EP4072811A1 - Recyclage de matière plastique - Google Patents

Recyclage de matière plastique

Info

Publication number
EP4072811A1
EP4072811A1 EP20829826.5A EP20829826A EP4072811A1 EP 4072811 A1 EP4072811 A1 EP 4072811A1 EP 20829826 A EP20829826 A EP 20829826A EP 4072811 A1 EP4072811 A1 EP 4072811A1
Authority
EP
European Patent Office
Prior art keywords
vol
feedstock
previous
polyethylene
polymer
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
Application number
EP20829826.5A
Other languages
German (de)
English (en)
Inventor
René Bennet BORGGAARD
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.)
Gravenhorst Plast AS
Original Assignee
Gravenhorst Plast AS
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 Gravenhorst Plast AS filed Critical Gravenhorst Plast AS
Publication of EP4072811A1 publication Critical patent/EP4072811A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • 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
    • B29B2017/001—Pretreating the materials before recovery
    • B29B2017/0015—Washing, rinsing
    • 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

Definitions

  • Embodiments of the present invention relate to a method for recycling of mixtures of polymers and to a product prepared by such a method.
  • Plastic recycling is a process of recovering plastic waste and reprocessing of the material into new products. Since the majority of plastic is non-biodegradable, recycling of plastic is a part of global efforts to reduce plastic in the waste streams, and especially all the plastic waste entering the Earth's ocean every year.
  • plastic polymers recycling is often more challenging, both from an economical and technical perspective. Recycling collection processes for plastic generally tend to lump all plastic products together. When different types of plastics are molten together, they tend to phase-separate, like oil and water, and set in layers. The phase boundaries cause structural weaknesses in the resulting material, and polymer blends are thus useful in only limited applications. The two most widely manufactured plastics, polypropylene and polyethylene, behave this way, which limits their utility for recycling. The plastic material thus needs to be sorted before processing, which is a time consuming and expensive process.
  • Embodiments of the present invention address a need to provide a method for providing recycled blends of polymers, which recycled blends are structurally strong and useful for many applications, where one example is plastic furnitures.
  • a specific objective is to improve the process of recycling of polymer blends, reducing the need for sorting of the different polymers before recycling processing.
  • a method comprising providing a feedstock comprising at least a first and a second polymer, heating the feedstock at a temperature of about 130 °C to about 165 °C, preferably about 130 °C to about 160 °C, more preferably about 135 °C to about 145 °C, even more preferably about 140 °C, wherein the feedstock is heated during a time period of at least about 5 min, preferably about 5 min to about 180 min, more preferably about 5 min to about 100 min, even more preferably about 10 min to about 60 min, most preferably about 10 min to about 30 min.
  • the first and second polymer are not the same polymers.
  • the feedstock is broken down into a particulate mass before heating.
  • said breaking down the feedstock into a particulate mass comprises granulation, cutting, shredding and/or grinding.
  • the feedstock is subject to molding during and/or after the heating.
  • said molding of the feedstock comprises molding in a press.
  • the method further comprises cooling of the feedstock after the heating.
  • the method comprises cooling after the heating and/or molding, or alternatively during the molding.
  • said cooling is conducted at a temperature of about 30 °C to about 60 °C, preferably about 40 °C to about 50 °C.
  • said first polymer is selected from the group consisting of polyethylene and thermoplastic polyesters.
  • said second polymer is selected from the group consisting of polypropylene and silicone.
  • the feedstock comprises polyethylene and polypropylene.
  • the polymers of the feedstock consist of polyethylene and polypropylene.
  • the feedstock comprises polyethylene, polypropylene and silicone.
  • the polymers of the feedstock consist of polyethylene, polypropylene and silicone.
  • the feedstock further comprises paper.
  • the feedstock comprises about 40 vol.-% to about 90 vol.-% polyethylene and/or thermoplastic polyesters, preferably about 50 vol.-% to about 85 vol.-% polyethylene and/or thermoplastic polyesters, more preferably about 60 vol.-% to about 85 vol.-% polyethylene and/or thermoplastic polyesters.
  • the feedstock comprises at least 5 vol.-%, preferably at least 10 vol.-%, more preferably at least 15 vol.-%, of said second polymer.
  • said second polymer is polypropylene.
  • the feedstock comprises about 40 vol.-% to about 90 vol.-% polyethylene, preferably about 50 vol.-% to about 85 vol.-% polyethylene, more preferably about 60 vol.-% to about 85 vol.-% polyethylene and at least 5 vol.-%, preferably at least 10 vol.-%, more preferably at least 15 vol.-% polypropylene.
  • the feedstock comprises nylon.
  • the feedstock preferably comprises less than 20 vol.-% nylon, preferably less than 15 vol.-% nylon, more preferably less than 13 vol.-% nylon.
  • the feedstock is heated until it is in a semi-molten state.
  • the method is for plastic recycling. According to an aspect, the method is for producing plastic products using a mixture of at least two different polymers.
  • the method does not comprise a step of extrusion during and/or after the heating.
  • the feedstock does not comprise any organic and/or inorganic solvents.
  • the feedstock does not comprise sand.
  • the method comprises only one heating step.
  • the present invention relates to a plastic product obtained by a method according to the present invention.
  • FIG. 1 shows an example of an embodiment where a feedstock of the invention is heated in a container and molded in a press.
  • FIG 1 An embodiment of the invention is shown in FIG 1 , where a feedstock comprising at least a first and a second polymer is provided in a container.
  • the feedstock may be heated to a temperature of about 130 °C to about 165 °C, preferably about 130 °C to about 160 °C, more preferably about 135 °C to about 145 °C, even more preferably about 140 °C. If the temperatures that are used are high, such as e.g.
  • said first and/or second polymer in the feedstock may burn, and as a result will no longer be present in the final product, i.e. it will not be recycled.
  • the first and/or second polymer in the feedstock may work as a bonding agent, resulting in a strong and durable recycled polymer material.
  • the feedstock is heated during a time period of at least about 5 min, preferably about 5 min to about 180 min, more preferably about about 5 min to about 100 min, preferably about 10 min to about 60 min, more preferably about 10 min to about 30 min, letting the feedstock achieve a semi-molten stage.
  • the feedstock may be broken down into a particulate mass before the heating step. This may be conducted in many different ways, where preferable examples comprise granulation, cutting, shredding, and/or grinding.
  • the feedstock may be washed before the heating step. It is preferably washed after being broken down into the particulate mass.
  • the feedstock that has achieved a semi-molten stage may be subject to molding, e.g. using a press.
  • the solid arrows in FIG. 1 show how pressure is applied in a downward direction.
  • the heat-treated feedstock starts to leak into the space between the container where the feedstock is heated and the press used for molding, as can be seen by the dashed arrows in FIG. 1 .
  • the container and/or mold used for the method of the present invention may be lubricated using e.g. wax, which results in that the final product is easily removed from the container or mold.
  • the heated feedstock may be subject to cooling after the heating and/or molding. Alternatively, it may be subject to cooling during the molding. Said cooling may be conducted at temperatures of about 30 °C to about 60 °C, preferably about 40 °C to about 50 °C.
  • the heated feedstock may also be allowed to cool down without applying any cooling. The final product from the heated feedstock is easily removed when it has cooled down.
  • the first polymer is preferably selected from the group consisting of polyethylene and thermoplastic polyesters.
  • the second polymer of the feedstock may preferably be selected from the group consisting of polypropylene and silicone.
  • the feedstock comprises polyethylene and polypropylene.
  • the polymers of the feedstock consist of polyethylene and polypropylene.
  • the feedstock comprises polyethylene, polypropylene and silicone.
  • the polymers of the feedstock consist of polyethylene, polypropylene and silicone.
  • the feedstock may comprise paper.
  • the paper is preferably present in small amounts, preferably less than 5 vol.-%, e.g. less than 4 vol.-%, e.g. less than 3 vol.-%, e.g. less than 2 vol.-%, e.g. less than 1 vol.-%, of the feedstock.
  • the feedstock may, in one embodiment, comprise about 40 vol.-% to about 90 vol.-% polyethylene and/or thermoplastic polyesters, preferably about 50 vol.-% to about 85 vol.-% polyethylene and/or thermoplastic polyesters, more preferably about 60 vol.-% to about 85 vol.-% polyethylene and/or thermoplastic polyesters
  • the feedstock comprises about 40 vol.-% to about 90 vol.-% polyethylene, preferably about 50 vol.-% to about 85 vol.-% polyethylene, more preferably about 60 vol.-% to about 85 vol.-% polyethylene, as a first polymer.
  • the feedstock may comprise at least 5 vol.-%, preferably at least 10 vol.-%, more preferably at least 15 vol.-%, of said second polymer.
  • the feedstock may, in one embodiment, comprise at least 5 vol.-%, preferably at least 10 vol.-%, more preferably at least 15 vol.-%, polypropylene.
  • the feedstock comprises about 40 vol.-% to about 90 vol.- % polyethylene, preferably about 50 vol.-% to about 85 vol.-% polyethylene, more preferably about 60 vol.-% to about 85 vol.-% polyethylene and at least 5 vol.-%, preferably at least 10 vol.-%, more preferably at least 15 vol.-% polypropylene.
  • the feedstock comprising about 40 vol.-% to about 90 vol.- % polyethylene, preferably about 50 vol.-% to about 85 vol.-% polyethylene, more preferably about 60 vol.-% to about 85 vol.-% polyethylene and at least 5 vol.-%, preferably at least 10 vol.-%, more preferably at least 15 vol.-% polypropylene, also comprises silicone. Further, it may comprise paper, as mentioned above.
  • the feedstock may comprise nylon.
  • the nylon is preferably present in an amount of less than 20 vol.-% nylon, more preferably less than 15 vol.-% nylon, even more preferably less than 13 vol.-% nylon.
  • the feedstock may be heated until it reaches a semi-molten state.
  • the method does not comprise a step of extrusion after the heating, i.e. no extrusion process is conducted after the heating of the feedstock.
  • the method according to the present invention is thus not intended to be used before any extrusion processes.
  • the feedstock does not comprise any organic and/or inorganic solvents. This gives a more environmentally friendly method and product.
  • the feedstock does not comprise sand.
  • the heating of the feedstock may be conducted in one, two, three or more heating steps. According to an embodiment, the method comprises only one heating step.
  • the feedstock preferably comprises at least 50 vol.-% polymers.
  • the present invention also relates to a plastic product obtained by a method according to the present invention.
  • the products obtained by the method according to the present invention may have different color patterns, depending on the colors of the polymers of the plastic products in the polymer feedstock.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

L'invention concerne un procédé de recyclage de matière plastique comprenant l'utilisation d'une charge de départ comprenant au moins un premier polymère et un second polymère et le chauffage de la charge de départ à une température d'environ 130 °C à environ 165 °C, de préférence d'environ 130 °C à environ 160 °C, de préférence encore d'environ 135 °C à environ 145 °C, de préférence même encore d'environ 140 °C. La charge de départ est chauffée pendant une durée d'au moins environ 5 min, de préférence d'environ 5 min à environ 180 min, de préférence encore d'environ 5 min à environ 100 min, de préférence même encore d'environ 10 min à environ 60 min, idéalement d'environ 10 min à environ 30 min.
EP20829826.5A 2019-12-13 2020-12-11 Recyclage de matière plastique Pending EP4072811A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201970769 2019-12-13
PCT/EP2020/085780 WO2021116418A1 (fr) 2019-12-13 2020-12-11 Recyclage de matière plastique

Publications (1)

Publication Number Publication Date
EP4072811A1 true EP4072811A1 (fr) 2022-10-19

Family

ID=74095790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20829826.5A Pending EP4072811A1 (fr) 2019-12-13 2020-12-11 Recyclage de matière plastique

Country Status (2)

Country Link
EP (1) EP4072811A1 (fr)
WO (1) WO2021116418A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5236655A (en) * 1989-05-12 1993-08-17 Pwr Recycling B.V. Process for processing plastic waste into blocks
US5489200A (en) * 1993-09-30 1996-02-06 The United States Of America As Represented By The Secretary Of The Navy Compress/melt processor for contaminated plastic waste
JP2001047008A (ja) * 1999-08-05 2001-02-20 Daiwa Sokuryo Sekkei Kk 廃物加熱または加圧処理法と装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ293642B6 (cs) * 2002-05-23 2004-06-16 Ptp Plastic Technologies And Products B.V. Způsob zpracování odpadů z polyesteru
EP2682421B1 (fr) * 2012-07-06 2014-09-17 UrbanPlast, SIA Procédé de production de matières plastiques en polyéthylène composite hybride renforcé
PL3445734T3 (pl) * 2016-04-22 2020-04-30 Vossloh Fastening Systems Gmbh Sposób wytwarzania podkładu do stosowania w nawierzchniach torowych
CN106750832A (zh) * 2017-02-28 2017-05-31 江苏三水企业孵化器有限公司 一种增强型埋地用聚乙烯双层波纹管
CN108976596A (zh) * 2018-07-03 2018-12-11 江苏龙灯博士摩包装材料有限公司 高纯化学品装灌用的塑料容器及其制备方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5236655A (en) * 1989-05-12 1993-08-17 Pwr Recycling B.V. Process for processing plastic waste into blocks
US5489200A (en) * 1993-09-30 1996-02-06 The United States Of America As Represented By The Secretary Of The Navy Compress/melt processor for contaminated plastic waste
JP2001047008A (ja) * 1999-08-05 2001-02-20 Daiwa Sokuryo Sekkei Kk 廃物加熱または加圧処理法と装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2021116418A1 *

Also Published As

Publication number Publication date
WO2021116418A1 (fr) 2021-06-17

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