45 results about "Microfiltration membrane" patented technology

The application discloses a preparation method of a heavy ion microporous composite filtration membrane and application thereof, and relates to the technical field of membrane separation preparation, wherein the preparation method comprises the following steps: step one, compounding a nuclear pore membrane on the upper side of a first base material; step two, preparing a casting solution, and then casting the casting solution on a second base material to form a nascent membrane after scraping; step three, performing a blowing operation on the nascent membrane to obtain a pre-phase separation membrane; step four, immersing the pre-phase separation membrane in a coagulation bath to perform a solidification operation, and obtaining a solidified membrane; step five, performing an area stretching operation on the solidified membrane, and then performing a cleaning operation in pure water, and then performing a drying operation after the cleaning operation to obtain a microfiltration membrane; and step six, compounding the microfiltration membrane on the upper side of the nuclear pore membrane to obtain a composite filtration membrane. The preparation method of the heavy ion microporous composite filtration membrane improves the liquid stopping effect, filtration flux and flux stability of the filtration membrane by compounding the first base material, the nuclear pore membrane and the microfiltration membrane.

This invention relates to a method for preparing an ultrafiltration membrane based on spray-deposited block copolymer nanofibers, comprising: dispersing block copolymer nanofibers with a diameter of 15-30 nm and a length of 500-2000 nm in a solvent to prepare a block copolymer nanofiber solution with a mass percentage concentration of 0.075-0.75%; uniformly spraying the obtained block copolymer nanofiber solution onto the surface of a microfiltration substrate membrane, controlling the spraying amount of the block copolymer nanofiber solution to be 0.025-0.08 mL / cm². 2 A composite ultrafiltration membrane is obtained. The membrane fabrication method provided by this invention is simple, easy to implement, clean, and efficient. Furthermore, the pore size and thickness of the separation layer of the obtained ultrafiltration membrane are adjustable, and the flux can be adjusted within a certain range.

The utility model relates to an integrated coal-fired power plant heavy metal-containing sewage treatment system and belongs to the technical field of water pollution control. The system is connected with a grit chamber, a microfiltration membrane filter, an ozone catalytic oxidation unit, a photocatalytic oxidation unit, an electrochemical oxidation unit, an ion exchange unit, a magnetic nano adsorption unit and an anaerobic biological filter in sequence through a water inlet through a grid. The anaerobic biological filter is connected with a membrane biological reactor and a reverse osmosis system through an aerobic biological reactor. The utility model system adopts compact design, has small land occupation, low operation cost, stable and efficient treatment effect, and the effluent quality reaches the national discharge standard or reuse requirement. The utility model not only significantly improves the removal efficiency of heavy metal ions, but also realizes energy recovery through sludge anaerobic digestion and biogas power generation, having remarkable environmental benefits and economic value.

This invention provides a microbubble generator and method, comprising a first section, a second section, and a third section. The first section is a Venturi tube structure with an ultrafiltration membrane at the air inlet for pre-shearing and pre-mixing of bubbles. The second section is a reverse Tesla valve principle flow channel, including at least two converging channels for further bubble shearing. The third section is a uniform mixing channel, connected to all flow paths of the second section and converging into a single channel for uniform dispersion of microbubbles, forming a microbubble fluid. This invention solves the problems of complex structure, uneven bubble size, and insufficient gas-liquid mixing in existing microbubble generators, offering advantages such as simple structure and the ability to produce uniformly sized and mixed gas-liquid particles.

A wastewater treatment system includes an aerobic / high purity oxygen membrane bioreactor. The MBR configured to intake influent wastewater and normal air or high purity oxygen and output effluent comprising sludge solids, carbon dioxide and partially treated water. The system includes an ultrafiltration / microfiltration membrane algal photobioreactor (algal-MPBR) in fluid communication with the MBR. The algal-MPBR is configured to intake the carbon dioxide and the partially treated water and output reuse water and an algal biomass. The system includes an anaerobic digester, the anaerobic digester in fluid communication with the MBR and the algal-MPBR. The anaerobic digester configured to intake the sludge solids and the algal biomass and output fertilizer, biogas and indirect potable water.

This utility model relates to the field of water treatment technology, and in particular to an integrated water treatment system suitable for extremely cold regions with temperatures as low as -60°C. The system includes a raw water collection tank, a heat exchanger, a static mixer, a self-cleaning filter, an ozone oxidation treatment unit, an air flotation unit, a thickening tank unit, a tubular microfiltration membrane device, a clear water tank module, and a pipeline network. The system is integrated within multiple standardized containers, with the water treatment equipment and components housed within the containers. The air flotation device and ozone catalytic tower are located in the external space. Through the integration of flocculation, self-cleaning filtration, ozone oxidation, air flotation, and tubular microfiltration processes, and employing a modular container design, the system is equipped with electric heating and composite insulation structures to achieve efficient decontamination and freeze protection. Simultaneously, the use of air flotation + flocculation + tubular microfiltration processes efficiently removes suspended solids, operates automatically, and is adapted to extremely cold environments. The pipelines and equipment utilize composite insulation technology to ensure stable operation at low temperatures.

This invention discloses a multi-stage combined membrane concentration device, relating to the field of membrane concentration technology. It includes a pretreatment module, a combined membrane concentration module connected to the pretreatment module, an evaporation module connected to the combined membrane concentration module, and a disc dryer connected to the evaporation module. Through an integrated process design of "pretreatment-combined membrane concentration-evaporation-drying," coupled with refined structural and material selection, it exhibits significant advantages in wastewater treatment efficiency, energy consumption control, operational stability, and environmental friendliness. The microfiltration membrane, ultrafiltration membrane, and nanofiltration membrane within the combined membrane concentration module form a graded system of "coarse filtration-fine filtration-desalination concentration," enabling gradient retention based on wastewater composition. The concentrated liquid retained by each membrane stage is collected through a concentrated liquid discharge pipe under the action of a second negative pressure suction pump, and then returned to the first inner cylinder via a return pipe, gradually increasing the concentration of the target substance in the concentrated liquid and significantly improving the filtration concentration rate.

This invention relates to the field of edible leaf grass powder processing technology, specifically to an edible leaf grass powder and processing technology, including the following steps: S100: Fresh tender stems and leaves of edible leaf grass are washed and sterilized, and then subjected to blanching, enzyme inactivation, drying, and pulverization to obtain fresh edible leaf grass powder; S200: The fresh edible leaf grass powder is mixed with water according to a set material-liquid ratio, alkali solution is added for purification, and a first solid-liquid separation is performed to obtain the supernatant; then acid solution is added to the supernatant to adjust to the isoelectric point for precipitation, and a second solid-liquid separation is performed to obtain protein precipitate, which is then washed with water to remove acid. This invention effectively overcomes the problems of enzymatic browning and protein thermal denaturation that are prone to occur in traditional edible leaf grass processing by constructing a technical system of precise blanching and enzyme inactivation combined with gentle extraction and purification; combined with microfiltration membrane physical impurity removal and a specific anti-sticking spray drying formula, the purity of the target product and the industrial powder collection rate are greatly improved.

This invention relates to the field of mercerizing machine wastewater treatment technology, specifically a multi-stage membrane separation treatment device for mercerizing machine wastewater, comprising: a centrifugal filtration assembly, a pressurizing assembly, and a multi-stage membrane filtration assembly arranged sequentially from the inside out; the centrifugal filtration assembly includes a centrifugal filter drum and filter cake conveying spiral blades arranged on the inner wall of the centrifugal filter drum and rotating with the centrifugal filter drum, so that the filter cake is conveyed and discharged by the filter cake conveying spiral blades. This invention utilizes the relative rotation between the centrifugal filter drum and the filter cake conveying spiral blades to allow the filtrate to penetrate the centrifugal filter drum and enter the area between the centrifugal filter drum and the storage pipe. The filter cake, due to the relative rotation between the centrifugal filter drum and the filter cake conveying spiral blades, is finally discharged from the guide hopper. Simultaneously, the filtrate sequentially passes through a microfiltration membrane cartridge, an ultrafiltration membrane cartridge, and a reverse osmosis membrane cartridge, improving the filtration effect of the water and preventing unstable water quality after filtration.

The present application relates to the technical field of dairy processing, in particular to a fermented milk and a preparation method thereof. The preparation method comprises the following steps: separating skimmed milk by using a microfiltration membrane and / or an ultrafiltration membrane to obtain casein liquid and whey protein liquid; controlling the lactose content in the whey protein liquid to be less than 5%, and then performing microparticulation on the whey protein liquid to obtain microparticulated whey protein; and taking the microparticulated whey protein, the casein liquid and whipped cream as fermentation raw materials to obtain fermented milk. The fermented milk product prepared by the preparation method has a smooth taste and no obvious powder or particle feeling. Moreover, the texture and rheological properties of the final product can be controlled by adjusting the microparticulation process parameters, so that different types of fermented milk products can be developed by enterprises, and the present application is suitable for popularization and application.

This application relates to a method for extracting xylose and glucose from straw sugar raw materials. The method includes: S1. Filtering the straw sugar raw materials obtained by enzymatic hydrolysis through a microfiltration membrane to obtain a straw sugar clear liquid; S2. Filtering the straw sugar clear liquid obtained in S1 through a nanofiltration membrane to obtain a straw sugar nanofiltration membrane clear liquid; S3. Subjecting the straw sugar nanofiltration membrane clear liquid obtained in S2 to decation treatment, decolorization treatment, and reverse osmosis concentration treatment to obtain a first processed liquid; S4. Subjecting the first processed liquid to electrodialysis desalination treatment and a second concentration treatment sequentially, or directly subjecting the first processed liquid to a second concentration treatment to obtain a second processed liquid; S5. Subjecting the second processed liquid to ion exchange treatment and a third concentration treatment sequentially to obtain a third processed liquid; S6. Chromatographically separating the third processed liquid in a chromatographic system to obtain a first extract rich in glucose and a second extract rich in xylose. This method yields a refined glucose mixture and xylose crystals with high yield and low conductivity, suitable for use in fermentation production, food additives, etc.

This invention relates to the field of fermentation broth treatment technology, specifically disclosing a ceramic microfiltration membrane pressure control system for fermentation broth treatment. The system includes a data acquisition module, used to collect concentration data of various suspended particles in the fermentation broth at fixed time intervals during the fermentation broth treatment process. By combining optical interference parameters and fermentation broth state parameters during the fermentation broth treatment process, the concentration data of various suspended particles in the fermentation broth is corrected, making the collected concentration data of various suspended particles closer to the true values. Then, this data and the deposition data of various suspended particles are used to analyze the filtration resistance of the fermentation broth, thereby realizing the subdivision and processing of the turbidity data of the fermentation broth. Based on the deposition characteristics of different particles, the deposition situation can be precisely controlled, which can reduce irreversible fouling of the membrane and optimize the filtration pressure operation parameters of the membrane filtration, thereby optimizing the filtration pressure adjustment strategy.

The application discloses a kind of hollow fiber microfiltration membrane and its preparation method, including the following steps: spinning solution and core liquid are co-extruded by hollow fiber spinning spinneret, preliminary phase conversion is formed, and primary hollow fiber membrane filament is obtained;The primary hollow fiber membrane filament is washed by multiple stages, and the hollow fiber microfiltration membrane is obtained after drying.The gradient temperature difference of washing and the residence time of primary hollow fiber membrane filament in each stage of washing are controlled, so that the full elution of pore-forming agent and the directional migration and enrichment of hydrophilic additive to the membrane surface can be realized simultaneously, the membrane filament after washing can be directly dried, no additional elution post-processing step is needed in the whole process, the loss of hydrophilic additive is not caused, and the obtained hollow fiber microfiltration membrane can maintain good hydrophilicity and reduce membrane pollution phenomenon.

Provided is an organic wastewater treatment device and an organic wastewater treatment method that can reduce the amount of methane dissolved in membrane-filtered water and increase the amount of methane recovered when anaerobically treating organic wastewater in a membrane separation methane fermentation tank. The organic wastewater treatment device includes: a first treatment device (20) that performs methane fermentation on organic wastewater (W1) containing suspended matter, organic matter, and nitrogen components under anaerobic conditions and performs membrane filtration using a microfiltration membrane or an ultrafiltration membrane to obtain membrane-filtered water (W2); a second treatment device (30) disposed on the downstream side of the first treatment device (20) and including a vacuum degassing device (32) that removes and recovers a portion of the dissolved methane in the membrane-filtered water (W2); and a third treatment device (40) disposed on the downstream side of the second treatment device (30) and performing post-treatment.

This invention provides a method for preparing plant nanovesicles derived from pepper. The method involves: crushing washed pepper fruits, enzymatically hydrolyzing them, and then sequentially filtering the crude extract of pepper nanovesicles obtained from the enzymatic hydrolysis through a coarse filter, a microfiltration membrane, and a microporous membrane to obtain a filtrate. The filtrate is then centrifuged to obtain the plant nanovesicles derived from pepper. This invention also provides an application of the prepared plant nanovesicles derived from pepper for the preparation of drugs to improve peripheral nerve injury. The plant nanovesicles derived from pepper of this invention possess anti-inflammatory, analgesic, and nerve-repairing activities, easily penetrate tissue barriers, and promote the absorption and targeted delivery of active ingredients.

The application discloses a kind of multilayer structure biomimetic membrane and its preparation method and application, belong to filtration membrane technical field.The biomimetic membrane of the application is composed of top layer SWCNT membrane, intermediate layer microfiltration membrane and bottom layer PP grid support insert piece, SWCNT membrane contains 1~3 layers of single-layer membrane with 2~100nm pore size, arranged in order according to pore size from big to small.The preparation method is as follows:SWCNT dispersion is prepared, SWCNT monolayer membrane is loaded on the surface of microfiltration membrane after hydrophilic modification by subsection vacuum filtration, and PP grid insert piece is prepared after hot pressing and pasting after concentrated nitric acid treatment.The biomimetic membrane can be applied to microchannel device, the difference between SWCNT membrane and microfiltration membrane is used, and the pore size is reversibly changed by temperature control, the synchronous capture and elution purification of different particle size biological macromolecules are completed, and the purification efficiency of biological macromolecules can be significantly improved.

The application belongs to the technical field of haematococcus pluvialis membrane separation, and particularly relates to a microfiltration membrane module for separating haematococcus pluvialis broken wall liquid and application thereof. The hollow fiber membrane bundle is composed of polyvinylidene fluoride hollow fiber membranes with surface grafted amphiphilic ion copolymer, the amphiphilic ion copolymer is carboxylated sulfobetaine type amphiphilic ion copolymer, the repeating unit of the copolymer contains quaternary ammonium salt positive charge group, sulfonate negative charge group and side chain carboxyl group at the same time, and the amphiphilic ion copolymer is grafted on the polyvinylidene fluoride base membrane surface through covalent bond. The microfiltration membrane module is used for separating haematococcus pluvialis broken wall liquid. The application realizes high-efficiency and stable operation without frequent chemical cleaning in the separation of haematococcus pluvialis broken wall liquid by synthesizing carboxylated sulfobetaine type amphiphilic ion copolymer and anchoring on the membrane surface through covalent bond, constructing stable anti-pollution interface with hydration layer and electrostatic double repulsion, and regulating membrane pore size with single external coagulation bath temperature.

The application belongs to the technical field of membrane separation, and particularly relates to an asymmetric microfiltration membrane and a preparation method and application thereof. The application has a pore size change trend by setting a pre-filter layer, so that the flux effect of the microfiltration membrane can be improved. When a large-pore surface is used as a liquid inlet surface of the microfiltration membrane, the flux of the microfiltration membrane can be further improved. The fiber inside the communication pores in the asymmetric microfiltration membrane has pores, and the fiber has excellent buffering performance due to the pores in the fiber, so that the impact resistance of the microfiltration membrane can be improved, and the microfiltration membrane is not easy to be damaged. The fiber inside the region close to the large-pore surface is provided with pores, so that the diameter of the fiber can be increased to improve the strength, and the flux of the membrane will not be affected due to the distribution region mainly in the pre-filter layer, but the pressure resistance and shock resistance of the pre-filter layer can be improved, so that the microfiltration membrane has excellent mechanical strength as a whole, and safe and efficient filtration for a long time is provided.

The utility model relates to microfiltration membrane detection technical field, concretely is a kind of microfiltration membrane test bubble point clamping device.The utility model, including: holder base, the arc surface of holder base lower end is equipped with bracket seat;Three support rods, three support rods are located below bracket seat;And adjusting structure;Three support rods are connected with bracket seat by adjusting structure;Wherein, the inside of holder base is equipped with porous support plate, the upper surface of porous support plate is placed with porous support screen, the upper surface of porous support screen is placed with test diaphragm, the upper surface of holder base is placed with holder upper cover, the inside of holder upper cover is equipped with several bolt bodies, bolt body is connected with holder base screw thread, the inner wall of holder upper cover is equipped with inlet, the lower surface of holder base is equipped with outlet, the inside of holder upper cover is equipped with exhaust bolt.The problem that existing clamping device is prone to extrude deformation of filter screen is solved.

The utility model relates to a microfiltration membrane dust test system relates to microfiltration membrane dust test equipment technical field, the utility model discloses a test bench, two test bench plates are installed to the inner wall of test bench, test mechanism, test bench one side is equipped with test mechanism and auxiliary mechanism, and test mechanism one side is installed with auxiliary mechanism, wherein, test mechanism includes three assembly frames, and three assembly frames all are fixedly connected with test bench one side. The utility model provides a kind of microfiltration membrane dust test system with in dust tank adding dust of specific concentration and particle size distribution, after stirring evenly, it is sent into test pipeline, under the action of pressure, dust-containing airflow passes through filter membrane fixed on filter membrane, dust is intercepted, gas permeates filter membrane, pressure sensor monitors the pressure change before and after filter membrane, and flow control system ensures that gas flow is stable, data acquisition unit analyzes pressure, flow and other data, obtains the performance parameter advantages such as filtration efficiency, pressure drop, air permeability of filter membrane.

The application relates to the technical field of carbon nanotubes, and particularly discloses a carbon nanotube purification method. The carbon nanotube purification method comprises the following steps: (1) weighing carbon nanotube crude products and various raw materials; (2) adding the carbon nanotube crude products and a surfactant into deionized water to perform ultrasonic dispersion, so as to obtain a dispersion liquid; (3) performing gradient centrifugation on the dispersion liquid, and taking upper suspension; (4) mixing hydrochloric acid and nitric acid with the suspension to treat the carbon nanotubes; (5) treating the carbon nanotubes with dilute acid, mildly oxidizing the carbon nanotubes through a low-concentration hydrogen peroxide solution, and then adsorbing magnetic impurities in a magnetic field; (6) performing cross-flow filtration through a polycarbonate microfiltration membrane, and collecting the treated carbon nanotubes; and (7) performing inert gas annealing on the treated carbon nanotubes, and performing freeze drying, so as to obtain purified carbon nanotubes. The purification method can efficiently remove metal catalysts, amorphous carbon and graphite impurities, and meanwhile, the tube wall integrity of the carbon nanotubes is maintained.

This invention relates to the field of chemical separation and purification technology, and discloses a membrane separation, enrichment, and low-temperature crystallization purification process for 4-BMA mother liquor. The process includes mother liquor pretreatment and pH adjustment, primary nanofiltration membrane enrichment and isomer separation, secondary ultrafiltration membrane impurity removal, acid adjustment and conversion, gradient low-temperature crystallization, solid-liquid separation, and drying to obtain high-purity 4-BMA. By sequentially employing a combination separation process of ceramic microfiltration membrane, primary nanofiltration membrane, and secondary ultrafiltration membrane, impurities can be effectively removed, significantly improving the purity of 4-BMA. The use of a composite amine regulator successfully reduces isomer residue in the finished product. The use of a three-stage gradient programmed cooling to induce crystallization significantly reduces the encapsulation and residue of high-molecular impurities. This process solves the problems of low recovery rate of 4-BMA crystallization mother liquor and the difficulty in simultaneously removing isomers and high-molecular impurities.

This invention belongs to the field of ammonia-soda process soda ash production technology, specifically relating to a method for preparing low-turbidity refined brine. The method involves sending calcium-removed brine into a clarification tank for clarification and sedimentation to obtain a supernatant, which is then pressurized and filtered through a microfiltration membrane device to obtain low-turbidity refined brine. The microfiltration membrane device includes a first chamber and a second chamber. Several high-density polyethylene microfiltration membrane filter elements are vertically arranged in the second chamber to connect the first and second chambers. The microfiltration membrane filter element has a double-layer structure including a filter layer and a support layer. This invention utilizes an asymmetric double-layer rigid membrane material sintered from high-density polyethylene of different particle sizes to form a precise pore size filtration channel. Combined with an efficient backwashing mechanism of online gas washing and acid washing, this achieves long-cycle, low-cost operation of the device.

The utility model relates to a kind of phenolic wastewater treatment catalytic / filter coupling device, it relates to a kind of phenolic wastewater treatment device.The utility model is to solve the technical problems that the existing catalytic oxidation-membrane separation coupling process exists unit long, catalyst loss and membrane pollution.The utility model first couples sludge biochar catalytic oxidation and microfiltration membrane in same device, with integrated design significantly shorten process, reduce dead volume and energy consumption;Through the three-stage gradient interception structure of hierarchical aperture metal screen-PP cotton-microfiltration membrane, form the particle size barrier from bottom to top, synergistically inhibit the loss of sludge biochar and membrane pollution, so that sludge biochar maintains high activity in continuous operation, to ensure water quality while extending the stable operation period of system, provide new technical paradigm for the economic and efficient advanced treatment of phenol-containing wastewater.

This invention belongs to the field of beer brewing and provides a process for making kapok flower beer, including: drying and pulverizing fresh kapok petals at low temperature to obtain kapok flower powder, and collecting the pollen for later use; mixing the kapok flower powder with brewing water and using ultrasonic-assisted low-temperature extraction to obtain kapok flower extract; mixing malt powder with brewing water for protein rest and stepwise temperature-increased saccharification, adding kapok flower extract in the later stage of saccharification for joint temperature maintenance; boiling and cooling the saccharified wort and then inoculating it with yeast for low-temperature pre-fermentation; adding a mixture of kapok flower extract and pollen treated with a 0.45μm filter membrane for sterilization before sealing, and then maturing under pressure; filtering the matured beer through a 0-2℃ low-temperature microfiltration membrane and bottling in an anaerobic environment. This invention effectively solves the problems of easy aroma loss, bitter taste, and microbial instability in existing flower beers through the synergistic effect of ultrasonic low-temperature extraction, staged multi-node addition, and double sterilization filtration. The finished beer has a rich floral aroma, a refreshing and sweet taste, and is rich in flavonoid active substances.

The present invention relates to a porous microfiltration membrane and a manufacturing method therefor. The manufacturing method according to the present invention is a method for manufacturing a microfiltration membrane having excellent permeation flux and is based on use and composition of glycol-based and inorganic salt additives, which are various viscosity-increasing additives. Provided are: a polymer composition comprising a polymer and various viscosity-increasing additives for forming pores on the surface of a membrane; a porous microfiltration membrane obtained by casting the polymer composition, exposing same under appropriate temperature and constant humidity conditions for several minutes, and then immersing same in a non-solvent; and a method for manufacturing the porous microfiltration membrane.

This invention discloses a method for removing solid impurities from acidic gas, relating to the field of acidic gas impurity removal. Through a synergistic process of low-temperature plasma pretreatment, multi-stage gradient washing with a composite chelating agent, graded gas-liquid separation, and deep purification via membrane filtration, a stepwise and efficient removal of solid impurities is achieved. Low-temperature plasma pretreatment disrupts the adsorption membrane on the surface of solid impurities and weakens the binding force between ammonia and impurities, laying the foundation for subsequent separation. The composite chelating agent, through graded addition and dynamic replenishment, precisely captures solid impurities and ammonia at different temperature ranges. The graded cross-flow filtration of ceramic microfiltration membranes and organic ultrafiltration membranes deeply removes solid particles, effectively preventing scaling and blockage in downstream pipelines, ensuring continuous operation of the acidic gas treatment unit, and solving a key technical bottleneck restricting the stable operation of the acidic gas recovery process from refinery wastewater.

The application relates to a high-flux polyvinylidene fluoride microfiltration membrane with a support and a preparation method thereof, which comprises the following steps: S00, polyvinylidene fluoride powder, polyvinylpyrrolidone or a copolymer thereof, polymethyl methacrylate, a non-solvent reagent, a volatile reagent and an organic solvent are mixed and dissolved into a homogeneous solution, and a PVDF blending casting solution is prepared through the homogeneous solution; S10, a PET non-woven fabric is used as a support layer, the PVDF blending casting solution is scraped and coated on the support layer to form a plate PVDF microfiltration membrane with a nascent support layer, and pre-evaporation and water coagulation bath treatment are carried out; S20, the plate PVDF microfiltration membrane is soaked in a post-treatment solution, and after reaction is completed, hydrophilic effect persistence treatment is carried out to obtain a plate PVDF microfiltration membrane with persistent hydrophilicity. The preparation method is simple in process, raw materials are easy to obtain, and the method is economic and efficient, and can realize large-scale industrial production.