Alkaline water hydrogen production diaphragm as well as preparation method and application thereof

Abstract

The invention discloses an alkaline water hydrogen production diaphragm as well as a preparation method and application thereof, and belongs to the technical field of hydrogen production diaphragms. The preparation method comprises the following steps: firstly, adding polyphenylene sulfide short fibers into pulp of polyphenylene sulfide superfine fibers, uniformly mixing, and dispersing in an aqueous solution of polyoxyethylene to prevent the fibers from settling, so as to prepare uniformly dispersed polyphenylene sulfide short fiber / polyphenylene sulfide superfine fiber mixed pulp; and coating two sides of base cloth with the mixed slurry as a coating, drying, and carrying out hot pressing treatment on the base cloth with the coating to prepare the alkaline water hydrogen production diaphragm. The polyphenylene sulfide short fibers are uniformly mixed in the pulp of the polyphenylene sulfide superfine fibers, the strength of the diaphragm is improved due to the addition of the polyphenylene sulfide short fibers, and the bonding effect between the coating and the base cloth is also improved due to the fact that the polyphenylene sulfide superfine fibers serve as a bonding agent, so that the finally prepared diaphragm is high in strength and long in service life. And under the condition of the same diaphragm thickness, the gram weight of the diaphragm prepared by the invention is obviously reduced compared with that of the existing composite diaphragm.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen production membranes, and more specifically, relates to an alkaline water hydrogen production membrane and a preparation method and application thereof. Background Art

[0002] At present, the main method for industrial large-scale production of hydrogen is water electrolysis. This process is relatively mature, not only has high yield, but also is more environmentally friendly. Among them, water electrolysis is mainly divided into alkaline water electrolysis (AWE), proton exchange membrane water electrolysis (PEM), solid oxide water electrolysis (SOEC) and anion exchange membrane water electrolysis (AEM). Alkaline water electrolysis technology is the most mature and commercialized water electrolysis technology.

[0003] The diaphragm is the main core material of alkaline water electrolysis hydrogen production equipment. Its first function is to prevent the oxygen produced on the anode side and the hydrogen produced on the cathode side from mixing to ensure the purity of the hydrogen; the second function is to ensure the rapid movement of ions, reduce energy consumption, and improve hydrogen production efficiency. Therefore, the diaphragm for water electrolysis hydrogen production must have high density and good hydrophilic properties. Polyphenylene sulfide composite diaphragm plays an important role in alkaline water electrolysis hydrogen production equipment, and has the following two functions:

[0004] (1) It can effectively replace asbestos diaphragms: Although asbestos diaphragms were first used to produce hydrogen by electrolysis of water, the asbestos diaphragm's overall tensile strength in alkaline water electrolyte is reduced due to the swelling and chemical instability of asbestos itself, making the diaphragm susceptible to the impact of electrolyte and gas, thereby contaminating the electrolyte. The polyphenylene sulfide composite diaphragm has the characteristics of corrosion resistance and chemical stability, which can ensure the long-term stable operation of the electrolytic cell and reduce replacement and maintenance costs;

[0005] (2) Optimization of polyphenylene sulfide diaphragm: Polyphenylene sulfide diaphragm is widely used due to its high temperature resistance, stability to concentrated alkali, and medium resistance. However, its hydrophilicity is weak, which will lead to a large internal resistance of the electrolytic cell and high energy consumption. Generally, a composite diaphragm is prepared by coating a ceramic coating such as zirconium oxide on the polyphenylene sulfide diaphragm, which not only improves the hydrophilicity and ionic conductivity of the diaphragm, but also enhances the physical and chemical stability of the diaphragm.

[0006] However, in the process of applying composite membranes as alkaline water hydrogen production membranes, there are also the following technical pain points: due to the poor interface compatibility between polyphenylene sulfide and the coating material, the bonding force between the coating and the base membrane is weak, and it is easy to fall off during use, which directly affects the integrity and performance of the diaphragm, thereby shortening its service life. Summary of the invention

[0007] In view of the defects of the prior art and the need for improvement, the present invention provides an alkaline water hydrogen production diaphragm and a preparation method and application thereof, aiming to solve the technical problems of the existing composite diaphragm coating being easy to fall off and having a short service life.

[0008] To achieve the above object, in a first aspect, the present invention provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0009] A1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry;

[0010] A2, the mixed slurry obtained in step A1 is evenly coated on both sides of the base fabric by gravure roller coating, and after drying, a base fabric with a coating is obtained, wherein the base fabric is a polymer mesh fabric or a polymer woven fabric; wherein the gravure roller coating process conditions are: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min;

[0011] A3, hot pressing the coated base fabric obtained in step A2 to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 80-250° C. and the hot pressing pressure is 1-10 MPa;

[0012] A4. Performing hydrophilic treatment on the alkaline water hydrogen production membrane obtained in step A3 to obtain a hydrophilic alkaline water hydrogen production membrane.

[0013] In a second aspect, the present invention provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0014] B1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry;

[0015] B2, adding a treatment agent to the mixed slurry obtained in step B1 to obtain a mixed slurry of hydrophilic polyphenylene sulfide staple fibers / polyphenylene sulfide ultrafine fibers;

[0016] B3, the mixed slurry of the hydrophilic polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber obtained in step B2 is uniformly coated on both sides of the base fabric by gravure roller coating, and the base fabric with coating is obtained after drying, wherein the base fabric is a polymer mesh fabric or a polymer woven fabric; wherein the gravure roller coating process conditions are: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min;

[0017] B4. Hot-pressing the coated base fabric obtained in step B3 to obtain an alkaline water hydrogen production membrane; wherein the hot-pressing temperature is 80-250° C. and the hot-pressing pressure is 1-10 MPa.

[0018] In a third aspect, the present invention provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0019] C1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry;

[0020] C2, the mixed slurry obtained in step C1 is uniformly coated on one side of two base fabrics by gravure roller coating, and two base fabrics with coatings are obtained after drying, wherein the base fabrics are polymer mesh fabrics or polymer woven fabrics; wherein the gravure roller coating process conditions are as follows: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min;

[0021] C3, laminating the two sides of the base fabrics obtained in step C2, both of which have the coating, and then performing hot pressing treatment to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 80 to 250° C., and the hot pressing pressure is 1 to 10 MPa;

[0022] C4. Performing hydrophilic treatment on the alkaline water hydrogen production membrane obtained in step C3 to obtain a hydrophilic alkaline water hydrogen production membrane.

[0023] In a fourth aspect, the present invention provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0024] D1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry;

[0025] D2, adding a treatment agent to the mixed slurry obtained in step D1 to obtain a mixed slurry of hydrophilic polyphenylene sulfide staple fibers / polyphenylene sulfide ultrafine fibers;

[0026] D3, the mixed slurry of the hydrophilic polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber obtained in step D2 is uniformly coated on one side of two base fabrics by gravure roller coating, and two base fabrics with coatings are obtained after drying, wherein the base fabric is a polymer mesh fabric or a polymer woven fabric; wherein the gravure roller coating process conditions are: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min;

[0027] D4. Laminating the coated sides of the two base fabrics obtained in step D3 and subjecting them to hot pressing treatment to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 80-250° C. and the hot pressing pressure is 1-10 MPa.

[0028] In a fifth aspect, the present invention provides an alkaline water hydrogen production membrane, wherein the alkaline water hydrogen production membrane is prepared by the preparation method described in the first to fourth aspects.

[0029] Furthermore, the diameter of the polyphenylene sulfide staple fiber is 2 to 30 μm, and the length is 10 to 100 mm; the diameter of the polyphenylene sulfide superfine fiber is 0.5 to 10 μm.

[0030] Furthermore, the mass percentage of the polyphenylene sulfide ultrafine fibers and the polyphenylene sulfide staple fibers is 1:0.5-10.

[0031] Furthermore, the base fabric has a thickness of 50 to 300 μm, wherein the polymer constituting the base fabric includes one or more of polyphenylene sulfide and polyetheretherketone.

[0032] Furthermore, the base fabric is a polymer mesh fabric, the surface opening rate of the polymer mesh fabric is ≥25%, the mesh is an equilateral right triangle, and the right angle side length is 100 to 5000 μm; the polymer mesh fabric is woven from polymer single filaments, or polymer filament twisted double filaments, or polymer twisted yarns.

[0033] In a sixth aspect, the present invention provides an electrolytic cell, comprising: a cathode, an anode and the alkaline water hydrogen production membrane as described in the fifth aspect.

[0034] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

[0035] The present invention first adds polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, mixes them evenly, and then disperses the mixed solution in an aqueous solution of polyethylene oxide to prevent fiber sedimentation, thereby obtaining a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry. The mixed slurry is then coated on both sides of a base fabric as a coating, and the base fabric with the coating is subjected to a hot pressing treatment to obtain an alkaline water hydrogen production diaphragm with polyphenylene sulfide staple fibers / polyphenylene sulfide superfine composite fibers on both sides; or, the mixed slurry is coated on one side of two base fabrics as a coating, and the two sides of the base fabrics with the coatings are bonded and then subjected to a hot pressing treatment to obtain an alkaline water hydrogen production diaphragm with polyphenylene sulfide staple fibers / polyphenylene sulfide superfine composite fibers in the middle. By uniformly mixing the polyphenylene sulfide staple fibers with the pulp of polyphenylene sulfide ultrafine fibers, the addition of the polyphenylene sulfide staple fibers improves the strength of the diaphragm, and the polyphenylene sulfide ultrafine fibers as a binder also improve the bonding effect between the coating and the base fabric, so that the finally prepared diaphragm has high strength and long service life. Moreover, under the condition of the same diaphragm thickness, the gram weight of the diaphragm prepared by the present invention is significantly lower than that of the existing composite diaphragm. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] The experimental methods in the following examples, unless otherwise specified, are all conventional methods, and are performed according to the techniques or conditions described in the literature in the field or according to the product instructions. The materials, reagents, etc. used in the following examples, unless otherwise specified, can all be obtained from commercial channels.

[0038] Example 1

[0039] This embodiment provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0040] (1) Weigh 1.0 g of polyphenylene sulfide ultrafine fibers with a diameter of 5 μm and 0.5 g of polyphenylene sulfide staple fibers with a diameter of 10 μm and a length of 50 mm, and beat the polyphenylene sulfide ultrafine fibers. Then, add the polyphenylene sulfide staple fibers to the pulp of the polyphenylene sulfide ultrafine fibers, and use a fiber disintegrator to disperse and mix them for 1 hour. After mixing evenly, disperse the mixture in an aqueous solution with a mass fraction of 0.1% polyethylene oxide to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber mixed slurry.

[0041] (2) The mixed slurry obtained in step (1) is uniformly coated on both sides of the polyphenylene sulfide mesh cloth by gravure roller coating, and a polyphenylene sulfide mesh cloth with a coating is obtained after drying, wherein the thickness of the mixed slurry coated on each side is 20 μm, the thickness of the polyphenylene sulfide mesh cloth is 50 μm, the polyphenylene sulfide mesh cloth is woven from polyphenylene sulfide single filaments, the surface opening rate is 25%, the mesh is square and the side length is 100 μm; the gravure roller coating process conditions are: temperature 120° C., time 1 h, and roller coating speed 20 m / min.

[0042] (3) The coated polyphenylene sulfide mesh cloth obtained in step (2) is subjected to hot pressing treatment to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 180° C. and the hot pressing pressure is 5 MPa.

[0043] (4) The alkaline water hydrogen production membrane obtained in step (3) is subjected to a sulfidation hydrophilic treatment to obtain a hydrophilic alkaline water hydrogen production membrane.

[0044] The hydrophilic alkaline water hydrogen production membrane prepared in this embodiment has a porosity of 67.2%, an average pore size of 0.8 μm, a water contact angle of 2.3°, a breaking strength of 21.3 MPa, and an elongation at break of 16.2%.

[0045] Example 2

[0046] This embodiment provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0047] (1) Weigh 1.0 g of polyphenylene sulfide ultrafine fibers with a diameter of 0.5 μm and 5.0 g of polyphenylene sulfide staple fibers with a diameter of 2 μm and a length of 10 mm, and beat the polyphenylene sulfide ultrafine fibers. Then, add the polyphenylene sulfide staple fibers to the pulp of the polyphenylene sulfide ultrafine fibers, and use a fiber disintegrator to disperse and mix them for 1.5 h. After mixing evenly, disperse the mixture in an aqueous solution of polyethylene oxide with a mass fraction of 0.13% to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber mixed slurry.

[0048] (2) Adding a treating agent, nano-zirconium oxide, to the mixed slurry obtained in step (1) to obtain a mixed slurry of hydrophilic polyphenylene sulfide staple fibers / polyphenylene sulfide ultrafine fibers.

[0049] (3) The mixed slurry of the hydrophilic polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber obtained in step (2) is uniformly coated on both sides of the polyetheretherketone mesh cloth by gravure roller coating, and after drying, a coated polyetheretherketone mesh cloth is obtained, wherein the thickness of the mixed slurry coated on each side is 100 μm, the thickness of the polyetheretherketone mesh cloth is 150 μm, the polyetheretherketone mesh cloth is woven from polyetheretherketone filaments and twisted double filaments, the surface opening rate is 40%, the mesh is square and the side length is 1500 μm; the gravure roller coating process conditions are: temperature 130°C, time 1.5 h, roller coating speed 60 m / min.

[0050] (4) The coated polyetheretherketone mesh cloth obtained in step (3) is subjected to hot pressing treatment to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 80° C. and the hot pressing pressure is 1 MPa.

[0051] The hydrophilic alkaline water hydrogen production membrane prepared in this embodiment has a porosity of 60.8%, an average pore size of 4.2 μm, a water contact angle of 4.5°, a breaking strength of 17.8 MPa, and an elongation at break of 17.5%.

[0052] Embodiment 3:

[0053] This embodiment provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0054] (1) Weigh 1.0 g of polyphenylene sulfide ultrafine fibers with a diameter of 10 μm and 10.0 g of polyphenylene sulfide staple fibers with a diameter of 30 μm and a length of 100 mm, and beat the polyphenylene sulfide ultrafine fibers. Then, add the polyphenylene sulfide staple fibers to the pulp of the polyphenylene sulfide ultrafine fibers, and use a fiber disintegrator to disperse and mix them for 2 h. After mixing evenly, disperse the mixture in an aqueous solution with a mass fraction of 0.2% polyethylene oxide to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber mixed slurry.

[0055] (2) The mixed slurry obtained in step (1) is uniformly coated on one side of two polyphenylene sulfide woven fabrics by gravure roller coating, and two coated polyphenylene sulfide woven fabrics are obtained after drying, wherein the thickness of the mixed slurry coated on each polyphenylene sulfide woven fabric is 100 μm, and the thickness of the polyphenylene sulfide woven fabric is 300 μm; the polyphenylene sulfide woven fabric is woven by a traditional weaving process, and the polyphenylene sulfide fibers are woven according to a specific warp and weft interlacing method; the gravure roller coating process conditions are: temperature 150° C., time 2 h, and roller coating speed 100 m / min.

[0056] (3) The two base fabrics obtained in step (2) are bonded together on one side with the coating and then hot-pressed to obtain an alkaline water hydrogen production membrane; wherein the hot-pressing temperature is 250° C. and the hot-pressing pressure is 10 MPa.

[0057] (4) The alkaline water hydrogen production membrane obtained in step (3) is subjected to a sulfidation hydrophilic treatment to obtain a hydrophilic alkaline water hydrogen production membrane.

[0058] The hydrophilic alkaline water hydrogen production membrane prepared in this embodiment has a porosity of 54.2%, an average pore size of 2.5 μm, a water contact angle of 7.6°, a breaking strength of 26.4 MPa, and an elongation at break of 14.2%.

[0059] Embodiment 4:

[0060] This embodiment provides a method for preparing an alkaline water hydrogen production membrane, comprising the following steps:

[0061] (1) Weigh 1.0 g of polyphenylene sulfide ultrafine fibers with a diameter of 10 μm and 10.0 g of polyphenylene sulfide staple fibers with a diameter of 30 μm and a length of 100 mm, and beat the polyphenylene sulfide ultrafine fibers. Then, add the polyphenylene sulfide staple fibers to the pulp of the polyphenylene sulfide ultrafine fibers, and use a fiber disintegrator to disperse and mix them for 2 h. After mixing evenly, disperse the mixture in an aqueous solution with a mass fraction of 0.2% polyethylene oxide to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber mixed slurry.

[0062] (2) Adding nitric acid as a treating agent to the mixed slurry obtained in step (1) to obtain a mixed slurry of hydrophilic polyphenylene sulfide staple fibers / polyphenylene sulfide ultrafine fibers.

[0063] (3) The mixed slurry of the hydrophilic polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber obtained in step (2) is uniformly coated on one side of two polyphenylene sulfide woven fabrics by gravure roller coating, and two coated polyphenylene sulfide woven fabrics are obtained after drying, wherein the thickness of the mixed slurry coated on each polyphenylene sulfide woven fabric is 100 μm, and the thickness of the polyphenylene sulfide woven fabric is 300 μm; the polyphenylene sulfide woven fabric is woven by a traditional weaving process, and the polyphenylene sulfide fibers are woven according to a specific warp and weft interlacing method; the gravure roller coating process conditions are: temperature 150°C, time 2h, and roller coating speed 100m / min.

[0064] (4) Laminating the coated sides of the two base fabrics obtained in step (3) and performing hot pressing to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 250° C. and the hot pressing pressure is 10 MPa.

[0065] The hydrophilic alkaline water hydrogen production membrane prepared in this embodiment has a porosity of 57.2%, an average pore size of 2.9 μm, a water contact angle of 8.7°, a breaking strength of 21.5 MPa, and an elongation at break of 17.4%.

[0066] Example 5

[0067] This embodiment provides an alkaline water hydrogen production membrane, which includes, from left to right, a first polyphenylene sulfide composite fiber layer, a base fabric layer, and a second polyphenylene sulfide composite fiber layer; the polyphenylene sulfide composite fiber is composed of polyphenylene sulfide ultrafine fibers and polyphenylene sulfide staple fibers, and the thickness of the polyphenylene sulfide composite fiber layer is 20 to 200 μm; the diameter of the polyphenylene sulfide staple fibers is 2 to 30 μm, and the length is 10 to 100 mm; the diameter of the polyphenylene sulfide ultrafine fibers is 0.5 to 10 μm; the first base fabric and the second base fabric are polymer mesh fabrics or polymer woven fabrics, and the thickness is 50 to 300 μm. The thickness of the alkaline water hydrogen production membrane is 90 to 700 μm.

[0068] Example 6

[0069] This embodiment provides an alkaline water hydrogen production membrane, which includes, from left to right, a first base fabric layer, a polyphenylene sulfide composite fiber layer, and a second base fabric layer; the polyphenylene sulfide composite fiber is composed of polyphenylene sulfide ultrafine fibers and polyphenylene sulfide staple fibers, and the thickness of the polyphenylene sulfide composite fiber layer is 20 to 200 μm; the diameter of the polyphenylene sulfide staple fibers is 2 to 30 μm, and the length is 10 to 100 mm; the diameter of the polyphenylene sulfide ultrafine fibers is 0.5 to 10 μm; the first base fabric and the second base fabric are polymer mesh fabrics or polymer woven fabrics, and the thickness is 50 to 300 μm. The thickness of the alkaline water hydrogen production membrane is 120 to 700 μm.

[0070] Example 7

[0071] This embodiment provides an electrolyzer, comprising: a cathode, an anode, and an alkaline water hydrogen production membrane as described in Example 5 or Example 6.

[0072] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing an alkaline water hydrogen production membrane, characterized in that: The steps include: A1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry; A2, the mixed slurry obtained in step A1 is evenly coated on both sides of the base fabric by gravure roller coating, and after drying, a base fabric with a coating is obtained, wherein the base fabric is a polymer mesh fabric or a polymer woven fabric; wherein the gravure roller coating process conditions are: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min; A3, hot pressing the coated base fabric obtained in step A2 to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 80-250° C. and the hot pressing pressure is 1-10 MPa; A4. Performing hydrophilic treatment on the alkaline water hydrogen production membrane obtained in step A3 to obtain a hydrophilic alkaline water hydrogen production membrane.

2. A method for preparing an alkaline water hydrogen production membrane, characterized in that: The steps include: B1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry; B2, adding a treatment agent to the mixed slurry obtained in step B1 to obtain a mixed slurry of hydrophilic polyphenylene sulfide staple fibers / polyphenylene sulfide ultrafine fibers; B3, the mixed slurry of the hydrophilic polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber obtained in step B2 is uniformly coated on both sides of the base fabric by gravure roller coating, and the base fabric with coating is obtained after drying, wherein the base fabric is a polymer mesh fabric or a polymer woven fabric; wherein the gravure roller coating process conditions are: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min; B4. Hot-pressing the coated base fabric obtained in step B3 to obtain an alkaline water hydrogen production membrane; wherein the hot-pressing temperature is 80-250° C. and the hot-pressing pressure is 1-10 MPa.

3. A method for preparing an alkaline water hydrogen production membrane, characterized in that: The steps include: C1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry; C2, the mixed slurry obtained in step C1 is uniformly coated on one side of two base fabrics by gravure roller coating, and two base fabrics with coatings are obtained after drying, wherein the base fabrics are polymer mesh fabrics or polymer woven fabrics; wherein the gravure roller coating process conditions are as follows: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min; C3, laminating the two sides of the base fabrics obtained in step C2, both of which have the coating, and then performing hot pressing treatment to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 80 to 250° C., and the hot pressing pressure is 1 to 10 MPa; C4. Performing hydrophilic treatment on the alkaline water hydrogen production membrane obtained in step C3 to obtain a hydrophilic alkaline water hydrogen production membrane.

4. A method for preparing an alkaline water hydrogen production membrane, characterized in that: The steps include: D1. Adding polyphenylene sulfide staple fibers to the pulp of polyphenylene sulfide superfine fibers, dispersing and mixing for 1 to 2 hours; after uniform mixing, dispersing the mixed solution in an aqueous solution of polyethylene oxide with a mass fraction of 0.1 to 0.2%, to obtain a uniformly dispersed polyphenylene sulfide staple fiber / polyphenylene sulfide superfine fiber mixed slurry; D2, adding a treatment agent to the mixed slurry obtained in step D1 to obtain a mixed slurry of hydrophilic polyphenylene sulfide staple fibers / polyphenylene sulfide ultrafine fibers; D3, the mixed slurry of the hydrophilic polyphenylene sulfide staple fiber / polyphenylene sulfide ultrafine fiber obtained in step D2 is uniformly coated on one side of two base fabrics by gravure roller coating, and two base fabrics with coatings are obtained after drying, wherein the base fabric is a polymer mesh fabric or a polymer woven fabric; wherein the gravure roller coating process conditions are: temperature 120-150° C., time 1-2 h, and roller coating speed 20-100 m / min; D4. Laminating the coated sides of the two base fabrics obtained in step D3 and performing hot pressing to obtain an alkaline water hydrogen production membrane; wherein the hot pressing temperature is 80-250° C. and the hot pressing pressure is 1-10 MPa.

5. An alkaline water hydrogen production membrane, characterized in that: The alkaline water hydrogen production membrane is prepared by the preparation method according to any one of claims 1 to 4.

6. The alkaline water hydrogen production membrane according to claim 5, characterized in that: The diameter of the polyphenylene sulfide staple fiber is 2 to 30 μm, and the length is 10 to 100 mm; the diameter of the polyphenylene sulfide superfine fiber is 0.5 to 10 μm.

7. The alkaline water hydrogen production membrane according to claim 6, characterized in that: The mass percentage of the polyphenylene sulfide ultrafine fibers and the polyphenylene sulfide staple fibers is 1:0.5-10.

8. The alkaline water hydrogen production membrane according to claim 5, characterized in that: The thickness of the base fabric is 50-300 μm, wherein the polymer constituting the base fabric includes one or more of polyphenylene sulfide and polyetheretherketone.

9. The alkaline water hydrogen production membrane according to claim 8, characterized in that: The base fabric is a polymer mesh fabric, the surface opening rate of the polymer mesh fabric is ≥25%, the mesh is an equilateral right triangle, and the right angle side length is 100-5000 μm; the polymer mesh fabric is woven from polymer single filaments, polymer filament double filaments, or polymer twisted yarns.

10. An electrolytic cell, characterized in that: The electrolyzer comprises: a cathode, an anode and the alkaline water hydrogen production membrane according to any one of claims 5 to 9.