DE528172C - Water-soluble core binder - Google Patents
Water-soluble core binderInfo
- Publication number
- DE528172C DE528172C DEM109625D DEM0109625D DE528172C DE 528172 C DE528172 C DE 528172C DE M109625 D DEM109625 D DE M109625D DE M0109625 D DEM0109625 D DE M0109625D DE 528172 C DE528172 C DE 528172C
- Authority
- DE
- Germany
- Prior art keywords
- pitch
- glycerine
- water
- sand
- adhesive
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
Wasserlösliches Kernbindemittel Wasserlösliche Kernbindemittel, also Klebstoffwasserlösungen. haben den Nachteil, daß sie im Sande sehr schnell verkrusten; ist die Klebstoffwasserlösung im Sande verteilt, so verdunstet das Wasser an der Luft sehr rasch, und nur der feste Klebstoff bleibt im Sande zurück. Der Sand ist nun verkrustet und kann nicht mehr zum Formen von Kernen benutzt werden, denn er hat seine Bildsamkeit verloren.Water-soluble core binders Water-soluble core binders, i.e. Adhesive water solutions. have the disadvantage that they crust in the sand very quickly; If the adhesive water solution is distributed in the sand, the water evaporates on the Air very quickly, and only the solid glue remains in the sand. The sand is now encrusted and can no longer be used to form cores because he has lost its plasticity.
Dieser Übelstand tritt besonders bei Quarzsand in Erscheinung, während er bei fetten Sanden (lehm- und tonhaltigen Erden) sich wenigei bemerkbar macht. Der poröse uarzsand begünstigt das Verdünsten des Wassers. Dieser Nachteil der zu schnellen Verdunstung des Wassergehaltes der im Sande, besonders im Quarzsande, verteilten Klebstoffwasserlösung tritt bei allen Klebstoffwasserlösungen auf.This disadvantage occurs especially with quartz sand while it is hardly noticeable in the case of fat sands (loamy and clayey soils). The porous uarzsand favors the evaporation of the water. This disadvantage of too rapid evaporation of the water content in the sand, especially in the quartz sand, Distributed adhesive water solution occurs with all adhesive water solutions.
Infolge dieses vorzeitigen Verkrustens des angemachten Sandes lassen sich Klebstoffwasserlösungen zur Formung von Quarzsandkernen nicht benutzen. Träte nicht vorzeitige Verkrustung ein, bliebe also der angemachte Sand genügend lange, mindestens einige Stunden, bildsam und modellierfähig, also verarbeitbar, so würden geeignete Klebstoffwasserlösungen für gewisse Kernbindezwecke brauchbar sein.As a result of this premature encrustation of the prepared sand, leave it Do not use adhesive water solutions to form quartz sand cores. Kicked no premature encrustation, so the prepared sand would stay long enough, at least a few hours, malleable and capable of being modeled, i.e. workable, that would be suitable adhesive water solutions may be useful for certain core binding purposes.
Die Erfindung beseitigt diese Nachteile der Klebstoffwasserlösungen und macht sie geeignet zur Formung von stehenden Quarzsandkernen, die sich für gewisse gießereitechnische Zwecke eignen. Der mit dem Bindemittel nach der Erfindung angemachte Quarzsand bleibt mehrere Stunden lang modellierfähig, also verarbeitbar.The invention overcomes these disadvantages of the adhesive water solutions and makes them suitable for the formation of standing quartz sand cores, which are suitable for certain suitable for foundry purposes. The one made with the binder according to the invention Quartz sand can be modeled, i.e. processed, for several hours.
Die Erfindung besteht darin, zu der Klebstoffwasserlösung Glycerinpech zuzusetzen. Glycerinpech ist wasserlöslich und wird von der Klebstoffwasserlösung vollkommen aufgenommen.The invention consists in adding glycerine pitch to the adhesive water solution to add. Glycerin pitch is water soluble and is made by the adhesive water solution completely absorbed.
Die außerordentliche Hygroskopizität des Glycerinpechs bewirkt, daß die mit einem Zusatz von Glycerinpech versehene Klebstoffwasserlösung nicht vorzeitig verkrustet, auch wenn sie im Sande verteilt ist.The extraordinary hygroscopicity of the glycerine pitch causes the adhesive water solution with an addition of glycerine pitch not prematurely encrusted, even if it is scattered in the sand.
Glycerinpech ist der einzige für diesen Zweck brauchbare Stoff; denn er ist der einzige stark hygroskopische Stoff, welcher die Adhäsionskraft der Klebstoffwasserlösung nicht schwächt, also die Bildsamkeit des Quarzsandes nicht verringert. Ja, vermöge seiner hohen Adhäsionskraft erhöht er sie noch erheblich. Andere hygroskopische Stoffe, z. B. Glycerin, würden die Adhäsionskraft der Klebstoffwasserlösung so stark herabsetzen, daß der Sand zu wenig bildsam würde.Glycerine pitch is the only substance that can be used for this purpose; because it is the only strongly hygroscopic substance that reduces the adhesive power of the adhesive water solution does not weaken, i.e. does not reduce the malleability of the quartz sand. Yes, be able Its high adhesive strength increases it considerably. Other hygroscopic Substances, e.g. B. glycerin, the adhesive force of the adhesive water solution would be so strong reduce the fact that the sand would not be too malleable.
Der Zusatz von Glycerinpech zu der Klebstoffwasserlösung hat außerdem den Vorteil, den Quarzsand erheblich bildsamer zu machen, so daß sich aus einer Klebstoffwasserlösung mit Zusatz von Glycerinpech kompliziertere Quarzsandkerne formen lassen als aus einer Klebstoffwasserlösung ohne Glycerinpech.The addition of glycerine pitch to the adhesive water solution also has the advantage of making the quartz sand considerably more malleable, so that one Adhesive water solution with the addition of glycerine pitch more complicated Forming quartz sand cores than from an adhesive water solution without glycerine pitch.
Endlich hat Glycerinpech die Eigenschaft, die Bindekraft. der Klebstoffwasserlösung durch Trocknen erheblich zu erhöhen. Sulfitlauge mit Zusatz von 15°1o Glycerinpech ergibt z. B. eine fünfmal so hohe Druckfestigkeit des getrockneten Kerns als Sulfitlauge allein.Finally, glycerine pitch has the property of binding power. the adhesive water solution to increase considerably by drying. Sulphite liquor with the addition of 15 ° 1o glycerine pitch z. B. five times as high compressive strength of the dried core as sulphite liquor alone.
Ein Zusatz von to bis 2o111, Glycerinpech genügt.An addition of to to 2o111, glycerine pitch is sufficient.
Klebstoffwasserlösungen, die bisher zum Formen von Quarzsandkernen allein unbrauchbar waren, werden durch einen bestimmten Zusatz von Glycerinpech für diesen Zweck brauchbar.Adhesive water solutions previously used for forming quartz sand cores alone were rendered useless by adding a certain amount of glycerine pitch useful for this purpose.
Die technischen Verwendungsmöglichkeiten von Klebstoffwasserlösungen werden also durch den Zusatz von Glycerinpech erheblich erweitert.The technical uses of adhesive water solutions are therefore considerably expanded by the addition of glycerine pitch.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM109625D DE528172C (en) | 1929-03-26 | 1929-03-26 | Water-soluble core binder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM109625D DE528172C (en) | 1929-03-26 | 1929-03-26 | Water-soluble core binder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE528172C true DE528172C (en) | 1931-06-26 |
Family
ID=7326753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEM109625D Expired DE528172C (en) | 1929-03-26 | 1929-03-26 | Water-soluble core binder |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE528172C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE970738C (en) * | 1943-12-16 | 1958-10-23 | Basf Ag | Core binder |
-
1929
- 1929-03-26 DE DEM109625D patent/DE528172C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE970738C (en) * | 1943-12-16 | 1958-10-23 | Basf Ag | Core binder |
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