744 results about "Polymer composites" patented technology

The invention relates to the technical field of solid waste treatment and recycling, and discloses a waste incineration fly ash geopolymer composite material and a preparation method thereof, and the composite material is prepared from waste incineration fly ash, apatite minerals, zero-valent iron powder, persulfate and an alkali activator. The preparation method comprises the following steps: mixing the waste incineration fly ash, apatite minerals, zero-valent iron powder and persulfate to obtain composite powder; performing frequency conversion mechanochemical synergistic activation on the composite powder, wherein the activation process comprises a low-temperature activation stage and a high-energy pulse activation stage; and finally, mixing the activated powder with an alkali activator, pouring, molding and curing. According to the method, the reduction reaction and the oxidation reaction are driven step by step in the same system by regulating and controlling the mechanical energy input time sequence, the compatibility problem of a reducing agent and an oxidizing agent is solved, different types of persistent organic pollutants are synergistically degraded, meanwhile, heavy metal is stabilized, and the treatment effect is good. And the fly ash is recycled to prepare a geopolymer material with mechanical properties.

The invention belongs to the technical field of composite material design, and discloses a polymer composite material design method based on LLM knowledge database construction and reasoning optimization, and the method comprises the following steps: S1, target performance setting; s2, constructing a knowledge database; s3, constructing a reverse design model; s4, constructing a performance verification module; and S5, performing multi-round test-verification design loop optimization. According to the method, an intelligent design method integrating target setting, semantic knowledge database construction, a design assistant, a performance verifier, a prompt engineering module and a language model material knowledge system is provided, closed-loop reasoning and feedback of structure-mechanism-performance are achieved through multiple rounds of DA-VM collaborative optimization, and the design efficiency is improved. The method has the advantages of high design efficiency, strong structure generation rationality, accurate performance prediction, knowledge evolvable and the like, and is suitable for intelligent rapid development of the high thermal conductivity-wave absorbing-shielding-mechanical integrated functional polymer composite material.

The invention discloses a wide-temperature energy storage aerogel / polymer composite material and a preparation method thereof.The preparation method comprises the steps that oxide aerogel with a three-dimensional skeleton structure is subjected to silanization treatment to obtain hydrophobic oxide aerogel, then the hydrophobic oxide aerogel is dispersed into a solvent to obtain dispersion liquid, and then the dispersion liquid is subjected to ultrasonic treatment to obtain the wide-temperature energy storage aerogel / polymer composite material. The preparation method comprises the following steps: sequentially adding a diamine monomer and an anhydride monomer into a dispersion liquid, reacting under stirring to obtain a polyamide acid precursor solution dispersed with hydrophobic oxide aerogel, carrying out film casting on the polyamide acid precursor solution to obtain a dry film, and carrying out imidization treatment on the dry film to obtain the aerogel / polymer composite material. The obtained aerogel / polymer composite material can still maintain high energy storage performance and stability even at extreme ambient temperature.

The invention belongs to the technical field of polymer composite materials, and discloses a carbon fiber interface modifier aided design method and system based on collaborative optimization, and the method is used for designing a carbon fiber interface modifier based on collaborative optimization of machine learning and molecular dynamics simulation. By constructing a closed loop iteration process of generation-prediction-verification-learning, interfacial modifier molecules meeting multi-target performance requirements are quickly and accurately obtained under the condition that a large amount of early-stage chemical synthesis and experimental screening are not needed. According to the method, through deep combination of high-throughput prediction of machine learning and virtual experiment verification of molecular dynamics, efficient and automatic design of the interface modifier molecules is achieved, experimental synthesis and trial and error links are greatly reduced, the research and development efficiency is improved, and the method is widely suitable for design and optimization of the interface modifier molecules of the carbon fiber / resin-based composite material.

The invention relates to a composite diaphragm with a functional gradient coating and a preparation method of the composite diaphragm. The composite diaphragm comprises a porous base membrane, a solid electrolyte coating attached to one side or two sides of the porous base membrane, a mixed functional coating attached to the surface of the solid electrolyte coating, and a polymer composite coating on the outermost layer, the solid electrolyte coating comprises a first solid electrolyte and a first binder; the mixed functional coating comprises a second solid electrolyte, a high dielectric constant nano material and a second binder; the polymer composite coating comprises an in-situ polymerized polymer of a three-dimensional network structure, and a lithium salt and a third solid electrolyte which are filled in gaps of the three-dimensional network structure; the polymer is formed by initiating in-situ polymerization of polymerizable monomers through a photoinitiator. When the composite diaphragm is applied to the lithium battery, the cycle performance of the lithium battery can be improved.

The invention discloses a preparation method of a solid-state polymer composite electrolyte material and application of the solid-state polymer composite electrolyte material in an all-solid-state battery, and relates to the technical field of all-solid-state lithium ion batteries, and the preparation method comprises the following steps: firstly synthesizing a skeleton filler, adding an acid solution, and then carrying out ultrasonic treatment, soaking, centrifuging and washing to obtain an acid-modified skeleton filler; dispersing the acid-modified skeleton filler in an organic solution, adding a lithium salt, stirring, centrifuging, and washing to obtain a lithiated skeleton filler; weighing an electrolyte salt, adding the electrolyte salt into the polymer precursor, adding the lithiated skeleton filler, uniformly mixing, and drying to obtain a dried product; and finally, rolling the dried product into a thin film to obtain the solid polymer composite electrolyte thin film. According to the preparation method of the solid polymer composite electrolyte material, the ionic conductivity and Li < + > transference number of a solid polymer composite electrolyte thin film prepared by inducing polymer precursor polymerization through cations and compounding the inorganic filler at normal temperature are superior to those of a commercial PP film and a poly N, N-dimethylacrylamide film.

The application discloses a kind of nanocellulose modified acrylic water-based emulsion and its preparation method and application, it is related to the technical field of polymer composite.A kind of modified acrylic water-based emulsion includes 180-220 parts of acrylate monomer, 45-60 parts of functional monomer, 3-5 parts of nanocellulose liquid, 4-6 parts of emulsifier, 1.5-2 parts of initiator, 2-3 parts of sodium bicarbonate and 275-300 parts of deionized water, wherein functional monomer includes hydroxy acrylate, acrylonitrile and fluorine-containing acrylate.By using fluorine-containing acrylate with nanocellulose to modify acrylic emulsion, water-based emulsion with good film-forming performance can be prepared, and the formed coating has good adhesion, stain resistance, heat oil resistance and mechanical strength, if the water-based emulsion is applied to the surface modification of filter material, not only can improve the hand feeling of filter material, but also can improve the stain resistance and service life of filter material surface.

The invention belongs to the technical field of high-molecular polymers and functional coatings, and particularly relates to a water-based high-molecular composite sound-absorbing and sound-insulating coating and a preparation method thereof. The composite sound-absorbing and sound-insulating coating comprises the following components in parts by weight: 20-40 parts of silicone acrylic emulsion; 15-30 parts of a porous sound-absorbing filler; 20-40 parts of a high-density sound insulation filler; 5 to 10 parts of cross-linked acrylate coated butyl rubber core-shell emulsion; 1-8 parts of a functional auxiliary agent; and 10 to 25 parts of deionized water. Through cooperative use of the porous sound-absorbing filler, the high-density sound-insulating filler and the butyl rubber elastic damping material, the sound-absorbing coefficient and the sound-insulating amount of the coating can be synergistically improved. Core-shell coating treatment is carried out on butyl rubber through cross-linked acrylate, the adhesive force, flexibility and alkali resistance of the coating can be remarkably improved, and meanwhile the acoustic performance of the coating is also improved.

The invention discloses a high-performance Mg < 2 + > / Li < + > separation nanofiltration membrane and a preparation method thereof, the Mg < 2 + > / Li < + > separation nanofiltration membrane is a polymer composite membrane, and is composed of a surface separation layer and a support layer; the surface separation layer is formed by self-assembling a polycation electrolyte and a polyanion electrolyte layer by layer, the supporting layer is formed by ultraviolet grafting of any one or two of sodium polystyrene sulfonate, polymethylacrylic acid 3-sulfonic acid propyl ester potassium salt and polyacrylic acid on the surface of a hydrophobic polymeric membrane, and the surface of the supporting layer is negatively charged. The negative charge amount of the supporting layer is gradually reduced from top to bottom; the whole separation membrane has the characteristics that the upper layer is hydrophilic and the lower layer is hydrophobic. By adjusting the charge density and aperture of the supporting layer, the structure of the surface separation layer is influenced, the charge repulsion effect, aperture screening effect and built-in electric field intensity of the whole membrane are enhanced, and the Mg < 2 + > / Li < + > separation factor is increased. Permeation and rapid transportation of water are promoted by virtue of a hydrophilic upper-layer and hydrophobic lower-layer structure, and the membrane flux is improved; the preparation process is simple, and the used solvent is water, so that the method is green and environment-friendly and has a good application prospect.

The invention discloses a preparation method and application of a vertically-oriented ferroelectric ceramic-polymer composite solid electrolyte, and belongs to the field of application of solid-state lithium metal batteries. The electrolyte membrane is composed of polyvinylidene fluoride, ferroelectric ceramic powder, lithium salt and the like. The ferroelectric ceramic can form dipoles under the action of an electric field, polyvinylidene fluoride conformation is induced to be converted from an alpha phase to a beta phase, the beta conformation has large dipole moment, dissociation of lithium salt can be promoted, and more free lithium ions are generated. Through multi-solvent blending, the freezing orientation technology can be adjusted, the ferroelectric ceramic-polymer composite solid electrolyte membrane of a vertical ordered structure is prepared, and the shortest path of transmission of lithium ions between a positive electrode and a negative electrode is achieved. The vertically oriented ferroelectric ceramic-polymer composite solid electrolyte can promote lithium salt dissociation, reduce the transportation tortuosity of lithium ions and increase the ionic conductivity. The battery assembled by the material can effectively inhibit the growth of lithium dendrites, and has excellent rate capability and cycling stability.

The invention relates to the technical field of photo-thermal gas treatment, in particular to a pH response type conjugated polymer nano-composite particle as well as a preparation method and application thereof, and develops a conjugated polymer nano-composite particle IN-20-(NH4) 2S capable of intelligently responding to acidic pH in a tumor microenvironment, which is used for photo-thermal and gas synergistic treatment of tumors. The nanoparticles generate heat under NIR-II light induction to promote the conjugated polymer composite material to release (NH4) 2S, the (NH4) 2S responds to acidic pH and can react with acid to generate H2S, the concentration of the (NH4) 2S is gradually increased along with time, the release amount of the (NH4) 2S is more remarkable under the illumination condition, and a new strategy is provided for enhancing the accuracy and effectiveness of tumor treatment.

The invention belongs to the technical field of polymer composite materials, and discloses a large-scale preparation method of a PPS-based composite material with low expansion and high dimensional stability. According to the method, a multi-scale synergistic enhancement system of graphene and nano silicon dioxide is constructed, a maleic anhydride grafted PPS compatilizer is introduced into melt blending, and interface chemical anchoring is achieved through amino-maleic anhydride-epoxy ternary reaction. The filler is premixed according to the mass ratio of 1: 1 after being subjected to surface functionalization, the total content is 15-30 wt%, and the composite material is obtained through twin-screw reactive extrusion and injection molding. The invention provides the large-scale preparation method of the low-expansion high-dimensional-stability PPS-based composite material which is reasonable in structural design, high in process controllability, excellent in performance index and suitable for industrial production, and the problem that thermal expansion suppression and interface strengthening are difficult to consider at the same time in the prior art is solved.

The invention belongs to the technical field of biomass composite material processing, and discloses a plant fiber-polymer composite material and a preparation method thereof. The plant fiber-polymer composite material is prepared from the following raw materials in parts by mass through plasticizing extrusion molding: 50 to 88 parts of plant fibers, 0.5 to 8 parts of a biomass cross-linking agent, 0.5 to 5 parts of a low-temperature water-soluble polymer, 10 to 50 parts of water and 0.05 to 3 parts of metal ions, wherein the metal ions and the biomass cross-linking agent form a reversible cross-linked network in the system through coordination; due to the existence of the reversible cross-linked network, the composite material can be plasticized and continuously extruded and molded under the shearing action at the temperature of 20-70 DEG C. The metal ion-biomass cross-linking agent coordination network provides high structural strength in a static state and is reversibly dissociated in a shear field, so that shear-driven plasticizing of a high-viscosity and high-fiber-content system in a low-temperature interval of 20-70 DEG C is realized.

The invention discloses an AI-driven polymer composite material process optimization method, and aims to solve the problems of data islands, process optimization lag and insufficient model timeliness in a polymer material production process. The method comprises the following steps: collecting full-link data according to a six-level customer product coding specification; the state parameters of the high-frequency equipment are safely stored in the sub-table 1 through encryption and identity authentication; constructing a structured database based on the production batch number association main table, the raw material sub-table set, the sub-table 2 and the sub-table 3; training a multi-model artificial intelligence system fusing gradient boosting regression, Bayesian optimization, a neural network and a random forest, and realizing a bidirectional linkage closed loop of formula recommendation, process optimization and performance prediction; and incremental learning is carried out by adopting a sliding window mechanism in combination with an online gradient descent and elastic weight consolidation strategy. According to the technical scheme, intelligent, efficient and safe optimization of the high polymer material process can be achieved, and the product quality and the production efficiency are remarkably improved.

The invention provides a special fiber material and a preparation method thereof, and belongs to the technical field of polymer composites.The preparation method comprises the following steps that cellulose and an ethanol solution are mixed, polyvinyl alcohol and a 3-glycidoxypropyltrimethoxysilane solution are added, the pH is adjusted to be acidic, heating, suction filtration and drying are conducted, and modified cellulose is obtained; mixing expanded graphite, deionized water, ammonium persulfate and dilute sulphuric acid, heating, cooling, dropwise adding amino polyethylene glycol silane, heating, washing and drying to obtain modified expanded graphite; the preparation method comprises the following steps: mixing modified cellulose, modified expanded graphite, phosphate montmorillonite, 3-(methacryloyloxy) propyltrimethoxysilane, bisphenol A diglycidyl ether and 2-methylimidazole, stirring, heating, defoaming, and carrying out two-stage constant-temperature treatment to obtain the special fiber material. The special fiber material disclosed by the invention has good flame retardance, mechanical strength, water resistance and filtering performance, and can be applied to various organic composite boards, filter membranes and the like with high quality requirements.

The invention relates to the technical field of polymer composite materials, in particular to a cable polymer composite material for a wind turbine blade, which is prepared from the following raw materials in parts by weight: a polymer base material; a reinforcing material; a polymer modified material; a functional additive; a performance modifier; the functional additive is prepared from an anti-ultraviolet agent, an antioxidant, a silane coupling agent and nano titanium dioxide. According to the invention, the epoxy modified polyether-ether-ketone and bisphenol A epoxy resin compounded base material is matched with a continuous glass fiber, carbon fiber chopped strand and nano silicon nitride multi-element reinforcing system, so that the core short board of insufficient mechanical properties of the traditional material is thoroughly solved, and a magnesium hydroxide, aluminum hydroxide, expanded graphite and nano montmorillonite compounded flame-retardant system is also selected, so that the flame-retardant performance of the material is greatly improved. The flame-retardant cable material is high in flame retardance, free of toxic gas release, capable of meeting the environment-friendly requirement, capable of improving the material interface bonding force and long-term service reliability and capable of meeting the requirement for the service life of 20 years or above of wind power blade cables.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a preparation method of an aramid fiber / epoxy resin electronic-grade molding compound. The preparation method comprises the following steps: carrying out plasma treatment on aramid fibers, immersing the aramid fibers into a mixed solution of dopamine hydrochloride and a trihydroxymethyl aminomethane hydrochloride buffer solution for oscillation treatment, and then immersing the aramid fibers into an ethanol solution of a silane coupling agent to obtain modified aramid fibers; adding the modified aramid fiber and epoxy resin into a three-roller grinder for grinding and mixing to obtain pre-dispersed aramid fiber; uniformly stirring and mixing aluminum nitride, zinc oxide, epoxy resin and a silane coupling agent to obtain an epoxy resin prepolymer; stirring the pre-dispersed aramid fiber, an epoxy resin prepolymer, a curing agent, an anti-hydrolysis agent and a toughening agent, performing vacuum defoaming, and performing extrusion granulation to obtain the aramid fiber / epoxy resin electronic-grade molding compound. The composite material prepared by the method has the advantages of low moisture absorption, high thermal conductivity and favorable mechanical strength.

The invention belongs to the technical field of polymer composite materials, and discloses a super-strong heat-shielding fabric with a micro-nano composite structure, and a preparation method and application of the super-strong heat-shielding fabric. The core of the heat-shielding fabric is to construct a multifunctional integrated coating system through the synergistic effect of a slurry formula with specific components and an optimized coating and curing process, and particularly relates to a super-strong heat-shielding fabric used for tents, parasol, outdoor awnings and other products. The invention relates to a fabric, in particular to a fabric with excellent shading, heat shielding, anti-aging and high bonding fastness properties by constructing a micro-nano composite coating structure containing a specific functional filler on a base cloth. On the premise of ensuring excellent bonding fastness and long-term weather resistance between the coating and the flexible base cloth, efficient blocking of the full spectrum (especially near-infrared band) of the sun is realized, so that the super-strong heat-shielding fabric with high heat shielding rate, high physical durability and good processability is provided.

A method and a device for generating recipes of a polymer composite material are provided which include acquiring a prediction recipe based on a preset target property of a target polymer composite material and a recipe prediction model; acquiring a result property of a polymer composite material generated based on the prediction recipe; calculating a difference value between the target property and the result property; and outputting or modifying the prediction recipe based on a result of comparing the difference value with a preset reference value.

The invention relates to an ultra-high molecular weight polyethylene / carbon nanotube electromagnetic shielding material injection molding method, and relates to the technical field of conductive polymer composites.The method comprises the following steps that S1, sufficient UHMWPE, linear polyethylene wax and CNT are taken to be dried, and dried UHMWPE, dried linear polyethylene wax and dried CNT are obtained; s2, mechanically blending the dried UHMWPE, the dried linear polyethylene wax and the dried CNT to obtain composite particles; and S3, carrying out injection molding on the composite particles to obtain the ultrahigh molecular weight polyethylene / carbon nanotube electromagnetic shielding material. The ultra-high molecular weight polyethylene / carbon nanotube electromagnetic shielding material is prepared in an injection molding mode, the production period is greatly shortened, the production efficiency is greatly improved, and the method is suitable for industrial production; and a workpiece with a complex geometric structure can be prepared through injection molding, and the application range of the UHMWPE / CNT electromagnetic shielding material can be greatly expanded.

The invention discloses an interface thickness parameter acquisition method based on a microcosmic full-atom composite model, and belongs to the field of molecular simulation. The method comprises the following steps of: firstly, constructing a periodic model of a polymer A and a periodic model of a polymer B by utilizing MS software, and after the periodic models are combined, obtaining a global energy minimization total-atom composite model through geometric optimization and dynamic equilibrium optimization; finally, atomic concentration distribution data points of the full-atomic composite model are calculated in an MS software Perl script module through the secondary programming technology, an atomic concentration distribution curve is drawn, and smooth processing is conducted; setting a judgment benchmark of the interface thickness of the full-atom composite model, and judging whether the interface thickness exists in the full-atom composite model or not; and defining an interface thickness calculation formula of the full-atom composite model, and calculating the interface thickness of the full-atom composite model with the interface thickness, so as to quickly, efficiently, accurately and quantitatively calculate the thickness result of the interface layer of the polymer composite material. In addition, the method has the advantages of being convenient to operate and the like.

The invention relates to the technical field of composite solid electrolytes, in particular to a metal organic framework-polymer composite solid electrolyte and a preparation method and application thereof.The preparation method comprises the following steps that a modified complexing system is added into an anhydrous solvent to form a complexing solution, modified UiO-66 is added into the complexing solution to form precursor slurry, and the precursor slurry is prepared; the preparation method comprises the following steps: taking a metal organic framework as a raw material, carrying out polymerization in a nitrogen atmosphere to form a gel electrolyte membrane, shaping the polymerized gel electrolyte membrane to obtain a composite solid electrolyte membrane, and soaking the composite solid electrolyte membrane in a lithium salt ethanol solution to obtain the metal organic framework-polymer composite solid electrolyte membrane. According to the invention, adsorption and transmission of Li < + > by UiO-66 are optimized through a hydrophilic / lithium-loving group of the modified coupling agent, the dissociation degree of lithium salt and the migration rate of Li < + > can be improved by a modified complexing system, and uniform distribution of Li < + > in the electrolyte is realized in cooperation with the lithium conduction effect of the modified UiO-66, the local current density is reduced, and dendritic crystal growth is inhibited in dynamics.

The invention belongs to the technical field of civil engineering materials, and particularly relates to sprayed concrete suitable for a chlorine salt erosion environment and a preparation method of the sprayed concrete. And meanwhile, the bionic helical carbon nanotube-polymer composite gel is pre-dispersed in water. Sequentially adding the aggregate, the fiber and the composite cementing material, carrying out dry mixing, adding the gel dispersion liquid, the water reducing agent and the air entraining agent, and stirring to obtain a mixture; and finally, adding an alkali-free liquid accelerator at a nozzle through a wet spraying process, and spraying the alkali-free liquid accelerator to a construction surface. The nano hybrid material can effectively adsorb and lock chloride ions, and the bionic gel has a crack self-repairing function. And the two components have a synergistic effect, and are combined with a compact microstructure and a fiber reinforcing and toughening effect, so that the obtained concrete has extremely high chloride ion penetration resistance and durability, and is particularly suitable for support and protection engineering in chlorine salt environments such as temporary expressways and the like.

The invention belongs to the technical field of modified preparation of porous oil-containing materials, and provides a hierarchical porous oil-containing composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a polymer and a corresponding polymer covalent organic framework material, and sequentially carrying out cold pressing and hot sintering to obtain the hierarchical porous polymer composite material. And placing the hierarchical porous composite material in lubricating oil, and carrying out vacuum impregnation to obtain the hierarchical porous oil-containing composite material. The hierarchical porous oil-containing composite material prepared by the preparation method provided by the invention realizes self-adaptive oil supply within a wide rotating speed range and under different centrifugal forces, can meet the characteristics of maintenance-free property, high precision, high reliability, maintenance-free property and environmental friendliness of the material, and meets the upgrading of high-end equipment towards long service life and intelligence; and meanwhile, the balance of enhanced adsorption and high oil content (20%)-high oil retention rate (gt; 90%) of the lubricating oil is realized.

The application belongs to the technical field of polymer composites, and discloses a low linear expansion coefficient polyphenylene sulfide composite material, a preparation method and application thereof. The composite material comprises 20-60 parts of polyphenylene sulfide resin, 40-80 parts of a low expansion filler system, 0.5-5 parts of a coupling agent, 0.1-1 part of a lubricant and 0.1-1 part of a toning agent. The low expansion filler system is at least two of a lamellar structure filler, a fibrous structure filler and a nano-sized filler. The polyphenylene sulfide composite material obtained has a low linear expansion coefficient while maintaining good mechanical properties through the limiting effect of the lamellar structure filler on the thermal expansion of the resin matrix, the reinforcing effect of the fibrous structure filler on the strength and modulus of the material and the improvement effect of the nano-sized filler on the filling structure and the interface state. The polyphenylene sulfide composite material can be applied to the fields of precision instruments, electronic packaging, electronics and electrical appliances, automobiles and aerospace, etc. which have high requirements for thermal dimensional stability.

The polyester based polymer composition includes a polyester, a metal oxide, and a metal hydroxide. The polymer composites contains the metal oxide and a metal hydroxide made from melting blending has good mechanical property as well as greater degradability after a required time in the higher temperatures and moisture of downhole conditions. The reinforced polymer composites with glass fibers, and the metal oxide and metal hydroxide made from melting blending has higher mechanical property as well as greater degradability after a required time in the higher temperatures and moisture of downhole conditions. The polymer composites made from melting blending have the required mechanical properties and the degradability so that the polymer composites can be used for degradable or dissolvable component of a downhole tool.

The invention belongs to the technical field of polymer composite materials, and discloses a leather collagen fiber / polyurethane composite material and a preparation method thereof. The metal-polyphenol coordination network interface layer provided by the invention is accurately positioned on the surface of the leather collagen fiber and is between the fiber and a waterborne polyurethane matrix, and a three-stage structure of'fiber-interface layer-matrix 'is constructed. The interface layer forms a stable network through coordination of metal nanoparticles and polyphenol, and forms chemical bridging with a WPU matrix through secondary bonding. According to the structure, the tearing strength and the tensile capacity of the composite material are greatly improved, the limitation that reinforcement and toughening are difficult to consider in traditional physical blending modification is broken through, and a synergistic reinforcement effect is generated.

The application belongs to the field of polymer composites, and particularly relates to a synergistic flame-retardant composite material for fireproof doors and a preparation method thereof; aiming at the problem that excessive addition of a flame retardant can cause the mechanical property of a composite material to decrease; the application improves the dispersibility of nano-zinc oxide in a PVC matrix through citric acid / phytic acid composite modification, and forms a high-efficiency synergistic flame-retardant system by compounding with aluminum diethyl phosphinate and melamine cyanurate; by constructing a gradient functional structure of a high-flame-retardant region and a low-flame-retardant region, and cooperating with a co-extrusion process, the damage of the flame retardant to the mechanical property of the matrix is reduced while the overall excellent flame-retardant property of the material is ensured.

The present application belongs to the technical field of inorganic fixed luminescent materials and medical polymer elastic stents, and relates to an elastic stent composed of near-infrared inorganic stress luminescent material and organic polymer and a preparation method. The composite elastic stent provided by the present application is manufactured by using 3D printing technology, adopts biodegradable polymer material as a printing base material, and adopts inorganic near-infrared stress luminescent material as a reinforcing phase material and a luminescent base, so that the hollow, cylindrical and net-shaped polymer composite elastic stent required is printed on a cylindrical surface base, and the composite elastic stent can be applied to real-time monitoring of the internal microenvironment of a blood vessel after an operation.

The present disclosure relates to a separator for an electrochemical device and a method of manufacturing the same. Specifically, the separator according to one aspect of the present invention is prepared using electrospinning so as to have improved pore characteristics, and thus, when a separator prepared using electrospinning is used in an electrochemical device, electrochemical performance is improved. The separator for an electrochemical device according to the present invention comprises: a polymer composite membrane comprising polymer nanofibers and inorganic particles held together by the polymer nanofibers, wherein the polymer composite film includes a three-dimensional network structure formed of polymer nanofibers and a pore structure formed of gaps between the polymer nanofibers, the inorganic particles have a fracture toughness of 0.8 MPa.m1 / 2 or more, and the thickness of the polymer composite film is 15 [mu] m or less.