236 results about "Coaxial electrospinning" patented technology

The invention relates to a flame-retardant and heat-insulating aerogel composite material as well as a preparation method and application thereof, and belongs to the technical field of novel building materials. The fiber aerogel is prepared through coaxial electrostatic spinning, an injector containing a polymer spinning solution is connected to a skin layer needle tube connecting port, an injector containing air is connected to a core layer needle tube connecting port, coaxial electrostatic spinning is carried out to prepare micron fibers with skin-core structures, the micron fibers fall on a receiving base material, and the micron fibers with the skin-core structures fall on the receiving base material. A hollow fiber aerogel material with a three-dimensional fluffy structure is obtained, in-situ growth of hydrated nano silicate particles is carried out after thermal crosslinking treatment, the nano silicate particles grow along the fiber surface and cover the micron fiber surface of the hollow fiber aerogel material, and the aerogel composite material is obtained. The hydrated nano silicate particle growth solution comprises polyvinyl alcohol, calcium salt, silicate and aluminum salt. The prepared aerogel composite material has excellent flame retardance and heat insulation performance and is suitable for being used as a building material.

The invention discloses a preparation method of a composite phase-change temperature-adjusting organic fiber membrane with a flexible core-shell structure, and belongs to the field of intelligent textile materials.The preparation method comprises the following steps that polyacrylonitrile (PAN) serves as a sheath layer material, n-octadecane serves as a core layer phase-change material, and the composite phase-change fiber membrane is prepared through a melt spinning method and a coaxial electrostatic spinning technology. According to the invention, the fiber membrane with high melting enthalpy value (171.6 J / g), excellent thermal stability (the latent heat is still 117.7 J / g after 100 times of heating-cooling circulation) and excellent mechanical properties (the tensile strength is 2.418 MPa, the tensile yield stress is 2.331 MPa, the tensile strain at break is 36.5%, and the elastic modulus is 58.226 MPa) can be prepared; a new thought is provided for preparing intelligent textiles with good flexibility and efficient heat management capability.

The invention provides an injectable short-fiber-based hydrogel tissue repair material with an electric response characteristic as well as a preparation method and application thereof, and the injectable short-fiber-based hydrogel tissue repair material with the electric response characteristic is prepared by taking a natural polymer material loaded with bioactive factors as a core layer material and a biodegradable material as a shell layer material through a coaxial electrostatic spinning technology. The method comprises the following steps: preparing short fibers with a core-shell structure, uniformly mixing the short fibers with a hydrogel matrix, injecting and filling a tissue defect part, and carrying out ultraviolet curing to form the tissue repair material. The injectable short-fiber-based hydrogel tissue repair material with the electrical response characteristic provided by the invention has piezoelectric characteristic and injectable characteristic, can generate electrical response through mechanical stimulation so as to promote cell proliferation and tissue repair, and also has controllable drug release capacity and good mechanical adaptability; the method is suitable for application scenes of complex tissue damage repair such as diabetes infected wound repair, articular cartilage repair, oral barrier membrane repair, abdominal wall defect repair and the like.

The invention belongs to the field of synthesis and preparation of organic and inorganic hybrid materials, and particularly relates to a gamma-ray shielding nanofiber membrane with a core-shell structure and a preparation method of the gamma-ray shielding nanofiber membrane. The nanofiber membrane is of a double-layer structure comprising a shell and an inner core, the shell is composed of heavy metal micro-nano particles with the medium-high energy segment gamma ray shielding capacity and a high-molecular polymer, and the inner core is composed of heavy metal micro-nano particles with the medium-low energy segment gamma ray shielding capacity and a light high-molecular polymer. The preparation method comprises the following steps: carrying out surface modification on the heavy metal micro-nano particles, preparing a polymer electrostatic spinning precursor solution, and preparing the core-shell structure nanofiber by adopting a coaxial electrostatic spinning technology. The prepared nanofiber membrane has the advantages of light weight, efficient shielding performance and good mechanical performance, is suitable for radioactive protection occasions, can endow other functions through modification or compounding, and has wide application prospects.

The invention discloses a preparation method of a mullite ceramic fiber with a hollow hierarchical structure, and belongs to the technical field of ceramic fiber material preparation. The preparation method comprises the following steps: firstly, preparing hollow mullite fibers by utilizing coaxial electrostatic spinning, and then growing a hierarchical structure of mullite whiskers on the hollow mullite fibers. The preparation method of the hierarchical structure comprises the following steps: by taking hollow mullite fibers as a matrix, carrying out vacuum impregnation with an aluminum-silicon nano powder solution, then carrying out vacuum impregnation with a fluoride solution, and calcining to obtain the hollow hierarchical mullite ceramic fibers. The preparation method of the porous mullite fiber is simple, the pore structure is easy to control, and the heat insulation performance is excellent. The mullite graded fiber prepared by the method has excellent high-temperature resistance and light weight, can be used for preparing a high-temperature-resistant heat insulation piece, and can provide a novel light high-temperature-resistant heat insulation material for the fields of spaceflight and military industry and the like.

The invention relates to a device and a method for preparing nanofiber core-spun yarn through batch coaxial electrostatic spinning. The device comprises a needleless dish-shaped spray head, an air blowing auxiliary device, a liquid supply device, an annular twisting device, a high-pressure generator, a negative-pressure air suction device, a winding device and an unwinding device. The core yarn penetrates through the axis of the needleless dish-shaped nozzle, the nanofiber generated by the needleless dish-shaped nozzle coaxially wraps the surface of the core yarn through the whole spinning device, and batch preparation can be achieved. The device is further provided with an air blowing auxiliary device and a negative pressure air suction device, under the air blowing effect of an air blowing nozzle and the adsorption effect of a negative pressure air suction shell, airflow force can be generated to promote jet flow to be further stretched in a straightened mode, under the common influence of electric field force and the airflow force, the jet flow is fully stretched, bending is reduced, and the service life of the jet flow is prolonged. Therefore, the nanofiber bundles can continuously cover the surface of the core yarn in a high-orientation state under the traction of the annular twisting device, and the continuous nanofiber core-spun yarn is formed.

The invention relates to the technical field of water electrolysis hydrogen production, in particular to a self-supporting hollow carbon membrane electrode and a preparation method and application thereof.The preparation method comprises the following steps that a self-supporting hollow carbon nanofiber membrane with metal M and metal M compound heterojunction is prepared through a coaxial electrostatic spinning technology; the self-supporting electrode with a high specific surface area and a rapid mass transfer channel is formed by regulating and controlling the flow rate of the spinning solution of the outer layer and the inner layer and a high-temperature carbonization process, the metal M is selected from one of iron, cobalt, nickel, manganese and molybdenum, and the metal M compound is one of oxide, hydroxide, carbide, nitride, phosphide and chalcogenide. Compared with the prior art, the self-supporting hollow carbon membrane electrode disclosed by the invention has good mechanical stability, good hydrophilic and hydrophobic properties and excellent HER and OER bifunctional catalytic activity, and can be used for efficiently and completely decomposing water.

The present invention discloses an air filtration membrane based on nanohybrid-modified polylactic acid fiber and a preparation method thereof. The present invention adopts a microwave-assisted in-situ synthesis method to directly induce the in-situ growth of ZIF-8 nanocrystals on the surface of CNTs to obtain CNT@ZIF-8 nanohybrids. Through coaxial electrospinning technology, an air filtration membrane with CNT@ZIF-8 uniformly embedded in polylactic acid fibers is obtained. The preparation method of the present invention is simple and the conditions are controllable. The prepared air filtration fiber membrane has the advantages of high surface potential, large specific surface area, good air permeability, long-term filtration, etc., and is an air filtration material with broad application prospects.

The invention belongs to the technical field of intelligent food packaging films, and particularly relates to a nanometer composite fiber film based on vegetable protein and application of the nanometer composite fiber film. The preparation method comprises the following steps: dissolving gallic acid, an anthocyanin composite extract and rapeseed protein in deionized water, and uniformly stirring to obtain a spinning core solution; the preparation method comprises the following steps: dissolving zein in acetic acid, and then adding into water to obtain zein soluble liquid; uniformly mixing and stirring the zein solution and the Arabic gum mixed solution to obtain a shell solution; the shell liquid and the core liquid are subjected to coaxial electrostatic spinning, tin foil paper serves as a receiving base material and is collected through a rotary drum, and finally the nano-composite fiber membrane is obtained. According to the method, the color development difference of anthocyanin under different pH conditions is widened, the color development sensitivity is improved, and the freshness of food can be judged more visually according to color changes. Meanwhile, the composite membrane prepared through electrostatic spinning has larger specific surface area and higher ductility, and the mechanical performance of the composite membrane is improved.

A preparation method for a nanocomposite fiber membrane material based on a bio-based liquefied formaldehyde resin is provided. A bio-based raw material is processed through a phenol / polyethylene glycol complex liquefaction process, followed by divalent alkali metal hydroxide high ortho-position induction synthesis resinification and modification with the polymer polyvinyl alcohol to create a spinnable precursor as PVA-BLF. Subsequently, a coaxial electrospinning device is utilized, where PVA-BLF serves as a core layer and a titanium dioxide dispersion is used as a shell layer, to fabricate a PVA-BLF / TiO2 nanocomposite fiber membrane material. The average diameter of the nanocomposite fiber membrane is 150-450 nm, and the specific surface area is 500-700 m2 / g. The porosity exceeds 60%, and the fracture elongation ranges from 5.5% to 6.5%, demonstrating excellent filtration performance and excellent regeneration performance, which can be developed as adsorption materials for water and air purification.

The invention discloses an antibacterial hyaluronic acid wound dressing with a core-shell structure and a preparation method of the antibacterial hyaluronic acid wound dressing, and belongs to the field of biomedical materials. The core-shell structure nanofiber is prepared by adopting a coaxial electrospinning technology, and the preparation mode is superior to the solid structure nanofiber prepared by common electrospinning. According to the invention, polyvinyl butyral, a polyethylene oxide solution, zein and a modified hyaluronic acid solution are simultaneously sprayed out by using concentrically arranged nozzles, and are drawn into fibers by using electrostatic force, so that drugs wrapped in the fiber structure can realize controlled release and lasting effects; and a new scheme is provided for preparation of wound dressing.

The present invention discloses a novel gas-sensitive material, specifically a method for preparing a core-shell nanofiber gas-sensitive material based on a platinum-doped cobalt oxide / tin oxide heterostructure. The present invention utilizes a cobalt source, a tin source, a platinum source, and a polymer as raw materials, and produces a nanoscale platinum-doped cobalt oxide / tin oxide gas-sensitive material with high sensitivity and rapid response to hydrogen sulfide gas via coaxial electrospinning. This gas-sensitive material exhibits excellent gas-sensing properties for H2S gas at room temperature, with a short response time, enabling rapid detection of low-concentration H2S gas, a short recovery time, and excellent cyclic stability. Therefore, the gas-sensitive material of the present invention possesses excellent sensitivity and stability, and has broad application prospects, including applications in environmental monitoring, industrial safety, and gas sensors.

The invention discloses a preparation method and application of a plasma catalyst, and belongs to the field of environmental catalytic materials. Aiming at the problems of insufficient micro discharge quantity, low energy efficiency, easy catalyst deactivation and the like in the existing plasma catalysis technology, the invention provides the hollow fibrous perovskite type titanate composite catalyst. According to the catalyst, a carrier is prepared by combining a coaxial electrostatic spinning technology with a gradient calcination process, and then a transition metal active component is loaded, so that the plasma discharge intensity and the pollutant degradation efficiency are remarkably enhanced.

The utility model belongs to the technical field of electrostatic spinning, and particularly discloses a multi-nozzle coaxial electrostatic spinning device which comprises a frame, a lifting mechanism and a high-voltage power source, a receiver and an electrostatic metal plate which are arranged in parallel are fixedly connected in the frame, and the receiver is arranged close to the bottom of the frame and electrically connected with the negative electrode of the high-voltage power source. The electrostatic metal plate is located above the receiver and electrically connected with the positive electrode of the high-voltage power source, the lifting mechanism is arranged in the frame and located above the electrostatic metal plate, a plurality of coaxial sprayers arranged at equal intervals are fixedly connected to the lower portion of the lifting mechanism, and through holes allowing needle tips of the coaxial sprayers to penetrate through are formed in the electrostatic metal plate; and liquid inlets in the coaxial spray heads correspond to liquid supply devices respectively. According to the utility model, the lifting component is arranged, so that the intensity of an electric field is not changed when a filament forming path is adjusted, the condition that fiber filaments are different in thickness due to the change of the intensity of the electric field is avoided, and the filament forming quality of the fibers is improved.

The invention discloses a core-shell structure polystyrene / polylactic acid spinning fiber loaded with pheromone and a preparation method of the core-shell structure polystyrene / polylactic acid spinning fiber. A coaxial electrostatic spinning method is adopted for preparation, a core solution is a polylactic acid solution and sex pheromone mixed solution, a shell solution is a polystyrene solution, a formed spinning film is collected on an aluminum roller wrapped with sulfate transparent paper, and the polystyrene / polylactic acid spinning fiber of the core-shell structure is obtained. The fiber is uniform in spinning morphology and has a core-shell structure, and the diameter of the fiber is about 2.24-3.55 microns. The method is simple, economical and efficient, has good adjustability in solution preparation and electrostatic spinning processes, is suitable for preparing polystyrene / polylactic acid spinning fibers with core-shell structures capable of loading insect sex pheromones of different types and concentrations, and realizes long-acting slow release of sex information through a polystyrene and polylactic acid dual slow release system. The slow release period of the sex pheromone in the spinning fiber can reach 8-14 weeks, and the sex pheromone can be applied to the aspects of biological prevention and control of neutral pheromone isotropic interference prevention and control of pests for a long time.

The invention relates to a halogen-free flame-retardant flexible bending-resistant low-voltage power cable and a manufacturing method thereof. An insulating layer of the cable is made of a core-shell type nano composite phase change material, a core layer is made of a polyethylene glycol / paraffin phase change material, a shell layer is made of polyurethane or modified polyamide nano fibers and nano SiO2 particles, and the cable is prepared by adopting a coaxial electrostatic spinning technology. According to the structure, stress can be effectively dispersed when the cable is bent, crack propagation is reduced, the temperature is adjusted through the phase change material, and local overheating is prevented. The three-dimensional network structure enhances the bending resistance of the cable, the bending life is prolonged by 40%-60%, and the halogen-free flame retardant performance is ensured at the same time. The technology realizes collaborative optimization of temperature adjustment, stress buffering and bending resistance, and is suitable for power cables with high requirements.

According to the invention, a bicontinuous phase conductive core-shell nanofiber membrane is applied to construction of a flexible neural electrode and a neural conduit, firstly, a bicontinuous phase conductive polymer system is constructed, and the system realizes a three-dimensional network in which an electric phase and a mechanical phase are respectively continuous, interpenetrating but independent; and the long-term technical problems of conductive component agglomeration, conductive path interruption and the like are effectively solved. And preparing the conductive nanofiber scaffold with a core-shell structure by taking a high-molecular polymer as a core layer material and a bicontinuous-phase conductive polymer system as a shell layer material through a coaxial electrostatic spinning method. The construction mode effectively establishes a stable, continuous and uniform electron conduction path, can realize effective nerve electrical stimulation and high-fidelity electrophysiological signal recording in vivo, and can be used as a nerve conduit to regulate and repair related bio-electricity signals in a nerve repair process, so as to accelerate regeneration and repair of nerves.

The invention discloses a sandwich-like fiber diaphragm prepared through three-coaxial electrostatic spinning and a preparation method and application of the sandwich-like fiber diaphragm. The preparation method of the sandwich-like fiber diaphragm comprises the following steps: dissolving a substrate membrane material in a first organic solvent to obtain a middle-layer solution; mixing a solid electrolyte with the binder glue solution to obtain a core layer solution; dissolving a flame retardant in a second organic solvent to obtain a shell solution; and preparing a fiber membrane by utilizing the middle layer solution, the core layer solution and the shell layer solution and adopting a three-coaxial electrostatic spinning technology, and performing hot pressing and drying to obtain the sandwich-like fiber diaphragm. The thickness of the sandwich fiber diaphragm is about 12-14 microns, and the sandwich fiber diaphragm has the characteristics of proper porosity, excellent thermal stability, excellent closed-cell flame retardance, high mechanical strength, high ionic conductivity, low internal resistance of the diaphragm and the like.

The invention belongs to the technical field of preparation of inorganic fiber materials, and provides a preparation method of hollow oxide fibers with reinforced inner walls. Through a coaxial electrostatic spinning method, precursors of a strengthening phase are introduced into an inner-layer spinning solution, and the precursors are promoted to be converted into strengthening materials through high-temperature treatment, so that a strengthening structure is formed in the hollow fiber, and the mechanical performance of the fiber is effectively improved. The prepared various hollow oxide fibers including zirconium oxide, titanium oxide, yttrium oxide, lanthanum zirconate and cerium titanate all show good morphological characteristics, and have excellent flexibility and high strength at the same time. The novel hollow oxide fiber has wide application prospects in multiple fields of heat preservation and heat insulation, electromagnetic wave absorption, sound absorption and noise reduction, high-temperature filtration and the like.

The invention discloses a preparation method of a growth factor gradient bionic scaffold for tendon-bone interface regeneration and repair, and belongs to the technical field of biomedical materials. The composite scaffold is constructed by adopting a coaxial electrospinning and self-assembly technology, and is compounded by a core-shell oriented nanofiber layer and a non-oriented nanofiber layer through a gelatin adhesive to respectively simulate tendon phase and bone phase structures of a tendon-bone interface; a shell layer of the tendon-phase-simulated core-shell oriented nanofiber is a PCL layer containing CTGF, a core layer of the tendon-phase-simulated core-shell oriented nanofiber is a PVA layer containing TGF-beta1, and a bone-phase-simulated non-oriented nanofiber layer is a PCL / Gel co-spun layer containing BMP-2 polylactic acid microspheres and nano-hydroxyapatite. The scaffold can realize secondary controlled release of early-stage release of CTGF, slow release of TGF-beta1 in the middle and later periods and continuous release of BMP-2, and cooperates with a fiber orientation structure to induce graded differentiation of mesenchymal stem cells and promote integrated repair of a tendon-bone interface gradient structure, so that the problems of poor healing of a tendon-bone interface and high repeated fracture rate in a traditional repair method are solved, and the scaffold has good application prospects. The important application value is realized in the field of tendon-bone injury treatment in sports medicine.

The invention provides a biological vascular stent material and a preparation method thereof, and belongs to the technical field of biomedical materials. The polylactic acid-polyvinyl alcohol emulsion is used as a skin layer spinning solution, a sodium alginate solution containing exosomes is used as a core layer spinning solution, a composite material is prepared through a coaxial electrostatic spinning technology, and the biological vascular stent material is obtained in cooperation with a post-treatment process, so that the porosity of the material is effectively improved, and the biological vascular stent is prepared. Meanwhile, the elongation and the supporting force of the intravascular stent are increased.

The invention provides hollow silicon dioxide nanofiber aerogel as well as a preparation method and application thereof, and belongs to the technical field of aerogel. The hollow silicon dioxide nanofiber is prepared by using a coaxial electrostatic spinning method, the cohesiveness of the hollow silicon dioxide nanofiber is improved by using an organosilane cross-linking agent, and the hollow silicon dioxide nanofiber aerogel is prepared by using a vacuum freeze-drying method. According to the method disclosed by the invention, the toughness of the silicon dioxide nanofiber aerogel is enhanced by 125%, the rebound resilience is good, and the prepared silicon dioxide nanofiber aerogel has low density (the density is as low as 0.018 g / cm < 3 >), low heat conductivity coefficient (0.031 W / (m.K)) and high-temperature heat insulation performance, and is expected to be widely applied to the fields of high-temperature heat insulation, liquid hydrogen heat insulation, noise prevention and the like.

The invention relates to the technical field of medical protection materials, and discloses an anti-allergy skin-friendly operating kit and a preparation technology, and the composite material of the operating kit comprises the following components by mass: 40-70 parts of cellulose-based non-woven fabric; 1 to 10 parts of polymethacryloyloxyethyl phosphorylcholine which is covalently grafted to the cellulose-based non-woven fabric; 20 to 50 parts of polylactic acid-quaternary ammonium salt copolymer; 5 to 15 parts of a polyurethane hot melt adhesive; the method comprises the following steps: grafting a PMPC molecular brush on the surface of a cellulose-based non-woven fabric to obtain a skin-friendly layer; carrying out coaxial electrostatic spinning and solvent treatment on the polylactic acid-quaternary ammonium salt copolymer to prepare a hollow nanofiber barrier layer; and finally hot-pressing and compounding the two layers through a polyurethane hot-melt adhesive. According to the invention, allergy is solved through surface grafting; the toxicity is avoided by using an intrinsic antibacterial polymer; the hollow fibers and the net film are compounded, so that the contradiction between water resistance and breathability is overcome, and the biological safety and comfort of the material are improved.

The invention relates to the technical field of flexible sensors, and particularly discloses breathable ion skin which comprises water, a polymer, a liquid crystal and a conductive ion active substance. The material with unique soft elasticity is prepared by combining the orderly-oriented liquid crystal material and the polymer elastomer, the excellent adhesion stability can be kept under the cyclic load, and the stripping interface toughness is high. The composite fiber membrane of a liquid crystal elastomer core-ion skin shell structure is prepared through coaxial electrostatic spinning, the liquid crystal elastomer core provides good structural stability and adhesion stability, the ion skin shell provides good signal detection capacity, and meanwhile, the porous membrane structure prepared through electrostatic spinning has the ultrahigh water vapor permeability and can be used for preparing the composite fiber membrane of the liquid crystal elastomer core-ion skin shell structure. Sweat generated at the contact site of the ion skin and the human skin can be quickly volatilized, sweat accumulation is reduced, and the human skin does not have inflammatory response after the ion skin is worn for a long time.

The invention discloses a magnesium oxide coaxial electrospun bone biological material tensile strength and elongation detection device, and belongs to the technical field of material detection.The magnesium oxide coaxial electrospun bone biological material tensile strength and elongation detection device comprises a clamping mechanism, loading mechanisms are connected to the two sides of the clamping mechanism, the device further comprises a detection mechanism for detecting the elongation, and the clamping mechanism comprises a first side plate and a second side plate; the lower side of the first side plate is rotationally connected with a guide rod, a guide sleeve is rotationally arranged on the second side plate, and the guide rod is slidably inserted into the guide sleeve; a first bearing plate and a second bearing plate are arranged on the first side plate and the second side plate, a first sliding way and a second sliding way which are symmetrically arranged are arranged on the first side plate and the second side plate correspondingly, a pressing rod is slidably connected into the first sliding way and the second sliding way, a first pressing block is fixedly connected to the lower side of the pressing rod, and a second pressing block is slidably connected to the pressing rod. And the upper end of the pressing rod is connected with a hydraulic driving rod. The device has the advantages of fast clamping and multi-angle composite loading.

The invention belongs to the field of biosensing and microbiological detection, and relates to a staphylococcus aureus rapid counting method based on fluorescence confinement discretization. According to the method, oat bran is used as a natural carbon source, lysozyme active fragments are used as targeting ligands, targeting carbon quantum dots are synthesized through a one-step hydrothermal method, the targeting carbon quantum dots are modified by fluorescent dye SRB to obtain luminescence enhanced carbon quantum dots, and the luminescence enhanced carbon quantum dots can be specifically combined with cell walls of staphylococcus aureus, so that the staphylococcus aureus has stable fluorescence signals. And then, by taking the marked thalli as a core layer and a high-molecular polymer as a shell layer, preparing a core-shell nanofiber membrane by adopting a coaxial electrostatic spinning technology to realize spatial confinement and monomer discretization of the thalli, so that a group fluorescence signal is converted into a single-thalli distinguishable signal, and rapid and sensitive quantitative detection of the staphylococcus aureus is realized. The method is simple, convenient, high in sensitivity, suitable for rapid visualization and quantitative detection of staphylococcus aureus in foods such as dairy products, meat products and beverages, and wide in application prospect.

The embodiment of the application discloses a kind of bone repair materials and its preparation method and application.The preparation method includes: poly-L-lactic acid and barium titanate are added in hexafluoroisopropanol, fully stir, obtain PLLA / BTO suspension;Poly-L-lactic acid is dissolved in hexafluoroisopropanol, then add catalpol, obtain PLLA / CA solution;With the PLLA / BTO suspension as shell material, PLLA / CA solution as core material, coaxial electrospinning is carried out, to obtain composite nanomaterial, then remove solvent, obtain the bone repair material.The bone repair material of the application not only has higher anti-osteoporosis activity, but also can improve the stability of the material (low degradation rate, long complete degradation time) and enhance the piezoelectric effect, achieve excellent osteoporosis bone defect repair effect;Preparation process is relatively simple and convenient, key technology is easy to control, and manufacturing cost is lower.

The invention relates to the field of preparation of mullite materials, in particular to a method for preparing mullite porous hollow microspheres by an electrostatic spinning technology. The method for preparing the mullite porous hollow microspheres by the electrostatic spinning technology comprises the following steps: mixing an inner-layer polymer with a first solvent to obtain an inner-layer polymer solution; mixing the mullite precursor with a second solvent to obtain an outer layer polymer solution; performing electrostatic spinning on the inner-layer polymer solution and the outer-layer polymer solution by adopting a coaxial electrostatic spinning technology to obtain precursor microspheres; carrying out curing heat treatment on the precursor microspheres to obtain cured and crosslinked precursor microspheres; calcining the cured and crosslinked precursor microspheres, so as to obtain mullite porous hollow microspheres; wherein the humidity of the electrostatic spinning is 30-60%. According to the invention, the porous structure and hollow structure combined mullite microspheres are prepared by adopting an electrostatic spinning technology, and a new method is provided for preparation of the porous hollow mullite microspheres.

The invention belongs to the technical field of anticorrosive and antibacterial coatings, and particularly relates to a self-repairing antibacterial anticorrosive coating and a preparation method thereof. The core-shell structure nanofiber membrane with a high polymer material as a shell and a metal corrosion inhibitor as core liquid is prepared by adopting a coaxial electrostatic spinning technology. An epoxy resin coating is sprayed on an iron sheet in advance, the sprayed epoxy resin is subjected to low-temperature pretreatment to be in a semi-solidified state, and a core-shell structure nanofiber membrane is attached to the pretreated epoxy resin coating; and finally, spraying the epoxy resin containing the antibacterial agent and the antibacterial agent ethanol solution on the surface of the fiber membrane again to prepare the composite coating with a sandwich structure. The prepared composite coating has good antibacterial ability, after the iron sheet coating is damaged, the anti-corrosion coating can rapidly release an anti-corrosion healing agent to rapidly repair the damaged part of the coating, and the composite coating has efficient self-repairing anti-corrosion ability and has good application prospects in the anti-corrosion field.

This invention relates to a filter membrane and its preparation method, particularly to a platelet-rich suspension leukocyte-removing filter membrane and its preparation method. The method uses polyethersulfone (PES) material, which has stable mechanical properties, heat resistance, and chemical properties, as the core material, and polylactic acid (PLA) material, which has good biocompatibility and safety, as the outer material. A coaxial electrospinning process is employed to prepare the PES-PLA filter membrane. Furthermore, a vinylpyrrolidone-acrylamide copolymer is grafted onto the surface of the PES-PLA filter membrane. The resulting platelet-rich suspension leukocyte-removing filter membrane has a narrow pore size distribution, high porosity, and good hydrophilicity, biocompatibility, and antibacterial properties. It can effectively filter out leukocytes from platelet suspensions and reduce the risk of bacterial contamination.