88results about How to "Avoid uneven load" patented technology

The invention discloses an electrocatalyst material for in-situ production of hydrogen peroxide through oxygen reduction as well as a preparation method and application of the electrocatalyst material, and belongs to the field of organic wastewater treatment. MoS2 / Fe porous conductive particles and a high-molecular polymer are adopted as main components, and ethanedioate and polyacrylamide are combined as a dispersion auxiliary solvent and a pore-forming agent to form a three-dimensional composite conductive catalyst material; through ultralow-temperature freeze drying and microwave radiation technologies, the material structure is optimized, the catalytic reaction active sites are improved, and efficient electrocatalytic oxygen reduction for in-situ production of hydrogen peroxide is realized; the MoS2 / Fe porous conductive particles not only optimize the performance of the catalyst, but also realize high-valued utilization of solid wastes; the electrocatalyst material has excellent conductivity, catalytic activity and organic wastewater degradation capability, is stable in removal effect before and after use, can be repeatedly used for multiple times, reduces the use cost, and provides a wide application prospect for the fields of environmental protection, energy and the like.

The invention discloses a nanoparticle / polyvinylidene fluoride composite piezoelectric gain photocatalytic antibacterial film and a preparation method and application thereof.The preparation method comprises the steps that a polyvinylidene fluoride solution serves as a core layer spinning solution, and photocatalytic nano sol serves as a skin layer spinning solution; and carrying out coaxial electrostatic spinning on the polyvinylidene fluoride solution and the photocatalytic nano sol to prepare the nano particle / polyvinylidene fluoride composite piezoelectric gain photocatalytic antibacterial film. According to the preparation method disclosed by the invention, nano-scale photocatalytic sol is fixed on the surface of micron-scale polyvinylidene fluoride in one step by utilizing an electrostatic spinning technology, so that the polyvinylidene fluoride is prevented from coating effective components, and the effective components are also prevented from blocking holes of polyvinylidene fluoride fibers; effective separation and directional migration of electrons and holes of sol on the surface are effectively promoted, and the capacity of photocatalytic nano sol for removing biological aerosol is improved. The preparation method is simple in industry, low in energy consumption and easy for large-scale production.

The invention discloses an electrochemical system and method for treating nitrogen-containing organic wastewater based on a double-sided cathode. The electrochemical system comprises a reactor, an aeration device, a power supply, an anode and the double-sided cathode, and the double-sided cathode is prepared by loading a functional catalyst through a double-sided rolling coating process. Under the condition of not adding exogenous iron ions and H2O2, the side, with the electro-catalytic degradation function, in the double-sided cathode generates. OH in situ through the oxygen reduction reaction of two electrons and the electro-Fenton process, so that efficient degradation of organic pollutants is realized; meanwhile, NO3 <-> can be converted into N2 to be discharged under the synergistic effect of the sides, with the denitrification function, of the DSA and the double-sided cathode, organic pollutants and total nitrogen are synchronously removed, the denitrification function and the electrocatalytic degradation function are integrated in the single cathode, the device is more compact and efficient, the current efficiency and the mass transfer efficiency are improved, and the device is suitable for large-scale popularization and application. The complexity and the occupied area of the system are reduced, and the energy consumption and the operation cost are reduced.

The invention discloses iridium-cobalt oxide nanoparticles as well as a preparation method and application thereof. The iridium-cobalt oxide nanoparticles comprise a cobaltosic oxide carrier and supported iridium oxide. The preparation method comprises the following steps: 1) preparing an iridium salt-cobalt salt aqueous solution; 2) preparing a reaction solution of a complex containing iridium ammonium salt and cobalt; (3) preparing an iridium hydroxide-cobalt complex compound; and 4) grinding the iridium hydroxide-cobalt complex compound, placing the ground complex compound in an oxygen-containing atmosphere for heat treatment, and then carrying out water washing and drying. The iridium-cobalt oxide nano-particles are low in iridium content, small and uniform in particle size and simple in preparation method, have the advantages of being high in electrochemical activity, good in electrochemical stability and the like when being used as an OER reaction catalyst, and are suitable for large-scale industrial application in the field of hydrogen production through water electrolysis.

The invention relates to the field of materials, and discloses a three-dimensional graphene / metal oxide composite pellet and a preparation method and application field thereof, the three-dimensional graphene / metal oxide composite pellet comprises a graphene pellet and a metal oxide loaded on the graphene pellet; wherein the specific surface area of the three-dimensional graphene / metal oxide composite sphere is 50-500m < 2 > / g. In the obtained three-dimensional graphene / metal oxide composite sphere, the metal oxide is uniformly loaded on the surface of the graphene sphere, and the sphere internally has a rich pore structure, so that the application of gas sensing, catalysis, energy storage and the like is facilitated.

The invention relates to the technical field of lithium batteries, and discloses a ZIF-derived high-nano-silicon-loaded silicon-carbon negative electrode material, a preparation method and a battery, and the preparation method comprises the following steps: S1, surface modification of nano silicon; s2, preparing a ZIF precursor solution; s3, mixing the surface modified nano silicon with the ZIF precursor solution, and compounding by adopting mechanical ball milling; and S4, carrying out carbonization treatment on the composite material to prepare the ZIF-derived high-nano-silicon-loaded silicon-carbon negative electrode material. According to the preparation method disclosed by the invention, high-uniformity distribution of nano silicon in a carbon-based skeleton is realized based on a mechanical ball-milling method by modifying the surface of the nano silicon, optimizing the structural design of a ZIF material and introducing a silicon precursor, and a carbon network with excellent conductivity is formed by controlling a carbonization process, so that the electrochemical performance and the cycling stability of the composite material are remarkably improved.

The invention relates to a preparation method of cell-loaded silk fibroin hydrogel fibers and fibers, the preparation method of the cell-loaded silk fibroin hydrogel fibers comprises the following steps: mixing a silk fibroin solution with a riboflavin solution to obtain a mixed solution, adding a hydrogen peroxide solution into the mixed solution to obtain a precursor solution, and carrying out ultrasonic treatment on the precursor solution to obtain the cell-loaded silk fibroin hydrogel fibers. Adding stem cells into the precursor solution, and then carrying out photocuring reaction under the irradiation of an ultraviolet lamp to prepare the hydrogel fiber. The fiber is obtained through the preparation method. According to the preparation method of the cell-loaded silk fibroin hydrogel fiber and the fiber, the gel forming time is greatly shortened, efficient and uniform loading of cells is achieved, the survival rate of the cells is increased, no organic reagent residues exist in the preparation process, operation is easy, the technological process is short, and the method is suitable for industrial production. The prepared fiber is free of biotoxicity, excellent in mechanical property, good in light transmission and good in biocompatibility, and has certain potential and application prospects in the biomedical field.

The utility model relates to the technical field of catalyst preparation equipment, in particular to a reaction kettle for efficiently preparing a platinum-carbon catalyst. The utility model provides a reaction kettle for efficiently preparing a platinum-carbon catalyst. The reaction kettle comprises a cart, a reaction kettle body, a controller, a pump machine, a liquid conveying pipe, a gas conveying pipe, a connecting pipe and the like, a reaction kettle body is fixedly connected to the top of a top plate of the cart, a first cavity and a second cavity are formed in the reaction kettle body, a controller is fixedly connected to the bottom of the top plate of the cart, a pump is fixedly connected to the upper portion of the front side of the reaction kettle body, one end of a liquid conveying pipe is communicated with the inner bottom of the first cavity, the other end of the liquid conveying pipe penetrates through the pump and is communicated with a connecting pipe, and a gas conveying pipe is communicated with the connecting pipe. According to the utility model, by arranging the ultrasonic vibration rod and the stirring mechanism, ultrasonic dispersion and mechanical stirring of raw materials are realized, uniformly dispersed turbid liquid is obtained, the reduction reaction can be fully carried out, platinum particles can be more uniformly loaded on a carbon carrier, and thus the performance of the prepared platinum-carbon catalyst is improved.

The present application belongs to the technical field of high-performance nylon fiber materials, and particularly relates to a preparation method of antibacterial modified high-performance nylon fiber. The preparation method comprises the following steps: S1, a triazine ring-containing dicarboxylic acid is prepared by taking cyanuric chloride, 4-amino-2,2,6,6-tetramethylpiperidine and p-hydroxybenzoic acid as raw materials, triphenylphosphine oxide is subjected to nitration treatment and reduction treatment to obtain tris(3-aminophenyl)phosphine oxide, and the triazine ring-containing dicarboxylic acid and the tris(3-aminophenyl)phosphine oxide are mixed for a synthesis reaction to obtain modified hyperbranched polyamide; S2, polyamide masterbatch, modified hyperbranched polyamide, antibacterial material, zinc stearate and antioxidant are melt blended, extruded and granulated to obtain modified nylon chip; and S3, the modified nylon chip is subjected to melt spinning to obtain antibacterial modified high-performance nylon fiber. The present application not only ensures that the fiber has good antibacterial performance, but also effectively improves the breaking strength and flame retardant performance.

The utility model discloses a rotary fruit picking mechanism which aims to solve the problem that an existing harvester is low in harvesting efficiency when fruits on the ground of a large land parcel are collected. The rotary fruit picking mechanism is installed on a fruit picking machine, the rotary fruit picking mechanism comprises a cover body, a roller rotationally installed in the cover body and a driving mechanism driving the roller to rotate, and a fruit storage area for containing fruits is formed between the lower end of the cover body and the ground. A plurality of groups of picking parts extending axially are arranged on the roller in the circumferential direction, the rotation of the plurality of groups of picking parts drives fruits in the fruit storage area to move into the cover body to complete fruit picking, part of the picking parts are long picking groups, part of the picking parts are short picking groups, and the radial length of the long picking groups is larger than that of the short picking groups. The utility model further provides a fruit picking machine which adopts the rotary fruit picking mechanism of the technical scheme.

The invention provides a fiber multilayer composite air filtering material and a preparation method thereof. The fiber multilayer composite air filtering material comprises a fiber base material, a metal catalyst is loaded on the fiber base material, the surface of the fiber base material is covered with a nanofiber membrane, the fiber base material is composed of alkali-treated bamboo fibers and polymer fibers, and the nanofiber membrane contains an antibacterial agent and a silane coupling agent. The fiber multilayer composite air filtering material has the advantages of high catalyst loading capacity, excellent filtering efficiency, good mechanical strength and toughness and the like, the raw materials are wide in source, the process is simple and environment-friendly, and a new way is provided for development of multifunctional air filtering materials. The invention also provides a preparation method of the fiber multilayer composite air filtering material.

A catalyst for coupling pyridine to prepare 2,2-bipyridine and a preparation method thereof, relates to the technical field of catalyst preparation. The catalyst takes nickel oxide as an active component, enhances the basicity of the catalyst surface by introducing an auxiliary element, loads the active component on alumina by a deposition precipitation method, and is prepared by kneading and extruding into a strip. The method is simple in preparation and low in cost. The obtained catalyst can make the conversion rate of pyridine reach 14.98% and above under low temperature reaction conditions of 110 DEG C, the selectivity of 2,2-bipyridine is as high as 80% and above, and the catalyst has good catalytic activity and application prospect.

This invention discloses an antifouling membrane made of lanthanum-loaded carbon nanomaterials suitable for phosphorus recovery in wastewater, its preparation method, and its applications. The invention involves loading lanthanum carbonate octahydrate onto the surface of multi-walled carbon nanotubes (MWCNTs) to form lanthanum-loaded carbon nanomaterials (La@MWCNTs), which are then deposited onto the surface of a polyethersulfone-based membrane using vacuum filtration to form a self-supporting membrane. The prepared lanthanum-loaded carbon nanomaterial antifouling membrane possesses both phosphorus removal and recovery capabilities, exhibiting high efficiency in phosphorus removal from water. This facilitates phosphorus elution and recovery, effectively solving the problems of lanthanum-loaded carbon nanomaterial aggregation and recovery, and effectively avoiding the risk of lanthanum-based adsorbent leakage during phosphorus removal. Furthermore, the lanthanum-loaded carbon nanomaterial antifouling membrane operates within a low-pressure range, exhibiting low energy consumption and effectively mitigating membrane fouling caused by humic acid. It shows promising application prospects in wastewater phosphorus recovery and eutrophication control.

The application provides a preparation method of a double-metal MOF material functionalized transistor sensor for BPA detection, and the material uses ZIF-8 as a carbon source, and a carbon material (Ce@ZIF8 / C) with rich mesoporous structures and good dispersed metal active sites embedded with Ce and Zn double metals is successfully prepared by using a direct pyrolysis method. The Ce@ZIF8 / C material prepared by the application can be applied to the functionalization of a gate electrode of an SGGT sensor, and an electrochemical sensor for real-time monitoring of an organic pollutant BPA in water can be successfully constructed. The electrochemical sensor constructed by the material synthesized by the application has good detection performance on BPA.

The present application relates to the technical field of high polymer material flame-retardant modification, and particularly relates to a COF hierarchical modification APP-based core-shell flame-retardant smoke suppressant, a preparation method and application thereof. The flame-retardant smoke suppressant takes APP as a flame-retardant core layer; takes PVP as a soft template agent, and assists in situ growth of melamine-p-phenylenedimethylene formaldehyde (COF) on the surface of APP to adsorb combustible volatile components in the initial pyrolysis stage, provide a gas source, and act as a Fe 3+ coordination skeleton; takes tannic acid as a coordination agent and a carbon source, and constructs a multi-level core-shell structure with Fe 3+ coordination. The present application realizes integration of flame-retardant and smoke suppression functions through hierarchical modification. When the flame-retardant agent is applied to polyurethane, it can significantly reduce the heat release rate, smoke release rate and toxic gas generation amount, and simultaneously improve the compatibility with the matrix, effectively overcoming the defects of poor compatibility and insufficient flame-retardant and smoke suppression performance of traditional APP flame-retardant agents. The present application has simple preparation process and controllable conditions, and is suitable for industrial production.

The application discloses a method for preparing polyethylene wax by using a carborane bridged rare earth metallocene catalyst, and simultaneously preparing a carborane bridged indenyl rare earth metallocene compound as a main catalyst, loading the prepared main catalyst and a cocatalyst on a magnetic mesoporous Fe3O4@Al2O3 core-shell nanoparticle carrier to obtain a supported rare earth metallocene catalyst; the main catalyst of the application is a carborane bridged indenyl rare earth metallocene compound with a structure shown in formula (I), wherein a bridging group adopts a closed carborane (closed-1,2-dicarbadodecaborane), and the cage-like three-dimensional structure has super-high thermal stability and chemical inertness and does not degrade or rearrange in a high-temperature molten state of 130-200 DEG C. Large-volume substituents such as methyl, tert-butyl, phenyl or 4-tert-butylphenyl are introduced on the indene ring to provide sufficient steric protection and further inhibit chain transfer and side reactions at high temperatures.

The invention discloses a preparation method of a nitrogenous supercapacitor carbonaceous electrode material. The preparation method comprises the following steps: mixing a carbon-rich precursor with KOH powder, and carbonizing to prepare activated carbon; and adding the prepared activated carbon into a urea aqueous solution or a melamine-ethanol solution for dipping, drying, and then carrying out carbonization treatment in a nitrogen atmosphere to obtain the nitrogen-containing supercapacitor carbonaceous electrode material. The preparation method is simple, the process is easy to control, the method is suitable for large-scale production, the surface and the bulk phase of the prepared carbonaceous electrode material are rich in nitrogen, the electron donating characteristic of a carbon matrix can be enhanced, the surface wettability of activated carbon is improved, the pseudocapacitance effect is generated, and then the energy density, the power density and the specific capacitance of the electrode material are improved.

The application discloses a DSP lock-free parallel clustering method based on adaptive division and boundary summary, comprising the following steps: obtaining original spatial point cloud data, determining a global calculation region and putting the global calculation region into a to-be-processed queue as a root node, and calculating the region potential energy corresponding to each region in the to-be-processed queue; when the regions in the to-be-processed queue are subjected to bisection cutting, final partitions are obtained; according to the final partitions, the original spatial point cloud data is traversed to obtain an extended data set and an index list of core attribution points; the index list of the extended data set is subjected to density clustering to obtain local clusters and a preliminary global cluster label vector; according to the triangle inequality, cluster summaries are screened and a union-find set is processed to obtain a union-find set result; and the union-find set result is mapped and converted into a continuous integer label to obtain a final clustering result. The application can realize a strictly consistent DBSCAN clustering effect on a multi-core DSP platform, and can meet the requirements of real-time performance, low communication overhead, scalability and high engineering reliability.

The invention relates to the technical field of aerogel microsphere preparation, in particular to a method for preparing composite nanocellulose aerogel microspheres based on electrostatic field auxiliary regulation and control. Comprising the following steps: forming uniform liquid drops from a silane modified nano cellulose suspension through an electrostatic spraying device provided with an annular electrode group and a real-time monitoring feedback system; the liquid drops are induced by an electrostatic field in a pre-cooling area to be initially set and then subjected to liquid nitrogen cryogenic treatment, gradient freeze drying is conducted, and aerogel microspheres are obtained; and finally, carrying out surface modification on the aerogel microspheres, and loading nano microspheres under the assistance of an alternating electric field to obtain the composite nano cellulose aerogel microspheres. Through the synergistic effect of the multi-stage electric field, accurate regulation and control on the whole process of microsphere forming, internal structure construction and functional compounding are realized, so that the composite nanocellulose aerogel microspheres with narrow particle size distribution, uniform size and adjustable functions are prepared, and the composite nanocellulose aerogel microspheres have wide application prospects in the fields of adsorption, catalysis, biological medicine and the like.

The present application relates to a kind of based on carbonized wood natural structure dopamine electrochemical sensor and its preparation method and application, the working electrode of the electrochemical sensor is modified with carbonized wood-ZnO nanowire-ZIF-8.The electrochemical sensor of the present application uses carbonized wood as substrate, after cutting carbonized wood whole piece, using conductive carbon paste is pasted on working electrode, while ensuring conductivity, also retain the three-dimensional structure of nanomaterial not be destroyed, guarantee the performance of sensor, with good application prospect.

The invention discloses an alloy catalyst as well as a preparation method and application thereof. The preparation method mainly comprises the following steps: loading a mixture containing a carbon nanotube and a noble metal precursor A on foamed nickel to prepare an electrode material; adding the electrode material into a precious metal precursor B solution, adjusting the pH value to 6.5-7.5, and carrying out a reaction to prepare an alloy catalyst; wherein the noble metal in the noble metal precursor A is Pt and / or Pd; the noble metal in the noble metal precursor B is one or more of Au, Ag and Hg. The alloy catalyst provided by the invention can enhance two-electron selectivity, nano spray is uniformly dispersed, and hydrogen peroxide is easy to prepare. Compared with a traditional single catalyst or an oxidized carbon nanotube catalyst, the alloy catalyst has the advantages that the reaction activity and selectivity are improved, and the output efficiency of hydrogen peroxide is greatly improved.

The present invention discloses an electrode material of a biomass-derived carbon composite transition metal sulfide solid solution, comprising a biomass-derived carbon skeleton with a three-dimensional network hollow tubular structure and transition metal sulfide solid solution nanoparticles loaded on the carbon skeleton; the electrode material has a chemical composition represented by ABX@BDC, wherein A and B are independently selected from one of transition metal elements Fe, Co, Ni, Cu, Mn, Zn and Sn, X is a non-metallic element S or Se, and BDC is a biomass-derived carbon skeleton. The electrode material prepared by the present invention has high specific capacity, excellent cycle stability and rate performance. And it has attractive reversible capacity, ultra-long cycle life and good structural stability at ultra-high rate. The raw material resources are abundant, the cost is low, the preparation process is simple, the time consumption is short, the reaction conditions are also very easy to achieve, and it can be mass-produced, convenient for commercial application, and shows great application prospects in sodium ion batteries.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for preparing a sponge iron-based ferrous silicate reducing agent for wastewater treatment. Sponge iron is activated in a dilute phosphoric acid solution to obtain activated sponge iron; the activated sponge iron is washed and then immersed in a ferrous solution, removed and washed, and then matured in a sodium silicate solution to obtain matured sponge iron; the matured sponge iron is washed and freeze-dried to obtain the sponge iron-based ferrous silicate reducing agent. The sponge iron-based ferrous silicate reducing agent prepared by this invention is easily separated from the effluent and has excellent and long-lasting reducing performance. It solves the problems of high reducing agent dosage, high salinity of the treated effluent, generation of large amounts of iron sludge, and the need for continuous addition of reducing agent in traditional reduction processes. Furthermore, the preparation method is simple, requiring no complex equipment or catalysts, and the raw material, sponge iron, is inexpensive and widely available, resulting in low production costs and suitability for large-scale preparation and engineering applications.

This invention discloses a method for preparing and applying chitosan-encapsulated CoCe layered double hydroxide CoCe-LDH. This material can achieve rapid and efficient degradation of roxarsone and removal of the resulting inorganic arsenic. In this material, LDH is encapsulated by chitosan, resulting in a sheet-like material. Chitosan can disperse active sites and adsorb and enrich PMS, while LDH can transfer PMS ions into the anion layer through anion exchange, thereby increasing the active sites. After coupling with the material, PMS is specifically converted to... 1 O2 accelerates the degradation rate.

Provided are: a method for manufacturing a secondary battery electrode in which thickness unevenness is reduced, such as due to sliding or a side ring; the present invention relates to a method for manufacturing a secondary battery electrode, and an apparatus suitable for performing the method for manufacturing a secondary battery electrode, which can minimize a slip deviation between a top surface and a back surface when the top surface and the back surface of a current collector are sequentially coated with a slurry. A method of manufacturing a secondary battery electrode according to the present disclosure includes a step of forming an artificial step in a current collector and applying an electrode active material on the step.

The invention discloses a nickel-based monatomic catalyst suitable for a glucose electrochemical sensor and preparation and application of the nickel-based monatomic catalyst. Bis (cyclopentadiene) nickel (II), melamine and a carbon-based nano material are mixed and ground uniformly, the mixture is dissolved in an organic solvent and magnetically stirred, and suspension passes through a rotary evaporator to obtain powder; and putting the obtained powder into a tubular furnace, calcining in non-reactive gas, acidizing and etching the obtained product by using an acid solution, and then centrifuging, washing and drying in vacuum to obtain the nickel-based monatomic catalyst. According to the nickel-based monatomic catalyst, nickel monatomic is attached to a carbon tube through the synergistic effect of nickel and nitrogen-doped carbon, the nickel-based monatomic catalyst has rich redox active sites, and reaction kinetics and electrocatalytic activity are enhanced. In glucose detection, the nickel-based monatomic catalyst material shows the sensitivity of 546.86 [mu] A / (mM.cm < 2 >), the detection limit of 0.24 [mu] M and the linear response range of 0.1-10 mM. The nickel-based monatomic catalyst provided by the invention has relatively high electrocatalytic activity, excellent selectivity, simple preparation method and low cost, and is suitable for large-scale production.

The invention relates to a copper monatomic carbon dot nano-enzyme with SOD (superoxide dismutase) enzyme activity as well as a preparation method and application thereof. The copper monatomic carbon dot nano-enzyme with the SOD enzyme activity is obtained by loading copper monatomic on the surface of a nitrogen-doped carbon quantum dot, and the copper monatomic is dispersed on the surface of the nitrogen-doped carbon quantum dot in the form of Cu < 2 + >. Various asymmetric C and N sites exist on the surfaces of the nitrogen-doped carbon quantum dots, the existence of N is beneficial to promoting Cu < 2 + > dispersion and reducing Cu < 2 + > agglomeration, stable Cu < 2 + > atomic-scale dispersion is realized through coordination of N and Cu < 2 + >, and the high activity, the stability and the metal economy of the copper monatomic carbon dot nano-enzyme with the SOD enzyme activity are ensured.

The present application discloses a kind of heavy die test press machines, including body frame, main oil cylinder, body frame is made of lower crossbeam, column and upper crossbeam.Key features include slider, lifting cylinder, motor, friction stopper and moving platform.Slider includes rotary slider, pressurized slider and side slider, wherein pressurized slider is installed in frame by guide rail, connected with main oil cylinder.Side slider moves up and down through guide assembly and guide rail, and double-side lifting cylinder drives its action.Rotary slider connects two side sliders through rotary shaft, and motor is installed on side slider, rotary motion is realized through driving gear and rotary gear.Moving platform is installed on lower crossbeam, used for installing lower die.Through innovative double-side synchronous drive and gear set driving, the test press machine improves system stability, rotary load capacity and test function, and provides significant technical advantage for large, heavy die test requirements.

The present invention provides a composite polymer porous membrane and a preparation method and application thereof, the preparation method comprising: mixing a first solvent, a second solvent, a polymer and hydrophilic inorganic particles to obtain a casting solution; the first solvent is a good solvent for the polymer, the boiling point of the first solvent is less than the boiling point of the second solvent, and the surface tension of the first solvent is less than the surface tension of the second solvent; the casting solution is coated on a support net to obtain a liquid film containing the support net; removing the first solvent in the liquid film to obtain a primary film; removing the second solvent in the primary film to obtain the composite polymer porous membrane. The preparation method is simple and easy to implement, and through the design and mutual compounding of the first solvent, the second solvent and a specific preparation process, a three-dimensional through structure with high porosity is formed in the obtained composite polymer porous membrane, which has the characteristics of high mass transfer efficiency, good gas isolation effect, high mechanical properties and low resistance, and fully meets the performance requirements of the alkaline water electrolyzer for the diaphragm.