497 results about "Dimethyl formamide" patented technology

The invention discloses a CO2 trapping absorbent which comprises 20%-50% of proton type ionic liquid, 20%-50% of a phase conversion driving agent and 20%-40% of water, and the phase inversion driving agent is one or a mixture of more of N, N-dimethyl formamide, N-methyl pyrrolidone, pentamethyldiethylenetriamine, tetramethylethylenediamine, tetramethylethylenediamine, tetramethylenediamine, tetramethylethylenediamine and dimethyl piperazine, and the phase inversion driving agent is one or a mixture of more of N, N-dimethyl formamide, N-methyl pyrrolidone, pentamethyldiethylenetriamine, tetramethylethylenediamine, tetramethylethylenediamine and dimethyl piperazine. The absorbent disclosed by the invention has the outstanding advantages of low viscosity, high absorption rate, high regeneration efficiency, high circulation capacity and low regeneration energy consumption, and has a good application prospect.

The invention discloses a carbon fiber surface treatment process, which belongs to the technical field of organic synthesis, and comprises the following steps: S1, taking melamine, adding into tetrahydrofuran, adding carboxylated carbon fiber and a condensing agent, heating to 50-60 DEG C, stirring for 3-4 hours, washing, and drying to obtain melamine modified carbon fiber; s2, adding nano silicon dioxide into DMF (Dimethyl Formamide), performing ultrasonic treatment, adding a silane coupling agent KH550 and succinic anhydride, stirring for 3-5 hours, washing and drying to obtain modified silicon dioxide; and S3, adding the modified silicon dioxide into DMF, adding the melamine modified carbon fiber and a condensing agent, heating to 90-100 DEG C, stirring for 4-5 hours, washing, and drying to obtain the surface-treated carbon fiber. The silane coupling agent KH550 and butanedioic anhydride are used for carboxylation modification of nano silicon dioxide, melamine is used as a coupling agent, nano silicon dioxide is grafted on carbon fibers, surface defects on the surfaces of the carbon fibers can be filled, and therefore the mechanical performance of the carbon fibers is improved.

The invention relates to the technical field of additive processing, and particularly discloses an additive for mixing raw materials of a carbon-based ceramic friction material and a preparation method of the additive. The preparation method comprises the following steps: mixing a treated multi-walled carbon nanotube with a sodium borate and ethylenediamine aqueous solution, calcining at high temperature to obtain a boron nitride-loaded multi-walled carbon nanotube, and combining with a cross-linking agent to prepare a functional filler; adding ethylenediamine, 3, 3-diphenylpropylamine and palladium acetate into the prepared N-methyl pyrrolidone and polyether-ether-ketone solution to obtain modified polyether-ether-ketone; and mixing the modified polyether-ether-ketone, a functional filler, an antioxidant, a lubricant and N, N-dimethylformamide to obtain the additive for mixing the raw materials of the carbon-based ceramic friction material. The additive provided by the invention has good compatibility, can significantly improve the processing molding performance and mechanical strength of the friction material, and effectively reduces the wear rate.

The invention relates to the technical field of microfiber material preparation, in particular to a preparation method of an insulating flame-retardant automotive interior microfiber material, which comprises the following steps: spinning sea-island fibers by taking PA6 as an island component and LDPE as a sea component and matching with master batches; performing opening, carding, lapping, pre-needling by a pre-needling machine and needling by a needling machine on the sea-island fibers to prepare non-woven fabric; carrying out heat setting on the non-woven fabric; preparing insulating flame-retardant polyurethane slurry, infiltrating the heat-set non-woven fabric to enable the non-woven fabric to be fully impregnated, and then feeding the non-woven fabric into an aqueous solution of dimethylformamide to be subjected to water bath curing, so as to prepare a semi-finished synthetic leather product; extracting sea components in the sea-island fibers from the synthetic leather semi-finished product by adopting a stripping process; and drying the reduced superfine fiber synthetic leather base cloth, immersing the base cloth into a softening agent aqueous solution, and then carrying out drying and leather rubbing treatment to obtain the insulating flame-retardant superfine fiber leather. The product provided by the invention is used for external protection of an intelligent auxiliary driving steering wheel sensing layer, and the resistance of the microfiber material reaches 1.2 megohm or above.

The invention relates to a preparation method of a terephthalic acid and 2-methylimidazole organic framework catalyst, and relates to a preparation method of a high polymer material catalyst, the preparation method comprises the following steps: weighing C6H4 (COOH) 2 and 2-methylimidazole, dissolving C6H4 (COOH) 2 and C4H6N2 in N, N-dimethylformamide (DMF), weighing zinc nitrate hexahydrate (Zn (NO3) 2.6 H2O), dissolving in DMF, and preparing into a solution; the preparation method comprises the following steps: mixing a C6H4 (COOH) 2 solution and a C4H6N2 solution in proportion, and uniformly stirring; slowly adding the mixed ligand solution into a mixed solution of zinc nitrate hexahydrate (Zn (NO). 6HO) dissolved in DMF (Dimethyl Formamide), and transferring into a high-pressure reaction kettle for reaction; after cooling, centrifugally separating to obtain a white solid product, washing with methanol, and drying to obtain the Zn-MOF catalyst. The Zn-MOF catalyst provided by the invention can be widely applied to polyester synthesis, esterification reaction and other organic catalytic reactions, and especially has significant advantages in PBAT synthesis.

The invention belongs to the technical field of thermal management materials, and provides aerogel fibers of a three-dimensional porous structure and a preparation method and application of the aerogel fibers. The preparation method comprises the following steps: preparing a polyurethane spinning solution by taking N, N-dimethylformamide as a solvent; then carrying out wet spinning on the polyurethane spinning solution to obtain wet gel state fibers; and immersing the wet gel-state fiber into an organic solvent for solvent exchange, and drying after the solvent exchange is completed to obtain the aerogel fiber. The method is simple, low in cost and low in equipment requirement, efficient and continuous production of the aerogel fibers can be achieved, different spinning solutions can be adopted for preparing the aerogel fibers of different pore structures, meanwhile, the problem that the porous structures of the aerogel fibers are prone to collapsing when the aerogel fibers are dried at normal pressure is solved, and the aerogel fibers are suitable for large-scale production. The aerogel fiber with the three-dimensional porous structure is stable in porous structure, not prone to collapse, excellent in mechanical property and excellent in heat preservation and heat insulation performance.

The invention provides a preparation method of a nitrogen-doped non-noble metal catalyst. The preparation method comprises the following steps: mixing ethylenediaminetetraacetic acid, triethylamine, a nickel source and a cobalt source in a DMF (Dimethyl Formamide) solution, and aging; and centrifuging, drying and calcining at high temperature to obtain the nitrogen-doped non-noble metal catalyst with the average particle size of 10-50nm. According to the preparation method of the nitrogen-doped non-noble metal catalyst provided by the invention, the prepared nitrogen-doped non-noble metal catalyst has the following beneficial effects that the complex metal ions are adopted as the precursor, the nitrogen-doped non-noble metal nanoparticles are prepared by a high-temperature calcination method, and the catalyst obtained by the method has the characteristics of high dispersity, high catalytic activity and high catalytic activity. The preparation method is simple and good in repeatability; and the synthesis steps are simple, and the cost is low. The nitrogen element is introduced, so that the deamination reaction can be effectively inhibited, and the yield of m-phenylenediamine is improved. When the prepared catalyst is applied to an isophthalonitrile hydrogenation process, extremely high yield of m-phenylenediamine can be maintained under mild reaction conditions.

The invention relates to the field of MOF-based flexible thermoelectric materials, and discloses n-type MOF-based high-performance thermoelectric foam with ductility and a preparation method and application thereof, and the method comprises the following steps: dissolving 1, 3, 5-trimesic acid and copper acetate in a mixed solution of N, N-dimethylformamide, ethanol and deionized water to prepare a precursor solution; soaking foamed nickel in the precursor solution for hydrothermal reaction, then taking out, cleaning and drying to obtain a foamed nickel material with nickel-copper MOF uniformly grown on the surface; and soaking the foamed nickel material in a mixed solution of polyaniline and DMF (Dimethyl Formamide) so as to graft a conductive polymer on the surface and pore channels of the nickel-copper MOF, thereby obtaining the high-performance thermoelectric foam with ductility. The n-type MOF-based thermoelectric foam prepared by the invention has excellent ductility and thermoelectric performance, and also has the characteristics of metal plasticity, efficient thermoelectric performance and sensitivity to temperature change. The excellent thermoelectric performance and wide application scene of the material are far better than those of the currently reported n-type MOF-based thermoelectric material.

The invention belongs to the technical field of electro-catalysis full water splitting, and discloses a nickel-based self-supporting hydrogen evolution electrode and a preparation method and application thereof.The preparation method comprises the steps that nickel chloride hexahydrate and terephthalic acid are dissolved in N, N-dimethylformamide, the concentration of the nickel chloride hexahydrate is controlled to be 0.1-0.15 mol / L, the concentration of the terephthalic acid is controlled to be 0.1-0.15 mol / L, the nickel chloride hexahydrate and the terephthalic acid are stirred to be uniform, ultrasonic treatment is conducted, and an electrolyte is obtained; the pretreated foamed nickel is immersed in the electrolyte to serve as a working electrode, a platinum net serves as a counter electrode, an Ag / AgCl electrode is adopted as a reference electrode, current of-10 mA to-20 mA is applied for deposition for 1.5-2.5 h, and the nickel-based self-supporting hydrogen evolution electrode is obtained after electro-deposition and cleaning and drying are conducted. The nickel-based self-supporting catalytic material prepared by the invention fully exposes active sites, has high catalytic performance, has a good application prospect in the technical field of electro-catalytic materials, and is expected to improve energy and environment problems.

The invention discloses a preparation method of an optical OCA (Optical Clear Adhesive) and application of the optical OCA in a mobile phone folding screen, and relates to the technical field of optical cement, the optical OCA is prepared from the following raw materials in parts by weight: 50 parts of acrylate prepolymers, 2-4 parts of 3-allyl-2-mercapto-3H-quinazoline-4-ketone, 1-3 parts of diallyl disulfide, 1-3 parts of 3-[N, N-dimethyl formamide], 1-3 parts of 2, 3, 5-trimethyl-1, 3-pentanediol monoisobutyronitrile, 1-3 parts of 2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3 The preparation method comprises the following steps: adding 3-5 parts of N, N-dimethyl-[2-(2-methylpropane-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt, 1-3 parts of allyl succinimido carbonate, 2-4 parts of dicyclopentene methacrylate, 1-3 parts of 1, 3, 5-triacryloyl hexahydro-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- The invention relates to a graphene quantum dot photoinitiator which is prepared from the following components in parts by weight: 1-3 parts of 1, 3, 5-triazine, 0.8-1.2 parts of a photoinitiator, 1-3 parts of an aziridine cross-linking agent, 1-3 parts of graphene quantum dots, 0.8-1.2 parts of a coupling agent and 40-50 parts of a diluent. The optical OCA adhesive is high in light transmittance and bonding strength, good in weather resistance and excellent in folding resistance.

The invention relates to the technical field of water treatment, and particularly discloses a seawater desalination reverse osmosis membrane and a preparation method thereof. The sea water desalination reverse osmosis membrane comprises a base membrane layer and a separation layer, the base membrane layer comprises a base layer and a porous support layer, and the sea water desalination reverse osmosis membrane is characterized in that the separation layer comprises the following raw materials in parts by weight: 15-20 parts of bis-2-6-N, N-dimethyl formamide, 1-5 parts of sodium hydroxide and 1-5 parts of sodium hydroxide; the environment-friendly anti-corrosion coating is prepared from the following components in parts by weight: 20 to 30 parts of N, N-(2-ethoxyl) diaminotoluene, 10 to 15 parts of triethylamine, 20 to 30 parts of camphorsulfonic acid, 10 to 15 parts of trifluoroacetic anhydride, 0.5 to 1.5 parts of sodium dodecyl sulfate, 10.5 to 20.5 parts of modified microcapsules, 0.5 to 1.5 parts of trimesoyl chloride and 150 to 180 parts of isoparaffin solvent. The reverse osmosis membrane for seawater desalination can be used in the field of seawater desalination, and has the advantages of high chemical stability, large water flux and excellent durability.

The invention relates to the field of novel display material quantum dot materials, and discloses a preparation method of a carbon dot-based anti-blue light film. The preparation method comprises the following steps: (1) weighing perylene and PTCDA or perylene and propylene diamine as reaction precursors according to a molar ratio of perylene to PTCDA / propylene diamine of (1-5): 1; (2) adding an ethanol-sulfuric acid solution or DMF (Dimethyl Formamide) into the reaction precursor, and carrying out solvothermal reaction in a hydrothermal reaction kettle; the perylene: ethanol sulfuric acid solution or DMF = 1 mmol: (3-20) mL; (3) after the solvothermal reaction is completed, filtering, centrifuging and dialyzing a reaction solution, and finally drying to obtain the carbon dots; and (4) mixing and dispersing polystyrene and the carbon dots in toluene, and spin-coating to prepare the carbon dot-based anti-blue light film. The prepared carbon dots can be used for preparing an anti-blue-light film at a low doping ratio, CIE coordinates do not shift, and the color is not distorted.

The invention relates to a Fe3C-Ru / NFs catalyst as well as a preparation method and application thereof. Wherein the Fe3C-Ru / NFs catalyst comprises carbon nanofibers NFs, and Fe3C and sub-nanoscale Ru particles which are loaded on the carbon nanofibers NFs, and the average particle size of the Ru particles is less than 3nm. The preparation method of the catalyst comprises the following steps: dissolving PVP (Polyvinyl Pyrrolidone), an iron source and a ruthenium source in a mixed solvent of DMF (Dimethyl Formamide) and ethanol to obtain a precursor solution; and preparing FeRu / PVP nanofibers from the precursor solution through an electrostatic spinning method, and then carrying out pre-oxidation and high-temperature carbonization to obtain the Fe3C-Ru / NFs catalyst. According to the invention, Fe3C and sub-nanoscale Ru particles are highly dispersed on the carbon nanofibers, and the Fe3C particles enable the electronic environment of Ru sites to be changed and to be in an electron-deficient state, so that the generation of a catalytic reaction is facilitated, and the catalyst has extremely high electro-catalysis full-water-splitting performance and stability.

The invention belongs to the technical field of all-vanadium redox flow battery diaphragms, and particularly discloses a sulfonated polyetheretherketone / polyaniline composite membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing polyetheretherketone and concentrated sulfuric acid, and carrying out water bath heating reaction to prepare a sulfonated polyetheretherketone solid; molybdenum disulfide and methylbenzene are mixed and subjected to ultrasonic treatment, 1, 3-propane sultone is added, oil bath heating is conducted, and sulfonated molybdenum disulfide powder is prepared; the preparation method comprises the following steps: mixing and stirring sulfonated molybdenum disulfide powder, polyaniline and a DMF (Dimethyl Formamide) solution, performing ultrasonic treatment, adding a sulfonated polyether-ether-ketone solid, stirring to obtain membrane casting slurry, coating a glass plate with the membrane casting slurry, drying to form a membrane, and soaking the membrane in a sulfuric acid solution and deionized water in sequence to obtain the sulfonated polyether-ether-ketone / polyaniline composite membrane. The invention discloses a sulfonated polyetheretherketone / polyaniline composite membrane as well as a preparation method and application thereof. The sulfonated polyetheretherketone / polyaniline composite membrane has high proton conductivity, can maintain relatively low vanadium ion permeability and can improve the electrochemical performance of an all-vanadium redox flow battery.

The invention discloses a perovskite precursor solution, a perovskite solar cell and a preparation method of the perovskite solar cell. The perovskite precursor solution provided by the invention contains a perovskite precursor solute, a perovskite precursor solvent and an additive, the perovskite precursor solute contains lead halide, and further contains at least one of tin halide, formamidine halide, methylamine halide, cesium halide, dimethylamine halide and guanidine halide; the perovskite precursor solvent contains at least one of N, N-dimethyl formamide, dimethyl sulfoxide, N-methyl pyrrolidone, 2-methoxyethanol, valerolactone and acetonitrile, and the perovskite precursor solvent contains at least one of N, N-dimethyl formamide, dimethyl sulfoxide, N-methyl pyrrolidone, 2-methoxyethanol, valerolactone and acetonitrile; the additive contains an organic salt of trifluoromethyl acid. The opening voltage loss is reduced, the filling factor and the photoelectric conversion efficiency of the battery are improved, the precipitation of lead iodide is reduced in the crystallization annealing process, the volatilization of organic cations is inhibited, the non-uniform crystallization is improved, and the stability of the battery is improved.

The invention discloses a Ni3InC0.5 wave-absorbing material and a preparation method thereof, and the preparation method comprises the following steps: (1) dispersing Ni (CH3COO) 2.4 H2O and In (CH3COO) 2.6 H2O into N, N-dimethylformamide (DMF), and magnetically stirring to obtain a liquid A; (2) dispersing terephthalic acid (PTA) and triethylamine (TEA) into DMF, and magnetically stirring to obtain liquid B; (3) pouring the liquid B into the liquid A, and continuously stirring to obtain a Ni3InC0.5 precursor solution; (4) putting the solution obtained in the step (3) into a circulating water suction filter for suction filtration to obtain a gelatinous sample; and (5) taking a sample obtained in the step (4), calcining the sample in a nitrogen atmosphere, and naturally cooling the sample to room temperature to obtain Ni3InC0.5. The method has the characteristics of simple process and low cost, and the material is applied to the field of wave absorption for the first time.

The invention relates to the technical field of plastic materials, in particular to a high-strength modified plastic product and a preparation process thereof. The preparation method comprises the following steps: uniformly mixing modified carbon fibers, a flame retardant, a photoinitiator and N, N-dimethylformamide, and performing ultraviolet irradiation, washing and drying to obtain a compound; uniformly mixing polyphthalamide, the compound, polyethylene wax, an antioxidant and a nucleating agent to obtain a blend; and carrying out melt extrusion, granulation and injection molding on the blend in a twin-screw extruder to obtain the modified plastic product. The modified plastic product prepared by the invention not only has excellent mechanical properties, but also has excellent flame retardance, and the use safety and durability of the modified plastic product are effectively improved.

The invention belongs to the field of novel display material quantum dot materials, and discloses a carbon dot with a dark blue light emission characteristic, and a preparation method and application thereof. The preparation method comprises the following steps: (1) weighing perylene and PTCDA or perylene and propylene diamine as reaction precursors according to a molar ratio of perylene to PTCDA / propylene diamine of (1-5): 1; (2) adding an ethanol-sulfuric acid solution or DMF (Dimethyl Formamide) into the reaction precursor, and carrying out solvothermal reaction in a hydrothermal reaction kettle; and (3) after the solvothermal reaction is completed, filtering, centrifuging and dialyzing the reaction solution, and finally drying to obtain the carbon dots. The carbon dot with the dark blue light emission characteristic is applied to a dark blue light electroluminescent diode. The carbon dots developed by the invention have a dark blue light emission characteristic (the emission peak value is less than or equal to 465 nm), can be applied to dark blue light-emitting diodes, have a wide application prospect, are simple in preparation process and low in cost, and are a convenient and environment-friendly method for synthesizing the carbon dots on a large scale.

The invention relates to a platinum-zinc alloy supported nitrogen-doped porous multi-layer carbon material and preparation and application thereof, the carbon material takes a rod-like graded porous carbon nanomaterial as a carrier, and platinum-zinc alloy particles and zinc monatomic are jointly supported on the surface of the carrier; the preparation method comprises the following steps: S1, adding zinc acetate and hexadecyl trimethyl ammonium bromide into DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding into a polyacrylonitrile solution, and stirring; s2, performing electrostatic spinning on the obtained spinning precursor solution; s3, adding the obtained nanofiber into a zinc acetate dihydrate solution, then adding a dimethylimidazole solution, carrying out hydrothermal reaction, soaking the obtained product in a chloroplatinic acid methanol solution, and then carrying out freeze drying; and S4, heating carbonization is carried out under the protection of an inert atmosphere, then annealing and cooling are carried out, and the PtZn-Zn-N4-HPCNFs material is obtained. Compared with the prior art, the catalytic performance and the like in the reaction processes of oxygen reduction reaction (ORR), chlorine evolution reaction (CER) and the like can be effectively improved.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing 5-methylfurfural by using 2-methylfuran. The special solid acid catalyst is used for replacing traditional phosphorus oxychloride, hydrogen chloride and phosphorus-containing wastewater are eliminated from the source, and the sulfolane is used for replacing DMF (Dimethyl Formamide), so that solvent residues in the product are reduced. The solid catalyst SO4 < 2-> is modified to form a strong Bronsted acid site (-SO3H) which cooperates with Ce < 3 + > / Ce < 4 + > redox to inhibit carbon deposition, selectively activate 2-methylfuran alpha-C and inhibit side reactions, so that the selectivity and yield of a target product are improved. Na2CO3 neutralization is replaced by electrochemical neutralization, salt slag solid waste is eliminated, and environmental pollution is reduced. After the organic phase is dried and dewatered through a molecular sieve, most of the solvent is removed through rotary evaporation, and the residual crude product is subjected to centrifugal molecular distillation, so that unreacted raw materials and trace impurities are effectively removed, and the product purity is remarkably improved.

The invention provides a concrete water reducing agent and a preparation method thereof, and belongs to the technical field of water reducing agents. Adding the modified chitin, 1-vinyl-3-butylimidazolium trifluoromethanesulfonate, a silane coupling agent with double bonds, methacrylic acid, trans-butenedioic acid and an initiator into dimethylformamide, heating and stirring for reaction, removing methylbenzene under reduced pressure, and performing alkali washing and alcohol washing to obtain the concrete water reducing agent. The modified chitin is prepared by modifying chitin modified by sodium sulfonate and acrylic acid with tannic acid. Modified chitin, 1-vinyl-3-butylimidazolium trifluoromethanesulfonate, a silane coupling agent with double bonds, methacrylic acid and trans-butenedioic acid are copolymerized to prepare the polycarboxylate superplasticizer, molecules of the polycarboxylate superplasticizer are of a comb-shaped structure, a main chain of the polycarboxylate superplasticizer is provided with a plurality of active groups with high polarity, and a side chain of the polycarboxylate superplasticizer is provided with hydrophilic active groups. The water-reducing agent has the characteristics of low doping amount, high water-reducing rate, high reinforcing effect, high plasticity retaining property and volume stability, and has wide application prospects.

The invention relates to a phase change energy storage fiber with ultraviolet shielding and heat regulation and control functions and a preparation method of the phase change energy storage fiber. The preparation method comprises the following steps: dissolving thermoplastic polyurethane in N, N-dimethylformamide to form a spinning mother solution; the preparation method comprises the following steps: firstly, adding nano titanium dioxide and uniformly dispersing, then adding a silicon dioxide shell layer-octadecane core layer phase change microcapsule, and stirring and ultrasonically defoaming to obtain a uniform composite spinning solution; extruding the spinning solution into a coagulating bath consisting of isopropanol and deionized water through an injection pump, and coagulating and forming to obtain nascent fibers; finally, washing, solvent replacement, tension setting and drying treatment are conducted, and compared with the prior art, the obtained fiber has efficient ultraviolet shielding performance and remarkable phase change energy storage capacity and has wide application prospects in the fields of intelligent temperature adjusting textiles, outdoor protective garments, building heat management and the like.

The invention discloses a photo-thermal response self-healing coating and a preparation method thereof, and belongs to the technical field of anticorrosive coatings. The preparation method comprises the following steps: dissolving an EVA copolymer in trichloromethane, dropwise adding into an aqueous solution of lauryl sodium sulfate, and stirring until the trichloromethane is evaporated to obtain EVA microspheres; the preparation method comprises the following steps: dispersing MXene in water, and dispersing EVA microspheres in DMF (Dimethyl Formamide); mixing and stirring the two materials to obtain an MXene-coated EVA material; the preparation method comprises the following steps: mixing water-based resin, PPGDGE and a curing agent, adding an MXene-coated EVA material, coating, and curing to obtain the photo-thermal response self-healing coating. Under near-infrared radiation, the photo-thermal response self-healing coating can be rapidly heated, the shape memory process of a coating matrix is started, the EVA material is subjected to phase change to fill the damaged part of the coating, and the MXene nanosheet prolongs the permeation time of electrolyte, so that the coating has efficient damage healing capacity and an anti-corrosion effect.

The invention discloses an agent for delaying development of drug resistance of brown planthopper and application thereof.The agent comprises 96.6% of pymetrozine original medicine and 12% of Zhongshengmycin original medicine, and the 96.6% of pymetrozine original medicine and the 12% of Zhongshengmycin original medicine are prepared through an organic solvent N, N-dimethyl formamide. The preparation method comprises the following steps: dissolving N, N-dimethylformamide analytically pure (DMF), diluting with distilled water to obtain a pymetrozine solution with the LC50 value of 3.80 mg / L and a zhongshengmycin solution with the LC50 value of 152.61 mg / L, and mixing the pymetrozine solution with the LC50 value of 3.80 mg / L and the zhongshengmycin solution with the LC50 value of 152.61 mg / L according to a volume ratio to prepare the medicament. The invention aims to provide an agent for preventing and treating brown planthopper and application of the agent for delaying development of drug resistance of brown planthopper, aiming at the defect that the chemical prevention and treatment effect is obviously reduced due to drug resistance of brown planthopper to conventional chemical insecticides.

The invention discloses a degradable nanocellulose sustained-release drug-loaded film and a preparation method thereof, and belongs to the technical field of drug functional materials. The preparation method comprises the following steps: mixing and stirring microcrystalline cellulose and 64wt% sulfuric acid solution, centrifuging, dialyzing to be neutral, and freeze-drying to obtain CNCs; cNCs, NaIO4 and water are mixed and then subjected to a light-shielding reaction, ethanol precipitation is added, dialysis purification is conducted, freeze drying is conducted, and formylation modified CNCs are obtained; mixing and stirring the aldehyde modified CNCs, sericin, polyvinyl alcohol, water and a target drug to obtain a core layer solution; dissolving a polylactic acid-glycolic acid copolymer into a mixed solution of chloroform and DMF (Dimethyl Formamide) to obtain a shell solution; the core layer solution and the shell layer solution are subjected to coaxial electrostatic spinning forming to obtain the drug-loaded fiber, then the drug-loaded fiber is subjected to biomimetic mineralization surface modification to obtain the degradable nanocellulose sustained-release drug-loaded film, the drug loading rate is increased, the mechanical property of the drug-loaded film is improved, and the sustained-release and release-controllable effects are achieved.

The invention discloses a synthesis method of a felinone intermediate, and relates to the technical field of medicine synthesis. The synthesis method comprises the following steps: firstly, taking a 500ml four-neck flask, adding 200ml of dichloromethane, adding 40g of 3-hydroxypropionitrile, finally adding 5g of a DMAP solid material, and stirring for 1 hour; continuously dropwise adding 50 g of ketene dimer, and after temperature-controlled dropwise adding is completed, carrying out heat preservation reaction for 2 hours to obtain a reaction solution; and taking the reaction liquid, washing with 200ml of saturated saline solution, preserving heat, taking the lower-layer material, washing with 200ml of purified water, preserving heat, taking the lower-layer material, finally washing with 200ml of saturated saline solution, taking the lower-layer material, distilling, and desolventizing to obtain the target product. The preparation method comprises the following steps: putting 40g of a target product and 200ml of DMF (Dimethyl Formamide) into a 500ml four-mouth flask, stirring, then adding 50g of 4-cyano-2-methoxybenzaldehyde into a constant-pressure dropping funnel and the like; the synthesis method is stable in reaction, low in raw material price, reasonable in synthesis route, basically free of by-products in the synthesis process, and high in target product purity.

The invention discloses modified bamboo charcoal powder, a modified bamboo charcoal powder / polyacrylonitrile composite film and a preparation method thereof, and relates to the technical field of polymer composite films. The preparation method comprises the following steps: firstly, carrying out ball milling treatment on bamboo charcoal fibers to prepare superfine bamboo charcoal powder with nanoscale particle size, cleaning, oxidizing and modifying the superfine bamboo charcoal powder to obtain modified bamboo charcoal powder, and then jointly dispersing the modified bamboo charcoal powder and PAN in a DMF (Dimethyl Formamide) solvent, stirring and dissolving to prepare a uniform membrane casting solution. A wet film is formed on a glass substrate in a film coating mode, and the superfine modified bamboo charcoal powder / PAN composite film is finally obtained through the steps of solidification, cleaning and drying. The film has the good film-forming property of PAN and the excellent adsorption property of bamboo charcoal, and shows good mechanical strength and high thermal stability and adsorption efficiency. The method is simple in process and wide in material source, has a good industrialization prospect, and is suitable for the fields of environment-friendly filtering materials, energy storage and high-temperature-resistant materials and the like.

The invention relates to an efficient heat shrink tube preparation method and equipment thereof. FEP granules and modified CaSi2 are fed into an extruder to be extruded, and an FEP pipe is obtained; placing the FEP pipe in an expansion box, taking out the FEP pipe after the pressure in the FEP pipe and the pressure in the expansion box reach expansion pressure and are stabilized for a period of time and the pressure and the temperature in the expansion box and the FEP pipe are reduced to normal pressure and low-temperature oil temperature, and respectively washing the inside and the outside of the FEP pipe with water until the product meets the use requirement; the modified CaSi2 is prepared by the following steps: reacting CaSi2 powder, DMF (Dimethyl Formamide), isocyanatopropyltriethoxysilane, 4-hydroxyphenylboronic acid pinacol ester, lanthanum 5-hydroxyisophthalate, organic tin and methylbenzene, washing, carrying out suction filtration, and drying, thereby obtaining the modified CaSi2. The lanthanum 5-hydroxyisophthalate disclosed by the invention is prepared from 5-hydroxyisophthalic acid and lanthanum nitrate; the heat-shrinkable tube prepared by the invention has a relatively high heat shrinkage ratio.

The utility model relates to the technical field of wet synthetic leather dimethyl formamide dilute liquid distillation, and discloses a wet synthetic leather dimethyl formamide dilute liquid distillation device which comprises a distillation cylinder, a connecting ring is fixedly mounted at the top of the distillation cylinder, a fixing bolt is in threaded connection with the top of the connecting ring, and a top cover is in threaded connection with the surface of the fixing bolt. A stirring assembly is arranged in the middle of the top surface of the top cover, an electric valve is fixedly mounted at the bottom of the distillation cylinder, and a retention cylinder is fixedly mounted on the surface of the electric valve. According to the wet synthetic leather dimethylformamide dilute liquid distillation device, through the arrangement of the distillation cylinder, the stirring assembly and the top cover, when a worker carries out distillation operation on dimethylformamide dilute liquid, the dimethylformamide dilute liquid can be placed in the distillation cylinder, and then the liquid in the distillation cylinder is heated by utilizing a temperature controller and a heating wire; and then a power supply of a servo motor is switched on, so that a stirring rod quickly mixes the liquid in the distillation cylinder, and the distillation effect of the liquid is accelerated.

The invention provides a PVP-doped Cu-Mg binary metal electro-catalytic material and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving copper chloride, polyvinylpyrrolidone and magnesium chloride in N, N-dimethylformamide to obtain a mixed solution; the molar ratio of the copper chloride to the magnesium chloride is 1: (0.98-1.02); and under the condition of ice-water bath, stirring the mixed solution, introducing protective gas, dropwise adding a sodium borohydride solution, generating a precipitate, separating, washing, and drying to obtain the PVP-doped Cu-Mg binary metal electro-catalytic material. By doping magnesium, controlling the doping amount of magnesium and combining PVP, the valence state of generated Cu < + > is effectively regulated and controlled, the selectivity of a C2 product is improved, meanwhile, the PVP coating the outer layer protects Cu < + > from being oxidized into Cu < 2 + >, and the stability of the material is effectively improved.