102results about How to "Small aperture" patented technology

The invention discloses a preparation method of sandwich type immunomagnetic beads with high thermal stability, which comprises the following steps: by taking polystyrene microspheres as a template, introducing oil-phase Fe3O4 nanoparticles into the polystyrene microspheres through a swelling method, and then carrying out hydrolytic condensation reaction on the surface of a microsphere assembly by utilizing n-octyltrimethoxysilane OTMS to obtain the sandwich type immunomagnetic beads with high thermal stability. The preparation method comprises the following steps: carrying out surface amination modification on a silicon dioxide thin layer which is grown by hydrolysis of tetraethoxysilane TEOS to realize coating of an outermost organic shell layer, carrying out surface amination modification, and carrying out cross-linking on 1, 4-butanediol diglycidyl ether and erythritol on the surface to form an epoxy polymer layer so as to obtain the sandwich-type immunomagnetic bead with a cross-linked epoxy polymer layer introduced to the outer layer. According to the epoxy group modification process on the surface of the magnetic bead, a direct cross-linking modification process is adopted, so that the operation steps are simplified, and the obtained epoxy group magnetic bead is ensured to show excellent biocompatibility. In addition, the method omits the tedious process of functional group activation, and allows direct coupling with the antibody, thereby greatly improving the efficiency and convenience of the experiment.

The invention relates to the technical field of seawater desalination, in particular to a seawater desalination reverse osmosis membrane, a preparation method and application. The seawater desalination reverse osmosis membrane is prepared by the preparation method. The preparation method comprises the following steps: immersing the prepared support layer into a water phase solution, and then taking out the support layer adsorbing the water phase solution; immersing the support layer adsorbing the water phase solution into a first oil phase solution, and forming a primary reverse osmosis membrane through a first interfacial polymerization reaction; then, taking out the primary reverse osmosis membrane, and carrying out first drying treatment under a steam condition; and immersing the primary reverse osmosis membrane into a second oil phase solution, and carrying out a second interfacial polymerization reaction to form the seawater desalination reverse osmosis membrane. The application refers to the application of the reverse osmosis membrane for seawater desalination in the aspects of reclaimed water reuse, seawater desalination and brackish water desalination. According to the invention, the seawater desalination reverse osmosis membrane which simultaneously meets high desalination rate and high water flux can be prepared.

The utility model discloses a fisheye flat gasket stamping die which is characterized in that a fisheye extruding station, a punching station, a blanking station and a guide pin mounting station are correspondingly arranged on a concave die plate, a lower base plate and a lower die plate at the lower end part of the die; the female die plate is further provided with a conical rod mounting station and a guide punching rod avoiding station. And a fisheye extruding mounting station, a punching mounting station and a blanking mounting station which are respectively arranged corresponding to the fisheye extruding station, the punching station and the blanking station are arranged on a stripping template and an upper fixing plate at the lower end part of the die. The stripping template is further provided with a conical rod avoiding station, a guide pin avoiding station and a guide punching rod installing station which correspond to the conical rod installing station, the guide pin installing station and the guide punching rod avoiding station respectively. The punching die is high in punching efficiency, the material utilization rate can be remarkably increased, the high precision of the surface parallelism and planeness of the fisheye flat gasket can be guaranteed, and the punching die can be produced in a large scale.

The present application relates to the field of filling glue, and in particular to a high-flowability epoxy resin encapsulated bottom filling glue and a preparation method thereof. The high-flowability epoxy resin encapsulated bottom filling glue, in parts by mass, has the following raw materials: 40 to 60 parts of epoxy resin composition, 10 to 15 parts of active diluent, 20 to 25 parts of curing agent, 1 to 2 parts of accelerator, 20 to 35 parts of modified filler, 1 to 4 parts of coupling agent, 1 to 1.5 parts of leveling agent, and 1 to 3 parts of flame retardant. The epoxy resin encapsulated bottom filling glue prepared in the present application not only has good stress impact resistance, mechanical properties and flow properties, but also can maintain excellent moisture resistance, water resistance, corrosion resistance, acid and alkali resistance and other properties, thereby greatly improving the application performance of the filling glue and having very excellent application prospects.

The invention belongs to the technical field of settlement monitoring, and particularly relates to an automatic soft soil settlement monitoring device and method.The automatic soft soil settlement monitoring device comprises an inclinometer pipe, the inclinometer pipe comprises an inner pipe, the inner pipe is sleeved with an outer pipe, a settlement magnetic ring is slidably arranged in a gap between the inner pipe and the outer pipe in a sleeved mode, and an elastic piece is fixed to the outer wall of the settlement magnetic ring; a through groove allowing the elastic piece to extend out is formed in the outer pipe. The elastic pieces are folded on the inner sides of the through grooves through the binding assemblies; the cut-off assembly is used for releasing the limitation of the binding assembly on the elastic sheet so as to release the elastic sheet and enable the end part of the elastic sheet to extend out of the through groove to be inserted into the inner wall of the monitoring hole; the settlement magnetic ring is placed in the gap between the inner pipe and the outer pipe, the hole diameter of the monitoring hole is reduced as much as possible according to the diameter of the outer pipe, the gap between the outer wall of the inclinometer pipe and the monitoring hole does not need to be backfilled, the working intensity is reduced, detection soil on the hole wall is directly detected, and the monitoring result is more accurate.

The invention discloses a super-smooth anticorrosive coating for an overhead transmission conductor and a preparation method and application thereof.The super-smooth anticorrosive coating for the overhead transmission conductor is prepared from, by mass, 25-50 parts of polyvinyl fluoride resin, 12-50 parts of epoxy resin, 5-10 parts of butyl acetate, 5-10 parts of graphite fluoride, 5-8 parts of molybdenum disulfide, 5-20 parts of superfine aluminum oxide and 6-25 parts of zinc powder. And 1-12.5 parts of zinc phosphate. Surface modification and dynamic coating are carried out on the super-smooth filler particles, so that a layer of chemical inert film is formed on the surface of the filler, and the friction force between the particles and between the particles and a matrix is reduced. Meanwhile, a multi-stage dispersion technology is adopted, low-speed stirring is firstly carried out for primary mixing, and then gradual speed increasing is combined with ultrasonic treatment, so that aggregates of the filler can be fully destroyed, and a stable dispersion state is formed. The treatment can form a highly uniform super-lubricity network structure, improve the interface bonding between the filler and the matrix resin, reduce micropores in the coating and reduce the friction coefficient of the coating, so that the coating shows super-lubricity. And through ultrasonic oscillation treatment, preservative particles reach the nanoscale, the surface area and chemical activity of the particles are increased, the particles and matrix resin form more stable combination, and the anticorrosive effect of the coating is effectively improved.

The invention relates to the technical field of building roof greening, and discloses a building roof greening and rainwater recycling irrigation system which comprises a microcontroller, a greening module arranged on a building roof, a rainwater recycling module connected with the greening module and an irrigation module. The microcontroller is electrically connected with the greening module, the rainwater recycling module and the irrigation module; the greening module sequentially comprises a water collecting layer, a filtering layer, a protective layer, a pervious concrete layer, a nutrient soil layer and a vegetation layer from bottom to top. The rainwater recycling module comprises a water pumping pipe arranged at the top of the side wall of the water collecting layer and a rainwater recycling box connected with the water pumping pipe; the rainwater recycling box comprises a first filter box, a second filter box, a disinfection box and a clear water box which are sequentially arranged from top to bottom; the irrigation module comprises a first water suction pump connected with the clear water tank, a water outlet pipe connected with the first water suction pump, a water conveying pipe connected with the water outlet pipe, a drip irrigation pipe connected with the water conveying pipe and a water dropper. By means of the system, maximum utilization of rainwater resources and continuous improvement of the ecological environment are achieved.

The invention relates to the technical field of multi-layer fabrics, and discloses a moisture-permeable layered composite fabric and a preparation method thereof. The preparation method comprises the following steps: compounding polyvinylidene fluoride, an antibacterial agent and a solvent, and performing electrostatic spinning to obtain an inner-layer fabric; mixing an epoxy resin / waterborne polyurethane composite material with a beta-cyclodextrin / polytetrahydrofuran ether glycol compound, and performing electrostatic spinning to obtain a middle layer / inner layer composite fabric; and compounding and hot-pressing the middle-layer / inner-layer composite fabric and the outer-layer fabric to obtain the moisture-permeable layered composite fabric. The layered composite fabric has excellent waterproof and moisture permeable properties and good mechanical properties and antibacterial properties.

The invention belongs to the field of gas technical purification, and particularly relates to a honeycomb-shaped high-concentration NO2 adsorption trapping material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing adsorbent slurry by taking high-silicon molecular sieve raw powder as a raw material; (2) putting a honeycomb carrier into the adsorbent slurry for dipping and coating; and (3) naturally airing, drying and roasting the impregnated carrier to obtain the integral honeycomb-shaped high-concentration NO2 adsorbing and trapping material. On the basis of the honeycomb-shaped high-concentration NO2 adsorption trapping material (the molecular sieve silica-alumina ratio is 1000-5000), NO2 is efficiently trapped through a pressure swing adsorption technology, meanwhile, the adsorbent subjected to adsorption saturation is reversibly regenerated, high-concentration NO2 desorbed gas is obtained, NO2 recycling is achieved, NOx tail gas of a nuclear industry post-treatment plant is recycled, and the purpose of recycling the NOx tail gas of the nuclear industry post-treatment plant is achieved. A stable NO2 gas source is provided for a spent fuel post-treatment main process, the dual requirements of NO2 raw material preparation and tail gas denitration of a post-treatment plant are met, and purification and recycling of NO2 are achieved.

The application discloses a mesoporous carbon preparation process with recyclable silicon source and mesoporous carbon with small pore size and large specific surface area. The mesoporous carbon preparation process comprises the following steps: preparing a silicon template: reacting a fluosilicic acid solution with calcium carbonate, and separating calcium fluoride precipitate and silica sol; the pH of the silica sol is 2-5; the concentration of silicon dioxide in the silica sol is 1-8 wt%; preparing a precursor: dissolving a carbon source and an organic acid in the silica sol, drying, grinding, and carbonizing in an inert atmosphere to obtain a C / Si precursor; the organic acid comprises at least one of oxalic acid, tannic acid, acetic acid and citric acid; removing the silicon template and recycling the silicon source: treating the C / Si precursor with hydrofluoric acid, and performing solid-liquid separation to obtain mesoporous carbon and a fluosilicic acid solution, wherein the fluosilicic acid solution is used for preparing the silicon template. The specific surface area of the mesoporous carbon is greater than 800 m 2 / g, and the pore size is less than 6 nm.

This invention discloses a high-definition lens, comprising a first lens, a first cemented lens group, an aperture stop, a fourth lens, and a fifth lens arranged sequentially from the object plane to the image plane; wherein the first lens and the fourth lens have negative optical power; the first cemented lens group and the fifth lens have positive optical power, and the fifth lens has a biconvex structure; the focal length of the lens is f, and the focal length of the first cemented lens group is f. U1 f U1 The following relationship exists between f and f: 0.35 < |f U1 / f|<0.90. The lens formed by this invention is not only compact and economical, but also ensures high imaging resolution, small aperture and low distortion, which can meet the needs of industrial applications and has great market prospects and economic value.

After an insulating layer (14) and an electrolytic copper foil (15) are laminated in this order on an inner layer substrate (13), a resist pattern (17B) is formed on the electrolytic copper foil (15). Next, with the resist pattern (17B) as a resist, the electrolytic copper foil (15) is etched using an etching solution containing sulfuric acid and hydrogen peroxide, and a via hole formation mask (18) is formed. Next, the resist pattern (17B) is removed, and a via hole (14A) is formed by removing a portion of the insulating layer (14) that is not covered by the via hole formation mask (18) with a laser.

The laser chip and its fabrication method disclosed herein include a first reflective layer, an active region, an oxide layer, and a second reflective layer sequentially disposed on a substrate. The laser chip has a first trench and a second trench for oxidizing and etching the oxide layer. A first connecting portion connects one end of the first trench to one end of the second trench, and a second connecting portion connects the other end of the first trench to the other end of the second trench. Due to the influence of crystal anisotropy on the oxidation rate, and the mutual coordination of the first and second connecting portions on the oxidation rate, the oxide aperture includes a first oxide arc, a second oxide arc, a third oxide arc, and a fourth oxide arc. The first and second oxide arcs are arranged opposite each other, as are the third and fourth oxide arcs. The third and fourth oxide arcs have different radii of curvature, forming a specific irregular morphology. The oxide aperture based on the irregular morphology can effectively suppress transverse multimode lasing of the optical signal and reduce mode degeneracy.

The present invention discloses a highly breathable super absorbent diaper pad and a preparation method thereof, which belongs to the technical field of diaper pads, and comprises a protective layer, an absorption layer and an anti-reverse osmosis layer from top to bottom, wherein the protective layer is composed of antibacterial modified soybean protein viscose fiber, polyester fiber and ES fiber, the absorption layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber, and the anti-reverse osmosis layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber. The present invention adopts a three-layer non-woven fabric structure with gradual changes in pore size, hydrophilicity and disorder, which can accelerate urine absorption and prevent reverse osmosis; the present invention treats soybean protein to improve hydrophilicity, antibacterial property and air permeability, and the amphiphilicity can make urine diffuse and be absorbed faster and adjust water absorption balance; the present invention utilizes mannitol, hexafluorobutyl methacrylate and other ingredients to make the fiber have excellent water absorption, reduce surface energy, and form a network structure with block copolymer and sodium polyacrylate to improve water absorption and air permeability.

The utility model discloses a mounting structure of cooling coil of speed reducer, including cooling coil, the cooling coil includes: the coil body and two connecting pipes of connecting in two ends of the coil body respectively, the coil body is oblique spiral shape. The utility model discloses oblique spiral body facilitates the dismounting of cooling coil, and the contact area with the lubricating oil in the gear box body is big, and the conductivity is good, and the cooling effect is obvious, and the working efficiency of gear box is greatly improved.

The application discloses a kind of low basis weight high-density fiber material preparation methods, the fiber material includes fiber layer and hot melt powder layer;The fiber layer is filled with superfine powder;Including the following steps: (1) polyvinyl alcohol ultra-short fiber, polyester superfine ultra-short fiber, fine denier ultra-short cellulose fiber are made into mixed slurry, then wet-laid web is made;(2) the wet-laid web is consolidated into intermediate material, then the intermediate material hot water bath is made, and polyvinyl alcohol ultra-short fiber is dissolved;(3) superfine powder is made into suspension, and filled into intermediate material;(4) hot melt powder is made into suspension slurry and coated and fixed.Reduce the unit area mass of material, increase the density of material under low basis weight, utilize the thermal closing pore effect of superfine powder, ensure the safety of battery separator product.Realize the technical requirement of low basis weight, high density and high porosity, solve the problem that existing fiber material cannot meet the use requirement of battery separator.

This invention relates to the field of refractory materials technology, and more particularly to a cementless magnesia castable and its application method. The castable consists of aggregate, matrix material, and a water-reducing agent; the aggregate is 60-80 parts of magnesia particles; the matrix material is: fine magnesia powder, active α-Al₂O₃ micro powder, sintered corundum powder, silica micro powder, and aluminum-based metal microcapsules. The application method of the cementless magnesia castable is as follows: the water-reducing agent and matrix material are mixed evenly to obtain a premixed matrix material; the aggregate and premixed matrix material are stirred evenly, water is added and wet-mixed to obtain a slurry; the evenly mixed slurry is poured into a mold, vibrated to form the slurry, and then cured. This cementless magnesia castable exhibits certain initial strength, excellent high-temperature performance, excellent resistance to slag erosion and thermal shock, and a long service life, making it widely applicable in tundishes and ladles.

The invention discloses a GO composite membrane for high-selectivity separation of a low-molecular-weight cationic dye as well as a preparation method and application of the GO composite membrane. The composite membrane is constructed by coating a polymer ultrafiltration base membrane with polydopamine and alternately depositing composite graphene oxide and partially reduced graphene oxide. Wherein the composite graphene oxide is prepared by crosslinking crown ether amine and partially reduced graphene oxide. A cavity structure in the crown ether amine molecule can generate electrostatic interaction with the cationic dye, so that the selective interception of the composite membrane on the cationic dye is improved. The performance of the composite membrane can be optimized by controlling parameters such as a crown ether amine structure, the reduction degree of the graphene oxide, the loading proportion of the composite graphene oxide and the graphene oxide, and efficient separation of dyes with different molecular weights and charge types is realized. The GO composite membrane has high selectivity on low-molecular-weight cationic dyes, and is suitable for industrial printing and dyeing wastewater treatment, efficient dye separation and recovery and environmental pollution treatment.

The invention discloses a device for crushing and drying fresh Rhizoma Anemarrhenae epidermis and a process thereof, and relates to the technical field of crushing and drying of medicinal materials. The invention comprises a crushing body, a filtering component fixedly arranged at an air outlet end at the bottom of the crushing body, a gas dryer fixedly arranged at an air outlet end of the filtering component, and an air heating pump fixedly arranged at an air outlet end of the gas dryer, wherein the air outlet end of the air heating pump is connected to an air inlet end at the top of the crushing body; the crushing body comprises a shell component, a separation component movably arranged in the middle of the shell component, and a crushing component movably arranged inside the separation component; the shell component comprises a seat component, and a support component fixedly arranged above the seat component; the invention removes Rhizoma Anemarrhenae fibros, villi and epidermis by rubbing the surface of Rhizoma Anemarrhenae while drying, so that the Rhizoma Anemarrhenae fibros, villi and epidermis can be discharged in time, the surface of Rhizoma Anemarrhenae is less damaged, the Rhizoma Anemarrhenae pulp can be prevented from being damaged and wasted, and the peeling quality is high and the effect is good.

This invention provides a method for preparing bamboo fiber for textiles, belonging to the field of fiber extraction technology. The preparation method includes bamboo strip pretreatment, enzyme immobilization, and bamboo fiber extraction. The bamboo strip pretreatment method is as follows: whole bamboo is taken, crushed and cut, and bamboo strips with a length of 6-8 cm, a width of 0.5-0.7 cm, and a thickness of 0.3-0.5 cm are taken. The strips are ultrasonically treated for 25-35 min, then soaked in NaOH solution for 30-40 min, filtered, washed with deionized water until neutral, and dried to a moisture content of 15-20% to obtain pretreated bamboo strips. The bamboo fiber extracted by this invention has a tensile strength of 1.21-1.28 GPa, a breaking elongation of 4.09-4.17%, an elastic modulus of 37.15-37.26 GPa, and an average enzyme activity retention rate of 66.3-68.4% after 10 reuses.

Provided are a porous membrane and a method for producing the porous membrane, whereby the pore diameter can be reduced and the flow rate can be increased. A porous film containing (A) at least one resin component selected from the group consisting of a polyimide, a polyamideimide, and a polyethersulfone, and a solvent (S), in which the solvent (S) contains a nitrogen-containing polar solvent (S1) having a boiling point at atmospheric pressure of 200 DEG C or higher, and the content of the nitrogen-containing polar solvent (S1) in the porous film is 10 ppm to 2000 ppm (inclusive).

The utility model discloses a machine shell for oral cavity cleaning and an oral cavity cleaning device, the machine shell comprises a shell body and a cover body, the shell body is provided with an opening, and the cover body covers the opening of the shell body; the cover body and the shell are mutually nested in a preset direction, and a liquid storage cavity is defined by the cover body and the shell; a micro-channel is formed between the shell and the cover body; the micro-channel can allow gas to penetrate in the preset direction and prevent liquid from flowing out, and the micro-channel communicates the liquid storage cavity with the outside through an assembly gap between the shell and the cover. The casing for oral cavity cleaning and the oral cavity cleaning device have the effects of being free of holes in appearance, breathable and waterproof.

The invention relates to the technical field of fabric treatment equipment, and particularly provides a coating device for processing a high-air-permeability and moisture-permeability microporous coating fabric. The coating device for processing the highly breathable and moisture permeable microporous coated fabric comprises a coating frame body assembly, a winder, a re-drying instrument, a pressurizing assembly, a hot rolling assembly and a guide soaking assembly. Multi-stage drying and temperature control adjustment are provided, milder and more uniform curing, shaping and drying processes are further realized, and a microporous structure with smaller pore diameter and thicker pore wall can be formed, so that the body strength of a coating film is directly improved, and meanwhile, an extremely thin compact'skin layer 'can be formed on the surface of the microporous coating fabric; the surface of the coating is smoother and more uniform, internal micropores are protected, the wear resistance and flatness of the fabric are remarkably improved, in addition, the compact degree of the skin layer can be accurately controlled, the skin layer is compact enough to improve the wear resistance, a proper porous structure is kept, and the air permeability and moisture permeability are guaranteed.

This invention discloses a core-shell hydrogenation catalyst and its preparation method. The catalyst comprises a core layer and a shell layer, wherein the core layer is alumina loaded with an active metal component, and the shell layer is alumina loaded with molybdenum carbide. The active metal is at least one of Group VIII metals and at least one of Group VIB metals. The preparation method of the catalyst is as follows: first, boehmite powder is mixed with an organic acid solution and dried before introducing the active metal component. Then, after molding, a spherical core layer material is obtained. Then, under rolling spherical conditions, the obtained spherical core layer material, boehmite powder, molybdenum carbide powder, and an organic alcohol polymer solution are mixed evenly to obtain a catalyst precursor. Finally, the catalyst precursor is dried and calcined to obtain the core-shell hydrogenation catalyst. The hydrogenation catalyst provided by this invention is particularly suitable for the hydrogenation conversion of heavy oil, coal tar, and other oils containing macromolecular aromatics and polycyclic aromatic hydrocarbons.

The utility model relates to the technical field of oily water recovery, disclose a kind of adjustable type blow-off anti-spray device of compressor, including inner tube, reflector and body, inner tube and body are tubular parts, inner tube is set in body one end and is inserted into body interior, reflector is slidably arranged on inner tube, body and inner tube connection end are provided with first discharge port, the inside of body remote from inner tube end is sequentially provided with labyrinth section and second discharge port from top to bottom.The body interior adopts labyrinth structure and the umbrella-shaped capture board with small hole, the top of inner tube is provided with the reflector of height-adjustable, the depth of inner tube adjustable insertion body, to change the intensity and speed of liquid injection according to the height of pressure.Through this structure, the mixed liquid into the device can go its own way, lighter gas flows out from the top, and the liquid after decompression flows out from the bottom of the device, thereby avoiding the pollution of surrounding environment caused by the splashing of liquid under pressure.

The present application belongs to the technical field of water purification and sludge treatment equipment, and specifically discloses a sludge concentration tank for treating tap water and sludge water, which comprises a tank body, a central reaction cylinder arranged in the middle of the tank body, a water inlet pipe connected to the central reaction cylinder, a sludge accumulation area at the lower part of the tank body, a clarification area at the upper part of the tank body, and a balance tank connected to the sludge accumulation area; a plurality of annular water collecting and discharging pipes are fixedly arranged on the inner wall of the clarification area, the annular water collecting and discharging pipes are in communication with a total water outlet pipe, and the total water outlet pipe is connected to a water recycling tank; a plurality of water collecting holes are arranged at the bottom of each annular water collecting and discharging pipe, the number of water collecting holes increases from the bottom to the top, and a plurality of air vents are arranged at the top of each annular water collecting and discharging pipe; in addition to the uppermost annular water collecting and discharging pipe, an independent electric butterfly valve is arranged on each of the other annular water collecting and discharging pipes. The present application realizes the multiple functions of flow regulation, sedimentation, sludge concentration and sludge-water separation in one, reduces the occupied area, and is resistant to the impact of uneven sludge water discharge.

The present application relates to the field of potting glue, and in particular to a water-resistant chip potting glue and a preparation method thereof. The water-resistant chip potting glue comprises components A and B. The raw materials of component A are calculated by weight: 60-80 parts of complex polyol, 4-12 parts of plasticizer, 0.5-1.5 parts of antioxidant, 1.5-3 parts of leveling agent, 5-15 parts of filler, and 5-10 parts of auxiliary agent; the raw materials of component B are calculated by weight: 45-55 parts of isocyanate, 10-15 parts of isocyanate prepolymer, 0.5-1.2 parts of catalyst, and 1-1.5 parts of defoamer. The chip potting glue in the present application can improve the corrosion resistance, aging resistance, stability and other properties of the chip potting glue while maintaining excellent mechanical properties and waterproof properties of the potting glue, meet the needs of existing scientific and technological products for the diverse performance of potting glue, expand the application field and environment of potting glue and its potting chip, and have very excellent application prospects.

The invention discloses a graded multilayer water-resistant low-temperature rare-earth-based denitration catalytic fiber material and a preparation method and application thereof, the catalytic fiber material takes PAN fiber as a carrier and an MOF / MOF material formed by Ce-UiO-66 and ZIF-8 as an active component, and the surface of the active component is modified by pentafluorobenzene. According to the method, graded multi-layer synthesis of active components is controlled by adopting a special pore channel chip, pentafluorobenzene is taken as a surface modifier and an acid site enhancer, and the Ce-UiO-66 / ZIF-8-coated PAN catalytic fiber material is synthesized in one step by combining micro-fluidic electrostatic spinning with reaction self-heating. The catalyst synthesized by the method has a hierarchical multilayer MOF / MOF structure, is high in hydrophobicity and large in specific surface area, and can efficiently and stably realize the denitration target under the low-temperature flue gas working condition in the non-electric industry.

The present invention discloses an annular saliva suction tube, an oral saliva suction device, and a saliva suction method with a porous structure. The annular saliva suction tube is used to cooperate with an external suction device. The annular saliva suction tube includes a first tube body, which is annular so that its two ends are close to each other. The surface of the first tube body is provided with a plurality of saliva suction holes, and the saliva suction holes can allow saliva in the oral cavity to enter the first tube body; a second tube body, one end of which is connected to the two ends of the first tube body respectively, and the other end is used to connect to the external suction device, so that the saliva in the first tube body is discharged from the other end of the second tube body. The technical solution provided by the present invention adopts a porous structure, has a high suction efficiency, and a small pore size, is not easy to cause blockage in the tube or the instrument, is safer and more stable, and can meet the needs of different oral care work.

This utility model relates to the field of endoscopes, and provides an endoscope and its sensor packaging structure. The sensor packaging structure includes a base, a sensor, a steering prism, and a packaging bracket. The sensor and the packaging bracket are mounted on the base. The packaging bracket has a through-hole corresponding to the sensor position along the height direction of the sensor packaging structure. The steering prism is mounted on the side of the packaging bracket away from the base along the height direction and directly covers the through-hole. The steering prism, packaging bracket, and base are used to enclose a mounting cavity, in which the sensor is located. By mounting the steering prism on the packaging bracket and directly covering the through-hole, an additional protective glass is not required to cover the through-hole, thereby reducing the packaging height. This allows for increasing the height of the steering prism to improve imaging effects or reduce the overall aperture of the endoscope.