Component for a machine for producing and / or treating a fibrous material web, such as a roller covering, doctor blade, press jacket, or conveyor belt

Abstract

The invention relates to a component for a machine for producing and / or treating a fibrous material web. The component comprises at least one layer which is made of a crosslinked non-silicon-containing polymer that functions as a polymer matrix and in which at least one polysiloxane structural unit (ii) is covalently bonded to the polymer matrix. The at least one polysiloxane structural unit (ii) has the following general formula (I): -(SiR1R2O-)n, in which: R1 and R2, independently of each other, are the same or different and are selected from hydrogen, C1-C20 alkyl groups, C2-C20 alkenyl groups, C2-C20 alkinyl groups, C3-C12 cycloalkyl groups, and C5- C12 aryl groups and R1 or R2 has at least one functional structural unit that is selected from the group consisting of amine groups, epoxide 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, wherein said functional groups can preferably react with the polymer matrix or the monomers which make up the polymer matrix, and n is a whole number of at least 3. The crosslinked polymer has a surface energy of maximally 40 mN / m.

Description

[0001] Component for a machine for producing and / or treating a fibrous web, such as a roll cover, doctor blade, press cover or conveyor belt

[0002] The present invention relates to a component for a machine for producing and / or treating a fibrous web, in particular for a paper, board, or tissue machine, wherein the component is a roll cover for a roll, a doctor blade, a press sleeve 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 comprising such a component. Furthermore, the present invention relates to a machine for producing and / or treating a fibrous web, in particular a paper, board, 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.

[0003] Rollers, doctor blades, press rollers, and conveyor belts are important components of machines for producing and / or treating fibrous webs, particularly paper, board, and tissue machines. For example, rollers, and in particular rollers with an elastic surface, are used in a variety 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. In such a case, 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.In addition, they must exhibit low crack susceptibility, high impact resistance, good tear resistance, high tear propagation resistance, high compressive strength, and sufficiently high hardness. At the same time, the rollers must be sufficiently abrasion- and wear-resistant to ensure the longest possible service life. To give the roller surfaces the required application properties, rollers are typically coated on their surfaces with a roller cover arranged on a roller core. The material of the cover is formulated with the required application properties in mind.

[0004] Press rolls are used in a wide 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 consist of a shoe roll and a counter roll with a press nip formed between them. Shoe rolls consist of a stationary, i.e. non-rotating, press element, namely the shoe, and a flexible press sleeve that surrounds the shoe. The shoe is usually supported by a yoke and pressed against the press sleeve surrounding it by hydraulic press elements. An oil film is generally built up between the shoe and the press sleeve for lubrication.Due to the concave design of the shoe on the side opposite the counter roll, a comparatively long press nip is created, which is about 20 times longer than that of conventional presses consisting of two rotating rolls. During operation of the shoe press, a fibrous web is guided through the press nip together with one or two press felt(s). The liquid escaping from the fibrous web due to the pressure exerted on the fibrous web in the press nip, which liquid 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 depressions provided in the press sleeve surface. After leaving the press nip, the liquid absorbed by the press sleeve is spun off the press sleeve before the press sleeve re-enters the press nip.In addition, the water absorbed by the press felt is removed with suction elements after leaving the press nip. Because the concave design of the shoe results in a comparatively long press nip, 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 time can be correspondingly shorter. In this way, particularly gentle dewatering of the fibrous web is achieved. A press sleeve for such a shoe press must ideally meet a variety of requirements to achieve optimal results. Firstly, such a press sleeve must be sufficiently flexible to be able to be guided around the shoe. At the same time, the press sleeve must be sufficiently rigid so as not to be excessively deformed and deformed under the pressing load prevailing in the press nip.In addition, a press sleeve must exhibit high wear resistance, good abrasion resistance, high cracking resistance, good crack growth resistance, and high resistance to chemicals, especially water, oil, acids, bases, and solvents. In particular, a press sleeve must be characterized by very high hydrophobicity on the paper side.

[0005] Conveyor belts are used, particularly in paper, board, or tissue machines, which must meet at least some of the aforementioned requirements and, in particular, must exhibit very high hydrophobicity on their paper side. For example, 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 downstream dryer section. Such conveyor belts typically comprise at least one polymer coating providing the paper side of the belt, into which a load-bearing textile fabric is embedded.

[0006] Finally, doctor blades are used in the paper and printing industry to clean the surfaces of rotating rollers, usually covered with roller covers. In paper production, doctor blades are used to remove the liquid film from the roller covers, to clean the roller surfaces of contaminants such as paper fibers or coating residues, and to condition the roller surfaces. Furthermore, the doctor blades prevent the paper web from wrapping around the roller in the event of a web break and thereby damaging the paper machine. To reliably perform these tasks, the doctor blade rests with a specific pressure on the outer surface of the respective roller or roller cover. In addition to cleaning rollers, doctor blades are also used to clean and condition rotating belts, straps, screens, and felts.Due to the high contact pressure with which the scraper blade presses onto the roller surface, which is usually up to 200 N / m or more in contact force related to the length of the scraper blade, high demands are placed on the wear resistance and abrasion resistance of the scraper blades.

[0007] Roll covers, doctor blades, press sleeves, or conveyor belts often 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, into which a fiber fabric or fiber mesh is embedded.

[0008] In order to prevent contamination of the surface of the aforementioned components, namely roller covers for a roller, doctor blades, press sleeves for a press roller, or conveyor belts, by adhering particles and conglomerates during their operation, the surface of a component that is easily contaminated during operation is usually designed to be hydrophobic and non-adhesive. This prevents 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, for example by a doctor blade, can be easily removed from the component surface. For this purpose, the surface energy of such components is frequently reduced, frequently 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.However, the use of materials based on fluorinated and especially perfluorinated polymers, such as per- or polyfluorinated alkyl substances, is controversial, and a ban on such substances is being discussed in some European countries and the European Union. This is because these substances hardly degrade in the natural environment and, due to their extreme persistence, accumulate in the environment, particularly in water bodies and soils. It is therefore desirable to avoid the use of such substances.

[0009] The object of the present invention is therefore to provide a component selected from a roll cover for a roll, a doctor blade, a press cover for a press roll and a conveyor belt for a machine for producing and / or treating a fibrous web, in particular for a paper, board or tissue machine, wherein the component, without containing or comprising fluorinated or perforated polymers,must contain, has a hydrophobic and non-adhesive surface with low surface energy, so that adhesion of dirt particles and dirt conglomerates to the component surface is avoided during operation of the component or intermediate adhesion of dirt particles and dirt conglomerates can be easily removed from the component surface, for example by a scraper blade, wherein the component is nevertheless additionally 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.

[0010] According to the invention, this object is achieved by providing a component for a machine for producing and / or treating a fibrous web, in particular for a paper, board 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):

[0011] -(SiR 1 R 2 O-)n (I), where:

[0012] R 1 and R 2are independently identical or different and are selected from hydrogen, C1-C20-alkyl groups, C2-C20-alkenyl groups, C2-C20-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups and n is an integer of at least 3, in particular at least 5. Surprisingly, it has been found within the scope of the present invention that such a component for a machine for producing and / or treating a fibrous web, such as in particular for a paper, board 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 crosslinked polymer or comprises at least one layer of a crosslinked polymer, wherein the crosslinked 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, so that during operation of the component, adhesion of dirt particles and dirt conglomerates to the component surface is avoided or any intermediate adhesion of dirt particles and dirt conglomerates can be easily removed from the component surface, for example by a scraper blade.

[0013] In particular, 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 in this way, without the component containing or having to contain fluorinated or perfluorinated polymers. Due to the crosslinking of the polymer, it is insoluble in water and organic solvents. Furthermore, the use of the aforementioned polysiloxane-modified crosslinked polymer allows corresponding components with highly homogeneous properties across the component cross-section to be obtained. Further advantages of using the aforementioned polysiloxane-modified crosslinked polymer are that it can be produced using a process that involves a one-step curing and that the crosslinked polymer allows the introduction of abrasive fillers and / or reinforcing fibers.

[0014] A crosslinked 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.

[0015] 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, as well as 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 may each be identical or different from one another. Likewise, the polysiloxane structural units may be identical or different from one another if the crosslinked polymer contains two or more polysiloxane structural units according to the general formula (I).

[0016] According to the present invention, a roll covering or roll coating refers to both the coating of an uncoated roll and the coating of a previously coated roll. The roll covering can cover the roll completely or partially.

[0017] According to the invention, the component contains a crosslinked polymer which has at least one polysiloxane structural unit according to the general formula (I). Good results are obtained in particular when in the 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.

[0018] Particularly preferred in formula (I) are R 1 and R 2are independently identical or different and are selected from hydrogen, linear or branched C1-C4 alkyl groups and C5-C5 aryl groups, more preferably from linear C1-C4 alkyl groups and most preferably from methyl group and ethyl group. Most preferably, both of R 1 and R 2 a methyl group. Polyalkylsiloxanes, especially short-chain polyalkylsiloxanes such as polydimethylsiloxanes, are advantageously not only non-toxic in the aqueous phase but also characterized by their non-bioaccumulation. Furthermore, they are characterized by an exceptionally low surface energy of approximately 10 mN / m.

[0019] In a further development of the inventive concept, it is proposed that in the general formula (I), 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 promotes the achievement of a low surface energy.

[0020] The present invention is not particularly limited with regard to the position of the at least one polysiloxane structural unit in the crosslinked polymer. Thus, the main chain of the crosslinked polymer may contain at least one polysiloxane structural unit according to the general formula (I). Alternatively, it is possible for at least one of the crosslinker bridges of the crosslinked polymer to contain at least one polysiloxane structural unit according to the general formula (I). According to a further alternative, both the main chain of the crosslinked polymer and at least one of the crosslinker bridges of the crosslinked polymer may contain at least one polysiloxane structural unit according to the general formula (I). Particularly preferably, at least one of the crosslinker bridges of the crosslinked polymer contains at least one polysiloxane structural unit according to the general formula (I).

[0021] According to a particularly preferred embodiment of the present invention, 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 may be the same or different from one another, although in the latter case, preferably all of them fall under the general formula (I).

[0022] In particular, it is preferred that the molar fraction 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%. Preferably, the individual polysiloxane structural units according to the general formula (I) are 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.

[0023] Preferably, 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 polysiloxane structural units according to the general formula (I). This means that the sum of the molar fractions 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 most preferably at least 99 mol%.

[0024] Good results are particularly obtained when the crosslinked polymer consists of one or more structural units selected from the group consisting of polyepoxides, polyurethanes, rubbers, especially silicone-free rubbers, and polyamides, as well as one or more polysiloxane structural units according to general formula (I), i.e., it contains no other structural units apart from the aforementioned structural units. In particular, the crosslinked polymer or the component most preferably contains no fluorinated or perfluorinated polymers.

[0025] In principle, the crosslinked 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 crosslinked polymer contains at least one polyepoxide structural unit of the glycidylamine type or one polyepoxide structural unit of the glycidyl ether type. Examples of suitable types of polyepoxide structural units of the glycidylamine type are those based on tetraglycidyldiaminodiphenylmethane, triglycidyl-p-aminophenol and triglycidylaminocresol. Examples of 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. Particular preference is given to polyepoxide structural units of the glycidyl ether type based on bisphenol A, such as bisphenol A epichlorohydrin resin, if appropriate.in a mixture with polyepoxide structural units of the glycidyl ether type based on alkanes, such as 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, or 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 1-(2,3-epoxypropoxy)-2,2-bis((2,3-epoxypropoxy)methyl)butane or 1-(2,3-epoxypropoxy)-2-((2,3-epoxypropoxy)methane.

[0026] In a further development of the inventive concept, it is proposed that the molar proportion of all polyepoxide structural units, based on the crosslinked polymer, be 50 to 99 mol%, particularly preferably 60 to 95 mol%, and very particularly preferably 70 to 90 mol%. Preferably, the remainder to 100 mol% corresponds to the polysiloxane structural units, i.e., the crosslinked 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 crosslinker bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).Alternatively, 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 polyepoxide structural units. According to an alternative embodiment, 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 crosslinker 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 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.

[0027] In addition to one or more polyepoxides, or instead of one or more polyepoxides, the crosslinked polymer of the component according to the present invention can contain any type of rubber structural unit, 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—especially 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.

[0028] The molar proportion of all rubber structural units based on the crosslinked polymer is preferably 50 to 99 mol%, more preferably 60 to 95 mol%, and most 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). Alternatively, 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.According to an alternative embodiment, 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, 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 bridge 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.

[0029] According to a further particularly preferred embodiment of the present invention, the crosslinked polymer contains at least one polyamide structural unit, which is preferably a polyamide structural unit according to the following general formula (II):

[0030] -(R3 -C(O)-NR 4 -R 5 -)m (II), where:

[0031] R 3 a C1-C2o-alkylene group, C2-C2o-alkenylene group, C2-C2o-alkynylene group, C3-C12-cycloalkylene group or C5-C12-arylene group,

[0032] R 4 hydrogen or a C1-C2o-alkyl group, C2-C2o-alkenyl group, C2-C20-alkynyl group, C3-C12-cycloalkyl group or C5-C12-aryl group,

[0033] R 5 a bond or a C1-C20 alkylene group, C2-C20 alkenylene group, C2-C20 alkynylene group, C3-C12 cycloalkylene group or C5-C12 arylene group and m is an integer of at least 5.

[0034] For the purposes of the present invention, an alkylene group is understood to be a CnH2n hydrocarbon group, i.e. a hydrocarbon group with two terminal radicals. Particularly preferred is R 3 a Ci-Cio-alkylene group, C2-Cio-alkenylene group or Cs-Cs-arylene group, R 4Hydrogen or a C1-C1 o-alkyl group, C2-C10-alkenyl group or Cs-Cs-aryl group and R 5 a bond or a C1-C10 alkylene group, C2-C10 alkenylene group or Cs-Cs arylene group. R is most preferably 3 a Ci-C4 alkylene group or a Cs-Cs arylene group, R 4 hydrogen, a Ci-C4 alkyl group or a Cs-Cs aryl group and R 5 a bond or a C1-C4 alkylene group. In all of the aforementioned embodiments, it is preferred that m is an integer of at least 10, more preferably of at least 50, and most preferably of at least 100.

[0035] In a further development of the inventive concept, it is proposed that the molar proportion of all polyamide structural units based on the crosslinked polymer be 50 to 99 mol%, particularly preferably 60 to 95 mol%, and very particularly preferably 70 to 90 mol%. Preferably, the remainder to 100 mol% corresponds to the polysiloxane structural units, i.e., the crosslinked 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 crosslinker bridges of the polymer can consist entirely or at least predominantly of polysiloxane structural units according to the general formula (I).Alternatively, 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 polyamide structural units. According to an alternative embodiment, 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 crosslinker 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 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.

[0036] According to a further particularly preferred embodiment of the present invention, the crosslinked polymer contains at least one polyurethane structural unit, which is preferably a polyurethane structural unit according to the following general formula (III):

[0037] -(R 6 -OC(O)-NR 7 -R 8 -NR 9 -C(O)-OR 1 °-)o (III), wherein:

[0038] R 6 and R 8 are independently identical or different and are selected from C1-C20 alkylene groups, C2-C20 alkenylene groups, C2-C20 alkynylene groups, C3-C12 cycloalkylene groups and C5-C12 arylene groups, R 7 and R 9 are independently identical or different and are selected from hydrogen, C1-C2o-alkyl groups, C2-C2o-alkenyl groups, C2-C20-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups, R 10a bond or a C1-C2o-alkylene group, C2-C2o-alkenylene group, C2-C2o-alkynylene group, C3-C12-cycloalkylene group or C5-C12-arylene group and o is an integer of at least 5.

[0039] Particularly preferred are R 6 and R 8 independently of one another, 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 independently of one another, 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 a bond, a Ci-Cio-alkylene group, a C2-C alkenylene group or a Cs-Cs arylene group. R 6 and R 8 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 9independently of one another, identical or different and selected from hydrogen, a C1-C4 alkyl group or a Cs-Cs aryl group and R 10 a bond or a C1-C4 alkylene group. In all of the aforementioned embodiments, it is preferred that o is an integer of at least 10, more preferably of at least 50, and most preferably of at least 100.

[0040] The molar proportion of all polyurethane structural units based on the crosslinked polymer is preferably 50 to 99 mol%, more preferably 60 to 95 mol%, and most preferably 70 to 90 mol%. The remainder to 100 mol% preferably corresponds to the polysiloxane structural units, i.e. 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). Alternatively, 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.According to an alternative embodiment, 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, 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 bridge 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.

[0041] In order to obtain good mechanical properties and high stability, it is proposed in a further development of the inventive concept that the polymer is cross-linked or insoluble in water and organic solvents.

[0042] Furthermore, it is preferred if the crosslinked polymer—for example, with polyepoxide structural units—has a glass transition temperature of 60 to 240°C, particularly preferably of 90 to 200°C, and most preferably of 120 to 190°C. Such materials can be used, for example, for components located in the drying section of a paper machine, where they are exposed to correspondingly high temperatures.

[0043] Alternatively, it may be advantageous if the crosslinked polymer - for example with polyamide structural units - has a glass transition temperature of 45 to 90°C, preferably of 60 to 75°C.

[0044] Alternatively, it may be advantageous if 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.

[0045] According to a particularly preferred embodiment of the present invention, the crosslinked 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. According to the present invention, the free surface energy is calculated using the Owens-Wendt-Rabel-Kaelble method described in the standard DIN EN ISO 19403-2:2020-04, using the 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.

[0046] According to one embodiment of the present invention, the component consists of a layer consisting of one or more of the cross-linked polymers described above. Alternatively, 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. According to a further alternative, the component consists of a layer containing a matrix consisting of one or more of the cross-linked polymers described above, into which one or more types of fillers and / or fibers of the same or different materials are embedded. The fibers can be in the form of nonwovens, scrims, or woven fabrics, for example, or as fibers with lengths of 0.05 mm to 50 mm.According to a further alternative, the component consists of two or more layers, at least one of which contains a matrix of one or more of the previously described cross-linked polymers, into which one or more fillers and / or one or more fibers are embedded. The other layers can also contain a matrix of one or more of the previously described cross-linked polymers with filler(s) and / or fiber(s) embedded therein, consist of one or more of the previously described cross-linked polymers, or be composed of other polymers.

[0047] Examples of suitable fillers include spherical inorganic particles, plate- or platelet-shaped inorganic particles, inorganic particles with complex geometries, and organic / inorganic hybrid materials (e.g., surface-coated inorganic particles of any geometry), as well as mixtures of two or more of the aforementioned fillers. Examples of suitable fiber materials include glass fibers, polyamide fibers, carbon fibers, viscose fibers, flax fibers, hemp fibers, and polyester fibers, and mixtures of two or more of the aforementioned materials.

[0048] A further subject 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 as described above.

[0049] Furthermore, the present invention relates to a machine for producing and / or treating a fibrous web, in particular a paper, board 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.

[0050] A further subject of the present invention is a process 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), where:

[0051] R 1 and R 2are independently of one another, identical or different and are selected from hydrogen, C1-C20-alkyl groups, C2-C20-alkenyl groups, C2-C20-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-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.

[0052] This process can advantageously be carried out as a one-step process. This process allows the polysiloxane units to be incorporated either into the polymer's main chain and / or into the crosslinker bridges. Curing can be initiated thermally or photochemically.

[0053] To achieve good reactivity, it is proposed, in a further development of the inventive concept, that 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. These functional groups react well with polyepoxides, polyamides, polyurethanes, and rubbers. The reactivity can be further increased if a polyepoxide, polyamide, polyurethane, or rubber modified with at least one functional group is used, wherein the functional groups of the polymer i) are preferably reactive with those of the at least one polysiloxane compound ii).For example, if the at least one polysiloxane compound ii) contains one or more amine groups as functional groups, it is preferred to choose epoxy groups as the functional group of the polyamide, polyurethane or rubber.

[0054] 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. Furthermore, in the case of a linear polysiloxane compound ii), the one or more functional groups can be terminal on one side only, terminal on both sides only, only pendant, or both terminal and pendant, whereas in the case of a dendritically branched polysiloxane compound ii), the one or more functional groups can be terminal on one side only, terminal on multiple sides only, terminal on all sides only, only pendant, or both terminal and pendant. In the case of a cyclic polysiloxane compound ii), the one or more functional groups can only be pendant, since no end groups are present.

[0055] According to a preferred embodiment of the present invention, a linear polysiloxane according to the following general formula (IV) is used in the process as at least one polysiloxane compound ii):

[0056] R 11 -(SiR 12 R 13 O-)mR 14 (IV), where:

[0057] R 11 , R 12 , R 13 and R 14 are independently identical or different and are selected from functional groups, hydrogen, C1-C2o-alkyl groups, C2-C2o-alkenyl groups, C2-C2o-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups, and m is an integer from 3 to 20 and preferably from 5 to 15, wherein preferably the number of radicals R 11 , R 12 , R 13 and R 14 which contain a functional group, based on the total number of residues R 11 , R 12 , R 13 and R 145 to 95% and preferably 10 to 30%. Suitable functional group(s) are, in particular, amine groups, such as primary or secondary C1-10-alkylamine groups, primary or secondary C2-10-alkenylamine groups, primary or secondary C2-C10-alkynylamine groups, C3-C12-cycloalkylamine groups and C5-C12-arylamine groups, or epoxy groups, such as C2-C10-alkylglycidyl ether groups, C4-C10-alkenylglycidyl ether groups, C4-C10-alkynylglycidyl ether groups, C5-C12-cycloalkylglycidyl ether groups and C7-C12-arylglycidyl ether groups, or hydroxy groups, such as C1-C10-hydroxyalkyl groups, C5-C10-hydroxyalkenyl groups, C5-C10-hydroxyalkynyl groups, C3-C12-hydroxycycloalkyl groups and C5-C12-hydroxyaryl groups, or alkenyl groups, such as C1 -C10-alkenyl groups, or silyl groups with the Si-H structural motif, such as dimethylsilyl, diethylsilyl, di-iso-propylsilyl, and diphenylsilyl groups.

[0058] According to another preferred embodiment of the present invention, a linear polysiloxane according to the following general formula (V) is used in the process as at least one polysiloxane compound ii):

[0059] R 11 -(SiR 12 R 13 O-)n2-R 14 (V), where:

[0060] R 11 , R 12 , R 13 and R 14 are independently of one another identical or different and are selected from functional groups, hydrogen, C1-C2o-alkyl groups, C2-C2o-alkenyl groups, C2-C2o-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups, and n2 is an integer from 3 to 500 and preferably from 20 to 150, wherein preferably the number of radicals R 11 , R 12 , R 13 and R 14 , which are a functional group, based on the total number of residues R 11 , R 12 , R 13 and R 145 to 95%, and preferably 10 to 30%. The functional group(s) mentioned above are also suitable.

[0061] According to another preferred embodiment of the present invention, 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):

[0062] -(SiR 12 R 13 O-)n3- (VI), where:

[0063] R 12 and R 13 are independently identical or different and are selected from functional groups, hydrogen, C1-C2o-alkyl groups, C2-C2o-alkenyl groups, C2-C2o-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups, and ns is an integer from 1 to 20 and preferably from 3 to 8, wherein preferably the number of radicals R 12 and R 13, which are a functional group, based on the total number of residues R 12 and R 13 5 to 95%, and preferably 10 to 30%. The functional group(s) mentioned above are also suitable.

[0064] According to another preferred embodiment of the present invention, a cyclic polysiloxane according to the following general formula (VII) is used in the process as at least one polysiloxane compound ii): where: R 12 and R 13 are independently of one another identical or different and are selected from functional groups, hydrogen, C1-C2o-alkyl groups, C2-C2o-alkenyl groups, C2-C2o-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups, and n4 is an integer from 3 to 8 and preferably from 3 to 6, wherein preferably the number of radicals R 12 and R 13, which are a functional group, based on the total number of residues R 12 and R 13 5 to 95%, and preferably 10 to 30%. The functional group(s) mentioned above are also suitable.

[0065] Illustrative examples of corresponding basic types of polysiloxane compounds ii) are shown in Figure 1. The black lines indicate the polysiloxane chain(s) and the light-filled circles indicate the functional groups. Polysiloxane types 1 to 5 are low molecular weight polysiloxanes with a weight-average molecular weight of 250 to 4000 g / mol, whereas 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 and polysiloxane type 16 is a cyclic polysiloxane with a weight-average molecular weight of 250 to 1500 g / mol.As shown in Figure 1, the functional group(s) is / are arranged either only at one end, as in polymer types 1, 6 and 11, multiply at one end, as in polymer types 2, 7 and 12, only laterally, as in polymer types 3, 8, 13 and 16, or both terminally and laterally, as in polymer types 4, 5, 9, 10, 14 and 15.

[0066] In a further development of the inventive concept, it is proposed that in the process one or more polymers selected from polyepoxides and polyepoxides having at least one functional group are reacted with one another with at least one polysiloxane compound ii) which contains one or more amine groups as functional group(s).

[0067] To prevent demixing of the polymer i) and the polysiloxane compound ii) during the process, it may be advantageous to add a compound that improves the miscibility of the polymer i) and the polysiloxane compound ii) to the reaction and / or to mix the reaction mixture before and / or during the reaction, for example by rotation and / or vibration. This is advantageous because it results in a component with homogeneous properties across its cross-section, even if the polymers i) and polysiloxane compounds ii) used are poorly miscible with one another. Suitable examples of compounds that 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, as well as 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.

[0068] Particularly good results are obtained when, in the process, one or more polymers selected from polyepoxides and polyepoxides containing at least one functional group are reacted with at least one polysiloxane compound ii) containing one or more amine groups as functional group(s), and at least one amine crosslinker iii) containing no siloxane groups. The amine crosslinker iii), which contains no siloxane groups, acts as a compound that improves the miscibility of the polymer i) and the polysiloxane compound ii). 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'-dimethyldicyclohexyl-methane, 4,4'-diaminodiphenylmethane, 3,5-dimethylthio-tolyl-diamine, 3,5-dimethyltolyl-2,4-diamine, 3,5-dimethyltolyl-2,6-diamine, Polytetramethylene oxide di-p-aminobenzoate, poly(tetramethylene-3-methyltetramethylene ether) glycol bis-(4-aminobenzoate), trimethylene bis-(4-aminobenzoate), isobutyl-4-chloro-3,5-diaminobenzoate, tetramethylammonium bromide, ethylenediamine, hydrazine, hexamethylenediamine, o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, 1,4-diaminocyclohexane, 1,2-diaminocyclohexane, isophoronediamine, diethyltoluenediamine, 3,5-dimethylthio-2,4-toluenediamine, 3,5-dimethylthio-2,6-toluenediamine and any mixtures of two or more of the aforementioned compounds.

[0069] Finally, the present invention relates to a component that can be obtained by the method described above.

[0070] In the following, the present invention is explained using embodiments which are illustrative of the present invention but do not limit it.

[0071] Examples

[0072] In the following examples, polymer i) was used:

[0073] 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).

[0074] In addition, the following were used as polysiloxane compounds ii):

[0075] 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 two primary amino groups are present per polymer chain, so that each molecule can react 4 times in total.

[0076] 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 two primary amino groups are present per polymer chain, allowing each molecule to react 4 times in total.

[0077] SA3: A low-molecular-weight aminopropyl-functionalized polydimethylsiloxane compound of type 3 shown in Figure 1. This compound is lateral aminopropyl-functionalized at a few positions. Each functional side chain contains a primary and a secondary amino group, allowing each functionalized side chain to react three times. SA4: A high-molecular-weight aminopropyl-functionalized polydimethylsiloxane compound of type 8 shown in Figure 1. This compound is lateral aminopropyl-functionalized at many positions. Each functional side chain contains a primary amino group, allowing each functionalized side chain to react twice.

[0078] Furthermore, the following was used as a conventional polysiloxane-free hardener:

[0079] A1: Diethylmethylbenzenediamine.

[0080] Comparison example 1

[0081] (Epoxy resin without amino-functionalized polysiloxanes)

[0082] A reaction mixture containing EH1 as polymer i) and A1 as hardener was prepared. The mixture of polymer i) and hardener was mixed together such that the epoxy and amine NH equivalent weights corresponded. Curing at 120 °C produced solid specimens with a glass transition point of approximately 150 °C (DSC, 2nd run) and a surface energy of 45 mN / m (contact angle measurements on a freshly ground and unannealed surface with water and diiodomethane, calculated according to the Owens-Wendt-Rabel-Kaelble method).

[0083] Example 1

[0084] (Epoxy resin with a high proportion of amino-functionalized polysiloxanes - combinations SA1 / SA4 or SA2 / SA4 or SA3 / SA4)

[0085] Three reaction mixtures were prepared, each containing EH1 as polymer i). A first reaction mixture contained A1 + SA1 + SA4 as the polysiloxane-containing hardener mixture, a second reaction mixture contained A1 + SA2 + SA4 as the polysiloxane-containing hardener mixture, and a third reaction mixture contained A1 + SA3 + SA4 as the polysiloxane-containing hardener mixture. The mixtures of polymer i) and polysiloxane-containing hardener mixture ii) were each mixed together such that the epoxy and amine NH equivalent weights corresponded.

[0086] Up to 70% of the NH groups were provided by the hardener A1 and the remaining at least 30% of the NH groups were provided by the respective polysiloxane compounds SA1-SA4.

[0087] By curing at 120 °C, solid specimens were obtained which had a glass transition point of approximately 70 to 80 °C (DSC, 2nd run) and surface energies in the range of approximately 13 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).

[0088] Example 2

[0089] (Epoxy resin with a moderate proportion of only one type of amino-functionalized polysiloxanes (SA4))

[0090] A reaction mixture was prepared containing polymer i) EH1 and a mixture of A1 and the polysiloxane compound SA4 as the hardener. The components of the reaction mixture were mixed such that the epoxy and amine NH equivalent weights corresponded. 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. Curing at 120 °C produced solid specimens with a glass transition point of approximately 145 °C (DSC, 2nd run) and a surface energy in the range of 28 to 34 mN / m (contact angle measurement on a freshly ground and unannealed surface with water and diiodomethane, calculated according to the Owens-Wendt-Rabel-Kaelble method). Example 3

[0091] (Epoxy resin with a moderate proportion of amino-functionalized polysiloxanes

[0092] (Combination SA1 / SA4))

[0093] A reaction mixture was prepared containing i) EH1 as polymer and a mixture of A1 and the polysiloxane compounds ii) SA1 and SA4 as hardener. The components of the reaction mixture were mixed together such that the epoxy and amine NH equivalent weights corresponded. 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 (both in variable proportions). By curing at 120 °C, solid specimens were obtained which had a glass transition point of approximately 110 to 120 °C (DSC, 2nd run) and a surface energy in the range of approximately 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).

[0094] Example 4

[0095] (Epoxy resin with a moderate proportion of amino-functionalized polysiloxanes (combination SA2 / SA4))

[0096] A reaction mixture was prepared containing i) EH1 as polymer and ii) a mixture of A1 and the polysiloxane compounds SA2 and SA4 as hardener. The components of the reaction mixture were mixed such that the epoxy and amine NH equivalent weights corresponded. 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 (both in variable proportions). By curing at 120 °C, solid specimens were obtained which had a glass transition point of 125 to 130 °C (DSC, 2nd run) and a surface energy in the range of approximately 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).

[0097] Example 5

[0098] (Epoxy resin with a moderate proportion of amino-functionalized polysiloxanes (combination SA3 / SA4))

[0099] A reaction mixture was prepared containing polymer i) EH1 and a mixture of A1 and the polysiloxane compounds SA4 and SA4 as the hardener. The components of the reaction mixture were mixed together such that the epoxy and amine NH equivalent weights corresponded. 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 (both in variable proportions). By curing at 120 °C, solid 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 approximately 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).

[0100] Example 6

[0101] (Epoxy resin with increased degree of crosslinking and a moderate proportion of only one type of amino-functionalized polysiloxanes (SA4))

[0102] A reaction mixture was prepared containing i) EH1 and EH2 as polymers and a mixture of A1 and SA4 as hardener. The components of the reaction mixture were mixed such that the epoxy and amine NH equivalent weights corresponded. 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. Curing at 120 °C produced solid specimens with a glass transition point of 150 to 170 °C (DSC, 2nd run) and a surface energy in the range of approximately 35 to 38 mN / m (contact angle measurement on a freshly ground and unannealed surface with water and diiodomethane, calculated according to the Owens-Wendt-Rabel-Kaelble method).

[0103] Example 7

[0104] (Epoxy resin with increased degree of cross-linking and a moderate proportion of amino-functionalized polysiloxanes (combination SA1 / SA4))

[0105] A reaction mixture was prepared containing i) EH1 and EH2 as polymers and a mixture of A1 and the polysiloxane compounds SA1 and SA4 as hardener. The components of the reaction mixture were mixed together such that the epoxy and amine NH equivalent weights corresponded. 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 (both in variable proportions). By curing at 120 °C, solid 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 approximately 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).

[0106] Example 8 (epoxy resin with increased degree of cross-linking and a moderate

[0107] Proportion of amino-functionalized polysiloxanes (combination SA2 / SA4))

[0108] A reaction mixture was prepared containing polymers i) EH1 and EH2, and a mixture of A1 and the polysiloxane compounds SA2 and SA4 as the hardener. The components of the reaction mixture were mixed together such that the epoxy and amine NH equivalent weights corresponded. 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 (both in variable proportions). By curing at 120 °C, solid 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 approximately 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).

[0109] Example 9

[0110] (Epoxy resin with increased degree of cross-linking and a moderate proportion of amino-functionalized polysiloxanes (combination SA3 / SA4))

[0111] A reaction mixture was prepared containing polymers i) EH1 and EH2 and a mixture of A1 and the polysiloxane compounds SA3 and SA4 as the hardener. The components of the reaction mixture were mixed together such that the epoxy and amine NH equivalent weights corresponded. 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 (both in variable proportions). By curing at 120 °C, solid specimens were obtained which had a glass transition point of 145 to 150 °C (DSC, 2nd run) and a surface energy in the range of approximately 34 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).

[0112] Example 10

[0113] (Reduction of the surface energy of epoxy resins with increased degree of cross-linking and a moderate proportion of amino-functionalized polysiloxanes (combinations SA1 / SA4 or SA2 / SA4 or SA3 / SA4) by tempering)

[0114] In the comparative example and in Examples 1 to 9, the contact angles with water and diiodomethane were measured exclusively on freshly ground surfaces, so that the surface energies calculated from them represented the value of a freshly prepared surface. Representative samples from Examples 7, 8, and 9 were therefore stored at 120 °C for 12 hours between the preparation of the sample surface by grinding and the measurement of the contact angles with water and diiodomethane. While the samples previously exhibited surface energies of approximately 30 to 40 mN / m (as described in Examples 7, 8, and 9), surface energies in the range of approximately 8 to 13 mN / m were measured after this annealing step.

Claims

Patent claims 1 . A component for a machine for producing and / or treating a fibrous web, in particular for a paper, board, 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 crosslinked non-silicone-containing polymer acting as a polymer matrix, and at least one polysiloxane structural unit ii) covalently bonded to the polymer matrix, wherein the at least one polysiloxane structural unit ii) has the following general formula (I): -(SiR 1 R 2 O-) n (I), wherein: R 1 and R 2 are independently identical or different and are selected from hydrogen, C1-C20-alkyl groups, C2-C20-alkenyl groups, C2-C20-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups and R 1 or R2 have at least one functional structural unit selected from the group consisting of amine groups, epoxide 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, wherein these functional groups can preferably react with the polymer matrix or the monomers from which the polymer matrix is ​​constructed and n is an integer of at least 3, and wherein the crosslinked polymer has a surface energy of at most 40 mN / m, preferably at most 35 mN / m, particularly preferably at most 30 mN / m, further preferably at most 25 mN / m, even more preferably at most 20 mN / m and most preferably at most 15 mN / m immediately after cutting.

2. Component according to claim 1, characterized in that in formula (I) R 1 and R 2are independently identical or different and are selected from hydrogen, linear or branched C1-C10 alkyl groups, linear or branched C2-C4 alkenyl groups and C6-C10 aryl groups and furthermore R 1 or R 2 have at least one functional structural unit 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, wherein these functional groups can preferably react with the polymer matrix or the monomers from which the polymer matrix is ​​constructed.

3. Component according to claim 1 or 2, characterized in that in formula (I) R 1 and R 2are independently identical or different and are selected from hydrogen, linear or branched C1-C4 alkyl groups and Ce-Cs aryl groups, preferably from linear C1-C4 alkyl groups and particularly preferably from methyl group and ethyl group, where R 1 and R 2 most preferably both methyl groups are R 1 or R 2 have at least one functional structural unit selected from the group consisting of amine groups, epoxide 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, whereby these functional groups can preferentially react with the polymer matrix or the monomers from which the polymer matrix is ​​constructed.

4. Component according to at least one of the preceding claims, characterized in that 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.

5. Component according to at least one of the preceding claims, characterized in that at least one polysiloxane structural unit according to the general formula (I) is contained in the main chain of the crosslinked polymer.

6. Component according to at least one of the preceding claims, characterized in that at least one polysiloxane structural unit according to the general formula (I) is contained in at least one of the crosslinking bridges of the crosslinked polymer.

7. Component according to at least one of the preceding claims, characterized in that at least one polysiloxane structural unit according to the general formula (I) is contained in the main chain of the crosslinked polymer and at least one polysiloxane structural unit according to the general formula (I) is contained in at least one of the crosslinker bridges of the crosslinked polymer.

8. Component according to at least one of the preceding claims, characterized in that 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%, preferably 5 to 40 mol% and particularly preferably 10 to 30 mol%.

9. Component according to at least one of the preceding claims, characterized in that the crosslinked polymer consists of one or more structural units selected from the group consisting of polyepoxides, polyamides, polyurethanes and rubbers, in particular silicone-free rubbers, and one or more polysiloxane structural units according to the general formula (I).

10. Component according to at least one of the preceding claims, characterized in that the crosslinked polymer contains at least one polyepoxide structural unit, which is preferably a polyepoxide structural unit of the glycidylamine type or a polyepoxide structural unit of the glycidyl ether type.

11. Component according to at least one of the preceding claims, characterized in that 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.

12. Component according to at least one of the preceding claims, characterized in that 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 -C(O)-NR 4 -R 5 -) m (II), wherein: R 3a C1-C2o-alkylene group, C2-C2o-alkenylene group, C2-C20-alkynylene group, C3-C12-cycloalkylene group or C5-C12-arylene group, R 4 hydrogen or a C1-C2o-alkyl group, C2-C2o-alkenyl group, C2-C2o-alkynyl group, C3-C12-cycloalkyl group or C5-C12-aryl group, R 5 a bond or a C1-C2o-alkylene group, C2-C2o-alkenylene group, C2-C2o-alkynylene group, C3-C12-cycloalkylene group or C5-C12-arylene group and m is an integer of at least 5.

13. Component according to at least one of the preceding claims, characterized in that 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 -OC(O)-NR 7 -R 8 -NR 9 -C(O)-OR 1 °-)o (III), wherein: R 6 and R 8are independently identical or different and are selected from C1-C2o-alkylene groups, C2-C2o-alkenylene groups, C2-C2o-alkynylene groups, C3-C12-cycloalkylene groups and C5-C12-arylene groups, R 7 and R 9 are independently identical or different and are selected from hydrogen, C1-C20 alkyl groups, C2-C20 alkenyl groups, C2-C20 alkynyl groups, C3-C12 cycloalkyl groups and C5-C12 aryl groups, R 10 a bond or a C1-C2o-alkylene group, C2-C2o-alkenylene group, C2-C2o-alkynylene group, C3-C12-cycloalkylene group or C5-C12-arylene group and o is an integer of at least 5.

14. Component according to at least one of the preceding claims, characterized in that the polymer is cross-linked and insoluble in water and organic solvents.

15. Component according to at least one of the preceding claims, characterized in that at least one layer of the component contains a matrix of the crosslinked polymer, into which one or more types of fillers and / or fibers of the same or different materials are embedded. The fibers can be in the form of nonwovens, scrims, or woven fabrics, for example, or as fibers with lengths of 0.05 mm to 50 mm.

16. Roller, press roller or conveyor belt, which comprises a component according to at least one of the preceding claims.

17. Machine for producing and / or treating a fibrous web, in particular a paper, board or tissue machine, which comprises a roller, a doctor blade, a press roller or a conveyor belt according to claim 17.

18. A method for producing a component according to at least one of the preceding claims, comprising 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), where: R 1 and R 2are independently of one another, identical or different and are selected from hydrogen, C1-C20-alkyl groups, C2-C20-alkenyl groups, C2-C20-alkynyl groups, C3-C12-cycloalkyl groups and C5-C12-aryl groups, and n is an integer of at least 3, wherein the at least one functional group of the at least one compound (i) 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, in particular silicone-free rubbers and polyamides having at least one functional group.

19. The method according to claim 18, characterized in that 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 combinations of two or more of the aforementioned groups.

20. The method according to claim 18 or 19, characterized in that the at least one polysiloxane compound ii) is a linear polysiloxane according to the following general formula (IV): R 11 -(SiR 12 R 13 O-)mR 14 (IV), where: R 11 , R 12 , R 13 and R 14are independently of one another identical or different and are selected from functional groups, hydrogen, C1-C20 alkyl groups, C2-C20 alkenyl groups, C2-C20 alkynyl groups, C3-C12 cycloalkyl groups and C5-C12 aryl groups, and m is an integer from 3 to 20 and preferably from 5 to 15, wherein preferably the number of radicals R 11 , R 12 , R 13 and R 14 , which are a functional group, based on the total number of residues R 11 , R 12 , R 13 and R 14 5 to 95% and preferably 10 to 15%.

21. Process according to at least one of claims 18 to 20, characterized in that the at least one polysiloxane compound ii) is a linear polysiloxane according to the following general formula (V): R 11 -(SiR 12 R 13 O-)n2-R 14 (V), wherein: R 11 , R 12 , R 13 and R 14are independently of one another identical or different and are selected from functional groups, hydrogen, C1-C20 alkyl groups, C2-C20 alkenyl groups, C2-C20 alkynyl groups, C3-C12 cycloalkyl groups and Cs-Ci2 aryl groups, and n2 is an integer from 3 to 500 and preferably from 20 to 150, wherein preferably the number of radicals R 11 , R 12 , R 13 and R 14 , which are a functional group, based on the total number of residues R 11 , R 12 , R 13 and R 14 5 to 95% and preferably 10 to 30%.

22. Process according to at least one of claims 18 to 21, characterized in that the at least one polysiloxane compound ii) is a dendritically branched polysiloxane containing structural units according to the following general formula (VI): -(SiR 12 R 13 O-)n3- (VI), where: R 12 and R 13are independently of one another identical or different and are selected from functional groups, hydrogen, C1-C20 alkyl groups, C2-C20 alkenyl groups, C2-C20 alkynyl groups, C3-C12 cycloalkyl groups and Cs-Ci2 aryl groups, and ns is an integer from 1 to 20 and preferably from 3 to 8, wherein preferably the number of radicals R 12 and R 13 , which are a functional group, based on the total number of residues R 12 and R 13 5 to 95% and preferably 10 to 30%.

23. Process according to at least one of claims 18 to 22, characterized in that the at least one polysiloxane compound ii) is a cyclic polysiloxane according to the following general formula (VII): L(SiR 12 R 13 O-) n4 J (VII) . in which: R 12 and R 13are independently of one another identical or different and are selected from functional groups, hydrogen, C1-C20 alkyl groups, C2-C20 alkenyl groups, C2-C20 alkynyl groups, C3-C12 cycloalkyl groups and Cs-Ci2 aryl groups, and n4 is an integer from 3 to 8 and preferably from 3 to 6, wherein preferably the number of radicals R 12 and R 13 , which are a functional group, based on the total number of residues R 12 and R 13 5 to 95% and preferably 10 to 30%.

24. The method according to at least one of claims 18 to 23, characterized in that one or more polymers selected from polyepoxides and polyepoxides having at least one functional group are reacted with at least one polysiloxane compound ii) which contains one or more amine groups as functional group(s).

25. The method according to at least one of claims 18 to 24, characterized in that one or more polymers selected from polyepoxides and polyepoxides having at least one functional group are reacted with at least one polysiloxane compound ii) which contains one or more amine groups as functional group(s), and at least one amine crosslinker iii) which does not contain any siloxane groups, wherein the at least one amine crosslinker iii) preferably a diamine compound comprising alkyl group(s) and / or aryl groups.

26. Component obtainable by a process according to at least one of claims 18 to 25.

Images