33 results about "Hydroxylamine sulfate" patented technology

The present invention relates to an iron ore reverse flotation inhibitor and a preparation method thereof. In the first step, a mixture of the following components by weight is reacted at 40°C to 50°C for 1 to 6 hours to obtain an auxiliary agent (1): 100 parts of corn starch, mung bean starch, or potato starch, 0.5 to 4.0 parts of sodium hydroxide or sodium ethoxide, 5 to 15 parts of methyl chloroacetate, and 5 to 15 parts of hydroxylamine hydrochloride or hydroxylamine sulfate. In the second step, a mixture of the following components by weight is reacted at 20°C to 50°C for 1 to 3 hours to obtain a finished inhibitor: 100 parts of the auxiliary agent (1) obtained in the first step and 1 to 12 parts of sodium hypochlorite. The inhibitor has strong inhibitory ability, selectivity, and low-temperature adaptability and can be used for room-temperature flotation.

A method for preparing an aqueous hydroxylamine solution belongs to the technical field of hydroxylamine preparation. Specifically, the method comprises adding an aqueous hydroxylamine sulfate solution to a raw material supply chamber, adding an aqueous sodium hydroxide solution to an alkali supply chamber, adding weakly alkaline water to a desalting chamber, adding a sulfuric acid solution to a concentrating chamber, circulating the sodium hydroxide solution between the anodic and cathodic chambers, and performing electrodialysis at room temperature to prepare the aqueous hydroxylamine solution. Furthermore, a method for preparing a stabilizer is provided, which can improve the stability of the aqueous hydroxylamine solution and reduce the damage to the hydroxylamine by metal ions.

The invention discloses a preparation method of a novel boiler deoxidant, and belongs to the technical field of chemical synthesis. The invention provides a preparation method of a novel boiler deoxidant, which comprises the following steps of: dehydrating isochromanone serving as a raw material and hydroxylamine sulfate in a solvent (water, ethanol or methanol) under an acidic condition to generate isochromanone oxime, and mixing the isochromanone oxime with other oximes, a dispersing agent and the like in parts by weight to prepare the required boiler deoxidant. The deoxidant is prepared from 3 to 5 parts of isochroman ketoxime, 12 to 16 parts of acetoxime, 12 to 14 parts of acetaldoxime, 8 to 12 parts of carbohydrazide, 4 to 7 parts of a dispersant, 5 to 10 parts of a pH regulator, 5 to 10 parts of a catalyst and 40 to 50 parts of water, wherein the other raw materials are prepared from 3 to 5 parts of isochroman ketoxime, 12 to 16 parts of acetoxime, 12 to 14 parts of acetaldoxime, 8 to 12 parts of carbohydrazide, 4 to 7 parts of a dispersant, 5 to 10 parts of a pH regulator, 5 to 10 parts of a catalyst and 40 to 50 parts of water. According to the preparation method, boiler pipelines, equipment and the like can be passivated while low toxicity, high efficiency and high speed can be guaranteed, equipment corrosion damage caused by metal oxide deposition of a boiler is prevented, and the product is non-toxic, harmless and mild to the environment.

The invention belongs to the technical field of organic synthesis, and particularly relates to a chloroamine synthesis method which comprises the following steps: S1, mixing a hydroxylamine sulfate aqueous solution and methyl acetate, and then dropwise adding a NaOH aqueous solution to react for 1-2 hours; s2, adding trans-1, 3-dichloropropene and the sulfonated niobium-doped TS-1 molecular sieve, uniformly mixing, heating to 60-70 DEG C, and carrying out etherification reaction for 5-6 hours to generate an intermediate product; s3, adding hydrochloric acid into the intermediate product, fully stirring, and carrying out reflux reaction at 60-70 DEG C for 2-3 hours; s4, organic matter is separated through reduced pressure distillation, then a NaOH aqueous solution is added to adjust the pH to be larger than 9, extraction is conducted, the extraction agent is removed through reduced pressure distillation, and chloramine is obtained. According to the synthesis method provided by the invention, the selectivity of the chloro-amine is 99% or above, the yield of the chloro-amine is 98% or above, the production efficiency of the chloro-amine can be effectively improved, and the synthesis method is suitable for industrial application.

The invention provides a synthesis method of 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole, which comprises the following steps: mixing isovaleric acid with a catalyst, pumping the mixture and liquid chlorine into a mixer, uniformly mixing, and slowly introducing the mixture into a microchannel for reaction to obtain 2-chloroisovaleric acid; s2, uniformly mixing 2-chloroisovaleric acid in S1 with an acylation reagent, and slowly introducing the mixture into the microchannel for reaction to obtain 3, 3-dimethyl crotonyl chloride; adding hydroxylamine hydrochloride or hydroxylamine sulfate and a solvent into the 3, 3-dimethyl crotonyl chloride in the step S2 in a reaction kettle for dissolving, controlling the temperature of the system to be 0-30 DEG C while stirring, adding alkali in batches, and stirring for reaction to obtain 5, 5-dimethyl-3-isoxazolidinone; and S3, diluting the 5, 5-dimethyl-3-isoxazolidinone obtained in the step S3 and a chlorination reagent with a solvent respectively, and then pumping the diluted 5, 5-dimethyl-3-isoxazolidinone and the chlorination reagent into the microchannel reactor respectively for reaction to obtain the 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole. In the production process, tail gas is single in component and convenient to treat, and environmental protection pressure is small; meanwhile, the used main raw materials are bulk and cheap chemicals, so that the production cost is lower.

A method for co-producing caprolactam and hydroxylamine sulfate comprises: (1) ammoximation reaction: ketone, ammonia and hydrogen peroxide are reacted at a certain temperature under the action of a titanium silicon catalyst to produce an oxime solution; (2) hydrolysis reaction: caprolactam sulfate is added with an appropriate amount of desalted water, stirred, and the hydrolysis temperature is controlled to carry out a hydrolysis reaction to obtain a hydrolysis reactant caprolactam sulfuric acid solution; (3) co-production reaction of caprolactam and hydroxylamine sulfate: oxime solution is added to step (3), and the reaction is carried out at a certain temperature and pressure to obtain caprolactam and hydroxylamine sulfate solution; (4) physical separation: the reactants in step (3) are separated into layers, the upper layer is a light phase, which is an organic solvent containing caprolactam, and the lower layer is a heavy phase, which is an aqueous phase containing hydroxylamine salt; (5) the organic solvent containing ketone is returned to step (1) for ammoximation reaction, or after the solvent is removed, it is returned to step (1) for ammoximation reaction; the lower layer is subjected to sedimentation, centrifugal separation, and drying to obtain a crude caprolactam solution and hydroxylamine sulfate salt. The invention has the advantages of simple process, combining the production of caprolactam with the production of hydroxylamine salt, reducing the by-product of ammonium sulfate, and producing caprolactam and hydroxylamine salt at the same time.

The present disclosure provides methods, compounds, and compositions for treating industrial streams. A method of treating a stream may include adding a scavenger to the stream and adding an amine to the stream. The stream may include an acid gas and / or a carbonyl-containing compound. The scavenger may include, for example, sodium borohydride, hydroxylamine sulfate, acetaldehyde oxime, sodium cyanoborohydride, or any combination thereof. The amine may include, for example, ethylene diamine, ethyl ethanolamine, diethyl monoethanolamine, or any combination thereof.

The invention provides 1, 5-diaminonaphthalene and a preparation process thereof, and the 1, 5-diaminonaphthalene is prepared from the following raw materials in parts by weight: 90-100 parts of 1-nitronaphthalene, 5-15 parts of a difunctional composite catalyst, 120-180 parts of hydroxylamine sulfate, 30-60 parts of ammonia water (the concentration is 25-28%), 250-350 parts of N-methyl pyrrolidone (NMP), 50-150 parts of isopropanol, 1-3 parts of sodium pyrophosphate and 2-5 parts of sodium citrate. Wherein the bifunctional composite catalyst is a nickel-cobalt-cerium / magnesium-aluminum composite oxide. According to the invention, the synergistic effect of all the components can improve the preparation efficiency and selectivity of 1, 5-diaminonaphthalene, and meanwhile, the stability of the reaction process is optimized.

An electroless ruthenium plating bath contains at least a ruthenium compound, a reducing agent, and a stabilizer. The reducing agent is hydrazines. The stabilizer includes a hydroxylamine compound and an organic compound having a hydroxyl group. The hydroxylamine compound is either or both of hydroxylamine sulfate and hydroxylamine chloride. The organic compound having a hydroxyl group is at least one selected from the group consisting of gluconolactone, sorbitol, mannitol, and citric acid monohydrate.

The invention discloses a method for removing copper and extracting selenium from copper anode slime, which comprises the following steps: leaching copper and selenium: mixing the copper anode slime, an acid solution containing sulfate radicals and an oxidizing agent to obtain a pulpified material, and leaching under the ultrasonic conditions that the reaction temperature is 50-80 DEG C and the ultrasonic power is 200-800 W to obtain a copper-selenium-rich solution and copper-selenium-removed slag, the oxidizing agent is 2KHSO5. KHSO4. K2SO4, and the pH value of the oxidizing agent is 7. A selenium precipitation agent is added into the copper-selenium-rich liquid, a reduction reaction is carried out under the ultrasonic conditions that the reduction temperature is 30-75 DEG C and the ultrasonic power is 150-600 W, selenium precipitation is carried out, crude selenium and copper-selenium-rich liquid are obtained, and the selenium precipitation agent is selected from at least one of hydroxylamine sulfate, hydroxylamine and hydroxylamine hydrochloride. According to the method, copper is separated from the copper anode slime and selenium is extracted from the copper anode slime only through a two-step method, the overall process is short, reaction conditions are mild, the treatment time is short, the operation environment is good, and energy consumption is low.

The invention discloses an environment-friendly low-slag low-consumption phosphating solution and a preparation method thereof, and belongs to the technical field of metal surface anti-rust treatment solutions. The corrosion inhibitor comprises the following chemical components in percentage by mass: 8-13% of zinc oxide, 8-12% of nitric acid, 17-25% of phosphoric acid, 0.5-0.8% of citric acid, 0.3-0.5% of hydroxylamine sulfate, 0.3-0.5% of sulfamic acid and the balance of water. The method comprises the steps of preparing zinc oxide turbid liquid; preparing a zinc salt solution; and preparing a finished product phosphating solution. The method has the advantages that invalid consumption of phosphate ions can be reduced from the source; the compactness and the anti-rust performance of the zinc-series phosphating film can be guaranteed, meanwhile, a large amount of sediment brought by nitric acid serving as a strong oxidant is avoided, and the total nitrogen content can be lower than 70 mg / L; the spontaneous precipitation of free zinc ions and phosphate ions can be inhibited, and the ion balance effect of the system can be well maintained.

The application discloses a flotation collector for sulfur-oxygen mixed zinc ore, and a structural general formula of the collector is shown in the following formula: wherein R is a C1-C5 hydrocarbon group; a preparation method of the collector comprises the following steps: adding 0.1 mol of acrylonitrile and 0.1 mol of amine into a reaction bottle, stirring uniformly, slowly and dropwisely adding 0.11 mol of carbon disulfide at 0-20 DEG C, adding 20 mL of water and hydroxylamine sulfate after stirring for 1 h at normal temperature, stirring for 15 min, adding a certain amount of alkali, and synthesizing a reaction for 2-6 h at 30-70 DEG C; and the lower water layer is removed, and the upper organic layer is the sulfur-oxygen mixed zinc ore collector ZJOS-1, which can simultaneously and efficiently float and recover zinc sulfide ore and zinc oxide ore in a same tank, and has the advantages of simplifying a flotation process and reducing equipment investment.

The invention discloses a green preparation process of capryloyl hydroxamic acid, and relates to the technical field of fine chemical synthesis. The environment-friendly preparation process of the capryloyl hydroxamic acid at least comprises the following preparation steps: mixing and stirring hydroxylamine sulfate, sodium hydroxide and ethanol, dropwise adding ethyl caprylate, and carrying out oximation reaction to obtain a reaction mixed system; reducing the temperature of the reaction mixed system, dropwise adding concentrated sulfuric acid to adjust the pH value to 6-7, and performing solid-liquid separation to obtain sodium sulfate and capryloyl hydroximic acid mother liquor; and carrying out rotary evaporation on the capryloyl hydroxamic acid mother liquor to recover the ethanol, and carrying out fractional crystallization to obtain the capryloyl hydroxamic acid. The green preparation process of capryloyl hydroxamic acid provided by the invention has the advantages of high raw material utilization rate, strong solvent recycling reusability, high product molar yield, high purity, good chroma, light smell, good corrosion resistance, continuous production, no three wastes in the process, low temperature and normal pressure, safety, green and energy saving, and accords with the green chemical engineering concept of carbon neutralization.

The present disclosure provides methods, compounds, and compositions for treating industrial streams. A method of treating a stream may include adding a scavenger to the stream and adding an amine to the stream. The stream may include an acid gas and / or a carbonyl-containing compound. The scavenger may include, for example, sodium borohydride, hydroxylamine sulfate, acetaldehyde oxime, sodium cyanoborohydride, or any combination thereof. The amine may include, for example, ethylene diamine, ethyl ethanolamine, diethyl monoethanolamine, or any combination thereof.

The present invention relates to an additive concentrate useful for scavenging hydrogen sulphide and organic compounds, comprising monoethanolamine triazine and / or monomethylamine triazine and at least one salt chosen from alkali metal bisulfites, alkali metal metabisulfites and hydroxylamine sulfate. The invention also relates to a composition comprising said concentrate additive and a liquid vehicle, as well as the use of the additive concentrate or of the composition of the invention for scavenging hydrogen sulphide and / or organic compounds comprising at least one sulfhydryl group in a liquid or gaseous stream.

The present invention belongs to the field of organic synthesis technology and specifically relates to a method for synthesizing benzohydroxamic acid, comprising: 1) an oximation step: mixing methyl benzoate, hydroxylamine sulfate, a phase transfer catalyst, a defoaming agent, and water, adding a base, and conducting an oximation reaction at 25-42°C to obtain an oximation system; 2) an acidification step: adding concentrated sulfuric acid to the oximation system and conducting an acidification reaction to obtain an acidified system; and 3) a crystallization step: cooling the acidified system to 20-25°C, crystallizing, and filtering to obtain benzohydroxamic acid crystals. The benzohydroxamic acid product prepared by the present invention has a high yield and a purity of up to 99%, and can be directly used as a mineral flotation agent. Furthermore, the present invention has the advantages of stable production indicators, simple process control, and low cost. Furthermore, the use of water as a solvent makes it non-toxic and environmentally friendly.

The present invention relates to a method for scavenging hydrogen sulphide and / or organic compounds comprising at least one sulfhydryl group in a liquid or gaseous stream, comprising contacting said stream a composition comprising: - monoethanolamine triazine and / or monomethylamine triazine, and - at least one salt chosen from alkali metal bisulfites, alkali metal metabisulfites and hydroxylamine sulfate, wherein the weight ratio between the total amount of monoethanolamine triazine and / or monomethylamine triazine and the total amount of said salt(s) lies within the range from 1:1 to 100:1. The present invention also concerns an additive composition useful for scavenging hydrogen sulphide and organic compounds.

The application discloses a flexible wearable bifunctional colorimetric gas sensor patch as well as a preparation method and application thereof, and belongs to the field of sensors. The bifunctional colorimetric gas sensor patch uses thymol blue and hydroxylamine sulfate as response materials, and is designed as a high-sensitivity, low-cost and wide-range sensor, which can simultaneously detect acetone gas in a range of 1-40 ppm and HCl gas in a range of 100-900 ppm. The color data collected by the sensor can be converted into gas concentration by using a deep neural network, so that the precise gas concentration detection function is realized, and real-time gas leakage monitoring and early warning can be realized on a site such as a chemical working site.

This application provides a method for phase analysis of manganese in ores, belonging to the field of phase analysis of ores. The method involves weighing an ore sample and sequentially leaching it with silver nitrate solution to separate the manganese sulfate phase; then leaching it with aluminum nitrate solution under heating, adding a mixed solution of isoamyl alcohol and isoamyl acetate as a first inhibitor to separate the manganese carbonate phase; followed by stepwise leaching with sulfurous acid solution and hydroxylamine sulfate-sulfuric acid solution, adding a mixed solution of n-butanol and ethyl acetate as a second inhibitor to separate the manganese oxide phase; and finally, the remaining residue is digested by ashing to obtain the silicate phase. The manganese content of each phase digest is determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). This application rationally selects various possible forms of manganese in the ore and scientifically selects the leaching agent for each phase, ensuring that the leaching agent of the previous phase does not leach manganese from the subsequent phases, thus guaranteeing accurate determination of each phase.

The purpose of the present invention is to provide an electroless ruthenium plating bath in which hydrazine is used as a reducing agent, said electroless ruthenium plating bath being capable of improving bath stability, having excellent ruthenium deposition properties, and being capable of suppressing shrinkage of a coating film during annealing treatment. The electroless ruthenium plating bath at least contains a ruthenium compound, a reducing agent and a stabilizing agent, the reducing agent is hydrazine, the stabilizing agent is composed of a hydroxylamine compound and an organic compound with hydroxyl, and the hydroxylamine compound is at least one of hydroxylamine sulfate and hydroxylamine chloride; the organic compound having a hydroxyl group is at least one selected from the group consisting of gluconolactone, sorbitol, mannitol, and citric acid monohydrate.

The invention relates to the technical field of positive lead paste of lead-acid storage batteries, and particularly discloses positive lead paste of a valve-regulated sealed lead-acid storage battery and a preparation method of the positive lead paste. Functional components such as stannous sulfate, antimonous oxide, graphite, a silicon dioxide dispersion liquid and hydroxylamine sulfate are added, the weight ratio of all the components is precisely regulated and controlled, all the additive components have a synergistic effect, graphite constructs a low-resistance conductive network, nano-silicon dioxide inhibits softening of lead plaster, short fibers reinforce structural stability, and hydroxylamine sulfate reduces vulcanization of a polar plate. According to the invention, the core problems of poor low-temperature charge-discharge performance, easy falling of active substances, short cycle life and the like of the valve-regulated sealed lead-acid storage battery in a low-temperature energy storage scene are solved, and meanwhile, the valve-regulated sealed lead-acid storage battery is compatible with the existing industrial production process and has remarkable technical advantages and application value.

The application discloses a preparation of a fatty hydroxamic acid for spodumene collector and the collector and application thereof, wherein a carboxylic acid compound and anhydrous ethanol are stirred and mixed at normal temperature, concentrated sulfuric acid is added dropwise under the stirring condition at normal temperature, the reaction is carried out after the concentrated sulfuric acid is added dropwise, and oil-water separation is carried out after the reaction is completed to obtain a carboxylic acid ester compound; hydroxylamine sulfate and water are added to the carboxylic acid ester compound, the mixture is stirred and dissolved at normal temperature, and then alkali is slowly added under the stirring condition at normal temperature, after which the reaction is carried out after being heated, the reaction is neutralized to weak acidity by using dilute hydrochloric acid after being completed, and the water phase is separated to obtain a brown solution, which is the fatty hydroxamic acid. The fatty hydroxamic acid, a fatty acid soap, a polyethylene glycol antifreezing agent and an emulsifier are obtained according to a proportion to obtain the spodumene collector. The spodumene collector has good selectivity for spodumene ore and strong collecting capacity.

This invention discloses a process for preparing high-purity hydroxylamine by electromagnetic microwave-driven hydroxylamine salt pyrolysis and sublimation. The process specifically involves: adding a reducing boron salt to an aqueous solution of hydroxylamine salt; reducing metal ions in the hydroxylamine salt under microwave conditions; then adsorbing the metal ions through an electromagnetic field; concentrating, crystallizing, and centrifuging to obtain hydroxylamine salt with a metal impurity content of less than 100 ppb; subsequently, the hydroxylamine salt undergoes low-temperature pyrolysis and sublimation under vacuum and electromagnetic microwave action to obtain hydroxylamine crystals with a metal impurity content of less than 0.1 ppb, with a sublimation yield ≥85%. These hydroxylamine crystals are dissolved in ultrapure water to obtain an aqueous solution of hydroxylamine with a metal impurity content of less than 0.1 ppb. This invention utilizes the synergistic effect of microwaves and electromagnetic fields to generate hydroxylamine crystals through pyrolysis and sublimation at a relatively low reaction temperature with high selectivity, achieving safe and efficient results with a single-pass yield of not less than 85% from the electromagnetic microwave-driven pyrolysis and sublimation of hydroxylamine sulfate and hydroxylamine phosphate.

The application belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of Mupiravir. The selected synthesis route is simple in operation and simplifies the post-reaction treatment steps. After the reaction is completed, the organic phase is separated from the aqueous solution of hydroxylamine sulfate and sodium acetate, the recovery rate of the solvent can be maximized due to the absence of dangerous hydroxylamine sulfate, more importantly, the decomposition of hydroxylamine sulfate is avoided, the production safety is higher, the production is green and environmentally friendly, and the method is more suitable for the popularization of industrialized safe mass production.

The invention relates to a preparation method of a Fosmanogepix intermediate, and belongs to the technical field of organic chemistry. The preparation route is as follows. Comprising the following steps: (1) reacting 2-pyridinol with 4-bromomethylbenzaldehyde to obtain a compound as shown in a formula IV; (2) obtaining a compound as shown in a formula III from the compound as shown in the formula IV and hydroxylamine sulfate under the action of sodium hydroxide; (3) carrying out chlorination reaction on the compound shown in the formula III to obtain a compound shown in a formula II; and (4) reacting the compound as shown in the formula II with 3-acetylene pyridine-2-amine by taking triethylamine as a solvent to obtain the compound as shown in the formula I. The preparation method of the Fosmanogepix intermediate provided by the invention is mild in reaction condition, high-explosive and high-toxicity reagents such as nitromethane and titanium tetrachloride are not used, and meanwhile, high-risk processes such as hydrogenation reaction are avoided. Meanwhile, the product yield is increased, and when isoxazole is prepared through cyclization, triethylamine is adopted as a solvent, so that the single-step reaction yield is greatly increased.

The invention belongs to the technical field of organic synthesis, and particularly relates to a method for preparing 2-hydroxy-5-nonylbenzaldoxime based on microchannel continuous flow, which comprises the following steps: 1) respectively injecting an aqueous alkali solution and a hydroxylamine sulfate aqueous solution into a microchannel reactor I from two ports at the same time to obtain a mixed hydroxylamine solution; (2) simultaneously injecting 2-hydroxy-5-nonylbenzaldehyde and tert-butyl alcohol into the micro-channel reactor II from two ports respectively to obtain a refined aldehyde tert-butyl alcohol solution; and (3) respectively injecting the mixed hydroxylamine solution and the refined aldehyde tert-butyl alcohol solution into a microchannel reactor III from two ports at the same time, reacting at 55-155 DEG C for 20-255 seconds, obtaining a reaction product from an outlet of the microchannel reactor III, standing the reaction product, and splitting phases to obtain an upper organic phase I containing 2-hydroxy-5-nonylbenzaldoxime. The continuous synthesis of the 2-hydroxy-5-nonylbenzaldoxime is realized, the productivity is effectively improved, and the method is green and economical.

This invention discloses a method for preparing a biogenic vein containing venous valves, belonging to the field of biomedical functional technology. The method includes the following steps: cutting a porcine or bovine jugular vein containing intact valves, cleaning, disinfecting, and rinsing it for later use; sequentially performing cell lysis, cell digestion, and nucleic acid digestion; then immersing it in a 1 mol / L hydroxylamine sulfate solution for heparin covalent cross-linking; and finally immersing it in a treatment solution to obtain a biogenic vein containing venous valves. The treatment solution is a PBS solution containing 4 wt% hydroxyethyl starch and 0.1 wt% polyhexamethylene biguanide. The method for preparing a biogenic vein containing venous valves provided by this invention significantly solves the technical problems of insufficient dehydration and antibacterial activity mentioned in the background art by introducing a treatment solution containing 4 wt% hydroxyethyl starch and 0.1 wt% polyhexamethylene biguanide during the preparation process. Simultaneously, the valve function of the biogenic vein is significantly improved.

The invention discloses a preparation method of flake silver powder, which comprises the following steps: adding ammonia water into a silver nitrate solution to obtain a silver ammonia solution; adding stearic acid into the silver-ammonia solution to obtain a first mixed solution; and the first mixed solution and a hydroxylamine sulfate solution are added into a polyvinyl pyrrolidone solution containing copper nitrate, a primary stirring reaction is carried out, lauric acid is added for a secondary stirring reaction, cleaning, drying and powder mixing and ball milling are carried out, and then the flake silver powder is obtained. According to the invention, stearic acid and lauric acid are used for dual coating, copper nitrate is used for particle size adjustment, and stirring and ball-milling modes of a refining process are adopted, so that nucleation, growth and morphology of the flake silver powder are regulated and controlled, and the influence of environmental fluctuation on the quality of the silver powder is overcome; the prepared flake silver powder is high in morphology regularity, concentrated in particle size distribution, excellent in dispersity and small in batch difference, and then the tap density and the surface activity of the silver powder are improved.

The invention provides a preparation method of an amidoxime functionalized metal organic framework as well as a product and application of the amidoxime functionalized metal organic framework, the method comprises the following steps: (1) mixing 2, 5-dibromoterephthalic acid, a zirconium source and a coordination regulator in a solvent, and reacting to obtain a metal organic framework UiO-66-2Br; (2) mixing the UiO-66-2Br and a cyanation reagent in a solvent, and reacting to obtain a metal organic framework UiO-66-2CN; (3) mixing the hydroxylamine salt, an alkaline reagent and UiO-66-2CN in a solvent, and reacting to obtain an amidoxime functionalized metal organic framework UiO-66-2AO; the hydroxylamine salt comprises any one or a combination of at least two of hydroxylamine nitrate, hydroxylamine sulfate or hydroxylamine oxalate. The UiO-66-2AO has high adsorption capacity for uranyl ions in a wide pH range, and efficient separation of rare earth ions and uranyl ions is achieved.

The invention discloses a flexible wearable difunctional colorimetric gas sensor patch as well as a preparation method and application thereof, and belongs to the field of sensors. Thymol blue and hydroxylamine sulfate are used as response materials, the sensor with high sensitivity, low cost and wide range is designed, and acetone gas in the range of 1-40 ppm and HCl gas in the range of 100-900 ppm can be detected at the same time. According to the invention, the color data collected by the sensor can be converted into the gas concentration by adopting the deep neural network, so that an accurate gas concentration detection function is realized, and real-time gas leakage monitoring and early warning can be carried out on places such as a chemical work station and the like.