DE4324830A1 - Process for the recycling of coated plastic material, and the use thereof - Google Patents
Process for the recycling of coated plastic material, and the use thereofInfo
- Publication number
- DE4324830A1 DE4324830A1 DE19934324830 DE4324830A DE4324830A1 DE 4324830 A1 DE4324830 A1 DE 4324830A1 DE 19934324830 DE19934324830 DE 19934324830 DE 4324830 A DE4324830 A DE 4324830A DE 4324830 A1 DE4324830 A1 DE 4324830A1
- Authority
- DE
- Germany
- Prior art keywords
- plastic material
- bath
- acid
- sulfuric acid
- paint
- 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
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000004033 plastic Substances 0.000 title claims abstract description 35
- 229920003023 plastic Polymers 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 14
- 235000011149 sulphuric acid Nutrition 0.000 claims abstract description 8
- 238000010306 acid treatment Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000003973 paint Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 6
- 239000004922 lacquer Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 claims description 2
- 229910000342 sodium bisulfate Inorganic materials 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims 2
- 239000013543 active substance Substances 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 claims 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 229920000515 polycarbonate Polymers 0.000 description 9
- 239000004417 polycarbonate Substances 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000012958 reprocessing Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 241001676573 Minium Species 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- METKIMKYRPQLGS-UHFFFAOYSA-N atenolol Chemical compound CC(C)NCC(O)COC1=CC=C(CC(N)=O)C=C1 METKIMKYRPQLGS-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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
- B29B17/02—Separating plastics from other materials
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- 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
- 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
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0293—Dissolving the materials in gases or liquids
-
- 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
- B29K2069/00—Use of PC, i.e. polycarbonates 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
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
-
- 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
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
- B29K2705/02—Aluminium
-
- 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
- B29L2009/005—Layered products coated
-
- 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
- B29L2017/00—Carriers for sound or information
- B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
- B29L2017/003—Records or discs
- B29L2017/005—CD''s, DVD''s
-
- 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
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Wiederverwertung (Recycling) von beschichtetem Kunststoffmaterial durch Säurebehandlung sowie an schließendem Spülen und Trocknen, insbesondere von Kunststoffen, die auf Polycarbonatbasis hergestellt sind.The invention relates to a method for reuse (recycling) of coated plastic material by acid treatment as well closing rinsing and drying, especially of plastics that are made on a polycarbonate basis.
Die Wiederaufarbeitung von beschichteten Kunststoffkörpern, z. B für die Abfallbeseitigung von Audio-Compaktdisks, stellt ein erhebliches Problem dar, wobei derartige Kunststoffe auch in vielen anderen Be reichen der Technik mit Aluminium- oder Aluminium-Kupfer-Legierungen in Hochvakuum-Dünnschichttechnik beschichtet sind und gegebenenfalls noch weitere Lackschichten, z. B. durch Bedrucken dieser metallbe schichteten Kunststoffkörper oder als Haftvermittler, enthalten.The reprocessing of coated plastic bodies, e.g. B for The waste disposal of audio compact discs represents a significant one Problem is, such plastics in many other Be range of technology with aluminum or aluminum-copper alloys are coated in high vacuum thin film technology and if necessary even more layers of paint, e.g. B. by printing this metallbe layered plastic body or as an adhesion promoter.
Da bei der Fabrikation von Compaktdisks eine ca. 10%ige Ausschußrate entsteht, ist die Behandlung dieser beschichteten Kunststoffabfälle und die saubere, rasche Entschichtung des wiederwendbaren Kunststoff materiales aus Polycarbonat oder Polyestercarbonat von besonderer Be deutung.Since there is an approx. 10% reject rate in the production of compact discs is the treatment of this coated plastic waste and the clean, quick stripping of the reusable plastic material made of polycarbonate or polyester carbonate of special Be interpretation.
Ähnliche Wiederverwertungsaufgaben stellen sich z. B. bei der Wieder verwertung beschichteter Brillengläser, von metallbeschichteten Re flektorwänden oder ähnlichem.Similar recycling tasks arise e.g. B. in the re recycling of coated glasses, of metal coated re reflector walls or the like.
Aus der DE-OS 35 11 711 ist ein Verfahren zur Wiederaufarbeitung der artiger hochwertiger, beschichteter Kunststoffmaterialien aus Kunst stoffabfällen und Ausschußwerkstoffen bekannt, bei dem das zu bear beitende Gut granuliert wird. Die Beschichtung soll von diesem Granu lat alkalisch entfernt werden. Auf diese Weise kann nur ein Sekundär werkstoff mit niedriger Qualität hergestellt werden, da das Ent schichtungsproblem auf diese Weise nicht vollständig und mit hinrei chender Produktivität gelöst werden kann und vielfach Beschichtungs reste verbleiben.DE-OS 35 11 711 describes a process for reprocessing the like high-quality, coated plastic materials made of art waste and scrap materials known to bear processing material is granulated. The coating is said to be from this granu be removed latically alkaline. In this way, only a secondary low quality material because the Ent stratification problem in this way not completely and with appropriate productivity and often coating remains remain.
Aus der DE-OS 14 22 813 ist ein Verfahren zur Entfernung der Haft schicht von fotografischen Polycarbenatfilmen bekannt, bei dem diese in eine verdünnte, wäßrige Lösung von grenzflächenaktiven Substanzen und/oder organischen Carbonsäuren, Hydroxycarbonsäuren, Sulfonsäuren oder deren Salzen gegeben werden. Ein solches Verfahren eignet sich allerdings nicht für die Wiederaufarbeitung metallbeschichteter Kunststoffe.From DE-OS 14 22 813 is a method for removing the detention layer of photographic polycarbenate films known in which this in a dilute aqueous solution of surfactants and / or organic carboxylic acids, hydroxycarboxylic acids, sulfonic acids or their salts are given. Such a method is suitable but not for the reprocessing of metal-coated Plastics.
Aus der EP-A 0 476 475 ist ein Verfahren zur Reinigung von Polycarbonat- und Polyestercarbonatabfällen, wie z. B. Compactdisks bekannt, bei dem die beschichteten Kunststoffkörper zunächst zu Bruchstücken zerkleinert, diese Bruchstücke danach mit niedrig kon zentrierter Säure unter Rühren erhitzt, anschließend gewaschen sowie mit Wasser nachgespült werden, bis alle von dem Kunststoff abgetrenn ten Lackanteile ausgespült und abfiltriert sind. Das geshredderte Kunststoffmaterial wird schließlich getrocknet.EP-A 0 476 475 describes a process for cleaning Polycarbonate and polyester carbonate waste such as B. Compact disks known, in which the coated plastic body initially Crushed fragments, then these fragments with low con centered acid heated with stirring, then washed and rinsed with water until all are separated from the plastic parts of the paint are rinsed out and filtered. The shredded Plastic material is finally dried.
Hierbei ist allerdings die restlose Beseitigung der Lackschichten schwierig, da diese durch die vorangegangene chemische Säurebehand lung nicht vollständig aufgelöst werden, so daß ein qualitativ unge nügender, noch Restbeschichtungen aufweisender Materialverbund ver bleibt. Die Effizienz dieses Verfahrens ist daher nicht so groß, wie gewünscht und es ist mit diesem Verfahren auch nicht möglich, unzer kleinerte Metall- und/oder lackbeschichtete Kunststoffkörper wie z. B. Compactdisks, rasch und wirtschaftlich zu entschichten und so dann die Kunststoff-Grundkörper einer unmittelbaren wirtschaftlichen Wie derverwendung zuzuführen.Here, however, is the complete removal of the paint layers difficult as this is due to the previous chemical acid treatment tion can not be completely resolved, so that a qualitatively unsound sufficient material composite that still has residual coatings remains. The efficiency of this process is therefore not as great as desired and it is also not possible with this procedure smaller metal and / or paint-coated plastic bodies such as B. Compact disks to be decoated quickly and economically and so then the plastic base body of an immediate economic how to be used.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der vorgenannten Art zu verbessern derart, daß die Entschichtungsqualität bei der Wiederaufarbeitung des beschichteten Kunststoffmateriales be deutend erhöht und die Prozeßdauer beträchtlich abgekürzt werden sowie die erhaltene Rohstoffqualität nicht durch Verunreinigungen beein trächtigt wird. Überdies soll das Verfahren auch dann wirksam sein, wenn das Kunststoffmaterial nicht vorher zerkleinert wird.The invention is therefore based on the object of a method of to improve the aforementioned type such that the stripping quality be in the reprocessing of the coated plastic material significantly increased and the process time considerably shortened as well the raw material quality obtained is not affected by impurities is pregnant. In addition, the method should also be effective if the plastic material is not shredded beforehand.
Die vorgenannte Aufgabe wird erfindungsgemäß dadurch gelöst, daß das beschichtete Kunststoffmaterial in ein Säurebad aus konzentrierter Schwefelsäure H₂SO₄ erhöhter Temperatur gegeben wird. The above object is achieved in that the coated plastic material in an acid bath from concentrated Sulfuric acid H₂SO₄ increased temperature is given.
Vorzugsweise weist das beschichtete Kunststoffmaterial eine Metall- und/oder Lackbeschichtung auf und wird das Säurebad aus mehr als 80%iger Schwefelsäure gebildet, dessen Temperatur zwischen 30° und 90°C beträgt.The coated plastic material preferably has a metal and / or paint coating and the acid bath is made of more than 80% sulfuric acid formed, the temperature between 30 ° and Is 90 ° C.
Nach einer weiteren bevorzugten Ausführungsform der Erfindung wird gegebenenfalls im Anschluß an ein Zwischenspülen, nach der Säurebe handlung ein weiteres Prozeßbad angeschlossen, das spezielle Lackent ferner und/oder grenzflächenaktive Mittel enthält.According to a further preferred embodiment of the invention optionally after an intermediate rinse, after the acid level another process bath connected, the special paint detergent further contains and / or surfactants.
Das erfindungsgemäße Säure-Entschichtungsverfahren unter Verwendung hochwirksamer, konzentrierter Schwefelsäure kann nach einer weiteren, bevorzugten Ausführungsform der Erfindung auch mit einem mechanischen Schleifvorgang zum Entfernen der Lack- und/oder Metallschichten kom biniert werden.The acid stripping process according to the invention using highly effective, concentrated sulfuric acid can be preferred embodiment of the invention also with a mechanical Sanding process to remove the paint and / or metal layers com be binated.
Für die Entschichtung kann das Kunststoffmaterial entweder vorher ge shreddert werden oder es können komplette Kunststoffkörper, wie z. B. Compactdisks, verwendet werden, die anschließend, nach Auflösen der Metall- und Lackschichten als Polycarbonat-Rohstoffkörper weiterer Verwendung zugeführt werden.The plastic material can either be removed beforehand shredded or complete plastic body, such as. B. Compact disks, which are then used after dissolving the Metal and lacquer layers as polycarbonate raw material bodies more Use can be supplied.
Weitere, bevorzugte Ausgestaltungen des Erfindungsgegenstandes sind in den übrigen Ansprüchen dargelegt.Further preferred configurations of the subject matter of the invention are set out in the remaining claims.
Erfindungsgemäß werden die beschichteten Kunststoffkörper entweder zerkleinert oder aber auch unzerkleinert in ein Schwefelsäurebad mit einer Konzentration von mindestens 900 g/l eingebracht, wobei die Bad temperatur vorzugsweise mehr als 20°C beträgt. Mit zunehmender Tempe ratur und Konzentration des Schwefelsäurebades verbessert sich das Entschichtungsergebnis, bevorzugte Verfahrensbedingungen wurden bei 40°C und ca. 1.700 g/H₂SO₄/l ermittelt.According to the coated plastic body either crushed or also uncrushed in a sulfuric acid bath a concentration of at least 900 g / l, the bath temperature is preferably more than 20 ° C. With increasing temp This improves the temperature and concentration of the sulfuric acid bath Decoating result, preferred process conditions were 40 ° C and about 1,700 g / H₂SO₄ / l determined.
Durch die vorteilhafte Nachbehandlung in einem weiteren Prozeßbad wird die Lackauflösung der Lackschichten beschleunigt und/oder die Oberflächenspannung vermindert. Der Kunststoffgrundkörper aus Poly carbonat wird durch das Entschichtungsverfahren nicht angegriffen. Hierbei ist von Bedeutung, daß bei dem erfindungsgemäßen Verfahren nicht alkalisch gearbeitet wird.Thanks to the advantageous aftertreatment in another process bath the paint dissolution of the paint layers is accelerated and / or Surface tension reduced. The plastic base made of poly carbonate is not attacked by the stripping process. It is important here that in the method according to the invention is not worked alkaline.
Die Anwendung des erfindungsgemäßen Verfahrens hat neben besonders günstigen Ergebnissen sowohl hinsichtlich der Metallschichtentfernung als auch der Lackschichtenentfernung zu überraschend kurzen erforder lichen Behandlungszeiten im Bereich von 5 bis 15 Minuten geführt.The application of the method according to the invention has in addition to particular favorable results both in terms of metal layer removal as well as the paint layer removal to surprisingly short treatment times in the range of 5 to 15 minutes.
Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles er läutert. Hierfür wurde eine Compactdisk ausgewählt, die bekannterma ßen einen Mehrschichtaufbau aus vier aufeinanderfolgenden Schichten besitzt. Träger der Audioinformation ist der Kunststoffgrundkörper aus Polycarbonat, der die unterste Schicht der CD bildet. Die Oberseite der Polycarbonatscheibe ist mit einer Aluminium- oder Alu miniumlegierung beschichtet, die auf die Polycarbonatscheibe aufge dampft ist und mittels einer auf die Aluminiumschicht aufgebrachten Lackschicht versiegelt ist. Diese Lackschicht wiederum ist mit Farb stoffen, z. B. einer Siebdruckschicht, bedruckt.The invention is based on an embodiment he purifies. For this, a compact disc was selected, which is known to a multi-layer structure consisting of four successive layers owns. The plastic body is the carrier of the audio information made of polycarbonate, which forms the bottom layer of the CD. The The top of the polycarbonate lens is with an aluminum or aluminum minium alloy coated on the polycarbonate lens is vaporized and by means of an applied to the aluminum layer Lacquer layer is sealed. This lacquer layer is in turn with color fabrics, e.g. B. a screen printing layer, printed.
Eine derartige Compactdisk wurde für 5 Minuten in ein Tauchbad mit 85%iger Schwefelsäure H₂SO₄ bei 50°C gegeben, vorzugsweise unter Rüh ren.Such a compact disc was placed in an immersion bath for 5 minutes 85% sulfuric acid H₂SO₄ given at 50 ° C, preferably with stirring ren.
Anschließend erfolgte für 2 Minuten ein Standspülen mit Wasser bei Raumtemperatur und hieran anschließend für ca. 2 Minuten ein Fließ spülen mit Kaltwasser, gefolgt von einem nochmaligen, 2-minütigen Heißwasser-Standspülen bei 80°C und anschließender Lufttrocknung. Die Compactdisks wurden hierbei in Trommeln durch die einzelnen Bäder geführt.This was followed by rinsing with water for 2 minutes Room temperature and then a flow for about 2 minutes rinse with cold water, followed by another 2 minutes Hot water standing rinsing at 80 ° C and subsequent air drying. The compact disks were drums through the individual baths guided.
Nach den genannten Verfahrensschritten wurde ein Polycarbonat-Grund körper erhalten, der unversehrt geblieben, jedoch von sämtlichen Schichten befreit ist. Dieser Kunststoffgrundkörper kann unmittelbar wieder verwendet oder auch eingeschmolzen werden.After the above-mentioned process steps, a polycarbonate base was used Preserved body that remained intact, but from all Layers is exempt. This plastic body can immediately reused or melted down.
Zur Erreichung einer besseren Oberflächenqualität und eines verbes serten Spüleffektes kann bei dem Spülen (Heißwasser-Standspülen bei 80°C) auch das Druckumflutungsverfahren angewendet oder bei der Um lufttrocknung eine Vakuumtrocknung verwendet werden. Bei einem ande ren Ausführungsbeispiel wurden die unzerkleinerten CD′s nach dem Stand- und Kaltwasserspülen in ein Prozeßbad bei 80°C gegeben, das 200 g NaHSO₄ pro Liter sowie 50 ml/l Natriumisoalkylsulfat sowie 50 ml/l Dipropylenglykol mit dem restlichen Anteil Wasser enthielt unter anschließender Rückführung zum Stand- und Fließwasserspülen sowie an schließendem Heißwasserspülen und Trocknung. Auch in diesem Fall wur de für besonders widerstandsfähige Lackbeschichtungen ein vollständi ges Entschichtungsergebnis erreicht.To achieve a better surface quality and a verb Serten rinsing effect can be during the rinsing (hot water standing rinsing 80 ° C) also applied the pressure flooding method or in the order air drying a vacuum drying can be used. With another Ren embodiment were the unreduced CD's after Stand and cold water rinsing in a process bath at 80 ° C, the 200 g NaHSO₄ per liter and 50 ml / l sodium isoalkyl sulfate and 50 ml / l dipropylene glycol with the remaining portion of water contained below subsequent return to rinsing and running water as well as to closing hot water rinsing and drying. In this case too de a complete solution for particularly resistant paint coatings Total stripping result reached.
Zur Vergrößerung der Angriffsfläche des Säurebades können die Com pactdisks selbstverständlich und vorzugsweise auch geshreddert in das Säurebad aus konzentrierter Schwefelsäure gegeben werden, das Shred dergut erwies sich ebenfalls als vollkommen schichtfrei nach ca. 10 bis 15 minütiger Behandlung nach den Verfahrensschritten im vorge nannten Beispiel.To enlarge the attack surface of the acid bath, the Com pactdisks of course and preferably also shredded into that Acid bath from concentrated sulfuric acid are added to the shred dergut also proved to be completely free of layers after approx. 10 up to 15 minutes of treatment according to the procedural steps in the pre named example.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934324830 DE4324830C2 (en) | 1993-07-23 | 1993-07-23 | Process for recycling coated plastic material and use of same |
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| Application Number | Priority Date | Filing Date | Title |
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| DE19934324830 DE4324830C2 (en) | 1993-07-23 | 1993-07-23 | Process for recycling coated plastic material and use of same |
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| Publication Number | Publication Date |
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| DE4324830A1 true DE4324830A1 (en) | 1995-01-26 |
| DE4324830C2 DE4324830C2 (en) | 1996-09-12 |
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| DE19934324830 Expired - Fee Related DE4324830C2 (en) | 1993-07-23 | 1993-07-23 | Process for recycling coated plastic material and use of same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO1997002327A1 (en) * | 1995-06-30 | 1997-01-23 | C2P | Method for processing a substrate |
| WO2001051266A1 (en) * | 2000-01-08 | 2001-07-19 | Messer Griesheim Gmbh | Method for recycling a plastic component being provided with a surface coating |
| EP1273414A1 (en) * | 2001-07-04 | 2003-01-08 | Cheng-Shu Chen | Method for recycling compact disks |
| WO2021152124A1 (en) * | 2020-01-31 | 2021-08-05 | Eoe Eyewear Ab | Eyewear recycling method and recycled material |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10259212C1 (en) * | 2002-12-17 | 2003-12-18 | Getzner Werkstoffe Holding Gmbh | Separation of composite containing polyurethane foam and polyethylene by crushing includes dissolution of polyurethane from contaminated polyethylene granulate in hot concentrated sulfuric acid bath |
| DE102009017802B4 (en) | 2009-04-20 | 2016-07-07 | Immprover Innovation Gmbh | paint removal |
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| WO1997002327A1 (en) * | 1995-06-30 | 1997-01-23 | C2P | Method for processing a substrate |
| WO2001051266A1 (en) * | 2000-01-08 | 2001-07-19 | Messer Griesheim Gmbh | Method for recycling a plastic component being provided with a surface coating |
| DE10000566A1 (en) * | 2000-01-08 | 2001-07-26 | Messer Griesheim Gmbh | Process for recycling a plastic component having a surface coating |
| EP1273414A1 (en) * | 2001-07-04 | 2003-01-08 | Cheng-Shu Chen | Method for recycling compact disks |
| WO2021152124A1 (en) * | 2020-01-31 | 2021-08-05 | Eoe Eyewear Ab | Eyewear recycling method and recycled material |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4324830C2 (en) | 1996-09-12 |
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