25 results about "Dimethyl acetamide" patented technology

The invention relates to the technical field of batteries, and discloses an electrolyte and application thereof, and a lithium carbon fluoride battery. The electrolyte comprises a lithium salt and an organic solvent; wherein the lithium salt is lithium bis (fluorosulfonyl) imide; the organic solvent is selected from one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, dimethylformamide, dimethylacetamide and dimethyl sulfoxide. The electrolyte can be applied to preparation of a lithium primary battery. The invention also relates to a lithium carbon fluoride battery comprising the electrolyte. The electrolyte system provides an optimized solution for the preparation of the high-energy-density lithium carbon fluoride battery, has a wide application prospect, can remarkably improve the performance of the battery, reduces the production cost, and promotes the further development of the lithium carbon fluoride battery technology.

The invention relates to a synthesis method of an allyl amine compound. According to the method, 2-methylquinoline or acetophenone derivatives are used as raw materials, a selective fluorine reagent Selectfluor is used as an accelerant, dimethyl sulfoxide and N 'N-dimethylacetamide are used as a mixed solvent, and the allyl amine series compounds are prepared with high yield. The preparation method has the advantages of being low in cost, easy to operate, green, free of pollution and the like, and has potential industrial application prospects. The method provides a green, cheap and convenient way for preparing the allyl amine derivative by using 2-methylquinoline or acetophenone compounds as initiators.

This invention discloses an organosilicon side-chain modified acrylate polymer antifouling coating and its preparation method. The antifouling coating consists of component A and component B. Component A is prepared by dissolving polytetrahydrofuran ether diol in N,N-dimethylacetamide and reacting it with diisocyanate. Component B is prepared by mixing methyl methacrylate, acrylic acid, hydroxyacrylate, acryloyloxypropylsilane, and ethyl acetate, adding a peroxide initiator, and then performing free radical polymerization. The antifouling coating prepared by this invention exhibits excellent substrate adhesion and antifouling properties, making it suitable for antifouling of marine vessels.

The invention provides a polymer solid electrolyte and a preparation method thereof, a sodium ion battery and electric equipment, and relates to the field of solid electrolytes. The preparation method comprises the following steps: mixing dimethylacetamide, N-methyl pyrrolidone, a brominated flame retardant, a dianhydride monomer and a diamine monomer to obtain a first mixed solution; coating the surface of a glass plate with the first mixed solution to obtain a film; mixing the thin film, dimethylacetamide and ethanol, and performing first drying to obtain a porous film; carrying out thermosetting on the porous membrane to obtain an imidization porous membrane; polyoxyethylene, bis (trifluoromethylsulfonyl) imide sodium and acetonitrile are mixed, and a second mixed solution is obtained; and mixing the imidization porous membrane with the second mixed solution, heating in a vacuum environment, and carrying out second drying to obtain the polymer solid electrolyte. The flame retardant is added for coating to obtain the film, and then the film is subjected to pore forming and imidization, so that the film has high mechanical strength, and has incombustibility and high safety while potential sodium dendritic crystal permeation can be prevented.

The application provides a method for catalytic degradation of polyolefin plastic by using a eutectic solvent, comprising the following steps: placing polyolefin plastic particles, C4-C6 alkane, amide-AlCl3 eutectic solvent, initiator and polychloromethane in a reactor to perform a catalytic degradation reaction in a water-free and sealed environment to obtain a hydrocarbon product; wherein the C4-C6 alkane is added before the polyolefin plastic particles and the amide-AlCl3 eutectic solvent coexist in the reactor; the amide-AlCl3 eutectic solvent comprises an amide compound and AlCl3; the amide compound is selected from one or more of chloroacetamide, formamide, acetamide, N-methyl formamide, N-methyl acetamide, N,N-dimethyl acetamide, N,N-diethyl acetamide and N,N-dimethyl formamide; the application first applies the eutectic solvent to the catalytic degradation of the polyolefin plastic, and solves the problems of low efficiency and high cost of the traditional method at low temperature.

A process for producing cellulose ester fibers is provided, the process comprising dry spinning a cellulose ester dope through a spinneret to make the cellulose ester fibers, wherein the cellulose ester dope comprises dissolved and / or dispersed solids (hereinafter "solids" ) and solvent, at least 35 wt. % of the solids comprises cellulose ester, and the solvent comprises N, N-dimethylformamide, N,N-dimethylacetamide, or dimethyl sulfoxide, or mixtures thereof, provided that if the solvent comprises N, N-dimethylacetamide: (i) the cellulose ester dope comprises not more than 50% by weight acetone, based on the total weight of the cellulose ester dope; or (ii) the cellulose ester dope comprises 0% by weight cellulose nanocrystals based on the total weight of the cellulose ester dope; or (iii) both (i) and (ii), wherein the combined weight of a polyurethane, polyolefin, nylon, polyester, and / or polyurethaneurea, if present in the cellulose ester dope, is not more than 60% by weight, based on the total solids in the cellulose ester dope; and wherein there is a substantial absence of an organic acid.

Provided are silica sols containing organic acids dispersed in nitrogen-containing organic solvents, and insulating resin compositions comprising the silica sol and nitrogen-containing polymers. The silica sol is a silica sol in which silica particles having an average primary particle size of 5-100 nm are dispersed in a nitrogen-containing organic solvent, and the silica sol contains a carboxylic acid with 1-3 carbon atoms in a proportion of 80-1500 ppm. The nitrogen-containing organic solvent is an amide-based silica sol. The nitrogen-containing organic solvent is a silica sol containing dimethylacetamide, dimethylformamide, or dimethylpropionamide. The carboxylic acid with 1-3 carbon atoms is a silica sol containing formic acid, acetic acid, or propionic acid. The insulating resin composition comprises a silica sol and a nitrogen-containing polymer.

The invention discloses a production process of polyacrylonitrile-based carbon fibers, and belongs to the related field of carbon fiber production. The production process comprises the following steps: preparing acetylene by adopting a natural gas partial oxidation method and by-producing acetylene tail gas; preparing hydrocyanic acid by adopting a natural gas ammoxidation method; acrylonitrile is synthesized through an acetylene-hydrocyanic acid method; preparing carbon fibers from acrylonitrile; the acetylene tail gas is divided into three parts, one part is used for extracting hydrogen and carbon monoxide; one part is used for synthesizing ammonia; the last part is used for producing methanol; hydrogen extracted from acetylene tail gas is used as hydrogen for carbon fiber synthesis; the ammonia part synthesized from the acetylene tail gas is used for synthesizing hydrocyanic acid; part of the mixed methylamine and methanol synthesized by acetylene tail gas are synthesized into mixed methylamine, dimethylamine separated from the mixed methylamine and carbon monoxide extracted from the acetylene tail gas are subjected to carbonylation reaction to generate dimethylacetamide, and the dimethylacetamide is used for preparing carbon fibers prepared from acrylonitrile. The whole-process industrial chain constructed by the method can realize closed-loop production, and the whole-cycle carbon emission is remarkably reduced while the resource utilization rate is increased.

The application belongs to the technical field of preparation of flame-retardant fibers, and discloses a preparation method of flame-retardant polyacrylonitrile fibers and the flame-retardant polyacrylonitrile fibers, the preparation method comprising the following steps: (1) adding a composite flame retardant powder and a polyacrylonitrile powder into dimethylacetamide, grinding and dispersing, and then filtering to obtain a flame-retardant slurry; (2) adding the polyacrylonitrile powder into dimethylacetamide, uniformly mixing, and heating to completely dissolve to obtain a polyacrylonitrile stock solution; (3) preparing a spinning stock solution: uniformly mixing the flame-retardant slurry and the polyacrylonitrile stock solution according to the mass ratio of the composite flame retardant to the polyacrylonitrile being 1:2.3-4.0 to obtain the spinning stock solution; and (4) spinning by using the spinning stock solution to prepare the flame-retardant polyacrylonitrile fibers. The application adds a certain amount of polyacrylonitrile in the flame-retardant slurry, which can more easily uniformly mix with the polyacrylonitrile stock solution, can increase the addition amount of the composite flame retardant in the fibers, and will not obviously affect the mechanical properties of the fibers.

The invention relates to a continuous preparation method of 2-chloro-N, N-dimethyl nicotinamide, and belongs to the technical field of organic synthesis. In a tubular reactor, 3-di-n-propylamino acrolein and 2-cyano-N, N-dimethylacetamide are used as raw materials to react, the obtained product reacts with hydrogen chloride, and 2-chloro-N, N-dimethyl nicotinamide is obtained. The tubular reactor is adopted for continuous production, so that the reaction period is greatly shortened, the process operation is reduced, and the reaction cost is reduced.

This invention discloses a fiber pretreatment method and the application of the pretreated fibers. The method involves dissolving the fibers in dimethylacetamide at room temperature to obtain dissolved fibers. These dissolved fibers are then treated in a LiCl / DMAc solution. After removing the reagents by squeezing, the fibers are washed, filtered, and dried to obtain pretreated fibers. These pretreated fibers are then used in the preparation of glue-free laminated fiberboard. The LiCl / DMAc solution treatment significantly increases the area of ​​the self-bonding interface of the fibers and enhances the surface hydroxyl activity. During the glue-free bonding process, not only do the degradation products of hemicellulose and lignin self-bond, but cellulose also melts and regenerates to form filaments, which then self-bond under hydrogen bonding, significantly improving the performance of the glue-free laminated board.

The invention discloses an antibacterial fiber, a preparation method thereof and a fabric, relates to the technical field of functional fibers, and belongs to the patent publication number D01F6 / 54. The preparation method of the antibacterial fiber comprises the following steps: uniformly mixing an acrylonitrile monomer, vinyl acetate, methacryloyloxyethyl trimethyl ammonium chloride and absolute ethyl alcohol to obtain a mixed solution; adding polyvinyl alcohol into the mixed solution, heating, stirring and reacting to obtain polyacrylonitrile copolymer powder; polyvinylpyrrolidone and nano-zinc oxide are added into dimethylacetamide, and nano-antibacterial dispersed slurry is obtained; polyacrylonitrile copolymer powder is added into the nano-antibacterial dispersion slurry, and a composite nano-antibacterial spinning stock solution is obtained; and conveying the composite nano antibacterial spinning solution to a spinning machine for spinning to obtain the antibacterial fiber. The antibacterial fiber fabric prepared by the method disclosed by the invention has excellent antibacterial performance and antibacterial durability.

This invention relates to pharmaceutical formulations and formulation strategies of protides (phosphoramidate derivatives of nucleosides) and, in particular, protides useful in the treatment of cancer such as NUC-3373 (5-fluoro-2′-deoxyuridine-5′-O-[1-naphthyl (benzoxy-L-alaninyl)] phosphate) and NUC-7738 (3′-deoxyadenosine-5′-O-[phenyl (benzyloxy-L-alaninyl)] phosphate). In particular, the invention relates to formulations which comprise a polar aprotic solvent, for example dimethyl acetamide (DMA).

Provided are stable, concentrated, and palatable solutions suitable for sublingual and / or transurethral administration containing tadalafil, with or without other active ingredients to address comorbidities, in a liquid vehicle or solvent selected from propylene carbonate, 2-pyrrolidone, dimethyl isosorbide, dimethyl acetamide, n-methyl-2-pyrrolidone, ethanol, water, oleic acid, and isopropyl myristate. The solutions have low irritancy for sublingual tissues and a-are compatible with commercial atomizers. The invention is further directed to methods of treating male erectile dysfunction and / or comorbidities by administering an effective amount of the pharmaceutical formulations comprising tadalafil, with or without other active ingredients, to a patient in need of such treatments.

The invention relates to a perovskite modification solution, a perovskite cell, a preparation method of the perovskite cell and a photovoltaic module. The perovskite modifying solution comprises a modifying agent, a passivating agent, a first solvent and a second solvent, the first solvent comprises at least one of dimethyl sulfoxide, dimethyl acetamide, N-methyl pyrrolidone, N-ethyl pyrrolidone, tetramethylene sulfoxide, methyl phenyl sulfoxide and butyrolactone, and the second solvent comprises at least one of dimethyl sulfoxide, dimethyl acetamide, N-methyl pyrrolidone, N-ethyl pyrrolidone, tetramethylene sulfoxide, methyl phenyl sulfoxide and butyrolactone; the second solvent comprises at least one of isopropanol, anisole, chlorobenzene, dichlorobenzene and ethyl acetate. According to the perovskite modification solution, the modification agent, the passivating agent and the specific type of the first solvent and the second solvent cooperate with each other to act together, so that the stability and the photoelectric conversion efficiency of the perovskite battery can be effectively improved.

This invention discloses a thermally conductive aramid insulating paper-based material, its preparation method, and its application. The preparation method of the thermally conductive aramid insulating paper-based material includes the following steps: (1) introducing amino groups onto the surface of boron nitride nanosheets to obtain aminated boron nitride nanosheets; (2) dissolving m-phenylenediamine in N,N-dimethylacetamide, then adding isophthaloyl chloride, and then adding aminated boron nitride nanosheets, and reacting to obtain a thermally conductive aramid polymer solution; (3) wet spinning the thermally conductive aramid polymer solution to obtain thermally conductive aramid fibers; (4) mixing the thermally conductive aramid fibers with precipitated fibers to form a thermally conductive aramid insulating paper-based material. This invention utilizes the amide group connection between aminated boron nitride nanosheets and aramid macromolecules to improve the interfacial compatibility between fillers and substrates in paper materials, thereby improving the strength and thermal conductivity of paper materials.

A process for producing cellulose ester fibers is provided, the process comprises dry spinning a cellulose ester dope through a spinneret to make the cellulose ester fibers, wherein the cellulose ester dope comprises dissolved and / or dispersed solids (hereinafter "solids") and solvent, at least 35 wt.% of the solids comprises cellulose ester, and the solvent comprises N, N-dimethylformamide, N, N-dimethylacetamide, or dimethyl sulfoxide, or mixtures thereof, provided that if the solvent comprises N, N-dimethylacetamide: (i) the cellulose ester dope comprises not more than 50% by weight acetone, based on the total weight of the cellulose ester dope; or (ii) the cellulose ester dope comprises 0% by weight cellulose nanocrystals based on the total weight of the cellulose ester dope; or (iii) both (i) and (ii), wherein the combined weight of a polyurethane, polyolefin, nylon, polyester, and / or polyurethaneurea, if present in the cellulose ester dope, is not more than 60% by weight, based on the total solids in the cellulose ester dope; and wherein there is a substantial absence of an organic acid.

A highly efficient carbon fiber surface treatment method and its composite material belong to the field of composite material technology. Step 1: Wash the carbon fiber with acetone to completely remove sizing agent and impurities, then dry it. Step 2: Wind the carbon fiber onto a glass frame and perform plasma treatment under an O2-Ar mixed gas atmosphere. Step 3: Dissolve polyimide resin in N,N-dimethylacetamide to prepare a resin solution. Step 4: Prepare a prepreg by combining the carbon fiber and resin solution. Step 5: Stack multiple prepreg sheets, set a stepped heating program, and prepare the composite material by high-temperature hot pressing. In this invention, Ar plasma etches the carbon fiber surface, increasing the surface area and surface roughness, while O2 plasma introduces oxygen-containing functional groups into the carbon fiber surface. The synergistic effect of these two processes improves the mechanical interlocking and chemical bonding between the carbon fiber and the resin matrix, significantly enhancing the interlaminar shear strength at both room temperature and high temperature.

The application discloses an antibacterial fiber and a preparation method and fabric thereof, relates to the technical field of functional fibers, and belongs to the patent publication D01F6 / 54. The preparation method of the antibacterial fiber comprises the following steps: uniformly mixing acrylonitrile monomers, vinyl acetate, methyl methacryloyloxyethyl trimethyl ammonium chloride and anhydrous ethanol to obtain a mixed solution; adding polyvinyl alcohol into the mixed solution and performing heating and stirring reaction to obtain polyacrylonitrile copolymer powder; adding polyvinylpyrrolidone and nano zinc oxide into dimethylacetamide to obtain nano antibacterial dispersion slurry; adding the polyacrylonitrile copolymer powder into the nano antibacterial dispersion slurry to obtain composite nano antibacterial spinning stock solution; and conveying the composite nano antibacterial spinning stock solution to a spinning machine for spinning to obtain the antibacterial fiber. The antibacterial fiber fabric prepared by the application has excellent antibacterial performance and antibacterial durability.

The application discloses a kind of superfine high-strength meta-aramid fiber and its preparation method, by adjusting wet spinning coagulation bath type and reducing coagulation bath temperature, realize super-drawing, to obtain superfine high-strength meta-aramid fiber.Ethyl acetate and dimethylacetamide are used as coagulation bath, and the temperature of coagulation bath is reduced at the same time, so that the coagulation speed of the fiber in the coagulation bath is slower, and the intermolecular force of the fiber is stronger, forming a more stable network gel state, with very excellent stretchability.The meta-aramid fiber prepared by the method has a diameter of 1.43um, a tensile ratio of up to 8000 times, a breaking strength of 1332MPa, and an elongation at break of more than 20%.

The invention discloses a method for efficiently separating anthracene and carbazole in crude anthracene by adopting a nonionic composite extractant, and belongs to the technical field of oil product separation. According to the method, the anthracene and the carbazole are extracted from the oil through solid-liquid extraction by taking a deep eutectic solvent-organic auxiliary agent as an extracting agent. The extraction agent is formed by reacting a deep-eutectic solvent consisting of a hydrogen bond acceptor and a hydrogen bond donor with an organic auxiliary agent containing nitrogen and oxygen, wherein the hydrogen bond acceptor is acethydrazide; the hydrogen bond donor is selected from ethylene glycol, 1, 3-propylene glycol and 1, 4-butanediol; the organic auxiliary agent containing nitrogen and oxygen is selected from N, N-dimethyl formamide, N-methyl pyrrolidone, N, N-dimethyl acetamide, formamide and ethanol. The water bath reaction temperature is 75-80 DEG C; results show that the composite extractants can efficiently separate anthracene and carbazole in crude anthracene, the selectivity is doubled, and the nonionic composite extractants are low-price and environment-friendly extractants.

The invention discloses pole piece slurry of a high-capacity lithium battery for an unmanned aerial vehicle and a coating process of the pole piece slurry, and belongs to the technical field of electrode materials, the pole piece slurry is prepared from the following raw materials in parts by mass: 5-8 parts of polybenzimidazole, 40-50 parts of dimethylacetamide, 15-20 parts of MOF-loaded composite graphene, 3-4 parts of carbon nanotubes and 5-10 parts of conductive carbon black; the MOF-loaded composite graphene is prepared by adsorbing and loading p-aminobenzoic acid with MOF composite graphene; the MOF composite graphene is prepared by in-situ synthesis of Cu-MOF on the surface of modified graphene; through amidation reaction of polybenzimidazole and p-aminobenzoic acid on the surfaces of the graphene oxide nanosheets, the heat resistance and mechanical properties of the binder are improved, and the bonding effect of the binder on the graphene oxide nanosheets is improved by synthesizing a porous structure on the surfaces of the graphene oxide nanosheets. And shedding of the graphene nanosheets caused by high temperature and electrolyte is reduced.

The invention relates to the field of crude product separation in the production process of epoxy chloropropane, and discloses a method for separating chloropropene-chloropropane. The method comprises the following steps: (1) in the presence of an extraction agent, carrying out extractive distillation on a crude product containing chloropropane and chloropropene to obtain a chloropropane product and a mixture of chloropropene and the extraction agent; (2) separating the chloropropene and extractant mixture to obtain a chloropropene product and an extractant; the extraction agent is selected from at least one of water, furfural, aniline, ethylene glycol, 1, 3-propylene glycol, glycerol, dimethyl sulfoxide, N-methyl pyrrolidone, N, N-dimethyl formamide and N, N-dimethyl acetamide. The method provided by the invention realizes effective separation of chloropropene and chloropropane, and the chloropropene product obtained by separation has high purity and low energy consumption.

The invention discloses a preparation method of flame-retardant heat-insulating carbon fibers with a three-dimensional cage carbon structure, and belongs to the technical field of composite flame-retardant materials. The preparation method comprises the following steps: mixing and dispersing epoxy resin, polyhedral oligomeric silsesquioxane and dimethylacetamide to form a mixed solution, mixing the mixed solution, a curing agent, an accelerant and a coupling modifier to form a mixed spinning solution, and performing electrostatic spinning on the mixed spinning solution to obtain a nanofiber felt; polyacrylonitrile precursors are sequentially subjected to pre-oxidation treatment and carbonization treatment to obtain carbon fibers, the carbon fibers are subjected to anodic oxidation treatment to obtain pretreated carbon fibers, and the pretreated carbon fibers are dip-coated with a sizing agent to obtain modified carbon fibers; the modified carbon fiber and the nanofiber felt are bonded through a flame-retardant fire-extinguishing adhesive, and are subjected to hot press molding to obtain the flame-retardant heat-insulating carbon fiber. The flame-retardant and heat-insulating carbon fiber prepared by the invention not only has good flame-retardant and heat-insulating properties, but also has good mechanical properties.

The application discloses a high-ionic-conductivity high-temperature-resistant lithium ion battery diaphragm and a preparation method thereof, and belongs to the technical field of battery diaphragms, and is used for solving the technical problem that the high-temperature resistance and ionic conductivity of the lithium ion battery diaphragm in the prior art need to be further improved. The preparation method of the high-ionic-conductivity high-temperature-resistant lithium ion battery diaphragm comprises the following steps: dissolving polyphthalic amide and modified cellulose into an N,N-dimethylacetamide solution to form a spinning solution, and then adopting electrostatic spinning to prepare a spinning base film with a thickness of 29-31 mu m. After the electrostatic spinning of the polyphthalic amide and the modified cellulose as raw materials, the triazine modification is performed on the spinning base film, and then the inorganic coating liquid is used for coating, so that the mechanical strength and the heat-resistant stability of the battery diaphragm are effectively improved, the ionic conductivity is also improved, and the charging and discharging efficiency of the lithium battery is improved.