334 results about "Polymeric membrane" patented technology

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 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 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.

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 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.

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 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 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 invention provides a polymer composition, a polymer film material, a holographic grating, a preparation method of the holographic grating, an optical film material and display equipment. The polymer composition comprises a first polymerizable monomer, a second polymerizable monomer and a film-forming resin. The first polymerizable monomer is a non-liquid crystal monomer; the second polymerizable monomer is a liquid crystal monomer, the second polymerizable monomer comprises an active group, and the second polymerizable monomer can be subjected to a copolymerization reaction with the first polymerizable monomer through the active group under illumination. The refractive index modulation degree of the optical film material can be improved by using the polymer composition.

The invention discloses a wear-resistant and fibrillating-resistant spun silk fiber and a preparation process and application thereof, a layer of smooth and continuous amino acid-containing polymeric membrane protective layer with uniform thickness is formed on the surface of the spun silk fiber, the thickness of the polymeric membrane protective layer is 50-500nm, and the thickness of the polymeric membrane protective layer is 50-500nm. The polymeric membrane protective layer enables the spun silk fibers to be wear-resistant and anti-fibrillating, the spun silk fibers are not easy to damage after being treated by dyeing and after-finishing processes, and the prepared fabric can still keep good hand feeling and color after being washed for multiple times. Besides, the preparation process is simple, efficient and wide in applicability, and the prepared wear-resistant and fibrillating-resistant spun silk fiber can be used for spinning and weaving independently or together with other fibers and can be applied to the fields of clothes, underwear, home textiles, filling and the like.

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 invention belongs to the technical field of polymeric membrane composite glass, and discloses a preparation method and application of polymeric membrane composite glass, the polymeric membrane composite glass comprises a first glass layer, a second glass layer and an EVA composite membrane located between the two glass layers, the EVA composite membrane contains nano metal oxide particles, and the nano metal oxide particles contain nano metal oxide particles. The nano metal oxide particles comprise cerium oxide, tungsten oxide, titanium oxide and yttrium oxide. The middle layer of the EVA composite film of the polymeric film composite glass additionally comprises nano metal oxide particles, tungsten oxide absorbs near-infrared heat radiation, titanium oxide reflects infrared light, cerium oxide and yttrium oxide can absorb ultraviolet light, and the heat insulation performance is excellent; according to the present invention, with the nano-metal oxide particles, the tungsten oxide, the tin oxide and other nano-oxide particles, the elastic modulus, the density and the viscosity of the EVA are increased, the sound wave conduction path is effectively blocked, the sound insulation and noise reduction performance is excellent, the nano-metal oxide particles can improve the interface bonding strength of the EVA composite film and the glass layer, and the safety performance is high.

The utility model provides a monofilament diaphragm composite screen cloth structure. The monofilament diaphragm composite screen cloth structure comprises a first-material screen cloth and a second-material screen cloth, the second material monofilament membrane comprises a plurality of yarns and a polymeric membrane layer, the yarns are arranged in the polymeric membrane layer, the polymeric membrane layer comprises a plurality of holes, and the yarns extend in the same direction and are parallel to one another; the screen cloth made of the first material and the monofilament diaphragm made of the second material are arranged among the combined film layers; wherein the first-material screen cloth and the second-material monofilament membrane are partially overlapped, the holes are formed in the position, overlapped with the first-material screen cloth, of the second-material monofilament membrane, and the combining membrane layers combine and clamp the position, overlapped with the first-material screen cloth, of the second-material monofilament membrane. And the combined film layers penetrate through the holes and are fixedly combined with one another. The monofilament membrane composite screen cloth structure can be suitable for screen cloth which does not comprise warp and weft yarn cross weaving holes.

This application relates to the technical field of composite structure protective films, and specifically discloses a composite laminated protective film for a folding screen and its production process. A composite laminated protective film for a folding screen comprises, from bottom to top in sequence, a polymer film layer, an ultra-thin flexible glass, a polymer film layer, and a functional coating; the preparation raw materials of the polymer film layer include the following components: 40 to 50 parts by mass of alicyclic epoxy resin, 20 to 30 parts by mass of hydroxyl-terminated polyisobutylene, 5 to 10 parts by mass of hydroxyl-terminated polybutadiene, 8 to 10 parts by mass of modified vinyl alkoxysilane, 5 to 7 parts by mass of modified nano-silica, 30 to 40 parts by mass of a curing agent, 0.4 to 0.6 parts by mass of a catalyst, and 30 to 50 parts by mass of a solvent; the composite laminated protective film prepared in this application shows excellent advantages in anti-bending performance and impact resistance.

A membrane composite comprising a polymeric membrane panel, an adhesive layer, and a release member, where the adhesive layer is a pressure-sensitive adhesive that is at least partially cured, and where the adhesive layer has a thickness of at least 102 μm

In order to solve the problem that an existing bipolar battery adopting liquid electrolyte has the risk of internal short circuit, the invention provides a composite current collector, the composite current collector comprises a base film, a first conducting layer and a second conducting layer, the base film is a polymeric film, the base film comprises a middle area and an edge packaging area, and the edge packaging area surrounds the periphery of the middle area; the first conductive layer covers the surface of one side of the middle area, and the second conductive layer covers the surface of the other side of the middle area; in the initial state, the porosity of the middle area is larger than that of the edge packaging area, at least part of pores of the middle area are through holes, and the porosity of the edge packaging area is smaller than 5%. Meanwhile, the invention also discloses a bipolar pole piece and a bipolar battery comprising the composite current collector. According to the invention, the risk of internal short circuit is effectively reduced on the premise of ensuring low impedance, and the bipolar battery with high energy density, low impedance and high safety is obtained.

The utility model discloses a lightweight battery structure, which comprises a battery roll core and a polymer conductive film layer, the battery roll core comprises a negative plate, a diaphragm layer and a positive plate, and the negative plate, the diaphragm layer and the positive plate are sequentially stacked; the polymer conductive film layer is wrapped on the outermost surface of the battery roll core and comprises a polymer film and a conductive piece, and the conductive piece is embedded on the polymer film. Therefore, as the polymer film material in the polymer conductive film layer is light, the overall quality and the manufacturing cost of the battery can be reduced, meanwhile, the conductive part is arranged on the polymer film, and the polymer film has a conductive effect through the conductive part, so that the traditional structural mode that a battery roll core is wrapped by a metal foil can be replaced, and the battery can be used for manufacturing the battery. Therefore, the overall weight of the battery can be reduced, and the lightweight design of the battery is realized.

The invention relates to the technical field of multi-layer composite polymeric membrane die cutting devices, and provides a multi-layer composite polymeric membrane one-time synchronous die cutting device and a forming technology.The multi-layer composite polymeric membrane one-time synchronous die cutting device comprises a machining table, the top of the machining table is fixedly connected with a die cutting table, a die cutting groove is formed in the die cutting table, and adsorption holes are formed in the die cutting table; a positioning mechanism is installed on the outer wall of the machining table and comprises a driving motor fixedly installed on the outer wall of the machining table, and an output shaft of the driving motor is fixedly connected with a threaded rod through a coupler. By starting a driving motor, a threaded rod can rotate, a movable block slides along a machining table, a piston fixedly connected with one end of a movable rod slides along an air cylinder, the air cylinder is driven to extract air inwards, an adsorption hole is made to extract air downwards, and the effect of conveniently adsorbing and positioning a multi-layer composite polymeric membrane placed on the die cutting table is achieved; therefore, the die cutting stability of the multi-layer composite polymeric membrane is improved.

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.

The invention discloses a batch preparation method of an ultra-flat graphene electron microscope support membrane, and belongs to the field of materials. The method comprises the following steps: separating graphene from a pre-oxidized copper metal growth substrate by using an electrochemical stripping method, and transferring the graphene and the pre-oxidized copper metal growth substrate to a polymer composite medium; and then conformally laminating the graphene supported by the polymeric membrane and the electron microscope grid by using a solvothermal lamination method, and removing the polymer medium to obtain the graphene grid. The method disclosed by the invention is simple in process, high in repeatability, strong in compatibility and capable of realizing large-scale preparation and production. The integrity of the graphene support membrane prepared by the method is as high as 90%, and the graphene in the suspended holes of the carrier net has the characteristics of ultra-flatness and good cleanliness.

The invention provides a polymeric membrane material, an optical membrane material and display equipment. The polymeric membrane material comprises a photopolymerization monomer, film-forming resin, blocked isocyanate and a photoinitiator before illumination, the film-forming resin comprises a compound containing active hydrogen, the photopolymerization monomer can be subjected to a polymerization reaction after illumination, and the blocked isocyanate and the compound containing active hydrogen can be subjected to a copolymerization reaction after heat treatment.

The present invention discloses a method for batch preparation of an ultra-flat graphene electron microscope support film, which belongs to the field of materials. The method of the present invention comprises: utilizing an electrochemical stripping method to separate graphene from a pre-oxidized copper metal growth substrate, and transferring the result to a polymer composite medium; then utilizing a solvent thermal bonding method to conformally bond the graphene supported by the polymer film to an electron microscope grid, and removing the polymer medium to obtain the graphene grid. The method of the present invention has a simple process, high repeatability, strong compatibility, and can be prepared and produced on a large scale. The graphene support film prepared by the method of the present invention has an integrity of up to 90%, and the graphene in the suspended holes of the grid has the characteristics of ultra-flatness and good cleanliness.

A preparation process for preparing a low-resistance polymer film by using plastic sintered plate waste, relating to the technical field of polymer film preparation. The electrical conductivity of a residual material generated during processing of plastic sintered plates is altered by means of methods such as cleaning, crushing, grinding and melt blending, thereby enhancing the efficient utilization of waste materials; this allows for the production of low-resistance polymer films from the residual material generated from the heads and tails of the plastic sintered plates. A three‑stage stretching operation is performed on a semi-finished film blank, and the stretched polymer film exhibits improved mechanical properties, electrical properties, and thermal stability. By optimizing the stretching process, waste of raw materials and energy consumption during processing can be reduced, thereby reducing production costs. The stretching stage operation can reduce internal defects and stress concentration of the films, thereby improving the overall quality and consistency of finished products.

Disclosed are affinity chromatography devices comprising a fibrillated heat treated polymeric membrane containing inorganic particles having a spherical shape and a particle size distribution with D90 / D10 less than or equal to 3. A blend or composition of spherical inorganic particles having a nominal particle size of about 5 microns to about 20 microns can be used. Further, the devices have a hydraulic permeability of about 200 (X 10 ‑12 cm 2 ) to about 700 (X 10 ‑12 cm 2 ). The affinity chromatography devices have a dynamic binding capacity (DBC) at 10% breakthrough of greater than 35 mg / ml at a residence time of 20 seconds. Additionally, the affinity chromatography devices have a cycle durability of at least 100 cycles at an operating pressure of no more than 0.3 MPa. Also disclosed are collectors comprising a plurality of affinity chromatography devices and a plurality of collectors in parallel configuration.