498 results about "Oil bath" patented technology

The invention discloses a flame-retardant thermoplastic polyurethane elastomer material and a preparation method thereof, and belongs to the technical field of modified nano materials. The preparation method comprises the following steps: dissolving melamine, phytic acid and boron nitride in deionized water, carrying out oil bath, adding a coupling agent, stirring, carrying out vacuum filtration, washing with water, and drying to obtain a layered nano flame retardant; the preparation method comprises the following steps: dispersing a flame retardant in deionized water containing a nonionic dispersant, and carrying out ultrasonic treatment; the preparation method comprises the following steps: reacting polyether polyol with diisocyanate to obtain a primary prepolymer; adding other auxiliary agents, stirring, and carrying out gradient heating polymerization; and injecting into a mold, curing for 6-12 hours at 105-125 DEG C, and drying for 12-24 hours at 80-90 DEG C. A phosphorus-nitrogen-silicon ternary synergistic flame-retardant system is introduced, the boron nitride nanosheet surface grafting and dynamic pre-polymerization-gradient heating process is optimized, the dispersity is improved, and smoke suppression and thermal stability are achieved. Compared with the prior art, the flame retardant efficiency is high, the mechanical property is excellent, and environmental friendliness is achieved.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The application discloses a preparation method of carbon aerogel material for light electromagnetic shielding, and comprises the following steps: adding resorcinol, phloroglucinol, a template agent and formaldehyde into pure water, stirring and dissolving to obtain a precursor solution; adding the precursor solution into white oil containing a surfactant, emulsifying, heating in an oil bath and fully reacting; centrifugal separation to obtain powder, high-temperature carbonization, dispersion in oleylamine, addition into a stock solution containing nickel acetylacetonate, triphenylphosphine and oleylamine, high-temperature reaction and cooling, addition of a mixture of hexane and ethanol to obtain a product; centrifugal separation and washing to obtain light high-electromagnetic-shielding carbon aerogel. The carbon aerogel material for light electromagnetic shielding prepared by the method has the advantages of small density, high efficiency, corrosion resistance, high electromagnetic shielding efficiency, high product yield and the like, and by controlling the nucleation and growth rate of Ni2P, the Ni2P nanoparticles can be uniformly grown on the carbon aerogel microspheres, and the method is suitable for application in large-scale industrial production.

The utility model discloses a capacitance method dielectric constant test system, which comprises a reaction kettle, a constant temperature oil bath pan, a data acquisition unit, a computer, a capacitance tester, a temperature transmitter, a pressure sensor and a capacitance test clamp assembly, and is characterized in that the reaction kettle is arranged in the constant temperature oil bath pan and is provided with a sealing cover; the measuring ends of the temperature transmitter, the pressure sensor and the capacitance tester are all arranged in the reaction kettle, the signal output ends of the temperature transmitter and the pressure sensor penetrate through the sealing cover to the outside of the constant-temperature oil bath pan and are connected with the input end of a data collector, the output end of the data collector is connected with a computer, and the computer is connected with the constant-temperature oil bath pan. The input end of the capacitance tester is connected with the capacitance test clamp assembly, and the output end of the capacitance tester is connected with the computer. The test system provided by the utility model simplifies test equipment, is accurate and reliable in measurement result, and can be used for measurement under high-temperature and high-pressure conditions.

The invention discloses a method for synthesizing eutectic gel by in-situ extraction of lignin, and belongs to the technical field of gel materials.The method comprises the steps that choline chloride and acrylic acid are mixed, heated in an oil bath and stirred, and a eutectic solvent is obtained; cooling the solvent, adding dried and crushed wood powder, heating in an oil bath, extracting to obtain a mixed solution, and centrifuging to obtain supernate; adding a cross-linking agent and an initiator into the supernate, heating, stirring, and cooling to room temperature to obtain a pre-polymerized solution; and pouring the pre-polymerized liquid into a polytetrafluoroethylene mold, and carrying out ultraviolet curing to obtain the target gel. According to the method, the natural structure and active groups of the lignin are reserved to the maximum extent, the method is low-carbon, energy-saving, green and sustainable, in-situ lignin and a polymerization network cooperate, the gel is endowed with higher mechanical strength, environmental stability and functional diversity, and the limitation of existing lignin doped gel is broken through.

The invention provides an iron-doped copper nanocluster nano-enzyme, a preparation method thereof and application of the iron-doped copper nanocluster nano-enzyme to detection of penicillin sodium by a colorimetric method. According to the preparation method, PVP-K30 and metal chlorate are taken as initial raw materials, deionized water is taken as a solvent environment, and the iron-doped copper nanocluster nanoenzyme is prepared through oil bath heating synthesis and dialysis purification. When 3, 3 ', 5, 5'-tetramethyl benzidine-hydrogen peroxide reaction is catalyzed by the nano-enzyme, the nano-enzyme is found to have an excellent peroxidase simulation effect, and rapid colorimetric detection of penicillin sodium is realized. The nano-enzyme provides an important thought for the development of novel nano-enzymes, and has a potential application value for the detection of antibiotics in a complex matrix.

The invention discloses a preparation method and application of an all-solid-state lithium-sulfur battery composite solid electrolyte, and belongs to the technical field of all-solid-state lithium-sulfur batteries. The preparation method comprises the following steps: firstly, preparing organic metal framework MOF particles with an ordered porous structure by adopting an oil bath method, taking polyethylene oxide as a substrate, adding an inorganic filler to prepare a composite polymer electrolyte membrane, and adding the MOF particles on the basis of the electrolyte membrane to prepare the composite solid electrolyte CPE-MOF. The MOF material prepared by the method shows a typical cubic structure, has a micron size, has good repeatability and controllability, and lays a solid foundation for research and application of subsequent material performance. The composite solid electrolyte prepared by the invention is applied to an all-solid-state lithium-sulfur battery, and shows relatively high specific discharge capacity, stable cycle performance and good rate capability.

The invention discloses a preparation method of cellulose micron sheet powder and a high-haze transparent film thereof, which comprises the following steps: S1, crushing bamboo pulp foil to obtain a cellulose raw material; s2, placing in a sulfuric acid solution, stirring in an oil bath for hydrolysis, adding water after reaction, taking out, and placing in a polytetrafluoroethylene hydrothermal synthesis reaction kettle for auxiliary reaction to obtain a milk white suspension; s3, centrifuging and dialyzing the milk white suspension until the pH is nearly neutral; s4, performing ultrasonic treatment on a product in S3 by adopting an ultrasonic cell crusher, and performing freeze drying to obtain powdery cellulose micron sheets; according to the invention, through reasonable optimization of acidolysis and hydrothermal process parameters, the powdery cellulose micron sheet with uniform thickness and no irreversible keratinization defect is obtained, has excellent redispersibility after rehydration, can be compounded with polyvinyl alcohol to form a high-haze transparent film, and overcomes the defect that in the subsequent drying process of sulfuric acid hydrolysis of micro-nano cellulose, the film is not easy to form, and the film is not easy to form. The problems of irreversible agglomeration and poor rehydration redispersibility caused by hydrogen bond induction are solved.

A ball screw bearing oil lubrication durability test device disclosed by the present invention comprises a tool table and two tool sleeves oppositely arranged on the tool table, the tool sleeves are provided with oil cavities, the oil cavities are filled with lubricating grease, and a ball screw bearing to be tested is movably arranged in the oil cavities. The tool table is provided with a driving part used for driving a screw part of the ball screw bearing to be tested to rotate and a loading part used for applying an axial load to a nut part of the ball screw bearing to be tested. The tool sleeve is provided with a sealing structure which is used for being in linkage cooperation with the driving piece and the loading piece so as to achieve dynamic sealing of the oil cavity when the ball screw bearing to be tested operates. The problem that a traditional ball screw bearing test tool is difficult to test the bearing on the premise of simulating the actual operation condition, the actual oil bath lubrication environment condition and the loading condition of the bearing, and consequently the test precision and the test efficiency are low is solved.

The invention discloses a preparation method and application of a CuCo2S4 nanotube cluster / Zn3In2S6 nanosheet composite photocatalyst in the field of photocatalytic materials, the catalyst takes a cobalt sulfide copper nanotube cluster as a substrate, an indium zinc sulfide nanosheet layer is loaded on the surface, and a unique composite structure is formed. The preparation method comprises the following steps: preparing a CuCo nanotube cluster precursor through a hydrothermal method, and further preparing the CuCo2S4 nanotube cluster / Zn3In2S6 nanosheet composite photocatalyst through vulcanization and an oil bath method. The preparation method is simple, raw materials are easy to obtain, conditions are mild, control is easy, and the method is suitable for large-scale production. The prepared catalyst has high specific surface area and good dispersibility, also shows high carrier separation efficiency and strong light absorption performance, and can significantly improve the efficiency of photocatalytic decomposition of water to produce hydrogen and the efficiency of heavy metal removal under visible light.

The invention discloses a method for preparing a polyvinyl alcohol flame-retardant film by using walnut green seedcase carbon dots and application of the polyvinyl alcohol flame-retardant film, and belongs to the technical field of composite materials. The preparation method of the flame-retardant film comprises the following steps: mixing a walnut green seedcase carbon dot solution with polyvinyl alcohol, carrying out oil bath heating treatment, cooling to room temperature, carrying out film forming on the obtained walnut green seedcase carbon dot-polyvinyl alcohol mixed solution in a casting manner, and finally, carrying out drying treatment to obtain the target flame-retardant film. According to the method, the walnut green seedcase is used as a raw material to prepare the carbon dots, hydrolytic tannin and quercetin components contained in the walnut green seedcase are fully utilized, resource recycling of waste is achieved, and the production cost of the flame-retardant film is remarkably reduced. The prepared flame-retardant film has the characteristics of portability and certain mechanical strength, is suitable for various scenes with requirements on light flame-retardant materials, has an excellent flame-retardant effect, can effectively delay or even block flame diffusion, and greatly improves the use safety of the materials.

The invention belongs to the technical field of fuel cell membrane electrode preparation, and particularly discloses a preparation method for improving fuel cell catalyst layer ionomer distribution, which comprises the following steps: placing a carbon nanotube in dilute nitric acid, carrying out uniform ultrasonic dispersion, then carrying out oil bath heating, carrying out continuous acidification treatment, then carrying out suction filtration, and drying to obtain a carbon nanotube catalyst layer; carbon nano tube powder subjected to acidizing treatment is obtained; mixing the acidized carbon nanotube powder with a Nafion solution in proportion, and removing a solvent through rotary evaporation to obtain a carbon nanotube-Nafion compound; mixing the carbon nanotube-Nafion compound with a commercial Pt / C catalyst, deionized water and ethanol in proportion, and performing ultrasonic treatment under an ice bath condition to obtain uniformly dispersed cathode catalyst slurry; and spraying the uniformly dispersed cathode catalyst slurry on the cathode side of the proton exchange membrane to obtain the catalyst layer for improving ionomer distribution.

The invention discloses a preparation method of a high-performance bagasse hard carbon negative electrode material. According to the invention, bagasse is taken as a raw material, constant-temperature pickling treatment is carried out, carbonization conditions are accurately controlled, an oil bath auxiliary activator is adopted to activate the carbon material, carbon layer spacing is specifically enlarged, closed pores are constructed, and the structure and electrochemical performance of the hard carbon material are significantly improved. The solid activating agent is decomposed under the oil bath condition to generate a gas-phase oxidizing agent, hard carbon is mildly and uniformly etched and modified from the interior of particles, pores are created, meanwhile, a graphite microcrystalline structure beneficial to sodium storage is better reserved and optimized, and the first effect, the reversible specific capacity, the cycling stability and the platform capacity ratio of the hard carbon negative electrode material are improved.

The application provides a preparation method of a nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The method comprises the following steps: (1) stirring and mixing a nitrogen-doped carbon carrier with an alcohol solvent to obtain a uniformly dispersed system A; (2) uniformly mixing a metal precursor with an alcohol solution by ultrasonic mixing to obtain a uniformly dispersed system B; (3) uniformly stirring and mixing the system A and the system B, then performing oil bath heating, and then performing washing and drying to obtain a nitrogen-doped carbon-supported platinum-cobalt alloy; and (4) placing the product obtained in step (3) into a porcelain boat, annealing the product in an inert atmosphere at a high temperature, and cooling the product to room temperature to obtain the nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst prepared by the method has a uniform particle distribution and exhibits good catalytic activity and stability in an oxygen reduction reaction (ORR) of a fuel cell.

The invention discloses a preparation method and application of a heterojunction catalyst based on a two-dimensional zinc porphyrin metal organic framework, and belongs to the field of photochemical energy conversion and photocatalytic degradation. The invention aims to solve the technical problems of high-quality preparation of the artificial photosynthetic photocatalytic composite material and how to effectively improve the photochemical energy conversion efficiency. The method comprises the following steps: 1, dissolving bismuth nitrate pentahydrate, sodium tungstate dihydrate and sodium dodecyl dimethyl benzene sulfonate in deionized water, fully stirring, and transferring the solution to a reaction kettle for hydrothermal reaction; cooling to room temperature, washing and drying to obtain bismuth tungstate solid powder; 2, adding bismuth tungstate and meso-tetra (4-carboxyl phenyl) porphin into a mixed solution of N, N-dimethylformamide and ethanol, carrying out ultrasonic treatment, and fully stirring to obtain a solution A; dissolving zinc nitrate hexahydrate, pyrazine and polyvinylpyrrolidone in a mixed solution of N, N-dimethylformamide and ethanol, and fully stirring to obtain a solution B; after the solution is fully dissolved, dropwise adding the solution B into the solution A under ultrasonic and stirring conditions, and then putting the beaker into an oil bath pan for heating; and cooling to room temperature, washing, and storing in an ethanol solution to obtain the Zn-MOF / Bi2WO6 heterojunction composite material.

The invention relates to a method for preparing anionic polymerized polyamide 6 with a high reaction rate by adopting a double-activation system. S2, putting the caprolactam dried in the step S1 into a beaker at room temperature, then putting the beaker into an oil bath pan, heating until the caprolactam is completely melted, and starting stirring; the method comprises the following steps: putting caprolactam into a 500ml three-necked flask at room temperature, then putting the three-necked flask into a 500ml electric heating jacket, heating until the caprolactam is completely melted, and starting mechanical stirring by using a stirring paddle to generate two active intermediates and three block structures, and the polymer has the advantages of stable polymerization time, excellent mechanical properties, high polymerization rate, good thermal stability, high antioxidant degree, high crystallinity and the like.

The invention discloses an Avgamdeo law demonstrator, which realizes preparation of a dry air environment and quantitative water injection through combination of a rigid air tank (1), a constant-temperature oil bath system, a multifunctional port (2) and a pressure monitoring device. Under the constant-temperature and constant-volume condition, liquid water is vaporized to form wet saturated air by injecting water (the mass ratio is 0.622) with the number equal to that of air molecules, the driving pressure is increased from 1 atm to 2 atm, and the direct proportion relation between the number of gas molecules and the pressure is visually verified. The device fills up the blank of an instrument for quantitatively demonstrating the Avudgdow's law in chemistry and thermotics teaching in high schools and universities.

The invention relates to a preparation method of a trace Fe optimized Ru nano-catalyst and application of the trace Fe optimized Ru nano-catalyst in hydrodechlorination reaction of parachlorophenol. The preparation method comprises the following specific steps: firstly, dissolving ruthenium chloride hydrate and ferric trichloride into ethylene glycol, adding PVP (Polyvinyl Pyrrolidone) into the solution, fully mixing, adjusting the pH value of the solution to 3-4, transferring into a glass bottle, and heating and reacting in an oil bath pan at 180 DEG C; and centrifuging, washing and drying the obtained product to obtain a black powdery solid, namely the Ru-Fe nano-catalyst. The hydrodechlorination process is carried out in a double-chamber electrolytic tank separated by a Nafion 117 membrane, an electrolyte is a Na2SO4 solution, a Ru-Fe electrode taking carbon cloth as a carrier is used as a working electrode, a Pt sheet is used as a counter electrode, and an Ag / AgCl electrode is used as a reference electrode. The Ru-Fe nano-catalyst provided by the invention has the advantages of stable structure, uniform metal distribution and excellent electron synergistic effect, and can efficiently catalyze hydrodechlorination of p-chlorophenol and generate cyclohexanol. The preparation process is simple, convenient and environment-friendly, has a good industrial application prospect, and is particularly suitable for green treatment and resource conversion of chlorine-containing organic wastewater.

The application provides a preparation method of a SERS substrate of a zirconium-based MOF-808 / AuNPs. The method comprises three steps: in the first step, an AuNPs solution is prepared by using deionized water, chloroauric acid and sodium citrate to perform an oil bath reaction to obtain the AuNPs solution; in the second step, MOF-808 is prepared by mixing zirconium chlorohydrate, 1,3,5-benzene tricarboxylic acid, N,N-dimethylformamide and formic acid, and then performing a hydrothermal reaction on the mixed solution, centrifuging and vacuum drying to obtain activated MOF-808-Zr powder; in the third step, the activated MOF-808-Zr powder is dissolved in anhydrous ethanol, and then fully stirred and mixed with AuNPs solutions of different amounts to form a zirconium-based MOF-808 / AuNPs solution; and in the fourth step, the zirconium-based MOF-808 / AuNPs solution is poured into sample boxes containing silicon substrates, and the silicon substrates are immersed, and after drying, a SERS substrate of the zirconium-based MOF-808 / AuNPs is obtained. The method has the advantages of simple preparation process, low cost, good uniformity of the prepared substrate, good signal repeatability, high sensitivity, good structural stability and the like.

The constant-temperature water-oil bath pan comprises an equipment box body, a spiral heating rod and a temperature sensor are fixedly installed at the bottom of a stainless steel inner container, a turbulent flow paddle is rotationally connected to the center of the bottom of the stainless steel inner container, and a plurality of supporting lugs are fixedly connected to the inner wall of the stainless steel inner container in an annular array mode. A clamping groove is formed in the surface of the supporting lug, an annular supporting frame is clamped and fixed in the clamping groove, a supporting net is fixedly connected to the inner wall of the annular supporting frame, a liquid discharging pipe communicated with the stainless steel inner container is arranged on the left side of the equipment box body, a control panel is arranged on the surface of the equipment box body, and a heating rod switch, a turbulent flow switch and a temperature rotary knob are arranged on the control panel. Through the arrangement of the supporting lugs, the clamping grooves, the annular supporting frame and the supporting net, the whole annular supporting frame can be conveniently communicated with the supporting net to be disassembled through the mutual clamping relation of the annular supporting frame and the clamping grooves, and therefore convenience is provided for cleaning the spiral heating rod and the interior of the stainless steel inner container.

A work machine motor drive assembly according to the present invention comprises a motor, a fixed case, a high-speed rotation mechanism, a housing, and a low-speed rotation mechanism. The fixed case includes a first internal space and a lubricating oil passage. The lubricating oil passage supplies lubricating oil to the first internal space. The high-speed rotation mechanism is provided in the first internal space. The high-speed rotation mechanism is connected to the motor. The high-speed rotation mechanism is lubricated via a dry sump system by the lubricating oil supplied through the lubricating oil passage. The housing includes a second internal space in which lubricating oil is sealed. The housing is rotatably supported by the fixed case. The low-speed rotation mechanism is provided in the second internal space. The low-speed rotation mechanism reduces the speed of rotation by the high-speed rotation mechanism and transmits the rotation to the housing. The low-speed rotation mechanism is lubricated by an oil bath of the lubricating oil in the second internal space.

The application discloses a methyl sulfonate derivative and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding carboxylic acid, dimethyl sulfoxide (DMSO) and potassium fluoride (KF) into a pressure-resistant reaction bottle, and heating at 180 DEG C for 6 hours through an oil bath; (2) after the reaction is completed, the obtained substance is extracted with ethyl acetate for three times, the organic layer is washed with water for two times in sequence, the washed organic layer is dried with anhydrous sodium sulfate, filtration is conducted, and a filtrate is obtained; (3) the obtained filtrate is concentrated under reduced pressure, the concentrated residue is separated and purified by using a silica gel column chromatography, and the methyl sulfonate derivative is obtained. The preparation method directly uses KF to catalyze the reaction of carboxylic acid and DMSO, does not need to use complex substrates, noble metal catalysts and phosphorus ligands, and has the advantages of simple operation, greenness, low cost and high yield (up to 92%).

The invention discloses a ZSM-48 molecular sieve preparation method, which comprises: (1) adding agar into water, heating in an oil bath at a temperature of 105-120 DEG C to completely dissolve the agar so as to form an agar solution, and cooling the agar solution to a temperature of 70-80 DEG C; (2) adding a silicon source, a template agent, absolute ethyl alcohol and a first alkali source into the agar solution, and stirring at 70-80 DEG C to form a suspension containing microcapsules; and (3) adding an aluminum source and a second alkali source into the suspension, uniformly stirring to form a reaction solution, and then aging, crystallizing, filtering, washing and roasting to obtain the ZSM-48 molecular sieve. The invention also discloses a ZSM-48 molecular sieve supported metal catalyst prepared by adopting the ZSM-48 molecular sieve and application of the catalyst in a hydroisomerization reaction. The agar is used for dispersing the reaction materials to limit the reaction speed and improve the particle size and dispersity of the molecular sieve crystal grains, agglomeration of the crystal grains is avoided, and more acid sites can be released.

The utility model discloses an oil bath type air filter assembly, which relates to the technical field of air filters, and comprises an oil bath type air filter body, a lower end cover which is arranged at the bottom of the oil bath type air filter body and is filled with engine oil, and a heating mechanism which is arranged in the lower end cover, the heating mechanism comprises a metal plate fixedly arranged on the inner wall of the lower end cover and internally provided with a through hole and an electric heating piece fixedly arranged at the bottom of the metal plate, and a stirring mechanism used for stirring engine oil in the lower end cover is arranged at the bottom of the lower end cover; the engine oil in the lower end cover can be heated through the electric heating piece, the electric heating piece can transfer heat to the metal plate, the metal plate can increase the heating area of the engine oil in the lower end cover, the engine oil in the lower end cover is stirred through the stirring mechanism, and the engine oil can be evenly heated; therefore, engine oil in the oil bath type air filter assembly can keep good flowing in cold weather, normal use of the oil bath type air filter assembly in severe environments such as cold environments is guaranteed, and the oil bath type air filter assembly is suitable for being popularized in a large scale.

The invention discloses a method for improving the photocatalytic antibacterial performance of ternary metal sulfide based on an A-site deletion strategy, which comprises the following steps: firstly, according to the molar ratio of A-site metal ions to indium ions of x: 2, wherein 0 lt; xlt; the method comprises the following steps: 1, selecting and weighing a corresponding A-site metal source, an indium source and a sulfur source according to an adaptive proportion of sulfur ions; the method comprises the following steps: dissolving an A-site metal source and an indium source in deionized water, stirring at room temperature for 30 minutes to obtain a mixed solution, adding a sulfur source, and stirring until the sulfur source is dissolved into a precursor solution; vigorously stirring and reacting the precursor solution in an oil bath at 80-120 DEG C for 3-8 hours to obtain a turbid liquid, centrifuging for 5-30 minutes at 3000-8000 r.p.m., collecting precipitates, cleaning for 2-5 times, and dispersing; and performing ultrasonic treatment for 0.5-5 hours at 200-300 W, and centrifuging to take clear liquid, thereby obtaining the AxIn2S3 + x material. The method does not need special equipment and harsh conditions, and is simple in process, high in controllability and easy to realize large-scale production.

The invention discloses a preparation method of a superfine PtIr nanowire catalyst for ammoxidation. The preparation method comprises the following steps: firstly, fully dissolving platinum acetylacetonate, iridium acetylacetonate, tungsten hexacarbonyl and dodecyl trimethyl ammonium bromide in oleylamine to obtain a light yellow solution; carrying out ultrasonic treatment on the obtained light yellow solution until the solution is fully dissolved; and heating the obtained uniform light yellow solution to 190 DEG C in an oil bath, keeping the temperature for 5 hours, centrifuging, washing and drying to obtain the superfine PtIr nanowire catalyst. The nanowire structure has a high specific surface area and abundant active sites, and is beneficial to effective quality and electron transmission. Through alloying of Ir and Pt, the electronic structure on the surface of the catalyst is changed, and the poisoning probability is effectively reduced. Meanwhile, the adsorption and activation process of ammonia molecules is optimized through the synergistic effect between Pt and Ir, the reaction activation energy is reduced, and the reaction rate is remarkably increased. The catalyst not only has remarkable ammonia oxidation catalytic performance, but also is good in stability and simple in preparation process.

The invention belongs to the field of fine chemical engineering and the technical field of low-temperature co-fired ceramics, and discloses inner electrode copper paste for low-temperature co-fired ceramics as well as a preparation method and application of the inner electrode copper paste. The method comprises the following steps: adding ascorbic acid, polyethylene glycol and polyvinylpyrrolidone into ethanol, carrying out oil bath stirring to obtain an organic coating solution, and then adding copper powder to prepare copper powder coated with a polyvinylpyrrolidone film; the preparation method comprises the following steps: preparing mixed powder from silicon dioxide, boric acid, calcium carbonate, sodium carbonate, potassium carbonate and copper oxide, sintering at 1200-1500 DEG C to prepare molten glass, and carrying out water quenching on the molten glass to obtain borosilicate glass powder; mixing a solvent, a binder, a thixotropic agent, an additive A and the like to prepare an organic carrier; and magnetically stirring the copper powder coated with the polyvinylpyrrolidone film, the glass powder, the organic carrier and the additive B, and grinding and leveling by using a three-roller mill to obtain the inner electrode conductive copper paste. The conductive copper paste prepared by the method has the performance of preserving heat for a long time at a relatively high temperature, and is good in printing performance and excellent in conductivity.

The application relates to the field of material polarization, and relates to a composite polarization device and a polarization method of a composite piezoelectric material. The device comprises an insulating container, a negative electrode plate, a flexible insulating cover, an insulating liquid and a positive electrode needle. The flexible insulating cover is arranged on the negative electrode plate, the insulating liquid is used for filling in the insulating container, and the positive electrode needle is arranged above an open cavity of the insulating container and used for generating corona to a sample to be polarized. The device combines the advantages of two polarization methods of a direct-current oil bath polarization method and a corona polarization method. The insulating liquid is filled in the insulating container, the small gap between the insulating container and the flexible insulating cover and the complex hollow structure inside the sample to be polarized can be filled, so that the breakdown of any weak point in the polarization process can be prevented. The composite piezoelectric material is polarized by using the composite polarization device, and the polarization voltage can be improved under the condition that the corona discharge is stable and normal.

The invention discloses a preparation method of nano sulfur, which comprises the following steps: (1) adding 5-10 g of sublimed sulfur and 50 mL of N-methyl pyrrolidone into a 300 mL round-bottom flask, then placing the round-bottom flask in an oil bath at 25-125 DEG C, and stirring for 15-60 min; and (2) filtering the mixture to take filtrate, then adding the filtrate into a 300 mL beaker, adding 100-200 mL of deionized water into the beaker at one time at normal temperature under vigorous stirring, and continuously stirring for 5-10 minutes. And (3) centrifugally separating the mixture at 8000-12000 rpm for 5-10 min or filtering the mixture to obtain a precipitate, and washing the precipitate with deionized water for 3 times. And (4) placing the washed precipitate in a vacuum drying box at 80 DEG C, and drying for one night to obtain the nano sulfur. Researches show that sublimed sulfur is taken as a raw material, N-methyl pyrrolidone is taken as a solvent, deionized water is taken as a titration solvent, nano sulfur is prepared by adopting a heterogeneous titration method, and the method is simple in process, easy to operate, easy in condition control, low in synthesis cost and suitable for industrial large-scale production.

The invention belongs to the technical field of aging testing devices, and provides a composite material aging testing device and method.The composite material aging testing device comprises a testing machine, a temperature control box, an oil bath box and a circulating oil supply system, the temperature control box is fixedly installed on a main body rack of the testing machine, and the oil bath box is fixedly installed in the temperature control box; a test piece is mounted on a mechanical loading shaft of the testing machine, and a temperature control box, an oil bath box and the testing machine are integrated, so that a real service environment of the test piece under the conditions of oil infiltration, temperature circulation and continuous static load is reproduced, and a circulating aging process of axial static load locking, constant-temperature oil bath static immersion and oil discharge cooling is realized; the dry-wet alternation effect that a lubricating oil film repeatedly covers and is separated from a gluing interface in the gearbox is strictly reproduced, it is ensured that the laboratory aging mechanism is consistent with the actual service failure mechanism, and the data accuracy is improved.