35 results about "Potassium iodine" patented technology

The invention belongs to the field of pharmaceutical preparations, and relates to a multi-trace element injection and a preparation method thereof. The multi-trace element injection comprises effective components, a stabilizer and water, the effective components comprise chromium chloride, copper chloride, ferric chloride, manganese chloride, sodium molybdate, sodium selenite, zinc chloride, potassium iodide and sodium fluoride, and the stabilizer comprises xylitol, a pH regulator and an additive; and the additive is PEG (Polyethylene Glycol) 400 or PEG 600. The multi-trace element injection provided by the invention can effectively inhibit the loss of iodine in the sterilization process, and the stability, economical efficiency and production controllability of the multi-trace element injection are fundamentally improved.

To provide a mouthwash mixed with povidone iodine (PVPI), containing PVPI in a higher concentration than a conventional product (7%), and to provide a method for producing the same.SOLUTION: A method for producing a povidone-iodine-containing mouthwash containing povidone iodine in an amount of 10% by mass or more based on the total amount (100% by mass) of the mouthwash, the method comprising the steps of: 2.14 4.28, A method for producing a gargle, comprising the steps of: dispersing PVPI in PG to obtain a dispersion; and mixing the dispersion with a mixed solution a1 in which at least one selected from the group consisting of ethanol, glycerin, D-sorbitol solution (70%), saccharin sodium, and 1-menthol is dissolved in water, or a mixed solution a1 in which potassium iodine is further dissolved in the mixed solution a2.SELECTED DRAWING: None

The application relates to the technical field of electrocatalytic reduction of carbon dioxide, and provides a preparation method and application of a zinc-iodine diatomic pair (Zn-I / ICPs) carbon dioxide electro-reduction catalyst. The zinc-iodine diatomic pair is prepared by using nitrogen-doped carbon as a carrier and an in-situ gas-capturing MOF method, and the specific steps are as follows: first, ZIF-8 precursors are prepared by using zinc nitrate hexahydrate and 2-methyl imidazole as raw materials; then, the ZIF-8 and potassium iodide are co-pyrolyzed under a nitrogen atmosphere, the potassium iodide is used as an iodine source, zinc and iodine atoms are combined in an atomic dispersion form through a gas-phase doping mode, and a Zn-I diatomic pair is formed. The preparation method is simple and controllable, in the prepared Zn-I / ICPs, Zn sites and I sites successfully construct a synergistic catalytic center with complementary functions and electronic coupling, can effectively control an electrochemical microenvironment, accelerate water dissociation and proton transfer, and simultaneously highly effectively inhibit a hydrogen evolution side reaction, and the zinc-iodine diatomic pair can catalyze carbon dioxide electro-reduction to prepare carbon monoxide with high activity and high selectivity.

The application provides a method for separating thiophene compounds in petroleum oil products and application thereof, and the method comprises the following steps: S1: dissolving the petroleum oil product and an alkylating agent in a first solvent to obtain a dissolved oil sample; S2: loading a filler loaded with a catalyst into an adsorption column, transferring the dissolved oil sample into the adsorption column, standing, then sequentially eluting the adsorption column with a second solvent and a third solvent respectively, and collecting an eluent eluted by the third solvent; and S3: fully mixing the eluent with potassium iodide modified silica gel, filtering and collecting a filtrate, so that the thiophene compounds are separated. According to the method, the thiophene compounds in the petroleum can be separated with high purity and high yield, the operation condition of the method is mild, and the thiophene compounds in the petroleum oil products, especially in the high maturity crude oil, can be completely, efficiently and accurately separated.

The invention discloses a preparation method of a delta-aminoketone derivative, which comprises the following steps: reacting olefin, N-aryl sulfonyl aziridine, arylboronic acid, nickel iodide, 5, 5 '-dimethyl-2, 2'-bipyridine, formic acid, acetic anhydride, sodium carbonate and potassium iodide at 80 DEG C for 20 hours, and after the reaction is completed, performing post-treatment to obtain the delta-aminoketone derivative. According to the preparation method, olefin, N-aryl sulfonyl aziridine and arylboronic acid are taken as reactants, formic acid is taken as a carbonyl source, the reaction condition is mild, the operation is simple, the tolerance range of substrate functional groups is wide, and the reaction efficiency is high. Various delta-aminoketone derivatives can be synthesized according to actual needs, so that the method is convenient to operate, and the practicability of the method is widened.

This invention provides a method for preparing 1,2-diaminomethyl-cyclobutane-diiodoplatinum. The method includes: preparing crude 1,2-diaminomethyl-cyclobutane-diiodoplatinum using potassium chloroplatinate, potassium iodide, diaminomethylcyclobutane oxalate, and alkali metal hydroxide as raw materials; dissolving the crude product in a mixed solvent of N,N-dimethylformamide and acetonitrile; filtering to obtain a filtrate; adding water to the filtrate to induce crystallization and obtain 1,2-diaminomethyl-cyclobutane-diiodoplatinum; wherein the molar ratio of potassium chloroplatinate to potassium iodide is controlled at 1:12 to 1:20; and the molar ratio of diaminomethylcyclobutane to potassium chloroplatinate in diaminomethylcyclobutane oxalate is 0.95 to 1.15:1, etc., resulting in a purity of 1,2-diaminomethyl-cyclobutane-diiodoplatinum greater than 90%, thus solving the technical problem of low purity in existing technologies.

The application discloses an anti-fatigue composition for high-temperature environment and application, and belongs to the technical field of medicines.The anti-fatigue composition for high-temperature environment is composed of the following components in parts by weight: 15-45 parts of mung beans, 15-45 parts of adzuki beans, 15-45 parts of black beans, 5-15 parts of licorice, 5-20 parts of medlar, 2-12 parts of American ginseng, 0.3-1 parts of L-calcium lactate, 0.01-0.05 parts of zinc gluconate, 0.00005-0.0005 parts of potassium iodide, 0.0002-0.0015 parts of vitamin and 0.0001-0.001 parts of vitamin.The anti-fatigue composition for high-temperature environment can enhance the anti-heat stress capacity of mice exposed to high temperature, prolong the exhaustive swimming time of mice under high-temperature load and enhance the anti-fatigue capacity of mice in a high-temperature environment.

The invention belongs to the technical field of fire extinguishing materials. The invention provides a fire extinguishing material additive, an inorganic powder fire extinguishing material and a preparation method thereof, the fire extinguishing material additive comprises a first composition and a second composition, the first composition comprises polyoxyethylene, cellulose ether, diammonium hydrogen phosphate, urea, pentaerythritol, a leveling agent, a defoaming agent, silicone amide, potassium iodide and deionized water, the second composition includes hydrogen peroxide. According to the fire extinguishing material additive, inorganic powder is rapidly foamed at a high rate to form powder foam with the volume rate of 30-60 times to form foam solids, the foam bodies have relatively high stability, and the inorganic powder fire extinguishing material has the effects of suffocation, isolation, wrapping and the like, can rapidly extinguish solid, liquid, gas, charged and cooking material fire extinguishing materials, and can be used as a fire extinguishing material for fire extinguishing. The fire behavior can be rapidly and effectively controlled, a fire source can be rapidly blocked, secondary pollution is avoided, and reburning is not prone to occurring.

The invention discloses a method for determining the content of phenol in an iron-dextran injection / solution through combination of iron-sodium dihydrogen phosphate precipitation impurity removal and back titration, and relates to the field of analytical chemistry. According to the method, pretreatment is realized through precipitation reaction of iron and sodium dihydrogen phosphate, and interference of iron ions in iron dextran on detection is eliminated. Phenol and bromine are subjected to a bromo-phenol reaction through a potassium bromate-potassium bromide system, excessive bromine and potassium iodide are subjected to a reaction to generate iodine, a sodium thiosulfate titration solution is used for titration by means of an iodometric method, and the content of phenol is calculated. The method does not need a precise instrument, is simple and convenient to operate, can simply, quickly and accurately measure the phenol content in the iron-dextran injection / solution, effectively solves the problem of the existing detection technology in the detection of the sample, fills the technical gap in the detection of the phenol content of the iron-dextran preparation in China, and has a good application prospect. And a brand new solution is provided for veterinary drug production quality control and related detection work.

The invention relates to the technical field of chemical synthesis of pesticides, in particular to a preparation method of a key intermediate-3-iodine-5, 5-dimethyl-4, 5-dihydroisoxazole of a high-efficiency herbicide pyroxasulfone, which comprises the following steps: by taking glyoxylic acid and hydroxylamine hydrochloride as initial raw materials, carrying out oximation reaction to obtain glyoxylic acid oxime; then efficiently completing an iodination reaction through a potassium iodide / iodine elementary substance system under a mild condition, and controlling the reaction process to reduce the generation of byproducts so as to obtain high-purity diiodoformaldoxime; and finally, carrying out addition reaction with isobutene under the condition of normal pressure to finally obtain the target product with high purity and high yield. The core innovation point of the invention is to develop and verify multiple types of novel iodination catalysts, solve the problems of excessive iodine source, poor selectivity and long reaction period in the traditional iodination reaction, and realize collaborative improvement of reaction efficiency, selectivity and economy. The method has the characteristics of more efficient route, more controllable conditions, safer operation, further improvement of yield and purity, higher cost advantage and the like, and the industrial application value is remarkably enhanced.

The invention discloses a rubber accelerator 3-methylpiperidinyl dithio sulfenamide piperazine as well as a preparation method and application of the rubber accelerator 3-methylpiperidinyl dithio sulfenamide piperazine. The method comprises the following steps: dissolving anhydrous piperazine in absolute ethyl alcohol under a stirring condition, adding an aqueous solution containing sodium hydroxide, stirring at room temperature, cooling, adding carbon disulfide stored in absolute ethyl alcohol, stirring, adding a proper amount of 4-methylpiperidine into the system, standing, dropwise adding iodine and potassium iodide which are dissolved in deionized water, continuing to react after the addition is completed, filtering, washing, and drying to obtain the 4-methylpiperidine. And filtering with deionized water, drying and crushing. The accelerator 3-methylpiperidyl dithiosulfenamide piperazine prepared by the invention has the characteristics of high vulcanization rate of a dithiocarbamate accelerator and moderate scorch period of a sulfenamide accelerator, and can solve the problem of rapid vulcanization of ethylene propylene diene monomer.

The application discloses a kind of based on physical-chemical synergistic foaming ultra-light thermal insulation material and preparation method thereof, belong to building thermal insulation material technical field.The ultra-light thermal insulation material based on physical-chemical synergistic foaming of the application, by weight parts, including the following components: light-burned magnesium oxide: 28-37 parts, magnesium sulfate heptahydrate: 18-26 parts, foaming agent: 3.6-5.4 parts, thickening agent: 4.1-5.7 parts, modifier: 0.1-0.4 parts, hydrogen peroxide: 1.5-2.3 parts, potassium iodide: 0.6-1.3 parts, water 45-58 parts.The light thermal insulation material of the application is greatly reduced to 60-80kg / m 3 , and 7d strength is greater than or equal to 100kPa, A-grade non-combustible, thermal conductivity is less than or equal to 0.038W / (m·K), effectively solve the problem that the specific gravity of existing cement-based thermal insulation material is high and thermal conductivity is large, greatly improve the popularization and application of cement-based thermal insulation material.

The invention discloses a special fertilizer for drynaria fortunei planting and a preparation method thereof. The special fertilizer comprises a leaf fertilizer for drynaria fortunei spraying and an organic biological enzyme water-soluble fertilizer for drynaria fortunei rhizome, the spraying leaf fertilizer is prepared from the following raw materials: potassium nitrate, ammonium nitrate, magnesium sulfate heptahydrate, monopotassium phosphate, calcium chloride dihydrate, manganese sulfate tetrahydrate, zinc sulfate heptahydrate, boric acid, potassium iodide, sodium molybdate dihydrate, copper sulfate pentahydrate, cobalt chloride hexahydrate, ferrous sulfate heptahydrate and ethylenediaminetetraacetic acid; the organic biological enzyme water-soluble fertilizer is prepared from the following raw materials: rapeseed cakes, melons and fruits, plant ash, soybean meal, industrial brown sugar, a microbial agent, proteolytic enzyme and cellulase. The leaf fertilizer is used for spraying leaf surfaces of drynaria fortunei seedlings, the organic biological enzyme water-soluble fertilizer is used for irrigating rhizomes of drynaria fortunei, growth of the drynaria fortunei seedlings can be effectively promoted, and it can be calculated according to the stem weight that the fresh weight of the drynaria fortunei seedlings per mu can reach 1252.4 kg or above under the condition that the seedlings are 10000 per mu.

The application provides a preparation method of a wastewater biochemical treatment accelerator with sepiolite as a carrier, sepiolite powder is prepared, sepiolite powder with 150-200 meshes and acidification activation is selected to ensure that the sepiolite powder has good pore structure and surface activity; manganese dioxide powder is added, 200 mesh manganese dioxide powder is added into the sepiolite powder, and the two are fully mixed to enhance the trace element adsorption capacity of the sepiolite and promote the formation of free ammonia; a metal salt solution is added, and ferrous sulfate, zinc sulfate, copper sulfate, nickel sulfate, potassium iodide, sodium molybdate, cobalt sulfate, sodium selenite and potassium fluoride are sequentially added to react, and the proportion of each component is ensured to be within a specified range. The product has excellent adsorption performance and long-acting slow-release characteristics, can significantly improve the growth environment of microorganisms, enhance the impact resistance and stability of the system, and is especially suitable for wastewater treatment scenes containing trace heavy metal pollutants or trace toxic substances, such as livestock and poultry breeding wastewater.

The invention discloses an organ maintenance liquid for repairing liver functions as well as a preparation method and application of the organ maintenance liquid. The feed additive comprises the following components: an oxygen-carrying component, succinyl gelatin, sodium chloride, sodium hydroxide, sodium bicarbonate, calcium gluconate, magnesium sulfate, chromium chloride, copper chloride, ferric chloride, manganese chloride, sodium molybdate, sodium selenite, zinc chloride, potassium iodide, sodium fluoride, isoleucine, leucine, lysine acetate, methionine, phenylalanine, threonine, tryptophan, serine, valine and histidine. The injection is prepared from arginine, alanine, asparaginic acid, cysteine, glutamic acid, proline, tyrosine, glycine, sodium hydrogen sulfite, heparin, methylprednisolone sodium succinate, broad-spectrum antibiotics, antifungal drugs, FXR agonists and sterilized water for injection. The oxygen-carrying component is washed red blood cells or concentrated red blood cells or artificial blood. The viscosity of the organ maintenance liquid is closer to that of plasma, the influence on the blood coagulation function and the renal function is avoided, and the organ maintenance liquid has higher safety, can treat ischemia reperfusion injury, repair the liver biliary tract function and remarkably reduce various inflammation indexes, and is used for ischemia-free liver transplantation.

The invention provides a synthesis method of etifoxacin, and relates to the technical field of organic synthesis, and the synthesis method comprises the following steps: adding triphenylmethyl phosphorus bromide into a solvent, adding potassium tert-butoxide at 0-5 DEG C to obtain a suspension, preparing a 2-aminobenzophenone solution, reacting the suspension at room temperature for 30-40 minutes, adding the 2-aminobenzophenone solution into the suspension, and reacting for 30-40 minutes at room temperature to obtain the etifoxacin. Completely reacting to obtain a compound 2; dissolving the compound 2 in dichloromethane, dropwise adding ethyl isocyanate, heating to room temperature, and reacting to obtain a compound 3; mixing the compound 3, Selectfluor and a compound A, adding acetonitrile, and reacting at room temperature for 60-70 minutes to obtain a compound 4; and reacting the compound 4 and sodium borohydride in ultra-dry dimethyl sulfoxide at room temperature under the protection of nitrogen to obtain etifusin. The compound A is selected from any one of potassium iodide, Selectfluor, tetrabutylammonium chloride and tetrabutylammonium bromide. According to the invention, synthesis of etifusin is realized by a metal-free catalysis and green chemical method, and the yield is high.

The application discloses a kind of carbon dioxide corrosion inhibitor based on mannich base and its preparation method and application, belong to petroleum chemical industry metal material protection technical field.Main agent mannich base is with 3-amino crotonitrile, 3-hydrazine quinoline, phenylacetone, cinnamaldehyde as main, it is prepared by condensation, mannich two-step reaction, its structure is as shown in formula A.The inhibitor includes by mass percentage:mannich base A 30~40%, alkylamine 8~16%, potassium iodide 0.3~0.6%, surfactant 10~20%, organic solvent 30~60%.Mannich base A synthesis is simple, post-treatment is convenient, molecule contains quinoline, pyrazole, carbonyl, double bond, phenyl functional group simultaneously, can be well adsorbed on carbon steel surface and form dense protective film to prevent the invasion of corrosive medium.Add alkylamine, potassium iodide, surfactant, organic solvent, water solubility increases after compounding, corrosion inhibition effect is enhanced.The corrosion inhibitor has the characteristics such as small amount, high efficiency, wide application range, and has wide application prospect in oil and gas production.

The invention belongs to the technical field of biology, and relates to plant nutrition stress, in particular to an application model and an implementation method for improving the nutrition stress of arabidopsis thaliana. The arabidopsis thaliana WT is Columbia type arabidopsis thaliana (Columbia / Col-0), and the used mutants are all mutated in the wild type plant. The applicant finds that hydrogen peroxide and potassium iodide have a good regulation effect on plant response nutrition stress through experiments, meanwhile, internal reasons are analyzed, according to the analysis result, the applicant provides a plant nutrition stress and active oxygen regulation and control model, and according to the model, a scheme for improving the resistance of plants under the nutrition stress is provided. By using the model and the corresponding processing method provided by the invention, the growth condition and chlorophyll content of the plant under nutrition stress can be effectively improved.

The invention belongs to the technical field of organic synthesis, and particularly relates to a metal-free reaction method for efficiently constructing a C-C-O bond based on glyoxylic acid, which comprises the following steps: by taking benzothiazole or a derivative thereof and glyoxylic acid monohydrate as reaction substrates, potassium iodide and potassium persulfate as synergistic catalysts and an alcohol compound as a solvent, stirring and reacting in the air; the benzothiazole-2-carboxylic ester and the derivative thereof are obtained. According to the invention, different alcohol solvents are used during the reaction to directly complete the modification of ester groups, so that the reaction steps are obviously simplified, the blank of ester compounds which are difficult to synthesize by some existing methods is filled, and the benzothiazole which is not pre-functionalized can be directly used as a substrate, so that the method is more economical and efficient than the traditional method. And a novel method is provided for esterylation of the nitrogen-containing heterocyclic compound.

The invention provides a thin-layer method for identifying caramel malt formula granules and application, and the thin-layer method for identifying the caramel malt formula granules comprises the following steps: preparing a contrast sample application sample by using caramel malt decoction pieces, and preparing a sample application sample for test by using the caramel malt formula granules, a developing solvent adopted by the thin-layer method is n-hexane-ethyl acetate-methanol with the volume ratio of 5: (9-11): 1, after sample application, a developing plate is placed in an ammonium hydroxide pre-saturated developing cylinder to be developed, taken out, aired, sprayed with a potassium iodide iodine test solution, volatilized to be dry and placed under the sunlight to be inspected. According to the method, the caramel malt decoction pieces are used as control decoction pieces, the specificity is high, and the method is suitable for identifying related preparations such as caramel malt aqueous extracts and formula granules.

The invention discloses a reverse osmosis phosphorus-free environment-friendly scale inhibitor, and belongs to the technical field of water treatment agents. The scale inhibitor comprises the following components in percentage by mass: 1%-5% of sodium carboxymethyl cellulose, 2%-8% of sodium lignin sulfonate, 3%-10% of an aminopropanesulfonic acid-acrylic acid copolymer, 4%-12% of a maleic acid-acrylic acid copolymer, 1%-6% of tartaric acid, 0.1%-1% of potassium iodide, 2%-7% of a first solvent, 1%-5% of a second solvent, 0.5%-3% of a corrosion inhibitor and 0.5%-2% of a pH regulator. Through innovative combination of a composite dispersion system, a bi-copolymer scale inhibition system, a chelation-corrosion inhibition synergistic system and a solvent-assistant adaptation system, full-demand coverage of scale inhibition-dispersion-corrosion inhibition-dissolution-stabilization is realized, and the scale inhibitor has the advantages of no phosphorus, environmental protection, high adaptability, high efficiency and low consumption; the defects of function fragmentation, poor environmental protection property and weak adaptability in the prior art are overcome, and the method can be widely applied to membrane treatment systems of reverse osmosis, nanofiltration and the like.

The application discloses a pueraria powder-based iodine compound and a preparation method and application thereof, and comprises the following steps: mixing pueraria powder with water to form a pueraria powder water suspension; performing hydrothermal gelatinization and respiration treatment on the pueraria powder water suspension to obtain a gelatinized and respiration pueraria powder suspension; adding potassium iodide, potassium iodate and acid into the gelatinized and respiration pueraria powder suspension, adjusting the pH value of the system to be acidic, performing reaction, and obtaining the pueraria powder-based iodine compound through post-treatment. The application constructs a loading framework through gelatinization and respiration of pueraria powder, realizes stable loading of iodine by relying on in-situ reaction, and realizes the multiple effects of low stimulation, efficient inhibition of digestive tract pathogenic bacteria and precise regulation of intestinal microecology by synergistic effect of the strong bactericidal capacity of iodine which is not prone to drug resistance and the inherent intestinal flora regulation activity of pueraria powder, so that the pain points of instability and strong irritation of traditional iodine preparations are solved, and a new way for treating digestive tract infectious diseases is opened up.

The invention discloses a preparation method and application of a novel water-soluble propofol nano-composite, and relates to the technical field of nano-composite drug research and development, and the key points of the technical scheme are as follows: firstly, preparing Pdots from a conjugated polymer F8BT and an amphiphilic polymer PSMA through a nano coprecipitation method; then promoting a phenolic hydroxyl group of propofol and an acylation reagent chloroacetyl chloride to be subjected to a substitution reaction by DMAP to generate ester, and reacting amino on cystamine and an acyl chloride bond on the ester under the catalysis of potassium carbonate and potassium iodide to generate PPF-SS-NH2; carrying out condensation reaction on amino of the PPF-SS-Pdots and carboxyl of Pdots to obtain a PPF-SS-Pdots nano compound; and finally, synthesizing the PRP from the nano-composite and RVG-29 through an electrostatic adsorption effect. The anesthesia onset time and maintenance time of PRP are equivalent to those of common propofol, the awakening time is remarkably shortened, meanwhile, injection pain and other side effects are reduced, and rapid detection is achieved.

The application discloses an environment-friendly rubber-plastic fiber plastic wood material and a preparation method thereof, and comprises the following components in parts by weight: FR-PVG powder 100 parts, polyvinyl chloride thermoplastic elastomer 10-15 parts, calcium carbonate 40-50 parts, environment-friendly plasticizer 8-12 parts, epoxy soybean oil 4-6 parts, calcium-zinc composite stabilizer 3-5 parts, coupling agent 3-5 parts, PE wax 1 part, 0.1 mol / L acetic acid solution 200-250 parts, potassium iodide 1 part, polyethylene glycol 1-1.2 parts, and zinc stearate 1-1.5 parts. The polyester cotton fiber, PVC and flame retardant components in the waste rubber-plastic fabric whole-core flame-retardant conveying belt are mixed and dispersed with calcium carbonate to prepare the environment-friendly rubber-plastic fiber plastic wood material which is high in strength, good in flame retardancy and reusable, and realizes green recovery and high-value utilization of the waste rubber-plastic fabric whole-core flame-retardant conveying belt.

A method for manufacturing a polarizing film, comprising at least the following steps sequentially: a swelling step, a dyeing step, a first crosslinking and stretching step, a second crosslinking and stretching step, and a third crosslinking and stretching step for a polyvinyl alcohol film. The polyvinyl alcohol film has a thickness of 5–100 μm and an average degree of polymerization of 2000–4000 for the polyvinyl alcohol contained in the film. In the swelling step, the polyvinyl alcohol film is swelled by immersion in water at 10–50°C. In the dyeing step, the film is immersed in an aqueous solution containing a total of 0.5–3% by mass of iodine and potassium iodide at 10–50°C to allow the iodine-based dichroic pigment to penetrate the polyvinyl alcohol film. Simultaneously, uniaxial stretching is performed to achieve a total stretch ratio of 2–3 times. In the first crosslinking and stretching step… Uniaxial stretching is performed in an aqueous solution containing 1-5% by mass boric acid at temperature T1, so that the stretching ratio in this step is 1.1-1.3 times and the total stretching ratio is 2.5-3.5 times. In the aforementioned second crosslinking stretching step, uniaxial stretching is performed in an aqueous solution containing 1-5% by mass boric acid at temperature T2, so that the stretching ratio in this step is 1.3-1.8 times and the total stretching ratio is 4-6 times. In the aforementioned third crosslinking stretching step, uniaxial stretching is performed in an aqueous solution containing 1-5% by mass boric acid at temperature T3, so that the stretching ratio in this step is 1.1-1.3 times and the total stretching ratio is 4.5-7 times. The above T1, T2 and T3 satisfy the following equations (1) and (2). Thus, even when the average degree of polymerization of PVA is low, production stability can be maintained, and a polarizing film with excellent polarization performance and low shrinkage stress can be obtained. 25≤T1≤45 (1), T1<T2<T3≤75 (2).

The invention relates to the technical field of chemical test methods, and particularly discloses a method for detecting oxidizing impurities in industrial anhydrous hydrogen fluoride, which comprises the following steps: S1, in a fuming cupboard, in a closed container made of a hydrofluoric acid-resistant material, mixing an original sample of industrial anhydrous hydrogen fluoride with quantitative crushed ice to obtain a diluted sample with the hydrogen fluoride mass fraction of 45-55%, calculating a dilution coefficient X; s2, accurately weighing a diluted sample with the mass of m, sequentially adding a starch indicator solution and a potassium iodide solution into a reaction vessel made of a hydrofluoric acid-resistant material, uniformly mixing, and carrying out sealed and dark standing reaction for 1-3 minutes; s3, titrating the solution obtained in the step S2 by using a sodium thiosulfate standard titration solution with the concentration of c, and recording consumption V; and S4, calculating the content of the oxidizing impurities in the industrial anhydrous hydrogen fluoride original sample according to a formula C (ppm) = [((V-V0) * c * M) / (m * X)] * 1000. The invention provides a safe and accurate detection method by combining crushed ice dilution, specific concentration window control and iodometry.

This invention proposes an online monitoring method for total arsenic in water, comprising the following steps: mixing a water sample with a potassium persulfate aqueous solution and heating to digest it, oxidizing all forms of arsenic to pentavalent arsenic; adding sulfuric acid and tartaric acid to the digestion solution to adjust the pH to 12, and adding ascorbic acid and potassium iodide to complex copper ions, adding potassium borohydride to generate arsine, and purging with air to remove the arsine; introducing the arsine into an iodine and potassium iodide aqueous solution to oxidize it to arsenate, then adding ammonium molybdate to generate arsine molybdenum heteropolyacid, and again adding ascorbic acid and potassium iodide to reduce it to molybdenum blue; measuring the absorbance and plotting a standard curve to calculate the total arsenic content. By using an iodine-potassium iodide solution as the arsine absorption solution, the absorption efficiency and stability are superior to conventional acidic potassium permanganate solution; simultaneously, tartaric acid masks antimony ions, and ascorbic acid and potassium iodide synergistically complex copper ions, effectively eliminating Sb. 3+ / Cu 2+ Interference can be eliminated to achieve accurate online monitoring of total arsenic in water.

The invention relates to a novel process for synthesizing gamma-mercaptopropyl triethoxy silane by a water phase method, which comprises the following steps: sequentially adding deionized water, sodium chloride, sodium hydrosulfide, potassium iodide, sodium carbonate, tetrabutylammonium bromide and cetyltrimethylammonium bromide into a reaction container, dropwise adding 3-chloropropyl triethoxy silane into the reaction container, keeping the temperature at 50-55 DEG C, reacting for 1-2 hours, filtering, washing and drying to obtain the gamma-mercaptopropyl triethoxy silane. The method comprises the following steps: adding 3-chloropropyltriethoxysilane into a reaction solution, reacting for 50-75 minutes, monitoring the reaction process through gas chromatography until the residual 3-chloropropyltriethoxysilane in the reaction solution is less than 0.5%, completing the reaction, cooling to room temperature, standing for 10-20 minutes until two phases are layered, washing and drying the organic phase, and carrying out reduced pressure distillation on the organic reagent to obtain gamma-mercaptopropyltriethoxysilane. Compared with the existing aqueous phase synthesis process, the method provided by the invention has the advantages that the mass transfer efficiency of the reaction can be remarkably improved, so that the reaction time is shortened, the yield is improved, the generation of by-products such as ethanol is effectively reduced, and meanwhile, the method is relatively light in smell in the reaction process, simple and convenient in process and easy to realize large-scale industrial production.

The invention relates to a method for rapidly detecting acetonitrile in gas, which belongs to the technical field of environmental pollutant detection technology, a test paper sheet is placed in a gas environment to be detected, the color change of the test paper sheet is observed, and the acetonitrile concentration is qualitatively judged or quantitatively judged according to the color change of the test paper sheet, the test paper sheet is prepared by the following steps: step 1, dissolving 1.0 to 3.0 mmol of N, N-diphenyl-4-(quinoline-5-yl) aniline in 1.0 to 3.0 mL of N, N-dimethylacetamide, and adding 40.0 to 50.0 mu L of a hydroiodic acid aqueous solution to form a solution A; dissolving 1.0-3.0 mmol of silver iodide in 1.0-3.0 mL of a saturated potassium iodide aqueous solution to form a solution B, mixing the solution A and the solution B, and standing to generate a yellow crystal to form a target object; and 2, uniformly distributing the target object on the filter paper sheet through the dispersion liquid, and airing or drying to form the test paper sheet. According to the invention, rapid qualitative or quantitative detection of acetonitrile in gas can be realized.

The application provides a chicken feed additive and application thereof, and belongs to the technical field of feed additives.The chicken feed additive comprises the following raw materials: organic manganese, hydroxyl vitamin D, calcium hydrogen phosphate, stone powder, sodium chloride, methionine, lysine, vitamin A, vitamin D, vitamin K, vitamin E, phytase, choline, baking soda, copper sulfate, ferrous sulfate, zinc sulfate, potassium iodide and sodium selenite.The raw materials of the chicken feed additive are easy to obtain, can be directly added to conventional laying hen feed for use, are convenient to apply and controllable in cost.The additive can effectively relieve oxidative stress in the liver, reduce the level of pro-inflammatory cytokines in the liver, thereby reducing liver inflammation, and can well inhibit fat deposition.