486 results about "Polysulfone" patented technology

The invention relates to the technical field of reverse osmosis membrane supports, in particular to a polyester non-woven fabric and a preparation method and application thereof.The preparation method comprises the steps that S1, polyester main body fibers and polyester adhesive fibers are used as raw materials to prepare high-quantitation original cloth M0 and low-quantitation original cloth H0; carrying out hot pressing pretreatment on the H0 to obtain a product H0 '; s2, overlapping and hot-pressing M0 and H0 'to obtain a composite non-woven fabric M1H1; s3, the M1H1 is impregnated with a functional solution, and the functional solution contains para-aramid nanofibers and nano calcium carbonate modified by hexadecyl trimethyl ammonium bromide; and then carrying out cold pressing on the composite non-woven fabric impregnated with the functional solution to obtain the nano-material modified composite non-woven fabric. And S4, carrying out secondary hot pressing treatment to obtain the polyester non-woven fabric. The polyester non-woven fabric can effectively avoid the problems of excessive curling, excessive permeation of a polysulfone solution and the like during curing after being coated with polysulfone, and is more beneficial to application in a reverse osmosis membrane.

The present invention discloses a high-performance reverse osmosis membrane and a method for preparing the same. The reverse osmosis membrane comprises a polyester non-woven fabric layer, a polysulfone-based membrane, and a polyamide skin layer stacked in sequence. The polysulfone-based membrane has a micron-scale prism structure on the side away from the polyester non-woven fabric layer. The preparation method comprises coating the surface of the polyester non-woven fabric layer with the polysulfone-based membrane, and forming the micron-scale prism structure on the surface of the polysulfone-based membrane by cold pressing with a roller mold during the process of converting the polysulfone-based membrane from a liquid state to a solid state. The present invention improves the flux without affecting the desalination rate of the reverse osmosis membrane or sacrificing the thickness of the skin layer, thereby resolving the trade-off between flux and desalination in the current technology. At the same time, the micron-scale prism structure can be designed into different shapes according to performance requirements, thereby achieving precise control of the flux performance of the reverse osmosis membrane.

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 membrane includes a polysulfone-based support, a polydopamine (PDA) layer disposed on a surface of the polysulfone-based support, and a silver / polydopamine (Ag / PDA) composite layer disposed on a surface of the polydopamine layer. The polysulfone-based support has a pore size of up to 600 nanometers (nm). The Ag / PDA composite layer contains core-shell structure particles and spherical particles. The core-shell structure particles have a silver nanoparticle core and a polydopamine shell. The spherical particles are silver-decorated polydopamine particles. The membrane can at least partially separate an Erichrome Black T (EBT) dye from an EBT dye / salt containing mixture by rejecting the EBT dye and allowing the EBT dye / salt containing mixture to pass through the membrane.

The invention discloses a phase-change heat-storage fluffy fiber and a preparation method thereof. According to the method, polyethylene glycol, microcapsules, fatty acid, paraffin or alkane and the like are used as phase change heat storage materials, elastic polymers such as polystyrene, polyurethane, polyamide and the like are used as elastic spinning materials, and hydrophobic polymers such as polyacrylonitrile, polysulfone, polytetrafluoroethylene, polyvinylidene fluoride and the like are used as hydrophobic spinning materials; the phase-change heat-storage fluffy fiber is prepared in a high-humidity environment through an electrostatic spinning method. The phase-change heat-storage fluffy fiber synthesized by the method is in a flexible fluffy form and has the advantages of good phase-change stability, low heat conductivity coefficient and the like, and the environmental temperature is kept stable through an accompanying heat absorption or heat release effect when phase change occurs at the phase-change temperature; the material can be used as a thermal insulation filling material and has wide application prospects in human body and environment thermal management and other aspects.

The invention relates to the technical field of antistatic agents, and particularly discloses an oil product antistatic agent and a preparation method thereof. The modified polysulfone is obtained by mixing and treating the following raw materials in parts by mass: 35-40 parts of xylene, 20-25 parts of composite polyamine, 15-20 parts of polysulfone, 5-8 parts of oligomeric dopamine and 1-2 parts of an activating agent, the preparation method comprises the following steps: taking composite polyamine, mixing with oligomeric dopamine, dispersing with xylene, then adding an activator, stirring, then adding polysulfone, and continuously treating, thereby obtaining the product. The preparation method of the composite polyamine comprises the following steps: taking epichlorohydrin, dispersing, adding a mixed amine source, heating, adding sodium carbonate, continuously stirring, cooling, adding a deprotection agent, filtering after treatment, taking a liquid part, drying by distillation, washing, drying again, and grinding to obtain the composite polyamine. The oil product antistatic agent prepared by the invention has relatively strong antistatic capability and relatively long duration time, and can form a firmer double-electric-layer structure.

The invention belongs to the technical field of new materials, and relates to a layered double hydroxide film using polysulfone resin as a binder, and the layered double hydroxide film is obtained by connecting layered double hydroxide particles or layered double hydroxide nanosheets into a continuous film by using the polysulfone resin as the binder. The invention further relates to a preparation method and application of the layered double hydroxide film with the polysulfone resin as the binder. The layered double hydroxide membrane provided by the invention adopts the LDH with anionic conductivity as a main body, and the surface resistance of the layered double hydroxide membrane in an alkaline solution is obviously lower than that of a commodity Zirfon membrane, so that the membrane provided by the invention can show higher electrolysis efficiency when being used for water electrolysis. The membrane forming method is based on the common phase inversion principle in separation membrane preparation in the field of chemical separation, so that large-scale preparation can be conveniently achieved through technological parameter change on the basis of mature industrial equipment for separation membrane phase inversion preparation, and batch preparation is easy to achieve.

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 low-pressure reverse osmosis membrane comprises a non-woven fabric base material, a polysulfone porous supporting layer and a polyamide functional layer. According to the low-pressure reverse osmosis membrane, the non-woven fabric base material is adopted for providing basic support, the polysulfone porous supporting layer has proper thickness and pore diameter, and a stable and transparent supporting structure is established for the polyamide functional layer. Nano titanium dioxide particles are introduced into the polyamide functional layer, and the particle size and the content of the nano titanium dioxide particles and the thickness and the surface carboxyl density of the polyamide functional layer are accurately controlled. Nano titanium dioxide particles are uniformly dispersed in a polyamide network, so that the hydrophilicity and surface charge distribution of a separation layer are effectively improved, and the resistance of water molecules passing through the membrane is reduced, thereby realizing high water flux; meanwhile, the structural stability of the polyamide composite layer is enhanced, and the mechanical strength and pollution resistance of the membrane are improved. Charge distribution and hydrophilicity on the surface of the membrane are adjusted by proper carboxyl density, water molecules are promoted to quickly pass through, solutes such as salt are effectively intercepted, and high desalination rate is realized.

The invention belongs to the technical field of ion exchange membranes, and relates to a bipolar membrane and a preparation method thereof.The bipolar membrane comprises a cation exchange membrane, an anion exchange membrane and a middle layer; the cation exchange membrane is sulfonated polysulfone; the anion exchange membrane is aminated chloromethyl polysulfone; and the middle layer is prepared by reacting an organic amine compound with vinyl and chloromethyl polysulfone. The substrates of the three layers of polymers of the bipolar membrane are all made of polysulfone materials, the swelling characteristics of the materials are consistent, the affinity among the three layers is appropriate due to the fact that the three layers are made of the same material, the affinity among the layers of the bipolar membrane is easy to be tight, meanwhile, the stability of the middle catalyst layer is enhanced through a cross-linking method, and the stability of the middle catalyst layer is improved. The loss of the catalytic effect is prevented; the technical problem that the middle layer is prone to loss or blistering is solved.

The invention relates to a reverse osmosis membrane and a preparation method thereof, and the preparation method comprises the following steps: immersing a polysulfone-based membrane into a dopamine-containing mixed solution, and carrying out constant-temperature oscillation to form a dopamine pretreatment layer so as to obtain a modified base membrane; dissolving rosmarinic acid ester modified m-phenylenediamine, piperazine, a surfactant, an auxiliary agent and a pH regulator in water, and stirring for dissolving to obtain a water phase solution; dissolving an acyl chloride monomer in an organic solvent, stirring and dissolving, then adding the modified titanium dioxide, and carrying out ultrasonic dispersion to obtain an oil phase solution; immersing the modified base membrane into the water phase solution, taking out the modified base membrane, immersing the modified base membrane into the oil phase solution, taking out the modified base membrane and drying the modified base membrane to obtain a pre-compounded reverse osmosis membrane; and carrying out post-treatment on the pre-compounded reverse osmosis membrane to obtain the reverse osmosis membrane. Under the condition that the water yield is guaranteed, the reverse osmosis membrane disclosed by the invention has a high desalination rate and the oxidation resistance of the reverse osmosis membrane is improved for a long time.

The application belongs to the technical field of porous adsorption membrane materials, and discloses a titanium lithium ion porous adsorption membrane material and a self-assembly preparation method and application thereof. The preparation method comprises the following steps: dissolving a film-forming polymer in a dispersion liquid containing MXene nanosheets to form a uniform precursor liquid; the MXene nanosheet is a carbide, nitride or carbonitride of a transition metal with a single-layer structure; dispersing a titanium lithium composite oxide in the precursor liquid to form a casting solution; coating the casting solution on a support, and then performing phase inversion by using pure water to obtain a matrix film; placing the matrix film in a lithium elution liquid for immersion washing, replacing lithium ions in the matrix film, and causing a self-assembly reaction of the titanium lithium composite oxide in the matrix film, so that the titanium lithium ion porous adsorption membrane material is obtained. The application innovatively introduces MXene nanosheets and a polysulfone matrix film, fixes the MXene nanosheets on the polysulfone matrix film as an in-situ growth substrate of the titanium lithium composite oxide, and the obtained membrane material has a high adsorption capacity.

The invention discloses cyano-terminated modified polysulfone and a preparation method thereof. The terminal cyano group is selected from at least one of the following groups: n, m, p, q and r are independently 0 or 1; r1, R2, R3 and R4 are respectively and independently selected from any one of H, methyl, trifluoromethyl and cyano. Through molecular structure design, a polar group (cyano) with large dipole moment is introduced into the end group of polysulfone to prepare the cyano-terminated modified polysulfone and the film thereof. According to the polysulfone provided by the invention, the cyano group at the chain end has a relatively large degree of freedom, and when the cyano group is subjected to sub-Tg polarization, the steric hindrance is relatively small. Therefore, the cyano-terminated modified polysulfone can maintain relatively low dielectric loss and high Tg while increasing the dielectric constant.

A method for preparing a composite nanofiltration membrane based on aspartic acid modified carbon quantum dots belongs to the field of nanofiltration membrane preparation, and comprises the following steps: 1) dissolving citric acid monohydrate in water, adding aspartic acid, heating and stirring, and then adding a sodium hydroxide solution to adjust pH; (2) carrying out suction filtration on the mixed solution obtained in the step (1) by using a microfiltration membrane, dialyzing and purifying in ultrapure water, and freeze-drying to obtain the aspartic acid modified carbon quantum dots; (3) fixing a polysulfone base membrane in a mold, preparing a water-phase solution containing anhydrous piperazine and aspartic acid modified carbon quantum dots, pouring the water-phase solution into the mold to be in contact with the base membrane, and air-drying; and 4) preparing a trimesoyl chloride solution by using n-hexane as a solvent, pouring the trimesoyl chloride solution into a mold for contact, and finally drying to obtain the composite nanofiltration membrane.When the concentration of the aspartic acid modified carbon quantum dots is 2000ppm, the water flux reaches 168LMH, the retention rate reaches a peak value when the concentration of the quantum dots is 1000ppm and is 1.3 times of that of a base membrane, and the composite nanofiltration membrane shows excellent performance.

The invention discloses a polyolefin composition as well as a preparation method and application thereof, and belongs to the field of high polymer materials. According to the application, a specific amount of polysulfone resin is added into the polyolefin resin, so that the skid resistance and the dimensional stability of the polyolefin resin are improved; according to the present invention, the specific amount of the surfactant type antistatic agent is added so as to improve the antistatic property and the skid resistance, and the surfactant type antistatic agent and the polysulfone resin can synergistically improve the skid resistance, such that the obtained polyolefin composition has characteristics of high surface friction coefficient, good antistatic property and good dimensional stability, the material is suitable for products such as non-slip mats, wood-plastic floors, loose tubes and the like.

The invention discloses a hydrophobic gas diffusion electrode loaded with silver nanoparticles and application of the hydrophobic gas diffusion electrode in electrocatalytic carbon dioxide reduction, and belongs to the technical field of electrocatalysis. The hydrophobic gas diffusion electrode comprises a gas diffusion layer and a catalyst layer sprayed on the gas diffusion layer; the catalyst layer comprises a silver nanoparticle catalytic material, a first ionomer and a second ionomer; wherein the first ionomer is a fluororesin ionomer, and the second ionomer is a quaternized polysulfone ionomer. A system for preparing CO by reducing CO2 through electro-catalysis is constructed, the system comprises an MEA electrolytic cell, a cathode, an anode and an anion exchange membrane, and the cathode adopts the hydrophobic gas diffusion electrode loaded with the silver nanoparticles. The preparation method is mild in preparation condition and environmentally friendly, the modified hydrophobic gas diffusion electrode has high hydrophobicity, efficient conversion of CO2 can be achieved under the high current density, FECO can reach 96.5% under the high current density, and excellent catalytic performance is shown.

The present invention provides a denitrification and dephosphorization composite filler, a preparation method and application. The composite filler is prepared with a polysulfone polymer as a skeleton and a hybrid denitrification electron donor material by an immersion precipitation phase conversion method. The composite filler designed by the present invention has uniform ball formation and strong controllable performance, solves the problem of poor stability of denitrification and dephosphorization in a system due to the disadvantages of easy system blockage, high consumption speed, weak synergy, etc. in the traditional improved medium, and has broad application prospects in wastewater treatment.

The invention discloses a polyfunctional group synergistic reverse osmosis membrane and a preparation method thereof, and relates to the technical field of new materials and membrane separation. The polysulfone porous base membrane is sequentially soaked in a water phase monomer solution and an oil phase monomer solution, the polyamide reverse osmosis membrane is prepared through interfacial polymerization, sulfonic acid groups are introduced in the process, and water transfer channels are increased; soaking in an aminobenzene sulfonic acid aqueous solution, and introducing a benzenesulfonic acid group to improve the hydrophilicity of the reverse osmosis membrane; then treating with a sodium nitrite aqueous solution, and carrying out diazotization coupling reaction on the surface, so as to improve the crosslinking degree of the polyamide separation functional layer. The reverse osmosis membrane is cleaned by using a sodium sulfite aqueous solution, and an unreacted diazo group is replaced by a sulfurous acid group, so that the surface stability of the reverse osmosis membrane is improved. The preparation method provided by the invention is easy to control and simple in process, and the reverse osmosis membrane obtained by the preparation method has a synergistic effect of polyfunctional groups, so that the desalination rate and the water permeation flux of the reverse osmosis membrane are both improved, and the reverse osmosis membrane can be applied to the fields of purified water preparation, industrial sewage and wastewater deep treatment, seawater desalination and the like.

The invention discloses a preparation method of an organic-inorganic composite microcapsule as well as an obtained product and application of the organic-inorganic composite microcapsule. The preparation method comprises the following steps: firstly, preparing a MoS2-metal composite material by adopting pulse laser irradiation, mixing the MoS2-metal composite material, PAO5 oil, polysulfone and an organic solvent to obtain an organic phase, and dissolving lauryl sodium sulfate and polyvinyl alcohol in water to obtain a water phase; and mixing the organic phase and the water phase, and obtaining the microcapsule by adopting a solvent evaporation method. The method disclosed by the invention is simple to operate and low in cost, and the obtained microcapsule can automatically store a lubricant and has excellent tribological performance in the friction process.

The invention discloses a Span80 modification-based lithium-magnesium separation polyamide nanofiltration membrane and a preparation method thereof, and the preparation method comprises the following steps: (1) dissolving polyvinylpyrrolidone and polysulfone in N-methyl pyrrolidone, heating and stirring, and then carrying out ultrasonic defoaming and standing to obtain a polysulfone membrane casting solution; (2) blade-coating the surface of a glass plate with the polysulfone membrane casting solution, standing, and immersing the glass plate in deionized water to obtain a polysulfone ultrafiltration membrane; (3) coating an aqueous solution containing a piperazine monomer on the surface of a polysulfone ultrafiltration membrane, standing, and removing an aqueous phase solution on the surface of the membrane; (4) coating the surface of the membrane obtained in the step (3) with an organic solution containing Span80 and trimesoyl chloride monomers, and removing the organic phase solution on the surface of the membrane after standing; and (5) carrying out curing heat treatment on the membrane obtained in the step (4) to obtain the lithium-magnesium separation polyamide nanofiltration membrane based on Span80 modification. According to the polyamide nanofiltration membrane prepared by the invention, the lithium-magnesium separation effect and the stability are remarkably enhanced.

The invention relates to a method for synergistically regulating and controlling the aperture of a material separation membrane based on electric field-vacuum heating, which comprises the following steps: S1, uniformly mixing polysulfone, an additive and a solvent, and preparing a supporting layer membrane casting solution; s2, coating the surface of a polyolefin-based microfiltration membrane with the supporting layer membrane casting solution obtained in the step S1, and preparing a polysulfone ultrafiltration base membrane through immersion precipitation phase inversion; s3, uniformly mixing sulfonated polysulfone, N, N-dimethylformamide, ethylene glycol monomethyl ether and a pore-preserving agent to prepare a sulfonated polysulfone separation layer membrane casting solution; and S4, coating the surface of the polysulfone ultrafiltration base membrane obtained in the step S2 with the sulfonated polysulfone separation layer membrane casting solution obtained in the step S3, applying a direct-current electric field perpendicular to the surface of the membrane, and simultaneously performing vacuum heating to obtain the material separation membrane. An electric field and vacuum heating synergistic technology is adopted to induce oriented arrangement of sulfonated polysulfone to form an ordered structure, the membrane pore size and the membrane structure consistency are accurately controlled, and the membrane permeation flux and separation selectivity are optimized.

The present invention belongs to the technical field of modified polysulfones, and particularly relates to a modified polysulfone and a preparation method thereof, as well as a heparin-modified polysulfone hollow fiber membrane and a preparation method thereof. The modified polysulfone is mainly composed of a sulfonated polysulfone main chain and covalently grafted heparin side chains. By sulfonating the polysulfone, the mechanical properties and anti-coagulant properties of the polysulfone material are improved to a certain extent. The sulfonated polysulfone is then heparinized to maintain the excellent mechanical properties of the polysulfone material and significantly improve the anti-coagulant properties of the polysulfone material. The prepared heparin-modified sulfonated polysulfone is blended with a spinning solution to prepare a hollow fiber membrane. The membrane material improves the ultrafiltration rate while maintaining the sieving coefficient, significantly increases the membrane life, and prevents the shedding of membrane components. The hollow fiber membrane is particularly suitable for hemodialysis equipment.

The invention relates to a preparation method and application of sulfonated polysulfone. The preparation method of sulfonated polysulfone comprises the following steps: providing polysulfone, and providing a predetermined reagent; carrying out chloromethylation reaction on the polysulfone and bis (chloromethoxy) butane to obtain chloromethylated polysulfone; the predetermined reagent and chloromethyl in the chloromethylated polysulfone are subjected to a nucleophilic substitution reaction, sulfonated polysulfone is obtained, and the predetermined reagent is at least one of 4-hydroxybenzene sulfonate, 1, 2-dihydroxybenzene-3, 5-disulfonic acid disalt and dodecylbenzene sulfonate. According to the sulfonated polysulfone provided by the embodiment of the invention, the volume change is relatively small when the sulfonated polysulfone absorbs water and swells, so that the sulfonated polysulfone has relatively strong anti-swelling capability.

The utility model discloses a kind of polysulfone granular material washing devices, relate to polysulfone production equipment technical field.Polysulfone granular material washing device, including washing kettle, heat preservation device and washing liquid circulating device, the upper portion of washing kettle is provided with feed inlet, top is provided with eluent outlet, bottom is provided with washing liquid inlet, the lower portion in washing kettle is provided with first perforated plate, upper portion is provided with second perforated plate, second perforated plate can be moved back and forth along the axial direction of washing kettle;Heat preservation device is set on washing kettle;Washing liquid circulating device includes the cooler, solid-liquid separator, washing liquid tank, circulating pump and heater connected in sequence.The technical scheme of the utility model adopts the mode of ethanol countercurrent circulation flow to wash polysulfone granular material in washing kettle, and when washing, limit the polysulfone granular material to be washed between first perforated plate and second perforated plate, can more fully elute diphenyl sulfone on polysulfone granular material, guarantee the washing effect.

The invention belongs to the technical field of high polymer materials, and particularly relates to a proton exchange membrane as well as a preparation method and application thereof, and the preparation method of the proton exchange membrane comprises the step of blending functional resin and an additive to form a membrane, the functional resin comprises one or a combination of perfluorosulfonic acid resin, polybenzimidazole resin, polyether-ether-ketone resin, polyimide resin, polyether sulfone resin and polysulfone resin; the additive is sulfonated MXene; in percentage by mass, the ratio of the functional resin is 80 to 99.9 percent, and the ratio of the additive is 0.1 to 20 percent. The proton exchange membrane prepared by the invention has low ion permeability, high proton conductivity and excellent ion selectivity and mechanical property.

The present invention relates to a hollow fiber membrane comprising at least one polysulfone-based material and at least one polyvinylpyrrolidone-based polymer, characterized in that the porosity of the hollow fiber membrane is from 77.5% to 82% and the sieving coefficient for dextran with a molecular weight of 10,000 g / mol is from 0.42 to 0.75 and the albumin sieving coefficient of the hollow fiber membrane is less than 0.01.

The invention provides a multi-electric-layer nanofiltration membrane for extracting lithium from a salt lake and a preparation method of the multi-electric-layer nanofiltration membrane, and belongs to the technical field of nanofiltration membranes. Firstly, polysulfone and dimethylformamide are put into a mixing kettle, and a membrane casting solution is obtained; coating a non-woven fabric with the membrane casting solution, and then preparing a non-woven fabric and polysulfone combined base membrane through phase inversion; soaking the base membrane in an isopropanol solution, and removing redundant solution on the surface by using a rubber roller; the preparation method comprises the following steps: coating the surface of a base membrane with a solution of a water phase 2, then removing the redundant water phase on the surface, then coating the surface with an oil phase 2, drying a membrane, sequentially and repeatedly coating the membrane with the water phase 2 and the oil phase 2 for multiple times to obtain a nanofiltration membrane with multiple middle layers, then coating the membrane with a solution of a water phase 1, removing the redundant water phase on the surface, then coating the surface with an oil phase 1, and drying to obtain the nanofiltration membrane with multiple electric layers. According to the invention, a plurality of middle layers are positively charged, so that the electrostatic repulsion effect on magnesium ions can be fully exerted, and the magnesium ion interception is obviously improved.

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 low-shrinkage polyester shrink film for labels, which adopts a three-layer co-extrusion structure and comprises an A-layer surface layer, a B-layer core layer and a C-layer bottom layer; the A-layer and the C-layer are arranged on the two sides of the B-layer and are both made of common PETG film; the B-layer is made of PETG shrink film functional master batch chips, hydroxyethyl cellulose and polysulfone; the total weight of the PETG shrink film functional master batch chips, the hydroxyethyl cellulose and the polysulfone is 100 wt%; the adding amount of the PETG shrink film functional master batch chips is 90 wt% to 95 wt%; the adding amount of the hydroxyethyl cellulose is 1 wt% to 3 wt%; and the rest is the polysulfone. The application further discloses a preparation method of the shrink film. After a small amount of hydroxyethyl cellulose and polysulfone are added into the PETG shrink film functional master batch of the core layer, the shrinkage of the shrink film can be obviously reduced, the shrinkage rate is relatively high, and the shrinkage temperature is relatively low; the improved shrink film is especially suitable for being used as a label with low shrinkage; and in post-processing and use, the improved shrink film is beneficial to improving the product yield.

The invention relates to the technical field of membrane materials, in particular to a reverse osmosis membrane, a preparation method and application. The reverse osmosis membrane is prepared by the preparation method. The preparation method comprises the following steps: paving a prepared polysulfone support layer on a carrier containing a water layer, and standing to obtain the water-saturated polysulfone support layer; uniformly coating a water-phase solution on one surface, deviating from the carrier, of the water-absorbing saturated polysulfone supporting layer, then removing the redundant water-phase solution on the polysulfone supporting layer, uniformly coating an oil-phase solution, and then removing the redundant oil-phase solution on the polysulfone supporting layer, so as to obtain the polysulfone carrier. Carrying out interface reaction on the oil phase solution and the water phase solution to obtain a nascent state reverse osmosis membrane containing a polyamide separation layer; and performing post-treatment on the nascent state reverse osmosis membrane to obtain a finished product reverse osmosis membrane. The application refers to the application of the reverse osmosis membrane in seawater desalination. The preparation method can be used for preparing the reverse osmosis membrane with high desalination rate and high water flux.