196 results about "Nanofiber composites" patented technology

The invention discloses a preparation method of a cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel composite pressure sensing material. The preparation method comprises the following steps: (1) preparing a cellulose acetate and thermoplastic polyurethane spinning solution; (2) preparing a cellulose acetate / thermoplastic polyurethane composite nanofiber membrane; (3) preparing cellulose acetate / thermoplastic polyurethane short nano dispersion liquid; (4) preparing a cellulose acetate / thermoplastic polyurethane / polypyrrole polymerization solution; and (5) preparing the cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel. According to the preparation method, a high-temperature thermal annealing process is not needed, and the prepared nanofiber composite aerogel has high conductivity, ultralow volume density, high compression deformation performance and high pressure resistance sensing sensitivity.

The invention discloses a high-entropy alloy silicon carbide nanofiber composite material and a preparation method and application thereof, a high-entropy alloy is loaded on silicon carbide nanofibers, compared with a carbon fiber material carrier, SiC fibers can form a compact SiO2 protective layer in a high-temperature aerobic environment, further oxidation failure of the internal structure can be prevented, and the high-entropy alloy silicon carbide nanofiber composite material is prepared. And meanwhile, SiC also has relatively high high-temperature stability and weather resistance, so that the high-entropy alloy silicon carbide nanofiber composite material can stably work in an extreme high-temperature oxidation environment (such as a spacecraft thermal protection system and an engine tail gas pipeline) of over 1000 DEG C, and perfectly adapts to a high-temperature wave-absorbing scene.

The invention discloses a preparation method and application of three-dimensional intercalation multidirectional conductive MXene-based aerogel, and relates to the technical field of advanced electrochemical energy storage materials and devices. According to the MXene / conductive polymer and nanofiber composite aerogel developed by the invention, the two-dimensional conductive material, the pseudocapacitance polymer and the high-performance nanofiber are integrated in a three-in-one manner, so that collaborative optimization of conductivity, the number of active sites and structural stability is realized, and inherent defects of a single-component material are fundamentally avoided; and a universal solution is provided for solving the industrial problem of unbalanced performance of the electrode material.

The invention belongs to the related technical field of flexible electrodes, and discloses a preparation method, a product and application of a high-temperature-resistant flexible metallized ceramic nanofiber composite electrode. The method comprises the following steps: carrying out electrostatic spinning on electrostatic spinning sol doped with an organic polymer to obtain a precursor of a flexible ceramic nanofiber membrane; carrying out primary high-temperature calcination on the precursor to remove the doped organic polymer so as to obtain a flexible ceramic nanofiber membrane; growing and coating a metal conductive layer on the surface of the flexible ceramic nanofiber membrane to obtain an electrode precursor; and carrying out secondary high-temperature calcination on the electrode precursor to obtain the required composite electrode. The invention also discloses a product obtained by the preparation method and application. According to the invention, the problem that the flexible sensor is not resistant to high temperature is solved.

The invention belongs to the field of battery diaphragms, and particularly provides a preparation method of a solid electrolyte composite material, which comprises the following steps: (S1) mixing a polymer, a plasticizer and a lithium salt, adding into a second solvent, dissolving and stirring to obtain an electrostatic spinning precursor solution; (S2) depositing the electrostatic spinning precursor solution on the surface of a receiver through electrostatic spinning to obtain a fiber membrane, and separating the fiber membrane from the receiver; and (S3) soaking the fiber membrane in a dispersion liquid, and performing dispersion treatment to obtain the nanofiber composite material, specifically, a battery prepared from the solid electrolyte composite material provided by the invention has excellent electrochemical performance, can still maintain a high capacity retention ratio after multiple cycles, has excellent rate capability, and can be applied to the field of lithium ion batteries, such as lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries and lithium ion batteries. And the long-term stability and safety of the operation of the battery can be ensured.

The present invention relates to the technical field of air purification, and particularly provides a nanofiber composite air purification filter material and a preparation method therefor. The nanofiber composite air purification filter material comprises a composite structure consisting of four layers arranged from top to bottom, which are respectively a non-woven fabric, a nanofiber membrane layer, a modified melt-blown non-woven fabric and a spunbond non-woven fabric; the non-woven fabric is PET needle-punched non-woven fabric; in parts by weight, the raw materials for preparing the nanofiber membrane layer comprise: 10-20 parts of polylactic acid, 3-5 parts of a reinforcing agent, 2-4 parts of modified nanoparticles and 100-150 parts of a solvent; and the spunbond non-woven fabric is made of PET or PP. The nanofiber composite air purification filter material provided by the present invention has air-permeability, radiation resistance, and antibacterial properties, can be widely applied in the field of air purification filter materials, and has considerable commercial application value.

The invention relates to a covalent organic framework modified cellulose nanofiber composite diaphragm which is characterized in that cellulose nanofiber is used as a matrix, an amide type or amine type covalent organic framework layer is grown on the surface in situ, the loading capacity of a covalent organic framework is regulated and controlled, and a hierarchical pore structure with gradient pore diameter is constructed; the preparation method comprises the following steps: synthesizing a covalent organic framework precursor bonded with an imine bond on the surface of cellulose nanofiber in situ by a one-pot method under an acidic mixed solution and a heating condition, and regulating and synchronously reducing to convert into an amine type covalent organic framework; or after the imine bond bonded covalent organic framework is synthesized in two stages, the imine bond bonded covalent organic framework is selectively converted into an amide type covalent organic framework through oxidation modification; the obtained cellulose nanofiber compound coated with the covalent organic framework is subjected to the processes of film forming, solvent replacement, supercritical drying and the like, and the composite diaphragm is obtained; the diaphragm has excellent electrolyte wettability, high liquid absorption rate, good ionic conductivity and thermal stability, and can promote uniform transmission of lithium ions and inhibit growth of lithium dendrites.

The invention discloses a high polymer / nanofiber composite material with high mechanical property and high weather resistance as well as a preparation method and application thereof, and belongs to the technical field of polymer / nanofiber composite materials. According to the invention, polyether polyol participates in a prepolymerization reaction and is used for preparing a high-molecular polymer from modified nanofibers, and in the reaction process of a curing agent and isocyanate, the modified nanofibers and organic silicon are used as reinforcing phases to be added into the high-molecular polymer; the mechanical property, the weather resistance, the hydrophobic ice resistance, the chemical corrosion resistance and the wear resistance of the high-molecular polymer material are improved. The high polymer / nanofiber composite material with high mechanical property and high weather resistance provided by the invention is suitable for rain erosion protection of wind power blades. The preparation process is simple and efficient, the tensile strength, the elongation at break and the impact strength of the prepared high polymer / nanofiber composite material are remarkably enhanced, and the high polymer / nanofiber composite material is environment-friendly.

This invention provides an in-situ polymerized yarn and its preparation method, relating to the field of yarn textile technology. The preparation method of this in-situ polymerized yarn includes the following steps: S1. Mixing a polymer, solvent colorant, and complexing agent in a specific ratio to obtain a spinning solution; S2. Simultaneously performing electrospinning, carding, and embedding to obtain a colored nanofiber / cotton composite sliver; S3. Drawing and spinning the sliver to produce yarn. By using colored nanofibers composited with a cotton web, the finishing process is eliminated to reduce contamination. The selection of polydimethyldiallyl ammonium chloride as a complexing agent in the spinning solution increases the volume occupied by the cross-linked structure formed by the complexing agent and dye, enhancing the cohesion with the polymer and improving its color fastness.

The invention discloses a rare-earth-based soil remediation catalyst as well as a preparation method and application thereof. The catalyst takes a composite oxide of micron-sized aluminum oxide and titanium dioxide as a carrier, a nano-fiber composite oxide of cerium oxide and copper oxide as an active component and a nano-particle composite oxide of iron oxide and manganese dioxide as a cocatalyst; on the basis of the mass of the carrier, the mass percentage of the active component is 5-10%, and the mass percentage of the cocatalyst is 3-6%. The catalyst synthesized through the method has the advantages of being good in soil compatibility, high in catalytic efficiency and the like, and the target of low-energy-consumption remediation of organic pollutant soil can be achieved.

The present invention belongs to the field of preparation of nanofiber composite fabrics. The present invention provides a nanofiber high moisture permeability waterproof fabric with multi-level interconnected channels and a preparation method thereof. The fabric body includes an outer layer, an intermediate layer and an inner layer. The outer layer is a pure polyester waterproof fabric that has been waterproofed, the intermediate layer is a nanofiber membrane with multi-level interconnected channels, and the inner layer is a pure polyester fabric; the inner side of the outer layer of pure polyester waterproof fabric is bonded to the hydrophobic polyvinyl alcohol nanofiber membrane of the intermediate layer of nanofiber membrane with multi-level interconnected channels through hot melt adhesive compounding, and the inner layer of pure polyester fabric is bonded to the hydrophilic polyurethane nanofiber membrane of the intermediate layer of nanofiber membrane with multi-level interconnected channels through hot melt adhesive compounding. The nanofiber membrane with multi-level interconnected pores in the middle layer is composed of multiple nanofiber membrane layers stacked in sequence. Each nanofiber membrane layer has two layers of nanofiber membranes with different fiber diameters, one layer is a hydrophilic polyurethane nanofiber membrane, and the other layer is a hydrophobic polyvinyl alcohol nanofiber membrane. The nanofibers of the two membranes between and within the multi-level nanofiber membrane layers are cross-connected to form a three-dimensional structure with multi-level interconnected pores. The pore size gradually decreases from the hydrophilic polyurethane nanofiber membrane to the hydrophobic polyvinyl alcohol nanofiber membrane. The moisture permeability is higher than 15000g / (m 2 24h), the hydrostatic pressure is higher than 60kPa.

The invention belongs to the technical field of flexible electronics, and relates to a flexible piezoresistive sensor based on an MXene multilevel heterostructure and a preparation method of the flexible piezoresistive sensor. The method comprises the steps that MXene nanosheets are attached to the surface of a thermoplastic polyurethane nanofiber substrate through electrostatic self-adsorption, a nanofiber composite layer is obtained, UIO-66-NH2 is dispersed in the thermoplastic polyurethane nanofiber substrate, and the surface of the thermoplastic polyurethane nanofiber substrate is modified with a first chitosan modification layer; the MXene nanosheets are embedded into the three-dimensional network of the polyurethane foam skeleton through dipping and extruding operation, a porous foam composite layer is obtained, and the surface of the polyurethane foam skeleton is modified with a second chitosan modification layer; and combining the nanofiber composite layer and the porous foam composite layer through a conductive adhesive containing silver paste, and carrying out packaging treatment to form the MXene multistage heterostructure with tightly combined interfaces. Based on the method, through the synergistic effect of the multistage heterostructures, high sensitivity, wide pressure detection range and high stability are realized at the same time.

The invention relates to the technical field of all-vanadium redox flow battery electrodes, and discloses a spinel nanofiber composite graphite felt electrode and a preparation method thereof, and the preparation method comprises the following steps: graphite felt pretreatment; preparing a spinel precursor solution; preparing spinel nanofibers; performing surface reconstruction treatment; preparing a composite graphite felt electrode; by regulating A-site and B-site metals of spinel, the conductivity of the composite graphite felt electrode is improved, activation polarization and ohmic polarization are reduced, energy loss generated by side reaction in battery operation is reduced, and through surface reconstruction, the spinel structure is stabilized, meanwhile, the surface roughness of nanofibers is increased, the active sites of the electrode are increased, and the conductivity of the composite graphite felt electrode is improved. And the efficiency of the battery is improved.

The application belongs to the field of medical biological materials, and relates to a preparation method of a hierarchical nanofiber composite film for nerve repair and application thereof. The method comprises the following steps: preparing multilayer nanofibers with different internal stresses through continuous multiple electrostatic spinning units, stacking the multilayer nanofibers with different internal stresses to form a composite nanofiber film with an internal stress gradient; chemically crosslinking the composite nanofiber film; performing adhesion molecule adhesion treatment on the upper surface of the composite nanofiber film; and preparing the hierarchical nanofiber composite film with an internal stress gradient and capable of self-deforming under the action of liquid to wrap nerves. The film provided by the application has excellent flexibility, biocompatibility and degradation performance, can efficiently and quickly adhere to the surface of damaged nerves, provides a good support microenvironment for nerve cell growth, promotes nerve regeneration and repair, and has a wide application prospect in the field of peripheral nerve injury repair.

The invention discloses a stealth coating material for aviation aircrafts. According to the invention, a three-layer composite structure design is adopted; the intelligent sensing layer is composed of graphene quantum dots and a piezoelectric nanofiber composite network, so that real-time sensing of electromagnetic wave signals is realized; the tunable metamaterial layer comprises a liquid crystal elastomer matrix and nickel-titanium alloy nanowires dispersed in the liquid crystal elastomer matrix, and electromagnetic parameters of the material are dynamically adjusted by applying an electric field or a temperature field; vanadium dioxide nanoparticles, a photonic crystal structure and carbon nanotube aerogel are integrated in the multispectral stealth layer, and radar, infrared and visible light multispectral synergistic stealth is achieved. The coating is further integrated with a microencapsulation repairing agent and an intelligent control system, and has the self-repairing and self-adaptive adjusting functions. Compared with the prior art, 0.1-40 GHz ultra-wide frequency band radar wave absorption is achieved, the radar cross section is reduced by 25-30 dB, the infrared radiation characteristic is reduced by 80% or above, the surface density is only 1.2-1.5 kg / m, the weight is reduced by 65% compared with a traditional coating, and a key material technical support is provided for a new generation of stealth aircrafts.

The application discloses a kind of MXene modified polyimide nanofiber composite membranes and its preparation method and application, the method is prepared by acid etching method MXene nanosheet and polyamide acid molecular chain form strong hydrogen bond and coordination effect, significantly enhance interface binding force.MXene effectively transmits load, inhibits crack propagation, substantially improves the tensile strength and toughness of composite membrane, while extending the diffusion path of particulate matter, combined with the electrostatic adsorption effect produced by MXene itself conductivity, significantly improve the interception efficiency of PM0.3~PM2.5 fine particulate matter.The thermal imidization process ensures that PI matrix is completely converted into high-temperature-resistant structure, giving the material the ability to operate stably at high temperature for a long time.The composite membrane realizes four breakthroughs of high strength, high efficiency, low resistance and high dust capacity, providing a new solution for high-performance air filtration under harsh working conditions.

The application discloses a kind of superhigh temperature self-adaptive insulated cable of composite and preparation method thereof, which uses carbon nanotube fiber bundle as conductor, multiple layer aerogel-ceramic nanofiber composite felt as insulator, stress buffer layer formed by negative thermal expansion coefficient material is arranged between layers, and the outer sheath is chemical vapor infiltration SiC carbon fiber braided sleeve.The cable of the application has the advantages of ultra-light, high thermal stability, self-adaptive sealing and strong thermal shock resistance, and is suitable for extreme high temperature environment above 800 DEG C;The preparation method includes supercritical drying, pre-stretching winding and other key processes, to realize the high performance and reliability of the cable.

The present invention relates to the field of battery material technology and discloses a preparation method and application of a cobalt phosphide-modified porous carbon nanofiber composite lithium negative electrode and carrier. The preparation method comprises dissolving cobalt nitrate hexahydrate and polyacrylonitrile in an N,N-dimethylformamide solution, mixing and spinning to obtain a cobalt-containing precursor film, wherein the mass ratio of cobalt nitrate hexahydrate to polyacrylonitrile is 1:1.5-3.2; then soaking the film in a methanol solution for 6-24 hours, and then soaking the film in a methanol solution containing a phosphorus source for 1-2 hours, wherein the volume ratio of the phosphorus source to the methanol solution is 1:40-60; and then pre-oxidizing and pyrolyzing the film for 1-2 hours to obtain a porous nanofiber carrier for a composite lithium metal negative electrode. The nanofiber carrier has a porous structure, which facilitates rapid electrolyte transport and uniform lithium ion flux on the negative electrode surface. The negative electrode has good coulombic efficiency and a high cycle number.

A composite nanofiber aerogel (CNA) is formed from aramid nanofibers (ANFs) combined with polyvinyl alcohol (PVA). These nanoscale constituents of the aerogel form 3D networks with high nodal connectivity and strongly welded connectivity joints between fibrils so that the structure has high stiffness and strength compared to other polymeric aerogels and successive breakage of crosslinks at the connectivity nodes affords energy dissipation while maintaining the overall structural integrity. A specific class of CNA with a specific solid content may be used to form a thin firm with a composite nanofiber framework (CNFF) that is useful in the manufacture of kirigami wearable electronics.

The invention relates to the technical field of non-woven fabric coloring, in particular to a non-woven fabric coloring method which comprises the following steps: step 1, pre-treating non-woven fabric to enhance binding force; 2, coloring by combining an electrospinning method with a concave-convex structure; step 3, spraying step by step; 4, directional texture design and concave-convex mold auxiliary forming are carried out; and 5, environment-friendly low-temperature curing and follow-up treatment are conducted. The non-woven fabric is pretreated through plasma surface activation and ultrasonic alternate cleaning to enhance the binding force, and through nanofiber composite spraying, a mixed solution of a high-molecular compound and a coloring agent is sprayed through an electrospinning method, and a fiber layer with a concave-convex shape is formed on the surface of a collecting device; finally, a low-temperature curing technology is adopted, heating at the temperature of 40-60 DEG C or air drying at the room temperature is adopted, energy consumption is reduced, non-chemical structural colors are used for replacing, traditional acidic and disperse dyes are completely abandoned, colors are generated through physical arrangement of colloidal microspheres, waste water pollution is avoided, and therefore the method is good in process effect and high in environmental friendliness.

The invention provides a multi-modified high-nickel ternary positive electrode material, a preparation method thereof and a solid-state battery. The multi-modified high-nickel ternary positive electrode material comprises a high-nickel ternary core, a fast ion conductor coating layer and a polymer ceramic nanofiber composite coating layer, wherein the fast ion conductor coating layer and the polymer ceramic nanofiber composite coating layer are sequentially arranged on the surface of the high-nickel ternary core. According to the multi-modified high-nickel ternary positive electrode material disclosed by the invention, a dual cooperative defense system of the fast ion conductor layer and the polymer ceramic composite layer is constructed, so that the interface problems of surface side reaction, transition metal dissolution and the like are effectively solved, and a bulk phase structure is indirectly stabilized through external constraint and reduction of surface induction factors; therefore, the comprehensive improvement of the capacity, the rate capability and the cycle performance of the high-nickel material under the conditions of high voltage and long cycle is realized.

The application discloses a polymer-assisted exfoliated boron nitride nanosheet / aramid nanofiber composite heat-conducting film and a preparation method thereof. Hexagonal boron nitride is dispersed into sodium carboxymethyl cellulose aqueous solution and hydroxyethyl cellulose aqueous solution respectively to obtain first and second suspensions. Then, the polymers in the suspensions are homogenized and separated under a pressure of 75-90 MPa. The obtained dispersion liquid is mixed with aramid nanofiber dispersion liquid to form a film to obtain the boron nitride nanosheet / aramid nanofiber composite heat-conducting film. In the application, h-BN is introduced into CMC aqueous solution and HEC aqueous solution, and h-BN is exfoliated under a certain pressure. The coating degree of h-BN can be changed by changing the viscosity, and the collision force and shear force of h-BN on the homogenization channel in the homogenization process can be changed, so that BNNS with high aspect ratio and low defects is prepared, the intrinsic thermal conductivity of BNNS is improved, and the thermal conductivity of the boron nitride nanosheet / aramid nanofiber composite film is finally improved.

The application provides a preparation method of a high-sensitivity nanofiber composite bamboo-joint core-spun yarn strain sensor and belongs to the field of wearable flexible sensors. The method comprises the following steps: S1, polyurethane is dissolved in a solvent to prepare a spinning solution, nanofiber / drawing filament composite yarn is prepared through an electric auxiliary core spinning technology, and a stretching device is used to impart deformation to the drawing filament; S2, the composite yarn in the above deformation state is placed in a conductive nanoparticle / polymer dilute solution for immersion; S3, the immersed composite yarn is immersed in water, and a nanoparticle / polymer conductive layer is constructed on the surface of the composite yarn through non-solvent induced phase separation; and S4, the stretching device is removed, and the composite yarn is subjected to heat treatment to obtain a nanofiber composite bamboo-joint core-spun yarn sensor. The sensor has a radial core-shell structure and an axial concave-convex structure, is high in sensitivity, has a stress detection limit as low as 0.01 N, and simultaneously has excellent mechanical properties.

The utility model discloses a nanofiber composite membrane and production equipment, the nanofiber composite membrane comprises a first nanofiber membrane and a second nanofiber membrane which are laminated, the first nanofiber membrane is provided with a first deposition bottom surface and a first deposition surface, and the second nanofiber membrane is provided with a second deposition bottom surface and a second deposition surface. The first deposition surface is attached to the second deposition surface. According to the nanofiber composite membrane, the first deposition surface and the second deposition surface with many flaws are attached to each other, namely in the nanofiber composite membrane, so that the surface of the nanofiber composite membrane is smooth, and the flaws on the first deposition surface and the flaws on the second deposition surface can make up for each other in probability; in addition, the thickness of the first nanofiber membrane and the thickness of the second nanofiber membrane can be reduced, so that the production speed of the first nanofiber membrane and the second nanofiber membrane can be increased, the uniformity of membrane material stacking is improved, and the performance of the nanofiber composite membrane is improved.

The invention discloses a preparation method of a BiOBr / LaNiO3 nanofiber composite photocatalyst, which is characterized in that a perovskite material LaNiO3 prepared by electrostatic spinning is used as a carrier, and BiOBr is loaded on the fiber surface by a solvothermal method to form a heterojunction structure. According to the composite material, separation of photon-generated carriers is promoted through heterojunction of BiOBr and LaNiO3 nanofibers, and the catalytic activity under visible light is remarkably improved. The invention further discloses application of the prepared BiOBr / LaNiO3 nanofiber composite photocatalyst in degradation of rhodamine B. The degradation efficiency of the BiOBr / LaNiO3 nanofiber composite photocatalyst on rhodamine B can reach 93% within 90 min, and after four times of circulation, the composite material shows good circulation stability. The method has the advantages of being low in cost, high in stability, environmentally friendly and the like, and a green solution is provided for organic dye pollution control.

The invention provides an ultra-light and ultra-thin nano-composite thermal fabric as well as preparation and application thereof, and belongs to the technical field of thermal insulation nano-materials. The preparation method comprises the following steps: mixing a polymer, aerogel and an organic solvent, and carrying out electrostatic spinning on an obtained spinning solution by using a sea-island electrospinning method to obtain a silicon-based aerogel and electrostatic spinning nanofiber composite membrane; the composite film and the lining cloth with the adhesive points are subjected to hot-pressing compounding, and the aerogel-compounded electric spinning nanofiber anti-dusting fabric is obtained. The heat conductivity coefficient of the aerogel compounded electro-spinning nanofiber anti-dusting fabric prepared by the preparation method disclosed by the invention is 0.06-0.07 W.m <-1 >. K <-1 >; at the same low temperature, the heat preservation duration is in positive correlation with the film thickness and / or gram weight, the fabric can be customized according to requirements so as to save the cost, and the temperature range of a heat preservation application environment is-20 DEG C to-80 DEG C; the preparation method has the advantages of powder falling prevention, simple process and high efficiency, and shows a good application prospect in the field of novel thermal insulation materials used in an extremely low-temperature environment.

The application provides a silk fibroin nanofiber composite film and a preparation method and application thereof. The preparation method comprises the following steps: preparing a self-supporting film with an ordered and continuous fiber network framework from a silk fibroin nanofiber dispersion liquid, wherein the fiber network framework serves as a reinforcing phase; contacting the self-supporting film with a solution containing a matrix phase and / or a functional phase, so that the matrix phase and / or the functional phase is filled into the fiber network framework of the self-supporting film to obtain a composite precursor film; and extruding the composite precursor film, or extruding and cross-linking the composite precursor film to obtain the silk fibroin nanofiber composite film. The method of the application adopts a time sequence separation strategy of 'first making a framework and then filling', and the self-assembly ordered structure of the silk fibroin nanofiber is completely reserved. The reinforcing phase, the matrix phase and the functional phase in the obtained composite film synergistically act, and the composite film has high mechanical strength, low swelling rate and functional integrability, and can be applied to the fields of implantable medical devices or biosensors.

The application discloses a kind of multistage filtration systems for ultrapure water production process, multistage filtration system includes primary filter device and secondary filter device, RO concentrated water stock solution is sequentially transported to primary filter device, secondary filter device;The inside of primary filter device is equipped with colloidal silica filter material, the inside of secondary filter device is equipped with colloidal iron filter material;Colloidal silica filter material is amino functionalized MOFs nanofiber composite membrane, colloidal iron filter material is nanofiber membrane with surface grafted hydroxamic acid group.The multistage filtration system for ultrapure water production process provided by the application has excellent colloidal silica removal effect and excellent colloidal iron removal effect.

The invention discloses a protein nanoparticle-nanofiber composite material and a preparation method thereof, and belongs to the technical field of food processing and functional protein materials. The method comprises the following steps: (1) taking fresh egg white, diluting and stirring to obtain uniform egg white protein dispersion liquid; (2) performing acylation modification on the egg white protein dispersion liquid to increase surface negative charges and improve conformation flexibility; (3) performing controllable enzymolysis on the acylated egg white protein, so that part of peptide chains of the acylated egg white protein are broken and oligopeptide with self-assembly capability is formed; and (4) carrying out heat treatment on the enzymolysis product, inducing the peptide fragment to be self-assembled to form nano-particles while inactivating the protease through heat treatment, further forming a nano-fiber network dominated by a beta-folding structure, and finally obtaining the protein nano-particle-nano-fiber composite system. Through the synergistic effect of acylation, enzymolysis and heat treatment, accurate conversion of protein from a natural spherical conformation to a functional nanostructure is achieved, and the obtained composite material has the dispersion stability of particles and the network enhancement effect of fibers and has excellent foamability, emulsibility and gelling property.

The application discloses a kind of β-CD / waste polyester electrostatic spinning composite nanofiber membrane and its preparation method and application, CWP spinning solution and β-CD solution are respectively placed in electrostatic spinning machine receiving drum two ends and are prepared with the " honeycomb structure " β-CD / CWP nanofiber composite membrane, its porosity is high, and β-CD is " bowl shape " structure, these special structures are conducive to reduce filtration resistance, improve the removal of particulate matter PM in oil smoke and volatile organic gas COFs, so as to obtain excellent comprehensive filtration performance.Oil smoke detection system is used to test the real oil smoke purification performance of composite membrane (>90%), which is much higher than that of commercially available oil smoke purification materials;After 120 min cycle purification, the purification efficiency is flat with the initial efficiency (>90%), and can be widely used in high-end air filtration, oil-gas separation and other fields.