875 results about "Membrane technology" patented technology

The invention relates to the technical field of films, in particular to a flexible film special for a handwriting board and a preparation method of the flexible film. The flexible film is obtained by coating a release film with coating slurry and carrying out thermocuring, wherein the coating slurry contains modified polyurethane, a flatting agent, a defoaming agent and ethyl acetate. According to the modified polyurethane, polycarbonate diol, isophorone diisocyanate and other raw materials are subjected to a reaction, and a nano particle chain extender containing disulfide bonds is added. The nano particle chain extender containing disulfide bonds is prepared by modifying nano silicon dioxide and grafting cystamine dihydrochloride and diamino polyethylene glycol. Through nanoparticle surface modification and dynamic disulfide bond network construction, molecular-level coupling of a rigid reinforced phase and a flexible substrate, inhibition of nanoparticle aggregation and balance of strength and toughness are realized, the dynamic disulfide bond network can self-repair microcracks, and a high-quality special flexible film solution is provided for a high-performance handwriting board.

The invention relates to the technical field of capacitor films. The invention discloses a preparation process of a multilayer polypropylene capacitance film, which comprises the following steps: S1, raw material preparation: preparing basic resin, a nano ceramic filler, a nucleating agent and an antioxidant into multilayer raw materials respectively; s2, fusing multiple layers of raw materials by an independent screw extruder, and compounding by a co-extrusion die head to form a film blank; and S3, carrying out air ring gradient cooling on the film blank. And S4, longitudinally and transversely stretching the film blank. And S5, performing heat setting in a segmented heating furnace, and performing corona treatment to improve surface energy. And S6, segmentally curing the moisture-proof coating by using an infrared oven. The multilayer heterostructure is adopted, the comprehensive performance of the capacitor film is improved through material matching, the dielectric constant, the breakdown strength and the moisture resistance are enhanced, and the problem of considering the dielectric property and the mechanical property is solved. The innovative process guarantees stable performance, is compatible with an existing production line, can realize large-scale production, meets the requirements of fields such as new energy and the like, and provides a feasible scheme for localization of high-performance capacitor films.

The application provides application of a temperature-sensitive composite material in preparation of a separation membrane, a nanofiltration membrane and a preparation method, and particularly relates to the technical field of separation membranes. The temperature-sensitive composite material comprises a temperature-sensitive material and conductive fillers. The mass ratio of the temperature-sensitive material and the conductive fillers is 10-30:1-10. The application utilizes the characteristic that the temperature-sensitive material quickly responds to temperature changes, and the temperature-sensitive material transmits to the outside world through the conductive fillers, so that timely feedback and adjustment of the temperature in the preparation process of the separation membrane are realized, the isotropic separation membrane is prepared, the stability of the performance of the separation membrane is ensured, and the quality of the separation membrane product is improved.

The invention relates to dry-method electrode multi-stage rolling film forming equipment and a differential rolling method, and belongs to the technical field of dry-method electrode calendaring, the dry-method electrode multi-stage rolling film forming equipment comprises a first-stage rolling mechanism, a second-stage rolling mechanism and a third-stage rolling mechanism which are sequentially arranged in the material advancing direction, the first-stage rolling mechanism is used for primarily rolling fibrous network coated particle powder into a first-stage membrane, and the second-stage rolling mechanism is used for primarily rolling fibrous network coated particle powder into a second-stage membrane; the second-stage calendering mechanism overlaps the two layers of first-stage diaphragms and performs differential speed thinning calendering to form second-stage diaphragms; the third-stage calendering mechanism overlaps the two layers of second-stage diaphragms and performs differential speed thinning calendering to form finished diaphragms; the differential calendaring method comprises the steps of powder fibration coating preparation, first-stage calendaring synergetic film forming, second-stage differential superposition calendaring, first-time online thickness-density closed-loop correction, third-stage differential superposition calendaring and second-time online thickness-density closed-loop correction. The problem that in an existing dry-method electrode calendering film forming technology, the consistency of the compaction density and the surface density of a film is poor is effectively solved.

The invention discloses a polytetrafluoroethylene microporous membrane as well as a preparation method and application thereof, and belongs to the technical field of polytetrafluoroethylene microporous membranes. According to the invention, the polytetrafluoroethylene microporous membrane added with different amounts and different types of lubricants is prepared by a thermomechanical two-way stretching method, and the pore structure is researched. According to the invention, the entanglement density, the average pore size, the porosity, the hydrophobic property and the mechanical property can be regulated and controlled by changing the quantity and the type of the lubricant. And a new idea is provided for preparing the high-performance PTFE biaxially oriented film, and the method has a good application prospect.

The invention discloses a ZnO / PES mixed matrix ultrafiltration membrane and a polyaniline-ZnO / PES mixed matrix nanofiltration membrane as well as a preparation method and an application of the ZnO / PES mixed matrix ultrafiltration membrane and the polyaniline-ZnO / PES mixed matrix nanofiltration membrane. PES is used as an organic polymer, PEG1500 is used as a pore-foaming agent, ZnO is used as a nano filler, and the ZnO / PES composite ultrafiltration membrane is prepared through a non-solvent induced phase inversion method. The preparation method comprises the following steps: synthesizing a polyaniline coated ZnO nano composite material, blending zinc nitrate hexahydrate in ammonia water with a polyaniline solution to form a nano composite structure, and preparing the polyaniline-ZnO / PES mixed matrix nanofiltration membrane by taking the synthesized nano composite particles as a filler. According to the mixed matrix membrane technology, alkali and lignin in the black liquor can be directly recovered, compared with alkali recovery through a combustion method, the mixed matrix membrane technology has the advantages of being easy to operate, not complex in process, low in investment cost, small in occupied area, low in energy consumption, good in environmental compatibility and the like, and meanwhile subsequent high-valued comprehensive utilization can be conducted on lignin.

The invention relates to a low-temperature amino cross-linked modified self-polymerized microporous polymer gas separation membrane, a preparation method and application, and belongs to the technical field of gas separation membranes, and the preparation method comprises the following steps: 1) synthesizing a cross-linked precursor polymer PIM-BM through a bromomethylation reaction; (2) preparing a membrane casting solution from the PIM-BM and a micromolecular amine cross-linking agent, casting, and volatilizing to form a membrane; and 3) carrying out heat treatment at 40-80 DEG C under a vacuum condition for 6-32 hours to form a cross-linked network structure, wherein the thickness of the film is 40-120 microns. According to the invention, a covalent cross-linked network is constructed through a low-temperature Hofmann alkylation reaction of an amine cross-linking agent so as to limit the movement of a polymer chain segment; the strong CO2 affinity of amido (-NH2) realizes dissolution selectivity compensation, and the diffusion selectivity synergistic effect of an inherent micropore channel of PIM-BM is combined, so that the tradeoff limitation of permeability-selectivity of a traditional gas separation membrane is broken through; the cross-linked structure can effectively improve the physical aging resistance of the PIM-BM film, and has good long-term continuous operation stability; the preparation process is low in low-temperature process energy consumption, easy to scale, suitable for the fields of coal-fired flue gas CO2 capture, natural gas purification and the like, and has industrial application potential.

The invention discloses a gas separation membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The gas separation membrane comprises a separation layer comprising a network and PTI nanosheets dispersed in the network, the network comprising at least one of a biopolymer network and a chemical polymer network; selectively, the device further comprises a supporting layer which is arranged below the separation layer and is combined with the separation layer. The preparation method of the gas separation membrane comprises the following step A or step B: step A: enabling raw materials of PTI nanosheets and networks to form a membrane on the surface of polymer hydrogel to obtain the gas separation membrane; and step B, enabling the PTI nanosheet and the network raw material to form a membrane on the surface of the material of the support layer to obtain the gas separation membrane. The gas separation membrane provided by the invention is an N2 preferential permeation membrane, and has relatively high N2 permeation rate and relatively high N2 / CO2 selectivity.

The invention discloses a method and a device for determining a diffusion coefficient in a charged micropollutant nanofiltration membrane in the technical field of membranes. The method comprises the following steps: arranging a four-electrode electrochemical system in an H-type electrolytic tank, adding a micropollutant solution into the H-type electrolytic tank, and analyzing the micropollutant solution by adopting linear scanning voltammetry to obtain first data; according to the method, a micro-pollutant solution system, a micro-pollutant solution and nanofiltration membrane system and micro-pollutant solutions and nanofiltration membrane systems with different concentrations are tested and analyzed based on a four-electrode electrochemical system in an H-shaped electrolytic tank, and corresponding solution intrinsic conductivity data, system conductivity data and open-circuit voltage data are obtained; the method has the advantages of simple test steps, fast data acquisition, short overall test period, fast replacement and adjustment of the micropollutant solution and the nanofiltration membrane, wide application range, simple and effective linear fitting data processing process, and good repeatability.

The invention discloses a preparation method of an artificial cell coated with a macrophage membrane, and belongs to the technical field of artificial cell preparation. The preparation method comprises the following steps: dissolving poly (diallyldimethylammonium chloride) and sulfobutyl-beta-cyclodextrin in ultrapure water, and mixing an aqueous solution of the poly (diallyldimethylammonium chloride) and an aqueous solution of the sulfobutyl-beta-cyclodextrin to obtain a PDDA / SBE-beta-CD condensation liquid droplet solution; and mixing the macrophage membrane suspension and the PDDA / SBE-beta-CD condensed fluid drops in an equal mass ratio, and realizing in-situ coating of the macrophage membrane by adopting an ultrasonic coating technology to obtain the artificial cell coated with the macrophage membrane. The PDDA / SBE-beta-CD condensation liquid droplet constructed by the invention has good stability under the conditions of physiological salt concentration and pH and at 37 DEG C; the artificial cell coated with the macrophage membrane is prepared by mixing with the macrophage membrane suspension, and the macrophage membrane serving as a shell not only can prevent aggregate aggregation, but also can improve the structural stability and biocompatibility.

The invention belongs to the technical field of electroplating, and particularly discloses a real-time supplementing method for plating solution metal cations during electroplating. Aiming at the problems of large concentration fluctuation of metal cations and low supplementing efficiency in the traditional electroplating process, the method realizes dynamic balance of the metal cations through an electroplating synchronous electrolysis and anion exchange membrane technology. According to the technical key points, an electroplating liquid chamber and an electrolyte chamber are separated by adopting an anion exchange membrane; ions are supplemented by electrolyzing a soluble single-metal anode corresponding to metal to be plated, and meanwhile, an electrolytic cathode is arranged in an electrolyte chamber, so that metal deposition is avoided; the ion-selective electrode is used for monitoring the concentration of metal cations in real time, and the electrolytic current is automatically adjusted when the concentration deviation exceeds + / -5%. According to the method, ions are directionally supplemented through electrolysis, plating solution pollution and component fluctuation are avoided, and the uniformity and the qualification rate of a plating layer are improved. And the method is suitable for single-metal and multi-element alloy electroplating systems, can be integrated in processes such as jet electrodeposition and bath plating, is high in adaptability, and has industrial application potential.

The invention belongs to the technical field of membranes, and particularly relates to a composite membrane with polyfunctional group organic mesoporous nanoparticles as a middle layer and a preparation method of the composite membrane. The composite membrane is of a three-layer structure and comprises a porous supporting layer, a middle layer and a selective separation surface layer, the middle layer is polyfunctional group organic mesoporous nanoparticles with good water dispersibility and excellent stability, and the selective separation surface layer is polyamide; the preparation method comprises the following steps: loading organic mesoporous nanoparticles on the surface of the porous support layer to form the middle layer; and polymerizing on the surface interface of the middle layer to form a selective separation surface layer. The middle layer contains polyfunctional groups, can interact with a water-phase polyamine monomer and controls the diffusion of the monomer in an interfacial polymerization process, so that the structure of the selective polymer separation layer is regulated and controlled, and the surface appearance and thickness of the separation layer are optimized; due to the mesopore hydrophilic property of the middle layer, a rapid water transmission channel can be constructed, and the membrane flux is effectively improved. The composite membrane provided by the invention has excellent water flux, salt rejection rate and monovalent and divalent anion selectivity.

The invention relates to the technical field of special polymer functional membranes, and discloses a polybenzimidazole gas separation membrane as well as a preparation method and application thereof, the polybenzimidazole gas separation membrane has an interpenetrating network-shaped pore structure, and the polybenzimidazole gas separation membrane has a nanoscale pore structure. The pore size distribution of the nanoscale pore structure is 0.1-30 nm, and the average pore size of the nanoscale pore structure is 1-80 nm. The polybenzimidazole gas separation membrane has an interpenetrating network-shaped pore structure and a nanoscale pore structure, so that the polybenzimidazole gas separation membrane has relatively high gas selectivity and permeability coefficient and also has relatively good mechanical properties.

The invention discloses a seawater carbon source and carbon sink cyclic conversion system and method, and the system comprises a seawater carbon sequestration unit which is used for receiving seawater and mixing the seawater with carbon dioxide and alkali to generate carbonate precipitate so as to obtain pre-softened seawater; the deep hardness removal unit is used for receiving the pre-softened seawater and treating the pre-softened seawater to obtain hardness-removed seawater; the deep concentration unit is used for receiving the hardness-removed seawater and concentrating the hardness-removed seawater to obtain concentrated seawater; the bipolar membrane unit comprises a salt chamber, an acid chamber and an alkali chamber and is used for receiving the concentrated seawater and preparing acid and alkali; and the seawater carbon capture unit comprises a first degassing film, a first adjusting tank, a second degassing film and a second adjusting tank which are connected in sequence. The bipolar membrane technology is adopted for treating softened seawater to prepare acid and alkali in situ, acid is provided for the seawater carbon sequestration unit, alkali is provided for the seawater carbon capture unit, the two processes of seawater carbon sequestration and seawater carbon capture are coupled, and acid and alkali consumption balance and seawater carbon source and carbon sink circulation conversion are achieved.

The invention discloses a circulating water blow-off water reuse treatment system, and relates to the field of circulating cooling water treatment, the system comprises: an induced crystallization unit, which is used for carrying out primary treatment on circulating water blow-off water through an induced crystallization fluidized bed reactor to remove hardness ions in water; the ceramic membrane filtering unit is used for carrying out secondary treatment on the primarily treated water by utilizing a ceramic membrane device and removing residual hardness ions, organic matters and suspended matters in the water; and the nanofiltration membrane unit is used for performing tertiary treatment on the water by utilizing a nanofiltration membrane according to the secondary treatment result to remove salt and organic matters in the water. According to the method, induced crystallization, ceramic membrane and nanofiltration membrane technologies are combined to cooperatively treat the circulating water and the blow-down water, so that the operation mode of simplifying the process, reducing the energy consumption and prolonging the backwashing period is realized, the dosage of chemicals and the generation of sludge are reduced, and the water recovery rate is also improved, so that the hardness is removed, and the calcium resource recovery is realized.

The invention discloses a dry-method solid-state electrolyte membrane as well as a preparation method and application thereof, belongs to the technical field of dry-method solid-state electrolyte membranes, and overcomes the defects that in the prior art, a relatively thin dry-method solid-state electrolyte membrane is easy to crack, cannot be self-supported and is low in ionic conductivity, and the solid-state electrolyte membrane is in poor contact with a solid-solid interface of an electrode. The dry-method solid electrolyte membrane comprises the following components in percentage by mass: 90%-96% of a solid electrolyte material, 1.5%-3% of polytetrafluoroethylene and 1%-8.5% of a lithiated polymer, the lithiated polymer comprises a lithium salt and a non-polar polymer; the number-average molecular weight of the non-polar polymer is less than or equal to 105, the melting point of the non-polar polymer is less than or equal to 55 DEG C, and the ionic conductivity of the non-polar polymer is greater than or equal to 10 <-6 > S / cm. The transverse tensile strength, the longitudinal tensile strength, the ionic conductivity and the cycle performance of the dry-method solid electrolyte membrane are remarkably improved.

The invention discloses a preparation method of an ultrathin sulfide solid electrolyte dry-method membrane, relates to the technical field of solid electrolyte dry-method membranes, and solves the problems that a traditional solid electrolyte dry-method membrane needs to be subjected to transfer printing after being rolled, holes and cracks exist in an electrolyte membrane during transfer printing, and the thickness of the electrolyte membrane is difficult to reach 30 microns or below. Comprising the following steps: S1, preparing a positive thick film; s2, preparing an electrolyte thick film; s3, sequentially stacking the release film, the positive electrode thick film and the electrolyte thick film to form a laminated structure; s4, carrying out multi-stage rolling on the laminated structure by using a roller press and adopting a differential temperature multi-stage composite rolling method, and carrying out synchronous thinning and compounding on the positive electrode thick film and the electrolyte thick film to form a composite film; and S5, stripping the release film from the composite film to obtain the ultrathin sulfide solid electrolyte dry film. The problem that holes and cracks are generated in the transfer printing link after rolling of a traditional electrolyte thick film is solved.

The utility model discloses a hot air flow equalizing and drying device for polyimide film production, and relates to the technical field of polyimide films. Supporting strips are symmetrically installed on the front side and the rear side of the lower end of the processing box, supporting bases are symmetrically installed at the lower ends of the supporting strips, filtering boxes are arranged in the middles of the upper end and the lower end of the processing box, fans are arranged in the filtering boxes, and a feeding port and a discharging port are formed in the front end and the rear end of the processing box correspondingly. A high-temperature box external controller is arranged between the first blowing boxes and the second blowing boxes, a fan is started to convey gas to the first blowing boxes, meanwhile, a heating rod is started to heat the gas exhausted by the first blowing boxes, and the upper and lower first blowing boxes are used for conducting double-face hot air drying on the flowing film, so that the film is heated evenly; and the production efficiency of the polyimide film raw material is improved.

The invention provides a hydrogel hydrophilic modified gradient pore oil-water separation membrane as well as a preparation method and application thereof, and belongs to the technical field of separation membranes. The hydrogel hydrophilic modified gradient pore oil-water separation membrane comprises a base membrane with a porous structure and a hydrogel layer coated on a porous structure framework of the base membrane, and a gradient pore structure with a small pore diameter on one side and a large pore diameter on the other side is formed. The hydrogel hydrophilic modified gradient pore oil-water separation membrane prepared by the method has a super-hydrophilic and super-oleophobic surface and has excellent anti-fouling performance and oil interception performance, the gradually expanded pore diameter can provide large oil-water separation flux, emulsified oil with surface activity can be effectively treated, and the oil-water separation membrane has the advantages of high oil-water separation efficiency, high oil-water separation efficiency and the like. And excellent pollution resistance is maintained under different environmental conditions, and long-term stable operation is realized.

The invention discloses a device for treating high-concentration ammonium salt wastewater by adopting a membrane technology, which belongs to the field of sewage treatment, is used for treating the high-concentration ammonium salt wastewater, and comprises the following steps: adjusting the alkali of the wastewater injected into a mother liquor tank, heating the alkali-adjusted wastewater in a mother liquor preheater, and heating the mother liquor preheater; the heated wastewater is fed into a liquid inlet of the columnar membrane reactor and forms turbulent flow through a liquid distribution pipe and a flow guide baffle in the columnar membrane reactor; a sulfuric acid solution in the acid storage tank is fed into an acid inlet of the columnar membrane reactor through a pump body, and the sulfuric acid solution and wastewater are located on the two sides of the hollow fiber membrane respectively and form a concentration gradient; and the sulfuric acid solution after generating ammonium sulfate crystals circularly enters the acid storage tank. According to the application, ammonia nitrogen selective adsorption in the presence of antibiotics can be successfully realized, ammonia nitrogen can be converted into high-added-value products, and cyclic utilization and appreciation of resources are realized.

The invention belongs to the technical field of functional films, and particularly relates to a preparation method of a high-thickness graphene heat conduction film. Comprising the following steps: (1) low-functionalized graphene powder is taken as a raw material, the content of an additive in the raw material is not more than 20wt%, and the solvent content is not more than 10wt%; (2) carrying out hot press molding on the raw materials in the step (1) at the temperature of 25-300 DEG C to obtain a dense graphene thick film; and (3) carrying out heat treatment on the dense graphene thick film in the step (2) in an atmosphere furnace with the temperature of 1000-3300 DEG C for a certain time to ensure interlayer ordering and crystal graphitization, so as to obtain the graphene heat-conducting film with high thickness and high heat conductivity, the thickness of the graphene heat-conducting film can reach more than 200 microns, and the heat conductivity of the graphene heat-conducting film can reach more than 1300W / mK. The preparation method is simple in operation process, low in cost, easy in scale amplification and suitable for preparation and performance improvement of the ultra-high-thickness graphene heat-conducting film, and the application range of the graphene film in the fields of heat management, electromagnetic shielding, nuclear technology, high-end instrument equipment and the like is widened.

A membrane technology based on a wettability material has the problem of membrane pollution and cannot efficiently and stably separate and purify oil-containing wastewater, so that a preparation method of a hydrophilic membrane with excellent hydrophilicity and an open pore channel is urgently needed. The invention discloses an ultrahigh hydrophilic membrane for efficiently and stably separating an oil-in-water emulsion, which is characterized in that magnetic nanoparticles (Fe3O4 MNPs) are wrapped in membrane fibers through electrostatic spinning and an in-situ growth method, and a hydrophilic polyaniline rough micro-nanosphere structure grows on the surface of the membrane fibers. Under the action of a magnetic field, the magnetic particles obtain magnetism, the generated magnetic interaction force pulls the nanofiber to optimize the membrane structure, and hydrophilic groups are further exposed while membrane holes are supported. The flux of the prepared three-dimensional hydrophilic membrane for separating n-hexane-in-water emulsion under the action of a 0.2 T magnetic field is up to 8957.9 Lm <-2 > h <-1 >, and the efficiency is up to 99.87%. The membrane shows optimal separation performance in short-term and long-term cycle tests, and is expected to be applied to actual oily wastewater purification scenes.

The invention provides a preparation method and application of a high-sensitivity imprinted membrane for selectively detecting microcystic toxins (MC-LR) in water based on surface enhanced Raman scattering. The preparation method comprises the following steps: step 1, preparation of silver nanocubes; step 2, preparation of Ag NCs-coated TiO2 nanoparticles; step 3, preparation of an Ag NCs-coated TiO2 / PDMS composite membrane; according to the invention, a membrane technology, an SERS technology and MIT are combined, so that the prepared product has excellent physical and chemical properties of a PDMS membrane, high sensitivity of an SERS detection technology and high selectivity of MIT; the invention provides a new method for SERS detection and widens the application range.

The invention belongs to the technical field of battery diaphragms, and relates to a wet-process bidirectional asynchronous and synchronous coexisting diaphragm preparation method, which comprises the following operation steps: material mixing and extrusion, longitudinal stretching, synchronous small-draw-ratio stretching, primary transverse stretching, extraction, secondary transverse stretching, and diaphragm forming and rolling. According to the technology, synchronous stretching and bidirectional asynchronous stretching are combined in the wet process field, transverse stretching of a membrane is divided into two times, synchronous small-draw-ratio stretching operation is set between longitudinal stretching and one-time transverse stretching, transverse and longitudinal simultaneous stretching is completed after longitudinal stretching, the obtained lattice structure is firm, and the consistency of molecular orientation is guaranteed; the diaphragm prepared by the process has the characteristics of high strength, low thickness, high gap uniformity and consistency and the like; the process mode is flexible and changeable, the diversity of wet process adjustment can be increased, more possibilities are provided for new product development, product performance is optimized, and a larger process window is provided for development of ultra-thin and ultra-strong products.

The invention discloses a low-water-permeability and low-oxygen-permeability photoresist protective film and a preparation method thereof, and relates to the technical field of dry film photoresist protective films, the protective film comprises an inner layer, a middle layer and an outer layer, the inner layer is prepared from 100 parts of low-density polyethylene and 0.1-0.3 part of a release agent, and the middle layer is prepared from 0.1-0.3 part of a curing agent; the middle layer is prepared from 20-80 parts of low-density polyethylene, 10-40 parts of high-density polyethylene, 10-30 parts of a binder, 6-12 parts of modified silicon dioxide and 1-2 parts of an antistatic agent, and the outer layer is prepared from 10-90 parts of low-density polyethylene, 10-40 parts of metallocene low-density polyethylene and 0.1-0.5 part of an anti-sticking agent; according to the invention, excellent water and oxygen double barrier properties are realized, excellent protection can be provided for a dry film photoresist film, the dry film photoresist film has the characteristics of high mechanical strength, static resistance, clean stripping and the like, the process stability and the product yield in chip manufacturing are powerfully guaranteed, and the application value is remarkable.

The invention provides an ultrathin swelling-resistant GO cross-linked membrane as well as a preparation method and application thereof, and belongs to the technical field of nanofiltration separation membrane technology separation. The composite membrane comprises a cross-linked GO separation layer and a supporting layer, a m-xylylenediamine MXDA cross-linked GO layer is used as the separation layer, and a hydrolyzed polyacrylonitrile hPAN polymer membrane is used as the supporting layer; wherein the GO layer and the hPAN polymer film are covalently bonded through MXDA to form a cross-linked network. The preparation method comprises the following steps: firstly, respectively preparing graphene oxide GO; secondly, hydrolyzing a polyacrylonitrile (hPAN) matrix membrane; and finally, constructing a dual cross-linked network system through heat treatment, so that covalent cross-linked bonds are formed between GO nanosheet layers and between GO-hPAN base membranes, and the GO cross-linked membrane is prepared. The density of carboxylic acid groups on the surface of the hPAN membrane can be dynamically optimized by regulating and controlling the type of the basic catalyst, the concentration of the solution, the hydrolysis temperature and the hydrolysis time, a high-efficiency mass transfer channel is created for the composite membrane through a two-dimensional covalent cross-linked structure, and the composite membrane is endowed with excellent dye selective separation performance and anti-swelling stability.

The utility model relates to a material trolley and a film pressing mechanism, and belongs to the technical field of film laminating, the material trolley comprises a material trolley body and at least one cutting structure, the material trolley body is used for bearing at least one to-be-laminated piece, and the at least one cutting structure is arranged on the material trolley body and corresponds to the to-be-laminated piece in a one-to-one mode; each cutting structure can move on the material trolley body in the first horizontal direction, and each cutting structure is controlled to cut the soft film after the soft film is combined to the surface of the part to be coated with the film. And at least one cutting structure is used for cutting and separating the soft film on the material trolley body and the soft film outside the material trolley body. The cutting structure is arranged on the material vehicle, so that the soft film cutting process can be carried out in the moving process of the material vehicle, the situation that the material vehicle needs to stop and wait when the cutting process is carried out is avoided, and the working efficiency is greatly improved.

This invention relates to the field of polytetrafluoroethylene (ePTFE) membrane technology. Addressing the problem that existing expanded PTFE films cannot meet the high-performance standards of superhydrophobicity and superoleophobicity, this invention specifically discloses an expanded PTFE composite membrane and its preparation method. The expanded PTFE composite membrane includes an ePTFE base membrane and an fPTFE / SiO2 particle composite layer disposed on the surface of the ePTFE base membrane. The fPTFE / SiO2 particle composite layer includes a PTFE composite and SiO2 particles. The PTFE composite comprises polyethylene oxide and PTFE in a dry weight ratio of 1:10-30, and the SiO2 particles have a particle size of 100-1000 nm. By coating the ePTFE base membrane with PTFE and SiO2 particles to construct the fPTFE / SiO2 particle composite layer, and then modifying the membrane surface with silica-fluorination, the distribution of SiO2 particles can be specifically controlled to impart superhydrophobic and superoleophobic properties to the expanded PTFE composite membrane, with both water and oil contact angles >150°.

The invention belongs to the technical field of composite current collector base films, and particularly relates to a high-performance BOPP film for a composite current collector and a preparation method thereof.The preparation method comprises the steps that firstly, PP master batches, functional auxiliaries and composite filler are mixed, melt extrusion and two-way stretching film forming are conducted, and a PP base film is prepared; then carrying out corona treatment on the PP base film, and uniformly coating the PP base film with the coating liquid in an online coating manner; and finally, curing to form a film, and drawing and rolling. Wherein the composite filler is prepared by the following steps: putting MAH-g-PP and nanoparticles into an extruder, adding a stearic acid lubricant and polyvinyl alcohol at the same time, and carrying out extrusion granulation. The preparation method has the beneficial effects that the nano particles treated by MAH-g-PP are added into PP, so that the mechanical strength of the base film is remarkably improved; the cured coating is formed on the surface of the base film, so that the interface bonding force with metal ions is remarkably improved; the synergistic effect of the two improves the heat resistance of the base film.

The invention relates to a preparation process of a metal ceramic bionic multilayer film, and belongs to the technical field of metal ceramic films, and the metal ceramic bionic multilayer film comprises a porous metal matrix, a gradient transition layer, a bionic lamination layer and a nanopore separation layer. According to the method, the failure problem of a traditional metal ceramic film under the extreme working condition is systematically solved through the multi-level innovative design, firstly, in the aspects of thermal stress elimination and interface strengthening, a five-layer gradient transition layer structure with the ceramic content changing is adopted, and the plasma spraying-laser remelting synchronous machining technology is combined; the thermal expansion coefficient of the metal matrix and the ceramic layer is continuously and gradually changed, so that the interface thermal stress is effectively reduced, the bonding strength is improved, the problems of cracking and layering under the high-temperature working condition are effectively solved, the service life is effectively prolonged, the structure is strengthened and toughened, and the bionic lamination design simulates the'brick-mud 'structure of a shell pearl layer; the nano-scale metal layer absorbs crack energy, and the ceramic layer provides rigid support, so that the fracture toughness is effectively improved.