126 results about "Plasma technology" patented technology

The invention relates to the technical field of rare earth metal electrolysis cathode protection coatings, in particular to a high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating on the surface of a tungsten cathode. A metallurgically bonded strong bonding bottom layer is constructed on a tungsten substrate through surface pretreatment and reactive sintering, then an atmosphere plasma technology is adopted to spray a creep-resistant gradient layer with continuous components to buffer thermal stress, and finally a sol-gel technology is utilized to construct an extremely compact corrosion-resistant surface layer in a superposition mode. The high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating is constructed through a multi-scale and multi-mechanism synergistic effect, the problems that a tungsten cathode coating is insufficient in binding force and poor in thermal shock resistance are fundamentally solved, molten salt permeation can be blocked, and the service life of a tungsten cathode in a severe environment is remarkably prolonged.

The invention discloses a silicon-carbon composite negative electrode material and a preparation method and application thereof, the silicon-carbon composite negative electrode material comprises porous carbon and silicon particles attached to the porous carbon, and an attachment method between the porous carbon and the silicon particles comprises chemical bond attachment. The lithium battery prepared from the silicon-carbon composite negative electrode material disclosed by the invention has excellent first effect, specific capacity and cycle capacity retention rate. And the preparation method of the silicon-carbon composite negative electrode material has the characteristics of one-step double effects, greenness and high efficiency. Besides, the plasma technology is utilized to excite the medium gas, the two key steps of pore forming and functionalization are completed in one step through the synergistic effect of different medium gases, compared with a traditional chemical activation method, use of strong acid and strong base and the tedious cleaning process are avoided, no waste water is discharged, and the method is more environmentally friendly and saves more energy.

The invention discloses a plasma generator and a traditional Chinese medicine disinsection device thereof, and belongs to the technical field of plasma. The plasma generator comprises a base, a first electrode, a second electrode and a heat preservation pipe. The core of the device is that high-concentration mixed gas is ionized into plasma'kindling 'through discharge of the central electrode and the tubular electrode, and the'kindling' ignites extremely rarefied mixed gas, so that stable and low-consumption combustion is realized. The disinsection device integrates the generator, an air path system and a transmission and air injection device, and the high-temperature air flow generated by the generator is used for carrying out double-sided uniform injection on the medicinal materials subjected to transmission and turn-over treatment, so that worm eggs are effectively killed at instantaneous high temperature, and no medicine residues exist. The device has the advantages of high efficiency, safety and energy conservation.

This invention relates to a pre-fabricated tritium target based on a polycrystalline film and its manufacturing method, belonging to the field of plasma technology. The pre-fabricated tritium target includes an oxygen-free copper target substrate, a first zirconium film, a high-entropy ceramic tritium-blocking layer, and a second zirconium film sequentially deposited on its surface. The manufacturing method includes: pre-treating the oxygen-free copper target substrate; sequentially depositing multiple layers of films using a magnetron sputtering process to form a polycrystalline film layer; purging the oxygen-free copper target substrate with the polycrystalline film layer with tritium; and bonding the oxygen-free copper target substrate to an oxygen-free copper target holder. The pre-fabricated tritium target based on a polycrystalline film of this invention solves the problem of balancing heat dissipation and tritium blocking performance in traditional processes, achieving a balance between heat dissipation and tritium blocking capabilities. This allows the prepared pre-fabricated tritium target to be reused, improving the utilization rate of the pre-fabricated tritium target and reducing the cost of using neutron tubes.

The invention relates to the technical field of plasma, in particular to a plasma cleaning device capable of being spliced. The plasma generator comprises a main cavity, side plates, an electrode assembly and a high-voltage electric connector, the side plates are connected to the two sides of the main cavity in a sealed mode, the main cavity is formed by splicing a plurality of cavity modules, each cavity module is provided with a discharge area, an exhaust area, a plasma air outlet, an exhaust inlet and a splicing installation position, the discharge areas of the multiple cavity modules are communicated, and the exhaust areas of the multiple cavity modules are communicated with the splicing installation position. The exhaust areas of the plurality of cavity modules are communicated, the discharge areas are isolated from the exhaust areas, the plasma gas outlets are communicated with the discharge areas, the exhaust inlets are communicated with the exhaust areas, an electrode assembly is installed in the discharge area of each cavity module, and the high-voltage electric connectors are connected with the electrode assemblies. And the side plates and the cavity modules are positioned, butted and fixed through the splicing mounting positions. The cleaning heads with different lengths are composed of a modular product and can be spliced and customized according to customer requirements, and the overall transformation cost and the manufacturing cost can be reduced.

The invention provides an anti-ion sputtering sealing structure, which relates to the field of plasma technology application and comprises a metal cover plate, a vacuum cavity, a sealing ring and a ceramic ring. And three grooves are formed in the metal cover plate and are respectively used for placing and limiting the sealing ring, the ceramic ring and the vacuum cavity. The sealing ring is used for connecting the metal cover plate and the vacuum cavity in a sealed mode, the ceramic ring is placed between the plasma and the sealing ring, and the energy of the plasma reaching the sealing ring is effectively attenuated by increasing the refraction path of the plasma at the connecting gap. According to the invention, the ablation risk of the plasma to the sealing ring is reduced, and plasma pollution and vacuum rupture caused by damage of the sealing ring are prevented, so that the long-term stable operation of the ion source system is ensured.

This invention discloses a portable low-temperature plasma device based on a Laval nozzle structure and its application, belonging to the field of plasma technology application technology. Specifically, it includes (1) the construction of the device; and (2) the use of the device for fungal eradication treatment and transdermal drug delivery enhancement treatment. The beneficial effects achieved by this invention are as follows: This invention is the first to apply the Laval nozzle structure to a portable low-temperature plasma device. The results show that the device can effectively improve the plasma jet performance and active particle content, significantly improve the treatment effect of fungal infections of the skin and nails and the transdermal drug penetration efficiency, while solving the problems of large size, reliance on external power supply, and complex operation of traditional plasma devices. Therefore, using this invention for the treatment of fungal infections of the skin and nails and for enhanced transdermal drug delivery has advantages such as ease of operation, high safety, non-invasiveness, and high efficiency, and thus has potential application prospects in the field of skin disease treatment and transdermal drug delivery.

The invention discloses a medical-grade ultralow-adsorption cycloolefin copolymer (COC) material and a preparation method thereof. According to the material, COC serves as matrix resin, surface-modified nano silicon dioxide is loaded through in-situ polymerization, and a perfluoroalkyl siloxane (PFAS) coating is grafted on the surface of the material through a normal-pressure plasma technology. The preparation method comprises the following steps: surface modification of nano-SiO2, in-situ polymerization of COC, loading of nano-SiO2, and continuous grafting of PFAS with normal-pressure plasma. The adsorption rate of the material is as low as 3.2 * 10 <-7 > copy / mu L (annual loss rate); the temperature from-196 DEG C (liquid nitrogen) to 121 DEG C (autoclaved sterilization) can bear 16,000 g centrifugation without rupture; by means of ethylene oxide sterilization or gamma ray irradiation, it is ensured that the product is free of endotoxin (1t, 0.001 EU / mL), free of DNA enzyme / RNA enzyme residues and other excellent performance, the problems of high adsorption rate and low-temperature brittleness of a traditional COC material in biological sample storage are effectively solved, and the method is suitable for large-scale production of high-end medical cryopreservation tubes and other products.

The useful solution describes a process for breaking the dormancy of Vietnamese ginseng (Panax vietnamensis) seeds using plasma technology, which includes the following steps: a) seed collection and preliminary processing; b) treatment with plasma-activated water (PAW); c) treatment with gaseous plasma; and d) breaking the dormancy of Vietnamese ginseng seeds. In addition, the solution also describes a process for producing Vietnamese ginseng (Panax vietnamensis) seedlings, which includes the following steps: a) seed treatment; b) sowing treated seeds into a substrate; and c) seedling care. The process described in the solution stimulates development and completes embryo structure, shortens seed dormancy, increases germination rates, and allows for proactive seedling production of Vietnamese ginseng.

This utility model relates to the field of plasma device technology, and more particularly to an atmospheric pressure microwave jet plasma device. It primarily addresses the problems of mainstream vacuum plasma cleaners, which rely on low-pressure environments, resulting in high equipment costs, complex vacuum environment setup and maintenance, and potential impacts on processing efficiency, thus hindering the widespread application of low-temperature plasma technology. The proposed technical solution includes a controller for outputting microwave signals and process gases; a nozzle module connected to the controller for generating plasma to clean objects; and a fixing plate fixedly connected to the side of the nozzle module, on which a mounting bracket is installed for fixing the nozzle module to the production line frame. This utility model can operate at atmospheric pressure, avoiding the problems associated with vacuum environments, thus reducing costs and operational difficulty, while ensuring stable and efficient operation, facilitating the widespread application of plasma technology.

The application discloses a portable sterile water preparation device using a plasma technology and belongs to the technical field of sterile water preparation. The device comprises a shell, a splash-proof baffle, an end cover, a flow guide device, a sealing cap, a flexible material and a porous medium. The flexible material generates plasma through discharge to fill the closed shell. The porous medium has water absorption and can absorb a liquid to be treated. The plasma diffuses into the porous medium and performs sterilization treatment on the liquid to be treated. The sterile water is prepared through an indirect treatment mode. The device has the advantages of portability, simple operation and safety in the sterile water preparation process.

The invention discloses a surface dielectric barrier discharge exciter working mode on-line diagnosis device based on electroacoustic signal coupling characteristics, and belongs to the cross technical field of plasma technology and electrical equipment state monitoring. Voltage and current waveforms and excitation acoustic signals in the discharge process are synchronously collected, and associated characteristics of the voltage and current waveforms and excitation acoustic signals in a time domain, a frequency domain and an energy coupling layer are extracted, so that non-optical and real-time on-line judgment of filamentous discharge, dispersion discharge and a transition state in a typical working mode of surface dielectric barrier discharge is realized. The device does not need high-speed imaging equipment, is suitable for exciter state monitoring and closed-loop regulation and control in severe environments such as flow control, and has the advantages of simple structure, quick response, high environmental adaptability and the like.

The invention discloses a production process and equipment for a non-woven fabric and fiberboard composite product, and belongs to the field of production of non-woven fabric and fiberboard composite products. Fiberboard pretreatment: activating the surface of the fiberboard by adopting a low-temperature plasma technology, and introducing a polar group to the surface of the fiberboard to enhance the surface energy of the fiberboard; and then nano-scale roughening treatment is conducted, a micro nano concave-convex structure is formed on the surface of the fiberboard through the laser engraving technology, and the specific surface area of the surface is increased. According to the method, the process improvement of combining the low-temperature plasma technology and the nanoscale roughening treatment is adopted in the fiberboard pretreatment stage, multiple polar groups are successfully introduced to the surface of the fiberboard, the surface energy of the fiberboard is increased to 65 mN / m from 35 mN / m, meanwhile, a microcosmic nanometer concave-convex structure is engraved by means of laser engraving equipment, the specific surface area of the surface is increased by 60%, and the specific surface area of the surface is increased by 60%. And the binding force between the fiberboard and the non-woven fabric is greatly enhanced.

The invention discloses a polysaccharide aldehyde modification method based on a plasma technology, relates to the technical field of biological material modification, and aims to solve the problems of environmental pollution, harsh reaction conditions and complex product purification in the conventional chemical oxidation method. Comprising the following steps: S1, preparing a polysaccharide solution; dissolving polysaccharide in a solvent, and stirring until the polysaccharide is completely dissolved to obtain a homogeneous polysaccharide solution; and S2, plasma in-situ oxidation treatment. In an inert gas atmosphere environment, plasma is generated by using a coaxial dielectric barrier discharge device, and active substances of the plasma directly act on a polysaccharide solution, so that an aldehyde group is introduced to a polysaccharide molecular chain, and an aldehyde polysaccharide solution is obtained. And S3, freeze-drying and forming. And freeze-drying the obtained aldehyde polysaccharide solution to obtain the aldehyde polysaccharide solid material with the three-dimensional porous network structure. The method is simple and convenient to operate, easy to popularize, simple in equipment, short in process, free of complex purification steps and beneficial to laboratory and large-scale production and application.

The application discloses a preparation method of an antioxidant lead-free tin-based solder alloy for high temperature, and belongs to the technical field of solder alloy production processes. When the solder alloy is prepared by the method, elements in raw materials include the following in percentage by mass: 88-95% of Sn, 1-4% of Ag, 0.5-3% of Bi, 0.1-1% of Y, 0.05-0.2% of Hf, and the balance is inevitable impurities. The preparation method of the solder alloy is as follows: after metal raw materials are pickled and dried, Sn is first smelted and kept warm under inert gas protection, then Ag and Bi are added, stirring and heating, Y and Hf are further added and ultrasonic smelting is conducted; after a deoxidizing agent is added and reacts, the solder alloy is placed and slag is removed; three-stage refining is conducted through plasma atomization, high-low frequency ultrasonic treatment and a pulse ultrasonic conversion system; finally, the solder alloy is cooled, sieved and annealed to obtain the solder alloy. The application combines plasma technology, gas atomization and ultrasonic technology, realizes preparation of a tin-based solder alloy with uniform composition, high oxidation resistance and excellent mechanical properties, and meets the needs of the electronic welding field under high temperature environment.

The invention provides a preparation method of tetrafluoroethylene and / or hexafluoropropylene, and relates to the technical field of resource utilization. The invention provides a tetrafluoroethylene and / or hexafluoropropylene preparation method, which comprises: introducing a fluorine-containing greenhouse gas into a plasma reactor provided with a stepping graphite cathode, and carrying out a cracking-recombination reaction to obtain tetrafluoroethylene and / or hexafluoropropylene, the molar ratio of fluorine to carbon in the fluorine-containing greenhouse gas is greater than or equal to 2; the temperature of the plasma reactor is greater than or equal to 1500K. According to the method, a plasma technology is adopted, a stepping graphite cathode is used as a supplementary carbon source, chemical bonds in fluorine-containing greenhouse gas molecules are broken and recombined, and tetrafluoroethylene and / or hexafluoropropylene are / is generated. The preparation method provided by the invention is high in raw material conversion rate, high in selectivity of tetrafluoroethylene and / or hexafluoropropylene and high in yield; and the preparation method is simple in process, simple to operate, low in energy consumption, green, environment-friendly, low in production cost and suitable for industrial production.

The invention belongs to the field of waste battery material recovery, and provides a waste battery material recovery method based on a plasma chemical vapor deposition technology. Firstly, a network compound with a metal chelating function is synthesized and forms stable combination with active sites on the surface of an electrode in subsequent coating deposition, and harmful metal ions are effectively captured; secondly, a fluorine-containing imidazolyl-quaternary ammonium salt network compound is designed, and the fluorine-containing imidazolyl-quaternary ammonium salt network compound is endowed with excellent surface passivation and chemical stability by a fluorinated group; in the stripping process, the active material and the metal current collector are separated by periodically adjusting the temperature and combining the plasma technology, the stripped active powder can be further extracted and purified through acid pickling treatment, and the metal current collector is combined with a fluorine-containing compound and an inorganic silica network deposition process. The metal surface is endowed with good corrosion resistance and reprocessing performance, the method is suitable for recycling of electrode materials in waste batteries, and meanwhile the recycling value of related materials is improved.

The invention belongs to the technical field of agricultural product processing, and discloses a sterilization method of cold dressed cucumbers, which comprises the following steps: 1) checking and accepting cucumber raw materials; 2) washing with clean water; 3) cleaning with acidic electrolyzed water; 4) washing with clean water; 5) segmenting; 6) performing low-temperature plasma sterilization; 7) adding a seasoning bag; and 8) packaging. According to the invention, a non-thermal processing technology is selected, acidic electrolyzed water is coupled with a low-temperature plasma technology, the cold-dressed cucumber is treated, and the color, fragrance, taste, nutritional ingredients and edible safety of the cold-dressed cucumber are maintained to the greatest extent. The technical process is green, pollution-free, convenient to operate and high in efficiency.

This application relates to the field of plasma technology, disclosing a plasma processing chamber and a plasma device. The plasma processing chamber includes: a chamber body comprising a vacuum chamber for performing semiconductor deposition processes; an upper electrode and a lower electrode, the upper electrode and the lower electrode being spaced apart within the vacuum chamber, with a potential difference between the upper electrode and the lower electrode to generate plasma between them; and a magnetic component disposed on the outer side and / or edge of the upper electrode, and on the outer side and / or edge of the lower electrode; wherein the magnetic component is used to form a magnetic field between the upper electrode and the lower electrode, and to uniformly confine the plasma within the magnetic field.

The invention discloses an integrated device for efficiently treating waste water through cooperation of microbubbles and plasmas, and belongs to the technical field of waste water treatment through the plasma technology.The plasma generation system comprises an electrode bar, an electrode sleeve, a quartz tube and a copper tube ground electrode, and the electrode bar is fixed through the electrode sleeve and inserted into the quartz tube with a branch gas port; the copper tube ground electrode is tightly combined with the lower portion of the quartz tube, the microbubble system comprises an outlet connector, a porous ceramic tube and a device shell, the porous ceramic tube is placed in the device shell, a water inlet and a water outlet are reserved in the left side and the right side of the device shell respectively, the circulating system comprises a water storage tank and a water pump, and the water pump is installed in the water storage tank. The industrial wastewater treatment device is easy to operate, small in size, low in cost, capable of being used independently or jointly, large in wastewater treatment capacity and capable of meeting the treatment requirement of industrial wastewater, in the wastewater treatment process, power consumption is low, chemical agents do not need to be introduced, wastewater treatment cost is reduced, and secondary pollution is avoided.

The utility model relates to the field of microwave plasma technology, more particularly to a kind of reaction cavity and MPCVD device, the reaction cavity includes antenna, the antenna is provided with dielectric plate between reaction cavity, the dielectric plate is low dielectric constant material, the dielectric plate is uniformly spaced, provide a kind of reaction cavity of electric field distribution uniformity, the MPCVD device includes the reaction cavity.

The utility model relates to a graphene preparation device. The graphene preparation device comprises a plasma chamber, a solid-state carbon source chamber and a reaction chamber which are communicated in sequence, the plasma chamber is configured to obtain a high-temperature heat source by utilizing plasma, and the solid-state carbon source chamber is configured to gasify a solid-state carbon source into a gaseous-state carbon source by utilizing a plasma technology. When the graphene preparation device is used for preparing graphene, carrier gas enters the plasma chamber and is heated to obtain high-temperature carrier gas; high-temperature carrier gas passes through a solid carbon source chamber filled with a solid carbon source, and the solid carbon source is gasified into a gaseous carbon source with adjustable components; and the gaseous carbon source and the catalyst react in the reaction chamber to generate graphene. The plasma is high in controllability of energy output, wide in temperature controllable range, capable of generating charged particles and activating the solid carbon source, and the advantages of effectively improving adjustability, stability, high activity, low cost, low risk and the like of the carbon source are achieved by combining water vapor vaporization and hydration reaction.

The present application relates to the technical field of coal mining, in particular to a coal mine intelligent collaborative mining system and method based on plasma technology. The system comprises an intelligent master control hub, a shared support module, a plasma rock breaking and tunneling device, a gas extraction and permeability improvement assembly, a non-pillar mining-high energy ion gasification assembly, and a global safety protection system. The present application builds an integrated collaborative architecture of "intelligent master control hub + shared support module + three major functional execution systems", fundamentally overcoming the fundamental defects of traditional technology and existing plasma research "single-point breakthrough, difficult to collaborate", realizing the transition from "equipment integration" to "system intelligence", and through multi-dimensional monitoring network, the physical field, gas concentration and structural stress are monitored at millisecond level, breaking through the limitations of each link of traditional coal mining, realizing a safe, efficient and green mining mode, the method is safer, more uniform and more durable, and has a wide application prospect.

This invention proposes a room-temperature and ambient-pressure microwave low-temperature plasma jet excitation device, relating to the field of plasma. It includes a resonant cavity comprising a coaxial outer cavity and an inner cavity. A copper core tube is fixedly mounted in the upper half of the inner cavity, with its top end extending beyond the top opening of the inner cavity. A gas guide hole is also provided at the bottom of the inner cavity. A gas guide port and a microwave feed port are provided on the side of the outer cavity, and an air inlet channel is also provided at the bottom of the outer cavity. This invention, by employing a double-layered open coaxial resonant cavity structure and setting specific parameter ratios, enables the efficient and stable excitation of a stable and controllable low-temperature plasma jet with extremely low power under ambient temperature and pressure conditions. It also reveals the working mechanism, solving the problems of traditional technologies such as dependence on low gas pressure, high excitation power, poor jet stability, and low microwave absorption efficiency, and broadening the application scenarios of low-temperature plasma technology.

The application discloses a method for separating and purifying germanium from complex silicon-based germanium-containing materials, and relates to the technical field of non-ferrous metallurgy and resource recovery. The method comprises the following steps: after the material is mechanically ball milled, a trace amount of oxygen is introduced into a low-temperature plasma reactor for activation; then, the material is leached with a mixed acid solution of ammonium hydrogen fluoride and hydrogen peroxide under the assistance of ultrasonic waves; multi-stage countercurrent extraction is carried out by using a functionalized imidazole ionic liquid in cooperation with a tertiary amine synergistic extractant; the product is back-extracted by using a dilute hydrochloric acid with a ladder concentration gradient and is deeply purified by dropwise adding sodium sulfide; and finally, modified polyethylene glycol is added to induce crystallization to obtain a high-purity solid product. The application uses the plasma technology to improve the leaching rate of germanium and inhibit the dissolution of silicon; the ionic liquid extraction system has good selectivity and effectively separates impurities; and the whole process is green and cyclic, by-products can be recycled, and environmental protection and economic benefits are improved.

The invention relates to the technical field of preparation of low-dielectric films, and particularly discloses a preparation device and process of a benzocyclobutenyl low-dielectric film. The preparation method comprises the following steps: S1, under the protection of inert gas, mixing a benzocyclobutenyl monomer, a photosensitizer and a specific solvent in proportion, and carrying out ultrasonic stirring to obtain a uniform photosensitive precursor solution A; s2, pretreating the surface of the base material by adopting an atmospheric pressure non-equilibrium plasma technology, and introducing an active functional group to obtain a surface-activated base material B; s3, applying gradient change coating pressure to the base material B, and uniformly coating the photosensitive precursor solution A on the surface of the base material; s4, the coated base material B sequentially passes through multi-stage temperature control drying systems in different temperature areas, and gradient heating is conducted; and S5, in a nitrogen protection atmosphere, performing high-precision curing on the dried base material by adopting an infrared laser heating technology to form the low-dielectric film, so that the influence on the service life and the performance stability of the low-dielectric film is avoided.

The invention discloses a low-temperature sterilization device and process for fresh and wet rice noodles based on a cold plasma technology, and relates to the technical field of rice noodle sterilization. The low-temperature sterilization device comprises a sterilization tank and a plasma generator which is arranged on one side of the sterilization tank and used for introducing cold plasma air mass into the sterilization tank, and a feeding assembly is arranged above the sterilization tank; a discharging assembly is arranged at the bottom of the sterilization tank, a mixing assembly and an air guide assembly are movably arranged in the sterilization tank, and the air guide assembly is located under the mixing assembly; the mixing assembly comprises a rotating shaft movably arranged in the middle of the interior of the sterilization tank, a plurality of spiral pieces fixedly arranged on the side face of the rotating shaft, and supporting assemblies fixedly arranged at the corners of the spiral pieces; the pressure of rice flour on the spiral piece is utilized to enable the spiral piece to generate obvious elastic deformation, and the supporting assembly is utilized to elastically support the spiral piece, so that the spiral piece shakes, and accumulation of the rice flour is avoided.

This invention provides a spirulina slurry sterilization and drying system based on low-temperature plasma technology, belonging to the field of microalgae product processing technology. It includes an air compressor, a plasma generator, a plasma jet head, a microalgae sterilization tank, a microalgae discharge device, a microalgae feeding device, a first adjustable pump, a second adjustable pump, a detection and sampling device, and a tail gas collection and treatment device. This system is simple to operate, highly efficient in sterilization, and addresses consumer concerns about irradiation sterilization and the high energy consumption of other sterilization methods. Utilizing a high-flow-rate plasma jet to simultaneously sterilize and dry at low temperatures significantly shortens the processing time for microalgae production, reduces the loss of heat-sensitive nutrients in microalgae, and improves product quality.

The application discloses a plasma modified polyurethane medical dressing and a preparation method and application thereof, and relates to the technical field of medical dressings. The polyurethane sponge is cleaned and dried, and then is treated by using a plasma technology in an oxygen atmosphere to obtain treated polyurethane sponge; then, recombinant collagen with a HIS tag is prepared into a recombinant collagen solution; then, metal ions with antibacterial effects are added into the solution; the treated polyurethane sponge in step S1 is contacted with the recombinant collagen solution; finally, the modified polyurethane medical dressing is immersed into a high-molecular solution with a low isoelectric point and a negative charge under a neutral condition, and the medical dressing is obtained after drying and washing after immersion. The preparation method avoids the use of chemical cross-linking agents, ingeniously uses the tag of the recombinant collagen, simplifies an antibacterial substance loading process, and enables the antibacterial agent not to be excessive, so that the antibacterial agent can be used for a long time at a wound and can be safely applied to the fields of negative pressure drainage and wound care.