30results about How to "Aperture adjustable" patented technology

The invention provides a negative electrode lithium supplement agent, a preparation method and application of the negative electrode lithium supplement agent in a lithium ion battery, the negative electrode lithium supplement agent comprises a metal organic framework, lithium nanoparticles and a thin carbon film, and the metal organic framework and the lithium nanoparticles are packaged in the thin carbon film in situ. The negative electrode lithium supplement agent has higher safety performance, conductivity and stability, and can effectively prevent the safety problem caused by high activity of lithium powder.

The invention discloses a flexible three-dimensional MOF (Metal Organic Framework) array SERS (Surface Enhanced Raman Scattering) substrate and a preparation method thereof. The flexible three-dimensional MOF array SERS substrate comprises a flexible substrate, a three-dimensional MOF periodic array layer and a gold nanoparticle film which are sequentially arranged from bottom to top. The three-dimensional ordered MOF periodic array structure on the substrate can provide more attachment points for the gold nanoparticles, and high-density hot spots are formed; meanwhile, the MOF material has the advantages of high porosity, large specific surface area, adjustable aperture and the like, and can adsorb and capture a target analyte, so that to-be-detected molecules are concentrated and enriched in a hot spot region, and finally, the SERS activity is improved. The SERS substrate is a flexible substrate and can be directly attached to the surface of a complex to-be-detected object, and in-situ detection is achieved. The method has the characteristics of high sensitivity, good repeatability and wide applicability, and provides important support for rapid detection in food safety and environment monitoring.

The invention discloses a composite material catalyst MFe2O4 / NH2-MIL-68 (In)-x as well as a preparation method and application thereof, and belongs to the technical field of industrial catalysis. NH2-MIL-68 (In) is used as a carrier, spinel type ferrite MFe2O4 is loaded on the NH2-MIL-68 (In) to form the composite material catalyst, M represents Co or Cu, x represents the percentage content of MFe2O4 in the composite material, the value of x is 10-60, and the unit is%. Through effective compounding of the indium-based MOF material and the spinel type ferrite MFe2O4, the advantages of large specific surface area and multiple metal active sites of the indium-based MOF material and the spinel type ferrite MFe2O4 are fully utilized, the synergistic effect of the indium-based MOF material and the spinel type ferrite MFe2O4 in the aspects of gas adsorption and catalytic hydrolysis is exerted, the COS hydrolysis catalytic activity and the reaction rate are improved, the removal rate of COS in waste gas at 120-150 DEG C can reach 92-96%, and the removal rate of COS in waste gas at 120-150 DEG C can reach 92-96%. The catalyst is suitable for medium and low temperature catalytic hydrolysis removal of carbonyl sulfide in benfenacet synthesis waste gas.

The invention relates to the technical field of gas separation materials, in particular to a preparation method of a high-selectivity functionalized ZIF-7-8 mixed matrix membrane. The preparation method comprises the following steps: taking pebax-1657 as a matrix material of a mixed matrix membrane, synthesizing a ZIF-7-8 filling material by virtue of a non-solvent induced crystallization (NSIC) method, then carrying out ionic liquid impregnation on ZIF-7-8, and finally preparing the high-performance mixed matrix membrane in a blending manner, so as to obtain the functional modified ZIF-7-8 mixed matrix membrane material. 1-butyl-3-methylimidazole bis (trifluoromethanesulfonyl) imide salt ([bmim] [Tf2N]) is adopted as an ionic liquid, ZIF-7-8 is subjected to functionalization treatment through a post-synthesis method, and the ionic liquid with high affinity to CO2 is loaded in a nanomaterial pore cage, so that the adsorption capacity of the material to CO2 is improved, and the performance of the membrane material is further optimized; therefore, the purpose of improving the CO2 separation performance of the mixed matrix membrane is achieved.

This invention belongs to the field of fluorescent detection materials technology, specifically disclosing an open-type colorimetric fluorescent covalent organic polymer and its preparation and application. The preparation includes the following steps: dissolving 4,4',4''-(1,3,5-triazine-2,4,6-triyl)tris(2,6-dimethylaniline) and trialdehyde-resorcinol in 1,4-dioxane; uniformly adding acetic acid via ultrasonication; degassing three times using a refrigerated pump followed by heating reaction; sequentially washing with tetrahydrofuran and dichloromethane using a Soxhlet washing method; drying; passing through a 200-mesh sieve; and dry grinding. This invention utilizes the aforementioned open-type colorimetric fluorescent covalent organic polymer and its preparation and application. This open-type colorimetric fluorescent covalent organic polymer reacts sensitively with aminourea and 3,5-dinitro-2-hydroxyphenylenehydrazine, and can be used in open-type fluorescent chemical sensors to reduce the influence of other impurities on the detection results, thereby improving the detection sensitivity.

The embodiment of the present application relates to a kind of copper intermetallic compound porous materials and its preparation method and application, wherein, preparation method includes: metal Mg, Zn, Cu, M is mixed, is handled by induction smelting, and MgZnCuM alloy ingot is obtained;MgZnCuM alloy ingot is treated by spinning, and MgZnCuM precursor is obtained;MgZnCuM precursor is placed in gas phase de-alloying system and is treated by first vacuum heat treatment, and copper intermetallic compound porous material MgCuM is obtained;MgCuM has double continuous structure.The preparation method is simple and easy to operate, pore size is adjustable, and pore distribution is uniform, and the preparation process is environment-friendly and pollution-free.

The invention discloses a dsRNA nano preparation for preventing and controlling phytophthora capsici as well as a preparation method and application of the dsRNA nano preparation. The nucleotide sequence of the phytophthora capsici sugar transporter protein HXT4 gene is as shown in SEQ ID NO.1, and the ASPN-dsRNA nano preparation is obtained by mixing dsRNA as shown in SEQ ID NO.2 and amino-modified mesoporous silica. By exogenous application of the ASPN-dsRNA nano preparation, gene expression silencing of the target gene phytophthora capsici sugar transporter HXT4 is induced, so that pathogenicity of phytophthora capsici is reduced or even lost, and the purpose of protecting crops is achieved. The preparation can effectively reduce the pathogenicity of phytophthora capsici, the inhibition rate on phytophthora capsici infection can reach 72%, and the prevention and control efficiency on phytophthora capsici reaches 87%. The ASPN-dsRNA nano preparation is high in stability and obvious in prevention and control effect, and provides a new prevention and control strategy and means for developing a precise prevention and control method for crop epidemic diseases.

The present application relates to the technical field of composite material pressing die, in particular to a modular sample preparation die for drum peel test and a sample preparation method thereof, wherein the modular sample preparation die comprises, sequentially stacked in the vertical direction: an upper die plate, an intermediate cavity plate and a lower die plate, and a hole forming pin; the intermediate cavity plate is provided with a main cavity penetrating through itself in the vertical direction, at least one end of the main cavity is provided with an extension cavity communicating with itself in the horizontal direction, and the extension cavity does not penetrate the intermediate cavity plate in the vertical direction; the hole forming pin penetrates at least the upper die plate and the intermediate cavity plate, and is inserted into the interior of the extension cavity. The present application can directly form a drum peel test sample with a hole at one time; the position, aperture and pitch of the clamping hole are adjustable, and no flash is formed between the main body and the extended end of the drum peel test sample.

This invention relates to the field of nanomaterials technology, specifically to a method for preparing silica using continuous flow. The method involves mixing an organic base, a surfactant, and water to obtain solution A; mixing a silicon source and an organic solvent to obtain solution B; reacting solutions A and B through a continuous flow apparatus, separating the solid product, and calcining it to obtain silica; wherein the flow rates of solutions A and B are 5-10 mL / min, and the reaction temperature is 20-45℃. In this method, silica is prepared using a continuous flow process, and the prepared silica has a nanosphere morphology with a specific surface area of ​​200-800 m². 2 / g, with a pore size distribution of 2-50 nm and a particle size distribution deviation (PDI) of less than 2%.

The present invention provides a plastic powder feeding device, which relates to the field of plastic powder processing technology. The plastic powder feeding device comprises a box, a reciprocating mechanism, an adjusting mechanism, a screening mechanism and a conveying mechanism. The output end of the reciprocating mechanism is provided with a connecting gear, the upper side of the connecting gear is meshedly connected with a first rack fixedly connected to the inner wall of the box, the lower side of the connecting gear is meshedly connected with a second rack slidably connected to the inner wall of the box, the right end of the second rack is fixedly connected with a dividing hopper, the interior of the box is provided with two synchronous and reversely rotating crushing rollers, the adjusting mechanism drives the two crushing rollers to adjust the spacing, the inner bottom side of the box is provided with an upper screen plate and a lower screen plate, the screening mechanism drives the upper screen plate and the lower screen plate to reciprocate synchronously and reversely, and realizes the adjustment of the moving distance. The present invention can crush and screen materials while ensuring the linkage of the overall device, and the subsequent feeding effect is good.

The invention belongs to the field of alumina powder preparation, and particularly relates to a method for preparing spherical Al2O3 nanocrystals at low temperature, which mainly comprises the following steps: S1, preparing a porous material; s2, preparing a carboxyl precursor; s3, preparing an aluminum oxide precursor; and S4, calcining the precursor to obtain the spherical nano aluminum oxide. The preparation method comprises the following steps: grafting carboxyl into a porous material to obtain a carboxyl precursor material, adsorbing boehmite with a proper particle size on the surface of a pore channel by virtue of a relatively large specific surface of the porous material, replacing an aluminoxane precursor with carboxylic acid, and decomposing or carbonizing the carboxyl precursor by virtue of subsequent one-step high-temperature pyrolysis, so as to obtain the porous material. Partially decomposed long-chain organic groups or degraded carbides thereof can inhibit too fast growth of aluminum oxide particles and reduce the transformation temperature of an alpha-Al2O3 phase, and spherical nano alpha-Al2O3 with the size of 20-30 nm can be obtained.

The invention discloses a preparation method of a mesoporous titanium dioxide nano composite material coated with iron oxyhydroxide. The preparation method comprises the following steps: preparing a FeOOH (at) mTiO2 nano composite material, taking FeCl3. 6H2O as a precursor, taking tetrabutyl titanate as a titanium source, and taking ammonia water as a pore regulator. As a nano composite material, the nano composite material is used for capturing exosomes and is combined with an electrochemical sensor to establish a method for quantitatively detecting the exosomes. The method for quantitatively detecting the exosome by the electrochemical sensor, which is simple to operate and high in sensitivity, is realized by taking the FeOOH (at) mTiO2 nano composite material as an electrode material.

The invention is applicable to the technical field of electrocatalysis, and provides a preparation method of a nitrogen-doped carbon nanotube (NCNT) packaged CoCu bimetallic electrocatalyst, which comprises the following steps: cleaning carbon cloth (CC); the preparation method comprises the following steps: dissolving Co (NO3) 2.6 H2O and CuCl2. 2H2O in deionized water, dissolving 2-methylimidazole in deionized water, mixing the two solutions, immersing a CC substrate in the mixed solution, and standing at room temperature; cleaning the obtained product, and drying the product to obtain CoCu-MOF / CC; and putting the CoCu-MOF / CC into a porcelain boat, putting the porcelain boat containing a melamine ethanol solution in front of the CoCu-MOF / CC, and heating and calcining to obtain the CoCu-coated NCNT / CC. The invention further provides the nitrogen-doped carbon nano tube packaged CoCu bimetallic electrocatalyst and application of the nitrogen-doped carbon nano tube packaged CoCu bimetallic electrocatalyst. According to the preparation method, MOF is selected as a template, CoCu-MOF grown on a CC substrate in situ is taken as a precursor, alloy particles are packaged in a carbon layer through a coating effect, so that agglomeration and corrosion of an alloy catalyst are effectively avoided, pyrolysis in-situ conversion is performed under the assistance of melamine, an electronic structure is adjusted, a reaction energy barrier is reduced, excellent activity and durability are realized, and OER catalytic activity is efficiently promoted.

A temperature-responsive water harvesting hydrogel and a preparation method thereof, the water harvesting hydrogel is composed of N-isopropyl acrylamide, N,N,N',N'-tetramethylene ethylenediamine, N,N-methylene bisacrylamide, polyethylene glycol, ammonium persulfate and black titanium dioxide. The temperature-responsive water harvesting hydrogel of the present application combines the adjustable pore size of hydrophilic polyethylene glycol, the temperature response characteristics of N-isopropyl acrylamide and the excellent light-heat conversion performance of black titanium dioxide nanoparticles, and can be used as an efficient solar "switch". The temperature-responsive water harvesting hydrogel of the present application has good ability to remove pollutants tetracycline in water and sterilization ability under sunlight; has excellent water harvesting capacity; can realize self water harvesting-release cycle, thereby significantly improving water use efficiency and reducing water resource waste.

The invention relates to the technical field of sound source localization microphone array design, in particular to a multi-band sound source localization microphone array mounting device. The installation device comprises a center array disc, the center array disc comprises a supporting ring and a supporting disc arranged in the center, the supporting ring and the supporting disc are connected through a plurality of spirally-distributed array supporting arms, the array supporting arms are in central symmetry, and the outer side of the supporting ring of the center array disc is detachably connected with one end of an array main supporting arm. The array main supporting arms correspond to the array supporting arms in a one-to-one mode, and the other ends of the array main supporting arms are detachably connected with the array secondary supporting arms. According to the invention, the aperture of the microphone array can be adjusted, the aperture of the microphone array can be changed along with the change of the sound source positioning frequency, the array with various array apertures can be obtained through the disassembly and assembly of the array main support arm and the array secondary support arm, the aperture of the microphone array is increased in a stepped manner, and the stepped expansion of the positioning frequency band is realized.

This invention relates to medical-grade polyetheretherketone (PEEK) composite materials, their preparation method, and human bone implants, belonging to the field of medical materials technology. It addresses the limitations of existing human bone implants in promoting bone tissue regeneration and repair, as well as their poor antibacterial properties. The composite material comprises 1000 parts PEEK powder, 100-500 parts of HAP-modified ZIF-8 composite material after sizing, 1-3 parts of silane coupling agent, and 2-5 parts of calcium stearate. The sizing-treated HAP-modified ZIF-8 composite material is obtained by reacting HAP, methylimidazole, and anhydrous zinc nitrate in a DMF solution of polyetherimide; wherein HAP comprises 3-21 parts, methylimidazole 100-350 parts, and anhydrous zinc nitrate 120-380 parts. This invention can be used in human bone implants, possessing antibacterial properties, strong binding ability to bone cells and tissues, and the ability to promote the regeneration and repair of bone cells and tissues, showing broad application prospects in the medical field.

The invention belongs to the field of biological materials, and particularly discloses a cytoskeleton and leather prepared from the cytoskeleton, and the cytoskeleton is prepared by a preparation method comprising the following steps: mixing polysaccharide-containing hydrogel with a cross-linking agent solution to obtain a mixed solution; forming the mixed solution at 0-10 DEG C to obtain the cell scaffold, the temperature of the polysaccharide-containing hydrogel and / or the crosslinking agent solution is-40 DEG C to-10 DEG C. The preparation method of the cell scaffold is simple, efficient and wide in raw material source, complex equipment is not needed in the preparation process, and large-scale mass production can be achieved; according to the preparation method of the cell scaffold, the ice crystal pore-forming principle is utilized in the preparation process, a large number of through pore channels can be formed in the cell scaffold, no pore-forming agent needs to be used, and a series of problems caused by using the pore-forming agent can be avoided.

The application discloses a kind of solid supported copper-based N-heterocyclic carbene catalytic materials and preparation method and application thereof, and it is related to material synthesis technical field.The preparation method of the catalytic material includes: cuprous oxide is reacted with N-heterocyclic carbene ligand containing bromine group in solvent, and copper-based N-heterocyclic carbene complex is formed;The complex is subjected to Sonogashira coupling reaction with alkyne compound under the action of catalyst, and bromine group on the complex is coupled with alkyne compound and occurs copolymerization, forms porous organic polymer skeleton, and copper-based N-heterocyclic carbene complex is distributed in the skeleton, and solid supported copper-based catalytic material is obtained;Wherein alkyne compound is selected from 1,3,5-triethynylbenzene or 1,3,5-tri (4-ethynylphenyl) benzene.The obtained catalytic material has porous organic polymer skeleton, and copper active species is uniformly distributed in the whole material, belongs to heterogeneous catalytic material, is easy to separate and recycle, can be recycled, and shows excellent catalytic performance in alkyne alkylation reaction of trifluoromethyl ketone.

The utility model relates to a kind of fruit and vegetable juice extraction equipment, belong to fruit and vegetable juice processing technical field.The equipment aims at the problem of laborious and inconvenient cleaning of manual juice extraction, provides a kind of solution.Equipment includes base, fixed rod, juice barrel, fixed inclined block, detachable juice extraction assembly (including funnel box and metal filter box), extrusion assembly (including pressing handle, rotating plate, gland) and brake assembly.When using, fruit is placed, and pressing handle drives gland to extrude juice vertically by rotating plate structure, and juice flows out after filtering.When cleaning, brake assembly is operated to quickly remove the fixing of juice extraction assembly, and funnel box and metal filter box are conveniently taken out for cleaning.This way reduces the strength needed for operation, and makes disassembly and cleaning more convenient.

The invention provides a heterocyclic spice controlled and slow-release type MOFs (Metal-Organic Frameworks) material as well as a preparation method and application thereof, and belongs to the technical field of spices and essences. The MOFs material with specific pore environment, pore diameter and pore volume is prepared by regulating and controlling the ratio of the raw materials, and the prepared MOFs material has high perfume adsorption capacity and can be slowly released at room temperature. Wherein the 300nm ZIF-67 has the best adsorption effect (1083mg / g), still has the retention rate of 62.2% after being placed at normal temperature for 20 days, and only releases 6.3% within 60 minutes at the high temperature of 80 DEG C. The MOFs material prepared by the invention has excellent adsorption and slow release effects on representative heterocyclic perfume 3-acetylpyridine.

The present invention discloses a paclitaxel nanomaterial for anti-breast cancer drug resistance and its preparation method and application, belonging to the field of nanomedicine technology. The nanomedicine for treating breast cancer disclosed by the present invention uses hyaluronic acid-modified iron metal organic framework MIL-100 (Fe) as a drug delivery carrier, loaded with paclitaxel and iFSP1, and the preparation method is simple. The paclitaxel nanomaterial for anti-breast cancer drug resistance of the present invention can improve the therapeutic effect of paclitaxel on breast cancer, and also shows good therapeutic effect on breast cancer resistant to paclitaxel.

The invention discloses an adsorption material with adjustable aperture, a preparation method, an RTO pretreatment device and an RTO pretreatment process, and belongs to the technical field of waste gas treatment, the adsorption material takes a hydrophobic porous adsorption material as a matrix, and the surface of the matrix is coated with a layer of MOFs filter membrane. Furthermore, in the adsorption material, the matrix is a hydrophobic Y molecular sieve, and the MOFs filter membrane is MILs. According to the method, the pore size of the MILs porous membrane is controlled by utilizing humidity and temperature, so that the adsorption capacity of the hydrophobic Y molecular sieve under different concentrations is controlled, a peak-reducing and thickening RTO pretreatment process is provided by utilizing the adsorption material with the adjustable pore size, and stable and safe operation of an RTO device is ensured.

The invention discloses a COF-doped mixed matrix membrane, a preparation method and application in an ECCO2R system, the mixed matrix membrane comprises a PMP hollow fiber membrane, and the PMP hollow fiber membrane is doped with a COF material and a polymer; wherein the polymer is Pebax and / or PDMS (Polydimethylsiloxane). The mixed matrix membrane can effectively improve the CO2 / O2 selective adsorption performance and enhance the CO2 removal capacity in an ECCO2R system, has good biocompatibility and blood compatibility, and has great application potential in the field of biomedicine.

The invention provides a large-length-diameter-ratio main road type sintered wick high-temperature heat pipe and a preparation method thereof, and belongs to the technical field of high-temperature heat pipes. The high-temperature heat pipe comprises a pipe shell, an end cover, a porous wick, a wire mesh trunk and a liquid metal working medium, and the porous wick, the tube shell and the wire mesh trunk are integrally sintered and molded. According to the high-temperature heat pipe, the porous wick, the pipe shell and the silk screen main road are integrally sintered and formed, the contact thermal resistance can be reduced, the porous wick has high capillary force and large heat exchange area, the silk screen main road has high permeability, the heat transfer efficiency of the high-temperature heat pipe can be remarkably improved, and the heat transfer distance of the high-temperature heat pipe can be remarkably increased. When the preparation method is adopted to prepare the large-length-diameter-ratio trunk line type sintered wick high-temperature heat pipe, the middle core rod is easy to draft, impurities such as a release agent which pollutes the wick are not introduced, the problem that the high-temperature heat pipe is difficult to draft is solved, and the preparation method can be used for standardized and batch production of the large-length-diameter-ratio trunk line type wick high-temperature heat pipe.

The invention discloses a damping type segmented hydraulic slide valve pair structure, and relates to the technical field of electro-hydraulic servo valves, damping cavities are introduced into two ends of a valve core, the movement damping of the valve core is changed by adjusting the size of a slender hole, the anti-interference capability of the valve core is improved, and meanwhile, the displacement monitoring and fault diagnosis of the valve core are realized through an embedded flowmeter. The damping type segmented hydraulic slide valve pair structure comprises a first valve element, a second valve element, a third valve element, a valve sleeve, a slender hole and an embedded flow meter.

The invention discloses a three-dimensional ordered pore diameter-adjustable iron-aluminum composite metal oxygen carrier as well as preparation and application of the three-dimensional ordered pore diameter-adjustable iron-aluminum composite metal oxygen carrier. The preparation method comprises the following steps: preparing monodisperse polystyrene microspheres by adopting an emulsion polymerization method, and forming colloidal crystal templates of the polystyrene microspheres with different pore diameters through self-assembly; and filling gaps of the polystyrene colloidal crystal template with a precursor solution prepared from an aluminum salt and an iron salt by adopting an impregnation method, and calcining to obtain the three-dimensional ordered pore diameter-adjustable iron-aluminum composite metal oxygen carrier. The three-dimensional ordered pore diameter-adjustable iron-aluminum composite metal oxygen carrier is used for a biomass chemical chain gasification process, and has good oxygen transmission capability and very strong agglomeration and caking resistance.

The application discloses a preparation method of a nano-oriented porous structure, which comprises the following steps: adding an organic solvent into a polymer material / water solution to prepare a polymer material / water / organic solvent mixed solution; performing ultrasonic treatment on the polymer material / water / organic solvent mixed solution to form a polymer material / water / organic solvent mixed solution containing nano-level microdroplets; directionally freezing the polymer material / water / organic solvent mixed solution containing nano-level microdroplets to form a block containing nano-level microdroplets; and removing the water and the organic solvent from the polymer material / water / organic solvent block in a low-temperature high-vacuum environment and crosslinking the polymer material at a low temperature to obtain the nano-oriented porous structure. The porous structure has high porosity, high flux and excellent mechanical properties.

The invention discloses a bipolar plate, a manufacturing method thereof and a fuel cell, and the manufacturing method of the bipolar plate comprises the following steps: selecting metal powder with conductive and heat-conducting properties, compounding and mixing the metal powder with a binder, a solvent and a pore-forming agent, and then carrying out high-temperature treatment to prepare a functional layer with a porous network structure; and selecting an ultra-thin metal layer, stacking the ultra-thin metal layer and the functional layer, and performing high-temperature sintering to obtain the bipolar plate. The manufacturing method of the bipolar plate is simple and reasonable, automatic, large-scale and efficient processing production can be realized, and the obtained bipolar plate has the characteristics of good heat conductivity, high electric conductivity, high mechanical strength, high air tightness, capability of meeting the two-way transmission flow requirements of uniform gas inflow, liquid outflow and non-interfering gas-liquid flow, and the like. And the use requirements of the proton exchange membrane fuel cell are well met.

This invention relates to a composite sodium-replenishing material, its preparation method, an electrode, and a battery. The composite sodium-replenishing material comprises a matrix, a sodium-replenishing agent body, and a conductive reinforcement. The matrix is ​​porous carbon fiber; the sodium-replenishing agent body is distributed on the surface and within the pores of the matrix; the conductive reinforcement is partially embedded within the sodium-replenishing agent body and partially located on its outer surface. The preparation method of the composite sodium-replenishing material includes the following steps: hydrothermal treatment of a dispersion; the dispersion comprises porous carbon fibers, sodium salt, and a conductive reinforcement. The composite sodium-replenishing material of this invention can improve the initial efficiency and capacity retention of sodium-ion batteries.

This invention discloses an asymmetric polyethersulfone ultrafiltration membrane and its preparation method, belonging to the field of membrane separation technology. The preparation method of the asymmetric polyethersulfone ultrafiltration membrane includes the following steps: 15-30 parts of polyethersulfone, 2-10 parts of polyvinylpyrrolidone, 60-80 parts of a cyclic lactam solvent, and 1-8 parts of a volatile pore-forming agent are melt-mixed at high temperature according to the specified ratio, cast into a film, cooled and solidified, extracted with hot water, and dried to obtain the asymmetric ultrafiltration membrane. This application uses a system containing a cyclic lactam solvent and a volatile pore-forming agent, resulting in a low operating temperature during the preparation process, reducing energy consumption and promoting energy conservation and environmental protection. The obtained ultrafiltration membrane has an asymmetric structure, with a dense skin layer on the surface and a continuous sponge-like porous structure in the internal support layer. It has no macropores or finger pores and possesses high filtration accuracy and high flux, making it applicable to ultrafiltration, macromolecule retention, water treatment, and other fields.