287 results about "Mixed matrix" patented technology

The invention discloses a high-solid-content MIL-101 (Fe) / PIM-1 mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The preparation method comprises the following steps: firstly, dissolving an iron source in a PIM-1 polymer solution to form a homogeneous membrane casting solution; forming the obtained membrane casting solution, and removing the solvent to obtain a PIM-1 / Fe (II) composite substrate containing Fe (III); then, the substrate is alternately immersed in a terephthalic acid methanol solution and a ferric salt methanol solution, and MIL-101 (Fe) is generated in the polymer matrix through in-situ limited crystallization by layer-by-layer limited crystallization. According to the method, the problem of interfacial compatibility between the MOF filler and the polymer matrix is effectively solved, and high loading capacity (up to 52.9 wt.%) of MIL-101 (Fe) is realized without agglomeration. Meanwhile, the membrane has excellent COplasticizing resistance and long-term operation stability, and has a wide application prospect in the fields of carbon capture and the like.

The invention relates to the technical field of membrane separation materials, in particular to a mixed matrix membrane and a preparation method and application thereof. The mixed matrix membrane comprises: (1) a polymer functional membrane; (2) a base film for supporting the polymer functional film; a polymer in the polymer functional film comprises a polymer with a structure as shown in a formula (a), in the formula (a), R0 is an alkylene chain, R1 is a polysiloxane group, R2 is alkyl or hydrogen, and m is equal to 1-20. According to the present invention, the functional membrane prepared from the polymer having the structure (a) is used, and the structure of the polysiloxane is designed and optimized, such that the mixed matrix membrane has excellent organic solvent tolerance and organic solvent pervaporation separation property, and the interfacial compatibility between the polymer and the porous filler can be improved.

The invention discloses a mixed matrix membrane for efficient oxygen and nitrogen separation and a preparation method and application thereof. The mixed matrix membrane comprises a polymer continuous phase and an MOF filler uniformly dispersed in the polymer continuous phase, the MOF filler can separate nitrogen and oxygen, and the surface of the MOF filler is modified by the silane coupling agent, so that the MOF filler is well compatible with a polymer, and the oxygen-nitrogen separation effect is improved. The polymer solution and the MOF filler dispersion liquid are mixed, the mixed matrix membrane is prepared through the non-solvent induced phase separation method, and the method has the advantages of being simple in reaction condition, high in efficiency, easy to amplify and the like and has wide engineering prospects.

The invention discloses a gas separation mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas membrane separation. The mixed matrix membrane comprises a high polymer material matrix and a porous material, and through hydrogen-bond interaction formed by the high polymer material matrix and the porous material, the interfacial compatibility between a filler and the polymer matrix and the dispersity of the filler are remarkably enhanced; the pore material is used as a pore structure regulator, improves the chain accumulation mode of a polymer matrix and provides a selective gas separation window, and the gas screening capacity of the membrane is remarkably improved through the synergistic effect of the pore material and the pore structure regulator. The mixed matrix membrane is prepared by adopting a solution pouring method, the process is simple, the repeatability is high, large-area preparation is easy, the cost is low, the method is suitable for the fields of helium separation, hydrogen purification, natural gas purification, biogas purification and carbon capture, and the application prospect is wide.

The invention discloses a method for preparing a mixed matrix proton exchange membrane with an ultrahigh filler ratio through electrostatic spraying. Preliminary dispersion of filler in membrane liquid is achieved through wet ball milling, the membrane liquid is stretched into nanoscale charged liquid drops at a spray head through the electrostatic field effect, the liquid drops achieve uniform dispersion of the filler in the space due to the charge repulsion effect, filler agglomeration can be avoided, and interface fusion can be enhanced; in the electrostatic spraying process, liquid drops fall on a roller shaft under the action of an electric field and are overlapped and fused into a film, so that the mechanical strength of the mixed matrix film can be effectively improved; the nanoscale liquid drops are overlapped on the roller and dried and volatilized to block holes, and the compact mixed matrix proton exchange membrane can be prepared in one step through in-situ densification. The compact mixed matrix membrane with ultrahigh filler loading capacity can be prepared in one step, the problems that an existing mixed matrix proton exchange membrane is low in filler ratio, poor in organic-inorganic compatibility, poor in mixed matrix membrane mechanical strength and the like are solved, the loading capacity of the filler in the membrane is greatly improved, and the preparation method is simple and easy for large-scale continuous production.

The application provides a mixed matrix membrane for efficient ion separation and a preparation method thereof, and belongs to the technical field of separation membranes.The application mixes an aluminum salt and sodium hydroxide in an organic solvent, then adds a heterocyclic organic ligand containing nitrogen to obtain a MOF precursor solution; adds polyimide into the MOF precursor solution to obtain a casting solution; pours the casting solution into a mold and performs vacuum heating, then performs peeling, soaks in ethanol, and then performs drying to obtain the mixed matrix membrane for efficient ion separation.The application realizes uniform dispersion of MOF-303 in the whole matrix by controlling the MOF loading, and constructs continuous ion channels by the uniformly dispersed MOF-303 crystal structure, so that the selectivity of the membrane to monovalent ions is further improved.The operation is simple, and the cost is low.

A MEMS gas sensor and a preparation method therefor, comprising an insulating substrate (1), a heating electrode (403), an insulating layer (105) and a testing unit, which are overlappingly disposed. The testing unit comprises a testing electrode, a sensing unit (2), and a selective separation membrane (3); the sensing unit (2) has a nanowire array structure formed by multiple nanowires disposed at intervals, and the selective separation membrane (3) covers the surface of the sensing unit and a recessed portion; the nanowires comprise a first metal and a second metal, the first metal being Pd, and the second metal being at least one selected from Ni, Cu, Ag, Au and Ir; the selective separation membrane (3) comprises an inner separation membrane (301) and an outer separation membrane (302) which are stacked in sequence; the inner separation membrane (301) comprises polytetrafluoroethylene, and the outer separation membrane (302) is a mixed matrix membrane having a covalent organic framework material as a filler and a polymer of intrinsic microporosity as a matrix. The MEMS gas sensor possesses excellent sensitivity for low-concentration gas monitoring, and tolerance stability for high-concentration gas, as well as excellent anti-interference performance and response speed.

The application relates to the technical field of film materials, in particular to a mixed matrix membrane and a preparation method and application thereof. Toluene is added into a viscous polyamine acid solution, the temperature is increased to 200-250 DEG C, and stirring reaction is carried out for 5-8 hours, then the precipitate is obtained through centrifugation, the precipitate is washed with methanol for 3-5 times, and the product COOH-PI is obtained through drying; zinc nitrate hexahydrate and 2-methyl imidazole are dissolved in methanol, stirring reaction is carried out at room temperature for 3-8 hours, then the product is taken out and centrifuged, the product is washed with anhydrous methanol for 3-5 times, and ZIF-8 is obtained through drying; NH2-ZIF-8 is synthesized by using the same method; COOH-PI is added into DMF and stirred to obtain a PI solution, ZIF-8 and NH2-ZIF-8 are respectively added into DMF, and MOF suspension is obtained through ultrasonic treatment for 2-5 hours, then the MOF suspension is added into the PI solution, stirring is carried out at room temperature for 24-36 hours, the casting solution obtained is poured into a flat and clean glass plate, heating is carried out at 60-65 DEG C for 24-48 hours, then the formed membrane is dried to obtain the mixed matrix membrane. The preparation condition of the mixed matrix membrane is mild, the stability of the membrane is obviously improved, and the mixed matrix membrane has high selective permeability to helium.

The invention discloses a preparation method of a negative electricity microenvironment MOF (Metal Organic Framework) carbon capture material, the carbon capture material takes a Cu-AD-xF material with a negative electricity microenvironment as a filler and polyether block polyamide Pebax as a polymer matrix, and the carbon capture material is formed by physically blending the filler and the polymer matrix at normal temperature. The invention also discloses the negative electricity microenvironment MOF carbon capture material prepared by the preparation method and application thereof. The negative electricity microenvironment MOF carbon capture material can realize selective recognition of CO2 in a mixed matrix membrane, so that CO2 / CH4 mixed gas is effectively separated.

The invention discloses a mixed matrix membrane based on defect MOF and a preparation method and application thereof, and the method comprises the following steps: (1) dissolving a hydroxyl-containing monodentate carboxyl organic ligand and 2-aminoterephthalic acid in a solvent A, stirring at room temperature, and carrying out ultrasonic treatment to obtain a mixed solution; then dropwise adding tetraisopropyl titanate into the mixed solution, and carrying out heating reaction in a reaction kettle; after the reaction is finished and cooling is carried out, a solid product is collected through centrifugation, washed and dried, and DN-MIL-125 is obtained; (2) dispersing DN-MIL-125 in a solvent B to obtain a DN-MIL-125 suspension, dissolving an intrinsic microporous polymer cPIM-1 in a solvent C to obtain a cPIM-1 solution, and then uniformly mixing the cPIM-1 solution with the DN-MIL-125 suspension to obtain a membrane casting solution; and carrying out defoaming treatment on the membrane casting solution, and forming a membrane by adopting a solution casting method to obtain the mixed matrix membrane DN-MIL-125 / cPIM-1. According to the method, the defective metal organic framework material DN-MIL-125 is added into the cPIM-1 intrinsic microporous polymer to prepare the mixed matrix membrane, and the separation performance of CO2 / N2 gas can be remarkably improved.

The invention discloses an interface in-situ assembled gel and nanoparticle composite polyether sulfone membrane as well as preparation and application thereof, and belongs to the technical field of nano material and membrane separation. According to the invention, a gel and nanoparticle composite structure is constructed in situ on the surface of the membrane and in pores through a phase separation strategy for the first time, a gel layer of a main body is formed by crosslinking polyphenol and zirconium oxychloride, and nanoparticles are formed by complexing unoccupied sites of polyethyleneimine and polyphenol; a nucleation site is provided for in-situ construction of the gel layer on the surface. Compared with a surface modification post-treatment method, the method disclosed by the invention has the advantages of process integration, coating stability and the like; compared with a mixed matrix membrane constructed by zeolite and carbon nanotubes, agglomeration and polymer embedding are avoided, and a coating constructed by mixing hydrophilic gel and nanospheres can be formed on the surface of the polymer.

The present application relates to the technical field of surface treatment, in particular to a kind of biobased degradable cable material and preparation method thereof.Biobased degradable cable material includes 55-65 parts of poly-L-lactic acid and poly-3-hydroxybutyric acid-3-hydroxyhexanoate mixed matrix resin, 4-6 parts of dianhydride modified castor oil polyol, 10-15 parts of polyaminoval, 5-8 parts of nano enhanced filler, 6-10 parts of biobased plasticizer, 0.5-1.0 parts of antioxidant, 8-12 parts of environmentally friendly flame retardant.Dynamic ester bond crosslinking agent dianhydride modified castor oil polyol reaction forms dynamic ester bond crosslinking network, ester bond breakage occurs at high temperature beyond normal working range to release stress, temperature returns to normal and can recombine again;Semi-interpenetrating network enhanced phase polyaminoval forms interpenetrating structure with matrix resin in molecular chain interlacing mode, constructs stable heat-resistant skeleton, effectively inhibits high-temperature deformation, and its biobased structure ensures the overall degradability of the material, realizes the balance of heat resistance and degradability.

The invention relates to a membrane material, in particular to a mixed matrix membrane with high filler loading capacity and a preparation method thereof. According to the invention, the MOF particle modification layer polymer and the film-forming polymer both adopt PIM-1, so that the interface energy is reduced, and the compatibility between the filler and the film layer is improved, thereby greatly increasing the filler loading capacity in the film-forming polymer.

This invention relates to the field of gas separation membrane material preparation, and discloses a CO2 separation mixed matrix composite membrane and its preparation method. The method includes: mixing an amino-containing MOF, a bridging ligand, a first solvent, and an optional first catalyst and carrying out a first reaction; separating a solid product from the first reaction product to obtain a pre-modified solid; mixing the pre-modified solid, a portion of an amino polymer, a second solvent, and an optional second catalyst and carrying out a second reaction; separating a solid product from the second reaction product to obtain a modified MOF; mixing the modified MOF with water to obtain a mixture; then mixing the mixture with another portion of an amino polymer and coating it onto a polysulfone ultrafiltration membrane containing a silicone rubber interlayer. The CO2 separation mixed matrix membrane exhibits significant wetting between particles and the amino polymer, without generating interfacial defects, and has a high MOF loading, resulting in excellent carbon dioxide separation performance.

The application discloses a preparation method of a Zr-based metal-organic framework-based mixed matrix membrane, and relates to the field of gas separation membranes.The mixed matrix membrane is prepared by taking a defect-exchanged Zr-based metal-organic framework material as a filler and polyimide 6FDA-DAM as a polymer matrix.The application overcomes the defects of the prior art, and o-TBA-U iO is prepared by dispersing a defect state U iO-66 in an N,N-dimethylformamide solution of o-TBA (o-Tri-fluoromethyl benzoic acid) and then performing a heating reaction, followed by centrifugation, washing and drying in sequence.Then, the o-TBA-U iO is mixed with 6FDA-DAM in a chloroform solution, and a mixed matrix membrane is prepared by a solvent evaporation method.The application has the advantages and benefits that the MOF-based mixed matrix gas separation membrane has good C3H6 permeability and ultrahigh C3H6 / C3H8 ideal selectivity, and the main reason is that the introduction of o-Tri-fluoromethyl benzoic acid enhances the molecular sieving ability of the membrane for C3H6 / C3H8 and the preferential diffusion rate of C3H6.

The invention discloses an ethanolamine modified KMnF3at-Zn-MOF-74 mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. According to the method, KMnF3 nanoparticles serve as a core, Zn-MOF-74 grows on the surface of the KMnF3 nanoparticles in situ, and KMnF3-coated Zn-MOF-74 of a core-shell structure is obtained. Then, ethanolamine is used for carrying out amination modification on the Zn-MOF-74, so that-OH and-NH2 in the ethanolamine are subjected to coordination or hydrogen bond interaction with open metal sites of the Zn-MOF-74, and the polarity of the filler and the interfacial compatibility with Pebax-1657 are remarkably improved. The modified KMnF3 (at) Zn-MOF-74 is uniformly dispersed in a Pebax-1657 polymer matrix, so that the Pebax-1657 mixed matrix membrane of the ethanolamine modified KMnF3 (at) Zn-MOF-74 is prepared, and the selectivity and the permeability of a CO2 / N2 system are remarkably improved. The preparation process is mild, simple and convenient, the controllability is high, and the obtained membrane is stable in structure and excellent in performance and can be widely applied to the field of CO2 capture and separation.

The invention discloses a nanofluid mixed matrix membrane as well as a preparation method and application thereof, and belongs to the field of gas separation. The nanofluid mixed matrix membrane comprises a polymer matrix and a nanofluid filler, the nanofluid filler is of a three-dimensional layered structure, a core layer is a porous material layer, a secondary outer layer is a coupling agent connecting layer, and an outermost layer is an organic matter coronal layer containing a CO2-philic group. The coronal layer improves the compatibility of the porous material and the polymer matrix and increases the CO2 affinity of the mixed matrix membrane, not only increases the diffusivity of the mixed matrix membrane, but also increases the CO2 solubility, and due to the unique connection mode between the porous core and the coronal layer, the thermal stability of the porous core and the coronal layer is also enhanced. Therefore, the prepared novel efficient mixed matrix membrane has good gas separation performance and thermal stability and is especially suitable for CO2 separation, and CO2 / H2 of the product breaks through the Robeson upper limit in 2008.

This invention discloses a two-dimensional MUF-16 nanosheet, a hybrid matrix membrane, its preparation method, and its application in separation. The two-dimensional MUF-16 nanosheet has a lateral dimension of 500-900 nm and a thickness of 100-300 nm, possessing a 0.76 nm one-dimensional microporous network, with 2-3 nm textured mesopores derived from lamellar misalignment. Addressing the problem of intra-membrane aggregation and interface defects caused by the large crystal size of conventional MUF-16, this invention introduces a monocarboxylic acid modifier as a morphology modifier, combined with a cobalt metal source, to precisely block the growth of specific crystal faces through steric hindrance, successfully preparing the two-dimensional MUF-16 nanosheet. Furthermore, it is dispersed as a filler in a Pebax-2533 polymer matrix, and a high-performance hybrid matrix membrane is constructed through spin-coating. Its CO2 permeability coefficient reaches 511.47 Barrer, and its CO2 / N2 separation factor reaches 37.82. This hybrid matrix membrane exhibits excellent resistance to plasticization and long-term service stability, and has broad commercial application prospects in fields such as industrial flue gas decarbonization, natural gas purification, and biogas upgrading.

The application relates to a preparation method and application of a silicone / MOF-303 mixed matrix membrane. A silicon source precursor is uniformly dissolved in an ethanol solvent, a mixture of water and hydrochloric acid is added in a certain proportion, water bath heating is carried out for a period of time, and a silicone sol is obtained. MOF-303 powder prepared in advance is added into the silicone sol in a certain proportion, ultrasonic mixing is carried out to obtain a separation layer sol, the prepared separation layer sol is coated on a ceramic support through a hot coating method, and calcination is carried out in an air atmosphere for a period of time to obtain a MOF-303 / mixed matrix membrane. The application preferably uses an organic silicone substance BTESA with a rigid acetylene bridge structure as a precursor, and the MOF-303 material with a high specific surface area is doped into the precursor, the pore structure of the membrane is modified, and more adsorption sites are provided for water molecules. Through optimization of the composite proportion, a composite membrane material with the best separation performance is obtained.

The invention provides a CD (at) HZ composite material with electrostatic gating, a preparation method of the CD (at) HZ composite material and application of the CD (at) HZ composite material in carbon capture, and belongs to the technical field of composite material preparation, mixed matrix membrane material preparation and carbon capture. The preparation method comprises the following steps: compounding CD and HZ to obtain a CD-coated HZ composite material with electrostatic gating, and physically blending the CD-coated HZ composite material serving as a filling agent with a Pebax matrix to form a mixed matrix membrane; in the mixed matrix membrane, CD selectively recognizes CO2 and CH4 through electrostatic interaction force, HZ provides a rapid CO2 transfer channel, and the mixed matrix membrane has excellent selectivity on CO2 / CH4, can efficiently separate CO2 / CH4 and has good application in carbon capture.

The invention belongs to the technical field of gas separation membranes, and relates to a mixed matrix membrane based on a preformed covalent organic framework network, and a preparation method and application thereof. The mixed matrix membrane comprises a COF network, a polyimide polymer and a self-supported flexible substrate, and the mixed matrix membrane is MATT-COFTD-x; the polymer is polyimide Matrimid5218, and the 3D interconnection COF network is a COFTD (Chip On Fiber Transfer Device) network; the COF network is prepared by reacting an aldehyde monomer and an amino monomer on the surface of the SiO2 / Si substrate through a liquid-solid interfacial polymerization method. According to the prepared mixed matrix membrane, filler agglomeration is eliminated, a continuous 3D interconnected COF network is provided, ultra-fast gas transmission is allowed, high permeability and high selectivity are achieved, and meanwhile stable high performance is still kept under the conditions of high pressure, different H2 / CH4 mixing ratios and the like.

The application relates to a preparation method of a polyvinylamine modified Schiff base framework material for preparing a high-performance carbon dioxide separation mixed matrix membrane; a polyvinylamine aqueous solution is poured into acetone to obtain polyvinylamine precipitation without new white precipitate being generated, and white polyvinylamine solid is obtained after drying; the solid is dissolved in ethanol to obtain a polyvinylamine ethanol solution; the polyvinylamine ethanol solution and a Schiff base framework are mixed, zeolite molecular sieves are added, and stirring reaction is carried out at 70-80 DEG C for 2-8 h; after centrifugation, the precipitate is washed with deionized water and anhydrous ethanol, and the precipitate is placed in a vacuum drying box for heating and drying until the solvent is removed, so that the polyvinylamine modified Schiff base framework material is obtained. Compared with a pure PVAm membrane, the CO2 permeation rate is increased by 292%-425%, and the CO2 / N2 separation factor is increased by 233%-294%. The polyvinylamine modified Schiff base framework material has a strong application prospect.

The invention discloses a novel styrene-acrylonitrile neutron / gamma discrimination plastic scintillator and a preparation method and application thereof. The plastic scintillator is composed of a mixed matrix, a main fluorescent dye and a secondary fluorescent dye, the mixed matrix is styrene-acrylonitrile (ABN), the main fluorescent dye is 2, 5-diphenyl oxazole (PPO), and the secondary fluorescent dye is 9, 10-diphenyl anthracene (DPA). The prepared plastic scintillator uses the mixed matrix, the traditional scintillator usually focuses on the influence of the matching of primary and secondary fluorescent dyes on the plastic scintillator, which is only in the transfer direction of debugging matrix excitation energy, and the innovation of the double mixed matrix can explore another way and expand thinking for researching how to improve the light yield of the plastic scintillator. Meanwhile, the addition of acrylonitrile improves the transparency and hardness of the plastic scintillator, and the stability is also greatly improved.

The application belongs to the technical field of matrix resin fluid heating, and discloses a mixed matrix resin heating device and a construction method, which comprise a heating mechanism and a temperature control mechanism, and the glue injection end cover assembly, the glue outlet end cover assembly and the glue storage cylinder are detachably and sealingly connected, so that the airtightness in the working process can be ensured, and subsequent maintenance and cleaning are facilitated, and the structure is simple. The temperature measuring element in the temperature control mechanism is arranged on the heating element, the input end of the temperature measuring element is electrically connected with the heating element, the surface temperature of the heating element can be monitored in real time, the output end of the temperature measuring element is electrically connected with the intelligent temperature control assembly, the intelligent temperature control assembly is also electrically connected with the heating element, so that closed-loop control of the heating state is realized, the working temperature of the heating element is kept in the preset range, and it is ensured that the matrix resin is always in the best flow state of high flowability and low viscosity. The structure can be designed to be small in size, occupies small space, is helpful to improve the heat energy utilization rate and reduce energy consumption.

The invention discloses a high-purity disilane production system and a high-purity disilane production method. The system comprises a reactor (100), a primary gas-solid separator (200), supercharging equipment (300), a secondary gas-solid separator (400), a gas separation membrane assembly (500), a light component removal tower (600) and a product tower (700) which are sequentially connected through pipelines. The core of the invention lies in that a two-stage gas-solid separation structure is adopted to effectively solve the contradiction between the low-pressure operation of the reactor and the high-pressure feeding of the membrane module, and core equipment is fully protected; meanwhile, a mixed matrix molecular sieve membrane is arranged in the gas separation membrane assembly, and screening of hydrogen and monosilane molecules can be efficiently achieved, so that the reaction byproduct hydrogen is removed through a one-step method. According to the method, monosilane is taken as a raw material, after reaction synthesis, primary dust removal, pressurization, fine dust removal, membrane-method dehydrogenation and rectification separation are sequentially carried out on a product, a high-purity disilane product is finally obtained, and unreacted monosilane is returned to a system for cyclic utilization.

The present application relates to the geological exploration technical field, more particularly, to a deep water super shallow layer natural gas reservoir rock physics shear wave velocity prediction method, comprising: calculating equivalent bulk modulus, shear modulus and density of a plurality of mineral mixed matrix according to shale content; then calculating skeleton bulk modulus and shear modulus; then calculating saturated rock bulk modulus and shear modulus through a model, and calculating saturated rock density through rock matrix density; distributing longitudinal and transverse velocities of suspended state and bearing state, and calculating equivalent longitudinal and transverse wave velocities; using equivalent longitudinal wave velocity to construct an inversion objective function with longitudinal wave velocity as a known condition; comparing actual longitudinal wave velocity with calculated longitudinal wave velocity; realizing nonlinear inversion of transverse wave velocity according to an algorithm, and obtaining transverse wave velocity of a to-be-inverted work area. The present application simultaneously considers rock physics models of particle suspended state and bearing state, and realizes transverse wave velocity prediction and deep water super shallow layer natural gas reservoir transverse wave velocity direct inversion.

The invention belongs to the technical field of gas separation membranes, and discloses a mixed matrix membrane based on an ultramicroporous amino-functionalized covalent organic framework and a preparation method and application of the mixed matrix membrane, and the preparation method comprises the following steps: dissolving a covalent organic framework material Py-COF and a pore splitting agent in a mixed solution of n-butyl alcohol, acetic acid and water; after ultrasonic treatment, stirring while heating to obtain an ultra-microporous amino-functionalized covalent organic framework; and blending the ultramicroporous amino-functionalized covalent organic framework with a polyether-polyamide block copolymer solution, transferring the mixture to a substrate, and drying the mixture. According to the invention, a pore segmentation strategy is used for pore structure regulation and functionalization of the two-dimensional COF, and accurate shrinkage of the pore diameter of the Py-COF from micropores to ultramicropores and in-situ modification of NH2 functional groups of pore walls are synchronously realized through the Py-COF and the pore segmentation agent, so that the mixed matrix membrane has high permeability, high selectivity and excellent stability, and is especially suitable for efficient capture and separation of CO2.

The application relates to a kind of incremental time-varying structure operating modal parameter real-time identification method and system. By determining the modal shape matrix and modal response matrix at initial time i-1 according to multi-channel vibration response data and the time length of sliding window, it is judged whether the sum of current time i and the time length L of sliding window is less than or equal to the end time of sliding window. If yes, the modal coordinate response matrix at initial time i-1 is substituted into the calculation of the sliding window at the i-th time, and the incremental independent component analysis algorithm is used to determine the mixing matrix and source signal at the i-th time. According to the mixing matrix and source signal, the modal shape matrix and modal response matrix corresponding to the i-th time are determined, and the modal shape matrix and modal response matrix at the i+1-th time, the i+2-th time,..., the i+L-th time are determined in turn. The application can reduce the time of identifying time-varying structure operating modal parameters and improve the accuracy of the identification result.

The invention discloses a preparation method of a ZIF-67 / PDMS mixed matrix pervaporation membrane, which comprises the following steps: dissolving 2-methylimidazole and docusate sodium in methanol to obtain a 2-methylimidazole solution; the preparation method comprises the following steps: uniformly mixing a methanol solution of cobalt nitrate hexahydrate and a 2-methylimidazole solution, standing to obtain a ZIF-67 precursor suspension, carrying out solid-liquid separation to obtain ZIF-67 crystals, uniformly dispersing the ZIF-67 crystals in ethanol, adding polydimethylsiloxane into the ZIF-67 crystals, uniformly dispersing the ZIF-67 crystals to obtain a suspension, adding a cross-linking agent and a catalyst into the suspension, uniformly stirring to obtain a ZIF-67 / PDMS coating solution, and carrying out vacuum drying on the ZIF-67 / PDMS coating solution. And uniformly coating the surface of a PVDF substrate membrane with the obtained product, crosslinking at normal temperature, and drying to obtain the product. Compared with a pure PDMS pervaporation membrane, the ZIF-67 / PDMS mixed matrix membrane has the advantages that the separation factor of the ZIF-67 / PDMS mixed matrix membrane on a linalool and water mixed system is obviously improved, and the membrane flux is up to 600-700 mgm <-2 > h <-1 >. The method is applied to a pervaporation technology to separate aromatic substances in food, and after a to-be-intercepted side solution is subjected to series processing to form a product, a permeation side solution rich in the aromatic substances is backfilled into the product, so that the aroma of the product is repaired.