705 results about "Interfacial polymerization" patented technology

The invention provides a polyimide multilayer composite membrane material as well as a preparation method and application thereof, and belongs to the technical field of gas separation. According to the method, through collaborative design of a functional support layer, a gradient MOF layer and an ultrathin selection layer structure, the problems of support layer pore seepage, MOF agglomeration, weak interface bonding and the like in an existing composite membrane material are solved. The preparation method comprises the following steps: firstly, carrying out electrostatic spinning on a polyamide acid glue solution, and synchronously introducing dopamine by adopting a chemical imidization method to prepare a functionalized polyimide fiber membrane containing hydroxyl and amino on the surface, so that the mechanical property of a supporting layer and the MOF anchoring capability are remarkably improved; growing MOF layers with different particle sizes on the surface of the fiber membrane by regulating and controlling the concentration gradient of ligand / metal salt and the reaction time, and passivating through a silane coupling agent after each step of growth so as to avoid heterogeneous nucleation and construct a gradient structure; after the MOF gradient layer is subjected to Ar plasma pretreatment to introduce hydroxyl, the ultrathin polyamide selection layer is formed by utilizing interfacial polymerization of fluorine-containing acyl chloride and a macrocyclic amine monomer, and the ultrathin polyamide selection layer is suitable for gas separation work.

This disclosure relates to the fabrication of high-performance thin film composite (TFC) reverse osmosis (RO) membranes comprising a thin polyamide rejection layer (thickness of 100-200 nanometer), a porous substrate including polysulfone (PSf) layer (thickness of 40-50 micron) cast on polyester nonwoven fabric (thickness of ˜100 micron). Hydrophilic and antibacterial TFC polyamide RO membranes were developed by incorporating green Lignin and nanostructured silver-based metal organic frameworks (MOFs) into the selective layer. The polyamide layer of TFC RO membranes was fabricated on the porous PSf substrate by interfacial polymerization between aqueous monomer solutions containing MPD, and adequate additives in water and organic monomer solutions containing TMC in the mixture of hexane and co-solvents. The optimized produced RO membranes were provided water flux of 95-100 LMH and sodium chloride (NaCl) salt rejection of 98.5-99.0% during filtration of 2000 ppm NaCl solution at 225 psi pressure, and water flux of 55-60 LMH and sodium chloride (NaCl) salt rejection of 98.6-98.9% during filtration of 35000 ppm NaCl solution at 800 psi pressure. This disclosure also relates to developing a roll-to-roll PSf membrane as a substrate for making TFC RO membranes for water desalination

A method of preparing a polyamide membrane with multi-level pore structure mediated by protein fiber network includes the steps of: preparing protein fiber; quenching and carrying out dialysis; loading protein fiber network on ultrafiltration membrane; preparing aqueous and organic phase solutions; and carrying out interfacial polymerization, which can solve the problems of the integrity and separation performance of the polyamide layer being affected by low porosity of the base membrane and uneven distribution of amine monomers. The polyamide membrane prepared by the method of the present invention greatly improves the water flux while ensuring a high salt rejection rate. At the same time, the introduction of the protein fiber network also enhances the mechanical strength and anti-pollution ability of the membrane.

Membranes and related systems and methods for separation of components in liquids are generally described. The membrane may include particles in a polymer matrix (e.g., a polyamide layer). The particles may include metal-organic framework particles comprising functional groups (e.g., from post-synthetic modification) that can, in some instances, improve the rejection and / or selectivity of the membrane. For example, the metal-organic framework may comprise functional groups bound to hydrophobic groups (e.g., alkyl chains) that assist with suspension stability in nonpolar solvents during membrane fabrication. As another example, the metal-organic framework may comprise functional groups bound to crosslinking agents that facilitate in situ crosslinking of the particles with the polymer matrix, thereby reducing voids in the membrane and / or leaching. In some instances, the membrane is a thin-film nanocomposite membrane (e.g., for separating components like charged species and / or neutral species) formed via, for example, interfacial polymerization in the presence of the particles.

The invention relates to a super-flexible supercapacitor with a multi-layer seamless interlocking interface and a preparation method of the super-flexible supercapacitor. The super-flexible supercapacitor takes a carbon nanotube or a composite film thereof as an electrode; and polyanion gel (polyacrylamide / polyacrylic acid / poly (3-sulfonic acid propyl methyl acrylic acid potassium salt) and polycation gel (polyacrylamide / polyacrylic acid / poly (methacryloyloxyethyl trimethyl ammonium chloride) are used as the double-layer heterogeneous electrolyte. A covalent connection electrode / electrolyte interface is constructed through anchoring interface polymerization, and double-layer gel electrolyte with electrostatic attraction and mutual entanglement is constructed through in-situ polymerization, so that the super-flexible supercapacitor with a multi-layer seamless interlocking interface is realized. Compared with the prior art, the super capacitor has super-strong interface toughness and interface adhesion, can resist mechanical deformation including bending, folding, twisting, winding, extruding, knotting and the like, the capacity retention ratio is greater than 95% after the super capacitor is folded for hundreds of thousands of times, and the capacity retention ratio is greater than 89% after the super capacitor is circularly charged and discharged for hundreds of thousands of times.

The invention relates to a bionic strong acid-resistant nanofiltration membrane and a preparation method thereof, and the bionic strong acid-resistant nanofiltration membrane comprises a porous support layer and an active separation layer formed on the surface of the porous support layer, the active separation layer is a polymer network layer formed by carrying out interfacial polymerization reaction on a water-phase solution containing polyamine and an oil-phase solution containing polyacyl chloride on the surface of the porous support layer. The water-phase solution and / or the oil-phase solution also contains a bionic amphiphilic phosphate compound, the bionic amphiphilic phosphate compound participates in interfacial polymerization reaction through an active functional group in a molecular structure of the bionic amphiphilic phosphate compound, and the phosphate structure of the bionic amphiphilic phosphate compound is covalently connected into a skeleton of the polymer network layer. The preparation method has the beneficial effects that the bionic amphiphilic phosphate compound with a hydrophilic phosphate head, a hydrophobic alkyl tail and a reaction site is synthesized, so that the bionic amphiphilic phosphate compound is spontaneously and orderly arranged on a water / oil interface and participates in interfacial polymerization, the film forming uniformity is improved, the pore size distribution is narrowed, and the intelligent response characteristic is given to the film.

The invention discloses a method for improving water flux and anti-pollution capacity of a polyamide reverse osmosis membrane and application of the method, and belongs to the technical field of water treatment membranes.The method comprises the steps that a water-phase solution containing polyamine monomers and an oil-phase solution containing polyacyl chloride monomers are respectively subjected to droplet formation into a water-phase solution containing polyamine monomers and an oil-phase solution containing polyacyl chloride monomers through a droplet generator, and the water-phase solution containing polyamine monomers and the oil-phase solution containing polyacyl chloride monomers have the particle size of 10-200 microns; water phase solution droplets and oil phase solution droplets with the specific surface area of 3 * 10 < 4 >-6 * 10 < 5 > m < 2 > / m < 3 > are sequentially sprayed on the ultrafiltration substrate membrane through a moving spray head system, so that the water phase solution droplets and the oil phase solution droplets are fully contacted to generate an interfacial polymerization reaction, and after the spraying process is finished, heat treatment is performed to obtain the polyamide reverse osmosis membrane. According to the method disclosed by the invention, the traditional interfacial polymerization method is improved, a new additive is not introduced, and the water flux and the anti-pollution capacity of the polyamide reverse osmosis membrane are further improved on the basis of reducing the solvent dosage.

The invention belongs to the technical field of membrane separation, and particularly relates to a method for preparing a high-flux hollow fiber nanofiltration membrane based on interfacial polymerization, the obtained membrane and application. The method comprises the following steps: firstly, carrying out pre-adsorption treatment on a polyethersulfone hollow fiber ultrafiltration base membrane through a polyethyleneimine aqueous solution to form a reactive anchoring layer; then sequentially dipping in an aqueous phase solution containing piperazine, sodium phytate and nanoscale cellulose whiskers and an organic phase solution containing trimesoyl chloride and 5-isocyanate isopeptide acyl chloride for interfacial polymerization; and finally, carrying out heat treatment on the obtained primary composite membrane, and completing a gas-phase cross-linking reaction in a glutaraldehyde steam atmosphere. According to the method, the hollow fiber nanofiltration membrane with high flux, high selectivity, excellent chlorine resistance and pollution resistance is successfully prepared through a multi-stage strengthening process, and the hollow fiber nanofiltration membrane is suitable for the fields of drinking water purification, industrial wastewater reuse, material separation and the like.

The invention belongs to the technical field of membrane separation, and particularly relates to a low-pressure high-flux polyamide / polysulfone hollow fiber composite nanofiltration membrane and a preparation method thereof. The preparation method of the composite nanofiltration membrane comprises the following steps: dissolving sulfonated polysulfone, poly (1-vinyl-3-butylimidazole) bromide and polyvinylpyrrolidone to prepare a spinning solution, and spinning to obtain a base membrane; carrying out hydrophilic modification on the base membrane by using 1, 3-propane sultone; then, an aqueous phase solution containing poly (gamma-glutamic acid) and triethylene tetramine and an organic phase solution containing trimesoyl chloride and 3, 5-diaminobenzoic acid are subjected to interfacial polymerization in the inner cavity of the modified base membrane to form a polyamide separation layer; and finally, carrying out heat treatment to obtain the composite nanofiltration membrane. Through the synergistic effect of zwitterionic ionization of the base membrane and biomacromolecule construction of the separation layer, the mass transfer resistance of water is remarkably reduced, unification of high flux and high selectivity is achieved, and good structural stability is achieved.

The invention belongs to the field of membrane separation, and provides a conductive nanofiltration membrane, a roll type conductive membrane filter element and a nanofiltration separation method.The conductive nanofiltration membrane comprises a substrate layer, a conductive layer and a separation layer and is prepared through a two-step vacuum filtration process and a vacuum filtration assisted in-situ interfacial polymerization method; meanwhile, good conductivity and selective separation capability are realized. In addition, the invention also provides a roll-type conductive membrane filter element based on the conductive nanofiltration membrane, and the roll-type conductive membrane filter element comprises the conductive nanofiltration membrane, a central conduit with a plurality of side holes, a water production diversion separation net, a water inlet diversion separation net, a counter electrode conductive layer, a conductive connector lug and a metal sheet (used for power connection), the roll type conductive membrane filter element can dynamically regulate and enhance the separation performance of charged molecules, ions and the like under the action of an electric field, and has the characteristics of simple structure, easiness in operation and amplification and adjustable and controllable membrane performance.

The invention discloses a hollow fiber nanofiltration membrane based on interfacial polymerization regulation and a preparation method thereof. The method comprises the following steps: preparing a water phase system and an oil phase system, and sequentially injecting the water phase system and the oil phase system into a hollow fiber ultrafiltration membrane; performing interfacial polymerization reaction on the water phase system and the oil phase system on the surface of the hollow fiber ultrafiltration membrane; and drying to obtain the hollow fiber nanofiltration membrane. By adopting the method, the interception performance and flux of the nanofiltration membrane can be effectively adjusted, and the stability and applicability of the nanofiltration membrane are improved. The nanofiltration membrane is low in water contact angle and high in oil contact angle. Particularly, the surface porosity, the effective aperture, the sodium sulfate retention rate, the sodium chloride retention rate, the flux of sodium sulfate, the flux of sodium chloride and other properties of the nanofiltration membrane can be designed and accurately controlled according to requirements, and the properties of the nanofiltration membrane can be accurately designed and customized by adopting the method disclosed by the invention; the performance of the green and natural modified hollow fiber ultrafiltration membrane is realized, and an innovative solution is provided for high-salt resource recovery.

The invention provides a preparation method of a polyamide thin-layer composite membrane, which is characterized by comprising the following steps: pretreating a base membrane, and adsorbing amino active groups on the surface of the pretreated base membrane; taking the base membrane out of the solution and then placing the base membrane below a base membrane reaction chamber; carrying out microwave vaporization on an organic phase solution containing polyacyl chloride, introducing the vaporized organic phase solution into a base membrane reaction chamber, and carrying out vapor / liquid interfacial polymerization reaction on the vaporized organic phase solution and the base membrane; and carrying out heat treatment on the reacted membrane material to finally obtain the polyamide thin-layer composite membrane product. According to the preparation method of the polyamide thin-layer composite membrane, provided by the invention, the polymerization process can be more finely controlled, and the structural performance of the membrane can be adjusted. The utilization rate of the solvent is improved, the environmental pollution is reduced, and meanwhile, the high efficiency of the process and the high reproducibility of the result are ensured. The invention also provides a polyamide thin-layer composite membrane and application thereof.

The invention provides a perfluoroethanone microcapsule and a preparation method thereof, and belongs to the technical field of fire extinguishing materials, the perfluoroethanone microcapsule comprises a core and a shell layer; the core comprises perfluorohexanone and fumed silica; the shell layer comprises isophorone diisocyanate, diethylenetriamine and a chlorine-containing monomer, and the isophorone diisocyanate, the diethylenetriamine and the chlorine-containing monomer are subjected to an interfacial polymerization reaction to form a polyurea-polyurethane hybrid network; the mass ratio of the shell to the core of the microcapsule is 1: (5-20); the anhydrous microcapsule core is constructed through an oil-in-oil type anhydrous interfacial polymerization system, so that the hydrolysis side reaction is fundamentally avoided, the microcapsule has higher stable encapsulation efficiency, and the reliability and long-term effectiveness of the product in the storage and use processes are ensured.

The invention discloses a fire extinguishing microcapsule and a preparation method thereof, and belongs to the technical field of fire extinguishing. The fire extinguishing microcapsule comprises a capsule core and a capsule shell, and the raw material for preparing the capsule core comprises a water-based fire extinguishing agent; the capsule shell comprises an interfacial polymerization layer and a UV curing layer which are sequentially arranged from inside to outside, and the water-based fire extinguishing agent is wrapped in the interfacial polymerization layer. On one hand, the interfacial polymerization layer is a film formed through interfacial polymerization reaction, namely, the interfacial polymerization layer is formed by utilizing the hydrophilicity of the water-based fire extinguishing agent and the lipophilicity of the capsule shell, so that the sealing performance and the flexibility are improved; and on the other hand, the UV curing layer is formed by curing the raw materials for preparing the capsule shell through cross-linking under ultraviolet irradiation, so that the impact resistance and the deformation resistance of the capsule shell can be enhanced, and the mechanical strength and the high temperature resistance of the capsule shell are improved. In addition, the UV curing layer on the outer side and the interfacial polymerization layer on the inner side are sequentially formed in stages, the mechanical strength of the capsule shell is improved, and meanwhile the possibility of permeation loss of the water-based fire extinguishing agent is reduced.

The invention belongs to the field of functional composite fabrics, and provides a mosquito-repellent thermoplastic polyurethane composite fabric and a preparation method thereof.According to the mosquito-repellent thermoplastic polyurethane composite fabric and the preparation method thereof, the design that mosquito-repellent microcapsules of a core-shell structure are dispersed in a thermoplastic polyurethane hot melt adhesive layer is adopted, a microcapsule core layer comprises mosquito-repellent active ingredients such as icaridin, deet or dimethyl phthalate, and the mosquito-repellent active ingredients are dispersed in a thermoplastic polyurethane hot melt adhesive layer; the shell layer is made of a polyurea material and is prepared through an interfacial polymerization method, high-load stable dispersion and controllable dot matrix film forming of the microcapsule in a hot melt adhesive system are achieved, the content of the microcapsule can reach 0.5-15 wt%, the particle size is controlled to be 0.1-2.0 m, the drug loading capacity reaches 10-60 wt%, the problem that the mosquito-repelling microcapsule is prone to damage and failure in the high-temperature melting mixing and hot-pressing compounding process is solved, and the mosquito-repelling microcapsule has good application prospects. The prepared composite fabric is high in mosquito repelling rate, still keeps an effective mosquito repelling function after being washed for multiple times, and has a wide application value.

The invention provides a dye / ion separation membrane with pore diameter and charge coordinated regulation and control as well as a preparation method and application thereof, and belongs to the field of preparation of a double-layer ionic covalent organic framework (COFs) composite membrane. An aromatic polyamide ultrafiltration membrane is used as a base membrane, and a double-layer COFs membrane is constructed on the surface of the aromatic polyamide ultrafiltration membrane through a multi-time interfacial polymerization method. The first layer is a positive charge COFs layer formed by reacting a guanidyl monomer with 1, 3, 5-triformyl phloroglucinol (Tp); and the second layer is a negative charge COFs layer formed by reacting ionic aromatic diamine with Tp. By adjusting the type and concentration of the monomers, the pore diameter and charge distribution of the film layer can be synergistically regulated and controlled, and the double-layer composite film which is stable in structure and orderly stacked is constructed. The obtained membrane has molecular sieve separation and electrostatic regulation functions, can efficiently intercept organic dye molecules in high-salt printing and dyeing wastewater, and has high flux, high selectivity and good chemical stability.

The invention discloses a flow battery proton exchange membrane, and particularly discloses a flow battery proton exchange membrane which is prepared by sequentially soaking a substrate material in a water phase solution and an organic phase solution, generating a skin layer film through interfacial polymerization, and then performing ultraviolet irradiation and post-treatment. 3, 3 '-diaminobiphenyl and an organic monomer are subjected to interfacial polymerization reaction on the surface of a substrate material, the proton exchange membrane with a cross-linked structure is formed through ultraviolet irradiation, and the proton exchange membrane is thin in separation layer, resistant to acid and alkali and good in chemical stability. The proton exchange membrane for the redox flow battery can be applied to an all-vanadium redox flow battery, an iron / chromium redox flow battery, a zinc / bromine redox flow battery, a sulfur / bromine redox flow battery, a sulfur / iron redox flow battery, a vanadium / bromine redox flow battery or a vanadium / iron redox flow battery.

The invention belongs to the technical field of reverse osmosis membranes, and particularly relates to a high-flux reproducible chlorine-resistant reverse osmosis composite membrane and a preparation method thereof.Monomer 3, 5-diamino-1, 2, 4-triazole is added into a water-phase solution, functional amino and imino groups of the monomer react with acyl chloride groups, and the high-flux reproducible chlorine-resistant reverse osmosis composite membrane is prepared by adjusting the structure of a polyamide layer; the separation performance of the membrane can be improved while the water flux of the membrane is not obviously reduced. According to the reverse osmosis composite membrane preliminarily obtained through interfacial polymerization reaction, aniline dimer diaminodiphenylamine is adopted as a modification material, and chemical grafting modification of the membrane surface is carried out on a polyamide composite membrane. The characteristic that the redox potential of a secondary amine group on diaminodiphenylamine is lower than that of an amide group on a polyamide polymer is utilized, the secondary amine group can serve as a sacrificial group to react with active chlorine preferentially, protection of a polyamide separation layer is achieved, and therefore the chlorine resistance of the composite membrane is improved. In addition, diaminodiphenylamine has the same reversible redox characteristic as aniline, and reversible regeneration of chlorine resistance of the grafted membrane can be realized through Na2S2O3 reduction; therefore, the high-flux reproducible chlorine-resistant reverse osmosis composite membrane disclosed by the invention is a reverse osmosis composite membrane based on aniline dimer surface modification, and has the characteristics of high flux, reproducibility, excellent chlorine resistance, good water separation performance, better hydrophilicity and salt rejection rate.

The invention discloses a high-flux high-pollution-resistance nanofiltration membrane as well as a preparation method and application thereof. The scheme is realized by constructing a gradient separation layer compounded by modified MOF and polyamide on a porous support layer; the preparation method comprises the following steps: preparing a water phase from modified MOF grafted with carboxylate radical and sulfonate ion recognition groups on the surface, a polyamine monomer and an ion channel regulator, carrying out interfacial polymerization on the water phase and an oil phase containing a fluorine-containing acyl chloride monomer on the surface of a porous support membrane, and carrying out heat treatment and metal ion post-treatment, the modified MOF in gradient distribution in the nanofiltration membrane can specifically adsorb Ca < 2 + >, Mg < 2 + > and other scaling ions, and scale formation is inhibited from the source; the composite structure simultaneously realizes high flux and high selectivity; the retention rate of the membrane to Na2SO4 under 0.6 MPa is greater than or equal to 99.2%, the retention rate of the membrane to NaCl is less than or equal to 15%, the flux of pure water is greater than or equal to 20 L.m <-2 >. H <-1 >. Bar <-1 >, and the flux attenuation rate is less than or equal to 16.7% after the membrane runs in high-hardness, high-COD and high-salinity wastewater for 120 hours; the scheme is particularly suitable for zero-discharge pretreatment of high-salinity wastewater such as solid waste percolate with the TDS of 5-30% and chemical engineering.

The invention relates to the technical field of water treatment membranes, in particular to a polyamide reverse osmosis membrane with anti-fouling performance and a preparation method of the polyamide reverse osmosis membrane. The polyamide reverse osmosis membrane is prepared by the method. The method comprises the following steps: S1, preparing a first diaphragm; and S2, immersing the first membrane into an amino compound solution for interfacial polymerization reaction, and then cleaning to obtain a second membrane, namely the polyamide reverse osmosis membrane. And S3, coating the second membrane with an alcohol polymer solution, and then carrying out second drying treatment to obtain the polyamide reverse osmosis membrane containing the coating. According to the invention, the polyamide reverse osmosis membrane with remarkable anti-pollution performance on cationic pollutants can be prepared.

The invention provides a self-healing-shape memory phase change microcapsule for cooling drilling fluid as well as a preparation method and application of the self-healing-shape memory phase change microcapsule, and belongs to the technical field of cooling of the drilling fluid and underground heat management. The preparation method of the phase change microcapsule comprises the following steps: fully dispersing a polyurethane prepolymer, a polyimide solution and hydrophobic nanocellulose in an organic solvent to obtain an oil phase; dissolving a phase change material in deionized water to obtain a water phase; under a shearing condition, dropwise adding the oil phase into the water phase, and emulsifying to form a stable oil-in-water type Pickering emulsion; and adding an aqueous solution of a chain extender, and carrying out interfacial polymerization reaction, centrifugation, washing and drying. The phase change microcapsule disclosed by the invention shows excellent cyclic service performance under the underground high-temperature and high-shear conditions, and structure repair and morphology recovery can still be realized by virtue of self-healing and shape memory effects even if a shell layer is damaged, so that the service life of the phase change microcapsule is prolonged, and the cooling persistence of the drilling fluid is improved.

The invention belongs to the technical field of artificial veneers, and particularly relates to a fragrance-releasing blue-light-resistant microcapsule and a preparation method thereof, impregnated bond paper of the fragrance-releasing blue-light-resistant microcapsule, a fragrance-releasing blue-light-resistant ecological board and a preparation method of the fragrance-releasing blue-light-resistant ecological board. The technology aims at solving the problems of indoor blue light harm and air quality, and the problems that in the prior art, stable coexistence of a fragrance releasing component and an anti-blue-light component is difficult, and the technology is not compatible. The core is to prepare a multifunctional microcapsule through a unique interfacial polymerization and Schiff base in-situ reaction synchronous process: compound plant essential oil is taken as a core material, a vanillin-polyethyleneimine Schiff base conjugated structure is generated in situ in a wall material, and nanoparticles are cross-linked and fixed, so that a polyurethane / polyurea wall material is formed. The microcapsule is added into an adhesive layer of impregnated bond paper, and then is compounded with a base material through hot pressing to prepare the ecological board. The fragrance releasing and blue light resisting functions are successfully integrated on the board body, the effects that the blue light absorptivity at the wave band of 400-450 nm is larger than or equal to 70%, the formaldehyde release amount is smaller than or equal to 0.025 mg / m, and the fragrance is lasting are achieved, and the technology is highly compatible with an existing production line.

The invention discloses a lithium-magnesium separation membrane based on pore size screening-coordination synergy as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The surface of a porous ultrafiltration membrane is used as a water phase-oil phase interface, and polyamine monomers in a diamine / lithium ion selective coordination molecule / surfactant mixed aqueous solution and polyacyl chloride monomers in an organic phase are subjected to interfacial polymerization reaction at the interface, so that a polyamide separation layer is formed; the surfactant regulates diffusion and distribution of amine monomers to form a narrow-aperture polyamide network; wherein lithium ion selective coordination molecules are embedded in the narrow-aperture polyamide network under the action of hydrogen bonds and the like to form a lithium ion selective channel, so that the lithium-magnesium separation membrane based on aperture screening-coordination synergy is obtained. The retention rate of the lithium-magnesium separation membrane to a 1000ppm MgCl2 aqueous solution is as high as 95% or above, and the retention rate of the lithium-magnesium separation membrane to a 1000ppm LiCl aqueous solution is as low as 50% or below.

The invention discloses a composite membrane with adsorption separation and catalytic degradation functions as well as a preparation method and application of the composite membrane. The composite membrane is supported by a porous base membrane, a polyamide separation layer formed by reaction of a 3, 4-dihydroxyphenylethylamine and 2, 3-diaminophenol comonomer and acyl chloride is constructed on the surface of the porous base membrane through interfacial polymerization, and FeCo-g-C3N4 nanosheets are anchored in situ; the membrane can efficiently activate peroxymonosulfate (PMS) to generate free radicals under the nearly neutral condition, efficient interception and catalytic degradation of organic pollutants (such as antibiotics) are synchronously achieved, and heavy metal ions (such as Pb < 2 + > and Cd < 2 + >) are adsorbed through a functional monomer structure; the invention provides an interfacial polymerization preparation method of the membrane. The composite membrane breaks through the limitation of'only interception but not degradation 'of a traditional membrane, realizes integration of'separation-adsorption-degradation', can remarkably reduce the volume of concentrated water and reduce the toxicity of the concentrated water, and is suitable for advanced treatment of wastewater containing composite pollutants in the industries of pharmacy, printing and dyeing and the like.

The invention relates to a selective nanofiltration membrane as well as a preparation method and application thereof. The selective nanofiltration membrane comprises a support layer and a separation layer, the separation layer is obtained through interfacial polymerization of an oil-phase reactant and a water-phase reactant; the water-phase reactant comprises a negatively charged monomer and a positively charged monomer; the positively charged monomer comprises any one or a combination of at least two of polyvinylamine, polyethyleneimine, diethylenetriamine, water-soluble chitosan, quaternized polyethyleneimine, polyallylamine or triethylene tetramine. According to the method, monomers with different charges are added into a water phase, so that the nanofiltration membrane is wholly charged and neutral, the interception of sodium sulfate can be effectively reduced, the interception of antibiotics is increased, and the separation of the antibiotics and inorganic salts can be efficiently promoted.

The application belongs to the technical field of membrane preparation, and discloses a heavy metal enrichment block polymer nanofiltration membrane and a preparation method, which comprises the following steps: constructing an ultrafiltration base film: by controlling the proportion of sulfonated polyether sulfone (SPES-F) oligomers and polyether sulfone (PES-OH) oligomers, a block structure polymer with different hydrophilic / hydrophobic segment ratios is synthesized, and finally the block structure polymer is constructed into a base film with uniform pore size, high flux and strong stability; interface polymerization modification: on the surface of the hydrophilic base film, a dense and ordered grid-shaped separation layer is generated by interface polymerization (IP). By adjusting the microstructure of the skin layer, an ultrathin skin layer is constructed, and the structural stability of the base film and the skin layer is cooperatively adjusted, so that the thin skin layer realizes short-range low-resistance and effective screening function.

The invention discloses a washable, wear-resistant and uvioresistant polyarylate fiber as well as a preparation method and application of the washable, wear-resistant and uvioresistant polyarylate fiber. The method sequentially comprises the following steps: carrying out surface activation on fibers by adopting a deep eutectic solvent, spraying a TiO2 / organic ultraviolet absorbent UV1130 compound solution to construct an anti-ultraviolet layer, and carrying out interfacial polymerization by utilizing polyethyleneimine and trimesoyl chloride to form a polyamide encapsulation layer. The polyamide film can firmly coat the ultraviolet screening agent and anchor the ultraviolet screening agent on the surface of the fiber, so that the ultraviolet resistance of the polyarylester fiber is remarkably improved, meanwhile, the polyarylester fiber is endowed with excellent durability, the UPF retention rate is still higher than 90% after 10 times of standard washing or 200 times of friction, and the polyarylester fiber has excellent washing resistance and wear resistance. The process is simple, green and efficient, and the prepared composite fiber has wide application prospects in the fields of outdoor protection, intelligent spinning and the like.

The invention belongs to the field of seawater desalination separation membrane preparation, and particularly relates to a preparation method and application of a seawater desalination reverse osmosis membrane with oxidation resistance. The preparation process of the reverse osmosis membrane for seawater desalination is adjusted, and a micromolecular antioxidant containing a phenolic hydroxyl group and a tert-butyl structure is introduced in a swelling-embedding manner after interfacial polymerization is completed, so that on one hand, the oxidation resistance of the reverse osmosis membrane is improved, and on the other hand, the embedding of the micromolecular antioxidant makes up for the defects of a polyamide layer; the desalination and boron removal capabilities are improved. The antioxidant capacity of the polyamide can be improved under the condition that the desalting capacity of the polyamide is not sacrificed. The seawater desalination reverse osmosis membrane prepared by the method provided by the invention has higher oxidation resistance and better desalination and boron removal capabilities than an original membrane.

The invention relates to a high-effect reverse osmosis membrane as well as a preparation process and application thereof, and belongs to the technical field of water treatment. The preparation method comprises the following steps: soaking a base membrane in a water-phase solution, taking out the base membrane, drying the surface of the base membrane, coating the base membrane with an oil-phase solution for interfacial polymerization reaction, and curing to obtain the reverse osmosis membrane; and coating the surface of the reverse osmosis membrane with the modified liquid, and drying to obtain the high-efficiency reverse osmosis membrane. Wherein the formula of the modified liquid comprises the following components in parts by weight: 3 to 5 parts of polyvinyl alcohol, 1 to 3 parts of polyacrylic acid, 0.3 to 0.5 part of citric acid, 0.1 to 0.3 part of cocamidopropyl hydroxysulfobetaine, 0.05 to 0.1 part of modified carbon nitride quantum dot dispersion liquid and 60 to 80 parts of deionized water. The reverse osmosis membrane prepared by the invention has excellent water flux, salt rejection rate and stain-resistant and self-cleaning functions.

The invention discloses an acid-resistant nanofiltration membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The gradient heterojunction active layer is formed on the base film through sequential interfacial polymerization and comprises a polysulfonamide bottom layer adjacent to the base film and a polyamine-metal organic framework composite layer located on the polysulfonamide bottom layer; the gradient heterojunction active layer is coated with the pH response self-repairing layer, and the self-repairing layer comprises pH response type microcapsules dispersed in cross-linked polyvinyl alcohol hydrogel; the membrane has excellent self-repairing capability and maintenance convenience, the repairing efficiency of artificial microcosmic damage in an acid environment within 24 hours can reach 85% or above, tiny scratches and defects generated in the operation or installation process of the membrane can be automatically repaired, the failure of the whole membrane element caused by tiny damage expansion is avoided, and the service life of the membrane element is prolonged. And the unplanned shutdown risk and the special repair and maintenance cost are reduced.