DE3734070A1 - Syntactic damping foam - Google Patents
Syntactic damping foamInfo
- Publication number
- DE3734070A1 DE3734070A1 DE19873734070 DE3734070A DE3734070A1 DE 3734070 A1 DE3734070 A1 DE 3734070A1 DE 19873734070 DE19873734070 DE 19873734070 DE 3734070 A DE3734070 A DE 3734070A DE 3734070 A1 DE3734070 A1 DE 3734070A1
- Authority
- DE
- Germany
- Prior art keywords
- weight
- parts
- damping foam
- syntactic
- 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.)
- Granted
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
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/69—Polymers of conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2101/00—Manufacture of cellular products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2350/00—Acoustic or vibration damping material
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Vibration Prevention Devices (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen syntaktischen Dämpfungs schaum, der für empfindliche Schwingsysteme geeignet ist.The invention relates to a syntactic damping foam that is suitable for sensitive vibration systems.
Stand der Technik ist, daß nach DIN 7726 künstlich hergestellte Schaumstoffe Werkstoffe zelliger Struktur darstellen. Um be stimmte mechanische oder akustische Dämpfungscharakteristika zu erreichen, werden hauptsächlich sogenannte Weichschäume eingesetzt. Da die Dämpfungseigenschaften des Schaumes bei Aufnahme von Wasser sehr stark unerwünscht beeinflußt werden, müssen die Schäume geschlossenzellig sein. Um das Wasser am Eindringen in Spalte zu verhindern, wird auch eine hohe Haf tung gefordert.State of the art is that according to DIN 7726 artificially produced Foams represent materials with a cellular structure. To be agreed mechanical or acoustic damping characteristics so-called soft foams are mainly to be achieved used. Since the damping properties of the foam Absorption of water can be influenced very undesirably, the foams must be closed-celled. To the water on Preventing gaps from entering will also be a high haf required.
Je nach Herstellungsart spricht man von mechanisch geschlagenen oder chemisch getriebenen Schäumen. Für Dämpfungsaufgaben werden hauptsächlich getriebene Polyurethanschäume eingesetzt, bei de nen die Erzeugung der Zellstruktur durch fein verteilte Bildung von Gasblasen erreicht wird. Die Grenzen der Anwendung solcher Art von Schäumen liegen im absoluten Gießvolumen, da mit zu nehmender Verminderung der Volumina durch relativ eklatante Einflüsse von Temperaturen, Oberflächen, Feuchtigkeiten usw. ein gleichmäßiges Dämpfungsverhalten nicht mehr hergestellt werden kann. Eine andere Grenze ist die starke Abhängigkeit der Dämpfung von der Einsatztemperatur, die üblicherweise im technischen Bereich meist zwischen -25°C +80°C liegt.Depending on the type of manufacture, one speaks of mechanically struck or chemically driven foams. For damping tasks mainly polyurethane foams used, de NEN the generation of the cell structure through finely divided formation is reached by gas bubbles. The limits of using such Kind of foams are in the absolute casting volume, because with decreasing volumes due to relatively blatant Influences of temperatures, surfaces, moisture, etc. a uniform damping behavior is no longer produced can be. Another limit is the strong dependency the damping of the operating temperature, which is usually in technical range is usually between -25 ° C + 80 ° C.
Bei besonders empfindlichen Schwingungssystemen, wie z.B. Ul traschall-Sensoren befriedigen solche Dämpfungsschäume selten. Im Prinzip würden Silikonschäume die Aufgabe erfüllen, diese haben aber ein extrem hohes thermisches Ausdehnungsverhalten und eine starke Quellung bei Einwirkung gebräuchlicher Lösungs mittel.For particularly sensitive vibration systems, such as Ul ultrasonic sensors rarely satisfy such damping foams. In principle, silicone foams would do the job but have an extremely high thermal expansion behavior and strong swelling when exposed to common solutions medium.
Der Erfindung liegt somit die Aufgabe zugrunde, einen Dämpfungs schaum zu schaffen, der für empfindliche Schwingungssysteme ge eignet ist.The invention is therefore based on the object of a damping to create foam suitable for sensitive vibration systems is suitable.
Dies wird auf einfache Weise dadurch erreicht, daß die Matrix des Schaums aus einer Mischung von Hydroxylgruppen tragenden niedermolekularem flüssigen Polybutadien und einer Vernetzungs komponente, wie Polyisocyanat oder polymere Säureanhydride, wie Maleinsäureanhydridaddukte von niedermolekularem Polybutadien, besteht.This is easily achieved in that the matrix of the foam from a mixture of hydroxyl groups low molecular weight liquid polybutadiene and a crosslinking component, such as polyisocyanate or polymeric acid anhydrides, such as Maleic anhydride adducts of low molecular weight polybutadiene, consists.
Als besonders vorteilhaft hat sich ein System aus folgenden Komponenten herausgestellt: Ein hydroxylgruppentragendes nie dermolekulares flüssiges Polybutadien wird mit einem Malein säureanhydridaddukt eines niedermolekularen Polybutadiens im Massenverhältnis 1,5 : 1 bis 1 : 1,5 kombiniert. Besonders vor teilhaft sind solche Kombinationen, die nicht mehr als 20% vom stöchiometrischen Verhältnis abweichen. Die Vernetzung verläuft als additive Veresterung zwischen Raumtemperatur in nerhalb mehrerer Tage und 100°C in wenigen Minuten. Die Her stellungsverfahren der Einzelkomponenten sind beispielsweise aus folgenden Druckschriften bekannt:A system of the following has proven to be particularly advantageous Components exposed: never a hydroxyl group dermolecular liquid polybutadiene comes in one go acid anhydride adduct of a low molecular weight polybutadiene combined in a mass ratio of 1.5: 1 to 1: 1.5. Especially before combinations that do not exceed 20% deviate from the stoichiometric ratio. The networking runs as an additive esterification between room temperature in within several days and 100 ° C in a few minutes. The Her Positioning methods of the individual components are, for example known from the following publications:
E-PS 01 49 736, DE-PS 12 19 684, DE-PS 20 13 096, DE-PS 23 25 826, E-PS 00 82 973, E-PS 00 99 976.E-PS 01 49 736, DE-PS 12 19 684, DE-PS 20 13 096, DE-PS 23 25 826, E-PS 00 82 973, E-PS 00 99 976.
Besonders vorteilhaft ist es hierbei, wenn der noch unvernetz ten Matrix Mikrohohlkugeln, vorzugsweise aus Polyvinylidenfluo rid, als kompressible Komponente im Mischungsverhältnis von 1-5 Gewichtsteilen auf 100 Gewichtsteile Harze beigemischt sind. Da es sich weder um einen getriebenen noch um einen geschlagenen Schaum handelt, sondern um eine gießfähige Mischung von gleichmäßig verteilten elastischen Mikrohohlkugeln in ela stischer Matrix, bezeichnet man dieses System als einen syntak tischen Weichschaum. Ein Mischungsverhältnis von 3 Gewichtstei len auf 100 Gewichtsteile Harze hat sich hier als besonders vorteilhaft erwiesen. Um einer Sedimentation entgegenzuwirken, ist fibrilliertes Polyäthylen im Mischungsverhältnis von 1-5 Gewichtsteilen auf 100 Gewichtsteile Harze zugegeben. Auch hier hat sich ein Mischungsverhältnis von 3 Gewichtsteilen eines thixotropierenden Mittels auf 100 Gewichtsteile Harze als vor teilhaft erwiesen, was auch eine Erhöhung der inneren Festig keit bewirkt. Zur Anpassung der Eigenschaften können weitere Füllstoffe oder Verstärkungsstoffe beigegeben werden. Die Ver netzung verläuft als additive Veresterung zwischen Raumtem peratur innerhalb mehrerer Tage und 100°C in wenigen Minuten.It is particularly advantageous here if the is not yet networked th matrix hollow microspheres, preferably made of polyvinylidene fluo rid, as a compressible component in the mixing ratio of 1-5 parts by weight per 100 parts by weight of resins are. Since it is neither driven nor one whipped foam is a pourable mixture of evenly distributed elastic micro hollow spheres in ela tic matrix, this system is called a syntak tables soft foam. A mixing ratio of 3 parts by weight len on 100 parts by weight of resin has been found to be special here proven advantageous. To counteract sedimentation, is fibrillated polyethylene in a mixing ratio of 1-5 Parts by weight per 100 parts by weight of resins added. Here too has a mixing ratio of 3 parts by weight of one thixotropic agent on 100 parts by weight of resins as before Partially proven, which also increases the internal strength effect. To adjust the properties, other Fillers or reinforcing materials are added. The Ver Networking runs as an additive esterification between room elements temperature within several days and 100 ° C in a few minutes.
Wenn alle bekannten Herstell-Erfordernisse erfüllt werden, ent steht ein syntaktischer Schaum mit sehr gleichmäßig verteilter Porosität, sehr gleichmäßiger Kompressibiliät und Dämpfung über einen weiten Temperaturbereich. Die sehr geringe Wasseraufnahme, die ausreichende Lösungsmittelbeständigkeit und die gute Haftung an unterschiedlichen Werkstoffen prädestinieren diesen Dämpfungs schaum besonders für hochwertige technische Aufgaben, z.B. zur Einbettung von Ultraschall-Sensoren in Gehäusen oder ähnlichem.If all known manufacturing requirements are met, ent is a syntactic foam with very evenly distributed Porosity, very uniform compressibility and damping over a wide temperature range. The very low water absorption, sufficient solvent resistance and good adhesion on different materials predestine this damping foam especially for high-quality technical tasks, e.g. to Embedding ultrasonic sensors in housings or the like.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873734070 DE3734070A1 (en) | 1987-10-08 | 1987-10-08 | Syntactic damping foam |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873734070 DE3734070A1 (en) | 1987-10-08 | 1987-10-08 | Syntactic damping foam |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3734070A1 true DE3734070A1 (en) | 1989-04-20 |
DE3734070C2 DE3734070C2 (en) | 1990-11-08 |
Family
ID=6337908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19873734070 Granted DE3734070A1 (en) | 1987-10-08 | 1987-10-08 | Syntactic damping foam |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3734070A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0940801A2 (en) * | 1998-03-04 | 1999-09-08 | Siemens Aktiengesellschaft | Ultrasonic transducer with moulded centering element |
FR2814210A1 (en) * | 2000-09-21 | 2002-03-22 | Atofina | USE OF ANTI-VIBRATORY POLYURETHANN FOAMS BASED ON HYDROXYTELECHELIC POLYBUTADIENE IN MECHANICAL AND / OR ACOUSTIC INSULATION AT LOW TEMPERATURE |
FR2817872A1 (en) * | 2000-12-22 | 2002-06-14 | Atofina | Polyurethane foam useful in high-frequency acoustic and/or mechanical insulation, derived from a hydroxy-telechelic polydiene |
EP2104928B1 (en) * | 2006-12-22 | 2016-03-30 | Giesecke & Devrient GmbH | Device for outputting and/or receiving ultrasound and ultrasound sensor for inspecting a valuable document |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3462516A (en) * | 1964-08-31 | 1969-08-19 | Phillips Petroleum Co | Blends of a liquid diene polymer and maleic anhydride copolymer |
DE2013096C3 (en) * | 1970-03-19 | 1975-02-20 | Chemische Werke Huels Ag, 4370 Marl | Process for the production of adducts from maleic anhydride and liquid low molecular weight butadiene polymers |
-
1987
- 1987-10-08 DE DE19873734070 patent/DE3734070A1/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3462516A (en) * | 1964-08-31 | 1969-08-19 | Phillips Petroleum Co | Blends of a liquid diene polymer and maleic anhydride copolymer |
DE2013096C3 (en) * | 1970-03-19 | 1975-02-20 | Chemische Werke Huels Ag, 4370 Marl | Process for the production of adducts from maleic anhydride and liquid low molecular weight butadiene polymers |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0940801A2 (en) * | 1998-03-04 | 1999-09-08 | Siemens Aktiengesellschaft | Ultrasonic transducer with moulded centering element |
EP0940801A3 (en) * | 1998-03-04 | 2001-06-20 | Siemens Aktiengesellschaft | Ultrasonic transducer with moulded centering element |
FR2814210A1 (en) * | 2000-09-21 | 2002-03-22 | Atofina | USE OF ANTI-VIBRATORY POLYURETHANN FOAMS BASED ON HYDROXYTELECHELIC POLYBUTADIENE IN MECHANICAL AND / OR ACOUSTIC INSULATION AT LOW TEMPERATURE |
EP1191048A1 (en) * | 2000-09-21 | 2002-03-27 | Atofina | Use of VIBRATION-DAMPING polyurethane foams based on hydroxytelechelic polybutadiene for mechanical and/or acoustic isolation at low temperature |
FR2817872A1 (en) * | 2000-12-22 | 2002-06-14 | Atofina | Polyurethane foam useful in high-frequency acoustic and/or mechanical insulation, derived from a hydroxy-telechelic polydiene |
EP1233033A1 (en) * | 2000-12-22 | 2002-08-21 | Atofina | Use of vibration-damping polyurethane foams based on hydroxytelechelic polybutadiene for mechanical and/or acoustic isolation at high frequency |
EP2104928B1 (en) * | 2006-12-22 | 2016-03-30 | Giesecke & Devrient GmbH | Device for outputting and/or receiving ultrasound and ultrasound sensor for inspecting a valuable document |
Also Published As
Publication number | Publication date |
---|---|
DE3734070C2 (en) | 1990-11-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |