Method for treating the surface of an elastomer material, method for treating the surface of an elastomer component, elastomer material, elastomer component

Abstract

The invention relates to an elastomer component (18, 20, 64), the elastomer component comprising: a component region which is produced from an elastomer material (48), wherein the component region is chemically modified at least in sections at least on its surface (50), and wherein an IR spectrum of a chemically modified surface section of the surface (50) has a carbonyl group signal at a wave number between 1700 cm -1 and 1730 cm -1. The invention also relates to a method for producing an elastomer material, to a method for producing an elastomer component, and to an elastomer material.

Description

[0001] DREISS PATENT ATTORNEYS 11.12.2025

[0002] •■■■ ■ ■ , 16960594WO2

[0003] 535950.0

[0004] GEMÜ Gebr. Müller Apparatebau GmbH & Co. Kommanditgesellschaft Gert-Müller-Platz 1 74635 Kupferzell

[0005] Method for surface treatment of an elastomer material, method for surface treatment of an elastomer component, elastomer material, elastomer component

[0006] The present invention relates to the field of elastomeric materials. In particular, the present invention relates to a method for the surface treatment of an elastomeric material, a method for the surface treatment of an elastomeric component, an elastomeric material and an elastomeric component.

[0007] Elastomeric materials such as synthetic rubbers are used, for example, in sealing elements or membranes. Due to the elastic deformability of elastomeric materials, an effective seal can be achieved between the elastomeric material and an adjacent component, such as a housing part. However, especially under pressure, elastomeric materials, or elastomeric components made from elastomeric materials, tend to adhere to adjacent components. This can make the residue-free removal of elastomeric components after their service life difficult. Furthermore, particles can easily adhere to elastomeric materials, and their wettability with water is typically low. These two effects make cleaning elastomeric materials or elastomeric components more difficult.

[0008] Elastomeric materials are typically oxidizable. For example, it is known that elastomeric materials are treated with ozone as part of environmental tests, which leads to oxidation of the elastomeric materials. Such environmental tests are intended to investigate the resistance of the elastomeric materials to chemicals. In particular, the elastomeric materials are immersed in ozonated water for an extended period, e.g., 72 hours. However, the treatment with ozone, and the associated oxidation, damages the elastomeric materials, impairing their functionality.

[0009] The invention addresses the problem of providing an elastomer material or an elastomer component with reduced adhesion tendency.

[0010] One aspect of the description concerns a process for the surface treatment of an elastomer material.

[0011] The process begins with the provision of an elastomer material. At least one surface section of the elastomer material is then irradiated with UV radiation, causing a chemical change in this surface section. The irradiation of the elastomer material with UV radiation thus leads to a chemical reaction within the surface section. This means that, under the influence of UV radiation, chemical bonds within the elastomer material are broken and / or reformed.

[0012] The inventors discovered that irradiating elastomeric materials with UV radiation over an extended period and within a specific frequency range can reduce their tendency to stick. This reduced adhesion addresses a decades-old problem: elastomer components tend to stick to adjacent components due to contact pressure. In the case of a diaphragm valve, an elastomer diaphragm is pressed between two housing halves to prevent the process medium from escaping the process channel. After several months to several years of use, the diaphragm needs to be replaced. This typically requires considerable force to separate the two housing halves due to the adhesion. Furthermore, pieces of the elastomer can detach from the diaphragm and remain attached to the housing halves. Diaphragm valve operators regularly request a solution to this problem.looking for membranes with reduced adhesion. Solutions such as...

[0013] Inserts or coatings in the clamping area can lead to reduced sealing performance and are therefore unsuitable for most applications.

[0014] Furthermore, the wettability of the elastomer materials with water was also increased, which, especially in combination with the reduced tendency to stick, facilitates the cleaning of the elastomer materials. The hydrophilic properties of the elastomer material were thus enhanced by UV irradiation. Depending on the application of the elastomer materials, this results in various advantages. If the surface-treated elastomer material is used, for example, as a material in a replacement component, the reduced tendency to stick to adjacent components makes it easier to remove the replacement component. If the surface-treated elastomer material is used, for example, in a fluid flow system, the improved cleanability means that fewer particles enter the process fluid flow during operation of the fluid flow system.

[0015] It is assumed that the chemical change on the surface of the elastomer materials triggered by UV irradiation is an oxidative change. Specifically, changes in the IR spectrum of the elastomer materials were observed after UV irradiation, which are associated with an oxidative change.

[0016] In some embodiments, an IR spectrum of the surface section before irradiation is free of a carbonyl group signal in a wavenumber range between 1700 cm⁻¹. -1 and 1730 cm' 1 An IR spectrum is in the wavenumber range between 1700 cm⁻¹ 1 and 1730 cm' 1The wavenumber is considered free of a carbonyl group signal if no signal corresponding to a carbonyl group is present in this wavenumber range and is significantly different from the measurement noise. A signal is considered significantly different from the measurement noise if it is at least three times the standard deviation of the measurement noise. Preferably, the elastomer material is irradiated with UV radiation such that the IR spectrum of the chemically modified surface section shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹. 1 and 1730 cm' 1 exhibits this. The carbonyl group signal thus arises due to the chemical change of the surface region, which is triggered by UV irradiation. Typically, the carbonyl group signal occurs in a wavenumber range between 1710 cm' 1 and 1720 cm' 1The specific position of the carbonyl group signal is influenced by the chemical environment of the corresponding carbonyl group. In the elastomer material ethylene propylene diene monomer rubber (EPDM), a carbonyl group signal was observed at a wavenumber of 1712 cm'. 1 observed. Preferably, the carbonyl group signal is an aldehyde group signal or a ketone group signal.

[0017] In some other embodiments, the IR spectrum of the surface section already shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹ before irradiation. 1 and 1730 cm' 1Preferably, in these embodiments, the elastomer material is irradiated with UV radiation in such a way that the carbonyl group signal is amplified. The intensity of the carbonyl group signal is thus increased by the UV irradiation. A carbonyl group signal may already be present before irradiation, for example, if the elastomer material contains an additive material that has one or more carbonyl groups and consequently causes the carbonyl group signal even before irradiation.

[0018] The disclosure assumes that a signal would then be present at a wavenumber between 1700 cm. -1 and 1730 cm 1 This occurs when the maximum of the signal is at a wavenumber between 1700 cm⁻¹. -1 and 1730 cm -1 It is therefore not excluded that a rising edge and / or a falling edge of the carbonyl group signal originates from the wavenumber range between 1700 cm⁻¹. -1 and 1730 cm1 extend out.

[0019] In some embodiments of the method, it is provided that the entire surface of the elastomer material is irradiated with UV radiation and chemically modified.

[0020] In some other embodiments of the method, it is provided that only a surface section of the elastomer material is irradiated with UV radiation and chemically modified. In particular, the surface of the elastomer material has a first side and a second side facing away from the first, wherein only one of the sides is irradiated with UV radiation and chemically modified. In particular, the surface of the elastomer material is sectionally masked during irradiation with UV radiation, so that only an unmasked surface section is irradiated with UV radiation and chemically modified.

[0021] The provided elastomer material can exist in various forms during irradiation with UV radiation.

[0022] In some embodiments, a sheet-shaped elastomer material is provided and irradiated with UV radiation. With a sheet-shaped structure, the length and width are significantly greater than the thickness.

[0023] In some embodiments, a ribbon-shaped elastomer material is provided and irradiated with UV radiation. In a ribbon-shaped structure, the length is significantly greater than the width. The width, in turn, is significantly greater than the thickness.

[0024] In some embodiments, a film-shaped elastomer material is provided and irradiated with UV radiation. In a film-shaped structure, the length and width are significantly greater than the thickness. Compared to a plate-shaped structure, the thickness of a film-shaped structure is even less, making the film-shaped elastomer material flexible and pliable.

[0025] In some embodiments, a bulk elastomer material is provided and irradiated with UV radiation. A bulk elastomer material is in an unstructured form without any special surface structuring or fine particle distribution.

[0026] In some embodiments, a granular elastomer material is provided and irradiated with UV radiation. A granular elastomer material consists of granular particles that have approximately a similar size and shape.

[0027] Preferably, the irradiation is carried out in an oxygen-containing atmosphere. The elastomer material is thus placed in an oxygen-containing atmosphere and irradiated with UV radiation within this atmosphere. Within the scope of this disclosure, the term "oxygen-containing atmosphere" refers to an atmosphere in which the mass fraction of oxygen is at least 1 wt.%. An oxygen-containing atmosphere has the advantage of promoting the oxidative change occurring in the elastomer material. Preferably, the UV irradiation is carried out in an oxygen-containing atmosphere in which the mass fraction of oxygen is at least 5 wt.%.

[0028] Preferably, the irradiation is carried out in an atmosphere where the nitrogen mass fraction is at least 90 wt.%. An atmosphere with such a high nitrogen content has the advantage that the UV radiation is only slightly attenuated by the atmosphere. Particularly preferably, the irradiation is carried out in an atmosphere where the nitrogen mass fraction is at least 90 wt.% and the oxygen mass fraction is at least 1 wt.%.

[0029] Preferably, in other embodiments, irradiation is carried out in a vacuum or at a significantly reduced atmospheric pressure, particularly when there is a greater distance between the UV source and the irradiation target. The vacuum or the reduced atmospheric pressure then has the advantage that the UV radiation between the UV source and the elastomer material is attenuated only minimally, if at all.

[0030] The surface treatment process can be used with various elastomer materials. Preferably, the elastomer is a synthetic rubber, in particular ethylene propylene diene monomer (EPDM), styrene-butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), or fluororubber (FKM), or a polysiloxane. An ethylene propylene diene monomer (EPDM) is particularly preferred. The observed change in surface properties is especially pronounced in synthetic rubbers that have residual double bonds in the side chain. EPDM is one example. It is therefore assumed that the double bonds and / or the allylic positions adjacent to the double bonds constitute the primary reactive sites in the elastomer materials.

[0031] In some preferred embodiments, the elastomer material is fluorine-free both before and after irradiation with UV radiation. This means that no fluorine atoms are present in the main chains of the elastomer material, nor in any side chains that may be present. Preferably, the elastomer material is a fluorine-free and, in particular, silicone-free synthetic rubber.

[0032] In some preferred embodiments, the elastomer material is a non-side-chain functionalized elastomer material both before and after irradiation with UV radiation. The elastomer material is therefore not modified by grafting or other side-chain modifications.

[0033] In some preferred embodiments, a UV source is provided, and the elastomer material is positioned within an exposure area of ​​the UV source to irradiate the elastomer material with UV radiation. The UV source can be, for example, a UV lamp or a UV LED. Multiple UV sources can also be used.

[0034] In some preferred embodiments, the UV radiation has a central wavelength of at least 150 nm and at most 350 nm. Due to their energy content, light quanta in this wavelength range lead to an effective chemical modification of the surface of the elastomer material.

[0035] Preferably, the surface section of the elastomer material is irradiated for a duration of at least 10 minutes, and particularly preferably for a duration of at least 15 minutes. It has been shown that the advantageous effects associated with irradiation, especially the reduced tendency to stick, are particularly pronounced with such an irradiation duration. Preferably, the irradiation duration is at most 2 hours. Preferably, the surface section is irradiated with an area energy of at least 200 Ws / cm². 2 irradiated.

[0036] In some preferred embodiments, the surface section is irradiated for such a long time that an IR spectrum of the irradiated and chemically modified surface section shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹. -1 and 1730 cm -1exhibits, wherein the ratio of the signal area of ​​a signal arrangement at a wavenumber between 2600 cm -1 and 3000 cm -1 The signal area of ​​the carbonyl group signal is at most 50:1. Therefore, the signal area of ​​the signal arrangement is at most 50 times larger than the signal area of ​​the carbonyl signal. With the signal arrangement, the totality of signals between 2600 cm -1 and 3000 cm -1 This means that the signal area of ​​the signal arrangement corresponds to the integral of all signals in the wavenumber range between 2600 cm⁻¹. -1 and 3000 cm -1 In the wavenumber range between 2600 cm⁻¹ -1 and 3000 cm -1Typically, CH stretching vibrations of the elastomer material occur. The signal area of ​​the corresponding signals is essentially independent of the chemical change induced by UV irradiation. Consequently, the signal arrangement can be adjusted at wavenumbers between 2600 cm⁻¹. -1 and 3000 cm -1This serves as a reference for the intensity of the carbonyl group signal. It has been shown that the advantageous properties associated with the chemical modification of the elastomer material are particularly pronounced at a ratio of at most 50:1. Preferably, the surface section is irradiated for such a long time that the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 50:1 and at least 5:1. More preferably, the surface section is irradiated for such a long time that the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 30:1, preferably at most 30:1 and at least 5:1. The signal area of ​​the signal arrangement is therefore at most 30 times larger than the signal area of ​​the carbonyl group signal.

[0037] In some embodiments, the IR spectrum of the irradiated and chemically modified surface section exhibits a signal arrangement at a wavenumber between 1000 cm⁻¹. -1 and 1200 cm' 1 Preferably, the surface section is irradiated for such a long time that the ratio of the signal area of ​​the signal arrangement at the wavenumber between 2600 cm' 1 and 3000 cm' 1 to the signal area of ​​the signal arrangement at a wavenumber between 1000 cm' 1 and 1200 cm' 1 at most 10:1, preferably at most 5:1. With the signal arrangement between 1000 cm' 1 and 1200 cm' 1 This refers to all signals within this wavenumber range. In the wavenumber range between 1000 cm⁻¹ -1 and 1200 cm -1COC stretching vibrations of ether groups typically occur. Ether groups can form in the elastomer material as a result of UV irradiation. These ether groups can be located within a polymer chain or link adjacent polymer chains together. Depending on the chemical environment of the ether groups, several signals in the wavenumber range between 1000 cm⁻¹ can be observed. -1 and 1200 cm -1 The ether groups cause cross-linking of the elastomer material. This allows for the optimization of various surface properties of the polymer material, especially the coefficient of sliding friction.

[0038] A second aspect of the description concerns a method for manufacturing an elastomer component.

[0039] The process according to the second aspect comprises the surface treatment of an elastomer material by a process according to the first aspect. The process according to the second aspect also comprises the manufacturing of an elastomer component, wherein at least one component area of ​​the elastomer component is manufactured from the surface-treated elastomer material. The elastomer material is therefore first irradiated with UV radiation and chemically modified. This process step is followed by the manufacturing of the elastomer component. It is possible to manufacture only one component area of ​​the elastomer component from the surface-treated elastomer material.

[0040] At least one other component area of ​​the elastomeric part is therefore manufactured from a different material. However, the entire elastomeric part can also be manufactured from the elastomeric material. Preferably, at least a portion of the uncoated outer surface of the finished component is formed by the irradiated surface section. This allows the advantageous properties of the irradiated surface section to be fully realized.

[0041] Depending on the shape of the elastomer material, different methods can be used to manufacture the component area of ​​the elastomer component or the entire elastomer component.

[0042] In some embodiments, the component area of ​​the elastomeric component, or the entire elastomeric component, is manufactured from the surface-treated elastomeric material using an injection molding process. For this purpose, the surface-treated elastomeric material can initially be in sheet, strip, or granular form, for example. The elastomeric material is then plasticized, fed into an injection molding machine, and formed into the desired shape by injection molding. Because the surface-treated elastomeric material is plasticized during an injection molding process, its surface does not necessarily correspond to the surface of the component area manufactured from it. In particular, the surface of the component area can also be formed by areas of the elastomeric material that were located within the elastomeric material and separated from its surface during UV irradiation.Statistically speaking, the surface of the component area is at least partially formed by the UV-irradiated and chemically modified elastomer material. Therefore, the advantageous properties of the UV-irradiated and chemically modified elastomer material continue to be present in the elastomer component.

[0043] In some embodiments, the component area of ​​the elastomeric component, or the entire elastomeric component, is manufactured from the surface-treated elastomeric material using a stamping process. For this purpose, the elastomeric material can initially be in sheet or strip form, for example. A stamping process has the advantage that the surface of the surface-treated elastomeric material then also forms the surface of the component area or the entire elastomeric component.

[0044] A third aspect of the description concerns a method for the surface treatment of an elastomer component.

[0045] The method comprises providing an elastomeric component that has at least one component area made of an elastomeric material. The method further comprises irradiating at least the component area with UV radiation, chemically modifying at least one surface section of the component area made of the elastomeric material.

[0046] Irradiating the component area with UV radiation can advantageously influence the surface properties of the elastomer material. Depending on the elastomer component, this results in various advantages, as previously explained in connection with the surface treatment process of the elastomer material. Preferably, at least a portion of the irradiated surface area of ​​the finished component is exposed to the UV radiation. This allows the advantageous properties of the irradiated surface area to be particularly pronounced. It is possible that only one component area of ​​the elastomer component is made of the elastomer material. The elastomer component can therefore have at least one other component area made of a different material. Alternatively, the entire elastomer component can be made of the elastomer material.

[0047] Preferably, the component area made of the elastomer material is irradiated with UV radiation in such a way that an IR spectrum of the chemically modified surface section shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹. -1 and 1730 cm -1 The carbonyl group signal is present in the surface area before UV irradiation. However, the surface section of the component that is subsequently irradiated is free of this signal before UV exposure. The carbonyl group signal therefore arises from the chemical change in the surface section caused by the UV irradiation.

[0048] In some embodiments of the method, it is provided that the entire surface of the component area is irradiated with UV radiation and chemically modified.

[0049] In some other embodiments of the method, it is provided that only a surface section of the component area is irradiated with UV radiation and chemically modified. In particular, the surface of the component area made of the elastomer material has a first side and a second side facing away from the first side, wherein only one of the two sides is irradiated with UV radiation and chemically modified. In particular, the surface of the component area made of the elastomer material is masked section by section during irradiation with UV radiation, so that only an unmasked surface section is irradiated with UV radiation and chemically modified.

[0050] Preferably, the UV irradiation is carried out in an oxygen-containing atmosphere. The elastomer component is thus placed in an oxygen-containing atmosphere and irradiated with UV radiation within this atmosphere. Preferably, the irradiation is carried out in an oxygen-containing atmosphere where the oxygen content is at least 5% by weight.

[0051] Preferably, the irradiation is carried out in an atmosphere where the mass fraction of nitrogen is at least 90 wt.%. Particularly preferably, the irradiation is carried out in an atmosphere where the mass fraction of nitrogen is at least 90 wt.% and the mass fraction of oxygen is at least 1 wt.%.

[0052] Preferably, in other embodiments, irradiation is carried out in a vacuum or with greatly reduced atmospheric pressure, especially if there is a larger distance between the UV source and the irradiation target.

[0053] The surface treatment process can be used with various elastomer materials. Preferably, the elastomer material of the component area is a synthetic rubber, in particular ethylene propylene diene monomer (EPDM), styrene-butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), or fluororubber (FKM), or a polysiloxane. An ethylene propylene diene monomer (EPDM) is particularly preferred. The observed change in surface properties is especially pronounced in synthetic rubbers that have residual double bonds in the side chain. EPDM is one example. It is therefore assumed that the double bonds and / or the allylic positions adjacent to the double bonds constitute the primary reactive sites in the elastomer materials.

[0054] In some preferred embodiments, the elastomer material is fluorine-free both before and after irradiation with UV radiation. This means that no fluorine atoms are present in the main chains of the elastomer material, nor in any side chains that may be present. Preferably, the elastomer material is a fluorine-free and, in particular, silicone-free synthetic rubber.

[0055] In some preferred embodiments, the elastomer material is a non-side-chain functionalized elastomer material both before and after irradiation with UV radiation.

[0056] In some preferred embodiments, a UV source is provided, and the elastomer component is positioned within the exposure area of ​​the UV source to irradiate the elastomeric component area with UV radiation. The UV source can be, for example, a UV lamp or a UV LED. Multiple UV sources can also be used.

[0057] In some preferred embodiments, the UV radiation has a central wavelength of at least 150 nm and at most 350 nm. Due to their energy content, light quanta in this wavelength range lead to an effective chemical modification of the surface of the component area.

[0058] Preferably, the component area is irradiated for a duration of at least 10 minutes, and particularly preferably for a duration of at least 15 minutes. It has been shown that the advantageous effects associated with irradiation, especially the reduced tendency to stick, are particularly pronounced with such an irradiation duration. Preferably, the irradiation duration is at most 2 hours.

[0059] Preferably, the component area is heated with a surface energy of at least 200 Ws / cm². 2 irradiated.

[0060] In some preferred embodiments, it is provided that the component area is irradiated for such a long time that an IR spectrum of the irradiated and chemically modified surface section of the component area shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹. -1 and 1730 cm -1exhibits, wherein the ratio of the signal area of ​​a signal arrangement at a wavenumber between 2600 cm -1 and 3000 cm -1 The signal area of ​​the carbonyl group signal is at most 50:1. Therefore, the signal area of ​​the signal arrangement is at most 50 times larger than the signal area of ​​the carbonyl signal. With the signal arrangement, the totality of signals between 2600 cm -1 and 3000 cm -1 This means that the signal area of ​​the signal arrangement corresponds to the integral of all signals in the wavenumber range between 2600 cm⁻¹. -1 and 3000 cm -1 In the wavenumber range between 2600 cm⁻¹ -1 and 3000 cm -1Typically, CH stretching vibrations of the elastomer material occur. The signal area of ​​the corresponding signals is essentially independent of the chemical change induced by UV irradiation. Consequently, the signal arrangement can be adjusted at wavenumbers between 2600 cm⁻¹. -1 and 3000 cm -1The carbonyl group signal intensity serves as a reference. It has been shown that the advantageous properties associated with the chemical modification of the elastomer material are particularly pronounced at a ratio of at most 50:1. Preferably, the component area is irradiated for such a long time that the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 50:1 and at least 5:1. More preferably, the component area is irradiated for such a long time that the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 30:1, preferably at most 30:1 and at least 5:1. The signal area of ​​the signal arrangement is therefore at most 30 times larger than the signal area of ​​the carbonyl group signal.

[0061] In some embodiments, the IR spectrum of the irradiated and chemically modified surface section exhibits a signal arrangement at a wavenumber between 1000 cm⁻¹. -1 and 1200 cm' 1 Preferably, the component area is irradiated for such a long time that the ratio of the signal area of ​​the signal arrangement at the wavenumber between 2600 cm' 1 and 3000 cm' 1 to the signal area of ​​the signal arrangement at a wavenumber between 1000 cm -1 and 1200 cm -1 The ratio is at most 10:1, preferably at most 5:1. A fourth aspect of the description concerns an elastomer material.

[0062] The elastomer material is chemically modified at least in certain sections of its surface. An IR spectrum of a chemically modified surface section of the elastomer material shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹. -1 and 1730 cm -1 on.

[0063] A chemical change in the surface area that leads to such a carbonyl group signal can be caused, for example, by UV radiation.

[0064] The inventors recognized that the adhesion tendency is reduced in such a chemically modified elastomer material. Depending on the application of the elastomer material, this results in various advantages, as described above.

[0065] In some preferred embodiments, the elastomer material is a synthetic rubber, in particular an ethylene propylene diene monomer (EPDM) rubber, a styrene butadiene rubber (SBR), an acrylonitrile butadiene rubber (NBR), a fluorocarbon rubber (FKM), or a polysiloxane. An ethylene propylene diene monomer (EPDM) rubber is particularly preferred. The observed change in surface properties is especially pronounced in such synthetic rubbers that have residual double bonds in the side chain. EPDM is one example. It is therefore assumed that the chemical change occurred at the double bonds and / or at the allylic positions adjacent to the double bonds.

[0066] In some preferred embodiments, the elastomer material is fluorine-free. Preferably, the elastomer material is a fluorine-free and, in particular, silicone-free synthetic rubber.

[0067] In some preferred embodiments, the elastomer material is provided to be a non-side-chain functionalized elastomer material.

[0068] In some preferred embodiments, the surface of the elastomer material has at least one chemically unmodified surface section, wherein an IR spectrum of the chemically unmodified surface section is free of the carbonyl group signal. Depending on the application, it may be preferred that only a surface section of the elastomer material is chemically modified, but not the entire surface of the elastomer material. For example, the elastomer material is plate-shaped, wherein a first side of the plate-shaped elastomer material is chemically modified and a second side facing away from the first side is not.

[0069] In some preferred embodiments, the IR spectrum of the chemically modified surface section is provided to have a signal arrangement at a wavenumber between 2600 cm⁻¹. -1 and 3000 cm -1exhibits a ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal of at most 50:1. The signal area of ​​the signal arrangement is therefore at most 50 times larger than the signal area of ​​the carbonyl signal. The signal arrangement covers the entirety of the signals between 2600 cm. -1 and 3000 cm -1 This means that the signal area of ​​the signal arrangement corresponds to the integral of all signals in the wavenumber range between 2600 cm⁻¹. -1 and 3000 cm' 1 In the wavenumber range between 2600 cm' 1 and 3000 cm' 1 Typically, CH stretching vibrations of the elastomer material occur. The signal area of ​​the corresponding signals is essentially independent of the chemical change induced by UV irradiation. Consequently, the signal arrangement can be adjusted at wavenumbers between 2600 cm⁻¹. 1 and 3000 cm' 1This serves as a reference for the intensity of the carbonyl group signal. It has been shown that the advantageous properties associated with the chemical modification of the elastomer material are particularly pronounced at a ratio of at most 50:1. Preferably, the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 50:1 and at least 5:1.

[0070] Preferably, the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 30:1, preferably at most 30:1 and at least 5:1. The signal area of ​​the signal arrangement is therefore at most 30 times larger than the signal area of ​​the carbonyl group signal.

[0071] In some embodiments, it is provided that the IR spectrum of the chemically modified surface section exhibits a signal arrangement at a wavenumber between 1000 cm⁻¹. 1 and 1200 cm' 1exhibits. Preferably, the ratio of the signal area of ​​the signal arrangement at the wavenumber is between 2600 cm². 1 and 3000 cm' 1 to the signal area of ​​the signal arrangement at a wavenumber between 1000 cm' 1 and 1200 cm' 1 at most 10:1, preferably at most 5:1. In some preferred embodiments, it is provided that an IR spectrum of a core region of the elastomer material is free of the carbonyl group signal. The elastomer material is therefore chemically modified only at its surface, compared to the core region, which is free of the carbonyl group signal. In this context, the term "core region" describes a region of the elastomer material that lies at least 1.0 mm from the surface of the elastomer material within the interior of the elastomer material.

[0072] In some preferred embodiments, an IR spectrum of a core region of the elastomer material exhibits the carbonyl group signal. Preferably, the IR spectrum of the core region shows the signal arrangement at a wavenumber between 2600 cm⁻¹. -1 and 3000 cm' 1 The elastomer material is characterized by a signal area of ​​at most 50:1, particularly preferably at most 30:1, where the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 50:1. The elastomer material can be homogeneous overall, such that its IR spectrum is essentially the same in every region. Such an elastomer material can be obtained, for example, by first surface-treating the elastomer material, thereby chemically modifying its surface. Subsequently, the elastomer material is plasticized, homogeneously mixed, and then formed into a desired shape.

[0073] In some preferred embodiments, it is provided that the IR spectrum of the chemically modified surface section is measured at a wavenumber between 3200 cm⁻¹ 1 and 3650 cm' 1 is free of a hydroxyl group signal. An IR spectrum is in the wavenumber range between 3200 cm⁻¹. 1 and 3650 cm' 1A signal is considered free of a hydroxyl group signal if no signal corresponding to a hydroxyl group is present in this wavenumber range and is significantly different from the measurement noise. A signal is considered significantly different from the measurement noise if it is at least three times the standard deviation of the measurement noise. Hydroxyl groups are undesirable in the chemically modified surface area because they typically increase adhesion. Irradiating the elastomer material with UV radiation can selectively achieve a chemical change that leads to the formation of carbonyl groups but not hydroxyl groups. In contrast, the aforementioned ozone treatment leads to uncontrolled oxidation, which also produces hydroxyl groups. It is preferred that the IR spectrum be free of a hydroxyl group signal.However, if a hydroxyl group signal is present, the ratio of the signal area of ​​the hydroxyl group signal to the signal area of ​​the carbonyl group signal is preferably at most 3:10, particularly preferably at most 1:10.

[0074] In some preferred embodiments, the chemically modified surface section has a coefficient of friction (Cf) of at most 1.30. Such a low coefficient of friction is advantageous in various applications, for example, when the elastomer material is used in an elastomer component that, during normal use, moves along another, particularly stationary, part. An example of this is sliding seals, which, during normal use, move along a sealing surface of a sealing partner. Furthermore, a low coefficient of friction is typically associated with reduced particle adhesion and a reduced tendency to stick to adjacent parts. The low coefficient of friction can be achieved by irradiating the elastomer material with UV radiation.

[0075] Within the scope of this disclosure, values ​​for the coefficient of sliding friction refer to those determined in accordance with EN ISO 8295:2004. In this method, a test specimen is moved on a measuring slide across a test table at a defined feed rate of 100 mm / min ± 10 mm / min. The test specimen is subjected to a normal force F by the measuring slide. P The force F is measured and applied by 1.96 N ± 0.02 N. D , which is required to maintain the motion at the defined feed rate. The coefficient of sliding friction is calculated as the quotient F D / F P .

[0076] In some preferred embodiments, the elastomer material has at least one chemically unmodified surface section, and the ratio of the coefficient of friction of the chemically modified surface section to the coefficient of friction of the chemically unmodified surface section is at most 0.75:1. The coefficient of friction of the chemically modified surface section is thus reduced by at least 25% compared to the coefficient of friction of the chemically unmodified surface section. Preferably, the ratio of the coefficient of friction of the chemically modified surface section to the coefficient of friction of the chemically unmodified surface section is at most 0.65:1. The coefficient of friction of the chemically modified surface section is thus reduced by at least 35% compared to the coefficient of friction of the chemically unmodified surface section.

[0077] In some preferred embodiments, the elastomer material is provided to be in the form of sheets, strips, films, bulk, or granules. Depending on the further processing of the elastomer material, other forms may be preferred.

[0078] A fifth aspect of the description concerns an elastomeric component. The elastomeric component comprises at least one component area made of an elastomeric material. The component area made of the elastomeric material is chemically modified, at least partially, on its surface. An IR spectrum of a chemically modified surface section of the component area shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹. -1 and 1730 cm -1 .

[0079] A chemical change in the surface area that leads to such a carbonyl group signal can be caused, for example, by UV radiation.

[0080] The inventors recognized that the adhesion tendency is reduced in such a chemically modified elastomer material. Depending on the application of the elastomer material, this results in various advantages, as described above.

[0081] It is possible that only one section of the elastomer component is made of the elastomer material. The elastomer component can therefore have at least one additional section made of a different material. However, the entire elastomer component can also be made of the elastomer material.

[0082] Preferably, at least part of an uncoated outer surface of the finished component is formed by the chemically modified surface section. This allows the advantageous properties of the surface section to be fully realized.

[0083] In some preferred embodiments, the elastomer material is a synthetic rubber, in particular an ethylene propylene diene monomer (EPDM) rubber, a styrene-butadiene rubber (SBR), an acrylonitrile butadiene rubber (NBR), a fluorocarbon rubber (FKM), or a polysiloxane. An ethylene propylene diene monomer (EPDM) rubber is particularly preferred. The observed change in surface properties is especially pronounced in synthetic rubbers that have residual double bonds in the side chain. EPDM is one such example. It is therefore assumed that the chemical change occurred at the double bonds and / or at the allylic positions adjacent to the double bonds. In some preferred embodiments, the elastomer material is fluorine-free. Preferably, the elastomer material is a fluorine-free and, in particular, silicone-free synthetic rubber.

[0084] In some preferred embodiments, the elastomer material is provided to be a non-side-chain functionalized elastomer material.

[0085] In some preferred embodiments, the surface of the component area has at least one chemically unmodified surface section, wherein an IR spectrum of the chemically unmodified surface section is free of the carbonyl group signal. Depending on the application, it may be preferred that only a surface section of the component area is chemically modified, but not the entire surface of the component area.

[0086] In some preferred embodiments, the IR spectrum of the chemically modified surface section is provided to have a signal arrangement at a wavenumber between 2600 cm⁻¹. -1 and 3000 cm -1exhibits a ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal of at most 50:1. The signal area of ​​the signal arrangement is therefore at most 50 times larger than the signal area of ​​the carbonyl signal. The signal arrangement covers the entirety of the signals between 2600 cm. -1 and 3000 cm -1 This means that the signal area of ​​the signal arrangement corresponds to the integral of all signals in the wavenumber range between 2600 cm⁻¹. -1 and 3000 cm' 1 In the wavenumber range between 2600 cm' 1 and 3000 cm' 1 Typically, CH stretching vibrations of the elastomer material occur. The signal area of ​​the corresponding signals is essentially independent of the chemical change induced by UV irradiation. Consequently, the signal arrangement can be adjusted at wavenumbers between 2600 cm⁻¹. 1 and 3000 cm' 1to serve as a reference for the intensity of the carbonyl signal. It has been shown that the advantageous properties associated with the chemical modification of the elastomer material are particularly pronounced at a ratio of at most 50:1. Preferably, the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 50:1 and at least 5:1. Preferably, the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 30:1, more preferably at most 30:1 and at least 5:1. The signal area of ​​the signal arrangement is thus at most 30 times larger than the signal area of ​​the carbonyl group signal. In some embodiments, it is provided that the IR spectrum of the chemically modified surface section of a signal arrangement is measured at a wavenumber between 1000 cm⁻¹. -1 and 1200 cm' 1exhibits. Preferably, the ratio of the signal area of ​​the signal arrangement at the wavenumber is between 2600 cm². 1 and 3000 cm' 1 to the signal area of ​​the signal arrangement at a wavenumber between 1000 cm' 1 and 1200 cm' 1 at most 10:1, preferably at most 5:1.

[0087] In some preferred embodiments, the IR spectrum of a core region of the component area is free of the carbonyl group signal. Thus, the component area is chemically modified only at its surface, compared to the core region, which is free of the carbonyl group signal. In this context, the term "core region" describes a region of the component area located at least 1.0 mm from the surface of the component area within the component area.

[0088] In some preferred embodiments, an IR spectrum of a core region of the component area exhibits the carbonyl group signal. Preferably, the IR spectrum of the core region exhibits the signal arrangement at a wavenumber between 2600 cm⁻¹. 1 and 3000 cm' 1 wherein the ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal is at most 50:1, particularly preferably at most 30:1. The component area can be homogeneous overall with respect to the elastomer material, so that its IR spectrum is essentially the same in every area.

[0089] In some preferred embodiments, it is provided that the IR spectrum of the chemically modified surface section is measured at a wavenumber between 3200 cm⁻¹ 1 and 3650 cm' 1The IR spectrum is free of a hydroxyl group signal. Hydroxyl groups are undesirable in the chemically modified surface area because they typically increase adhesion. Irradiating the elastomer material with UV radiation can selectively achieve a chemical modification that leads to the formation of carbonyl groups but not hydroxyl groups. It is preferred that the IR spectrum is free of a hydroxyl group signal. However, if a hydroxyl group signal is present, the ratio of the signal area of ​​the hydroxyl group signal to the signal area of ​​the carbonyl group signal is preferably at most 3:10, and particularly preferably at most 1:10.

[0090] In some preferred embodiments, the chemically modified surface section is provided to have a coefficient of friction (PG) of at most 1.30. Such a low coefficient of friction is advantageous in various applications and is associated with reduced particle adhesion and a reduced tendency to stick to adjacent parts. The low coefficient of friction can be achieved by irradiating the component area with UV radiation.

[0091] In some preferred embodiments, the component area has at least one chemically unmodified surface section, and the ratio of the coefficient of friction of the chemically modified surface section to the coefficient of friction of the chemically unmodified surface section is at most 0.75:1. The coefficient of friction of the chemically modified surface section is thus reduced by at least 25% compared to the coefficient of friction of the chemically unmodified surface section. Preferably, the ratio of the coefficient of friction of the chemically modified surface section to the coefficient of friction of the chemically unmodified surface section is at most 0.65:1. The coefficient of friction of the chemically modified surface section is thus reduced by at least 35% compared to the coefficient of friction of the chemically unmodified surface section.

[0092] In some preferred embodiments, the elastomer component is provided to be flat, annular, tubular, or cavernous. A cavernous structure is a structure that has one or more internal cavities.

[0093] A prime example of a cavernous elastomer component is a valve liner. In process valve technology, a liner is an internal insert placed within the rigid outer body of a valve, forming the inner wall and the interior of the shut-off section. It separates the process medium from the valve body, protects the medium from chemical and mechanical influences, and provides a suitable media-carrying surface. The liner is manufactured from the materials mentioned in this description and surface-treated according to the requirements of the specific process. A liner can also be designed as a replaceable component to facilitate maintenance and adaptation to different process media.

[0094] In some preferred embodiments, the elastomer component is a membrane, in particular a valve diaphragm or a pump diaphragm. The advantageous properties of the chemically modified surface section are particularly evident in a membrane. Preferably, the membrane is monolithically manufactured from the elastomer material. However, the membrane can also have at least one further component area made of a different material. For example, the membrane can be multilayered, with typically only one of the layers being made of the elastomer material.

[0095] In some preferred embodiments, the elastomer component, designed as a membrane, has a media-contacting area. Within the scope of this disclosure, the term "media-contacting area" refers to the region of a membrane that, when the membrane is installed as intended in a device such as a diaphragm valve or a diaphragm pump, comes into contact with the process fluid during operation of the device. For example, the media-contacting area of ​​the membrane, with respect to an axis oriented perpendicular to the membrane and passing through its center, can be a radially inner region of the membrane. Preferably, the media-contacting area is made of the elastomer material and its surface is at least partially chemically modified. This has the advantage of reducing particle adhesion to the media-contacting area and facilitating cleaning.This, in turn, results in fewer particles entering the process fluid during operation. When the diaphragm is used as a valve diaphragm in a diaphragm valve, the wetted portion of the diaphragm is typically pressed against a fixed valve seat to block a process fluid channel. The chemical modification of the wetted surface has the additional advantage of preventing the wetted area from adhering to the valve seat. Adhesion to the valve seat significantly impacts the service life of a diaphragm, as it must be detached from the valve seat with each switching cycle. With heavily stressed diaphragms, parts of the diaphragm can remain on the seat, reducing the seal.

[0096] In some preferred embodiments, the elastomer component, designed as a membrane, has a clamping area that can be clamped between two housing parts. For example, the clamping area of ​​the membrane, relative to an axis perpendicular to the membrane and passing through its center, can be a radially outer, and in particular annular, region of the membrane. Preferably, the clamping area is made of the elastomer material and its surface is chemically modified, at least in sections. The chemical modification of the clamping area's surface has the advantage of reducing adhesion of the clamping area to the housing parts. Consequently, the membrane can be replaced more easily after its service life. In some preferred embodiments, the elastomer component is a sealing element. The advantages described above also arise in this context.The sealing element can be designed, for example, as an O-ring, flat gasket or sliding seal.

[0097] In the case of a sliding seal, such as one used in a hydraulic cylinder, the advantages associated with reduced static friction are particularly pronounced. Firstly, reduced static friction leads to increased energy efficiency, as less force is required to move the sliding seal or the component incorporating it. The reduced static friction also results in less wear on the sliding seal, thus increasing cost-efficiency. Furthermore, reduced static friction enables smoother and more precise movement of the component incorporating the sliding seal. Finally, reduced static friction also leads to lower heat generation during operation. This reduces the risk of thermal damage or material degradation.

[0098] A sixth aspect of the description concerns a diaphragm valve.

[0099] The diaphragm valve comprises an elastomer component designed as a valve diaphragm, as described in the fifth aspect. The diaphragm valve also includes a valve body with an opening that leads to a fixed valve seat. The opening is closed by the diaphragm. The valve body and the diaphragm together define a process fluid channel. The diaphragm is movable between an open and a closed position. In the open position, a process fluid flow is permitted through the process fluid channel via the fixed valve seat. Thus, there is a fluid passage between the diaphragm and the valve seat. In the closed position, the process fluid flow is blocked by the valve diaphragm being in contact with the fixed valve seat.

[0100] Regarding the advantages achievable with the diaphragm valve, reference is made to the relevant explanations concerning the elastomer component designed as a diaphragm. The features described in connection with the diaphragm can be used for further development of the diaphragm valve.

[0101] The area of ​​the valve diaphragm that, together with the valve body, defines the process fluid channel is referred to as the wetted area. The wetted area may include a contact section that rests against the valve seat when the diaphragm valve is closed. Preferably, the surface of the valve diaphragm is chemically modified at least in the area of ​​the contact section. In the remaining sections of the wetted area, the surface may be chemically unmodified. However, the surface of the valve diaphragm may also be chemically modified across the entire wetted area.

[0102] In some embodiments, the diaphragm valve comprises a valve body and a valve component formed separately from the first valve body, the valve body comprising the valve seat. The valve diaphragm can have a clamping area that is clamped between the valve body and the valve component. The valve body and the valve component thus exert a clamping force on the clamping area. This increases the sealing effect between the diaphragm and the valve components. Preferably, the surface of the valve diaphragm is chemically modified, at least in the clamping area.

[0103] Preferably, the diaphragm valve comprises an actuator that is operatively connected to the valve diaphragm and is designed to move the valve diaphragm between the open position and the closed position.

[0104] A seventh aspect of the description concerns a diaphragm pump.

[0105] The diaphragm pump comprises an elastomer component designed as a pump diaphragm, as described in the fifth aspect. The diaphragm pump also comprises a pump body, the pump body and the pump diaphragm together defining a pressure chamber. The pump body has a fluid inlet with an inlet valve and a fluid outlet with an outlet valve, both fluidically connected to the pressure chamber. The volume of the pressure chamber can be increased or decreased by moving the pump diaphragm.

[0106] Regarding the advantages achievable with the diaphragm pump, reference is made to the relevant explanations concerning the elastomer component designed as a diaphragm. The features described in connection with the diaphragm can be used for further development of the diaphragm pump.

[0107] The area of ​​the pump diaphragm that, together with the pump body, defines the pressure chamber is referred to as the wetted area. Preferably, the surface of the pump diaphragm is chemically modified, at least in the wetted area.

[0108] In some embodiments, the pump body comprises a first pump body part and a second pump body part separate from the first. The pump diaphragm can have a clamping area that is clamped between the first and second pump body parts. The pump body parts thus exert a clamping force on the clamping area. This increases the sealing effect between the pump diaphragm and the pump body parts. Preferably, the surface of the pump diaphragm is chemically modified, at least in the clamping area.

[0109] Preferably, the diaphragm pump comprises a drive unit that is operatively connected to the pump diaphragm and is designed to move the pump diaphragm.

[0110] The invention will be explained in more detail below with reference to the drawings.

[0111] Figure 1 shows a schematic sectional view of a diaphragm valve according to an exemplary embodiment;

[0112] Figure 2 shows a perspective view of a valve diaphragm of the diaphragm valve from Figure 1;

[0113] Figure 3 shows a cross-sectional view of the valve diaphragm from Figure 2;

[0114] Figure 4 shows a method for manufacturing the valve diaphragm from Figure 2;

[0115] Figure 5 shows an IR spectrum of a chemically unaltered surface section of the valve diaphragm from Figure 2;

[0116] Figure 6 shows an IR spectrum of a chemically modified surface section of the valve diaphragm from Figure 2; and

[0117] Figure 7 shows a schematic sectional view of a diaphragm pump according to an exemplary embodiment.

[0118] Figure 1 shows a schematic sectional view of a diaphragm valve 10 according to an exemplary embodiment. The diaphragm valve 10 comprises a valve body 12. The valve body 12 comprises a fixed valve seat 14 and an opening 16 leading to the fixed valve seat 14.

[0119] The diaphragm valve 10 also includes an elastomer component 18, which is designed as a valve diaphragm 20. In Figures 2 and 3, only the valve diaphragm 20 is shown. The valve diaphragm 20 extends in an area defined by two surface directions x and y. The opening 16 of the valve body 12 is closed by the valve diaphragm 20. The valve diaphragm 20 is located opposite the stationary valve seat 14. The valve body 12 and the valve diaphragm 20 together define a process fluid channel 28 that extends through the diaphragm valve 10. A region 22 of the valve diaphragm 20 that defines the process fluid channel 28 is referred to below as the wetted area 22 of the valve diaphragm 20.

[0120] The diaphragm valve 10 comprises the valve body and at least one separate further valve component 26, in this case a housing. Alternatively, an intermediate piece or an actuator-side clamping section can also constitute the valve component 26. The valve body 24 comprises a passage 56 that extends through the valve body 12 and delimits the process fluid channel 28 on the valve body side.

[0121] In this case, the valve diaphragm 20 is held or clamped between the valve body 12 and the valve component 26. A region 30 of the valve diaphragm 20 located between the valve body 12 and the valve component 26 is hereinafter referred to as the clamping region 30 of the valve diaphragm 20. The clamping region 30 is clamped between the valve body 12 and the valve component 26. The valve body 12 and the valve component 26 thus exert a clamping force on the clamping region 30. This increases the sealing effect between the valve body 12 and the valve component. To generate the clamping force, the valve component 26 bears against the valve body 12. The clamping region 30 has a first contact surface 32 and a second contact surface 34 facing away from the first contact surface 32. The first contact surface 32 is in surface contact with the first valve body 12. The second contact surface 34 is in surface contact with the valve component 26.

[0122] With respect to an axis 36 oriented perpendicular to the valve diaphragm 20, i.e. perpendicular to the surface directions x and y, and passing through the center of the valve diaphragm 20, the media-contacting area 22 is a radially inner area of ​​the valve diaphragm 20. The clamping area 30 is a radially outer edge area of ​​the valve diaphragm 20 that surrounds the media-contacting area 22.

[0123] The clamping area 30 comprises several mounting openings 38 extending through it. These mounting openings are designed to accommodate fastening elements (not shown). The fastening elements can be used to fasten the valve body 12 and the valve component 26 together. Furthermore, the fastening elements can secure the valve diaphragm 20 against slippage along the surface directions x, y. The valve diaphragm 20 is movable between an open and a closed position. In this design, the valve diaphragm 20 is moved between the open and closed positions by deformation of the media-contacting area 22. Alternatively, the valve diaphragm 20 can also be moved between the open and closed positions by a translational movement, in which deformation of the valve diaphragm 20 is avoided.

[0124] In the open position, the valve diaphragm 20 allows a process fluid flow through the process fluid channel 28 via the stationary valve seat 14. In the closed position, the process fluid flow is blocked by the contact area 22 of the valve diaphragm 20 against the valve seat 14. The section of the contact area 22 that rests against the valve seat 14 is referred to as the sealing section or contact section 58. Figure 1 shows the valve diaphragm 20 in the open position. As can be seen in Figure 1, in the present embodiment, the valve diaphragm 20 is curved away from the valve seat 14 in the open position. Alternatively, in the open position, the valve diaphragm 20 can also be curved towards the valve seat 14 or extend in a plane. The closed position of the valve diaphragm 20 is indicated by dashed lines in Figure 1.

[0125] The diaphragm valve 10 also includes an actuator 40. The actuator 40 is operatively connected to the valve diaphragm 20 and is designed to move the valve diaphragm 20 between the open position and the closed position. In this case, the actuator 40 is arranged in the valve component 26.

[0126] The valve diaphragm 20 is operatively connected to the actuator 40 via an actuator rod 42. The actuator 40 transmits a force to the actuator rod 42 to move it along an actuating axis in the direction indicated by the double arrow 45. In this case, the actuating axis corresponds to the axis 36, which is oriented perpendicular to the x and y planes and runs through the center of the valve diaphragm 20. The actuator rod 42 includes a connection interface 44 to forcefully connect the valve diaphragm 20 to the actuator rod 42. For example, a diaphragm pin 46 projects from the valve diaphragm 20 and is forcefully connected to the actuator rod 42 via the connection interface 44.

[0127] In the embodiment shown in Figures 1 to 3, the valve diaphragm 20 is monolithically formed, for example by injection molding. However, the valve diaphragm 20 can also have different areas made of different materials. For example, the wetted area 22 can be made of a different material, such as a fluoropolymer like PTFE, than the clamping area 30. A method for manufacturing the valve diaphragm 20 and the material properties of the valve diaphragm 20 are explained in more detail below with additional reference to Figures 4 to 6.

[0128] With regard to the manufacture of the valve diaphragm 20, an elastomer material 48 is provided in a first step 101. In this case, a plate-shaped elastomer material 48 is provided. However, the elastomer material 48 can also be in a different form. For example, the elastomer material 48 can alternatively be in strip or granular form.

[0129] In this case, the elastomer material 48 is a synthetic rubber, namely EPDM. This synthetic rubber is particularly preferred for the valve diaphragm 20 with regard to its material properties. However, other elastomer materials can also be used.

[0130] In a second step 103, the valve diaphragm 20 is manufactured from the elastomer material 48 by injection molding. For this purpose, the elastomer material 48 is first plasticized by heating and then pressed into a mold corresponding to the valve diaphragm 20 by an injection molding machine. The elastomer material 48 cools in the mold and solidifies in the shape of the valve diaphragm 20.

[0131] In a third step 105, at least a surface section of the surface 50 of the valve membrane 20 is irradiated with UV radiation. For this purpose, the valve membrane 20 is arranged in an exposure area 52 of a UV source 54, in this case a UV lamp 54.

[0132] In this case, the entire surface of the valve diaphragm 20, i.e., the entire surface 50, is irradiated with UV radiation. For example, one side of the valve diaphragm 20 can first be irradiated with UV radiation, and then the valve diaphragm 20 can be turned over and a second side, facing away from the first, is irradiated with UV radiation. Alternatively, it is also possible to selectively irradiate only one or more surface sections of the surface 50 with UV radiation. For example, only the area in contact with the medium 22 or only the clamping area 30 can be irradiated. This can be achieved by masking the other area during UV irradiation.

[0133] The UV irradiation chemically alters the surface of the elastomer material 48, specifically in the area of ​​the irradiated surface 50. This chemical change was investigated using IR spectroscopic methods. Figure 5 shows an IR spectrum of a non-UV-irradiated and chemically unchanged surface section of surface 50. Figure 6 shows an IR spectrum of a UV-irradiated and chemically altered surface section of surface 50. In this example, the surface section was irradiated with UV radiation for 30 minutes.

[0134] The measurement procedure begins with the preparation of the test specimen. This preparation includes standard steps such as cleaning and / or trimming the specimen. The prepared specimen is then examined in a Fourier-transform infrared (FT-IR) spectrometer. Radiation is generated by a Globar or Nernst rod source, focused by optical elements such as mirrors and slit apertures, and directed onto the specimen. The measurement is typically performed in the mid-infrared range of 4000–400 µrr. 1 , preferably with a resolution of 0.5-4 µm 1The IR radiation transmitted or reflected by the test specimen is recorded by a pyroelectric or MCT detector, and the resulting interferogram is converted into an infrared spectrum by Fourier transformation. After measurement, the raw spectrum is corrected for scattering effects or environmental disturbances, such as water or carbon dioxide absorption bands, using baseline correction and then normalized to ensure a uniform intensity scale. The corrected spectrum is analyzed by determining the positions, intensities, and widths of the characteristic absorption bands. This can include assigning the signals to specific functional groups such as C=O (carbonyl), OH (hydroxyl), or CH, for which an integrated reference database can be used.Isotope and matrix effects are accounted for by algorithms that analyze signal shifts and relative intensities compared to the expected banding patterns. Finally, a report is generated that includes the raw data, the corrected IR spectrum, the identified signals, and, in particular, their chemical significance, supplemented by a graphical representation of the signal positions. The area covered by individual signals can be determined by integrating the area under the curve in the region of the signal in question.

[0135] As can be seen from Figure 6, the IR spectrum of the chemically modified surface section shows a carbonyl group signal at 1710 cm⁻¹ -1This carbonyl group signal is absent in the IR spectrum from Figure 5. Therefore, UV irradiation of the surface 50 of the valve membrane 20 caused an oxidative change in the elastomer material 48 in the region of surface 50. The IR spectrum shown in Figure 6 is free of a hydroxyl group signal at a wavenumber between 3200 cm⁻¹. -1 and 3650 cm' 1 The oxidative change is therefore essentially characterized by the formation of carbonyl groups.

[0136] A core region of the valve diaphragm 20, i.e., a region within the valve diaphragm 20 spaced away from the surface 50, shows an IR spectrum without a carbonyl group signal even after UV irradiation. The UV irradiation thus only causes a surface change in the elastomer material 48. To record the IR spectrum of the core region, the surface 50 of the valve diaphragm 20 can be ablated.

[0137] In the case of double bonds, the chemical shift is strongly influenced by the chemical neighborhood (electron-withdrawing and electron-donating groups). For example, esters typically exhibit a carbonyl group signal at a wavenumber around 1735 cm'. 1 In contrast, the carbonyl group signal of the investigated elastomer materials was between 1700 cm' 1 and 1730 cm' 1 For example, the aforementioned polymers, ethylene propylene diene monomer rubber (EPDM), styrene-butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), or fluororubber (FKM), or a polysiloxane, typically have a maximum of their carbonyl group signal between 1710 cm' 1 and 1715 cm' 1 . In UV-irradiated EPDM, a band with a maximum at 1712 cm' was observed. 1 found.

[0138] The following table shows the ratio of the area of ​​the carbonyl group signal to the area of ​​the signal array at wavenumbers between 2600 cm'. 1 and 3000 cm' 1 as a function of the irradiation duration. The signal arrangement represents the totality of signals between 2600 cm'. 1 and 3000 cm' 1 This means that the area of ​​the signal array corresponds to the integral of all signals in the wavenumber range between 2600 cm'. 1 and 3000 cm' 1 In the wavenumber range between 2600 cm' 1 and 3000 cm' 1 The CH stretching vibrations of the elastomer material 48 typically occur. The signal area of ​​the corresponding signals is essentially independent of the chemical change induced by irradiation with UV radiation. Consequently, the signal arrangement can be adjusted at wavenumbers between 2600 cm⁻¹. 1 and 3000 cm' 1to serve as a reference for the intensity of the carbonyl group signal.

[0139] It is shown that up to an irradiation duration of 30 minutes, a strong increase in the intensity of the carbonyl group signal can be observed. However, with further UV irradiation, only a weak increase in the carbonyl group signal is achieved.

[0140] Irradiating the valve membrane 20 with UV radiation improved its surface properties. Specifically, the tendency of the valve membrane 20 to stick was reduced. At the same time, the wettability of the valve membrane 20 with water was increased.

[0141] The extent of the change in surface properties was determined by measuring the coefficient of sliding friction. For this purpose, the coefficient of sliding friction of four valve diaphragms 20 was investigated in a surface section irradiated with UV radiation. The irradiation duration was 30 minutes in each case. The resulting coefficient of sliding friction was 0.98 ± 0.16. Reference measurements on a surface section not irradiated with UV radiation showed that the coefficient of sliding friction was reduced by approximately 30% due to UV irradiation.

[0142] Depending on the surface area of ​​the valve diaphragm 20, UV irradiation offers different advantages. With regard to the clamping area 30, the advantage is that the tendency of the clamping area 30 to adhere to the valve body 12 and the valve component 26 is reduced. This facilitates residue-free replacement of the valve diaphragm 20 after its service life has expired. With regard to the media-contacting area 22, the advantage is that the cleanability of the valve diaphragm 20 is improved. With regard to the contact section 58 of the media-contacting area 22, an additional advantage is that the tendency of the contact section 58 to adhere to the valve seat 14 is reduced.

[0143] Figure 7 shows a schematic sectional view of a diaphragm pump 60 according to an exemplary embodiment. The diaphragm pump 60 comprises a pump body 62 and an elastomer component 18, which is designed as a pump diaphragm 64. Regarding the material of the pump diaphragm 64, reference is made to the preceding descriptions of the material of the valve diaphragm 20. The pump diaphragm 64 is also surface-treated by UV irradiation, as previously described.

[0144] The pump body 62 and the pump diaphragm 64 together define a pressure chamber 66. The pump body 64 includes a fluid inlet 68 and a fluid outlet 70, both fluidically connected to the pressure chamber 66. The fluid inlet 68 has an inlet valve 72. The fluid outlet 70 has an outlet valve 74. By moving the pump diaphragm 64, the volume of the pressure chamber 66 can be increased or decreased. In this way, by moving the pump diaphragm 64, the pressure in the pressure chamber 66 can be changed, and a process fluid can be pumped by the diaphragm pump 60.

[0145] In the present embodiment, the pump body 62 is formed in multiple parts and comprises a first pump body part 76 and a separate second pump body part 78. The pump diaphragm 64 is held between the first pump body part 76 and the second pump body part 78. The pump body parts 76 and 78 exert a clamping force on the clamping area 30 of the pump diaphragm 64. This increases the sealing effect between the first pump body part 76 and the pump diaphragm 64.

[0146] Depending on the surface area of ​​the pump diaphragm 64, the surface treatment offers different advantages. With regard to the clamping area 30, the advantage is that the tendency of the clamping area 30 to adhere to the pump body parts 76 and 78 is reduced. This facilitates residue-free replacement of the pump diaphragm 64 after its service life. With regard to the wetted area 22 of the pump diaphragm 64, the advantage is that the cleanability of the pump diaphragm 64 is improved.

[0147] In the manufacturing process shown in Figure 4, the elastomer component 18, i.e., the valve diaphragm 20, is first manufactured from the elastomer material 48. Only then is the elastomer component 18 irradiated with UV radiation. Alternatively, the elastomer material 48 can also be irradiated with UV radiation before the elastomer component 18 is manufactured. The irradiated elastomer material 48 can then be further processed in various ways.

[0148] If the surface-treated elastomer material 48 is further processed by an injection molding process, the plasticization of the elastomer material 48 means that the surface 80 of the elastomer material 48 does not necessarily form the surface 50 of the finished elastomer component 18. In particular, the injection molding process can result in a homogeneous mixing of the elastomer material 48. However, the surface 50 of the finished elastomer component 18 is nevertheless formed by the chemically modified surface 80 of the elastomer material 48, so that the advantageous properties of UV irradiation still come into play, albeit to a lesser extent.

[0149] If, on the other hand, the UV-irradiated elastomer material 48 is further processed, for example by a stamping process, the surface 80 of the elastomer material 48 also forms the surface of the finished elastomer component 18.

[0150] The surface treatment described here is not limited to the previously described embodiments such as membranes, but can be applied in a wide variety of technical fields where elastomers are used. The advantages associated with UV irradiation and chemical modification also apply to other elastomeric components. The described surface treatment reduces particle adhesion and thus abrasion, which improves performance and extends the service life of elastomeric components. In general, all elastomers that come into contact with other materials and are subject to mechanical stress can benefit from this surface treatment. This includes applications where elastomers interact with solid, liquid, or gaseous media and where wear may occur.The treated elastomer components are used in various technical fields and offer specific advantages in their respective areas of application.

[0151] In automotive engineering, elastomer components include, for example, wiper blades, radial shaft seals, O-rings, door seals, and window seals, whose outer contact surfaces interact with the vehicle's metal and / or glass surfaces. The special surface treatment of these seals reduces the adhesion of dirt and moisture, thus minimizing wear and maintaining sealing performance over a longer period. Elastomer components also include shock absorber mounts and suspension components, where the treated surface, subject to constant movement and mechanical stress, is less susceptible to wear. This results in improved driving dynamics and extended maintenance intervals.In a vehicle tire, as the elastomer component, the surface treatment of the tread enables a minimization of the adhesion of road dirt, a reduction of abrasion, and an improvement in durability and driving characteristics.

[0152] In mechanical engineering and industrial plants, elastomer components include seals or O-rings. The treated contact surface in a machine housing or pipe connection reduces friction and wear, increases efficiency, and prevents leaks. Vibration dampers or conveyor belts in industrial plants also benefit from surface treatment, as the outer surface is less susceptible to particle adhesion and abrasion is minimized, thus extending service life and improving operational efficiency.

[0153] In medical and laboratory technology, the elastomer component, as described above, includes a valve diaphragm or a pump diaphragm where the treated diaphragm surface in contact with fluid media reduces deposits and blockages, increases efficiency, and decreases maintenance requirements. A catheter or medical tubing with treated inner and outer surfaces minimizes the risk of thrombosis and infection by reducing the adhesion of blood components and microorganisms. A medical glove made of elastomer with a treated outer surface is less susceptible to contamination, thus improving hygiene and reducing the risk of infection.

[0154] Single-use components made of elastomer material, used in equipment for the medical or semiconductor industries, must be highly pure, and the process medium is usually very valuable. Simplified cleaning due to reduced particle adhesion and wettability is advantageous in these applications. Furthermore, the lower wettability allows for easier and more extensive extraction and recycling of the process medium from the system.

[0155] In electronics and electrical engineering, an elastomer component refers to a cable sheath where the treated surface prevents dust and moisture from adhering, improves electrical insulation, and prevents short circuits. A seal for an electronic housing with a treated contact surface achieves a better seal and prevents the ingress of moisture and dust. A flexible connector or keyboard component made of elastomer benefits from reduced wear and an increased service life due to less abrasion on the treated surface. In the construction industry, an elastomer component refers to a building's window or door seal, where the treated surface reduces dirt adhesion and facilitates cleaning, thus maintaining the seal's appearance and functionality.A sealing tape for joints with a treated contact surface to concrete or other building materials offers improved sealing and extended service life. A floor covering or coating made of elastomer that has undergone surface treatment is more resistant to abrasion and soiling. In the food and packaging industry, elastomer components include seals, valve diaphragms, or pump diaphragms in filling systems, where the treated surface prevents food residue from adhering, improves hygiene, and avoids cross-contamination. A conveyor belt or transport roller made of elastomer with a treated surface reduces food residue buildup, facilitates cleaning, and increases production line efficiency.In a packaging machine, an elastomeric seal or gripping element with a treated surface benefits from reduced adhesion, which increases the accuracy and speed of packaging.

[0156] In aerospace, elastomer components include seals or O-rings in aircraft doors or windows, where the treated surface provides improved sealing and reduces maintenance through less wear. Elastomeric vibration dampers or bearings in engines or landing gear benefit from surface treatment through increased resistance to extreme conditions. A treated elastomeric protective cap or cover reduces the adhesion of ice and dirt to surfaces, improving safety and functionality.

[0157] The elastomer component can also be a coated component, where the coating comprises the elastomer material, and where a coated base body of the elastomer component is free of the elastomer material. The component area made of the elastomer material is then the coating of the elastomer component.

[0158] The elastomer component can also be a semipermeable membrane. Semipermeable membranes are used in a variety of applications where the selective passage of certain molecules or ions is important. For example, the membrane can be a dialysis membrane or a reverse osmosis membrane. If the elastomer component is a semipermeable membrane, the entire membrane can be made of the elastomer material. Alternatively, only a coating of the membrane can be made of the elastomer material. This results in the previously discussed advantages regarding reduced adhesion and easier cleaning. Easier cleaning can, for example, prevent the growth of microorganisms such as bacteria on the membrane.

[0159] The elastomer component can also be a filter. For example, the filter might be intended for use in the food industry, medical technology, or automotive engineering. If the elastomer component is a filter, the entire filter can be made of the elastomer material. Alternatively, only a coating of the filter can be made of the elastomer material. This results in the previously discussed advantages regarding reduced adhesion and easier cleaning. Easier cleaning can be particularly important in medical technology and the food industry, preventing the growth of germs such as bacteria on the filter.

Claims

Patent claims 1. Method for surface treatment of an elastomer material (48), the method comprising: Providing an elastomeric material (48), in particular synthetic rubber; and Irradiating at least one surface section of a surface (80) of the elastomeric material (48) with UV radiation, whereby the surface section is chemically altered.

2. Method according to claim 1, characterized in that a UV source (54) is provided, and that the elastomer material (48) is arranged in an exposure area (52) of the UV source (54) in order to irradiate the elastomer material (48) with the UV radiation.

3. Method according to one of the preceding claims, characterized in that the UV radiation has a central wavelength of at least 150 nm and at most 350 nm.

4. Method according to one of the preceding claims, characterized in that the surface section is irradiated for such a long time that an IR spectrum of the irradiated and chemically modified surface section shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹. -1 and 1730 cm -1 exhibits, wherein the ratio of the signal area of ​​a signal arrangement of the IR spectrum at a wavenumber between 2600 cm -1 and 3000 cm -1 The ratio of the signal area of ​​the carbonyl group signal to the signal area is at most 50:1, particularly preferably at most 30:

1.

5. Method for manufacturing an elastomer component (18), the method comprising: - Surface treatment of an elastomer material (48) by a method according to any one of claims 1 to 4; and Manufacturing an elastomer component (18), wherein at least one component area of ​​the elastomer component (18) is manufactured from the surface-treated elastomer material (48).

6. Method for surface treatment of an elastomer component (18), the method comprising: 36 Providing an elastomer component (18) comprising at least one component area made of an elastomer material (48), in particular synthetic rubber; and Irradiating at least the component area with UV radiation, whereby at least one surface section of the surface (50) of the component area made from the elastomer material (48) is chemically modified.

7. Method according to the preceding claim, characterized in that a UV source (54) is provided, and that the elastomer component (18) is arranged in an exposure area (52) of the UV source (54) in order to irradiate the component area with the UV radiation.

8. Method according to one of claims 6 and 7, characterized in that the component area is irradiated with UV radiation having a central wavelength of at least 150 nm to at most 350 nm.

9. Method according to one of claims 6 to 8, characterized in that the component area is irradiated for such a long time that an IR spectrum of the irradiated and chemically modified surface section of the surface of the component area shows a carbonyl group signal at a wavenumber between 1700 cm⁻¹ -1 and 1730 cm -1 exhibits, wherein the ratio of the signal area of ​​a signal arrangement of the IR spectrum at a wavenumber between 2600 cm -1 and 3000 cm -1 The ratio of the signal area of ​​the carbonyl group signal to the signal area is at most 50:1, particularly preferably at most 30:

1.

10. Elastomeric material (48), wherein - the elastomer material (48) is chemically modified at least in sections on its surface (80), and wherein - an IR spectrum of a chemically modified surface section of the surface (80) a carbonyl group signal at a wavenumber between 1700 cm -1 and 1730 cm' 1 exhibits.

11. Elastomeric material (48) according to the preceding claim, characterized in that the elastomeric material (48) is a synthetic rubber, in particular an ethylene propylene diene monomer rubber (EPDM), a styrene butadiene rubber (SBR), an acrylonitrile butadiene rubber (NBR) or a fluororubber (FKM), or a polysiloxane.

12. Elastomeric material (48) according to one of claims 10 and 11, characterized in that the elastomeric material (48) is fluorine-free, in particular a fluorine-free synthetic rubber.

13. Elastomeric material (48) according to one of claims 10 to 12, characterized in that the surface (80) of the elastomeric material (48) has at least one chemically unaltered surface section, wherein an IR spectrum of the chemically unaltered surface section is free of the carbonyl group signal.

14. Elastomeric material (48) according to one of claims 10 to 13, characterized in that the IR spectrum of the chemically modified surface section exhibits a signal arrangement at a wavenumber between 2600 cm⁻¹ -1 and 3000 cm -1 having a ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal of at most 50:1, particularly preferably at most 30:

1.

15. Elastomeric material (48) according to one of claims 10 to 14, characterized in that an IR spectrum of a core region of the elastomeric material (48) is free of the carbonyl group signal.

16. Elastomeric material (48) according to one of claims 10 to 14, characterized in that an IR spectrum of a core region of the elastomeric material (48) exhibits the carbonyl group signal.

17. Elastomeric material (48) according to one of claims 10 to 16, characterized in that the IR spectrum of the chemically modified surface section at a wavenumber between 3200 cm' 1 and 3650 cm' 1 is free of a hydroxyl group signal, or that the IR spectrum of the chemically modified surface section at a wavenumber between 3200 cm' 1 and 3650 cm' 1 a hydroxyl group signal, wherein the ratio of the signal area of ​​the hydroxyl group signal to the signal area of ​​the carbonyl group signal is at most 3:10, preferably at most 1:

10.

18. Elastomeric material (48) according to one of claims 10 to 17, characterized in that the chemically modified surface section has a coefficient of sliding friction (pG ) of at most 1.

30.

19. Elastomeric material (48) according to one of claims 10 to 18, characterized in that the elastomeric material (48) has at least one chemically unmodified surface section, and that the ratio of the coefficient of sliding friction of the chemically modified surface section to the coefficient of sliding friction of the chemically unmodified surface section is at most 0.75:1, particularly preferably at most 0.65:

1.

20. Elastomeric material (48) according to one of claims 10 to 19, characterized in that the elastomeric material (48) is plate-shaped, strip-shaped, film-shaped, bulk-shaped or granular-shaped.

21. Elastomeric component (18), comprising: - at least one component area made of an elastomer material (48), wherein - the component area made from the elastomer material (48) is chemically modified at least on its surface (50) at least section by section, and wherein - an IR spectrum of a chemically modified surface section of the surface (50) of the component area a carbonyl group signal at a wavenumber between 1700 cm -1 and 1730 cm -1 exhibits.

22. Elastomeric component (18) according to claim 21, characterized in that the elastomeric material (48) is a synthetic rubber, in particular an ethylene propylene diene rubber (EPDM), a styrene butadiene rubber (SBR), an acrylonitrile butadiene rubber (NBR) or a fluororubber (FKM), or a polysiloxane.

23. Elastomeric component (18) according to one of claims 21 and 22, characterized in that the elastomeric material (48) is fluorine-free, in particular a fluorine-free synthetic rubber.

24. Elastomeric component (18) according to one of claims 21 to 23, characterized in that the surface (50) of the component area made from the elastomeric material (48) has at least one chemically unaltered surface section, wherein an IR spectrum of the chemically unaltered surface section is free of the carbonyl group signal.

25. Elastomeric component (18) according to one of claims 21 to 24, characterized in that the IR spectrum of the chemically modified surface section exhibits a Signal arrangement at a wavenumber between 2600 cm -1 and 3000 cm -1 having a ratio of the signal area of ​​the signal arrangement to the signal area of ​​the carbonyl group signal of at most 50:1, particularly preferably at most 30:

1.

26. Elastomer component (18) according to one of claims 21 to 25, characterized in that an IR spectrum of a core region of the component area made from the elastomer material (48) is free of the carbonyl group signal.

27. Elastomer component (18) according to one of claims 21 to 25, characterized in that an IR spectrum of a core region of the component area made from the elastomer material (48) exhibits the carbonyl group signal.

28. Elastomeric component (18) according to one of claims 21 to 27, characterized in that the IR spectrum of the chemically modified surface section at a wavenumber between 3200 cm⁻¹ -1 and 3650 cm -1 is free of a hydroxyl group signal, or that the IR spectrum of the chemically modified surface section at a wavenumber between 3200 cm⁻¹ -1 and 3650 cm -1a hydroxyl group signal, wherein the ratio of the signal area of ​​the hydroxyl group signal to the signal area of ​​the carbonyl group signal is at most 3:10, preferably at most 1:

10.

29. Elastomeric component (18) according to one of claims 21 to 28, characterized in that the chemically modified surface section has a coefficient of sliding friction (PG) of at most 1.

30.

30. Elastomeric component (18) according to one of claims 21 to 29, characterized in that the component area made from the elastomeric material (48) has at least one chemically unmodified surface section, and that the ratio of the coefficient of sliding friction of the chemically modified surface section and the coefficient of sliding friction of the chemically unmodified surface section is at most 0.75:1, particularly preferably at most 0.65:

1.

31. Elastomeric component (18) according to one of claims 21 to 30, characterized in that the elastomeric component (18) is planar, annular, tubular or cavernous.

32. Elastomeric component (18) according to one of claims 21 to 31, characterized in that the elastomeric component (18) is a membrane (20, 64), in particular a Valve diaphragm (20) for a diaphragm valve (10) or a pump diaphragm (64) for a diaphragm pump (60).

33. Elastomer component (18) according to the preceding claim, characterized in that the elastomer component (18) designed as a membrane (20, 64) has a media-contacting area (22), wherein the media-contacting area (22) is made of the elastomer material (48) and is chemically modified at least section by section on its surface (50).

34. Elastomer component (18) according to one of claims 32 and 33, characterized in that the elastomer component (18) designed as a membrane (20, 64) has a clamping area (30) which can be clamped between two housing parts, wherein the clamping area (30) is made of the elastomer material (48) and is chemically modified at least in sections on its surface (50).

35. Elastomeric component (18) according to one of claims 21 to 31, characterized in that the elastomeric component (18) is a sealing element, in particular an O-ring.

36. Diaphragm valve (10), comprising: - an elastomer component (18) designed as a valve diaphragm (20) according to one of claims 32 to 34; and - a valve body (12) with an opening (16) leading to a stationary valve seat (14) and closed by the valve diaphragm (20), wherein the valve body (12) and the valve diaphragm (20) together define a process fluid channel (28), and wherein the valve diaphragm (20) is movable between an open position in which a process fluid flow is allowed through the process fluid channel (28) via the stationary valve seat (14) and a closed position in which the process fluid flow is blocked by the valve diaphragm (20) being in contact with the stationary valve seat (14).

37. Diaphragm pump (60), comprising: - an elastomer component (18) designed as a pump diaphragm (64) according to one of claims 32 to 34; and - a pump body (62), wherein the pump body (62) and the pump diaphragm (64) together define a pressure chamber (66), wherein the pump body (62) has a fluid inlet (68) fluidically connected to the pressure chamber (66) with an inlet valve (72) and a fluid outlet (70) fluidically connected to the pressure chamber (66) with an outlet valve (74), and wherein the volume of the pressure chamber (66) can be increased or decreased by moving the pump diaphragm (64). 42

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