DE2312016A1 - Rapidly curing cast resin mouldings - by additionally heating at a localised spot - Google Patents
Rapidly curing cast resin mouldings - by additionally heating at a localised spotInfo
- Publication number
- DE2312016A1 DE2312016A1 DE19732312016 DE2312016A DE2312016A1 DE 2312016 A1 DE2312016 A1 DE 2312016A1 DE 19732312016 DE19732312016 DE 19732312016 DE 2312016 A DE2312016 A DE 2312016A DE 2312016 A1 DE2312016 A1 DE 2312016A1
- Authority
- DE
- Germany
- Prior art keywords
- point
- high temperature
- cast resin
- heated
- mould
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/38—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Verfahren und Einrichtung zur Herstellung von Formkörpern aus hochreaktiv exotherm vernetzenden Gießharzmassen Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung von Formkörpern aus hochreaktiv exotherm vernetzenden Qießharzmassen, die in beheizte Formen ausgegossen werden. Process and device for the production of moldings from highly reactive Exothermically Crosslinking Cast Resin Compounds The invention relates to a method and a Device for the production of moldings from highly reactive exothermic crosslinking Resin compounds that are poured into heated molds.
Die vorgenannten Gießharze zeichnen sich dadurch aus, daß sie eine längere Zeit, z. B. 12 Std., im vergußfertigen Zustand bei normaler Raumtemperatur verweilen können ( lange1TopfzeitIt ) und sich bei einer Temperaturerhöhung um ca. 1000 C in wenigen Minuten reaktiv durch eine intensive Härtereaktion soweit verfestigen, daß sie ausgeformt werden können. Hierbei ist zur Verhinderung des Reaktionsschwundes die Anwendung von Druck auf die Gießharzmasse nach Einfüllen in die - in der Regel vorbeheizte -Form zweckmäßig. Solche Verfahren sind in einer Veröffentlichung D 94 - 742/60509 #1 Lekutherm X t' Ausgabe 1. 1. 72 der Fa. Bayer sowie in der Druckschrift Nr. 39 ~ Anwendungsbeispiele für Araldit ~ der Fa. Ciba - Geigy, Basel vom September 1971 beschrieben.The aforementioned casting resins are distinguished by the fact that they have a longer time, e.g. B. 12 hours, in the ready-to-cast state at normal room temperature can linger (long pot life) and when the temperature rises by approx. 1000 C reactive in a few minutes through an intensive hardening reaction to the extent that that they can be shaped. This is to prevent the reaction loss the application of pressure on the cast resin compound after pouring it into the - usually preheated -form useful. Such methods are in a publication D 94 - 742/60509 # 1 Lekutherm X t 'Issue 1. 1. 72 from Bayer and in the publication No. 39 ~ Application examples for Araldit ~ from Ciba-Geigy, Basel from the September 1971.
Die Höhe der zu wählenden Härtetemperatur ist nicht beliebig frei wählbar, sondern mit Rücksicht auf die angestrebte Qualität des Gusses nach oben#begrenzt. Erhöht man diese zu stark, so härtet das Harz zwar noch rascher, man muß jedoch dafür u. U. Spannungen im Harz hinnehmen, die nach der vollständigen Aushärtung zu Rissen im Gußkörper führen.The level of the hardening temperature to be selected is not freely selectable selectable, but limited upwards with regard to the desired quality of the casting. If you increase this too much, the resin hardens even more quickly, but you have to for this, if necessary, accept tensions in the resin that occur after complete curing lead to cracks in the cast body.
Es ist wünschenswert, insbesondere bei Gießlingen für Hochspannungsschaltanlagen aus Epoxydharzen, Polyurethan - und ungesättigten Polyestergießharzen, die Härtungsreaktion zu steuern, um einen lunkerfreien Körper hoher Güte zu erhalten. Dazu ist bei exotherm reagierenden Gießharzsystemen ganz allgemein bekannt, die Härtungsreaktion durch örtliches Kühlen bzw. Erhitzen der Gießmasse zu steuern, um einen räumlich - zeitlichen Ablauf im gewünschten Sinne zu erhalten. Bei dem vorgenannten hochreaktiven Systemen stößt man jedoch angesichts der extrem kurzen Reaktionszeit auf Schwierigkeiten.It is desirable, especially in castings for high voltage switchgear from epoxy resins, polyurethane - and unsaturated polyester casting resins, the hardening reaction to control in order to obtain a void-free body of high quality. To do this, at exothermic reactive casting resin systems are generally known to cause the hardening reaction to control local cooling or heating of the casting compound in order to achieve a spatial - temporal To get the flow in the desired sense. In the aforementioned highly reactive systems However, difficulties arise in view of the extremely short response time.
Einmal müßte bei Anwendung des bekannten Verfahrens die mittlere Verarbeitungstemperatur gesenkt werden, d. h., daß die Formenbelegungszeit steigt und ein wesentlicher wirtschaftlicher Vorteil der Anwendung von hochreaktiven Harzen verlorerginge. Zum anderen werden aufwendige Isolierungen und Heizsysteme an den Formen notwendig, um das notwendige Temperaturgefälle zu gewährleisten.Once the average processing temperature would have to be used when using the known method be lowered, d. This means that the mold occupancy time increases and is significantly more economical The advantage of using highly reactive resins would be lost. To be another Elaborate insulation and heating systems on the molds are necessary to achieve the necessary To ensure temperature gradient.
Die Aufgabe der Erfindung ist es, bei der Anwendung der eingangs genannten hochreaktiven Gießharzmassen, unter Beibehaltung der günstigsten Härtetemperatur, die Aushärtung des Harzes dennoch zu steuern.The object of the invention is, in the application of the aforementioned highly reactive cast resin compounds, while maintaining the most favorable curing temperature, to control the curing of the resin.
Erfindungsgemäß gelingt dies dadurch, daß dem ausgegossenen Gießharz unmittelbar nach dem Füllen der Form an mindestens einem Punkte kurzzeitig Wärme mit einer wesentlich höheren Temperatur als die der übrigen beheizten Form zugeführt wird, so daß die Härtung von diesem Bereich erhöhter Temperatur aus beginnt. Diese nur an einem Punkte kurzzeitig zugeführte höhere Temperatur ist für das Gießharz nicht schädlich. Dieser Hochtemperaturpunkt bedeutet sozusagen eine ~ Initialzündung " für die Härtung, die an einem von dem Fachmann ausgesuchten Punkte angestoßen wird und von dort aus schnell selbsttätig fortschreitet. Je nach Gestalt und Größe des Gießlings können auch mehrere solcher Hochtemperaturpunkte notwendig sein. Zweckmäßigerweise werden sie in der Formenwandung angeordnet. Um ein schnelles Abfließen der Wärme in die übrige Formenwandung zu vermeiden, empfiehlt es sich, sie thermisch zu isolieren.According to the invention, this is achieved in that the poured Cast resin Immediately after filling the mold, briefly heat at at least one point fed at a much higher temperature than that of the rest of the heated mold so that curing begins from this area of elevated temperature. These A higher temperature briefly applied to only one point is for the cast resin not harmful. This high temperature point means, so to speak, an initial spark "for the hardening that occurs at a point selected by a person skilled in the art and from there it progresses rapidly by itself. Depending on the shape and size Several such high-temperature points may also be necessary on the casting. Appropriately they are arranged in the mold wall. To allow the heat to dissipate quickly To avoid the rest of the mold wall, it is advisable to thermally insulate it.
Als Heizquellen zur Erreichung einer definierten Temperaturerhöhung bieten sich elektrische Heizelemente an, die von einem sich entladenden Kondensator bekannten Energieinhaltes als Energiequelle ( Generator ) gespeist werden.As heat sources to achieve a defined temperature increase electrical heating elements are available, which are powered by a discharging capacitor known energy content can be fed as an energy source (generator).
Auch Peltierelemente können zum Einsatz kommen.Peltier elements can also be used.
Der Erfindungsgegenstand wird an einem gezeichneten Ausführungsbeispiel näher erklärt. Es zeigt einen Schnitt durch eine Formenwandung 1, die von der außen aufgebrachten Heizung 2 auf Härtetemperatur gebracht ist. Ein punktförmig an der inneren Formenwandung angeordnetes Heizelement 3 wird von einem Generator 6 gespeist und ist durch die Wärmeisolation 4 von der übrigen Formenwandung isoliert.The subject of the invention is based on a drawn embodiment explained in more detail. It shows a section through a mold wall 1 from the outside applied heater 2 is brought to hardening temperature. A punctiform at the The heating element 3 arranged on the inner mold wall is fed by a generator 6 and is insulated from the rest of the mold wall by the thermal insulation 4.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732312016 DE2312016A1 (en) | 1973-03-10 | 1973-03-10 | Rapidly curing cast resin mouldings - by additionally heating at a localised spot |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732312016 DE2312016A1 (en) | 1973-03-10 | 1973-03-10 | Rapidly curing cast resin mouldings - by additionally heating at a localised spot |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2312016A1 true DE2312016A1 (en) | 1974-09-12 |
Family
ID=5874423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19732312016 Pending DE2312016A1 (en) | 1973-03-10 | 1973-03-10 | Rapidly curing cast resin mouldings - by additionally heating at a localised spot |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2312016A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3903067A1 (en) * | 1989-02-02 | 1990-08-09 | Gvm Ges Fuer Schraubenverdicht | Rotor for positive displacement machines |
-
1973
- 1973-03-10 DE DE19732312016 patent/DE2312016A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3903067A1 (en) * | 1989-02-02 | 1990-08-09 | Gvm Ges Fuer Schraubenverdicht | Rotor for positive displacement machines |
DE3903067C3 (en) * | 1989-02-02 | 2000-02-10 | Guenter Kirsten | Process for producing a rotor for rotary piston machines, and rotor manufactured using the process |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OF | Willingness to grant licences before publication of examined application | ||
OHJ | Non-payment of the annual fee |