38 results about "Barium nitrate" patented technology

The invention relates to a controllable electrochemical etching strategy based on solubility product difference, in particular to a preparation method of a barium sulfate modified NiCo-LDH aqueous alkaline zinc battery positive electrode material, which comprises the following steps: firstly, dissolving 1, 4-phthalic acid and sodium hydroxide in a molar ratio of 1: 2 in water to obtain a solution A; dissolving barium nitrate pentahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and ammonium fluoride in water according to a molar ratio of (0-1.5): 1: 4: 10 to obtain a solution B; the preparation method comprises the following steps: fully mixing the solutions, transferring the mixed solution into an autoclave containing foamed nickel (NF), and carrying out solvothermal reaction to obtain a tri-metal Co / Ni / Ba-MOF precursor (CNBx-BDC); cNBx-BDC is used as a working electrode, a platinum wire is used as a counter electrode, Hg / HgO is used as a reference electrode, 5-6M potassium hydroxide and 0.05-0.06 M sodium sulfate are used as electrolyte, a three-electrode system and a cyclic voltammetry method are adopted, electrochemical etching is carried out at the scanning rate of 20-30mV s <-1 > under the voltage range of 0-0.5 V, and the barium sulfate nanodot functionalized Co / Ni / Ba-LDH electrode (BS (at) CN-LDH) is obtained after six times of circulation. The unique porous structure can provide more electrochemical active sites and enhance electrolyte infiltration capacity, and the constructed heterostructure forms a strong built-in electric field, accelerates charge transfer, reduces ion diffusion energy barriers and improves energy utilization efficiency.

The invention discloses a novel antibacterial environment-friendly ceramic and a preparation method thereof, and belongs to the technical field of ceramics, the method comprises the following steps: dissolving aluminum chloride, barium nitrate and ferric nitrate in a solvent, and stirring and mixing to prepare a first mixed solution; adding kaolin and carbon powder into the first mixed solution, and stirring and mixing to obtain a second mixed solution; boron, carbon, aluminum, boron oxide, zirconium dioxide and barium carbonate are dispersed in a dispersing agent to be mixed to prepare a third mixed solution; boron oxide, aluminum hydroxide, titanium boride, zirconium, silicon, sodium zirconate, sodium carbonate, calcium tungstate and zirconium dioxide are added into the second mixed solution to be stirred and mixed, and mixed slurry is prepared; the mixed slurry is used for preparing a blank body, the blank body is placed in a sintering furnace to be sintered in different temperature stages and sintering environments, and the prepared ceramic has high strength, is not prone to cracks in the environment where the temperature changes rapidly and is good in corrosion resistance.

The invention provides a preparation method for synthesizing lithium sulfide from industrial-grade lithium hydroxide and sodium sulfide, a preparation method for a solid electrolyte and a solid-state battery, and the preparation method for synthesizing lithium sulfide from industrial-grade lithium hydroxide and sodium sulfide comprises the following steps: dissolving an industrial-grade lithium hydroxide raw material, and sequentially carrying out oxidation, filtration, washing and drying to obtain lithium sulfide; sodium sulfide and a flocculating agent are added for precipitation and filtration, then sodium carbonate and barium nitrate are sequentially added for impurity removal and filtration, and a lithium hydroxide purified solution is obtained; reacting the sodium sulfide solid with dilute sulphuric acid to obtain hydrogen sulfide gas; hydrogen sulfide gas is introduced into the lithium hydroxide purification liquid for a reaction, and lithium sulfide slurry is obtained; evaporating, concentrating and crystallizing the lithium sulfide slurry, and centrifugally separating; and carrying out vacuum calcination on the crystal, and crushing to obtain lithium sulfide powder. Through oxidative conversion, chemical precipitation and crystallization purification, efficient and deep removal of impurities is realized, the problems that raw material components are complex and difficult to separate are solved, and the purity of lithium sulfide is improved.

The invention relates to a preparation method of a battery and the battery. The preparation method of the battery comprises the following steps: preparing a battery cathode based on barium nitrate, cobalt nitrate hexahydrate, ferric nitrate nonahydrate, zirconyl nitrate and yttrium nitrate hexahydrate; preparing a battery electrolyte based on barium nitrate, zirconyl nitrate, cerium nitrate hexahydrate, yttrium nitrate hexahydrate and ytterbium nitrate hexahydrate; preparing a battery positive electrode based on aluminum powder, iron powder, cobalt powder, nickel powder, chromium powder and molybdenum powder; a battery is prepared based on a battery cathode, a battery cathode, and a battery electrolyte.

The application discloses a method for preparing a monatomic mercury catalyst by using a waste mercury catalyst as a raw material and a product thereof. The method comprises the following steps: mixing the waste mercury catalyst with a mercury chloride gasification aid, and then heating to 300-350 DEG C in an inert gas flow to perform catalytic gasification; and using a defective carbon carrier to adsorb and capture mercury chloride in tail gas of the catalytic gasification to obtain the monatomic mercury catalyst. The mercury chloride gasification aid comprises at least one of potassium nitrate, sodium nitrate, barium nitrate, zinc nitrate and cerium nitrate. The application adopts the method of catalytic gasification-defective capture to obtain the high-performance monatomic mercury catalyst in one step by using the waste mercury catalyst as a raw material. Meanwhile, the carbon carrier after catalytic mercury extraction is crushed, bonded and formed into a shape, and catalytic carbonization is performed to obtain a chlorinated defective carbon carrier, which is used as a carrier of the monatomic mercury catalyst again, so that the waste mercury catalyst is fully recycled and utilized.

The present invention relates to glass microbeads, and in particular to a high-refractive-index, large-particle-size glass microbead for road marking and a spheroidization and molding preparation method thereof. The glass microbeads comprise, by weight, 30 to 40 parts of titanium dioxide, 30 to 40 parts of silicon dioxide, 10 to 15 parts of barium nitrate, 10 to 15 parts of zirconium nitrate, 5 to 7 parts of zinc oxide, 3 to 5 parts of boric acid, 3 to 5 parts of calcium fluoride, 5 to 110 parts of Nb2O5, and 5 to 15 parts of La2O3-ZrO2 compound. In the present invention, calcination at 900°C for 12 hours helps to improve the thermal stability and mechanical strength of the glass microbeads, enabling them to be used for a long time in harsh outdoor environments without being easily damaged. At a high temperature of 1300°C and a spray velocity of 75 m / s, the precise intersection of two nozzles in the combustion chamber ensures precise control of the melting and molding processes of the glass microbeads, thereby obtaining high-quality, high-refractive-index glass microbeads. The addition of Nb2O5 and La2O3‑ZrO2 complexes not only improves the refractive index of the glass microspheres but also maintains a high yield.

The invention discloses a display shell capable of generating a yellow smoke effect, which consists of a spherical shell body filled with explosives and effect powder and a paper cup seat loaded with propellant powder, and further comprises an ignition lead and a blasting fuse. According to the display shell provided by the invention, through the three-section synergistic effect of the effect powder, the explosive and the propellant powder, stable generation and high-altitude release of yellow smoke are realized. The effect drug takes 3, 6-diamino-10-methyl acridine hydrochloride as a color development core and is supplemented by a barium nitrate / strontium carbonate composite oxidant system; the explosive triggers the effect explosive to release through a high-heat reaction of aluminum powder-barium nitrate; the propellant ensures that the display shell is accurately lifted off through high-energy output of potassium perchlorate-magnesium aluminum alloy. The three formulas form synergy in three aspects of energy transfer, oxidant complementation and combustion regulation, so that the yellow smoke has the advantages of stable color development, uniform diffusion and long duration.

Provided is a separator used for a secondary battery. The separator may comprises a complex-containing layer which is provided on a surface in contact with a negative electrode of the secondary battery and which contains an electrolyte complex. The electrolyte complex may contain a nitrate and a coordination substance. The nitrate may include at least one selected from lithium nitrate, potassium nitrate, cesium nitrate, sodium nitrate, silver nitrate, calcium nitrate, zinc nitrate, copper nitrate, magnesium nitrate, indium nitrate, aluminum nitrate, ammonium nitrate, barium nitrate, and iron nitrate.

The application belongs to the field of composite materials, and provides a preparation method of a composite material of barium borate as a skeleton loaded with glycerol monostearate, GMS is dispersed in deionized water, heated and stirred, and then cooled to room temperature to form a suspension, barium nitrate and sodium tetraborate are dispersed in deionized water and stirred by a magnetic stirrer; the GMS suspension is added dropwise into the sodium tetraborate solution and stirred uniformly, the barium nitrate solution and the PEG-200 solution are added dropwise into the GMS and sodium tetraborate mixed solution in sequence and stirred uniformly, and then poured into a hydrothermal kettle for hydrothermal treatment; after hydrothermal treatment, the product is naturally cooled to room temperature, centrifuged or suction filtered, and the precipitate is washed with deionized water to obtain a BaB / GMS / PEG composite material. The product has excellent tribological properties. The preparation method of the composite material of barium borate as a skeleton loaded with glycerol monostearate has the advantages of simple synthesis process and green and environmentally-friendly reaction.

The present application relates to a graphite furnace atomizer sulfate shielding pre-device, which comprises a sample inlet tube connected with a sample peristaltic pump at one end for inputting sample, and in parallel with a dilute nitric acid inlet tube and a barium nitrate inlet tube at the other end, respectively supplied by the peristaltic pump. After parallel convergence, the liquid enters a first cyclone mixing chamber to complete the sample mixing and acidification. The liquid enters a second cyclone mixing chamber through the bottom communication pipe and reacts with barium nitrate to generate barium sulfate precipitate. The mixed liquid flows into the collection area through the inverted umbrella-shaped distributor and the rotary reaction generator, and when flowing through the narrow pipeline, the photoelectric sensor monitors the content of the precipitate. After the liquid enters the precipitation area, it is discharged through the discharge valve plate. The three-way electromagnetic valve adjusts the flow direction according to the detection result, and completes the switching of sample inlet or waste liquid delivery. The device has high integration and simple operation, and is suitable for the efficient and accurate requirements of modern analytical chemistry, especially in trace analysis, which can significantly improve the working stability and safety of the graphite furnace atomizer.

The application provides a preparation method of an ErBCO superconducting target material, and belongs to the technical field of oxide target materials. In the application, nitric acid erbium, nitric acid barium, nitric acid copper, high-purity water, a dispersing agent and a binder are sequentially mixed, and then the mixture is subjected to segmented ball milling and spray granulation to obtain a mixed powder. Subsequently, the mixed powder is sequentially subjected to calcination, cold sintering and drying treatment to prepare the ErBCO superconducting target material. The cold sintering process can improve the density and other properties of the target material while reducing the cost, and has the advantages of significantly reducing the ceramic sintering temperature and shortening the sintering time.

The application discloses a kind of light absorption material glass for high-definition ultra-short inverter and preparation method thereof, and the light absorption material glass includes the following weight percentage components: quartz sand 40-50%, boric acid 6-12%, alumina 7-15%, sodium carbonate 1-10%, potassium carbonate 1-10%, lithium carbonate 0-2%, basic magnesium carbonate 0-3%, calcium carbonate 0-5%, barium nitrate 1-3%, zirconium oxide 0-3%, copper oxide 1-3%, potassium permanganate 3-6%, potassium chromate 0.2-1%, diiron trioxide 1-5%, cobalt trioxide 1-6%, nickel oxide 1-6%, vanadium pentoxide 1-6%, cerium oxide 0-1%. The light absorption material glass of the application is used for preparing ultra-short inverter, which can effectively improve the transmittance and resolution of ultra-short inverter.

The present invention discloses a perovskite catalyst with A-site defect precipitation, a preparation method and an application. The chemical formula of the catalyst is Pr x Ba x Sc y Co 1‑y O 3‑δ , where 0.3 < x < 0.5, 0.1 < y < 1, δ is the oxygen vacancy content, and 0 ≤ δ ≤ 1. The preparation method includes: dissolving praseodymium nitrate hexahydrate, barium nitrate, scandium nitrate hexahydrate and cobalt nitrate hexahydrate in deionized water, adding citric acid monohydrate and ethylenediaminetetraacetic acid for reaction, adjusting the pH to 3.00 - 9.00 with an ammonia aqueous solution, heating and stirring to form a gel, drying, grinding and calcining the obtained gel to obtain an A-site defect perovskite material; grinding the A-site defect perovskite material and then performing secondary calcination under the condition of introducing H2 to obtain the perovskite catalyst with A-site defect precipitation. The perovskite catalyst of the present invention has extremely high reaction activity and can be used to activate persulfate to degrade organic pollutants in wastewater.

The application relates to a low-temperature high-rate graphite negative electrode material and a preparation method thereof, and belongs to the technical field of high polymer materials. The low-temperature high-rate graphite negative electrode material comprises, in terms of weight parts, 25-35 parts of graphite, 1-2 parts of molybdenum disulfide, 0.8-1.2 parts of carbon black, 3-5 parts of nano titanium nitride, 3-5 parts of a low-temperature resistant modifier, 1-3 parts of butadiene styrene rubber emulsion, 1-5 parts of deionized water and 15-25 parts of N-methyl pyrrolidone. A compound is obtained by reacting a precursor prepared from lanthanum nitrate hexahydrate, barium nitrate and graphite powder with lithium fluoride, a pre-product is obtained by reacting the hydroxyl group of the compound with a silane hydrolysis product, and finally, the low-temperature resistant modifier is obtained by reacting the amino group of the pre-product with the double bond of a siloxane chain, the internal resistance is reduced, a gradient conductive network is formed, the volume change is buffered, and the rate performance of the negative electrode material is improved. The low-temperature high-rate graphite negative electrode material prepared by the application not only has good low-temperature resistance, but also has excellent high-rate performance and cycle stability.

This invention discloses a method for low-temperature synthesis of tetragonal barium titanate powder and the resulting product. Using an ethanol solution of tetrabutyl titanate and an aqueous solution of barium nitrate as raw materials, a colloidal suspension is formed with a promoting liquid. The reactants are then dispersed under starch gelatinization to obtain a precursor. The precursor is then subjected to low-temperature heat treatment to obtain tetragonal barium titanate powder, thus achieving a simple solid-state method for low-temperature preparation of uniformly sized tetragonal barium titanate powder. The tetragonal barium titanate powder obtained by this invention has uniform grain size and high purity; the preparation method is simple, uses inexpensive raw materials, involves low-temperature synthesis, has a short preparation cycle, and low energy consumption, which is beneficial for large-scale industrial production.

The application discloses a lithium-carbon fluoride battery electrolyte and application, and belongs to the technical field of lithium / carbon fluoride primary batteries. The lithium-carbon fluoride battery electrolyte comprises lithium salt, solvent and NO3 ‑ additive; the solvent comprises high dielectric constant solvent, ether solvent and nitrogen heterocyclic crown ether solvent; the NO3 ‑ additive is at least one of lithium nitrate, copper nitrate, ammonium nitrate, potassium nitrate, sodium nitrate, barium nitrate, zinc nitrate, lead nitrate, nickel nitrate, magnesium nitrate, calcium nitrate, strontium nitrate and cesium nitrate; the NO3 ‑ additive has a mass fraction of 5% to 20%. The high-concentration nitrate additive is introduced to form a protective layer on the surface of the lithium metal negative electrode, thereby inhibiting the side reaction of the lithium metal and the solvent and accelerating the Li + transporting effect, thereby reducing the polarization phenomenon during battery discharging; the nitrogen heterocyclic crown ether can promote the dissolution of the high-concentration nitrate and the lithium fluoride of the positive electrode in the battery discharging process, reduce the polarization of the battery and improve the energy density of the battery.

This application discloses a continuous preparation method and system for nano-barium sulfate based on waste acid resource utilization and internal circulation. It belongs to the interdisciplinary technical field of industrial waste resource utilization and advanced inorganic nanomaterial preparation. It aims to solve the technical bottlenecks of traditional processes for preparing barium sulfate, such as wide particle size distribution, low purity, pollution caused by the formation of soluble barium nitrate from nitrate ions, and low resource utilization. The method uses industrial waste acid containing sulfuric acid and nitric acid and a barium source as raw materials. The two are fed into a dual-channel centrifugal atomizer for atomization, mixing and reaction. The molar ratio of sulfate ions to barium ions is controlled. After separation and washing of the reaction products, most of the acidic washing liquid is recycled for slurry preparation, a small part is bypassed for purification, and CO2 is recovered and recycled. Finally, the product is dried to obtain nano-barium sulfate powder.

This invention discloses a photocurable composite solid electrolyte separator and its preparation method. The photocurable composite solid electrolyte separator includes a base film and a coating on the base film. The coating is obtained by applying a slurry. The raw materials for preparing the slurry include a modified solid electrolyte, a photoinitiator, a crosslinking agent, and a pore-forming agent. The modified solid electrolyte is a solid electrolyte treated with an inorganic nanoparticle precursor. The inorganic nanoparticle precursor is one or a mixture of aluminum isopropoxide, barium nitrate, tetrabutyl titanate, tetraethyl orthosilicate, tetrabutyl zirconate, and zinc acetate. The photoinitiator can initiate a crosslinking reaction under light irradiation to form a three-dimensional network structure, which significantly improves the heat resistance of the separator. The modified solid electrolyte can simultaneously improve the ionic conductivity and heat resistance of the separator, and effectively improve the problem of poor interfacial compatibility of solid electrolytes, ultimately achieving comprehensive optimization of the heat resistance, ion transport performance, and interfacial stability of the lithium battery separator.

The invention relates to a catalyst for synthesizing menthol through catalytic hydrogenation of thymol and a preparation method thereof.The catalyst is prepared through a coprecipitation method with cobalt nitrate, manganese nitrate and barium nitrate as active component precursors, and the preparation method specifically comprises the following steps that cobalt nitrate, manganese nitrate and barium nitrate are dissolved in deionized water to form a solution A; taking a potassium carbonate solution as a precipitator to form a solution B; mixing the solution A and the solution B to generate a precipitate by controlling the dripping rate and reaction conditions of the solution B; and centrifugally washing, drying and calcining to obtain catalyst powder, and finally forming particles. By optimizing the proportion of the active components and preparation process parameters, the problems of low activity, poor selectivity and insufficient stability of the existing catalyst are solved. The catalyst is suitable for industrial production and has the advantages of high efficiency, stability, low cost and the like.

The application belongs to the technical field of new energy materials, and specifically discloses a dual-phase solid electrolyte for electrochemical reduction of nitrogen to synthesize ammonia, which comprises the following steps: uniformly mixing and crushing barium nitrate, cerium nitrate, zirconium nitrate and yttrium nitrate, and then pre-sintering to obtain BCZY powder; uniformly mixing and crushing ZrO2 and Y2O3, and then pre-sintering to obtain YSZ powder; uniformly mixing the BCZY powder and the YSZ powder, and then molding into a green body; and sintering the green body at 1400-1500 DEG C for 10-12 h to obtain the dual-phase solid electrolyte BCZY@YSZ. The application also discloses a method for electrochemical reduction of nitrogen to synthesize ammonia by using the dual-phase solid electrolyte as an electrolyte layer. The application can ensure long-term service life and reliability of the electrolyte.

The invention belongs to the field of X-ray detection, and particularly relates to a barium nitrate single crystal X-ray detector and a preparation method thereof. The barium nitrate single crystal X-ray detector comprises a barium nitrate single crystal as well as a positive electrode and a negative electrode which are oppositely arranged on two sides of the barium nitrate single crystal, wherein the barium nitrate single crystal is a cubic crystal system. The barium nitrate single crystal X-ray detector is low in growth temperature, simple in preparation process, high in economic benefit, safe and environment-friendly, and high sensitivity and low dark current drift are realized.

The invention discloses a high-strength ceramic glaze and a preparation method thereof, and relates to the technical field of ceramic glazes. The wollastonite / potassium feldspar composite material is prepared from the following raw materials in parts by mass: 70 to 84 parts of wollastonite, 122 to 146.4 parts of potassium feldspar, 18 to 21.6 parts of aluminum oxide, 8 to 10 parts of lithium carbonate, 15 to 18 parts of nano-zinc oxide, 24 to 28.8 parts of modified titanium dioxide and 45 to 54 parts of composite toughening agent. According to the invention, modified titanium dioxide formed by coating the surface of ytterbium-doped titanium dioxide with a hexagonal boron nitride layer is introduced; by introducing the composite toughening agent, the hardness, the wear resistance and the crack resistance of a glaze surface prepared from the glaze material are effectively improved by virtue of the introduction of the composite toughening agent which is prepared by carrying out ball-milling mixing on composite powder and silicon carbide whiskers, wherein the composite powder is prepared from barium nitrate, calcium nitrate tetrahydrate, zirconium oxychloride and tetrabutyl titanate through sol-gel, drying and presintering, and carrying out ball-milling mixing and argon atmosphere heat treatment on the composite powder and the silicon carbide whiskers; the stripping resistance and the self-cleaning capability are realized. Therefore, the method has a wider application prospect.

The present invention relates to the field of nuclear chemistry, in particular radiochemistry, technologies for different stages of the nuclear fuel cycle, such as production of purified nuclear materials (uranium, zirconium) or reprocessing of spent nuclear fuel from nuclear power plants, where extraction processes and operations are used for purification of nuclear materials. The essence of the method, which includes partial decomposition of nitric acid during continuous evaporation while feeding a solution containing a reducing agent to the bottom part of an evaporator with a circulating bottom solution, lies in conducting the process so that after starting the process with an aqueous solution of formaldehyde and formic acid (hereinafter referred to as "mixture"), the solution remains in the bottom part of the evaporator for more than 2 hours with addition of the mixture or a solution of formic acid. This makes it possible to select a scenario where during evaporation of a model highly active raffinate at a given concentration level (specific volume of the bottom solution does not exceed 0.4 m 3 / ton of radioactive waste), barium nitrate does not precipitate and nitrous oxide is not released. In addition, due to a significant decrease (up to one tenth) in the formaldehyde concentration in the reducing agent and the possibility of continuing the process with a formic acid solution in the complete absence of formaldehyde, the fire and explosion safety of the process increases.

The invention belongs to the technical field of soft magnetic materials, and relates to a preparation method of a high-temperature-resistant insulated coated soft magnetic material. Comprising the following steps: reacting iron powder with a coupling agent; then adding an insulating coating layer precursor, adjusting the pH value, stirring and reacting, and generating a coating layer in situ; and carrying out heat treatment to obtain the high-temperature-resistant insulated coated soft magnetic material. The coupling agent is one or more of coupling agents such as aluminate, titanate, zirconate and a chromium complex; a precursor of the insulating coating layer is one or more of yttrium isopropoxide, tetrabutyl zirconate, aluminum isopropoxide, cerous nitrate, barium nitrate and magnesium nitrate. By designing the substrate-buffer transition interface-high-temperature-resistant oxide insulation coating layer high-temperature-resistant insulation multilayer composite material with the gradient thermal expansion coefficient, the resistivity of the magnetic powder can be improved, the magnetic loss can be reduced, and the high-temperature resistance can be greatly improved.

The invention discloses an activated carbon supported ruthenium catalyst for ammonia synthesis and a preparation method thereof. The catalyst is prepared by taking heat-treated activated carbon as a carrier, ruthenium metal as an active component and barium, silicon and cerium as auxiliaries. The preparation method of the catalyst comprises the following steps: firstly, carrying out heat treatment on activated carbon in an inert atmosphere and carrying out oxidation treatment in oxygen-containing mixed gas to obtain a heat-treated activated carbon carrier, drying, dipping in a carbonaceous organic matter aqueous solution, and carrying out oxidation treatment in a nitric acid atmosphere; then dipping and introducing barium nitrate and a ruthenium precursor solution, carrying out high-temperature treatment in an inert atmosphere, then adsorbing a silanol ammonia water solution, introducing a silicon component, finally dipping in a cerium nitrate water solution, and reducing to obtain the activated carbon supported ruthenium catalyst. Compared with the heat-treated activated carbon supported ruthenium catalyst prepared by the existing method, the catalyst prepared by the invention has higher ammonia synthesis activity and better application prospect.

The invention relates to the technical field of ferroelectric thin film materials, in particular to a ceramic-based high-energy-storage-density ferroelectric thin film material and a preparation method thereof.The preparation method comprises the following steps that S1, a premix is prepared, S2, a substrate is prepared, S3, a finished product is prepared, spin coating and curing treatment are conducted on the surface of the substrate through the premix, and the ceramic-based high-energy-storage-density ferroelectric thin film material is prepared. According to the invention, zinc and tin elements are introduced in the preparation of the additive, the zinc element can improve the insulativity of the film material, and by adding the tetrabutyl titanate and barium nitrate in the mixed solution, the titanium and barium elements contained in the mixed solution can form a regular crystal structure in the film, so that the film can accommodate charges orderly and avoid disorder and loss of the charges; barium ions with large ion radius can expand crystal lattices to form a stable interlayer structure, so that charge loss can be reduced, and electricity storage efficiency can be improved.

The invention discloses a synthesis method of a chloride-free cationic etherifying agent, and belongs to the technical field of cationic etherifying agents, and the method comprises the following steps: adding methyldiethanolamine and a catalyst into a reaction kettle, controlling the temperature at 15-25 DEG C, then adding acid, and keeping the temperature at 15-25 DEG C for 2-4 hours; dropwise adding epoxypropane, and reacting at 30 DEG C for 5-10 hours to obtain a cationic etherifying agent crude product; wherein the catalyst is a mesoporous silica supported phosphotungstic acid catalyst and is prepared by the following steps: dissolving phosphotungstic acid and barium nitrate in absolute ethyl alcohol, mixing and reacting with an absolute ethyl alcohol solution containing cetyltrimethylammonium bromide, then adding tetraethoxysilane and cyclohexane, standing, carrying out suction filtration, drying and calcining to obtain the mesoporous silica supported phosphotungstic acid catalyst. The prepared catalyst has excellent catalytic activity and stability, can significantly improve the reaction conversion rate and selectivity, effectively inhibits side reactions, and can be repeatedly used. The finally obtained cationic etherifying agent is high in purity, does not contain chloride ions, and meets the requirements of green chemical industry.

The invention discloses a micro-smoke type sulfur-free cycloalkane propellant which is prepared from the following components in parts by weight: 70 parts of an oxidizing agent, 34 parts of a combustible agent, 6 parts of an adhesive, 2 parts of a stabilizing agent, 2 parts of an anti-aging agent, 1 part of a catalyst and 2 parts of a smoke suppressor, the components are uniformly mixed according to a common method, and the oxidizing agent is prepared from potassium perchlorate, ammonium perchlorate and barium nitrate in a weight part ratio of 4: 9: 1; the combustible agent comprises smokeless charcoal, potassium hydrogen phthalate, nitrocellulose, 600-mesh purified terephthalic acid and hemp stalk carbon powder in a weight part ratio of 10: 4: 10: 5: 5; the adhesive adopts high-temperature-resistant phenolic resin; the stabilizing agent adopts calcium stearate; calcium phthalate is adopted as the anti-aging agent; basic cupric carbonate is adopted as the catalyst; the smoke suppressor adopts aluminum hydroxide. On the basis of keeping the advantages of the existing sulfur-free cycloalkane propellant, the smoke transmittance of the sulfur-free cycloalkane propellant is effectively improved.

The invention discloses an antibacterial and environmentally friendly ceramic and a preparation method thereof, belonging to the technical field of ceramics. The method comprises: dissolving aluminum chloride, barium nitrate and ferric nitrate in a solvent and stirring and mixing them to prepare a first mixed liquid; adding kaolin and carbon powder to the first mixed liquid and stirring and mixing them to obtain a second mixed liquid; dispersing boron, carbon, aluminum, boron oxide, zirconium dioxide and barium carbonate in a dispersant and mixing them to prepare a third mixed liquid; adding boron oxide, aluminum hydroxide, titanium boride, zirconium, silicon, sodium zirconate, sodium carbonate, calcium tungstate and zirconium dioxide to the second mixed liquid and stirring and mixing them to prepare a mixed slurry; using the mixed slurry to prepare an embryo body, placing the embryo body in a sintering furnace and performing sintering treatment at different temperature stages and sintering environments. The prepared ceramic has high strength, is not prone to cracking in an environment with rapid temperature changes, and has good corrosion resistance.

The invention relates to the technical field of metal coating liquid component detection, and particularly discloses a metal coating liquid component detection device and method. Comprising an electroplating tank, a stirring assembly arranged in the electroplating tank, a viscosity detection assembly used for monitoring metal coating liquid in real time, a sampling assembly used for uniformly sampling the metal coating liquid, and a complexing agent detection assembly used for detecting a metal coating liquid sample, the complexing agent detection assembly comprises a detection box, a titration piece, a ray generator and a ray receiving sensor, the titration piece can slowly dropwise add a barium nitrate solution, the ray generator can generate ray light, the ray light penetrates through the metal coating liquid sample to be received by the ray receiving sensor, and if citric acid does not exist in the metal coating liquid sample and the metal coating liquid sample becomes turbid, the detection box is determined to be a detection box. Therefore, the ray receiving sensor is influenced to receive ray light. The method has the effect of remarkably improving the detection efficiency and the detection real-time performance.