35 results about "Dimethylglyoxime" patented technology

The invention provides sunlight-driven rapid self-repairing high-toughness polyurethane as well as a preparation method and application thereof, and relates to the technical field of ecological polymer materials. According to the sunlight-driven rapid self-repairing high-toughness polyurethane provided by the invention, diisocyanate, a chain extender, an organic solvent, a catalyst, dimethylglyoxime and heterojunction nanocrystals are taken as preparation raw materials, wherein the heterojunction nanocrystals comprise one or more of TiO2-CuS, CuO-CuS, TiO2-CuO and ZnS-CuS. Specific heterojunction nanocrystals are selected, the light absorption range of self-repairing polyurethane is widened, the light absorption efficiency is enhanced, excellent antibacterial performance is given, and efficient self-repairing of damage under driving of natural light such as sunlight is achieved in combination with a specific dynamic structure of self-repairing polyurethane. Meanwhile, the heterojunction nanocrystals and oxime bonds generate a coordination effect, so that the polyurethane material has the mechanical properties of high strength, high toughness and the like.

The invention discloses a high-flexibility bio-based polyurethane fluorescent material capable of being self-repaired at room temperature and a preparation method of the high-flexibility bio-based polyurethane fluorescent material, and belongs to the technical field of polyurethane materials. The preparation method comprises the following steps: generating a prepolymer from diisocyanate and polypropylene carbonate glycol under the action of a catalyst; carrying out chain extension reaction by taking dimethylglyoxime as a chain extender to generate a polyurethane material PUDMG containing ketoxime bonds; after PUDMG is dissolved, the PUDMG and a mixture of terbium nitrate hexahydrate and europium nitrate hexahydrate are subjected to a coordination reaction, and finally a target product is prepared. By introducing a dimethylglyoxime chain extender, a dynamic ketoxime bond is constructed in a polymer network, and the room-temperature efficient self-repairing of the material is realized; meanwhile, dimethylglyoxime provides effective coordination sites for Tb < 3 + > and Eu < 3 + >, and the dimethylglyoxime, the Tb < 3 + > and the Eu < 3 + > have a synergistic effect, so that the material is endowed with strong fluorescence performance, and meanwhile, the mechanical property and the self-repairing efficiency are further enhanced. The material is simple in preparation method and has a wide application prospect in the fields of flexible electronic devices and anti-counterfeiting.

The invention discloses a nickel-cobalt hydrometallurgy circulation process, and relates to the technical field of hydrometallurgy. On one hand, magnesium sulfate solution wastewater is converted into magnesium salt liquid to replace sodium hydroxide to be saponified with an organic phase, and meanwhile water for a production line can be saved. Carbon dioxide waste gas is recycled, and industrial waste gas resource conversion and reuse are achieved. On the other hand, high-efficiency recovery of cobalt and nickel in the waste liquid is realized by preparing a functional material: a resin filtering membrane with a coordination trap on the surface is formed by virtue of Zn < 2 + > coordination activation, and cobalt and nickel ions in the waste liquid are efficiently captured; the preparation method comprises the following steps: pre-synthesizing a dimethyl glyoxime functional ligand with carboxyl by taking dimethylglyoxime and bromoacetic acid as raw materials, and directly constructing MOF (Metal Organic Framework) with a dimethyl glyoxime group for chelating Ni < 2 + >; the prepared adsorption particles are subjected to secondary adsorption in waste liquid after passing through resin, so that cobalt and nickel ions in the waste liquid reach an extremely high recovery rate. The hydrometallurgy can achieve the effect of neither recovery nor circulation.

The invention belongs to the field of novel functional polymer materials, and discloses a preparation method of a selenium-containing polymer material capable of fixing metal ions, and the preparation method comprises the following steps: S1, adding PTMEG into a round-bottom reaction flask filled with inert gas, and placing the round-bottom reaction flask in an oil bath pan for melting; s2, MDI, dimethylglyoxime, DSe and anhydrous N, N-dimethylacetamide are sequentially added and fully mixed; s3, stannous octoate and CuCl2 are added at the same time; s4, keeping the temperature of the oil bath pan and continuously reacting; s5, after the reaction is finished, a polymer is precipitated out, and secondary cleaning is conducted through methyl alcohol. The preparation method has the advantages that oximido is introduced into a polyurethane molecular structure to fix metal ions, meanwhile, selenium is introduced in a covalent fixation mode, and through double-site introduction of the metal ions and the selenium, the molecular structure of the polyurethane is greatly improved; the NO catalytic release rate of the material can be regulated and controlled, so that the biocompatibility and applicability of the polymer material in a blood environment are improved, and the application scene is further widened.

The application discloses an improved iodine oxidation-dimethylglyoxime spectrophotometry for detecting the content of nickel in steel, which comprises the following steps: obtaining an acidolysis solution by acidolysis of the steel to be detected; then diluting the solution to obtain a mother liquor to be detected; mixing the mother liquor to be detected with an ammonium citrate solution, water, an iodine solution, ammonia water and a dimethylglyoxime solution to obtain a chromogenic solution to be detected; and placing the chromogenic solution to be detected below a critical temperature to perform spectrophotometry to obtain the content of nickel in the steel to be detected. The application controls the adding amount of the ammonium citrate and the dimethylglyoxime in the chromogenic solution to be detected and the chromogenic temperature, so that the stable time of the absorbance of the chromogenic solution to be detected is greater than or equal to 60 minutes, the detection of the content of copper in the steel to be detected is less than or equal to 0.2%, and the probability of the result of the detection of the content of nickel in the steel to be detected (0.10%-50%) exceeding the allowable error of a navigation mark is less than or equal to 5%.

This disclosure describes compositions including dimethylglyoxime (DMG) and methods of using those compositions including, for example, to reduce the availability of nickel in the subject. In some aspects, the composition may be administered to a subject suffering from or susceptible to a bacterial infection and / or to a subject suffering from or susceptible to a amyloid-β peptide aggregation. In some aspects, this disclosure describes using DMG or a composition including DMG to disrupt a biofilm or reduce the likelihood of biofilm formation.

The invention discloses a preparation method and application of a high-elongation-at-break flexible self-healing heat-conducting composite material for a robot. The composite material is prepared by taking polycaprolactone diol, isocyanate, dimethylglyoxime and spherical aluminum oxide as raw materials, constructing a polyurethane matrix with a'dynamic-permanent 'double-crosslinking network structure and regulating and controlling the content of the spherical aluminum oxide. Wherein the permanent cross-linked network provides a rigid framework and high-strength support; a dynamic cross-linked network (composed of hydrogen bonds and dynamic oxime-urethane bonds) endows the material with energy dissipation capability and self-repairing characteristics. The spherical aluminum oxide filler has double functions in the system: the spherical aluminum oxide filler is used as a rigid reinforcing phase to improve the mechanical property; the heat conductivity coefficient is obviously improved as a high-efficiency heat-conducting channel. The composite material has high tensile strength, ultrahigh elongation at break and excellent bendability, and can self-repair damage for multiple times. The method is simple in preparation process and low in cost, and has wide application prospects in the fields of heat dissipation of flexible wearable electronic equipment and the like.

The application belongs to the technical field of metal-based catalysts, and discloses a metal Rh-based catalyst, a supported catalyst thereof, a preparation method and application. The metal Rh-based catalyst is formed by coordination of a metal Rh central atom with a butanedione oxime ligand and a triphenylphosphine and substituted derivative ligand, and has a structure shown in formula (1). The supported metal Rh-based catalyst is formed by loading the metal Rh-based catalyst on a porous carrier. The metal Rh-based catalyst and the supported catalyst thereof prepared by the application can realize efficient hydroformylation of isooctene to form iso-nonyl aldehyde, and show high isooctene conversion rate and iso-nonyl aldehyde selectivity.

The invention relates to the technical field of sodium ion battery electrode materials, in particular to a bismuth-nickel bimetallic selenide-containing composite material and a preparation method and application thereof. The preparation method comprises the following steps: carrying out hydrothermal reaction on a rod-like copper butoxide-nickel precursor which is unstable in structure under high-temperature pyrolysis and is used as a nickel source and a bismuth source, and then selenizing with selenium in an inert atmosphere in a vapor deposition manner; and cooling to room temperature to obtain the bismuth-nickel bimetallic selenide composite material of the two-dimensional nano-plate loaded nano-particles. According to the method, low thermal stability of nickel dimethylglyoxime is fully utilized, and conversion of rod-porous-small nano-particles is achieved in the pyrolysis-selenylation process. The morphology transformation is beneficial to finally and uniformly coating the surface of the bismuth selenide nano-plate. The raw materials used in the method are cheap and rich in source, the preparation period is short, and the stability is good. Meanwhile, the complementarity of the working potentials of the two components in the sodium storage process can also realize efficient sodium storage in the whole voltage range.

The invention belongs to the technical field of water electrolysis hydrogen production catalysts, and relates to a preparation method of a high-crystallinity self-supporting nickel sulfide nanosheet, which comprises the following steps: 1, dissolving dimethylglyoxime in absolute ethyl alcohol to form a solution A, and dissolving nickel nitrate hexahydrate in deionized water to form a solution B; 2, mixing and stirring the solution A and the solution B to generate nickel dimethylglyoxime precipitate; 3, centrifugally separating the nickel dimethylglyoxime precipitate, and alternately washing with deionized water and ethanol; 4, the purified nickel dimethylglyoxime is dispersed in a mixed solvent composed of deionized water and ethyl alcohol, and a dispersion system is obtained; 5, adding sodium sulfide into the dispersion system, uniformly mixing, and reacting at a constant temperature; 6, after the constant-temperature reaction is finished, naturally cooling to room temperature, centrifugally separating a solid product, washing with deionized water and ethanol, and carrying out vacuum drying to obtain the nickel sulfide electrocatalyst; the method is simple and easy to operate, and an effective scheme is provided for solving the problem of high cost of a traditional noble metal catalyst in the field of water electrolysis hydrogen production.

The invention relates to the technical field of palladium recovery, in particular to a method for recovering palladium from a silver anode mud pickling solution. According to the technical scheme, the method comprises the following steps: palladium precipitation pretreatment: providing a silver anode mud nitric acid washing solution, heating to 50-90 DEG C, carrying out water-based palladium precipitation, directly adding solid dimethylglyoxime or a water-based suspension of dimethylglyoxime into the heated washing solution in a stirring state, and reacting to generate dimethylglyoxime palladium precipitation; wherein the adding amount of the dimethylglyoxime is 1.0-2.5 times of the amount of the precipitated palladium, calcining to remove impurities, and separating the palladium dimethylglyoxime precipitate. The cost of an ethanol solvent and a special explosion-proof facility is saved, the safety investment is reduced, formic acid is used as a common chemical raw material, is easy to obtain and low in cost, reduces the production cost and the supply chain risk, is suitable for treating raw materials with different concentrations, is easy to popularize and implement on the existing hydrometallurgical equipment, and has a wide application prospect. The invention provides a novel palladium recovery technical route which is safer, more environment-friendly, higher in product purity and easier for industrial application.

The invention discloses a method for analyzing and testing the content of palladium in palladium-loaded diatomite, and belongs to the technical field of chemical analysis of noble metal materials. The analysis and test method comprises the following steps: melting a palladium-loaded diatomite sample in an alkaline flux, leaching, carrying out acid inversion, completely dissolving the sample, adding a dimethylglyoxime solution to generate a precipitate, filtering, weighing, and calculating the content of the palladium element. In addition, the problem that a quantitative analysis technology for the palladium element in the palladium-loaded diatomite sample is lacked is solved, and the test method is accurate, rapid, scientific and reliable.

The invention belongs to the technical field of preparation of dimethylglyoxime, and provides a method for preparing dimethylglyoxime through multistage oximation. The method comprises the following steps: continuously introducing 2, 3-butanedione into a first reactor; continuously introducing a hydroxylamine salt aqueous solution and ammonia water into the second reactor; the method comprises the following steps: carrying out first reaction on 2, 3-butanedione, a hydroxylamine salt aqueous solution and ammonia water in a first reactor to obtain a ketoxime mixture; performing a second reaction on the ketoxime mixture, a hydroxylamine salt aqueous solution and ammonia water in a second reactor, and separating to obtain dimethylglyoxime and a mother solution containing hydroxylamine salt; the mother liquor containing the hydroxylamine salt is reused in the first reactor. According to the method, the utilization rate of the 2, 3-butanedione and the hydroxylamine salt is remarkably improved, the residual quantity of the hydroxylamine salt and the butanedione oxime is reduced, and the yield, the selectivity and the purity of the butanedione oxime are remarkably improved. Meanwhile, the method disclosed by the invention is simple in process flow, simple and convenient to operate, capable of realizing continuous production and beneficial to industrial production of dimethylglyoxime, and has a relatively great application prospect.

This invention discloses a nickel-cobalt hydrometallurgical recycling process, belonging to the field of hydrometallurgical technology. On one hand, this invention converts magnesium sulfate solution wastewater into magnesium salt solution, replacing sodium hydroxide in saponification with the organic phase, while also saving water in the production line. It also recycles carbon dioxide waste gas, achieving resource conversion and reuse of industrial waste gas. On the other hand, it prepares functional materials to achieve efficient recovery of cobalt and nickel from waste liquid: utilizing Zn... 2+ Coordination activation forms a resin filter membrane with a coordination trap on its surface, which efficiently captures cobalt and nickel ions in waste liquid; a carboxyl-functionalized dimethylglyoxime ligand is pre-synthesized using dimethylglyoxime and bromoacetic acid, and a MOF with a dimethylglyoxime group is directly constructed for chelating Ni. 2+ The prepared adsorption particles undergo secondary adsorption in the waste liquid after passing through the resin, resulting in an extremely high recovery rate of cobalt and nickel ions in the waste liquid. This hydrometallurgical process achieves both recovery and recycling.

The application discloses a kind of reworkable and self-repairing polyurethane solid-solid phase change material and preparation method thereof, comprising: under argon or nitrogen atmosphere, polyethylene glycol is added to reactor for water removal treatment, under certain temperature and stirring speed, diisocyanate is dissolved in solvent and then added to reactor, catalyst is added, and pre-polymer is obtained by reaction;Temperature is adjusted, butanedione oxime and metal compound are dissolved in solvent respectively and then added to reactor, continue to react, pentaerythritol is dissolved in solvent and then added to reactor, and polyurethane solution is obtained by stirring;Polyurethane solution is poured into polytetrafluoroethylene mold, dried in oven, and reworkable and self-repairing polyurethane solid-solid phase change material is obtained.The oxime-urethane bond, metal coordination bond and hydrogen bond are introduced into the polyurethane solid-solid phase change material, and the obtained polyurethane solid-solid phase change material not only has good phase change performance and mechanical properties, but also has reworkability and self-repairing performance.

This application belongs to the technical field of polyurethane compositions, specifically providing a self-healing polyurethane composition and its preparation method. The composition is obtained by mixing the following raw materials in parts by weight: 50-60 parts polycaprolactone diol, 15-20 parts isocyanate, 0.5-2 parts leveling agent, 1-2 parts light stabilizer, 20-30 parts composite solvent, 2-5 parts aliphatic-copper complex crystals, 5-8 parts dimethylglyoxime, and 0.01-0.05 parts catalyst. The aliphatic-copper complex crystals are obtained by crystallization of a mixture of hydrogenated castor oil and a copper complex. The self-healing polyurethane composition coating obtained by this application has the advantages of stain resistance, crack resistance, and resistance to folding and matte finish.

The invention provides a cobalt and nickel ion detection method which comprises the following steps: adding a buffer solution and dimethylglyoxime into a water sample for reaction, and adding lead ions and copper ions to obtain a water sample to be detected; the method comprises the following steps: putting a water sample to be detected into a stirring container, inserting a screen-printed electrode into the stirring container, adjusting parameters, and detecting cobalt and nickel ions in the water sample to be detected; wherein the adding sequence of the buffer solution and the dimethylglyoxime is not limited. According to the detection method disclosed by the invention, the regulation and control effect of an ammonia water buffer solution and the high selectivity of dimethylglyoxime are fully utilized, a screen-printed electrode is introduced, and a solution containing lead and copper ions is adopted for coating, so that an ingenious separation means and a masking mechanism are obtained, and effective distinguishing and accurate determination of cobalt and nickel ions are realized.

The self-repairing PU sequentially comprises a coating layer, a PU surface layer, a PU foaming layer and a base cloth layer from top to bottom, a polyurethane prepolymer, a catalyst and dimethylglyoxime (a metal chelating agent) are packaged in a PU foaming layer through a microsphere packaging technology, when the material is damaged, microspheres are broken to release repairing components, a cross-linking reaction between the prepolymer and active substances (such as water and polyhydric alcohols) is triggered under the illumination or heating condition, scratches or holes are rapidly filled, and the service life of the material is prolonged. Manual intervention is not needed in the repairing process, and only external conditions (such as light / heat) are needed.

The invention belongs to the technical field of precious metal preparation, and particularly relates to dinitro di (dimethylglyoxime) iridic acid as well as a preparation method and application thereof. The preparation method comprises the following steps: adding sodium carbonate into an iridium source solution, and adjusting the pH value of the solution to 6-7; heating the solution to 60-90 DEG C, reacting for 2-6 hours, heating to 90-120 DEG C, slowly dropwise adding a sodium nitrite aqueous solution into the solution, and reacting for 4-8 hours; and heating the obtained hexanitroso sodium iridate solution to boiling, adding dimethylglyoxime and a stabilizer into the solution, reacting for 10-20 hours to obtain a dinitro di (dimethylglyoxime) iridic acid solution, and acidizing and freeze-drying to obtain the yellow crystal. The dinitro-bis (dimethylglyoxime) iridic acid prepared by the method is single in crystal form, the prepared gasoline car three-way catalyst can improve the low-temperature light-off activity of NOx, and the gasoline car three-way catalyst has high catalytic property, high stability and better durability.

The preparation method of the nitrate reduction electrocatalyst disclosed in the application comprises the following steps: preparation of a copper complex precursor, preparation of nitrogen-sulfur double-doped carbon loaded copper nanosheet Cu / NSC, and preparation of nitrogen-sulfur double-doped carbon loaded copper oxide nanosheet catalyst CuO / NSC. The copper complex precursor is obtained through a simple coordination reaction, and the copper oxide nanosheet catalyst is obtained through high-temperature calcination. The preparation method is simple, realizes the coordination of dimethylglyoxime and Cu 2+ , and the prepared copper oxide nanosheet catalyst has a large specific surface area and a large number of reaction active sites, has significant activity for nitrate reduction reaction, and has high stability, solving the problem that Cu-based electrocatalysts are deactivated due to passivation, leaching and corrosion after long-term use. Meanwhile, the introduction of the carbon carrier enhances the enrichment of the catalyst to NO3 ‑ and intermediates, and improves the rate of nitrate reduction reaction.

The invention belongs to the technical field of chromatographic detection, and particularly discloses a detection method of dimethylglyoxime. The method comprises the following steps: preparing a dimethylglyoxime solution with gradient concentration, carrying out gas chromatography detection, and drawing a standard curve according to a detection result and the concentration of the dimethylglyoxime solution; mixing a sample to be detected containing dimethylglyoxime with a solvent, performing gas chromatography detection under the same condition, and calculating the content of dimethylglyoxime according to the standard curve. According to the test method disclosed by the invention, dimethylglyoxime and dimethylglyoxime can be effectively separated, errors caused by dimethylglyoxime are avoided, the detection precision is improved, the operation is simplified, the detection time is shortened, and the detection efficiency is improved.

The application relates to a photocatalytic hybrid system based on a cobalt oxime molecular catalyst and application thereof, and belongs to the field of energy materials and catalysis technology. The cobalt oxime catalyst is synthesized by an organic method, and is obtained by adding cobalt chloride hexahydrate and butanedione oxime in an acetone solution, stirring at normal temperature, taking the precipitate, and stirring at normal temperature after adding 4-methoxypyridine to obtain the catalyst. The photocatalytic hybrid system is constructed by taking semiconductor powder bismuth vanadate as an optical component, sodium persulfate as a sacrificial electron acceptor, and the cobalt oxime molecular catalyst as a water oxidation catalyst. In a water solution with pH=7, oxygen is successfully generated after 3h of light irradiation, and the oxygen generation rate is 2099.9 mu mol g ‑1 h ‑1 , which is 2.5 times that of the system without the cobalt oxime. In three-cycle photocatalytic tests, the catalyst shows good stability. The catalyst is simple to synthesize, cobalt is abundant in the earth's crust, and has wide application prospects in the fields of renewable energy production and environmental protection.

The invention belongs to the technical field of photocatalytic functional materials, and discloses a foamed nickel-based bionic nanoneedle catalyst as well as a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: self-assembling bionic nanoneedles on the surface of foamed nickel in situ, removing stains on the surface of the foamed nickel, then carrying out ultrasonic cleaning in hydrochloric acid to remove surface oxides, and carrying out vacuum drying to obtain surface-activated foamed nickel; soaking the surface-activated foamed nickel into a mixed solution of dimethylglyoxime, an organic solvent and hydrochloric acid, carrying out ultrasonic treatment, carrying out self-assembly reaction at 25-80 DEG C, and then sequentially cooling, washing and drying to obtain the nickel-based composite material. The bionic nanoneedle catalyst is synthesized on the surface of the foamed nickel through in-situ self-assembly, catalytic sites are exposed abundantly by adjusting the aspect ratio and sharpness of the nanoneedle structure, and the bionic nanoneedle catalyst shows excellent activity and stability in the aspects of dynamic capture and photocatalytic killing of biological aerosol particles.

The invention provides a production method of dimethylglyoxime, and belongs to the technical field of compound production. The method comprises the following steps: firstly, adding a catalyst into a reaction kettle, then pumping 2, 3-butanedione, a solvent, a hydrogen peroxide solution and ammonia water for reaction, discharging a reaction solution from a discharge port of the reaction kettle, and pumping the reaction solution into a stripping tower for rectification separation to obtain a solvent and a dimethylglyoxime crude product; and washing the dimethylglyoxime crude product in a washing tank, and drying to obtain a dimethylglyoxime finished product. According to the method, the selectivity of raw material reaction during preparation of dimethylglyoxime is improved, continuous production is realized, industrialization is facilitated, and the method has a relatively great application prospect.

The application relates to the technical field of fertilizers, and discloses a coating material, a preparation method and application in a trace element coating for potassium chloride particles. The preparation method comprises the following steps: preparing a polyurethane prepolymer by reacting isophorone diisocyanate with polycaprolactone diol, tartaric acid and butanedione oxime; continuously reacting the polyurethane prepolymer with chitosan oligosaccharide Schiff base to obtain chitosan oligosaccharide modified polyurethane; and mixing the chitosan oligosaccharide modified polyurethane, a crosslinking agent, silane modified isocyanate and a trace element solution to obtain the coating material. The coating material has good mechanical properties, contains trace elements, has a controlled release effect on potassium chloride particle fertilizers, and can be applied as a trace element coating in potassium chloride particle fertilizers.

The application discloses a high-pressure boiler in-furnace water treatment agent and a boiler cleaning method. The high-pressure boiler in-furnace water treatment agent comprises scale treatment agent A, pickling treatment agent B and oxidation passivation treatment agent C used in steps; the scale treatment agent A comprises phosphate, dimethylglyoxime, ammonia water and deionized water; the pickling treatment agent B comprises EDTA, nitric acid, corrosion inhibitor and deionized water; the oxidation passivation treatment agent C comprises hydrogen peroxide, ammonia water and deionized water; the boiler cleaning method comprises steps of scale and rust cleaning, pickling, oxidation treatment, periodical treatment and drying. The application forms a comprehensive passivation effect on the inner wall of the boiler, which is firm, uniform, dense and covers an area of more than 98%, avoids the corrosion battery reaction caused by the unevenness of the existing rust removal and passivation treatment from the root, greatly reduces the possibility of corrosion, rust and scale formation on the inner wall of the boiler, greatly reduces the boiler cleaning frequency and reduces the boiler maintenance cost.

The application relates to the technical field of sodium ion battery electrode materials, in particular to a composite material containing bismuth-nickel bimetallic selenide and a preparation method and application thereof. The preparation method is as follows: taking a rod-shaped copper nickel diketone precursor with unstable structure as a nickel source under high-temperature pyrolysis, carrying out a hydrothermal reaction on the nickel source with a bismuth source, and then carrying out selenization treatment on the bismuth source and selenium in an inert atmosphere through a gas phase deposition mode, so that the bismuth-nickel bimetallic selenide composite material with two-dimensional nano-plate loaded nano-particles can be obtained after being cooled to room temperature. The method fully utilizes the low thermal stability of nickel diketone oxime, realizes the conversion of the rod-shaped-porous-small nano-particles in the pyrolysis-selenization process, and is favorable for the final uniform wrapping on the surface of the bismuth selenide nano-plate. The raw materials used in the method are cheap and rich in sources, the production cycle is short, and the stability is good. Meanwhile, the complementarity of the working potentials of the two components in the sodium storage process can also realize the efficient sodium storage in the whole voltage range.

This invention provides a method for producing dimethylglyoxime, belonging to the field of compound production technology. The method involves first adding a catalyst to a reaction vessel, then pumping in 2,3-dimethylglyoxime, a solvent, hydrogen peroxide solution, and ammonia to react. The reaction solution is discharged from the reaction vessel outlet and pumped into a stripping tower for distillation separation, yielding the solvent and crude dimethylglyoxime. The crude dimethylglyoxime is then washed and dried in a washing tank to obtain the finished dimethylglyoxime. This invention improves the selectivity of the raw material reaction during the preparation of dimethylglyoxime and enables continuous production, which is beneficial for industrialization and has significant application prospects.

The present invention relates to a method for preparing a compound of the formula (I) wherein R1, R2 and R3 are as defined in the claims and the description, by subjecting a compound of the formula (II) to a double-bond isomerization reaction in the presence of hydrogen and a cobalt dimethylglyoxime catalyst.

The invention discloses polyurethane and a preparation method and application thereof.The preparation method comprises the steps that a first reactant and water-removed polytetrahydrofuran are mixed and stirred for 0.5-3 h, then dibutyltin dilaurate is added and stirred for 2-4 h, a first reaction system is obtained, adipic acid dihydrazide and dimethylglyoxime serve as chain extenders, and a second reaction system is obtained; uniformly dispersing the second reactant and a chain extender in N, N-dimethylformamide to obtain a mixed solution, dropwise adding the mixed solution into the first reaction system in a stirring state, and carrying out a polymerization reaction to obtain a viscous liquid containing polyurethane. The preparation method of the polyurethane is based on a pre-polymerization-chain extension method, the polyurethane is subjected to specific sequence length and dynamic bond sequence distribution design, the mechanical property and the recoverability of the polyurethane are remarkably improved, the stability of aramid fibers in an aramid fabric is combined, and the recycling performance of the polyurethane is improved. And the multi-time cyclic reprocessing of the polyurethane fabric stab-resistant composite material is realized.