1271results about "Electro-spinning" patented technology

The invention relates to the technical field of multi-layer composite fabrics, and discloses a waterproof moisture-permeable composite fabric based on a bio-based material and a preparation method of the waterproof moisture-permeable composite fabric. The preparation method comprises the following steps: preparing an amino silanized zinc oxide / cellulose nanocrystal composite material, and carrying out mixed condensation polymerization on the amino silanized zinc oxide / cellulose nanocrystal composite material and vanillin cyclic carbonate to obtain an antibacterial agent; castor oil-based polyurethane, an antibacterial agent and a solvent are mixed and then subjected to electrostatic spinning, and after the electrostatic spinning and the pretreated polyester fabric are subjected to hot-pressing compounding, the obtained composite fabric has excellent waterproof and moisture permeable performance and good antibacterial performance.

The invention belongs to the technical field of biomedical engineering, and particularly relates to a biological rotator cuff patch with a double-gradient structure and a preparation method of the biological rotator cuff patch. The preparation method comprises the following steps: carrying out electrostatic spinning on a spinning solution, controlling the rotating speed of a receiving roller to increase at a constant speed in the electrostatic spinning process, and obtaining a nanofiber membrane after electrostatic spinning; l-polylactic acid and D-polylactic acid are simultaneously dissolved in the spinning solution; the minimum value of the rotating speed of the receiving roller is 100-500 rpm, and the maximum value of the rotating speed of the receiving roller is 3000-4000 rpm. The finally prepared biological rotator cuff patch with the double-gradient structure presents an orientation degree gradient and a piezoelectric effect gradient at the same time on the thickness scale, and has mechanical supporting capacity and biocompatibility, and bionic healing promotion of the patch with the gradient structure is achieved.

The invention provides a Janus polylactic acid fiber membrane for cooling and a preparation method of the Janus polylactic acid fiber membrane. The method comprises the following steps: S1, synthesizing silicon dioxide nanoparticles; s2, dissolving silicon dioxide nanoparticles, a surfactant and polylactic acid in an organic solvent to obtain an electrostatic spinning solution A; s3, uniformly dissolving polylactic acid to obtain an electrostatic spinning solution B; s4, preparing an inner layer of the Janus fiber membrane; and S5, preparing the Janus polylactic acid fiber membrane. According to the method disclosed by the invention, the introduction of the silicon dioxide nanoparticles and the spectral selective regulation and control of the fiber diameter enable the polylactic acid fiber membrane to have high infrared emissivity and high sunlight reflection capability, and the wetting gradient of the fiber membrane can be used for rapidly conveying water from the inner layer to the outer layer. The fiber membrane not only has excellent radiation refrigeration effect and rapid moisture absorption and sweat releasing capability, but also has good biocompatibility and degradability, the preparation process is simple, and the fiber membrane is an individual cooling material with wide application prospect.

The present invention proposes a nanofiber composite vehicle air filter paper with a gradient structure and a preparation method thereof, which is used to solve the technical problems of poor bonding strength between nanofibers and substrates and low filtration efficiency in nanofiber filter materials. The present invention uses a preparation process combining electrostatic spinning and electrostatic spraying to prepare a nanofiber composite vehicle air filter paper, which includes an ultrafine nanofiber mesh layer, a nanofiber layer and a filter paper layer arranged in sequence. The present invention has a good effect on PM under industrial standard wind speed conditions. 0.3 The initial filtration efficiency of particulate matter can reach 99.9%, reaching the H12 standard for air filtration materials. More importantly, in the self-cleaning backflush test, after 10,000 backflush tests, the PM 0.3 The filtration efficiency can still be maintained above 90%. This provides a new strategy for high-performance nanofiber filtration materials, which is of great significance to the high-tech, high-quality, green and sustainable development of nonwoven materials and filtration materials.

The invention discloses a preparation method and application of a bimetal organic framework composite fiber membrane, and the preparation method comprises the following steps: 1) adding polyacrylonitrile, an organic ligand and a pore-foaming agent into an organic solvent, uniformly stirring and mixing at room temperature, carrying out electrostatic spinning to obtain primary fibers, and soaking the primary fibers to remove the pore-foaming agent, so as to obtain primary fibers; drying to obtain a polyacrylonitrile nanofiber membrane containing the organic ligand; 2) placing the polyacrylonitrile nanofiber membrane in a mixed solution of bimetallic salt to prepare a fiber membrane containing bimetallic MOF (Co / Zn-MOF) crystal nucleus, and washing the fiber membrane with deionized water for three times; and 3) immersing the fiber membrane into an organic ligand solution, reacting at room temperature, washing with deionized water, and drying to obtain a target product. The antibacterial rate of the bimetallic MOF modified nanofiber membrane prepared by the method in 24 hours can reach 99.5% or above, the removal rate of a common anionic dye solution is 80% or above, and the purpose of efficiently and safely treating industrial wastewater is achieved.

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 present invention relates to an electrospun fiber, a process for preparing the same, a nonwoven fabric comprising the electrospun fiber, as well as corresponding uses and articles. The inventive electrospun fiber comprises a polymer, a surface-reacted calcium carbonate and a pharmaceutically or nutraceutically active ingredient, wherein at least a part of the pharmaceutically or nutraceutically active ingredient is present within the pores of the surface-reacted calcium carbonate. The inventive fibers may be used e.g. in yarns, transdermal patches, intrabuccal patches, implantable textiles, wound dressings and / or medical tapes.

The invention discloses a preparation method of antibacterial fibers and a fabric, and relates to the technical field of textile fabrics. When the antibacterial fiber is prepared, 1, 6-hexanediol, 2-(bromomethyl) diethyl succinate and diethyl 2, 2 ': 6', 2 '-terpyridine-4'-yl phosphonate are polymerized to prepare polyester; the preparation method comprises the following steps: reacting polyester with 7-(dimethylamino) coumarin to prepare modified polyester; the preparation method comprises the following steps: polymerizing maleic anhydride and methyl-vinyl polysiloxane and coating the surface of a phase change microcapsule with the maleic anhydride and the methyl-vinyl polysiloxane to prepare a pre-modified phase change microcapsule; the pre-modified phase change microcapsule and 1-hydroxymethyl-5, 5-dimethyl hydantoin are subjected to a reaction, and a modified phase change microcapsule is prepared; preparing a spinning solution from the modified polyester, the modified phase change microcapsules and copper chloride, performing electrostatic spinning, and performing chlorination finishing to obtain the antibacterial fiber. The antibacterial fiber prepared by the invention has excellent antibacterial, anti-aging, flame-retardant and mechanical properties.

The invention provides a polyvinylidene fluoride-based nanofiber yarn wave-absorbing fabric as well as a preparation method and application thereof, and belongs to the technical field of preparation of wave-absorbing composite materials. The preparation method comprises the following steps: preparing nanofiber yarns or nanofiber core-spun yarns by adopting a conjugate electrostatic spinning technology, directly adding a conductive substance into a spinning solution to form conductive nanofibers, and further coating the nanofiber yarns or the nanofiber core-spun yarns with a PDA shell layer to improve the wear resistance and reduce silver nanoparticles in situ; finally, the yarns are woven into fabric through a weaving or knitting technology, and the fabric is applied to the fields of buildings, electromagnetic protective clothing, flexible electronics and the like. Compared with an existing microwave absorbing material, the fabric-based material is light in weight and good in mechanical flexibility and processability. Fabrics formed of nanofiber yarns or nanofiber core spun yarns facilitate the induction of interfacial polarization and multiple reflections, and can deeply design material properties. The material provided by the invention has better wear resistance, wearability and microwave absorption performance, and is suitable for actual production and application.

The invention belongs to the technical field of biomedical textile materials, and relates to a multi-level artificial dura mater repair scaffold and a preparation method thereof.The main body structure of the repair scaffold is three layers of nanofiber membranes deposited layer by layer and crosslinked through glutaraldehyde, the inner layer is a coaxial nanofiber membrane loaded with minocycline and insulin-like growth factor-1, and the outer layer is a coaxial nanofiber membrane loaded with glutaraldehyde. Wherein the insulin-like growth factor-1 is located in the core layer, and the minocycline is located in the shell layer; the middle layer is a polycaprolactone nanofiber membrane, and the outer layer is a polycaprolactone / hyaluronic acid nanofiber membrane; the inner layer can release minocycline and insulin-like growth factor-1 in a sequential manner, so that the inflammation environment after brain injury can be effectively regulated and controlled, and neural restoration can be promoted; and the outer layer shows an excellent anti-adhesion effect by inhibiting the adhesion and proliferation of fibroblasts, so that the hindrance on nerve regeneration caused by excessive formation of scar tissues is effectively avoided. The middle layer obviously enhances the ability of the stent to prevent leakage of cerebrospinal fluid; and the structural design is exquisite, the preparation method is simple and convenient, and wide market prospects and profound social values are achieved.

The present application discloses an acetylated glucomannan electrospun membrane, and a preparation method therefor and a use thereof. The preparation method for an electrospun membrane of the present application comprises: first adding glucomannan into a mixed solution of pyridine and acid anhydride, carrying out solid-liquid separation after the reaction, collecting a solid phase, adding ethanol for precipitation, and collecting the precipitate to obtain acetylated glucomannan; then dissolving the acetylated glucomannan in a mixed solution of chloroform and N,N-dimethylformamide, and carrying out ultrasonic treatment to obtain an electrospinning solution; and finally, using the electrospinning solution as a raw material, and carrying out electrospinning to obtain an acetylated glucomannan electrospun membrane.

The invention belongs to the technical field of carbon material fibers, and discloses a preparation method of a carbon nanofiber reinforced carbon material fiber fabric, which comprises the following steps: fixing a weakly twisted carbon material fiber tow on an electrostatic spinning nano yarn machine; forming a carbon nanofiber membrane by utilizing electrostatic spinning, uniformly wrapping the carbon nanofiber membrane on a carbon material fiber bundle subjected to weak twisting, then rolling into a shaft, then weaving the rolled fibers into a fabric, and sequentially performing hot pressing and carbonization treatment on the fabric to prepare a carbon nanofiber reinforced carbon material fiber fabric; the weak twisting means that the twisting degree is 5-13 twists per meter. According to the invention, the carbon nanofiber is coated on the carbon material fiber, so that the interface bonding strength between the nanofiber and the carbon material fiber is improved, and then the fabric prepared from the carbon nanofiber is subjected to hot pressing and carbonization treatment, so that the mechanical property, the electrical conductivity and the heat-conducting property of the fabric are further improved; therefore, the composite material has a huge application prospect in the fields of high-performance composite materials, intelligent textiles 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.

Aspects of the disclosure relate to synthetic tissue or organ scaffolds and methods and compositions for promoting or maintaining their structural integrity. Aspects of the disclosure are useful to prevent scaffold damage (e.g., delamination) during or after implantation into a host. Aspects of the disclosure are useful to stabilize tissue or organ scaffolds that include electrospun fibers.

The invention discloses a titanium lithium aluminum phosphate solid electrolyte polymer interface modification method and a preparation method thereof. The method comprises the following steps: firstly, selecting LITFSI (lithium ion conductor), PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene) and DMSO (dimethyl sulfoxide) liquid, and mixing to form PVDF-HFP-based polymer mixed liquid; then, the PAN film doped with titanium lithium aluminum phosphate powder is uniformly coated with the mixed solution through a press coating method, and the PVDF-HFPPAN film is obtained through drying treatment. And cutting the membrane, placing the cut membrane on two sides of a ceramic chip solid electrolyte, assembling an all-solid-state battery, activating at 40-80 DEG C until the polymer is attached to a metal lithium negative electrode and the surface of the solid electrolyte in a gel state, and cooling to finally obtain the solid electrolyte with a PVDF-HFPPAN coated LATP coated PVDF-HFPPAN sandwich structure. The modified solid-state electrolyte membrane can effectively inhibit the interface reaction of LATP on the lithium negative electrode side and enhance the wettability of the positive and negative electrode interface, thereby meeting the cycle performance requirement of the solid-state battery under the normal temperature condition.

The present invention relates to the technical field of flexible electronics, and relates to a breathable and stretchable circuit capable of being activated by imprinting, and a preparation method therefor and a use thereof. The preparation method for the breathable and stretchable circuit capable of being activated by imprinting in the present invention comprises the following steps: dissolving a thermoplastic polymer in a solvent, adding liquid metal particles, and mixing and dispersing to obtain a mixed solution; carrying out electrospinning on the obtained mixed solution to prepare a nanofiber membrane; and using a stamping model having a circuit pattern to stamp the obtained nanofiber membrane so as to obtain the breathable and stretchable circuit capable of being activated by imprinting. The present invention ensures the breathability and the stretchability by using the nanofiber membrane. The liquid metal particles match fibers in diameter, and therefore, liquid metal in nanofibers can be overflowed by means of imprinting to form a conductive path, achieving high-precision preparation of circuits.

The invention discloses an aerogel composite fiber flame-retardant thermal insulation material as well as a preparation method and application thereof, and belongs to the technical field of novel building materials. The aerogel composite fiber flame-retardant thermal insulation material is prepared from the following components in parts by weight: 0.5 to 2.5 parts of SiO2 aerogel particles, 18 to 21 parts of a polymer, 1 to 3 parts of an inorganic flame retardant, 1 to 3 parts of Al2O3 microbeads and 0.9 to 3.2 parts of a cross-linking agent, the SiO2 aerogel particles and the inorganic flame retardant are wrapped in the aerogel composite fiber flame-retardant thermal insulation material, and the Al2O3 microbeads are loaded on the surface of the aerogel composite fiber flame-retardant thermal insulation material. According to the aerogel composite fiber flame-retardant thermal insulation material, the SiO2 aerogel particles and the polymer in specific parts are combined, and the inorganic flame retardant, the Al2O3 microbeads and the cross-linking agent are matched, so that the aerogel composite fiber flame-retardant thermal insulation material has the heat conductivity, the density, the flame retardant property and the mechanical property, overcomes the defects of an existing thermal insulation material, can replace an existing building thermal insulation material, and has a wide application prospect. The industrial application of the aerogel is promoted.

The invention relates to a carbon nanofiber loaded Cu nanoparticle composite material prepared by combining an electrostatic spinning method and a high-temperature in-situ reduction reaction and used as a high-cycle-stability zinc negative electrode coating of an aqueous zinc ion battery. Belongs to the technical field of new energy materials. The prepared composite electrode material is regular in structure and excellent in electrochemical performance. Cu is introduced through a high-temperature in-situ reduction reaction. And after the Cu is loaded with the carbon nanofibers, not only is the slow dynamic process of the bare zinc electrode improved, but also the uniform deposition of Zn < 2 + > on the zinc negative electrode in the embedding / separating process is induced.

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 discloses an anti-ultraviolet waterproof fabric for a casual cap, belongs to the technical field of fabric processing, and is used for solving the technical problem that the waterproof performance and the anti-ultraviolet performance of a fabric for a cap in the prior art need to be further improved. The inorganic cross-linking agent comprises the modified polyurethane layer, the anti-ultraviolet hydrophobic layer and the moisture-permeable lining layer, amino on the surface of the inorganic cross-linking agent serves as a cross-linking group to promote cross-linking of polyurethane chain segments, and the ultraviolet protection effect of the inorganic cross-linking agent and the anti-ultraviolet modified polyurethane and modified liquid cooperate to improve the anti-ultraviolet capacity of the material; the process of electrostatic spinning is promoted, the waterproof performance of the material is remarkably improved through cooperation of the hydrophobic group modified polyurethane and the modification liquid, the adsorption-transfer-desorption process of moisture is formed by the hydrophilic pore channel structure of the lining moisture-permeable layer and the external hierarchical structure, moisture discharge is promoted, and the moisture permeability of the fabric is remarkably improved.

The invention belongs to the technical field of functional composite fibers, and discloses a wear-resistant nanofiber-reinforced protective graphene fiber and a preparation method and application thereof.The wear-resistant nanofiber-reinforced protective graphene fiber comprises a graphene fiber tow and nanofibers, the nanofibers coat the graphene fiber tow in a three-dimensional porous network mode, and the nanofibers coat the graphene fiber tow in a three-dimensional porous network mode. Forming a stress buffer layer; wear-resistant particles are uniformly loaded in the three-dimensional porous network; the preparation method comprises the following steps: fixing the graphene fibers subjected to surface pretreatment on an electrostatic spinning nano-yarn machine, forming a nano-fiber membrane by utilizing electrostatic spinning, uniformly wrapping the graphene fibers subjected to surface pretreatment with the nano-fiber membrane, then rolling into a shaft, and then carrying out hot-pressing roller treatment on the rolled fiber bundle, so as to obtain the graphene nano-yarn. The wear-resistant nanofiber reinforced protective graphene fiber is prepared; the graphene fiber is used for weaving to obtain the graphene fiber fabric. The fiber prepared by the invention and a fabric woven by using the fiber have excellent mechanical properties, wear resistance, electric conductivity and heat conductivity.

A three-dimensional electrospun nanofiber scaffold for use in repairing a defect in a tissue substrate is provided. The three-dimensional electrospun nanofiber scaffold includes a first layer formed by a first plurality of electrospun polymeric fibers and a second layer formed by a second plurality of electrospun polymeric fibers. The second layer is coupled to the first layer using a coupling process and includes a plurality of varying densities formed by the second plurality of electrospun polymeric fibers. The first and second layers are configured to degrade via hydrolysis after at least one of a predetermined time or an environmental condition. The three-dimensional electrospun nanofiber scaffold is configured to be applied to the tissue substrate containing the defect.

The invention discloses an anti-oxidation fiber mask containing tremella aurantialba polysaccharide. The anti-oxidation fiber mask containing the tremella aurantialba polysaccharide is prepared from the following components in parts by weight: 6 to 30 parts of the tremella aurantialba polysaccharide, 10 to 45 parts of micromolecular collagen peptide and 30 to 80 parts of deionized water. The tremella aurantialba polysaccharide mask is prepared from the tremella aurantialba polysaccharide and the small-molecule collagen peptide according to a specific proportion, the tremella aurantialba polysaccharide serves as an exogenous antioxidant nutrient of an organism and can play a role in scavenging free radicals, and in addition, the tremella aurantialba polysaccharide has good biocompatibility and can be better attached to a mask, so that the mask is free of toxic and side effects. The anti-oxidation mask provides required nutrition for skin while resisting oxidation, and plays a positive role in regulating skin micro-ecology.

The invention relates to the field of temperature-adjusting fibers, and particularly discloses a preparation method of a phase-change temperature-adjusting fiber. The phase-change temperature-adjusting fiber is of a core-shell composite structure, a core layer is a lyocell fiber with wood pulp as a raw material, phase-change microcapsules are arranged on the fiber, octadecane serves as a phase-change material, and the phase-change microcapsules are formed by wrapping melamine-formaldehyde resin formed by condensation of melamine and formaldehyde. The outer layer is a shell fiber which is formed by blending polyacrylonitrile and cellulose acetate, the surface of the shell fiber contains structures such as pores, micropores and cracks, and nano titanium dioxide particles capable of absorbing ultraviolet rays are attached to the shell fiber. Experiments prove that the phase-change temperature-regulating fiber not only has a phase-change temperature-regulating function, but also has the effects of ultraviolet resistance, moisture permeability and sweat releasing. The phase-change temperature-adjusting fiber is used as a raw material, and is blended and woven with other fibers to prepare the temperature-adjusting functional fabric.

The invention discloses a preparation method of a visual electro-heating-strain sensing bifunctional flexible device based on hollow conductive nanofiber yarn, which comprises the following steps: firstly, taking water-soluble vinylon as core yarn, and continuously coating elastic nanofiber on the surface of the core yarn through conjugate electrostatic spinning to prepare elastic nanofiber / vinylon composite wrap yarn; then placing the core yarn in a hot water bath to dissolve the core yarn so as to obtain hollow nanofiber yarn; coating conductive treatment and pre-drafting treatment are synchronously carried out on the hollow nanofiber yarn through a roll-to-roll method, and the hollow conductive nanofiber yarn with a wrinkle structure is obtained; multiple pieces of hollow conductive nanofiber yarn are combined and twisted, and heat and moisture setting treatment is carried out to form yarn with an electric heating-strain sensing function; and finally, the surface of the yarn is coated with a mixed solution of waterborne polyurethane and thermochromic microcapsules to form a visual electro-heating-strain sensing dual-function flexible device, and the visual electro-heating-strain sensing dual-function flexible device can achieve collaborative monitoring of human body movement and physiological information and achieve the visual thermal therapy effect at the same time under the low working voltage. The method has a huge application prospect in the field of intelligent textiles.

The present invention provides a preparation method preparation method for three-layer artificial blood vessel and application thereof. The three-layer artificial blood vessel comprise three layers, electrospinning inner layer, dense middle layer and electrospinning outer layer, the three-layer structure is closely combined and difficult to separate. The inner layer with a cytoskeleton-like structure can promote the formation of intima; the dense middle layer can effectively prevent the leakage of biomacromolecules and increase the puncture resistance of the whole artificial blood vessel; and the outer layer can promote the growth of tissue cells and better integrate with tissue. The three-layer artificial blood vessel provided by the invention has excellent blood compatibility, good flexibility, good puncture resistance and interlayer peeling resistance. The preparation method is convenient and is suitable for industrial scale production.

The invention relates to a high-moisture-absorption chemical fiber filament composite hydrogel core-spun yarn and a preparation method thereof.The chemical fiber filament composite hydrogel core-spun yarn is prepared through the steps that hydrogel precursor polymers and chemical fiber filaments serve as raw materials, the chemical fiber filament composite core-spun yarn is prepared through an electrostatic spinning nano core-spun yarn technology, and then the chemical fiber filament composite hydrogel core-spun yarn and a cross-linking agent are subjected to a chemical cross-linking method. The chemical fiber filament composite hydrogel core-spun yarn prepared by the invention has excellent moisture absorption, water permeation and water conduction capabilities, can be used in the field of civil clothing such as work clothes and mountaineering wear, and provides a comfortable and healthy microenvironment for a human body.

The invention relates to the technical field of synthetic fiber manufacturing, in particular to meta-aramid fibrid and a preparation method thereof. According to the preparation method provided by the invention, the meta-position aramid polymer stock solution forms superfine fibers by utilizing an electrostatic dissolving and blowing technology in combination with hot air traction, and the superfine fibers are bonded or dispersed again by performing ultrasonic treatment subsequently, so that the meta-position aramid fibrid with a wide size distribution range is obtained, and the relatively fine fibers can be used as gap filling parts during paper forming; and the fibers with larger sizes provide better bonding capacity during paper forming, and the prepared paper sheet has excellent bonding performance. Tests show that after the meta-aramid fibrid obtained through the preparation method is used for preparing paper products, the tensile strength of the obtained paper products reaches 3 kN / m, the longitudinal elongation reaches 8.4%, the transverse elongation reaches 6.1%, the longitudinal initial tearing strength reaches 12.3 N, the transverse initial tearing strength reaches 8.2 N, and the breakdown strength reaches 26.2 kV / mm.

The invention belongs to the technical field of sensors and intelligent wearable electronics, and discloses a nano-fiber-based composite material with a cobweb structure as well as a preparation method and application of the nano-fiber-based composite material. Preparing a Cu < 2 + >-doped polylactic acid porous nanofiber membrane by utilizing electrostatic spinning, and spraying copper conductive ink in the spinning process; and then hydrogel is sprayed and cross-linked to obtain the nanofiber strain sensor with a cobweb structure. Under the action of strong surface energy of a porous nanofiber interface, the copper conductive ink forms a linear continuous conductive area depending on fiber appearance, a flaky conductive area is constructed by enrichment distribution of the conductive ink at the junction of fibers, and the linear and flaky areas are in network connection in the polylactic acid porous nanofiber membrane. A bionic cobweb structure electric signal transmission structure model is constructed, hydrogel is sprayed to enable the structure to be crosslinked and wound, and the nanofiber-based high-sensitivity strain sensor which is high in toughness, resistant to fatigue and excellent in human skin attaching capacity is obtained. The preparation method is simple, low in cost, high in toughness, resistant to fatigue, excellent in human skin attaching capacity, high in sensitivity and wide in application range, and can be used for physiological health detection and wearable electronic equipment.

The invention relates to the technical field of lithium batteries, in particular to a lithium-loving PCOF-PMIA composite nanofiber membrane and a preparation method and application thereof.According to the preparation method, the lithium-loving PCOF-PMIA composite nanofiber membrane is obtained by means of an electrostatic spinning technology and a room-temperature in-situ growth technology, and the mechanical strength of the fiber membrane is greatly improved; the COF nanoparticles are prepared by a room-temperature stirring synthesis process, and the method has the advantages of mild reaction conditions, simplicity in operation, short time consumption and the like; the lithium-loving PCOF-PMIA composite nanofiber membrane has a uniform net-shaped nanofiber structure, and COF particles on the surface and in the fiber can be effectively connected at the same time, so that the maximum utilization of the COF can be achieved. The PMIA and the PCOF are simultaneously introduced into the composite nanofiber membrane provided by the invention, so that the ionic conductivity and the lithium ion transference number of the solid electrolyte are favorably improved, and the composite nanofiber membrane is expected to be applied to preparation of the solid composite electrolyte.