4618 results about "Poly ethylene" patented technology

The invention discloses high-thermal-conductivity carbon black and a preparation method and application thereof, and relates to the technical field of carbon black modification.The preparation method of the high-thermal-conductivity carbon black comprises the following steps that carbon black is subjected to oxidation treatment, silanization treatment and tannic acid coating treatment, and modified carbon black is obtained; preparing a graphene / boron nitride / modified carbon black multi-dimensional filler; carrying out primary modification on the graphene / boron nitride / modified carbon black multi-dimensional filler by adopting lignin, polyvinylpyrrolidone and samarium chloride, and then carrying out secondary modification by adopting 6-aminocaproic acid to obtain the high-thermal-conductivity carbon black. The high-thermal-conductivity carbon black prepared by the invention not only has good dispersity, but also can well improve the thermal conductivity and mechanical properties of a rubber matrix.

The invention discloses a temperature / CO2 dual-response zwitterionic hydrogel profile control agent, which is prepared by taking a monomer A, a monomer B and a monomer C as raw materials, adding a cross-linking agent and an initiator, and carrying out polymerization reaction in a water medium. The monomer A is selected from any one of acrylamide, acrylic acid and 1-vinyl-2-pyrrolidone; the monomer B is selected from any one of [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, 2-methacryloyloxyethyl phosphorylcholine and 3-((2-(methacryloyloxy) ethyl) dimethylamino) propionic acid inner salt; and the monomer C is selected from any one of 2-(dimethylamino) ethyl methacrylate, dimethylamino propyl methacrylamide and polyethyleneimine. The profile control agent has double swelling mechanisms, has outstanding temperature and salt resistance, resists 220000 mg / L of mineralization water, is suitable for high-salt reservoirs, and is good in long-term aging property.

The invention discloses a machine learning assisted polyethylene reaction performance prediction model training method, prediction method and device. The method comprises the following steps: acquiring a training set; screening feature items used for model training; obtaining a gradient boosting regression model for catalytic activity, a gradient boosting regression model for molecular weight and a gradient boosting regression model for molecular weight distribution; extracting feature items for model training from the data of the training set so as to obtain feature vectors; and respectively inputting the feature vectors into each model so as to train each model, thereby respectively obtaining hyper-parameters of the trained gradient-boosted regression model for catalytic activity, hyper-parameters of the trained gradient-boosted regression model for molecular weight and hyper-parameters of the trained gradient-boosted regression model for molecular weight distribution. According to the method, a model relationship between input characteristics and polymerization results (including catalytic activity, molecular weight, molecular weight distribution and the like) is established through training set learning.

In some embodiments, a cable can include an electrically conductive inner core. A first insulation layer can be disposed about the inner core. An electrically conductive layer can be disposed about the first insulation layer. A second insulation layer can be disposed about the electrically conductive layer. A first polymer jacket can be disposed about the second insulation layer. The first polymer jacket can include a first layer of armor strength members disposed therein. A second polymer jacket can be disposed about the first polymer jacket. The second polymer jacket can include a second layer of armor strength members disposed therein. An outer polymer jacket can be disposed about the second polymer jacket. At least one of the first polymer jacket, the second polymer jacket, and the outer polymer jacket can be formed from an aliphatic polyketone polymer, an ethylene-propylene copolymer, a polyolefin elastomer, a polypropylene, or a cross-linkable polyethylene.

The invention belongs to the technical field of water electrolysis hydrogen production diaphragms, and relates to coating slurry for a composite diaphragm in an alkaline electrolytic cell and a preparation method of the coating slurry. The coating slurry comprises a high-molecular polymer, an inorganic hydrophilic oxide, a polymer electrolyte, a pore-foaming agent and an organic solvent. The high-molecular polymer is polysulfone, and the inorganic hydrophilic oxide is titanium dioxide; and the polymer electrolyte is acacia gum. And the pore-foaming agent is polyvinylpyrrolidone. Titanium dioxide is used as a filler, so that the hydrophilicity of the hydrophobic polysulfone membrane can be improved, and the transfer of hydroxyl ions is facilitated. Hydroxyl, amino and other hydrophilic groups of the acacia gum are migrated to a membrane-water interface, and the groups and a membrane matrix are combined to form a hydrogen bond network, so that the stability and the water adsorption capacity of the membrane are enhanced, and the composite membrane with low surface resistance, smooth surface, compact coating and good mechanical capacity is obtained. The nylon and the acacia gum are adopted, cost is low, and large-scale production is facilitated.

The invention relates to the technical field of asphalt modifiers, and particularly discloses an asphalt regenerant as well as a preparation method and application thereof. The asphalt modifier comprises an oil phase, a polymer phase, a nano reinforced phase and a functional additive phase, wherein the oil phase comprises petrochemical oil and vegetable oil; the polymer phase comprises four-arm radiation star-shaped SBS and a rubber powder lysis solution; the nano reinforced phase comprises silane coupling agent modified nano montmorillonite and graphene; the functional additive phase comprises maleic anhydride grafted polyethylene and sucrose ester. The asphalt regenerant provided by the invention is suitable for various types of aged asphalt, in particular to aged polymer modified asphalt, each failure phase of the aged polymer modified asphalt is accurately repaired through a multi-phase synergistic mechanism, full-dimension regeneration of the aged polymer modified asphalt from a molecular scale to macroscopic performance is realized, and the asphalt regenerant has a wide application prospect. Excellent applicability and reliability are shown in regeneration of various types of aged asphalt, and a powerful guarantee is provided for high-quality implementation of road engineering.

The invention relates to hydrogel loaded with oxygen self-producing nanoparticles as well as a preparation method and application of the hydrogel. The preparation method comprises the following steps: 1, taking cross-linked methacrylamide silk fibroin and hyaluronic acid modified by arginine-glycine-aspartic acid peptide as base materials, and loading self-oxygen-producing nano particles CaO2 (at) PVP (at) Cu-EGCG, and the self-oxygen-producing nano particles CaO2 (at) PVP (at) Cu-EGCG are prepared by coating Cu-EGCG on calcium peroxide nano particles modified by PVP modified polyvinylpyrrolidone. The hydrogel can improve energy metabolism and regulate immune environment through dual mechanisms, realizes efficient promotion of myocardial repair, and provides a new strategy and thought for tissue regeneration and functional recovery after myocardial infarction.

The present invention discloses a pH-responsive pesticide slow-release hydrogel sphere and a preparation method thereof, belonging to the technical field of slow-release pesticides. The present invention uses carboxylated nanocrystalline cellulose modified by polyethyleneimine as a raw material, which is self-assembled with modified montmorillonite through electrostatic binding, and then loaded with pesticides in an organic solvent. Then, sodium alginate is used as a coating material and anhydrous calcium chloride is used as a cross-linking agent to prepare a pH-responsive pesticide slow-release hydrogel sphere of nanocrystalline cellulose composite montmorillonite by dropping, which is used for the slow release of pesticides in the soil environment. Under the optimal conditions, the encapsulation rate of fipronil in the organic solvent by the hydrogel sphere of the present invention is above 64.1 wt%, and the loading rate is above 67.3 wt%. In the soil environment with different pH values, the highest release rate of pesticides after 120 h is above 59.7%, and the pesticide release rate increases with the increase of pH until the hydrogel skeleton completely breaks, and the purpose of adjusting the pesticide release rate can be achieved by adjusting the pH.

The invention discloses an oxygen-sulfur double-vacancy modified SnO2 / SnS2 / C nano material as well as a preparation method and application thereof, and belongs to the technical field of electrode materials. The preparation method comprises the following steps: mixing a structure regulating agent with tin salt, dropwise adding alkali liquor, stirring, and carrying out suction filtration to obtain Sn6O4 (OH) 4; the preparation method comprises the following steps: adding glucose and polyvinylpyrrolidone into distilled water, stirring to form a uniform solution, adding Sn6O4 (OH) 4 into the uniform solution, stirring, and carrying out ultrasonic and hydrothermal reaction to obtain SnO2 / glucose; and calcining the SnO2 / glucose and a sulfur source in an inert atmosphere to obtain the SnO2 / SnS2 / C nano material modified by oxygen and sulfur double vacancies. The SnO2 / SnS2 / C disclosed by the invention is used for a lithium / sodium ion battery negative electrode, can effectively relieve volume expansion of tin-based oxysulfide and improve the conductivity of an electrode material, and shows high charge-discharge specific capacity, excellent rate capability and high-rate long-cycle stability.

The invention relates to the field of cables, and discloses a modified polyvinyl chloride composite material for cables and a preparation method thereof.The composite material comprises low-density polyethylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, nitrile rubber, modified graphene oxide, modified nano calcium carbonate and auxiliaries; the modified graphene oxide is prepared by reacting acylating chlorination of graphene oxide with an anti-aging derivative, the anti-aging derivative is prepared by reducing a benzoxazole-containing intermediate generated by a reaction of 2-amino-4-bromophenol and 4-cyanobenzaldehyde to obtain an aminated benzoxazole-containing intermediate, then the aminated benzoxazole-containing intermediate reacts with p-phenylenediamine, and then the product reacts with 3-(3, 4-dichlorophenyl)-1, 2, 3-triazole-3-one to obtain the anti-aging graphene oxide. 2, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride is subjected to a reaction to prepare the product. And the modified nano calcium carbonate is prepared by reacting phosphonitrilic chloride trimer with an amino silane coupling agent and 2-amino benzoxazole-5-borate and then grafting on the surface of the nano calcium carbonate. The composite material prepared by the invention has excellent flame retardance, heat resistance and long-acting oxidation resistance.

The invention relates to the technical field of metal wires, in particular to a low-voltage aluminum wire and a preparation method thereof, the sectional area of the wire is 35 square millimeters, the wire comprises an aluminum alloy conductor and an insulating layer, the aluminum alloy conductor comprises the following chemical components: 0.7-0.9% of magnesium, 0.4-0.6% of silicon, 0.15-0.25% of copper, 0.08-0.12% of zirconium, 0.05-0.09% of scandium, 0.03-0.07% of silver, 0.01-0.03% of erbium, 0.02-0.04% of vanadium and the balance of aluminum, and the microstructure of the aluminum alloy conductor is in gradient distribution. The center is ultra-fine grains, a transition region contains a nano precipitated phase, the surface layer is of a high-density dislocation and nano precipitated phase synergistic reinforcement structure, the insulating layer is of a double-layer composite structure, the inner layer is a crosslinked polyethylene modified layer, the outer layer is an ethylene-tetrafluoroethylene copolymer modified layer, the electric conductivity is improved to 58% IACS or above, and the tensile strength is improved to 280 MPa or above.

The invention discloses a Pt-loaded hierarchical pore HY molecular sieve double-effect catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, an acid solution and an HY molecular sieve are mixed, heated and stirred, and the hierarchical pore HY molecular sieve is obtained; then, Pt salt is loaded on the hierarchical pore HY molecular sieve through an impregnation method, and the hierarchical pore HY molecular sieve is dried, calcined and then reduced. The concentration of the acid solution is not higher than 0.1 mol / L; the catalyst is used for hydrocracking of polyethylene or polypropylene. According to the Pt-loaded hierarchical pore HY molecular sieve double-effect catalyst disclosed by the invention, Pt atoms have excellent C-H bond activation capability, meanwhile, the hierarchical pore HY molecular sieve carrier has an open connection mesoporous structure and an acid site, and the mesoporous structure constructed by acid pickling and dealumination is beneficial to diffusion of a reaction intermediate and improvement of the yield of a liquid product; more orifice acid can be exposed by surface erosion, so that the initial cracking of reaction raw materials is facilitated, and the catalytic performance is improved.

The invention discloses an antibacterial drug delivery system based on a dynamic response type microneedle patch and a preparation method, and belongs to the field of biomedical materials.The antibacterial drug delivery system comprises a substrate layer and a needle point layer arranged on the surface of the substrate layer, the substrate layer is a mixed matrix of polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP), and the needle point layer is made of nano-silver; the needle tip layer is a phenylboronic acid modified oxidized hyaluronic acid and polyvinyl alcohol composite system. The antibacterial drug delivery system based on the dynamic response type microneedle patch, namely the microneedle patch with the pH response drug release function, is suitable for antibacterial treatment of infectious wounds, the mechanical strength of the needle point layer is improved, it can be better guaranteed that a microneedle completely penetrates into the skin, and the delivery efficiency is improved; meanwhile, drug release can be responded according to the pH of a bacterial infection part, and the antibacterial effect is good.

The invention discloses a sheath material for a saline-alkaline-resistant dragging cable, a preparation method of the sheath material, the cable and the sheath material. The sheath material is prepared from the following raw materials in parts by weight: 40 to 45 parts of chlorinated polyethylene, 1.5 to 2.0 parts of dicumyl peroxide vulcanizing agent, 2 to 2.5 parts of triisocyanate vulcanizing agent, 0.1 to 0.3 part of ethylene thiourea accelerant, 0.05 to 0.15 part of anti-aging agent RD, 4 to 5 parts of metal oxide, 1 to 1.5 parts of paraffin, 8 to 10 parts of calcium carbonate, 15 to 21 parts of reinforcing agent, 1 to 1.5 parts of lead stearate, 0.5 to 1 part of lead sulfate tribasic, 1 to 1.5 parts of ultraviolet light absorber, 3 to 5 parts of epoxidized soybean oil and 8 to 8 parts of chlorinated paraffin. 9 parts of antimony trioxide and 3-4 parts of antimony trioxide. The cable has the advantages of ultraviolet resistance, no salt deposition, water resistance, tensile resistance, cold resistance and the like, can be used for a long time in a special operating environment, has the service life of at least more than 3 years, and avoids frequent replacement of the cable by a user.

The invention relates to the technical field of conductive materials, in particular to a high-concentration dispersion system and a preparation method thereof. The high-concentration dispersion system comprises a conductive agent, a dispersing agent, a solvent and a viscosity reduction auxiliary agent, the conductive agent is modified carbon nanotubes, the dispersing agent is modified polyvinylpyrrolidone, the solvent is N-methyl pyrrolidone or deionized water, and the viscosity reduction auxiliary agent is piperazine anhydrous; wherein the modified carbon nano tube is obtained by mixing and heating a carbon nano tube and a mixed acid solution of nitric acid and sulfuric acid, then cooling, filtering, washing, drying, then dispersing in 75% ethanol, and finally adding 3-[3-carboxyl allylamido] propyltriethoxysilane for modification; the modified polyvinylpyrrolidone is obtained by heating polyvinylpyrrolidone at 310-330 DEG C and then oxidizing the polyvinylpyrrolidone. The conductive agent content of the high-concentration dispersion system is high, the conductive agent accounts for 15%-20% of the high-concentration dispersion system by mass, and the high-concentration dispersion system is low in viscosity, high in dispersity and good in conductivity.

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The invention discloses an ultrahigh-strength prestressed concrete pipe pile and a preparation method, and relates to the technical field of building materials. The ultrahigh-strength prestressed concrete pipe pile comprises a core layer which is composed of 1.0%-2.0% by volume of chopped basalt fiber reinforced concrete, the fiber length is 8-12 mm, the diameter is 15-20 microns, and the compressive strength is larger than or equal to 130 MPa; the transition layer is composed of hybrid fiber reinforced concrete with the volume fraction of 3.0%-4.0%, steel fibers account for 60%-75%, polyethylene fibers account for 25%-40%, the length-diameter ratio of the steel fibers is 50-80, and the tensile strength is larger than or equal to 1200 MPa. Through gradient fiber reinforced structure design and preparation process innovation, the mechanical property, the production efficiency and the environmental friendliness of the prestressed concrete pipe pile are synergistically improved. Firstly, in the aspect of mechanical properties, the compressive strength is made to break through 130 MPa through the synergistic effect of the core layer basalt fiber and the high-activity superfine slag powder and is improved by 30% or above compared with a traditional C100 pipe pile, and meanwhile the shear strength is improved to 18 MPa or above through a transition layer steel-polyethylene hybrid fiber system.

The application provides a high-voltage cable preparation method and a high-voltage cable. The preparation method comprises the following steps: preparing modified polyvinyl chloride, wherein the modified polyvinyl chloride comprises polyvinyl chloride and a filler added into the polyvinyl chloride; taking 100 parts by weight of the polyvinyl chloride as a base material, and the filler comprises the following components in parts by weight: 1-2 parts of polyethylene, 2-3 parts of a filler, 2-3 parts of a lubricant and 2-5 parts of a toughening agent; extruding the modified polyvinyl chloride on the outer surface of a smooth metal sheath layer to form a modified polyvinyl chloride sheath, and the modified polyvinyl chloride sheath is bonded to the smooth metal sheath layer; and the smooth metal sheath layer is wrapped on the outer surface of a cable core. The high-voltage cable preparation method can greatly improve the flame-retardant performance of the high-voltage cable.

The invention relates to the field of cables, in particular to a rat-proof and termite-proof flame-retardant cable and a preparation method thereof, which are used for solving the problems of poor rat-proof and termite-proof effect and flame-retardant effect of the existing cable sheath material. According to the rat-proof and termite-proof flame-retardant cable sheath, the polyethylene resin, the polypropylene resin and the ethylene-vinyl acetate copolymer serve as main raw materials and are reasonably compounded, the advantages of the polyethylene resin, the polypropylene resin and the ethylene-vinyl acetate copolymer are synthesized, good basic performance is provided for the cable sheath, the basic magnesium sulfate whiskers and the boron-nitrogen-phosphorus complexing agent are added and coated, the basic magnesium sulfate whiskers and the boron-nitrogen-phosphorus complexing agent can cooperate with one another, and a multi-layer flame-retardant mechanism is formed; the flame-retardant performance of the cable sheath is remarkably improved, the safety of the cable in a fire disaster is improved, the mechanical property of the cable sheath is remarkably improved due to the existence of the coated basic magnesium sulfate whiskers, the damage to the cable caused by rat and ant biting is reduced, the rat and ant-proof agent is added into the cable sheath, the damage to the cable caused by rat and ant biting is further reduced, and the service life of the cable is prolonged. And normal operation of the cable in areas with frequent rat and ant activities is ensured.

The invention discloses lithium ion battery slurry and a coating process thereof, and belongs to the technical field of battery diaphragms. The lithium ion battery slurry comprises the following raw materials in parts by weight: 40-50 parts of ceramic powder, 10-15 parts of bio-based semi-aromatic polyamide, 10-15 parts of polyvinylidene fluoride, 35-45 parts of a solvent and 1-4 parts of a dispersing agent. The coating process comprises the following steps: A1, sequentially adding a solvent and a dispersing agent into a stirring tank, then adding ceramic powder, bio-based semi-aromatic polyamide and polyvinylidene fluoride, and uniformly stirring and mixing to obtain bio-based coating slurry; a2, feeding a polyethylene-based membrane into a coating device, coating by using the bio-based coating slurry prepared in the step A1, coating at least one side of a battery diaphragm by adopting a micro-concave roller coating mode, and drying and rolling the coated battery diaphragm to obtain a finished product of the ceramic-coated lithium battery composite diaphragm. The dispersing agent is used in the process of preparing the coating slurry, so that the mechanical property, the heat resistance and the adhesion property of the diaphragm can be improved.

A separator for a lithium battery having (a) a porous polymeric layer, such as a polyethylene layer; and (b) a nanoporous inorganic particle / polymer layer on both sides of the polymeric layer, the nanoporous layer having an inorganic oxide and one or more polymers; the volume fraction of the polymers in the nanoporous layer is about 15% to about 50%, and the crystallite size of the inorganic oxide is 5 nm to 90 nm.

The invention discloses a cerium-modified manganese-based NH3-SCR (Selective Catalytic Reduction) denitration catalyst as well as a preparation method and application thereof. The catalyst is obtained by uniformly mixing and stirring manganous nitrate, cerous nitrate, polyvinylpyrrolidone, citric acid and deionized water, stirring and evaporating to a gel state, drying to form a precursor, and roasting the precursor in an air atmosphere. Ce is used for modifying MnOx, polyvinylpyrrolidone and citric acid are used as a surfactant and a complexing agent in the preparation process of the catalyst, the interaction between Ce and Mn is enhanced, the phase of the catalyst is adjusted, and under the conditions of high NOx concentration (1000 ppm) and high space velocity (GHSV = 120,000 mL h <-1 > g <-1 >), the catalyst can be used for preparing the catalyst, and the catalyst can be used for preparing the catalyst. The catalyst has excellent low-temperature catalytic activity, a wide working temperature window and good reaction stability, and has good water resistance and sulfur dioxide poisoning resistance.

The invention discloses a bimetal MOFs-loaded electrostatic spinning fiber membrane for oil-water separation and a preparation method thereof, and belongs to the technical field of membrane separation, and the preparation method comprises the following steps: (1) preparing a hydroxyl-modified metal organic framework material MIL-53 (Al)-OH through a solvothermal reaction; (2) preparing an MIL-53 (Fe) precursor solution by using ferric salt, terephthalic acid, polyvinylpyrrolidone and an organic solvent, ultrasonically dispersing MIL-53 (Al)-OH in the MIL-53 (Fe) precursor solution, uniformly mixing, and soaking the electrostatic spinning fiber membrane in the MIL-53 (Fe) precursor solution for 1-3 hours; and (3) transferring the system in the step (2) into a reaction kettle, reacting at 130-150 DEG C for 10-15 hours to enable the bimetallic MOFs to grow on the surface of the electrostatic spinning fiber membrane, washing, and drying to obtain the bimetallic MOFs-loaded electrostatic spinning fiber membrane for oil-water separation. The bimetal MOFs-loaded electrostatic spinning fiber membrane has the advantages of good oil-water separation performance, strong antifouling ability and strong dye degradation ability.

The invention provides a preparation method and application of a quantum dot light-emitting diode based on interface modification, and belongs to the technical field of quantum dot materials. The preparation method comprises the following steps: (1) spin-coating PEDOT: PSS-4083 on ITO (Indium Tin Oxide) to obtain a hole injection layer; (2) spin-coating polyvinyl carbazole on the hole injection layer in the step (1) to obtain a hole transport layer; (3) spin-coating pyridine on the hole transport layer in the step (2) to obtain a modification layer; (4) spin-coating ZnCdS / ZnS quantum dot normal octane on the modification layer in the step (3) to obtain a quantum dot film; and (5) spin-coating an Mg-doped ZnO ethanol solution on the quantum dot film in the step (4), and performing high-vacuum evaporation to obtain the quantum dot light-emitting diode. Compared with an original device, the EQE of the prepared quantum dot light emitting diode is improved by 16.5%, and the highest brightness is improved by 12.5%.

The invention provides a traditional Chinese medicine gel patch for treating gouty arthritis and a preparation method thereof. The traditional Chinese medicine gel patch for treating gouty arthritis comprises at least a gel layer loaded with traditional Chinese medicine extracts; the traditional Chinese medicine extracts comprise the following raw materials: coix seed, phellodendron amurense, clematis root, radix scutellariae, atractylodes lancea, radix ophiopogonis, radix scutellariae, acer scutellariae, radix scutellariae, radix aconiti kusnezoffii, radix strychnii, frankincense, myrrh, angelica sinensis, safflower, cyathula root, radix paeoniae rubra, radix smilacis gracile, radix striatae, eucalyptus glomeratae, sophora flavescens, andrographis paniculatae, radix lobeliae, rhizoma coptidis, radix scutellariae, cassia twig, zanthoxylum bungeanum, and borneol; and a matrix of the gel layer comprises the following raw materials in parts by weight: silk fibroin, polyvinyl pyrrolidone, azido-polyethylene glycol-carboxylic acid, 1-ethynylcyclopropylcarboxylic acid, 2,5-dicarboxylic acid-3,4-ethylenedioxythiophene, and glycerol. The traditional Chinese medicine gel plaster of the present invention can achieve good therapeutic effects through percutaneous absorption.

The invention relates to the technical field of nondestructive testing, in particular to an ultrasonic phased array-based PE (Poly Ethylene) hot-melt joint nondestructive testing method and system, which comprises the following steps: acquiring material parameters in real time, establishing an anisotropic finite element model, dynamically compensating a sound wave path, spirally scanning a detection area, fusing and analyzing defect characteristics, optimizing three-dimensional imaging and the like. The system comprises an ultrasonic phased array probe array, a dynamic compensation controller, a six-axis mechanical arm and an imaging optimization engine. The invention solves or at least alleviates the problem of insufficient detection precision caused by non-uniform material anisotropy, dynamic density gradient and elastic modulus distribution in the nondestructive detection of the PE hot-melting joint in the traditional ultrasonic detection method, and provides the nondestructive detection method and system for the PE hot-melting joint based on the ultrasonic phased array.

The invention discloses a method for preparing a polyvinyl polyamide composite reverse osmosis membrane by coupling reversed-phase interfacial polymerization with lignosulfonate, which adopts a reversed-phase interfacial polymerization method and comprises the following steps: firstly adding an oil phase containing polyacyl chloride, and then adding a water phase containing amine monomers and lignosulfonate. Molecules of the lignosulfonate contain more sulfonate radicals, so that the lignosulfonate is endowed with hydrophilicity, meanwhile, a large number of active functional groups such as phenolic hydroxyl groups, alcoholic hydroxyl groups and carboxymethyl exist, and oxygen atoms, sulfur atoms and the like in the functional groups contain unbonded electron pairs and can participate in interfacial polymerization reaction to form a cross-linked structure; the trade-off effect of the flux and the rejection rate of the reverse osmosis membrane is broken, and the polyvinyl polyamide reverse osmosis membrane with high flux and high rejection rate is obtained. The raw material of the polyethylene base material is low in price, and the product can be applied to the fields of water treatment, seawater desalination, brackish water desalination and the like on a large scale.

A dry eye composition containing hypochlorous acid and a demulcent. The demulcent can be polyvinylpyrrolidoe with a molecular weight of 30-50 kDa. The composition can be applied to the surface of the eye with a dropper device or a spray dispenser. Critically, hypochlorous acid is stable in the dry eye composition and maintains its effectiveness at preventing microbial growth.

The invention relates to the technical field of heat dissipation materials, and discloses a graphite cooling fin of a multi-layer composite structure and a manufacturing process of the graphite cooling fin of the multi-layer composite structure. 15 to 25 parts of artificial graphite powder; 3 to 8 parts of an aniline-p-phenylenediamine copolymer; 2 to 6 parts of antimony oxide nano particles; 2 to 5 parts of urea; 1 to 3 parts of polyvinylpyrrolidone; the preparation method comprises the following steps: carrying out heat treatment on the artificial graphite film, and then carrying out mechanical pulverization; mixing the graphite oxide with an ethanol or water mixed solvent containing ammonia water; mixing the raw materials; performing vacuum defoamation and then coating on a base material; and performing carbonization treatment on the graphene film crude product, and performing lamination calendering treatment to form a final product. According to the technical scheme, the antimony oxide nano particles are adopted to synergistically adjust the heat conductivity, the effect of remarkably improving the transverse heat conductivity of the film body is achieved, the heat conductivity is enhanced, and material embrittlement caused by overfilling is avoided.

The invention relates to the technical field of cables, and provides a flame-retardant medium-voltage power cable and a preparation method thereof. The flame-retardant medium-voltage power cable comprises a conductor and a flame-retardant layer, the flame-retardant layer is prepared from the following raw materials in parts by weight: 65 to 75 parts of ethylene-vinyl acetate copolymer, 25 to 35 parts of polyolefin elastomer, 10 to 12 parts of maleic anhydride grafted polyethylene, 10 to 14 parts of phosphorus-nitrogen modified wollastonite, 8 to 10 parts of polydopamine / silane double-layer modified magnesium hydroxide, 3 to 5 parts of nano zinc borate, 0.6 to 1 part of antioxidant and 0.5 to 0.7 part of calcium stearate. According to the flame-retardant medium-voltage power cable prepared in the invention, the flame-retardant performance is improved, and the flame-retardant stability of the cable is also improved.