DE1926688A1 - Method for producing a molded part from polyurethane thermoset foam - Google Patents
Method for producing a molded part from polyurethane thermoset foamInfo
- Publication number
- DE1926688A1 DE1926688A1 DE19691926688 DE1926688A DE1926688A1 DE 1926688 A1 DE1926688 A1 DE 1926688A1 DE 19691926688 DE19691926688 DE 19691926688 DE 1926688 A DE1926688 A DE 1926688A DE 1926688 A1 DE1926688 A1 DE 1926688A1
- Authority
- DE
- Germany
- Prior art keywords
- molded part
- mold
- producing
- polyurethane
- foam
- 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
- B29C33/30—Mounting, exchanging or centering
- B29C33/303—Mounting, exchanging or centering centering mould parts or halves, e.g. during mounting
- B29C33/304—Mounting, exchanging or centering centering mould parts or halves, e.g. during mounting centering cores
-
- 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
- B29C33/76—Cores
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- 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
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
- B29C33/50—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible
-
- 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
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- 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
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- 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
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
- B29K2105/043—Skinned foam
Description
Verfahren zum Herstellen eines Formteiles aus Polyurethan-DuromerschaumMethod for producing a molded part Polyurethane duromer foam
Die Erfindung bezieht sich auf ein Verfahren zum Herstellen eines Formteiles mit einer dichten geschlossenen äußeren Schicht aus einem Gemisch von bestimmten Polyisocyanuraten bzw. PoIyisothiocyanuraten mit geeigneten organischen mehrere Hydroxylgruppen aufweisenden Polyestern aus zweibasischen Säuren und Alkoholen oder Polyäthern, die auch als Polyurethan-Duromere bezeichnet werden und Wasser oder einem anderen Treibmittel in Gegenwart von Katalysatoren, insbesondere Zinnkatalysatoren, nach dem Reaktionsspritzgußverfähren. Geeignete Polyurethan-Durdmere sind die unter dem Handelsnamen bekannten, bei Raumtemperatur flüssigen Ausgangsstoffe Deamophen und Desmodur.The invention relates to a method for producing a molded part with a tight, closed outer layer a mixture of certain polyisocyanurates or polyisothiocyanurates with suitable organic polyesters formed from dibasic acids and containing several hydroxyl groups Alcohols or polyethers, which are also known as polyurethane duromers, and water or another blowing agent in Presence of catalysts, especially tin catalysts, after the reaction injection molding process. Suitable polyurethane durumers are those known under the trade name, at room temperature liquid starting materials Deamophen and Desmodur.
Die fortschreitende Verwendung von Polyurethan-Duromeren, beispielsweise im Fahrzeugbau, im Bauwesen und in der Haushaltgeräteindustrie erfordert die Anwendung von besonderen Verfahren, falls bei der Herstellung von Formteilen großer Dimensionen, insbesondere dicker Querschnitte, gute Qualitäten erzielt werden sollen.The increasing use of polyurethane thermosets, For example, in vehicle construction, construction and the household appliance industry requires the use of special processes, if good qualities are achieved in the production of molded parts of large dimensions, in particular thick cross-sections should be.
Die bekannten Arbeitsverfahren mischen die bei Raumtemperatur flüssigen- in einem genauen Mengenverhältnis vorgegebenen Rohstoffe, ein Polyisocyanurat und eine reaktive Hydroxylverbindung, sowie ein Treibmittel. Das niedrig viskose Reaktionsgemisch wird bei einer bestimmten Temperatur unter Druck in den Formenhohlraum eingespritzt (Reaktions-Spritzguß)·. Hier härtet es unter Aufschäumen und Bildung einer dichten geschlossenen harten Oberflächenschicht aus. Durch;entsprechende Temperatur-* führung kann] die Stärke der geschlossenen Oberflächenschicht bis ca. 2 bis 2,5 mm Dicke ansteigen. Die Temperatur der beheizbaren Formen, die aus Aluminium oder Stahl bestehen können, liegt je nach dem eingesetzten Duromer-Typ bei 40 bis 100 0O. Bs können The known working processes mix the raw materials, which are liquid at room temperature and given in a precise quantitative ratio, a polyisocyanurate and a reactive hydroxyl compound, as well as a propellant. The low-viscosity reaction mixture is injected into the mold cavity under pressure at a certain temperature (reaction injection molding). Here it hardens with foaming and the formation of a dense, closed hard surface layer. With appropriate temperature control, the thickness of the closed surface layer can increase to a thickness of approx. 2 to 2.5 mm. The temperature of the heated molds, which can consist of aluminum or steel, depending on the type used thermoset at 40 to 100 0 O. Bs can
109817/1694109817/1694
-2- PLA 69/1192-2- PLA 69/1192
so großflächige Platten mit dünnen Querschnitten hergestellt werden.large-area panels with thin cross-sections can be produced in this way.
Nach dieser Verfahrensweise gelingt es nicht, stabförmige Körper, die im Verhältnis zur Platte eine wesentlich kleinere Oberfläche · und einen großflächigen Querschnitt - Formteile großer Dimenionen und dicker Querschnitte - einwandfrei herzustellen. Es treten bei der Verarbeitung des angegebenen Werkstoffes hohe Reaktionswärmen auf, so daß sich bei Verwendung der bekannten Verfahren im Innern der Formteile Risse und Spalte bilden. f©ra@r entstehen auch Verfärbungen infolge von Werkstoffsohädigtmgen durch überhöhte Temperaturen.After this procedure fails, rod-shaped body, which relative to the plate a much smaller surface · and a large cross-section - properly prepare - great Dimenionen and thicker cross sections moldings. During the processing of the specified material, high reaction heats occur, so that cracks and gaps form in the interior of the molded parts when the known processes are used. f © ra @ r also occur discoloration due to W e rkstoffsohädigtmgen by excessive temperatures.
Die Erfindung zeigt nun einen Weg, wie diese Nachteile bei aus Polyurethan-Duromerschaum bestehenden Formkörpern vermieden werden können. Nach dem erfindungsgemäßen Verfahren wird in die Form ein Körper eingebracht, der allseitig einen Abstand von der Formwand hat, und in den Raum zwischen Körper und Formwand wird die Mischung eingespritzt. Erfindungsgemäß kann ein vorgeschäumter Kern von äußerst niedrigem Raumgewicht eingebracht werden. Als besonders günstig hat sich die Verwendung einer elastischen Hülle, insbesondere eines thermoplastischen Hohlkörpers, dessen Abmessungen kleiner als die entsprechenden Abmessungen des Formkörpers ist, mit schlauchförmiger Öffnung, beispielsweise ein sackartiges oder flaschenförmiges Gebilde erwiesen. Sie ist während des Einspritzens und Schäumungsprozesses mit einer Flüssigkeit oder einem Gas gefüllt.'Die Flüssigkelten können vor Beginn des Schäumprozesses erwärmt oder gekühlt oder auch eingefroren werden. Es kann auch ein unelastischer Körper eingebracht werden. Hierdurch ist es möglich, auf einfachste Weise gerätebedingte Innengehäuse einzubringen» The invention now shows a way in which these disadvantages are avoided in the case of molded bodies made of polyurethane thermoset foam can be. According to the method according to the invention, a body is introduced into the mold, which is spaced apart on all sides from the Has mold wall, and the mixture is injected into the space between the body and mold wall. According to the invention, a pre-expanded Core of extremely low density can be introduced. The use of a elastic shell, in particular a thermoplastic hollow body, the dimensions of which are smaller than the corresponding dimensions of the molded body is, for example, a bag-like or bottle-shaped structure with a tubular opening proven. It is during the injection and foaming process filled with a liquid or a gas. 'The Liquids can be heated, cooled or frozen before the foaming process begins. It can also be a inelastic bodies are introduced. This makes it possible to install device-related inner housings in the simplest possible way »
Durch das erfindungsgemäße Verfahren wird eine zusätzliche I Gewichtsverminddrung erzielt, und es können überdicke Wand- j stärken und damit örtliche überhitzungen vermieden werden. In :■ jedem Falle wird eine geschlossene Außenhaut erreicht. Der erzeugte Körper weist bei hohlem Querschnitt eine nicht thermisch gesohädigte Wandung auf. Der ringförmige Duromer-The inventive method an additional I Gewichtsverminddrung is achieved and it can strengthen j and thus localized overheating is avoided over thick wall. In: ■ a closed outer skin is achieved in every case. With a hollow cross-section, the body produced has a wall that is not thermally damaged. The ring-shaped thermoset
10 9817/169410 9817/1694
-3- PLA 69/1192-3- PLA 69/1192
Schaumkörper mit der geschlossenen dichten Oberflächenschicht hält maximalen Belastungen» insbesondere Druck- und Schlagbeanspruchungen, stand.Foam body with the closed, dense surface layer withstands maximum loads »especially pressure and impact loads, was standing.
Das Verfahren kann in an sich bekannten Formen und Einrichtungen durchgeführt werden.The method can be in forms and means known per se be performed.
Die Formen können aus Metall, beispielsweise Stahl, und auch aus Aluminium bestehen. Me Wärmezufuhr kann über die Form erfolgen. Die Temperaturführung hängt von verschiedenen Faktoren, insbesondere auch von der Größe des Formteiles, ab. Die erforderlichen Drücke sind gering und liegen bei ca. 1-3 kp/cm . Nach Beendigung des Ausschäumens, Entfernen aus der Form und Abkühlen wird bei Verwendung von Hohlkörpern die Flüssigkeit wieder aus diesen entfernt.The forms can be made of metal, for example steel, and also of aluminum. Heat can be supplied via the mold. The temperature control depends on various factors, in particular also on the size of the molded part. The pressures required are low and are around 1-3 kp / cm. After completion foaming, removing from the mold and cooling If hollow bodies are used, the liquid is removed from them again.
Nach dem erfindungsgemäßen Verfahren ist es erstmals möglich, Polyurethan-Duromere auf technisch einfache Weise zu rissefreien maßhaltigen Formteilen großer Dimensionen, insbesondere dicken Querschnitts, die eine geschlossene äußere Oberflächenschicht aufweisen, zu verarbeiten. Als Beispiel für solche Formteile sind Lüfterflügel, Gehäuse zur Wärmeisolation, z.B. Warmwasserspeicher, zu nennen.The process according to the invention makes it possible for the first time to free from cracks in polyurethane thermosets in a technically simple manner dimensionally stable molded parts of large dimensions, in particular thick cross-section, which have a closed outer surface layer have to process. As an example of such molded parts include fan blades, housings for thermal insulation, e.g. hot water storage tanks.
In den Figuren 1, 2, 3 und 4· ist ein Formteil hergestellt nach dem erfindungsgemäßen Verfahren schematisch dargestellt. Mit 1 ist der eingebrachte Körper, ein elastischer Hohlkörper, der mit Flüssigkeit oder Gas gefüllt ist, oder ein Schaumstoffkörper bezeichnet. 2 bezeichnet jeweils den Polyurethan-Duromerschaum und 3 die dichte geschlossene Oberflächenschicht.In Figures 1, 2, 3 and 4 · a molded part is produced according to the method according to the invention shown schematically. With 1 is the introduced body, an elastic hollow body, with Liquid or gas is filled, or a foam body designated. 2 each denotes the polyurethane duromer foam and 3 the dense, closed surface layer.
Die Erfindung wird anhand der Ausführungsbeispiele näher erläutert, The invention is explained in more detail using the exemplary embodiments,
Für einen Warmwasserspeicher wurde eine Polypropylenhülle mit ca. 60 ° warmem Wasser gefüllt und in einem Werkzeug freihängend derart befestigt, daß der gewünschte Abstand von der Formwandung gegeben war. (vgl. Fig.3 und 4·)A polypropylene cover was used for a hot water tank about 60 ° warm water and fixed hanging freely in a tool in such a way that the desired distance from the Form wall was given. (see Fig. 3 and 4)
1 0 9 8 1 7 / 1 6 9 A -4-1 0 9 8 1 7/1 6 9 A -4-
-4- PLA 69/1192-4- PLA 69/1192
ITaeh Schließen des Werkzeuges wurde dieses mit dem Polyürethan-Duromergemisch gefüllt und der zwischen der gefüllten Polypropylenfolie und dem Werkzeug bestehende Hohlraum ausgeschäumt, !fach Entformung wurde der flüssige Inhalt des Polyäthylenbehälters entleert. Hierdurch entstand ein rißfreier Hohlkörper mit guten Wärmeisolationseigenschaften.After closing the tool, this was done with the polyurethane-duromer mixture filled and the cavity between the filled polypropylene film and the tool filled with foam, The liquid content of the polyethylene container has been emptied once the mold has been removed from the mold. This also resulted in a crack-free hollow body good thermal insulation properties.
Beispiel 2 · " Example 2 "
An Stelle der Polypropylenhülle wurde ein gleichfalls mit Wasser gefüllter Kupferbehälter verwendet und wie in Beispiel 1 verschäumt . Instead of the polypropylene casing, one was also used with water Filled copper container used and foamed as in Example 1.
5 Patentansprüche
4- Figuren '5 claims
4- figures'
-5--5-
109817/1109817/1
Claims (5)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691926688 DE1926688A1 (en) | 1969-05-24 | 1969-05-24 | Method for producing a molded part from polyurethane thermoset foam |
NL7005482A NL7005482A (en) | 1969-05-24 | 1970-04-16 | |
CH717170A CH515112A (en) | 1969-05-24 | 1970-05-14 | Method for producing a molded part from polyurethane thermoset foam |
GB2378070A GB1311807A (en) | 1969-05-24 | 1970-05-15 | Process for the production of a moulded part of a hard foam |
ES379919A ES379919A1 (en) | 1969-05-24 | 1970-05-22 | Process for the production of a moulded part of a hard foam |
FR7018800A FR2043653A1 (en) | 1969-05-24 | 1970-05-22 | |
BE750794D BE750794A (en) | 1969-05-24 | 1970-05-22 | MANUFACTURING PROCESS OF A MOLDED PART FROM DUROMERIC DEPOLYURETHANE FOAM |
LU60969D LU60969A1 (en) | 1969-05-24 | 1970-05-22 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691926688 DE1926688A1 (en) | 1969-05-24 | 1969-05-24 | Method for producing a molded part from polyurethane thermoset foam |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1926688A1 true DE1926688A1 (en) | 1971-04-22 |
Family
ID=5735164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19691926688 Pending DE1926688A1 (en) | 1969-05-24 | 1969-05-24 | Method for producing a molded part from polyurethane thermoset foam |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE750794A (en) |
CH (1) | CH515112A (en) |
DE (1) | DE1926688A1 (en) |
ES (1) | ES379919A1 (en) |
FR (1) | FR2043653A1 (en) |
GB (1) | GB1311807A (en) |
LU (1) | LU60969A1 (en) |
NL (1) | NL7005482A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3439101A1 (en) * | 1984-10-25 | 1986-05-07 | Irbit Research + Consulting Ag, Freiburg/Fribourg | Composite body production process |
DE3525866A1 (en) * | 1985-07-19 | 1987-01-29 | Jakob Herrmann | DEVICE FOR TESTING AND / OR MACHINING SMALL COMPONENTS |
DE4340701A1 (en) * | 1993-11-30 | 1995-06-01 | Fehrer Gummihaar | Making a form contg. a closed cavity or connected channel |
DE19747645A1 (en) * | 1997-10-29 | 1999-05-06 | Behr Gmbh & Co | Process for producing a foam body and foam body |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2160245A1 (en) * | 1971-11-15 | 1973-06-29 | Maglum Sa | Composite hollow mouldings - with optimised combination of flexibility and strength esp for automobile furnishings |
GB2131737A (en) * | 1982-10-21 | 1984-06-27 | Macchi International Spa | Shaped bodies and method for their production |
-
1969
- 1969-05-24 DE DE19691926688 patent/DE1926688A1/en active Pending
-
1970
- 1970-04-16 NL NL7005482A patent/NL7005482A/xx unknown
- 1970-05-14 CH CH717170A patent/CH515112A/en not_active IP Right Cessation
- 1970-05-15 GB GB2378070A patent/GB1311807A/en not_active Expired
- 1970-05-22 ES ES379919A patent/ES379919A1/en not_active Expired
- 1970-05-22 BE BE750794D patent/BE750794A/en unknown
- 1970-05-22 FR FR7018800A patent/FR2043653A1/fr not_active Withdrawn
- 1970-05-22 LU LU60969D patent/LU60969A1/xx unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3439101A1 (en) * | 1984-10-25 | 1986-05-07 | Irbit Research + Consulting Ag, Freiburg/Fribourg | Composite body production process |
DE3525866A1 (en) * | 1985-07-19 | 1987-01-29 | Jakob Herrmann | DEVICE FOR TESTING AND / OR MACHINING SMALL COMPONENTS |
DE4340701A1 (en) * | 1993-11-30 | 1995-06-01 | Fehrer Gummihaar | Making a form contg. a closed cavity or connected channel |
DE19747645A1 (en) * | 1997-10-29 | 1999-05-06 | Behr Gmbh & Co | Process for producing a foam body and foam body |
Also Published As
Publication number | Publication date |
---|---|
GB1311807A (en) | 1973-03-28 |
FR2043653A1 (en) | 1971-02-19 |
CH515112A (en) | 1971-11-15 |
LU60969A1 (en) | 1970-07-23 |
NL7005482A (en) | 1970-11-26 |
BE750794A (en) | 1970-11-23 |
ES379919A1 (en) | 1972-09-01 |
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