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Method for producing silicon carbide ceramic fibers combining sol-gel and dry spinning
ActiveCN117888234Blow costShort manufacturing cycleArtificial thread manufacturing machinesInorganic material artificial filamentsCarbide siliconFiber
The application discloses a method for preparing silicon carbide ceramic fibers by combining sol-gel and dry spinning. The method comprises the following steps: 1) after preparing a second silicon-based sol, a spinning aid is added to prepare a spinnable silicon-based sol; 2) the spinnable silicon-based sol is prepared into fiber filaments by using a dry spinning process; 3) the fiber filaments are cracked into silicon-carbon-oxygen fibers; and 4) the silicon-carbon-oxygen fibers are sintered into silicon carbide ceramic fibers. The method is different from a mainstream polycarbosilane precursor method for preparing silicon carbide ceramic fibers, does not need a non-melting treatment process, has the advantages of adjustable composition, low raw material cost and simple process and the like, and has important significance for low-cost preparation of silicon carbide ceramic fibers.
Owner:ZHEJIANG SCI-TECH UNIV
A split seal pipe coupling
ActiveCN224622440UReduce transportation problemsNot affected by inner wall diameter
This utility model relates to the field of oil transportation technology, and in particular to a detachable sealed piping connector, comprising a first pipe body and a second pipe body. A first mounting plate and a second mounting plate are respectively fixedly connected to the outer walls of the first and second pipe bodies, and the first and second mounting plates are connected by bolts and threads. The first and second pipe bodies are provided with insertion mechanisms, and the outer walls of both the first and second pipe bodies are sealed to a first sealing gasket. This detachable sealed piping connector, through the cooperation of the insertion mechanism and the first and second mounting plates, enables the installation of the first and second pipe bodies. Because the insertion holes and inserts on the insertion mechanism are machined on the outer walls of the first and second pipe bodies, the inner wall diameter is not affected during the fit, ensuring consistent inner wall diameter and reducing problems caused by diameter discrepancies during oil transportation.
Owner:DAQING BAOHE PETROLEUM TECH CO LTD
A heating wire, its preparation method and application
ActiveCN117403435BNot easily oxidizedUniform diameter
This invention belongs to the field of nanomaterials technology, specifically relating to a heating wire, its preparation method, and its application. The method for preparing the heating wire provided by this invention involves impregnating filamentous carbon nanotube fibers in a graphene-containing resin dispersion and then curing it. The resin layer containing graphene material encapsulates the filamentous carbon nanotube fibers. The filamentous carbon nanotube fibers prepared by this invention exhibit stable heating. When used in the heating system of a gas element analyzer, the heating wire exhibits low electromagnetic radiation and minimal interference with the hardware, making it more suitable for high-precision testing. The filamentous carbon nanotube fibers prepared by this invention have the advantages of stable heating and resistance to oxidation. The resin layer encapsulating the filamentous carbon nanotube fibers protects the carbon nanotubes, isolates them from air, and extends the service life of the heating element's carbon nanotubes.
Owner:JIANG SU ZHEN XI KE JI YOU XIAN GONG SI
Compact winding pipe heat exchanger
ActiveCN224246820Ushorten the lengthEasy to assembleStationary tubular conduit assembliesHeat exchanger casingsInterior spacePhysics
A compact type winding pipe heat exchanger comprises a shell pass cylinder, a winding pipe, a winding pipe and a winding pipe, the two tube plates are respectively arranged at the upper end and the lower end of the shell pass cylinder; the central cylinder is vertically arranged in the shell pass cylinder; the heat exchange tubes are arranged in the shell pass barrel, and the two ends of each heat exchange tube are supported on the corresponding tube plates respectively; the two tube boxes are provided with tube pass connecting tubes and are respectively arranged on the corresponding tube plates; the lower portion of the center cylinder is hollow to form a first channel with the bottom open, and a first through hole is formed in the side wall of the first channel so as to communicate the first channel with the inner space of the shell pass cylinder. The upper part of the central cylinder is hollow to form a second channel with an open top; a second through hole is formed in the side wall of the second channel; meanwhile, shell pass connecting pipes are arranged on the two pipe boxes, and the shell pass connecting pipes are communicated with the bottom opening of the corresponding first channel and the top opening of the corresponding second channel through connecting pipes of the shell pass connecting pipes. The axial length of the heat exchanger is reduced while the heat exchange effect is guaranteed.
Owner:ZHENHAI PETROCHEMICAL JIANAN ENGINEERING CO LTD
Method for manufacturing prestressed ultrahigh-strength steel strand
Owner:天津腾海科技发展有限公司
A static electrospinning embedded guava peel flavonoids sustained-release composite fiber membrane and a preparation method thereof
A slow-release composite fiber membrane for encapsulating passion fruit peel flavonoids by electrospinning and its preparation method are disclosed. The composite fiber membrane is prepared by coaxial electrospinning and consists of a core layer and a shell layer. The core layer is a carrier solution containing passion fruit peel flavonoids, and the shell layer is a biodegradable polymer solution. The composite fiber membrane has an encapsulation rate of ≥85% for passion fruit peel flavonoids and possesses antioxidant and slow-release properties. Chitosan, gelatin, zein, and β-cyclodextrin are used as spinning wall materials, and passion fruit peel flavonoids extracted by DES method are used as the functional core material. Efficient encapsulation, controlled release, and stabilization of flavonoids are achieved through coaxial electrospinning. This invention solves the problems of easy oxidation, photothermal instability, poor water solubility, and low bioavailability of flavonoids.
Owner:GUANGDONG UNIV OF PETROCHEMICAL TECH
In-situ growth of mog carbon nanofiber catalyst, preparation method and application thereof
The application discloses an in-situ growth MOG carbon nanofiber catalyst and a preparation method and application thereof, and comprises the following steps: stirring and mixing a nanofiber polymer and a solvent to obtain a uniform spinning liquid; performing electrostatic spinning to obtain a nanofiber membrane; adding a metal salt, a nitrogen-containing compound and resorcinol into water, slowly adding formaldehyde into the mixed solution to obtain an in-situ growth solution of a metal organic gel MOG; placing the nanofiber membrane into the in-situ growth solution to adjust a pH value, and performing in-situ growth by heating to obtain a MOG nanofiber membrane material; and performing high-temperature pyrolysis of the MOG nanofiber membrane material and urea in an inert atmosphere to dope nitrogen, thereby obtaining the MOG-CNF catalyst. The catalyst can effectively reduce overpotential of ORR and OER reactions, improve catalytic stability, and present stable and excellent dual-function electrocatalytic performance. Through a nano structure and a synergistic catalytic effect, the catalyst has a wide application prospect in the field of fuel cell energy storage and conversion.
Owner:XINYU UNIV
Chenille yarn low-damage winding machine
ActiveCN224172205Uavoid entanglementguaranteed qualityFilament handlingWinding machineElectric machine
The utility model discloses a chenille yarn low-damage winding machine, which relates to the technical field of spooling and comprises a winding mechanism, the winding mechanism comprises a mounting table, one side of the top of the mounting table is fixedly connected with a guide roller, and the other side of the top of the mounting table is provided with an electrostatic eliminating roller. In the winding mechanism, the static electricity eliminating roller is matched with the static electricity eliminating grounding wire, yarn static electricity can be rapidly eliminated, the situation that impurities are adsorbed by the static electricity, yarn winding is caused is avoided, and the yarn quality is guaranteed; the guide mechanism drives the threaded rod through the first motor, so that the driving block stably slides along the guide rod; in the tension degree self-adaptive mechanism, a spring, a sliding block and a tension adjusting rod sense and adjust the tension of the yarn in real time, so that the tension degree self-adaptive mechanism adapts to the characteristics of the chenille yarn, the problem of breakage or looseness caused by abnormal tension is solved, and finally the yarn spooling quality and the production efficiency are improved.
Owner:ANHUI XINGE NEW MATERIALS TEXTILE CO LTD
Anti-tumor degradable ureteral stent with bionic structure and preparation method of anti-tumor degradable ureteral stent
PendingCN121944255AWide range of degradation controllabilityMeet the needs of different clinical treatment cyclesStentsSurgeryDrug release ratePolyester
The invention belongs to the technical field of medical stents, and particularly relates to an anti-tumor degradable ureteral stent with a bionic structure and a preparation method of the anti-tumor degradable ureteral stent. The anti-tumor degradable ureteral stent with the bionic structure comprises a single-layer tubular stent body or a multi-layer tubular stent body, the single-layer tubular stent body is made of aliphatic polyester polymers and drugs, the multi-layer tubular stent body comprises an inner tube and an outer tube which are coaxial, the inner tube is made of polyvinyl alcohol and drugs, and the outer tube is made of polyethylene glycol. And the outer pipe is made of an aliphatic polyester polymer. The anti-tumor degradable ureteral stent with the bionic structure provided by the invention has flexibility required for adapting to dynamic peristalsis of the ureter, is not easy to cause mechanical damage to urinary tract tissues, has dual functions of anti-tumor activity and surface wettability, can realize synchronous matching of a drug release rate and a material degradation rate, and has a good application prospect. Meanwhile, the mechanical anti-fatigue performance of the stent is not sacrificed.
Owner:TAIYUAN UNIVERSITY OF TECHNOLOGY
Annular non-contact quartz fiber production heating and melting device
ActiveCN224186045Uhigh purityavoid pollutionGlass furnace apparatusElectric furnaceThermodynamicsMechanical engineering
The utility model relates to the field of quartz fiber production, and discloses an annular non-contact quartz fiber production heating and melting device which comprises an outer cavity, an outer cavity cover is fixedly connected to the top of the outer cavity, a plurality of guide rod holes are formed in the surface of the outer cavity cover, an inner cavity is fixedly connected to the interior of the outer cavity, and a plurality of guide rod holes are formed in the surface of the inner cavity. An inner cavity cover is fixedly connected to the top of the inner cavity, a heating assembly is arranged in the inner cavity and comprises a heating ring, the heating ring is installed in the inner cavity, a plurality of heat insulation pipes are fixedly connected to the bottom of the heating ring, a plurality of heating holes are formed in the top of the heating ring, and the heat insulation pipes are fixedly connected to the bottom of the heating ring. The outer wall of the heating ring is sleeved with an induction heating coil. According to the utility model, non-contact induction heating is adopted, and inert gas is filled into the inner cavity to protect molten quartz glass rod liquid drops, so that impurities in the air can be prevented from polluting the quartz liquid drops, and the purity of silicon dioxide in the quartz fiber is further improved.
Owner:HEBEI HEFENG TECH DEV CO LTD
A bio-based nanofiber membrane, a preparation method thereof and application thereof in ethylene adsorption and fruit preservation
ActiveCN118087147BRich in sources, safe and non-toxicImprove adsorption capacityFruit and vegetables preservationConjugated cellulose/protein artificial filamentsPullulanClimacteric
The application discloses a kind of bio-based nanofiber membrane and its preparation method and application in ethylene adsorption and fruit preservation;The application is by dispersing oxidized starch and pullulan in water, and is configured into the mixed solution of oxidized starch / pullulan with solute mass fraction of 15~30%, and starch-polyose compound paste solution is obtained by gelatinization;Add water-soluble protein, heat and stir to obtain electrospinning liquid;The electrospinning liquid is electrospun to obtain bio-based nanofiber membrane.The bio-based nanofiber membrane prepared by the application can adsorb ethylene gas in the environment under normal temperature and pressure as a green material, and has low cost, simple process and can be reused.The nanofiber membrane system prepared by selecting oxidized starch-pullulan-water-soluble protein can adsorb 3.19-15.40cm 3 / g ethylene gas under normal temperature and pressure, prolongs the shelf life of food, and comprehensively realizes the preservation of banana and other respiratory-peak fruits.
Owner:SOUTH CHINA UNIV OF TECH
A welding workbench for automotive turbochargers based on standardized processing
ActiveCN121892827BPrecise dockingavoid runoutWelding/cutting auxillary devicesAuxillary welding devicesImpellerTurbine wheel
This invention discloses a welding workbench for automotive turbochargers based on standardized processing, belonging to the field of turbocharger welding technology. It includes a base, on which a rotary chuck is slidably mounted. A pneumatic chuck is mounted on the side of the base away from the rotary chuck via a bracket. A first electro-hydraulic rod, connected at one end to the rotary chuck, is mounted on the side of the base away from the pneumatic chuck. Through the design of the base, chuck, auxiliary unit, and positioning unit, the invention precisely solves the technical pain points of traditional workbench use, such as cumbersome processing of extruded plastic metal and unstable clamping. The corresponding arrangement of the rotary chuck and pneumatic chuck achieves precise docking of the turbine shaft and turbine impeller. In conjunction with the second electro-hydraulic rod of the positioning unit, the upper pressure seat, the lower clamping seat, and the transmission engagement of the gear and rack, the turbine impeller, fixed by the pneumatic chuck, can be clamped in a wrap-around manner, effectively preventing radial runout of the impeller during high-speed rotational friction.
Owner:FENGCHENG PACIFIC SHENLONG TURBOCHARGER CO LTD
Thorium polymer spun fiber precursor, thorium oxide nanofiber and preparation method and application
This invention discloses a thorium polymer spinning precursor, thorium oxide nanofibers, their preparation methods, and applications, belonging to the field of nuclear materials technology. The invention uses thorium chloride as the thorium source, acetylacetone as the ligand, and triethylamine as the dechlorination agent to prepare a thorium polymer spinning precursor. A spinning solution is prepared using the thorium polymer as the spinning precursor, methanol as the solvent, and polyethylene oxide (PEO) as the spinning aid. The thorium polymer spinning precursor fibers are obtained by electrospinning, and the precursor fibers are then heat-treated to obtain thorium oxide nanofibers. The thorium polymer spinning precursor prepared by this invention has a high thorium content and stable properties. Its spinning solution exhibits good filamentation properties, and the prepared thorium oxide fibers have uniform diameter, dense structure, and excellent flexibility. This thorium oxide nanofiber material can be used as a neutron shielding material, a breeder fuel for nuclear technology, and also as a high-temperature resistant material for preparing special ceramics.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Nodular cast iron jacking pipe with multi-layer composite structure
PendingCN121953140AUniform diameteravoid crackingPipe laying and repairAnti-corrosive paintsDuctile ironPipe
The nodular cast iron jacking pipe with the multi-layer composite structure comprises a pipe body, a concrete layer and a protective layer are sequentially arranged on the outer wall of the pipe body from inside to outside, and the protective layer is a continuous compact layer formed through a winding process. The nodular cast iron jacking pipe is high in strength, good in impact resistance and environmental adaptability, capable of effectively resisting various stresses in transportation, construction and extreme use environments and capable of preventing the cracking phenomenon.
Owner:XINXING DUCTILE IRON PIPES CO LTD +1