553 results about "Dimethylacetamide" patented technology

The invention relates to a preparation method of an amino-functionalized metal organic framework material and application of the prepared material to separation of CO2 / N2 and CO2 / CH4. The preparation method comprises the following steps: dissolving adenine and copper nitrate trihydrate in N, N '-dimethylacetamide to obtain a first mixed solution; dissolving carboxylic acid and potassium carbonate in deionized water to obtain a second mixed solution; and adding the second mixed solution into the first mixed solution, carrying out stirring reaction, and carrying out vacuum drying on an obtained solid product to obtain the amino-functionalized metal organic framework material. The amino-functionalized metal organic framework material prepared by the invention has high CO2 adsorption selectivity and adsorption capacity, and also has good acid-resistant, alkali-resistant and water-resistant stability. The amino-functionalized metal organic framework material prepared by the preparation method disclosed by the invention is applied to industrial CO2 adsorption separation and has an excellent separation effect.

The invention discloses a synthesis method of a covalent organic framework crystal material at normal temperature, and belongs to the technical field of covalent organic framework synthesis. The synthesis method of the covalent organic framework crystal material at normal temperature comprises the following steps: S1, dissolving an ammonia monomer in a first solvent to obtain an ammonia monomer solution; dissolving an aldehyde monomer in a second solvent to obtain an aldehyde monomer solution; the first solvent or the second solvent is one or two of N, N-dimethylacetamide and dichloromethane; s2, mixing and reacting the ammonia monomer solution, the aldehyde monomer solution, a catalyst and a third solvent to obtain the covalent organic framework crystal material. According to the synthesis method provided by the invention, the covalent organic framework crystal material can be synthesized at a relatively low temperature within a short time.

The invention discloses a fluralamide moxidectin drop and a preparation method thereof, and relates to the technical field of veterinary drugs. The drop is prepared from the following components in parts by weight: 26 to 26.5 parts of fluralan, 1.32 parts of moxidectin, 0.10 part of butylated hydroxytoluene, 29.5 to 30.5 parts of dimethylacetamide, 19.5 to 20 parts of tetrahydrofuran polyethylene glycol ether, 13 to 13.5 parts of diethyl toluamide, 8.5 to 9.3 parts of acetone and 1.0 to 1.5 parts of ethanol. The invention has the effects of improving the stability, permeability and lasting effect of the medicine.

The invention discloses a microporous breathable fabric as well as a preparation method and application thereof, and relates to the technical field of fabric treatment. The invention discloses a preparation method of a microporous breathable fabric, which comprises the following steps: coating the surface of a base cloth with a polyurethane coating agent, and drying to obtain the microporous breathable fabric, the polyurethane coating agent is prepared from the following raw materials in parts by weight: 100 parts of organic silicon modified polyurethane emulsion, 8 to 11 parts of N, N-dimethylacetamide, 2 to 2.5 parts of n-caprylic alcohol, 5 to 8 parts of a foam homogenizing agent and 1 to 3 parts of a thickening agent PTF; the organic silicon modified polyurethane emulsion is obtained by crosslinking polyurethane with carboxymethyl cellulose through silica sol; the polyurethane coating agent prepared by taking the organic silicon modified polyurethane emulsion as the base material is coated on the surface of the base cloth, so that the fabric has high waterproof performance and also has high air permeability and moisture permeability; the microporous breathable fabric prepared by the invention is applied to the field of outdoor sportswear, and comfortable wearing experience is provided.

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 discloses a polyimide and epoxy resin composite modified fluorocarbon resin coating and a preparation method thereof, and the polyimide and epoxy resin composite modified fluorocarbon resin coating comprises the following components in percentage by weight: 0.4-0.8% of monomer diamine, 0.4-0.8% of monomer dianhydride, 60-70% of N, N-dimethylacetamide, 10-20% of epoxy resin, 0.2-0.5% of epoxy curing agent, 1-2% of fluorocarbon resin curing agent and 15-25% of fluorocarbon resin. The preparation method comprises the following specific steps: reacting monomer diamine and dianhydride in N, N-dimethylacetamide, sequentially compounding with epoxy resin and an epoxy curing agent to obtain a composite modifier, and adding the composite modifier and a fluorocarbon resin curing agent into a fluorocarbon resin solution to obtain the polyimide and epoxy resin composite modified fluorocarbon resin coating. Compared with an existing fluorocarbon resin coating, the performance of the fluorocarbon resin coating is greatly improved in the aspects of mechanical performance, heat resistance, adhesive force and the like.

The invention relates to the technical field of layered composite fabrics, in particular to a bio-based antibacterial fiber fabric and a preparation method thereof. The preparation method comprises the following steps: carrying out a reaction on diisocyanate, polyether polyol, bio-based polyester polyol and hexamidine dihydroxyethyl sulfonate in N, N-dimethylacetamide, so as to obtain a polyurethane prepolymer solution; 2-(4-aminophenyl)-5-aminobenzimidazole and amino-modified nano-zinc oxide are sequentially added into the polyurethane prepolymer solution for a reaction, a prepared polyurethane spinning solution is subjected to dry spinning to prepare polyurethane fibers, and then the polyurethane fibers are sequentially spun into yarn and fabric; the bio-based nylon is subjected to melt spinning to obtain bio-based nylon fibers, and the bio-based nylon fibers are sequentially spun into yarns and fabrics; the bio-based antibacterial fiber fabric is prepared by taking a polyurethane fabric as an inner-layer fabric and taking a bio-based chinlon fabric as an outer-layer fabric, and the fabric is good in antibacterial performance and moisture absorption performance.

To provide: a cleaning fluid having improved removability of stains due to impurities: and a cleaning method using the cleaning fluid.SOLUTION: Provided is a cleaning fluid, comprising a solvent and a metal remover. The cleaning fluid includes two or more kinds of solvents, the distance (HSP distance) between the Hansen solubility parameter of the cleaning fluid and the Hansen solubility parameter of dimethylacetamide is 1.0 or less, and the content of metal impurities is 0.1×10-9 pts.mass or more to 102×10-6 pts.mass or less relative to 100 pts.mass in total of the solvent and the metal remover.SELECTED DRAWING: None

The present invention relates to the field of the preparation of polyurethane elastic fibers, and relates to a preparation method for a bio-based polyurethane elastic fiber, comprising: preparing polyether polyol from sucrose, glycerol, dimethylamine and propylene oxide; adding a solvent, i.e., N,N-dimethylacetamide, and polyether polyol and polyisocyanate into a reaction tank, and adding p-Toluenesulfonyl semicarbazide and aluminum methylenebis(2,4-di-tert-butylphenoxy) phosphate to prepare a spinning solution; and subjecting the spinning solution to spinning and oil application by means of dry spinning technology to obtain the bio-based polyurethane elastic fiber. The present invention ensures that the properties of polyurethane elastic fibers do not deteriorate or are partially enhanced, while the cost and performance advantages are achieved.

The invention discloses a preparation method of an MOF-on-MOF material, and belongs to the technical field of electrocatalysts.The preparation method comprises the steps that firstly, nickel acetate tetrahydrate and terephthalic acid are added into a mixed solvent composed of deionized water and N, N-dimethylacetamide, stirring reaction is conducted at the temperature of 140-160 DEG C, and Ni-MOF is synthesized; mixing and dissolving ferric nitrate nonahydrate and cobalt nitrate in a molar ratio of 1: 5 in deionized water, then adding a sodium acetate aqueous solution, and synthesizing a Fe2Co (mu3-O) cluster after stirring reaction; and then adding the Ni-MOF and the Fe2Co (mu3-O) cluster into deionized water, carrying out ultrasonic treatment, carrying out solid-liquid separation, and washing and drying a solid product to obtain the Ni-MOF / Fe2Co (mu3-O) cluster. Compared with an existing method, the method is easy to operate and low in cost, and the prepared MOF-on-MOF material has excellent electrocatalytic activity and stability in an electrocatalytic oxygen evolution reaction and is particularly suitable for being used in the field of hydrogen production through water electrolysis.

The application discloses a preparation method of a hydrophilic oil-water separation anti-pollution membrane and the anti-pollution membrane and application thereof, and prepares MNRs material; the MNRs material is dispersed in dimethylacetamide, is uniformly stirred, polyvinylpyrrolidone is added, and stirring is continued, and a first mixture is obtained through ultrasonic treatment; the first mixture is mixed with polyvinylidene fluoride to obtain a second mixture, and the second mixture is stirred; the treated second mixture is dip-coated on a carrier, the dip-coated carrier is treated in deionized water to obtain an ultrafiltration membrane; the ultrafiltration membrane is soaked in a tea polyphenol solution with a Tris-HCl buffer solution, and is shaken to obtain the hydrophilic oil-water separation anti-pollution membrane. The hydrophilic oil-water separation anti-pollution membrane has excellent separation efficiency and flux recovery rate for four different oil-water mixtures of kerosene, gasoline, edible oil and n-hexane. The preparation process of the oil-water separation membrane is simple, the cost is low, and the reaction condition is mild; when the oil-water separation membrane is applied to organic wastewater separation, the oil-water separation membrane has the advantages of high efficiency, good removal performance and good recycling performance.

The invention is applicable to the field of preparation of modified polyimide materials, and provides a transparent polyimide film material with corona resistance and a preparation method thereof, the transparent polyimide film material comprises the following raw materials: nano SiO2 particle-N, N-dimethylacetamide dispersion liquid, a diamine monomer, a benzoxazine monomer and a dianhydride monomer; wherein the N, N-dimethylacetamide dispersion liquid contains nano silicon dioxide (the particle size is about 10-20 nm, and the mass fraction is 30 wt% + / -5 wt%). The transparent polyimide film with corona resistance is prepared by uniformly dispersing nano silicon dioxide particles and benzoxazine in a polyimide matrix by adopting an in-situ polymerization method, the film realizes excellent corona resistance of a material, and meanwhile, the preparation method has the advantages of simple process, energy conservation, environmental protection, high efficiency and the like.

The present invention employs a cleaning liquid containing a solvent and a metal remover. In the cleaning liquid, two or more solvents are included, the distance (HSP distance) between the Hansen solubility parameter of the cleaning liquid and the Hansen solubility parameter of dimethylacetamide is 1.0 or less, and the total content of an organic substance selected from the group consisting of organic acid multimers, organic acid esters, and ketone bodies is 0.1 × 10-9 parts by mass or more and 105 × 10-6 parts by mass or less with respect to 100 parts by mass of the total of the solvent and the metal remover. This cleaning liquid improves removal of organic impurities.

A method for catalyzing selective oxidation of 5-hydroxymethylfurfural by ion-doped birnessite belongs to the field of chemical engineering, and comprises the following steps: adding an ion-doped birnessite type catalyst into a solvent, and catalyzing 5-hydroxymethylfurfural to prepare 2, 5-furandicarboxaldehyde and 2, 5-furandicarboxylic acid in the atmosphere of air or oxygen at the temperature of 25-240 DEG C, wherein the solvent is water, methanol, ethanol, acetonitrile, dichloromethane, N, N-dimethylformamide, N, N-dimethylacetamide and the like. The method is simple, few in by-products and environmentally friendly. By adopting ion-doped birnessite as the catalyst, the method has the advantages of economy, environmental protection, mild conditions, high selectivity, easiness in recovery of the catalyst and the like; the ion-doped birnessite catalyst can efficiently and highly selectively catalyze oxidation of 5-hydroxymethylfurfural to prepare 2, 5-furandicarboxaldehyde, catalytic materials are easy to separate, the production cost is low, and the ion-doped birnessite catalyst has remarkable technical and economic effects and application prospects.

The invention discloses a preparation method of a vanadium battery electrolyte oxidation corrosion resistant composite membrane, which comprises the following steps: S1, uniformly dispersing graphene oxide nanosheets on the surface of an SPEEK (sulfonated polyether ether ketone) matrix by using sulfonated polyether ether ketone as a substrate to obtain an SPEEK / GO (graphene oxide) substrate; s2, treating the SPEEK / GO substrate in oxygen plasma treatment equipment, and ultrasonically cleaning the SPEEK / GO substrate with isopropanol for 10-20 minutes; s3, dissolving polybenzimidazole in N, N-dimethylacetamide (the concentration is 3-5wt%), and magnetically stirring until the polybenzimidazole is completely dissolved; the preparation method comprises the following steps: adding TiO2 nanoparticles (the particle size is 20-25nm, and the TiO2 nanoparticles are pretreated by a silane coupling agent KH-570) according to the mass ratio of 15-20%, ultrasonically dispersing and carrying out ice bath to obtain PBI-TiO2 dispersion liquid; s4, the SPEEK / GO substrate treated in the step S1 is vertically immersed in PBI-TiO2 dispersion liquid, the final coating thickness is 1.5 + / -0.2 [mu] m, and a pretreated film is obtained; and S5, carrying out hot pressing on the pretreated membrane by using a hot press, and then carrying out gradient cooling to room temperature to obtain the final composite membrane. The vanadium battery is better in vanadium resistance and corrosion resistance and suitable for high-power-density vanadium batteries.

The application relates to a preparation method of a hollow fiber membrane composite thermal insulation material, which comprises the following steps: adding 18-22% of polyurethane, 4-8% of polyethylene glycol 2000 and 72-76% of N,N-dimethylacetamide into a spinning reaction kettle to mix, stir and defoam to prepare homogeneous casting solution; based on a non-solvent induced phase separation method, the homogeneous casting solution is coated on the surface of a polyester braided tube through a spinneret by adopting a concentric circle composite spinning technology, is gathered on a spinning wheel after a coagulation bath to form a reinforced polyurethane hollow fiber membrane assembly which is arranged in parallel and obliquely crosses and is mutually bonded, and the fiber membrane assembly is hot-pressed to prepare the hollow fiber membrane composite thermal insulation material under the conditions of a temperature of 60-150 DEG C and a pressure of 120-470 MPa. Since the coating layer and the braided tube are both through porous structures, the prepared composite material has good air permeability.

The invention relates to the field of composite ultrafiltration membranes, in particular to a GO / PVDF composite ultrafiltration membrane for MBR and a preparation method of the GO / PVDF composite ultrafiltration membrane. The GO / PVDF composite ultrafiltration membrane is prepared by adopting 18% of polyvinylidene fluoride as a membrane base material, 6% of polyvinylpyrrolidone as a pore-foaming agent, 0-2% of graphene oxide as a modifier and the balance of N, N-dimethylacetamide as a solvent through an impregnation phase inversion method. The GO with low mass fraction is added into the section of the membrane to form a large and thick finger-shaped pore structure, the filtration resistance of membrane pores is reduced, the filtration flux, hydrophilicity, permeability and interception performance of the membrane are improved, the method is simple to operate, the prepared finished product is excellent in performance, and the research and application expansion of a membrane modification technology are promoted.

The invention discloses a low-temperature aqueous sodium-ion battery electrolyte and a preparation method thereof, and belongs to the technical field of sodium-ion batteries. The electrolyte comprises a sodium salt and a solvent system, the concentration of the sodium salt is 0.5-2.5 mol / L, and the solvent system is composed of water and a solvent with the dielectric constant larger than 30 and the freezing point lower than-20 DEG C. Particularly, the solvent system is composed of water and N, N-dimethylacetamide, the volume ratio of the water is 50-70 vol%, and the volume ratio of the N, N-dimethylacetamide is 30-50 vol%. By introducing the solvent with low freezing point and high dielectric constant, the conductivity of the electrolyte under the low temperature condition is effectively improved, the freezing point of the electrolyte is remarkably reduced, and the sodium ion battery assembled by the electrolyte can still keep excellent charge-discharge performance and cycle life under the low-temperature environment of-40 DEG C.

The invention discloses a preparation method of a polyimide-boron nitride nanosheet heat-conducting composite film. The preparation method comprises the following steps: firstly, dispersing boron nitride nanosheets into N, N-dimethylacetamide containing poly (diallyldimethylammonium chloride) to prepare slurry; meanwhile, 4, 4 '-diaminodiphenyl ether reacts with pyromellitic dianhydride to prepare a polyamide acid solution. And mixing the two materials, forming a layered structure through vertical and horizontal temperature gradients by adopting a bidirectional freezing casting technology, and freezing by liquid nitrogen to obtain the aerogel in oriented arrangement. And performing hot pressing and step-by-step thermal imidization treatment to obtain the heat-conducting composite film. According to the method, the highly-oriented arrangement of boron nitride nanosheets is constructed through bidirectional freezing casting, and the composite film has excellent heat-conducting property and keeps good mechanical strength and flexibility in combination with the surface modification effect. The process is simple and controllable, and is suitable for the fields of flexible electronics, 5G heat dissipation, battery thermal management and the like.

The invention provides a recovery method of a waste ternary lithium battery, and belongs to the technical field of waste electrode material recovery. According to the method, the PVDF binder is dissolved in the mixed solvent composed of N, N-dimethylacetamide and triethylamine, then the modified quaternary ammonium salt is prepared based on the mixed solvent and applied to the eutectic solvent, and meanwhile, the fluorine-containing nickel cobalt manganese salt is obtained by utilizing the quaternary ammonium salt, so that the positive electrode regenerated material recycled from the waste ternary lithium battery shows excellent electrochemical performance.

The invention belongs to the field of lead compound library construction in medical research, and particularly relates to a construction method of an On-DNA aryl sulfide structure compound, which comprises the step of reacting On-DNA aryl mercaptan or On-DNA aryl thiophenol with a halide to generate the On-DNA aryl sulfide structure compound, the step is a photocatalytic reaction at room temperature, and the on-DNA aryl sulfide structure compound is obtained. The wavelength of the light source for reaction is 315-455 nanometers, the solvent for reaction comprises an organic solvent and water, and the organic solvent in the solvent is one or more of dimethyl sulfoxide, N, N-dimethylformamide and dimethylacetamide. The oligomeric nucleic acid-aryl sulfide structure compound with rich structures can be obtained at a time under the reaction conditions, the reaction conditions are wide in adaptability and obviously superior to the prior art, the oligomeric nucleic acid-aryl sulfide structure compound is suitable for being used as a reaction raw material of a first-stage or second-stage halide, and the conversion rate of a third-stage iodide can also reach 90% or above.

The present invention belongs to the technical field of fabric color fixing agents and provides a novel acidic color fixing agent free of bisphenol S and a preparation method thereof; the acidic color fixing agent is composed of the following components in parts by weight: 15-25 parts of water, 10-15 parts of phenol, 15-25 parts of dimethylacetamide, 2-5 parts of sodium sulfite, 10-15 parts of acetic acid, 5-7 parts of concentrated sulfuric acid, 15-20 parts of acrylic acid, 2-5 parts of ethylene glycol dimethyl ether, and 1-3 parts of sorbitol; the preparation method comprises the following steps: mixing a formula amount of phenol, dimethylacetamide, acrylic acid, acetic acid, and sodium sulfite, heating, adding concentrated sulfuric acid to react, cooling, adding a formula amount of water, and adding a formula amount of ethylene glycol dimethyl ether and sorbitol to obtain the product. Compared with the prior art, the present invention does not contain bisphenol S, has a good color fixing effect, can effectively improve various fastnesses such as water fastness, perspiration fastness, and seawater resistance, has little effect on the color change of the fabric after treatment, and has good tolerance to hardness ions.

The invention discloses a heat-conducting aramid insulation paper-based material as well as a preparation method and application thereof. The preparation method of the heat-conducting aramid insulation paper-based material comprises the following steps: (1) introducing amino groups on the surfaces of boron nitride nanosheets to obtain aminated boron nitride nanosheets; (2) dissolving m-phenylenediamine in N, N-dimethylacetamide, then adding m-phthaloyl dichloride, then adding the amino boron nitride nanosheets, and carrying out a reaction to obtain a heat-conducting aramid polymer solution; (3) performing wet spinning on the heat-conducting aramid polymer solution to obtain heat-conducting aramid fibers; and (4) mixing the heat-conducting aramid fiber and the fibrid, and manufacturing the heat-conducting aramid insulation paper-based material. The amino boron nitride nanosheets are connected with amide groups among aramid macromolecules, so that the interfacial compatibility of the filler and the base material in the paper material is improved, and the strength and the heat-conducting property of the paper material are improved.

The invention provides a LiCl / cellulose nanofiber composite membrane, a preparation method thereof and an ionic conductive humidity sensor, and belongs to the technical field of biomass nanomaterials. According to the method, cellulose pulp is used as a raw material, cellulose is dissolved in an N, N-dimethylacetamide (DMAc) / lithium chloride (LiCl) solvent system, DMAc is volatilized into air in the electrostatic spinning process, and LiCl is reserved in cellulose nanofibers. In this way, LiCl / cellulose nanofiber films with different LiCl contents can be prepared. The prepared humidity sensor has the advantages of higher sensitivity, wider detection range and short response / recovery time, and can be used in the fields of human respiration monitoring, non-contact humidity testing and the like. The invention provides a new thought for constructing a novel cellulose-based humidity sensor.

The invention relates to the field of lithium ion battery adhesives, in particular to a PVDF adhesive power improving accelerant and a preparation method thereof. The accelerant comprises modified polyacrylonitrile, modified polyimide and a high-efficiency solvent, the mass ratio of the modified polyacrylonitrile to the modified polyimide is 1: (0.2-2), and the high-efficiency solvent is selected from at least one of N, N-dimethylacetamide, N-methyl pyrrolidone and N, N-dimethylformamide. According to the accelerant prepared by the invention, the advantages of modified polyacrylonitrile (PAN) and modified polyimide (PI) are ingeniously combined, through scientific proportioning and a compounding technology, the adhesive force to PVDF is remarkably improved, meanwhile, the dosage of PVDF in a lithium ion battery is effectively reduced, and the energy density and the cycling stability of the battery are further improved.

The invention discloses an oxidation-resistant meta-aramid fiber and a preparation method thereof, and the preparation method comprises the following steps: step 1, carboxylated carbon nanotubes and modified copolyamide react, then modified meta-aramid powder is added, and composite reinforced nanopowder is obtained after drying; step 2, mixing the composite reinforced nano powder, poly (m-phenylene isophthalamide), hydrogen chloride and N, N-dimethylacetamide to prepare a composite meta-aramid spinning solution, and preparing oxidation-resistant meta-aramid fibers by adopting a wet spinning process; the meta-aramid fiber is doped with the composite reinforced nanopowder, so that the performance of the oxidation-resistant meta-aramid fiber is enhanced by the composite reinforced nanopowder modified by the carbon nanotubes, and the oxidation resistance of the oxidation-resistant meta-aramid fiber is improved by using the oxidation resistance of the carbon nanotubes; meanwhile, the mechanical strength of the oxidation-resistant meta-aramid fiber is also improved due to the physical properties of the carbon nanotubes, and the obtained oxidation-resistant meta-aramid fiber is good in thermo-oxidative aging resistance.

The invention discloses a compound fluralana external preparation for dogs, a preparation method and application, belongs to the technical field of veterinary drugs, and solves the problems that an existing preparation is poor in skin surface permeability, a solvent is easy to volatilize, and use experience and drug effect exertion are influenced. The preparation is prepared from the following raw materials: fluralana, moxidectin, ethyl butylacetamidopropionate and N, N-dimethylformamide. The preparation method comprises the following steps: adding N, N-dimethylacetamide, acetone, an auxiliary adjuvant, a transdermal penetration enhancer, an antioxidant and a surface film-forming agent; according to the invention, the combination of the fluralab and the moxidectin can play a synergistic effect and expand an anti-parasitic spectrum so as to achieve an internal and external driving effect; both the fluralab and the moxidectin belong to high-fat-soluble substances, parasites can be quickly repelled and killed by adding novel adjuvant natural parasite expelling ingredients, and meanwhile, the skin permeability can be improved by adding the efficient transdermal penetration enhancer, and the risk that medicine residues are licked by pets is reduced.

The invention discloses a preparation method and an application of a flower-like Mg-Al LDH (layered double hydroxide) modified polydimethylsiloxane / polyethersulfone composite membrane. The preparation method comprises the following steps: dissolving polyethersulfone in N, N-dimethylacetamide, scraping a membrane, and soaking the membrane in deionized water; the preparation method comprises the following steps: dissolving PDMS in an isooctane solvent, adding LDH with different concentrations, continuously stirring until LDH is completely dispersed, adding PDMS, a cross-linking agent and a catalyst into the cross-linking agent and the catalyst according to a mass ratio of 10: 2: 1, and preparing the coating by adopting a wet film dip-coating method. And coating to obtain the modified composite membrane. The method is mainly applied to preparation of gas-liquid two-phase gas separation so as to obtain a composite membrane material with high CO2 / O2 selectivity and high gas permeability. Meanwhile, the method is simple in preparation process, the raw materials are cheap and easy to obtain, the LDH modified composite membrane can effectively improve the gas permeability and selectivity of the material, and a new preparation thought is provided for preparing a good CO2 gas separation membrane.

The invention discloses a method for rapidly synthesizing MOFs (Metal-Organic Frameworks) derived sulfide CoS / Co-MOF (Metal-Organic Frameworks). The synthesis method comprises the following steps that a Co-MOF precursor is obtained through a solvothermal method, then the Co-MOF precursor is mixed with thioacetamide, absolute ethyl alcohol and dimethylacetamide, and the MOFs derivative sulfide CoS / Co-MOF composite material is obtained through the solvothermal method. Compared with a traditional pyrolysis method, the method is easy and convenient to operate and mild in condition, the reaction time is greatly shortened, and in addition, a series of electrochemical tests (LSV, CV, EIS and CP) prove that the CoS / Co-MOF composite material shows excellent OER performance and is an excellent OER catalyst.

The invention provides a preparation method of modified heterocyclic aramid fiber and fiber prepared by the method. The preparation method comprises the following steps: S1, dispersing graphene oxide in an N, N-dimethylacetamide solvent to form a dispersion liquid; s2, adding the dispersion liquid into a polymerization reaction system before polymerization of an aramid fiber III monomer to form a composite spinning solution; wherein C-O / C = O in the graphene oxide is 2-5. The graphene oxide with high C-O content is adopted, the dispersion liquid is formed by taking the N, N-dimethylacetamide as the solvent, and the graphene oxide is not easy to agglomerate in the composite solvent and is convenient to store; c-O in the graphene oxide is easier to partially reduce in the fiber forming process, the reduced graphene oxide is obtained and is more stable compared with the graphene oxide, and stable storage of subsequent fibers is guaranteed. Meanwhile, the graphene oxide is added, so that fiber fibrillation can be prevented, and the compression performance, the tensile strength and the corrosion resistance are greatly improved.