Ion exchange membrane surface resistance testing device

Abstract

The utility model relates to ion exchange membrane performance test field discloses a kind of ion exchange membrane surface resistance testing device, including conductivity meter of four-pole electrode (slotted hole), three organic glass flake, three elastic sealing gaskets and ion exchange membrane.Three organic glass pieces are connected in the mode of sliding with hole clamping piece, hole butt joint piece, lower hole clamping piece, three sealing rings are respectively arranged in upper clamping piece upper end, upper clamping piece and butt joint piece hole, lower clamping piece lower end, three are all through hole, ion exchange membrane is placed between upper clamping piece and butt joint piece and covers hole, and constitutes organic glass cell.When using, organic glass cell is clamped into electrode head slot, electrolyte solution conductivity can be measured when measuring with membrane;Remove membrane, conductivity can be measured without membrane;Remove organic glass cell, solution actual conductivity can be measured.Combining electrode constant and membrane surface resistance formula can calculate membrane surface resistance value.The device structure is simple, easy to assemble and disassemble, easy to clean, change sample and adjust experiment setting.

Description

Technical Field

[0001] This utility model relates to the field of ion exchange membrane testing technology, and specifically to an ion exchange membrane surface resistance testing device. Background Technology

[0002] The sheet resistivity of ion exchange membranes is a key parameter for evaluating their performance and directly affects their application in electrochemical devices. Existing testing devices have significant limitations: according to the HY / T166.1-2013 standard, the sheet resistivity testing device includes a conductivity cell and a solution circulation device. The former consists of two half-cells with electrodes tightened together by alignment screws, while the latter includes an organic glass container, a submersible pump, and connecting pipelines. The overall setup is complex, with numerous components, making assembly difficult and operation challenging. Related improvements, such as the sheet resistivity testing device for vanadium battery ion exchange membranes disclosed in patent CN211905519U, still do not solve the same problems.

[0003] In summary, current devices generally suffer from problems such as large size, complex structure, inconvenient assembly, unstable membrane clamping, poor isolation during testing, and cumbersome operation, resulting in low testing accuracy and excessive consumption of electrolyte and membrane samples. Therefore, there is an urgent need to design an ion exchange membrane surface resistance testing device that is simple in structure, easy to assemble, and can guarantee testing accuracy. Utility Model Content

[0004] The purpose of this invention is to provide an ion exchange membrane surface resistance testing device to solve the problems of existing testing devices having complex structures, inconvenient assembly, difficult testing operations, and low testing accuracy. To achieve the above objectives, this utility model provides the following technical solution: An ion exchange membrane surface resistance testing device includes a conductivity meter and an acrylic glass cell. The conductivity meter requires an electrode with slotted holes, which can be a four-electrode graphite electrode. The acrylic glass cell mainly includes three acrylic glass sheets, three elastic sealing gaskets, and an ion exchange membrane for testing. The three acrylic glass sheets include an upper perforated acrylic glass clip, a perforated connector, and a lower perforated acrylic glass clip. The perforated connector is slidably connected to the lower end of the upper perforated acrylic glass clip, and the lower perforated acrylic glass clip is slidably connected to the lower end of the perforated connector. The three elastic sealing gaskets include a first sealing ring, a second sealing ring, and a third sealing ring. The first sealing ring is fixedly connected to the upper end of the perforated plexiglass clip, the second sealing ring is located in the hole between the upper perforated plexiglass clip and the perforated connector, and the third sealing ring is located at the lower end of the lower perforated plexiglass clip. Holes are perforated in the upper perforated plexiglass clip, the perforated connector, and the lower perforated plexiglass clip. An ion exchange membrane is placed between the upper perforated plexiglass clip and the perforated connector, completely covering the holes. After being placed in the electrolyte solution, the plexiglass cell is inserted into the groove of the electrode head, thereby forming two isolation chambers within the electrode. At this time, the conductivity meter displays the conductivity of the electrolyte solution in the membrane-containing state.

[0005] Furthermore, the perforated upper acrylic clip, the perforated connector, and the perforated lower acrylic clip have the same hole shape, ensuring that the ion exchange membrane can stably cover the holes and that the fluid or current path remains stable during the test.

[0006] Furthermore, the upper and lower ends of the perforated connector are respectively provided with sliding grooves that are adapted to the upper perforated acrylic clip and the lower perforated acrylic clip. The lower end of the upper perforated acrylic clip and the upper end of the lower perforated acrylic clip are respectively embedded in the sliding groove to achieve sliding connection, which facilitates quick assembly and adjustment of the relative positions of the three acrylic sheets and ensures the stability of clamping.

[0007] Furthermore, the first, second, and third sealing rings are made of any one of nitrile rubber, fluororubber, silicone rubber, EPDM rubber, neoprene rubber, or polyurethane. Nitrile rubber is preferred, as it possesses good elasticity, sealing properties, and chemical resistance, enabling it to adapt to various media in the test environment and ensuring effective isolation.

[0008] Furthermore, the thickness of the upper perforated acrylic sheet, the perforated connector, and the lower perforated acrylic sheet is 1-2 mm. Acrylic sheets within this thickness range have sufficient structural strength to stably clamp ion exchange membranes and are easy to process.

[0009] Furthermore, the cross-sectional diameter of the first, second, and third sealing rings is 0.5-1.5 mm to ensure that the sealing rings can fit tightly against the contact parts and enhance the sealing effect.

[0010] The technical solution provided by this utility model has the following advantages compared with the known prior art: 1. Simple structure and easy assembly: Quick assembly is achieved through the sliding connection of three acrylic sheets within a four-electrode slotted electrode, eliminating the need for complex connectors and making operation convenient.

[0011] 2. Stable clamping: The sliding connection of the acrylic sheet and the elastic sealing ring can stably clamp the ion exchange membrane, preventing the membrane from shifting during the test.

[0012] 3. Good isolation effect: Three rubber sealing rings form a seal at different positions to ensure effective isolation between the two chambers inside the electrode and reduce the impact of material exchange on the test results.

[0013] 4. Accurate testing: Through stable clamping and good isolation, combined with a conductivity meter, the conductivity under membrane conditions can be accurately measured, thereby accurately calculating the sheet resistance of the ion exchange membrane. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the testing device of this utility model; Figure 2 This is a first exploded perspective view of the present invention; Figure 3 This is a sectional perspective view of the present invention; Figure 4 This is a second exploded perspective view of the present invention; Figure 5 This is the third exploded perspective view of this utility model.

[0016] Figure 6 This diagram illustrates the usage state of installing the three acrylic sheets of this invention into the electrode test head.

[0017] Reference numerals in the attached drawings: 1. Upper perforated acrylic clip; 2. Perforated connector; 3. Lower perforated acrylic clip; 4. First sealing ring; 5. Second sealing ring; 6. Third sealing ring; 7. Sealing ring slot; 8. Limiting clip; 9. Fixing slot; 10. Hole; 11. Conductivity meter; 12. Display screen; 13. Control button; 14. Wire; 15. Electrode test head. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] The present invention will be further described below with reference to the embodiments.

[0020] See attached document Figures 1-5 An ion exchange membrane surface resistance testing device, comprising: The upper perforated plexiglass clip 1 serves as the main support structure of the testing device. Its lower end is connected to the perforated docking piece 2 via a sliding fit. The perforated docking piece 2 is further slidably connected to the lower perforated plexiglass clip 3. The three components are aligned through holes 10 to achieve positioning and clamping of the ion exchange membrane sample. During clamping, the perforated docking piece 2 and the lower perforated plexiglass clip 3 can slide linearly relative to the upper perforated plexiglass clip 1, facilitating adjustment of the clamping gap to accommodate membrane samples of different thicknesses. After the sample is placed, the perforated docking piece 2 and the lower perforated plexiglass clip 3 are closed by pushing them downwards, forming a stable clamping state. The first sealing ring 4 is fixed to the upper end face of the upper perforated plexiglass clip 1. During clamping, it contacts the sample or docking structure, serving to seal and prevent leakage of the test medium, while also reducing interference from the external environment on the test area. This structure achieves rapid sample loading and reliable clamping through the sliding fit of multiple glass clips, and the sealing ring enhances the sealing performance of the test interface, ensuring stable electrode contact and a controllable test environment during conductivity measurement.

[0021] Furthermore, the lower end of the upper perforated acrylic clip 1 is fixedly connected to a second sealing ring 5, and the upper end of the lower perforated acrylic clip 3 is fixedly connected to a third sealing ring 6. Two sealing ring slots 7 are respectively opened at both ends of the perforated mating piece 2, and the second sealing ring 5 and the third sealing ring 6 are slidably connected in both sealing ring slots 7. The holes 10 of the upper perforated acrylic clip 1, the perforated mating piece 2 and the lower perforated acrylic clip 3 are exactly the same in shape and size.

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] This embodiment provides an ion exchange membrane surface resistance testing device, including a conductivity meter, three perforated acrylic sheets, three elastic sealing gaskets, and an ion exchange membrane. Figure 1 The diagram shows the structure of the conductivity meter 11, including a display screen 12, control buttons 13, wires 14, and electrode test head 15. The conductivity meter needs to be a slotted four-electrode electrode, such as a four-electrode graphite epoxy electrode. A conventional laboratory conductivity meter, model Shangtai 8-244 four-electrode conductivity meter, can be used.

[0024] The three acrylic sheets are an upper perforated acrylic clip 1, a perforated connector 2, and a lower perforated acrylic clip 3, each with a thickness of 1mm. The through hole 10 has a diameter of 5.0mm. The upper and lower ends of the perforated connector 2 have sliding grooves with a width of 0.5mm. The lower end of the upper perforated acrylic clip 1 is inserted into the sliding groove at the upper end of the perforated connector 2, and the upper end of the lower perforated acrylic clip 3 is inserted into the sliding groove at the lower end of the perforated connector 2, thus achieving a sliding connection between the three.

[0025] In this embodiment, all three elastic sealing gaskets are made of nitrile rubber with a cross-sectional diameter of 1.0 mm. The first sealing ring 4 is fixedly connected to the upper edge of the perforated plexiglass clip 1 with adhesive; the second sealing ring 5 is placed in the hole 10 between the upper perforated plexiglass clip 1 and the perforated mating piece 2, located at the joint between the two; the third sealing ring 6 is placed at the lower edge of the lower perforated plexiglass clip 3.

[0026] Place the cut ion exchange membrane (slightly larger than the hole) between the upper perforated acrylic clip 1 and the perforated connector 2, ensuring the membrane completely covers the hole 10; push the upper perforated acrylic clip 1 and the perforated connector 2 to make them fit tightly together, stably clamping the ion exchange membrane; in a 0.5 mol / L NaCl solution, insert the acrylic cell (upper perforated acrylic clip 1, perforated connector 2, ion exchange membrane, and lower perforated acrylic clip 3) into the conductivity electrode slot. At this time, the first sealing ring 4 fits against the inner wall of the upper end of the electrode slot, the third sealing ring 6 fits against the inner wall of the lower end of the electrode slot, and the second sealing ring ensures the seal between the upper perforated acrylic clip 1 and the perforated connector 2, thus forming two mutually isolated chambers within the electrode. Read the conductivity meter reading at this time and record it as σ2. Alternatively, by removing the ion exchange membrane from the plexiglass cell, the conductivity of the 0.5 mol / L NaCl solution without the membrane can be measured and denoted as σ1; by removing the plexiglass cell from the electrode slot, the actual conductivity of the 0.5 mol / L NaCl solution can be measured and denoted as σ.

[0027] The formula for calculating the resistance of an ion exchange membrane is as follows: Rm =

[0028] In the formula: Rm — Film resistance, measured in ohms (Ω); σ² — Film conductivity, measured in millisiemens per centimeter (ms / cm); σ1—Membrane-free conductivity, measured in millisiemens per centimeter (ms / cm); σ—the conductivity of the solution, measured in millisiemens per centimeter (ms / cm); C – Electrode constant, which is 0.27216 in this test system. L – Membrane thickness, in millimeters (mm) S – The area through which the current passes through the membrane, measured in square centimeters (cm²). 2 In this test setup, S is 0.785 cm. 2 The formula for film surface resistance is as follows: Ra = Rm × S Ra — surface resistance, measured in ohms per square centimeter (Ω·cm) 2 ); S—The area of ​​the membrane through which the current passes, expressed in square centimeters (cm²). 2 In this test setup, S is 0.785 cm. 2 Using the equipment of this embodiment, tests were conducted on different ion exchange membrane samples, and the results are shown in Table 1.

[0029] Table 1: Embodiments of this utility model and standard method of HY / T166.1-2013 Data table of surface resistivity of different ion exchange membranes

[0030] As shown in Table 1, the ion exchange membrane surface resistance testing device provided by this utility model provides stable test data that is basically consistent with the values ​​of membrane surface resistance tested in the HY / T166.1-2013 standard.

[0031] In summary, the testing device of this invention can effectively solve the defects of existing devices, is easy to assemble, simple to operate, and provides accurate test data, making it suitable for widespread application in the field of ion exchange membrane performance testing.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. An ion exchange membrane sheet resistance testing device, characterized by: The device includes a conductivity meter, three acrylic sheets, three elastic sealing gaskets, and an ion exchange membrane for testing. The three acrylic sheets include an upper perforated acrylic clip (1), a perforated connector (2), and a lower perforated acrylic clip (3). The perforated connector (2) is slidably connected to the lower end of the upper perforated acrylic clip (1), and the lower perforated acrylic clip (3) is slidably connected to the lower end of the perforated connector (2). The three elastic sealing gaskets include a first sealing ring (4), a second sealing ring (5), and a third sealing ring (6). The sealing ring (4) is fixedly connected to the upper end of the upper perforated plexiglass clip (1), the second sealing ring (5) is located in the hole between the upper perforated plexiglass clip (1) and the perforated mating piece (2), and the third sealing ring (6) is located at the lower end of the lower perforated plexiglass clip (3). Holes (10) are opened through the upper perforated plexiglass clip (1), the perforated mating piece (2) and the lower perforated plexiglass clip (3). The ion exchange membrane is placed between the upper perforated plexiglass clip (1) and the perforated mating piece (2) and can completely cover the holes (10).

2. The ion exchange membrane sheet resistance test device according to claim 1, characterized by, The lower end of the upper perforated plexiglass clip (1) is fixedly connected to a second sealing ring (5), and the upper end of the lower perforated plexiglass clip (3) is fixedly connected to a third sealing ring (6). Two sealing ring slots (7) are respectively opened at both ends of the perforated mating part (2), and the second sealing ring (5) and the third sealing ring (6) are slidably connected in both sealing ring slots (7).

3. The ion exchange membrane sheet resistance test apparatus according to claim 1, characterized by, The holes (10) of the upper perforated acrylic clip (1), the perforated connector (2), and the lower perforated acrylic clip (3) are all identical in shape and size.

4. The ion exchange membrane sheet resistance test apparatus according to claim 1, characterized by The first sealing ring (4), the second sealing ring (5) and the third sealing ring (6) are made of any one of nitrile rubber, fluororubber, silicone rubber, EPDM rubber, chloroprene rubber or polyurethane.

5. The ion exchange membrane sheet resistance test apparatus according to claim 1, characterized by, The cross-sectional diameter of the first sealing ring (4), the second sealing ring (5) and the third sealing ring (6) is 0.5-1.5 mm.

6. The ion exchange membrane sheet resistance test apparatus according to claim 1, characterized by The thickness of the upper perforated acrylic clip (1), the perforated connector (2), and the lower perforated acrylic clip (3) is 1-2 mm.

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