EP2118164A2 - Revêtement de cylindre et son procédé de production - Google Patents

Revêtement de cylindre et son procédé de production

Info

Publication number
EP2118164A2
EP2118164A2 EP07875254A EP07875254A EP2118164A2 EP 2118164 A2 EP2118164 A2 EP 2118164A2 EP 07875254 A EP07875254 A EP 07875254A EP 07875254 A EP07875254 A EP 07875254A EP 2118164 A2 EP2118164 A2 EP 2118164A2
Authority
EP
European Patent Office
Prior art keywords
ndi
polyurethane
roll
hardener
weight
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.)
Ceased
Application number
EP07875254A
Other languages
German (de)
English (en)
Inventor
Michael Wokurek
Martin Breineder
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
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
Priority claimed from DE200610060096 external-priority patent/DE102006060096A1/de
Priority claimed from DE200710042819 external-priority patent/DE102007042819A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2118164A2 publication Critical patent/EP2118164A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7678—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing condensed aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes

Definitions

  • the invention relates to a method for producing a roll shell or roll cover of a roll made of an NDI-based polyurethane plastic.
  • the invention also relates to an NDI polyurethane for producing a roll shell or roll cover of a roll formed by mixing an NDI prepolymer with a curing agent.
  • Polyurethane elastomers which are formed by a one- or multistage reaction of NDI (naphthylene-1,5-diisocyanate) with mixtures of polyols, diols and diamines have been known for several decades.
  • NDI naphthylene-1,5-diisocyanate
  • NDI polyurethane elastomers are characterized by high tear and tear propagation resistance, high abrasion resistance, and high elasticity.
  • the object of the invention is therefore to reduce the shrinkage and to improve the green strength, so as to expand the application possibilities of the plastic.
  • this object is achieved in that the curing agent added to the polyurethane prepolymer shortens the pot life to 5 to 60 s.
  • the reaction rate and the increase in viscosity in the course of the crosslinking reaction between the NDI-based preparation and Polymer and the hardener are controlled so that the production of the roll mantle or the roll cover is possible by means of rotational molding.
  • the plastic is applied to a cylindrical, rotatably mounted casting with a movable parallel to the axis of the casting pouring nozzle, wherein the temperature of the applied plastic should be between 90 and 150 0 C.
  • a catalyst which is preferably selected from the group of polyurethane polymerization catalysts.
  • This group includes various organometallic compounds and salts of Zn, Co, Bi, Hg, Cd, K and the like. such as.:
  • the peripheral speed of the casting is between 15 and 80 m / min and the casting nozzle is moved axially at a speed between 5 and 10 mm / revolution.
  • the mixture should be carried out with the hardener in a mixing chamber according to the rotor / stator principle. It is advantageous that rotor and stator are constructed so that the following conditions are met:
  • the gap width distribution between the rotor and the stator resulting from the structural design should be in the range of 1 to 5 mm and should be as narrow as possible in order to achieve as uniform as possible a shear stress on the reaction mixture and thereby prevent clogging of the mixing chamber in areas of low shear rate.
  • the dead volume of the mixing chamber should be as low as possible. Mixing chambers with a dead volume of 5 to 50 ml have proven particularly suitable for mixing a material volume flow of 0.5 to 10 l / min.
  • the resulting short residence times require very effective mixing which is achieved, on the one hand, by high rotor speeds in the range of 1000-5000 rpm and, on the other hand, by flow dividing elements on the rotor and stator which prevent a straight-line flow through the mixing chamber.
  • the hardener consists of 60 to 99% by weight of 1, 4-butanediol, a maximum of 40% by weight of diamine and at most 1% by weight of a catalyst.
  • the hardener contains at least 1% by weight of diamine and / or at least 0.01% by weight of a catalyst.
  • the diamine in the hardener mixture should advantageously be chosen from the following group: - A -
  • the NDI prepolymer is advantageously prepared immediately before the casting process by a chemical reaction of naphthylene-1, 5-diisocyanate with a polyol.
  • the procedure is that the polyol is placed in a reaction vessel and brought to a starting temperature of about 100-150 0 C depending on the type.
  • the prepolymer is gradually degassed by applying a vacuum.
  • the prepolymer thus prepared must be further processed within a period of 0.5-2 hours as described.
  • Polypropylene glycol polytetramethylene glycol
  • polyester polyols polycarbonate polyols
  • polybutadiene polyols polybutadiene polyols
  • polycaprolactone polyols polypropylene glycol, polytetramethylene glycol, polyester polyols, polycarbonate polyols, polybutadiene polyols, polycaprolactone polyols.
  • the recently available finished NDI prepolymers from BAYER such as: Vulkollan 15 S37, can be used.
  • the stoichiometry of the mixture that is the molar ratio between the isocyanate content and the content of reactive hydrogen, should be between 0.80 and 1.20 in order to obtain an optimally balanced material property spectrum.
  • Such a produced roll shell or roll cover is very wear-resistant, heavy-duty and durable and is due to the high demands in particular for use in rolls in machines for producing and / or finishing a paper, cardboard, tissue or another fibrous web.
  • the roll shell according to the invention is used in a soft roll of a calender.
  • the hardness of the NDI polyurethane in the roll cover is preferably between 80 Shore A and 75 Shore D.
  • the loss factor of the NDI polyurethane in the roll cover is preferably between 0.01 and 0.03. Due to the low damping, the roll cover is optimized in relation to the maximum possible load pairing pressure / load frequency.
  • the elastic modulus of the NDI polyurethane in the roll cover is preferably between 100 and 3000 N / mm 2 .
  • a plastics material for forming a roll cover 1 is applied to a rotatably mounted casting body 2 in the form of a cylindrical roll base body by rotational molding. This is done via a suitably formed pouring nozzle 3, which receives the liquid plastic with a temperature between 130 and 140 0 C from a mixing chamber 4.
  • the dynamic mixing chamber 4 operates on the rotor / stator principle.
  • the casting body 2 rotates at a preferably constant peripheral speed, which lies between 15 and 80 m / min.
  • the parallel to the axis of rotation 5 of the casting 2 movable casting nozzle 3 is moved at a speed between 2 and 15, usually between 5 and 10 mm / revolution, so that a uniformly strong relation to the casting 2 is applied.
  • the output of the pouring nozzle 3 is between 500 and 10,000 g / min.
  • the plastic is formed by NDI polyurethane, which is produced by mixing an NDI prepolymer with a hardener in the mixing chamber 4.
  • the hardener should shorten the pot life to values between 8 and 12 s. This accelerated crosslinking allows the application of the rotational casting process.
  • a hardener consisting of 96% by weight of 1, 4-butanediol, 4.95% by weight of p-phenylenediamine and 0.05% by weight of dioctyltin mercaptide.
  • the proportion of diamine determined by its extremely fast reaction rate, the flow behavior of the plastic mixture at the time of exit from the casting nozzle 3 and in the first 2-5 seconds after. This flow behavior is crucial for successful process control. Too low a viscosity, depending on the speed and diameter of the rotating casting body 2, results in rapid draining or spilling off of the used-up material and thus limits the achievable layer thickness. Too high viscosity prevents uniform flow of the plastic, resulting in an undesirable coarse surface texture (ribs) and air pockets.
  • the catalyst subsequently causes a rapid re-drawing of the butanediol isocyanate crosslinking reaction. He is thus responsible for a very rapid passage through the period of the potting material consistency (cheesy state) during which the workpiece is extremely susceptible to the occurrence of fatal stress cracks.
  • the Stöchiomiethe of the mixture is 85% (isocyanate excess).
  • rolls for use in machines for producing and / or finishing a paper, board, tissue or another fibrous web.
  • Such rolls are subjected to a very high load and have lengths of up to 10 m and a diameter of up to 2 m.
  • the process as well as the plastic are also suitable for the production of flexible roll shells. These are usually reinforced by fibers embedded in the plastic, threads or the like and are mainly used in the dewatering or smoothing of the fibrous web.
  • the roll shells are made in an analogous manner by applying the plastic to a cylindrical casting 2, wherein the finished roll shell, however, withdrawn from the casting 2 or the casting 2 is removed from the cast roll shell.
  • Roll covers 1 or roll shells produced in this manner are distinguished by an increase in the permanent load capacity with regard to line load and machine speed and the extension of possible grinding intervals for machining the jacket surface.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

L'invention concerne un procédé de production d'un bandage ou d'un revêtement (1) de cylindre dans une matière plastique polyuréthane à base de NDI. Selon l'invention, pour pallier le plus rapidement possible la faiblesse de résistance à cru afin d'éviter des fendillements par contrainte, le durcisseur ajouté au polyuréthane réduit la durée d'utilisation de 5 à 60 s. L'invention concerne en outre un polyuréthane NDI utilisé pour produire un bandage ou un revêtement (1) de cylindre, formé par mélange d'un prépolymère NDI avec un durcisseur, en particulier pour mettre en oeuvre le procédé selon l'invention, le durcisseur comprenant 60 à 99 % en poids de 1,4-butanediol, au maximum 40 % en poids de diamine et tout au plus 1 % en poids d'un catalyseur.
EP07875254A 2006-12-18 2007-12-18 Revêtement de cylindre et son procédé de production Ceased EP2118164A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200610060096 DE102006060096A1 (de) 2006-12-18 2006-12-18 Walzenbezug und Verfahren zu seiner Herstellung
DE200710042819 DE102007042819A1 (de) 2007-09-07 2007-09-07 Walzenbezug und Verfahren zu seiner Herstellung
PCT/EP2007/064145 WO2009103301A2 (fr) 2006-12-18 2007-12-18 Revêtement de cylindre et son procédé de production

Publications (1)

Publication Number Publication Date
EP2118164A2 true EP2118164A2 (fr) 2009-11-18

Family

ID=40886486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07875254A Ceased EP2118164A2 (fr) 2006-12-18 2007-12-18 Revêtement de cylindre et son procédé de production

Country Status (2)

Country Link
EP (1) EP2118164A2 (fr)
WO (1) WO2009103301A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012201782A1 (de) 2012-02-07 2013-08-08 Voith Patent Gmbh Walzenbezug und Verfahren zu dessen Herstellung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013153141A1 (fr) * 2012-04-11 2013-10-17 Voith Patent Gmbh Rouleau et son procédé de fabrication
CN104334796B (zh) 2012-04-27 2017-06-13 福伊特专利公司 用于制造和/或精制纤维幅材的机器的压榨部的辊

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3220873B2 (ja) * 1992-07-02 2001-10-22 イハラケミカル工業株式会社 ポリウレタンウレアエラストマー
DE10010047A1 (de) * 2000-03-02 2001-09-06 Bayer Ag Polyesterpolyole sowie die Verwendung der Polyesterpolyole zur Herstellung von PUR-Gießelastomeren mit verbesserter Hydrolysebeständigkeit
DE10060473A1 (de) * 2000-12-06 2002-06-13 Bayer Ag Polyurethan-Prepolymer und Polyurethan-Elastomere auf Basis von 1,4-Naphthalindiisocyanat

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009103301A2 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012201782A1 (de) 2012-02-07 2013-08-08 Voith Patent Gmbh Walzenbezug und Verfahren zu dessen Herstellung
WO2013117469A1 (fr) 2012-02-07 2013-08-15 Voith Patent Gmbh Revêtement de rouleau et son procédé de fabrication

Also Published As

Publication number Publication date
WO2009103301A3 (fr) 2010-01-07
WO2009103301A2 (fr) 2009-08-27

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