38 results about "N dimethylformamide" patented technology

The invention discloses a CeO2-MnOx superfine nanofiber catalyst as well as an electrostatic spinning preparation method and application thereof, and belongs to the technical field of material preparation and environmental protection. N-N dimethylformamide (DMF) is adopted as a solvent, cerium nitrate hexahydrate and manganese acetate tetrahydrate are adopted as precursor salts, polyvinylpyrrolidone (PVP) is adopted as a flocculating agent, a gelatinous precursor solution is formed, jet stretching is performed under the high-voltage electrostatic effect, a nanofiber membrane is obtained at the collecting end, and after drying, the CeO2-MnOx superfine nanofiber is obtained through calcination of a stepped heating program. The diameter of the catalyst is 300-400 nm, the catalyst has good oxidation reduction capacity, by means of the efficient electron transfer capacity of the nanofiber morphology and the confinement effect of a fiber cavity, the catalyst shows excellent ultralow-temperature denitration activity and sulfur resistance, denitration reaction is carried out within the temperature range of 75-225 DEG C, the NO conversion rate can be 95% or above, and the catalyst has the advantages of being low in cost and high in efficiency. The catalyst can be applied to the field of flue gas ammonia selective catalytic denitration in non-power industry, and has a good industrial application prospect.

The invention discloses lithium-free high-heat-resistance ceramic pug and a preparation method thereof, and relates to the technical field of ceramic materials. When the lithium-free high-heat-resistance ceramic pug is prepared, aluminum oxide reacts with 3-(2, 3-epoxypropoxy) propyltrimethoxysilane to prepare pre-modified aluminum oxide; reacting the pre-modified aluminum oxide with starch to obtain modified aluminum oxide; mixing ethyl acetoacetate, isopropanol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide to prepare a spinning solution, performing electrostatic spinning, and then immersing the spinning solution into the yttrium oxide sol to prepare aluminum oxide-zirconium oxide-yttrium oxide composite fibers; stirring and mixing the modified aluminum oxide, talc, aluminum oxide-zirconium oxide-yttrium oxide fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water, and performing vacuum pugging to obtain the lithium-free high-heat-resistance ceramic pug. The lithium-free high-heat-resistance ceramic pug prepared by the invention has good thermal shock resistance and bending strength after being sintered.

A high-entropy nano-array for electrocatalytic nitrate reduction coupling waste plastic conversion is prepared by the following method: (1) immerse the nickel foam into a hydrochloric acid solution to remove the surface oxide layer and oil stains, rinse with deionized water / ethanol three times, and dry for subsequent use; (2) solid powders of sodium chloropalladate, platinum acetylacetate, nickel chloride hexahydrate, copper chloride dihydrate, silver trifluoroacetate and tungsten hexacarbonyl are poured into an N-N dimethylformamide solution, ultrasonic is used to dissolve the solid powders, then glacial acetic acid and the treated nickel foam are added to the above solution, and after ultrasonic, heating in an oven is carried out, after the reaction is completed, water and ethanol solution are used for alternate washing, and drying is carried out, and the high-entropy nano-array catalyst is obtained. A preparation method of a high-entropy nano-array for electrocatalytic nitrate reduction coupling waste plastic conversion is provided. The high-entropy nano-array has excellent electrocatalytic activity and stability.

The application discloses a lithium-free high-heat-resistant ceramic mud and a preparation method thereof, and relates to the technical field of ceramic materials. In the preparation of the lithium-free high-heat-resistant ceramic mud, alumina is reacted with 3-(2,3-epoxypropoxy) propyl trimethoxysilane to obtain pre-modified alumina; the pre-modified alumina is reacted with starch to obtain modified alumina; ethyl acetoacetate, isopropyl alcohol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide are mixed to form a spinning solution, the spinning solution is electrospun, and then immersed in yttrium oxide sol to obtain alumina-zirconia-yttria composite fibers; the modified alumina, talc, alumina-zirconia-yttria fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water are stirred and mixed, and vacuum pugging is carried out to obtain the lithium-free high-heat-resistant ceramic mud. The lithium-free high-heat-resistant ceramic mud prepared by the application has good thermal shock resistance and bending strength after sintering.

The application discloses a kind of methods for synthesizing MOFs / cellulose aerogel composite electrode material and its electrocatalytic oxygen evolution application, belong to electrocatalytic functional material preparation process technical field.It is specifically disclosed a kind of preparation method of Cr-NiFe MOF / cellulose aerogel electrode material, including the following steps, Cr source, Ni source and Fe source are dissolved in deionized water and are added to the solution of N,N dimethylformamide containing terephthalic acid, after stirring uniformly, transfer to Teflon reaction kettle, 160 DEG C is reacted 24h and obtains Cr-NiFe MOF;Subsequently, the obtained Cr-NiFe MOF powder is dispersed in carboxymethyl cellulose solution, a certain amount of acetone is added, after mixing uniformly at 80 DEG C, liquid nitrogen freezing is carried out, then 48h of freeze drying can be obtained Cr-NiFe MOF / cellulose aerogel composite material.This composite electrode material when used as electrocatalytic oxygen evolution material, show superior activity and extremely high stability.Especially, at 10mA·cm-2, show 235mV of low overpotential, tafel slope is 53.7mV·dec-1, stability is more than 210h, is one of the best aerogel composite materials of catalytic performance at present, has good application prospect in catalysis and energy conversion field.

The invention relates to the field of electrocatalysts, in particular to a Ru t-ZrO2 / C electrocatalyst and a preparation method thereof.The preparation method includes the steps that zirconium tetrachloride, terephthalic acid, N, N-dimethylformamide and formic acid are put into a polytetrafluoroethylene lining to be subjected to a solvothermal reaction, and after the temperature is cooled to the room temperature, centrifugal washing and vacuum drying are conducted through DMF and methyl alcohol to obtain UiO-66 powder; secondly, dispersing the UiO-66 powder in methanol, adding ruthenium trichloride, stirring, centrifugally washing with methanol, and drying in vacuum to obtain a precursor Ru-UiO-66; and finally, sintering the precursor Ru (at) UiO-66 in a tubular furnace under an argon condition to obtain the Ru (at) t-ZrO2 / C electrocatalyst. According to the present invention, the strong interaction between the Zr-Ru bimetallic sites is combined with the strong conductive structure formed by ZrO2 and the carbon substrate, such that the prepared electrocatalyst has characteristics of low loading amount of the noble metal Ru cluster, excellent structure stability, high active site utilization rate, and efficient electron transfer with the MOFs carrier so as to show the efficient acid-base system electrocatalytic property;

The invention discloses a preparation method and application of Zr-MOF modified magnetic straw biochar filler, and belongs to the technical field of water pollution treatment and ecological remediation, the method comprises the following steps: adding powdery straw into a solution of ferrous ions and ferric ions, stirring and performing ultrasonic treatment, and performing high-temperature pyrolysis on the dried powdery straw to prepare magnetic biochar; zirconium salt, the magnetic straw biochar and terephthalic acid are added into an N, N-dimethylformamide solution, the mixture is stirred and subjected to ultrasonic treatment, then the mixture is put into a polytetrafluoroethylene reaction kettle for a reaction, after the reaction is finished, N, N-dimethylformamide and absolute ethyl alcohol are used for cleaning, and after drying, the Zr-MOF modified magnetic straw biochar filler is obtained. Plant straw is used as a biochar raw material, biochar is modified through Zr-MOF and ferric salt, the porous structure and the specific surface area of the Zr-MOF modified magnetic straw biochar filler can be remarkably improved, the structural stability and the adsorption activity of the filler can be enhanced, refractory organic pollutants in a water body are efficiently removed, and soil pollutants are adsorbed and fixed.

The present invention relates to the technical field of gas adsorption materials, and in particular to a zeolite molecular sieve composite material loaded with MOFs, and a preparation method and application thereof. The zeolite molecular sieve composite material loaded with MOFs comprises the following raw materials: solid AgNO3, 2-aminoterephthalic acid, N,N dimethylformamide, Ag-zeolite molecular sieve, and the amount ratio of the solid AgNO3, 2-aminoterephthalic acid, N,N dimethylformamide, and Ag-zeolite molecular sieve is (0.012-0.037) mol: (0.009-0.026) mol: (50-300) ml: (20-75) g. The present invention utilizes zeolite molecular sieve as a base material, and after the zeolite molecular sieve is impregnated and modified with a silver nitrate solution, a certain amount of silver ions is loaded, and then the material MOFs is grown in situ, and the pore size advantages of the zeolite molecular sieve and MOFs are coordinated to prepare a composite material with a large specific surface area and beneficial to the radon gas adsorption effect.

A method for preparing a supported catalyst, including mixing waste lithium battery cathode material and biomass uniformly to obtain a mixture, then putting the mixture into a tube furnace for nitrogen purging, and then heating and calcining to obtain a solid sample after carbothermal reduction treatment; hydrothermally stirring the solid sample, followed by filtration to recover a residue, and drying the residue to obtain a mixed sample of Co3O4, TiO2, and biochar, labeled as TCO; ultrasonically dispersing the attapulgite in an acid solution, stirring in a water bath at 80° C. to obtain a product, washing the product until neutral, filtering, and then drying to obtain an acidified attapulgite (H-ATP); and weighing the TCO, ultrasonically dispersing the TCO in a mixed solution of deionized water and N, N dimethylformamide (DMF), adding the H-ATP into the mixed solution, and performing a microwave hydrothermal reaction, obtaining a sample after centrifuging, washing, and drying, and then performing muffle calcination on the sample to obtain the supported catalyst Co3(Ti)O4 / H-ATP.

The invention belongs to the technical field of plastic materials, and particularly relates to a plastic prosthetic material and a preparation method thereof. The preparation method comprises the following steps: (1) pretreating carbon fibers to obtain pretreated carbon fibers; (2) modifying the carbon fiber by using KH792 to obtain silane modified carbon fiber; (3) mixing the silane carbon fiber with N, N-dimethylformamide, continuously adding polyethylene glycol diacetate and a condensing agent, carrying out a heating reaction, and carrying out rotary evaporation to remove N, N-dimethylformamide so as to obtain modified carbon fiber; and (4) uniformly mixing the PEEK powder, the modified carbon fibers and the carboxylated carbon nanotubes, and carrying out mold pressing to obtain the prosthetic material for the plastic surgery department. The prosthetic material for the plastic surgery department is safe to use, high in mechanical property and good in fatigue resistance.

The application discloses a natural plant-based surfactant for high-temperature-resistant synthetic drilling fluid and a preparation method thereof. A raw material composition comprises natural organic matter, an acid-binding agent, N,N dimethylformamide and a compound containing a long-chain acyl chloride or amine-based monomer. The natural plant-based surfactant for high-temperature-resistant synthetic drilling fluid comprises a compound with a terpene cyclic skeleton, a lipophilic group and a hydrophilic group, wherein the molecular structure of the terpene cyclic skeleton has a stacking constant P greater than 1. The technical scheme of the application obtains a rigid surfactant based on a natural terpene polycyclic skeleton, controls the aggregation and self-assembly behavior of the surfactant at an oil-water interface, and makes the system easy to form a water-in-oil emulsion system. The surfactant can be protected at a high temperature, can still maintain good surface activity at a higher temperature, can maintain the use of the drilling fluid system in a deep reservoir, and thus the purposes of preventing well leakage pollution, well wall collapse and safe drilling are achieved.

The invention belongs to the technical field of high polymer materials, and discloses a method for preparing a polyamide nanofiltration membrane based on non-reactive ionic liquid, which comprises the following steps: preparation of a substrate PES membrane: weighing 16wt% of polyether sulfone PES, 16wt% of polyethylene glycol PEG and 68wt% of N-N dimethylformamide DMF, putting into a round-bottom flask, stirring in a water bath kettle, standing at the same temperature to remove bubbles, and then, adding the substrate PES membrane into the round-bottom flask to obtain the substrate PES membrane; casting the casting solution on a glass plate by using a steel knife, and immersing the glass plate in ultrapure water to remove the residual solvent; and preparation of a polyamide (PA) membrane: carrying out interfacial polymerization on a water phase solution containing piperazine (PIP) and chlorinated 1-butyl-3-methylimidazole and an oil phase solution containing TMC, and synthesizing a polyamide active layer on the PES membrane. The invention provides a new view angle for regulation and control of monomer diffusion and reaction in the interfacial polymerization process, and particularly has important application potential in the aspect of preparation of high-performance polyamide composite membranes.

The invention provides an anti-adhesion coating suitable for low-medium-high viscosity liquid as well as a preparation method and application of the anti-adhesion coating. The preparation method comprises the following steps: taking polyvinylidene fluoride (PVDF) as a main component, doping two types of modified SiO2 particles as a filler, taking amine-terminated polyether D230 as a molecular bridging substance, taking a mixed solution of N-N dimethyl formamide (DMF) and N-methyl-2-pyrrolidone (NMP) as a solvent, combining a sol-gel method with a spraying process, and combining a non-solvent induced phase separation (NIPS) strategy to obtain the anti-adhesion coating. According to the preparation method, the viscosity threshold value of a traditional coating capable of repelling liquid is broken through through multi-scale structural design, mutual repulsion between PVDF and modified SiO2 particles which are weak in polarity is converted into stable C-N-F bonding effect through introduction of an active amino-terminated D230 molecular bridge material, the bottleneck that a traditional system structure is unstable is broken through, and the preparation method is suitable for large-scale preparation of PVDF / modified SiO2 / PVDF composite coating. The prepared broad-spectrum anti-adhesion coating has broad-spectrum anti-adhesion range, mechanical stability and chemical durability, and can be widely applied to a plurality of fields, especially the occasions of filling, storage, mixing, conveying and the like related to high-viscosity liquid.

The application discloses a hyperbranched magnetic modified MOFs-based composite material and a preparation method and application thereof, and the preparation steps of the hyperbranched magnetic modified MOFs-based composite material include the following steps: preparing a magnetic Fe3O4 magnetic material or purchasing a commercially available one; preparing a Zn-MOF material by using sodium hydroxide, trimesic acid, N-N dimethylformamide, ethanol and zinc acetate dihydrate; preparing a carboxyl-terminated hyperbranched polymer by using diethanolamine, methanol, methyl acrylate, trimethylolpropane, p-toluene sulfonic acid and maleic anhydride; and reacting the magnetic Fe3O4 with the Zn-MOF and the carboxyl-terminated hyperbranched polymer to obtain the hyperbranched magnetic modified MOFs-based composite material. The hyperbranched magnetic modified MOFs-based composite material prepared by using the application can remove the chroma in water, can realize the effect of low dosage and high removal rate, and has stable recycling regeneration effect and high removal efficiency.

The invention relates to the technical field of compound detection, and discloses a method for determining the content of azodicarbonamide in a rubber and plastic thermal insulation product. The method comprises the following steps: 1) preparing a standard solution; 2) drawing a standard curve; 3) accelerated solvent extraction (ASE) treatment is performed on the sample, and specific parameters of the sample ASE treatment are as follows: the extraction solvent is N, N-dimethylformamide (DMF) with the volume of 100%, the extraction pressure is 1500 psi, the solvent flushing volume is 60% of the volume of a pool, the extraction pool is a stainless steel extraction pool with the volume of 34 mL, nitrogen purging is performed for 100 s, the extraction temperature is 65-85 DEG C, the extraction time is 5-15 min, and the cycle index is 1-2 times; (4) the sample is subjected to high performance liquid chromatography (HPLC) determination, and the test conditions of HPLC are as follows: a chromatographic column is ZORBAX SB-Aq (4.6 mm * 250 mm, 5 [mu] m); the column temperature is 30-40 DEG C; the mobile phase comprises the following components in percentage by volume: 80-100% of ultrapure water and 0-20% of methanol; the flow rate is 0.8 to 1.0 mL / min; and the wavelength of a DAD detector is 244 to 275 nm. According to the method, the ASE pretreatment technology is applied, selective extraction and online purification can be achieved through the ASE method, and the content of azodicarbonamide in the rubber and plastic heat preservation product can be accurately detected.

The invention discloses a method for detecting benzene and 1, 2-dichloroethane in activated carbon and application of the method, aiming at solving the problem that a method for detecting the benzene and the 1, 2-dichloroethane in the activated carbon is lacked at present, and realizing qualitative or quantitative detection of a residual solvent of the benzene or the 1, 2-dichloroethane in the activated carbon so as to ensure the quality of the activated carbon. And the safety of the injection production process is improved. N, N-dimethylformamide or dimethyl sulfoxide is selected as the solvent, so that the toxicity of the test solvent is remarkably reduced. The activated carbon has high adsorption activity on benzene, toluene or ethylbenzene or xylene is used as an internal standard substance for benzene content determination, the desorption effect of N, N-dimethylformamide or dimethyl sulfoxide on activated carbon of different sources is corrected through an internal standard, and the accuracy of a benzene content result can be obviously improved. A headspace sampling method is selected, a mixed solvent of water and N, N-dimethylformamide or dimethyl sulfoxide is used, and the sensitivity of the method is improved through azeotropy of the mixed solvent.

The invention discloses a rhenium recovery functional material and a preparation method thereof. The preparation method comprises the following steps: weighing 10-50g of chlorine balls in a 100ml beaker, then adding 10-40g of N, N-dimethylformamide, ensuring that the chlorine balls are completely immersed, and immersing for 2-4 hours; weighing an N-ethyl thiourea aminating agent according to a preset proportion of the available chlorine content to amine, and putting the N-ethyl thiourea aminating agent into a constant-pressure separating funnel; heating the reaction system in a water bath, dropwise adding an N-ethyl thiourea aminating agent within 2-3 hours, dropwise adding a sodium hydroxide solution into the reaction bottle after the aminating agent is dropwise added, adjusting the pH value of the reaction system to 5-12, and continuing to react for 6-14 hours; after the reaction is finished, repeatedly cleaning the resin by using deionized water until the cleaned solution is neutral, and removing residual impurities and reaction byproducts; drying in a vacuum environment to obtain a dried rhenium recovery functional material; the method can solve the problem of insufficient desorption capability when ammonium perrhenate is recovered by using ammonia water.

The application belongs to the technical field of polymer materials, and discloses a method for preparing a polyamide nanofiltration membrane based on a non-reactive ionic liquid, which comprises the following steps: preparation of a substrate PES membrane: 16wt% of polyethersulfone PES, 16wt% of polyethylene glycol PEG, and 68wt% of N-N dimethylformamide DMF are weighed and placed in a round-bottom flask, stirred in a water bath, and left to stand at the same temperature to remove air bubbles, then, the casting solution is cast on a glass plate with a steel knife and immersed in ultrapure water to remove residual solvent; preparation of a polyamide PA membrane: interfacial polymerization is performed on the PES membrane by using an aqueous phase solution containing piperazine PIP and 1-butyl-3-methylimidazole chloride and an oil phase solution containing TMC to synthesize a polyamide active layer. The application provides a new perspective for the regulation of monomer diffusion and reaction in the interfacial polymerization process, and has important application potential in the preparation of high-performance polyamide composite membranes.

The invention discloses a cellulose-based fire-resistant triboelectric material and a preparation method thereof, and belongs to the technical field of functional materials. The preparation method of the material comprises: (1) taking methanol, deionized water and oleic acid, stirring and mixing, adding sodium hydroxide solution, calcium chloride solution and sodium dihydrogen phosphate dihydrate solution, stirring, transferring the obtained mixed solution to a reactor for hydrothermal reaction, taking out the product after the reaction, washing, drying, and obtaining hydroxyapatite; (2) taking nanocellulose pulp and adding it to N,N dimethylformamide solution, stirring, ultrasonic treatment, centrifugation, and dispersing hydroxyapatite in the solution, stirring, adding isophorone diisocyanate and dibutyltin dilaurate, and subjecting the obtained mixed solution to esterification reaction at high temperature, centrifuging the solution after the reaction, washing, centrifuging, and filtering the obtained precipitate, and obtaining the composite material. The material prepared by the invention has good fire-resistant and flame-retardant properties by grafting hydroxyapatite on the surface of nanocellulose.

The invention discloses a near-infrared fluorescent probe as well as a preparation method and application thereof. The near-infrared fluorescent probe has a structure as shown in a compound 1. The fluorescent probe obtained by the preparation method has stronger ultraviolet in a near-infrared region; cysteine can be rapidly and efficiently detected in a mixed solution formed by N, N-dimethylformamide and water, and a new absorption peak is generated at 750nm. The fluorescent probe obtained by the preparation method has stronger fluorescence in a near-infrared region; the cysteine can be rapidly and efficiently detected in a mixed solution formed by N, N-dimethylformamide and water, and the fluorescence at 702nm can be gradually quenched along with the increase of the concentration of the cysteine.

The application relates to an electrode fiber, in particular to an electroluminescent bifunctional electrode fiber and application of the electrode fiber in preparation of an electroluminescent device, and belongs to the technical field of electroluminescent electronic devices. The bifunctional electrode fiber is prepared by the following method: taking a zinc wire with a diameter of 0.3-2.0 mm as a core wire, adopting a spinning solution to electrostatically spin on the surface of the zinc wire to form a nanofiber layer, and preparing the bifunctional electrode fiber; the spinning solution contains 15-25% of thermoplastic polyurethane, 5-20% of zinc copper sulfide, 2-10% of PDMS, and the rest is a solvent composed of N-N dimethylformamide and tetrahydrofuran. The application integrates two functions on one electrode fiber, can easily prepare a fibrous zinc ion battery and a fibrous electroluminescent device by changing the formula of an electrolyte, and can also introduce a third fiber into the fibrous zinc ion battery to endow the battery with the electroluminescent capability.

The application discloses a quasi-two-dimensional perovskite light-emitting film based on atmosphere regulation and a preparation method thereof, and belongs to the field of luminescent materials and nanotechnology. The preparation method of the quasi-two-dimensional perovskite light-emitting film comprises the following steps: dissolving macromolecular cationic organic matter, monovalent cation halide and divalent cation halide in a polar organic solvent to obtain a precursor solution; and placing the precursor solution in an environment containing a special atmosphere to perform two-stage spin coating to obtain the quasi-two-dimensional perovskite light-emitting film. The special atmosphere is an atmosphere formed by volatilization of one or more of dimethyl sulfoxide, N-N dimethylformamide, isopropyl alcohol, ethyl acetate, chlorobenzene and toluene. According to the application, the composition ratio of the atmosphere environment can be regulated to realize light emission in the range of 380 nm-800 nm visible light-near infrared, and the quasi-two-dimensional perovskite film with excellent light-emitting performance, high environmental stability and high phase purity can be rapidly obtained without annealing and anti-solvent treatment.

The invention discloses a CFNB metal-free redox catalyst and a preparation method and application thereof, and belongs to the technical field of electrochemical catalytic materials, the CFNB metal-free redox catalyst is composed of a carbon material co-doped with three heterogeneous elements of fluorine, nitrogen and boron, and has a three-dimensional cross-linked nano network structure; the preparation method comprises the following steps: jointly dissolving the polyalcohol ether borate, the polydopamine and the polyvinylidene fluoride hexafluoropropylene copolymer in N-N dimethylformamide according to a mass ratio of (1-5): (1-5): (1-5), and stirring until the materials are uniformly mixed; the obtained mixed solution is subjected to electrostatic spinning, the spinning voltage is 12-18 kV, the receiving distance is 15-20 cm, the flow velocity is 0.05-5 mL / h, and an aluminum foil serves as a receiving base material; the obtained spinning product is subjected to carbonization treatment in an inert atmosphere, calcination is conducted for 1-4 h at the calcination temperature of 700-950 DEG C, and the CFNB metal-free oxygen reduction catalyst is obtained and has better catalytic activity and stability.

The invention discloses a universal preparation method of an ultrathin palladium-based nanosheet, which uses ethylene glycol and N-N dimethylformamide (DMF) as solvents, and adopts a simple solvothermal method to reduce palladium ions and other metal ions into ultrathin palladium-based nanosheets with regular shapes and uniform sizes. The palladium-based nanosheets prepared by the invention have a unique two-dimensional structure, a large surface area and abundant active centers, enhance the adsorption capacity of nitrogen, reduce the reduction reaction barrier of nitrogen on its surface, and have good application prospects in the nitrogen reduction reaction process. The preparation method of the ultrathin palladium-based nanosheet of the invention is simple, economical, and suitable for industrial large-scale production.

The invention relates to the technical field of PET polyester, in particular to an MOF catalyst for synthesizing PET and a preparation method of the MOF catalyst, the molecular expression is Sb-SBME-UiO-66, and SBME is thiobenzyl ether. The preparation method comprises the following steps: dispersing zinc tetrachloride and terephthalic acid into a first mixed solution of N-N dimethyl amide and ethylene glycol for reaction, and centrifuging after the reaction to obtain a white precipitate; the white precipitate is washed, and a UiO-66 matrix is obtained; the preparation method comprises the following steps: mixing ethylene glycol antimony and thiobenzyl methyl ether in ethylene glycol, reacting, and centrifuging to obtain an antimony precursor; and mixing and dispersing the UiO-66 matrix and the antimony precursor in a second mixed solution of N-N dimethylformamide and ethylene glycol, stirring to activate the UiO-66 matrix and the antimony precursor, heating, and continuously reacting to obtain the MOF catalyst. The MOF catalyst for synthesizing PET and the preparation method of the MOF catalyst aim at solving the problem that a catalyst for synthesizing PET is poor in catalytic activity and thermal stability.

The invention discloses a chiral upset super-long room temperature phosphorescent polymer with light activation characteristic and application thereof, and belongs to the technical field of organic photoelectric functional materials, the chiral upset super-long room temperature phosphorescent polymer with light activation characteristic provided by the invention is simple in synthesis step and low in preparation cost, and the specific synthesis method is as follows: in a nitrogen environment, the chiral upset super-long room temperature phosphorescent polymer with light activation characteristic is prepared by a one-step synthesis method of the chiral upset super-long room temperature phosphorescent polymer with light activation characteristic. The method comprises the following steps: dissolving R-configuration or S-configuration binaphthalene-diphenylphosphine in N-N dimethylformamide, adding 1-bromopropane, heating and stirring at 120 DEG C for 72 hours, then carrying out reduced pressure distillation and spin drying, and then carrying out chromatographic column purification to obtain a compound R-1 or a compound S-1. According to the time response type multiple information encryption method provided by the invention, the time response type information encryption materials with different matrixes are prepared by utilizing the compound R / S-1, and different information is encrypted by adopting the time response type information encryption materials with different matrixes, so that multiple information encryption is realized.

The invention relates to the field of PPO resin copper-clad plates, and particularly discloses a silicon dioxide filled PPO resin-based copper-clad plate and a preparation method thereof. The preparation method comprises the following steps: reacting silicon dioxide with acryloyl chloride to obtain vinylated silicon dioxide; taking AIBN as an initiator, and reacting vinyl on the etherified silicon dioxide with sulfydryl on the 5-fluoro-2-sulfydryl benzyl alcohol under the irradiation of an ultraviolet lamp to obtain fluorinated silicon dioxide; reacting the fluorinated silicon dioxide with acryloyl chloride again to obtain modified silicon dioxide; the preparation method comprises the following steps: carrying out micromolecularization on polyphenyl ether, introducing hydroxyl groups at two ends of the polyphenyl ether, and reacting the polyphenyl ether with acryloyl chloride to obtain modified polyphenyl ether; uniformly mixing polyphenyl ether, modified polyphenyl ether, modified silicon dioxide, benzoyl peroxide and N, N-dimethylformamide to prepare a PPO resin composition prepreg; and soaking glass fiber cloth in the PPO resin composition prepreg, drying to obtain prepregs, overlapping the prepregs, coating copper foils on two surfaces, and pressing to obtain the copper-clad plate.

A graphene-coated V3S4@NC material and a preparation method therefor and the use thereof. The material is composed of V3S4@NC and graphene coated on the surface of V3S4@NC, wherein V3S4@NC is of a core-shell structured nanofiber composite material with a V3S4 core and an NC shell. The method comprises the following steps: step I: adding a sulfur powder, vanadyl acetylacetonate (VO(acac)2), polyacrylonitrile (PAN), and graphene oxide to N-N dimethylformamide (DMF), stirring same for 12 h, followed by ultrasonic oscillation to obtain a mixed solution; step II: filling a syringe with the mixed solution obtained in step I, performing electrostatic spinning at a flow rate of 0.4 mL / h under a voltage of 18 kV, and collecting a product, so as to obtain a precursor; and step III: placing the collected precursor in a protective atmosphere, and annealing same at 800 ºC for 3 h to obtain a graphene-coated V3S4@NC material. The product can enable the reduced transport distance of sodium ions, and improvement of the electrochemical performance thereof.

The present invention relates to a method of preparing a black phosphorus nanosheet and application, belonging to the technical field of functional material production. In the method, the black phosphorus sheet is used as the electrolytic anode, and an electrochemical reaction system is constructed together with an inert electrode and an alkaline aqueous electrolyte, wherein the alkaline aqueous electrolyte comprises an N-N dimethylformamide solution dissolved with epoxy resin. In alkaline aqueous electrolyte, the prepared black phosphorus nanosheet structure tends to be more stable, not easy to be damaged and the oxidation degree is reduced. Under alkaline conditions, it is conducive to improve the intercalation and stripping effect of black phosphorus material of anode and make the black phosphorus exfoliation more complete.

The invention discloses a PLA-based flexible triboelectric material with a core-shell structure for enhancing flame retardance and high temperature resistance and a preparation method of the PLA-based flexible triboelectric material, and belongs to the technical field of triboelectric materials. The preparation method comprises the following technical steps: (1) adding carboxylated multi-walled carbon nanotubes into dichloromethane and N, N-dimethylformamide, and carrying out ultrasonic dispersion to obtain a dispersion liquid; (2) adding polylactic acid into the dispersion liquid, and carrying out magnetic stirring to obtain a core layer spinning solution; (3) adding calcium phytate and polylactic acid into dichloromethane and N, N-dimethylformamide, and carrying out magnetic stirring to obtain a shell spinning solution; (4) respectively filling the core spinning solution and the shell spinning solution into two push injectors, and carrying out coaxial electrostatic spinning to obtain a PLA-based nanofiber membrane; and (5) drying in a drying box to obtain the PLA-based flexible triboelectric material. According to the invention, a PLA / C-MWCNT core layer solution and a PLA / PA-Ca shell layer solution are subjected to coaxial electrostatic spinning to obtain the material with flame retardance, high temperature resistance and high triboelectric property.