DE1182779B - Self-solidifying core and molding sand binders for cast steel - Google Patents
Self-solidifying core and molding sand binders for cast steelInfo
- Publication number
- DE1182779B DE1182779B DER27095A DER0027095A DE1182779B DE 1182779 B DE1182779 B DE 1182779B DE R27095 A DER27095 A DE R27095A DE R0027095 A DER0027095 A DE R0027095A DE 1182779 B DE1182779 B DE 1182779B
- Authority
- DE
- Germany
- Prior art keywords
- self
- molding sand
- cast steel
- binders
- solidifying core
- 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
Links
- 239000011230 binding agent Substances 0.000 title claims description 14
- 239000003110 molding sand Substances 0.000 title description 5
- 229910001208 Crucible steel Inorganic materials 0.000 title description 3
- 150000001451 organic peroxides Chemical class 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000004014 plasticizer Substances 0.000 claims description 2
- 150000002432 hydroperoxides Chemical class 0.000 claims 1
- 150000007524 organic acids Chemical class 0.000 claims 1
- 235000005985 organic acids Nutrition 0.000 claims 1
- 238000001035 drying Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 235000019198 oils Nutrition 0.000 description 5
- 229920000180 alkyd Polymers 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UICXTANXZJJIBC-UHFFFAOYSA-N 1-(1-hydroperoxycyclohexyl)peroxycyclohexan-1-ol Chemical compound C1CCCCC1(O)OOC1(OO)CCCCC1 UICXTANXZJJIBC-UHFFFAOYSA-N 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- -1 Diolefin hydrocarbon Chemical class 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 235000021388 linseed oil Nutrition 0.000 description 1
- 239000000944 linseed oil Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 125000002081 peroxide group Chemical group 0.000 description 1
- 150000002978 peroxides Chemical group 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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
- B22C1/167—Mixtures of inorganic and organic binding agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Description
Selbsterstarrende Kern- und Formsandbindemittel für Stahlguß In der Hauptpatentanmeldung R 20890 V1 a / 31 c (deutsche Auslegeschrift 1173 213) sind Bindemittel für selbsterstarrende Kern- und Formsande beschrieben, welche aus 10 bis 50 Teilen eines trocknenden Öles bzw. eines Gemisches trochnender Öle, 90 bis 50 Teilen eines mit trocknenden Fettsäuren modifizierten Alkydharzes und 1 bis 5 Teilen einer metallhaltigen Trockenstofflösung bestehen und bei erhöhter Temperatur bis zu einer Viskosität von mindestens 75 Poisen bei 20° C verkocht sind.Self-solidifying core and molding sand binders for cast steel In the main patent application R 20890 V1 a / 31 c (German Auslegeschrift 1173 213) binders for self-solidifying core and molding sands are described, which are made from 10 to 50 parts of a drying oil or a mixture of drying oils, 90 consist of up to 50 parts of an alkyd resin modified with drying fatty acids and 1 to 5 parts of a metal-containing desiccant solution and boiled off at an elevated temperature to a viscosity of at least 75 poises at 20 ° C.
Derartige Bindemittel haben sich in der Praxis, vor allem bei hochlegiertem Stahlguß, hervorragend bewährt. Sie lassen sich im Gegensatz zu den bisher verwendeten sogenannten Erstarrungskernölen, welche aus eingedickten trocknenden Ölen und Sikkativen bestehen, auch in Gegenwart von plastifizierenden Stoffen, wie Formsand oder Bentonit, und Wasser einwandfrei zur Lufthärtung bringen. Mit Hilfe derartiger Bindemittel hergestellte Kerne und Formen bedürfen keiner Ofentrocknuäg, sondern lassen sich ohne weiteres lufttrocken vergießen.Such binders have proven themselves in practice, especially in the case of high-alloyed ones Cast steel, well proven. In contrast to the previously used so-called solidification kernel oils, which are made from thickened drying oils and siccatives exist, even in the presence of plasticizing substances such as molding sand or bentonite, and bring water to air harden properly. With the help of such binders Manufactured cores and molds do not require oven drying, but can be potted air dry without further ado.
Die genannten Bindemittel zeigen allerdings einen Nachteil, welcher durch ihren hohen Gehalt an Alkydharzen bedingt ist: Sie trocknen relativ langsam durch. Bei sehr voluminösen Kernen und Formen kann sich dies in der Praxis mitunter unangenehm bemerkbar machen. Versuche, die Durchtrocknung durch erhöhten Zusatz von öllöslichen Bleisalzen zu fördern, welche sich sonst bei trocknenden ölen sehr gut bewähren, scheitern daran, daß sich ölunlösliche Bleisalze der während des Kochvorgangs aus dem Alkydharz abgespalteten Phthalsäure bilden, welche sehr rasch ausfallen und für den Vorgang der Durchtrocknung völlig wirkungslos sind.The binders mentioned, however, have one disadvantage, which is due to their high alkyd resin content: They dry relatively slowly by. With very voluminous cores and shapes, this can sometimes happen in practice make them uncomfortable. Try to dry out through increased additive to promote oil-soluble lead salts, which are otherwise very good with drying oils Proven well, fail because oil-insoluble lead salts form during the cooking process form phthalic acid split off from the alkyd resin, which precipitate very quickly and are completely ineffective for the process of through-drying.
Durch den Zusatz von ölunlöslichen, anorganischen Stoffen, welche die Peroxydgruppe enthalten, zum Kern- und Formsand läßt sich bekanntlich die Durchtrocknung wesentlich beschleunigen. Leider wird aber auch der Beginn der Trocknung so weit vorverlegt, daß eine einwandfreie Verarbeitung der Sandmischungen nicht mehr gewährleistet ist, d. h., es kann vorkommen, daß bereits weitgehend abgebundene Sandmischungen verformt werden. Außerdem zeigen derart hergestellte Formen und Kerne eine gewisse Sprödigkeit, welche um so stärker ist, je schneller die Durchtrocknung verläuft. Diese Sprödigkeit stört vor allem beim Brechen der Kernkanten und beim Einschneiden von Läufen u. dgl. in die lufttrockenen Formen.Through the addition of oil-insoluble, inorganic substances, which contain the peroxide group, as is well known, thorough drying can be used for core and molding sand accelerate significantly. Unfortunately, the beginning of the drying process is also getting this far brought forward so that proper processing of the sand mixtures is no longer guaranteed is, d. That is, it can happen that sand mixtures that have already largely set be deformed. In addition, molds and cores produced in this way show a certain amount Brittleness, which is the greater the faster the drying process. This brittleness is particularly troublesome when breaking the core edges and when cutting into them from runs and the like into the air-dry forms.
Es wurde auch schon vorgeschlagen, Bindemitteln auf der Basis von Diolefin-Kohlenwasserstoff-Polymerisationsprodukten, welche zusammen mit kleineren Mengen sikkativieritem Leinölfirnss verwendet werden, kleine Mengen an öllöslichen organischen Peroxyden, vorzugsweise Benzoylperoxyd, zuzusetzen. Abgesehen von der sehr schlechten Löslichkeit organischer Peroxyde in Alkydharzbindemitteln tritt auch hierbei wieder eine starke Versprödung ein.It has also been proposed to use binders based on Diolefin hydrocarbon polymerization products, which together with smaller Quantities of siccative linseed oil are used, small quantities of oil-soluble ones organic peroxides, preferably benzoyl peroxide, to be added. Apart from the very poor solubility of organic peroxides in alkyd resin binders occurs here again a strong embrittlement.
Die genannten Nachteile kann man nach dem erfindungsgemäßen Vorgehen dadurch beseitigen, daß man die Bindemittel nach der Hauptpatentanmeldung anschließend an die Verkochung, nach Abkühlen unter 100° C mit 0,5 bis 5'% einer Lösung oder Paste eines geeigneten organischen Peroxyds oder Hydroperoxyds in einem Weichmacher, vorzugsweise auf der Basis mehrwertiger Carbonsäuren und einwertiger Alkohole, vermischt. Die Konzentration der Paste oder Lösung kann innerhalb weiter Grenzen variieren. Beispiel 1 100 Gewichtsteile Bindemittel aus Beispiel l der Hauptpatentanmeldung werden mit 0,8 Gewichtsteilen einer 50%igen Cyclohexanonperoxydpaste in Dibutylphthalat versetzt.The disadvantages mentioned can be avoided by the procedure according to the invention by eliminating that one then the binders after the main patent application to boiling, after cooling below 100 ° C with 0.5 to 5% of a solution or Paste of a suitable organic peroxide or hydroperoxide in a plasticizer, preferably based on polybasic carboxylic acids and monohydric alcohols, mixed. The concentration of the paste or solution can vary within wide limits. Example 1 100 parts by weight of binder from Example 1 of the main patent application are with 0.8 parts by weight of a 50% cyclohexanone peroxide paste in dibutyl phthalate offset.
Eine Sandmischung, bestehend aus 70 Gewichtsteilen Frecherer Quarzsand F 32, 30 Gewichtsteilen Rosenthaler Formsand, mittelfett, 3 Gewichtsteilen Bindemittel, wie oben beschrieben, und 1 Gewichtsteil Wasser, wurde zu den üblichen »GF«-Prüfzylindem verformt. Die Scherfestigkeit, betrug nach 4 Stunden Lufttrocknung (22° C, 60 a/o Luftfeuchtigkeit) 5,5 kg/cmE.A sand mixture consisting of 70 parts by weight of Frecherer quartz sand F 32, 30 parts by weight of Rosenthaler molding sand, medium fat, 3 parts by weight of binder, as described above, and 1 part by weight of water, became the usual "GF" test cylinders deformed. The shear strength was after 4 hours of air drying (22 ° C, 60 a / o humidity) 5.5 kg / cmE.
Dieselbe Mischung, bei der das Bindemittel jedoch keine Peroxydpaste enthielt, zeigte unter gleichen Bedingungen eine Festigkeit von 1,2 kg/cm$. Beispiel 2 100 Gewichtsteile Bindemittel aus Beispiel 1' der Hauptpatentanmeldung werden mit 3,5% einer 251/eigen Lösung von tert.-Butyl-hydroperoxyd vermischt. Es wird eine Sandmischung wie im Beispiel 1 verwendet.The same mixture in which the binder is not peroxide paste showed a strength of 1.2 kg / cm $ under the same conditions. example 2 100 parts by weight of binder from Example 1 'of the main patent application mixed with 3.5% of a 251 / own solution of tert-butyl hydroperoxide. It will a sand mixture as in Example 1 was used.
Die Scherfestigkeit nach 4 Stunden beträgt 10,0 kg7cmz. Die Kerne zeigen keinerlei Sprödigkeit und lassen sich sehr, gut schneiden.The shear strength after 4 hours is 10.0 kg7cmz. The cores show no brittleness and can be cut very, well.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DER27095A DE1182779B (en) | 1960-01-13 | 1960-01-13 | Self-solidifying core and molding sand binders for cast steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DER27095A DE1182779B (en) | 1960-01-13 | 1960-01-13 | Self-solidifying core and molding sand binders for cast steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1182779B true DE1182779B (en) | 1964-12-03 |
Family
ID=7402369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DER27095A Pending DE1182779B (en) | 1960-01-13 | 1960-01-13 | Self-solidifying core and molding sand binders for cast steel |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1182779B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1299373B (en) * | 1967-04-21 | 1969-07-17 | D F Raschig Gmbh | Core and molding sand binders with high thermal loads |
| US4385656A (en) * | 1978-12-20 | 1983-05-31 | Kuraray Company, Ltd. | Method of manufacturing foundry sand molds |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE831442C (en) * | 1944-07-05 | 1952-02-14 | Albertuswerke G M B H | Process for the production of solidification cores |
-
1960
- 1960-01-13 DE DER27095A patent/DE1182779B/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE831442C (en) * | 1944-07-05 | 1952-02-14 | Albertuswerke G M B H | Process for the production of solidification cores |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1299373B (en) * | 1967-04-21 | 1969-07-17 | D F Raschig Gmbh | Core and molding sand binders with high thermal loads |
| US4385656A (en) * | 1978-12-20 | 1983-05-31 | Kuraray Company, Ltd. | Method of manufacturing foundry sand molds |
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