265 results about "Aqueous sodium hydroxide" patented technology

The invention discloses an alkali-washable aluminum foil etching gravure printing UV ink. The gravure UV ink comprises the following components in parts by weight: 30-50 parts of a UV prepolymer, 20-30 parts of a UV monomer, 6-20 parts of an initiator, 10-30 parts of an inorganic filler, 1-5 parts of a pigment, 0.1-3 parts of a dispersant, 0.1-2 parts of a leveling agent, 0.1-2 parts of a defoaming agent and 0.1-2 parts of an adhesion aid. According to the gravure UV etching protection ink, the special UV prepolymer and the UV monomer are matched with the filler, so that the prepared gravure UV etching protection ink not only has excellent aluminum foil adhesive force, but also has excellent corrosion resistance of hot hydrochloric acid, particularly provides effective protection for circuit edges, and meanwhile, the gravure UV etching protection ink can rapidly retreat a film in a sodium hydroxide aqueous solution with the concentration of 1% or above and the temperature of 40 DEG C, so that the service life of the gravure UV etching protection ink is prolonged. When the prepared gravure UV ink is used for gravure printing, diffusion of knife lines and printing lines cannot be generated, and possibility is brought to cost reduction and efficiency improvement of the industry.

The invention belongs to the field of egg by-product processing, and particularly relates to a preparation method and application of eggshell membrane peptides, the preparation method of the eggshell membrane peptides comprises the following steps: S1, drying and crushing cleaned eggshells, and then separating eggshell membranes; s2, putting the eggshell membrane into a steam explosion machine, carrying out pressure maintaining treatment for 1-5 minutes under the pressure of 1.0-1.5 MPa, then instantly releasing the pressure, and collecting a steam explosion sample; s3, adding the eggshell membrane subjected to steam explosion treatment into a sodium hydroxide aqueous solution with the pH value of 7-9 according to the solid-liquid ratio of 1: (20-30), then adding alkaline protease according to the enzyme addition amount of 5000-15000U / g, carrying out enzymolysis for 5-10 hours at the temperature of 35-65 DEG C, then inactivating for 3-5 minutes at the temperature of 100 DEG C, filtering enzymatic hydrolysate, taking filtrate, centrifuging, taking supernate, and freeze-drying to obtain polypeptide; s4, polypeptide obtained in S3 is dissolved in an activation solution to be activated for 8-10 h at the temperature of 4-8 DEG C; and S5, separating the sample activated in the step S4 through a Sephadex G-15 chromatographic column to obtain the activated eggshell membrane peptide. Based on the method, the preparation efficiency is high, and the prepared eggshell membrane peptide is high in antioxidant activity.

The invention belongs to the technical field of preparation and application of nano materials, and relates to a preparation method and application of amino-functionalized cerium oxide nano enzyme, and the preparation method comprises the following steps: adding 3-aminophenylboronic acid into a cerous nitrate hexahydrate aqueous solution to obtain a mixed solution; dropwise adding a sodium hydroxide aqueous solution into the mixed solution, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain milk white powder, namely the amino-functionalized cerium oxide nano-enzyme. The boron element is introduced in the preparation of the cerium oxide nano-enzyme, and the amino-functionalized cerium oxide nano-enzyme is prepared by adopting a simple one-step hydrothermal synthesis method, so that the nano-enzyme has good phosphatase-like activity, has high selectivity and sensitivity to LPS, and is short in detection time, high in sensitivity, low in detection limit, simple in preparation process and high in preparation efficiency; the product is good in quality, high in stability, environment-friendly and extremely wide in market prospect.

The invention provides a method for continuously synthesizing 2-thiophenecarboxaldehyde by using a continuous flow reactor, and relates to the technical field of organic synthesis, and the method comprises the following steps: mixing thiophene and N, N-dimethylformamide (DMF) to form a material A; continuously inputting the material A and phosphorus oxychloride (POCl3) into a micro-channel continuous flow reactor through a high-pressure feeding pump, and controlling the reaction temperature to be 60-150 DEG C and the retention time to be 0.5-5 minutes; synchronously inputting the reaction liquid output by the micro-channel reactor and a sodium hydroxide aqueous solution into a dynamic tubular reactor, and carrying out hydrolysis reaction at 10-70 DEG C for 0.5-5 minutes; according to the method, the 2-thiophenecarboxaldehyde is obtained by extracting the 2-thiophenecarboxaldehyde by using dichloromethane (DCM), and a continuous flow reactor technology is adopted, so that the reaction efficiency is remarkably improved. Compared with the traditional batch reaction, the continuous flow reactor has higher mass transfer and heat transfer efficiency, can realize rapid reaction, shortens the reaction time, and improves the product yield at the same time.

The invention relates to the technical field of water-based binders, in particular to a preparation method of a high-flexibility positive electrode water-based binder and a product of the high-flexibility positive electrode water-based binder, and the preparation method at least comprises the following steps: dissolving acrylamide in deionized water, and sequentially adding carboxylic acid monomers, acrylonitrile and acrylate monomers to obtain a mixture A; heating the mixture A to 50-60 DEG C under the protection of inert gas, dropwise adding an initiator, filtering, and washing to obtain a solid precipitate; and adding a sodium hydroxide aqueous solution into the solid precipitate to obtain the high-flexibility positive aqueous binder. A polymerization precipitation process is adopted, the solid content of the mixture A is controlled to be 45-60 wt%, the reaction temperature is controlled to be 50-60 DEG C, and the synthesized water-based adhesive has good flexibility and peel strength while maintaining the viscosity of 5000-20000 mPa.s.

The invention discloses a synthesis method of 2, 4, 5-trifluorophenylacetic acid, which comprises the following steps: by taking cheap and easily available o-chloronitrobenzene as a raw material, reacting with sodium nitrate in a sulfuric acid and trifluoroacetic acid system, separating generated 2, 4-dinitrochlorobenzene through melt crystallization, and continuing to synthesize 2, 4-dinitrochlorobenzene in methyl chloroacetate to obtain 2, 4, 5-trifluorophenylacetic acid. The method comprises the following steps: carrying out indirect aromatic nucleophilic substitution reaction on 2, 4-dinitrophenylacetic acid under the condition of sodium hydride to generate 5-chloro-2, 4-dinitrophenylacetic acid methyl ester, separating, carrying out fluorination reaction on the 5-chloro-2, 4-dinitrophenylacetic acid methyl ester and potassium fluoride under the action of a phase transfer catalyst, carrying out rectification separation to obtain 2, 4, 5-trifluorophenylacetic acid, and carrying out hydrolytic acidification on the 2, 4, 5-trifluorophenylacetic acid in a sodium hydroxide aqueous solution to obtain 2, 4, 5-trifluorophenylacetic acid. And the process route is safer, more environment-friendly, more efficient and lower in cost.

The invention discloses a preparation method and application of a functional nano-pesticide based on a random combinatorial library of polyhexamethylene biguanide hydrochloride analogues and phenolic hydroxyl group-containing natural small molecules. A PHMB analogue containing a mono-guanidyl or biguanidyl structure and a natural small molecule compound with 1-3 phenolic hydroxyl structures are selected, nano-particles with good dispersion coefficients can be formed in a sodium hydroxide aqueous solution with the pH value of 9-11 without additional carriers or stabilizers, and the limitation that traditional nano-pesticides depend on macromolecular carriers is broken through. The obtained nano-particles can be enriched on the surface of a plant pathogenic fungus cell membrane by utilizing the electrostatic adsorption effect of guanidyl, and the delivery effect of natural small molecules is enhanced, so that the antifungal activity of the nano-particles is improved. An antibacterial experiment result shows that part of the composition has a synergistic antibacterial effect on fusarium graminearum, and the diameter of an inhibition zone is superior to that of a single component. The method is high in construction efficiency, has good expansibility, can form a nano pesticide preparation library, and is suitable for plant disease prevention and control and environment-friendly material development.

The invention discloses an antibacterial and deodorant functional fabric and a preparation method thereof, and relates to the technical field of textile fibers. When the antibacterial and deodorant functional fabric is prepared, pre-modified titanium dioxide reacts with diallyl chlorophosphate to prepare modified titanium dioxide; the preparation method comprises the following steps: carrying out polycondensation on hydroxypropyl-terminated polydimethylsiloxane, ethylene glycol, 3, 5-pyridinedicarboxylic acid and terephthalic acid to prepare polyester, and reacting with 4-chloromethylstyrene to prepare modified polyester; carrying out melt spinning on the modified polyester and the modified titanium dioxide to obtain polyester fibers; spinning polyester fibers to obtain a fiber fabric; carrying out coprecipitation on the carboxylated beta-cyclodextrin and tea polyphenol to prepare a carboxylated beta-cyclodextrin inclusion compound; the preparation method comprises the following steps: mixing a polyester fabric with a sodium hydroxide aqueous solution to prepare an alkali-treated polyester fabric, and immersing the alkali-treated polyester fabric into a carboxylated beta-cyclodextrin inclusion compound aqueous solution to prepare the antibacterial and deodorant functional fabric. The antibacterial and deodorant functional fabric prepared by the invention has good antibacterial, deodorant, flame-retardant and mechanical properties.

The invention discloses a bismuth vanadate material for carbon dioxide electroreduction and a preparation method and application, and belongs to the technical field of carbon dioxide electroreduction.The method comprises the steps that bismuth salt is dissolved in a nitric acid aqueous solution, a surfactant is added, and a mixed solution A is obtained through a stirring reaction; dissolving ammonium metavanadate in a sodium hydroxide aqueous solution, adding a surfactant, and carrying out a stirring reaction to obtain a mixed solution B; and mixing the mixed solution A and the mixed solution B, adjusting the pH value to be neutral, and carrying out stirring reaction, hydrothermal reaction, washing, drying and calcination reaction to obtain the bismuth vanadate material for carbon dioxide electroreduction. The preparation method comprises the following steps: uniformly mixing bismuth salt and ammonium metavanadate with a surfactant respectively, and roasting through a hydrothermal method and a template effect of the surfactant to prepare the bismuth vanadate material with high specific surface area for electroreduction of carbon dioxide. In carbon dioxide electroreduction, the catalyst has catalytic performance of high activity, good stability and high selectivity and electrochemical performance of low overpotential and high current density.

The invention provides a carbon-supported platinum-cobalt-copper multifunctional alloy catalyst and a preparation method and application thereof, and belongs to the technical field of energy materials. Wherein the nanocarbon carrier solution is mixed with a chloroplatinic acid solution, a cobalt chloride solution and a copper chloride solution, a sodium hydroxide aqueous solution is added to adjust the pH value, ultrasonic dispersion and stirring are performed to obtain turbid liquid, and the molar ratio of platinum ions to cobalt ions to copper ions is 2: (0.5-1): (0.5-1); then, putting the turbid liquid into a reaction kettle, and reacting at 120-250 DEG C for 1-6 hours to obtain a black colloidal solution; then filtering, washing and drying the black colloidal solution to obtain black powder; and finally, carrying out acid treatment on the black powder, and grinding to obtain the carbon-loaded platinum-cobalt-copper multifunctional alloy catalyst. The catalyst is used for catalyzing an oxygen reduction reaction of a cathode in a hydrogen fuel cell and / or a methanol fuel cell, and / or catalyzing a methanol oxidation reaction of an anode in a direct methanol fuel cell.

The invention discloses a zinc oxide modified silicon dioxide catalyst, a preparation method and application of the zinc oxide modified silicon dioxide catalyst in catalytic alcoholysis of waste PET (polyethylene terephthalate), zinc acetate and silicon dioxide are added into a mixed solution of water and ethanol and uniformly mixed, and a mixed reaction solution is obtained; adding a sodium hydroxide aqueous solution into the mixed reaction solution, carrying out a first reaction, and standing to obtain a suspension; and adding an L-ascorbic acid aqueous solution into the suspension, carrying out a second reaction, carrying out solid-liquid separation, and calcining the solid part in an air atmosphere to obtain the product. The prepared zinc oxide modified silicon dioxide nano material can be used as a catalyst to be applied to alcoholysis recovery of waste polyester, the product yield reaches up to 92% or above, the product selectivity is high, metal residues are avoided, the catalyst is easy to recover and can be recycled, and the application prospect is wide.

The invention discloses a copper oxide / cuprous oxide heterogeneous nano-material with chiral morphology and a preparation method thereof, and the method comprises the following steps: 1, mixing a copper salt aqueous solution and a surfactant aqueous solution to obtain a mixed solution A, taking a chiral ligand aqueous solution to add into the mixed solution A under a stirring state, and stirring at room temperature to obtain a copper oxide / cuprous oxide heterogeneous nano-material; a copper ion reaction precursor solution is obtained; and 2, adding a sodium hydroxide aqueous solution into the copper ion reaction precursor solution, stirring at room temperature to obtain a mixed solution B, transferring the mixed solution B into a hydrothermal reaction kettle, putting the hydrothermal reaction kettle into a drying oven, reacting at 120-160 DEG C for 2-6 hours, after the reaction is finished, centrifugally separating out a precipitate, and sequentially washing and drying in vacuum to obtain the copper ion catalyst. The copper oxide / cuprous oxide heterogeneous nano material with chiral morphology is obtained. The preparation method is simple, low in cost and easy to implement, and the obtained chiral copper oxide / cuprous oxide heterogeneous nano material has good structural stability and crystallinity.

The invention belongs to the technical field of high polymer materials, and particularly discloses closed-loop recyclable high-thermal-conductivity liquid crystal epoxy resin and a preparation method thereof. Comprising the following steps: mixing 4, 4-dihydroxybiphenyl, a binary carboxyl compound and a catalyst, and reacting to obtain the carboxyl-terminated biphenyl polyester. And cross-linking the carboxyl-terminated biphenyl polyester and bisphenol A epoxy resin to obtain the high-thermal-conductivity liquid crystal epoxy resin capable of being recycled in a closed-loop manner. The high-thermal-conductivity liquid crystal epoxy resin capable of being subjected to closed-loop recovery can be subjected to closed-loop recovery and rapid degradation in a sodium hydroxide aqueous solution at normal temperature. The obtained closed-loop recyclable high-thermal-conductivity liquid crystal epoxy resin has excellent mechanical properties, thermal conductivity, self-repairing performance and recycling performance, is simple in preparation process, and is expected to be applied to the fields of microelectronic devices, electrical insulation equipment and the like.

The invention provides a fibrous degradable flexible pressure sensor with ultralow detection limit and a preparation method and application thereof.The preparation method comprises the steps that lignin powder is dispersed in a sodium hydroxide aqueous solution, ultrasonically crushed and stirred to be uniform, then polyethylene oxide powder is uniformly dissolved in the solution in four times, stirring is conducted till the solution is uniform, and the pressure sensor is obtained; putting the solution into a vacuum cavity, and removing bubbles at room temperature to obtain an electrostatic spinning precursor solution; then preparing a lignin fiber thin film by adopting an electrostatic spinning process, and then drying the thin film; and finally, cutting the obtained lignin fiber film into a square film, placing an interdigital electrode mask on the square film, spraying a metal silver nanowire electrode by using a silver nanowire solution, and then embedding the fiber film in a polyimide film to prepare the flexible pressure sensor. According to the invention, the integrated design of the capacitive pressure sensor is realized, the cost is low, the process is simple, and the pressure sensor has excellent flexibility and sensitivity.

The invention discloses a laser-induced lignin-derived porous carbon wave-absorbing material and a preparation method thereof, and belongs to the field of material preparation and microwave absorbing materials. The method comprises the following steps: dissolving lignin in a sodium hydroxide aqueous solution, and uniformly mixing with a polyethylene oxide aqueous solution to obtain a lignin ethylene oxide solution; the method comprises the following steps: preparing a lignin membrane by using a lignin ethylene oxide solution, performing laser irradiation, washing, performing suction filtration, and performing vacuum drying to obtain the laser-induced lignin-derived porous carbon wave-absorbing material. The lignin-derived porous carbon material prepared by taking industrial waste lignin as a raw material has the performance characteristics of being harmonious, low in density, high in reflection loss and wide in wave band absorption. The preparation method is green, environment-friendly, simple to operate and low in cost, and the waste lignin in the papermaking industry is successfully converted into a high-value adjustable functional material. The method meets actual application requirements and has huge application potential in the technical field of microwave absorbing materials.

The invention belongs to the technical field of sodium hypochlorite production, and particularly relates to a method for producing sodium hypochlorite. A method for producing sodium hypochlorite comprises the following steps: adding a compound additive into a sodium hydroxide aqueous solution, and uniformly stirring to obtain a compound alkali-containing raw material solution; respectively introducing the composite alkali-containing raw material solution and chlorine into the micro-channel reactor through a metering pump, and controlling reaction conditions to generate a reaction solution containing sodium hypochlorite; introducing the reaction liquid into a ceramic membrane separation device, separating and removing unreacted solid impurities and by-product salts, and collecting permeate; unreacted sodium hydroxide is recycled and reused; and detecting the permeate liquid to be qualified to obtain a sodium hypochlorite finished product. According to the invention, four key links of compound additive addition, microchannel reaction, ceramic membrane separation and resin recovery are organically linked to form a systematic solution. Aiming at the core pain points of insufficient reaction, more byproducts, raw material waste, equipment corrosion and the like in the traditional process, the product purity is improved through the synergistic effect of all links.

The present disclosure provides a preparation method of a porous hydrogel adsorbent based on Radix astragali residues, including the following steps: subjecting residues of Chinese herbal medicine Radix astragali as a precursor to bleaching with NaClO2, alkaline washing with KOH, and high power ultrasonic treatment, thereby obtaining a precursor solution of uniformly dispersed cellulose nanofibers (CNFs); adding the precursor solution of CNFs to a mixed solution of N,N′-methylene bisacrylamide (MBA), acrylic acid (AA) and ammonium persulfate (APS), shaking evenly, and initiating a polymerization reaction at a predetermined temperature to form a monolithic gel; and cleaning the monolithic gel, putting the cleaned monolithic gel into a dimethyl sulfoxide (DMSO) solution containing epichlorohydrin to allow reaction, and transferring the product of the reaction to an aqueous sodium hydroxide solution containing triethylene tetramine to allow reaction, thereby finally obtaining an amino-functionalized porous hydrogel adsorbent.

The present invention belongs to the field of pharmaceutical synthesis technology, and in particular to a new crystal form of fosfomycin sodium and its preparation method and application. The X-ray powder diffraction pattern of the new crystal form of fosfomycin sodium has characteristic peaks at the following 2θ angle positions: 6.59 ± 0.2°, 6.90 ± 0.2°, 15.88 ± 0.2°, 18.43 ± 0.2°, 18.72 ± 0.2°, 20.94 ± 0.2° and 30.65 ± 0.2°. Its preparation method includes: fosfomycin left phosphorus right amine salt is dissolved in sodium hydroxide aqueous solution, liquid separation, water layer is added to alcohol solvent and stirred for crystallization, filter cake is washed after filtration, filter cake is passed through saturated water nitrogen and purged to the filter cake surface to appear molten state, vacuum drying, obtains fosfomycin sodium new crystal form. Fosfomycin sodium provided by the present invention is a hemihydrate crystal form, and its hygroscopicity is low, which is more conducive to subpackaging and mixing in production.

The invention discloses a preparation method of an arfamarana key intermediate, which comprises the following steps: carrying out nucleophilic addition reaction on a compound I and 1-[3-chloro-5-(trifluoromethyl) phenyl]-2, 2, 2-trifluoroethanone under the action of an organic solvent A and alkali to obtain a compound II; dissolving the compound II in an organic solvent B, adding concentrated sulfuric acid, carrying out intramolecular dehydration and cyanogen hydrolysis, and after the reaction is finished, cooling to room temperature for crystal growing to obtain a compound III; dissolving the compound III in an organic solvent C, carrying out intramolecular cyclization and ester hydrolysis reaction on the compound III and hydroxylamine hydrochloride under the action of a certain amount of sodium hydroxide aqueous solution, and after the reaction is finished, collecting a water phase and adjusting the pH value of the water phase, so as to obtain the key intermediate of arfampanaga. The reaction in each step has a high conversion rate, the purity of the prepared arfamarin intermediate is high, and powerful support and guarantee are provided for preparation of high-purity arfamarin.

The utility model relates to the technical field of waste oil regeneration, and discloses a waste white oil alkali washing device which comprises a tank body, a heating assembly is installed on the periphery of the tank body, a sleeve, a servo motor and a feeding pipe are sequentially and fixedly connected to the top of the tank body from left to right, and a liquid discharging pipe is fixedly connected to the bottom of the tank body. A stirring assembly is installed in the tank body, a top ring is slidably connected to the middle of a sleeve, a filtering barrel is fixedly connected to the bottom of the top ring, a connecting pipe is fixedly connected to the top of the top ring, an elastic assembly is installed in the middle of the top ring, a clamping block is slidably connected to the middle of the top ring, and a clamping groove is formed in the middle of the sleeve; and the middle part of the sleeve is slidably connected with a push rod. According to the utility model, firstly, waste white oil is input through the connecting pipe, and larger impurities can be filtered under the action of the filtering barrel at the bottom of the connecting pipe, so that the mixing efficiency of the waste white oil and a sodium hydroxide aqueous solution is ensured, and the impurities are prevented from blocking the pipeline.

The invention provides polyimide and a preparation method thereof. The preparation method comprises the following steps: adding a sodium hydroxide aqueous solution into a monomer solution containing a dianhydride monomer and an aprotic solvent, mixing, adding diisocyanate, carrying out a polymerization reaction to obtain a reaction product system, and precipitating from the reaction product system to obtain polyimide, wherein the feeding time of the diisocyanate is 4 to 5 hours; in the monomer solution, the molar concentration of the dianhydride monomer is 0.5-0.6 mol / L; the obtained polyimide has the advantages of high specific concentration viscosity, high molecular weight and excellent high temperature resistance.

The invention discloses a 2-hydroxy-benzonitril solution and a production method thereof, the production method comprises the step of preparing a wet 2-hydroxy-benzonitril product through reaction of salicylamide and phosgene, and is characterized in that the wet 2-hydroxy-benzonitril product is directly added into a sodium hydroxide aqueous solution to obtain the 2-hydroxy-benzonitril solution. The sodium salt solution can be directly produced without taking out the 2-hydroxy-benzonitril, so that exposure of the 2-hydroxy-benzonitril is avoided, personal injury is reduced, investment of drying equipment is reduced, and direct feeding of downstream products is facilitated.

The invention belongs to the technical field of drug synthesis, and particularly relates to a beraprost sodium preparation method, which comprises: (1) adding beraprost into a methanol solution, and adding a sodium hydroxide aqueous solution to carry out a reaction to form a salt; (2) after salifying, concentrating under reduced pressure, and adding an organic solvent for concentrating again; and (3) after the concentration is finished, adding an organic solvent, heating and dissolving, then slowly cooling to 0-5 DEG C, crystallizing, filtering and drying to obtain the beraprost sodium. The synthesis method is simple, convenient to operate, low in cost, high in efficiency, short in production period and suitable for industrial production.

The utility model relates to a photosensitive ink removing device for etching a miniature loudspeaker end cover, and belongs to the technical field of loudspeaker end cover processing, the photosensitive ink removing device comprises a basket, a soaking mechanism and a flushing mechanism arranged beside the soaking mechanism, the soaking mechanism comprises a soaking pool, a strip-shaped rack, a waterproof gear motor, a guide rail, a sliding rail, a base and a mounting seat, the strip-shaped rack, the guide rail and the sliding rail are all installed at the bottom of the soaking pool in the length direction of the soaking pool, the base is connected to the sliding rail in a sliding mode, and the waterproof gear motor is installed on the base. In the soaking process, the whole basket can perform wave-shaped motion, so that the aluminum plate is driven to swing left and right in a solution, on one hand, the aluminum plate swings left and right to stir the solution to generate turbulent flow, so that the solubility of a sodium hydroxide aqueous solution is uniformly distributed, and on the other hand, falling of ink floating skin can be accelerated; and the ink removal efficiency is greatly improved, and the labor intensity of workers can be relieved.

The invention discloses a preparation method of a glucose-iron-zinc double complex, which comprises the following steps: dissolving glucose in water, adding ferrite under a stirring condition, uniformly stirring, adjusting the pH value to 7.5-8.5 by using a sodium hydroxide aqueous solution, and stirring and reacting at 70-90 DEG C for 1-2 hours to obtain a reaction solution A; adding zinc salt into the reaction liquid A, uniformly stirring, adjusting the pH value to 8.0-9.0 by using a sodium hydroxide aqueous solution, and stirring and reacting at 70-90 DEG C for 1-2 hours to obtain a reaction liquid B; and carrying out microwave treatment on the reaction liquid B, adding an ethanol water solution under a stirring condition, standing at normal temperature, separating out precipitate, and carrying out vacuum drying on the precipitate to obtain the glucose-iron-zinc double complex. Glucose sequentially reacts with ferrous salt and zinc salt, metal ions are complexed, the glucose-iron-zinc double complex is prepared, and the glucose-iron-zinc double complex is good in stability, good in solubility and easy to absorb, is added into animal feed, is high in bioavailability and can promote growth and development of animals, reduce the diarrhea rate and improve the health level of the animals.

The invention relates to the technical field of preparation of inorganic chemical materials, and discloses a controlled synthesis process of a high-temperature-resistant sodium antimonate crystal structure, which comprises the following steps: dispersing antimony trioxide in a sodium hydroxide aqueous solution with the initial concentration of 6.5-8.0 mol / L, and adding sodium metaaluminate as a lattice directing agent to prepare a precursor base solution; heating the base solution, maintaining turbulent stirring, executing double-flow-path synchronous compensation, dropwise adding a hydrogen peroxide aqueous solution and synchronously adding sodium hydroxide; the method comprises the following steps: dynamically setting a coupling relationship among an alkali supplementing rate, an oxidation rate and a reaction stoichiometric ratio, counteracting a dilution effect of water generated by reaction and solvent water in real time, and maintaining the concentration of free sodium hydroxide in a mother solution in the whole reaction process at 6.0 mol / L or above until a reaction endpoint is reached. The path of lattice interstitial water or surface hydroxyl is blocked, anhydrous sodium antimonate without crystal water removal steps in the whole temperature range is prepared, and the foaming problem in high-temperature processing is solved.

This invention discloses an acid and alkali resistant polyamide membrane and its preparation method. The method is as follows: S1: Immerse the ultrafiltration base membrane in an aqueous sodium hydroxide solution for soaking and then set aside; S2: Treat the base membrane with a mixed aqueous solution of polyamine and aziridine crosslinking agent; S3: Wet the base membrane in an organic phase solution of polyacrylamide monomer to obtain a polyamide composite membrane; S4: Immerse the prepared polyamide composite membrane in an alcoholic solution of hydroxymethyl crosslinking agent, then dry it in a forced-air drying oven, and after washing with water, obtain the acid and alkali resistant polyamide membrane. This application uses two crosslinking agents, aziridine and hydroxymethyl, which can undergo specific crosslinking reactions with the carboxyl groups inside the polyamide membrane, to directly perform dual crosslinking modification on the membrane interior and surface, without introducing other polymer materials to avoid excessive increase in membrane permeation resistance. The polyamide membrane prepared by this method has both good acid and alkali resistance and water permeability.

The invention discloses a preparation method of a hierarchical pore molecular sieve and a characterization method of a Ce setting condition in the molecular sieve, relates to the technical field of molecular sieves, and improves the utilization efficiency of rare earth elements in a Y-type molecular sieve. The xCeHY-J takes a hierarchical pore molecular sieve HY-J as a carrier, and the x is equal to 1-5wt% of Ce. The method comprises the following steps: dispersing a NaY molecular sieve in an ethylene diamine tetraacetic acid aqueous solution, refluxing and stirring, then centrifuging, washing and drying, dispersing the obtained solid product in a sodium hydroxide aqueous solution, stirring, then centrifuging, washing and drying, dispersing in an ammonium nitrate aqueous solution, stirring for ion exchange, centrifuging, washing and drying the product, and thus obtaining the product. And dispersing the hierarchical pore HY-J molecular sieve in deionized water, dropwise adding a cerium nitrate aqueous solution, stirring, drying by distillation, and calcining to obtain the xCeHY-J molecular sieve. The catalytic cracking catalyst can be applied to a catalytic cracking process in a crude oil secondary processing technical system.

The invention provides an epoxy resin curing agent containing MOFs as well as a preparation method and application thereof, and the preparation method comprises the following steps: S1, dissolving an organic ligand in an N, N-dimethylformamide (DMF) solution, and dropwise adding a sodium hydroxide aqueous solution into the organic ligand solution to obtain disodium salt; s2, dissolving the disodium salt precipitate obtained in the step (1) in distilled water; slowly dropwise adding 10mL of deionized water into manganese chloride, stirring and dissolving, adding a disodium salt aqueous solution, mixing, and carrying out vacuum drying to obtain a metal organic framework material Mn-NPA; s3, heating the Mn-NPA, and carrying out vacuum drying and activation on the Mn-NPA; s4, Mn-NPA and an imidazole compound are mixed for a load reaction; and S5, filtering and drying the reacted mixture to obtain the epoxy resin curing agent containing MOFs. According to the epoxy resin curing agent containing MOFs, an epoxy resin coating can be prepared into a single component, and the epoxy resin curing agent can be used once a cover is opened and is convenient to use and easy to construct.

The invention relates to the technical field of solid waste material recycling, in particular to a solid waste-based geopolymer and a preparation method thereof. The solid waste-based geopolymer comprises the following components in parts by mass: 400-500 parts of fly ash; 400 to 500 parts of mineral powder; 40-60 parts of a sodium hydroxide aqueous solution; 200 to 400 parts of water; the solid content of the nano waterborne epoxy emulsion is 30-62%, the particle size of the nano waterborne epoxy emulsion is 100-900 nm, and the nano waterborne epoxy emulsion accounts for 3-9% of the total mass. According to the invention, the compactness of a matrix is enhanced, shrinkage cracking caused by water evaporation is reduced, the toughness and anti-permeability of the material are improved, the compactness of an interface is enhanced, the saltpetering condition of the matrix is inhibited, and wide application in the field of building materials is facilitated.