637 results about "Ultraviolet irradiation" patented technology

The invention discloses a hydroxyl-rich ruthenium / titanium dioxide catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, loading a ruthenium precursor on a titanium dioxide carrier by adopting an impregnation method or a deposition-precipitation method, and drying and calcining to obtain a Ru / TiO2 catalyst; and step 2, placing the Ru / TiO2 catalyst in an atmosphere environment containing water vapor or forming a physical adsorption water film on the surface of the Ru / TiO2 catalyst, and performing ultraviolet irradiation treatment to obtain the Ru / TiO2 catalyst. According to the method, water is physically adsorbed through ultraviolet light dissociation, hydroxyl is directly generated on the surface of Ru / TiO2 in an in-situ mode, the method is easy to operate, complex liquid phase treatment is not needed, and the stability of the generated hydroxyl under the subsequent high-temperature gas-solid phase hydrogen-rich reaction condition is obviously superior to that of hydroxyl introduced through a traditional method. The stable hydroxyl enriched on the surface serves as an effective Lewis base site and cooperates with a Ru active site, adsorption and activation of CO2 molecules are remarkably promoted, and therefore the catalytic activity of the CO2 methanation reaction is greatly improved.

The invention provides a high-precision device and method capable of automatically adjusting the curing shape of UV glue, the high-precision device comprises an ultraviolet lamp module used for curing the UV glue, and a pitching adjusting mechanism and a front-back adjusting mechanism which are used for adjusting the ultraviolet lamp module, and a camera and an ultrasonic sensor are installed on the ultraviolet lamp module. The actual effect image of current ultraviolet irradiation is obtained through the camera, and the distance between the current grating and the irradiated object is measured through the ultrasonic sensor. The pitching adjusting mechanism is adjusted according to an image acquired by the camera, so that ultraviolet rays emitted by the ultraviolet lamp module are accurately irradiated to a UV glue part, needing to be cured, of an irradiated object; besides, the brightest position of each stripe in the image is identified, the distance x between the brightest positions of the adjacent stripes is calculated, the actually measured distance x is compared with the calculated theoretical distance, and the distance between the irradiated object and the grating is adjusted through a front-back adjusting mechanism, so that the consistency of the irradiated object and the grating is ensured, and the accuracy of the adjustment is verified.

The invention discloses a preparation method of a 3MDT dimming film and application of the 3MDT dimming film to automobile glass, and relates to the technical field of dimming films. The preparation method of the 3MDT dimming thin film comprises the following steps: uniformly mixing isobornyl acrylate, a cross-linking agent and a photoinitiator, adding a functional filler, stirring and uniformly mixing, adding micromolecular nematic liquid crystal, and stirring to obtain a liquid crystal composite system; injecting the liquid crystal composite system into a liquid crystal box, and performing ultraviolet irradiation to obtain an interlayer film; two PET plastic films serve as substrates, the inner surfaces of the substrates are coated with ITO conductive coatings, the interlayer film is arranged between the two substrates, and the 3MDT dimming film is obtained. The prepared 3MDT dimming film has good heat insulation performance and mechanical performance, the interlayer film of the 3MDT dimming film has excellent hydrophobic performance, and the 3MDT dimming film is suitable for being applied to the aspect of automobile glass.

The invention discloses an imidazole derivative curing agent and a preparation method of a space stiffening material with low volatility and high stability, and belongs to the field of preparation of space developing materials. The method comprises the following steps: mixing a light curing agent, an imidazole derivative curing agent, acrylate resin and epoxy resin, vacuumizing, removing bubbles, pouring into a standard dumbbell spline mold, carrying out ultraviolet irradiation for 10-20 minutes to prepare a flexible material of a first network, then pre-curing at 130-150 DEG C for 3-4 hours, and curing at 170-180 DEG C for 3-5 hours to obtain a rigid material. Through molecular synthesis scheme design, the high-molecular-weight imidazole derivative is prepared, the reaction activity is reduced, the storage life is prolonged, and the problems of small molecule migration and vacuum gas outlet are solved. Due to the molecular scheme design, more imidazole groups are introduced to a molecular chain and can be coordinated with metal ions to form ionic bonds, so that the reaction activity can be further reduced, the storage period can be prolonged, the molecular weight can be correspondingly increased, and the migration condition can be inhibited.

The invention belongs to the technical field of two-dimensional material preparation, and provides a method for preparing an MXene material based on a free radical mechanism, and the method comprises the following steps: S1, carrying out acid pickling on MAX phase powder to obtain an acid pickling precursor; s2, mixing the pickling precursor, an organic halogenation reagent and a buffer reagent, and then performing an etching reaction under an ultraviolet irradiation condition; s3, after the etching reaction is completed, an obtained product is cleaned and dried, and the MXene material is obtained. According to the method, the organic halogenation reagent is irradiated by ultraviolet light, so that the halogen free radicals are excited, and the halogen free radicals are used as an etching agent to realize selective etching of the A layer in the MAX phase material, so that the MXene material is prepared. The method has the characteristics of safety and environmental protection.

The present invention discloses a sea dragon-derived antimicrobial peptide, SsPle, for antimicrobial applications in the complex environments of tropical islands and reefs. The amino acid sequence of this antimicrobial peptide is shown in SEQ ID NO. 3. This antimicrobial peptide, SsPle, exhibits good water solubility, broad antimicrobial activity, and highly stable antimicrobial properties under high temperature, high salt, and ultraviolet irradiation conditions. It can inhibit the release of free bacterial endotoxins and has significant application prospects as an eco-friendly antimicrobial agent in the unique environments of South China Sea islands and reefs.

The invention relates to a wear-resistant waterproof cable sheath material and a preparation method thereof, and belongs to the technical field of cable materials. The cable sheath material is prepared by self-making a modifier and blending the modifier with a fumed silica modified filler modified by a perfluoroalkyl silane coupling agent, FEP and polyethylene. Perfluoroalkyl of the modified filler and FEP cooperate to improve the water resistance and corrosion resistance of the material; the modifier can enhance the polarity of a polyethylene matrix, forms polarity gradient matching with other components of the system, enhances the interfacial compatibility, and improves the mechanical properties of the material; a benzotriazole structure in the modifier can prevent the material from being damaged by ultraviolet irradiation; besides, during combustion, phosphorus in the material forms a carbon layer on the surface, nitrogen in benzotriazole serves as a foaming agent to expand the carbon layer, efficient flame retardance is achieved synergistically, the material has excellent ultraviolet resistance and flame retardance, and the service life of the material is prolonged.

The invention belongs to the field of composite materials, and discloses a degradable composite film material and a preparation method thereof.The preparation method comprises the steps that under the inert atmosphere, starch is modified through ultraviolet radiation and then mixed with a complexing plasticizer to obtain a mixture, then a silane activation solution is added, and heating and stirring are conducted to obtain a modified starch solution; in an inert atmosphere, melting the modified starch solution and a polymer at 150-180 DEG C in different temperature zones, adding a nano filler, and mixing to obtain a compound; and adding the compound into a film blowing machine to obtain a composite film, and carrying out heat treatment on the composite film to obtain the degradable composite film material. According to the method, the mechanical property and hydrophobicity of the degradable composite film are improved.

The invention discloses a surface protective film and a preparation method thereof, and belongs to the technical field of protective films. The surface protection film comprises a surface layer, a core layer and a bonding layer which are arranged in sequence, the surface layer comprises first polypropylene matrix resin, an organic ultraviolet absorbent and an inorganic ultraviolet screening agent; the core layer comprises second polypropylene matrix resin, polyaryletherketone nanofibers and flaky mica powder of which the surface is coated with cerium oxide; the bonding layer comprises a thermoplastic SEBS elastomer, hydrogenated bonding resin, an organic zinc compound, an ultraviolet light stabilizer and a plasticizer containing an epoxy group. The surface protection film has excellent ultraviolet aging resistance and high temperature resistance, the adhesive force can still be kept within a certain range under the conditions of ultraviolet radiation and high temperature, the surface protection film can be easily unwound under the condition of high temperature, and no residual adhesive is separated out.

The invention provides a lipoic acid-based nano-enzyme and a preparation method and application thereof, firstly, lipoic acid is dissolved in an organic solvent by utilizing the amphipathy of the lipoic acid and is self-assembled in water to form a nano-aggregate, and then ring opening polymerization of the lipoic acid is initiated by ultraviolet irradiation to obtain stable lipoic acid nano-particles, namely the lipoic acid-based nano-enzyme. The lipoic acid-based nano-enzyme has the beneficial effects that the preparation method of the lipoic acid-based nano-enzyme prepared by the method is simple, the lipoic acid-based nano-enzyme has stable particle size, good active oxygen scavenging ability and blood brain barrier crossing ability, and in addition, a cavity in the nano-enzyme is suitable for loading hydrophobic bioactive factors and drugs, so that the lipoic acid-based nano-enzyme has a good application prospect. Rich carboxyl groups on the surface of the nano-enzyme can be complexed with various ions, and the nano-enzyme can be applied to treatment of inflammation diseases caused by hypoxia or ischemia and the like and brain drug delivery.

The invention relates to a carboxyl-terminated polyester-based polyurethane UV viscosity-reducing adhesive and a preparation method thereof, and belongs to the technical field of new materials. The polyurethane UV viscosity-reducing adhesive provided by the invention is used for wafer manufacturing. The preparation method comprises the following steps: dissolving itaconic acid and 1, 4-butanediol in a solvent, and carrying out a heating reaction under the action of a catalyst to prepare a carboxyl-terminated prepolymer; carrying out ring-opening reaction on the carboxyl-terminated prepolymer and glycidyl methacrylate under the action of a catalyst to prepare hydroxyl-terminated polyester; the preparation method comprises the following steps: reacting hydroxyl-terminated polyester with isocyanate, and introducing a chain extender and a photoinitiator to prepare the rapidly-cured UV viscosity-reducing adhesive. The polyurethane UV viscosity-reducing glue is coated on a polyolefin film, the peeling strength at 180 degrees before ultraviolet irradiation after curing is 23.21-30.29 N / 25 mm, and the peeling strength at 180 degrees after ultraviolet irradiation is 0.07-0.19 N / 25 mm. According to the invention, the carboxyl-terminated prepolymer and glycidyl methacrylate are subjected to a ring-opening reaction, the viscosity reducing effect after UV irradiation is significant due to increase of double bonds, the 180-degree peel strength after UV irradiation is reduced, and no adhesive residue and degumming are realized.

The invention discloses a composite material liner and a production process thereof, and the production process comprises the following steps: carrying out plasma surface activation treatment on a foam substrate to obtain an activated foam substrate; the activated foam substrate and a polyester film are placed in ultraviolet irradiation equipment to be subjected to modified composite treatment, and a composite base material is obtained; performing line-by-line irradiation on the composite base material along a preset grid pattern based on a laser, forming a groove network structure on the surface of the composite base material, and obtaining a grid base material with grid identification lines; the grid base material is subjected to nanometer coating spraying treatment, and a coating base material is obtained; the coating base material is subjected to hot-pressing shaping treatment, and a semi-finished liner product is obtained; and the semi-finished liner is subjected to laser cutting treatment according to the preset size, and the composite liner is obtained. Through the integrated process design, the technical bottleneck that in the prior art, the surface structure machining precision is insufficient is remarkably overcome, and the applicability and reliability of the product in the electronic equipment industry, the automotive trim industry and the packaging industry are remarkably improved.

The invention discloses a nanofiber based on a polypeptide derivative and an enzymatic self-assembly method and application of the nanofiber based on the polypeptide derivative, the sequence of the polypeptide derivative is Nap-Gly-Phe-Phe-pTyr-Lys-Trp-Tyr-Gln-Asn-Met-Ile-Arg, and the Gly-Phe-Phe-pTyr is of an L configuration or a D configuration. The self-assembled polypeptide derivative disclosed by the invention contains an alkaline phosphatase restriction enzyme cutting site, and the self-assembled polypeptide derivative is self-assembled at a specific part with high enzyme specificity expression through enzyme catalysis to form nanofibers. The nanofiber hydrogel obtained through enzymatic treatment is carried out under physiological conditions, high temperature or ultraviolet irradiation is not needed, damage of high temperature to bioactive substances is avoided, the nanofiber hydrogel is more suitable for a temperature-sensitive in-vivo environment, toxic chemical cross-linking agents or photoinitiators do not need to be introduced, the cytotoxicity of the material is remarkably reduced, active enzymes or drugs can be embedded in situ, and the nanofiber hydrogel can be used for in-situ treatment. The biological function is maintained.

The invention discloses a silver nanowire and polymer composite transparent conductive film and a preparation method thereof, and belongs to the field of conductive films. According to the preparation method disclosed by the invention, hydroxylation treatment is performed on the surface of AgNWs through ultraviolet irradiation induction to generate a large number of-OH groups, and the-OH groups and sulfonic acid groups (-SO3H) in PEDOT: PSS form chemical bonding, so that the contact resistance between the AgNWs and the PEDOT: PSS is remarkably reduced, and a continuous and efficient conductive network is constructed. Meanwhile, the tight coating structure of hydroxylated AgNWs and PEDOT: PSS effectively inhibits oxidation and ion migration of the silver nanowires in a humid and hot environment, and the stability of the transparent conductive film is remarkably improved.

The invention relates to the technical field of life cycle prediction, in particular to an intelligent life cycle prediction method and system for a plastic product, and the method comprises the following steps: collecting raw material information, production process parameters and historical use data of the plastic product; based on the collected data, evaluating the aging rate and performance degradation of the plastic product by adopting a statistical analysis method; the aging rate is adjusted based on environmental factors (temperature, humidity and ultraviolet irradiation intensity) so as to simulate the influence under actual use conditions; based on the analysis result, establishing a comprehensive prediction model to reflect the influence of different factors on the life cycle of the plastic product; according to the method, various influence factors are comprehensively considered, advanced analysis technologies are applied, the life cycle of the plastic product can be predicted more accurately, and the comprehensive analysis not only improves the prediction accuracy, but also enhances the credibility of a prediction result.

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides an accelerated test method for aging of an aluminum alloy aircraft plate. The method comprises the following steps: carrying out a cyclic alternating test of ultraviolet irradiation and solution soaking on an aluminum alloy sample with an epoxy coating, and simulating a multi-factor coupling aging process in an aviation service environment. And regularly observing and recording micro-defects such as micropores, cracks and spalling on the surface of the coating in a test period, and evaluating the development of the micro-defects of the coating through qualitative and quantitative analysis. And after the test is finished, measuring the residual thickness of the sample, and establishing a relation model between the coating thickness degradation and the change of microdefect development along with the aging time in combination with the microdefect development state. According to the method, the actual aviation service environment can be simulated, the ultraviolet aging and corrosion coupling effect is considered, and accurate prediction and accelerated simulation of the aging behavior of the aluminum alloy aircraft plate with the epoxy coating are achieved.

The invention discloses a high-toughness double-network hydrogel electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving carrageenan in deionized water, magnetically stirring and heating until the carrageenan is completely dissolved, cooling, and adding a ZnSO4 solution for pre-crosslinking to form a carrageen-Zn < 2 + > solution; dissolving AM and a cross-linking agent in water to form an AM monomer solution; mixing with a carrageen-Zn < 2 + > solution, adding glycerol as a plasticizer, and uniformly stirring for plasticizing; and adding a photoinitiator, carrying out ultraviolet radiation to form a PAM chemical cross-linked network so as to obtain double-network hydrogel, and soaking the double-network hydrogel in a mixed solution of ZnSO4 and boric acid to strengthen the cross-linked network, thereby obtaining the hydrogel. The high-toughness double-network hydrogel electrolyte is stable in structure, excellent in conductivity, high in mechanical strength and good in flexibility, dendritic crystal growth can be inhibited, the ion migration efficiency and the interface stability can be improved, and the high-toughness double-network hydrogel electrolyte has wide prospects when being used for flexible electronic devices, new energy systems and other energy storage devices.

The invention discloses a preparation method of TiO2 powder with a rutile and anatase core-shell structure, and particularly relates to the technical field of photocatalytic material preparation. According to the method, rutile phase TiO2 powder is used as a core material, a titanate intermediate layer is formed on the surface of a particle through an accurately controlled hydrothermal alkali treatment process, and then a surface layer phase is converted into an anatase phase through acid pickling treatment and controllable heat treatment, so that a complete core-shell heterojunction structure is constructed. The process flow is relatively simple, the cost is controllable, the phase structure conversion rate is high, and the shell thickness can be accurately regulated and controlled. The obtained TiO2 core-shell structure powder has excellent structural stability of a rutile phase and high surface reaction activity of an anatase phase, and shows remarkably enhanced photocatalytic degradation performance under the condition of ultraviolet irradiation, and the catalytic efficiency of the TiO2 core-shell structure powder is greatly improved compared with that of single rutile phase TiO2; and a new process method is provided for large-scale preparation of efficient photocatalytic materials.

The invention discloses an anti-ultraviolet functional plastic particle and a preparation method thereof, and belongs to the technical field of polymer modified materials. The plastic particles are prepared from polyolefin resin subjected to organic silicon-phenolic hydroxyl synergistic grafting modification, 2, 4-dihydroxyacetophenone, an antioxidant, a hindered amine light stabilizer, a lubrication dispersant and an anti-yellowing agent. A siloxane-phenolic hydroxyl bifunctional chain segment is introduced into the surface of a molecular chain of the polyolefin resin subjected to organic silicon-phenolic hydroxyl synergistic grafting modification, so that a flexible-rigid synergistic interface layer is formed; the 2, 4-dihydroxyacetophenone has a hydroxyl and carbonyl conjugated structure and can form hydrogen bond complexation with a matrix, so that free radical degradation is effectively inhibited. The preparation method disclosed by the invention comprises the following three steps: grafting reaction of polyolefin resin subjected to organic silicon-phenolic hydroxyl synergistic grafting modification, high-speed mixing and melt blending granulation. Tests show that after the plastic particles are subjected to 365nm ultraviolet radiation for 500h, the tensile strength retention rate exceeds 94%, the chromatic aberration delta E is less than or equal to 1.5, the oxidation induction time is prolonged to 55min, and the plastic particles have excellent ultraviolet aging resistance, yellowing resistance and thermal oxidation stability.

The invention belongs to the technical field of high polymer materials, and discloses copolyester based on 4-aryl-epsilon-caprolactone and lactide as well as a preparation method and application of the copolyester. The copolyester is composed of a lactide structural unit and a 4-aryl-epsilon-caprolactone structural unit. A rigid benzene ring is introduced into a molecular chain, so that the synergistic balance of toughness and rigidity is successfully realized, and the toughness is remarkably improved while the high strength of the material is maintained. In addition, the introduction of phenyl endows the material with intrinsic ultraviolet resistance, the material can be used as an efficient ultraviolet absorbent, protective spherical protrusions are formed on the surface of the material under ultraviolet irradiation, and photooxidative degradation is effectively delayed. The material can be widely applied to the fields of high-performance degradable packaging, biomedical materials, outdoor articles, textiles and the like.

The invention belongs to the field of OLED (organic light emitting diode) luminescent materials, and particularly relates to an OLED organic small molecular luminescent material with a self-repairing function, which is composed of 90-99.9% by mass of host luminescent molecules A and 0.1-10% by mass of dynamic covalent cross-linking agent B. The mass ratio of the host luminescent molecules A is 90-99.9%, the mass ratio of the dynamic covalent cross-linking agent B is 0.1-10%, and the mass ratio of the host luminescent molecules A to the dynamic covalent cross-linking agent B is 0.1-10%. The structural general formula of the main body light-emitting molecule A is Ar1-L-Ar2. According to the OLED organic small-molecular luminescent material with the self-repairing function, a reversible dynamic cross-linked network is constructed through reasonable proportioning of the host luminescent molecules A and the dynamic covalent cross-linking agent B (the proportion of the host molecules is 90%-99.9%, and the proportion of the cross-linking agent is 0.1%-10%). When the light-emitting layer has defects due to aging, thermal stress or mechanical damage, external stimulation (heating at the temperature of 50 DEG C to 150 DEG C or ultraviolet irradiation at the wavelength of 300 nm to 400 nm) can activate fracture-recombination of dynamic covalent bonds such as disulfide bonds and borate bonds, molecular chains are promoted to be crosslinked again, and the microstructure of the light-emitting layer is repaired.

The invention belongs to the field of battery materials, and discloses a porous carbon material prepared through in-situ crosslinking-curvature induction and a method and application thereof, and the preparation method specifically comprises the following steps: mixing biomass powder with a solution containing acrylate groups, carrying out a hydrothermal reaction to obtain a carbon nanodot suspension, and carrying out rotary evaporation to obtain carbon nanodot powder; performing ultraviolet irradiation on the carbon nanodot powder; dispersing the irradiated carbon nanodot powder in a solvent to form a suspension, placing the suspension in an external field device for curvature induction, and separating, cleaning and drying the induced carbon nanodots to obtain a porous carbon precursor; calcining the porous carbon precursor, and then pickling and drying to obtain the porous carbon material. The porous carbon material has a snake-like squamous structure, the unique structure provides a buffer space for volume expansion of silicon particles in the charging process, stress can be effectively dispersed, mechanical damage caused by volume expansion is reduced, and the cycling stability of the material is improved.

The application discloses a dispersion type light atomization device suitable for deep removal of perfluorinated compounds in tail water of a sewage plant and a use method, and the device comprises a reactor main body, an ultraviolet lamp group and an external system. The inner wall of the reactor main body is an aluminum film mirror surface with a protective layer; the top is provided with a rotary three-nozzle atomization nozzle; the top is provided with an air outlet pipe; the side of the main body is provided with an air inlet; the bottom is provided with a water tank, and the water tank is provided with a condensing system and a water outlet pipe below. The ultraviolet lamp group has two groups of upper and lower lamps, each group has three lamp tubes with a main wavelength of 185 nm and three lamp tubes with a main wavelength of 254 nm, and the lamp tubes are distributed at intervals, and an air stirrer is located on both sides of the lamp tubes; the two groups of lamp tubes are provided with a funnel-shaped reflection buffer. The external system has an atomization system and an air system. The application utilizes atomization and ultraviolet irradiation to manufacture a micro-ozone environment, so that the flow state operation is used to improve the ozone yield and the mass transfer efficiency of the ozone, the ozone manufacturing cost is reduced, the utilization rate of the ozone is improved, the removal rate of the perfluorinated compounds is enhanced, and the device has the advantages of small occupation area and convenient use.

The application relates to a kind of axial flux motor stator impregnation rapid setting method, device and equipment, including the surface of stator end portion is divided into a plurality of solidification micro area according to the three-dimensional grid model data of stator end portion;Multi-objective optimization model is constructed, and the multi-objective optimization model is with the ultraviolet irradiation intensity, irradiation time and thermal catalytic temperature of each solidification micro area as decision variable, with surface curing time, resin temperature rise peak value and total energy consumption of irradiation as optimization goal, obtain pareto optimal solution set, each pareto optimal solution corresponds a group of the ultraviolet irradiation intensity, irradiation time and thermal catalytic temperature of multiple solidification micro area;From pareto optimal solution set, select the solution with the shortest surface curing time as target solution;According to the ultraviolet irradiation intensity, irradiation time and thermal catalytic temperature of multiple solidification micro area corresponding to target solution, control ultraviolet lamp array to carry out partition scanning irradiation to stator end portion, and control infrared heater to carry out partition heating to stator end portion.

1. The name of the design product: ultraviolet irradiation device. 2. The use of the design product: used for curing and surface treatment of products by ultraviolet light. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view. 5. The top view of design 1 has been shown in the perspective view of design 1, and the top view of design 2 has been shown in the perspective view of design 2, so the top view of design 1 is omitted; the top view of design 2 is omitted. 6. Design 1 is designated as the basic design. 7. Other circumstances that need to be explained Other explanations: mark A, B part as transparent material.

The present invention discloses a method for controlling the surface potential of an insulating material under high vacuum, which uses an ultraviolet light source to irradiate an insulating material sample to generate radiation-induced conductivity, and discharges the charge by discharging the charge to the ground. In the present invention, an ultraviolet light source is used to irradiate an insulating material sample to generate radiation-induced conductivity, and discharges the charge by discharging the charge to the ground, which can effectively eliminate the surface potential formed by the accumulated charge on the surface of the insulating material sample, without the need to additionally equip expensive equipment such as electron guns and ion sources, thereby reducing the cost of potential control, eliminating complex external circuit design, and increasing test reliability; ultraviolet irradiation is used to achieve surface potential control of the insulating material under high vacuum conditions, and the surface potential neutralization operation can be completed without contacting the sample surface, thereby avoiding damaging the sample surface morphology and thus affecting its secondary electron emission characteristics, increasing test stability, and improving the accuracy of secondary electron emission coefficient measurement.

The disinfection device comprises an I-shaped base, pulleys are fixedly installed at the lower ends, close to the four corners, of the I-shaped base, the upper end of the I-shaped base is fixedly connected with a fixing pile and a control console, a storage open groove is formed in the left side wall of the fixing pile, and the left side wall of the storage open groove is fixedly connected with the I-shaped base. A hydraulic cylinder is rotationally connected to the right side wall of the storage open groove. The movable seat is driven by the hydraulic cylinder to move and adjust along the U-shaped material carrying seat, the ultraviolet lamp tube is conveniently stored in the U-shaped material carrying seat, the U-shaped material carrying seat is rotated into the storage open groove, medical staff do not need to manually adjust the ultraviolet lamp tube for storage, time and labor are saved, operation is convenient, and the working efficiency is improved. The disinfection liquid in the liquid storage tank is guided into the atomization spray head through the first liquid guide pipe, the second liquid guide pipe, the hose connector and the liquid drainage hose by means of the booster pump, atomization disinfection is matched with ultraviolet disinfection, the disinfection effect is improved, and the environmental requirements of the intensive care unit are met.

To provide an explosion-proof type insect trap having a simple structure.SOLUTION: An explosion-proof type insect trap includes: an irradiation part having an ultraviolet irradiation surface; a guard part arranged so as to face the ultraviolet irradiation surface; and an insect trapping part attached to the guard part and arranged in a second region excluding a first region corresponding to the ultraviolet irradiation surface of the guard part.SELECTED DRAWING: Figure 1

The invention relates to a preparation method of a doped and grafted polypropylene-based composite film and the film thereof, and the method comprises the following steps: preparing a single-layer boron nitride nanosheet; preparing an ultraviolet radiation grafting modified polypropylene film; the doped and grafted polypropylene-based composite film is prepared based on the single-layer boron nitride nanosheet and the ultraviolet radiation grafting modified polypropylene film, and the composite film has high dielectric constant and high breakdown field strength, so that the energy storage density of the material is improved.

The invention discloses an ultrasonic-assisted photocatalytic precious metal leaching method, and belongs to the technical field of precious metal recovery. The method comprises the following steps: (1) material pretreatment: treating electronic waste powder containing gold, silver and copper into electronic waste powder capable of being leached by a proper method; (2) preparing a reaction system: adding electronic waste powder containing gold, silver and copper into a leaching solvent, then sequentially adding FeCl3 and a photocatalyst, and uniformly stirring; (3) photocatalytic leaching: carrying out ultrasonic-assisted leaching reaction on the suspension reaction system under ultraviolet irradiation; and (4) solid-liquid separation is conducted, and leaching liquid containing precious metal and leaching residues are obtained. According to the method, the synergistic effect of FeCl3 and the photocatalyst is combined, efficient leaching of precious metal is achieved under ultraviolet irradiation, and the method has the advantages of being environmentally friendly, efficient, good in cyclicity, mild in condition, easy to operate and the like, is suitable for large-scale recovery of precious metal from electronic waste containing gold, silver and copper and has important economic and environmental significance.