79 results about "Nano carbon" patented technology

This disclosure provides an optically active nanocomposite material having a textured substrate and a multilayer optical stack comprising multiple nanosheets. The nanosheets may be chiral and composed of materials such as transition metal chalcogenides, MXenes, or nanocarbon. The optically active nanocomposite material exhibits linear birefringence (LB) and linear dichroism (LD), and optionally circular dichroism (CD). The nanocomposite material also exhibits optical asymmetry. g The factor may be greater than or equal to 1. Furthermore, the nanocomposite material exhibits thermal stability, for example, remaining stable at temperatures above or equal to about 250 °C. This disclosure also provides different methods for preparing such nanocomposite materials using a layer-by-layer self-assembly (LBL) process.

The application relates to the technical field of aging processing, in particular to an aging device for nano calcium carbonate processing, which comprises an aging tank installed in a fixing base, a rotating shaft rotates in the aging tank, a stirring rod is connected to the outer side of the rotating shaft, a belt pulley A rotates on the upper end of the aging tank, belt pulleys B rotate on the two sides of the aging tank, reflux pipes are connected to the two sides of the aging tank, a connecting rod A and a reciprocating screw rod A rotate in the reflux pipes, a half gear rotates on the upper end of the belt pulley A, a gear is meshed with one side of the half gear, and a reset structure is connected to one end of the gear. When the device is used, an inert environment is gradually formed in the aging tank, so that oxidation reaction of nano calcium carbonate particles and slurry in an oxygen environment is prevented, product purity and performance are influenced, after the inert nitrogen fills the aging tank, oxygen can be effectively isolated, the surface of nano particles is prevented from being oxidized, and the chemical stability of the product is ensured.

This application discloses a negative curvature polycyclic aromatic hydrocarbon containing an eight-membered ring, its synthesis method, and its application, belonging to the field of organic synthesis. The synthesis method uses a haloacenaphthene derivative as a starting material. First, a tetrahalogenated key intermediate containing an eight-membered ring is constructed via a titanium tetrachloride-catalyzed cyclization tetramerization reaction. Subsequently, this intermediate undergoes a cyclization coupling reaction with an alkyne compound in the presence of a palladium catalyst, silver salt, and phosphine ligand to generate a negative curvature polycyclic aromatic hydrocarbon containing an eight-membered ring. The synthesis method of this application avoids multi-step precursor synthesis, resulting in a concise process. It allows for the flexible introduction of functional groups such as trifluoromethyl and silyl groups, improving the solubility and processability of the material. The obtained product exhibits a non-planar configuration, a narrow optical band gap, and excellent electron transport properties, making it suitable for applications... n Applications include semiconductors, chiral optoelectronic materials, and nano-carbon materials.

This application discloses a light-resistant and scratch-resistant gravure inkjet printing ink and its preparation method, belonging to the field of novel ink technology. The light-resistant and scratch-resistant gravure inkjet printing ink comprises the following raw materials in parts by weight: 38-45 parts of fluorosilicone modified polyacrylate emulsion, 7-11 parts of modified composite powder, 6-9 parts of nano carbon black, 1.2-1.8 parts of dispersant, 0.6-1.2 parts of leveling agent, 0.3-0.6 parts of defoamer, 1.5-2 parts of abrasion-resistant agent, 0.4-0.8 parts of AMP-95, and 25-35 parts of deionized water. This application limits the composition and weight of the inkjet ink, and uses fluorosilicone modified polyacrylate emulsion as the film-forming main body to endow the ink with low surface energy, high water resistance and excellent adhesion to film substrates; combined with modified composite powder, it effectively improves the dispersibility of nanoparticles, avoids agglomeration and clogging, and significantly improves the sun resistance and anti-aging performance. Overall, it takes into account high sun resistance, high scratch resistance, strong adhesion, environmental protection and low VOC, and is highly suitable for high-speed gravure inline inkjet printing scenarios.

The present application relates to the technical field of polyester degradable plastics, and particularly relates to a bio-degradable bubble film bag puncture resistance reinforcement process. The bio-degradable bubble film bag puncture resistance reinforcement process comprises the following steps: dust and oil removal on the surface of a formed bubble film bag, heat treatment to obtain a pretreated bubble film bag; soaking the pretreated bubble film bag in a Tris-HCl buffer solution, adding dopamine hydrochloride into the Tris-HCl buffer solution, air bubbling and ultrasonic treatment, vacuum drying to obtain a surface-activated bubble film bag; adding a silane coupling agent into an ethanol aqueous solution, stirring, adding nano calcium carbonate and graphene oxide into the ethanol aqueous solution, stirring, filtering, washing, vacuum drying to obtain an activated filler; adding polylactic acid and polylactic acid grafted maleic anhydride into dichloromethane, stirring until uniform, adding the activated filler into the dichloromethane, stirring, adding a leveling agent, continuing to stir, standing and defoaming, low-temperature spraying onto the surface of the surface-activated bubble film bag, roller compounding, heat preservation and natural cooling.

The utility model relates to the technical field of nano calcium carbonate production, in particular to a high-solid-content nano calcium carbonate drying device which comprises a drying box, a feeding port is formed in one end of the drying box, a discharging port is formed in the end, opposite to the feeding port, of the drying box, and a punching plate is fixedly arranged in the middle of the interior of the drying box. The punching plate divides the drying box body into an upper drying cavity and a lower air inlet cavity; a plurality of air outlets communicated with the upper drying cavity are formed in the drying box body, a plurality of impact components are further arranged in the upper drying cavity, a plurality of air inlets communicated with the lower air inlet cavity are formed in the drying box body, and the air inlets are connected with an air supply device; a vibration motor is arranged on the outer side wall of the drying box, and box fixing pieces are evenly arranged on the outer side of the bottom of the drying box. The drying device further comprises a bottom plate, bottom plate fixing pieces corresponding to the box body fixing pieces are arranged on the bottom plate, and the box body fixing pieces and the bottom plate fixing pieces are detachably connected with the vibration component. The drying and crushing device can synchronously realize drying and crushing, and is good in drying effect.

The application provides an inner light source coupling micro-nano carbon supply reinforced microalgae plastic removal and carbon fixation system and method, which comprises a light reinforcement module, a micro-nano gas oscillation carbon supply module, a photobioreactor main body and an algae plastic collection and resource utilization module; the light reinforcement module, the micro-nano gas oscillation carbon supply module and the algae plastic collection and resource utilization module are connected with the photobioreactor main body respectively; the light reinforcement module adds carbon quantum dots and plant hormone IAA into the photobioreactor main body, and realizes composite illumination in cooperation with illumination; the micro-nano gas oscillation carbon supply module transports micro-nano dispersed CO2 into the photobioreactor main body, and makes the deagglomeration of microplastics in water; the algae plastic collection and resource utilization module collects, processes and realizes resource utilization of the microalgae mixture adsorbing microplastics in the photobioreactor main body. The application aims to realize efficient removal of microplastics, efficient fixation of CO2 and resource utilization of biomass.

The application relates to a polypropylene filament needle-punched geotextile and a preparation method and application thereof, and belongs to the field of geosynthetic materials. The geotextile comprises a wear-resistant surface layer, a toughness intermediate layer and a drainage bottom layer, wherein the wear-resistant surface layer, the toughness intermediate layer and the drainage bottom layer are integrally formed through cross needle punching; the preparation raw material of the geotextile comprises, according to mass percentage, 80-88% of copolymerized polypropylene, 6-14% of a toughening agent, 2.5-4% of a composite anti-freezing agent, 1.5-2.5% of an anti-corrosive agent, 1.5-2.5% of a composite anti-aging agent and 0.5-1% of a dispersing agent; the toughening agent comprises POE and TPE; and the composite anti-freezing agent comprises ethylene glycol monostearate and nano calcium carbonate. The geotextile of the application adopts a compounded toughening system and cross needle punching to form a stable fiber network, the unique anti-freezing formula and fiber structure improve the freeze-thaw stability, the gradient pore size structure is combined with a modified liquid to improve the drainage efficiency, and the preparation process has high adaptability and is easy to popularize.

The application belongs to the field of isotropic graphite powder preparation, in particular to high-density isotropic graphite powder and a preparation method thereof. The raw material components of the graphite powder include modified mesophase pitch coke micro powder, needle coke micro powder, a composite binder and nano silicon carbide dispersant. The weight percentage of each raw material component is as follows: modified mesophase pitch coke micro powder 55-75%, needle coke micro powder 10-20%, composite binder 15-25% and nano silicon carbide dispersant 0.5-3%. The application combines the dispersion and skeleton enhancement of nano silicon carbide to make the green body obtain excellent compactness under a medium static pressure of 180-200 MPa, and high compactness can be achieved without high-pressure forming. After calcination and graphitization, the volume density of the product can reach 1.88-1.95 g / cm3, and the bending strength is 45-60 MPa, solving the problems of insufficient compactness and low strength of graphite products in the prior art.

This invention discloses a modified biodegradable film material, its preparation method, and its applications. The modified nano-sized calcium carbonate is prepared by modifying nano-sized calcium carbonate, with the addition of a silane coupling agent to prevent agglomeration, resulting in a uniformly dispersed nano-calcium carbonate slurry that exhibits modified properties. The modified film has a shorter degradation time, a more stable molecular structure, and increased antibacterial properties. The film preform is stretched longitudinally and laterally using a stretching device to obtain the film. The thickness and length of the film can be arbitrarily set according to actual production needs. The mulch film is a film used to cover the ground, primarily transparent or black, with functions such as warming and moisture retention, improving soil structure, and controlling pests and diseases. It is widely used in more than 40 kinds of crops, including grains, cotton, oilseeds, and vegetables, and can generally increase crop yields by 30%-50%. It does not require recycling after application and can naturally degrade after 6-9 months.

This invention provides a method for preparing nano-calcium carbonate, comprising the following cyclical processes: (1) pretreatment of dry carbide slag raw materials; (2) leaching Ca from the dry carbide slag with ammonium chloride solution. 2+ And perform solid-liquid separation to obtain a high-purity calcium chloride solution and ammonia. (3) Use the ammonia in (2) to absorb low-concentration CO2 flue gas to obtain a mixed solution of ammonium carbonate and ammonium bicarbonate; (4) Mix the mixed solution of ammonium carbonate and ammonium bicarbonate obtained in (3) with the calcium chloride solution obtained in (2) to obtain calcium carbonate precipitate and ammonium chloride solution; (5) Use the ammonium chloride solution obtained in (4) to evaporate and concentrate, and return to step (2) to complete the entire cycle process. This method uses the escaped ammonia produced by the traditional ammonium chloride leaching CO2 to dry carbide slag to absorb flue gas to prepare ammonium carbonate and ammonium bicarbonate. It not only achieves efficient conversion of low-concentration flue gas CO2, significantly reduces conversion costs, and improves economic feasibility, but also uses the high-concentration ammonium carbonate of the conversion product to produce nano-CaCO3, which has significant environmental and economic benefits.

The application discloses an absorbing material outer coating and a preparation method, relates to the field of outer coatings taking polysiloxane and fluorocarbon material as core components, and comprises the following components in proportion by weight: 35-45 parts of polysiloxane resin with a hydroxyl content of 3-5%; 15-25 parts of fluorocarbon resin with a solid content of 98%; 8-12 parts of nano carbon black with a particle size of 50-100 nm and a purity of 99%; 3-5 parts of flexible auxiliary agent; 1-2 parts of dispersing agent; 15-25 parts of solvent; and 0.5-1 part of curing agent. The compression-release cycle is that the agglomerates experience the cycle of 'extrusion crushing-dispersing uniformly-reextrusion', and the particle size gradually decreases; the spiral descending path is that the absorbing material gradually descends along a spiral track under the action of the gap between the stirring plates and its own gravity, the descending process is continuously gathered by the stirring plates, the descending speed is extremely slow, the residence time is prolonged, and the stirring can be more uniform in the limited space.

This invention relates to the field of nano-calcium carbonate preparation technology, and discloses a high-weather-resistant nano-calcium carbonate for MS adhesive and its applications. This invention constructs a Ti-Ta binary co-precipitated inorganic shell, which can effectively block ultraviolet radiation and inhibit the generation of photo-induced free radicals in nano-calcium carbonate. Combined with the hydrophobic, antifouling, and free radical quenching effects of the perfluoropolyether-thioether-based phosphite organic graft layer, a dual weather-resistant mechanism of "physical shielding + chemical stability" is formed. Furthermore, the perfluoropolyether segments of this invention are highly matched with the polyether backbone structure of the MS adhesive, which can significantly improve the interfacial bonding between the filler and the adhesive, reducing interfacial defects. The thioether-based phosphite, through strong coordination anchoring with calcium carbonate via carboxyl groups, avoids the problems of easy precipitation and interfacial debonding of traditional fatty acid modifiers, greatly improving the mechanical properties and long-term storage stability of the MS adhesive. The overall process parameters of this invention are clear and controllable, enabling large-scale production, and combining excellent performance with cost advantages.

The application discloses a kind of special nylon cable fiber of salt corrosion resistance of deep sea operation and preparation method thereof, including core layer and sheath layer, it is characterized in that, the mass ratio of core layer and sheath layer is 7:3;The core layer raw material includes: nylon 6 chip 88-92 parts, hyperbranched nylon toughening agent 2-4 parts, nano calcium carbonate whisker precursor 1-2 parts, high-pressure modifier 0.5-1 part, initiator 0.2-0.4 part;The sheath layer raw material includes: nylon 66 / polybutylene terephthalate blend chip 80-85 parts, silicon carbide powder 4-6 parts, sepiolite nanofiber 2-3 parts, seawater resistant modifier 1-2 parts, compatible agent 0.5-1 part, the special nylon cable fiber of salt corrosion resistance of deep sea operation and preparation method thereof disclosed in the application can tolerate the abrasion, extrusion, scratch of seabed rock, simultaneously has the characteristics of seawater corrosion resistance, deep sea high pressure resistance, low temperature fatigue resistance.

This invention provides a conductive wood-based filter, its preparation method, and its application, belonging to the field of water treatment technology. The invention provides a conductive wood-based filter comprising a wood matrix and nano-carbon material grafted with nano-zero-valent iron (ZVI) onto the surface and pores of the wood matrix. The conductive wood-based filter provided by this invention enables uniform dispersion of ZVI nanoparticles on the filter surface, solving the problems of easy agglomeration and difficult recovery of ZVI nanoparticles, and the ZVI nanoparticles possess a large effective specific surface area. The use of nano-carbon material combined with ZVI nanoparticles solves the problem of high electron transfer resistance during the ZVI nanoparticle reaction. When the conductive wood-based filter of this invention is used to filter water containing Cr(VI), the reaction is carried out in cathode mode by applying an electric field, which effectively alleviates the oxidation and passivation of ZVI nanoparticles, ensuring operational stability and improving reaction efficiency.

The application discloses a kind of composite nanometer aramid insulation paper with corona resistance and heat conduction performance and preparation and application, and the insulation paper is composed of aramid nanofiber matrix and the first functional filler and the second functional filler uniformly dispersed in aramid nanofiber matrix;The first functional filler is the boron nitride quantum dot treated by surface functionalization;The second functional filler is nano silicon carbide;The mass of boron nitride quantum dot treated by surface functionalization is 1%~15% of the mass of aramid nanofiber matrix, and the mass of nano silicon carbide is 0.5%~8% of the mass of aramid nanofiber matrix.The average particle size of boron nitride quantum dot treated by surface functionalization is 2nm~10 nm.The application solves the problems of lack of ultraviolet protection mechanism, uncontrollable filler distribution, complex process and limited heat conduction in the prior art, and significantly improves the corona resistance and heat conduction performance of the insulation paper through the synergistic effect of electric field regulation, ultraviolet protection and optimized distribution of composite filler.

A method for manufacturing phosphoric acid-based conductive particles for positive and negative electrodes, the method comprising the following steps: Step 500: taking multiple ceramic particles and a first alcohol aqueous solution, and mixing and grinding them using a grinder; Step 510: grinding the multiple ceramic particles to a size smaller than a certain value, then adding multiple lithium fluoride particles and organic materials to the grinder for further mixing and grinding to form a first mixed slurry; Step 520: taking a second alcohol aqueous solution, polyvinylpyrrolidone, sodium dodecyl sulfate, multiple first carbon nanotubes, and multiple graphene sheets, and thoroughly mixing them using a mixer to form a second mixed slurry; Step 530: adding the second mixed slurry to the grinder along with the first mixed slurry. Step 540: The above materials are taken out from the mill and placed in a vacuum concentrator to remove the first and second alcohol aqueous solutions to obtain a mixed powder; Step 550: The mixed powder is placed in a sintering furnace for sintering in a nitrogen atmosphere, and the temperature is gradually increased to a specific temperature to obtain the multiple conductive particles. The organic materials, polyvinylpyrrolidone, and sodium dodecyl sulfate will form multiple amorphous carbons under oxygen-free sintering. These multiple amorphous carbons will form an amorphous carbon layer covering the outer surface of each ceramic particle, and the multiple lithium fluoride particles, the graphene sheets, and the first carbon nanotubes will be distributed in the amorphous carbon layer to form multiple conductive particles.

This invention belongs to the technical field of solid waste resource utilization and CO2 adsorption materials, and relates to a method for preparing a derived nano-calcium-based CO2 adsorbent from shellfish waste. The method involves pretreating shellfish waste to obtain shell powder, preparing organic acid-modified carbon nanospheres from a soluble natural carbon source via a hydrothermal method, and then using a wet chemical method with the organic acid-modified carbon nanospheres as a template and the shell powder as a calcium source to allow the converted calcium carbonate to grow in situ on the carbon nanospheres to obtain a precursor. Finally, the precursor is prepared by calcination to obtain the derived nano-calcium-based CO2 adsorbent. This adsorbent has a temperature window of approximately 650–720 °C, an adsorption gas flow rate of 50–120 mL / min, and an adsorption capacity of 87.41% for various CO2 concentrations of 60–100%, with a decay rate controlled to approximately 13.44% after 10 adsorption cycles.

The present application relates to a kind of low resilience self-repairing wet-spraying concrete for exhaust shaft slope support, comprising the following parts: cement 20-35 parts, fine aggregate 25-45 parts, coarse aggregate 10-30 parts, water 8-18 parts, nano silicon dioxide 0.2-2 parts, nano calcium carbonate 0.2-1.5 parts, graphene oxide 0.05-0.8 parts, MXene 0.05-1 parts, aerogel powder 0.2-2 parts, silane coupling agent 0.05-0.8 parts, hydrophobic modified nanoparticles 0.1-1 parts, polyvinyl alcohol 0.2-1.5 parts, polyacrylamide 0.2-1.5 parts, polycarboxylate superplasticizer 0.2-1.2 parts, the present application is mixed into shear thickening fluid and charge control layer mineral, so that wet-spraying concrete has pumpability and sprayability, low viscosity ensures smooth pumping when conveying, viscosity rises sharply under impact of jetting, greatly reduces resilience and material waste, layered double hydroxide forms electrostatic adsorption to improve adhesion stability, limit initial crack width at the same time, improve the quality of sprayed concrete structure.

This invention discloses a highly uniform copper-based alloy powder for metal additive manufacturing and its production process, belonging to the field of alloy powder technology. First, zirconium oxychloride octahydrate, yttrium nitrate hexahydrate, and terephthalic acid are used as raw materials to obtain Zr-Y-MOF powder via solvothermal synthesis. Then, this powder is composited with nano-silicon carbide and pyrolyzed to obtain zirconium yttrium oxide-silicon carbide composite powder. Copper-coated composite refining agent is obtained through chemical copper plating. Finally, a double-crucible vacuum induction gas atomization process is used to in-situ alloy Cu-Cr and Cu-Nb master alloys, which are then instantaneously mixed and atomized with the composite agent to obtain highly uniform copper-based alloy powder. This invention solves the problems of high oxygen content, component segregation, and coarse grains in traditional copper-based additive manufacturing powders through the synergistic effect of double-crucible in-situ alloying and copper-coated composite refining agent. The resulting powder has uniform particle size, low oxygen content, and dense structure, making it suitable for the preparation of general copper alloy components in the field of metal additive manufacturing.

The utility model discloses a kind of tensile tear-resistant reinforced CPVC cable protection pipe, it includes pipeline, the inside fixed connection of pipeline has CPVC resin, the inside fixed connection of CPVC resin has nano calcium carbonate, the inside fixed connection of nano calcium carbonate has calcium-zinc stabilizer.Through the above structure, there is a layer of CPVC resin in pipeline, the smooth surface of CPVC resin can reduce the contact area of cable and pipe wall, reduce the local temperature rise caused by heat generation due to friction, while the air gap between pipe wall and cable is more uniform, beneficial to the heat dissipation of cable operation, prolong the service life of cable, there is also a layer of nano calcium carbonate in it, nano calcium carbonate particle size is usually 10~100nm, specific surface area is large and dispersibility is good, uniformly filled in CPVC resin matrix can form "rigid particle reinforcing effect", the tensile strength of inner wall layer is improved by 20%~30%, and bending modulus is improved by 15%~25%.

This invention discloses a method for preparing cubic nano-calcium carbonate based on monosaccharide regulation. Using monosaccharides as crystal guiding agents, the resulting cubic nano-calcium carbonate exhibits a cubic structure with an average particle size of 81-115 nm. The monosaccharide is either glucose or fructose. The preparation method includes the following steps: 1. Preparation of calcium oxide; 2. Preparation of monosaccharide-nano-calcium carbonate. The amount of monosaccharide added is 0.8-1.2 wt.% of the calcium oxide mass; the calcium oxide yield is 65-75%. The resulting nano-calcium carbonate has a whiteness value of 90.6-97.3 wb and an oil absorption value of 65.3-89.6 g DOP / 100 g CaCO3.

The utility model relates to nanometer calcium carbonate technical field discloses a dehydration device for processing nanometer calcium carbonate, including the bottom plate, the top right side middle part of bottom plate is fixedly connected with the air draught fan, the top front end right side of bottom plate is fixedly connected with the spray tower, the inner wall bottom of spray tower is fixedly connected with the diffuser pipe, the rear end of diffuser pipe and spray tower is fixedly connected with the second pipeline and penetrates, the top middle part of spray tower is fixedly connected with the third pipeline and penetrates and rotates, the bottom of third pipeline is provided with the atomizing nozzle that distributes evenly, the top of outer ring of third pipeline rotates and is connected with the liquid medicine bucket, in the utility model, open the air draught fan, send the waste gas into the diffuser pipe, through the hole on the surface can quickly spread to the whole spray tower, the first brake motor drives the second bevel gear to rotate, can drive the first bevel gear, third pipeline and atomizing nozzle rotate, atomizing nozzle releases liquid medicine, can quickly purify waste gas.

The present application relates to a DNA drug, a gene targeting delivery system and its application in the treatment of lower extremity peripheral arterial disease. Specifically, the present application relates to a microcrystalline nanocarbon targeted drug delivery system and a plasmid containing human interleukin-4 gene loaded thereon. The delivery system comprises a matrix microcrystalline nanocarbon, and folate, polyethyleneimine and polyethylene glycol modified on the surface thereof. The matrix microcrystalline nanocarbon has a size of 5-20 nanometers, a crystallinity of >80%, a rich mesoporous structure, a high specific surface area and good biocompatibility. The present application also provides a preparation method of the system, which comprises the steps of synthesizing a matrix by pulse modulation radio frequency plasma enhanced chemical vapor deposition, surface functionalization modification and plasmid loading. After injection into the lower extremity muscle, the system can actively target the macrophages in the ischemic site, realize long-term expression of the IL-4 gene at the lesion site. It can effectively promote stable, mature functional angiogenesis by inducing macrophages to polarize to the repair M2 phenotype and regulating the OSM / GSNOR / ENG signal axis, thereby improving limb ischemia. The present application has important application value in the field of gene therapy for ischemic diseases, especially peripheral arterial disease and severe limb ischemia.

This utility model relates to the field of nano-calcium carbonate drying technology and discloses a dryer for the preparation of nano-calcium carbonate. The dryer includes a drying tank with a feed inlet at the top. A stirring and vibration device is fixedly connected to the outer wall of the top of the drying tank. A sliding hole is provided at the top of the drying tank, and an intermittent injection device is slidably connected to the hole. An inner tank is fixedly connected to the outer wall of the stirring and vibration device, and a heating coil is fixedly connected to the outer wall of the inner tank. When the motor starts, the drive shaft and bushing rotate, driving the stirring rod to stir. At the same time, the scraper rotates to scrape off the calcium carbonate adhering to the inner wall of the inner tank. When the scraper presses against the semi-circular protrusion, it compresses the return spring. When the scraper leaves, the return spring returns to its original position. The semi-circular protrusion has multiple sets, which continuously squeeze to complete the stirring and vibration at the same time, which not only makes the stirring more uniform but also improves the drying efficiency.

This invention discloses a method for preparing high-density cobalt-free nano-tungsten carbide cemented carbide, belonging to the field of cemented carbide technology. The preparation method includes the following steps: aluminum powder, copper powder, manganese powder, molybdenum powder, and titanium powder are mixed and then subjected to a first ball milling process to obtain high-entropy alloy powder; nano-tungsten carbide powder, high-entropy alloy powder, tantalum carbide powder, vanadium carbide powder, carbon nanotubes, lanthanum oxide, and yttrium oxide are mixed and then subjected to a second ball milling process to obtain composite powder; paraffin wax, stearic acid, ethylene-vinyl acetate copolymer, and low-density polyethylene are mixed to obtain a binder; the composite powder and binder are kneaded to obtain a compound; the compound is extruded to obtain a green body; the green body is subsequently subjected to solvent degreasing and hot degreasing treatments to obtain a degreased green body; the degreased green body is rapidly hot-pressed and sintered to obtain the high-density cobalt-free nano-tungsten carbide cemented carbide. Through the above scheme, this invention prepares a high-density cobalt-free nano-tungsten carbide cemented carbide with good density, hardness, and oxidation resistance.

This invention belongs to the field of catalytic materials technology, and relates to a hollow nanosphere material, its preparation method, and its applications, particularly an amorphous composite metal oxide hollow nanosphere material, its preparation method, and its application in the catalytic cracking of low-carbon hydrocarbons to prepare nano-carbon materials. The amorphous composite metal oxide hollow nanosphere material prepared by this invention exhibits extremely high catalytic activity and nano-carbon material yield in the process of catalytic cracking of low-carbon hydrocarbons to synthesize nano-carbon materials. The hollow nanosphere structure increases the contact area between reactant molecules and the catalyst, reduces the transport distance of reactant molecules to the active center, and the unique internal cavity provides ample space for the growth of nano-carbon materials, avoiding the blockage of the catalyst's internal channels by the synthesized nano-carbon materials, thus preventing the isolation of reactant molecules from the active center.

This invention belongs to the field of polymer sealing materials technology, specifically relating to a modified PTFE sealing material, its preparation method, and its application. The modified PTFE sealing material provided by this invention comprises the following components: polytetrafluoroethylene resin, bronze powder, nano-carbon materials, polyimide micropowder, potassium titanate whiskers, graphite, coupling agent, and lubricant. The modified PTFE sealing material provided by this invention exhibits high wear resistance, extremely low wear rate, excellent creep resistance, good self-lubrication, and thermal conductivity, enabling it to maintain excellent performance under various operating conditions (high-speed, high-temperature, and extreme-pressure conditions), thus extending the service life of the sealing components.

This invention discloses a novel method for preparing plastic liners for hydrogen storage cylinders, belonging to the technical field of plastic liner preparation for hydrogen storage cylinders. First, a long-chain vinylimidazolium bromide intermediate is prepared through a nucleophilic substitution reaction of N-vinylimidazolium and bromododecane. Then, anion exchange is performed with lithium bis(trifluoromethanesulfonylimide) to synthesize an alkylvinylimidazolium ionic liquid. This ionic liquid is used to modify the surface of nano-calcium carbonate to introduce reactive sites, and synergistically construct an inorganic reinforcement system with silane-modified fumed silica. Next, inorganic fillers are melt-blended with high-density polyethylene and elastomers to form a composite powder. Finally, a crosslinking agent is added, and the mixture is molded using a rotational molding process of "low-temperature melt spreading and high-temperature in-situ crosslinking." By constructing an organic-inorganic crosslinking network, the liner is endowed with excellent dimensional stability, low-temperature toughness, and fatigue reliability under wide-temperature service conditions.

The application discloses a preparation method of modified dolomite powder and belongs to the technical field of dolomite modification treatment. The modified dolomite powder is prepared from the following raw materials in weight: 70-90 parts of dolomite powder, 1-5 parts of white hydrogen bentonite powder, 10-30 parts of nano-carbonate and a dispersing agent, wherein the weight of the dispersing agent is 0.1-0.3 percent of the weight of the nano-carbonate. The preparation method of the modified dolomite powder provided by the application can make the weak-acid dolomite powder dispersion liquid and the weak-alkali nano-carbonate dispersion liquid mix, and then make the dolomite powder particles and the nano-carbonate particles assemble and agglomerate through electrostatic mutual attraction, thereby improving the loading capacity and loading area of the nano-carbonate particles on the surface of the dolomite powder particles, and making the nano-carbonate particles uniformly and stably coated on the surface of the dolomite powder particles to form composite particles.