Sealing gasket for electrolyzer and filter press electrolyzer for producing hydrogen by electrolysis of water

Abstract

The present application provides a sealing gasket for an electrolyzer and a filter press electrolyzer for producing hydrogen by electrolysis of water, wherein the sealing gasket for the electrolyzer is used for sealing between the end pressure plate and the end plate, and comprises: a gasket body; an opening, arranged inside the gasket body; a flow channel hole, arranged on the gasket body; a magnetic attraction part, located outside the flow channel hole and arranged inside the gasket body, wherein the magnetic attraction part comprises one or more magnets. When in use, when the sealing gasket for the electrolyzer of the present application is subjected to a large shear force, it will bend toward the side with a smaller flow channel, and the magnetic attraction part will rely on its magnetic attraction to tightly adsorb on the inner surface of the flow channel hole of the end pressure plate, thereby effectively preventing the gasket from being irregularly deformed by shear and blocking the gas-liquid flow channel; at the same time, even if the shear force is so large as to destroy the sealing gasket for the electrolyzer, the separated part of the gasket can still be adsorbed on the inner surface of the flow channel hole of the end pressure plate to prevent blocking the flow channel and affecting the gas-liquid flow.

Description

Technical Field

[0001] The present application belongs to the field of hydrogen production by alkaline water electrolysis, and specifically relates to a sealing gasket for an electrolyzer and a filter press electrolyzer for hydrogen production by water electrolysis. Background Art

[0002] The existing filter-press electrolyzer for producing hydrogen by electrolysis of water generally includes end pressure plates arranged at both ends, two end plates (anode plate and cathode plate, respectively) arranged inside the end pressure plates, and multiple electrolysis chambers (formed by bipolar plates and gaskets and diaphragms arranged between the bipolar plates) arranged between the two end plates.

[0003] Currently, if Figure 1 , Figure 2 As shown, a rubber or PTFE flat gasket (gasket A1) is used to seal between the end pressure plate (existing end pressure plate A3) and the end electrode plate (existing end electrode plate A4), and the flow channel hole positions of the end pressure plate and the end electrode plate overlap, but because the end pressure plate near this position needs to merge multiple alkali liquid channels into one, the flow channel hole sizes of the end pressure plate and the end electrode plate are quite different (generally, the flow channel hole of the end pressure plate is smaller than the flow channel hole of the end electrode plate). During the installation and operation of the equipment, the shear force on the flow channel hole of the gasket is relatively large, resulting in large irregular deformation or even damage of the gasket, thereby affecting the gas-liquid flow rate, and there is also a risk of gasket breakage and blocking the flow channel. Summary of the invention

[0004] In order to solve the problems in the prior art, the present application provides a sealing gasket for an electrolyzer, which is used for sealing between the end pressure plate and the end plate in a filter press electrolyzer for producing hydrogen by electrolysis of water, and provides a filter press electrolyzer for producing hydrogen by electrolysis of water equipped with the sealing gasket for an electrolyzer. The technical solution of the present application is as follows:

[0005] 1. A sealing gasket for an electrolytic cell, used for sealing between the end pressure plate and the end plate in a filter press electrolytic cell for producing hydrogen by electrolysis of water, comprising:

[0006] Gasket body;

[0007] an opening disposed inside the gasket body;

[0008] A flow channel hole, which is arranged on the gasket body;

[0009] The magnetic attraction portion is located outside the flow channel hole and is arranged in the gasket body, wherein the magnetic attraction portion includes more than one magnet.

[0010] 2. The sealing gasket for an electrolytic cell as described in item 1, wherein the gasket body is made of rubber;

[0011] Preferably, the rubber is selected from one or a combination of two or more of ethylene-propylene rubber, EVA rubber, natural rubber, chloroprene rubber, ethylene-vinyl acetate rubber, chlorinated polyethylene rubber, polyacrylate rubber, ethylene acrylate rubber, nitrile rubber, and fluororubber;

[0012] More preferably, the rubber further contains one or more auxiliary agents selected from the group consisting of a reinforcing filler, a plasticizer, a vulcanizer, and an accelerator.

[0013] 3. The sealing gasket for an electrolytic cell as described in item 1, wherein the gasket body is made of plastic;

[0014] Preferably, the plastic is selected from one or a combination of two or more of PTFE, PPS, and PEEK;

[0015] More preferably, the plastic also contains a modifier and carbon fiber.

[0016] 4. In the sealing gasket for an electrolytic cell as described in item 1, the magnetic attraction portion comprises two or more magnets; the two or more magnets are continuously or intermittently arranged in the gasket body.

[0017] 5. In the sealing gasket for an electrolytic cell as described in item 4, the magnet is bonded to the gasket body by an adhesive; preferably, the adhesive is an isocyanate system adhesive or a Lekna system adhesive.

[0018] 6. The sealing gasket for an electrolytic cell as described in item 1 further includes a bending realization portion, which is arranged on the gasket body and is located on the opposite side of the flow channel hole side of the magnetic attraction portion, so as to bend the magnetic attraction portion toward one side of the gasket body.

[0019] 7. In the sealing gasket for an electrolytic cell as described in item 6, the bending realization portion is a cavity arranged in the gasket body.

[0020] 8. In the sealing gasket for an electrolytic cell as described in item 7, the height of the cavity is greater than half of the thickness of the gasket body; and / or, in the thickness direction of the gasket body, the magnetic attraction portion is arranged toward one side of the gasket body, and the cavity is arranged toward the other side of the gasket body; and / or, in the thickness direction of the gasket body, the distance between the magnetic attraction portion and one side of the gasket body is 0.3 mm to 20 mm.

[0021] 9. In the sealing gasket for an electrolytic cell as described in item 6, the bending realization portion is a groove arranged on the outer surface of the gasket body.

[0022] 10. In the sealing gasket for an electrolytic cell as described in item 9, the depth of the groove is greater than half of the thickness of the gasket body; and / or, in the thickness direction of the gasket body, the magnetic attraction portion is arranged toward one side of the gasket body, and the groove is arranged on the other side of the gasket body; and / or, in the thickness direction of the gasket body, the distance between the magnetic attraction portion and the other side of the gasket body is 0.3 mm to 20 mm.

[0023] 11. A filter press electrolyzer for producing hydrogen by electrolysis of water, comprising the sealing gasket for the electrolyzer as described in any one of items 1 to 10.

[0024] The present application provides a sealing gasket for an electrolytic cell and a filter press electrolytic cell for producing hydrogen by electrolysis of water. During use, when the sealing gasket for the electrolytic cell of the present application is subjected to a large shear force, it will bend toward the side with a smaller flow channel, and the magnetic attraction portion will rely on its magnetic attraction to tightly adsorb on the inner surface of the flow channel hole of the end pressure plate, thereby effectively preventing the gasket from being irregularly deformed by shear and blocking the gas-liquid flow channel; at the same time, even if the shear force is so large as to destroy the sealing gasket for the electrolytic cell, due to the action of the magnetic attraction, the separated part of the gasket can still be adsorbed on the inner surface of the flow channel hole of the end pressure plate to prevent the flow channel from being blocked and affecting the gas-liquid flow rate.

[0025] The above description is only an overview of the technical solution of the present application. In order to make the technical means of the present application clearer and to enable those skilled in the art to implement it according to the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : Schematic diagram of gasket structure in the prior art;

[0027] Figure 2 : Schematic diagram of the structure near the flow channel hole after the gasket is installed in the prior art;

[0028] Figure 3 : A schematic diagram of the structure of a sealing gasket for an electrolytic cell in one embodiment;

[0029] Figure 4 :When the bending realization part is a cavity Figure 3 A-A' section structure schematic diagram;

[0030] Figure 5 :When the bending realization part is a groove Figure 3 A-A' cross-section structure schematic diagram;

[0031] Figure 6 : A schematic diagram of the structure near the flow channel hole after the sealing gasket is installed for the electrolytic cell in one embodiment.

[0032] Description of reference numerals:

[0033] A1, gasket; A2, flow channel hole of gasket; A3, existing end pressure plate; A4, existing end plate;

[0034] 1. Gasket body; 2. Opening; 3. Flow channel hole; 4. Magnetic attraction part; 5. Bending realization part; 5-1. Cavity; 5-2. Groove; 6. End pressure plate; 7. End plate. DETAILED DESCRIPTION

[0035] The following embodiments of the present application are only used to illustrate the specific embodiments of the present application, and these embodiments cannot be understood as limiting the present application. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present application are deemed to be equivalent replacement methods and fall within the scope of protection of the present application.

[0036] In one embodiment, Figure 3 to Figure 6 As shown, a sealing gasket for an electrolyzer is provided, which is used for sealing between the end pressure plate and the end electrode plate in a filter press electrolyzer for producing hydrogen by electrolysis of water, and comprises: a gasket body 1; an opening 2, which is arranged inside the gasket body 1; a flow channel hole 3, which is arranged on the gasket body 1; and a magnetic attraction portion 4, which is located outside the flow channel hole 3 and is arranged inside the gasket body 1.

[0037] In this embodiment and the following implementation modes, the flow channel hole of the end pressure plate 6 used is smaller than the flow channel hole of the end electrode plate 7 (consistent with the conventional design of the prior art).

[0038] For the convenience of description, the side of the gasket body 1 close to the end pressure plate 6 is called the end pressure plate side, and the side close to the end electrode plate 7 is called the end electrode plate side. The installation method of the structure near the flow channel hole 3 of the sealing gasket for the electrolytic cell of this embodiment is as follows: Figure 6 shown.

[0039] The gasket body 1 can be made of rubber. The rubber is selected from one or more of ethylene-propylene rubber, EVA rubber, natural rubber, chloroprene rubber, ethylene-vinyl acetate rubber, chlorinated polyethylene rubber, polyacrylate rubber, ethylene acrylate rubber, nitrile rubber, and fluororubber; preferably one or more of ethylene-propylene rubber, fluororubber, and EVA rubber. Preferably, the rubber also contains one or more of reinforcing fillers (such as carbon black), plasticizers, vulcanizers, and accelerators.

[0040] The gasket body 1 can also be made of plastic. The plastic is selected from one or a combination of two or more of PTFE, PPS, and PEEK. PTFE is preferred. Preferably, the plastic also contains a modifier and carbon fiber.

[0041] The gasket body 1 is made of the above-mentioned rubber or plastic, which has excellent heat resistance, and has extremely good rigidity, strength and fatigue resistance at high temperatures. It also has excellent corrosion resistance and can resist various chemical erosions such as acids, alkalis, and chlorocarbons, fully meeting the working requirements of alkaline hydrogen production electrolyzers.

[0042] Regarding the shape of the gasket body 1, it can be an annular or polygonal (such as a triangle, rectangle, etc.) frame as required, preferably a rectangular or circular frame.

[0043] Regarding the size of the gasket body 1, its width is 0.1mm to 500mm ( Figure 4 or Figure 5 The distance from left to right of the cross section shown in ), thickness ( Figure 4 or Figure 5 The distance from top to bottom of the cross section shown in FIG. 2 is 0.1 mm to 300 mm, and the equivalent inner diameter (ie, the diameter of the equivalent circular area of ​​the opening 2) is 0.1 mm to 5000 mm.

[0044] As for the flow channel hole 3, the shape is circular, waist-shaped or other shapes, and the area is 1 mm2 to 100000 mm2.

[0045] Regarding the magnetic attraction part 4, the present application has no special restrictions, as long as it can be adsorbed on the inner surface of the flow channel of the end pressure plate or the end pole plate by magnetic attraction. Specifically, the magnetic attraction part can be listed as a magnet or a polymer material doped with a magnetic substance (such as rubber). In addition, the magnetic attraction part can be divided into two or more sections, and the magnetic attraction parts of more than two sections are continuously or intermittently arranged (the magnetic attraction parts are hollow or filled with soft materials such as rubber) in the gasket body 1. In this embodiment, the magnetic attraction part is preferably two or more sections (such as 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45 or 50) of magnets are continuously or intermittently arranged in the gasket body 1. More specifically, the magnet is bonded to the gasket body 1 by an adhesive. The adhesive is preferably a methyl methacrylate adhesive (such as rubber adhesive RH, rubber adhesive GLR801) or a Lekna adhesive (such as JQ-1, JQ-6), both of which are suitable for bonding the magnetic attraction part 4 (such as a magnet) to the gasket. Figure 4 or Figure 5 The vertical direction in the middle is 0.5~15mm, and the width is ( Figure 4 or Figure 5 The left and right directions in the middle are 0.5 to 50 mm, the total length is 1 to 500 mm, and the distance from the flow channel hole 3 is 0.5 to 50 mm.

[0046] The sealing gasket for the electrolytic cell in this embodiment is used to seal between the end pressure plate and the end electrode plate of the hydrogen production electrolytic cell when electrolyzing water to produce hydrogen. When it is subjected to a large shear force, such as Figure 6 As shown, it will bend toward the side with smaller flow channel (end pressure plate side), at this time, the magnetic attraction portion 4 will rely on its magnetic attraction to tightly adsorb on the inner surface of the end pressure plate flow channel hole, thus compared with the prior art (such as Figure 2 As shown in the figure), it can effectively prevent the irregular deformation of the gasket due to shearing from blocking the gas-liquid flow channel; at the same time, even if the shear force is so large that the sealing gasket of the electrolytic cell is destroyed, due to the effect of magnetic attraction, the separated part of the gasket can still be adsorbed on the inner surface of the flow channel hole of the end pressure plate to prevent the flow channel from being blocked and affecting the gas-liquid flow.

[0047] In one embodiment, if Figures 3 to 6 As shown, the sealing gasket for the electrolytic cell also includes a bending implementation portion 5, which is arranged on the gasket body 1 and is located on the outer side of the magnetic attraction portion 4 (i.e., the opposite side of the flow channel hole 3 of the magnetic attraction portion 4) to facilitate the magnetic attraction portion 4 to bend toward one side of the gasket body (the end pressure plate side).

[0048] Then, by providing the bending realization part 5, the bending of the magnetic attraction part 4 can be facilitated (such as Figure 6 (in the middle, it is bent toward the end pressure plate side).

[0049] In one embodiment, if Figure 4 , Figure 6 As shown, the bending realization part 5 is a cavity 5-1 arranged in the gasket body 1. Preferably, the cavity 5-1 is arranged around the flow channel hole 3 and is located on the outside of the magnetic attraction part 4. Thereby, the material between the cavity 5-1 and the end plate side of the gasket body 1 is thinner. When a large shear force is received, the thinner part of the material breaks, so that the magnetic attraction part 4 is easier to bend toward the end pressure plate side and adsorbed in the flow channel of the end pressure plate. At the same time, especially when the gasket body 1 is made of a softer material (such as the above-mentioned rubber material), the thinner part of the material (0.1 to 50 mm) can prevent the gasket body 1 from being deformed during transportation and installation. When the shear force is small, it can also provide a certain support effect to improve the shear resistance of the sealing gasket for the electrolytic cell. Preferably, the height of the cavity (i.e. Figure 4 The distance in the vertical direction) is greater than one-half of the thickness of the gasket body, more preferably two-thirds, and the specific height is 0.3-20 mm. Further preferably, the width of the cavity 5-1 (i.e. Figure 4 The distance in the left and right directions is 0.5 to 50 mm, and the total length of the cavity 5-1 is 1 to 500 mm.

[0050] Preferably, in the thickness direction of the gasket body, the magnetic attraction part 4 is arranged toward one side of the gasket body (i.e., the end pressure plate side), so that when the magnetic attraction part is adsorbed into the flow channel hole of the end pressure plate, the distance between the two is closer, thereby increasing the adsorption force. Preferably, in the thickness direction of the gasket body, the distance t between the magnetic attraction part 4 and one side of the gasket body 1 (i.e., the end pressure plate side) is 0.3 to 20 mm, thereby ensuring that the magnetic attraction part 4 can be firmly adsorbed on the inner wall of the end pressure plate flow channel.

[0051] Preferably, the cavity 5-1 is arranged toward the other side (end plate side) of the gasket body, so that the material between the cavity 5-1 and the end plate side is thinner, which is conducive to the breaking of the thinner part of the material, thereby reducing the bending force of the magnetic attraction part 4 when bending, which is more conducive to the bending of the magnetic attraction part 4.

[0052] In one embodiment, if Figure 5 , Figure 6 As shown, the bending realization part 5 can also be a groove 5-2 arranged on the outer surface of the gasket body 1. Preferably, the groove 5-2 is arranged around the flow channel hole 3 and is located on the outside of the magnetic attraction part 4. This is conducive to the magnetic attraction part 4 bending to one side of the gasket body 1 (the end pressure plate side), especially when the gasket body 1 is made of a harder material (such as the above-mentioned plastic), the effect is more obvious. Preferably, the depth of the groove 5-2 (i.e. Figure 5 The distance in the vertical direction) is greater than one-half of the thickness of the gasket body 1, more preferably two-thirds, and the specific height range is 0.3 to 20 mm. Further preferably, the width of the groove 5-2 (i.e. Figure 5 The distance in the left and right directions is 0.5 to 50 mm, and the total length of the groove 5-2 is 1 to 500 mm.

[0053] Preferably, in the thickness direction of the gasket body, the magnetic attraction part 4 is arranged toward one side of the gasket body (i.e., the end pressure plate side), so that when the magnetic attraction part is adsorbed into the flow channel hole of the end pressure plate, the distance between the two is closer, thereby increasing the adsorption force. Preferably, in the thickness direction of the gasket body, the distance t between the magnetic attraction part 4 and one side of the gasket body 1 (the end pressure plate side) is 0.3 to 20 mm, thereby ensuring that the magnetic attraction part 4 can be firmly adsorbed on the inner wall of the end pressure plate flow channel.

[0054] Preferably, the groove is arranged on the other side (end plate side) of the gasket body, so as to reduce the bending force of the magnetic attraction part 4 when it is bent, which is more conducive to the bending of the magnetic attraction part 4.

[0055] The above sealing gasket for electrolytic cell can be prepared by existing methods, which are as follows:

[0056] First, the magnets need to be processed by sandblasting or solvent washing to remove oil and dirt, and then sprayed with adhesive after the processing is completed.

[0057] When the gasket body is made of rubber, the rubber formula includes raw rubber, reinforcing filler (such as carbon black), plasticizer, vulcanizer, accelerator, etc., which is made into mixed rubber through rubber refining. Finally, the magnets that have been properly sprayed and placed are placed in a mold and co-vulcanized with the rubber vulcanizing equipment.

[0058] When the gasket body is made of plastic materials such as modified PTFE, the formula includes plastic powder, modifier (such as SiO2), carbon fiber, etc. The mixed plastic components and the treated magnets are placed in a mold for molding, sintering and other processes.

[0059] Based on the sealing gasket for the electrolyzer of the present application introduced in the above embodiment, those skilled in the art know that it can be used to replace the gasket between the end pressure plate and the end electrode plate of the filter press electrolyzer for producing hydrogen by electrolysis of water in the prior art (such as introduced in the background technology), thereby obtaining a filter press electrolyzer for producing hydrogen by electrolysis of water provided with the sealing gasket for the electrolyzer.

[0060] Although the embodiments of the present application are described above, the present application is not limited to the above specific embodiments and application fields, and the above specific embodiments are merely illustrative and instructive, rather than restrictive. A person of ordinary skill in the art can make many forms under the guidance of this specification and without departing from the scope of protection of the claims of the present application, all of which belong to the scope of protection claimed in the present application.

Claims

1. A sealing gasket for an electrolyzer, used for sealing between the end pressure plate and the end electrode plate in a filter press electrolyzer for producing hydrogen by electrolysis of water, characterized in that: include: Gasket body; an opening disposed inside the gasket body; A flow channel hole, which is arranged on the gasket body; A magnetic attraction portion, which is located outside the flow channel hole and is disposed in the gasket body, wherein the magnetic attraction portion includes more than one magnet; The sealing gasket for the electrolytic cell further comprises a bending realization portion, which is arranged on the gasket body and located on the opposite side of the flow channel hole side of the magnetic attraction portion, so as to be used for the magnetic attraction portion to bend toward one side of the gasket body; The bending realization portion is a cavity arranged in the gasket body; Wherein, the height of the cavity is greater than half of the thickness of the gasket body; and / or, in the thickness direction of the gasket body, the magnetic attraction part is arranged toward one side of the gasket body, and the cavity is arranged toward the other side of the gasket body; and / or, in the thickness direction of the gasket body, the distance between the magnetic attraction part and one side of the gasket body is 0.3mm to 20mm.

2. The sealing gasket for an electrolytic cell according to claim 1, characterized in that: The gasket body is made of rubber.

3. The sealing gasket for an electrolytic cell according to claim 2, characterized in that: The rubber is selected from one or a combination of two or more of ethylene-propylene rubber, EVA rubber, natural rubber, chloroprene rubber, ethylene-vinyl acetate rubber, chlorinated polyethylene rubber, polyacrylate rubber, ethylene acrylate rubber, nitrile rubber, and fluororubber.

4. The sealing gasket for an electrolytic cell according to claim 3, characterized in that: The rubber also contains one or more auxiliary agents selected from the group consisting of a reinforcing filler, a plasticizer, a vulcanizer and an accelerator.

5. The sealing gasket for an electrolytic cell according to claim 1, characterized in that: The gasket body is made of plastic.

6. The sealing gasket for an electrolytic cell according to claim 5, characterized in that: The plastic is selected from one or a combination of two or more of PTFE, PPS and PEEK.

7. The sealing gasket for an electrolytic cell according to claim 6, characterized in that: The plastic also contains a modifier and carbon fiber.

8. The sealing gasket for an electrolytic cell according to claim 1, characterized in that: The magnetic attraction portion includes more than two magnets; Two or more magnets are arranged in the gasket body continuously or at intervals.

9. The sealing gasket for an electrolytic cell according to claim 8, characterized in that: The magnet is bonded to the gasket body by an adhesive.

10. The sealing gasket for an electrolytic cell according to claim 9, characterized in that: The adhesive is a meta-acetic acid white system adhesive or a Lekna system adhesive.

11. A sealing gasket for an electrolytic cell, used for sealing between the end pressure plate and the end electrode plate in a filter press electrolytic cell for producing hydrogen by electrolysis of water, characterized in that: include: Gasket body; an opening disposed inside the gasket body; A flow channel hole, which is arranged on the gasket body; A magnetic attraction portion, which is located outside the flow channel hole and is disposed in the gasket body, wherein the magnetic attraction portion includes more than one magnet; The sealing gasket for the electrolytic cell further comprises a bending realization portion, which is arranged on the gasket body and located on the opposite side of the flow channel hole side of the magnetic attraction portion, so as to be used for the magnetic attraction portion to bend toward one side of the gasket body; The bending realization portion is a groove arranged on the outer surface of the gasket body; Wherein, the depth of the groove is greater than half of the thickness of the gasket body; and / or, in the thickness direction of the gasket body, the magnetic attraction part is arranged toward one side of the gasket body, and the groove is arranged on the other side of the gasket body; and / or, in the thickness direction of the gasket body, the distance between the magnetic attraction part and the other side of the gasket body is 0.3mm to 20mm.

12. The sealing gasket for an electrolytic cell according to claim 11, characterized in that: The gasket body is made of rubber.

13. The sealing gasket for an electrolytic cell according to claim 12, characterized in that: The rubber is selected from one or a combination of two or more of ethylene-propylene rubber, EVA rubber, natural rubber, chloroprene rubber, ethylene-vinyl acetate rubber, chlorinated polyethylene rubber, polyacrylate rubber, ethylene acrylate rubber, nitrile rubber, and fluororubber.

14. The sealing gasket for an electrolytic cell according to claim 13, characterized in that: The rubber also contains one or more auxiliary agents selected from the group consisting of a reinforcing filler, a plasticizer, a vulcanizer and an accelerator.

15. The sealing gasket for an electrolytic cell according to claim 11, characterized in that: The gasket body is made of plastic.

16. The sealing gasket for an electrolytic cell according to claim 15, characterized in that: The plastic is selected from one or a combination of two or more of PTFE, PPS and PEEK.

17. The sealing gasket for an electrolytic cell according to claim 16, characterized in that: The plastic also contains a modifier and carbon fiber.

18. The sealing gasket for an electrolytic cell according to claim 11, characterized in that: The magnetic attraction portion includes more than two magnets; Two or more magnets are arranged in the gasket body continuously or at intervals.

19. The sealing gasket for an electrolytic cell according to claim 18, characterized in that: The magnet is bonded to the gasket body by an adhesive.

20. The sealing gasket for an electrolytic cell according to claim 19, characterized in that: The adhesive is a meta-acetic acid white system adhesive or a Lekna system adhesive.

21. A filter press electrolyzer for producing hydrogen by electrolysis of water, characterized in that: A sealing gasket for an electrolytic cell comprising the sealing gasket according to any one of claims 1 to 20.

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