EP2841647A1 - Press roll with a roll cover consisting of polyurethane - Google Patents

Press roll with a roll cover consisting of polyurethane

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Publication number
EP2841647A1
EP2841647A1 EP13721295.7A EP13721295A EP2841647A1 EP 2841647 A1 EP2841647 A1 EP 2841647A1 EP 13721295 A EP13721295 A EP 13721295A EP 2841647 A1 EP2841647 A1 EP 2841647A1
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EP
European Patent Office
Prior art keywords
roll
diisocyanate
mixture
roller according
additive
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
Application number
EP13721295.7A
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German (de)
French (fr)
Other versions
EP2841647B1 (en
Inventor
Sarah LIPPL
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.)
Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP2841647A1 publication Critical patent/EP2841647A1/en
Application granted granted Critical
Publication of EP2841647B1 publication Critical patent/EP2841647B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D21F3/105—Covers thereof

Definitions

  • the invention relates to a roller, in particular for use in a web-processing and / or finishing machine, such as a paper, board or tissue machine according to the preamble of claim 1.
  • the press rolls or suction press rolls used are often coated with polyurethane.
  • the dewatering capacity of the press or Saugpresszenzenbezugs depends mainly on the surface design of the roll cover. Usually there are patterns of blind holes and grooves which provide an open volume into which the water squeezed out of the fibrous web can escape.
  • suction holes are still available, which pass through the roll shell.
  • suction bores for example, water is sucked out of the fibrous web by means of a suction box arranged in an inner volume of the roller.
  • a press roll according to the prior art is known, for example, from WO201 1/015386, where a combination of a press felt with a press roll cover and / or a suction roll cover for a paper machine is described.
  • the press roll cover is provided with a circumferential groove surface structure, wherein the proportion of an open surface on the entire surface of the press roll cover is in the range of 20% to 50%.
  • a suction press roll is provided which, in addition to the circumferential groove surface structure, is provided with a hole arrangement having a plurality of suction holes completely passing through the suction roll cover, the proportion of an open surface on the whole surface of the suction roll cover is in the range of 30% to 50%.
  • additional hole arrangements in the form of blind holes can be provided for both roll shapes.
  • the shape, size and arrangement of the surface forms is significantly involved in the quality of the final product.
  • a wrong choice of open area can lead to instability of the roll cover as well as to hydraulic or mechanical markings.
  • a disadvantage of the press and Saugpresswalzenbegorin known from the prior art is that they are polluted by prolonged use, whereby the surface forms are added by present in the fiber suspension fillers, fiber agglomerates and resin impurities and not more than open volume for the dewatering of the paper web To be available. As a result, the total drainage decreases. Furthermore, unwanted fluctuations in the moisture profile can occur due to uneven contamination.
  • the functional layer consists of a polymer which is a mixture of at least one prepolymer, at least one curing agent and / or at least one crosslinking agent and at least one additive.
  • the polymer which forms the roll cover therefore, an additive is added, which lowers the surface energy of the roll cover, whereby water and dirt do not adhere to the surface of the roll cover and in the surface shapes, but are transported away quickly. This leads to a higher dewatering efficiency of the press roll and thus also of the paper machine. Variations in the moisture transverse profile can be avoided or at least reduced, which increases the quality of the end product.
  • the additive may be selected from: perfluoropolyether, polytetrafluoroethylene, polyethylene, perfluoropolyether or mixtures thereof.
  • the admixture of the additive is preferably between 1 and 20% by weight. The higher the content of additive, the further the surface energy can be lowered.
  • the prepolymer may be a mixture of a polyol and a diisocyanate.
  • the polyol may be selected from: polyethers, polyesters, polycarbonates, polycaprolactones.
  • the diisocyanate may be an aromatic or an aliphatic diisocyanate or a mixture thereof.
  • the aromatic diisocyanate may be selected from: diphenylmethane diisocyanate, toluene diisocyanate or a mixture thereof.
  • the aliphatic diisocyanate may be hexamethylene diisocyanate.
  • the curing agent and / or the crosslinking agent may be a diamine, a diol or a mixture thereof.
  • the curing agent and / or the crosslinking agent may be selected from 4,4'-methylenebis (3-chloro-2,6-diethylanilines) (MCDEA), 4,4'-methylenebis (2-chloroanilines) (MOCA) , 1, 4 butanediol, 1, 3Propandiol, 1, 2 ethane diol, trimethylolpropane or mixtures thereof.
  • MCDEA 4,4'-methylenebis (3-chloro-2,6-diethylanilines)
  • MOCA 4,4'-methylenebis (2-chloroanilines)
  • press and suction press rolls are known to the person skilled in the art.
  • rolls usually have a roll core of a metal such as steel or of a fiber composite, which is provided with a single or multi-layer roll cover.
  • the latter has an outermost layer, which is also referred to as a functional layer and for which the inventive measures are applicable.
  • the connection between the roll core and the roll cover is usually made by a so-called base layer or primer layer. Between this and the functional layer further intermediate layers may be provided.
  • a fixed suction box may furthermore be present in the interior of the roll around which the roll shell rotates in a known manner.
  • the invention is suitable for use on press and suction press rolls with roller covers, which has a functional layer with common hardness and more common Surface roughness, as they are commonly used in paper, board or tissue machines use.
  • the functional layer of the press or suction press roll can be produced, as known to those skilled in the art, for example by a rotational casting process by applying polymer from a nozzle movable along the longitudinal axis of the roll core or roll shell to be coated with uniform rotation of the roll core or shell. After curing, the desired surface structures such as grooves, blind holes, suction holes or combinations thereof are attached and adjusted by grinding the desired surface roughness of about 0.2 to 7.2 Ra.
  • a polyurethane is used according to the invention, which consists of a mixture of a prepolymer, a curing agent and / or a crosslinking agent with the addition of an additive for modification.
  • the prepolymer is prepared from a polyol such as polyether, polyester, polycarbonate or polycaprolactone and a curing agent such as an aromatic and aliphatic diisocyanate.
  • a polyol such as polyether, polyester, polycarbonate or polycaprolactone
  • a curing agent such as an aromatic and aliphatic diisocyanate.
  • aromatic hardener for example, diphenylmethane diisocyanate or toluene diisocyanate is suitable, while as aliphatic hardener, as e.g. Hexamethylene diisocyanate offers.
  • Suitable chain extenders or crosslinkers are diamines such as 4,4'-methylene-bis (3-chloro-2,6-diethylaniline) (MCDEA) or 4,4'-methylene bis (2-chloroaniline) (MOCA) and short-chain Diols such as 1, 4 butanediol, 1, 2 ethanediol, 1, 3 propanediol or trifunctional products such as trimethylolpropane.
  • diamines such as 4,4'-methylene-bis (3-chloro-2,6-diethylaniline) (MCDEA) or 4,4'-methylene bis (2-chloroaniline) (MOCA)
  • short-chain Diols such as 1, 4 butanediol, 1, 2 ethanediol, 1, 3 propanediol or trifunctional products such as trimethylolpropane.
  • Suitable additives for the modification of the polyurethane are various substance classes in various states of aggregation such as, for example, perfluoropolyethers (trade name eg polysec c, liquid), polytetrafluoroethylene (PTFE, trade name, eg Osixo, powdery), polyethylene (trade name eg Inhance UH-1250, particulate) or bifunctional perfluoropolyether (trade name eg Fluorolink, liquid).
  • perfluoropolyethers trade name eg polysec c, liquid
  • PTFE polytetrafluoroethylene
  • polyethylene trade name eg Inhance UH-1250, particulate
  • bifunctional perfluoropolyether trade name eg Fluorolink, liquid
  • additives 1 to 20% by weight may be added to obtain a modification of the polyurethane in the desired manner. Since the surface energy decreases with increasing additive content, the highest possible additive content is desirable. A limit is set only by the cost of the additive, which are experience very high. In addition to the reduction of the surface energy and the resulting reduced soil and water adhesion, it was surprisingly also possible to observe an improved resistance to hydrolysis and chemical resistance as well as an improvement in the mechanical properties of roll covers designed according to the invention.

Landscapes

  • Paper (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

The invention relates to a roll for a pressing section of a machine for producing and/or refining a fibrous material web such as a paper, board or tissue machine, said roll comprising a roll body or roll shell as well as a roll cover that is arranged on said roll body or roll shell and has at least one functional layer which is suitable for being brought into contact with the fibrous material web or a paper machine clothing. Said functional layer consists of a polymer that is a mixture of at least one prepolymer, one curing agent, one crosslinking agent and one additive.

Description

PRESSWALZE MIT WALZENBEZUG AUS POLYURETHAN  PRESS ROLL WITH POLYURETHANE ROLLER COVER
Die Erfindung betrifft eine Walze insbesondere zur Verwendung in einer bahnverarbeitenden und/oder -veredelnden Maschine wie einer Papier-, Karton- oder Tissuemaschine nach dem Oberbegriff von Anspruch 1 . The invention relates to a roller, in particular for use in a web-processing and / or finishing machine, such as a paper, board or tissue machine according to the preamble of claim 1.
In den o.g. Maschinen werden in der Pressenpartie gewöhnlich Presswalzen oder Saugpresswalzen eingesetzt, welche nach einer Erstentwässerung in der Formierpartie weitere Flüssigkeit aus der Faserstoffbahn insbesondere durch mechanischen Druck und/oder durch Absaugung entziehen. In the o.g. Machines are usually used in the press section press rolls or suction press rolls, which withdraw after a Erstentwässerung in the Formierpartie further liquid from the fibrous web, in particular by mechanical pressure and / or by suction.
Die eingesetzten Presswalzen oder Saugpresswalzen sind häufig mit Polyurethan beschichtet. Die Entwässerungskapazität des Press- oder Saugpresswalzenbezugs hängt dabei hauptsächlich vom Oberflächendesign des Walzenbezugs ab. Gewöhnlich sind Muster aus Blindbohrungen und Rillen vorhanden, welche ein offenes Volumen zur Verfügung stellen, in welches das aus der Faserstoffbahn ausgepresste Wasser ausweichen kann. The press rolls or suction press rolls used are often coated with polyurethane. The dewatering capacity of the press or Saugpresszenzenbezugs depends mainly on the surface design of the roll cover. Usually there are patterns of blind holes and grooves which provide an open volume into which the water squeezed out of the fibrous web can escape.
Im Fall von Saugpresswalzen sind gewöhnlich zusätzlich noch Saugbohrungen vorhanden, welche den Walzenmantel durchgreifen. Durch die Saugbohrungen wird beispielsweise mittels eines in einem Innenvolumen der Walze angeordneten Saugkastens Wasser aus der Faserstoffbahn abgesaugt. In the case of Saugpresswalzen usually suction holes are still available, which pass through the roll shell. By means of the suction bores, for example, water is sucked out of the fibrous web by means of a suction box arranged in an inner volume of the roller.
Eine Presswalze gemäß dem Stand der Technik ist beispielsweise aus der WO201 1/015386 bekannt, wo eine Kombination eines Pressfilzes mit einem Presswalzenbezug und/oder einem Saugwalzenbezug für eine Papiermaschine beschrieben ist. Der Presswalzenbezug ist mit einer Umfangsrillenoberflächenstruktur versehen, wobei der Anteil einer offenen Oberfläche an der Gesamtoberfläche des Presswalzenbezugs im Bereich von 20 % bis 50 % liegt. Weiter ist eine Saugpresswalze beschrieben, die zusätzlich zu der Umfangsrillenoberflächenstruktur mit einer Lochanordnung mit einer Mehrzahl von den Saugwalzenbezug vollständig durchsetzenden Sauglöchern versehen ist, wobei der Anteil einer offenen Oberfläche an der Gesamtoberfläche des Saugwalzenbezugs im Bereich von 30 % bis 50 % liegt. Weiterhin können für beide Walzenformen zusätzliche Lochanordnungen in Form von Blindbohrungen vorgesehen sein. Die Form, Größe und Anordnung der Oberflächenformen ist maßgeblich an der Qualität des Endproduktes beteiligt. Eine falsche Wahl der offenen Fläche kann zu Instabilität des Walzenbezugs sowie zu hydraulischen oder mechanischen Markierungen führen. Nachteilig an den aus dem Stand der Technik bekannten Press- und Saugpresswalzenbezügen ist insbesondere, dass sie durch langen Gebrauch verschmutzen, wodurch die Oberflächenformen durch in der Fasersuspension vorhandene Füllstoffe, Faseragglomerate und Harzverunreinigungen zugesetzt werden und nicht mehr als offenes Volumen für die Entwässerung der Papierbahn zur Verfügung stehen. In der Folge sinkt die Gesamtentwässerung. Weiters können unerwünschte Schwankungen im Feuchtequerprofil durch ungleichmäßige Verschmutzung auftreten. A press roll according to the prior art is known, for example, from WO201 1/015386, where a combination of a press felt with a press roll cover and / or a suction roll cover for a paper machine is described. The press roll cover is provided with a circumferential groove surface structure, wherein the proportion of an open surface on the entire surface of the press roll cover is in the range of 20% to 50%. Further, a suction press roll is provided which, in addition to the circumferential groove surface structure, is provided with a hole arrangement having a plurality of suction holes completely passing through the suction roll cover, the proportion of an open surface on the whole surface of the suction roll cover is in the range of 30% to 50%. Furthermore, additional hole arrangements in the form of blind holes can be provided for both roll shapes. The shape, size and arrangement of the surface forms is significantly involved in the quality of the final product. A wrong choice of open area can lead to instability of the roll cover as well as to hydraulic or mechanical markings. A disadvantage of the press and Saugpresswalzenbezügen known from the prior art is that they are polluted by prolonged use, whereby the surface forms are added by present in the fiber suspension fillers, fiber agglomerates and resin impurities and not more than open volume for the dewatering of the paper web To be available. As a result, the total drainage decreases. Furthermore, unwanted fluctuations in the moisture profile can occur due to uneven contamination.
Mechanische Reinigungsvorrichtungen liefern als Abhilfe nur unzureichende Ergebnisse zur Konditionierung von Walzenbezügen, da beispielsweise durch Schaber und Bürsten die Bohrungen nicht gereinigt werden können, während die Behandlung der Walze mit Waschlösungen zum Eintrag von unerwünschten Stoffen in die Faserstoffbahn und zum Rewetting derselben führen können. Aufgabe der Erfindung ist es somit, die bekannten Press- oder Saugpresswalzenbezüge so weiterzubilden, dass die oben genannten Nachteile vermieden werden können. Mechanical cleaning devices provide as a remedy only insufficient results for the conditioning of roll covers, as for example by scrapers and brushes, the holes can not be cleaned, while the treatment of the roller with wash solutions for the entry of unwanted substances in the fibrous web and Rewetting can lead to the same. The object of the invention is thus to further develop the known press or Saugpresswalzenbezüge so that the above-mentioned disadvantages can be avoided.
Die Aufgabe wird durch die kennzeichnenden Merkmale von Anspruch 1 in Verbindung mit den gattungsbildenden Merkmalen gelöst. Erfindungsgemäß ist dabei vorgesehen, dass die Funktionsschicht aus einem Polymer besteht, welches eine Mischung aus zumindest einem Präpolymer, zumindest einem Härter und/oder zumindest einem Vernetzungsmittel und zumindest einem Additiv ist. Dem Polymer, welches den Walzenbezug bildet, wird also ein Additiv beigemischt wird, welches die Oberflächenenergie des Walzenbezuges senkt, wodurch Wasser und Schmutz nicht an der Oberfläche des Walzenbezugs sowie in den Oberflächenformen haften bleiben, sondern rasch abtransportiert werden. Dies führt zu einer höheren Entwässerungseffizienz der Presswalze und somit auch der Papiermaschine. Schwankungen im Feuchtequerprofil können vermieden oder zumindest reduziert werden, was die Qualität des Endproduktes steigert. The object is achieved by the characterizing features of claim 1 in conjunction with the generic features. According to the invention, it is provided that the functional layer consists of a polymer which is a mixture of at least one prepolymer, at least one curing agent and / or at least one crosslinking agent and at least one additive. The polymer which forms the roll cover, therefore, an additive is added, which lowers the surface energy of the roll cover, whereby water and dirt do not adhere to the surface of the roll cover and in the surface shapes, but are transported away quickly. This leads to a higher dewatering efficiency of the press roll and thus also of the paper machine. Variations in the moisture transverse profile can be avoided or at least reduced, which increases the quality of the end product.
Überraschenderweise wurde festgestellt, dass auch die Hydrolysebeständigkeit, die chemische Beständigkeit und die mechanischen Eigenschaften der erfindungsgemäßen Funktionsschicht durch das beschriebene Polymer signifikant verbessert werden. It has surprisingly been found that the hydrolysis resistance, the chemical resistance and the mechanical properties of the functional layer according to the invention are significantly improved by the polymer described.
Weitere vorteilhafte Ausgestaltungsvarianten und weiterführende Merkmale gehen aus den abhängigen Ansprüchen hervor. Vorzugsweise kann das Additiv ausgewählt sein aus: Perfluoropolyether, Polytetrafluorethylen, Polyethylen, Perfluorpolyether oder Mischungen daraus. Further advantageous embodiment variants and further features will become apparent from the dependent claims. Preferably, the additive may be selected from: perfluoropolyether, polytetrafluoroethylene, polyethylene, perfluoropolyether or mixtures thereof.
Bevorzugt beträgt die Beimengung des Additivs zwischen 1 und 20 Gewichts-%. Je höher der Gehalt an Additiv, desto weiter kann die Oberflächenenergie gesenkt werden. The admixture of the additive is preferably between 1 and 20% by weight. The higher the content of additive, the further the surface energy can be lowered.
Vorteilhafterweise kann das Präpolymer eine Mischung aus einem Polyol und einem Diisocyanat sein. Bevorzugt kann das Polyol ausgewählt sein aus: Polyether, Polyester, Polycarbonate, Polycaprolactone. Das Diisocyanat kann ein aromatisches oder ein aliphatisches Diisocyanat oder eine Mischung daraus sein. Das aromatische Diisocyanat kann ausgewählt sein aus: Diphenylmethandiisocyanat, Toluoldiisocyanat oder eine Mischung daraus. Das aliphatische Diisocyanat kann Hexamethylendiisocyanat sein. Advantageously, the prepolymer may be a mixture of a polyol and a diisocyanate. Preferably, the polyol may be selected from: polyethers, polyesters, polycarbonates, polycaprolactones. The diisocyanate may be an aromatic or an aliphatic diisocyanate or a mixture thereof. The aromatic diisocyanate may be selected from: diphenylmethane diisocyanate, toluene diisocyanate or a mixture thereof. The aliphatic diisocyanate may be hexamethylene diisocyanate.
Gemäß einer weiteren vorteilhaften Weiterbildung der Erfindung kann der Härter und/oder das Vernetzungsmittel ein Diamin, ein Diol oder eine Mischung daraus sein. According to a further advantageous embodiment of the invention, the curing agent and / or the crosslinking agent may be a diamine, a diol or a mixture thereof.
Bevorzugt kann der Härter und/oder das Vernetzungsmittel ausgewählt sein aus 4,4'- Methylene-bis-(3-chloro-2,6-diethylaniline) (MCDEA), 4,4'-Methylenebis(2- chloroaniline) (MOCA), 1 ,4 Butandiol, 1 ,3Propandiol, 1 ,2 Ethandiol, Trimethylolpropan oder Mischungen daraus. Preferably, the curing agent and / or the crosslinking agent may be selected from 4,4'-methylenebis (3-chloro-2,6-diethylanilines) (MCDEA), 4,4'-methylenebis (2-chloroanilines) (MOCA) , 1, 4 butanediol, 1, 3Propandiol, 1, 2 ethane diol, trimethylolpropane or mixtures thereof.
Im Folgenden wird die Erfindung näher erläutert. The invention will be explained in more detail below.
Auf eine ausführliche Beschreibung des Walzenaufbaus kann an dieser Stelle verzichtet werden, da Press- und Saugpresswalzen dem Fachmann bekannt sind. Generell weisen derartige Walzen gewöhnlich einen Walzenkern aus einem Metall wie Stahl oder auch aus einem Faserverbundwerkstoff auf, welcher mit einem ein- oder mehrschichtigen Walzenbezug versehen wird. Letzterer weist eine äußerste Schicht auf, welche auch als Funktionsschicht bezeichnet wird und für welche die erfindungsgemäßen Maßnahmen anwendbar sind. Die Verbindung zwischen dem Walzenkern und dem Walzenbezug wird gewöhnlich durch einen sogenannten Baselayer oder Haftvermittlungsschicht hergestellt. Zwischen diesem und der Funktionsschicht können weitere Zwischenschichten vorgesehen sein. A detailed description of the roll construction can be dispensed with at this point, since press and suction press rolls are known to the person skilled in the art. Generally, such rolls usually have a roll core of a metal such as steel or of a fiber composite, which is provided with a single or multi-layer roll cover. The latter has an outermost layer, which is also referred to as a functional layer and for which the inventive measures are applicable. The connection between the roll core and the roll cover is usually made by a so-called base layer or primer layer. Between this and the functional layer further intermediate layers may be provided.
Handelt es sich um eine besaugte Presswalze, kann weiterhin in bekannter Weise ein feststehender Saugkasten im Inneren der Walze vorhanden sein, um welchen der Walzenmantel rotiert. If it is an evacuated press roll, a fixed suction box may furthermore be present in the interior of the roll around which the roll shell rotates in a known manner.
Die Erfindung ist für die Anwendung auf Press- und Saugpresswalzen mit Walzenbezügen geeignet, die eine Funktionsschicht mit gängiger Härte und gängiger Oberflächenrauigkeit aufweisen, wie sie üblicherweise in Papier-, Karton- oder Tissuemaschinen Verwendung finden. The invention is suitable for use on press and suction press rolls with roller covers, which has a functional layer with common hardness and more common Surface roughness, as they are commonly used in paper, board or tissue machines use.
Die Funktionsschicht der Press- oder Saugpresswalze kann dabei wie dem Fachmann bekannt beispielsweise durch ein Rotationsgussverfahren hergestellt werden, indem Polymer aus einer entlang der Längsachse des zu beschichtenden Walzenkerns oder Walzenmantels verfahrbaren Düse unter gleichmäßiger Rotation des Walzenkerns oder -mantels aufgetragen wird. Nach Aushärtung werden die gewünschten Oberflächenstrukturen wie Rillen, Blindbohrungen, Saugbohrungen oder Kombinationen daraus angebracht sowie durch Schleifen die gewünschte Oberflächenrauhigkeit von ca. 0,2 bis 7,2 Ra eingestellt. The functional layer of the press or suction press roll can be produced, as known to those skilled in the art, for example by a rotational casting process by applying polymer from a nozzle movable along the longitudinal axis of the roll core or roll shell to be coated with uniform rotation of the roll core or shell. After curing, the desired surface structures such as grooves, blind holes, suction holes or combinations thereof are attached and adjusted by grinding the desired surface roughness of about 0.2 to 7.2 Ra.
Als Polymer für die Funktionsschicht des Walzenbezugs wird erfindungsgemäß ein Polyurethan verwendet, welches als Mischung aus einem Präpolymer, einem Härter und/oder einem Vernetzungsmittel unter Beigabe eines Additivs zur Modifikation besteht. As a polymer for the functional layer of the roll cover, a polyurethane is used according to the invention, which consists of a mixture of a prepolymer, a curing agent and / or a crosslinking agent with the addition of an additive for modification.
Das Präpolymer wird dabei aus einem Polyol wie beispielsweise Polyether, Polyester, Polycarbonat oder Polycaprolacton und einem Härter wie einem aromatischen und aliphatischen Diisocyanat hergestellt. Als aromatischer Härter kommt beispielsweise Diphenylmethandiisocyanat oder Toluoldiisocyanat in Frage, während als sich als aliphatischer Härter z.B. Hexamethylendiisocyanat anbietet. The prepolymer is prepared from a polyol such as polyether, polyester, polycarbonate or polycaprolactone and a curing agent such as an aromatic and aliphatic diisocyanate. As the aromatic hardener, for example, diphenylmethane diisocyanate or toluene diisocyanate is suitable, while as aliphatic hardener, as e.g. Hexamethylene diisocyanate offers.
Als Kettenverlängerer bzw. -vernetzer eignen sich Diamine wie 4,4'-Methylene-bis-(3- chloro-2,6-diethylaniline) (MCDEA) oder 4,4'-Methylenebis(2-chloroaniline) (MOCA) sowie kurzkettige Diole wie 1 ,4 Butandiol, 1 ,2 Ethandiol, 1 ,3 Propandiol oder trifunktionelle Produkte wie Trimethylolpropan. Suitable chain extenders or crosslinkers are diamines such as 4,4'-methylene-bis (3-chloro-2,6-diethylaniline) (MCDEA) or 4,4'-methylene bis (2-chloroaniline) (MOCA) and short-chain Diols such as 1, 4 butanediol, 1, 2 ethanediol, 1, 3 propanediol or trifunctional products such as trimethylolpropane.
Als Additive zur Modifikation des Polyurethans eignen sich diverse Stoffklassen in verschiedenen Aggregatzuständen wie beispielsweise Perfluoropolyether (Handelsname z.B. Polysec c, flüssig), Polytetrafluorethylen (PTFE; Handelsname z.B. Osixo, pulverförmig), Polyethylen (Handelsname z.B. Inhance UH-1250, partikelförmig) oder bifunktioneller Perfluorpolyether (Handelsname z.B. Fluorolink, flüssig). Suitable additives for the modification of the polyurethane are various substance classes in various states of aggregation such as, for example, perfluoropolyethers (trade name eg polysec c, liquid), polytetrafluoroethylene (PTFE, trade name, eg Osixo, powdery), polyethylene (trade name eg Inhance UH-1250, particulate) or bifunctional perfluoropolyether (trade name eg Fluorolink, liquid).
Von diesen Additiven können 1 bis 20 Gewichts-% zugegeben werden, um eine Modifizierung des Polyurethans in der gewünschten Weise zu erhalten. Da die Oberflächenenergie mit steigendem Additivgehalt sinkt, ist ein möglichst hoher Additivgehalt wünschenswert. Eine Grenze ist dabei lediglich durch die Kosten des Additivs gesetzt, welche erfahrungsgemäß sehr hoch sind. Neben der Senkung der Oberflächenenergie und der daraus resultierenden reduzierten Schmutz- und Wasseranhaftung konnte überraschenderweise auch eine verbesserte Hydrolysebeständigkeit und chemische Beständigkeit sowie eine Verbesserung der mechanischen Eigenschaften an erfindungsgemäß ausgeführten Walzenbezügen beobachtet werden. Of these additives, 1 to 20% by weight may be added to obtain a modification of the polyurethane in the desired manner. Since the surface energy decreases with increasing additive content, the highest possible additive content is desirable. A limit is set only by the cost of the additive, which are experience very high. In addition to the reduction of the surface energy and the resulting reduced soil and water adhesion, it was surprisingly also possible to observe an improved resistance to hydrolysis and chemical resistance as well as an improvement in the mechanical properties of roll covers designed according to the invention.

Claims

Patentansprüche 1 . Walze für eine Pressenpartie einer Maschine zur Herstellung und/oder Veredelung einer Faserstoffbahn wie einer Papier-, Karton- oder Tissuemaschine, umfassend einen Walzenkörper oder Walzenmantel und einen auf dem Walzenkörper oder Walzenmantel angeordneten Walzenbezug, der zumindest eine Funktionsschicht aufweist, die geeignet ist, mit der Faserstoffbahn oder einer Papiermaschinenbespannung in Kontakt zu treten, dadurch gekennzeichnet, dass die Funktionsschicht aus einem Polymer besteht, welches eine Mischung aus zumindest einem Präpolymer, zumindest einem Härter und/oder zumindest einem Vernetzungsmittel und zumindest einem Additiv ist. Claims 1. Roller for a press section of a machine for producing and / or refining a fibrous web, such as a paper, board or tissue machine, comprising a roll body or roll shell and a roll cover arranged on the roll body or roll shell, which has at least one functional layer which is suitable the fibrous web or a papermachine clothing, characterized in that the functional layer consists of a polymer which is a mixture of at least one prepolymer, at least one curing agent and / or at least one crosslinking agent and at least one additive.
2. Walze nach Anspruch 1 , dadurch gekennzeichnet, dass das Additiv ausgewählt ist aus: Perfluoropolyether, Polytetrafluorethylen, Polyethylen, Perfluorpolyether oder Mischungen daraus. 2. Roller according to claim 1, characterized in that the additive is selected from: perfluoropolyether, polytetrafluoroethylene, polyethylene, perfluoropolyether or mixtures thereof.
3. Walze nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Menge des zugesetzten Additivs 1 bis 20 Gewichts-% beträgt. 3. Roller according to claim 1 or 2, characterized in that the amount of additive added is 1 to 20% by weight.
4. Walze nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Präpolymer eine Mischung aus einem Polyol und einem Diisocyanat ist. 4. Roller according to one of claims 1 to 3, characterized in that the prepolymer is a mixture of a polyol and a diisocyanate.
5. Walze nach Anspruch 4, dadurch gekennzeichnet, dass das Polyol ausgewählt ist aus: Polyether, Polyester, Polycarbonate, Polycaprolactone. 5. Roller according to claim 4, characterized in that the polyol is selected from: polyether, polyester, polycarbonates, polycaprolactones.
6. Walze nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das6. Roller according to claim 4 or 5, characterized in that the
Diisocyanat ein aromatisches oder ein aliphatisches Diisocyanat oder eine Mischung daraus ist. Diisocyanate is an aromatic or an aliphatic diisocyanate or a mixture thereof.
7. Walze nach Anspruch 6, dadurch gekennzeichnet, dass das aromatische Diisocyanat ausgewählt ist aus: Diphenylnnethandiisocyanat, Toluoldiisocyanat oder eine Mischung daraus, und dass das aliphatische Diisocyanat Hexamethylendiisocyanat ist. 7. Roller according to claim 6, characterized in that the aromatic diisocyanate is selected from: Diphenylnnethandiisocyanat, toluene diisocyanate or a mixture thereof, and that the aliphatic diisocyanate is hexamethylene diisocyanate.
8. Walze nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der8. Roller according to one of claims 1 to 7, characterized in that the
Härter und/oder das Vernetzungsmittel ein Diamin, ein Diol oder eine Mischung daraus ist. Hardener and / or the crosslinking agent is a diamine, a diol or a mixture thereof.
9. Walze nach Anspruch 8, dadurch gekennzeichnet, dass der Härter und/oder das Vernetzungsmittel ausgewählt ist aus 4,4'-Methylene-bis-(3-chloro-2,6- diethylaniline) (MCDEA), 4,4'-Methylenebis(2-chloroaniline) (MOCA), 1 ,4 Butandiol, 1 ,3Propandiol, 1 ,2 Ethandiol, Trimethylolpropan oder Mischungen daraus. 9. Roll according to claim 8, characterized in that the curing agent and / or the crosslinking agent is selected from 4,4'-methylene-bis- (3-chloro-2,6-diethylaniline) (MCDEA), 4,4'- Methylenebis (2-chloroaniline) (MOCA), 1, 4 butanediol, 1, 3Propandiol, 1, 2 ethane diol, trimethylolpropane or mixtures thereof.
EP13721295.7A 2012-04-27 2013-04-24 Press roll with a roll cover consisting of polyurethane Active EP2841647B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012207059 2012-04-27
PCT/EP2013/058512 WO2013160358A1 (en) 2012-04-27 2013-04-24 Press roll with a roll cover consisting of polyurethane

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EP2841647A1 true EP2841647A1 (en) 2015-03-04
EP2841647B1 EP2841647B1 (en) 2017-11-15

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EP (1) EP2841647B1 (en)
CN (1) CN104334796B (en)
WO (1) WO2013160358A1 (en)

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Also Published As

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US20150041093A1 (en) 2015-02-12
WO2013160358A1 (en) 2013-10-31
US9267235B2 (en) 2016-02-23
CN104334796A (en) 2015-02-04
CN104334796B (en) 2017-06-13
EP2841647B1 (en) 2017-11-15

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