5255 results about "Dimethylformamide" patented technology

The invention relates to a preparation method of a super-hydrophobic cellulose material with a micro-nano structure. The method comprises the following steps: (1) adding ethyl orthosilicate and functionalized siloxane into an ethanol system containing deionized water to obtain a dispersion liquid of functionalized silica particles A in the presence of ammonium hydroxide serving as a catalyst; with the dispersion liquid of functionalized silica particles A as seeds, sequentially adding the ethyl orthosilicate, the functionalized siloxane, the deionized water, the ammonium hydroxide and the ethanol so as to obtain a dispersion liquid of functionalized silica particles B; (2) performing ultrasonic dispersion on the two types of functionalized silica particles in dimethylformamide, then adding a hydrophobic polymer and a low surface energy additive into the system and evenly stirring so as to form white dispersion liquid; and (3) coating the white dispersion liquid obtained in the step (2) on a natural cellulose material in a direct spraying manner or a spin coating manner so as to obtain the super-hydrophobic cellulose material with the micro-nano structure. The coating material has strong scouring resistance and acid-alkali resistance besides the excellent hydrophobic property.

The present invention discloses a medicine with actions of resisting plant virus and resisting tumor-N-substituted benzothiazolyl-1-substituted phenyl-0.0-dialkyl-alpha- aminophosphonates derivative, its preparation method and biological activity. Said invention also provides its structure formula, and also provides its extensive application for inhibiting tobacco mosaic virus (TMV) activity and inhibiting activity of human body prostatic cancer cell PC3 and others.

The invention discloses a high-performance flat-type cellulose acetate/graphene blend forward osmosis membrane. 5 to 25 percent by weight of cellulose acetate, 1 to 15 percent by weight of additives, 0.01 to 2 percent by weight of graphene and mixed solvent of dimethylformamide, dimethylacetamide, or N-methylpyrrolidone and acetone are added into a dissolving tank according to a given sequence and are stirred and dissolved for 2 to 18 hours at the temperature of 5 to 75 DEG C to be uniformly mixed so as to prepare a forward osmosis membrane casting solution; the high-performance flat-type cellulose acetate/graphene blend forward osmosis membrane is prepared on a supporting material by adopting a phase inversion method. According to the forward osmosis membrane, 1M NaCl is used as a driving liquid, the deionized water is used as a raw material solution, the flux of pure water of the forward osmosis membrane is more than 21L/m<2> within the test time of one hour, and the salt flux in the reverse direction is less than 3.5g/m<2>.

The invention discloses a graphite type carbon nitride-metal organic frame composite photocatalyst as well as a preparation method and application of the graphite type carbon nitride-metal organic frame composite photocatalyst. Graphite type carbon nitride acts as a carrier of the graphite type carbon nitride-metal organic frame composite photocatalyst; metal organic framework particles freely grow on the surface of graphite type carbon nitride, and the surfaces of the metal organic framework particles are loaded with carbon nitride nano sheets. The preparation method comprises the following steps: carrying out ultrasonic dispersion on graphite type carbon nitride into dimethylformamide so as to obtain a graphite type carbon nitride dispersion solution; stirring and mixing a carbon nitride dispersion solution, tetrabutyl titanate, methyl alcohol and an organic solvent so as to obtain a mixed solution; heating and reacting the mixed solution in a seal environment so as to obtain the graphite type carbon nitride-metal organic frame composite photocatalyst. The graphite type carbon nitride-metal organic frame composite photocatalyst can remove dye in waste water, and has the advantages of simplicity, high efficiency, environment friendliness, economic property, environment protection and the like.

The invention relates to a method for recycling anode material of a lithium ion battery, which includes the processes: organic solvent is used for soaking anode plates of the battery so as to separate the anode material from a current collector; the current collector is taken out and filtered to obtain anode active substances; the anode active substances are parched. The organic solvent is the mixed solvent of the N, N - dimethylformamide and liquid alcohol and/or liquid ketone. By adopting the mixed solvent, the invention greatly promotes the recycling efficiency of the anode material; in the method of the invention, the recycling rate of the anode material is higher by over 20 per cent compared with the prior art in the situation of adopting different used organic solvent but other same conditions; besides, by adopting the method provided by the invention, the needed production time is greatly shortened and the production efficiency is promoted.

The invention discloses a multi-scale reinforcement body that carbon nano-tube is connected with carbon fiber and a preparation method aiming at solving the drawbacks of increasing rigidity at the interface, lowering toughness of material and not improving performance of resin base between the fibers and between carbon fiber plywoods after prior carbon fiber treatment is made. The multi-scale reinforcement body of carbon nano-tube connecting carbon fiber is made through combining between a carbon nano-tube decorated by 1, 6 hexamethylenediamine and carbon fiber with acyl chloride functional group on the surface. The preparation method comprises: the carbon nano-tube decorated by 1, 6 hexamethylenediamine and the carbon fiber with acyl chloride functional group on the surface are prepared before put into N,N-dimethylformamide for reaction, thereby getting the multi-scale reinforcement body of carbon nano-tube connecting carbon fiber. The invention has the advantages of big activity on the surface, a plurality of chemical activated functional groups, strong reactive activity, good cohesiveness with the base, improving shearing intensity at the interface for composite material by 127.5% to 144.7% and improving toughness for the base by 34.43% to 48.67%.

The invention relates to a preparation method of an inorganic/organic hybridization antibacterial film. The preparation method mainly comprises the steps of: (1) preparing a nano-silver-loaded molecular sieve germicide with stronger stability by ion exchange and a chemical reduction method; and preparing a molecular sieve/polymer hybridization antibacterial film loaded with nano-silver particles by a phase transformation film preparation process; and (2) taking N,N-dimethylformamide as a solvent and a reducing agent simultaneously, reducing silver ions to nano-silver serving as an antibacterial function body in a film casting liquid system in situ, and firmly loading the nano-silver in a polymer porous matrix material by a dispersion action and a coupling action of a coupling agent so as to form a nano-silver-loaded polymer porous film. The hybridization antibacterial film, provided by the invention, keeps excellent water flux, high retention rate and tough mechanical intensity, and has excellent antibacterial function, and can effectively solve the problems of loss of the silver ions of the silver-ion-loaded molecular sieve in the membrane filtration, loss of the nanometer inorganic particles in the polymer porous matrix, easy pollution of a separation film by microorganisms, and the like.

The invention relates to a molybdenum disulfide/carbon black composite hydrogen-evolution electrocatalytic material and a preparation method therefor and belongs to the field of electrocatalytic hydrogen evolution. According to the preparation method, firstly, a carbon black oxide with low degree of oxidation is prepared by adopting an improved Hummer method; and then, the molybdenum disulfide/carbon black composite hydrogen-evolution electrocatalytic material is prepared through one-step solvothermal reaction at the temperature of 220 DEG C in a manner of taking sodium molybdate crystals as a molybdenum source, taking sulfourea as a sulfur source and taking dimethylformamide as a solvent. According to the method provided by the invention, the carbon black oxide with low degree of oxidation is simple in preparation process and high in yield; the molybdenum disulfide/carbon black composite hydrogen-evolution electrocatalytic material is prepared by adopting a simple, convenient and mild one-step solvothermal method, the cost is low, the repeatability is high, and large-scale synthesis is facilitated. When the molybdenum disulfide/carbon black composite hydrogen-evolution electrocatalytic material is applied to electrocatalytic hydrogen evolution reaction, excellent catalysis performance is shown, the reduced current density reaches 25.0mA/cm<2> when tested overpotential is 200mV, and the reduced current density reaches 36.2mA/cm<2> when tested overpotential is 226mV; the molybdenum disulfide/carbon black composite hydrogen-evolution electrocatalytic material has good electrocatalytic stability.

A process for preparing hydrofluoroether features the reaction between one of trifluoroethene, tetrafluoroethene, hexafluoro propene, etc and one of trifluoroethanol, trifluoropropanol, metanol, etc in organic solvent (DMF or DMSO). Its advantages are high output rate and easy purifying and separating.

The invention relates to a preparation process of a metal-organic framework porous adsorption material for C4-C8 normal paraffin and isoparaffin adsorption separation. According to the preparation method of the synthesized metal-organic framework porous adsorption material, metal ion nitrate and an organic ligand are dissolved according to the mass ratio of 1:1-15 in a mixed solution of N,N-dimethylformamide and N,N-diethyl formamide; stirring is carried out for 0.5-12 h; reaction temperature is controlled to 80-250 DEG C, and reaction time is 12-120 h; and by a hydrothermal synthesis method, the metal-organic framework porous adsorption material is prepared. The material has characteristics as follows: specific surface area is large; pore structure height is ordered; pore size is controllable; surface potential energy is controllable; and adsorption capacity of normal paraffin is large. The material can selectively adsorb normal paraffin from mixed materials of normal paraffin and isoparaffin, has high selectivity and has a wide practical application prospect in normal paraffin and isoparaffin separation.

The invention belongs to the technical field of polymer synthesis, and relates to aqueous poly(urethane-acrylate) emulsion modification, particularly to an aqueous graphene oxide modified poly(urethane-acrylate) composite material preparation method. According to the preparation method, an improved Hummers method is adopted to prepare graphene oxide, the graphene oxide is dissolved in N,N'-dimethylformamide, ultrasonic peeling is performed to prepare a graphene oxide dispersion solution, and the graphene oxide dispersion solution and n-butylacrylate are adopted to co-modify polyurethane. With the preparation method, the prepared composite material emulsion is uniform and stable, and the curing film has good mechanical property, and can be used in the fields of printing, packaging, furniture, electrical equipment, small metal parts, instrument panels, flooring, wood, paper coating, leathers, plastics, home appliances, electronics, telecommunications, aerospace, aviation and the like.

The invention discloses a method for preparing a polypyrrole coated bacterial cellulose nanometer electric-conduction composite material by utilizing bacterial cellulose as a template; impurity removal is carried out on protogenetic dynamically-fermented bacterial cellulose nanometer fiber, so as to obtain moist bacterial cellulose after pretreatment; the moist bacterial cellulose is arranged in deionized water for uniform dispersion; dimethylformamide and pyrrole monomers are added and stirred to enable the pyrrole monomer to be fully dispersed into a bacterial cellulose network; and a mixed solution of oxidant and doping agent is added for carrying out in-situ oxidation polymerization, and an obtained crude product is washed by acetone (ethanol), deionized water and hydrochloric acid solution sequentially and repeatedly, and then is frozen and dried, so as to obtain a finished product. The nanometer electric-conduction composite material obtained by the invention has higher electric conduction efficiency, lower cost, mild reaction and low toxicity.

The present invention relates to an aligning agent for liquid crystal containing at least a polymer and solvent selected from polyamic acid and polyimide gained by dewatering closed-loop, the solvent contains: (A) a first solvent containing compound with formula (I); (B) a second solvent selected from at least one of N-methyl-2-pyrrolidone, gamma-butyrolactone, 1,3-dimethyl-2-imidazolone, N, N-dimethylformamide and N, N- dimethylacetylamide; and (C) a third solvent selected from at least one of butyl cellosolve, diacetone alcohol, carbonic sub-propyl ester, diethylene glycol diethyl aether and ethyl-3- oxethyl propionic ether. (In formula (I) the R respectively represents alkyl with 3 to 10 carbon atoms).

The invention discloses a preparation method of a polyacrylonitrile/polyaniline compound micro-nano conductive fiber. The preparation method comprises the following steps of: (1) dissolving polyacrylonitrile and polyethylene glycol into dimethylformamide; standing, de-foaming, and spinning a polyacrylonitrile/polyethylene glycol micro-nano fiber in an electrostatic spinning device; (2) placing the polyacrylonitrile/polyethylene glycol micro-nano fiber into water of 40-90 DEG C for 10-60 minutes to obtain a polyacrylonitrile porous micro-nano fiber; and (3) adding an aniline monomer into hydrochloric acid; uniformly agitating and immersing the polyacrylonitrile porous micro-nano fiber in the solution; and adding hydrochloric acid dissolved with ammonium persulfate to react for 0.5-3 hours to obtain the polyacrylonitrile/polyaniline compound micro-nano conductive fiber. The polyethylene glycol used in the preparation method disclosed by the invention is a water-soluble polymer which has a wide application range, has no pollution to an environment, and is cheap and easy to obtain, environment-friendly and low in cost.

The invention provides a synthetic method and application of a metal-organic framework (MOF) composite nanomaterial. The method comprises the following steps: dispersing ferriferrous oxide magnetic spheres which are synthesized through a traditional hydrothermal technology in a weakly alkaline solution of dopamine hydrochloride to carry out self-polymerization of dopamine on the surfaces of the magnetic spheres; and sequentially dispersing polydopamine coated magnetic spheres in a dimethylformamide solution of zirconium chloride and a dimethylformamide solution of 2-amino-terephthalic acid to obtain the MOF composite nanomaterial with the magnetic sphere surfaces coated with polydopamine and modified with an amino group and with zirconium as a center metal ion. The material has the advantages of large specific surface area, good hydrophilicity and suitable pore structure, can be applied to further researches of the proteomics, and can specifically enrich Which can specifically enrich phosphorylated peptide segments and glycopeptides; the synthetic method is simple and quick; and the synthesized material has good hydrophilicity and biocompatibility, and can be used for selectively enriching endogenous phosphorylation peptide segments and glycopeptide in complex biological samples.

The present invention relates to a H-grade low-temp. direct-welding enamelled wire enamel, said enamel liquor mainly includes three portions of hydroxyl component, closed type isocyanate component and solvent. The hydroxyl component is formed from raw materials of dihydric alcohol terephthate or amidoimide dihydric alcohol, new pentanediol or 2-methyl-1,3-propanedio, glycerine, 1,1,1-trihydroxymethyl propane, tri(alpha-hydroxyethyl) isocyanate, adipic acid and phthalic anhydride. The acid value of polyester polybasic alcohol is less than 2, hydroxy value is 70-250, number-average molecular weight is 2000-7000 and molecualr weight distribution index is 2-3. The isocyanate component is made up by using general raw material TDI and MDI through the processes of cyclic self-polymerization or addition with small quantity of tribasic alcohol and closing with dimethyl phenol.

The invention discloses a metal organic framework material as well as a preparation method and application thereof. The chemical molecular formula of the metal organic framework material is {[M3(P)3(Q)2].5DMF.2H2O}n, wherein M is one or more metal cations selected from the group consisting of Fe<2+>, Co<2+>, Ni<2+>, Cu<2+>, and Zn<2+>; P is an organic ligand 2',3'-dimethyl-p-terphenyl-4,4''-dicarboxylic acid; Q is one or more auxiliary organic ligands selected from the group consisting of 4,4'-dipyridyl, 2-phenylpyridyl, 4-phenylpyridinium, and 1,4-di(p-pyridyl)benzene; DMF is (i)N, N'(/i)-dimethylformamide. The metal organic framework material provided by the invention has good water resistance and thermal stability resistance; due to the presence of 2', 3'-dimethyl group, the process ofan interpenetrating network is restricted to a certain degree, and the excessive orifices in the metal organic framework material are narrowed.

The invention discloses a cellulose acetate/nano titanium dioxide mixed media hollow fiber positive osmotic membrane. 0.05-4.0% (w/w) of nano titanium dioxide and 0.01-1.0% (w/w) of oxidized graphene are added into a solution composed of N-methyl-pyrrolidone or dimethylacetamide or dimethylformamide and 1,4-dioxane, 3.0-21.0% (w/w) of additives is added, uniform stirring is carried out for 5-60min, then 15.0-40.0% (w/w) of cellulose acetate is added, full stirring is carried out at a temperature of 20-70 DEG C, the mixture is allowed to stand, and a hollow fiber positive osmotic membrane is obtained through spinning. The osmotic membrane employs 1M of NaCl as a drive liquid and deionized water as a raw material liquid, the water flux is 16.5L/m2h, the reverse salt flux is less than 3.5g/m2h, and the contact angle is 60.2 degrees in test time of 1h.

A sol-gel method for forming durable, scratch-resistant coatings on glass substrates. Zirconia coatings, for example, are formed from a solution of zirconium oxychloride octahydrate in an organic, polar, aprotic solvent such as dimethylformamide. Annealed coatings, which optionally include an additive such as graphene, have a low coefficient of friction and can exhibit high hardness and hydrophobicity.