351 results about "Sodium thiosulfate" patented technology

The invention discloses an organic plugging agent, a preparation method thereof and application of the organic plugging agent to inhibition of SAGD steam cavity edge water invasion. The organic plugging agent is prepared from the following raw materials: epoxy resin, a curing agent, nano aerogel, mineral fibers, plant fibers, a reactive diluent, a heat stabilizer and water, the epoxy resin is at least one of glycidyl amine epoxy resin and alicyclic epoxy resin; the curing agent is at least one of amino resin, dicyandiamide and hydrazide; the heat stabilizer is at least one of thiourea, sodium thiosulfate and cobalt chloride. The organic plugging agent is excellent in high temperature resistance, mineralization resistance and plugging performance, the organic plugging agent, nitrogen and an inorganic plugging agent are injected into a water plugging system of an SAGD steam cavity edge well in a slug mode, the organic plugging agent is applied to SAGD high-temperature and high-leakage well conditions, and the SAGD production effect can be effectively improved.

The invention provides a purification and impurity removal method of a crude nickel-cobalt-manganese sulfate solution. The purification and impurity removal method comprises the following steps: (1) adding sodium thiosulfate into the crude nickel-cobalt-manganese sulfate solution to remove copper; (2) phosphate is adopted, the pH value is regulated, and titanium, iron, aluminum and the like are removed; (3) ferric sulfate is added, the pH value is regulated, and phosphorus and silicon are removed; (4) adding a bismuth agent and regulating the pH value to remove chlorine; (5) adding a fluorine agent to remove calcium and magnesium; and (6) adding a tillite mineral adsorbent to remove fluorine. According to the method, iron, aluminum, copper, fluorine, phosphorus, titanium, calcium, magnesium, chlorine, silicon and other elements can be efficiently removed from the rough nickel-cobalt-manganese sulfate solution, the loss of main metal is low, the prepared high-purity nickel-cobalt-manganese sulfate solution can directly meet the requirement of a precursor solution of a battery preparation level, the process is simple, the operation difficulty is low, industrial large-scale production is easy to achieve, and the method is suitable for industrial production. And the defects of the current preparation method of the high-purity nickel-cobalt-manganese sulfate solution are overcome.

The invention relates to the technical field of sewage treatment, and discloses a novel sulfur autotrophic denitrification filter material and a preparation method and application thereof.The particle size of the filter material is 3.0-4.0 mm, and the filter material is prepared from 40%-45% of a composite sulfur source, 70 + / -2% of sulfur and 30 + / -2% of sodium thiosulfate, 30%-35% of modified ceramsite, 50-100 [mu] m / 200-300 [mu] m of bimodal pore size and 8%-10% of a conducting medium. The ratio of graphene to biochar is 3: 1), a buffer medium (5%-7%, Fe2O3 (52% + / -2%), CaCO3 (31% + / -2%) and MgO (17% + / -2%), a binder and an inert filler. The preparation method comprises the steps of raw material pretreatment, mixing granulation, stepped calcination, gradient impregnation, buffer medium directional loading, post-treatment and the like. The filter material solves the problems of by-product accumulation, insufficient microbial adhesion, large pH fluctuation and blockage of a traditional filter material through gradient sulfur release, a three-dimensional electron transfer network, a multistage pore anti-blockage design and a composite pH buffer system, is suitable for sewage denitrification treatment, and is high in denitrification efficiency and good in stability.

The invention belongs to the technical field of ceramic materials, and particularly relates to a high-strength building ceramic material and a preparation method thereof. The high-strength building ceramic material is prepared from the following raw materials in parts by weight: 20 to 30 parts of potassium feldspar, 15 to 23 parts of kaolin, 37 to 45 parts of solid waste-based silicon carbide, 1 to 4 parts of talc, 3 to 8 parts of modified mullite whisker and 2 to 5 parts of filler, a preparation process of the modified mullite crystal whiskers comprises the following steps: (1) adding mullite crystal whiskers into an ethanol water solution containing a silane coupling agent, and heating for reaction to obtain pretreated mullite crystal whiskers; and (2) adding the mullite whiskers pretreated in the step (1) into a nickel sulfate aqueous solution, then adding triethylamine and sodium thiosulfate, and carrying out a heating reaction to obtain the modified mullite whiskers. After the raw material components are combined, preparation of a high-strength ceramic material is facilitated, the heat conductivity coefficient can be increased, the heat conduction effect can be enhanced, and the ceramic material is suitable for common home decoration and high-heat-conductivity floor heating ceramic tiles.

The invention discloses a preparation method of an all-solid-state lithium-sulfur battery composite positive electrode, which comprises the following steps: weighing raw materials of sodium thiosulfate, hydrochloric acid and a conductive agent (such as one or more of graphene, carbon nanotubes, conductive carbon black and acetylene black) according to a certain proportion, stirring, precipitating, washing and drying to obtain a sulfur-carbon precursor; and performing mechanical ball milling on the precursor and an electrolyte according to a certain proportion, and grinding with a binder to obtain a composite positive electrode, and taking the composite positive electrode as the positive electrode of the all-solid-state lithium-sulfur battery. According to the invention, the problem of non-uniform lithium ion transmission caused by large particle size of active substance sulfur is solved, so that the utilization rate of the active substance is improved; meanwhile, the problem of non-uniform dispersion of the active substance sulfur and the conductive agent carbon is solved, so that the cycle stability of the battery is improved; in addition, the addition of the binder enhances the contact of each component in the composite positive electrode, thereby obtaining more excellent electrochemical performance.

The invention discloses a lead-free phosphorus chemical nickel plating solution, and relates to the field of chemical nickel plating, and the lead-free phosphorus chemical nickel plating solution comprises the following components: 6-10 g / L of nickel salt, 5-10 g / L of a complexing agent, 1-5 g / L of a brightener, 5-12 g / L of a reducing agent, 0.6-0.9 g / L of a composite stabilizer, 2-10 g / L of a plating starting agent, 0.1-0.6 g / L of a hydrogen evolution preventing agent and 30-60 mg / L of a surfactant. The adopted plating starting agent is high in decomposition capacity, after the service cycle is increased to 4 MTO, the problem that decomposition products are accumulatively increased to a certain degree to cause blackening of a plating layer can be relieved, 5-6 MTO can be achieved, meanwhile, the adopted composite stabilizer is a composition composed of an aminopyrrole carboxylic ester compound and an aminothiazole carboxylic ester compound, and the composite stabilizer has the beneficial effects of being environmentally friendly and free of pollution. The stability of traditional elements such as lead and cadmium can be improved, and the problem that the service cycle of stabilizers such as benzotriazole or sodium thiosulfate is short can be solved.

The invention relates to a preparation method of 1-methyl-5-hydroxypyrazole, which comprises the following steps: (a) methylation reaction: fully dissolving pyrazole in a reaction solvent a, dropwise adding a methylation reagent into the reaction solvent a to carry out methylation reaction, adding water into the reaction solvent a to carry out quenching reaction after the reaction is completed, fully washing and concentrating to generate 1-methylpyrazole; (b) bromination hydrolysis reaction: fully dispersing 1-methylpyrazole in a reaction solvent b, dropwise adding bromine into the reaction solvent b to perform bromination reaction, dropwise adding liquid caustic soda and a sodium thiosulfate solution into the reaction solvent b to perform quenching reaction after the reaction is completed, adding the liquid caustic soda into the reaction solvent b after extraction and concentration, and performing heating hydrolysis and cooling crystallization to obtain the 1-methyl-5-hydroxypyrazole. The preparation method of the 1-methyl-5-hydroxypyrazole is reasonable in design, not only reduces the isomer 1-methyl-3-hydroxypyrazole, but also avoids the use of liquid with pungent smell, such as ethylenediamine, and precursor reagents, such as methylhydrazine, improves the operation safety, is environment-friendly, and is beneficial to industrial production.

The invention discloses a high-temperature-resistant and salt-resistant fracturing fluid and a preparation method thereof, and relates to the technical field of oil field fracturing fluids. When the high-temperature-resistant and salt-resistant fracturing fluid is prepared, sodium 3-chloro-2-hydroxypropane sulfonate, N, N-dimethylacrylamide and ethylene glycol react to prepare a quaternized solid product, and then the quaternized solid product reacts with 1-bromooctadecane to prepare an amphoteric hydrophobic monomer; guar gum powder reacts with 3-(1-naphthyloxy)-1, 2-epoxypropane to prepare naphthyloxy functionalized guar gum, and then the naphthyloxy functionalized guar gum, acrylamide and an amphoteric hydrophobic monomer are subjected to initiated polymerization through ceric ammonium nitrate to prepare modified guar gum; enabling zirconium oxychloride octahydrate, titanium chloride, lactic acid, ethanediamine and glycerol to react to prepare an organic zirconium cross-linking agent; and finally, mixing the modified guar gum, an organic zirconium cross-linking agent, sodium thiosulfate, sodium bromate, a surfactant and water to prepare the high-temperature-resistant and salt-resistant fracturing fluid. The high-temperature-resistant and salt-resistant fracturing fluid prepared by the invention has excellent high-temperature resistance and salt resistance.

The invention discloses a method for preparing a sodium-rich boundary-rich iron-based prussian blue analogue (FePBA) through one-step hydrothermal synthesis assisted by sodium thiosulfate. The method specifically comprises the following steps: preparing a solution A and a Na4Fe (I I) (CN) 6 solution; the molar ratio of ferrocyanide to Fe ions in the solution B is 3: 4. And preparing a solution B to react with ferrocyanide to form FePBA. Adding sodium citrate to form a sodium and citrate-rich environment, then adding ferric iron salt, and fully stirring to chelate the added Fe < 3 + > with the citrate; and adding sodium thiosulfate after the step. Preparing a PVP (Polyvinyl Pyrrolidone) solution to play roles in dispersing FePBA and reducing agglomeration, and taking the PVP solution as a solution C; slowly dropwise adding the solution A and the solution B into the solution C at a constant speed by using a rubber head dropper to finally obtain a precursor solution, carrying out hydrothermal reaction for 6 hours at 110 DEG C, carrying out suction filtration on the obtained precipitate, and drying to obtain a FePBA sample. According to the invention, the time required for synthesis is greatly shortened, and the traditional coprecipitation of more than 24 hours is improved into rapid hydrothermal reaction of 6 hours.

The present invention provides an autotrophic denitrification filter material, comprising three types of materials A, B, and C, and the weight ratio of each material is A: B: C = (10-15): (1-2): 1, wherein A is a composite denitrification ingredient, including ferrous sulfide, sulfur, sodium thiosulfate and iron powder; B is an adhesive; and C is a molecular sieve treated with a microbial culture solution. The high efficiency of the autotrophic denitrification filter material with high efficiency denitrification provided by the present invention is mainly based on the following two options: first, the filter material belongs to a multivalent composite sulfide-iron coupling denitrification scheme, and the diverse electron donors of the autotrophic denitrifying bacteria have synergistic synergy; second, the autotrophic denitrifying bacteria culture solution is pre-placed in the gap of the molecular sieve, which can be slowly released, ensuring that the autotrophic denitrifying bacteria can still maintain growth when the environment is subjected to various shocks. The autotrophic denitrification filter material provided by the present invention has a simple preparation process, is easy to operate during application, and can maintain high efficiency in denitrification capacity.

The invention discloses a sulfur-doped nickel-cobalt-iron layered double hydroxide nanosheet array catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, nickel foam is subjected to surface modification, a NiCo LDH nanosheet array evenly distributed grows on the surface of the nickel foam, then the nickel foam is soaked in a solution containing iron ions and sodium thiosulfate, and an S-NiCoFe LDH nanosheet array is obtained; and the nickel-cobalt-based self-supporting OER electrocatalyst is prepared. The electrode material has the advantages that the three-dimensional porous self-supporting electrode does not need an organic adhesive or a supporting electrode; the raw materials are non-noble metals, low in price and wide in source. The obtained nickel-cobalt-based self-supporting electrode material shows good OER performance in 1mol / L KOH, the overpotential of the catalyst at 100mA / cm < 2 > is 283mV, and after 48h stability test, the performance of the catalyst is not obviously attenuated.

The invention relates to the technical field of water-soluble fertilizer production, in particular to a slow-release polyglutamic acid water-soluble fertilizer and a preparation method thereof. The slow-release type polyglutamic acid water-soluble fertilizer is prepared from the following raw materials in parts by mass: 2 to 10 parts of polyglutamic acid master batch, 18 to 28 parts of nitrogen fertilizer, 12 to 22 parts of phosphorus fertilizer, 15 to 20 parts of potassium fertilizer, 4 to 16 parts of medium trace elements, 9 to 15 parts of polyglutamic acid fermentation liquor and 35 to 60 parts of slow-release coating agent, the slow-release coating agent comprises the following raw materials in parts by mass: 6-13 parts of lecithin, 2-4 parts of sodium thiosulfate, 8-18 parts of vegetable oil and 19-40 parts of a zinc oxide-loaded cellulose / chitosan-based composite material; according to the slow-release type polyglutamic acid water-soluble fertilizer and the preparation method thereof, the polyglutamic acid water-soluble fertilizer is subjected to coating treatment, so that nutrients in the fertilizer can be slowly and continuously released, the effective supply time of the nutrients is prolonged, and the utilization rate of the fertilizer is increased.

The present invention discloses a treatment agent for inhibiting microbial corrosion of carbon steel pipelines in circulating cooling water and a method for using the same, and belongs to the technical field of treatment agents for circulating cooling water. The treatment agent for inhibiting microbial corrosion of carbon steel pipelines in circulating cooling water comprises a first treatment agent and a second treatment agent, wherein the first treatment agent comprises the following components: sodium thiosulfate, a surfactant, dithiothiomethane, an oxidant, and a first precipitant, sodium sulfide; the second treatment agent comprises the following components: sodium thiosulfate, a surfactant, dithiothiomethane, an oxidant, and a second precipitant. The present invention can form an anti-microbial corrosion layer on the surface of a carbon steel pipeline, isolate the direct contact between the carbon steel pipeline and the circulating cooling water, protect the carbon steel pipeline, and inhibit the corrosion of the carbon steel pipeline by microorganisms in the circulating cooling water for a long time.

The invention relates to the technical field of papermaking, in particular to food waterproof and oilproof paper and a preparation method thereof.The food waterproof and oilproof paper is composed of base paper and a coating layer covering the surface of the base paper; the base paper is prepared from the following raw materials: sisal fibers, polylactic acid fibers, water glass, nano silicon dioxide, starch and polyacrylamide; preparing a coating layer: coating the surface of base paper with the coating liquid, and then drying and calendering to obtain the coating layer; the coating liquid is prepared from the following raw materials: modified fucoidin, poly (butylene succinate), modified nano cellulose, sorbitol, polysilicate aluminum sulfate, polyvinyl alcohol, sodium thiosulfate and water. Through matching and combination of the raw materials, the food waterproof and oil-proof paper has certain antibacterial property and strength while improving waterproof and oil-proof properties, and the food fresh-keeping effect is improved.

Provided herein are pharmaceutically acceptable sodium thiosulfate and pharmaceutical compositions thereof. Also provided herein are methods for determining the total non-purgeable organic carbon in a sodium thiosulfate-containing sample. Further provided herein are methods for producing pharmaceutically acceptable sodium thiosulfate. Still further provided herein are methods of treatment comprising the administration of pharmaceutically acceptable sodium thiosulfate.

This invention provides a PAM staining method that enables staining suitable for magnified observation of various samples using a range of microscopes, from optical microscopes to electron microscopes. [Solution] A PAM staining method comprising the steps of: silvering a biological sample; coloring the biological sample; and fixing the color of the biological sample, wherein the biological sample is a biologically derived sample that has been oxidized; the silvering step involves immersing the biological sample in a methenamine silver aqueous solution at room temperature, raising the methenamine silver aqueous solution from room temperature to 62°C or higher and 68°C or lower, and carrying out the silvering reaction for 30 to 40 minutes from the start of the reaction at room temperature; the coloring step involves immersing the silvered biological sample in a 0.2% gold chloride aqueous solution at room temperature for 8 to 12 hours; and the fixing step involves immersing the sample in a hard film fixing solution containing 11% to 13% sodium thiosulfate and aluminum potassium sulfate dodecahydrate for 3 minutes or more at room temperature.

The invention relates to a water treatment agent for advanced treatment of thallium-containing wastewater in nonferrous metallurgy. The water treatment agent is prepared by fully mixing and uniformly stirring the following raw materials in parts by weight: 50-80 parts of a sodium diethyldithiocarbamate aqueous solution with the mass concentration of 5%-15%, 10-40 parts of sulfide or polysulfide and 10-40 parts of sodium thiosulfate. The water treatment agent provided by the invention can realize efficient removal of heavy metal ions, does not need a subsequent treatment process, not only simplifies the treatment process, but also reduces the treatment cost.

The invention discloses a thermal cracking carbon black iodine absorption value test detection method, and relates to the technical field of material detection. The method comprises the following steps: drying thermal cracking carbon black at 125 DEG C for 1 hour to remove water, weighing 0.5 g of a sample, stirring and adsorbing with 0.04730 mol / L iodine solution at the rotating speed of 10-30 r / min for 10-30 minutes, carrying out centrifugal separation at the rotating speed of 3000-5000 r / min, ensuring that no residual carbon black exists in supernate through light transmittance detection, titrating with 0.03940 mol / L sodium thiosulfate solution, and calculating an iodine absorption value by combining a blank test. The innovation point is an exclusive drying process, dynamic adsorption-centrifugation synergy and a quantitative quality control system. The method has the beneficial effects that the detection period is shortened to be within 1 hour, the measurement error is reduced to + / -1.5%, the problems of insufficient adsorption separation and the like of a conventional method are solved, and the method is suitable for carbon black quality control in the fields of waste tire recovery and the like.

The invention discloses a preparation method of tiamulin and tiamulin fumarate based on Bunte salt, which comprises the following steps: mixing the Bunte salt and pleuromutilin p-toluenesulfonate, reacting at 45-65 DEG C for 3-5 hours to synthesize tiamulin, preparing the Bunte salt through a reaction formula 1, and preparing the pleuromutilin p-toluenesulfonate through a reaction formula 2, the molar ratio of the 2-diethylaminoethanol to the sodium thiosulfate to the chlorination reagent in the reaction formula 1 is 1: (1-1.3): (1-1.5), and the molar ratio of the pleuromutilin to the paratoluensulfonyl chloride to the pyridine in the reaction formula 2 is 1: (1-1.2): (1-1.2); the prepared tiamulin and fumaric acid are used as raw materials for a salt forming reaction, the reaction temperature ranges from 55 DEG C to 65 DEG C, the reaction time ranges from 40 min to 80 min, and after the reaction is finished, the tiamulin fumarate is prepared through cooling, crystallization, centrifugation and drying; the tiamulin fumarate disclosed by the invention is high in content, low in total amount of impurities, few in variety and stable in quality under high-temperature and high-humidity conditions, and the preparation method is simple and easy to operate and good in product quality.

The invention discloses an underwater non-dispersible early strength grouting material and a preparation method thereof, and relates to the technical field of building materials, the underwater non-dispersible early strength grouting material comprises ordinary Portland cement, silica fume, quartz sand, underwater non-dispersible reinforcing powder, polyvinyl alcohol coated sodium thiosulfate and a polycarboxylic acid water reducer; the underwater non-dispersible reinforced powder is a mixture of polyoxyethylene, an acrylamide-acrylic acid-acrylamide propyl trimethyl ammonium chloride copolymer and methyl cellulose. The method disclosed by the invention is simple to operate, the prepared grouting material is good in stability, has good dispersion resistance and self-leveling property in water, and can keep stable in an underwater environment and effectively fill gaps, the hydration process of the grouting material is promoted through combined addition of polyvinyl alcohol coated sodium thiosulfate and underwater non-dispersible reinforced powder, and the grouting effect is improved. The early strength of the grouting material is improved.

The invention discloses a method for measuring the content of ferric ions in an iron-chromium flow battery electrolyte, which comprises the following steps: before the content of the ferric ions is measured, pretreating the electrolyte to be measured to remove the influence of Cr ions and other impurity ions in the electrolyte on an experimental result, and then titrating with a sodium thiosulfate standard solution; the method has the advantages that the method is suitable for directly measuring the content of the ferric ions under the coexistence condition of a large amount of ferrous ions, the problems that in the prior art, when a large amount of ferrous ions and a trace amount of ferric ions coexist, the error is large, and the accuracy is low are solved, and a technical guarantee is provided for capacity recovery and efficiency improvement of the electrolyte of the flow battery.

Described herein is anhydrous sodium thiosulfate, methods for synthesizing anhydrous sodium thiosulfate, pharmaceutical compositions thereof, and methods of treating ototoxicity. Anhydrous sodium thiosulfate is synthesized from sodium sulfite, sulfur, and cetylpyridinium chloride. The anhydrous sodium thiosulfate is formulated into a pharmaceutical composition comprising a buffer and solvent. These compositions are useful for eliminating or reducing ototoxicity in pediatric patients receiving platinum-based chemotherapeutics.

The invention relates to the technical field of disinfectant preparation, in particular to a composite phenol disinfectant and a preparation method thereof.The preparation method comprises the following steps that S1, a solution A is prepared; s2, dissolving butylated hydroxytoluene and sodium thiosulfate in an organic solvent to obtain a solution B; s3, mixing crude phenol, organic acid, cyclohexane and a surfactant with water, and uniformly stirring to obtain a solution C; s4, mixing the solution A, the solution B and the solution C, and adding carboxymethyl tallow-based poly (propylamine) sodium and a preservative to obtain a compound phenol disinfectant; and S5, adjusting the pH value of the mixed composite phenol disinfectant to finally obtain a finished product of the composite phenol disinfectant. By optimizing the formula and innovating the preparation process, the stability and durability of the disinfection effect are remarkably improved, the problems of effect fluctuation and poor stability of a disinfectant in the prior art are solved, and the requirements of the livestock and poultry breeding industry for an efficient and stable disinfectant are met.

The invention relates to a nano bismuth agent for preventing and / or treating gastritis infection as well as a preparation method and application thereof, the preparation method comprises the following steps: respectively dissolving soluble bismuth salt and a sulfur-containing compound, mixing, and reacting to obtain the nano bismuth agent after the reaction is finished, the sulfur-containing compound is any one or a combination of at least two of thioamino acid, vitamin B1, thioacetamide, sodium sulfide, sodium thiosulfate, bovine serum albumin, whey protein, ovalbumin or metallothionein. The prepared nano bismuth agent has efficient antibacterial performance, shows an excellent curative effect which is two orders of magnitude higher than that of an existing bismuth complex on clinically separated drug-resistant helicobacter pylori, and does not further induce increase of drug resistance of the helicobacter pylori.

The present application provides a kind of prevention and control method of green moss in water lily planting pool, specifically belongs to water quality control technical field.The prevention and control method of green moss in water lily planting pool described in the present application includes the following steps: before planting water lily, water injection, water level is controlled at 15~20cm, copper sulfate is applied to kill green moss and its spores, keep water body not to flow during disinfection;After disinfection, apply sodium thiosulfate, and plant water lily;After planting water lily, keep replenishing water, control water level to 40~50cm, when green moss first outbreak, apply mineral fulvic acid potassium and composite bacillus;Subsequent green moss outbreak, apply mineral fulvic acid potassium, or apply mineral fulvic acid potassium and composite bacillus.The prevention and control method described in the present application is safe and efficient, which can quickly and effectively remove green moss without inhibiting the growth of water lily, and also does not affect the harvest of water lily.

Disclosed in the present invention is an application of sodium thiosulfate as an auxiliary agent for nickel-cobalt precipitation. The application comprises the following steps: (1) adding sodium thiosulfate to a solution after iron and aluminum removal, and stirring at 50-65°C to obtain a nickel-cobalt precipitation stock solution; (2) adding an alkali to the nickel-cobalt precipitation stock solution, adjusting the pH of a system to 7.0-7.4, and maintaining the pH to allow for sufficient precipitation of nickel and cobalt to obtain precipitate; and (3) washing the precipitate to obtain mixed hydroxide precipitate (MHP). In the present invention, sodium thiosulfate is used as the auxiliary agent for nickel-cobalt precipitation, and the precipitation rate of nickel and cobalt from the solution after iron and aluminum removal is promoted by means of the addition of the auxiliary agent, reducing the content of manganese in MHP product. The present invention has good economic value and is easy for industrial application.

The invention provides an insecticidal double-water agent and a preparation method thereof, and relates to the technical field of pesticides, the insecticidal double-water agent comprises the following raw materials by weight: 90-95 parts of a sulfonation liquid, 3-8 parts of 4-chlorobenzyl chloride and 4-9 parts of magnesium chips. The preparation method specifically comprises the following steps: S1, preparing a Grignard reagent; s2, preparing concentrated sulfonation liquid; s3, reacting dimehypo with chlorine to prepare chloride; s4, enabling the Grignard reagent to react with chloride to generate 2-dimethylamino-2-p-chlorobenzyl chloro-1, 3-sodium dithiosulfonate propane; s5, enabling the 2-dimethylamino-2-p-chlorobenzyl chloro-1, 3-sodium dithiosulfonate propane to react with sodium thiosulfate, so as to prepare a sodium p-methanesulfonate insecticidal double-water agent; and S6, performing post-treatment on the sodium methanesulfonate insecticidal double water agent, and adding a synergist to obtain a final product. The dimehypo reagent prepared by the method disclosed by the invention is not crystallized at the high concentration of 36-43%, and the content of sodium hyposulfite is lower than 0.1%.

The invention relates to a nano hard chromium accelerant as well as a preparation method and application thereof. The nano hard chromium accelerant is obtained by uniformly mixing a first solution, a second solution, a third solution, a fourth solution and a fifth solution, the first solution comprises 40-80 g of a first mixture and 60 wt% of deionized water, and the first mixture comprises sodium benzenesulfinate, sodium thiosulfate and 60 wt% of deionized water, wherein the mass ratio of sodium benzenesulfinate to sodium thiosulfate is 2: 1; the second solution comprises 10-50 g of benzenesulfonic acid and 60 wt% of deionized water; the third solution comprises 2-8 g of tartaric acid and 60 wt% of deionized water; the fourth solution is prepared from 1g to 5g of alkylphenol polyoxyethylene ether and 60wt% of deionized water; the fifth solution comprises 0.5-3 g of a second mixture and 60 wt% of a 50 vol% ethanol solution, the second mixture comprises nano cobalt sulfate and nano silicon carbide in a mass ratio of 1: 1, and the particle size is 30-50 nm. By using the hard chromium accelerant disclosed by the invention, the deposition speed can be increased, the current efficiency can be improved, three wires can be produced per hour at the initial electroplating stage, fine and smooth crystal of a plating layer is ensured, and the hardness of the plating layer is improved.

The invention discloses a method for detecting the content of iron oxide impurities in brown aluminum oxide. The method comprises the following steps: sampling; preparing a sample solution; obtaining the volume of the sodium thiosulfate solution consumed by the sample solution; obtaining the volume of the sodium thiosulfate solution consumed by the purified water; and determining the percentage content of the iron oxide impurity in the brown aluminum oxide. According to the method for detecting the content of the iron oxide impurity in the brown aluminum oxide, the content of the impurity ferric oxide in the brown aluminum oxide can be simply and quickly detected at very low cost under the conditions that expensive instruments are not used and tedious and complicated operation steps are not needed.

The invention relates to the technical field of starch glue, and discloses waterproof starch glue as well as a preparation method and application thereof, the starch glue comprises the following raw materials: corn starch, water, a catalyst, an oxidizing agent, sodium hydroxide solid, sodium thiosulfate, borax, a tackifying modification component, a water repellent agent and a defoaming agent; wherein the tackifying and modifying component is an epoxy-terminated allyl polyether derivative containing a catechol structure, and after the tackifying and modifying component is mixed with the starch matrix, the adhesive property of the starch glue is effectively improved; the structure of the water-resistant agent contains a fluorine element with strong hydrophobicity, a silicon oxygen bond, a long alkyl chain and a tert-butyl chain link, so that the prepared starch glue has excellent waterproof performance, all the raw materials are matched with one another, the stability and reliability of the starch glue in a humid environment are ensured, and the service life of the starch glue is greatly prolonged.