1113 results about "Poly ether ether ketone" patented technology

The invention belongs to the technical field of solid floating body material preparation, and particularly relates to a method for preparing a high-performance hollow glass bead / epoxy resin floating body material. Uniformly mixing the hollow glass beads subjected to surface treatment with polyether-ether-ketone, vibrating and compacting in a mold, heating to 370-380 DEG C, preserving heat for 15-20 minutes, and cooling to room temperature, so as to obtain a porous preform; and pouring mixed liquid of liquid epoxy resin and a curing agent into the porous prefabricated body, and curing to obtain the high-performance hollow glass bead / epoxy resin floating body material. The hollow glass beads in the prepared floating body material are complete in structure, high in filling rate and uniform in distribution, the floating body material is free of bubble phases, and the strength is remarkably improved.

The invention relates to the technical field of heavy anti-corrosion coatings, in particular to a graphene enhanced epoxy modified organic silicon resin heavy anti-corrosion powder coating. The coating is prepared from the following components in parts by weight: 42 to 58 parts of epoxidized epoxy modified organic silicon resin, 0.8 to 2.5 parts of hydroxylated graphene, 6 to 11 parts of nano zirconium dioxide coated boron nitride, 2.5 to 5.5 parts of lanthanum iso-octoate-titanate composite coupling agent, 1.5 to 3.5 parts of bis (3-triethoxysilylpropyl) disulfide, 4 to 7 parts of polyhedral oligomeric silsesquioxane, 5 to 8 parts of curing agent, 0.8 to 1.8 parts of flatting agent and 0.4 to 0.9 part of defoaming agent. 2.5 to 4.5 parts of polyether-ether-ketone micro powder and 1.2 to 2.8 parts of fluorine-containing phosphate ester. According to the invention, the resin is modified through chemical bridging, the modified graphene and the nano-coated powder are matched to construct a synergistic enhancement system, and the interface bonding is optimized by the composite coupling agent. The coating is excellent in adhesive force, corrosion resistance and mechanical property, good in processing fluidity and high in aging resistance and thermal stability, solves the problem that a traditional product is short in performance, and meets the industrial requirement.

The invention belongs to the technical field of electrochemical materials, and discloses an epoxy resin solid electrolyte as well as a preparation method and application thereof. The preparation raw materials are as follows: 100 parts of epoxy resin, 5-15 parts of an ionic conductive group compound, 5-15 parts of a high ionic conductive lithium salt, 2-20 parts of an ionic liquid, 10-30 parts of a flexible chain segment compound, 1-20 parts of a pore forming agent and 20-50 parts of a curing agent. The ionic conductive group compound comprises a sulfonic compound, a quaternary ammonium salt or a carboxyl compound; the flexible chain segment compound comprises one or more of polyester, polyurethane, polyacrylate, polyacrylic acid, polyamide and polyether-ether-ketone. According to the invention, the epoxy resin is used as a main matrix, the ionic liquid provides an ionic migration path, meanwhile, an ionic conductive group is grafted into an epoxy resin molecule, a flexible chain segment is introduced to reduce the crosslinking density, and the cured electrolyte matrix can form an effective ion channel, so that the conductivity is improved.

The invention discloses polyether-ether-ketone resin with adjustable molecular weight distribution as well as a synthesis method and application of the polyether-ether-ketone resin. The synthesis method comprises the following steps: preparing polyether-ether-ketone resin in the presence of carbonate and / or bicarbonate of alkali metal; wherein the carbonate and / or bicarbonate of the alkali metal comprises sodium carbonate and potassium carbonate, and the sodium carbonate has gradient particle size distribution. According to the invention, sodium carbonate with specific particle size distribution is used to regulate and control the reaction rate to be stable and continuous, so that the molecular weight distribution of the polymer presents a narrower distribution form. Therefore, the molecular structure is uniform, the molecular form is uniform, the physical and chemical properties, including mechanical strength, thermal stability and chemical stability, of the material can be improved, and particularly, the thermal stability of the material is improved most remarkably.

The invention discloses a high-strength nano composite stiffening filling master batch and a preparation method thereof, and relates to the technical field of high polymer materials, the raw materials comprise a nano filler, a matrix material and a functional additive; the nano filler comprises nano diamond, nano silicon carbide and bio-based nano cellulose, the base material comprises polyimide, polyether-ether-ketone and bio-based polylactic acid, and the functional additive comprises a hindered phenol antioxidant, a nano aluminum hydroxide flame retardant, a nano silicon dioxide reinforcing agent, an ultraviolet light absorber, a carbon nano tube and nano silver particles. Nano-diamond, nano-silicon carbide and bio-based nano-cellulose are adopted as nano-fillers, polyimide, polyether-ether-ketone and bio-based polylactic acid are combined as base materials, and a plurality of functional additives are added, so that the preparation of the high-strength nano-composite stiffening filling master batch is realized; and the problems of poor dispersibility, mechanical property damage, insufficient hardness and poor interface bonding of the traditional filler master batch can be solved.

The invention relates to the technical field of composite materials, in particular to fiber sizing liquid, a polyether-ether-ketone composite material and a preparation method of the polyether-ether-ketone composite material, and the fiber sizing liquid comprises low-molecular-weight polyaryletherketone containing imide side groups, carbon nanotubes and the like; the composite material is obtained by carrying out heat treatment on fibers, re-sizing the fibers by adopting the sizing liquid, and then carrying out melt extrusion on the fibers and polyether-ether-ketone. The sizing liquid provided by the invention can effectively improve the compatibility between fibers and PEEK, so that the mechanical properties of the composite material are obviously improved.

The invention relates to the technical field of additive processing, and particularly discloses an additive for mixing raw materials of a carbon-based ceramic friction material and a preparation method of the additive. The preparation method comprises the following steps: mixing a treated multi-walled carbon nanotube with a sodium borate and ethylenediamine aqueous solution, calcining at high temperature to obtain a boron nitride-loaded multi-walled carbon nanotube, and combining with a cross-linking agent to prepare a functional filler; adding ethylenediamine, 3, 3-diphenylpropylamine and palladium acetate into the prepared N-methyl pyrrolidone and polyether-ether-ketone solution to obtain modified polyether-ether-ketone; and mixing the modified polyether-ether-ketone, a functional filler, an antioxidant, a lubricant and N, N-dimethylformamide to obtain the additive for mixing the raw materials of the carbon-based ceramic friction material. The additive provided by the invention has good compatibility, can significantly improve the processing molding performance and mechanical strength of the friction material, and effectively reduces the wear rate.

The invention relates to multi-scale modeling and mechanical and thermodynamic property simulation of a particle reinforced biological composite material, and belongs to the crossing field of biology, material science and computer simulation. The method specifically comprises the following steps: constructing a polyether-ether-ketone (PEEK) high-molecular polymer and a graphene reinforced composite material model thereof through a cross-linking algorithm under a microscopic scale, and simulating and calculating the mechanical and thermodynamic properties of the model by adopting molecular dynamics; in the microscopic scale, constructing a representative volume element model of the microstructure artificial skeleton, inputting property parameters calculated by molecular dynamics into a microscopic model, and calculating microscopic mechanical and thermodynamic properties of the model by adopting a substance point method; and inputting the property parameters obtained under the microscale into the macroscopic model, and calculating the overall macromechanical and thermodynamic behavior response of the material by adopting a finite element method. According to the method, mechanical and thermodynamic responses of the biological composite material are finally simulated through transmission of property parameters of different scales, and theoretical support is provided for research and formula design of the particle reinforced biological composite material.

The invention provides an asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane and a preparation method and application thereof, the preparation method comprises the following steps: (1) under a heating condition, mixing surface hydroxylated silicon dioxide particles and paraffin, adding a first solvent, stirring, and cooling to obtain paraffin emulsion droplets; (2) mixing the paraffin emulsion droplets obtained in the step (1) with a sulfydryl-containing silane coupling agent, and reacting to obtain a mixture; and mixing the mixture with a hydrogen peroxide solution, and carrying out oxidation reaction to obtain the asymmetrically modified silicon dioxide particles, and (3) mixing the asymmetrically modified silicon dioxide particles and sulfonated polyetheretherketone, and drying to obtain the asymmetrically modified silicon dioxide particle doped sulfonated polyetheretherketone membrane. The asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane provided by the invention is low in swelling property, relatively high in proton conductivity and relatively good in ion selectivity, and the performance of a flow battery can be improved when the membrane is used for the flow battery.

The invention belongs to the technical field of 3D printing materials, and particularly relates to an interlayer reinforced composite material, a preparation method thereof and application of the interlayer reinforced composite material as a 3D printing material. A copolymerization group is introduced into polyaryletherketone, so that polyaryletherketone has a unique molecular structure and can compete with folding of an ether ketone chain segment in the crystallization process, in this way, in-situ copolymerization polyaryletherketone has a lower crystallization rate compared with polyether-ether-ketone or a polyether ketone system, the healing time of adjacent fused filaments of a 3D printing product is prolonged, and the 3D printing quality is improved. Compared with a conventional 3D printing material, the 3D printing material has the advantages that the interlayer strength is effectively improved and the interlayer reinforcing effect is achieved due to the long healing time, the interlayer performance of a 3D printing product obtained by using the 3D printing material is good, the tensile strength is 120-130 MPa, the interlayer tensile strength is 20-30 MPa, and the application range is wider. The interlayer reinforced composite material provided by the invention has the advantages of lower melting point, favorable processability, favorable mechanical properties, favorable high-temperature resistance and excellent comprehensive properties.

The invention discloses an anti-static polyether-ether-ketone composite film as well as a preparation method and application thereof, relates to the technical field of electrostatic protection materials, and solves the problem of poor dispersity of single-form conductive fibers in a polyether-ether-ketone material in the prior art. The In2O3SnO2 (at) CF composite material with the multilayer porous structure and the superfine hollow structure is prepared through a spinning method and a solvothermal method, the specific surface area of the material is increased, and the conductivity is remarkably improved. The anti-static polyether-ether-ketone composite film is prepared by utilizing a method that indium and tin metal ions in the In2O3SnO2 (at) CF composite material can form stable coordinate bonds with amino groups and carboxyl groups in polyether-ether-ketone containing amino groups and carboxyl side groups, so that the interface bonding capacity between the In2O3SnO2 (at) CF composite material and the anti-static polyether-ether-ketone composite film is remarkably enhanced; the stability and the durability of the anti-static polyether-ether-ketone composite film are further improved. The anti-static film can be applied to preparation of anti-static films of integrated circuit chips and sensors in mobile phones or small electronic equipment.

The invention relates to an electromagnetic shielding resistant PPS alloy material containing modified carbon nanotubes, and belongs to the technical field of polymer composite materials. The PPS alloy material comprises 70-85 parts of polyphenylene sulfide, 5-15 parts of polyether-ether-ketone or a liquid crystal polymer, 3-8 parts of carbon nanotubes subjected to acyl chloride-amido double-step modification and 5-12 parts of carbon fibers subjected to oxidation treatment, and the carbon fibers subjected to oxidation treatment are covalently connected with the carbon nanotubes subjected to double-step modification. 0.5 to 1.5 parts of a coupling agent, 0.3 to 0.8 part of an antioxidant and 0.2 to 0.6 part of a lubricant. According to the invention, the carbon nanotubes are subjected to surface grafting group modification, and the carbon fibers are subjected to surface oxidation treatment, so that the technical problems that the carbon nanotubes are easy to agglomerate, the interface between the carbon fibers and the matrix is weak, and the shielding efficiency and the mechanical property are difficult to consider are solved, and the carbon nanotubes and the PPS matrix form a composite reinforced structure; the comprehensive improvement of the material in the aspects of electromagnetic shielding, mechanical property, thermal stability and the like is realized.

The invention belongs to the technical field of cables, and particularly relates to a high-temperature-resistant metallurgical vehicle-mounted flexible cable and a preparation method thereof. According to the high-temperature-resistant cable material, polyimide, polyphenylene sulfide and polybenzimidazole are matched, so that the high-temperature-resistant cable material is endowed with extremely high high temperature resistance, can resist the high temperature of 300 DEG C, and is extremely suitable for cable materials for metallurgy. Then, the flexibility of the material is improved by adding a flexible polyether-ether-ketone / nano silicon dioxide compound, and the surface of nano silicon dioxide is treated, so that the loading rate of polyether-ether-ketone can be increased, the phase separation phenomenon of polyether-ether-ketone in a blend is prevented, and uniform dispersion is promoted. And finally, the prepared high-temperature-resistant metallurgical vehicle-mounted flexible cable material is used as a filler and a sheath of the cable material, so that the cable structure is reduced, the production difficulty of the cable is reduced, the production process is simplified, and the material and process requirements are reduced, thereby achieving the purposes of reducing the cost and improving the production efficiency to a certain extent.

An article, a method of making the same, and a method of using the same are provided. Such an article includes at least one coated layer, which includes a substrate and a coating disposed on the substrate. The coating includes a layered nanomaterial and a solute embedded and distributed in the layered nanomaterial. The solute comprises at least one salt soluble in a solvent. The substrate comprises a polymer, for example, a high-performance polymer such as polyether ether ketone and poly(para-phenylene terephthalamide). The article is used for thermal management applications, for example, as protective garment.

The invention relates to the technical field of Joule heating, in particular to a high-thermal-conductivity composite film and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: blending hydroxyl modified poly (p-phenylene benzobisoxazole) fibers and polyether-ether-ketone fibers to obtain PBO-OH / PEEK fiber cloth; the preparation method comprises the following steps: mixing a soluble polyether-ether-ketone solution, NH2-MWCNTs and GnPs, and carrying out ultrasonic treatment to obtain a spraying solution; and spraying the spraying liquid on the upper surface and the lower surface of the PBO-OH / PEEK fiber cloth in an electrostatic spraying manner, and performing hot pressing to obtain the high-thermal-conductivity composite film. The high-thermal-conductivity composite film prepared by the preparation method has excellent mechanical properties, and also has excellent in-plane thermal conductivity, electrical conductivity and electromagnetic shielding effect.

The invention relates to the technical field of polyether-ether-ketone composite materials, in particular to a conjugated polythiophene-polyether-ether-ketone-based high-antibacterial coating and a preparation method thereof.The preparation method comprises the steps that hydroxyl modified boron nitride with photocatalytic capacity and aminated PEEK are subjected to melt blending to generate chemical bonding, and a BN-OH / PEEK-NH2 composite fine powder material is formed; then carrying out oxidative polymerization on the BN-OH / PEEK-NH2 composite fine powder and a thiophene monomer under the action of an oxidizing agent, carrying out in-situ synthesis to obtain a polythiophene / BN-OH / PEEK-NH2 conjugated composite material, and subsequently spraying the polythiophene / BN-OH / PEEK-NH2 conjugated composite material to the surface of a base material to prepare a composite coating with excellent antibacterial property, high thermal stability and low friction coefficient; the antibacterial rate of the coating on escherichia coli and staphylococcus aureus under illumination reaches 90% or above, and the coating is suitable for the medical antibacterial field.

The invention discloses a polyether-ether-ketone polishing brush wire material and a preparation method thereof, and belongs to the technical field of brush wire material preparation. The polyether-ether-ketone polishing brush wire material is prepared from, by weight, 50-70 parts of polyether-ether-ketone, 8-13 parts of a modified flexibilizer, 5-10 parts of a modified stabilizer, 3-6 parts of a light stabilizer, 6-12 parts of a lubricant and 2-5 parts of graphite, the modified flexibilizer is prepared from allyl glycidyl ether, benzyl dimethyl silane, vinyl acetic acid and 4-methoxyphenol, and the modified flexibilizer is prepared from vinyl acetate and 4-methoxyphenol. The modified stabilizer is prepared from pentafluorobenzoic acid, potassium tert-butoxide, 1, 10-phenanthroline, pentafluorobromobenzene, 4-aminophenol and pyromellitic dianhydride. The polyether-ether-ketone polishing brush wire material prepared by the method has excellent toughness, organic solvent resistance and wear resistance.

The invention discloses a surface coating modified calcium phosphate microsphere and a preparation method thereof, and belongs to the technical field of calcium phosphate microsphere preparation. The surface coating modified calcium phosphate microspheres are prepared from the following components in parts by weight: 60 to 68 parts of calcium phosphate ceramic powder, 20 to 32 parts of modified bioactive bodies, 8 to 12 parts of composite pore forming agents and 2 to 5 parts of binding agents, the modified bioactive body is prepared from vinyltriethoxysilane, butyl dibutyl phosphate, citric acid, calcium acetate, magnesium sulfate and polyether-ether-ketone fibers, and the composite pore-forming agent is prepared from octyl dimethyl tertiary amine, epoxy chloropropane, hydrolyzed soybean protein and starch. The calcium phosphate microspheres prepared by the method have excellent porosity and biological activity.

The invention discloses a room-temperature curing water-based ultrahigh-pressure insulating coating for electronics. The coating is formed by curing a water-based ultrahigh-pressure insulating paint at room temperature, the water-based ultrahigh-pressure insulating paint is prepared from a component A and a component B, wherein the component A comprises waterborne polyurethane resin, a curing agent, polyether-ether-ketone ultrafine powder, an insulating nano material and water; the component B comprises a dispersing agent, a foam inhibitor, a flatting agent, a wetting agent, a coalescing agent and a thickening agent. According to the invention, the added insulating nano material can improve the electrical insulation characteristic of the coating, so that the coating has a high insulating effect, is not easy to break down and has extremely high safety when being applied to electronic equipment, and the insulating nano material forms a network-shaped skeleton structure through mutual crosslinking in the coating, so that the structure of the coating can be supported and stabilized, and the service life of the coating is prolonged. The coating is not easy to damage, so that the stability of the coating is good, and the ultrahigh-voltage insulation effect can be kept for a long time.

The invention relates to the technical field of biomedical materials, in particular to an artificial bone composite material and a preparation method thereof. The preparation method of the artificial bone composite material comprises the following steps: sequentially adding a CaCl2 solution and a NaH2PO4 solution into a collagen solution in proportion. And adjusting the pH value to 7.4, and collecting white jelly. Dispersing the white jelly in distilled water to obtain a colloid I; respectively adding the colloid I and the modified polyether-ether-ketone powder into a dichloromethane solution containing poly-L-lactic acid in proportion to obtain a mixed solution II, and then adding an ethanol solution for precipitation; and removing the precipitate in the mixed solution II to obtain the slurry. Injecting the slurry into a mold to obtain an intermediate I, and soaking the intermediate I in an EDC / NHS ethanol solution for crosslinking; according to the preparation method, the artificial bone composite material with high mechanical strength and good biocompatibility can be prepared, the defect that the biocompatibility and mechanical strength resistance of the artificial bone composite material cannot be obtained at the same time in the prior art can be overcome, and the practicability of the artificial bone composite material is improved.

The invention provides a preparation method of an HNT modified polymer composite membrane. The preparation method comprises the following steps: S1, preparing dealuminated HNT; s2, preparing modified HNT by using the dealuminated HNT; s3, preparing sulfonated polyether ether ketone; s4, performing ionization treatment on the sulfonated polyether ether ketone; and S5, preparing the HNT modified polymer composite membrane by using the modified HNT and the sulfonated polyetheretherketone or perfluorosulfonic acid membrane obtained in the step S4. The problems that an existing flow battery diaphragm is poor in comprehensive performance, high in cost and not suitable for various systems are solved.

The invention relates to the technical field of scale inhibition materials, in particular to a slowly-dissolved micro-nano dispersion scale inhibition material and a preparation method thereof. The composite material comprises a four-layer structure, wherein a porous hydroxyapatite core anchors DTPMP through phosphate radical vacancy to inhibit burst release; sulfonated polyetheretherketone and a cross-linking agent are compounded to form an ion selective controlled release layer, and the diffusion rate of the scale inhibitor is regulated and controlled; photo-thermal conversion graphene quantum dots are embedded in a temperature-sensitive hydrogel shell, and dynamic release is triggered through temperature or Ca < 2 + > concentration; and the corrosion resistance and the mechanical stability are enhanced by the atomic layer deposited ceramic layer and the epoxy resin packaging layer. By constructing a four-layer composite slow-release system, long-acting scale inhibition, extreme tolerance and dynamic response are achieved, the technical problems that a traditional scale inhibition material is high in burst release rate, poor in weather resistance and delayed in release are solved, the water treatment cost per ton is low, the RO membrane service life is long, and a full-period efficient scale inhibition solution is provided for a complex industrial water system.

The invention belongs to the technical field of all-vanadium redox flow battery diaphragms, and particularly discloses a sulfonated polyetheretherketone / polyaniline composite membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing polyetheretherketone and concentrated sulfuric acid, and carrying out water bath heating reaction to prepare a sulfonated polyetheretherketone solid; molybdenum disulfide and methylbenzene are mixed and subjected to ultrasonic treatment, 1, 3-propane sultone is added, oil bath heating is conducted, and sulfonated molybdenum disulfide powder is prepared; the preparation method comprises the following steps: mixing and stirring sulfonated molybdenum disulfide powder, polyaniline and a DMF (Dimethyl Formamide) solution, performing ultrasonic treatment, adding a sulfonated polyether-ether-ketone solid, stirring to obtain membrane casting slurry, coating a glass plate with the membrane casting slurry, drying to form a membrane, and soaking the membrane in a sulfuric acid solution and deionized water in sequence to obtain the sulfonated polyether-ether-ketone / polyaniline composite membrane. The invention discloses a sulfonated polyetheretherketone / polyaniline composite membrane as well as a preparation method and application thereof. The sulfonated polyetheretherketone / polyaniline composite membrane has high proton conductivity, can maintain relatively low vanadium ion permeability and can improve the electrochemical performance of an all-vanadium redox flow battery.

The invention discloses a PC-based building template material with a wide use temperature range and a production method of the PC-based building template material, and belongs to the technical field of building template materials. The PC-based building template material with the wide use temperature range is characterized by being prepared from the following components in parts by weight: 60 to 80 parts of polycarbonate, 10 to 15 parts of modified polyether-ether-ketone, 10 to 20 parts of organic silicon rubber, 3 to 5 parts of a compatible aid, 0.3 to 0.5 part of an antioxidant and 0.2 to 0.5 part of a light stabilizer, the modified polyether-ether-ketone is prepared from maleic anhydride modified polyether-ether-ketone. According to the PC-based building template material, modified polyether-ether-ketone, organic silicon rubber and polycarbonate in a specific proportion are matched to act, so that the compatibility of a matrix is ensured, the high-temperature resistance and low-temperature resistance of the building template material are improved, and the use temperature range of the PC-based building template material is widened; and by adding the compatible auxiliary agent, the overall compatibility is further improved, the phase separation phenomenon is avoided, and the overall consistency and stability of the material are improved.

The invention provides an acidic redox flow battery diaphragm and a preparation method thereof, belongs to the technical field of flow batteries, and aims to solve the technical problems of low energy efficiency and poor cycling stability of flow batteries. The preparation method comprises the following steps: preparing a sulfonated polyetheretherketone solution, and coating one surface of a diaphragm substrate with the sulfonated polyetheretherketone solution; and dispersing and dissolving nano aluminum oxide and an adhesive into a solvent to prepare slurry, and coating the slurry on the other surface of the diaphragm substrate. The positive electrode side is coated with a layer of sulfonated polyetheretherketone, the hydrophilicity and ion exchange rate of the modified membrane are improved by regulating and controlling the sulfonation degree and the thickness of a modified layer, the negative electrode side is coated with Nano-Al2O3, and the purposes of improving the mechanical strength of the positive electrode side of the diaphragm and inhibiting zinc dendrite generation are achieved by regulating and controlling the content of Nano-Al2O3 and the coating thickness.

The invention discloses a photocatalytic polyether-ether-ketone ion exchange membrane as well as a preparation method and application thereof. The invention belongs to the field of polymer chemistry. The problem that the photocatalyst is difficult to recover in the prior art is solved. The preparation method comprises the following steps: preparing a polyether-ether-ketone film with amino and carboxyl side groups by using a film casting method and a chemical grafting method, preparing CoTiO3 nanofibers by using an electrostatic spinning method, preparing Bi-coated CoTiO3 by using a photodeposition method, and grafting Bi-coated CoTiO3 onto the polyether-ether-ketone film containing amino and carboxyl side groups by using a coordination field effect between metal ions and amino and carboxyl to obtain the CoTiO3 / Bi-coated CoTiO3 composite material. And the photocatalytic polyether-ether-ketone film is prepared. The prepared photocatalytic polyether-ether-ketone film has corrosion resistance and stability, can be applied to an extreme environment, can separate a photocatalyst from a reaction medium, realizes reuse, has the advantages of high degradation rate and high reducibility on various antibiotics and heavy metal ions, and can be applied to sewage treatment in various environments.

The invention relates to a filter screen and a preparation method and application thereof, and belongs to the technical field of filtering equipment, the filter screen comprises a hydrophobic enhancement layer, a pre-filtering layer and a core filtering layer which are stacked in sequence; the hydrophobic reinforcing layer comprises the following components: metal fibers; the pre-filtering layer is prepared from the following components: basalt fibers; and the core filter layer comprises the following components: polytetrafluoroethylene fibers and polyether-ether-ketone fibers. By designing the structure of the filter screen, the filter screen which can stably work in a high-temperature environment, has excellent hydrophobic performance and filtering efficiency and is controllable in manufacturing cost is obtained.

The invention provides a triazinyl imidazole porous covalent organic polymer material, preparation thereof and application of the triazinyl imidazole porous covalent organic polymer material in an all-vanadium redox flow battery proton exchange membrane. The triazinyl imidazole covalent organic polymer with high specific surface area, porosity and high structural stability is synthesized, sulfonation modification is performed on the triazinyl imidazole covalent organic polymer, a proton carrier is loaded after sulfonation modification, and the triazinyl imidazole porous covalent organic polymer material with high proton conductivity is obtained. According to the invention, the triazinyl imidazole porous covalent organic polymer material and sulfonated polyetheretherketone are jointly used for preparing the composite membrane, so that the composite membrane shows excellent vanadium resistance and relatively high ion selectivity, and can stably operate in the all-vanadium redox flow battery, so that the comprehensive performance of the all-vanadium redox flow battery is remarkably improved.

An implant part for an orthopedic knee joint prosthesis has a surface region which faces and contacts bone in an implanted state. A least part of the implant part is made from a plastics material, in particular polyether ether ketone or polyether ether ketone composite material. The implant part has a three-dimensional surface structure in the surface region facing the bone. The three-dimensional surface structure includes a rib structure, a first rib portion extending in a plane on a surface of the surface region, or a first rib of the rib structure extending in the plane on the surface of the surface region, and a second rib portion extending in the plane on the surface of the surface region, or a second rib of the rib structure extending in the plane on the surface of the surface region extending in the plane in different directions, at least in portions.

The invention provides a low-dielectric-constant electromagnetic-shielding heat-conducting polyether-ether-ketone composite material and a preparation method thereof, and belongs to the technical field of high polymer material processing, the low-dielectric-constant electromagnetic-shielding heat-conducting polyether-ether-ketone composite material comprises the following raw materials: polyether-ether-ketone resin, low-dielectric-constant glass fibers, a conductive filler, a low-dielectric-constant filler and an auxiliary agent; comprising the following steps: S1, uniformly mixing polyether-ether-ketone resin, a low-dielectric filler, a conductive filler and an auxiliary agent to obtain a mixed material; s2, the mixed material is added into a double-screw extruder from a main feeding port, the low-dielectric glass fiber is added into the double-screw extruder from a side feeding port, the mixed material and the low-dielectric glass fiber are evenly mixed in a screw cavity of the double-screw extruder, and a secondary mixed material is obtained; s3, the secondary mixed material is subjected to heating melting, extrusion granulation and sieving, and the polyether-ether-ketone composite material is obtained. According to the technical scheme provided by the invention, the composite material has the properties of low dielectric constant, strong electromagnetic shielding and high thermal conductivity at the same time.