402 results about "Plasma activation" patented technology

The invention discloses a preparation method of a natural fiber prepreg with an improved impregnation effect, and relates to the technical field of composite material preparation, the method comprises the following steps: carrying out synergistic modification through fiber surface plasma activation and silane grafting, and combining a gradient pressure-temperature coupling impregnation system and ultrasonic-assisted permeation to prepare the natural fiber prepreg with the improved impregnation effect. And gradient filling and interface chemical bonding strengthening of the resin in the fiber bundle are realized. The core process comprises the following steps: pretreating fibers to improve surface energy and roughness, introducing a reactive diluent and a block copolymer into a resin system to regulate and control viscosity and transport capacity, constructing a pressure gradient by a multi-stage compression roller to drive resin to permeate into a bundle core, promoting uniform impregnation by infrared temperature control and ultrasonic cavitation, and finally obtaining uniform resin distribution and porosity lt. The interlayer shear strength is gt; and the high-performance prepreg is stable in batch under the pressure of 45 MPa. Reliable technical support and process guarantee are provided for large-scale engineering application of the high-performance natural fiber composite material.

The invention discloses a degradable bamboo fiber express packaging bag and a preparation method thereof, and belongs to the technical field of express packaging. The packaging bag is prepared from, by mass, 32-42 parts of pretreated bamboo fibers, 22-28 parts of poly (butylene succinate), 9-14 parts of modified nano calcium carbonate, 12-16 parts of polycaprolactone, 6-11 parts of acetylated chitosan and the like, and the key raw materials are all treated through an exclusive pretreatment or modification process. The preparation method comprises the steps of raw material plasma activation, segmented high-speed mixing, vacuum drying, precise-parameter twin-screw extrusion granulation, secondary drying, precise film blowing, high-precision heat-sealing bag making and the like, and the technological parameters of all the steps are clear. The product disclosed by the invention can be efficiently degraded in a natural environment, has excellent tensile resistance, puncture resistance and impact resistance, is stable and controllable in processing process, and is adaptive to actual requirements of express packaging and industrial batch production.

The invention discloses a dry-process high-temperature-resistant lithium battery diaphragm and a preparation method thereof, and relates to the technical field of lithium battery diaphragms. The specific preparation method comprises the following steps: activating and cross-linking polypropylene, polyimide, a PP-b-PI block copolymer and a cross-linking agent BIBP under the protection of nitrogen to prepare a polypropylene-polyimide matrix; after melting, adding a pre-sintered ZrO2-coated Al2O3 core-shell filler, hydroxylated boron nitride and zinc borate, and carrying out double-stage screw extrusion, ultrasonic orientation, nitrogen annealing and cold roller quenching to obtain a mixed melt; carrying out warm stretching and hot air circulation heat treatment to prepare a hard elastic crystal base film; carrying out stretching, thermal relaxation and thermal shaping to obtain a microporous base membrane; after slitting, plasma activation is carried out, epoxy silane and tetraethyl orthosilicate / polybenzimidazole aerogel precursors are sprayed, and a nano closed-pore coating is formed through pre-curing and heat shrinkage curing; and finally eliminating static electricity and rolling to obtain a finished product. The lithium battery diaphragm prepared by the invention is excellent in high temperature resistance and low in thermal shrinkage rate.

The invention relates to the technical field of fiber reinforcement, and discloses a melt impregnation weaving process of a flame-retardant fiber reinforced thermoplastic filling rope, the melt impregnation weaving process comprises fiber pretreatment, melt impregnation, multi-stage stretching setting, weaving forming and post-treatment, through the synergistic effect of plasma activation and nano flame-retardant pretreatment, the fiber surface activity and the flame retardant binding force are improved, and the flame-retardant fiber reinforced thermoplastic filling rope is obtained. Meanwhile, a segmented temperature control melt impregnation process is combined, so that the resin is ensured to form a uniform and complete coating layer on the surface of the fiber monofilament, the problems of weakening of interface bonding and non-uniform flame-retardant distribution in a traditional process are solved, and the flame-retardant efficiency and mechanical reliability of the filling rope are improved; a dynamic mathematical model of the tension gradient and the traction speed is established, the fiber crystallization orientation process is controlled, and the internal stress concentration phenomenon is eliminated; in combination with a dynamic tension compensation mechanism during weaving forming, the weaving tightness of the coating layer is corrected in real time, and the dimensional stability and the anti-fatigue performance of the filling rope under the complex load are guaranteed.

The invention relates to the technical field of road construction and maintenance, and discloses a multi-polymer modified emulsified asphalt in-situ cold recycling mixture and a preparation process thereof, the multi-polymer modified emulsified asphalt in-situ cold recycling mixture comprises the following components by weight: 600-680 parts of nano hybrid emulsified asphalt; 250 to 350 parts of plasma activated recycled aggregate; 15 to 30 parts of a microcapsule phase change catalyst; 5 to 10 parts of bio-based interface reinforcing fiber; and 3-8 parts of a rare earth doped curing accelerator. According to the invention, through multi-technology cross-scale fusion of a quaternary polymer rigid-flexible synergistic system, a gradient emulsification-vacuum self-assembly process, double-shell intelligent catalytic release and rare earth gradient distribution-magnetic field induced fiber arrangement, the bottlenecks of unbalanced high and low temperature performance, easy interface stripping, poor aging resistance, extensive process regulation and control and the like of a traditional asphalt material are overcome; and the strength and toughness-durability-self-adaption performance synergistic jump is realized.

The invention discloses a method for preparing a carbon monoxide normal-temperature oxidation catalyst based on electrolytic manganese residues and landfill leachate. The method comprises the following steps: soaking and purifying the electrolytic manganese residues with deionized water to obtain preliminarily purified electrolytic manganese residues; mixing aryl alcohol dehydrogenase, the preliminarily purified electrolytic manganese residues and the landfill leachate, and standing to obtain enzymolysis electrolytic manganese residue slurry; mixing fly ash, red mud and the enzymolysis electrolytic manganese slag slurry, uniformly stirring, drying and grinding to obtain a multi-component composite raw material; placing the multi-component composite raw material in low-temperature plasma equipment for irradiation to obtain a plasma activated composite material; and carrying out hydrothermal reaction on the plasma activated composite material to obtain a hydrothermal structure composite material, dipping the hydrothermal structure composite material in a solution containing cerium nitrate, drying, and roasting to obtain the carbon monoxide normal-temperature oxidation catalyst. The carbon monoxide normal-temperature oxidation catalyst with high activity and high moisture resistance is prepared by utilizing industrial wastes and landfill leachate enzymolysis derivative liquid.

The invention relates to the technical field of photovoltaics, and discloses photovoltaic conductive silver-coated copper micro powder and a preparation method thereof, and the preparation method aims to solve the problem that performance and cost of existing silver-coated copper micro powder in photovoltaic application are difficult to consider at the same time. Through pH adjustment, organic pre-bonding treatment and gradient ammonification, the activity of the copper powder is reserved, and a uniform copper-ammonia complexing layer is constructed; in the chemical silver plating stage, the pretreatment liquid is added into a composite base solution containing a complexing agent, organic amine, a dispersing agent and a combined reducing agent, and a silver-ammonia solution is dropwise added for reaction under ultrasonic dispersion and nitrogen introduction protection; and in the post-treatment stage, a finished product is obtained through ethanol reflux desorption, antioxidant treatment, vacuum drying, low-temperature plasma activation and screening, uniform and complete coating of a silver layer can be achieved under the low silver content, and a feasible path is provided for replacing photovoltaic pure silver powder with silver-coated copper micro powder on a large scale.

The invention relates to the technical field of cable manufacturing, and discloses a heat preservation frost crack prevention cable which comprises a conductor, an insulating layer and a double-layer co-extrusion functional sheath wrapping the outer side of the insulating layer, and the sheath is composed of a cold-resistant stable layer and a water stop gate layer which are arranged in sequence; nano silicon nitride dispersion liquid is added into the cold-resistant stable layer, polytetrafluoroethylene micro-powder is added into the water stop gate layer, and the nano silicon nitride dispersion liquid and the polytetrafluoroethylene micro-powder form a double protection system of physical blocking and structural supporting, so that interlayer bonding force is strengthened, interlayer gaps are reduced, and a moisture invasion path is blocked. The preparation method comprises the steps of raw material pretreatment, conductor cleaning and drying, insulating layer extrusion, plasma activation, double-layer co-extrusion and finished product drying. The cable solves the problem that a multi-layer sheath of an existing cable is prone to frost heaving cracking due to water infiltration, the frost heaving damage resistance is remarkably improved, the cable is suitable for the high-cold and high-humidity environment, and stable power transmission is guaranteed.

The invention provides a wear-resistant aerogel coating and a preparation method thereof, and belongs to the technical field of new coating materials. The method comprises the following steps: carrying out cleaning, coarsening and plasma activation pretreatment on the surface of a base material; the preparation method comprises the following steps: dissolving polyurethane in a solvent, adding a wear-resistant reinforced phase containing silicon dioxide and an acrylic acid material, uniformly dispersing, and adding a cross-linking agent for cross-linking reaction to form polyurethane aerogel slurry; and coating the surface of a pretreated base material with the slurry in the early stage of a cross-linking reaction, and then carrying out low-temperature or freeze-drying and heat treatment curing to obtain the wear-resistant aerogel coating. By compounding the polyurethane flexible skeleton and the wear-resistant reinforced phase, the wear resistance, adhesive force and structural stability of the coating are remarkably improved while the characteristics of light weight, porosity, heat insulation and buffering of aerogel are maintained, the coating is suitable for surface protection of various base materials under complex working conditions such as friction and impact, the process is simple and controllable, and the cost is low. And the method has a wide engineering application prospect.

The invention relates to the technical field of plasma equipment, in particular to a plasma reactor, a plasma activated water preparation device and a plasma activated water preparation method, and the plasma activated water preparation device comprises a dielectric barrier discharge unit and a pulse discharge unit. The pulse discharge unit is arranged above the dielectric barrier discharge unit, and a mixed fluid inlet is formed in the bottom of the dielectric barrier discharge unit. And the top of the pulse discharge area is provided with a mixed fluid outlet. One is that discharge of the dielectric barrier discharge unit and pulse discharge of the pulse discharge unit are utilized to respectively provide a large amount of active oxygen and active nitrogen, and two discharge units are integrated in one plasma reactor to realize mutual dissolution promotion of the active oxygen and the active nitrogen; secondly, the multiple stages of plasma reactors are connected in series, the stages are increased according to the water demand, the plasma dosage is ensured, and plasma activated water is prepared in a non-circular circulation mode; and thirdly, the mixing time of the gas-liquid mixed fluid in the preparation device of the plasma activated water is long, so that the waste of the active particles can be prevented.

The invention discloses a multi-layer polymeric membrane functional current collector and a preparation method thereof, a pole piece and a battery, and the preparation process comprises the following steps: S1, blending and granulating ultra-high molecular weight polyethylene and high density polyethylene to prepare a composite layer raw material; s2, adding the composite layer raw material and the middle layer nylon raw material into a screw extruder, and carrying out co-extrusion casting to form a composite layer-middle layer-composite layer three-layer structure film; s3, carrying out plasma activation treatment on the obtained three-layer structure film; s4, forming nanoscale pits in the outer surface of the three-layer structure film by dipping the three-layer structure film in the treating fluid; and S5, preparing a metal layer on the outer side of the three-layer structure film to obtain the multi-layer polymer film functional current collector. Through material blending optimization, multi-layer structure design and surface functionalization treatment, the mechanical property and dimensional stability of the current collector base film and the binding force between the current collector base film and a metal coating are remarkably improved.

The invention belongs to the technical field of powder metallurgy, and particularly discloses a stainless steel workpiece and a hot isostatic pressing preparation method and application thereof, and the hot isostatic pressing preparation method comprises the following steps: 1) preparing stainless steel powder, screening the stainless steel powder, and selecting powder in a set particle size range as a raw material; 2) carrying out plasma activation treatment on the raw materials; (3) the treated raw materials are put into a prefabricated sheath, and the sheath filled with powder is sequentially subjected to heating degassing treatment and seal welding treatment; (4) the treated sheath is subjected to segmented hot isostatic pressing forming treatment, and a workpiece blank with the sheath is obtained; (5) the obtained workpiece blank is subjected to heat treatment; according to the method, the bottleneck that in a traditional hot isostatic pressing process, PPB defects are difficult to control is broken through, PPB defect suppression and mechanical property collaborative improvement are achieved, and the stainless steel workpiece with more reliable performance is provided for the high-end field such as nuclear power.

The invention relates to the technical field of peep-proof film manufacturing, and discloses a high-light-transmittance peep-proof film based on surface modification and a preparation method of the high-light-transmittance peep-proof film. The preparation method comprises the following steps: sequentially carrying out plasma activation, ALD atomic layer deposition and HEMA carboxyl-based layer polymerization on a PET film to obtain a modified PET film; coating the modified PET film with a dispersion liquid prepared from a polystyrene-polymethylacrylic acid solution and graphene quantum dots to form a peep-proof layer; depositing a TiO2 layer and a SiO2 layer on the modified PET film to form a high refractive index layer; diamond particles, MoS2 nanosheets and resin are mixed and coated on the high-refractive-index layer to form the wear-resistant layer. The PET film is modified through plasma activation, atomic layer deposition and free radical polymerization, the physical adsorption limitation of a traditional coating is broken through, chemical covalent binding with a subsequent functional layer is achieved, meanwhile, a light scattering path is optimized by preparing a TiO2 / SiO2 alternating layer, and the peep-proof effect and the optical stability are improved.

The invention discloses a high-temperature-resistant flame-retardant wire harness and a preparation method thereof, and relates to the technical field of electric harnesses. The method comprises the following steps: firstly, introducing phosphorus and silicon flame-retardant elements on a polyethylene molecular chain through plasma activation and free radical grafting reaction to prepare phosphorus-silicon grafted modified polyethylene, then compounding aminated silicon dioxide and organic intercalated montmorillonite by using isophorone diisocyanate as a bridging agent to prepare the phosphorus-silicon grafted modified polyethylene composite material. The preparation method comprises the following steps: preparing an isocyanate-bridged silicon dioxide-montmorillonite composite filler to improve the dispersity and compatibility of the filler in a matrix, carrying out extrusion granulation on modified polyethylene, an ethylene-butyl acrylate copolymer, maleic anhydride grafted polyethylene, the composite filler, nano magnesium hydroxide and other additives to prepare polyethylene wire harness particles, and finally, carrying out extrusion granulation on the polyethylene wire harness particles to prepare the cable harness. And coating the surface of a copper core wire with the particles through a single-screw extrusion coating machine, and carrying out subsequent water cooling, steam treatment, drying and rolling to obtain a finished wire harness. The wire harness prepared by the invention has excellent high temperature resistance and flame retardance.

The invention provides a low-dielectric high-toughness alkali-free spherical glass powder modified copper-clad plate. The low-dielectric high-toughness alkali-free spherical glass powder modified copper-clad plate consists of a composite resin matrix, modified alkali-free spherical glass powder, a synergistic functional filler, an auxiliary agent, a reinforced base material and a conductive layer, the modified alkali-free spherical glass powder is subjected to gradient treatment of plasma activation, silane grafting and organic silicon coating, the particle size of the modified alkali-free spherical glass powder is 0.5-2 microns, the modified alkali-free spherical glass powder accounts for 10-20 parts by weight in the raw materials, and the content of organic functional groups on the surface of the modified alkali-free spherical glass powder is larger than or equal to 1.6 mmol / g.The invention further provides a preparation method of the low-dielectric high-toughness alkali-free spherical glass powder modified copper-clad plate. Compared with the prior art, the preparation method has the following beneficial effects that a double-resin blending and elastomer toughening system is constructed through a modification process of filler activation, silane grafting and organic silicon coating, and the technical bottleneck is solved in combination with an interface compatibility technology.

The invention discloses a preparation method of a carbon-based hollow heat insulation fiber, and belongs to the technical field of fiber materials. The method comprises the following steps: mixing and melting a polyacrylonitrile base material, carbon nanotubes, graphene nanosheets and a dispersing agent, and spinning through an annular hollow spinneret plate to form hollow nascent fibers; carrying out pre-oxidation and carbonization treatment to construct a carbon-based hollow framework; after the plasma activates the fiber surface, the functional coating is impregnated to endow high reflection and radiation heat dissipation performance. The silicon-impregnated carbon nanotubes are used for replacing carbon nanotubes, the heat resistance and the heat stability of the carbon nanotubes can be improved by adding silicon, the carbon nanotubes can play a better heat insulation role in a high-temperature environment, heat conduction is further reduced, the overall heat insulation effect of the fiber is improved, a silicon protection layer is formed on the surfaces of the silicon-impregnated carbon nanotubes, and the heat insulation effect of the fiber is improved. The loss of the carbon nano tube in the high-temperature oxidation process can be effectively reduced, the service life of the fiber is prolonged, and the compatibility between the silicon-impregnated carbon nano tube and the polyacrylonitrile base material is better.

The invention relates to the technical field of flame-retardant materials, in particular to a ceramic fiber composite resin fireproof flame-retardant material and a preparation method and application thereof. The ceramic fiber composite resin fireproof flame-retardant material comprises a ceramic fiber fireproof layer and a continuous glass fiber RTM (Resin Transfer Molding) layer, the ceramic fiber fireproof layer comprises fireproof ceramic fibers and nano oxide / modified nano oxide, and the surface of the ceramic fiber fireproof layer is subjected to plasma activation operation and silane coupling agent treatment. The ceramic fiber composite resin fireproof flame-retardant material has an excellent thermal runaway protection effect, and the bonding effect between the ceramic fiber fireproof layer and the continuous glass fiber RTM layer is excellent.

The invention discloses a preparation method of an optical fiber insulator, and relates to electrical equipment and insulator technologies, and the preparation method comprises the steps: carrying out spiral groove cutting on a composite core rod, and sequentially carrying out phosphating treatment, plasma activation and nano coating deposition treatment; performing fitting treatment on the optical fiber and the treated composite core rod; the surface of the composite core rod is wrapped with a prepared sheath, the sheath is of a microphase separation structure formed by mixing liquid crystal polymer LCP and hydrogenated nitrile rubber HNBR as base materials according to the specified mass ratio, injection molding is conducted through a magnetic field induction orientation technology, the axial thermal expansion coefficient of the sheath is reduced to 28 * 10 / K to be close to that of the core rod, and the core rod is made of a composite material. The radial thermal expansion coefficient is kept at 90 * 10 / K and is close to the umbrella skirt; the outer side of the sheath is provided with umbrella skirts, and the two ends of the composite core rod are provided with hardware fittings. According to the method, self-adaptive regulation and control of the thermal expansion coefficient of the sheath material can be realized, and the anchoring stability, the interface durability and the electrical reliability of the optical fiber are remarkably improved.

The invention relates to the technical field of environmental waste treatment, and discloses a preparation method of modified household garbage incineration fly ash, the modified household garbage incineration fly ash comprises the following components by mass: 90-99 parts of a fly ash matrix; 0.1 to 2 parts of a plasma activation layer; 0.5 to 8 parts of a silicon oxide coating layer; the preparation method comprises the following steps: pretreating the fly ash; performing plasma activation; preparing a mineralizing solution; performing biomimetic mineralization; and calcining at low temperature. The plasma activation layer is introduced, the silicon oxide coating layer is constructed, and the phosphorus oxide or the boron oxide is cooperatively introduced, so that the microstructure and the surface chemical property of the material are effectively optimized, the specific surface area and the pore volume of the material are increased, and a microporous, mesoporous and macropore synergistic multistage pore channel structure is constructed; the adsorption capacity and the adsorption rate of various waste gas pollutants are improved.

The invention discloses a pressure roller surface polishing process for biodegradable film processing. The pressure roller surface polishing process comprises the steps of base material pretreatment, gradient polishing, in-situ online quality detection, dynamic parameter adjustment and plasma activation post-treatment. Aiming at the special working condition of the large compression roller for wide biodegradable film production, five steps of base material pretreatment, gradient partition polishing, in-situ online detection, dynamic parameter adjustment and plasma activation are coordinated. A gradient polishing pre-compensation mechanism enables the straightness error of a working-state roller surface to be less than or equal to 3 mu m / m, and a light scattering source on the surface of a membrane material is thoroughly eliminated by combining a composite vibration auxiliary process; in addition, the composite vibration auxiliary polishing is combined with a three-order progressive fine polishing strategy, a super-uniform surface with Sa smaller than or equal to 0.05 mu m is achieved on the 3-meter scale, light scattering caused by micro scratches is eliminated, and the light transmittance of the 3-meter-wide PLA film is further improved.

The invention belongs to the technical field of battery materials, and mainly relates to a method for preparing porous carbon microspheres through microwave induction of high-entropy alloy-petroleum coke and application. The method comprises the following steps: performing low-temperature plasma activation treatment on crushed and sieved petroleum coke powder to obtain activated petroleum coke powder; mixing and reacting the activated petroleum coke powder with a salt solution containing at least five transition metals, and performing freeze drying to obtain a high-entropy alloy-petroleum coke composite material precursor; the high-entropy alloy-petroleum coke composite material precursor is subjected to microwave radiation treatment in an inert atmosphere, and a carbonized precursor of a spherical structure is obtained; and performing high-temperature activation treatment on the carbonized precursor with the spherical structure in an activation atmosphere, and performing acid pickling and drying to obtain the porous carbon microsphere material. According to the method, the porous carbon microsphere material with high specific surface area, high microporosity and excellent conductivity is prepared through plasma activation, multi-metal complexation, microwave radiation and high-temperature activation treatment, and can be applied to a negative electrode material of a lithium ion battery.

The invention provides an efficient surface treatment method for plastic gaskets, which comprises the following steps: S1, pretreatment: putting a plurality of groups of plastic gaskets into a tool basket, and sequentially carrying out ultrasonic degreasing by an ultrasonic cleaning machine, deionized water spraying washing by a spraying cleaning machine and vacuum drying by a vacuum drying oven; s2, plasma activation is conducted, specifically, the gasket is placed on a rotary carrying table of rotary plasma treatment equipment along with the tool basket, a plasma treatment cavity is vacuumized to 5-15 Pa, then treatment gas is introduced, a plasma generator is started, and the rotary carrying table drives the gasket to rotate at a constant speed during treatment; s3, functional coating coating is conducted, specifically, the activated gaskets are taken out and arranged to an ultrasonic atomization and electrostatic spraying all-in-one machine, and modified coating is coated; and S4, composite curing: pre-curing the coated gasket through an infrared pre-curing oven, and then transferring the gasket into an ultraviolet pre-curing oven for ultraviolet curing to obtain a finished product. According to the method, the treatment efficiency and uniformity are improved, and the coating adhesive force and the gasket performance are enhanced.

This invention discloses a photocatalytic negative oxygen ion near-field purification eyeglass component and its preparation method. The component includes an eyeglass substrate (lens or frame). From the inside out, the outer surface of the substrate is sequentially provided with a functional film layer, a plasma activation layer, and an outermost composite film layer of nitrogen-doped anatase titanium dioxide supported on a Pt-Au-Ag-Pd quaternary noble metal. This film is responsive to the entire visible light band from 400nm to 700nm and stably generates ≥1000 negative oxygen ions / cm³ within a 30cm near-field breathing zone of the wearer's mouth and nose under normal lighting conditions. It also achieves antibacterial and bacteriostatic effects, degradation of harmful gases, surface self-cleaning, and anti-fogging functions. This invention optimizes the film structure, allowing the photocatalyst to directly contact air and visible light, maximizing catalytic efficiency. It is also compatible with lenses and frames, integrating multiple effects such as eye protection, purification, antibacterial properties, and anti-fogging. The process is universal and mass-producible.

The invention relates to the technical field of cement admixtures, in particular to a preparation process of an environment-friendly cement raw material grinding-aid grinding agent. According to the process, electrolytic manganese residues and industrial waste alkali liquor are used as raw materials, and the core is that multi-step synergistic chemical modification is performed: firstly, the electrolytic manganese residues are subjected to low-temperature plasma activation pretreatment to increase surface active sites; secondly, carrying out graft copolymerization on lignin in the industrial waste alkali liquor by utilizing an RAFT (Reversible Addition-Fragmentation Chain Transfer) polymerization technology, and introducing carboxyl and amide groups to synthesize a zwitterionic polymer; then, mixing the modified electrolytic manganese residues with modified alkali liquor, and inducing to generate a nano precursor with a core-shell structure through a supramolecular self-assembly and bionic silicification principle; and finally, carrying out spray drying to obtain a final product. According to the mineralizer disclosed by the invention, the grindability and the burnability of cement raw materials can be remarkably improved, the clinker burning coal consumption can be reduced, more importantly, marine cement can be endowed with excellent chloride ion penetration resistance, and meanwhile, high-added-value resource utilization of solid wastes is realized.

The invention discloses a low-temperature bonding method and a bonded wafer, and belongs to the technical field of wafer bonding. The method comprises the following steps of: (1) performing plasma enhanced chemical vapor deposition on a non-bonding surface of a substrate wafer and / or a piezoelectric wafer to form a SiO2 layer; (2) performing plasma activation treatment on the piezoelectric wafer and the substrate wafer; (3) cleaning and blow-drying the activated piezoelectric wafer and the substrate wafer, and forming an oxide layer with the thickness of at least 1.5 nm on the surface of the cleaned and blow-dried substrate wafer; (4) laminating the piezoelectric wafer obtained in the step (3) with a substrate wafer, and carrying out pre-bonding under 0.9 * 10 < 5 >-1.2 * 10 < 5 > Pa and the humidity of 50%-70%; and (4) annealing the pre-bonded wafer to obtain a bonded wafer. According to the method, the bonding strength can be effectively improved, defects such as holes are avoided, and the performance stability of the bonded wafer is improved.

A preparation method of a Cu-HHTP-PPy / stainless steel mesh oil-water separation membrane comprises the following steps: depositing polypyrrole on the surface of a stainless steel mesh to obtain a PPy / stainless steel mesh; pPy / stainless steel is subjected to plasma activating treatment and then placed in a copper acetate solution to be soaked, then the PPy / stainless steel is placed in HHTP, and the Cu-HHTP-PPy / stainless steel mesh separation membrane is obtained through electrochemical auxiliary soaking treatment. The Cu-HHTP-PPy / stainless steel mesh oil-water separation membrane prepared by the invention has super-hydrophilicity-underwater super-oleophobicity, also has electrothermal-photothermal properties, has an underwater oleophobic contact angle of 155 degrees, has efficient oil-water separation performance for different oils, has oil-water separation efficiency of 99% or more, also has relatively high permeation flux and excellent cycle stability, and can be applied to the field of oil-water separation. After circulation for more than 30 times, the oil-water separation efficiency still reaches more than 99%, and the permeation flux stably fluctuates in a relatively small range.

The invention discloses an organic solvent-resistant nanofiltration membrane and a preparation method thereof, and belongs to the technical field of nanofiltration membranes. The preparation method comprises the following steps: performing plasma treatment on a PE (Poly Ethylene) porous base membrane, vacuumizing, introducing inert gas for plasma activation, introducing amino-containing precursor gas for amination, and performing vacuum impurity removal and normal-pressure inflation to obtain an aminated base membrane; and immersing into a water-phase solution containing a water-phase monomer and an imidazole monomer, taking out, removing redundant solution, covering the plasma treatment surface with an organic-phase solution, carrying out interfacial polymerization to form a polyamide composite desalination layer containing an imidazole structure, and drying to obtain a finished product. The desalination layer in the prepared nanofiltration membrane is connected with the base membrane through a C-N covalent bond, the retention rate of MgSO4 is greater than or equal to 99.16% and the permeability of DMF is greater than or equal to 93.54% for a 10g / L DMF and 2000ppm MgSO4 system under the conditions of 1MPa and 25 DEG C, and the performance is stable after the DMF is soaked for 30 days.

The invention discloses a micro-through-hole structure polymer metallization method for guided wave transmission, and belongs to the technical field of photoelectric device processing, a polymer substrate is used for replacing a traditional all-metal material, and the micro-through-hole structure polymer metallization method for guided wave transmission is achieved through the multi-stage processes of plasma activation, chemical coarsening, sensitization, chemical plating, electroplating and the like. And forming a compact and high-adhesion metal layer on the inner surface of the through hole of the polymer substrate. In the process, a microfluid pump or a peristaltic pump is adopted to drive the solution to circularly flow in the through hole and the microcavity. According to the micro-through-hole structure polymer metallization method for guided wave transmission, dynamic flowing of a chemical plating solution in a micro-through hole and an internal cavity is achieved by introducing a micro-fluid pump or a peristaltic pump, and therefore a uniform, compact and firmly-attached metal layer is obtained.

The invention relates to the technical field of electronic paste, and discloses wear-resistant environment-friendly conductive silver paste and a preparation method thereof.The preparation method comprises the following steps of silver powder pretreatment, environment-friendly resin system preparation, conductive reinforced phase modification, paste compounding and curing treatment; according to the preparation method, a compound system of the flaky silver powder and the spherical silver powder forms a high-activity surface after plasma activation, chemical bonding is formed through the ring-opening cross-linking reaction with the bio-based epoxy resin, a three-dimensional conductive network is constructed by means of the vertical bridging effect of the nano-zinc oxide whiskers, and the electron tunneling effect among silver particles is enhanced; and meanwhile, the silicon carbide nanoparticles are embedded into a resin matrix to form a hard supporting point, a chemical bonding layer established by a silane coupling agent at an interface bonding position inhibits microstress concentration, the mechanical stability and deformation resistance of a conductive path are synergistically improved, and the technical bottleneck that a conductive network is prone to fracture under the working condition of high-frequency friction of traditional silver paste is broken through.

The invention relates to the technical field of films, in particular to a preparation method and application of a waterproof and oil-proof ventilation valve for food packaging. The preparation method comprises the following steps: carrying out plasma activation treatment on the porous polytetrafluoroethylene-based membrane; preparing fluoroalkyl silane modified silicon dioxide nano particles; preparing fluorine-containing organic silicon-silicon dioxide sol containing vinyl; a cross-linking layer is constructed through vacuum impregnation; preparing a hydrophilic / hydrophobic comonomer solution; copolymerized chain grafting is initiated by ultraviolet light; and water-based fluorocarbon emulsion is sprayed on the surface for curing. The obtained breather valve has super-hydrophobic and oleophobic characteristics, keeps high air permeability and high water vapor permeability at the same time, has the air permeability retention rate exceeding 95% after 10 times of moist heat sterilization, and is suitable for balancing internal and external pressure and blocking water and oil phase liquid permeation in the high-temperature and high-pressure sterilization process of a food packaging container.