EP4695465A1 - Bauteil für eine maschine zur herstellung und/oder behandlung einer faserstoffbahn, wie walzenbezug, schaberklinge, pressmantel oder transportband - Google Patents
Bauteil für eine maschine zur herstellung und/oder behandlung einer faserstoffbahn, wie walzenbezug, schaberklinge, pressmantel oder transportbandInfo
- Publication number
- EP4695465A1 EP4695465A1 EP24717160.6A EP24717160A EP4695465A1 EP 4695465 A1 EP4695465 A1 EP 4695465A1 EP 24717160 A EP24717160 A EP 24717160A EP 4695465 A1 EP4695465 A1 EP 4695465A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- groups
- group
- polysiloxane
- structural unit
- 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
Links
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
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/086—Substantially impermeable for transferring fibrous webs
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0233—Soft rolls
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/005—Doctor knifes
Definitions
- Component for a machine for producing and/or treating a fibrous web such as a roll cover, doctor blade, press cover or conveyor belt
- the present invention relates to a component for a machine for producing and/or treating a fibrous web, in particular for a paper, cardboard or tissue machine, wherein the component is a roll cover for a roll, a doctor blade, a press cover for a press roll or a conveyor belt. Furthermore, the present invention relates to a roll, a press roll, in particular a shoe roll of a shoe press, or a conveyor belt which comprises such a component. Furthermore, the present invention relates to a machine for producing and/or treating a fibrous web, in particular a paper, cardboard or tissue machine, which comprises an aforementioned roll, doctor blade, press roll or an aforementioned conveyor belt. Finally, the present invention relates to a method for producing an aforementioned component.
- Rollers, doctor blades, press rollers and conveyor belts are important components of machines for producing and/or treating a fibrous web, such as in particular paper, cardboard and tissue machines.
- rollers and in particular rollers with an elastic surface are used in a large number of process steps in paper production. The latter are used, for example, in sheet formation in the wire section of the paper machine, in dewatering in the press section of the paper machine and in coating, drying and smoothing in the end section of the paper machine.
- the radially outermost surface of such a roller is in almost constant contact with the paper web in some positions in the paper machine.
- Such rollers are therefore exposed to high mechanical loads during operation of the paper machine.
- rollers Apart from that, they must have a low susceptibility to cracking, high impact resistance, have good tear resistance, high tear propagation resistance, high compressive strength and sufficiently high hardness. At the same time, the rollers must be sufficiently abrasion-resistant and wear-resistant in order to have the longest possible service life.
- rollers In order to give the surfaces of rollers the application properties required for their use, rollers are usually provided with a roller cover on their surface arranged on a roller core, the material of which is formulated with regard to the required application properties.
- Press rolls are used in a variety 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 made up of a shoe roll and a counter roll with a press gap formed between them.
- Shoe rolls consist of a stationary, i.e. non-rotating, press element, namely the shoe, and a flexible press sleeve that runs around the shoe.
- the shoe is usually supported by a yoke that carries it and is pressed onto the press sleeve that runs around it by hydraulic press elements.
- An oil film is usually built up between the shoe and the press sleeve for lubrication.
- a comparatively long press gap results, which is around 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 felts, whereby the liquid which escapes from the fibrous web due to the pressure exerted on the fibrous web in the press nip and which contains dissolved and undissolved compounds such as fibers, fiber fragments, fillers and/or additives in addition to water is temporarily absorbed by the press felt and by depressions provided in the press jacket surface.
- a shoe press of this type achieves significantly better dewatering of the fibrous web than a press consisting of two rotating rollers, so that the subsequent thermal drying can be correspondingly shorter. In this way, a particularly gentle dewatering of the fibrous web is achieved.
- a press cover of such a shoe press must ideally meet a variety of requirements in order to achieve optimal results.
- a press cover must be sufficiently flexible to be able to be guided around the shoe.
- the press cover must be sufficiently rigid so that it is not deformed and deformed too much under the pressing load prevailing in the press nip.
- a press cover must have high wear resistance, good abrasion resistance, high resistance to cracking, good resistance to crack growth and high resistance to chemicals, in particular water, oil, acids, bases and solvents.
- a press cover must be characterized by very high hydrophobicity on the paper side.
- conveyor belts are used which must meet at least some of the above requirements and must have a very high level of hydrophobicity, particularly on the paper side.
- such conveyor belts are used in the press section of such machines to transport a fibrous web through the press nip and then to a transfer point where the fibrous web is transferred to the subsequent drying section.
- Such conveyor belts generally comprise at least one of the paper side of the Polymer coating providing the belt, in which a load-bearing textile surface structure is embedded.
- scraper blades are used in the paper and printing industry to clean the surfaces of rotating rollers, which are usually covered with a roller cover.
- scraper blades are used to remove the liquid film on the roller covers, to clean the roller surfaces of contaminants such as paper fibers or coating residues, and to condition the roller surfaces.
- the scraper blades prevent the paper web from wrapping around the roller in the event of a web break and thereby damaging the paper machine.
- the scraper blade rests with a certain pressure on the outer surface of the respective roller or roller cover.
- scraper blades are also used in a corresponding manner to clean and condition rotating belts, belts, screens and felts.
- roll covers for a roll, doctor blades, press covers for a press roll or conveyor belts comprise one or more layers comprising or consisting of a cross-linked polyurethane, a cross-linked polyepoxide or epoxy resin, a cross-linked polyamide or a rubber.
- Each of the layers can also consist of a matrix of one of the aforementioned cross-linked polymers in which a fiber fabric or fiber fabric is embedded.
- the surface of a component that easily becomes dirty during operation is usually made hydrophobic and non-adhesive. This prevents the adhesion of dirt particles and conglomerates to the component surface during operation of the component, or at least ensures that any intermediate adhesion of dirt particles and conglomerates can be easily removed from the component surface, for example by a scraper blade.
- the surface energy of such components is often reduced, often by the covalent incorporation of fluorinated and preferably perfluorinated groups into the polymer from which the component or at least the matrix of the component is made.
- fluorinated and in particular perfluorinated polymers such as in particular per- or polyfluorinated alkyl substances
- a ban on such substances is being discussed in some European countries and in the European Union. This is because these substances are hardly degraded in the natural environment and therefore, due to their extreme longevity, accumulate in the environment, particularly in water and soil. It is therefore desirable to avoid the use of such substances.
- the object of the present invention is therefore to provide a component selected from a roller cover for a roller, a doctor blade, a press cover for a press roller and a conveyor belt for a machine for producing and/or treating a fibrous web, in particular for a paper, cardboard or tissue machine, wherein the component, without containing or having to contain fluorinated or perforated polymers, has a hydrophobic and non-adhesive surface with low surface energy, so that during operation of the component, adhesion of dirt particles and dirt conglomerates to the component surface is avoided or intermediate adhesion of dirt particles and Conglomerates of dirt can be easily removed from the component surface, for example by a scraper blade, whereby the component is nevertheless additionally characterized by high hydrolysis stability, high mechanical stability and high thermomechanical stability, in particular by excellent wear resistance, outstanding abrasion resistance, excellent cracking resistance, outstanding crack growth resistance, high resistance to chemicals and flexibility, rigidity and/or elasticity appropriate for its application.
- this object is achieved by providing a component for a machine for producing and/or treating a fibrous web, in particular for a paper, cardboard or tissue machine, wherein the component is a roll cover for a roll, a doctor blade, a press cover for a press roll or a conveyor belt and comprises at least one layer of a cross-linked polymer, wherein the cross-linked polymer has at least one structural unit selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides and at least one polysiloxane structural unit, wherein the at least one polysiloxane structural unit has the following general formula (I):
- R 1 and R 2 are independently identical or different and are selected from hydrogen, C 1 -C 20 alkyl groups, C 2 -C 20 alkenyl groups, C 2 -C 20 alkynyl groups, C 3 -C 12 cycloalkyl groups and C 5 -C 12 aryl groups and n is an integer of at least 3, in particular at least 5.
- such a component for a machine for producing and/or treating a fibrous web such as in particular for a paper, cardboard or tissue machine, namely a roll cover for a roll, a doctor blade, a press cover for a press roll or a conveyor belt, which consists of a cross-linked polymer or comprises at least one layer of a cross-linked polymer, wherein the cross-linked polymer is a polyepoxide, polyurethane, polyamide or rubber, in particular silicone-free rubber, modified with one or more polysiloxane structural units according to the above general formula (I), is not only characterized by high hydrolysis stability, high mechanical stability and high thermomechanical stability, such as in particular excellent wear resistance, excellent abrasion resistance, excellent crack formation resistance, excellent crack growth resistance, high resistance to chemicals and flexibility, rigidity and/or elasticity appropriate for its application, but such a component also has in particular a hydrophobic and non-adhesive surface with low surface energy
- corresponding components with a surface energy of 40 mN/m or less, in particular 25 mN/m or less and even 15 mN/m or less can be produced without the component containing or having to contain fluorinated or perfluorinated polymers. Due to the cross-linking of the polymer, it is not soluble in water and organic solvents. In addition, by using the aforementioned polysiloxane-modified cross-linked polymer, corresponding components with high homogeneity of properties across the component cross-section can be obtained.
- a cross-linked polymer which has at least one structural unit selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides, and at least one polysiloxane structural unit means in the sense of the present invention that the first-mentioned structural unit selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides is covalently bonded to the at least one polysiloxane structural unit.
- At least one structural unit means that the crosslinked polymer contains one or more structural units selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides, and one or more polysiloxane structural units. If the crosslinked polymer contains two or more structural units selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides, these can each be the same or different from one another. Likewise, the polysiloxane structural units can be the same or different from one another if the crosslinked polymer contains two or more polysiloxane structural units according to the general formula (I).
- roll covering or roll coating refers to both the coating of an uncoated roll and the Coating of a previously coated roller.
- the roller cover can cover the roller completely or partially.
- the component contains a cross-linked polymer which has at least one polysiloxane structural unit according to the general formula (I).
- R 1 and R 2 are independently identical or different and are selected from hydrogen, linear or branched C1-C10-alkyl groups, linear or branched C2-C4-alkenyl groups and Cs-Cw-aryl groups.
- R 1 and R 2 are independently identical or different and are selected from hydrogen, linear or branched Ci-C4 alkyl groups and Cs-Cs aryl groups, more preferably from linear Ci-C4 alkyl groups and very particularly preferably from methyl group and ethyl group. Most preferably, both of R 1 and R 2 are a methyl group.
- Polyalkylsiloxanes, in particular short-chain polyalkylsiloxanes, such as polydimethylsiloxanes are advantageously not only non-toxic in the water phase, but are also characterized by the fact that they do not bioaccumulate. Furthermore, they are characterized by an extraordinarily low surface energy of approx. 10 mN/m.
- n is an integer of at least 3, preferably of at least 5, particularly preferably of at least 10, very particularly preferably from 5 to 50 and most preferably from 5 to 15. This favors the achievement of a low surface energy.
- the present invention is not particularly limited with respect to the position of the at least one polysiloxane structural unit in the crosslinked polymer.
- the main chain of the crosslinked polymer may have at least one Polysiloxane structural unit according to the general formula (I).
- both the main chain of the crosslinked polymer and at least one of the crosslinker bridges of the crosslinked polymer can contain at least one polysiloxane structural unit according to the general formula (I).
- at least one of the crosslinker bridges of the crosslinked polymer contains at least one polysiloxane structural unit according to the general formula (I).
- the crosslinked polymer contains not just one polysiloxane structural unit according to the general formula (I), but a plurality of polysiloxane structural units.
- the plurality of polysiloxane structural units can be the same or different from one another, although in the latter case, preferably all of them fall under the general formula (I).
- the molar proportion of the at least one polysiloxane structural unit according to the general formula (I) based on the crosslinked polymer is 1 to 50 mol%, particularly preferably 5 to 40 mol% and very particularly preferably 10 to 30 mol%.
- the individual polysiloxane structural units according to the general formula (I) are preferably distributed uniformly in the crosslinker bridges of the crosslinked polymer or in the main chain of the crosslinked polymer or in both the main chain and the crosslinker bridges of the crosslinked polymer.
- the crosslinked polymer consists at least almost entirely of structural units selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides, and of polysiloxane structural units according to the general Formula (I).
- the sum of the molar proportions of all structural units selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides and polysiloxane structural units according to the general formula (I), based on the crosslinked polymer, is at least 70 mol%, particularly preferably at least 90 mol%, further preferably at least 95 mol% and very particularly preferably at least 99 mol%.
- the crosslinked polymer consists of one or more structural units selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers and polyamides, and one or more polysiloxane structural units according to the general formula (I), i.e. it contains no other structural units apart from the aforementioned structural units.
- the crosslinked polymer or the component most preferably contains no fluorinated or perfluorinated polymers.
- the cross-linked polymer of the component according to the present invention can contain any type of polyepoxide structural unit. Good results are obtained in particular when the cross-linked polymer contains at least one polyepoxide structural unit of the glycidylamine type or one polyepoxide structural unit of the glycidyl ether type.
- suitable types of polyepoxide structural units of the glycidylamine type are those based on tetraglycidyldiaminodiphenylmethane, triglycidyl-p-aminophenol and triglycidylaminocresol.
- suitable types of polyepoxide structural units of the glycidyl ether type are those based on phenol, bisphenol A, bisphenol F, bisphenol S, phenol novolak, cresol novolak, resorcinol and alkanes.
- polyepoxide structural units of the glycidyl ether type based on bisphenol A such as bisphenol A epichlorohydrin resin
- polyepoxide structural units of the Glycidyl ether type based on alkanes such as, for example, 1,4-bis(2,3-epoxypropoxybutane), 1-(2,3-epoxypropoxy)-2,2-bis((2,3-epoxypropoxy)methyl)butane and/or 1-(2,3-epoxypropoxy)-2-((2,3-epoxypropoxy)methane
- polyepoxide structural units of the glycidylamine type based on tetraglycidyldiaminodiphenylmethane optionally in a mixture with polyepoxide structural units of the glycidyl ether type based on alkanes, such as, for example, 1-(2,3-epoxypropoxy)-2,2-bis
- the molar proportion of all polyepoxide structural units based on the cross-linked polymer is 50 to 99 mol%, particularly preferably 60 to 95 mol% and very particularly preferably 70 to 90 mol%.
- the remainder to 100 mol% corresponds to the polysiloxane structural units, i.e. the cross-linked polymer consists of the polyepoxide structural units and the polysiloxane structural units.
- the main chain of the polymer can consist entirely or at least predominantly of polyepoxide structural units and the cross-linking bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).
- the main chain of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I) and the cross-linking bridges of the polymer can consist entirely or at least predominantly of polyepoxide structural units.
- the main chain of the polymer can consist predominantly of polyepoxide structural units between which polysiloxane structural units according to the general formula (I) are covalently bonded, and the crosslinking bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).
- a main chain or crosslinking bridges consisting predominantly of one type of structural unit means that more than 50 mol%, preferably more than 80 mol-% and particularly preferably more than 90 mol-% of the main chain or crosslinking bridges consist of this type of structural units.
- the crosslinked polymer of the component according to the present invention can contain any type of rubber structural units, wherein at least one type of these structural rubber units can be silicone-free. Good results are obtained in particular when the crosslinked polymer contains at least one - in particular silicone-free - rubber structural unit, wherein the rubber is preferably selected from the group consisting of natural rubbers, synthetic polyisoprenes, epoxidized polyisoprenes, butadiene rubbers, chloroprene rubbers, acrylonitrile-butadiene rubbers, ethylene-propylene-diene rubbers and any combinations of two or more of the aforementioned rubbers. Polyepoxide structural units based on epoxidized polyisoprenes, such as in particular epoxidized natural rubber, are particularly preferred.
- the molar proportion of all rubber structural units based on the crosslinked polymer is preferably 50 to 99 mol%, particularly preferably 60 to 95 mol% and very particularly preferably 70 to 90 mol%.
- the remainder to 100 mol% preferably corresponds to the polysiloxane structural units, i.e. the crosslinked polymer consists of - preferably silicone-free - rubber structural units and the polysiloxane structural units.
- the main chain of the polymer can consist entirely or at least predominantly of rubber structural units and the crosslinker bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).
- the main chain of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I) and the crosslinker bridges of the polymer can consist entirely or at least predominantly of rubber structural units
- the main chain of the polymer can consist predominantly of rubber structural units between which polysiloxane structural units according to the general formula (I) are covalently bonded
- the crosslinking bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).
- a main chain or crosslinking bridges consisting predominantly of one type of structural unit means that more than 50 mol%, preferably more than 80 mol% and particularly preferably more than 90 mol% of the main chain or crosslinking bridges consist of this type of structural unit.
- the crosslinked polymer contains at least one polyamide structural unit, which is preferably a polyamide structural unit according to the following general formula (II):
- R 3 is a Ci-C2o-alkylene group, C2-C2o-alkenylene group, C2-C2o-alkynylene group, C3-Ci2-cycloalkylene group or Cs-Ci2-arylene group,
- R 4 is hydrogen or a Ci-C2o-alkyl group, C2-C2o-alkenyl group, C2-C20-alkynyl group, C3-Ci2-cycloalkyl group or Cs-Ci2-aryl group,
- R 5 is a bond or a Ci-C2o-alkylene group, C2-C2o-alkenylene group, C2-C20-alkynylene group, C3-Ci2-cycloalkylene group or Cs-Ci2-arylene group and m is an integer of at least 5.
- an alkylene group is understood to be a CnH2n hydrocarbon group, i.e. a hydrocarbon group with two terminal radicals.
- R 3 is particularly preferably a C 1 -C 4 alkylene group, C 2 -C 10 alkenylene group or C 8 -C 8 arylene group,
- R 4 is hydrogen or a C 1 -C 10 alkyl group, C 2 -C 10 alkenyl group or C 8 -C 8 aryl group and
- R 5 is a bond or a C 1 -C 10 alkylene group, C 2 -C 10 alkenylene group or C 8 -C 8 arylene group.
- R 3 is very particularly preferably a C 1 -C 4 alkylene group or a C 8 -C 8 arylene group
- R 4 is hydrogen, a C 1 -C 4 alkyl group or a C 8 -C 8 aryl group
- R 5 is a bond or a C 1 -C 4 alkylene group.
- m is an integer of at least 10, particularly preferably of at least 50 and very particularly preferably of at least 100.
- the molar proportion of all polyamide structural units based on the cross-linked polymer is 50 to 99 mol%, particularly preferably 60 to 95 mol% and very particularly preferably 70 to 90 mol%.
- the remainder to 100 mol% corresponds to the polysiloxane structural units, i.e. the cross-linked polymer consists of the polyamide structural units and the polysiloxane structural units.
- the main chain of the polymer can consist entirely or at least predominantly of polyamide structural units and the cross-linking bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).
- the main chain of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I) and the cross-linking bridges of the polymer can consist entirely or at least predominantly of polyamide structural units.
- the main chain of the polymer can consist predominantly of polyamide structural units between which polysiloxane structural units according to the general formula (I) are covalently bonded, and the crosslinking bridges of the polymer can be completely or at least predominantly consist of polysiloxane structural units according to the general formula (I).
- a main chain or crosslinker bridges consisting predominantly of one type of structural unit means that more than 50 mol%, preferably more than 80 mol% and particularly preferably more than 90 mol% of the main chain or crosslinker bridges consist of this type of structural unit.
- the crosslinked polymer contains at least one polyurethane structural unit, which is preferably a polyurethane structural unit according to the following general formula (III):
- R 6 and R 8 are independently identical or different and are selected from Ci-C2o-alkylene groups, C2-C2o-alkenylene groups, C2-C20-alkynylene groups, C3-Ci2-cycloalkylene groups and Cs-Ci2-arylene groups
- R 7 and R 9 are independently identical or different and are selected from hydrogen, Ci-C2o-alkyl groups, C2-C2o-alkenyl groups, C2-C20-alkynyl groups, C3-Ci2-cycloalkyl groups and Cs-Ci2-aryl groups
- R 10 is a bond or a Ci-C2o-alkylene group, C2-C2o-alkenylene group, C2-C2o-alkynylene group, C3-Ci2-cycloalkylene group or Cs-Ci2-arylene group and o is an integer of at least 5.
- R 6 and R 8 are independently identical or different and selected from a Ci-Cw-alkylene group, a C2-C10-alkenylene group or a Cs-Cs-arylene group
- R 7 and R 9 are independently identical or different and selected from hydrogen, a C1-Cw-alkyl group, a C2-C -alkenyl group or a Cs-Cs-aryl group and R 10 is a bond, a Ci-Cio-alkylene group, a C2-C -alkenylene group or a Cs-Cs-arylene group.
- R 6 and R 8 are most preferably independently of one another identical or different and selected from a C1-C4-alkylene group or a Cs-Cs-arylene group
- R 7 and R 9 are most preferably independently of one another identical or different and selected from hydrogen, a C1-C4-alkyl group or a Cs-Cs-aryl group
- R 10 is a bond or a C1-C4-alkylene group.
- o is an integer of at least 10, more preferably of at least 50 and most preferably of at least 100.
- the molar proportion of all polyurethane structural units based on the crosslinked polymer is preferably 50 to 99 mol%, particularly preferably 60 to 95 mol% and very particularly preferably 70 to 90 mol%.
- the remainder to 100 mol% preferably corresponds to the polysiloxane structural units, ie the crosslinked polymer consists of the polyurethane structural units and the polysiloxane structural units.
- the main chain of the polymer can consist entirely or at least predominantly of polyurethane structural units and the crosslinker bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).
- the main chain of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I) and the crosslinker bridges of the polymer can consist entirely or at least predominantly of polyurethane structural units.
- the main chain of the polymer can consist predominantly of polyurethane structural units between which polysiloxane structural units according to the general formula (I) are covalently bonded
- the crosslinking bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).
- a main chain or crosslinking bridges consisting predominantly of one type of structural unit means that more than 50 mol%, preferably more than 80 mol% and particularly preferably more than 90 mol% of the main chain or crosslinking bridges consist of this type of structural units.
- the polymer is cross-linked or insoluble in water and organic solvents.
- the crosslinked polymer - for example with polyepoxide structural units - has a glass transition temperature of 60 to 240°C, particularly preferably from 90 to 200°C and very particularly preferably from 120 to 190°C.
- Such materials can be used, for example, for components that are located in the drying section of a paper machine and are exposed to correspondingly high temperatures there.
- the crosslinked polymer - for example with polyamide structural units - has a glass transition temperature of 45 to 90°C, preferably 60 to 75°C.
- the crosslinked polymer with polyurethane and/or rubber structural units of which at least one type may be silicone-free, has a glass transition temperature of less than 0 °C, preferably less than -20 °C, and most preferably less than -40 °C.
- the cross-linked polymer or the component, directly after cutting has a surface energy of a maximum of 40 mN/m, preferably a maximum of 35 mN/m, particularly preferably a maximum of 30 mN/m, more preferably a maximum of 25 mN/m, even more preferably a maximum of 20 mN/m and most preferably a maximum of 15 mN/m.
- the free surface energy is determined according to of the present invention according to the Owens-Wendt-Rabel-Kaelble method described in the standard DIN EN ISO 19403-2:2020-04, using results of a contact angle measurement on the surface of the coating or component - freshly ground to a specified roughness - with the respective test liquids water and diiodomethane.
- the component consists of a layer which consists of one or more of the cross-linked polymers described above.
- the component can consist of two or more layers, of which at least one or all consist of one or more of the cross-linked polymers described above.
- the component consists of a layer which contains a matrix of one or more of the cross-linked polymers described above, in which one type or several types of fillers and/or fibers of the same or different materials are embedded.
- the fibers can be in the form of fleece, scrim or fabric, for example, or as fibers with lengths of 0.05 mm to 50 mm.
- the component consists of two or more layers, of which at least one matrix contains one or more of the cross-linked polymers described above, in which one or more fillers and/or one or more fibers are embedded.
- the other layers may also contain a matrix of one or more of the crosslinked polymers described above with filler(s) and/or fiber(s) embedded therein, consist of one or more of the crosslinked polymers described above, or be composed of other polymers.
- suitable fillers are spherical inorganic particles, plate- or platelet-shaped inorganic particles, inorganic particles with complex geometries as well as organic/inorganic hybrid materials (for example surface-coated inorganic particles of any geometry), and mixtures of two or more of the aforementioned fillers.
- suitable fibre materials are glass fibres, polyamide fibres, carbon fibres, viscose fibres, flax fibres, hemp fibres and polyester fibres, and mixtures of two or more of the aforementioned materials.
- a further subject matter of the present invention is a roller, a press roller, in particular a shoe roller of a shoe press, or a conveyor belt, which comprises a component described above.
- the present invention relates to a machine for producing and/or treating a fibrous web, in particular a paper, cardboard or tissue machine, which comprises a previously described roller, a previously described doctor blade, a previously described press roller or a previously described conveyor belt.
- a further subject matter of the present invention is a method for producing a previously described component, which comprises producing the component in the form of a roll cover for a roll, a doctor blade, a press cover for a press roll or a conveyor belt from at least one layer of a cross-linked polymer, wherein the cross-linked polymer is produced by reacting i) one or more polymers selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers, polyamides, polyepoxides having at least one functional group, polyurethanes having at least one functional group, rubbers having at least one functional group, in particular silicone-free rubbers and polyamides having at least one functional group with ii) at least one polysiloxane compound comprising at least one structural unit according to the general formula (I) and at least one functional group: -(SiR 1 R 2 O-)n- (I), wherein:
- R 1 and R 2 are independently identical or different and are selected from hydrogen, C 1 -C 20 alkyl groups, C 2 -C 20 alkenyl groups, C 2 -C 20 alkynyl groups, C 3 -C 12 cycloalkyl groups and C 5 -C 12 aryl groups, and n is an integer of at least 3, in particular at least 5, wherein the at least one functional group of the at least one polysiloxane compound ii) is selected such that it reacts with the one or more polymers selected from the group consisting of polyepoxides, polyurethanes, rubbers, in particular silicone-free rubbers, polyamides, polyepoxides having at least one functional group, polyurethanes having at least one functional group, rubbers having at least one functional group and polyamides having at least one functional group.
- This process can advantageously be carried out as a one-step process.
- the process allows the polysiloxane units to be incorporated either into the main chain of the polymer and/or into the crosslinker bridges. Curing can be initiated thermally or photochemically.
- the at least one polysiloxane compound ii) has at least one functional group selected from the group consisting of amine groups, epoxy groups, anhydride groups, hydroxy groups, alkenyl groups, silyl groups with the Si-H structural motif and any combination of two or more of the aforementioned groups.
- the at least one polysiloxane compound ii) can be low molecular weight or high molecular weight and linear, branched, in particular dendritically branched, or cyclic.
- the one or more functional groups in the case of a linear polysiloxane compound ii) can be terminal on one side only, terminal on both sides only, lateral only or both terminal and lateral
- the one or more functional groups in the case of a dendritically branched polysiloxane compound ii) can be terminal on one side only, terminal on multiple sides only, terminal on all sides only, lateral only or both terminal and lateral.
- the one or more functional groups can only be lateral, since there are no end groups.
- a linear polysiloxane according to the following general formula (IV) is used in the process as at least one polysiloxane compound ii):
- R 11 , R 12 , R 13 and R 14 are independently the same or different and are selected from functional groups, hydrogen, Ci-C2o-alkyl groups, C2-C2o-alkenyl groups, C2-C2o-alkynyl groups, C3-Ci2-cycloalkyl groups and C5-C12-aryl groups, and m is an integer from 3 to 20 and preferably from 5 to 15, wherein the number of radicals R 11 , R 12 , R 13 and R 14 which contain a functional group, based on the total number of radicals R 11 , R 12 , R 13 and R 14, is preferably 5 to 95% and preferably 10 to 30%.
- Suitable functional group(s) are in particular amine groups, such as primary or secondary C1-4-alkylamine groups, primary or secondary C2-4-alkenylamine groups, primary or secondary C2-4-alkynylamine groups, C3-4-cycloalkylamine groups and C5-4-arylamine groups, or epoxy groups, such as C2-4-alkylglycidyl ether groups, C4-4-alkenylglycidyl ether groups, C4-4-alkynylglycidyl ether groups, C5-4-cycloalkylglycidyl ether groups and C7-4-arylglycidyl ether groups, or hydroxy groups, such as C1-4-hydroxyalkyl groups, C5-4-hydroxyalkenyl groups, C5-4-hydroxyalkynyl groups, C3-4-hydroxycycloalkyl groups and C5-4-hydroxyaryl groups, or alkenyl groups, such as C1-4-alkylglycidyl ether groups, C4-4-al
- a linear polysiloxane according to the following general formula (V) is used in the process as at least one polysiloxane compound ii):
- R 11 , R 12 , R 13 and R 14 are independently the same or different and are selected from functional groups, hydrogen, C 1 -C 20 alkyl groups, C 2 -C 20 alkenyl groups, C 2 -C 20 alkynyl groups, C 3 -C 12 cycloalkyl groups and C 5 -C 12 aryl groups, and n2 is an integer from 3 to 500 and preferably from 20 to 150, wherein the number of radicals R 11 , R 12 , R 13 and R 14 which are a functional group, based on the total number of radicals R 11 , R 12 , R 13 and R 14 , is preferably 5 to 95% and preferably 10 to 30%.
- the functional group(s) mentioned above can again be considered as functional group(s).
- a dendritically branched polysiloxane containing structural units according to the following general formula (VI) is used in the process as at least one polysiloxane compound ii):
- R 12 and R 13 are independently identical or different and are selected from functional groups, hydrogen, C 1 -C 20 alkyl groups, C 2 -C 20 alkenyl groups, C 2 -C 20 alkynyl groups, C 3 -C 12 cycloalkyl groups and C 5 -C 12 aryl groups, and ns is an integer from 1 to 20 and preferably from 3 to 8, wherein the number of R 12 and R 13 radicals which are a functional group, based on the total number of R 12 and R 13 radicals, is preferably 5 to 95% and preferably 10 to 30%.
- the functional group(s) mentioned above are again suitable as functional group(s).
- a cyclic polysiloxane according to the following general formula (VII) is used in the process as at least one polysiloxane compound ii): wherein: R 12 and R 13 are independently identical or different and are selected from functional groups, hydrogen, C 1 -C 20 alkyl groups, C 2 -C 20 alkenyl groups, C 2 -C 20 alkynyl groups, C 3 -C 12 cycloalkyl groups and C 5 -C 12 aryl groups, and n4 is an integer from 3 to 8 and preferably from 3 to 6, wherein the number of R 12 and R 13 radicals which are a functional group, based on the total number of R 12 and R 13 radicals, is preferably 5 to 95% and preferably 10 to 30%.
- the functional group(s) mentioned above are again suitable as functional group(s).
- Polysiloxane types 1 to 5 are low molecular weight polysiloxanes with a weight average molecular weight of 250 to 4000 g/mol
- polysiloxane types 6 to 10 are high molecular weight polysiloxanes with a weight average molecular weight of 3000 to 250000 g/mol
- polysiloxane types 11 to 15 are dendritically branched polysiloxanes with a weight average molecular weight of 400 to 5000 g/mol
- polysiloxane type 16 is a cyclic polysiloxane with a weight average molecular weight of 250 to 1500 g/mol.
- the functional group(s) is/are either arranged at one end only, as in polymer types 1, 6 and 11, arranged at multiple ends, as in polymer types 2, 7 and 12, arranged only laterally, as in polymer types 3, 8, 13 and 16, or arranged both end- and side-positionally, as in polymer types 4, 5, 9, 10, 14 and 15.
- a compound to the reaction that improves the miscibility of the polymer i) and the polysiloxane compound ii) and/or to mix the reaction mixture before and/or during the reaction, for example by rotation and/or vibration. This is advantageous because in this way a component with homogeneous properties across its cross-section is obtained even if the polymers i) and polysiloxane compounds ii) used are poorly miscible with one another.
- Suitable examples of the compounds which improve the miscibility of polymer i) and polysiloxane compound ii) are in particular alkylsiloxanes, oligoalkylsiloxanes and polyalkylsiloxanes with a high proportion of polar/functional groups (amino, hydroxy, etc.) such as 3-aminopropyltriethoxysilane (APTES) or copolymers of aminopropylmethylsiloxane and dimethylsiloxane, surface-modified inorganic particles such as silica particles with a high proportion of Si-OH groups, and copolymers of, for example, polyepoxide, polyurethane, polyamide or rubber on the one hand and polyalkylsiloxanes on the other hand; these copolymers can be present as statistical copolymers, block copolymers, gradient copolymers or graft copolymers.
- polar/functional groups amino, hydroxy, etc.
- APTES 3-
- Suitable examples of the amine crosslinker iii) which does not contain siloxane groups are diamine compounds comprising alkyl group(s) and/or aryl groups, such as those selected from the group consisting of 4,4'-methylene-bis-(2,6-diethyl-3-chloroaniline), 4,4'-methylene-bis-(2-chloroaniline), 4,4'-methylene-bis-(2-ethylbenzylamine), 4,4'-methylene-bis-(2,6-diethylaniline), 4,4'-methylene-bis-(cyclohexylamine), diethylmethylbenzenediamine, 4,4'-diaminodicyclohexylmethane, 4,4'-diamino-3,3'-dimethyldicyclohexylmethane, 4,4'-diaminodiphenylmethane, 3,5-dimethylthio-tolyldiamine, 3,5-dimethyltolyl-2
- the present invention relates to a component that is obtainable by the method described above.
- polymer i) was used:
- EH1 A mixture of bisphenol A epichlorohydrin resins and 1,4-bis(2,3-epoxypropoxybutane).
- EH2 A mixture of 4,4'-methylenebis[N,N-bis(2,3-epoxypropyl)aniline] and the reaction mass of 1-(2,3-epoxypropoxy)-2,2-bis((2,3-epoxypropoxy)methyl)butane and 1-(2,3-epoxypropoxy)-2-((2,3-epoxypropoxy)methane.
- SA1 A low molecular weight aminopropyl functionalized polydimethylsiloxane compound of type 2 shown in Figure 1. This compound is aminopropyl functionalized at both chain ends so that there are two primary amino groups per polymer chain, so that each molecule can react 4 times in total.
- SA2 A high molecular weight aminopropyl-functionalized polydimethylsiloxane compound of type 7 shown in Figure 1. This compound is aminopropyl-functionalized at both chain ends so that there are two primary amino groups per polymer chain, so that each molecule can react 4 times in total.
- SA3 A low molecular weight aminopropyl-functionalized polydimethylsiloxane compound of type 3 shown in Figure 1. This compound is aminopropyl-functionalized at a few positions. There is one primary and one secondary amino group per functional side chain, so that each functionalized side chain can react 3-fold.
- SA4 A high molecular weight aminopropyl-functionalized polydimethylsiloxane compound of type 8 shown in Figure 1. This compound is aminopropyl-functionalized at many positions. There is one primary amino group per functional side chain, so that each functionalized side chain can react twice.
- A1 Diethylmethylbenzenediamine.
- a reaction mixture was prepared containing EH1 as polymer i) and A1 as hardener, the mixture of polymer i) and hardener being mixed together in such a way that the epoxy and amine NH equivalent weights corresponded to one another.
- solid test specimens were obtained which had a glass transition point of approx. 150 °C (DSC, 2nd run) and a surface energy of 45 mN/m (contact angle measurements on a freshly ground and non-tempered surface with water and diiodomethane, calculated according to Owens-Wendt-Rabel-Kaelble).
- reaction mixtures were provided, each containing EH1 as polymer i).
- a first reaction mixture contained A1 +SA1 +SA4 as polysiloxane-containing hardener mixture
- a second reaction mixture contained A1 +SA2+SA4 as polysiloxane-containing hardener mixture
- a third reaction mixture contained the polysiloxane-containing hardener mixture A1 + SA3 + SA4.
- the mixtures of polymer i) and polysiloxane-containing hardener mixture ii) were each mixed with one another in such a way that the epoxy and amine NH equivalent weights corresponded to one another.
- a reaction mixture was prepared containing polymer i) EH1 and a mixture of A1 and the polysiloxane compound SA4 as hardener, the components of the reaction mixture being mixed together in such a way that the epoxy and amine NH equivalent weights corresponded to one another. 80 to 85% of the NH groups were provided by the hardener A1 and the remaining 15 to 20% of the NH groups were provided by the polysiloxane compound SA4. Hardening at 120 °C gave solid test specimens which had a glass transition point of approx.
- a reaction mixture was prepared containing as polymer i) EH1 and as hardener a mixture of A1 and the polysiloxane compounds ii) SA1 and SA4, the components of the reaction mixture being mixed together such that the epoxy and amine NH equivalent weights corresponded to one another. 80% of the NH groups were provided by the hardener A1 and the remaining 20% of the NH groups were provided in total by the polysiloxane compounds SA1 and SA4 (these two in variable proportions).
- solid test specimens were obtained which had a glass transition point of approx. 110 to 120 °C (DSC, 2nd run) and a surface energy in the range of approx. 20 to 25 mN/m (contact angle measurement on a freshly ground and non-annealed surface with water and diiodomethane, calculated according to Owens-Wendt-Rabel-Kaelble).
- a reaction mixture was prepared containing as polymer i) EH1 and as hardener ii) a mixture of A1 and the polysiloxane compounds SA2 and SA4, whereby the components of the reaction mixture were mixed together so that the epoxy and amine NH equivalent weights corresponded to each other. 80% of the NH groups were provided by the hardener A1 and the remaining 20% of the NH groups were provided in total by the polysiloxane compounds SA2 and SA4 (these two in variable proportions). Solid test specimens were obtained by curing at 120 °C. which had a glass transition point of 125 to 130 °C (DSC, 2nd run) and a surface energy in the range of approx. 19 to 21 mN/m (contact angle measurement on a freshly ground and non-annealed surface with water and diiodomethane, calculated according to Owens-Wendt-Rabel-Kaelble).
- a reaction mixture was prepared containing as polymer i) EH1 and as hardener a mixture of A1 and the polysiloxane compounds SA4 and SA4, the components of the reaction mixture being mixed together such that the epoxy and amine NH equivalent weights corresponded to one another. 80% of the NH groups were provided by the hardener A1 and the remaining 20% of the NH groups were provided in total by the hardener SA3 and the polysiloxane compound SA4 (these two in variable proportions).
- solid test specimens were obtained which had a glass transition point of 120 to 130 °C (DSC, 2nd run) and a surface energy in the range of approx. 25 to 32 mN/m (contact angle measurement on a freshly ground and non-annealed surface with water and diiodomethane, calculated according to Owens-Wendt-Rabel-Kaelble).
- a reaction mixture was provided containing as polymers i) EH1 and EH2 and as hardener a mixture of A1 and SA4, wherein the components the reaction mixture were mixed together so that the epoxy and amine NH equivalent weights corresponded to one another. 80 to 85% of the NH groups were provided by the hardener A1 and the remaining 15 to 20% of the NH groups were provided by the polysiloxane compound SA4. Hardening at 120 °C gave solid test specimens that had a glass transition point of 150 to 170 °C (DSC, 2nd run) and a surface energy in the range of approx. 35 to 38 mN/m (contact angle measurement on a freshly ground and non-tempered surface with water and diiodomethane, calculated according to Owens-Wendt-Rabel-Kaelble).
- a reaction mixture was prepared containing as polymers i) EH1 and EH2 and as hardener a mixture of A1 and the polysiloxane compounds SA1 and SA4, the components of the reaction mixture being mixed together such that the epoxy and amine NH equivalent weights corresponded to one another. 80% of the NH groups were provided by the hardener A1 and the remaining 20% of the NH groups were provided in total by the polysiloxane compounds SA2 and SA4 (these two in variable proportions). By curing at 120 °C, solid test specimens were obtained which had a glass transition point of 128 to 135 °C (DSC, 2nd run) and a surface energy in the range of approx. 31 to 35 mN/m (contact angle measurement on a freshly ground and non-annealed surface with water and diiodomethane, calculated according to Owens-Wendt-Rabel-Kaelble).
- a reaction mixture was prepared containing as polymers i) EH1 and EH2 and as hardener a mixture of A1 and the polysiloxane compounds SA2 and SA4, the components of the reaction mixture being mixed together such that the epoxy and amine NH equivalent weights corresponded to one another. 85% of the NH groups were provided by the hardener A1 and the remaining 15% of the NH groups were provided in total by the polysiloxane compounds SA3 and SA4 (these two in variable proportions).
- solid test specimens were obtained which had a glass transition point of 130 to 145 °C (DSC, 2nd run) and a surface energy in the range of approx. 37 to 40 mN/m (contact angle measurement on a freshly ground and non-annealed surface with water and diiodomethane, calculated according to Owens-Wendt-Rabel-Kaelble).
- a reaction mixture was prepared containing polymers i) EH1 and EH2 and a mixture of A1 and the polysiloxane compounds SA3 and SA4 as hardener, the components of the reaction mixture being mixed together in such a way that the epoxy and amine NH equivalent weights corresponded to one another. 85% of the NH groups were provided by the hardener A1 and the remaining 15% of the NH groups were provided in total by the polysiloxane compounds SA3 and SA4 (these two in variable proportions).
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023109161.1A DE102023109161A1 (de) | 2023-04-12 | 2023-04-12 | Bauteil für eine Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn, wie Walzenbezug, Schaberklinge, Pressmantel oder Transportband |
| PCT/EP2024/059018 WO2024213446A1 (de) | 2023-04-12 | 2024-04-03 | Bauteil für eine maschine zur herstellung und/oder behandlung einer faserstoffbahn, wie walzenbezug, schaberklinge, pressmantel oder transportband |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4695465A1 true EP4695465A1 (de) | 2026-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24717160.6A Pending EP4695465A1 (de) | 2023-04-12 | 2024-04-03 | Bauteil für eine maschine zur herstellung und/oder behandlung einer faserstoffbahn, wie walzenbezug, schaberklinge, pressmantel oder transportband |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4695465A1 (de) |
| CN (1) | CN121241177A (de) |
| DE (1) | DE102023109161A1 (de) |
| WO (1) | WO2024213446A1 (de) |
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| JP2006037328A (ja) | 2004-06-25 | 2006-02-09 | Ichikawa Co Ltd | 製紙機械用ベルト |
| DE102012215613A1 (de) * | 2012-09-04 | 2014-03-06 | Voith Patent Gmbh | Pressband in einer Papiermaschine |
| CN105358764A (zh) * | 2013-07-04 | 2016-02-24 | 福伊特专利有限公司 | 具有低表面能的辊包覆物 |
| FI20216016A1 (en) * | 2021-09-30 | 2023-03-31 | Valmet Technologies Oy | Band |
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| WO2024213446A1 (de) | 2024-10-17 |
| CN121241177A (zh) | 2025-12-30 |
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