Composite polymer porous material, salt bridge and preparation method thereof

Abstract

The invention discloses a composite polymer porous material, a salt bridge and a preparation method of the composite polymer porous material. The composite polymer porous material comprises the following raw material components in percentage by weight: 60-75% of polysulfone, 5-10% of a dispersing agent, 5-10% of a pore forming agent and 10-15% of a filling agent. Wherein the filling agent is zirconium dioxide. The preparation method comprises the following steps: mixing polysulfone and the dispersing agent, and stirring for 5-8 hours at the speed of 400-600 r / min at the temperature of 30-50 DEG C to prepare first liquid; mixing a pore-forming agent, zirconium dioxide and the first liquid, and stirring to prepare a second liquid; and standing the second liquid for 6-12 hours, and drying to obtain the composite polymer porous material. When the composite polymer porous material is used as a salt bridge, the hydrophilicity, the liquid leakage degree and the durability are superior to those of an existing commercial glass ceramic sand core salt bridge, the low liquid connection potential can be kept at the high temperature, and the use performance is excellent.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrochemical analysis, and particularly relates to a composite polymer porous material, a salt bridge and a preparation method thereof. Background Art

[0002] At present, salt bridges are widely used in aspects such as electrochemical research, analytical chemistry, biochemistry, and environmental monitoring. In electrochemical research, in a two-electrode system, the potential of the working electrode cannot be independently measured or controlled, and the solution resistance significantly affects the test; in a three-electrode system, by introducing a reference electrode (RE), the potential measurement is independent of the current loop, so as to accurately control the potential of the working electrode and compensate for the iR drop. The salt bridge plays a key role in this process. In a three-electrode system, the salt bridge can isolate the electrolytes of the working electrode and the reference electrode, avoid solution mixing and liquid junction potential interference, and ensure that the reference electrode provides a stable potential reference for the working electrode.

[0003] At present, commercial glass ceramic sand cores react with certain alkaline substances such as sodium hydroxide due to the main chemical component silicon dioxide in the sand core itself in a strong alkaline environment, forming soluble silicates, resulting in the dissolution of the sand core. The particle surface of the silica sand may be corroded and weakened, leading to a decrease in alkali resistance. At the same time, corrosion will also be accelerated in a high-temperature environment.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a composite polymer porous material, a salt bridge and a preparation method thereof. The composite polymer porous material has good thermal stability, a long service life and excellent performance.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0007] A composite polymer porous material, comprising the following raw material components in weight percentage: 60% - 75% of polysulfone, 5% - 10% of a dispersant, 5% - 10% of a pore-forming agent, and 10% - 15% of a filler;

[0008] Wherein, the filler is zirconia.

[0009] In one or more embodiments of the present invention, the particle size of the zirconia is 80nm - 120nm.

[0010] In one or more embodiments of the present invention, its pore size is 180nm - 230nm.

[0011] In one or more embodiments of the present invention, the dispersant comprises water and a solvent, and the solvent is selected from N-methylpyrrolidone, N,N-dimethylformamide, and N,N-dimethylacetamide, and the mass ratio of the solvent to water is 1:(25-50).

[0012] In one or more embodiments of the present invention, the pore-forming agent is selected from polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate.

[0013] The technical solution provided by another specific embodiment of the present invention is as follows:

[0014] A method for preparing a composite polymer porous material, comprising the following steps:

[0015] Mix polysulfone and a dispersant, and stir at 400 r / min - 600 r / min for 5 h - 8 h at 30°C - 50°C to prepare a first liquid;

[0016] Mix the pore-forming agent, zirconia and the first liquid, and stir to prepare a second liquid;

[0017] Let the second liquid stand for 6 h - 12 h and then dry it to obtain the composite polymer porous material.

[0018] In one or more embodiments of the present invention, after mixing the pore-forming agent, zirconia and the first liquid, first stir at 800 r / min - 1000 r / min for 24 h - 72 h, and then stir at 100 r / min - 200 r / min for 6 h - 10 h.

[0019] In one or more embodiments of the present invention, the drying is carried out at 120°C - 160°C for 5 h - 6 h.

[0020] The technical solution provided by another specific embodiment of the present invention is as follows:

[0021] A salt bridge, comprising a pipe and a core material located in the pipe, and the core material is made of the above composite polymer porous material.

[0022] The technical solution provided by another specific embodiment of the present invention is as follows:

[0023] A method for preparing a salt bridge, comprising the following steps:

[0024] Mix polysulfone and a dispersant, and stir at 400 r / min - 600 r / min for 5 h - 8 h at 30°C - 50°C to prepare a first liquid;

[0025] Mix the pore-forming agent, zirconia and the first liquid, and stir to prepare a second liquid;

[0026] Let the second liquid stand for 6 h - 12 h to form a coagulated slurry;

[0027] Place the coagulum in the pipe, let it stand for 144 h to 168 h for forming, and then dry it at 120 °C to 160 °C for 5 h to 6 h to obtain the salt bridge.

[0028] Compared with the prior art, the present invention uses polysulfone as the matrix, endowing the composite porous material with excellent heat resistance and corrosion resistance. At the same time, the pore-forming agent is used to make the composite porous material have a certain porosity, and zirconia is combined to make the composite porous material have better ion transport performance. When forming the salt bridge, it can reduce the liquid junction potential and maintain the stability of the liquid junction potential, effectively improving the service performance of the salt bridge. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 SEM image of the composite polymer porous material in Example 1 of the present invention;

[0031] Figure 2 Pore size distribution diagram of the composite polymer porous material in Example 1 of the present invention;

[0032] Figure 3 Flow-pressure curve diagram of the composite polymer porous material in Example 1 of the present invention;

[0033] Figure 4 Leakage rate curve diagram of the salt bridges in Example 1 of the present invention and Comparative Example 1;

[0034] Figure 5 Liquid junction potential curve diagram of the salt bridges in Example 1 of the present invention and Comparative Example 1. Detailed Embodiments

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] A specific embodiment of the present invention provides a composite polymer porous material, which comprises the following raw material components in weight percentages: 60% - 75% of polysulfone, 5% - 10% of a dispersant, 5% - 10% of a pore former, and 10% - 15% of a filler; wherein, the filler is zirconia.

[0037] Specifically, polysulfone has excellent high-temperature resistance. At high temperatures, it has excellent dimensional stability, excellent heat aging resistance, and good acid and alkali corrosion resistance, which can significantly increase the service life of the composite polymer porous material and reduce costs. An appropriate amount of pore former can make the composite polymer porous material have pores with a certain porosity, which is helpful for ion transport. Zirconia is selected as the filler, which has hydrophilicity, can make the composite polymer porous material have a certain wettability, can improve the ion migration efficiency, and zirconia has excellent corrosion resistance and thermal stability, which can improve the life of the composite polymer porous material. When used as a salt bridge, it can improve the ion transport performance.

[0038] Further, the particle size of zirconia is 80nm - 120nm.

[0039] Specifically, too large a particle size of zirconia will hinder ion transport and increase the liquid junction potential, while too small a particle size will cause the solution to penetrate too fast. Therefore, by controlling the particle size, the service performance of the composite polymer porous material can be improved.

[0040] Further, the pore size of the composite polymer porous material is 180nm - 230nm.

[0041] Specifically, an appropriate pore size can provide a stable ion transport channel and improve the stability of the composite polymer porous material during use. If the pore size is too large, it is easy to increase the risk of liquid leakage and affect ion transport. If the pore size is too small, the ion transport efficiency will decrease, and even the transport interruption phenomenon will occur.

[0042] Further, the dispersant comprises water and a solvent, and the solvent is selected from N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide. The mass ratio of the solvent to water is 1:(25 - 50). The pore former is selected from polyvinylpyrrolidone, polyethylene glycol, sodium dodecyl sulfate. Preferably, the pore former comprises polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1.

[0043] Another specific embodiment of the present invention provides a preparation method of a composite polymer porous material, which comprises the following steps 1 - 3.

[0044] Step 1, mix polysulfone and the dispersant, heat and stir to make a first liquid.

[0045] Specifically, the heating and stirring is carried out at 30°C to 50°C with stirring at 400 r / min to 600 r / min for 5 h to 8 h. By heating, the polysulfone is dissolved in the dispersant, and combined with stirring, a uniformly mixed first liquid is prepared.

[0046] Step 2: Mix the pore-forming agent, zirconia and the first liquid, and stir to prepare a second liquid.

[0047] Specifically, after mixing the pore-forming agent, zirconia and the first liquid, first stir at 800 r / min to 1000 r / min for 24 h to 72 h to completely disperse and homogenize the mixture. Then, carry out ultrasonic stirring at 100 r / min to 200 r / min for 6 h to 10 h for degassing treatment to discharge the bubbles in the system.

[0048] Step 3: Let the second liquid stand and dry to obtain a composite polymer porous material.

[0049] Specifically, let the second liquid stand for 6 h to 12 h to form a coagulated slurry state, and then dry at 120°C to 160°C for 5 h to 6 h. Appropriate drying temperature and time can ensure the integrity of the pores in the composite porous material. If the temperature is too high, the pores may be deformed or closed, reducing the porosity. If the temperature is too low, uneven pores are likely to be formed, which will affect ion transport.

[0050] Another specific embodiment of the present invention provides a salt bridge, which includes a pipe and a core material located in the pipe, and the core material is made of the above composite polymer porous material.

[0051] Specifically, the pipe can be made of common materials, such as glass tubes and plastic tubes.

[0052] Another specific embodiment of the present invention provides a preparation method of a salt bridge, including the following steps: Mix polysulfone and a dispersant, stir at 400 r / min to 600 r / min at 30°C to 50°C for 5 h to 8 h to prepare a first liquid; Mix the pore-forming agent, zirconia and the first liquid, and stir to prepare a second liquid; Let the second liquid stand for 6 h to 12 h to form a coagulated slurry; Place the coagulated slurry in the pipe, let it stand for 144 h to 168 h to form, and then dry at 120°C to 160°C for 5 h to 6 h to obtain the salt bridge.

[0053] Specifically, the size of the salt bridge can be controlled according to actual needs. For example, place the coagulated slurry in the pipe and let it stand to form, and control the diameter to be 2 nm to 4 nm and the thickness (i.e., the height of the core material in the pipe) to be 5 to 7 mm.

[0054] The following further elaborates the present invention in detail with specific embodiments.

[0055] In the present invention, the raw material polysulfone used is ordinary bisphenol A type with a molecular weight of 20,000 - 40,000 g / mol; the polyvinylpyrrolidone has the model K - 30, and the polyethylene glycol has the model PEG - 200. Other raw materials can be obtained through commercial channels.

[0056] Example 1

[0057] Take 715 g of polysulfone and dissolve it in 83 g of a dispersant. The dispersant is composed of N - methylpyrrolidone and water with a mass ratio of 1:30. Stir at 40 °C at 500 r / min for 5 h until a uniformly mixed viscous solution is formed, and then stop stirring. Then add 126 g of zirconia with a particle size of 100 nm and 76 g of a pore - forming agent to the viscous solution. The pore - forming agent is composed of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min, and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0058] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 6 mm and a diameter of 2 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a composite polymer porous material.

[0059] Figure 1 This is the SEM image (magnification ×5000) of the composite polymer porous material. Refer to GB / T32361 - 2015 "Test Methods for Pore Size of Separation Membranes - Bubble Point and Mean Flow Rate Method" to test the pore size of the composite polymer porous material in this example. As Figure 2 and Figure 3 shown, the measured average pore size is 216 nm.

[0060] Take another portion of the slurry, let it stand for 10 h to form a coagulated slurry state, extrude it into a pipe as the core material through injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 6 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a salt bridge.

[0061] Example 2

[0062] Take 723 g of polysulfone and dissolve it in 77 g of a dispersant. The dispersant consists of N-methylpyrrolidone and water with a mass ratio of 1:30. Stir at 500 r / min at 40 °C for 5 h until a uniformly mixed viscous solution is formed, and then stop stirring. Then add 137 g of zirconia with a particle size of 100 nm and 63 g of a pore-forming agent to the viscous solution. The pore-forming agent consists of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0063] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 6 mm and a diameter of 2 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a composite polymer porous material.

[0064] Take another portion of the slurry and let it stand for 10 h to form a coagulated slurry state. Extrude it into a pipe as the core material by injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 6 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a salt bridge.

[0065] Example 3

[0066] Take 697 g of polysulfone and dissolve it in 91 g of a dispersant. The dispersant consists of N-methylpyrrolidone and water with a mass ratio of 1:30. Stir at 500 r / min at 40 °C for 5 h until a uniformly mixed viscous solution is formed, and then stop stirring. Then add 130 g of zirconia with a particle size of 100 nm and 82 g of a pore-forming agent to the viscous solution. The pore-forming agent consists of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0067] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 6 mm and a diameter of 2 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a composite polymer porous material.

[0068] Take another portion of the slurry and let it stand for 10 h to form a coagulated slurry state. Extrude it into a pipe as the core material by injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 6 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a salt bridge.

[0069] Example 4

[0070] Take 667 g of polysulfone and dissolve it in 88 g of a dispersant. The dispersant consists of N-methylpyrrolidone and water with a mass ratio of 1:30. Stir at 500 r / min for 5 h at 40 °C until a uniformly mixed viscous solution is formed, and then stop stirring. Then add 177 g of zirconia with a particle size of 100 nm and 68 g of a pore-forming agent to the viscous solution. The pore-forming agent consists of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0071] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 6 mm and a diameter of 2 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a composite polymer porous material.

[0072] Take another portion of the slurry and let it stand for 10 h to form a coagulated slurry state. Extrude it into a pipe as the core material through injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 6 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a salt bridge.

[0073] Example 5

[0074] Take 715 g of polysulfone and dissolve it in 83 g of a dispersant. The dispersant consists of N-methylpyrrolidone and water with a mass ratio of 1:30. Stir at 500 r / min for 5 h at 40 °C until a uniformly mixed viscous solution is formed, and then stop stirring. Then add 126 g of zirconia with a particle size of 100 nm and 76 g of a pore-forming agent to the viscous solution. The pore-forming agent consists of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0075] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 5 mm and a diameter of 2 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a composite polymer porous material.

[0076] Take another portion of the slurry and let it stand for 10 h to form a coagulated slurry state. Extrude it into a pipe as the core material through injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 5 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a salt bridge.

[0077] Example 6

[0078] Dissolve 715 g of polysulfone in 83 g of a dispersant. The dispersant consists of N-methylpyrrolidone and water with a mass ratio of 1:30. Stir at 500 r / min at 40 °C for 5 h until a uniformly mixed viscous solution is formed, then stop stirring. Then add 126 g of zirconia with a particle size of 100 nm and 76 g of a pore-forming agent to the viscous solution. The pore-forming agent consists of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0079] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 7 mm and a diameter of 2 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a composite polymer porous material.

[0080] Take another portion of the slurry and let it stand for 10 h to form a coagulated slurry state. Extrude it into a pipe as the core material by injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 7 mm, and then place it in an oven at 150 °C and dry for 5 h to obtain a salt bridge.

[0081] Example 7

[0082] Dissolve 715 g of polysulfone in 83 g of a dispersant. The dispersant consists of N-methylpyrrolidone and water with a mass ratio of 1:30. Stir at 500 r / min at 40 °C for 5 h until a uniformly mixed viscous solution is formed, then stop stirring. Then add 126 g of zirconia with a particle size of 100 nm and 76 g of a pore-forming agent to the viscous solution. The pore-forming agent consists of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0083] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 6 mm and a diameter of 2 mm, and then place it in an oven at 120 °C and dry for 5 h to obtain a composite polymer porous material.

[0084] Take another portion of the slurry and let it stand for 10 h to form a coagulated slurry state. Extrude it into a pipe as the core material by injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 6 mm, and then place it in an oven at 120 °C and dry for 5 h to obtain a salt bridge.

[0085] Example 8

[0086] Take 715 g of polysulfone and dissolve it in 83 g of a dispersant. The dispersant consists of N-methylpyrrolidone and water with a mass ratio of 1:30. Stir at 500 r / min at 40 °C for 5 h until a uniformly mixed viscous solution is formed, then stop stirring. Then add 126 g of zirconia with a particle size of 100 nm and 76 g of a pore-forming agent to the viscous solution. The pore-forming agent consists of polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate with a mass ratio of 2:2:1. Stir at 800 r / min for 48 h until the mixture is completely and uniformly dispersed. Finally, adjust the stirring speed to 100 r / min and perform degassing treatment by ultrasonic stirring for 8 h until there are no bubbles left, obtaining a slurry.

[0087] Let the slurry stand for 10 h to form a coagulated slurry state, place it in a cylindrical mold with a height of 6 mm and a diameter of 2 mm, and then place it in an oven at 160 °C and dry for 6 h to obtain a composite polymer porous material.

[0088] Take another portion of the slurry and let it stand for 10 h to form a coagulated slurry state. Extrude it into a pipe as the core material through injection molding, let it stand for 144 h to form, the core material in the pipe has a diameter of 2 mm and a thickness of 6 mm, and then place it in an oven at 160 °C and dry for 6 h to obtain a salt bridge.

[0089] Comparative Example 1

[0090] Use a commercial ceramic core salt bridge as this comparative example.

[0091] Performance Testing

[0092] Hydrophilicity: Fix the test material on the contact angle tester stage, adjust the height and position of the test liquid dropper to ensure that the liquid can accurately drop on the material surface. Start the test equipment, let the test liquid drop on the material surface, and observe the droplet shape formed by the liquid on the material surface. Use the software or manual measurement tool attached to the test equipment to measure the contact angle between the droplet and the material surface. Record the contact angle data for each test.

[0093] Leakage rate: Fill the commercial ceramic core salt bridge and the salt bridge of the example with pure water and place them in 30% KOH at 80 °C. Take a time interval of 24 hours, and record the volume of the solution whose liquid level drops within 24 hours for each, denoted as V1 and V2 respectively, to obtain the leakage rates of the commercial ceramic core salt bridge and the salt bridge of the example.

[0094] Durability: Use an electrochemical workstation, select a saturated calomel reference electrode, 30% KOH solution at 80 °C, and test the open-circuit voltage of the salt bridge in the example and the voltage after long-term use under a three-electrode system, and compare with the commercial ceramic core salt bridge. Take a time interval of 24 hours, and record the liquid junction potential and the longest service time respectively.

[0095] Table 1 Performance Test Results

[0096]

[0097] Combined with Table 1, Figure 4 and Figure 5 , compared with Comparative Example 1, the hydrophilicity of the salt bridge in the embodiment of the present invention is better than that of Comparative Example 1, the degree of liquid leakage is overall better than that of Comparative Example 1, and in terms of durability, it can maintain a low and stable liquid junction potential during long-term use, which is more conducive to ion transport and shows excellent performance in use.

[0098] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0099] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite polymer porous material, characterized in that: The method comprises the following raw material components in weight percentage: 60% to 75% polysulfone, 5% to 10% dispersant, 5% to 10% pore-forming agent, and 10% to 15% filler; Wherein, the filler is zirconium dioxide.

2. The composite polymer porous material according to claim 1, characterized in that: The particle size of the zirconium dioxide is 80nm-120nm.

3. The composite polymer porous material according to claim 1, characterized in that: The pore size is 180nm~230nm.

4. The composite polymer porous material according to claim 1, characterized in that: The dispersant includes water and a solvent, the solvent is selected from N-methylpyrrolidone, N,N-dimethylformamide, and N,N-dimethylacetamide, and the mass ratio of the solvent to water is 1:(25-50).

5. The composite polymer porous material according to claim 1, characterized in that: The pore-forming agent is selected from polyvinyl pyrrolidone, polyethylene glycol, and sodium lauryl sulfate.

6. A method for preparing a composite polymer porous material, characterized in that: The steps include: The polysulfone and the dispersant are mixed, and stirred at 400 rpm to 600 rpm for 5 to 8 hours at 30 to 50 ℃ to prepare a first liquid; Mixing the pore former, zirconium dioxide and the first liquid, and stirring to form a second liquid; The second liquid is allowed to stand for 6 hours to 12 hours and dried to obtain a composite polymer porous material.

7. The method for preparing a composite polymer porous material according to claim 6, characterized in that: After the pore former, zirconium dioxide and the first liquid are mixed, they are first stirred at 800 r / min to 1000 r / min for 24 h to 72 h, and then stirred at 100 r / min to 200 r / min for 6 h to 10 h.

8. The method for preparing a composite polymer porous material according to claim 6, characterized in that: The drying is carried out at 120° C. to 160° C. for 5 h to 6 h.

9. A salt bridge, characterized in that The invention comprises a tube and a core material located in the tube, wherein the core material is made of the composite polymer porous material according to any one of claims 1 to 5 or a composite polymer porous material prepared by the preparation method of the composite polymer porous material according to any one of claims 6 to 8.

10. A method for preparing the salt bridge according to claim 9, characterized in that: The steps include: The polysulfone and the dispersant are mixed, and stirred at 400 rpm to 600 rpm for 5 to 8 hours at 30 to 50 ℃ to prepare a first liquid; Mixing the pore former, zirconium dioxide and the first liquid, and stirring to form a second liquid; The second liquid is allowed to stand for 6 to 12 hours to form a slurry; The slurry is placed in a pipe, left to stand for 144 to 168 hours to form, and then dried at 120 to 160°C for 5 to 6 hours to obtain a salt bridge.

Images