DE2544560A1 - Integral foam moulding prepn. - by mixing two reactive components with blowing agent having specific boiling point - Google Patents
Integral foam moulding prepn. - by mixing two reactive components with blowing agent having specific boiling pointInfo
- Publication number
- DE2544560A1 DE2544560A1 DE19752544560 DE2544560A DE2544560A1 DE 2544560 A1 DE2544560 A1 DE 2544560A1 DE 19752544560 DE19752544560 DE 19752544560 DE 2544560 A DE2544560 A DE 2544560A DE 2544560 A1 DE2544560 A1 DE 2544560A1
- Authority
- DE
- Germany
- Prior art keywords
- mixing
- boiling point
- reactive components
- blowing agent
- prepn
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
Verfahren zum Herstellen von geformten Schaumstoffartikeln Process for making molded foam articles
Die vorliegende Erfindung richtet sich auf ein Verfahren zum Herstellen von geformten Schaumstoffartikeln, wobei mindestens zwei reaktive Komponenten und ein Treibmittel miteinander vermischt werden und das Reaktionsgemisch anschließend in den Formhohlraum eingegeben wird.The present invention is directed to a method of manufacturing of molded foam articles, wherein at least two reactive components and a propellant are mixed together and then the reaction mixture is entered into the mold cavity.
Bei der Herstellung von Schaumstoffen, insbesondere harten Schaumstoffen, die vornehmlich auf Basis Polyurethan hergestellt werden, hat sich die Vorschäummethode bewährt, in der Fachwelt unter dem Begriff "Frothing" bekannt. Darunter versteht man die Vorbereitung des Reaktionsgemisches derart, daß es bereits als sahniger Schaum in den Formhohlraum des Formwerkzeuges eintritt. Der Vorteil liegt in der ruhigen geschlossenen Fließfront, die eine hohe Oberflächengüte gewährleistet.In the production of foams, especially hard foams, which are primarily manufactured on the basis of polyurethane, the pre-expansion method has proven itself proven, known in the professional world under the term "Frothing". Understood by that one preparing the reaction mixture so that it is already creamier Foam enters the mold cavity of the mold. The advantage lies in the calm, closed flow front, which guarantees a high surface quality.
Die im Fertigteil häufig auftretenden, störenden Treibmitteleinschlüsse, die ein nachträgliches Ausbeulen zur Folge haben, werden vermieden.The disruptive blowing agent inclusions that often occur in the finished part, which result in subsequent bulging are avoided.
Der Frothing-Effekt wird beispielsweise durch Zugabe eines niedrigsiedenden Treibmittels, wie Difluordichlormethan oder eines Monofluortrichlormethan-Difluordichlormethangemisches erreicht.The frothing effect is achieved, for example, by adding a low-boiling point Propellants such as difluorodichloromethane or a monofluorotrichloromethane-difluorodichloromethane mixture achieved.
Die Verarbeitung dieses Treibmittels bzw. Gemisches ist problematisch, da ihre Siedepunkte unter 0° C liegen und die Anlieferung in Druckbomben erfolgen muß. Die Dosierung solcher Treibmittel über jede Art von Pumpen beinhaltet Probleme, da die stöchiometrischen Mengenanteile genau eingehalten werden müssen, was selbst durch den Einsatz von Hochleistungskolbenpumpen aufgrund der Leckverluste kaum möglich ist.The processing of this propellant or mixture is problematic, because their boiling points are below 0 ° C and they are delivered in pressure bombs got to. The dosing of such propellants via any type of pump involves problems since the stoichiometric proportions must be strictly adhered to, What even through the use of high-performance piston pumps due to leakage losses is hardly possible.
Durch Zugabe von hohen Gasanteilen kann der Frothing-Effekt ebenfalls erzielt werden. Beispielsweise gibt man in die Polyolkomponente 0,4 - 0,8 g eines entspannten Gases, z.B. Luft oder Stickstoff auf 1 1 Polyol. Hier ist die Problematik ähnlich. Die Dosierung des Gases erfolgt über Strömungsmesser und ist dementsprechend ungenau. Das Gas muß in der Komponente feinstverteilt vorliegen, da nur bei intensiver Vermischung die geforderten Effekte erzielt werden. Weiterhin muß das Gemisch aus Gas und Komponente bei der Dosierung über die gebräuchlichen Hochdruckpumpen unter so hohem Druck gehalten werden, daß durch die eingemischten Gasblasen keine Fehldosierungen hervorgerufen werden.The frothing effect can also be achieved by adding high proportions of gas be achieved. For example, 0.4-0.8 g of one is added to the polyol component expanded gas, e.g. air or nitrogen to 1 liter of polyol. Here's the problem similar. The gas is metered using a flow meter and is accordingly inaccurate. The gas must be very finely distributed in the component, since only with more intensive Mixing the required effects can be achieved. Furthermore, the mixture must be made of Gas and components are metered using the common high pressure pumps must be kept at such a high pressure that the mixed-in gas bubbles do not result in incorrect metering be evoked.
Es konnte beobachtet werden, daß durch Verminderung des Anteils von Nonofluortrichlormethan, das bereits bei 23,50 C siedet, und durch Ersatz desselben durch Difluordichlormethan oder Gas eine erhebliche Qualitätsverminderung der Außenhaut in Härte und Stärke in Kauf genommen werden muß.It could be observed that by reducing the proportion of Nonofluorotrichloromethane, which already boils at 23.50 C, and by replacing the same due to difluorodichloromethane or gas a considerable reduction in the quality of the outer skin must be accepted in hardness and strength.
Beispielsweise konnten bisher durch Rezepturen aus Polyol, Isocyanat und etwa 8 bis 10 Gewichtsanteilen Monofluortrichlormethan Schaumstoffe guter Qualität hergestellt werden; jedoch treten erhebliche Verbesserungen hinsichtlich Vermeidung von Blasen ein, wenn man den Vorschäumeffekt ausnutzt, der durch Zugabe von Difluordichlormethan oder Gas entsteht, allerdings auf Kosten der Eigenschaften der Außenhaut.For example, recipes made from polyol, isocyanate and about 8 to 10 parts by weight of good quality monofluorotrichloromethane foams getting produced; however, there are significant improvements in terms of avoidance of bubbles if you take advantage of the pre-foaming effect, which is achieved by adding difluorodichloromethane or gas is produced, but at the expense of the properties of the outer skin.
Aufgabe der Erfindung ist es deshalb, ein Verfahren anzugeben, mit dem der Vorschäumeffekt mit seinen bekannten Vorteilen durchführbar ist, aber gleichzeitig auch eine hohe Qualität der Außenhaut bei Integralschaumstoffen erzielt wird.The object of the invention is therefore to provide a method with which the pre-foam effect with its known advantages can be carried out, but at the same time a high quality of the outer skin is also achieved with integral skin foams.
Die erfindungsgemäße Lösung ist darin zu sehen, daß als Treibmittel ein solches verwendet wird, dessen Siedetemperatur bei einem Druck von 760 mm Quecksilbersäule zwischen 150 C und 600 C liegt und daß die Rohstoffgemischtemperatur mindestens 5° C oberhalb der Siedetemperatur des Treibmittels gehalten wird.The solution according to the invention can be seen in the fact that as a propellant one is used whose boiling point is at a pressure of 760 mm of mercury between 150 C and 600 C and that the raw material mixture temperature is at least 5 ° C is kept above the boiling point of the propellant.
Dadurch werden die gewünschten Effekte erreicht. Beispielsweise wird bei der Zugabe von Monofluortrichlormethan bei einer Gemischtemperatur von 500 C der gleiche Vorschäumeffekt erzielt wie bei der Zugabe des niedrigsiedenden Difluordichlormethan 0 bei einer Gemischtemperatur von 20 C.This achieves the desired effects. For example, will when adding monofluorotrichloromethane at a mixture temperature of 500 ° C the same pre-expansion effect is achieved as with the addition of the low-boiling difluorodichloromethane 0 at a mixed temperature of 20 C.
Treibmittel, die im Rahmen des erfindungsgemäßen Verfahrens beispielsweise verwendbar sind, sind neben Monofluortrichlormethan 1.1.2 .2-Tetrafluor-1 .2-dichloräthan, 1.1 .2-Trifluor-1 .2.2-trichloräthan, Methylenchlorid, Aceton, Chloroform, Diäthyläther und Cyclopentan.Propellants, for example, in the context of the process according to the invention are usable, in addition to monofluorotrichloromethane 1.1.2 .2-tetrafluoro-1 .2-dichloroethane, 1.1 .2-trifluoro-1 .2.2-trichloroethane, methylene chloride, acetone, chloroform, diethyl ether and cyclopentane.
Die Erwärmung auf die gewünschte Gemischtemperatur kann durch Erwärmung des Gemisches erfolgen. Dies läßt sich nur schwierig verwirklichen. Vorteilhafter ist es, eine oder beide Komponenten vorzuwärmen. Die Zugabe des Treibmittels erfolgt beispielsweise in einer der Komponenten in einer Vormischkammer oder durch Injektion kurz vor der Mischkammer. Die Zugabe des Treibmittels in eine vorgewärmte Komponente muß natürlich unter Druck geschehen, damit gewährleistet ist, daß das Treibmittel erst nach Eintritt in die eigentliche Mischkammer siedet bzw. den Vorschäumeffekt erzielt.The heating to the desired mixture temperature can be achieved by heating of the mixture. This is difficult to achieve. More advantageous is to preheat one or both components. The propellant is added for example in one of the components in a premixing chamber or by injection just before the mixing chamber. The addition of the propellant to a preheated component must of course be done under pressure to ensure that the propellant only after entering the actual mixing chamber does it boil or the pre-foaming effect achieved.
Als Vorrichtungen zur Durchführung des Verfahrens eignen sich insbesondere solche mit Kreislaufführung der Komponenten während der Pausen- und Stillstandszeiten. Zur Temperierung müssen beheizbare Zwischenbehälter oder beheizbare Leitungen vorgesehen sein. Es versteht sich, daß bei solchen Vorrichtungen die Zugabe des Treibmittels während der Pausen- und Stillstandszeiten unterbrochen werden muß.Particularly suitable devices for carrying out the method are those with component recycling during breaks and downtimes. Heatable intermediate containers or heatable lines must be provided for temperature control be. It is understood that in such devices, the addition of the propellant must be interrupted during breaks and downtimes.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752544560 DE2544560A1 (en) | 1975-10-04 | 1975-10-04 | Integral foam moulding prepn. - by mixing two reactive components with blowing agent having specific boiling point |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752544560 DE2544560A1 (en) | 1975-10-04 | 1975-10-04 | Integral foam moulding prepn. - by mixing two reactive components with blowing agent having specific boiling point |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2544560A1 true DE2544560A1 (en) | 1977-04-07 |
Family
ID=5958372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19752544560 Pending DE2544560A1 (en) | 1975-10-04 | 1975-10-04 | Integral foam moulding prepn. - by mixing two reactive components with blowing agent having specific boiling point |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2544560A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03152160A (en) * | 1989-10-06 | 1991-06-28 | Basf Ag | Production of polyurethane hard foaming plastic having slight heat conductivity |
US5428077A (en) * | 1993-02-10 | 1995-06-27 | Bayer Aktiengesellschaft | Process for producing isocyanate-based foams |
JPH0762090B2 (en) * | 1989-04-24 | 1995-07-05 | ビルヘルム フュッツェン,ハンス | Urethane foam material containing no halogenated hydrocarbon and method for producing the same |
US5578653A (en) * | 1994-11-10 | 1996-11-26 | Basf Schwarzheide | Preparation of cellular polyurethanes |
US6235799B1 (en) | 1997-05-21 | 2001-05-22 | Bayer Aktiengesellschaft | Method for producing soft to medium-hard structural polyurethane foams |
EP1544229A2 (en) | 2003-12-17 | 2005-06-22 | Bayer MaterialScience AG | Process for the preparation of polyurethane integral foams |
EP2476714A1 (en) | 2011-01-13 | 2012-07-18 | Basf Se | Polyurethane integral foams with improved surface hardness |
-
1975
- 1975-10-04 DE DE19752544560 patent/DE2544560A1/en active Pending
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0762090B2 (en) * | 1989-04-24 | 1995-07-05 | ビルヘルム フュッツェン,ハンス | Urethane foam material containing no halogenated hydrocarbon and method for producing the same |
JPH03152160A (en) * | 1989-10-06 | 1991-06-28 | Basf Ag | Production of polyurethane hard foaming plastic having slight heat conductivity |
EP0421269A3 (en) * | 1989-10-06 | 1991-09-04 | Basf Aktiengesellschaft | Process for the preparation of rigid polyurethane foams with low heat-conductivity and their use |
US5096933A (en) * | 1989-10-06 | 1992-03-17 | Otto Volkert | Process for the preparation of polyurethane rigid foams having a low thermal conductivity and their use |
JP3216646B2 (en) | 1989-10-06 | 2001-10-09 | ビーエーエスエフ アクチェンゲゼルシャフト | Manufacturing method of polyurethane foam with low thermal conductivity |
US5428077A (en) * | 1993-02-10 | 1995-06-27 | Bayer Aktiengesellschaft | Process for producing isocyanate-based foams |
US5578653A (en) * | 1994-11-10 | 1996-11-26 | Basf Schwarzheide | Preparation of cellular polyurethanes |
US6235799B1 (en) | 1997-05-21 | 2001-05-22 | Bayer Aktiengesellschaft | Method for producing soft to medium-hard structural polyurethane foams |
EP1544229A2 (en) | 2003-12-17 | 2005-06-22 | Bayer MaterialScience AG | Process for the preparation of polyurethane integral foams |
EP2476714A1 (en) | 2011-01-13 | 2012-07-18 | Basf Se | Polyurethane integral foams with improved surface hardness |
DE102012200272A1 (en) | 2011-01-13 | 2012-07-19 | Basf Se | Polyurethane integral foams with improved surface hardness |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE1200515B (en) | Process for the production of foam plastic molded articles | |
DE2461580B2 (en) | Process for the production of injection-molded parts made of thermoplastic material with a smooth surface and a porous core | |
DE2911719C2 (en) | Process for the production of lightweight foams from thermoplastic crystalline plastics | |
EP0719627A2 (en) | Process and device for producing foam using carbon dioxide dissolved under pressure | |
DE2110583A1 (en) | For the production of rigid polyurethane foam with a self-forming outer skin according to the one-step process and the one-step process | |
DE2544560A1 (en) | Integral foam moulding prepn. - by mixing two reactive components with blowing agent having specific boiling point | |
EP0753389B1 (en) | Method of making polyurethane foam articles | |
DE1504674B1 (en) | Process for the continuous production of objects from hard foam on the basis of polyvinyl chloride containing polyisocyanates by extrusion | |
DE4220998C1 (en) | Process for making integral foam | |
DE1081657B (en) | Device for the production of porous or homogeneous plastics | |
DE2335310B2 (en) | PROCESS FOR MANUFACTURING STRUCTURAL FOAM WITH UNFOAMED OUTER SKIN AND SMOOTH AND GLOSSY SURFACE FROM THERMOPLASTIC PLASTICS | |
DE1127068B (en) | Process for the production of non-cylindrical molded foam bodies provided with cover layers made of solid thermoplastics | |
DE953561C (en) | Process for the production of foam bodies based on polyester isocyanate | |
DE2132996B2 (en) | SHAPED PRODUCT MADE FROM CRUSHED FOAM MATERIAL IN A POLYURETHANE MATRIX AND PROCESS FOR ITS MANUFACTURING | |
DE2206372A1 (en) | Process for the production of molded upholstery parts | |
DE2029284C3 (en) | Process for the production of polyether urethane foams | |
DE1922069A1 (en) | Composite molded article and process for making the same | |
DE2202133C3 (en) | Process for the production of plastic molded parts with a dense outer skin and a foamed core made of polyurethane | |
DE3049834C2 (en) | Process for the production of one-component polyurethane foam | |
GB2035194A (en) | Moulding foamed urethane plastics articles in a double coated mould | |
DE2462659C3 (en) | METHOD FOR INJECTION MOLDING PLASTIC BODIES | |
EP1097034A1 (en) | Method and device for foaming plastics | |
DE2102247A1 (en) | Process for the production of polyamide foams | |
AT204785B (en) | Process for the production of rigid, porous, thermoplastic materials | |
DE1704548A1 (en) | Process for the production of polyurethane cell bodies |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OHN | Withdrawal |