DE1769147B1 - Process for the production of molded articles from elastic, already crosslinked or largely crosslinked and granulated polyurethanes - Google Patents
Process for the production of molded articles from elastic, already crosslinked or largely crosslinked and granulated polyurethanesInfo
- Publication number
- DE1769147B1 DE1769147B1 DE19681769147D DE1769147DA DE1769147B1 DE 1769147 B1 DE1769147 B1 DE 1769147B1 DE 19681769147 D DE19681769147 D DE 19681769147D DE 1769147D A DE1769147D A DE 1769147DA DE 1769147 B1 DE1769147 B1 DE 1769147B1
- Authority
- DE
- Germany
- Prior art keywords
- polyurethane
- crosslinked
- polyurethanes
- granulated
- hours
- 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
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/12—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by dry-heat treatment only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
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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
- C08G18/82—Post-polymerisation treatment
-
- 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
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Polyurethanes Or Polyureas (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
Es ist überraschend, daß entgegen der bisherigen Vorstellungen ein getempertes, also bereits vernetztes Polyurethan zum Fliesen gebracht werden kann, wie es für die thermischen Verarbeitungsverfahren erforderlich ist. Wenn ein Polyurethan bisher thermoplastischen Verarbeitungsverfahren unterworfen wurde, war man stets darauf bedacht, eine Vernetzung vor der Herstellung des Granulats weitestgehend auszuschlie#en. Das wurde erreicht, indem man die bei der Herstellung des Granulats gewonnene Schmelze auf einer Temperatur von weniger als 150°C hielt und nach Erreichen einer vorbestimmten Reaktionstemperatur die Schmelze möglichst schnell abschreckte. Fehlfabrikate von getemperten Polyurethanen wurden stets einem Regeneriervorgang unterworfen. It is surprising that, contrary to previous ideas, one tempered, i.e. already cross-linked polyurethane can be brought to the tile, as required for thermal processing methods. If a polyurethane previously thermoplastic Has been subjected to processing procedures, One was always careful to cross-link before producing the granulate largely excluded. That was achieved by taking care of the manufacture Melt obtained from the granulate was kept at a temperature of less than 150 ° C and after reaching a predetermined reaction temperature, the melt, if possible quickly deterred. Defective products of tempered polyurethanes always became one Subject to regeneration process.
Für das erfindungsgemäße Verfahren ist es ohne Bedeutung, ob das Elastomer im Ein- oder im Zweistufenverfahren hergestellt worden ist. Wesentlich jedoch ist, daß die zunächst erhaltene Schmelze nach dem Abkühlen, jedoch vor oder nach dem Granulieren einer mehrstündigen Temperaturbehandlung unterworfen wird. Hierbei tritt, wie bekannt, eine weitgehende Vernetzung des Polyurethans ein. Wird das so vorbehandelte Granulat nur schnell auf eine Temperatur im Bereich zwischen 150° C und der Zersetzungstemperatur des jeweils verwendeten Polyurethans - diese Temperatur ist für die einzelnen Polyurethantypen bekannt - erwärmt, so wird ein Zustand erreicht, in das Polyurethan unter Druck verformbar ist. For the method according to the invention, it is of no importance whether the Elastomer has been produced in a one- or two-step process. Essential however, that the melt initially obtained after cooling, but before or after granulating is subjected to a temperature treatment for several hours. Here As is known, extensive crosslinking of the polyurethane occurs. Will it be like that? pretreated granules only quickly to a temperature in the range between 150 ° C and the decomposition temperature of the polyurethane used in each case - this temperature is known for the individual polyurethane types - when heated, a state is reached is deformable under pressure into the polyurethane.
Bei einem solchen Verfahren entstehen allem Anschein nach zusätzliche Vernetzungsstellen, was sich am Endprodukt durch einen Abfall der Dehnung bei gleichzeitigem Ansteigen der Festigkeit bemerkbar macht. In folgenden Ausführungsbeispielen wird die Erfindung näher erläutert: Ausführungsbeispiel 1 1000 Gewichtsteile Polyester aus 1,6-Hexandiol, Neopentylglykol + Adipinsäure.Such a procedure would appear to generate additional ones Networking points, which is reflected in the end product by a decrease in elongation at the same time Increase in strength noticeable. In the following exemplary embodiments the invention explained in more detail: Embodiment 1 1000 parts by weight of polyester from 1,6-hexanediol, neopentyl glycol + adipic acid.
850 Gewichtsteile 4,4'-Diphenylmethandiisocyanat. 850 parts by weight of 4,4'-diphenylmethane diisocyanate.
240 Gewichtsteile 1,4-Butandiol.
850 Gewichtsteile 4,4'-Diphenylmethandiisocyanat. 850 parts by weight of 4,4'-diphenylmethane diisocyanate.
240 Gewichtsteile 1,4-Butandiol.
850 Gewichtsteile 4,4'-Diphenylmethandiisocyanat. 850 parts by weight of 4,4'-diphenylmethane diisocyanate.
240 Gewichtsteile 1,4-Butandiol.
Aus der Schmelze wurden Platten gegossen und diese 24 Stunden bei 110°C getempert. Die Prüfung der physikalischen Zahlen ergab die in der Tabelle aufgeführten Werte. Plates were poured from the melt and these for 24 hours Annealed at 110 ° C. The examination of the physical numbers resulted in those in the table listed values.
Sodann wurden die 24 Stunden bei 110°C getemperten Platten granuliert, im Spritzgut verarbeitet und die Prüfkörper einer erneuten Temperung von 24 Stunden bei 110°C unterworfen. Die physikalischen Zahlen sind ebenfalls in der nachfolgenden Tabelle verzeichnet. The plates, which had been tempered at 110 ° C. for 24 hours, were then granulated, processed in the spray material and the test specimens a renewed tempering of 24 hours subjected at 110 ° C. The physical numbers are also in the following Table listed.
Im Vergleich hierzu wurden ferner Prüfkörper im Spritzgutverfahren hergestellt, jedoch mit der Abwandlung, daß die Schmelze nach Erreichen einer Reaktionstemperatur von 130°C rasch abgekühlt und granuliert wurde. Die im Spritzgußverfahren hergestellten Prüfkörper wurden sodann ebenfalls einer Temperung bei 110°C in 24 Stunden unterworfen. In comparison, test specimens were also used in Injection molding process produced, but with the modification that the melt after reaching a reaction temperature was cooled rapidly from 130 ° C and granulated. Those manufactured by injection molding Test specimens were then also subjected to tempering at 110 ° C. for 24 hours.
Die Beispiele in den verschiedenen Rezepturen zeigen, daß eine weitgehende Vernetzung des Polyurethanelastomers vor der Verarbeitung im Spritzgußverfahren wesentliche Vorteile bringt, so daß also nicht nur Abfälle vernetzter Polyurethanelastomerer in vorteilhafter Weise verarbeitet werden können, sondern in vielen Anwendungsfällen eine Vernetzung des bereits hergestellten Granulats zur Verbesserung der physikalischen Eigenschaften wünschenswert erscheint. The examples in the various recipes show that there is one that is far-reaching Crosslinking of the polyurethane elastomer before processing in the injection molding process brings significant advantages, so that not only waste crosslinked polyurethane elastomers can be processed in an advantageous manner, but in many applications a cross-linking of the already produced granulate to improve the physical Properties appears desirable.
Claims (4)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1769147 | 1968-04-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1769147B1 true DE1769147B1 (en) | 1972-02-03 |
Family
ID=5700009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19681769147D Pending DE1769147B1 (en) | 1968-04-11 | 1968-04-11 | Process for the production of molded articles from elastic, already crosslinked or largely crosslinked and granulated polyurethanes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1769147B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4165307A (en) * | 1977-04-11 | 1979-08-21 | Dai Nippon Ink & Chemicals Incorporated | Process for preparation of molding resins |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1152253B (en) * | 1961-05-08 | 1963-08-01 | Phoenix Gummiwerke Ag | Process for the production of molded bodies based on polyester urethanes using polyester urethane waste |
-
1968
- 1968-04-11 DE DE19681769147D patent/DE1769147B1/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1152253B (en) * | 1961-05-08 | 1963-08-01 | Phoenix Gummiwerke Ag | Process for the production of molded bodies based on polyester urethanes using polyester urethane waste |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4165307A (en) * | 1977-04-11 | 1979-08-21 | Dai Nippon Ink & Chemicals Incorporated | Process for preparation of molding resins |
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