WO2022152514A1 - Procédé d'utilisation physique d'un polyuréthane - Google Patents

Procédé d'utilisation physique d'un polyuréthane Download PDF

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Publication number
WO2022152514A1
WO2022152514A1 PCT/EP2021/086731 EP2021086731W WO2022152514A1 WO 2022152514 A1 WO2022152514 A1 WO 2022152514A1 EP 2021086731 W EP2021086731 W EP 2021086731W WO 2022152514 A1 WO2022152514 A1 WO 2022152514A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyurethane
press
conveyor belt
machine
weight
Prior art date
Application number
PCT/EP2021/086731
Other languages
German (de)
English (en)
Inventor
Delphine Delmas
Original Assignee
Voith Patent Gmbh
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 Voith Patent Gmbh filed Critical Voith Patent Gmbh
Priority to CN202180090326.6A priority Critical patent/CN116745085A/zh
Priority to EP21843623.6A priority patent/EP4277774A1/fr
Priority to JP2023542558A priority patent/JP2024504106A/ja
Publication of WO2022152514A1 publication Critical patent/WO2022152514A1/fr

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
    • B29B17/02—Separating plastics from other materials
    • 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
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/022—Grippers, hooks, piercing needles, fingers, e.g. mounted on robots
    • 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
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0224—Screens, sieves
    • 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
    • B29B2017/0255—Specific separating techniques using different melting or softening temperatures of the materials to be separated
    • 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
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes 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
    • B29L2029/00—Belts or bands
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/32—Wheels, pinions, pulleys, castors or rollers, Rims
    • B29L2031/324—Rollers or cylinders having an axial length of several times the diameter, e.g. embossing, pressing or printing
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7092—Conveyor belts

Definitions

  • the invention relates to a method for material utilization of a polyurethane from a press sleeve or from a press roller or from a conveyor belt, in particular for a machine for the production or treatment of a fibrous web, such as a paper, cardboard or tissue machine, the press sleeve or the press roller or the conveyor belt comprises at least one layer comprising a crosslinked polyurethane, the polyurethane being heated to a temperature greater than 150° C. and thus being melted.
  • Press rolls are used in a large number of presses and, for example, in the form of shoe rolls in shoe presses, which in turn are used in particular for dewatering fibrous webs, such as paper webs.
  • Such shoe presses are constructed from a shoe roll and a backing roll with a press nip formed between them.
  • Shoe rolls consist of a stationary, ie non-rotating, pressing element, namely the shoe, and a flexible press jacket running around the shoe.
  • the shoe is supported by a yoke that carries it and is pressed against the press jacket surrounding it by means of hydraulic pressing elements.
  • An oil film is usually built up between the shoe and the press sleeve for lubrication.
  • press nip Due to the concave design of the shoe on its side opposite the backing roll, there is a comparatively long press nip, which is about 20 times longer than that of conventional presses consisting of two rotating rolls.
  • a fibrous web is guided through the press nip together with one or two press felt(s) and/or another conveyor belt, with the liquid emerging from the fibrous web due to the pressure exerted on the fibrous web in the press nip, which, in addition to water, contains dissolved and undissolved compounds such as fibers, fiber fragments, fillers and/or additives, is temporarily taken up by the press felt and by depressions provided in the press sleeve surface.
  • the of liquid absorbed by the press jacket is thrown off the press jacket before the press jacket re-enters the press nip.
  • the water absorbed by the press felt is removed with suction elements after leaving the press nip. Due to the relatively long press nip due to the concave design of the shoe, much better dewatering of the fibrous web is achieved with such a shoe press compared to a press consisting of two rotating rollers, so that the subsequent thermal drying can be correspondingly shorter. In this way, a particularly gentle and energy-efficient dewatering of the fibrous web is achieved.
  • press sleeves and conveyor belts Due to the high loads from water, fillers and/or additives as well as the mechanical stresses caused by the press impulse and the production speed, press sleeves and conveyor belts have a limited service life. After use, the worn press sleeves or conveyor belts are usually disposed of by either dumping them in a landfill or incinerating them, depending on the region.
  • thermoplastic rubber-polyurethane composite structure is known from publication EP3689935A1, which although it uses the thermoplastic properties of this polyurethane compound, is not suitable for use in press sleeves. This is because such a composite structure is not suitable for the high mechanical and chemical loads on the press sleeves and conveyor belts. In particular, the press sleeves in the shoe press are regularly treated with biocides and chemical cleaning agents, so a rubber content is not possible.
  • the publication DE102013200482A1 describes a method for processing fiber composite components. However, it is not primarily about reusing the matrix material, but about recovering high-quality reinforcing fibers in the matrix material, such as carbon fibers in components in the automotive industry. It is only mentioned that the aqueous phase, which contains the decomposition products of the plastic, can be processed into new chemical raw materials if necessary. Thus, the plastic matrix material, such as polyurethane, should first be broken down into its individual components.
  • the publication WO2016055414A1 describes a mat or a belt for use in track construction for rail vehicles, in road construction or as conveyor belts for the extraction of minerals in quarries, in gravel works or in mine construction.
  • the mats or bands are produced in a scattering process without vulcanization and consist of at least two scattering layers of a thermoplastic elastomer compound in the form of a rubber powder-modified polymerization mixture of rubber powder and a main thermoplastic and at least one fabric layer.
  • press sleeves in particular shoe press sleeves, are nowadays used in machines for producing or treating a fibrous web, such as a paper, cardboard or tissue machine, which comprise a polyurethane whose crosslinker consists partly of amines.
  • a fibrous web such as a paper, cardboard or tissue machine
  • a polyurethane whose crosslinker consists partly of amines.
  • the object of the present invention is to improve the CC balance with regard to used press sleeves, in particular shoe press sleeves, press rolls, in particular their covers or conveyor belts in machines for the production or treatment of a fibrous web.
  • the object is achieved by a generic method as described at the outset, in which the polyurethane comprises an amine crosslinker.
  • the polyurethane although it is provided with amines in the crosslinker, would have sufficient thermoplastic properties to be able to be reused in a sufficiently high quality manner, in particular to make a new press sleeve or a new press roller or press roller cover or to produce a new conveyor belt for a machine for the production or treatment of a fibrous web.
  • the amine component in the crosslinker of the polyurethane to be recycled should not be too large, so that the polyurethane does not lose its thermoplastic properties.
  • the proportion of the amine crosslinking agent is preferably at least 2% by weight and/or at most 15% by weight, more preferably the proportion of the amine crosslinking agent is at least 3% by weight and/or at most 10% by weight and more more preferably, the proportion of the amine crosslinker is at least 4% by weight and/or at most 9% by weight. Such a proportion of amines has led to particularly good results in practice.
  • the percentage by weight is based on the total weight of the crosslinker.
  • the crosslinker serves to crosslink polyols and isocyanates with one another.
  • the polyurethane is typically used as a so-called “cast polyurethane”. This means that the individual components of the polyurethane, such as polyols, isocyanates and crosslinkers, are only brought into contact with one another and only react with one another when the end product is manufactured. However, the same polyurethane can then be used as a so-called "mold polyurethane” during recycling. This means that it can be crushed and melted down again at the appropriate temperature.
  • At least part of the remaining crosslinker preferably all of the remaining crosslinker, consists of the group of short-chain dialcohols, in particular 1,2-ethylene glycol and/or 1,4-butanediol and/or 1,6 -hexanediol.
  • the melting temperature of the polyurethane is between 150°C and 260°C. This can be achieved by a targeted mixture of the amines and short-chain dialcohols, in particular diols of the formula (I).
  • barA stands for "bar absolute”, i.e. without taking the ambient air pressure into account.
  • the press cover or the press roller or the conveyor belt also includes a reinforcement structure, such as a supporting fabric, which is preferably completely surrounded by polyurethane. Thread scrims or knitted fabrics, for example, can also be used as suitable reinforcement structures.
  • One embodiment of the method according to the invention provides that the polyurethane layer, the polyurethane of which is melted down, is free of the reinforcement structure. In other words, only polyurethane in which no reinforcement structure is embedded is recycled. If, for example, the reinforcement structure is only provided in a middle layer of a shoe press jacket, only the polyurethane of the radially inner and/or the radially outer layer can be separated and melted down again. This saves the effort of separating the non-fusible reinforcement structure from the polyurethane immediately surrounding it.
  • non-meltable fractions in particular dirt or parts of a reinforcement structure, such as a supporting fabric, to be removed from the molten polyurethane, in particular by sieving, raking, decanting or skimming.
  • non-meltable parts in particular dirt or parts of a reinforcement structure, such as a supporting fabric, can also be mechanically separated from the polyurethane layer before the melting process, in particular by machining.
  • the polyurethane can be recycled particularly well if the polyurethane is melted in a closed conveying device, in particular in a screw extruder, preferably with the exclusion of oxygen.
  • the conveying device can include a conveying area, a compression area, an area for homogenization, a heating area and/or one or more devices for degassing.
  • the conveying device can be selected in such a way that the working pressure of more than 10 barA and the melting temperature of the thermoplastic polyurethane of more than 150° C. can be achieved.
  • a device for degassing can ensure that oxygen can be removed, in particular by means of a connected vacuum.
  • a bead-like granulate can be created from the molten polyurethane, suitable for use in further process steps, such as in an injection molding and/or extrusion process, for the production of new products, in particular for the production of a press sleeve or a Press roller or a conveyor belt, in particular for a machine for the production or treatment of a fibrous web, such as a paper, cardboard or tissue machine.
  • Another aspect of the present invention relates to a press cover or a press roll or a press roll cover or a conveyor belt, in particular for a machine for the production or treatment of a fibrous web, such as a paper, cardboard or tissue machine, comprising at least one layer comprising a crosslinked polyurethane, wherein the Polyurethane is prepared according to the inventive method for recycling of a polyurethane described above.
  • Figure 1 a schematic view of a shoe press with a press jacket according to an embodiment of the present invention
  • FIG. 2 a schematic view of a method for recycling a press cover according to an exemplary embodiment of the present invention.
  • FIG. 1 shows a schematic cross section of a shoe press 1 which includes a shoe roll 2 and a counter roll 3 .
  • the counter-roller 3 consists of a rotating cylindrically configured roller
  • the Shoe roller 2 composed of a shoe 4, a standing yoke 5 supporting this and a press cover 6.
  • the shoe 4 is supported by the yoke 5 and is pressed against the press jacket 6 running around it via hydraulic press elements (not shown). Due to the concave design of the shoe 4 on its side opposite the counter-roller 3, there is a comparatively long press gap 7.
  • the shoe press 1 is particularly suitable for dewatering fibrous webs 8, such as paper webs.
  • a fibrous web 8 is guided through the press nip 7 with one or two press felts 9, with the liquid emerging from the fibrous web 8 due to the pressure exerted on the fibrous web 8 in the press nip 7, which, in addition to water, contains dissolved and undissolved compounds , such as fibers, fiber fragments, fillers and/or additives, is temporarily received by the press felt(s) 9 and by depressions provided in the press jacket surface, such as grooves or blind bores (not shown).
  • the press felt(s) 9 After leaving the press gap 7, the liquid taken up by the press jacket 6 is thrown off the press jacket 6 before the press jacket 6 enters the press gap 7 again.
  • the water taken up by the press felt 9 is removed with suction elements after leaving the press nip 7 .
  • FIG. 2 shows a device 10 for a method for the recycling of press sleeves 6 .
  • a part of a polyurethane layer 11 is first removed mechanically from the press cover 6, which is then fed into a conveyor device 12. melted and processed into granules.
  • the conveyor device 12 is designed as a screw press 13 .
  • the conveying device 12 has one or more degassing devices 14 , a conveying area 15 , a compression area 16 , a homogenization area 17 , and one or more heating elements 18 which melt part of the polyurethane layer 11 in a heating area 19 .
  • a polyurethane granulate 20 that can be used for recycling 10 can then be produced by cooling and decompression.

Landscapes

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

Abstract

Procédé d'utilisation physique d'un polyuréthane à partir d'un couvercle de presse (6) ou à partir d'un rouleau de presse ou d'une bande transporteuse, en particulier pour une machine de production ou de traitement d'une bande de matière fibreuse, telle qu'une machine à papier, à carton ou à tissu, le couvercle de presse ou le rouleau de presse ou la bande transporteuse comprenant au moins une couche (11) comprenant un polyuréthane réticulé, le polyuréthane étant chauffé à une température supérieure à 100 °C et par conséquent fondu, le polyuréthane comprenant un agent de réticulation aminique. L'invention concerne en outre un couvercle de presse (6) ou un rouleau de presse ou une bande transporteuse, en particulier pour une machine de production ou de traitement d'une bande de matière fibreuse, telle qu'une machine à papier, à carton ou à tissu, comprenant au moins une couche comprenant un polyuréthane réticulé, le polyuréthane ayant été produit par le procédé.
PCT/EP2021/086731 2021-01-13 2021-12-20 Procédé d'utilisation physique d'un polyuréthane WO2022152514A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202180090326.6A CN116745085A (zh) 2021-01-13 2021-12-20 用于聚氨酯的物质利用的方法
EP21843623.6A EP4277774A1 (fr) 2021-01-13 2021-12-20 Procédé d'utilisation physique d'un polyuréthane
JP2023542558A JP2024504106A (ja) 2021-01-13 2021-12-20 ポリウレタンのマテリアルリサイクル方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021100483.7 2021-01-13
DE102021100483.7A DE102021100483A1 (de) 2021-01-13 2021-01-13 Polyurethane Recycling

Publications (1)

Publication Number Publication Date
WO2022152514A1 true WO2022152514A1 (fr) 2022-07-21

Family

ID=79602251

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/086731 WO2022152514A1 (fr) 2021-01-13 2021-12-20 Procédé d'utilisation physique d'un polyuréthane

Country Status (5)

Country Link
EP (1) EP4277774A1 (fr)
JP (1) JP2024504106A (fr)
CN (1) CN116745085A (fr)
DE (1) DE102021100483A1 (fr)
WO (1) WO2022152514A1 (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0607735A1 (fr) 1993-01-18 1994-07-27 Microlite, S.L. Procédé pour la récupération de polyuréthane
WO2009004122A1 (fr) * 2007-07-05 2009-01-08 Tamfelt Pmc Oy Courroie de presse à sabot
EP2374929A1 (fr) * 2010-02-19 2011-10-12 Ichikawa Co.,Ltd. Courroie de procédé de fabrication de papier et son procédé de fabrication
DE102011079894A1 (de) * 2011-07-27 2013-01-31 Voith Patent Gmbh Pressmantel für eine Schuhpresse bzw. Transportband auf Basis von aus MDI-Polycarbonat-Prepolymer gebildetem vernetztem Polyurethan
DE102013200482A1 (de) 2013-01-15 2014-07-17 Siemens Aktiengesellschaft Verfahren zur Wiedergewinnung von Verstärkungsfasern aus faserverstärkten Kunststoffen
WO2016055414A1 (fr) 2014-10-07 2016-04-14 Kölbl Engineering und Consulting GmbH Tapis ou bande
DE102017101562A1 (de) * 2017-01-26 2018-07-26 Forbo Siegling Gmbh Verfahren zur Herstellung und/oder Wiederverwertung eines Förderbandes sowie Förderband
DE102018122782A1 (de) * 2018-09-18 2020-03-19 Voith Patent Gmbh Pressmantel, dessen Verwendung sowie Presswalze und Schuhpresse
EP3640397A1 (fr) * 2012-12-07 2020-04-22 Voith Patent GmbH Enveloppe de pressage pour rouleau presseur
EP3689935A1 (fr) 2019-01-30 2020-08-05 Politechnika Gdanska Composite thermoplastique polyuréthane-caoutchouc et procédé permettant d'obtenir un composite thermoplastique polyuréthane-caoutchouc
EP3744812A1 (fr) 2019-05-27 2020-12-02 Covestro Deutschland AG Procédé d'utilisation de déchets du matériau de type polyuréthane permettant la fabrication de matières premières chimiques pour la fabrication d'isocyanates et de polyuréthanes
EP3808532A1 (fr) 2019-10-15 2021-04-21 LANXESS Corporation Recyclage de polyuréthane moulé

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0607735A1 (fr) 1993-01-18 1994-07-27 Microlite, S.L. Procédé pour la récupération de polyuréthane
WO2009004122A1 (fr) * 2007-07-05 2009-01-08 Tamfelt Pmc Oy Courroie de presse à sabot
EP2374929A1 (fr) * 2010-02-19 2011-10-12 Ichikawa Co.,Ltd. Courroie de procédé de fabrication de papier et son procédé de fabrication
DE102011079894A1 (de) * 2011-07-27 2013-01-31 Voith Patent Gmbh Pressmantel für eine Schuhpresse bzw. Transportband auf Basis von aus MDI-Polycarbonat-Prepolymer gebildetem vernetztem Polyurethan
EP3640397A1 (fr) * 2012-12-07 2020-04-22 Voith Patent GmbH Enveloppe de pressage pour rouleau presseur
DE102013200482A1 (de) 2013-01-15 2014-07-17 Siemens Aktiengesellschaft Verfahren zur Wiedergewinnung von Verstärkungsfasern aus faserverstärkten Kunststoffen
WO2016055414A1 (fr) 2014-10-07 2016-04-14 Kölbl Engineering und Consulting GmbH Tapis ou bande
DE102017101562A1 (de) * 2017-01-26 2018-07-26 Forbo Siegling Gmbh Verfahren zur Herstellung und/oder Wiederverwertung eines Förderbandes sowie Förderband
DE102018122782A1 (de) * 2018-09-18 2020-03-19 Voith Patent Gmbh Pressmantel, dessen Verwendung sowie Presswalze und Schuhpresse
EP3689935A1 (fr) 2019-01-30 2020-08-05 Politechnika Gdanska Composite thermoplastique polyuréthane-caoutchouc et procédé permettant d'obtenir un composite thermoplastique polyuréthane-caoutchouc
EP3744812A1 (fr) 2019-05-27 2020-12-02 Covestro Deutschland AG Procédé d'utilisation de déchets du matériau de type polyuréthane permettant la fabrication de matières premières chimiques pour la fabrication d'isocyanates et de polyuréthanes
EP3808532A1 (fr) 2019-10-15 2021-04-21 LANXESS Corporation Recyclage de polyuréthane moulé

Also Published As

Publication number Publication date
EP4277774A1 (fr) 2023-11-22
CN116745085A (zh) 2023-09-12
JP2024504106A (ja) 2024-01-30
DE102021100483A1 (de) 2022-07-14

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