487 results about "Polymeric membrane" patented technology

The invention relates to the technical field of polymeric membrane materials, and particularly discloses an antistatic polyethylene composite membrane and a preparation method thereof. Comprising the following raw materials in parts by weight: 100 parts of low-density polyethylene, 5-9 parts of high-density polyethylene, 10-20 parts of maleic anhydride grafted polyethylene, 8-15 parts of a polyvinyl alcohol modified material, 3-5 parts of antistatic modified carbon black, 0.5-1 part of an antioxidant and 1-2 parts of a dispersing agent, the polyethylene composite film has excellent dispersibility, can effectively enhance the mechanical properties of the polyethylene composite film through the synergistic effect of physical filling and chemical grafting, forms a layer of conductive network structure, namely a conductive film, on the surface of the material through the combined effect of the polyethylene composite film and the antistatic agent, prevents the generation and accumulation of static electricity, and has good compatibility among the raw materials. And the material has excellent mechanical property and antistatic property.

The invention belongs to the technical field of polymeric membrane materials, and particularly discloses a polycarbonate / cellulose acetate blended ultrafiltration membrane as well as a preparation method and application thereof. The polycarbonate / cellulose acetate blended ultrafiltration membrane is prepared by blending cellulose acetate and polycarbonate, and has the advantages of simple preparation method, low cost, low energy consumption, good stability and the like; meanwhile, the double advantages of polycarbonate and cellulose acetate are combined, remarkable hydrophilic enhancement and efficient permeability are shown, the purpose of separation and purification can be achieved, and the composite material has huge potential application prospects in the fields of seawater desalination, sewage treatment, rainwater collection and treatment and the like.

The invention belongs to the field of polymeric membranes. The invention relates to a BOPLA (biaxially-oriented polylactic acid) film with high stretching ratio and a preparation method thereof. The packaging film comprises the following raw materials in parts by weight: 80-90 parts of PLA; 10 to 20 parts of PPC-P (Polypropylene Chloride-P); 10-15 parts of a plasticizer; 3.0 to 5.0 parts of a chain extender; 0.3 to 0.5 part of an antioxidant; 0.5 to 1.0 part of a lubricant; 0.1 to 0.3 part of an anti-hydrolysis agent; wherein the total mass of the PLA and the PPC-P is 100 parts; the preparation method comprises the following steps: mixing, extruding and plasticizing the raw materials according to the formula, and carrying out an asynchronous two-way stretching process, heat setting, traction, slitting and rolling. According to the present invention, the defects of mechanical property degradation and poor optical property of the PLA under the high stretching rate in the prior art can be effectively solved, and the great application potential is provided.

The invention relates to the technical field of building waterproof materials, and provides a multi-layer self-protection self-adhesion waterproof roll and a preparation method thereof. The multi-layer self-protection self-adhesion waterproof roll sequentially comprises an isolating membrane, a self-adhesion glue layer, an elastic polyester felt buffer layer, an adhesive layer and a polymeric membrane layer from top to bottom, and the self-adhesion glue layer is prepared from, by weight, 65-75 parts of butyl rubber, 15-20 parts of SBS modifier, 8-12 parts of tackifying resin I, 0.5-1.5 parts of anti-aging agent, 8-15 parts of filler, 1-3 parts of polyethylene and 1-2 parts of flexibilizer. The tackifying resin I comprises rosin resin. According to the technical scheme, the problems that the self-adhesive waterproof roll does not have the self-protection capability, the peel strength is low and the holding power is poor in the prior art are solved.

The invention discloses an amphiphilic chitosan and plant nanocellulose composite coating fresh-keeping material, which is prepared from the following ingredients in percentage by mass: 0.5 to 20 percent of amphiphilic chitosan, 0.1 to 5.0 percent of plant nanocellulose, 0.5 to 10.0 percent of coalescing agents, 0.1 to 3.0 percent of antioxidants and the balance deionized water. Wherein the amphiphilic chitosan is prepared from chitosan, quaternary phosphonium salt and sorbic acid. Amphipathic chitosan of the material has hydrophilic groups such as amino and carboxyl and a sorbate hydrophobic group, has hydrophilicity and hydrophobicity at the same time, and is extremely easy to combine with substances such as a coalescing agent, plant nanocellulose and an antioxidant to form a stable polymeric membrane layer, so that the mechanical property after membrane formation is remarkably improved, and the material has a good application prospect. Meanwhile, the plant nanocellulose particles can be stably coated in the polymeric membrane material layer, so that the mechanical property of the material is enhanced, and lasting and efficient antibacterial and antioxidant effects are realized. The invention further discloses a preparation method and application of the amphiphilic chitosan and plant nanocellulose composite coating fresh-keeping material.

The invention discloses a bipolar current collector and a preparation method thereof, a bipolar electrode and a battery, the bipolar current collector comprises a base film layer, an aluminum layer is arranged on the surface of one side of the base film layer, and a copper layer is arranged on the surface of the other side of the base film layer; the base film layer comprises a middle polymeric film layer and ceramic layers on the surfaces of the two sides of the polymeric film layer; miniature channels for lithium ions to pass through are distributed on the bipolar current collector along the thickness direction, and the miniature channels penetrate through the aluminum layer, the base film layer and the copper layer. A diaphragm in a traditional bipolar electrode is omitted, so that the volume energy density in the battery is remarkably improved, lithium ions in the battery can have diffusion channels in multiple directions, the internal resistance of the battery is reduced, and the rate capability is improved. According to the invention, a diaphragm lamination process is omitted, the production efficiency can be improved, and meanwhile, the risk of short circuit at the edges of the positive and negative active material layers caused by alignment errors of the lamination process is avoided.

The invention relates to the technical field of protective films, and particularly discloses a composite glass protective paste for a flexible folding screen and a preparation method of the composite glass protective paste. The composite glass protection paste for the flexible folding screen sequentially comprises a functional base film, a first thermosetting polymer film, a UTG ultrathin glass layer, a second thermosetting polymer film and an OCA adhesive layer from top to bottom, the preparation method of the OCA adhesive layer comprises the following steps: carrying out activating treatment on nano silicon dioxide particles to obtain modified particles with cations on the surfaces; carrying out reaction on the modified particles and molten hydroxy acrylic resin under the ultrasonic action, and carrying out extrusion granulation to obtain elastic acrylic master batches; uniformly mixing the elastic acrylic master batch with a cross-linking agent and a photoinitiator to obtain the acrylic OCA; and coating OCA on one surface of the release film, and performing ultraviolet curing to obtain an OCA layer. According to the composite glass protection paste for the flexible folding screen, the bending resistance of the protection paste is improved.

The invention relates to an antistatic plastic film and a preparation method thereof, and belongs to the technical field of polymeric membrane materials, the antistatic plastic film is composed of a PET base film and an antistatic coating formed by curing an antistatic coating, the antistatic coating comprises the following components in parts by weight: 100 parts of organic silicon resin, 12-18 parts of an antistatic agent, 0.8-1.1 parts of a dispersing agent, 0.4-0.6 part of a bridging agent, 0.15-0.2 part of a flatting agent and 55-60 parts of a solvent, according to the antistatic agent, lamellar graphene is used as an electrostatic charge release matrix, a silane coupling agent KH-550 is used for introducing amino to the surface of a lamellar layer for modification, methyl chloroacetate and the amino grafted to the lamellar layer are used for substitution, finally, methyl iodide and a substituted amine compound are subjected to quaternization reaction, quaternary ammonium cations are introduced to the surface of the graphene lamellar layer, and the antistatic agent is obtained. And a continuous current collecting layer is formed in the coating, so that the generated electrostatic charge is timely led out, and the film material is endowed with excellent antistatic property.

The invention relates to the field of nanopore sequencing, and particularly discloses a nanopore sequencing polymeric membrane and a membrane forming method.The polymeric membrane is a single-layer molecular membrane and is formed by a block polymer, the block polymer comprises a hydrophilic-end polymer and a hydrophobic-end polymer, the polymerization degree of the hydrophilic-end polymer is 4-6, and the hydrophobic-end polymer is 2-6. The polymerization degree of the hydrophobic end polymer is between 18 and 33; the preparation method of the polymeric membrane comprises the following steps: S1, adding a first buffer solution into a microstructure of a chip, introducing a non-polar solvent dissolved with a block polymer into a runner of the microstructure, and pushing away the redundant first buffer solution to form a lower interface of the polymeric membrane; s2, introducing gas into the microstructure to push away the redundant non-polar solvent to form an upper interface of the polymeric membrane; and S3, adding a second buffer solution, emptying upper-layer gas, and forming a polymeric membrane on the surface of the microstructure of the chip after the block polymer is stably arranged. The film forming process provided by the invention is easy to operate in film forming, low in film rupture rate, and relatively good in stability and voltage tolerance.

The invention relates to the field of bimetal composite boards, and discloses a fireproof bimetal composite board and a preparation method thereof.The preparation method comprises the following steps that an aluminum board is selected as a base layer, the upper surface of the aluminum board is coated with a polymeric membrane to form a bonding layer, the upper surface of the bonding layer is coated with a copper board, and the fireproof bimetal composite board is prepared through compounding at the temperature of 150-200 DEG C; the polymeric membrane comprises an ethylene-vinyl acetate copolymer, epoxy resin, polymethyl methacrylate, modified polyglycidyl methacrylate, a composite filler and polyamide. The bimetallic composite plate prepared by the invention is prepared by coating the copper plate with the polymeric membrane on the aluminum plate; the composite filler and the modified polyglycidyl methacrylate are added into the polymeric membrane, so that the peel strength and the mechanical property of the polymeric membrane are improved, and the polymeric membrane is excellent in oxidation resistance and corrosion resistance and high in flame retardant property and fireproof grade.

The invention relates to a film-forming filtrate reducer and a preparation method thereof, workover fluid and a workover method, and relates to the field of workover, the film-forming filtrate reducer comprises an oil phase, an emulsifier, acrylamide, N-vinyl pyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid, hexadecyl dimethyl allyl ammonium chloride, water and an initiator; the workover fluid comprises water, a tackifier, a plugging agent, an acid-soluble temporary plugging agent, an interface modifier, a corrosion inhibitor, a weighting agent and the film-forming filtrate reducer. According to the film-forming filtrate reducer provided by the invention, specific acrylamide, N-vinyl pyrrolidone, acrylamido-2-methylpropanesulfonic acid and hexadecyl dimethyl allyl ammonium chloride are subjected to reverse emulsion polymerization to obtain a polymer, and the polymer is greatly adsorbed on the surface of a filter cake under the action of high temperature and high pressure to form a high-toughness polymeric film; the filter loss is reduced; the temperature resistance of the workover fluid is larger than or equal to 180 DEG C, the pressure-bearing plugging capacity of the workover fluid to a crack core is larger than 10 MPa, and the permeability recovery value is larger than or equal to 92%.

The invention relates to the technical field of waterproof coiled materials, and provides a tensile double-lap-joint polymeric membrane base waterproof coiled material which sequentially comprises a first isolating membrane, a first permeable reaction adhesive layer, a first polymeric membrane base layer, a second permeable reaction adhesive layer, a second polymeric membrane base layer, a third permeable reaction adhesive layer and a surface layer from bottom to top, the surface layer is formed by connecting a second isolating membrane and an anti-sticking layer; a first lapping opening and a second lapping opening are formed in the two sides of the second permeable reaction adhesive layer respectively, the second isolating membrane and the first lapping opening are located on the two sides of the anti-sticking layer respectively, a third isolating membrane and a fourth isolating membrane are arranged on the inner wall of the first lapping opening, and a fifth isolating membrane and a sixth isolating membrane are arranged on the inner wall of the second lapping opening. Through the technical scheme, the problems of low peeling strength and poor adhesiveness of the overlapping edge of the waterproof roll in the related technology are further improved and solved.

The invention relates to the technical field of filtering materials, and discloses a preparation method of a low-leakage-point filtering framework convenient for membrane compositing and a filter element of a filter.According to the method, polypropylene is used as a raw material to prepare the filtering framework through a spunbond method, the filtering framework comprises a supporting layer and a composite layer, and the fiber diameter of the supporting layer is larger than that of the composite layer; the supporting layer is used as a supporting framework to improve the stiffness and strength of the filtering layer, the composite layer is used for being compounded with the polymeric membrane, the fiber diameter of the composite layer is smaller than that of the supporting layer, and the flatness uniformity of the filtering layer compounded with the polymeric membrane is improved; the combination firmness of the filter layer and the filter framework is improved through the gradually-changed filter framework structure, and the leakage points of the filter layer are reduced.

The invention provides a method for preparing a degradable bone-guided regeneration membrane with an asymmetric membrane layer, which comprises the following steps of: cutting a magnesium metal sheet into a magnesium net or a magnesium bracket with small holes by laser, carrying out heat treatment on the magnesium net or the magnesium bracket by using HF (Hydrogen Fluoride) to obtain a layer of MgF4 coating on the surface, and immersing the magnesium net or the magnesium bracket into a macromolecular solution until a solvent of the macromolecular coating is completely volatilized; then preparing an electrostatic spinning membrane on the surface of the sample: preparing a dense polymer membrane layer containing an antibacterial drug on the surface of the sample close to one side of the fiber tissue by adopting a hot pressing method, or preparing a dense electrostatic spinning ordered fiber membrane which contains an antibacterial nano-drug and is arranged in parallel by adopting an electrostatic spinning method; the designed structure and the used materials can realize an antibacterial function and shield fiber tissues from growing in. The nanofiber membrane which contains osteogenesis promoting substances such as nano-hydroxyapatite or nano-strontium and is conveyed disorderly is prepared on the side close to the bone tissue by adopting an electrostatic spinning technology, and the designed structure and the contained substances can promote osteogenesis.

This disclosure relates to polymers and polymeric membranes that incorporate functionalized copoly(1,2,4-triazole)s. The polymers and polymeric membranes can be used in sour natural gas separation applications.

The invention discloses a method for preparing low-grafted glucosyl stevioside at high temperature and high pressure, which comprises the following steps: taking stevioside as a receptor, beta-cyclodextrin as a donor and CGT enzyme as a catalyst for reaction to obtain reaction liquid containing glucosyl stevioside; putting the reaction liquid containing the glucosyl stevioside into a high-pressure reaction kettle, and adding a catalyst to carry out high-temperature and high-pressure cracking reaction; after the high-temperature and high-pressure cracking reaction is finished, cooling a cracking solution to room temperature, filtering, concentrating for multiple times by adopting a polymeric membrane, and collecting a trapped fluid; and carrying out spray drying on the trapped fluid to obtain the low-grafting glucosyl stevioside. According to the method, firstly, glucosyl stevioside is prepared by adopting an enzyme modification method, then splitting decomposition is performed under certain conditions, and then a specific purification process is performed, so that the prepared product is high in stability, the proportion of low-grafted glucosyl stevioside in the product is high, and the product tastes good.

The invention relates to the technical field of membrane separation, in particular to an MOFs mixed matrix membrane for nitrogen-oxygen separation and a preparation method of the MOFs mixed matrix membrane. The preparation method comprises the following steps: by taking high polymers such as PI, PSF and PIM-1 as film forming materials, embedding a metal organic framework (MOF) material with an affinity effect on oxygen into a polymer film matrix by adopting an in-situ growth method. The nitrogen-oxygen separation mixed matrix membrane is prepared through an in-situ growth MOF method, the method does not need to prepare MOFs firstly and then disperse MOFs particles, the agglomeration phenomenon caused by non-uniform dispersion is avoided, the gas separation performance of the composite membrane can be regulated and controlled by increasing the growth period of MOFs, the permeability of oxygen and the selectivity of oxygen / nitrogen are improved, and the nitrogen-oxygen separation effect is improved. Clean oxygen-enriched air with the oxygen content being 50% or above can be stably produced, and cost and energy consumption are reduced.

The invention discloses a multi-layer polymeric membrane functional current collector and a preparation method thereof, a pole piece and a battery, and the preparation process comprises the following steps: S1, blending and granulating ultra-high molecular weight polyethylene and high density polyethylene to prepare a composite layer raw material; s2, adding the composite layer raw material and the middle layer nylon raw material into a screw extruder, and carrying out co-extrusion casting to form a composite layer-middle layer-composite layer three-layer structure film; s3, carrying out plasma activation treatment on the obtained three-layer structure film; s4, forming nanoscale pits in the outer surface of the three-layer structure film by dipping the three-layer structure film in the treating fluid; and S5, preparing a metal layer on the outer side of the three-layer structure film to obtain the multi-layer polymer film functional current collector. Through material blending optimization, multi-layer structure design and surface functionalization treatment, the mechanical property and dimensional stability of the current collector base film and the binding force between the current collector base film and a metal coating are remarkably improved.

The invention discloses a high-performance Mg < 2 + > / Li < + > separation nanofiltration membrane and a preparation method thereof, the Mg < 2 + > / Li < + > separation nanofiltration membrane is a polymer composite membrane, and is composed of a surface separation layer and a support layer; the surface separation layer is formed by self-assembling a polycation electrolyte and a polyanion electrolyte layer by layer, the supporting layer is formed by ultraviolet grafting of any one or two of sodium polystyrene sulfonate, polymethylacrylic acid 3-sulfonic acid propyl ester potassium salt and polyacrylic acid on the surface of a hydrophobic polymeric membrane, and the surface of the supporting layer is negatively charged. The negative charge amount of the supporting layer is gradually reduced from top to bottom; the whole separation membrane has the characteristics that the upper layer is hydrophilic and the lower layer is hydrophobic. By adjusting the charge density and aperture of the supporting layer, the structure of the surface separation layer is influenced, the charge repulsion effect, aperture screening effect and built-in electric field intensity of the whole membrane are enhanced, and the Mg < 2 + > / Li < + > separation factor is increased. Permeation and rapid transportation of water are promoted by virtue of a hydrophilic upper-layer and hydrophobic lower-layer structure, and the membrane flux is improved; the preparation process is simple, and the used solvent is water, so that the method is green and environment-friendly and has a good application prospect.

The present invention discloses a method for batch preparation of graphene electron microscope grids. The present invention realizes high-quality batch transfer of graphene and electron microscope grids by designing a multi-level transfer medium (including a PDMS porous template, a polymer support layer and a small molecule buffer layer) in combination with a solvent volatilization-induced elastic capillary bonding process. Specifically, the surface of the graphene is uniformly coated with a small molecule / polymer transfer medium layer, and then bonded to the PDMS porous array template. After the graphene is peeled off from the growth substrate, the graphene supported by the polymer film in the suspended part of the PDMS is bonded to the electron microscope grid using a solvent thermal bonding method; finally, the transfer medium is removed to obtain the graphene grid. The method of the present invention has the advantages of simple process, reusable PDMS template and good compatibility, and is suitable for large-scale production. At the same time, the prepared graphene grid has high cleanliness and integrity, and can meet the application requirements in the field of cryo-electron microscope grids.

The invention relates to the technical field of waterproof coiled materials, and provides an anti-aging film for a waterproof coiled material and a preparation method thereof.The anti-aging film is formed by crossing and compounding multiple layers of films, and the multiple layers of films sequentially comprise an inner layer film, a middle layer film and an outer layer film from top to bottom; wherein the outer-layer film comprises the following components in parts by weight: 80-90 parts of high-density polyethylene, 6-8 parts of black masterbatch, 10-15 parts of hydroxyl nicotinic acid compound modified carbon black, 1-2 parts of an antioxidant and 2-4 parts of a plasticizer, the modified carbon black is hydroxyl nicotinic acid compound modified carbon black, and the inner-layer film and the middle-layer film are polymer film layers. According to the technical scheme, the problem that in the prior art, the aging resistance of the film for the waterproof roll is poor is solved.

The invention discloses a high-durability waterborne polyurethane fluoride-free waterproof finishing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: adding dihydroxyl-terminated silicone oil into a reactor, and carrying out high-temperature vacuumizing dehydration treatment; when the temperature of the reactor is reduced to a proper temperature, adding isophorone diisocyanate for reaction to obtain a polyurethane prepolymer; adding glycerin monostearate into the reactor for chain extension; adding a proper amount of hydrophilic chain extender into the reactor for chain extension; and adjusting the pH value, and adding water at room temperature to emulsify uniformly to obtain the high-durability waterborne polyurethane fluoride-free waterproof finishing agent. After the textile waterproof agent is applied to a textile, a layer of high-strength, flexible and wear-resistant polymeric membrane can be formed on the surface of the textile, the waterproof performance of the textile is effectively improved, meanwhile, the textile waterproof agent has good air permeability and flexibility, and the hand feeling of the textile is effectively improved. And the waterproof contact angle after multiple times of washing is slightly different from that before washing, the durability is good, and the service life is long.

Polymeric porous membranes, filter containing, and methods of making the polymeric membranes the same are disclosed. The polymeric porous membrane has a first major membrane surface and a second major membrane surface opposite of the first major membrane surface, and a first layer proximate the first major membrane surface, the first layer including a first plurality of pores having a first average pore size. The membrane includes a second layer comprising a second plurality of pores having a second pore size. In some cases, the membrane includes a third layer comprising a third plurality of pores having a third pore size.

The invention relates to the field of membrane material preparation, in particular to an amino acid derivative polymer membrane material and a preparation method thereof. The preparation method provided by the invention comprises the following steps: S1, preparing a polymer solution; S2, forming and depositing a membrane; S3, carrying out surface modification on the membrane; and S4, carrying out crosslinking treatment. The functional polymer membrane material is synthesized through the amino acid derivative, selective separation of specific ions or molecules can be achieved, and good biocompatibility, stability and application prospects are achieved. The technology can be widely applied to multiple fields of biological separation, environment purification, drug delivery and the like, and has remarkable innovativeness and practical value.

The present disclosure relates to the technical field of film material, and particularly to a polymeric polyphenol-modified polymer film, a preparation method thereof and a metallized polymer film. According to the present disclosure, corona treatment is performed to a surface of a polymer layer, so that a polar modifying liquid can uniformly coat the surface of the polymer layer, thereby forming a modification layer tightly combined with the polymer layer. Thus, the low-polarity polymer layer surface can be imparted with a durable high polarity. Consequently, the polymer layer is capable of being stably and tightly bonded to a material layer with high polarity and high surface tension, such as a metal layer, for a long period of time, effectively broadening the application scenarios for non-polar polymer substrate layers. By controlling the concentrations of the polyphenolic compound and the cross-linking agent in the modifying liquid, the modification layer formed by a cross-linking reaction can have a suitable cross-linking density and an adequate number of hydroxyl groups, thereby further effectively and stably enhancing the long-term polarity and surface tension of the polymer layer. The preparation method is simple and easy to operate, cost-effective, efficient, and easy to scale up.

The invention discloses preparation and application of light-weight and low-cost humanoid robot skin, and belongs to the field of application of humanoid robot surface materials. Comprising the following steps that S1, waterborne polyurethane slurry is sprayed to an inner mold body of a mold A and an inner mold body of a mold B correspondingly, and drying is conducted; foaming type polyurethane resin is injected into the mold A, demolding is conducted after the foaming type polyurethane resin is completely foamed and cured at the normal temperature, and a polyurethane foaming body is obtained; s2, a platinum silica gel catalyst is sprayed on the polyurethane foaming body and the mold B; s3, a polyurethane foaming body is fixed into the mold B; injecting the mixed silica gel into a gap of the mold B; curing and demolding; and S4, after demolding, carrying out surface hand feeling treatment by using skin feeling water-based slurry, and drying to obtain the light-weight and low-cost humanoid robot skin. The polyurethane forms a compact polymeric membrane after being dried, so that the problem of oil leakage on the surface of the silica gel is effectively solved, and the surface wear resistance, scratch resistance and light aging resistance are remarkably improved.

The present invention relates to a medical device manufactured using the additive manufacturing process (3D printing). It is a medical device used preferably as a bone graft composed of a porous structure based on bioceramics based on β-tricalcium phosphate (β-TCP) or hydroxyapatite, which may or not contain nanostructures in its composition, for example: carbon nanostructures (graphene, graphene oxide, reduced graphene oxide, carbon nanotubes, etc.) and, in preferred embodiments, stem cells and polymeric membrane. Also, the present invention relates to the use of this device as a bone graft and the process of preparing this device.

The invention discloses a porous catalytic membrane, a membrane electrode assembly and a water electrolysis device, and relates to the technical field of new energy. The porous catalytic membrane provided by the invention comprises a porous polymeric membrane formed by interweaving randomly arranged nanofibers, and a catalyst covering the surfaces of the nanofibers, the porous polymeric membrane has a self-supporting structure and a large specific surface area, and provides a large number of loading sites for the catalyst; the catalyst can be directly anchored on the nanofiber of the porous polymeric membrane through a physical or chemical preparation method, uniform dispersion is realized, and no ionomer is needed for coating, so that the problems of high cost and performance reduction caused by use of the ionomer are avoided, the exposure degree of catalytic active sites is remarkably improved, and the catalytic activity of the catalyst is improved. Therefore, the utilization efficiency of the catalyst is improved and the dosage of the noble metal catalyst can be reduced; in addition, the porous catalytic membrane and the ion exchange membrane have excellent interface contact characteristics, and integrated combination of the porous catalytic membrane and the ion exchange membrane is facilitated.

The invention relates to the technical field of polymeric membrane materials, in particular to a functional packaging membrane material and a preparation method thereof. The packaging film material is prepared from PET, PLA, a modifier and an ultraviolet absorbent, wherein the modifier is formed by grafting dimethyl terephthalate, ethylene glycol and dihydroxyl-terminated polylactic acid to the surface of carboxylated graphene after ester exchange. Under the synergistic effect of the carboxylated graphene nanosheets and the modifier, the uniform dispersion and interface bonding strength of the nanofiller are effectively improved, so that the compatibility of PET (Polyethylene Terephthalate) and PLA (Polylactic Acid) is optimized. According to the structural design, the comprehensive performance such as tensile strength, toughness, gas barrier property and thermal deformation temperature of the composite material can be remarkably improved, and meanwhile, good processability and degradability of the material are guaranteed. The invention provides reliable technical support for developing a novel green packaging film material with high performance and low environmental burden, and has wide industrial application prospect.

The present invention refers to processes for the preparation of polymeric membranes, which can be nanostructured hybrids, containing ionic liquids and their derivatives for sequestration of CO2 from natural gas by gaseous permeation, and its referred membranes. The membranes of the present invention can be dense flat membranes, or composite asymmetric flat membranes. The invention can be applied in oil and gas extraction and renewable energies, for example, in existing gas treatment plants on off-shore platforms, replacing existing conventional polymeric membranes, as well as in new gas treatment plant designs that use polymeric membranes as natural gas purification technology, or treatment of exhausted gas streams.