CN111733602B - Preparation method of PPS/MOFs micro-nanofiber alkaline water electrolyzer diaphragm - Google Patents
Preparation method of PPS/MOFs micro-nanofiber alkaline water electrolyzer diaphragm Download PDFInfo
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
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- C25B13/00—Diaphragms; Spacing elements
- C25B13/04—Diaphragms; Spacing elements characterised by the material
- C25B13/08—Diaphragms; Spacing elements characterised by the material based on organic materials
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
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Abstract
The invention discloses a preparation method of a PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm, which comprises the steps of preparing PPS melt-blown fabric from dried PPS resin by melt-blowing equipment; carrying out hydrophilic modification on the PPS melt-blown fabric; modifying the PPS melt-blown fabric subjected to hydrophilic modification by adopting alkali-resistant hydrophilic MOFs; and (3) carrying out hot pressing on the PPS melt-blown fabric modified by the MOFs, and then rapidly cooling to obtain the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm. According to the invention, a hydrophilic ZIF-90 modification mode is adopted, so that the hydrophilicity and the alkali absorption rate are improved, and the three-dimensional pore structure of the MOFs material of the ZIF-90 can effectively prevent gas molecules from permeating, so that the gases generated at two poles cannot permeate and mix with each other in the water electrolysis process, and the purity of the gases is ensured.
Description
Technical Field
The invention relates to the field of hydrogen production by water electrolysis, in particular to a preparation method of a PPS/MOFs micro-nanofiber alkaline water electrolyzer diaphragm.
Background
Energy is an important factor for human survival and development, and is an important material basis and guarantee for national economic and social development. Since the first industrial revolution, fossil energy has become the most important energy for human beings, but the increasing exhaustion of fossil energy causes energy shortage, and the utilization of fossil energy also causes irreversible environmental pollution. Therefore, the vigorous development of renewable clean energy is crucial to the environmental protection and the development of the world economy. The hydrogen energy as energy-containing energy source has the advantages of wide source, cyclic utilization, high energy density, cleanness and the like. Therefore, the development of hydrogen energy is an effective way to reduce the consumption of fossil energy, protect the environment and promote the sustainable development of human society.
The hydrogen production by the alkaline water electrolyzer is the most mature hydrogen production technology by water electrolysis so far, and has the advantages of simple operation and high efficiency, so that the hydrogen production by the alkaline water electrolyzer can be widely applied to the industry. The alkaline water electrolyzer mainly comprises electrodes and a diaphragm, and the inside of the electrolyzer is divided into an anode small chamber and a cathode small chamber which are separated by the diaphragm. The electrolytic bath is filled with electrolyte, and because pure water has poor conductivity, electrolyte with good conductivity needs to be added, and the electrolyte is usually 30-40% KOH or NaOH solution. During electrolysis, the anode generates oxygen and the cathode generates hydrogen, and the diaphragm prevents the mixing of the hydrogen and the oxygen. At present, asbestos cloth is mainly adopted as the diaphragm, but the swelling property and chemical instability of the asbestos diaphragm cause the defect that the pure asbestos diaphragm has serious swelling in a specific operating environment, particularly under a high current load, so that the mechanical strength of the diaphragm is reduced, and the service life of the diaphragm is shortened.
Polyphenylene Sulfide (PPS) as a novel film material is a thermoplastic resin, has excellent high temperature resistance, solvent resistance, acid and alkali corrosion resistance, radiation resistance, flame retardance and good mechanical property and electrical property, has wide application in the fields of electronics, automobiles, machinery and chemical industry, and is known as 'sixth engineering plastic'. PPS material has almost no solvent to dissolve at 200 ℃, so the PPS material can be used in acid, alkali and organic solvents for a long time at high temperature, so the PPS material can be directly used as a membrane material for treating the organic solvent. The PPS has the decomposition temperature of more than 450 ℃ in the air, the long-term use temperature of about 200 ℃, can stand the high temperature of 260 ℃ in a short term, and has better thermal stability.
The fabric has been used as the diaphragm of the alkaline water electrolyzer for a long time, but is influenced by the hydrophilicity, so that the conductivity is low, the conductivity is influenced, and the energy consumption is high, so researchers try to improve the alkali absorption rate and further improve the conductivity by carrying out hydrophilic modification on the fabric. For polyphenylene sulfide fibers, a hydrophilic modification method is usually to sulfonate the polyphenylene sulfide fibers in 98% -99% high-temperature concentrated sulfuric acid. The method has the advantages of quick modification and good modification effect, the obtained modified fiber has strong hydrophilicity, however, the high-concentration sulfuric acid is not beneficial to industrial production, and a large amount of water resources are needed for cleaning the modified fiber, so that the resources are wasted, and the generated sulfuric acid wastewater is difficult to treat and pollutes the environment.
It is necessary to have good and stable airtightness in view of the long-term stable operation of the fibrous membrane, so that the passage of gas molecules and bubbles is prevented, thereby effectively preventing the anode-side gas and the cathode-side gas from being mixed with each other, thereby ensuring the gas purity. The density of the fibers of the diaphragm determines the quality of air tightness, and the common operation mode is to increase the density of the fibers and reduce the average pore diameter, which tends to increase the thickness of the film and increase the surface resistance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problem of providing a preparation method of a PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm.
The invention provides a preparation method of a PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm, which is characterized by comprising the following steps:
1) preparing PPS melt-blown fabric from the dried PPS resin through melt-blown equipment;
2) carrying out hydrophilic modification on the PPS melt-blown fabric;
3) modifying the hydrophilic modified PPS melt-blown fabric by adopting alkali-resistant hydrophilic MOFs:
dissolving imidazole-2-formaldehyde into deionized water to prepare an imidazole-2-formaldehyde solution with the mass fraction of 0.2% -2.5%; dissolving polyvinylpyrrolidone in imidazole-2-formaldehyde solution to obtain solution A; the mass fraction of the polyvinylpyrrolidone in the solution A is 0.1-2%;
dissolving zinc nitrate in tert-butyl alcohol to prepare a zinc nitrate solution with the mass fraction of 0.5-3%;
uniformly mixing the solution A and the zinc nitrate solution with the same volume, quickly immersing the PPS melt-blown fabric subjected to hydrophilic modification into the solution A, sealing the solution A, reacting the solution A at normal temperature for 15-90min, and drying the reaction product to obtain the MOFs modified PPS melt-blown fabric;
4) and (3) carrying out hot pressing on the PPS melt-blown fabric modified by the MOFs, and then rapidly cooling to obtain the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts weak amination mode to treat PPS fiber, which can make the fiber reach super-hydrophilic state, save a great deal of water in post-treatment operation and keep the mechanical property of the fiber.
(2) According to the invention, a hydrophilic ZIF-90 modification mode is adopted, so that the hydrophilicity and the alkali absorption rate are improved, and the three-dimensional pore structure of the MOFs material of the ZIF-90 can effectively prevent gas molecules from permeating, so that the gases generated at two poles cannot permeate and mix with each other in the water electrolysis process, and the purity of the gases is ensured. In addition, the high porosity of the modified diaphragm can improve the porosity of the whole modified diaphragm, thereby reducing the surface resistance of the modified diaphragm.
(3) Polyphenylene sulfide fibers are traditional insulating materials, the electric conductivity of the polyphenylene sulfide fibers is poor, the polyphenylene sulfide fibers are mainly conducted through electrolyte in the water electrolysis process, and even if the diaphragm has small surface resistance, the loss of electric quantity can be caused, so that the energy consumption is increased. The MOFs material is prepared by complexing metal ions with organic monomers and has good conductivity. The MOFs material is used for modifying the PPS melt-blown fiber, so that the conductivity of the diaphragm can be effectively improved, and the energy consumption is reduced.
Detailed Description
Specific examples of the present invention are given below. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
The invention provides a preparation method (method for short) of a PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm, which is characterized by comprising the following steps:
1) continuously drying the PPS resin at the temperature of 60-120 ℃ for 12h until the PPS resin is completely dried, and preparing PPS melt-blown fabric by single-screw melt-blown equipment;
in the step 1), the melt-blown process parameters are as follows: the temperature of each heating section of the melt-blowing equipment is 275 ℃, 330 ℃ and 330 ℃, the temperature of the pipeline is 320 ℃, the temperature of the metering pump is 330 ℃, the temperature of the spinning nozzle is 290 ℃ and 320 ℃, and the air volume of the hot air is 0.70-0.9m3The supply amount of a metering pump is 98-120g/min, and the receiving distance is 23-32 cm.
The PPS resin adopts melt-blown PPS resin; the gram weight of the PPS melt-blown fabric is 30-120g/m2The diameter of the melt-blown fabric is 3-5 μm;
2) carrying out hydrophilic modification on the PPS melt-blown fabric; the hydrophilic modification can adopt weak amination treatment, plasma treatment, ozone modification, fuming sulfuric acid modification or chlorosulfonic acid modification and the like;
the weak amination treatment comprises the following steps: soaking PPS melt-blown fabric in a nitric acid solution with the temperature of 50 ℃ and the mass fraction of 33% -34% for 20-100min, taking out the PPS melt-blown fabric, washing the PPS melt-blown fabric with deionized water until the washing liquid is neutral, and continuously drying the PPS melt-blown fabric in a vacuum environment at the temperature of 50-70 ℃ for more than 12h until the PPS melt-blown fabric is completely dried;
3) modifying the PPS melt-blown fabric subjected to hydrophilic modification by adopting alkali-resistant hydrophilic MOFs;
dissolving imidazole-2-formaldehyde into deionized water to prepare an imidazole-2-formaldehyde solution with the mass fraction of 0.2% -2.5% (preferably 1% -1.5%); adding polyvinylpyrrolidone into the imidazole-2-formaldehyde solution, and stirring (preferably mechanically stirring)
Dissolving for 10-20min to obtain solution A; the mass fraction of the polyvinylpyrrolidone in the solution A is 0.1-2%;
dissolving zinc nitrate in tert-butyl alcohol to prepare a zinc nitrate solution with the mass fraction of 0.5-3%;
quickly and uniformly stirring the solution A and the zinc nitrate solution with the same volume, quickly immersing the PPS meltblown subjected to hydrophilic modification in the solution A, sealing the solution A, reacting at normal temperature for 15-90min (preferably 30min), and continuously drying the PPS meltblown in a vacuum environment at 50-70 ℃ for more than 12h until the PPS meltblown is completely dried to obtain the MOFs modified PPS meltblown with different MOFs;
the dissolution in the step 3) is preferably stirred for dissolution; the stirring is mechanical stirring, magnetic stirring or ultrasonic dispersion and the like;
the MOFs are all strong-base-resistant hydrophilic MOFs, such as ZIF-90 and the like.
4) PPS melt-blown cloth after MOFs is modified carries out the hot pressing after, places in normal atmospheric temperature deionized water rapidly and carries out the rapid cooling (the rapid cooling is in order to maintain the fibrous mechanical properties of PPS, and the normal atmospheric temperature cooling can lead to the crystallinity to increase, and mechanical properties descends, and the rapid cooling can lead to the crystallinity lower, and mechanical properties is better), obtains the micro-nano fibrous alkaline water electrolysis trough diaphragm of PPS/MOFs.
In the step 4), the hot pressing process parameters are 50-120 ℃ (preferably 80 ℃), 1.0-5.0MPa (preferably 5.0MPa), and 10-60s (preferably 30-60s) of hot pressing time.
The test method comprises the following steps: (1) the gram weight was measured by the density method according to JIS L1096-2018, i.e., 3 test pieces of 20 cm. times.20 cm were cut out in a standard state, each piece was weighed in a standard state, and the weight was calculated according to the following formula: the gram weight of each test piece was determined as mass/area, and the average value was taken. (2) The air tightness is determined according to the air tightness performance of the Chinese building material industry standard JC/T211-2009. (3) The water absorption is measured according to the regulations in the national standard GB/T21655.1-2008. (4) The mean pore diameter is determined using a capillary flow porosimeter (Porolux 1000).
Example 1
(1) Preparing PPS melt-blown fabric from the dried PPS resin by single-screw melt-blown equipment;
(2) cutting a plurality of (3 pieces in the embodiment) PPS melt-blown fabrics with uniform size and thickness, putting the PPS melt-blown fabrics into a nitric acid solution with the concentration of 33-34%, heating to 50 ℃ for treatment for 30min, taking out the PPS melt-blown fabrics, washing the PPS melt-blown fabrics with deionized water until the washing liquid is neutral, and drying the PPS melt-blown fabrics in a vacuum environment at the temperature of 60 ℃ for 12 h;
(3) weighing 0.12g of imidazole-2-formaldehyde and dissolving in 10mL of deionized water; then adding 0.1g of polyvinylpyrrolidone and stirring for 10min to obtain a solution A;
weighing 0.05g of zinc nitrate, stirring and dissolving in 10mL of tert-butyl alcohol to obtain a zinc nitrate solution;
rapidly and uniformly stirring the solution A and a zinc nitrate solution, rapidly immersing the PPS melt-blown fabric subjected to hydrophilic modification in the solution A, sealing the solution A, reacting the solution at normal temperature for 30min, and drying the reaction product in a vacuum environment at 60 ℃ for 12h to obtain ZIF-90 modified PPS melt-blown fabric;
(4) hot-pressing the ZIF-90 modified PPS melt-blown fabric, wherein the hot-pressing technological parameters are 80 ℃, 3MPa and the duration is 60 s; rapidly placing the hot-pressed PPS melt-blown fabric into normal-temperature deionized water for rapid cooling to obtain an electrolytic cell diaphragm; testing was performed after complete drying.
The average pore diameter of the electrolytic cell diaphragm is 5.5 mu m and the gram weight is 78g/m2The air tightness is 680mmH2O, water absorption of 95%.
Example 2
(1) Preparing PPS melt-blown fabric from the dried PPS resin by single-screw melt-blown equipment;
(2) cutting a plurality of (3 pieces in the embodiment) PPS melt-blown fabrics with uniform size and thickness, putting the PPS melt-blown fabrics into a nitric acid solution with the concentration of 33-34%, heating to 50 ℃, treating for 60min, taking out, washing with deionized water until the washing liquid is neutral, and drying in a vacuum environment at the temperature of 60 ℃ for 12 h;
(3) weighing 0.12g of imidazole-2-formaldehyde and dissolving in 10mL of deionized water; then adding 0.1g of polyvinylpyrrolidone and stirring for 10min to obtain a solution A;
weighing 0.05g of zinc nitrate, stirring and dissolving in 10mL of tert-butyl alcohol to obtain a zinc nitrate solution;
rapidly and uniformly stirring the solution A and a zinc nitrate solution, rapidly immersing the PPS melt-blown fabric subjected to hydrophilic modification in the solution A, sealing the solution A, reacting the solution at normal temperature for 30min, and drying the reaction product in a vacuum environment at 60 ℃ for 12h to obtain ZIF-90 modified PPS melt-blown fabric;
(4) hot-pressing the ZIF-90 modified PPS melt-blown fabric, wherein the hot-pressing technological parameters are 80 ℃, 3MPa and the duration is 30 s; and quickly placing the hot-pressed PPS melt-blown fabric into normal-temperature deionized water for quick cooling to obtain an electrolytic cell diaphragm, and testing after the diaphragm is completely dried.
The test shows that the average pore diameter of the diaphragm of the electrolytic cell is 3.8 mu m, and the gram weight is 83.5g/m2Airtightness is 475mmH2O, water absorption of 108%.
Example 3
(1) Preparing PPS melt-blown fabric from the dried PPS resin by single-screw melt-blown equipment;
(2) cutting a plurality of (3 pieces in the embodiment) PPS melt-blown fabrics with uniform size and thickness, putting the PPS melt-blown fabrics into a nitric acid solution with the concentration of 33-34%, heating to 50 ℃ for treatment for 30min, taking out the PPS melt-blown fabrics, washing the PPS melt-blown fabrics with deionized water until the washing liquid is neutral, and drying the PPS melt-blown fabrics in a vacuum environment at the temperature of 60 ℃ for 12 h;
(3) weighing 0.12g of imidazole-2-formaldehyde and dissolving in 10mL of deionized water; then adding 0.1g of polyvinylpyrrolidone and stirring for 10min to obtain a solution A;
weighing 0.2g of zinc nitrate, stirring and dissolving in 10mL of tert-butyl alcohol to obtain a zinc nitrate solution;
rapidly and uniformly stirring the solution A and a zinc nitrate solution, rapidly immersing the PPS melt-blown fabric subjected to hydrophilic modification in the solution A, sealing the solution A, reacting the solution at normal temperature for 30min, and drying the reaction product in a vacuum environment at 60 ℃ for 12h to obtain ZIF-90 modified PPS melt-blown fabric;
(4) hot-pressing the ZIF-90 modified PPS melt-blown fabric, wherein the hot-pressing technological parameters are 80 ℃, 5MPa and the duration is 30 s; and quickly placing the hot-pressed PPS melt-blown fabric into normal-temperature deionized water for quick cooling to obtain an electrolytic cell diaphragm, and testing after the diaphragm is completely dried.
The test shows that the average pore diameter of the diaphragm of the electrolytic cell is 4.2 mu m, and the gram weight is 82g/m2The airtightness is 420mmH2O, water absorption of 112%.
Example 4
(1) Preparing PPS melt-blown fabric from the dried PPS resin by single-screw melt-blown equipment;
(2) cutting a plurality of (3 pieces in the embodiment) PPS melt-blown fabrics with uniform size and thickness, putting the PPS melt-blown fabrics into a nitric acid solution with the concentration of 33-34%, heating to 50 ℃, treating for 60min, taking out, washing with deionized water until the washing liquid is neutral, and drying in a vacuum environment at the temperature of 60 ℃ for 12 h;
(3) weighing 0.12g of imidazole-2-formaldehyde and dissolving in 10mL of deionized water; then adding 0.1g of polyvinylpyrrolidone and stirring for 10min to obtain a solution A;
weighing 0.15g of zinc nitrate, stirring and dissolving in 10mL of tert-butyl alcohol to obtain a zinc nitrate solution;
rapidly and uniformly stirring the solution A and a zinc nitrate solution, rapidly immersing the PPS melt-blown fabric subjected to hydrophilic modification in the solution A, sealing the solution A, reacting the solution at normal temperature for 30min, and drying the reaction product in a vacuum environment at 60 ℃ for 12h to obtain ZIF-90 modified PPS melt-blown fabric;
(4) hot-pressing the ZIF-90 modified PPS melt-blown fabric, wherein the hot-pressing technological parameters are 80 ℃, 5MPa and 60s of duration; and quickly placing the hot-pressed PPS melt-blown fabric into normal-temperature deionized water for quick cooling to obtain an electrolytic cell diaphragm, and testing after the diaphragm is completely dried.
Tests show that the average pore diameter of the diaphragm of the electrolytic cell is 4.4 mu m, and the gram weight is 89g/m2The airtightness is 462mmH2O, water absorption of 103%.
Example 5
(1) Preparing PPS melt-blown fabric from the dried PPS resin by single-screw melt-blown equipment;
(2) cutting a plurality of (3 pieces in the embodiment) PPS melt-blown fabrics with uniform size and thickness, putting the PPS melt-blown fabrics into a nitric acid solution with the concentration of 33-34%, heating to 50 ℃, treating for 60min, taking out, washing with deionized water until the washing liquid is neutral, and drying in a vacuum environment at the temperature of 60 ℃ for 12 h;
(3) weighing 0.12g of imidazole-2-formaldehyde and dissolving in 10mL of deionized water; then adding 0.1g of polyvinylpyrrolidone and stirring for 10min to obtain a solution A;
weighing 0.3g of zinc nitrate, stirring and dissolving in 10mL of tert-butyl alcohol to obtain a zinc nitrate solution;
rapidly and uniformly stirring the solution A and a zinc nitrate solution, rapidly immersing the PPS melt-blown fabric subjected to hydrophilic modification in the solution A, sealing the solution A, reacting the solution at normal temperature for 30min, and drying the reaction product in a vacuum environment at 60 ℃ for 12h to obtain ZIF-90 modified PPS melt-blown fabric;
(4) hot-pressing the ZIF-90 modified PPS melt-blown fabric, wherein the hot-pressing technological parameters are 80 ℃, 5MPa and 60s of duration; and quickly placing the hot-pressed PPS melt-blown fabric into normal-temperature deionized water for quick cooling to obtain an electrolytic cell diaphragm, and testing after the diaphragm is completely dried.
The test shows that the diaphragm of the electrolytic cell is averageThe pore diameter is 5.2 mu m, and the gram weight is 87g/m2The airtightness is 387mmH2O, water absorption of 117%.
Nothing in this specification is said to apply to the prior art.
Claims (10)
1. A preparation method of a PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm is characterized by comprising the following steps:
1) preparing PPS melt-blown fabric from the dried PPS resin through melt-blown equipment;
2) carrying out hydrophilic modification on the PPS melt-blown fabric;
3) modifying the hydrophilic modified PPS melt-blown fabric by adopting alkali-resistant hydrophilic MOFs:
dissolving imidazole-2-formaldehyde into deionized water to prepare an imidazole-2-formaldehyde solution with the mass fraction of 0.2% -2.5%; dissolving polyvinylpyrrolidone in imidazole-2-formaldehyde solution to obtain solution A; the mass fraction of the polyvinylpyrrolidone in the solution A is 0.1-2%;
dissolving zinc nitrate in tert-butyl alcohol to prepare a zinc nitrate solution with the mass fraction of 0.5-3%;
uniformly mixing the solution A and the zinc nitrate solution with the same volume, quickly immersing the PPS melt-blown fabric subjected to hydrophilic modification into the solution A, sealing the solution A, reacting the solution A at normal temperature for 15-90min, and drying the reaction product to obtain the MOFs modified PPS melt-blown fabric;
4) and (3) carrying out hot pressing on the PPS melt-blown fabric modified by the MOFs, and then rapidly cooling to obtain the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm.
2. The preparation method of the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm according to claim 1, characterized in that in the step 1), the drying process is to continuously dry the PPS resin in an environment of 60-120 ℃ until the PPS resin is completely dried.
3. The preparation method of the PPS/MOFs micro-nanofiber alkaline water electrolyzer diaphragm as claimed in claim 1, wherein in the step 1), the melt-blown process parameters are as follows: the temperatures of all heating sections of the melt-blowing equipment are 275 ℃, 330 ℃ and 330 ℃ respectivelyThe temperature of the pipeline is 320 ℃, the temperature of the metering pump is 330 ℃, the temperature of the spinning nozzle is 290-320 ℃, and the air volume of the hot air is 0.70-0.9m3The supply amount of a metering pump is 98-120g/min, and the receiving distance is 23-32 cm.
4. The preparation method of the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm according to claim 1, characterized in that in the step 1), the PPS resin is melt-blown PPS resin; the gram weight of the PPS melt-blown fabric is 30-120g/m2The diameter of the melt-blown fabric is 3-5 μm.
5. The preparation method of the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm according to claim 1, characterized in that in the step 2), the hydrophilic modification adopts weak amination treatment, plasma treatment, ozone modification, fuming sulfuric acid modification or chlorosulfonic acid modification.
6. The preparation method of the PPS/MOFs micro-nanofiber alkaline water electrolyzer diaphragm as claimed in claim 5, characterized in that the weak amination treatment is: soaking PPS melt-blown fabric in a nitric acid solution with the temperature of 50 ℃ and the mass fraction of 33% -34% for 20-100min, taking out the PPS melt-blown fabric, washing the PPS melt-blown fabric with deionized water until the washing liquid is neutral, and completely drying the PPS melt-blown fabric in a vacuum environment at the temperature of 50-70 ℃.
7. The method for preparing the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm according to claim 1, wherein in the step 3), the MOFs is ZIF-90.
8. The method for preparing the PPS/MOFs micro-nano fiber alkaline water electrolyzer membrane according to claim 1, characterized in that in the step 3), the drying process is continuously drying to complete drying in a vacuum environment at 50-70 ℃.
9. The preparation method of the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm according to claim 1, characterized in that in the step 4), the hot pressing process parameters are 50-120 ℃, 1.0-5.0MPa and 10-60s of hot pressing time.
10. The method for preparing the PPS/MOFs micro-nano fiber alkaline water electrolyzer diaphragm according to claim 1, characterized in that in the step 4), the cooling process is hot pressing, and then the diaphragm is rapidly placed in normal temperature deionized water for cooling.
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