeln gestatten.It was further found that # both the lifetime and the shorter the more the furfuryl alcohol content, the greater the curing speed within the limits of 10-50% listed in application P 15 70 203.1 approaches the upper limit. It was also found that # the known, the Regulating urethane formation from isocyanates and compounds containing polyhydroxyl groups Catalysts (cf. Ind. Eng. Chem. 51 (1959) p. 1299) the hardening of the invention to regulate phenolic resin combination.
Beispielsweise härten Sandmischungen bestehend aus 100 Gew. Teilen Quarzsand H 32 0, 8 " " Harz A der Anmeldung F 15 70 203. 1 1,2 " " Diphenlmethandiisocyanat(techn.) inherhalb einer Stunde zu transportstabilen Formkörpern, uie ausgezeichnete Oberflächeneigenschaften gußseitig erg Diese Härtungsreaktion wird auf eine Zeit von einigen bekunden verkürzt und die kernseitig festzustellenten Festigkeitseigenschaften 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 Festikeitswerte ist durch den bekannten Zusatz von Silanderivaten, z.B. laut der Anmeldeschrift A 58 063 VIa/31b1 möglich.For example, sand mixtures consisting of 100 parts by weight harden Quartz sand H 32 0.8 "" Resin A of application F 15 70 203. 1 1.2 "" Diphenlmethane diisocyanate (techn.) within an hour to transport-stable moldings, uie excellent surface properties On the cast side, this hardening reaction is shortened for a few years and the strength properties to be determined on the core are significantly improved, if the catalyst in the journal Ind, Eng. Chem. Mentioned mainly alkaline substances, such as B. tertiary amines can be used. Further improvement the strength values are due to the well-known addition of silane derivatives, e.g. loud the registration form A 58 063 VIa / 31b1 possible.
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 true DE1758977A1 (en) | 1971-04-08 |
| DE1758977B2 DE1758977B2 (en) | 1976-11-11 |
| DE1758977C3 DE1758977C3 (en) | 1977-07-28 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| DE1758977B2 (en) | 1976-11-11 |
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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 |