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DE19837682A1 - Recovery of mixed polyamide and polyethylene waste involves processing by chopping and extrusion and extrusion in an inert atmosphere to obtain a homogenous product for granulation and reuse - Google Patents

Recovery of mixed polyamide and polyethylene waste involves processing by chopping and extrusion and extrusion in an inert atmosphere to obtain a homogenous product for granulation and reuse

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Publication number
DE19837682A1
DE19837682A1 DE1998137682 DE19837682A DE19837682A1 DE 19837682 A1 DE19837682 A1 DE 19837682A1 DE 1998137682 DE1998137682 DE 1998137682 DE 19837682 A DE19837682 A DE 19837682A DE 19837682 A1 DE19837682 A1 DE 19837682A1
Authority
DE
Germany
Prior art keywords
extrusion
inert atmosphere
processing
chopping
granulation
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.)
Withdrawn
Application number
DE1998137682
Other languages
German (de)
Inventor
Martina Lehmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RECYCLING ZENTREN BRANDENBURG
Original Assignee
RECYCLING ZENTREN BRANDENBURG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RECYCLING ZENTREN BRANDENBURG filed Critical RECYCLING ZENTREN BRANDENBURG
Priority to DE1998137682 priority Critical patent/DE19837682A1/en
Publication of DE19837682A1 publication Critical patent/DE19837682A1/en
Withdrawn legal-status Critical Current

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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
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • 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
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/20—Recycled plastic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • 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)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Mixed polyethylene and polyamide waste, e.g. film, containing at least 5% of one component, is processed as usual by chopping and compaction. The mixture is extruded in an inert atmosphere at 180-250 deg C to obtain a homogenous product, which is then granulated for use in normal thermoplastic processing applications.

Description

Die Erfindung betrifft ein Verfahren zur Online-Verarbeitung von Altkunststoffen aus Polyamid - und Polyethylen -Abfällen durch Behandlung von Abfällen in der üblichen Weise wie Zerkleinerung, Kompaktierung und Extrusion, welches insbesondere auf Einschnecken- als auch auf Doppelschneckenextrudern mit gebräuchlichen Schneckenkon­ figurationen durchgeführt werden kann.The invention relates to a method for online processing of used plastics Polyamide and polyethylene waste by treating waste in the usual way such as crushing, compacting and extrusion, which in particular Single screw and twin screw extruders with common screw cones figurations can be performed.

Der physikalische Verbund von Polyolefinen (PO)/Polyethylen (PE) und Polyamiden (PA) ist in ein homogenes Regranulat zu überführen, wobei die Einzelkomponenten in nicht anteilsge­ rechter Verteilung die wesentlichen Eigenschaften der daraus entstehenden neuen Werkstoffe bestimmen.The physical combination of polyolefins (PO) / polyethylene (PE) and polyamides (PA) is to convert into a homogeneous regranulate, the individual components in non-proportionate right distribution the essential properties of the resulting new materials determine.

Die bisher bekannten Verfahren und Vorrichtungen verändern entweder technologisch oder durch Modifikationen unter Einsatz von Additiven physikalisch vermengte Polymere, jedoch nicht deren Verbunde.The previously known methods and devices either change technologically or through modifications using additives physically blended polymers, however not their groups.

Die in der Literatur beschriebenen Verfahren zeigen entweder die Wiederaufarbeitung von reinen Produkten, wie PA oder PE (DE 44 30 663 A1), (OS 26 07 345-Polyesterpolymerisate) und in dem Patent DE 41 22 382 werden Bearbeitungen von unverträglichen Kunststoffen durch Extrusion beschrieben, sowie die daraus hergestellten Gemische und deren Verwendung.The methods described in the literature either show the reprocessing of pure products, such as PA or PE (DE 44 30 663 A1), (OS 26 07 345 polyester polymers) and in the patent DE 41 22 382 processing of incompatible plastics described by extrusion, and the mixtures prepared therefrom and their Use.

Hierbei sollen besonders Recyclings von Kunststoffen aus Industrie-, Haushalts- und Gewerbemüll eingesetzt werden.Here, recycling of plastics from industrial, household and Commercial waste can be used.

In der Untersuchung zu PE-PA Verbundfolienresten - Eigenschaften und Grenzen der Verwertbarkeit (Zeitschrift, Kunststoff Nr. 83, 1993/5,Karl Hanser-Verlag, München 1993, von R.-E. Grützner, R. Gärtner, Rudolstadt-Schwarza u. H.-G. Hock, Wiesbaden) werden die Probleme der Bearbeitung von Mischmaterialien bei Kombination der beiden an­ geführten Kunststoffe in Mischungsverhältnissen von 70% PE und 30% PA 6 beschrieben, wobei besonders das Auftreten der gelben bis braunen Verfärbung der Produkte, der unterschiedlich elastischen Stränge und bei Anteil von duroplastischen Klebern ein instabiler Lauf mit Strangabrissen und zusätzlichen Ablagerungen an der Verspinnungsdüse festgestellt wurden. In the investigation of PE-PA composite film residues - properties and limits of Usability (magazine, plastic No. 83, 1993/5, Karl Hanser-Verlag, Munich 1993, by R.-E. Grützner, R. Gärtner, Rudolstadt-Schwarza u. H.-G. Hock, Wiesbaden) will address the problems of processing mixed materials when combining the two guided plastics in mixing ratios of 70% PE and 30% PA 6 described, in particular the appearance of the yellow to brown discoloration of the Products with different elastic strands and with a proportion of thermosetting Glue an unstable barrel with strand breaks and additional deposits on the Spinning nozzle were found.  

Daraus ist zu entnehmen, daß die Verarbeitung von Polyamid- und Polyethylenrecycling­ materialien grundsätzliche Probleme aufwerfen, die sich in Endformungsverhalten, Veränderung der morphologischen Struktur und der UV- und Thermostabilität darstellen. Auch die in der DE 41 22 382 erstmals angebotene Lösung, unverträgliche Kunststoffe miteinander zu verarbeiten, geht nach dieser Variante nur so, daß eine Trennung der Mischung in zwei Teile erfolgt, wobei der erste Teil aus einheitlichen Material besteht und der zweite Teil einer Weiterverarbeitung unterworfen wird, die zu einer Oberflächen­ vergrößerung und Veränderung der Bestandteile führen muß, unter anschließender Zusammenführung beider Teile zu einer Mischung. Diese ist im Wesentlichen gleichmäßig verteilt, so daß durch die gleichmäßige Verteilung ein einheitlicheres Produkt entstehen kann.It can be seen from this that the processing of polyamide and polyethylene recycling materials pose fundamental problems that can be Represent changes in the morphological structure and the UV and thermal stability. Also the solution offered for the first time in DE 41 22 382, incompatible plastics According to this variant, processing with one another is only possible in such a way that the Mixing takes place in two parts, the first part consisting of uniform material and the second part is subjected to further processing which leads to a surface enlargement and modification of the components must result, followed by Merging both parts into a mixture. This is essentially uniform distributed so that a more uniform product can result from the even distribution.

Ziel der Erfindung ist es, unter einen hohen Anteil von Komponenten an PE und PN wobei als untere Grenze für jeden Anteil 5% angegeben werden, immer ein homogenes und einheitliches Produkt zu erzeugen, das ohne Einschränkungen weiter verwertbar ist. Der physikalische Verbund PE/PA ist in ein homogenes Regranulat zu überführen, wobei die Einzelkomponenten in nicht anteilsgerechter Verteilung die Endeigenschaften der neuen Werkstoffe bestimmen.The aim of the invention is to take a high proportion of components of PE and PN the lower limit for each share is 5%, always a homogeneous and to produce a uniform product that can be used without restrictions. The physical bond PE / PA is to be converted into a homogeneous regranulate, whereby the individual components in a non-proportionate distribution the final properties of the new Determine materials.

Dabei soll das beschriebene Verfahren eine homogene Verteilung der Ausgangspolymere in sich, mit verbesserten Eigenschaften der PE-Komponente, als auch die Vermeidung von thermischen Abbauprozessen der PA-Komponente vereinigen.The method described is intended to have a homogeneous distribution of the starting polymers itself, with improved properties of the PE component, as well as the avoidance of Combine thermal degradation processes of the PA component.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß die Ausgangsmaterialien PE u. PN die bereits einen physikalischen Verbund darstellen, in üblicher Weise zerkleinert und kom­ paktiert werden und danach unter Inertatmosphäre extrudiert werden. Dabei ist es unerheblich, ob Additive oder Modifikatoren eingesetzt wurden oder werden.According to the invention the object is achieved in that the starting materials PE u. PN that already represent a physical network, crushed and com in the usual way be compacted and then extruded under an inert atmosphere. It is irrelevant whether additives or modifiers were or are used.

Erfindungsgemäß funktioniert das Verfahren bei einer Zusammensetzung von mehr als 5% PA- oder PE-Anteil, das in der vorgenannten Weise behandelt und unter inerter Atmosphäre bei 180-250°C zu einen nichtphasengetrennten Produkt verarbeitet wird, welches danach granuliert und in allen klassischen thermoplastischen Verarbeitungsverfahren eingesetzt werden kann. According to the invention, the method works with a composition of more than 5% PA or PE portion treated in the above manner and under an inert atmosphere is processed at 180-250 ° C to a non-phase separated product, which then granulated and used in all classic thermoplastic processing processes can be.  

Zur Erläuterung werden nachfolgend Ausführungsbeispiele dargelegt:
Exemplary embodiments are set out below for explanation:

  • 1. Ein Folienabfallgemisch aus PE/PA aus der Verbundfolienherstellung für Lebensmittelverpackungen wird auf einer Trockenmühle zerkleinert und auf einem Einschneckenextruder (D = 25 mm) mit einer Drehzahl von 85 MPM, bei einer Temperatur von 200-250°C, extrudiert.
    (Produkt 1)    1. A film waste mixture of PE / PA from composite film production for food packaging is crushed on a dry mill and extruded on a single-screw extruder (D = 25 mm) at a speed of 85 MPM, at a temperature of 200-250 ° C.
    (Product 1)
  • 2. Ein PE/PA-Folienabfallgemisch aus der Verbundfolienherstellung wird auf einer Mühle zerkleinert, kompaktiert und auf einen Einschneckenextruder (D = 25 mm) mit einer Drehzahl von 105 MPM, bei einer Temperatur von 180-240°C extrudiert,
    (Produkt 2).    2. A PE / PA film waste mixture from the composite film production is crushed on a mill, compacted and extruded on a single-screw extruder (D = 25 mm) at a speed of 105 MPM, at a temperature of 180-240 ° C,
    (Product 2).
  • 3. Ein PE/PA-Folienabfallgemisch wird zerkleinert, kompaktiert und zu 30 Teilen mit zerkleinerten Altfolien aus HDPE gemischt, auf einen Einschneckenextruder (D = 25 mm) bei einer Temperatur von 180-250°C extrudiert.
    (Produkt 3)    3. A PE / PA film waste mixture is crushed, compacted and 30 parts mixed with shredded old films made of HDPE, extruded on a single-screw extruder (D = 25 mm) at a temperature of 180-250 ° C.
    (Product 3)
  • 4. Ein Folienabfallgemisch aus PE/PA wird zerkleinert und zu jeweils 10 und 20 Teilen mit handelsüblichen Kreidebatch CC 89 (Cabot) versetzt und extrudiert.
    (Produkt 4 und 5).    4. A film waste mixture made of PE / PA is crushed and mixed with commercial chalk batch CC 89 (Cabot) in 10 and 20 parts each and extruded.
    (Product 4 and 5).

Nachfolgend sind die mit dieser Versuchsdurchführung erzielten physikalischen Werte dargelegt:
The physical values achieved with this test procedure are set out below:

Claims (3)

1. Verfahren zur Online-Verarbeitung von Altkunststoffen aus PA- uPE-Abfällen durch die übliche Verarbeitung wie Zerkleinerung, Kompaktierung und Extrusion, dadurch gekennzeichnet, daß das PE- u. PA-Abfallmaterial in einer Zusammensetzung von mehr als 5% PA- oder PE-Anteil zerkleinert, kompaktiert und danach in inerter Atmosphäre bei 180-250°C ohne weitere Zusätze zu einem nichtphasengetrennten Produkt verarbeitet wird, welches nachfolgend granuliert und in allen klassischen thermoplastischen Verarbeitungsverfahren einsetzbar ist.1. Process for online processing of waste plastics from PA-uPE waste by the usual processing such as crushing, compacting and extrusion, characterized in that the PE u. PA waste material in a composition of more than 5% PA or PE content is crushed, compacted and then processed in an inert atmosphere at 180-250 ° C without further additives to a non-phase-separated product, which is subsequently granulated and in all classic thermoplastic processing methods can be used. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß eine Stabilisierung und /oder Neutralisierung von niedermolekularen Bestandteilen bei thermischer Belastung durch die physikalische Bindung hochdisperser Oberflächen von Füllstoffen, vorzugsweise durch Calciumcarbonat, Bariumsulfat und/oder Al-Silikate erfolgt.2. The method according to claim 1, characterized, that stabilization and / or neutralization of low molecular weight Ingredients with thermal stress due to the physical bond of highly disperse Surfaces of fillers, preferably calcium carbonate, barium sulfate and / or Al silicates. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Erzielung eines homogenen Eigenschaftsbildes nur durch verarbeitungstechnologische Parametereinstellung erfolgt.3. The method according to claim 1, characterized in that the achievement of a homogeneous property picture only by processing-technological parameter setting takes place.
DE1998137682 1998-08-19 1998-08-19 Recovery of mixed polyamide and polyethylene waste involves processing by chopping and extrusion and extrusion in an inert atmosphere to obtain a homogenous product for granulation and reuse Withdrawn DE19837682A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1998137682 DE19837682A1 (en) 1998-08-19 1998-08-19 Recovery of mixed polyamide and polyethylene waste involves processing by chopping and extrusion and extrusion in an inert atmosphere to obtain a homogenous product for granulation and reuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998137682 DE19837682A1 (en) 1998-08-19 1998-08-19 Recovery of mixed polyamide and polyethylene waste involves processing by chopping and extrusion and extrusion in an inert atmosphere to obtain a homogenous product for granulation and reuse

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DE19837682A1 true DE19837682A1 (en) 2000-02-24

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DE1998137682 Withdrawn DE19837682A1 (en) 1998-08-19 1998-08-19 Recovery of mixed polyamide and polyethylene waste involves processing by chopping and extrusion and extrusion in an inert atmosphere to obtain a homogenous product for granulation and reuse

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2030749A3 (en) * 2007-08-31 2010-11-10 ISR Interseroh Rohstoffe GmbH Method for manufacturing spun fibres and staple fibres from compound film pieces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2030749A3 (en) * 2007-08-31 2010-11-10 ISR Interseroh Rohstoffe GmbH Method for manufacturing spun fibres and staple fibres from compound film pieces

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