102results about How to "Widely distributed" patented technology

The invention provides a preparation method of an acid-resistant and chlorine-corrosion-resistant porous composite electrode and a device constructed on the basis of the electrode and used for preparing hydrogen and chlorine by electrolyzing a sodium chloride solution, two cavities are provided, an acid or neutral saturated sodium chloride solution is filled in the cavities, the cavities are separated by a proton exchange membrane or a diaphragm, and the proton exchange membrane or the diaphragm is filled in the cavities. And in the electrolysis process, the cathode generates high-purity hydrogen, the anode generates high-purity chlorine, the chlorine is absorbed by sodium hydroxide in the gas collection bottle and generates sodium hypochlorite, or the chlorine is introduced into a sodium bromide / sodium iodide solution to replace bromine / iodine elementary substances, and the chlorine is discharged from the gas collection bottle. The sodium hypochlorite solution and the bromine / iodine water are used for disinfection and sterilization experiments. The corrosion-resistant porous composite electrode for electrolysis of an acidic or neutral saturated sodium chloride solution is prepared, the electrolysis voltage of the corrosion-resistant porous composite electrode is further reduced by loading a cathode / anode catalyst, and an acidic or neutral saturated sodium chloride solution electrolysis device constructed based on the electrode can be used for preparing high-purity hydrogen and chlorine.

The invention discloses an in-situ injectable bone repair adhesive material with a double-sequence osteogenesis promoting function as well as a preparation method and application of the in-situ injectable bone repair adhesive material. The preparation method comprises the following steps: 1) sequentially carrying out dual chemical grafting modification on hyaluronic acid by using methacrylic anhydride and dopamine hydrochloride to obtain a DA-HAMA biomacromolecule with UV curing and adhesion functions; (2) preparing a Ca < 2 + > physical cross-linked sodium alginate microsphere material loaded with an osteogenesis promoting drug by using a micro-fluidic system; and (3) preparing a DA-HAMA solution under dark and heating conditions, adding the vascular promoting factors and the drug-loaded microspheres when the DA-HAMA solution is cooled to room temperature, uniformly mixing, and carrying out centrifugal defoaming and irradiation sterilization to obtain the in-situ injectable bone repair adhesive material. The bone repair adhesive material has the functions of being degradable, injectable, capable of being adhered in a wet state, promoting blood vessels and promoting bone formation, and a brand new strategy is provided for bone defect repair.

The invention provides a smart city traffic information system based on a 5G network, and relates to the technical field of data processing, and the system comprises a digital traffic processing module which is used for collecting and analyzing the operation data of various traffic facilities and vehicles in real time so as to recognize a traffic flow mode, predict a traffic state, obtain an analysis result, and according to the analysis result, determine the traffic flow mode; traffic signals are automatically adjusted, and traffic flow is optimized; and the digital government affair cooperation module is used for automatically acquiring and distributing update information of traffic policies and laws and regulations, automatically processing traffic violation behaviors, and collecting and analyzing feedback information of the public for the traffic policies to obtain an analysis report. According to the system, a plurality of digital modules are integrated, real-time collection, intelligent analysis and efficient management of traffic information are realized, the traffic operation efficiency and safety are improved, the public participation degree and satisfaction degree are enhanced, and intelligent, collaborative and sustainable development of urban traffic is effectively promoted.

The invention relates to the technical field of agricultural fertilizers, and particularly discloses a magnesium aluminum silicate mineral derived layered magnesium aluminum bimetallic oxide-silicon oxide composite material as well as a preparation method and application of the magnesium aluminum silicate mineral derived layered magnesium aluminum bimetallic oxide-silicon oxide composite material. Magnesium / aluminosilicate minerals are successfully converted into the layered magnesium-aluminum bimetal oxide-silicon oxide composite material with a high specific surface area and a developed pore structure, and the layered magnesium-aluminum bimetal oxide-silicon oxide composite material is combined with nutrients through a simple and convenient fertilizer preparation process to prepare the slow-release fertilizer. The slow-release fertilizer has the advantages of cheap and easily available raw materials, simple and efficient preparation process, stable slow-release performance, soil improvement effect and the like, and provides an efficient and environment-friendly new way for development of the slow-release fertilizer; the method has important significance for promoting sustainable agricultural development and realizing high-value utilization of silicate minerals in the agricultural field.

The invention relates to the technical field of basalt concrete, in particular to basalt ultra-high performance concrete and a preparation method thereof, the preparation method comprises a raw material screening method and a preparation method, and the raw material screening comprises the steps of (1) selecting ultra-high performance concrete water, (2) selecting a cementing material, (3) selecting aggregate and (4) selecting fiber. The preparation method comprises the following steps: (1) the use amount of water should meet the design specification of the ultra-high performance concrete, and the water-binder ratio should be controlled within 0.25; and (2) according to the particle sizes of the cementing material and the sand, the dosage of each component is calculated on the basis of the closest packing theory, and the sand-cement ratio is controlled within 1.1-1.4. By adopting the method, in-situ utilization of the raw materials of the ultra-high-performance concrete can be realized in volcanic diagenetic regions, and design, preparation and application of the basalt ultra-high-performance concrete can be realized in practical engineering.

The invention, which belongs to the technical field of cable fault detection, discloses a detection apparatus and method for a cable fracture position in an expressway, the detection apparatus comprises an audio oscillator, a buffer, a high-pass filter, an output amplifier, a detector, an earphone, a data processing module and a user interface, the audio oscillator, the buffer, the high-pass filter and the output amplifier are sequentially connected, the input ends of the detector and the earphone are respectively connected with the output amplifier, the output ends of the detector and the earphone are both connected with the data processing module, and the data processing module is connected with the user interface. According to the device for detecting the fracture position of the cable in the expressway, a detection signal is applied to the exterior of the cable, so that damage to an insulating layer of the cable by a traditional method is avoided, and non-contact detection is realized.

The invention relates to the technical field of pressure-sensitive adhesives, in particular to a preparation method of a UV (ultraviolet) viscosity-reducing adhesive tape, which comprises the following steps: taking 100g of polymer, adding 10-80g of ethyl acetate, an isocyanate curing agent and a photoinitiator, then uniformly stirring, standing and defoaming to obtain an adhesive, uniformly coating a PET (polyethylene terephthalate) release film with the standing adhesive, putting into a drying oven to bake and dry, then attaching to a PO (polyolefin) base film, and drying to obtain the UV viscosity-reducing adhesive tape. And putting the adhesive tape process product into an aging room, and placing the adhesive tape process product at normal temperature for 7 days to obtain the UV viscosity-reducing adhesive tape of the PO base material. The UV viscosity-reducing adhesive tape disclosed by the invention can realize the performance that a common UV viscosity-reducing adhesive tape cannot be balanced in a severe environment, has the general characteristics of high adhesive force at an initial stage and extremely low adhesive force after UV treatment in the aspect of performance, can resist strong acid corrosion before UV treatment, can be applied to acid etching protection of glass, can be subjected to viscosity-reducing stripping through UV irradiation after an etching process is completed, and is low in adhesive force and high in adhesive force. And automatic operation is easy, and no adhesive residue risk exists.

The invention belongs to the technical field of electro-catalysis, and discloses a red mud pretreatment method and application thereof.The red mud pretreatment method comprises the steps that industrial waste red mud generated in the aluminum smelting industry is recycled, subjected to high-speed centrifugation, washed to be neutral in a graded mode, filtered, dried and ground into powder, and a working electrode is prepared; through a pre-reduction step, a certain potential is applied to carry out electrochemical in-situ reconstruction on a working electrode. The surface part Fe < 3 + > is reconstructed into high-activity Fe < 0 > through a pre-reduction step. The red mud is used as the electrocatalyst to be applied to the nitrate reduction reaction, the catalytic performance is good, the ammonia production performance is excellent, and meanwhile the method can be applied to treatment of industrial flue gas and industrial wastewater.

The invention discloses a sponge-sourced pyridine inner salt. The chemical structure of the sponge-sourced pyridine inner salt is shown as a formula I: # imgabs0 #, and the sponge-sourced pyridine inner salt is sourced from Hippospongia lachne in South China Sea. The sponge-sourced pyridine inner salt disclosed by the invention is simple in preparation method, and medicine source materials are widely distributed in South China Sea and are easy to collect. The invention provides a new compound for marine drug research, and provides a scientific basis for development and utilization of marine medicinal resources in China.

The invention discloses a lacidipine film-controlled sustained-release pellet capsule and a preparation method thereof, relates to the technical field of medicines, and aims to solve the problem of release reduction caused by film aging of a lacidipine film-controlled sustained-release pellet prepared by an aqueous dispersion coating. The preparation method comprises the following steps: respectively weighing a lacidipine bulk drug, a polymer carrier material and a plasticizer according to a prescription amount, grinding and uniformly mixing to prepare the lacidipine solid dispersion. A sustained-release coating film of the pellet capsule contains Eurdragit RL30D, a plasticizer triethyl citrate and an anti-sticking agent talcum powder, and a pellet core contains croscarmellose sodium and an excipient. According to the lacidipine solid dispersion solid preparation provided by the invention, lacidipine exists in the carrier material in a microcrystalline state, an amorphous state, a colloidal dispersion state or a molecular dispersion state, so that the lacidipine solid dispersion solid preparation has high dispersity, the dissolution speed of a medicine is accelerated, the absorption of the medicine can be promoted, and the bioavailability is improved.

The invention relates to the technical field of material scattering structures, in particular to a vertical cement raw material mill material spraying and scattering device which comprises a material supply pipe, a first disc and a second disc, the first disc and the second disc are distributed up and down and are coaxially arranged, and the space between the first disc and the second disc is set as a material uniformizing space. The feeding pipe is vertically installed at the top of the first disc and used for feeding materials into the material uniformizing space, a baffle ring is arranged at the edge position of the second disc, and the first disc makes contact with the baffle ring; by designing a second disc to rotate and outwards diffuse raw materials and combining annular distribution of a plurality of material scattering long groove plates, the raw materials are not only uniformly scattered in the circumferential direction, but also more widely distributed in the radial direction, the distribution uniformity of the raw materials in the raw material mill is greatly improved by adopting a planar falling mode, and the raw materials are uniformly dispersed in the raw material mill. And the grinding quality and efficiency can be improved.

The invention discloses a high-nickel large-particle precursor as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The preparation method of the precursor comprises the following steps: adding a metal salt solution, a precipitator solution and a complexing agent solution into a first reaction container with a base solution in a parallel flow manner, and carrying out a first co-precipitation reaction under a stirring condition until a preset particle size is reached, so as to obtain first slurry; transferring the first slurry into a second reaction container, simultaneously adding a metal salt solution, a precipitator solution, an additive solution and a complexing agent solution in a parallel flow manner, and carrying out a second coprecipitation reaction under a stirring condition to obtain second slurry; and concentrating the second slurry until the material grows to the target particle size, and aging. The preparation method is simple, can produce the high-nickel ternary large-particle precursor with high secondary particle sphericity degree, relatively wide distribution and mixed large and small particles, and is beneficial to solving the hidden dangers of the high-nickel ternary lithium battery in the aspects of performance and safety caused by secondary particle cracking of the high-nickel ternary precursor.

The invention discloses a movable building construction waste treatment device which comprises a frame, rollers are rotatably mounted on the lower surface of the frame, a brake mechanism is rotatably mounted on one side of the frame, a first U-shaped frame and a second U-shaped frame are fixedly mounted on the two sides of the frame respectively, and a dust collection mechanism is fixedly mounted in the first U-shaped frame; the dust collection end of the dust collection mechanism is installed on the upper surface of the crushing bin, and a feeding mechanism is rotationally installed in the second U-shaped frame. Through the design of the dust collection mechanism and the feeding mechanism, the dust collection mechanism pushes or pulls the vehicle frame to a construction waste accumulation position, so that the equipment can quickly reach a waste generation place, the carrying distance of the construction waste can be reduced through the flexible moving mode, the treatment efficiency is improved, and through the folding design of the feeding mechanism, the construction waste can be conveniently and rapidly transported. In the construction waste treatment process at different places, the construction waste treatment device can be quickly converted from a transportation state to a working state through the folding and unfolding functions.

This invention belongs to the field of medical device technology and discloses a foot pressure relief device for diabetic foot. It includes a base, a pressure relief plate and a motor connected to the base, and a foot pedal and a transmission assembly connected to the pressure relief plate. The transmission assembly includes a crank, a first connecting rod, and a sliding seat. The crank is fixedly connected to the output shaft of the motor, and the sliding seat is connected to the pressure relief plate. The two ends of the first connecting rod are respectively connected to the crank and the sliding seat. The sliding seat is connected to a foot rolling shaft and a second connecting rod, and the second connecting rod is connected to a foot massage roller. A buffer spring is provided between the pressure relief plate and the base. The foot pedal has a through groove, and the foot rolling shaft is connected to a foot massage roller. This invention utilizes the foot rolling shaft / foot massage roller and the foot massage roller to simultaneously perform rolling massage on the sole and instep of the foot. The periodic oscillation of the pressure relief plate causes the heel and toes to alternately rise, resulting in good pressure relief for the foot.

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The invention belongs to the technical field of sodium-ion battery positive electrode materials, and particularly discloses a preparation method and application of a sodium-ion battery positive electrode material sodium ferric borate, and the preparation method comprises the following steps: (1) preparation of a precursor solution or suspension: respectively adding a boron source, a sodium source and a ferric iron source into water, and uniformly stirring; sequentially adding into a carbon source aqueous solution, and continuously stirring to obtain a mixed solution; stirring and carrying out a coprecipitation reaction to obtain a precipitate; (2) preparing a ferric sodium borate precursor: drying the precipitate obtained in the step (1) to obtain the ferric sodium borate precursor; and (3) preparing the ferric sodium borate: pre-treating and calcining the ferric sodium borate precursor obtained in the step (2) under the protection of inert atmosphere to obtain the sodium ion battery positive electrode material ferric sodium borate. The positive electrode material prepared by the invention belongs to a sodium-rich phase material, and has excellent air stability, which is very beneficial to subsequent processing and application in batteries.

The invention provides high-light-transmittance polymethyl methacrylate resin and a preparation method thereof, and belongs to the technical field of high polymer materials. Comprising the following steps: carrying out catalytic cracking on waste polymethyl methacrylate resin, collecting a high-purity methyl methacrylate regenerated monomer I, uniformly mixing the high-purity methyl methacrylate regenerated monomer I with a methyl methacrylate monomer II, a comonomer III, a modifier, an initiator and a chain transfer agent serving as raw materials, and sequentially carrying out primary polymerization, secondary polymerization and tertiary polymerization, so as to obtain the polymethyl methacrylate copolymer. And then inputting the materials into a devolatilization extruder for devolatilization, extrusion molding and granulation to prepare the high-light-transmittance methyl methacrylate resin. The prepared light-transmittance polymethyl methacrylate resin is high in light transmittance, good in toughness and excellent in mechanical property, the application of the light-transmittance polymethyl methacrylate resin is greatly widened, and the light-transmittance polymethyl methacrylate resin has a wide application prospect.

The invention relates to the technical field of biological gene detection, and particularly discloses a miniature pig SNP (Single Nucleotide Polymorphism) molecular marker combination and application thereof. The miniature pig SNP molecular marker combination disclosed by the invention comprises at least one of 221 SNP molecular markers, the physical positions of the 221 SNP molecular markers are determined by performing sequence alignment on whole genome sequencing with the coverage rate of 10 * on the basis of miniature pigs, and the site information of the 221 SNP molecular markers is shown in a table 1. The miniature pig SNP molecular marker combination provided by the invention is used for detecting the SNP genotyping of miniature pigs, and has the properties of novelty, stability, economy and high efficiency.

A catalyst for the direct synthesis of acetic acid and ethanol from CO2 via a non-hydrogenation route, its preparation method, and its application are disclosed. This invention belongs to the field of catalyst technology and overcomes the shortcomings of existing acetic acid synthesis technologies. The solution involves using TiO2 nanotubes as the catalyst support, and the active component being a single metal Co or Pd, or a bimetallic composition of Co and Pd, with a loading of 3-7%. wt The catalyst is prepared by first using a hydrothermal method to prepare TiO2 nanotubes, and then using the TiO2 nanotubes as a carrier, impregnating, drying, and calcining to obtain the catalyst. When applied to a dual-channel fixed-bed step-by-step continuous reactor, the catalyst enables the one-step conversion of CO2 to ethanol and acetic acid via a non-hydrogenation route at low temperature and atmospheric pressure, avoiding the problem of insufficient hydrogen source in the CO2 hydrogenation route. The process of this invention is short, the conditions are mild, it does not require a high-energy-consuming syngas production step, the product composition is simple, and the subsequent separation energy consumption is low.

The invention relates to the technical field of biology, in particular to an SNP (Single Nucleotide Polymorphism) molecular marker related to soybean mosaic virus resistance, an amplification primer and application of the SNP molecular marker in soybean breeding. The SNP molecular marker is located at the 910489bp site of a No.7 chromosome of a soybean genome, and the polymorphism of the SNP molecular marker is C / A. The invention provides application of the SNP molecular marker related to the soybean mosaic virus resistance in identification or auxiliary identification of the soybean mosaic virus resistance. By providing the accurate, simple, convenient and low-cost SNP molecular marker and the detection method thereof, early-stage, rapid and efficient molecular-assisted selection of soybean mosaic virus resistance characters is realized, so that the breeding process of a new variety of disease-resistant soybeans can be remarkably accelerated, and the SNP molecular marker has important breeding application value.

The embodiment of the invention relates to the technical field of federated learning and information security, in particular to a federated multi-target scheduling method and system for industrial control crowdsourcing testing, which is characterized in that sensitive data such as ability, experience and the like of a tester are only reserved at a local terminal by constructing a framework combining local feature coding and federated model training, so that the test efficiency is improved, and the test efficiency is improved. Outward transmission is not carried out; only the model update quantity after the privacy enhancement processing such as gradient cutting and differential privacy noise injection is uploaded to the federated matching learning server, and only the model update quantity after the privacy enhancement processing is uploaded to the federated learning server, so that the leakage risk of concentrated data storage is avoided from the source, the requirements of privacy regulations such as GDPR and the like are completely met, and the reliability of the system is improved. Compared with traditional privacy technologies such as homomorphic encryption, the method has the advantages that the calculation and communication overhead is greatly reduced, the design of local matching degree calculation is matched, the task matching response speed is greatly increased, and the real-time requirement of industrial control system testing is met.

The present invention discloses an air purification module, an air conditioner indoor unit and an air conditioner, wherein the air purification module comprises a housing and a rotating body, the housing has an air inlet, an air outlet, and a purification air duct connecting the air inlet and the air outlet; the rotating body comprises a bracket and a screen detachably mounted on the bracket, the rotating body is rotatably arranged in the purification air duct, and the rotating body is suitable for, when water is sprayed onto the screen, to throw the water outward by rotating. The air purification module of the present invention improves the purification effect while achieving freshness of the filtered air, and the screen can be replaced according to different usage requirements.

This invention discloses an alloy catalyst, comprising a support and a copper-ruthenium alloy supported on the support, wherein the copper-ruthenium alloy is: Cu 0.7 Ru 0.3 The alloy catalyst prepared by this invention can be used to prepare cyclopentanone. The catalyst has high activity, good stability, and low price. The reactants used in the reaction are renewable, widely distributed, and inexpensive. The preparation of cyclopentanone using the catalyst of this invention does not require the introduction of acid or alkali, which solves the problem of difficult acid treatment in the prior art. Furthermore, it is not corrosive to the reaction equipment, which is conducive to large-scale production.

The invention relates to the technical field of tire manufacturing, in particular to application of micro-nano reclaimed rubber in preparation of solid tire core rubber or solid tire crown rubber. Compared with solid tire crown rubber and solid tire core rubber prepared by using a traditional tire reclaimed rubber technology, the micro-nano reclaimed rubber is introduced into the solid tire crown rubber or solid tire core rubber formula, so that the Mooney viscosity of the solid tire crown rubber and the solid tire core rubber is remarkably reduced; meanwhile, the energy consumption caused by the use of TRR in the preparation process is also effectively reduced, the environmental pollution is greatly reduced, and particularly, the generation of wastewater is remarkably reduced.

This utility model discloses a road dust suppression spraying device, belonging to the field of road management technology, which solves the problems of poor dust suppression effect and high water cost on existing roads. The spraying device includes a double-arm lamp post, with symmetrically arranged mounting rods on both sides of the upper end of the lamp post. A water delivery pipe is provided on one side of the lamp post, and a spray pipe connected to the upper end of the water delivery pipe is provided on the mounting rod. The spray pipe is equipped with multiple multi-head low-pressure atomizing nozzles with different spray angles. The lower end of the water delivery pipe is connected to a main water supply pipe, which is connected to a water supply pump station. A control component for controlling the opening and closing of the pipeline is provided between the water delivery pipe and the main water supply pipe, and the control component is electrically connected to an environmental monitoring station. This utility model's road dust suppression spraying device effectively improves the dust suppression effect, solves the problems of small operating area and large water droplets caused by fog cannons, and has the characteristics of wide applicability and strong practicality.

The invention discloses an air defense warning device appearance inspection method based on an unmanned aerial vehicle, and the method comprises the following steps: carrying out the inspection of a region map established by a target, and generating a preset inspection path; the unmanned aerial vehicle unit shoots images and videos of the target alarm according to the inspection route; acquiring the shot image or video data through an image acquisition module included in the inspection system unit, inputting the shot image or video data into a pre-trained intelligent analysis module, and judging whether a target inspection alarm is in a recognizable state or not; generating an inspection report of the target inspection alarm through the inspection system unit according to the inspection result of the target inspection alarm checked by a machine or manually; and the unmanned aerial vehicle unit sequentially completes inspection tasks of the target alarms in the regional map according to the inspection route. By adopting the technical scheme, the device is suitable for an operation environment with multiple target air defense warning devices, wide distribution and staggered arrangement, the patrol processing time of the air defense warning devices can be shortened, and manpower is saved.

The utility model discloses a forest odontotermes formosanus trapper, and relates to the technical field of termite trapping devices. The device comprises a stand column, the stand column is made of wood, and the lower end of the stand column can be fixed underground; the upper end of the stand column is wrapped with the imitated bark bait wrapping layer; the bait net is arranged on the outer side of the bark-imitating bait wrapping layer in a sleeving mode so as to fix the bark-imitating bait wrapping layer. The utility model discloses and provides a forest odontotermes formosanus trapper which is used for luring odontotermes formosanus by simulating the shape of a tree so as to monitor odontotermes formosanus. In addition, the termite killing agent can be infiltrated on the bark-imitated bait wrapping layer so as to kill odontotermes formosanus. According to the characteristic of wide distribution of odontotermes formosanus in the forest, the device has the advantages of being low in cost and easy and convenient to operate.

The application relates to the technical field of industrial waste gas purification, and discloses an activated carbon adsorption industrial volatile gas purification equipment, which comprises an industrial volatile gas purification cabinet, a partition plate is fixedly installed in the industrial volatile gas purification cabinet, a waste gas inlet pipe located below the partition plate is fixedly communicated with the left side of the industrial volatile gas purification cabinet, two volatile gas purification treatment boxes located above the partition plate are fixedly installed in the industrial volatile gas purification cabinet, and the sides, away from each other, of the two volatile gas purification treatment boxes both extend to the outside of the industrial volatile gas purification cabinet. The application has the following advantages and effects: the two volatile gas purification treatment boxes are alternately used to comprehensively and efficiently adsorb and purify volatile gas in industrial waste gas, the activated carbon particles in the volatile gas purification treatment boxes can be replaced without stopping the machine, the work efficiency is improved, and the continuity of industrial production and waste gas purification treatment is ensured.

The invention relates to the field of lead-free soldering lugs, and particularly discloses an SAC-series lead-free soldering lug and a preparation method thereof. The SAC series lead-free soldering lug is prepared from the following raw materials in parts by mass: 20 to 40 parts of SAC305, 60 to 80 parts of micro-nano copper powder and 1 to 5 parts of Ag3Sn nanoparticles. According to the SAC-series lead-free soldering lug, the micro-nano copper powder and the Ag3Sn nanoparticles are added, and under the synergistic effect of the micro-nano copper powder and the Ag3Sn nanoparticles, the reliability of welding spots and the mechanical performance of the soldering lug are improved.

The invention discloses a ferric sodium pyrophosphate composite positive electrode material and a preparation method and application thereof. The composite positive electrode material is composed of ferric sodium phosphate pyrophosphate and carbon, the surface of the ferric sodium phosphate pyrophosphate is coated with the carbon, the molar ratio of sodium to iron to phosphorus is 4: (3-y): 4, y is larger than 0 and smaller than or equal to 0.5, the carbon content is 1-10 wt%, and the composite positive electrode material does not contain associated phases. The preparation method comprises the following steps: adding water into an iron source, a sodium source, a phosphorus source and a carbon source to prepare a mixed solution, and drying to obtain precursor powder; sintering under the protection of inert gas to form a semi-finished body, carrying out ball milling or sand milling on the semi-finished body, and then carrying out spray drying; and finally sintering under the protection of argon or nitrogen to obtain a finished product. The raw materials are cheap and easy to obtain, process parameters are accurately controlled through a two-step heat treatment method, the compaction degree and the compaction degree of the material are remarkably improved, the electrochemical performance is optimized, and the preparation method has important application value in the field of sodium ion secondary batteries.