41 results about "Potassium bromide" patented technology

The invention relates to an absorbable bone hemostasis and repair stent. The absorbable bone hemostasis and repair stent comprises the following raw materials in parts by weight: 15-60 parts of an excipient, 15-60 parts of a softening agent and 5-70 parts of a bone repair promoting component, the excipient is prepared from a polyoxyethylene-polyoxypropylene copolymer; the softening agent comprises a semi-solid mobile phase polymer; the bone repair promoting component comprises a coating and a core, the coating comprises a polylactic acid-glycolic acid copolymer, zinc stearate and potassium bromide, the core comprises calcium phosphate particles, and the coating wraps the surface of the core. The preparation method comprises the following steps: preparing the bone repair promoting component; and preparing the absorbable bone hemostasis repair stent. The absorbable bone hemostasis and repair stent is high in hemostasis and collapse resistance and has good inflammation regulation and bone repair promoting effects. The absorbable bone hemostasis and repair stent can be used for bone hemostasis and bone repair promotion of any bone injury wound.

This invention discloses a method for preparing a Bi3O4Br catalyst for the efficient degradation of tetracycline, comprising the following steps: S1, mixing bismuth nitrate and potassium bromide in an aqueous solution at room temperature, stirring, and filtering after the reaction to obtain a precipitate; S2, washing and drying the obtained precipitate to obtain a BiOBr precursor; S3, placing the obtained BiOBr precursor in a sodium hydroxide solution of a certain concentration and reacting at a certain temperature to obtain the Bi3O4Br catalyst. Experimental results show that the Bi3O4Br catalyst has a larger specific surface area and more photocatalytic active sites than pure Bi3O4Br, and has a higher oxygen vacancy (OV) concentration, exhibiting high catalytic activity in the photocatalytic degradation of tetracycline. This photocatalyst has broad practical value and application prospects.

The invention discloses a preparation method and application of high-fluorescence quantum yield perovskite fluorescent powder based on amino acid, and belongs to the technical field of luminescent materials and display, the preparation method is used for preparing the perovskite fluorescent powder, and the preparation method comprises the following steps: dissolving potassium bromide in deionized water, then adding lead bromide, and carrying out ultrasonic dissolution to obtain a first solution; dissolving cesium bromide in another deionized water to obtain a second solution; mixing the first solution and the second solution, and standing to obtain a mixed solution; dropwise adding the mixed solution into absolute ethyl alcohol, and stirring to obtain a precursor solution; adding amino acid into the precursor solution, and stirring to obtain a precursor reaction suspension; and centrifuging the suspension, collecting the precipitate, centrifugally washing the precipitate with absolute ethyl alcohol, and drying the washed precipitate to obtain the perovskite fluorescent powder. The invention provides a green synthesis method of a water-ethanol system, which is combined with an amino acid synergistic passivation effect to realize low-cost preparation and improvement of luminous efficiency.

The present application relates to a kind of for CO2 reduction CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst and its preparation method, the preparation method has the following steps: with bismuth oxychloride and lead nitrate is added to aqueous solution, freeze-drying after ultrasonic, by muffle furnace calcination, obtain precursor material;CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst is obtained by two-step calcination method again by adding cesium bromide and potassium bromide, dissolving, ultrasonic, freeze-drying, by muffle furnace calcination its feature is.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared has excellent performance and good cycle stability.The drug used in preparation is easily obtained and low in price, and preparation is simple and short in time.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared can be successfully applied in the field of photocatalytic CO2 reduction.

The invention belongs to the technical field of air pollution prevention and control of photocatalytic materials, and particularly relates to a nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) respectively dissolving ammonium sulfate, bismuth nitrate and potassium bromide in water, mixing and transferring into polytetrafluoroethylene, and obtaining nitrogen-doped bismuth oxybromide by utilizing a hydrothermal method; 2) adopting a hydrothermal-assisted thermal polymerization method, obtaining a precursor through a melamine hydrothermal reaction, and performing nitrogen calcination to obtain tubular graphite-phase carbon nitride; 3) adding the mixed sample into methanol, and adopting a mechanical stirring method to obtain the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst. Due to the formation of the heterojunction, the activity of the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride in photocatalytic reduction of carbon dioxide can be greatly improved.

The invention relates to a qualitative and quantitative method for liensinine perchlorate. The qualitative method comprises the following steps: weighing 1mg of liensinine perchlorate and 1mg of liensinine, uniformly grinding and tabletting the liensinine perchlorate and the liensinine with 100mg of potassium bromide respectively, acquiring an infrared spectrum of 4000-400cm <-1 > by adopting an infrared spectrometer, and comparing spectrograms to find that the peak shapes of the liensinine perchlorate and the liensinine are similar, the peak shapes of the liensinine perchlorate and the liensinine perchlorate are common characteristic peaks and the peak shapes of the liensinine perchlorate are unique characteristic peaks of the liensinine perchlorate and the liensinine are common characteristic peaks and the peak shapes of the The quantitative method comprises the following steps: weighing a series of liensinine perchlorate reference substances with different masses, uniformly grinding and tabletting the liensinine perchlorate reference substances and 100mg of potassium bromide respectively, collecting an infrared spectrum, carrying out integration on a 625cm <-1 > characteristic peak to obtain a peak area, and drawing a standard curve by taking the peak area as a vertical coordinate and taking the sampling mass of the reference substances as a horizontal coordinate; the method comprises the following steps: weighing a sample to be detected, collecting an infrared spectrum, integrating a 625cm <-1 > characteristic peak to obtain a peak area, substituting the peak area into the standard curve equation, calculating the mass of the liensinine perchlorate in the sample, and substituting the mass into the content calculation formula to obtain the content of the liensinine perchlorate in the sample. The method is good in precision, repeatability and stability, wide in linear range, high in linear correlation coefficient and high in recovery rate, the problem that liensinine interference cannot be avoided in an existing content determination method is effectively solved, whether liensinine perchlorate is generated or not can be qualitatively judged, and the quantity of liensinine perchlorate generated can be quantitatively detected; and a feasible new method is provided for production process optimization and quality evaluation of liensinine perchlorate.

The invention discloses a method for measuring main components of a calcined nacre mother medicinal material before and after irradiation, which comprises the following steps: (1) preparation of a test sample: weighing the irradiated calcined nacre mother, adding potassium bromide, putting into an agate mortar, uniformly grinding under an infrared lamp to obtain mixed powder, transferring the mixed powder into a mold, transferring the mold to a tablet press, vacuumizing, pressurizing, and drying to obtain the test sample; a test sample is obtained; (2) preparation of a reference substance: weighing calcined mother-of-pearl before irradiation, adding potassium bromide, placing in an agate mortar, uniformly grinding under an infrared lamp to obtain mixed powder, transferring the mixed powder into a mold, transferring the mold to a tablet press, vacuumizing and pressurizing to obtain the reference substance; and (3) determining the fingerprints of the test sample and the reference substance by using an infrared spectrometer method, and carrying out fingerprint change analysis. The method is of great significance to quality research before and after irradiation of the calcined mother-of-pearl and guarantee of the curative effect of the product.

The invention discloses a nano-composite photocatalytic material and a preparation method and application thereof.The preparation method comprises the steps that porous carbon nitride is added into deionized water and stirred, then a silver nitrate solution is added and stirred continuously, then a potassium bromide solution is dropwise added and stirred for a period of time, and the nano-composite photocatalytic material is obtained through filtering, washing, roasting and grinding. The porous carbon nitride and silver bromide nanoparticle composite material is obtained; adding a composite material of porous carbon nitride and silver bromide nanoparticles into deionized water, stirring, then adding the rhenium disulfide quantum dot dispersion liquid, continuously stirring, and then freeze-drying and drying; in the prepared nano composite photocatalytic material, p-g-C3N4 provides stable substrate and basic catalytic activity, AgBr widens the spectral response range and strengthens pollutant adsorption and degradation, ReS2 QDs optimizes charge transfer and improves hydrogen evolution kinetic efficiency, and efficient conversion of solar energy-chemical energy and efficient degradation of organic pollutants are achieved through cooperation of p-g-C3N4, AgBr and ReS2 QDs.

This invention belongs to the field of catalysis technology, specifically relating to a method for preparing cyclopentane derivatives from furan compounds. The method includes the following steps: mixing a furan compound, a copper-based catalyst, a halogen modifier, and a first solvent, and reacting them under a hydrogen atmosphere; the halogen modifier is at least one selected from sodium chloride, sodium bromide, potassium chloride, potassium bromide, chlorobenzene, and bromobenzene. This invention, by adding a halogen modifier to the catalytic system, introduces halogen components onto the surface of the copper-based catalyst to construct Cu-halogen active centers, achieving highly selective rearrangement of furan compounds into cyclopentane derivatives under relatively mild conditions, while significantly suppressing condensation side reactions, improving carbon utilization efficiency, and reducing dependence on the type of support.

The present application relates to a kind of absorbable bone hemostasis repair bracket, the absorbable bone hemostasis repair bracket includes the following weight parts of raw materials: excipient 15~60 parts, softening agent 15~60 parts and promote bone repair component 5~70 parts;The excipient includes polyoxyethylene-polyoxypropylene copolymer;The softening agent includes semi-solid mobile phase polymer;The promote bone repair component includes coating and core, the coating includes polylactic acid-glycolic acid copolymer, zinc stearate and potassium bromide, the core includes calcium phosphate salt particle, and the coating is wrapped in the surface of core.The preparation method includes the following steps: the preparation of promote bone repair component;The preparation of absorbable bone hemostasis repair bracket.The present application absorbable bone hemostasis repair bracket hemostasis anti-ability of scattering is strong, and has good inflammation regulation and promote bone repair effect.The present application absorbable bone hemostasis repair bracket can be used for any bone injury wound surface bone hemostasis and promote bone repair.

The method comprises the following steps: firstly, preparing ferric vanadate through a hydrothermal reaction and calcination, then reacting the ferric vanadate with bismuth nitrate and potassium bromide to synthesize ferric vanadate bismuth oxybromide composite particles, finally adding the composite particles into a solvent, mixing the composite particles with polyvinylidene fluoride and the like to prepare a membrane casting solution, and finally, preparing the membrane casting solution into the photocatalytic membrane. And standing, degassing, forming a film and curing to obtain the photocatalytic film. According to the method, the photocatalytic efficiency and the visible light utilization capability are improved by utilizing the bismuth oxybromide iron vanadate heterojunction, the bismuth oxybromide iron vanadate heterojunction is compounded into the polyvinylidene fluoride matrix, the problems of catalyst recovery and falling are solved, and the membrane is endowed with anti-pollution and self-cleaning capabilities. And the preparation process ensures sufficient construction of heterojunctions, good interfacial compatibility and complete membrane structure, so that interfacial charges are smoothly transferred, the structural defects are reduced, efficient synergy of photocatalysis and membrane separation technologies is realized, the antibiotic wastewater treatment effect is improved, and the method has a good application prospect.

The application discloses a green preparation method of 4,4'-difluorobenzophenone. The method uses 4,4'-difluorobenzene as raw material, potassium bromide as catalyst, acetic acid as solvent, and oxygen as oxidant, and 4,4'-difluorobenzophenone is generated in high selectivity through one-step oxidation under mild conditions. The application surprisingly finds that in the presence of potassium bromide, a new non-metallic catalytic oxidation system of potassium bromide / acetic acid / oxygen is used to realize high-efficiency and high-selectivity conversion of the C-H bond at the benzyl position. Compared with the traditional method, the application does not need to use a transition metal catalyst, does not need to use carbon tetrachloride and other materials damaging the ozone layer, and does not need to involve a dangerous intermediate such as a diazonium salt, the process route is short, the atomic economy is high, the product yield is high, the product purity is high, the catalyst is cheap and easy to obtain, and the application has excellent industrial application prospect and green chemistry characteristics.

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 material testing, in particular to an infrared transmission tabletting sample preparation method for a strong-absorptivity black material and an obtained tabletting slice. The method comprises the following steps: grinding dry potassium bromide, pressing into a transparent background sheet, and immediately collecting a background spectrum; and co-grinding 0.02-0.4 part by mass of the dried black sample and 100 parts by mass of dried potassium bromide, tabletting to obtain a gray light-transmitting sheet, and immediately measuring. The whole process is operated under an infrared baking lamp and in an environment with the humidity of less than or equal to 30%, tabletting parameters are strictly controlled, and'measurement while pressing 'is realized. Water peak interference can be effectively eliminated, the light transmittance, the signal-to-noise ratio and the baseline stability are remarkably improved, and the method is suitable for high-quality infrared characterization of high-absorptivity samples such as carbon materials, asphalt and ferrous metal materials.

The application discloses a ternary photocatalyst for degrading pharmaceutical wastewater and a preparation method and application thereof, and the preparation method comprises the following process: adding biochar powder into a potassium hydroxide solution, then adding melamine, and performing ultrasonic and stirring activation, and then drying, calcining, and naturally cooling, so as to obtain g-C3N4 / Biochar; the g-C3N4 / Biochar is added into a bismuth nitrate solution and uniformly mixed to obtain a solution A; potassium bromide is dissolved in a mixture of water and ammonia water to obtain a solution B, the solution B is slowly added into the solution A and stirred, and then centrifugation, washing and drying are performed, so as to obtain the ternary photocatalyst for degrading pharmaceutical wastewater. The application introduces another photocatalyst material on the basis of g-C3N4 material and biochar adsorption, and the photocatalytic capacity of the catalyst for the pharmaceutical wastewater is improved.

The invention belongs to the technical field of medicinal chemistry, and discloses a synthetic method of 4-bromo-2-methylpyrimidine-5-carboxaldehyde, which comprises the following specific steps: heating 3-methoxy-2-enitrile, trimethyl orthoacetate and ammonium acetate to react until the reaction is complete, and performing post-treatment to obtain 2-methyl-4-aminopyrimidine; continuously stirring and reacting with hydrochloric acid, sodium nitrite and potassium bromide until the reaction is complete, and performing post-treatment to obtain 4-bromo-2-methylpyrimidine; continuing to react with tartaric acid and urotropine in a heat preservation manner until the reaction is complete, and performing post-treatment to obtain the 4-bromo-2-methylpyrimidine-5-carboxaldehyde. The invention develops an efficient, simple, convenient and environment-friendly preparation method of 4-bromo-2-methylpyrimidine-5-carboxaldehyde, and has important significance for promoting the research and development of nitrogen benzene ring compounds and the development of related pharmaceutical chemistry fields.

The invention provides a preparation method of a multienzyme active nano-material and application of the multienzyme active nano-material in a diabetes wound healing material, and belongs to the technical field of nano-material preparation and wound healing treatment. Glucose, urea and potassium bromide jointly react with ruthenium salt and sodium hexachloroiridate (IV) in a water phase to form a porous foam precursor, then Joule thermal shock treatment is carried out in the air atmosphere, rapid calcination is achieved, the IrSAC-RuO2 nano-enzyme with Ir monatomic anchored to RuO2 is successfully constructed, the Ir monatomic metal loading capacity reaches up to 1.22-4.65 wt%, and the IrSAC-RuO2 nano-enzyme can be used for preparing an IrSAC-RuO2 nano-enzyme. The compound shows excellent POD enzyme activity, CAT enzyme activity, SOD enzyme activity and excellent antibacterial performance, and can significantly promote the repair of diabetic wounds.

The invention discloses a middle and far infrared optical film based on a potassium bromide film and a preparation method thereof, and relates to a far infrared band optical film technology. The anti-reflection film comprises a substrate, a front anti-reflection film system and a back anti-reflection film system, wherein the front anti-reflection film system is located on one side of the substrate, and the back anti-reflection film system is located on the other side of the substrate; the middle and far infrared optical film window is prepared by alternately depositing zinc selenide serving as a high-refractive-index film material and potassium bromide serving as a low-refractive-index film material. The middle and far infrared optical film based on the potassium bromide film provided by the invention can realize the anti-reflection of a wide spectrum with a far infrared band of 5-28 [mu] m, the average transmittance is 87.64%, and the highest value of the transmittance is 91.44%.

The invention discloses a metal Mg-mediated BiOBr photocatalyst as well as a preparation method and application thereof in photocatalytic carbon dioxide reduction, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following steps: adding bismuth nitrate pentahydrate into deionized water, violently stirring, and marking as a solution A; uniformly dispersing the ethylene glycol solution of potassium bromide, adding the ethylene glycol solution of magnesium nitrate, and marking as a solution B; and adding the solution B into the solution A, violently stirring, putting into a high-pressure kettle, carrying out hydrothermal reaction, and after the reaction is finished, cooling, washing and carrying out vacuum drying to obtain the Mg-mediated BiOBr photocatalyst. Compared with an existing photocatalyst, Mg-mediated BiOBr has good CO2 responsivity, separation and transfer of carriers can be accelerated through Mg mediation, and therefore the activity of photocatalytic reduction of CO2 is improved.

The invention discloses a synthesis method and application of a bismuth-rich bismuth oxybromide solid solution single crystal nanosheet for visible light driven full water decomposition. According to the method, bismuth oxide and lanthanum oxide are used as raw materials, a binary molten salt system of potassium bromide and lithium bromide is used as a bromine source, the bismuth-rich bismuth oxybromide solid solution single crystal is synthesized in situ, in the process, the stoichiometric ratio of the bismuth oxide to the lanthanum oxide is regulated and controlled, complete mutual dissolution of the lanthanum and the bismuth in crystal lattices can be achieved, and the bismuth-rich bismuth oxybromide solid solution single crystal is obtained. Therefore, the formed bismuth-rich bismuth oxybromide solid solution is stable in structure. The prepared bismuth-rich bismuth oxybromide solid solution monocrystal nanosheet has the advantages of simple synthesis process, good repeatability and the like, meets the requirements of large-scale production, not only has an energy band structure required by a full-water decomposition reaction, but also can effectively inhibit the compounding process of photo-induced electron-hole pairs, and is suitable for large-scale production. The separation efficiency and the surface migration rate of current carriers are remarkably improved, so that wide application prospects are shown.

The invention relates to a qualitative and quantitative method for isoliensinine perchlorate. The qualitative method comprises the following steps: weighing 1mg of isoliensinine perchlorate and 1mg of isoliensinine, uniformly grinding and tabletting the isoliensinine perchlorate and the isoliensinine with 100mg of potassium bromide respectively, acquiring an infrared spectrum of 4000-400cm <-1 > by adopting an infrared spectrometer, and comparing the spectrograms to find that the peak shapes of the isoliensinine perchlorate and the isoliensinine are similar, the peak shapes of the isoliensinine perchlorate and the isoliensinine perchlorate are common characteristic peaks and the peak shapes of the isoliensinine perchlorate are unique characteristic peaks of 625cm <-1 >. The quantitative method comprises the following steps: weighing a series of isoliensinine perchlorate reference substances with different masses, uniformly grinding and tabletting the isoliensinine perchlorate reference substances and 100mg of potassium bromide respectively, collecting an infrared spectrum, carrying out integration on a 625cm <-1 > characteristic peak to obtain a peak area, and drawing a standard curve by taking the peak area as a vertical coordinate and taking the sampling mass of the reference substances as a horizontal coordinate; the method comprises the following steps: weighing a sample to be detected, collecting an infrared spectrum, integrating a 625cm <-1 > characteristic peak to obtain a peak area, substituting the peak area into the standard curve equation, calculating the mass of the isoliensinine perchlorate in the sample, and substituting the mass of the isoliensinine perchlorate in the sample into the content calculation formula to obtain the content of the isoliensinine perchlorate in the sample. The method is good in precision, repeatability and stability, wide in linear range, high in linear correlation coefficient and high in recovery rate, the problem that an existing content determination method cannot avoid interference of isoliensinine is effectively solved, whether isoliensinine perchlorate is generated or not can be qualitatively judged, and the amount of isoliensinine perchlorate generated can be quantitatively detected. And a feasible new method is provided for production process optimization and quality evaluation of the isoliensinine perchlorate.

The invention discloses a device and a method for detecting the content of As (III) in a water body based on a paper-based micro-fluidic chip. The method is based on the chemical principle that arsenite reacts with potassium iodate under the acidic condition to generate an iodine simple substance, and rhodamine B is oxidized by the generated iodine simple substance under the catalytic action of a sulfuric acid medium and potassium bromide, so that the rhodamine B is subjected to a color fading reaction. According to the device, a fluid channel is prepared on a filter paper material, reagent dropwise adding areas and a reaction area are sequentially arranged, corresponding reagents are dropwise added into the reagent dropwise adding areas in sequence, then the reagents are converged to a main channel step by step through a micro-fluidic channel and are communicated to the reaction area, and the reagents are mixed in the micro-fluidic channel and subjected to a chromogenic reaction in the reaction area. The method comprises the following steps: shooting an image of a reaction area, extracting color parameters by using image processing software, and performing contrast calculation with a pre-established standard working curve to obtain the content of As (III) in the water sample. The technical problems that in the prior art, operation steps are complex, the detection period is too long, the detection portability of the arsenic content in the water body is poor, and the detection cost is too high are solved.

The application discloses a preparation method of a yttrium-doped BiOBr / In2O3 heterojunction composite photocatalyst, and specifically comprises the following steps: placing indium salt and urea in deionized water, stirring and uniformly mixing, reacting the mixture at 120-130 DEG C, performing solid-liquid separation on a reaction product to obtain a precipitate, and preparing In2O3 by washing, drying and calcining the precipitate; and placing In2O3, bismuth salt, yttrium salt and potassium bromide in deionized water, stirring and uniformly mixing, and then transferring into an autoclave to react at 170-190 DEG C to obtain the product; the catalyst has a lower band gap and a wider light absorption range, and the formation of the heterojunction reduces the recombination of electrons and holes; the introduction of Y (yttrium) increases the electron transmission, and the catalyst shows better photocatalytic activity, and has a great application prospect in the field of photocatalytic CO2 reduction.

The invention provides a multi-metal nano-enzyme as well as a preparation method and application thereof, and belongs to the field of nano-enzyme materials. The preparation method of the multi-metal nano-enzyme comprises the steps that a chloroauric acid solution and a sodium citrate solution are mixed for a first reduction reaction, and gold nanoparticles are obtained; dispersing the gold nanoparticles, mixing the dispersed gold nanoparticles with a chloroplatinic acid solution and an L-ascorbic acid solution, and carrying out a second reduction reaction to obtain Au / Pt nanoparticles; and mixing the Au / Pt nano particles, L-ascorbic acid, potassium bromide, polyvinylpyrrolidone and ethylene glycol for pretreatment, and then adding an ethylene glycol solution of a sodium hexachloroiridate (III) hydrate for a third reduction reaction to obtain the multi-metal nano enzyme. The multi-metal nano-enzyme prepared by the preparation method provided by the invention has high substrate affinity, catalytic performance and stability, and the multi-metal nano-enzyme has high detection sensitivity and stability on tumor markers when being used for lateral flow chromatography test strips.

The invention provides an ultrahigh-strength wear-resistant chinlon 6 industrial filament for a paper leading rope and a preparation method and application thereof, the preparation method comprises the following steps: preparing a nylon 6 antioxidant master batch, uniformly mixing the nylon 6 antioxidant master batch with chinlon 6 slices, and then carrying out melt extrusion, spinning, cooling, oiling, drafting setting and winding forming to prepare the chinlon 6 industrial filament, the nylon 6 antioxidant master batch is prepared from the following components in parts by weight: 100 parts of nylon 6 resin; 1-3 parts of cuprous iodide; 5-15 parts of potassium bromide; and 4-12 parts of a phosphite ester antioxidant. The preparation method has the beneficial effects that the process is optimized, so that the molecular chain is highly oriented, the breaking strength exceeds 8.25 cN / dtex, the maximum breaking strength can reach 8.67 cN / dtex, and the breaking strength is improved by more than 9% compared with that of a common nylon 6 product; the strength retention rate reaches 91.7%-92.3% and is increased by more than 3 times; the filament has high strength, high wear resistance and weather resistance, can meet the harsh requirements of paper leading ropes in the papermaking industry, prolongs the service life and reduces the replacement frequency.

The invention discloses a method for preparing infrared window material potassium bromide through hot pressing. The method comprises the following steps: adhering a polyimide adhesive tape to the opposite surfaces of an upper mold and a lower mold of a hot press; a sleeve is arranged on the lower die, the ground potassium bromide powder is placed on the polyimide adhesive tape of the lower die, time, temperature and pressure are set, and after the temperature is increased to the preset temperature and kept for 30 min, the upper die starts to conduct pre-pressing at the first pressure for the first time and then conducts hot pressing at the second pressure for the second time; taking out the sleeve after hot pressing, and pushing out the potassium bromide film by using a reverse mold rod. The potassium bromide window sheet is prepared by adopting a hot pressing process, on one hand, at the temperature higher than 100 DEG C, the influence of water on potassium bromide is eliminated, the polyimide adhesive tape is pasted, the flowability among particles is improved, and the transparency of the potassium bromide window sheet is integrally improved; on the other hand, the potassium bromide particles are combined through pressure, and the mechanical performance of the potassium bromide window sheet is improved.

The method comprises the following steps: putting a to-be-detected gasoline sample, a potassium bromate-potassium bromide aqueous solution and an inorganic acid aqueous solution into a closed container for reaction to obtain a pretreated gasoline sample; the comprehensive two-dimensional gas chromatograph is adopted for detecting the content of saturated hydrocarbon, aromatic hydrocarbon and olefin in the pretreated gasoline sample, the saturated hydrocarbon, the olefin and the aromatic hydrocarbon can be separated and measured, and the content of gasoline family components can be measured; meanwhile, the measuring speed is high, and the accuracy is high.

The application discloses a preparation method of a bromo gem-difluoro allyl bicyclo[1,1,1]pentane compound in the technical field of organic synthesis, and the method takes [1,1,1] spiropropyl, alpha, alpha, alpha-trifluoromethyl aryl olefin or a derivative thereof and potassium bromide as starting materials, and under the conditions of 2,4,5,6-tetrakis(9 H Under the conditions of taking 2,4,6-trimethylpyridine as an organic photocatalyst, 2,4,6-trimethylpyridine as a base and acetone as a solvent, bromide is oxidized into bromine free radicals under visible light excitation, then the free radicals are added to [1,1,1] spiropropyl through tension ring release, to form bromo bicyclo[1,1,1] pentane free radicals, and then the free radicals are added to alpha, alpha, alpha-trifluoromethyl aryl olefin, and through reduction and defluorination, the bromo gem-difluoro allyl bicyclo[1,1,1] pentane compound is obtained, the optimized reaction condition of the application is mild and green, the substrate has good universality, and the reaction yield is high, so that the application is a new method for preparing the bromo gem-difluoro allyl bicyclo[1,1,1]pentan compound.

The invention belongs to the technical field of photocatalysis, and particularly discloses a modified carbon nitride-based composite photocatalyst as well as a preparation method and application thereof. According to the composite photocatalyst, graphite-phase carbon nitride (g-C3N4) is taken as a matrix, and a cyano-functionalized potassium ion-doped electronic structure system is constructed through a synergistic modification strategy of combination of ammonia gas pretreatment and potassium bromide post-treatment. The preparation method is simple in process, mild in condition and low in cost. The composite photocatalyst is driven by visible light, the generation rate of hydrogen peroxide prepared through photocatalysis by taking water and oxygen as raw materials reaches up to 3.824 mmol.g <-1 >. H <-1 >, is 48 times of that of unmodified carbon nitride (g-C3N4), and is 2.1 times of that of only KBr doped carbon nitride (g-C3N4-KBr), and the composite photocatalyst has high selectivity and good cycle stability, and can be used for preparing hydrogen peroxide. The problems that an existing hydrogen peroxide synthesis technology is large in pollution and insufficient in catalyst activity are solved, and the method has wide industrial application prospects in the fields of clean energy synthesis and green chemical engineering.