2607 results about "Pore diameter" patented technology

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The first polyester is contacted with a further organic compound in a volume section V3 to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V3 to obtain a first intermediate mixture. The first intermediate mixture comprises a first intermediate product and the further organic compound. First particulated material is added to the first intermediate mixture in a volume section V4. A filtering means is pre-coated with the first particulated material. At least one impurity is at least partially removed from the first intermediate mixture using the filtering means. The first particulated material has a median pore diameter in the range of 5 mm to 20 mm.

The invention provides a three-dimensional digital core reconstruction method capable of reflecting real shale pore structure characteristics and meeting pore scale numerical simulation connectivity requirements, which comprises the following steps of: firstly, acquiring a pore structure image according to a scanning electron microscope and a micro-nano CT (Computed Tomography); constructing a shale matrix digital core which is consistent with the porosity, permeability and pore size distribution of a real rock sample by adopting a method of combining a numerical value construction method and a physical experiment method; then establishing a digital core of the shale containing the micro-cracks according to the obtained spatial distribution characteristics of the micro-cracks; a matrix digital core and typical micro-crack distribution are combined to obtain a hole-crack structure digital core for pore scale simulation research. The method is reliable in principle, low in cost and accurate in reconstruction result, and solves the technical problems that a digital core obtained by adopting the prior art is poor in connectivity and cannot reflect typical pore characteristics of shale; the method can be used for researching reconstruction of different types of cores and seepage simulation established on a pore scale, and has a good application prospect.

A silicon-carbon material, a preparation method therefor, a secondary battery, and an electric device. The silicon-carbon material comprises silicon-carbon composite particles; the silicon-carbon composite particles comprise a porous carbon material, nano-silicon grains and a silicon carbide material layer; the porous carbon material is provided with through pores, the nano-silicon grains are located in the through pores, and the silicon carbide material layer is partially located on through pore walls; the grain size of the nano-silicon grains is not smaller than the average pore diameter of the porous carbon material. The silicon-carbon material is used as an active material of a negative electrode sheet, thereby improving the cycle performance of batteries.

The invention provides a preparation method of an hourglass type covalent organic framework (COF) composite membrane, and belongs to the field of gas membrane separation. According to the method, covalent organic framework nanosheets with different pore diameters and charge characteristics are utilized to construct the COF composite membrane with a unique hourglass structure through a vacuum-assisted layer-by-layer assembly technology, so that precise regulation and control on H2 and CO2 gas transmission behaviors are realized, and the prepared composite membrane shows remarkable H2 / CO2 separation selectivity and high permeation flux, and has a good application prospect. The chemical stability, the thermal stability and the mechanical flexibility are excellent. The invention provides a novel solution for efficient gas separation and energy storage application.

The invention discloses a charcoal nano lanthanum material capable of synchronously removing organic phosphorus and inorganic phosphorus, and belongs to the field of environmental functional materials. The adsorbent comprises biochar and nano lanthanum loaded on the biochar, wherein the biochar is bamboo biochar; the nano lanthanum is in a La (OH) 3 form, the particle size of the nano lanthanum is 1-250nm, and the loading capacity of the nano lanthanum is 3-20wt%; the pore diameter of the biochar nano lanthanum material is 1-30nm, and the specific surface area is 100-250m < 2 > / g. Compared with a biochar-loaded nano lanthanum composite material in the prior art, the composite material has the inorganic phosphorus adsorption performance and also has the organic phosphorus adsorption effect, and inorganic phosphorus and organic phosphorus can be synchronously removed. According to the charcoal nano lanthanum material, organic phosphorus is adsorbed and removed by regulating and controlling the defect form of lanthanum, especially organic phosphonate can be hydrolyzed and removed, meanwhile, large pore channels of bamboo charcoal are beneficial to diffusion of macromolecular organic phosphorus to action sites of lanthanum, and the adsorption and hydrolysis effects of lanthanum on the organic phosphorus are further enhanced.

The invention discloses an alumina-based catalytic ceramic membrane loaded with high-content ferric oxide as well as a preparation method and application of the alumina-based catalytic ceramic membrane, and belongs to the technical field of inorganic functional ceramic microfiltration membranes and preparation of the inorganic functional ceramic microfiltration membranes. The invention solves the problems that the catalytic action of the existing catalytic ceramic membrane is limited by low catalyst loading capacity, the preparation process is complicated, the cost is high and the like. When the aluminum oxide-based ceramic membrane is prepared, silicon dioxide is added to generate a liquid phase in the sintering process to promote sintering, the catalyst alpha-Fe2O3 is added into the ceramic powder before sintering, the ceramic membrane with the catalytic function is prepared in a one-step forming and co-sintering mode, the preparation process is simplified, and meanwhile the preparation cost is reduced. The content of alpha-Fe2O3 on the surface and in the ceramic membrane is increased, and Fe < 3 + > is utilized to activate crystal lattices to promote sintering. Along with the increase of the addition amount of alpha-Fe2O3, small pores are discharged in the sintering process, pore walls are shrunk, macropores are generated, the pore diameter of the ceramic membrane is gradually increased, and the permeation flux of the ceramic membrane is improved.

The present application discloses a composite separator, a preparation method therefor and a use thereof. The composite separator comprises a polyolefin separator, an adhesive layer coated on one or both sides of the polyolefin separator, and a cellulose film covering the surface of the adhesive layer, wherein the pore diameter of the cellulose film is greater than that of the polyolefin separator. According to the composite separator, the strength and thermal stability of a traditional separator can be improved, and the requirements of liquid absorption and retention are met, so that the performance and the cycle life of an energy storage device are improved.

The invention relates to the technical field of electrode materials, in particular to porous carbon, a silicon-carbon negative electrode material, an electrode plate, a lithium ion battery and an electric appliance. The porous carbon has micropores and mesopores, and the percentage of the pore volume of pores with the pore diameter smaller than 3 nm in the total pore volume is higher than 85%; the percentage of the pore volume of pores with the pore diameter less than 0.7 nm in the total pore volume is less than 15%; the pore size distribution of the porous carbon is in a Koelreuteria-type distribution, and the Koelreuteria-type distribution is that Dv / Dw of a pore size distribution curve is greater than 0.05 cm < 3 >. G <-1 >. Nm <-1 > in a pore size interval of 1-3nm. The porous carbon provided by the invention is micro-mesoporous porous carbon, is distributed in a koelreuteria shape, is low in pore resistance, can improve the silicon loading efficiency, ensures the adsorption capacity and also ensures the de-intercalation of lithium ions, and the silicon-carbon negative electrode material prepared from the porous carbon is high in capacity and efficiency and lower in expansion performance.

The invention discloses a microporous diaphragm for a low-electrical-impedance lithium battery and a preparation method of the microporous diaphragm. The diaphragm comprises: a base film layer, wherein the base film layer is of a microporous structure formed by biaxially stretching polypropylene and / or polyethylene; the surface of the base film layer is coated with the functional coating, and the functional coating contains mixed slurry of inorganic nanoparticles and a binder; the surface modification layer is formed by introducing a hydrophilic electrolyte group on the surface of the functional coating through plasma treatment or chemical grafting. The base membrane layer forms a uniform micropore structure through a two-way stretching process, the functional coating is formed by compounding nano silicon dioxide or aluminum oxide and polyvinylidene fluoride according to a specific proportion, a porous layer with gradient pore diameter is formed, the pore size of the porous layer is smaller than that of the base membrane layer, and efficient permeation of electrolyte is ensured. Electrolyte-philic groups such as sulfonic groups are introduced into the surface modification layer, so that the wettability of the diaphragm to an electrolyte is remarkably improved. During preparation, the base membrane is formed through melt blending, two-way stretching and pore-forming agent extraction, and then the functional layer is constructed through slurry coating and a low-temperature plasma treatment or sulfonation process. The diaphragm combines gradient aperture design, inorganic filler enhancement and surface chemical modification, and realizes low impedance, high thermal stability and excellent mechanical strength.

The invention belongs to the technical field of sound-absorbing materials, and particularly relates to a composite sound-absorbing material as well as a preparation method and application thereof. The composite sound-absorbing material comprises a foaming base material and sound-absorbing particles, the sound-absorbing particles are dispersed in the foaming base material; the foaming base material is a polyurethane material; the sound-absorbing particles comprise at least one of a metal organic framework compound, activated carbon, aerogel, carbon nanotubes and graphene. The sound-absorbing particles are dispersed in the foaming base material, so that obvious concave-convex structures are formed around foam holes of the sound-absorbing material, and the sound wave transmission resistance can be increased. Besides, the sound-absorbing particles with specific types, specific surface areas and pore diameters and porous structures are adopted, the number of internal pore channels is large, multi-angle collision of airflow in the pore channels can be enhanced, and the composite sound-absorbing material has a good sound-absorbing effect at low and medium frequencies.

The present invention belongs to the technical field of porous materials. Disclosed are a fiber porous carbon material, a porous graphite, and a preparation method therefor and the use thereof. The preparation method for the fiber porous carbon material comprises: subjecting a mixture of carbon fibers and a carbonizable and graphitizable organic precursor substance to cold pressing, controlling the density after cold pressing to be 0.7-1.0 g / cm3 or controlling the pressure intensity of cold pressing forming to be 2-80 MPa, and sequentially carrying out carbonization and graphitization after forming, wherein the average length of the carbon fibers is 50-350 μm. The porous material prepared by means of the method has relatively high air permeability, also has a relatively small pore diameter, a relatively uniform pore diameter distribution, a relatively high bending strength and a relatively low heat conductivity coefficient, and can improve the growth quality of silicon carbide crystals when being applied to the growth of the silicon carbide crystals.

The invention provides a collagen freeze-dried product and a preparation method thereof, and belongs to the technical field of biology. In the formula design, through the synergistic effect of the arginine (salt) and the surfactant, denaturation and aggregation of the collagen freeze-dried product in the production process and the storage period are inhibited, the stability of the product is improved, and the prepared collagen freeze-dried product is high in activity, purity and safety. In the freeze-drying process, pre-freezing parameters are optimized, and the nucleation effect of ice crystals in the freezing process of the collagen mixed solution is controlled by regulating and controlling parameters such as temperature and vacuum degree in the freeze-drying process, so that the shapes and the sizes of the crystals in the collagen freeze-dried product are more uniform, the drying time is shortened, and the production efficiency is improved. And the collagen freeze-dried product with uniform pore diameter and excellent appearance is obtained, and the uniformity and stability of batch and inter-batch products are improved.

The invention provides an aramid fiber coated diaphragm, a preparation method thereof and an electrochemical device, and relates to the technical field of battery diaphragms.A coating of the aramid fiber coated diaphragm shows inconsistent pore diameters in the thickness direction, on one hand, dissolved transition metal ions can be blocked and adsorbed, and on the other hand, the aramid fiber coated diaphragm has high porosity; the high liquid absorption and retention capacity of the diaphragm can be guaranteed, the ionic conductivity can be improved, and then fast charging under the high-rate condition is achieved. The invention also provides a method for preparing the diaphragm, and the aperture of the section of the coating layer is differentiated by regulating and controlling the content of the cosolvent, the content of aramid in the aramid stock solution and the steam bath temperature.

The invention discloses a method for characterizing the pore size of the full pore diameter of shale based on combined measurement of a gravimetric method and NMR. The method comprises the following steps: drawing a curve that the pore distribution frequency of a rock sample changes along with the pore diameter; calculating the saturated water porosity of the rock sample based on the weight of the dried rock sample and the weight of the saturated rock sample; based on the saturated water porosity of the rock sample, converting the nuclear magnetic semaphore of the nuclear magnetic resonance T2 spectrum after saturation treatment of the rock sample into a porosity component; based on the porosity component, drawing a change curve of the porosity component and the porosity accumulated value along with the relaxation time T2 after saturation treatment of the rock sample; calculating a space-time conversion coefficient between the nuclear magnetic resonance relaxation time T2 value and the pore size; and based on the space-time conversion coefficient, drawing a full-aperture pore size result graph after saturation treatment of the rock sample on the basis of the change curve of the porosity component and the porosity accumulated value along with the relaxation time T2 after saturation treatment of the rock sample. The phenomenon that the measurement ranges of the pore sizes are overlapped does not exist through multiple simultaneous measurement means, and the obtained full-aperture pore size result is higher in precision.

The invention belongs to the technical field of biomedical engineering, and particularly relates to a single-base resolution laminated two-dimensional material nanopore structure, a DNA sequencing device and a DNA sequencing method. The two-dimensional material nanopore structure comprises an insulating layer and conducting layers arranged on the upper side and the lower side of the insulating layer, through nanopores are formed in the insulating layer and the conducting layers, and the pore diameter of the nanopores is 2-5 nm; the insulating layer and the conductive layer are made of two-dimensional materials. The conductive layers on the two sides serve as upper and lower electrodes, and a power supply is connected between the upper and lower electrodes to form a phase conductive path which is provided with a longitudinal current detection element. A plurality of groups of two-dimensional material nanopore structures are stacked, and meanwhile, a plurality of groups of base pair signals are obtained. According to the invention, the advantages of small thickness, high physical strength and the like of the two-dimensional material nanopore are kept by using a few layers of two-dimensional material films, the vibration of the films is reduced by increasing the number of layers and improving the mechanical strength, so that the signal-to-noise ratio is improved, and the spatial resolution of the nanopore sensor is improved by designing the upper electrode and the lower electrode.

The invention discloses an application of a microporous and mesoporous metal organic framework microsphere material in organic dye and heavy metal wastewater. According to the invention, mesoporous spheres formed by self-assembly of a block copolymer are used as objects, and regular and highly dense mesoporous micron-sized particles of a self-assembled amphiphilic block copolymer (PS-b-PAA) in a selective solvent mixture are used as a template; uiO-66-NH2 and ZIF-67 micron-sized microspheres which are formed by mutual growth of metal-organic framework nanocrystals and have two pore diameters of micropores and mesopores at the same time are produced, and larger carrying capacity is obtained, so that adsorption separation is more efficiently realized. The adsorbent is respectively used for dye adsorption and heavy metal ion adsorption, and the adsorption performance and mechanism of the adsorbent are explored. The metal organic framework microspheres with both micropores and mesopores are used as an adsorbent, and a simpler, more convenient and novel method is provided for adsorption.

The invention discloses a high-specific-surface-area high-nitrogen-oxygen-doped lignin porous carbon material as well as a preparation method and application thereof. The method comprises the following steps: firstly, preparing a supramolecular compound from lignin, magnesium hydroxide, cyanuric acid and melamine through solvothermal reaction, then directly carbonizing to obtain a nitrogen-doped lignin carbon / magnesium oxide compound, and activating the nitrogen-doped lignin carbon / magnesium oxide compound by using weakly corrosive sylvite to increase a micro-mesoporous structure. Therefore, the nitrogen and oxygen doped lignin porous carbon material with ultrahigh specific surface area and rich micro-mesopores is prepared. According to the obtained lignin porous carbon material with the high specific surface area and high nitrogen and oxygen doping, a large number of active sites can be provided due to the high specific surface area, wettability of the carbon material can be improved due to high nitrogen and oxygen doping, the utilization rate of the active sites is increased, and the problem that the pore diameter of the carbon material is not matched with a current carrier is solved due to the rich micro-mesoporous structure; and the specific capacitance of the zinc ion hybrid capacitor is obviously improved.

The invention provides an aggregation-induced emission molecule, a nano motor and a preparation method and application of the aggregation-induced emission molecule, the aggregation-induced emission molecule is used for near-infrared emission, has photo-thermal properties, and has the characteristics of near-infrared II region luminescence, heat production and good light stability; the nano motor is prepared by taking an asymmetric double-mesoporous nano material with different pore diameters as a support material and selectively loading aggregation-induced emission molecules on one side of the support material with a larger pore diameter; under the irradiation of near-infrared light, the aggregation-induced emission molecules with the photothermal effect can form a non-uniform thermal gradient to push the self-thermophoresis movement of the nano motor; tumor sites can be diagnosed and reported under the mediation of near-infrared II region imaging; through the photo-thermal effect, the motor can destroy tumor interstitial cells and degrade tumor matrix components; and in combination with autothermophoresis, blood vessels can be penetrated, so that penetration to the deep layer of the tumor can be realized.

The invention discloses a composite separation membrane for enriching < 6 > Li isotope and application. The composite separation membrane comprises a functional membrane and at least one supporting membrane; the functional film comprises a plurality of pore channels penetrating through the first surface and the second surface of the functional film, and the pore channel diameter of each pore channel is 0.4-0.7 nm; a lithium ion trapping functional group or a macrocyclic compound and a derivative thereof are modified at an inlet of the first surface of the pore channel. The strength of the lithium isotope separation effect depends on the diameter of a pore channel of the composite separation membrane and functional groups modified at an inlet, does not change along with the migration time and the lithium ion migration proportion, and has long-term continuous stability.

The invention provides a silicon-based composite material, a preparation method thereof and a negative electrode. The silicon composite material comprises a porous matrix, silicon nanoparticles and heteroatoms, the porous matrix is provided with a three-dimensional cross pore channel with multistage pore diameters, the pore channel contains at least one silicon nanoparticle, the heteroatoms at least partially coat the surfaces of the silicon nanoparticles, and / or the heteroatoms are spaced among the silicon nanoparticles. According to the silicon-based composite material provided by the invention, the porous matrix is adopted as a substrate material to load the silicon nanoparticles and the heteroatoms doped in the silicon nanoparticles, and the silicon nanoparticles are separated and bound by doping the heteroatoms in the silicon nanoparticles, so that the size and distribution of the silicon material in pore channels are controlled; the silicon material is uniformly dispersed in the three-dimensional crossed pore channels of the porous matrix, so that the volume effect of silicon in the charging and discharging process is effectively relieved, the collapse of the composite material structure caused by the expansion of lithium-intercalated silicon is prevented, and the cycling stability of the electrode is improved.

The invention discloses a silicon-carbon material and a preparation method and application thereof, belongs to the technical field of negative electrode materials, and overcomes the defect of high volume expansion rate of a silicon-based material in the prior art. The silicon-carbon material provided by the invention comprises porous carbon and silicon deposited in porous carbon channels; the porous carbon comprises mesopores and macropores, the pore diameter of the mesopores is greater than 10nm and less than or equal to 50nm, and the pore diameter of the macropores is greater than 50nm and less than or equal to 100nm; based on the total volume of the pores in the porous carbon, the volume fraction of the mesopores is 50%-75%, and the volume fraction of the macropores is 10%-20%; and the silicon deposited in the mesopores and the macropores is a hollow silicon nanotube. Silicon in the silicon-carbon material mainly exists in the form of hollow silicon nanotubes, and during lithium intercalation expansion, since expansion spaces are reserved in the hollow nanotubes, the lithium intercalation expansion of the whole silicon-carbon material is reduced.

The invention discloses a method for determining the critical safety diameter of an emulsion drop of a liquid energetic material synthesis reaction conveying pipeline, which comprises the following steps of: curing and heating a sampled emulsion, determining pyrolysis kinetic parameters of the detected emulsion, constructing a heat production and heat transfer heat insulation system model of a mixed solution of an acid ester emulsion and the emulsion drop by utilizing Comsol, and determining the critical safety diameter of the emulsion drop of the liquid energetic material synthesis reaction conveying pipeline. Calculating a temperature rise change rule of the mixed liquid heat insulation system under different emulsion droplet sizes, determining a function relationship between the emulsion droplet particle size and the temperature rise of the mixed liquid heat insulation system, and deriving to obtain the critical safety diameter of the emulsion droplet; the method comprises the following steps: adsorbing emulsified liquid by using a porous particle material, testing whether the emulsified liquid explodes due to collision and friction of emulsified liquid with different pore diameters at different rates in an impact tank-piston device to obtain the relationship among the movement rate of emulsified liquid drops, the particle size of the emulsified liquid drops and the explosion risk, and determining the explosion risk of the emulsified liquid drops under a specific conveying speed condition according to the relationship. The liquid energetic material is used for synthesizing the optimal size of emulsified liquid drops in a reaction mixed solution.

A water rocket delayed separation device comprises an upper connector, the upper connector is connected with a superior water rocket body, a breather pipe penetrates through the upper connector, extends downwards and penetrates through a lower connector, the lower connector is connected with a subordinate water rocket body, the breather pipe is sleeved with a separation hose, and a one-way air valve is arranged at the lower end of the separation hose. A gas storage pipe is arranged outside the separation hose in a sleeving mode, a gas hole is formed in the lower end of the gas storage pipe, the gas storage pipe plays a role in buffering release of other pressure by arranging the gas storage pipe, the gas hole is formed in the gas storage pipe, and therefore the effect of delayed separation can be started, and control over delayed separation time is also achieved by controlling the hole diameter of the gas hole; the device is simple in structure, light in weight and high in separation success rate.

A zirconia-based powder material, wherein [(Vp10-100) / (Vp100-6000)] satisfies the following Formula [1], provided that in a pore diameter distribution determined by a mercury intrusion method, a pore volume in a range of a pore diameter of X nm or more and less than Y nm is taken as VpX-Y:0.4≤[(Vp1⁢0-1⁢0⁢0) / (Vp100-6⁢0⁢0⁢0)]≤1.Formula [1]

The invention relates to the technical field of batteries, in particular to a porous composite diaphragm, a preparation method thereof and a secondary battery. The porous composite diaphragm comprises a base membrane, a first coating and a second coating, the first coating and the second coating are oppositely arranged on the two surfaces of the base film; the first coating layer and the second coating layer comprise a copolymer containing a first monomer unit and a second monomer unit; the first monomer unit contains a cyano group on a side chain, and the second monomer unit contains a carbonyl group on a side chain; in the copolymer, the molar ratio of the second monomer unit is 1-20%; the first coating and the second coating comprise skeleton structures and first-class pore structures formed between the skeleton structures, and second-class pore structures are formed on bodies of the skeleton structures; and the average pore diameter of the first-type pore structure is greater than that of the second-type pore structure. According to the porous composite diaphragm, the lithium ion conductivity can be improved while the bonding performance with a pole piece is improved.

The invention relates to a low-permeability shale gas-water two-phase relative permeability determination method and system, T2 spectrum curves corresponding to different pretreatment modes are obtained based on nuclear magnetic resonance, the moisture occurrence state in sample pores is determined, the pore types of low-permeability shale are divided, and corresponding critical pore sizes are obtained; according to a Hagen-poiseuille equation and gas-water distribution characteristics of different pore types, determining the flow velocity of a gas phase and a water phase in a single shale pore, and determining the corresponding fluid flow in the single pore according to the flow velocity; the total flow of gas-water two-phase fluid in the low-permeability shale pore network is obtained based on the fractal theory, the critical pore diameter and the flow; based on the total flow velocity, the phase permeability of the gas phase and the water phase and the absolute permeability of the low-permeability shale are obtained through the Darcy law, and the relative permeability is determined; and according to the distribution characteristics of the gas-water two-phase fluid in the pores, determining the water saturation of the low-permeability shale, and determining the gas-water relative permeability of the low-permeability shale under different water saturation.

The present invention relates to the field of battery materials, and provides a lithium manganate cathode material coated with lithium triborate and a preparation method thereof. The cathode material is a porous lithium manganate / lithium triborate composite electrode material, which includes porous lithium manganate with a highly connected directional columnar pore structure and a lithium triborate coating covering the pore surface, with a mass ratio of (86.0~92.0):(8.0~14.0), a coating thickness of 600~800 nm, a pore diameter of 45~95 μm, and a porosity of 65~78%. The preparation method includes: preparing a precursor colloidal solution by the sol-gel method, obtaining porous lithium manganate through low-temperature freezing molding and freeze-drying, and forming a cathode substrate through pre-oxidation and high-temperature sintering; subsequently, using vacuum-assisted impregnation, ultrasound, and nitrogen pressure to promote the penetration of the lithium triborate precursor solution, and forming a uniform coating layer through gradient drying and annealing treatment. The present invention significantly improves the crystal structure stability of the cathode material, inhibits manganese dissolution, improves the cycle life and rate performance, and has wide application value.

The invention relates to the technical field of electrochemical energy storage devices, in particular to a silicon-carbon negative electrode material, a negative electrode plate, an electrochemical device and an electronic device, and mainly comprises a core material and a coating material, the core material comprises silicon particles, the coating material comprises a porous carbon material doped with indium particles, and the coating material comprises a porous carbon material doped with indium particles. The average pore size of the coating material ranges from 10 nm to 20 nm, and the porosity of the coating material ranges from 35% to 45%. According to the silicon-carbon negative electrode material provided by the invention, the coating material has the effects of buffering and inhibiting silicon volume expansion, so that pulverization of the silicon-carbon negative electrode material is inhibited, and the problem of volume expansion of a battery is solved.

The invention provides a preparation method of a full-hydrophilic composite material with a pore diameter gradient and a one-way moisture conduction function. A double-layer hydrophilic composite layer with a pore difference structure is prepared by adopting a means of combining an electrostatic spinning process and a spunlace non-woven process, so that the one-way moisture conduction function is realized. The preparation method comprises the following steps: firstly preparing a hemp / viscose spunlace non-woven layer, then preparing a polylactic acid / chitosan nanofiber membrane through an electrostatic spinning process, and finally compounding the hemp / viscose spunlace non-woven layer and the polylactic acid / chitosan nanofiber membrane to prepare the composite material with the one-way moisture conduction function. The two hydrophilic layers with fiber diameter difference and pore size difference are compounded through a double-layer assembly strategy, the composite material with a brand-new structure and a one-way moisture guiding function is constructed, the composite material has a good one-way liquid conveying function, the continuous one-way moisture guiding function is achieved, and the composite material is suitable for large-scale popularization and application. Wide application prospects are realized in the fields of textile clothing, medical and health materials and the like.

The invention discloses a high-air-permeability humidity display film based on optical interference and a preparation process of the high-air-permeability humidity display film. Comprising a substrate layer, a humidity response layer, a middle layer and a hydrophobic layer, wherein the substrate layer is made of a transparent material; a plurality of breathable micropores are formed in the substrate layer; the humidity response layer is a thin film layer which is made of a humidity sensitive material and has the thickness of 50-100 [mu] m, micropores are formed in the humidity response layer, and the pore diameter of the micropores is 0.5-2 [mu] m; the middle layer is a nanofiber membrane, and the fiber diameter of nanofiber is controlled to be 100-300 nm; the density of the middle layers in the length direction is in gradient change so as to control the air permeability of the humidity response layers corresponding to the middle layers with different densities; the hydrophobic layer is made of a transparent and breathable material and provides a good protection effect for the humidity display film. According to the invention, the hydrophilic microporous structure material is adopted, the humidity can be rapidly conducted to the humidity response layer through the multilayer design, instant color change is generated, and the humidity indication effect is more sensitive.