2671 results about "Dimethylformamide" patented technology

The invention provides a temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for a soil-phase-free water-based drilling fluid as well as a preparation method and application of the temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer, and belongs to the technical field of drilling. The temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for the soilless phase water-based drilling fluid comprises the following raw materials in parts by weight: N, N-dimethylformamide, a cross-linking agent and a cross-linking agent, the invention relates to a water-based adhesive which is prepared from the following components in parts by weight: 15 to 25 parts of N, N-dimethylacrylamide, 1 to 10 parts of 3-[(3-methacrylamidopropyl) dimethylammonium] propane-1-sulfonate, 1 to 10 parts of long-chain alkyl polyoxyethylene ether methacrylate, 0.005 to 0.015 part of macromolecular cross-linking agent, 0.03 to 0.08 part of initiator A and 80 to 100 parts of deionized water. The tackifying filtrate reducer can resist the temperature of 180 DEG C, can resist NaCl to be saturated, has excellent tackifying, shear-improving and filtrate-reducing effects under high-temperature and high-salt conditions, improves the rheological property and the filtrate-reducing property of drilling fluid, and ensures safe and efficient drilling of a deep well.

The invention discloses a preparation method of a degradable transparent conductive polymer film, and belongs to the technical field of film preparation. Preparing dispersion liquid I through graphene oxide quantum dots; preparing a dispersion liquid II from polyaniline nanofibers; dissolving pyrrole and toluenesulfonic acid in N, N-dimethylformamide to prepare a reaction solution, adding the dispersion liquid I and the dispersion liquid II, stirring, and adding ferric chloride hexahydrate to obtain a reaction solution; adjusting the pH value of the reaction solution to 1.5, and heating to obtain a polypyrrole solution; preparing cellulose acetate, polyvinyl alcohol and N, N-dimethylformamide to obtain a cellulose acetate solution; mixing the polypyrrole solution and the cellulose acetate solution, adding glutaraldehyde to obtain a mixed solution, and pouring the mixed solution into a mold to prepare a composite wet film; and putting the composite wet film into a hot-pressing forming machine for hot-pressing to generate the polymer film. The conductive polymer film prepared by the invention can be applied to the fields of supercapacitor electrode materials, electromagnetic shielding materials, flexible sensors and the like, and provides a new high-performance material choice for the development of related fields.

The invention discloses a copper-based nano-enzyme, a preparation method thereof and application of the copper-based nano-enzyme in organophosphorus pesticide detection, and belongs to the technical field of pesticide residue detection. The copper-based nano-enzyme has a netted-like structure, a high specific surface area and many active sites, the valence state of a copper element is zero-valence Cu, Cu < + > and Cu < 2 + >, the copper-based nano-enzyme has high peroxidase-like activity and laccase-like activity, the detection limit is low, and glyphosate can be sensitively detected; and glyphosate, glufosinate-ammonium and isazofos can be well distinguished from six organophosphorus pesticides with medium concentration, and the method has high selectivity. The nano enzyme provided by the invention is prepared from ammonium citrate and copper nitrate in an N, N-dimethylformamide (DMF) solution by using a solvothermal method; the preparation process of the nano enzyme is simple.

The invention provides a SiO2 / TiO2 / PMMA radiation refrigeration film and a preparation method thereof, and relates to the technical field of passive daytime radiation refrigeration films. The radiation refrigeration film is prepared from the following raw materials: N, N-dimethylformamide, polymethyl methacrylate, silicon dioxide and titanium dioxide. The invention relates to a preparation method of a SiO2 / TiO2 / PMMA radiation refrigeration film. The preparation method comprises the steps of preparing silicon dioxide, preparing titanium dioxide, synthesizing composite sol and preparing the SiO2 / TiO2 / PMMA radiation refrigeration film. The SiO2 / TiO2 / PMMA radiation refrigeration film prepared by the invention has high reflectivity in the ultraviolet-visible-near infrared band and high emissivity in the infrared band, can realize 8.4 DEG C sub-environment refrigeration, and is low in cost and simple in process flow.

The invention discloses a preparation method of a rapidly-formed Janus structure stretchable electrode, an electrode material system is a material system composed of thermoplastic polyurethane (TPU), liquid metal particles and N, N-dimethylformamide (DMF), and electrode forming comprises two self-assembly processes. In the first self-assembly process, the liquid metal particles rapidly settle to form a Janus structure under the action of gravity; and a second self-assembly process: quickly dissolving DMF in water under the action of phase separation, and quickly separating out TPU to form a porous structure. The whole electrode forming process is about 15 seconds, which is the fastest stretchable electrode film forming process so far. The electrode has high conductivity, high stretchability and insensitivity to tensile strain, the electrode can spontaneously form a Janus structure with one conductive side and the other insulated side so as to achieve a self-protection structure for the whole electrode, and the electrode is expected to be applied to the flexible electronic fields of electronic skin, human body information detection, stretchable electronic devices and the like.

The method comprises the following steps: (1) putting 1-vinyl imidazole into a flask containing N, N-dimethylformamide and D314 type resin, adding an initiator, carrying out a grafting reaction under the action of the initiator, and obtaining imidazolyl anion exchange resin after the reaction is finished; (2) pre-treating the imidazolyl anion exchange resin, and then adsorbing a rhenium-containing solution to be treated by adopting the pre-treated imidazolyl anion exchange resin; and (3) washing the imidazolyl anion exchange resin subjected to saturated adsorption in the step (2) by using ultrapure water, and then analyzing by using ammonia water to obtain a high-purity rhenium-containing solution. According to the method, the imidazolyl anion exchange resin is synthesized, the imidazolyl anion exchange resin has excellent selective adsorption capacity on rhenate ions, and efficient separation of rhenium and other impurities can be achieved when the imidazolyl anion exchange resin is applied to the rhenium-containing solution.

The invention discloses a synthesis method and application of a Cu / Ni and Cu / Zn bimetallic conductive MOF-based catalyst for enhancing reduction of nitrate into ammonia, and relates to MOF catalyst preparation, and the synthesis method is characterized by comprising the following steps: S1, dissolving cupric acetate monohydrate and nickel acetate tetrahydrate or zinc acetate dihydrate in ultrapure water to prepare a solution A; s2, dissolving 2, 3, 6, 7, 10, 11-hexahydroxy tribenzene and ammonia water into N, N-dimethylformamide (DMF), so as to obtain a solution B; s3, mixing the solution A and the solution B, and performing ultrasonic treatment for 10-30 minutes to prepare a solution C; and S4, heating the solution C in an isothermal oven at 85 DEG C for 1-3 hours, naturally cooling to room temperature, respectively washing with deionized water and acetone for 6 times, and finally drying in a vacuum oven at 60 DEG C to obtain a dark blue crystal. The Cu / Zn and Cu / Ni bimetallic conductive MOF prepared by the method has high specific surface area, and the prepared electrode has high responsivity to nitrate ions, has a remarkable nitrate removal effect, has high removal efficiency and has high ammonia selectivity.

The invention relates to the field of air filtration, in particular to a method for rapidly preparing ZIF-8 / polypropylene melt-blown cloth fiber membranes in batches at low cost. Aiming at the problems of high cost, long preparation time, complex process and the like of the existing method for growing ZIF-8 on the surface of polypropylene melt-blown cloth to improve the air filtering performance, the invention provides a method for rapidly preparing ZIF-8 / polypropylene melt-blown fiber membranes in batches at low cost. The preparation method comprises the following steps: firstly, pretreating the surface of polypropylene melt-blown cloth by using an inorganic aqueous alkali solution, then sequentially putting the melt-blown cloth into a zinc ion aqueous solution and a 2-methylimidazole / N, N-dimethylformamide mixed aqueous solution under an ultrasonic condition, and drying to prepare the ZIF-8 / polypropylene melt-blown fiber membrane. According to the preparation method, water is taken as a main solvent, and a small amount of N, N-dimethylformamide is added into the water, so that rapid growth on polypropylene melt-blown cloth at a small molar ratio of 2-methylimidazole to zinc nitrate hexahydrate is realized, and the preparation method is suitable for large-scale industrial production for air filtration.

The invention relates to the field of sponge materials, and provides an antibacterial degradable sponge material and a preparation method thereof. The material is prepared from protocatechuic acid modified quaternized chitosan, quaternary ammonium salt grafted gelatin, sodium alginate, polyhydroxybutyrate, polycaprolactone, a polylactic acid-glycolic acid copolymer, hexamethylene diisocyanate, a foaming agent, nano cellulose, vitamin E, polyethylene glycol, triethylamine and dimethylformamide. Protocatechuic acid and quaternized chitosan are subjected to amidation modification, and chitosan and gelatin are subjected to quaternization treatment by adopting 2, 3-epoxypropyl trimethyl ammonium chloride, so that the antibacterial property and biodegradability of the material are improved. In the material preparation process, through vacuum degassing, foaming vacuum degree and humidity control and a multi-step drying process, it is ensured that the average pore size of the material is uniform (50-200 microns) and the porosity is high (50%-90%), and the obtained material has excellent antibacterial property and degradability and has wide application value.

The invention discloses a sunlight response high-strength self-repairing polyurethane material and a preparation method thereof, and belongs to the technical field of self-repairing materials, the sunlight response high-strength self-repairing polyurethane material is obtained by coordinating polyurethane containing an azothiazole structure and metal ions according to a certain proportion, the polyurethane containing the azothiazole structure is prepared by stirring diisocyanate, diol containing the azothiazole structure, long-chain diol and aminophenylboronic acid according to a certain proportion in N, N-dimethylformamide at room temperature to react for 5 hours. According to the invention, a photoactive azothiazole structure is introduced into polyurethane, and reversible metal coordination bonds are formed by the azothiazole structure and metal ions, so that rapid sunlight response self-repairing of the polyurethane material is realized. The self-repairing efficiency of the prepared photoresponse self-repairing polyurethane material is 95.1% after the photoresponse self-repairing polyurethane material is irradiated by sunlight for 2 h, and the photoresponse self-repairing polyurethane material has rapid photoresponse self-repairing performance and has wide application prospects in the fields of self-repairing coatings, intelligent coatings and anti-corrosion coatings.

The invention discloses an asphalt-based hard carbon negative electrode material for a sodium-ion battery and a preparation method of the asphalt-based hard carbon negative electrode material, and belongs to the technical field of negative electrode materials for sodium-ion batteries. The hard carbon negative electrode material is prepared from the following raw materials in parts by weight: 30-80 parts of asphalt, 10-30 parts of a cross-linking agent and N, N-dimethylformamide as a solvent. The preparation method comprises the following steps: S1, carrying out crushing, ball milling and sieving on the asphalt to obtain powder with the particle size of 10 [mu] m; s2, uniformly mixing the powder, N, N-dimethylformamide and a cross-linking agent to obtain a cross-linked substance; s3, carrying out pre-oxidation treatment on the cross-linked product in an oxygen atmosphere; and S4, performing high-temperature carbonization treatment on the low-temperature pre-oxidized cross-linked product in an inert atmosphere to obtain the asphalt-based hard carbon material. The organic cross-linking agent is introduced to initiate oxidation cross-linking of the asphalt, so that the asphalt is converted into a thermosetting precursor from a thermoplastic precursor, and the high-performance asphalt-based hard carbon material for the sodium-ion battery is prepared.

The invention discloses a shielding protection adhesive tape for semiconductor integrated circuit packaging and a preparation method thereof, and relates to the technical field of semiconductor integrated circuit packaging. The shielding protective adhesive tape for packaging the semiconductor integrated circuit is prepared by taking polyimide as a base material and coating a coating, and the coating comprises the following raw materials in parts by weight: 3-5 parts of modified nano silicon dioxide, 30-40 parts of N, N-dimethylformamide, 1-3 parts of a curing agent and 1-3 parts of a curing agent. The invention discloses a high-temperature-resistant epoxy resin coating which is prepared from the following components in parts by weight: 25-30 parts of N, N-dimethylformamide, 25-30 parts of a modified acrylate copolymer, 17-26 parts of ethyl acetate, 12-15 parts of epoxy resin, 1-2 parts of a silane coupling agent KH-550, 0.5-1 part of an antioxidant 1010, 0.3-0.8 part of an ultraviolet absorbent UV-327, 1-2 parts of carboxyl-terminated nitrile rubber, 2-4 parts of decabromodiphenyl ether, 0.1-0.3 part of an organic siloxane defoaming agent, 0.2-0.5 part of an acrylate flatting agent and 10-11 parts of diaminodiphenyl sulfone. The adhesive tape contains the modified nano silicon dioxide, the modified acrylate copolymer and other components, so that the performance of the adhesive tape is guaranteed; pretreatment is meticulous, preparation steps are standard, and mass production is easy; a finished product can be effectively shielded, and the packaging yield and the product stability can be improved.

The invention relates to the technical field of dispersing agents for ceramics, and discloses a preparation method of a dispersing agent for ceramics, and the novel dispersing agent for ceramics is prepared by taking methoxypolyethylene glycol, bromoacetyl bromide, 4-hydroxyphthalic anhydride, 2, 4, 6-diethanolamine amino-1, 3, 5-s-triazine and the like as raw materials. The polyether polyol contains a plurality of carboxyl groups, has strong interaction with the surface of ceramic powder such as aluminum oxide, has a star-shaped multi-arm polyether molecular chain, can well coat the aluminum oxide powder, can effectively inhibit the growth of crystal nucleus particle size of the aluminum oxide powder, reduces the particle size of the aluminum oxide, and avoids agglomeration and sedimentation of the aluminum oxide; the modified aluminum oxide ceramic powder has good activation degree in solvents such as water, ethanol, dichloromethane or N, N-dimethylformamide and the like, is lower in settling volume and shows excellent dispersing performance.

The present application discloses an acetylated glucomannan electrospun membrane, and a preparation method therefor and a use thereof. The preparation method for an electrospun membrane of the present application comprises: first adding glucomannan into a mixed solution of pyridine and acid anhydride, carrying out solid-liquid separation after the reaction, collecting a solid phase, adding ethanol for precipitation, and collecting the precipitate to obtain acetylated glucomannan; then dissolving the acetylated glucomannan in a mixed solution of chloroform and N,N-dimethylformamide, and carrying out ultrasonic treatment to obtain an electrospinning solution; and finally, using the electrospinning solution as a raw material, and carrying out electrospinning to obtain an acetylated glucomannan electrospun membrane.

The invention discloses a phase change fiber membrane with a composite core-sheath structure and a preparation method and application thereof.The method comprises the steps that polyacrylonitrile is dissolved in N 'N-dimethylformamide and stirred to be completely dissolved, then hydroxylated boron nitride is added, the hydroxylated boron nitride is evenly dispersed through ultrasonic treatment, and a sheath spinning precursor solution is prepared; dissolving polyethylene glycol in N 'N-dimethylformamide, stirring to melt the polyethylene glycol, and taking the polyethylene glycol as a core layer spinning precursor solution; preparing a phase change fiber membrane with a core-sheath structure from the sheath spinning precursor solution and the core spinning precursor solution through a coaxial electrostatic spinning process; and placing the phase change fiber membrane with the core-sheath structure in an ethanol dispersion liquid of hydroxylated boron nitride, carrying out ultrasonic dip-coating, and then carrying out cold pressing treatment to prepare the phase change fiber membrane with the composite core-sheath structure. The obtained composite core-sheath structure phase change fiber membrane has good latent heat property, thermal conductivity and flexibility, and meanwhile, leakage of the phase change material is prevented through the core-sheath structure.

The invention discloses preparation of a bionic copper-based MOF nano-enzyme and application of the bionic copper-based MOF nano-enzyme in hydroquinone detection, and the bionic copper-based MOF nano-enzyme is prepared by the following method: dissolving terephthalic acid H2BDC and L-histidine His in N, N-dimethylformamide DMF to obtain a solution A; adding copper chloride CuCl2. 2H2O into the solution A obtained by C1, and stirring to form a uniform mixed solution; carrying out hydrothermal reaction on the mixed solution obtained from C2 for a certain time, centrifuging to obtain a solid precipitate, cleaning the solid precipitate, and drying to obtain the bionic Cu / His-MOF nano-enzyme; the invention also discloses an application of the sensor in hydroquinone detection. The bionic copper-based MOF nano-enzyme has the advantages of being simple and convenient to synthesize, high in substrate affinity, high in catalytic capacity and the like, and meanwhile, a rapid, sensitive and reliable HQ detection method is provided.

The invention discloses a nickel-iron-based bimetallic organic framework catalyst and a preparation method thereof, and belongs to the field of electrochemical catalyst preparation, the preparation method comprises the following steps: step 1, dissolving a metal nickel salt in pure water, and carrying out ultrasonic dispersion to obtain a solution A; the preparation method comprises the following steps: dissolving a ferrocene dicarboxylic acid ligand in N, N-dimethylformamide to obtain a solution B; ultrasonically stirring and uniformly dispersing the solution A and the solution B to obtain a mixed solution; and 2, synthesizing the nickel-iron-based bimetallic organic framework catalyst from the mixed solution by using a hydrothermal method. The nickel-iron-based bimetal organic framework catalyst prepared by the preparation method disclosed by the invention shows good OER catalytic performance in an alkaline medium.

The invention discloses a zinc-bromine flow battery multifunctional negative electrode electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: uniformly stirring and mixing a solvent, deionized water and a cosolvent, adding an electrolyte, stirring until the electrolyte is completely dissolved, then adding a supporting electrolyte and a negative electrode additive, stirring until the supporting electrolyte and the negative electrode additive are completely dissolved, and obtaining the zinc-bromine flow battery multifunctional negative electrode electrolyte. The multifunctional negative electrode electrolyte of the zinc-bromine flow battery is obtained; the negative electrode cosolvent is dimethylformamide; and the negative electrode additive is at least one of saponin and cinnamyl aldehyde. Saponin molecules are adsorbed on the surface of the zinc electrode, and electronegative carboxyl groups of the saponin molecules form an electrostatic repulsion net in an electric double layer, so that zinc ions are forced to be uniformly dispersed, local ion concentration hot spots are eliminated, and dendritic crystal nucleation is inhibited from the source. In cinnamyl aldehyde, the strong electronegativity of oxygen atoms and the electronegativity of aldehyde oxygen are far higher than those of hydrogen, so that electrons are strongly attracted, adjacent carbon atoms are positively charged, polar adsorption sites are formed, the hydrogen evolution reaction is effectively inhibited, and the stability and the cycle life of the battery are greatly improved.

The invention relates to a halogen-free flame-retardant TPU composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The halogen-free flame-retardant TPU composite material is prepared from the following components in parts by weight: 3 to 10 parts of a modified flame retardant, 2 to 10 parts of phenoxy cyclophosphazene, 80 to 100 parts of TPU particles, 90 parts of N, N-dimethylformamide, 0.8 to 1.2 parts of an ultraviolet light absorber and 2.5 to 3.5 parts of a lubricating agent, in the modified flame retardant, ammonium polyphosphate is heated into polyphosphoric acid, heat insulation and flame retardance are achieved, the comprehensive performance of the material is improved, and a quaternized structure and a carbamate bond synergistically enhance the flame retardance and heat resistance of the material; in the ultraviolet light absorber, cyanuric chloride and benzotriazole intermediates absorb ultraviolet rays, so that the damage of the ultraviolet rays to the material is reduced, and the ageing resistance and the toughness are enhanced; the halogen-free flame-retardant TPU composite material prepared by the invention not only has good flame-retardant and heat-resistant effects, but also has excellent ultraviolet resistance.

The invention relates to the field of textile fabrics, and particularly discloses an antibacterial and crease-resistant garment fabric and a preparation process thereof. The antibacterial and crease-resistant garment fabric is prepared from modified cotton fibers and electrospun fibers of polyacrylonitrile and polyurethane according to the mass ratio of 1: (0.1-0.3): (0.3-0.5), and a preparation method of the polylactic acid fiber modified cotton fibers containing silver nanowires comprises the following steps that the cotton fibers are padded in finishing liquid and then dried and shaped, and pretreated cotton fibers are prepared; the pretreated cotton fibers are padded in the treating fluid and then dried and baked, and modified cotton fibers are prepared; the finishing liquid is prepared from the following raw materials: citric acid modified titanium dioxide sol, sodium hypophosphite, triethanolamine and deionized water; the treating fluid is prepared from the following raw materials: nylon waste silk, chitosan quaternary ammonium salt, N, N-dimethylformamide and alkaline silica sol. The garment fabric has the advantages of being good in antibacterial and crease-resistant effect, lasting in antibacterial effect and high in breaking strength.

The invention discloses a fluoride-free waterproof sound-transmitting film and a preparation method thereof, and the fluoride-free waterproof sound-transmitting film comprises the following components in percentage by mass: 30-40% of a fluoride-free polymer; 4.5%-11.5% of a fluoride-free waterproof agent; 0.5%-3.5% of a cross-linking agent and 45%-65% of a solvent; the solvent is a mixed solvent of N 'N-dimethylformamide, N' N-dimethylacetamide, acetone and ethyl acetate, and the mass ratio of the amide solvent in the mixed solvent is 60%-85%; the preparation method of the fluoride-free waterproof sound-transmitting film comprises the following steps: preparing a spinning solution; carrying out electrostatic spinning by utilizing electrostatic spinning equipment to obtain a continuous and uniform nano spinning membrane; the method comprises the following steps: uniformly depositing nanofibers on a nano spinning film base material, and carrying out post-treatment to obtain a finished product of the fluoride-free waterproof sound-transmitting film, the fluorine-free safe and healthy product with good water resistance and air permeability, high rebound resilience and excellent acoustic performance is successfully prepared through selection of raw materials, preparation of a spinning solution, spinning process parameters and fine regulation and control of post-treatment conditions.

The invention provides a non-noble metal heterogeneous catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. The non-noble metal heterogeneous catalyst provided by the invention comprises an indium-zinc bimetallic oxide and an aluminum element doped in the indium-zinc bimetallic oxide. The non-noble metal heterogeneous catalyst (InZnAlOx catalyst) provided by the invention shows excellent catalytic activity and catalytic stability in preparation of N, N-dimethylformamide by reaction of carbon dioxide, hydrogen and dimethylamine. The result of the embodiment shows that compared with an InZnOx catalyst, when the InZnAlOx catalyst provided by the invention is used for preparing N, N-dimethylformamide through reaction of carbon dioxide, hydrogen and dimethylamine, the yield of N, N-dimethylformamide is high, and the InZnAlOx catalyst has excellent stability.

The invention relates to the technical field of petroleum drilling fluids, in particular to a lubricant additive and a preparation method thereof, a lubricant, a water-based drilling fluid and a preparation method thereof, the lubricant additive comprises the following raw materials: 6 parts of taurine, 30-60 parts of 1-bromohexadecane, 8.5-15 parts of potassium hydroxide, 0.5-0.9 part of potassium iodide, 30-60 parts of thionyl chloride, 2-4 parts of N, N-dimethylformamide, 7-17 parts of ammonia water and 30 parts of trichloromethane. The lubricant additive takes sulfonic acid amine as an active adsorption group, and can be stably adsorbed on a drill stem, a sleeve and a mud cake. Meanwhile, two C16 flexible chains are arranged, a compact lubricating film can be formed, and friction resistance is efficiently reduced.

The invention discloses a perovskite active layer film, a preparation method thereof and a perovskite solar cell, and belongs to the field of photovoltaic technology. The preparation method of the perovskite active layer film comprises the following steps: S1, mixing a perovskite active material and a solvent to obtain a perovskite precursor solution; the solvent comprises a first solvent which is a mixed solvent of N-methyl-2-pyrrolidone, dimethyl sulfoxide and N, N-dimethylformamide, and the first solvent, the dimethyl sulfoxide and the N, N-dimethylformamide are sequentially mixed according to the volume ratio of (1-10): (1-8): 100; and S2, coating the perovskite precursor solution on the surface of a substrate, carrying out vacuum flash evaporation, and then carrying out heating treatment to obtain the perovskite active layer film. The DMSO solvent in a specific proportion is introduced into the precursor solvent, and the proportion of the three solvents is controlled, so that growth of crystal grains in the perovskite active layer thin film can be obviously promoted, the perovskite crystal grain size and the crystal grain quality are improved, and the photoelectric conversion efficiency of the perovskite solar cell is further improved.

The invention provides a zirconium boride / graphene complex-phase wear-resistant and high-temperature-resistant ceramic material and a preparation method thereof, and belongs to the technical field of ceramics. The preparation method comprises the following steps: pretreating graphene, preparing titanium dioxide / graphene microspheres, modifying the titanium dioxide / graphene microspheres, functionalizing the titanium dioxide / graphene microspheres, preparing a ceramic mixture, molding and sintering. The step of functionalizing the titanium dioxide / graphene microspheres comprises the following steps: putting the modified titanium dioxide / graphene microspheres into xylene, adding bisphenol A epoxy resin and triphenylphosphine, raising the temperature, carrying out stirring reaction, filtering out, washing, putting into N, N-dimethylformamide, uniformly stirring, adding gallic acid and p-toluenesulfonic acid, and carrying out ultrasonic treatment to obtain the titanium dioxide / graphene microspheres. Raising the temperature for reaction, filtering, washing and drying after the reaction is finished, so as to prepare functionalized titanium dioxide / graphene microspheres; the prepared ceramic material is high in strength, good in wear resistance and excellent in high temperature resistance.

The invention belongs to the field of preparation of medical intermediates, and particularly relates to a preparation method of an On-DNA sulfinic acid structure compound. The method for preparing the On-DNA sulfinic acid structure compound comprises a step of oxidizing On-DNA thiol (phenol) into the On-DNA sulfinic acid structure compound under alkaline and heating or illumination conditions, a solvent used in the reaction step is a mixed solution of water, dimethyl sulfoxide, N, N-dimethylformamide, acetonitrile, ethanol or tetrahydrofuran, the reaction temperature is not more than 80 DEG C, and the reaction time is not more than 2 hours. And the illumination wavelength ranges from 365 nanometers to 535 nanometers. The On-DNA sulfinic acid structure compound obtained in the invention can be directly used for constructing a structure compound with a sulfonyl group, the reaction condition is mild and convenient, a new method and a new idea are provided for construction of a DNA coding compound library, and the On-DNA sulfinic acid structure compound has a very good application prospect in lead drug development.

The invention discloses a method for preparing dimethyl carbonate through reaction of CO and methyl nitrite, belongs to the technical field of preparation of dimethyl carbonate, and aims to solve the problem that in the prior art, in the process of preparing dimethyl carbonate through catalysis of reaction of CO and methyl nitrite, the reaction time is short. The preparation method specifically comprises the following steps: in an inert gas atmosphere, mixing and stirring isocyanatopropyltriethoxysilane and N, N-dimethylformamide, raising the temperature of a reaction system to 50-60 DEG C, carrying out a reaction for 1-2 hours, and carrying out a reaction for 1-2 hours, so as to obtain a reaction solution; and 3-aminopropionic acid is added into the reaction system. According to the method, silicon-aluminum coating, potassium modification and 18-crown-6-ether modification are sequentially performed after a halogen-free palladium-copper catalytic system is prepared, so that the conversion rate of impurities and the chromatic value of a product are reduced, the conversion rate of methyl nitrite is effectively increased, and the service life of the catalyst is effectively prolonged.

The invention relates to the technical field of hydraulic fracturing exploitation of deep / ultra-deep oil and gas reservoirs, and discloses a gel-coated temporary plugging agent and a preparation method and application thereof.The gel-coated temporary plugging agent comprises a proppant inner core and a degradable gel shell coating the outer surface of the proppant inner core; the degradable gel shell is formed by a gel shell gelling solution, the gel shell gelling solution comprises small-molecule comonomers and a degradable cross-linking agent, and the small-molecule comonomers comprise acrylamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide the initiator is one or more of N, N-dimethylacrylamide, acrylic acid, hydroxyethyl acrylate, benzyl acrylate, 2-propyl acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and N-vinyl pyrrolidone; and the initiator is one or more of N, N-dimethylacrylamide, acrylic acid, hydroxyethyl acrylate, benzyl acrylate, 2-propyl acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and N-vinyl pyrrolidone. The gel-coated temporary plugging agent can be used for effectively plugging in a fracturing time period at high temperature / ultrahigh temperature, and the flow conductivity of fractured cracks can be enhanced by exposing an internal propping agent after the gel-coated temporary plugging agent is degraded.

The invention discloses a flame-retardant polyoxyethylene composite solid electrolyte and a preparation process thereof, and relates to the technical field of solid electrolytes. Comprising the following steps: 1, mixing and stirring modified polyacrylonitrile, polyacrylonitrile and N, N-dimethylformamide, and putting the mixture into an electrostatic spinning machine to obtain a polyacrylonitrile fiber membrane; 2, mixing and stirring the modified beta-cyclodextrin, acetonitrile, polyoxyethylene, lithium perchlorate and succinonitrile to obtain a mixed solution; and 3, putting the polyacrylonitrile fiber membrane into a polytetrafluoroethylene mold, dropwise adding the mixed solution, and drying and demolding at 40 DEG C to obtain the composite solid electrolyte. The composite solid electrolyte has the beneficial effects that beta-cyclodextrin and polyacrylonitrile are modified, so that the compatibility of beta-cyclodextrin and polyacrylonitrile with a polymer matrix is improved, and the ionic conductivity and tensile strength of the composite solid electrolyte are improved. Meanwhile, the grafted spirocyclic phosphate group enables the overall flame retardance of the composite solid electrolyte to be improved to a certain extent.

The invention relates to the field of new energy storage materials, and discloses a multifunctional composite perfluorosulfonic acid ion exchange membrane for an all-vanadium redox flow battery, and the composite membrane comprises the following components: perfluorosulfonic acid resin which accounts for 60-90wt% of the total mass of the membrane and is used as a matrix material; the functionalized multi-walled carbon nanotube accounts for 5-15 wt.% of the total mass of the membrane, and carboxyl and hydroxyl are introduced through surface treatment; phosphotungstic acid accounts for 5-20wt.% of the total mass of the membrane, and is anchored on the surface of the functionalized multi-walled carbon nanotube through an electrostatic spinning process; n, N-dimethylformamide and isopropanol are used as solvents, and the solvents are mixed with a perfluorinated sulfonic acid resin solution according to the volume ratio of 1: 1. The proton conductivity, the vanadium ion barrier property and the tensile strength of the composite membrane are obviously superior to those of a traditional Nafion membrane. According to the technical scheme, an efficient and economical solution is provided for improving the overall performance of the all-vanadium redox flow battery, and the method has good application prospects and market value.