3883 results about "High polymer" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention relates to the technical field of high polymer material preparation, and discloses a bamboo fiber graft modified full-biodegradable composite membrane material preparation process which comprises the following steps: firstly, performing hot mixing and cooling on dried bamboo fiber powder, anhydrous citric acid, choline chloride, activated zinc oxide and pentaerythritol to prepare a bamboo fiber modified premix; then mixing the biodegradable polyester resin with the premix; adding the mixture into an extruder, injecting epoxidized soybean oil into a barrel through a liquid metering device, and performing melt extrusion granulation under a vacuum exhaust condition; and finally carrying out blow molding to form the film. Through in-situ reaction extrusion of multi-component synergism, surface grafting of bamboo fibers, chain extension of a polyester matrix and interface chemical bonding of the bamboo fibers and the polyester matrix are achieved, interface compatibility is effectively improved, degradation of the material in the processing process is inhibited, and the mechanical property and thermal stability of the composite film material are remarkably improved; the process is efficient and environment-friendly, and the cost is controllable.

The invention provides a preparation method of an h-BN / PI high-temperature-resistant anticorrosive coating, and relates to the technical field of polymer composites.The preparation method of the h-BN / PI high-temperature-resistant anticorrosive coating comprises the steps that under the protection of inert atmosphere, aromatic diamine containing impurity element five-membered rings and aromatic dianhydride containing ether bonds are taken and subjected to a polymerization reaction in a polar aprotic solvent, and the h-BN / PI high-temperature-resistant anticorrosive coating is obtained. A polyamide acid solution is obtained; performing ultrasonic-assisted liquid phase stripping on the micron-sized hexagonal boron nitride to obtain single-layer hexagonal boron nitride; adding the single-layer hexagonal boron nitride into the polyamide acid solution for multiple times, and uniformly stirring to obtain a hexagonal boron nitride / polyimide composite solution; and coating the hexagonal boron nitride / polyimide composite liquid on a to-be-coated surface, and carrying out gradient heating curing to obtain the h-BN / PI high-temperature-resistant anticorrosive coating. The h-BN / PI high-temperature-resistant anticorrosive coating based on interaction of multiple hydrogen bonds has relatively good high temperature resistance, relatively good resistance mechanical property and excellent corrosion resistance.

The invention discloses an extrusion process multi-parameter dynamic cooperative control method and system based on deep learning, and belongs to the technical field of high polymer material processing control, the extrusion process multi-parameter dynamic cooperative control method and system based on deep learning comprises the following specific steps: 1, data acquisition and preprocessing, the method comprises the following steps: acquiring multi-source time sequence data in an extrusion production process in real time through a sensor system, and preprocessing the data to form a standardized data set; the multi-source time sequence data comprises equipment operation parameters, process physical parameters and environment parameters. According to the method, the control system is endowed with powerful nonlinear time sequence prediction and multi-parameter collaborative decision-making capabilities through deep fusion of deep learning and reinforcement learning technologies, the quality trend can be accurately predicted, a collaborative control instruction can be given prospectively, and the problems of parameter coupling and control lag are effectively solved.

The invention discloses a flame-retardant ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The flame-retardant ABS composition provided by the invention comprises the following components in parts by mass: 50-80 parts of ABS resin; 8 to 12 parts of styrene-acrylonitrile copolymer; 3 to 5 parts of styrene-acrylonitrile-maleic anhydride terpolymer; 2 to 6 parts of a fluorine-containing maleimide copolymer; 5 to 15 parts of graphite nanosheet modified high rubber powder; 12 to 18 parts of brominated flame retardant; 3-7 parts of a phosphorus-based flame retardant; 0.1-1 part of a processing aid; the phosphorus-based flame retardant is prepared from the following components in parts by mass: 80 to 95 parts of diethyl phosphinate; 0.3 to 3 parts of ethyl butyl phosphinate; 0.1 to 2 parts of ethyl phosphonate; and 5 to 20 parts of melamine polyphosphate. The flame-retardant ABS composition prepared by the invention is good in flame retardant property, good in welding strength and low in cost.

The invention relates to the field of high polymer materials, and discloses a high-wear-resistance elastomer sole material and a preparation method thereof.The material comprises an elastomer matrix and surface-modified boron nitride nanosheets; the elastomer matrix comprises a first dynamic network and a second dynamic network which are formed through crosslinking of dynamic covalent bonds, and the first dynamic network and the second dynamic network are based on different types of dynamic covalent bonds and have different dissociation activation energy barriers or external stimulus response conditions. The surface-modified boron nitride nanosheet and the second dynamic network form a selective interface enhancement effect; the preparation method comprises the steps of polymer functionalization, nanosheet surface modification, melt blending reaction net forming, forming and the like. The obtained elastomer sole material not only has excellent wear resistance and mechanical properties, but also can realize self-repair of graded response aiming at damages of different degrees, and the service life of the material is remarkably prolonged.

The invention relates to the technical field of high polymer material processing, in particular to a blow molding method of a composite toughened film, which comprises the following steps: step 1, preheating matrix resin in preheating equipment; 2, feeding the mixed raw materials into a double-screw extruder for melt blending; 3, feeding the dried composite particles into a hopper of a single-screw blow molding extruder; 4, adjusting the air volume and the air pressure of the cooling system according to the monitoring result; and 5, the formed film pipe is folded into a flat shape through a guide component and led out through a traction roller, the traction speed and the extrusion speed are coordinated to control the traction ratio, corona treatment is conducted on the surface of the thin film to improve the surface energy, then rolling tension is controlled for rolling, and the rolling tension is controlled according to the elasticity and thickness of the thin film to prevent excessive stretching or loosening. The uniform distribution and proper compatibility of the composite toughening component improve the toughness of the film, and maintain the strength and barrier property of the film.

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-strength papermaking forming net fiber. Comprising the following raw materials in parts by weight: 75-90 parts of polyethylene glycol terephthalate, 5-15 parts of polybutylene terephthalate, 3-10 parts of a modified fiber filler, 2-5 parts of modified graphene, 2-8 parts of silicon dioxide, 0.5-2 parts of a silane coupling agent KH-560, 1-3 parts of an anti-hydrolysis agent, 0.5-1.5 parts of an antioxidant and 0.3-1 part of a lubricant. Wherein the modified fiber filler is prepared by sequentially carrying out modification processes such as silane coupling agent, citric acid-glycerol esterification, iron bismuth oxide loading and the like on glass fibers; the modified graphene is prepared by introducing dopamine, cerium ions and glycidyl methacrylate for modification. The mechanical strength, the hydrolysis resistance and the wear resistance of the fiber are remarkably improved through the synergistic effect of all the components and the melt spinning-multi-stage stretching process, and the fiber is particularly suitable for a forming net of a high-speed paper machine.

The invention relates to the technical field of polymer photoelectric materials, in particular to a preparation method of a supramolecular gel electrolyte. The method comprises the following steps: esterifying tetraphenylethylene alcohol and methacryloyl chloride to form tetraphenylethylene methacrylate, and performing staged linear heating polymerization on the tetraphenylethylene methacrylate, 3-(methacrylamido) propyl dimethyl 3-thiopropyl ammonium oxide inner salt, acrylic acid, tetraphenylethylene methacrylate and 4-vinylpyridine under the action of ammonium persulfate to obtain a tetraphenylethylene copolymer. And finally, soaking in a lithium chloride aqueous solution to obtain the supramolecular hydrogel electrolyte. The hydrogel obtained by the invention has high mechanical strength and high ionic conductivity, and is suitable for energy storage devices such as flexible supercapacitors and the like.

The invention discloses injectable hydrogel for photo-thermal adjuvant therapy of periodontitis and a preparation method, and belongs to the technical field of high polymer material preparation, the preparation method comprises the following steps: reacting MXene dispersion liquid with epigallocatechin gallate and MgSO4; then sequentially carrying out ultrasonic treatment, centrifugation, washing and freeze-drying to obtain a multifunctional nanosheet MP-Mg; adding the multifunctional nanosheet MP-Mg into an oxidized gellan gum aqueous solution, and carrying out a mixed reaction to obtain a solution A; mixing the quaternary ammonium salt chitosan aqueous solution and the carboxymethyl chitosan aqueous solution in equal volume, and reacting to obtain a solution B; and mixing the solution A and the solution B in equal volume for reaction. The hydrogel prepared by the preparation method disclosed by the invention has injectability, photo-thermal responsiveness, biological membrane penetrability, synergistic antibacterial property and long-acting anti-inflammatory property, and an innovative and practical photo-thermal adjuvant therapy platform is provided for clinical treatment of periodontitis.

The invention relates to the technical field of high polymer materials, and discloses an aromatic polyurethane composition, a preparation method and an aromatic thin-layer fabric. Eugenol is used as a functional chain extender to be introduced into a polyurethane molecular chain, aromatic microcapsules are compounded to prepare the aromatic polyurethane composition, the aromatic polyurethane composition is applied to fabric finishing, and the antibacterial property, the aroma, the wrinkle resistance and the washing fastness of the fabric are synergistically improved.

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 application relates to the technical field of material testing, and relates to a high polymer material testing method and system based on image analysis, which comprises the following steps: collecting images of high polymer materials to obtain high polymer material images, performing pretreatment operations to obtain pretreated material images, identifying a defect region set in the pretreated material images, performing feature extraction on the defect regions to obtain defect region parameters, comparing the defect region parameters with defect thresholds to obtain defect deviation values, judging the defect conditions of the defect regions, confirming the high polymer materials as preliminary qualified materials if all the defect conditions are acceptable defects, performing accelerated aging tests to obtain aging test materials, performing image detection on the aging test materials to obtain detected defect regions, comparing the defect regions with the detected defect regions to obtain defect region expansion values, and obtaining material detection results. The application can solve the problem of low testing result accuracy in the current high polymer material testing process.

The utility model discloses a multi-filtering-form multifunctional sewage blocking treatment system for a riverway, which comprises a group of soft enclosures which are sequentially arranged along the riverway to form a plurality of independent water purification areas, floating plants and ecological plant floating beds are arranged in the soft enclosures, and a vertical bank slope automatic liftable river water body filtering device is arranged between the soft enclosures. According to the system disclosed by the utility model, through the innovative design of the filter cloth and the application of a plurality of soft enclosures, step-by-step filtration and regional division of a water body are realized, and the filtration efficiency is improved. Meanwhile, the system adopts a hydrophilic high polymer material and a super-hydrophobic high polymer material, and combines biological filtration and physical filtration, so that the water quality is effectively purified. The system is further provided with an in-situ functional treatment area, and the water treatment efficiency and effect are improved by planting aquatic plants and adding functional filler.

The invention discloses silencing and mildew-proof organic silica gel as well as a preparation method and application thereof, and belongs to the technical field of organic silicon binding material polymers. Comprising the following components in parts by weight: 35-45 parts of nano calcium carbonate, 32-40 parts of hydroxyl-terminated polysiloxane, 5-9 parts of silencing powder, 0.5-2.5 parts of glass fiber powder, 5-9 parts of a hyperbranched polymer, 2-5 parts of a hydrophobic surface modifier, 1.5-3 parts of color paste, 1-2 parts of a water-based coupling agent, 1-2 parts of a cross-linking agent, 0.5-2.5 parts of a mildew preventive, 0.4-2 parts of a composite titanide and 0.4-0.7 part of nano silver powder. According to the invention, the nano silver powder and the mildew preventive are compounded, and an inorganic sterilization system is combined, so that broad-spectrum environment-friendly bacteriostasis is realized, and high-humidity long-acting protection is met; the powder is subjected to hydrophobic treatment, moisture is blocked, and high adhesion is kept; silencing powder serves as a core, a sound absorption network is cooperatively formed, the noise reduction capacity is improved, and the device is suitable for multiple scenes.

The invention discloses a water-based PHA (Polyhydroxyalkanoate) coating and PHA extrusion layer compounded paper-based high-barrier material as well as a preparation method and application thereof, and belongs to the technical field of biodegradable high polymer materials and environment-friendly packaging. According to the scheme, a double-component system with a specific melting point difference is innovatively introduced to construct the water-based pre-coating layer, and efficient sealing and strong anchoring of a rough base material can be achieved under the extremely low coating weight by means of the double mechanisms of'microcosmic leveling and interface thermal fusion '. Compared with a traditional thick-layer lamination process, the material achieves more excellent barrier integrity and oil-resistant and moisture-resistant performance through a thinner extrusion surface layer, the moisture-resistant and oxygen-resistant performance is remarkably improved, and meanwhile the requirement for puncture resistance of dry and hard food packaging materials is thoroughly met through the unique double-layer system stress balance design. The material does not contain fluorine additives, is completely biodegradable, and meets the high-standard requirements of food safety and compliance.

The invention provides a degradable sodded strip for ecological restoration and a preparation method thereof, and belongs to the technical field of sodded strips, the degradable sodded strip comprises an upper-layer fiber web, a middle-layer seed and nutrient layer and a lower-layer grid which are sequentially laminated and compounded from top to bottom; the upper-layer fiber web is made of a hydrophilic degradable material and is used for absorbing moisture and preserving soil moisture; the middle seed and nutrient layer comprises plant seeds and a nutrient controlled release unit; the lower-layer grid is a three-dimensional grid which is made of a degradable high polymer material, has a three-dimensional communicated micropore structure and is used for mechanically guiding root growth; the nutrient controlled release unit is a microcapsule which takes a fertilizer as a core material and takes an environment response type polymer as a wall material, and the microcapsule is anchored in the fiber interweaving nodes of the lower layer grid through a cross-linking agent. According to the invention, environmental response type precise controlled release of plant rhizosphere nutrients and three-dimensional mechanical guidance of a root system growth path can be realized, and the utilization rate of the fertilizer and the survival rate and long-term stability of vegetation recovery under poor site conditions such as side slopes, river banks and mines are effectively improved.

The invention discloses a degradable express bag material and a preparation method thereof, and relates to the technical field of high polymer materials. The invention discloses a degradable express bag material. The composite material is prepared from the following raw materials in parts by weight: 40 to 50 parts of poly (butylene adipate-co-terephthalate), 20 to 30 parts of polycaprolactone, 5 to 8 parts of modified bamboo fiber, 2 to 4 parts of modified nano montmorillonite, 3 to 6 parts of tributyl citrate, 0.1 to 0.3 part of antioxidant 1076, 1 to 2 parts of iron dithiocarbamate master batch, 2 to 3 parts of maleic anhydride grafted poly (butylene adipate-co-terephthalate) and 0.3 to 0.6 part of zinc stearate. 0.1 to 0.3 part of baicalein; and 1 to 3 parts of chitosan-sorbitol composite coating liquid. According to the degradable express bag material, poly (butylene adipate-co-terephthalate) and polycaprolactone are used as main degradable raw materials, modified bamboo fibers and modified nano-montmorillonite are matched to enhance the mechanical property, an antioxidant 1076, baicalein and the like are added to guarantee the stability and functionality, temperature is accurately controlled in the preparation process, multi-step modification is adopted for optimizing component combination, and the degradable express bag material is prepared. The performance is improved through the composite coating, degradability is achieved, and good usability is achieved.

The invention provides copolymerized flame-retardant nylon containing nitrogen and phosphorus as well as a preparation method and application of the copolymerized flame-retardant nylon. The copolymerized flame-retardant nylon containing nitrogen and phosphorus is formed by copolymerizing a structural unit I and lactam or copolymerizing the structural unit I, diamine and binary acid, the nitrogen and phosphorus-containing copolymerized flame-retardant nylon belongs to a halogen-free flame-retardant environment-friendly high polymer material and is intrinsic flame-retardant nylon, so that the problems of flame retardant migration, compatibility with a base material and the like do not exist, excellent flame-retardant performance can be achieved under the condition of relatively low introduction amount of a flame-retardant structural unit, and meanwhile, excellent mechanical property and spinnability can be kept.

The invention relates to the technical field of polymer composite materials, in particular to a carbon fiber reinforced nylon 66 / polyphenylene sulfide composite material and a preparation method thereof.The carbon fiber reinforced nylon 66 / polyphenylene sulfide composite material is prepared from, by weight, 40-55 parts of nylon 66, 30-45 parts of polyphenylene sulfide, 15-30 parts of carbon fibers, 5-6 parts of compatilizer, 0.8-1.2 parts of antioxidant and 3-4 parts of flexibilizer, the flexibilizer is ethylene-octylene copolymer grafted maleic anhydride, the grafting rate is 1.2-1.5%, the flexibilizer is ethylene-octylene copolymer grafted maleic anhydride, the grafting rate is 0.8-1.0%, and the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168 according to a mass ratio of 1: 1. The composite material prepared by the invention is suitable for medium-high temperature scenes, not only solves the problems of insufficient high temperature resistance and poor mechanical properties of traditional materials, but also has good processability and environmental tolerance.

The invention relates to the technical field of co-extrusion molding, in particular to a multi-layer co-extrusion molding method of a building composite membrane material, which comprises the following steps: melting and plasticizing a polymer mixture of each layer, and then synchronously co-extruding to obtain a composite tubular melt blank; injecting gas into the composite tubular melt blank and drawing to obtain a composite tubular bubble; judging whether the preparation of the composite tubular vesicle reaches the standard or not according to the vesicle form characterization value; cooling and curing the composite tubular film bubbles reaching the standard to obtain a composite tubular film; when it is judged that the preparation of the composite tubular membrane does not reach the standard according to the circumferential cooling uniformity characterization value, an adjustment strategy when the preparation of the composite tubular membrane does not reach the standard is determined according to the circumferential wind speed extreme value ratio of the cooling wind ring; and flattening and rolling the composite tubular membrane reaching the standard to obtain the composite membrane material for the building. The co-extrusion forming efficiency of the composite membrane material for the building is improved.

The invention relates to the technical field of high polymer materials, and discloses a conductive shielding material for a high-voltage cable. Comprising the following components in parts by weight: 40 to 70 parts of main body polyolefin resin, 10 to 30 parts of ethylene-vinyl acetate copolymer, 5 to 15 parts of maleic anhydride grafted polyolefin, 20 to 40 parts of surface modified conductive carbon black, 0.5 to 2 parts of peroxide cross-linking agent, 0.5 to 3 parts of functionalized silane coupling agent, 0.1 to 1 part of processing aid and 0.1 to 1 part of antioxidant, the surface modified conductive carbon black is high-structure conductive carbon black which is subjected to plasma oxidation treatment, solution graft polymerization and surface coupling agent pretreatment. The conductive carbon black is subjected to multi-step surface modification including plasma oxidation, solution graft polymerization and surface coupling agent pretreatment, and the in-situ chemical bonding effect of maleic anhydride grafted polyolefin is matched, so that the agglomeration problem of the conductive carbon black caused by high surface energy is effectively solved.

The invention relates to the technical field of polymer composite materials, and discloses a refining treatment method of a bamboo fiber ultra-nano micro powder and natural polymer blended material, which comprises the following steps: (a) premixing bamboo fiber ultra-nano micro powder and a deep eutectic solvent to obtain a premix and realize in-situ activation; (b) adding the premix and a natural polymer matrix from a main feed port of a double-screw extruder; and (c) in the melt blending process, adding a dynamic interface locking agent through a side feeding port arranged at the downstream of the main feeding port, and then extruding and granulating. A staged dynamic compatibilization process is adopted, a hydrogen bond network of bamboo fibers is destroyed by using a deep eutectic solvent to promote shearing dispersion of the bamboo fibers in the front section, and stable interface bonding is constructed in the rear section through a dynamic interface locking agent after dispersion is completed. The method synergistically solves the conflict between dispersion and interfacial compatibilization, so that the composite material has good comprehensive performance.

The invention discloses a coil structure-based length self-sensing method for high polymer twisted artificial muscle, which comprises the following steps of: firstly, enabling the artificial muscle to be equivalent to N equidistant circular current loops, establishing an inductance calculation formula by combining a Biot-Savart law and a magnetic field superposition principle, and breaking through the limitation of a traditional solenoid model on a helical angle; then through MATLAB numerical simulation and iterative computation, fitting to obtain a power function describing the relation between inductance and length; and finally, proposing a parameter dynamic correction mode based on single-time initial inductance measurement according to complex factors such as actual magnetic flux leakage and skin effect, and realizing rapid adaptive calibration by adjusting a parameter b. In a word, the method creatively combines theoretical modeling with experimental correction, the sensing precision in a dynamic stretching scene is remarkably improved while the inductance-length macroscopic trend prediction capability is ensured, dependence on a large amount of experimental data is not needed, and the method has good engineering applicability and is worthy of popularization.

The invention discloses a method for preparing micro-nano fibers through needle-free electrostatic spinning equipment assisted by an ion blower gun, and belongs to the technical field of spinning. The method specifically comprises the following steps: S1, dissolving a high-molecular polymer in a proper solvent to prepare a spinning precursor solution; and S2, preparing the micro-nano fiber from the spinning solution on a suitable collection surface by using an ion blower gun assisted needleless electrostatic spinning device. Through the synergistic effect of directional airflow generated by the ion blower gun and a controllable electric field, fiber surface charges are effectively neutralized, the jet instability is inhibited, and the controllability of a fiber flight path is improved. Meanwhile, the ionic wind assists in enhancing interface attachment between the fiber and the collector, uniform deposition is promoted, and the compactness and adhesive force of the fiber membrane are remarkably improved. According to the method, chemical modification does not need to be carried out on a material system, the intrinsic performance of the fiber is kept, universality and expandability are achieved, and a new path is provided for continuous preparation of the high-performance micro-nano fiber.

The invention relates to the technical field of high polymer materials, and discloses self-repairing bio-based polyester resin for a matte powder coating as well as a preparation method and application of the self-repairing bio-based polyester resin. The bio-based polyester resin is prepared from the following preparation raw materials in percentage by mole: 20 mol% to 40 mol% of bio-based flexible diol, 20 mol% to 35 mol% of bio-based furandicarboxylic acid, 10 mol% to 25 mol% of isosorbide, 5 mol% to 25 mol% of itaconic acid, 1 mol% to 15 mol% of long-chain bio-based aliphatic dibasic acid, 1 mol% to 10 mol% of bio-based citric acid, 0.1 mol% to 2.0 mol% of zinc acetylacetonate, 0.1 mol% to 1.0 mol% of a microcapsule corrosion inhibitor, 0.1 mol% to 1.0 mol% of an esterification catalyst and 0.1 mol% to 1.5 mol% of an antioxidant. The bio-based polyester resin does not contain petroleum-based monomers and is high in biochar content.

The invention provides a medical implant, a preparation method thereof and an artificial knee joint. The medical implant comprises a macromolecular porous stent and a hydrogel composite material at least filled in pores of the macromolecular porous stent, and the material of the macromolecular porous stent comprises a degradable macromolecular material and carbon nanotubes distributed in the degradable macromolecular material. The hydrogel composite material comprises a hydrogel material matrix and seed cells distributed in the hydrogel material matrix. According to the invention, the degradable high polymer material and the hydrogel material are combined, the carbon nanotubes are introduced into the degradable high polymer material, and meanwhile, seed cells are arranged in a hydrogel material matrix, so that the implantable stent material which has proper degradation performance and good mechanical properties and is renewable is provided.

The invention relates to the technical field of fault prediction and health management, and discloses a membrane envelope wire breakage detection method, which comprises the following steps: constructing a static impedance reference model containing viscoelastic characteristics, and extracting a time constant representing the physical relaxation velocity of an insulating material; performing phase correction operation on the instruction motion attitude coordinate by using the instant motion velocity vector and the time constant to obtain an equivalent physical attitude coordinate; and querying theoretical electrical characteristic parameters in the static impedance reference model by using the equivalent physical attitude coordinates, and carrying out difference calculation on the theoretical electrical characteristic parameters and the measured values to calculate a residual error characteristic sequence so as to evaluate the health factors. And due to measurement reference deviation caused by viscoelasticity lag of the high polymer material, accurate capture and trend prediction of weak early damage signals are realized.

The invention discloses a halogen-free compound flame retardant and application thereof in an antistatic nylon 66 composite material, and belongs to the technical field of polymer composite materials. The halogen-free compound flame retardant is prepared by compounding 68 parts of an organic aluminum hypophosphite flame retardant, 20 parts of a nitrogen-phosphorus intumescent flame retardant, 10 parts of a two-dimensional layered inorganic substance and 2 parts of a coupling agent through a high-speed mixing and drying process. The halogen-free compound flame retardant is blended with nylon 66, reinforced fibers, an antioxidant and the like, and the composite material is prepared through melt extrusion. According to the compound system, the total dosage of the flame retardant is remarkably reduced, the V-0 flame retardant grade is still achieved under the condition that the thickness is 0.8 mm, and the limit oxygen index exceeds 32%. The composite material has excellent flame retardancy and antistatic property while maintaining good mechanical properties, is suitable for a high glass fiber content system, effectively solves the problems of high flame retardant addition amount, difficult processing, high cost and the like in the prior art, and has the advantages of simple process and excellent comprehensive performance.

The invention discloses a gas separation mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas membrane separation. The mixed matrix membrane comprises a high polymer material matrix and a porous material, and through hydrogen-bond interaction formed by the high polymer material matrix and the porous material, the interfacial compatibility between a filler and the polymer matrix and the dispersity of the filler are remarkably enhanced; the pore material is used as a pore structure regulator, improves the chain accumulation mode of a polymer matrix and provides a selective gas separation window, and the gas screening capacity of the membrane is remarkably improved through the synergistic effect of the pore material and the pore structure regulator. The mixed matrix membrane is prepared by adopting a solution pouring method, the process is simple, the repeatability is high, large-area preparation is easy, the cost is low, the method is suitable for the fields of helium separation, hydrogen purification, natural gas purification, biogas purification and carbon capture, and the application prospect is wide.