Sealing gasket, preparation method thereof and electrolytic bath

Abstract

The invention provides a sealing gasket and an electrolytic bath, and the sealing gasket comprises a gasket body which is provided with a first surface and a second surface which are opposite to each other; the first sealing part comprises a plurality of first convex rings which sequentially surround the first surface and are convexly arranged on the first surface, and a first groove is formed in the position, between every two adjacent first convex rings, of the first surface in a concave mode; and the second sealing part comprises a plurality of second convex rings which sequentially surround the second surface and are convexly arranged on the second surface, and a second groove is formed in the position, between every two adjacent second convex rings, of the second surface in a concave mode. The first grooves are formed between every two adjacent first convex rings, the second grooves are formed between every two adjacent second convex rings, when the first convex rings and the second convex rings elastically deform, the sealing gasket can be better attached to the surfaces of components on the two sides of the sealing gasket, and therefore the sealing effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing, and particularly relates to a sealing gasket, a preparation method thereof, and an electrolytic cell. Background Art

[0002] As a new green hydrogen manufacturing technology, the anion exchange membrane (AEM) electrolytic water hydrogen production technology has great development potential. The electrolytic cell is the core equipment in the hydrogen production technology, and the sealing gasket, as the main component for sealing the electrolytic cell, largely determines the sealing performance and insulation of the electrolytic cell compartments, directly affecting the safety and reliability of the entire electrolytic water hydrogen production system.

[0003] In related technologies, the commonly used material for the sealing gasket of the electrolytic cell is polytetrafluoroethylene (PTFE) and its modified materials. PTFE is prone to creep phenomenon, which has an adverse effect on the sealing performance of the electrolytic cell. Summary of the Invention

[0004] Embodiments of the present invention provide a sealing gasket, a preparation method thereof, and an electrolytic cell, which can improve the technical problem of poor sealing performance of the sealing gasket for the electrolytic cell.

[0005] In a first aspect, embodiments of the present invention provide a sealing gasket, which includes:

[0006] A gasket body having opposite first and second surfaces;

[0007] A first sealing portion, the first sealing portion includes a plurality of first convex rings that are sequentially surrounded and protrude on the first surface. Between adjacent two of the first convex rings, the first surface is recessed to form a first groove;

[0008] A second sealing portion, the second sealing portion includes a plurality of second convex rings that are sequentially surrounded and protrude on the second surface. Between adjacent two of the second convex rings, the second surface is recessed to form a second groove.

[0009] In an embodiment, the first convex ring corresponds to the second groove, and / or the second convex ring corresponds to the first groove.

[0010] In an embodiment, the cross-sectional shape of the first convex ring is triangular, semi-circular, rectangular, trapezoidal or arcuate; and / or

[0011] The cross-sectional shape of the second convex ring is triangular, semi-circular, rectangular, trapezoidal or arcuate; and / or

[0012] The first groove is a triangular groove, semi-circular groove, rectangular groove, trapezoidal groove or arcuate groove; and / or

[0013] The second groove is a triangular groove, a semi-circular groove, a rectangular groove, a trapezoidal groove or a bow-shaped groove.

[0014] In one embodiment, the shape of the cross-section of the first groove is the same as the shape of the cross-section of the second convex ring; and / or

[0015] The cross-sectional area of the first groove is smaller than the cross-sectional area of the second convex ring; and / or

[0016] The shape of the cross-section of the second groove is the same as the shape of the cross-section of the first convex ring; and / or

[0017] The cross-sectional area of the second groove is smaller than the cross-sectional area of the first convex ring.

[0018] In one embodiment, the shape and size of the cross-section of the first convex ring are the same as the shape and size of the cross-section of the second convex ring.

[0019] In one embodiment, the thickness of the gasket body is 0.5 mm - 2 mm;

[0020] The width of the first convex ring is 0.5 mm - 2 mm, and the height of the first convex ring is 0.5 mm - 2 mm; and / or

[0021] The width of the second convex ring is 0.5 mm - 2 mm, and the height of the second convex ring is 0.5 mm - 2 mm; and / or

[0022] The width of the first groove is 0.1 mm smaller than the width of the second convex ring, and the depth of the first groove is 0.1 mm smaller than the height of the second convex ring; and / or

[0023] The width of the second groove is 0.1 mm smaller than the width of the first convex ring, and the depth of the second groove is 0.1 mm smaller than the height of the first convex ring.

[0024] In one embodiment, the spacing between two adjacent first convex rings is 2 mm - 5 mm; and / or

[0025] The spacing between two adjacent second convex rings is 2 mm - 5 mm; and / or

[0026] The spacing between two adjacent first grooves is 2 mm - 5 mm; and / or

[0027] The spacing between two adjacent second grooves is 2 mm - 5 mm.

[0028] In one embodiment, a plurality of the first convex rings are arranged at equal intervals, the first groove is arranged in the middle of two adjacent first convex rings, and the first groove and the first convex ring are arranged at intervals; and / or

[0029] A plurality of the second convex rings are arranged at equal intervals, the second groove is arranged in the middle of two adjacent second convex rings, and the second groove and the second convex ring are arranged at intervals.

[0030] In one embodiment, the gasket body is annular, the center lines of the first sealing portion and the second sealing portion are collinear with the center line of the gasket body, the distance between the first sealing portion and the edge of the gasket body is 5 mm - 10 mm, and the distance between the second sealing portion and the edge of the gasket body is 5 mm - 10 mm.

[0031] In one embodiment, the sealing gasket is further provided with a flow channel hole penetrating through the gasket body, the first sealing portion and the second sealing portion, and the edge of the flow channel hole is arranged in the regions where the first sealing portion and the second sealing portion are located.

[0032] In one embodiment, the material of the sealing gasket includes thermoplastic dynamically vulcanized rubber, the continuous phase of the thermoplastic dynamically vulcanized rubber is polypropylene, the dispersed phase of the thermoplastic dynamically vulcanized rubber is ethylene propylene diene monomer rubber, and the mass of the ethylene propylene diene monomer rubber accounts for 40% - 70% of the sum of the mass of the ethylene propylene diene monomer rubber and the polypropylene.

[0033] In a second aspect, an embodiment of the present invention provides a method for preparing a sealing gasket, including:

[0034] Providing thermoplastic dynamically vulcanized rubber, and performing a molding process on the thermoplastic vulcanized rubber to obtain a sealing gasket;

[0035] Wherein, the continuous phase of the thermoplastic dynamically vulcanized rubber is polypropylene, the dispersed phase of the thermoplastic dynamically vulcanized rubber is ethylene propylene diene monomer rubber, and the mass of the ethylene propylene diene monomer rubber accounts for 40% - 70% of the sum of the mass of the ethylene propylene diene monomer rubber and the polypropylene.

[0036] In one embodiment, the performing a molding process on the thermoplastic vulcanized rubber includes: the injection molding process sequentially includes an injection stage and a molding stage. In the injection stage, the thermoplastic vulcanized rubber is heated into a molten state by an injection molding machine, and in the molding stage, the molten thermoplastic vulcanized rubber is injected into a mold and the thermoplastic vulcanized rubber is solidified and shaped in the mold.

[0037] In the injection molding stage, the thermoplastic vulcanizate sequentially passes through the feeding section, melting section, and metering section of the screw of the injection molding machine. The temperature of the feeding section is 160°C - 180°C, the temperature of the melting section is 180°C - 200°C, the temperature of the metering section is 200°C - 220°C, the temperature of the nozzle of the injection molding machine is 200°C - 220°C, and the temperature of the mold in the molding stage is 40°C - 60°C; and / or

[0038] The screw rotation speed of the injection molding machine is 100 r / min - 200 r / min, the injection speed in the injection molding stage is 30 mm / s - 40 mm / s, the injection pressure in the injection molding stage is 60 Mpa - 80 Mpa, and the injection time in the injection molding stage is 3 s - 5 s; and / or

[0039] The molding stage includes a feeding stage, a pressure holding stage, a cooling stage, and a mold opening stage that are carried out sequentially. The pressure holding pressure in the pressure holding stage is 60 Mpa - 80 Mpa, the pressure holding speed in the pressure holding stage is 10 mm / s - 20 mm / s, the pressure holding time in the pressure holding stage is 3 s - 5 s, and the cooling time in the cooling stage is 10 s - 20 s.

[0040] In a third aspect, an embodiment of the present invention provides an electrolytic cell, including the above-mentioned sealing gasket, or a sealing gasket prepared by the preparation method of the above-mentioned sealing gasket.

[0041] Advantageous effects of the embodiments of the present invention:

[0042] In the embodiments of the invention, by respectively protruding a plurality of first convex rings and a plurality of second convex rings that are sequentially surrounded on the opposite first surface and second surface of the gasket body, when the sealing gasket is applied, the first convex rings and the second convex rings can undergo elastic deformation, thereby achieving a sealing effect. By forming a first groove between two adjacent first convex rings and a second groove between two adjacent second convex rings, when the first convex rings and the second convex rings undergo elastic deformation, the sealing gasket can better fit the surfaces of the components on both sides thereof, thereby enhancing the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0044] Figure 1 It is a schematic structural diagram of the sealing gasket provided by the embodiment of the present invention;

[0045] Figure 2Yes Figure 1 A sectional view taken along A-A in;

[0046] Figure 3 Yes Figure 2 An enlarged view at position B in;

[0047] Figure 4 Yes Figure 2 Another enlarged view at position B in;

[0048] Figure 5 Yes Figure 2 Yet another enlarged view at position B in.

[0049] Explanation of reference numerals in the drawings: gasket body - 1; first surface - 11; second surface - 12; first sealing portion - 2; first convex ring - 21; first groove - 22; second sealing portion - 3; second convex ring - 31; second groove - 32; flow channel hole - 4. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present invention. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise stated, the orientation terms such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0051] The material of the commonly used sealing gasket for electrolytic cells is polytetrafluoroethylene (PTFE) and its modified materials. This kind of sealing gasket cannot be disassembled and reassembled repeatedly after being assembled in the electrolytic cell, has a high cost, and contains fluorine in the material, which is not environmentally friendly.

[0052] In a first aspect, an embodiment of the present invention provides a sealing gasket. Please refer to the following Figures 1-5 , the sealing gasket includes:

[0053] A gasket body 1 having opposite first surface 11 and second surface 12;

[0054] A first sealing portion 2, the first sealing portion 2 includes a plurality of first convex rings 21 that are sequentially surrounded and protrude on the first surface 11. Between two adjacent first convex rings 21, the first surface 11 is concave to form a first groove 22;

[0055] The second sealing portion 3 includes a plurality of second convex rings 31 that are successively surrounded and protrude on the second surface 12. Between two adjacent second convex rings 31, a second groove 32 is concavely formed in the second surface 12.

[0056] It can be understood that by respectively protruding a plurality of first convex rings 21 and a plurality of second convex rings 31 that are successively surrounded on the opposite first surface 11 and second surface 12 of the gasket body 1, when the sealing gasket is applied, the first convex rings 21 and the second convex rings 31 can undergo elastic deformation, thereby achieving a sealing effect. By forming a first groove 22 between two adjacent first convex rings 21 and forming a second groove 32 between two adjacent second convex rings 31, when the first convex rings 21 and the second convex rings 31 undergo elastic deformation, the deformation amount of the gasket body caused by the elastic deformation of the first convex rings 21 and the second convex rings 31 can be compensated, so that the sealing gasket can better fit the surface of the components on both sides thereof, such as better fitting the minute unevenness of the surface of the pole frame of the electrolytic cell, thereby improving the sealing effect. At the same time, the elastic deformation ability of the sealing gasket can be increased, so that the sealing gasket can be disassembled and assembled repeatedly, and the friction force between the sealing gasket and the components on both sides thereof can be increased, thereby preventing the gasket from shifting.

[0057] It can be understood that the sealing gasket is sheet-shaped and can be disposed between two components to increase the connection sealing performance between the two components. The first convex ring 21 is a convex structure disposed on the first surface 11 and can be integrally injection-molded with the gasket body 1, thereby increasing the structural stability of the sealing gasket and facilitating processing. At least two first convex rings 21 are provided and are sequentially arranged around the first surface 11. As an example, the number of the first convex rings 21 is three, namely the first convex ring A, the first convex ring B, and the first convex ring C, where the first convex ring A is the innermost ring, the first convex ring B surrounds the first convex ring A and is outside the first convex ring A, the first convex ring C surrounds the first convex ring B and is outside the first convex ring B, and the first convex ring B is located between the first convex ring A and the first convex ring C. The multiple sequentially arranged first convex rings 21 can be equally spaced, thereby forming a labyrinth seal structure. The second convex ring 31 is a convex structure disposed on the second surface 12 and can be integrally injection-molded with the gasket body 1, thereby increasing the structural stability of the sealing gasket and facilitating processing. Similar to the first convex ring 21, at least two second convex rings 31 are provided and are sequentially arranged around the second surface 12. The multiple sequentially arranged first convex rings 21 can be equally spaced, thereby forming a labyrinth seal structure. A first groove 22 can be provided between every two adjacent first convex rings 21, or a first groove 22 can be provided between some adjacent first convex rings 21. The number of the first grooves 22 between two adjacent first convex rings 21 can be one or multiple. A second groove 32 can be provided between every two adjacent second convex rings 31, or a second groove 32 can be provided between some adjacent second convex rings 31. The number of the second grooves 32 between two adjacent second convex rings 31 can be one or multiple.

[0058] It can be understood that by making the first convex ring 21 correspond to the second groove 32 and the second convex ring 31 correspond to the first groove 22, when the first convex ring 21 and the second convex ring 31 undergo elastic deformation, the compensation ability of the first groove 22 and the second groove 32 for the deformation amount of the gasket body caused by the elastic deformation of the first convex ring 21 and the second convex ring 31 can be further improved, thereby improving the sealing effect, increasing the elastic deformation ability of the sealing gasket and the friction force between the sealing gasket and the components on its two sides, and also facilitating the integral injection molding of the sealing gasket.

[0059] It can be understood that the correspondence between the first convex ring 21 and the second groove 32 means that the first convex ring 21 and the second groove 32 are respectively disposed on the first surface 11 and the second surface 12 of the gasket body 1 in opposite directions, and the connection between the first convex ring 21 and the first surface 11 and the notch of the second groove 32 can be relatively arranged. The correspondence between the second convex ring 31 and the first groove 22 means that the second convex ring 31 and the first groove 22 are respectively disposed on the second surface 12 and the first surface 11 of the gasket body 1 in opposite directions, and the connection between the second convex ring 31 and the second surface 12 and the notch of the second groove 32 can be relatively arranged.

[0060] In one embodiment, the cross-sectional shape of the first protruding ring 21 is a triangle (eg Figure 5 As shown), semicircular, rectangular, trapezoidal (as shown Figure 3 as shown) or arched (as Figure 4 shown).

[0061] It can be understood that the first protruding ring 21 is an annular protrusion, and the cross section of the first protruding ring 21 refers to the cross section formed by cutting the first protruding ring 21 along the thickness direction of the gasket body 1 (from the first surface 11 to the second surface 12 ).

[0062] In one embodiment, the cross-sectional shape of the second protruding ring 31 is a triangle (eg Figure 5 As shown), semicircular, rectangular, trapezoidal (as shown Figure 3 as shown) or arched (as Figure 4 shown).

[0063] It can be understood that the second protruding ring 31 is an annular protrusion, and the cross section of the second protruding ring 31 refers to the cross section formed by cutting the second protruding ring 31 along the thickness direction of the gasket body 1 (from the first surface 11 to the second surface 12 ).

[0064] In one embodiment, the first groove 22 is a triangular groove, a semicircular groove, a rectangular groove, a trapezoidal groove or an arcuate groove.

[0065] It can be understood that a triangular groove refers to a groove having a cross section that is triangular (e.g. Figure 5 As shown), a semicircular groove refers to a groove with a semicircular cross section, a rectangular groove refers to a groove with a rectangular cross section, and a trapezoidal groove refers to a groove with a trapezoidal cross section (as shown Figure 3 As shown), an arcuate groove refers to a groove having an arcuate cross section (as shown Figure 4 The cross section of the first groove 22 refers to the cross section formed by cutting the first groove 22 along the thickness direction of the gasket body 1 (the direction from the first surface 11 to the second surface 12).

[0066] In one embodiment, the second groove 32 is a triangular groove, a semicircular groove, a rectangular groove, a trapezoidal groove or an arcuate groove.

[0067] It can be understood that a triangular groove refers to a groove having a cross section that is triangular (e.g. Figure 5 As shown), a semicircular groove refers to a groove with a semicircular cross section, a rectangular groove refers to a groove with a rectangular cross section, and a trapezoidal groove refers to a groove with a trapezoidal cross section (as shown Figure 3 As shown), an arcuate groove refers to a groove having an arcuate cross section (as shown Figure 4 The cross section of the second groove 32 refers to a cross section (a cross section of the concave portion) formed by cutting the second groove 32 along the thickness direction of the gasket body 1 (a direction from the first surface 11 to the second surface 12).

[0068] As an example, the cross-sections of the first convex ring 21 and the second groove 32 are symmetric figures. For example, the cross-section of the first convex ring 21 is an isosceles triangle, and the cross-section of the second groove 32 is also an isosceles triangle. Their symmetry axes all extend along the thickness direction of the gasket body 1, and the symmetry axes of the cross-sections of the first convex ring 21 and the second groove 32 are collinear. Thus, the first groove 22 can better compensate for the deformation of the gasket body caused by the elastic deformation of the first convex ring 21 and the second convex ring 31. The cross-sections of the second convex ring 31 and the first groove 22 are symmetric figures. For example, the cross-section of the second convex ring 31 is an isosceles triangle, and the cross-section of the first groove 22 is also an isosceles triangle. Their symmetry axes all extend along the thickness direction of the gasket body 1, and the symmetry axes of the cross-sections of the second convex ring 31 and the first groove 22 are collinear. Thus, the second groove 32 can better compensate for the deformation of the gasket body caused by the elastic deformation of the first convex ring 21 and the second convex ring 31.

[0069] In one embodiment, the shape of the cross-section of the first groove 22 is the same as the shape of the cross-section of the second convex ring 31.

[0070] It can be understood that by making the shape of the cross-section of the first groove 22 the same as the shape of the cross-section of the second convex ring 31, when the second convex ring 31 is stressed and undergoes elastic deformation, the first groove 22 can better compensate for the deformation of the gasket body in the thickness direction of the sealing gasket. The shape of the cross-section of the first groove 22 being the same as the shape of the cross-section of the second convex ring 31 means that the two shapes are shapes that can be scaled proportionally or completely overlapped after translation. As an example, the shape of the cross-section of the first groove 22 is a trapezoid, and the shape of the cross-section of the second convex ring 31 is also a trapezoid. They are trapezoids that can be scaled proportionally or completely overlapped after translation.

[0071] In one embodiment, the cross-sectional area of the first groove 22 is smaller than the cross-sectional area of the second convex ring 31.

[0072] It can be understood that by making the cross-sectional area of the first groove 22 smaller than the cross-sectional area of the second convex ring 31, while increasing the elastic deformation ability of the sealing gasket and the friction force between it and the components on both sides, the overall strength of the sealing gasket can be ensured, thereby improving the sealing performance of the sealing gasket.

[0073] In one embodiment, the shape of the cross-section of the second groove 32 is the same as the shape of the cross-section of the first convex ring 21.

[0074] It can be understood that by making the shape of the cross-section of the second groove 32 the same as the shape of the cross-section of the first convex ring 21, when the first convex ring 21 is stressed and undergoes elastic deformation, the second groove 32 can better compensate for the deformation of the gasket body in the thickness direction of the first convex ring 21. The shape of the cross-section of the second groove 32 being the same as the shape of the cross-section of the first convex ring 21 means that the shapes of the two are in a scaled proportion or can be completely overlapped after translation. As an example, the shape of the cross-section of the second groove 32 is triangular, and the shape of the cross-section of the first convex ring 21 is also triangular, and the two are triangular in scaled proportion or can be completely overlapped after translation.

[0075] In one embodiment, the cross-sectional area of the second groove 32 is smaller than the cross-sectional area of the first convex ring 21.

[0076] It can be understood that by making the cross-sectional area of the second groove 32 smaller than the cross-sectional area of the first convex ring 21, while increasing the elastic deformation ability of the gasket and the friction force between the gasket and the components on both sides, the overall strength of the gasket can be ensured, thereby improving the sealing performance of the gasket.

[0077] In one embodiment, the shape and size of the cross-section of the first convex ring 21 are the same as the shape and size of the cross-section of the second convex ring 31.

[0078] It can be understood that by making the shape and size of the cross-section of the first convex ring 21 the same as the shape and size of the cross-section of the second convex ring 31, the structural symmetry of the gasket can be improved, the deformation ability and pressure-bearing ability on both sides of the gasket can be balanced, and thus the sealing effect of the gasket can be improved. The shape and size of the cross-section of the first convex ring 21 being the same as the shape and size of the cross-section of the second convex ring 31 means that the two can be completely overlapped through rotation and translation.

[0079] In one embodiment, the thickness of the gasket body 1 is 0.5 mm - 2 mm, and for example, it can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc.

[0080] In one embodiment, the width of the first convex ring 21 is 0.5 mm - 2 mm, and for example, it can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc., and the height of the first convex ring 21 is 0.5 mm - 2 mm, and for example, it can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc.

[0081] It can be understood that by controlling the width and height of the first convex ring 21, its strength and elastic deformation ability can be controlled, thereby improving the sealing effect of the sealing gasket. The width of the first convex ring 21 refers to the width from the inner side to the outer side of the surface of the first convex ring 21 in contact with the first surface 11. The height of the first convex ring 21 refers to the height by which the first convex ring 21 protrudes from the first surface 11 in the direction away from the first surface 11.

[0082] In an embodiment, the width of the second convex ring 31 is 0.5 mm - 2 mm, for example, it can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc., and the height of the second convex ring 31 is 0.5 mm - 2 mm, for example, it can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc.

[0083] It can be understood that by controlling the width and height of the second convex ring 31, its strength and elastic deformation ability can be controlled, thereby improving the sealing effect of the sealing gasket. The width of the second convex ring 31 refers to the width from the inner side to the outer side of the surface of the second convex ring 31 in contact with the second surface 12. The height of the second convex ring 31 refers to the height by which the second convex ring 31 protrudes from the second surface 12 in the direction away from the second surface 12.

[0084] In an embodiment, the width of the first groove 22 is 0.1 mm smaller than the width of the second convex ring 31, and the depth of the first groove 22 is 0.1 mm smaller than the height of the second convex ring 31.

[0085] It can be understood that by making the width of the first groove 22 0.1 mm smaller than the width of the second convex ring 31 and the depth of the first groove 22 0.1 mm smaller than the height of the second convex ring 31, while increasing the elastic deformation ability of the sealing gasket and the friction force between it and the components on both sides, the overall strength of the sealing gasket can be ensured, thereby improving the sealing performance of the sealing gasket. The width of the first groove 22 refers to the width of the groove opening in the direction from the inner side to the outer side of the second convex ring 31.

[0086] In an embodiment, the width of the second groove 32 is 0.1 mm smaller than the width of the first convex ring 21, and the depth of the second groove 32 is 0.1 mm smaller than the height of the first convex ring 21.

[0087] It can be understood that by making the width of the second groove 32 0.1 mm smaller than the width of the first convex ring 21 and the depth of the second groove 32 0.1 mm smaller than the height of the first convex ring 21, while increasing the elastic deformation ability of the sealing gasket and the friction force between the components on its two sides, the overall strength of the sealing gasket can be ensured, thereby improving the sealing performance of the sealing gasket. The width of the second groove 32 refers to the width in the direction from the inner side to the outer side of the first convex ring 21 at the notch of the groove.

[0088] In an embodiment, the distance between two adjacent first convex rings 21 is 2 mm - 5 mm, and for example, it can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0089] It can be understood that by controlling the distance between two adjacent first convex rings 21, the overall deformation ability of the sealing gasket can be controlled. The distance between two adjacent first convex rings 21 refers to the distance between the sides of the two adjacent first convex rings 21 that are in contact with the first surface 11 and are close to each other.

[0090] In an embodiment, the distance between two adjacent second convex rings 31 is 2 mm - 5 mm, and for example, it can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0091] It can be understood that by controlling the distance between two adjacent second convex rings 31, the overall deformation ability of the sealing gasket can be controlled. The distance between two adjacent second convex rings 31 refers to the distance between the sides of the two adjacent second convex rings 31 that are in contact with the second surface 12 and are close to each other.

[0092] In an embodiment, the distance between two adjacent first grooves 22 is 2 mm - 5 mm, and for example, it can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0093] It can be understood that by controlling the distance between two adjacent first grooves 22, the overall deformation ability of the sealing gasket can be controlled. The distance between two adjacent first grooves 22 refers to the distance between the sides of the two adjacent first grooves 22 that are close to each other at the notch.

[0094] It can be understood that the distance between two adjacent second grooves 32 is 2 mm - 5 mm, and for example, it can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0095] It can be understood that by controlling the distance between two adjacent first grooves 22, the overall deformation ability of the sealing gasket can be controlled. The distance between two adjacent first grooves 22 refers to the distance between the sides of the two adjacent first grooves 22 that are close to each other at the notch.

[0096] In one embodiment, a plurality of first convex rings 21 are arranged at equal intervals, a first groove 22 is arranged in the middle of two adjacent first convex rings 21, and the first groove 22 and the first convex ring 21 are arranged at intervals.

[0097] It can be understood that by arranging a plurality of first convex rings 21 at equal intervals and arranging the first groove 22 in the middle of two adjacent first convex rings 21, when the first convex ring 21 undergoes elastic deformation, the first groove 22 can better compensate for the deformation amount of the gasket body along the width direction of the first convex ring 21. By arranging the first groove 22 and the first convex ring 21 at intervals, while increasing the elastic deformation ability of the gasket and the frictional force between the gasket and the components on its two sides, the overall strength of the gasket can be ensured, thereby improving the sealing performance of the gasket. The first groove 22 being arranged in the middle of two adjacent first convex rings 21 means that the first groove 22 is equidistant from the two adjacent first convex rings 21.

[0098] In one embodiment, a plurality of second convex rings 31 are arranged at equal intervals, a second groove 32 is arranged in the middle of two adjacent second convex rings 31, and the second groove 32 and the second convex ring 31 are arranged at intervals.

[0099] It can be understood that by arranging a plurality of second convex rings 31 at equal intervals and arranging the second groove 32 in the middle of two adjacent second convex rings 31, when the second convex ring 31 undergoes elastic deformation, the second groove 32 can better compensate for the deformation amount of the gasket body along the width direction of the second convex ring 31. By arranging the second groove 32 and the second convex ring 31 at intervals, while increasing the elastic deformation ability of the gasket and the frictional force between the gasket and the components on its two sides, the overall strength of the gasket can be ensured, thereby improving the sealing performance of the gasket. The second groove 32 being arranged in the middle of two adjacent second convex rings 31 means that the second groove 32 is equidistant from the two adjacent second convex rings 31.

[0100] In one embodiment, the gasket body 1 is annular, the center lines of the first sealing portion 2 and the second sealing portion 3 are collinear with the center line of the gasket body 1, the distance between the first sealing portion 2 and the edge of the gasket body 1 is 5 mm - 10 mm, for example, it can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc., and the distance between the second sealing portion 3 and the edge of the gasket body 1 is 5 mm - 10 mm, for example, it can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0101] It can be understood that the width of the first sealing portion 2 can be set according to the width of the gasket body 1 and the application scenario. The center lines of the gasket body 1, the first sealing portion 2, and the second sealing portion 3 all extend along the axial direction of the ring through the center of the ring. The distance between the first sealing portion 2 and the edge of the gasket body 1 refers to the distance between the side of the first sealing portion 2 close to the edge of the gasket body 1 and the edge of the gasket body 1. The distance between the second sealing portion 3 and the edge of the gasket body 1 refers to the distance between the side of the first sealing portion 2 close to the edge of the gasket body 1 and the edge of the gasket body 1.

[0102] In an embodiment, the sealing gasket is further provided with a flow channel hole 4 penetrating through the gasket body 1, the first sealing portion 2, and the second sealing portion 3, and the edge of the flow channel hole 4 is arranged within the regions where the first sealing portion 2 and the second sealing portion 3 are located.

[0103] It can be understood that by arranging the edge of the flow channel hole 4 within the regions where the first sealing portion 2 and the second sealing portion 3 are located, the sealing performance around the flow channel hole 4 can be improved, and the possibility of leakage from the flow channel hole 4 to the outside can be reduced.

[0104] In an embodiment, the material of the sealing gasket includes thermoplastic vulcanizate (TPV). The continuous phase of the thermoplastic vulcanizate (TPV) is polypropylene (PP), and the dispersed phase of the thermoplastic vulcanizate (TPV) is ethylene propylene diene monomer (EPDM). The mass of the ethylene propylene diene monomer (EPDM) accounts for 40%-70% of the sum of the masses of the ethylene propylene diene monomer (EPDM) and polypropylene (PP), and can be, for example, 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc.

[0105] In this application, by using the thermoplastic vulcanizate (EPDM / PP-TPV) formed by ethylene propylene diene monomer (EPDM) and polypropylene (PP) to make the sealing gasket and controlling the ratio of ethylene propylene diene monomer (EPDM) and polypropylene (PP), the formed sealing gasket can have good sealing performance, insulation performance, and alkali resistance, and can be used for sealing an electrolytic cell loaded with strong alkaline liquid; the sealing gasket made of thermoplastic vulcanizate (EPDM / PP-TPV) has good stability and can be disassembled and assembled repeatedly. When applied to an AEM hydrogen production electrolytic cell, it can facilitate the industrial production and subsequent maintenance of the AEM hydrogen production electrolytic cell; the sealing gasket made of thermoplastic vulcanizate (EPDM / PP-TPV) does not contain fluorine, is environmentally friendly, and can be recycled; the process of making the sealing gasket with thermoplastic vulcanizate (EPDM / PP-TPV) is simple, can be produced by one-step injection molding, and has low production cost.

[0106] It can be understood that thermoplastic vulcanizate (TPV) mainly consists of two parts. One part is plastic, serving as the continuous phase, and the other part is rubber, serving as the dispersed phase. Therefore, EPDM / PP-TPV combines the characteristics of both rubber and plastic. It has the elasticity of rubber, enabling the sealing gaskets formed by its processing to have good sealing effects and be reusable. It also has the injection moldability of plastic, making it convenient for processing and forming when producing sealing gaskets. When producing thermoplastic vulcanizate EPDM / PP-TPV, in addition to the base materials EPDM and PP, fillers (such as CaCO3), white oil, and additives (such as vulcanizing agents, lubricants, etc.) are usually added.

[0107] In a second aspect, an embodiment of the present invention provides a method for preparing a sealing gasket, including:

[0108] Providing thermoplastic vulcanizate (TPV), and performing a forming process on the thermoplastic vulcanizate to obtain a sealing gasket;

[0109] Among them, the continuous phase of the thermoplastic vulcanizate (TPV) is polypropylene (PP), and the dispersed phase of the thermoplastic vulcanizate (TPV) is ethylene propylene diene monomer (EPDM). The mass of the ethylene propylene diene monomer (EPDM) accounts for 40%-70% of the sum of the masses of the ethylene propylene diene monomer (EPDM) and polypropylene (PP). For example, it can be 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc.

[0110] In this application, the thermoplastic vulcanizate (EPDM / PP-TPV) can be used to produce sealing gaskets through a one-step injection molding method, which has a simple process and low production cost.

[0111] It can be understood that the sealing gasket obtained through the forming process may still have flash, and it can be trimmed. The trimming methods can include manual trimming, mechanical trimming, and cryogenic trimming. Mechanical trimming includes punching, grinding with a grinding wheel, and trimming with a round knife. Cryogenic trimming is to use liquid nitrogen to make the flash of the finished product brittle at low temperature, and use specific cryogenic particles to strike the flash to quickly remove the flash.

[0112] In one embodiment, the thermoplastic vulcanizate is granular.

[0113] In one embodiment, the thermoplastic vulcanizate is granular, and the average particle size of the thermoplastic vulcanizate is 2 mm - 5 mm. For example, it can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0114] In one embodiment, the molding process is an injection molding process. Before molding the thermoplastic dynamically vulcanized rubber, it further includes: drying the thermoplastic dynamically vulcanized rubber. In this way, the bubbles generated by the vaporization of the moisture contained in the thermoplastic dynamically vulcanized rubber during the injection molding process can be reduced, thereby improving the quality of the formed sealing gasket.

[0115] In one embodiment, the drying temperature is 80°C - 100°C, for example, it can be 80°C, 82°C, 84°C, 86°C, 88°C, 90°C, 92°C, 94°C, 96°C, 98°C, 100°C, etc., and the drying time is 2h - 4h, for example, it can be 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, 3.2h, 3.4h, 3.6h, 3.8h, 4h, etc. In this way, the dried thermoplastic dynamically vulcanized rubber can have better ductility and is not easily cracked.

[0116] It can be understood that the drying method of the thermoplastic dynamically vulcanized rubber can adopt hot air drying. The hot air drying has a fast drying speed and adjustable temperature, which is suitable for large-scale production.

[0117] In one embodiment, molding the thermoplastic vulcanized rubber includes: the injection molding process sequentially includes an injection stage and a molding stage. In the injection stage, the thermoplastic vulcanized rubber is heated to a molten state by an injection molding machine, and in the molding stage, the molten thermoplastic vulcanized rubber is injected into a mold and the thermoplastic vulcanized rubber is solidified and shaped in the mold.

[0118] In the injection stage, the thermoplastic vulcanized rubber sequentially passes through the feeding section, melting section, and metering section of the screw of the injection molding machine. The temperature of the feeding section is 160°C - 180°C, for example, it can be 160°C, 162°C, 164°C, 166°C, 168°C, 170°C, 172°C, 174°C, 176°C, 178°C, 180°C, etc., the temperature of the melting section is 180°C - 200°C, for example, it can be 180°C, 182°C, 184°C, 186°C, 188°C, 190°C, 192°C, 194°C, 196°C, 198°C, 200°C, etc., the temperature of the metering section is 200°C - 220°C, for example, it can be 200°C, 202°C, 204°C, 206°C, 208°C, 210°C, 212°C, 214°C, 216°C, 218°C, 220°C, etc., the temperature of the nozzle of the injection molding machine is 200°C - 220°C, for example, it can be 200°C, 202°C, 204°C, 206°C, 208°C, 210°C, 212°C, 214°C, 216°C, 218°C, 220°C, etc., and the temperature of the mold in the molding stage is 40°C - 60°C, for example, it can be 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, 52°C, 54°C, 56°C, 58°C, 60°C, etc. In this way, the formed sealing gasket can have good sealing performance, stability, etc.

[0119] It can be understood that the molding process of thermoplastic vulcanizate can be completed by an injection molding machine. After heating the material to the plasticizing temperature through the barrel of the injection molding machine, the material is then injected into the cavity of the mold for molding. The temperature of the mold in the molding stage refers to the temperature inside the mold.

[0120] In one embodiment, the screw rotation speed of the injection molding machine is 100 r / min - 200 r / min, for example, it can be 100 r / min, 110 r / min, 120 r / min, 130 r / min, 140 r / min, 150 r / min, 160 r / min, 170 r / min, 180 r / min, 190 r / min, 200 r / min, etc. The injection speed in the injection stage is 30 mm / s - 40 mm / s, for example, it can be 30 mm / s, 31 mm / s, 32 mm / s, 33 mm / s, 34 mm / s, 35 mm / s, 36 mm / s, 37 mm / s, 38 mm / s, 37 mm / s, 40 mm / s, etc. The injection pressure in the injection stage is 60 Mpa - 80 Mpa, for example, it can be 60 Mpa, 62 Mpa, 64 Mpa, 66 Mpa, 68 Mpa, 70 Mpa, 72 Mpa, 74 Mpa, 76 Mpa, 78 Mpa, 80 Mpa, etc. The injection time in the injection stage is 3 s - 5 s, for example, it can be 3 s, 4 s, 5 s, etc. In this way, the formed sealing gasket can have good sealing performance, stability, etc.

[0121] It can be understood that the injection stage can be completed by an injection molding machine. The injection speed refers to the moving speed of the screw or plunger of the injection molding machine during injection. The injection pressure refers to the pressure applied by the end face of the screw or plunger of the injection molding machine to the melt per unit area during injection. The injection time refers to the shortest time required for the screw or plunger of the injection molding machine to inject the maximum volume of melt into the mold during injection.

[0122] In one embodiment, the molding stage includes a feeding stage, a pressure holding stage, a cooling stage, and a mold opening stage that are carried out in sequence. The pressure holding pressure in the pressure holding stage is 60 Mpa - 80 Mpa. For example, it can be 60 Mpa, 62 Mpa, 64 Mpa, 66 Mpa, 68 Mpa, 70 Mpa, 72 Mpa, 74 Mpa, 76 Mpa, 78 Mpa, 80 Mpa, etc. The pressure holding speed in the pressure holding stage is 10 mm / s - 20 mm / s. For example, it can be 10 mm / s, 11 mm / s, 12 mm / s, 13 mm / s, 14 mm / s, 15 mm / s, 16 mm / s, 17 mm / s, 18 mm / s, 19 mm / s, 20 mm / s, etc. The pressure holding time in the pressure holding stage is 3 s - 5 s. For example, it can be 3 s, 4 s, 5 s, etc. The cooling time in the cooling stage is 10 s - 20 s. For example, it can be 10 s, 11 s, 12 s, 13 s, 14 s, 15 s, 16 s, 17 s, 18 s, 19 s, 20 s, etc. In this way, the formed sealing gasket can have good sealing performance, stability, etc.

[0123] It can be understood that the pressure holding speed in the pressure holding stage refers to the moving speed of the screw or plunger of the injection molding machine in the pressure holding stage when the injection molding stage ends and enters the pressure holding stage during the injection molding process.

[0124] In a third aspect, an embodiment of the present invention provides an electrolytic cell including the above-mentioned sealing gasket.

[0125] The sealing gasket in the present application can be applied to the electrolytic cell for hydrogen production by electrolyzing water with an anion exchange membrane (AEM), and the electrolytic cell can withstand a pressure of 4 Mpa without leakage. The AEM electrolytic cell includes components such as an anode plate, a cathode plate, an anion exchange membrane (AEM), an anode catalyst layer, a cathode catalyst layer, an anode frame, and a cathode frame. The sealing gasket is arranged between the anode frame and the cathode frame.

[0126] Example 1

[0127] A sealing gasket and its preparation method include:

[0128] Take the thermoplastic dynamic vulcanized rubber (EPDM / PP-TPV, where the mass ratio of EPDM / PP is 70:30 and the model is Santoprene TPV) particles (average particle size 3 mm) formed by ethylene propylene diene monomer (EPDM) and polypropylene (PP). After drying at 80 °C for 3 h, add them into an injection molding machine and process them through two stages: an injection molding stage and a molding stage in the injection molding machine to obtain a sealing gasket;

[0129] Among them, the injection molding stage of the injection molding machine includes a feeding section, a melting section, and a metering section that are carried out in sequence. The molding stage is carried out in the mold cavity. The molding process includes a feeding stage, a holding pressure stage, and a cooling stage that are carried out in sequence. After the cooling stage ends, the mold is opened to obtain the sealing gasket. Among them, the temperature of the feeding section is 160°C, the temperature of the melting section is 180°C, the temperature of the metering section is 200°C, the temperature of the nozzle of the injection molding machine is 200°C, the screw rotation speed of the injection molding machine is 100 r / min, the injection speed in the injection molding stage is 30 mm / s, the injection pressure in the injection molding stage is 60 Mpa, the injection time in the injection molding stage is 4 s, the holding pressure in the holding pressure stage is 60 Mpa, the holding pressure speed in the holding pressure stage is 10 mm / s, the holding pressure time in the holding pressure stage is 4 s, and the cooling time in the cooling stage is 10 s.

[0130] Example 2

[0131] This example is basically the same as Example 1, except that the mass ratio of EPDM / PP in this example is changed to 60:40.

[0132] Example 3

[0133] This example is basically the same as Example 1, except that the mass ratio of EPDM / PP in this example is changed to 50:50.

[0134] Example 4

[0135] This example is basically the same as Example 1, except that the mass ratio of EPDM / PP in this example is changed to 40:60.

[0136] Example 5

[0137] This example is basically the same as Example 1, except that the drying temperature of the thermoplastic dynamically vulcanized rubber (EPDM / PP-TPV) particles in this example is 90°C.

[0138] Example 6

[0139] This example is basically the same as Example 1, except that the drying temperature of the thermoplastic dynamically vulcanized rubber (EPDM / PP-TPV) particles in this example is 100°C.

[0140] Example 7

[0141] This example is basically the same as Example 1, except that the drying time of the thermoplastic dynamically vulcanized rubber (EPDM / PP-TPV) particles in this example is 2 h.

[0142] Example 8

[0143] This embodiment is basically the same as Embodiment 1, except that the drying time of the thermoplastic dynamically vulcanized rubber (EPDM / PP-TPV) particles in this embodiment is 4 h.

[0144] Embodiment 9

[0145] This embodiment is basically the same as Embodiment 1, except that the temperature of the feeding section in this embodiment is 170 °C.

[0146] Embodiment 10

[0147] This embodiment is basically the same as Embodiment 1, except that the temperature of the feeding section in this embodiment is 180 °C.

[0148] Embodiment 11

[0149] This embodiment is basically the same as Embodiment 1, except that the temperature of the melting section in this embodiment is 190 °C.

[0150] Embodiment 12

[0151] This embodiment is basically the same as Embodiment 1, except that the temperature of the melting section in this embodiment is 200 °C.

[0152] Embodiment 13

[0153] This embodiment is basically the same as Embodiment 1, except that the temperature of the metering section in this embodiment is 210 °C.

[0154] Embodiment 14

[0155] This embodiment is basically the same as Embodiment 1, except that the temperature of the metering section in this embodiment is 220 °C.

[0156] Embodiment 15

[0157] This embodiment is basically the same as Embodiment 1, except that the nozzle temperature of the injection molding machine in this embodiment is 210 °C.

[0158] Embodiment 16

[0159] This embodiment is basically the same as Embodiment 1, except that the nozzle temperature of the injection molding machine in this embodiment is 220 °C.

[0160] Embodiment 17

[0161] This embodiment is basically the same as Embodiment 1, except that the screw rotation speed of the injection molding machine in this embodiment is 150 r / min.

[0162] Embodiment 18

[0163] This embodiment is basically the same as Embodiment 1, except that the screw rotation speed of the injection molding machine in this embodiment is 200 r / min.

[0164] Embodiment 19

[0165] This embodiment is basically the same as Embodiment 1, except that the injection speed in the injection molding stage of this embodiment is 35 mm / s.

[0166] Embodiment 20

[0167] This embodiment is basically the same as Embodiment 1, except that the injection speed in the injection molding stage of this embodiment is 40 mm / s.

[0168] Embodiment 21

[0169] This embodiment is basically the same as Embodiment 1, except that the injection pressure in the injection molding stage of this embodiment is 70 Mpa.

[0170] Embodiment 22

[0171] This embodiment is basically the same as Embodiment 1, except that the injection pressure in the injection molding stage of this embodiment is 80 Mpa.

[0172] Embodiment 23

[0173] This embodiment is basically the same as Embodiment 1, except that the holding pressure in the holding pressure stage of this embodiment is 70 Mpa.

[0174] Embodiment 24

[0175] This embodiment is basically the same as Embodiment 1, except that the holding pressure in the holding pressure stage of this embodiment is 80 Mpa.

[0176] Embodiment 25

[0177] This embodiment is basically the same as Embodiment 1, except that the holding pressure speed in the holding pressure stage of this embodiment is 15 mm / s.

[0178] Embodiment 26

[0179] This embodiment is basically the same as Embodiment 1, except that the holding pressure speed in the holding pressure stage of this embodiment is 20 mm / s.

[0180] Embodiment 27

[0181] This embodiment is basically the same as Embodiment 1, except that the cooling time in the cooling stage of this embodiment is 15 s.

[0182] Embodiment 28

[0183] This embodiment is basically the same as Embodiment 1, except that the cooling time in the cooling stage of this embodiment is 20 s.

[0184] Example 29

[0185] This embodiment is basically the same as Embodiment 1, except that the injection speed in the injection molding stage of this embodiment is 50 mm / s.

[0186] Example 30

[0187] This embodiment is basically the same as Embodiment 1, except that the injection pressure in the injection molding stage of this embodiment is 40 Mpa.

[0188] Comparative Example 1

[0189] This comparative example is basically the same as Embodiment 1, except that in this comparative example, ethylene propylene diene monomer (EPDM) is replaced by nitrile butadiene rubber (NBR), that is, EPDM / PP-TPV is replaced by NBR / PP-TPV.

[0190] Comparative Example 2

[0191] This embodiment is basically the same as Embodiment 1, except that the mass ratio of EPDM / PP in this embodiment is changed to 80:20.

[0192] Comparative Example 3

[0193] This embodiment is basically the same as Embodiment 1, except that the mass ratio of EPDM / PP in this embodiment is changed to 20:80.

[0194] Test Example: The performance of the sealing gaskets obtained in the examples and comparative examples was tested as follows, and the test results are shown in Table 1.

[0195] Test method for tensile strength and elongation at break: The test was carried out according to GB / T 528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress - strain properties". This standard stipulates the operation methods for the tensile stress - strain properties test of vulcanized rubber or thermoplastic rubber, including specimen preparation, test conditions, test procedures and result calculation (including tensile strength, elongation at break), etc.

[0196] Test method for tear strength: The test was carried out according to GB / T 529-2008 "Rubber, vulcanized or thermoplastic - Determination of tear strength (trouser, angle and crescent test pieces)". This standard stipulates the test methods for the tear strength of vulcanized rubber or thermoplastic rubber, which are applicable to different types of test pieces.

[0197] Shore hardness test method: The test is carried out in accordance with GB / T 531.1-2008 "Rubber, vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)", which specifies the test method for determining the hardness of rubber using a durometer.

[0198] Compression set test method: The test is carried out in accordance with GB / T 1683-2018 "Vulcanized rubber - Determination of compression set at constant deformation", which specifies the method for determining the compression set of vulcanized rubber under constant deformation.

[0199] Alkali resistance test method: The test is carried out in accordance with GB / T 1690-2010 "Rubber, vulcanized or thermoplastic - Test method for resistance to liquids", which specifies the method for determining the solvent resistance of rubber.

[0200] Electrolyzer airtightness test method: Install the sealing gaskets of the examples and comparative examples in the electrolyzer, and conduct the electrolyzer airtightness test in accordance with GB / T 37562-2019 "Technical conditions for pressure type water electrolysis hydrogen production system". This standard specifies the method for determining the airtightness of the electrolyzer. See section 6.2.2 of this standard, and

[0201] "It is qualified if the average hourly leakage rate does not exceed 0.5%".

[0202] Table 1 Test data

[0203]

[0204]

[0205] As can be seen from Table 1:

[0206] Compared with Comparative Examples 1-3, the leakage rates of the electrolyzers in Examples 1-4 are lower than those in Comparative Examples 1-3. It can be seen that the rubber type and the ratio of rubber to plastic in the thermoplastic dynamically vulcanized rubber affect the sealing performance of the sealing gasket. The alkali resistance of the sealing gaskets in Examples 1-4 is stronger than that of the sealing gasket in Comparative Example 1. It can be seen that the rubber type in the thermoplastic dynamically vulcanized rubber affects the alkali resistance of the sealing gasket.

[0207] Compared with Examples 29 and 30, the appearance of the sealing gaskets in Examples 1-28 is good and the dimensions are qualified. The sealing gasket in Example 29 has air bubbles and the dimensions are out of tolerance. The sealing gasket in Example 30 lacks material and the dimensions are out of tolerance. It can be seen that the preparation process of the sealing gasket (such as the injection speed and injection pressure in the injection molding stage) affects its appearance and dimensions.

[0208] The above has introduced the embodiments of the present invention in detail. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A sealing gasket, characterized in that, The sealing gasket includes: a gasket body having opposite first and second surfaces; a first sealing portion, the first sealing portion including a plurality of first convex rings that are sequentially surrounded and protrude on the first surface, and between two adjacent first convex rings, a first groove is concavely formed in the first surface; a second sealing portion, the second sealing portion including a plurality of second convex rings that are sequentially surrounded and protrude on the second surface, and between two adjacent second convex rings, a second groove is concavely formed in the second surface.

2. The gasket according to claim 1, characterized in that, The first convex ring corresponds to the second groove, and / or the second convex ring corresponds to the first groove.

3. The gasket according to claim 1, wherein The cross-sectional shape of the first convex ring is triangular, semi-circular, rectangular, trapezoidal or bow-shaped; and / or The cross-sectional shape of the second convex ring is triangular, semi-circular, rectangular, trapezoidal or bow-shaped; and / or The first groove is a triangular groove, a semi-circular groove, a rectangular groove, a trapezoidal groove or a bow-shaped groove; and / or The second groove is a triangular groove, a semi-circular groove, a rectangular groove, a trapezoidal groove or a bow-shaped groove.

4. The gasket according to claim 1, characterized in that, The shape of the cross-section of the first groove is the same as the shape of the cross-section of the second convex ring; and / or The cross-sectional area of the first groove is smaller than the cross-sectional area of the second convex ring; and / or The shape of the cross-section of the second groove is the same as the shape of the cross-section of the first convex ring; and / or The cross-sectional area of the second groove is smaller than the cross-sectional area of the first convex ring.

5. The gasket according to claim 1, wherein The shape and size of the cross-section of the first convex ring are the same as the shape and size of the cross-section of the second convex ring.

6. The gasket according to claim 1, wherein The thickness of the gasket body is 0.5 mm - 2 mm; The width of the first convex ring is 0.5 mm - 2 mm, and the height of the first convex ring is 0.5 mm - 2 mm; and / or The width of the second convex ring is 0.5 mm - 2 mm, and the height of the second convex ring is 0.5 mm - 2 mm; and / or The width of the first groove is 0.1 mm smaller than the width of the second convex ring, and the depth of the first groove is 0.1 mm smaller than the height of the second convex ring; and / or The width of the second groove is 0.1 mm smaller than the width of the first convex ring, and the depth of the second groove is 0.1 mm smaller than the height of the first convex ring.

7. The gasket according to claim 1, wherein The spacing between two adjacent first convex rings is 2 mm - 5 mm; and / or The spacing between two adjacent second convex rings is 2 mm - 5 mm; and / or The spacing between two adjacent first grooves is 2 mm - 5 mm; and / or The spacing between two adjacent second grooves is 2 mm - 5 mm.

8. The gasket according to claim 1, characterized in that, A plurality of the first convex rings are arranged at equal intervals, the first groove is disposed in the middle between two adjacent first convex rings, and the first groove and the first convex ring are spaced apart; and / or A plurality of the second convex rings are arranged at equal intervals, the second groove is disposed in the middle between two adjacent second convex rings, and the second groove and the second convex ring are spaced apart; and / or The sealing gasket is further provided with a flow channel hole penetrating through the gasket body, the first sealing portion and the second sealing portion, and the edge of the flow channel hole is disposed within the regions where the first sealing portion and the second sealing portion are located.

9. The gasket according to any one of claims 1-8, characterized in that, The material of the sealing gasket includes thermoplastic dynamically vulcanized rubber, the continuous phase of the thermoplastic dynamically vulcanized rubber is polypropylene, the dispersed phase of the thermoplastic dynamically vulcanized rubber is ethylene propylene diene monomer rubber, and the mass of the ethylene propylene diene monomer rubber accounts for 40%-70% of the sum of the mass of the ethylene propylene diene monomer rubber and the polypropylene.

10. A method for preparing a sealing gasket, characterized in that, Comprising: Providing thermoplastic dynamically vulcanized rubber, and performing a shaping process on the thermoplastic vulcanized rubber to obtain a sealing gasket; Wherein, the continuous phase of the thermoplastic dynamically vulcanized rubber is polypropylene, the dispersed phase of the thermoplastic dynamically vulcanized rubber is ethylene propylene diene monomer rubber, and the mass of the ethylene propylene diene monomer rubber accounts for 40%-70% of the sum of the mass of the ethylene propylene diene monomer rubber and the polypropylene.

11. The preparation method of the sealing gasket according to claim 10, characterized in that, The performing the shaping process on the thermoplastic vulcanized rubber includes: the injection molding process sequentially includes an injection stage and a shaping stage. In the injection stage, the thermoplastic vulcanized rubber is heated into a molten state by an injection molding machine, and in the shaping stage, the molten thermoplastic vulcanized rubber is injected into a mold and the thermoplastic vulcanized rubber is cured and shaped in the mold; In the injection stage, the thermoplastic vulcanized rubber sequentially passes through the feeding section, the melting section and the metering section of the screw of the injection molding machine. The temperature of the feeding section is 160°C - 180°C, the temperature of the melting section is 180°C - 200°C, the temperature of the metering section is 200°C - 220°C, the temperature of the nozzle of the injection molding machine is 200°C - 220°C, and the temperature of the mold in the shaping stage is 40°C - 60°C; and / or The screw rotation speed of the injection molding machine is 100 r / min - 200 r / min, the injection speed in the injection stage is 30 mm / s - 40 mm / s, the injection pressure in the injection stage is 60 Mpa - 80 Mpa, and the injection time in the injection stage is 3 s - 5 s; and / or The shaping stage includes a feeding stage, a pressure holding stage, a cooling stage and a mold opening stage that are sequentially performed. The pressure holding pressure in the pressure holding stage is 60 Mpa - 80 Mpa, the pressure holding speed in the pressure holding stage is 10 mm / s - 20 mm / s, the pressure holding time in the pressure holding stage is 3 s - 5 s, and the cooling time in the cooling stage is 10 s - 20 s.

12. An electrolytic cell, characterized in that, Comprising the sealing gasket according to any one of claims 1-9, or the sealing gasket prepared by the preparation method of the sealing gasket according to any one of claims 10-11.

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