108 results about "Fiber morphology" patented technology

The invention provides an intelligent evaluation method for mechanical properties of a carbon fiber composite material, and relates to the technical field of material performance analysis, and the method comprises the following steps: evaluating the performance dispersion of a current batch of samples according to a fiber agglomeration area proportion and a carbon fiber monofilament diameter, and comparing the performance dispersion with a preset dispersion threshold, identifying a non-manufacturability discrete risk level; determining the tensile strength value of each sample through a tensile test, performing statistics to obtain a strength mean value and a strength standard deviation, performing matching analysis on the performance dispersion, the strength mean value and the strength standard deviation, and extracting the fiber reinforcement efficiency; performing weighted fusion processing on the fiber reinforcement efficiency and the fiber agglomeration area proportion to obtain a current batch fiber form comprehensive index, comparing the current batch fiber form comprehensive index with a historical batch, and identifying a fiber form change amplitude; and evaluating the quality consistency degree among the batches according to the strength deviation value and the dispersion difference among the batches, and identifying the non-manufacturability discrete source.

The invention discloses a glass fiber reinforced plastic wiredrawing plate and a processing method thereof, the glass fiber reinforced plastic wiredrawing plate comprises a glass fiber reinforced plastic plate matrix, the glass fiber reinforced plastic plate matrix comprises a fiber reinforced matrix layer and a gel coat layer on at least one surface of the fiber reinforced matrix layer; at least one surface of the glass fiber reinforced plastic plate substrate is provided with a wire drawing structure; the fiber-reinforced matrix layer is formed by infiltrating fibers in matrix layer resin, and the fibers in the fiber-reinforced matrix layer are fiber chopped yarns; and any one or combination of fiber continuous yarns, fiber surface felts, fiber felts, fiber stitch-bonded felts, fiber composite felts, fiber cloth, fiber multi-axis cloth, fiber warp-knitted cloth, fiber composite cloth and fiber woven products. By arranging the wire drawing structure, the surface roughness is improved so as to enhance the bonding force, and the pollution and bonding problems caused by mechanical polishing are avoided; the processing method simplifies the process, reduces the cost, does not need complex corona treatment, provides a good contact surface for bonding of the glass fiber reinforced plastic plate and other materials, and guarantees the bonding effect.

The invention discloses an extracellular vesicle optimized by hydrogel as well as a preparation method and application of the extracellular vesicle. The preparation method comprises the following steps: S1, placing stem cells on fiber membrane hydrogel at the density of 1 * 10 < 5 >-1 * 10 < 6 > / cm < 2 > for culture, and collecting a culture solution; s2, centrifuging the culture solution obtained in the step S1 for 5-10 minutes under 500-1000g, collecting supernate, centrifuging for 30 minutes under the centrifugal force of 5000-10000g, collecting supernate, and removing impurities by using a 0.22 mu m microfiltration membrane, so as to obtain the extracellular vesicles, wherein the fibrous membrane hydrogel in the step S1 contains a gel agent, and the gel agent is a combination of 5 to 20 weight percent of methacrylated gelatin and 0.1 to 5 weight percent of methacrylic acid esterified hyaluronic acid. The specially prepared fibrous membrane hydrogel is used as a matrix for culturing the stem cells, the physiological activity of the stem cells is regulated and controlled through fiber morphology, the function of promoting tissue regeneration of the extracellular vesicles is effectively enhanced, complex gene manipulation or chemical loading is not needed, and the operation process is greatly simplified.

The invention relates to a preparation method of an aluminum polycarboxylate precursor and an aluminum oxide fiber, the aluminum polycarboxylate precursor is stable and has good spinnability, and the aluminum oxide fiber keeps complete fiber morphology and stable crystal phase at 1200 DEG C. The preparation method comprises the following steps: by taking aluminum chloride salt as an aluminum source and potassium carboxylate as an organic ligand of aluminum ions, removing chloride ions by utilizing a potassium salt precipitation method to obtain a polycarboxylic acid aluminum precursor; and taking a high-molecular polymer as a spinning aid, obtaining an alumina precursor fiber by virtue of an electrostatic spinning technology or a centrifugal thread throwing technology, and carrying out heat treatment to obtain the alumina fiber. The method has the advantages of simple synthesis process, good sol stability and spinnability, low cost, no environmental pollution in heat treatment and the like. The prepared alumina fiber is stable in crystalline phase and microstructure, complete in fiber form under the high-temperature condition and capable of being applied to the fields of high-temperature heat insulation, catalyst carriers and the like.

A manganese-doped ruthenium dioxide nanofiber material, a preparation method thereof, and an application thereof in alkaline electrocatalytic hydrogen evolution and oxygen evolution at industrial-level current intensity belong to the technical field of controllable preparation of doped metal oxide nanomaterials. In the present invention, a manganese-doped ruthenium dioxide nanofiber material is prepared by two steps of electrospinning technology and calcination in an air atmosphere. The material exists in a uniform fiber morphology as a whole, and the surface is rough. This method is simple and efficient and can be applied to large-scale industrialization. The manganese-doped ruthenium dioxide nanofiber material prepared in the present invention, as a bifunctional electrocatalyst for electrocatalytic water splitting, exhibits excellent hydrogen evolution and oxygen evolution catalytic activities and stability at industrial-level current density, realizes the efficient and stable preparation of clean and green hydrogen energy, solves the disadvantages of low catalyst activity and poor stability in current industry, and provides an efficient solution to the increasingly serious environmental problems, having high practical application and economic value.

The invention discloses a detection method for quantitatively analyzing the skin-core structural degree or structural uniformity of carbon fibers, and belongs to the technical field of carbon fiber detection. The invention aims to solve the problems of complexity, high cost, high requirement and poor precision of the current detection method for the carbon fiber sheath core. The method comprises the following steps: embedding a to-be-detected fiber bundle by taking epoxy resin as a matrix, and sequentially carrying out ion beam cutting and ion beam polishing on an embedded sample by virtue of a focusing mode and a non-focusing mode of an ion beam cutting instrument to obtain a polished sample of which the fiber cross section or longitudinal section is parallel to the surface of the sample. And then observing the fiber morphology under a scanning electron microscope, and carrying out quantitative analysis on the skin-core structure degree according to the axial or radial contrast difference of the fiber in an SEM graph. The detection method combining resin embedding, ion beam'cutting and polishing 'sample preparation and scanning electron microscope observation and analysis is adopted, the process is simple, convenient and rapid, no chemical reagent pollution exists, the sample preparation success rate is high, the detection efficiency is high, and the whole process cost is low.

The present application relates to a kind of superfine alkali earth hexaaluminate inorganic fiber and its preparation method, the diameter of the alkali earth hexaaluminate inorganic fiber described is 0.1 μm-3.0 μm, and it is continuously adjustable in this range, the prepared alkali earth hexaaluminate fiber keeps fiber flexibility in the temperature range of room temperature to high temperature 1300 DEG C, and keeps fiber crystal phase stability and fiber form integrity at high temperature 1400 DEG C.The preparation method is to mix aluminum sol, alkali earth salt, high molecular polymer and dissolve in water to obtain sol, then electrospinning precursor fiber is obtained, and the precursor fiber is obtained by high-temperature heat treatment to obtain alkali earth hexaaluminate inorganic fiber.The present application has low cost, and fiber structure stability is good, has wide application prospect in the fields such as catalyst, catalyst carrier, fiber structure reinforcement, heat insulation and the like.

This invention relates to a rare earth aluminate inorganic fiber and its preparation method, wherein the main crystalline phase of the rare earth aluminate is composed of ReAl. 11 O 18 Composed of ReAlO3 (Re = La, Ce, Pr, Nd), the relative content of the two phases is continuously adjustable within the range of 0–100 wt%. The fiber diameter ranges from 0.2 μm to 6.0 μm. The fiber maintains flexibility under high-temperature conditions from room temperature to 1450℃ and maintains microstructure and crystalline phase stability from room temperature to 1650℃. The preparation method uses aluminum sol as the aluminum source, rare earth salts as the rare earth source, and a polymer as a spinning aid. Precursor fibers are obtained by electrospinning or centrifugation, and the precursor fibers are then heat-treated to obtain rare earth aluminate inorganic fibers. This invention features sol stability, good spinnability, simple preparation process, and low cost. The prepared inorganic fibers have a stable and controllable structure, intact morphology, and good flexibility, showing promising applications in thermal insulation, flexible electronics, flue gas dust removal, and battery separators.

This application provides a method for applying a plant-extracted bioenzyme to paper pulp treatment. Specifically, it involves applying plant-extracted peroxidase to the pre-bleaching delignification treatment of mechanical pulps from bamboo, reeds, and eucalyptus using H2O2. Key parameters in the treatment process, such as enzyme dosage, treatment time, and H2O2 addition, are optimized. The optimal treatment scheme is determined by measuring the total lignin and surface lignin content and fiber morphology of the treated samples. This optimal scheme is more effective in improving the fiber strength and brightness of the treated pulp compared to conventional enzyme treatment methods. Furthermore, molecular docking simulations are performed using a model of the plant-extracted peroxidase and lignin model compounds (LMCs) with different degrees of polymerization to obtain information on the interaction between the enzyme and LMCs, revealing the mechanism of action between peroxidase and lignin. This provides reliable evidence and technical reference for the feasibility of using plant-extracted peroxidase to remove surface lignin from mechanical pulp and promote subsequent H2O2 bleaching.

The present invention provides a nanofiber membrane having dual scale porosity, which is manufactured by a phase separation electrospinning method. The nanofiber membrane is composed of interfibrous pores and surface pores which are interconnected, thereby enhancing air permeability, diffusion rate and filtration performance. The methods employ solvents having different evaporation rates to induce phase separation during electrospinning, resulting in high porosity structures. The nanofiber membranes are suitable for use in air filtration, medical dressings, drug delivery systems, and diagnostic test paper, thereby improving performance characteristics, such as reducing pressure drop, enhancing diffusion, and increasing diagnostic sensitivity. The method enables cost-effective and scalable production while ensuring consistency of fiber morphology.

The invention discloses a capacitive yarn type pressure sensor which is in a yarn or fiber form and is at least provided with a first capacitor and a second capacitor. The first capacitor comprises two electrode layers and a uniform dielectric layer, the second capacitor comprises two electrode layers and a non-uniform dielectric layer, and the second capacitor is provided with at least two capacitor partitions; the capacitance value of the first capacitor and the pressure form a first monotonic function relationship, and the first monotonic function is irrelevant to the pressure applying position; the capacitance value of the second capacitor and the pressure form a second monotonic function relationship, and the second monotonic function is related to the pressure applying position; the magnitude of the pressure is determined through the capacitance value of the first capacitor, and the position of the pressure is determined through the capacitance value of the second capacitor. A double-capacitor hierarchical design is adopted, the first capacitor adopts a uniform dielectric layer to quantify pressure, and the second capacitor adopts a non-uniform dielectric layer to position a pressure position, so that synchronous quantitative detection of a pressure value and an action position is realized.

The invention relates to the field of fiber membrane preparation, in particular to a preparation and test method of a microfiltration composite fiber membrane, which comprises the following steps: preparing a PVA (Polyvinyl Alcohol) solution; accurately and respectively weighing CA and GO, and respectively adding the CA and the GO into the prepared PVA solution to obtain a PVA / CA / GO spinning solution; assembling SVF base cloth on an unwinding mechanism, coating the front end of the base cloth on the surface of a metal mesh curtain above a solution tank, then pouring a spinning solution into the solution tank, and performing electrostatic spinning after adjusting spinning conditions to obtain a composite fiber membrane; the composite fiber membrane is subjected to hot pressing treatment, so that carboxyl on a cross-linking agent citric acid and hydroxyl of a PVA chain are subjected to an esterification reaction, water resistance is improved through structural regulation and control of a PVA polymer, and the microfiltration composite fiber membrane is obtained. According to the invention, the contact area of the cross-linking agent citric acid and PVA is greatly increased, so that the cross-linking effect is more sufficient, and the fiber membrane can maintain a good fiber form after working in water for a long time.

The invention discloses a system for identifying fibers in antibacterial polyester-cotton composite fibers based on graphic data analysis, and the system comprises a composite fiber to-be-detected sample terminal, a dual-channel microscopic imaging terminal, a fiber image preprocessing and segmenting terminal, and a fiber classification and identification terminal. The problem that fiber morphology and texture features cannot be comprehensively obtained in a single imaging mode is solved, the weight of a regularization item is dynamically adjusted by using an adaptive distance regularization level set algorithm, and the problem that a traditional segmentation method is inaccurate in segmentation of a fiber adhesion region is solved. Meanwhile, accurate division and background separation of a fiber region are realized through a deep learning network model and an OTSU adaptive threshold algorithm, and finally, classification recognition training output is performed through multi-feature fusion recombination and by using a support vector machine, so that the problem of low recognition refinement degree in composite fiber recognition is solved, and the recognition precision of the composite fiber is improved. And the recognition precision of the system on the composite fiber is obviously improved.

The invention provides a multilayer aramid fiber high-temperature-resistant material as well as a preparation method and application thereof, and belongs to the technical field of fiber multilayer materials. The multilayer aramid fiber high-temperature-resistant material comprises a dust facing layer, an anti-static layer and a high-strength filtering layer, the dust facing layer is a non-woven fabric made of meta-position aramid fibers and polyolefin elastic fibers, the non-woven fabric is entangled through spunlace reinforced fibers, and the non-woven fabric and the spunlace reinforced fibers form a covalent cross-linked crystal network structure; the anti-static layer is formed by performing low-pressure water needle spunlace on a woven fabric prepared from meta-aramid, para-aramid and conductive fibers in a plain weave structure or a square plain weave structure, and has the characteristics of static electricity prevention, stable structure and high temperature resistance, and the high-strength filter layer is a woven fabric prepared from polyimide filaments in a 2-up 2-down right twill weave structure or a honeycomb weave structure. The high-temperature-resistant material with high filtering efficiency and high strength is prepared by virtue of special fiber morphology and fabric weave.

The invention relates to the technical field of papermaking, and particularly discloses a control system and method for optimizing the beating degree of flat base paper. The system takes'two-dimensional monitoring and multivariable coordinated regulation 'as a core, realizes parallel monitoring by integrating a beating degree sensor, a fiber form analyzer and the like, performs fusion calculation on detection data, and performs synchronous closed-loop control on the beating concentration, the beating pressure and the beating effective power on the basis, so that the pulping efficiency is improved. And finally, fine regulation and control of the fiber fibrillation process are realized. According to the method provided by the invention, the beating degree can be stably controlled in a target interval from 65 degrees SR to 85 degrees SR, and meanwhile, the following two performances are improved: on one hand, fibers are uniformly distributed, and on the other hand, the electrical insulation strength and the mechanical property uniformity of finished paper are remarkably improved. Therefore, the technical bottleneck that according to an existing papermaking pulping process, high-precision, dynamic and refined regulation and control of the pulp degree parameters are difficult to achieve is solved.

This application provides a functional fabric that combines electromagnetic shielding and microwave absorption, and its preparation method, belonging to the field of functional textile technology. The fiber cross-section of the functional fabric is composed, from the inside out, of a core fiber layer, a conductive reflective layer, a microwave absorption layer, and an impedance matching layer. This application effectively integrates a multi-level impedance gradient structure with a fiber structure, achieving efficient expression of electromagnetic shielding and microwave absorption performance in the fiber morphology, while also retaining the flexibility and breathability of the fabric substrate. It has broad application prospects in both civilian and military fields.

This invention discloses a method for modifying fluff pulp, which can effectively increase the porosity between fibers, thereby improving its liquid conductivity. The preparation method includes the following steps: treating different types of softwood pulp boards with ultrasonic waves and 1,2,3,4-butanetetracarboxylic acid (BTCA) crosslinking. Ultrasonic pulverization effectively reduces the bonding force between fibers, while the polycarboxylic acid crosslinking method gives the fibers a large number of pores, improving fiber bulk and fixing fiber morphology. After this treatment, the fiber morphology shows significant curling, twisting, and indentation, thus affecting its liquid conductivity. The fluff pulp modification method of this invention uses commercial softwood pulp boards as raw materials. Through a simple and easy modification method, it effectively overcomes the shortcomings of domestically produced fluff pulp, such as slow absorption rate, long liquid absorption time, and low bulk, thus improving production efficiency.

This invention relates to the field of polyaryletherketone (PBO) composite materials, specifically to a high thermal conductivity PBO composite material and its preparation method. The composite material includes PBO and PAEK materials, with the PBO material existing in the form of continuous fibers. The method includes the following steps: PAEK powder is attached to the surface of activated PBO continuous fibers by electrostatic adsorption to form pre-coated continuous fibers; one or more bundles of pre-coated continuous fibers are arranged closely in parallel along a single direction, and PAEK powder is spot-welded to the fiber surface or multiple bundles of fibers are fixed in a heating environment below the melting point temperature of PAEK but above its glass transition temperature to obtain a unidirectional prepreg; it is woven with a PBO-based fine-structure material, and the resulting composite fabric is laminated and pressed with a PAEK film and then annealed to obtain the composite material. This invention achieves complete wetting of the PBO thermally conductive fiber interface, with a small amount of fiber added and a continuous thermally conductive network, maximizing thermal conductivity.

The invention relates to the technical field of environment-friendly coatings, in particular to an environment-friendly coating based on a plant material and a preparation method of the environment-friendly coating. The environment-friendly coating comprises the following raw materials in parts by weight: 25-40 parts of a plant composition, 20-30 parts of waterborne epoxy ester resin, 10-20 parts of deionized water, 3-8 parts of radix puerariae residues, 5-10 parts of diatomite, 2-5 parts of bentonite, 1-3 parts of a thickening agent, 0.5-2 parts of a dispersing agent and 0.5-2 parts of a defoaming agent. According to the invention, the rich pore structure of the lotus seedpod charcoal powder and the fiber form of the sisal fibers are interwoven with each other, a stable three-dimensional network is constructed in a paint film, and paint film cracking caused by local stress concentration is avoided; meanwhile, the porous characteristic of the resin is cooperated with inorganic fillers such as diatomite and bentonite, the compactness of a paint film is enhanced, the film-forming property of the resin is optimized by the pomelo peel extract powder, the adhesive force of the paint film and a base material is enhanced, the overall flexibility of the paint is improved, and the service life is prolonged.

The present invention relates to the technical field of aluminum matrix silicon carbide foil materials, and specifically to a high-modulus aluminum matrix silicon carbide foil material and its preparation process: S1: Base material preparation, the base material includes slurry and fiber material; the mass ratio of the slurry to the fiber material is 10: (0.2 - 0.4); the raw materials of the slurry include aluminum, silicon carbide, and molybdenum, wherein the mass ratio of aluminum, silicon carbide, and molybdenum is 1: (0.1 - 0.2): (0.02 - 0.04). In the present invention, N,N-dimethylformamide can delay the solvent evaporation rate, and polyvinylpyrrolidone can improve the fiber morphology and avoid the generation of bead-like structures. Finally, the fiber material is obtained through electrospinning treatment. During the electrospinning treatment process, the fiber material can form a nano-scale fiber structure, greatly increasing the specific surface area, which is beneficial to playing a role in enhancing the bonding effect in the foil material, thereby effectively improving the strength and ductility of the foil material.

The invention provides a positive plate of a solid-state battery. The positive plate comprises a positive electrode foil and a positive electrode active material layer coated on at least one side of the positive electrode foil, the positive electrode active material layer comprises positive electrode active material particles, a binder and a conductive agent; the binder comprises PTFE (Polytetrafluoroethylene); the binder has a fibrous structure in the positive active material layer; the length-diameter ratio of the fibers of the fibrous structure is (80-9000): 1. According to the invention, PTFE is selected as the binder and the fiber morphology of the binder is controlled, especially the length-diameter ratio of the binder is controlled to meet (80-9000): 1, so that the coating and fibration wire drawing of the positive electrode and the electrolyte are uniform, the construction of the conductive network is good, the distribution of the conductive network is more uniform and more comprehensive, the prepared positive electrode has good ionic conductivity, and the service life of the positive electrode is prolonged. A solid-state battery assembled by using the positive electrode shows good electrical performance, the ionic conductivity of a positive plate is improved, and the cycle life of the battery is prolonged.

The invention provides a long-acting heat-insulating polyimide fiber and a preparation method thereof, and belongs to the field of polyimide fibers.The long-acting heat-insulating polyimide fiber is prepared by adding pyromellitic dianhydride, 4, 4 '-diaminodiphenyl ether and triethylamine into an N, N-dimethylformamide solvent, conducting condensation polymerization at the preset temperature to obtain a polyamide acid solution, conducting spinning by adopting a centrifugal spinning technology, and obtaining the long-acting heat-insulating polyimide fiber. Auxiliary rods are arranged on the periphery of the centrifugal spinning cup, the polyamide acid fiber of a horizontal layered structure is formed, the fiber is subjected to cyclization reaction in an oxygen-containing environment, the curvature radius of the fiber is regulated and controlled through the oxygen concentration, and the long-acting heat-insulation polyimide fiber is obtained. A horizontal layered structure with a bent fiber form is formed by adopting a centrifugal spinning technology, the heat transfer efficiency is reduced by prolonging a heat conduction path, the bent structure not only enhances the heat insulation performance, but also can improve the mechanical stability through interlacing of fibers, the problem that traditional straight fibers are prone to brittle failure is solved, and the service life is prolonged. And through a bending structure and layered stacking, cooperative improvement of thermal resistance and mechanical properties is realized.

This invention discloses a magnetic amorphous carbon composite aerogel fiber, its preparation method, and its applications, belonging to the field of electromagnetic functional materials. The aerogel fiber has a continuous fiber morphology, composed of an amorphous carbon three-dimensional network framework and uniformly embedded MOF-derived magnetic nanoparticles. The core of its preparation method involves blending transition metal MOF nanoparticles with aramid nanofiber dossile, wet spinning through a unique "MOF-induced-protonation" synergistic gelation mechanism, followed by high-temperature carbonization, which transforms the MOF into magnetic particles in situ and anchors them within the carbon framework. This method is highly versatile and applicable to various MOFs such as Fe, Co, Ni, and Mn, and is simple and can be continuously produced. The resulting aerogel fiber possesses ultra-low density, high flexibility, and excellent broadband strong absorption performance (effective absorption bandwidth ≥ 7.0 GHz, reflection loss ≤ -50 dB), showing broad application prospects in wearable electronics, aerospace stealth, and 5G communication electromagnetic protection.

The invention relates to a preparation method of a multi-cross-linked hydrophilic copper (II) ion imprinted polymer, which belongs to the field of functional high polymer materials and comprises the following two steps: firstly, carrying out free radical copolymerization on an allyl tertiary amine salt modified salicylaldoxime copper (II) complex, a first tonality monomer, a first cross-linking agent and a water-based initiator in water, neutralizing after reaction, filtering and drying to obtain a second tonality monomer; a cross-linked polymer containing copper ions and tertiary amine groups is obtained; the preparation method comprises the following steps: firstly preparing a quaternary ammonium cation hydrophilic cross-linked polymer, then dissolving the quaternary ammonium cation hydrophilic cross-linked polymer in an organic solvent, reacting with an unsaturated alkylation reagent to generate a polymerizable quaternary ammonium cation hydrophilic cross-linked polymer, then adding a second tonality monomer, a second cross-linking agent and an initiator for secondary copolymerization, and finally preparing an imprinted polymer in a hollow resin ball, porous membrane or fiber form through a precipitation, membrane forming or spinning process. The solid-phase anion and cation dual-extraction agent for copper (II) ion imprinting and counter ions thereof is suitable for high-selectivity enrichment and deep extraction separation of copper (II) ions in various water systems, and has the function and characteristic of simultaneously extracting counter anions.

The present application provides a high-efficiency antibacterial and mildew-proof polypropylene masterbatch and a preparation method thereof. The masterbatch comprises a PP resin, an antibacterial and mildew-proof agent, and other additives. The antibacterial and mildew-proof agent is a C / ZnO composite prepared by an electrospinning method. The C / ZnO composite prepared by the electrospinning method retains the fiber form of the spinning product after carbonization. These fibrous substances can be inserted into the polypropylene molecular chain, thereby strengthening the bonding strength with the polymer and improving the dispersion of the material. The particle size range can still be maintained in the nanometer range during the dispersion process. A small amount of the masterbatch can make the PP resin have excellent antibacterial and mildew-proof effects. The masterbatch has the advantages of low improvement cost and easy promotion and implementation.

The invention discloses an intelligent effect evaluation method for a curcumin composite fiber wound dressing, and belongs to the technical field of medical evaluation, and the method specifically comprises the following steps: constructing a multi-parameter coupled dynamic wound simulation environment; placing the dressing sample in an environment to run for a complete period, and synchronously collecting data of fiber morphology, environment pH value, curcumin concentration and viable count; dividing continuous characteristic stages according to environment and flora data changes; extracting geometrical characteristic parameters of the fiber morphology at each stage, and performing time domain alignment and correlation analysis on the geometrical characteristic parameters and corresponding curcumin concentration data to obtain structure-release correlation parameters; on the basis of the parameters and environmental pH value data, calculating a drug release-antibacterial synergistic coefficient of each stage through a staged model; and finally, generating a dynamic evaluation map according to the change relation of the collaborative coefficient between the continuous characteristic stages. According to the invention, accurate quantification and staged evaluation of dressing intelligent response behaviors under the condition of simulating a real wound dynamic complex environment are realized.

The invention discloses a modified cellulose acetate membrane and a preparation method thereof.The preparation method comprises the specific steps that cellulose acetate is dissolved in a solvent formed by mixing N, N-dimethylacetamide and acetone, then 2-methylimidazole is added to form a uniform and stable spinning precursor solution, and finally the modified cellulose acetate membrane is prepared through an electrostatic spinning method. The fiber membrane prepared by the invention is smooth in fiber surface, relatively uniform in diameter distribution, and good in fiber morphology and porosity. And the preparation process is simple, convenient and feasible, the cost is controllable, the competitiveness in large-scale production and practical application is high, and popularization is facilitated.

The invention discloses a preparation method of a bio-based high-performance honeycomb core material, and relates to the field of composite material preparation. The invention aims to solve the technical problem that a high-performance straw-plastic honeycomb plate cannot be efficiently prepared in a long fiber form in the prior art. The method comprises the steps of straw-plastic composite board preparation, softening, mold pressing, corrugated board softening, assembling and cooling. Biomass does not need to be smashed, and energy consumption of processing and generated dust pollution are reduced; the composite board with high mechanical strength in a specific direction is prepared by utilizing anisotropy of long fibers; the processing technology is simplified, the honeycomb core material is prepared by directly using mature molding technologies such as mold pressing and the like by utilizing the reprocessability of the thermoplastic plastic matrix, and the method has industrialization potential. The method is used for preparing the bio-based high-performance honeycomb core material.

The invention discloses solution type nanofiber spinning equipment, and relates to the technical field of nanofiber spinning, the solution type nanofiber spinning equipment is characterized in that a first through hole which is horizontally through and a second through hole which is obliquely through are formed in the side wall of a box body, and the second through hole is flush with the first through hole; the air supply assembly is provided with an output end and communicates with the second through hole to guide airflow in. The spinning module comprises a spinning die head and a high-voltage electrostatic ring, the high-voltage electrostatic ring is located below the spinning die head to form a high-voltage electrostatic field, a spinneret orifice is formed in the spinning die head and is a double-layer skin core hole, a spinning solution is guided into the inner layer of the spinneret orifice, and pressurized airflow is guided into the outer layer of the spinneret orifice; the spinning solution flows out through the spinning die head and is drafted under the action of the pressurized airflow, meanwhile, spiral disordered air is formed in the box body, and the spiral disordered air is overlapped with the pressurized airflow and the action of the high-voltage electrostatic field to regulate and control the fiber form. The method has the advantage that various fibers with special-shaped structures can be prepared in a macro-scale manner by regulating and controlling the morphology of the nanofibers.

The application provides a multilayer aramid fiber high-temperature-resistant material and a preparation method and application thereof, and belongs to the technical field of multilayer fiber materials. The multilayer aramid fiber high-temperature-resistant material comprises a dust-encountering layer, an anti-static layer and a high-strength filtering layer, wherein the dust-encountering layer is a non-woven fabric made of meta-aramid and polyolefin elastic fiber, and the fiber is entangled through water jet strengthening to form a covalent cross-linking crystal network structure; the anti-static layer is a woven fabric made of meta-aramid, para-aramid and conductive fiber in a plain weave structure or a basket weave structure, and the woven fabric is formed after low-pressure water needle water jetting, and has the characteristics of anti-static, stable structure and high-temperature resistance; and the high-strength filtering layer is a woven fabric made of polyimide filaments in a 2 over 2 under right twill weave structure or a honeycomb weave structure. The application relies on special fiber morphology and fabric organization to prepare a high-temperature-resistant material with high filtering efficiency and high strength.