11results about How to "The method is simple and controllable" patented technology

The present invention discloses a method for repairing concrete cracks at low temperature, its application and a concrete crack repairing agent, which belongs to the technical field of on-site processing of building materials and repair of existing buildings. In the method for repairing concrete cracks at low temperature of this scheme, a repairing agent with a low-temperature early strength agent of a string-stool-type structure component is used. The low-temperature early strength agent of the string-stool-type structure component is obtained by first subjecting the string-stool-type structure main chain obtained by ring-opening polymerization to an alkali-catalyzed reaction to obtain an incompletely condensed string-stool-type structure, and then reacting with the monomers to substitution-catalysis-copolymerization and substitution-ATRP reaction. This scheme can reduce the viscosity of the repair material by adding a low-temperature early strength agent of a string-stool-type structure component to the repair material, improve its early strength, fast hardening and adaptability, and is particularly suitable for repairing concrete cracks in a low-temperature environment. The repair material has simple components and good compatibility with concrete at the crack, and can effectively solve the problems of poor adaptability, high viscosity and low strength of the repair material, and has broad prospects for promotion and application.

This invention discloses a method for preparing sulfonamide-modified benzo[a]fluorene-5-one derivatives, using 1,7-enyne and N Using sulfonylaminopyridine salts as raw materials, a series of sulfonated benzo[a]fluorene-5-one compounds were successfully synthesized by catalyzing the sulfonation / cyclization tandem reaction of 1,7-enynes under photocatalytic conditions. This method has excellent functional group tolerance and high economic applicability.

The invention discloses a zirconium hydroxide powder material and a preparation method and defluorination application thereof. The zirconium hydroxide powder material comprises ZrO (OH) 2, the specific surface area is larger than 55.7 m < 2 > / g, and the zirconium hydroxide powder material has high adsorption activity, has a good defluorination effect when applied to defluorination of an aqueous solution and plays a role in reducing the dosage of a defluorination agent. The zirconium hydroxide powder material is good in regeneration effect after defluorination, the regeneration process is simple, and the consumed time is short. The zirconium hydroxide powder is obtained by mixing commercially available zirconium hydroxide with ammonia water, standing and then carrying out heat treatment, and the method is simple, controllable and suitable for industrial production.

The invention belongs to the technical field of novel separation membrane materials, and discloses an ionic covalent organic framework membrane as well as a preparation method and application thereof. An amine monomer and an aldehyde monomer are respectively dissolved in water and an organic solvent, and the continuous defect-free ionic covalent organic framework membrane is formed by in-situ growth on the surface of a carboxylated porous support base membrane through a limited interface polymerization method. And the membrane structure and the separation performance can be optimized by regulating and controlling the monomer concentration and the reaction time. The preparation process is simple, convenient and controllable, the prepared membrane is applied to pervaporation butanol-water separation, high permeability and high selectivity are shown, and good long-term operation stability is achieved. In addition, the prepared membrane can also be applied to separation of other types of alcohol-water and separation of pervaporation salt-water, and has good universality application.

The invention discloses a method for synthesizing functional polyether in a multi-proton system, which comprises the following steps: mixing an epoxy monomer, an amino alcohol / acid compound, organic alkali and alkyl boron for polymerization reaction to obtain carbamate / amide / oligopeptide functional polyether. According to the invention, the hydroxyl is preferentially activated in a multi-proton system by utilizing an acidic reversal phenomenon of an NH type proton group and the hydroxyl in a double-component organic catalytic system, so that a polymerization reaction is only carried out at a hydroxyl / carboxyl terminal; and finally, carbamate / amide / oligopeptide functional polyether with controllable molecular weight and a clear end group structure can be synthesized in a site selective manner through a one-step reaction, and the method is simple, convenient, efficient, controllable and suitable for large-scale industrial application.

The present invention provides a nickel-iron-based oxygen evolution electrode and a preparation method and application thereof, belonging to the field of hydrogen energy technology. The present invention uses a nickel-iron alloy substrate as a working electrode, performs electrochemical surface reconstruction treatment in a mixed solution of molybdate and chloride, and during the electrochemical oxidation process, the nickel-iron alloy substrate dissolves nickel and iron ions, while electrochemical oxidation of chloride ions occurs to form active chlorine, and nickel and iron ions are chemically etched out, and during the electrochemical reduction process, the electrode cathode generates hydroxide, and the nickel and iron ions combine with molybdate and hydroxide to form nickel-iron-molybdenum oxide, and during the next electrochemical oxidation process, the nickel-iron-molybdenum oxide is oxidized to form nickel-iron-molybdenum hydroxide oxide, and part of the molybdenum is dissolved, so as to achieve the regulation of the surface composition, valence state and structure of the nickel-iron alloy substrate, which not only improves the current density, but also improves the stability of the electrode, and the whole process can be carried out at room temperature, and the method is simpler and controllable.

The invention relates to a carbon-coated molybdenum nitride nanoparticle embedded lead-nitrogen co-doped carbon catalyst as well as a preparation method and application thereof. The catalyst is prepared by taking zinc nitrate as a metal salt and 2-methylimidazole as a ligand, firstly preparing a zeolite imidazate metal organic framework material (ZIFs) through coordination self-assembly, then adsorbing a transition metal molybdenum salt and a p-region metal lead salt by utilizing a rich pore structure of the ZIFs, and carrying out high-temperature pyrolysis and acid pickling post-treatment. The catalyst prepared by the method is in a dodecahedron shape, and the diameter of the catalyst is about 137-180nm. Wherein the molybdenum nitride nanoparticles dispersed on the surface of the lead-nitrogen co-doped carbon are coated with a highly graphitized carbon layer, and the thickness of the carbon layer is 1-4 nm. The catalyst can be applied to electrochemical synthesis of ammonia, can effectively catalyze nitrogen reduction reaction and inhibit hydrogen evolution side reaction, and remarkably improves ammonia gas yield and Faraday efficiency of electrochemical synthesis of ammonia.

The present invention provides a Bi- 2 O 3 Dodecahedral cage material and preparation method thereof. The material is a hollow dodecahedral cage structure with a high surface exposure ratio assembled from bismuth oxide amorphous nanodots of about 10 nm in size. The preparation method comprises: dissolving a certain amount of bismuth nitrate and potassium ferrocyanide in an aqueous solution successively to form a clear solution, adding a certain amount of nitric acid to the above solution while stirring, standing for a period of time at room temperature, centrifugally separating and drying to obtain a precursor material after the reaction is completed; taking a certain amount of precursor material and dispersing it in a certain concentration of KOH aqueous solution, centrifugally separating and drying after the reaction is completed. The material has a large surface atomic exposure ratio, highly active nanodot assembly units, fast conductive edges and a porous structure that accelerates the diffusion of substances. It has a novel structure, low cost, green and environmentally friendly, and broad application prospects; its preparation method is green and mild, simple and easy to control, does not require surfactants, and has high production efficiency.

The present invention discloses a quality detection method for a herba purpurogenous grass formula granules, including property detection, extract determination, thin layer identification, characteristic spectrum determination, content determination, and moisture, particle size, filling volume difference, and microbial limit test. Characteristic spectrum determination includes: preparation of four reference substance solutions of neochlorogenic acid, chlorogenic acid, cryptochlorogenic acid, and rutin; preparation of test solution; detection. Determination of the total content of neochlorogenic acid, chlorogenic acid, cryptochlorogenic acid, and rutin includes: preparation of four reference substance solutions of neochlorogenic acid, chlorogenic acid, cryptochlorogenic acid, and rutin; preparation of test solution; detection. Determination of the total content of kaempferol and quercetin includes: preparation of two reference substance solutions of quercetin and kaempferol; preparation of test solution; detection. The method of the present invention has the characteristics of high accuracy, high precision, stability, good reproducibility, good specificity, etc., and realizes the effective control of the quality of the herba purpurogenous grass formula granules.

The application relates to the field of sodium ion batteries, and discloses a preparation method of hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires and application thereof. The application takes NTA as a metal ion chelating agent, chelates zinc ions and iron ions through a solvothermal reaction, and prepares a ZnFe-NTA precursor; the precursor is pyrolyzed at high temperature under an inert atmosphere, metal ion reduction is induced through a carbon thermal reaction, low-boiling-point zinc particles are volatilized, nitrogen-doped carbon formed through in-situ conversion of an organic ligand is combined, and a hierarchical porous structure is generated; finally, a gas-phase sulfuration method is adopted to form Fe7S8, and the hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires are obtained. When the composite nanowires are used as a negative electrode of a sodium ion battery, the hierarchical porous structure can effectively promote full infiltration of electrolyte and rapid migration of sodium ions, and can improve cycle stability and rate performance.

The invention discloses a BiFeO3 film with nested skyrmions and a preparation method and application thereof, and relates to the technical field of nested skyrmions materials. The preparation method of the BiFeO3 film with nested skyrmions comprises the steps of: 1.03 FeO3 was used as the target material, and pulsed laser deposition was used on (LaAlO3) oriented in [001] direction. 0.29 (SrTa 1 / 2Al 1 / 2 O3) 0.71 Deposition is performed on a substrate to obtain a BiFeO3 film with nested skyrmions; the process parameters used are: temperature of 750-820°C, oxygen pressure of 70-90mTorr, laser energy of 300-370mJ, deposition rate of 8-10Hz, and deposition time of 5-32min. The present invention adopts a simple and controllable pulsed laser deposition method and a rapid deposition strategy to prepare a BiFeO3 film with nested skyrmions.