35 results about "Polymeric membrane" patented technology

This invention belongs to the field of polymer membrane material technology and discloses a method for extracting uranium (UO2) from seawater. 2+ This invention discloses a novel separation membrane material, specifically a amine-oxime-modified polycarbonate membrane, its preparation method, and its applications. The invention uses polycarbonate (PC) as a matrix. First, cyano-modified polycarbonate (PCAN) is prepared by grafting cyano groups. Then, PC and PCAN are blended, and a base membrane material is prepared using a phase inversion method. Finally, through in-situ amine-oxime modification, an amine-oxime-modified polycarbonate membrane (PCAO) is obtained, which possesses advantages such as high adsorption capacity, easy recovery, good stability, and excellent recyclability. Furthermore, the polycarbonate membrane modified with amine-oxime groups exhibits highly efficient selective adsorption capacity for uranium, enabling the effective development of uranium resources in seawater. This not only alleviates the domestic shortage of these key energy materials but also significantly improves economic benefits.

The present application relates to a knitted covered stent, comprising: a support layer and a flow-restricting layer, wherein the support layer is formed from braiding units braided into a hollow cylindrical braided structure, and the flow-restricting layer is formed from braiding units knitted together; the support layer serves as a base scaffold of the stent and provides necessary mechanical support, the flow-restricting layer is a knitted structure covering an exterior of the support layer, wherein the flow-restricting layer uses a knitting process where the braiding units are interlooped and continuously knitted into a mesh covering the exterior of the support layer, and an inner side of the flow-restricting layer is adhered to an outer side of the support layer, resulting in a knitted covered stent comprising a braided structure + a knitted structure; moreover, an interlayer connection structure is provided between the support layer and the flow-restricting layer, so as to achieve interlayer connection and fixation between the support layer and the flow-restricting layer. Compared with conventional laser-cut scaffold + polymer membrane designs, the present application exhibits superior wall apposition and compliance, with better adaptability to vessel morphology and dynamics, thereby improving implantation performance and therapeutic efficacy of stents.

This utility model discloses a hydrogen injection device for a hydrogen refueling station, including a cooling tank. A first connecting pipe and a second pair of connecting pipes are fixedly installed opposite each other on both sides of the cooling tank. A heat exchange pipe is fixed between the first connecting pipe and the second pair of connecting pipes. Multiple filter cartridges are arranged on the side of the cooling tank closest to the first connecting pipe. Each filter cartridge contains a primary filter screen, a secondary ceramic fiber filter element, and a terminal polymer membrane filter element. The filter cartridges closest to the cooling tank are connected to the first connecting pipe, and the multiple filter cartridges are connected to each other via the second connecting pipe. The top of the filter cartridges furthest from the cooling tank is fixed with the first pair of connecting pipes. Through this structure, the cooling tank effectively suppresses temperature rise during refueling, reducing safety risks caused by the easily elevated temperature of hydrogen during refueling. The three-stage filtration module reduces potential damage to components from contaminant particles in the hydrogen fuel, effectively extending the lifespan of critical components.

This invention provides a composite three-dimensional electrode system that does not increase the salinity of the effluent from low-salinity electrolysis, belonging to the field of wastewater treatment technology. It includes a low-salinity electrochemical oxidation device body, an anode plate, a polymer membrane module, and a cathode plate. The low-salinity electrochemical oxidation device body is respectively provided with an inlet and an effluent system. A main reaction zone is located in the middle of the low-salinity electrochemical oxidation device body, and the polymer membrane module is located within the main reaction zone. The anode plate and cathode plate are respectively located at opposite ends of the low-salinity electrochemical oxidation device body, with the anode plate positioned near the inlet and the cathode plate positioned near the effluent system. The polymer membrane module is positioned between the anode plate and the cathode plate. This invention reduces effluent salinity and microbial toxicity by using a conductive reverse osmosis membrane bag to intercept electrolyte salts and oxidizing free radicals.

The application discloses a kind of ion response type high polymer film wrapped active ingredient spinning solution and its preparation method and application, the spinning solution includes the following components: polymer matrix, antioxidant and solvent;The polymer matrix includes sodium alginate and polyvinyl alcohol;The mass ratio of sodium alginate and polyvinyl alcohol is 1: (2.5-5). Sodium alginate in spinning solution has good ion response and biocompatibility, under the action of Ca 2+ , Al 3+ And other metal ions can be quickly crosslinked to form gel film, realize the wrapping of active ingredient;Polyvinyl alcohol has excellent spinning performance and mechanical properties, and can improve the stability of spinning solution and the mechanical strength of fiber by compounding with sodium alginate, avoid the problems such as broken wire and needle blockage in spinning process, suitable for electrospinning process application.

This invention discloses a method for preparing a positively charged nanofiltration membrane using 3D electrostatic spray printing. The method includes the following steps: S1, uniformly mixing a polymeric membrane matrix material, a pore-forming agent, a membrane modifier, and an organic solvent, and preparing a support membrane for the nanofiltration membrane via a phase inversion method; S2, using piperazine and trimesoyl chloride as the aqueous and organic phase monomers, respectively, spraying the monomer solution onto the polymeric support membrane using 3D electrostatic spray printing to prepare a piperazine-trisoyl chloride intermediate layer; S3, using polyethyleneimine and trimesoyl chloride as the aqueous and organic phase monomers, respectively, spraying the monomer solution onto the intermediate layer using 3D electrostatic spray printing to prepare a polyethyleneimine-trisoyl chloride positively charged outer layer. After heat treatment, the positively charged nanofiltration membrane is obtained. This invention provides a simple, precise, and controllable method for preparing a positively charged nanofiltration membrane, which exhibits good selective separation ability for magnesium ions and lithium ions.

A high selectivity and high CO2 plasticization resistant polymer comprises a plurality of repeating units of formula (I) for gas separation applications. The polymer may be synthesized from a superacid catalyzed poly(hydroalkylation) reaction.Membranes made from the polymer and gas separation processes using the membranes made from the polymer are also described.

This invention discloses a low-temperature production process for aluminum composite panels, characterized by the following steps performed in sequence: Plastic granule mixing step: adding plastic raw materials into a mixing device for mixing; granule extrusion step: heating and melting the mixed material through an extruder and extruding it; plasticizing step: plasticizing the extruded molten material; sheeting step: pressing the plasticized material into a plastic substrate; polymer film bonding step: bonding a polymer film to at least one surface of the plastic substrate; high-low temperature aluminum sheet composite step: bonding the substrate treated with the polymer film with aluminum sheets treated with high and low temperatures to form a composite panel; cooling and forming step: cooling the composite panel to set its shape; inspection and coating step: inspecting the cooled and shaped panel for quality and covering its surface with a protective film; trimming and shearing step: trimming and shearing the edges of the inspected and coated panel to a fixed length; finished product unloading step: stacking or packaging the trimmed and sheared finished products to complete the unloading process.

The application provides a cold region tunnel anti-frost heaving structure based on frozen soil replacement, which comprises a frozen soil replacement area arranged outside a tunnel lining, a plurality of sand and stone filler bags are stacked in the frozen soil replacement area, and the sand and stone filler bags are connected into an integral whole through solidified cement-based slurry. The sand and stone filler bag comprises a polymer film bag and concrete stones solidified in the polymer film bag. The application completely blocks the interaction between the soil outside the tunnel lining and external moisture and temperature, and eliminates the core condition (water-ice phase change volume expansion) of frost heaving. The application adopts a broken grading filler system to realize active cutting of capillary water paths, directional reconstruction of pore structures and multi-stage dissipation of frost heaving energy through coupling of particle size breaks and function enhancement, so that the frost heaving rate is significantly reduced, and the application has high permeability and frost resistance and durability, and is particularly suitable for lining invert and side wall backfill areas of railway, highway and water conservancy tunnels which are seriously affected by frost heaving soil.

This invention relates to the field of battery technology, specifically to a composite connector for battery cells and a battery cell. The composite connector for battery cells includes a first structure or a second structure. The first structure includes a laminated composite structure of structure A and a metal layer structure, wherein structure A is selected from at least one of composite metal foil and polymer PTC film. The second structure includes a laminated composite structure of multiple composite metal foils, wherein the composite metal foil includes a polymer film layer and conductive metal layers located on both sides of the polymer film layer. The composite connector is provided with an arrow-shaped fusion structure. The composite connector for battery cells of this invention has high current carrying capacity, utilizing the current "skin effect," its current carrying capacity is 5-6 times that of pure metal of the same size, and it has a thermal safety shutdown function. It also possesses highly flexible physical characteristics, enabling 8C fast charging, no thermal runaway, and an increase in battery cell volumetric energy density of more than 2.5%.

The application discloses an air purification device and a purification method thereof. The air purification device comprises a primary filter layer and at least one secondary filter layer arranged in sequence along a flow path of air flow, and a polymer membrane layer arranged downstream of the at least one secondary filter layer. The secondary filter layer comprises a conductive filter screen cloth and a catalyst laid on the filter screen cloth. The filter screen cloth is electrically connected to a power supply to form a conductive backflow. The application can provide heat for the polymer membrane layer to inactivate microorganisms while catalytically oxidizing volatile organic compounds.

The utility model relates to the field of macromolecular film surface treatment discloses a kind of macromolecular film surface treatment plasma equipment, including processing platform, the top of the processing platform is fixedly connected with equipment support frame, the outer wall of the equipment support frame is fixedly connected with plasma equipment, the inside of the plasma equipment is provided with adjusting mechanism, fixed mechanism is provided on the adjusting mechanism, the top of the processing platform is provided with compacting mechanism, the adjusting mechanism includes feed pipe, the top of the feed pipe is fixedly connected in the bottom of plasma equipment, the bottom of the feed pipe is fixedly connected with storage tube. In the utility model, through the cooperation of electric nozzle, sealing plug and connecting rod, the sealing plug is moved by pulling connecting rod, the closing number of sealing plug to electric nozzle is adjusted, so that macromolecular film of different width is quickly adapted, and the flexible adjustment of plasma treatment liquid spraying range is realized.

The application discloses a preparation method of a crosslinked fluorine-free waterproof and breathable film. The method comprises the following steps: dispersing modified polysiloxane containing active hydrogen groups and paraffin emulsion in deionized water to form a composite dispersion; adding a water-based blocked polyisocyanate crosslinking agent to obtain a pre-reaction coating liquid; centrifugally grading the pre-reaction coating liquid, removing a large-particle unstable phase, and taking the upper uniform dispersion; and coating the upper uniform dispersion on the surface of a porous polymer film substrate and performing heat treatment to form the crosslinked fluorine-free waterproof and breathable film. The water-based process system is adopted, no organic solvent is added in the preparation process, the process is simple, and the obtained film has good waterproofness, breathability and mechanical properties.

The application discloses a high-molecular film composite graphene heating plate and a preparation method thereof, and relates to the technical field of decoration. The heating plate is composed of the following structures from top to bottom: a color aluminum veneer, a high-molecular film, a graphene heating film, a high-molecular film, an aluminum plate, a high-molecular film, a honeycomb core, a high-molecular film and an aluminum plate, and the thickness of each layer has a specific range of values; the high-molecular film is made of modified polyolefin elastomers, modified nano-silica and other raw materials through a multi-step process. The preparation adopts a step-by-step temperature control thermal compounding process, and the product is obtained after flattening, edge trimming, edge sealing and temperature controller installation. The heating plate is prepared by high-temperature compounding of the environment-friendly high-molecular film, is non-toxic and formaldehyde-free, has the functions of heating and decoration, can be adapted to various surface layer styles, has uniform heating, adjustable temperature, firm interlayer combination, no warping and wrinkling problems, and is suitable for wall surfaces, murals and other scenes in houses and offices.

The application belongs to the technical field of polymer film materials, and particularly relates to a bipolar polyether modified polyamide elastomer as well as a preparation method and application thereof. The bipolar polyether modified polyamide elastomer provided by the application comprises alternatingly arranged aliphatic polyamide hard segments and bipolar polyether soft segments, the aliphatic polyamide hard segments and the bipolar polyether soft segments are connected through ester bonds, and the mass fraction of the aliphatic polyamide hard segments in the bipolar polyether modified polyamide elastomer is 30-70%. The bipolar polyether modified polyamide elastomer provided by the application realizes segment polarity difference regulation, micro-phase domain controllable construction and soft / hard segment synergistic effect on a molecular scale by constructing a block structure composed of aliphatic polyamide hard segments and bipolar polyether soft segments, so that a polyamide elastomer film material with high selectivity, high permeability and high stability is obtained, and efficient gas separation and selectivity in CO2 / CH4, CO2 / N2 and other systems can be effectively realized.

This invention discloses a planar interdigitated capacitive humidity sensor with a dual-layer composite membrane structure and its fabrication method. The sensor body includes a substrate, an insulating layer, planar interdigitated electrode pairs, an electrode passivation layer, a humidity-sensitive polymer membrane layer, and a protective membrane layer. The protective membrane layer uses dense Parylene material to construct a nanoscale protective layer, allowing gas molecules to pass freely while effectively blocking dust, aerosols, and salt spray pollutants from direct contact with the core humidity-sensitive membrane, greatly enhancing the sensor's environmental tolerance and long-term stability. Parylene material is hydrophobic with low surface energy. In high-humidity environments, this ultra-thin hydrophobic membrane significantly reduces the adhesion probability and size of microdroplets on the humidity-sensitive membrane surface and possesses a certain self-cleaning ability. This effectively suppresses condensation on the humidity sensor surface and maintains surface cleanliness, enabling the sensor to maintain a good capacitance-humidity linear response relationship in high-humidity environments. This improves the sensor's full-range measurement accuracy, especially in the high-humidity range, and its long-term operational stability in high-humidity environments.

This invention discloses a liquid crystal polymer film for bonding copper foil to achieve an adhesion strength greater than 0.8 kgf / cm. The film has a dielectric loss of less than 0.005 at a frequency of 10 GHz and a relative humidity of 100%, and a coefficient of thermal expansion of 0 to 30 ppm / ℃ at 50–200℃. The liquid crystal polymer film comprises a liquid crystal polymer layer and a polyimide layer. The liquid crystal polymer layer has a dielectric loss of less than 0.005 at a frequency of 10 GHz and a relative humidity of 100%, and a coefficient of thermal expansion of 0 to 30 ppm / ℃ at 50–200℃. The polyimide layer is disposed above and below the liquid crystal polymer layer, and its dielectric loss is less than 0.005 at a frequency of 10 GHz and a relative humidity of 100%.

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.

This invention provides a butyl self-adhesive vapor barrier membrane, its preparation method, and its application, belonging to the field of building materials technology. The butyl self-adhesive vapor barrier membrane comprises, from top to bottom: a first vapor barrier layer, which includes at least one functional layer, at least one polymer film layer, and at least one reinforcing layer; a second vapor barrier layer, which is a butyl pressure-sensitive adhesive layer; and an isolation layer; wherein the butyl pressure-sensitive adhesive layer is formed by curing a butyl pressure-sensitive adhesive comprising butyl rubber, modified bentonite, and molecular sieve activated powder. The butyl self-adhesive vapor barrier membrane exhibits good sealing performance and high reliability at detailed nodes; construction can be carried out simply by tearing off the isolation layer, making it simple to operate, convenient to use, and highly efficient in construction.

The application discloses a time indicating label, which comprises a first layer stack and a second layer stack. The first layer stack comprises a first substrate, a first ink layer and a polymer film layer which are sequentially stacked, and the first ink layer contains a color-changing indicator. The second layer stack comprises a second substrate and a second ink layer arranged on the second substrate, and the second ink layer contains a plasticizer. In the use state, the second ink layer is attached to the polymer film layer, the plasticizer in the second ink layer migrates through the polymer film layer, and the plasticizer contacts and reacts with the color-changing indicator in the first ink layer to cause color change. The thickness or material of the polymer film layer can be adjusted to accurately control the indicating time, and the structure is simple, the cost is low, and the indication is intuitive. The first layer stack and the second layer stack can be arranged in an integrated structure or a split structure, and the split structure is further provided with a release layer to ensure storage stability.

The application discloses a preparation method of a polymer film material based on alpha-cyclodextrin, and the film material is constructed by grafting and modifying the hydroxyl groups of cyclodextrin with three different chain length isocyanates as nucleophilic reagents, so that the film material with a highly branched structure is constructed, the pore structure and hydrophilic / hydrophobic properties of the film material can be accurately adjusted by regulating the difference in the chain length of the isocyanates, the introduction of long chain isocyanate can effectively enhance the hydrophobicity of the film, reduce the penetration of water molecules, and at the same time, improve the selectivity of the film; and the short chain isocyanate is helpful to improve the porosity of the film and enhance the permeability of ethylene glycol. The performance of the film is regulated by the branched structure, the problems of poor selectivity and poor stability of the traditional film material are solved, the separation efficiency, the anti-pollution property and the long-term stability are significantly improved, and the application prospect of the film in industrialization is excellent.

The present invention concerns a method for producing porous polymeric membranes (M), comprising a step of solubilizing at least one polymer in a solvent to obtain a polymeric solution; a step of applying the polymeric solution in the form of a polymeric film (16, 116) on a substrate (15, 115); and a step of putting the polymeric film (16, 116) in contact with at least one antisolvent. The invention also concerns an apparatus configured to implement this method.

The invention provides polymeric membranes with a mixed matrix and hollow fibers, with high mechanical resistance, useful in high pressure gas permeation processes such as, in particular, the removal of CO2 from raw streams resulting from oil exploration. The membranes are formed by at least one polymeric layer consisting of at least one polymer and an inorganic filler of clay mineral nanoparticles. The respective co-extrusion processes applicable to the production of said membranes are also provided herein.

Described are ligand-modified porous membranes that include a porous polymeric membrane having a ligand-modified surface, the ligand-modified surface having a hydrogen bond-acceptor group-containing ligand, a hydrogen bond-donor group-containing ligand, or both of these; methods of making the ligand-modified porous membrane; and method of using the ligand-modified porous membrane to filter a photoresist solution and remove unwanted polymer molecules from the photoresist solution.

This invention relates to the field of polymer membrane separation technology, and in particular to a method for preparing and applying a cross-linked hollow fiber membrane. The preparation method includes the following steps: mixing a diamine monomer and a dianhydride monomer to prepare polyamic acid, followed by dehydration to prepare polyimide; grafting the polyimide with a diol to obtain graft-modified polyimide; fabricating a hollow fiber membrane from the graft-modified polyimide; and immersing the hollow fiber membrane in an acyl chloride solution for interfacial cross-linking to obtain a cross-linked hollow fiber membrane. This invention utilizes a ternary synergistic strategy of "side-branching-in-situ esterification-interfacial cross-linking" to construct a flexible covalent network between polyimide molecular chains. Excess diol is used to pre-esterify the carboxyl groups on the benzene ring of AHPBA, obtaining flexible hydroxyl reaction sites. Subsequently, acyl chloride is used to cross-link the flexible hydroxyl reaction sites and phenolic hydroxyl groups grafted onto the benzene ring of AHPBA, resulting in a synergistic chemical structure.

This invention relates to the field of waterproof membrane technology, and proposes a three-layer polymer self-adhesive pre-laid waterproof membrane and its preparation method. The three-layer polymer self-adhesive pre-laid waterproof membrane, from top to bottom, comprises a protective layer, adhesive layer I, polymer film layer I, adhesive layer II, polymer film layer II, adhesive layer III, polymer film layer III, a self-adhesive layer, and a release layer. At least one of adhesive layer I, adhesive layer II, adhesive layer III, and the self-adhesive layer includes the following components: styrene-butadiene-styrene block copolymer, asphalt, carboxylated styrene-butadiene rubber, tetraneedle-shaped zinc oxide whiskers I and II, and additives. Tetraneedle-shaped zinc oxide whisker I is a compound modifying tetraneedle-shaped zinc oxide whisker with phenyl and epoxy groups in its molecular structure, and tetraneedle-shaped zinc oxide whisker II is an aminosiloxane modified tetraneedle-shaped zinc oxide whisker. This technical solution solves the problem of poor puncture resistance in pre-laid waterproof membranes in related technologies.

Membranes permeable to an analyte may overlay the active sensing region of a sensor to limit the analyte flux and improve the response linearity of the sensor. Temperature variation of the analyte permeability can be problematic in some instances. Polymeric membrane compositions having limited variation in analyte permeability as a function of temperature may comprise: a polymer backbone comprising one or more side chains that comprise a heterocycle; and an amine-free polyether arm appended, via an alkyl spacer or a hydroxy-functionalized alkyl spacer, to the heterocycle of at least a portion of the one or more side chains.

This application relates to a magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank, comprising a feed pipe, a gravity settling assembly, a magnetic adsorption assembly, and a polymer membrane separation tube. The feed pipe is connected to the feed end of the gravity settling assembly. The magnetic adsorption assembly includes a cross-shaped adapter, a circular tube, an electrically controlled magnetic generator, an electromagnetic rod, a circular positioning plate, a cylindrical sealing plug, a servo motor, and a magnetic debris collection bin. The cross-shaped adapter is connected to the gravity settling assembly and the polymer membrane separation tube. Corresponding circular tubes are connected to both sides of the cross-shaped adapter. The servo motor is installed on one side of the cross-shaped adapter, and the electromagnetic rod is inserted into the circular tube. The end of the electromagnetic rod away from the servo motor is equipped with an electrically controlled magnetic generator. This application uses the electrically controlled magnetic generator, electromagnetic rod, and other components to enable the electromagnetic rod to generate magnetic force, thereby adsorbing magnetic particles in the feed material to effectively remove magnetic particles from the vinylidene fluoride monomer gaseous raw material.

The application belongs to the field of intelligent indication packaging of food, and particularly relates to a preparation method and application of a fluorescent ratio type meat freshness indication film. The application synthesizes double-emission carbon quantum dots through a one-step hydrothermal method, and then fixes the carbon quantum dots in a hydrophobic polymer film through an electrospinning method to prepare a portable indication label with high stability; the indication label responds to volatile biogenic amines, and can further monitor the freshness of chilled meat. The electrospinning film forming technology of the application obtains nanoscale fibers, which have a larger specific surface area and higher porosity than traditional films, and can uniformly fix the carbon dots in the fibers, and are more sensitive to gas; and the operation method and process are simple, the raw material cost is low, the raw material is easy to obtain and easy to realize industrialized production, and the application prospect is wide.

The utility model relates to a pressure temperature sensor, electronic skin, robot, wherein the bottom surface of piezoelectric film sets pressure measurement electrode, sets common electrode between piezoelectric film top surface and macromolecular film bottom surface, and pressure measurement electrode and common electrode are output electrode of piezoelectric signal of piezoelectric film, macromolecular film is the insulating polymer of pressure deformation amount within 2 ‰, dielectric constant changes with temperature, top surface sets temperature measurement electrode, and temperature measurement electrode and common electrode form direct physical contact to corresponding surface of macromolecular film respectively, form the electric capacity sensing, common electrode is as ground electrode, or piezoelectric film and macromolecular film work periodically and time-sharing through the first gate switch, and processing module couples piezoelectric measurement branch, capacitance digital conversion circuit, is used for outputting pressure information according to piezoelectric signal of piezoelectric measurement branch and outputting temperature information according to capacitance signal of capacitance digital conversion circuit.