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1738 results about "Dimethylacetamide" patented technology
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Dimethylacetamide (DMAc or DMA) is the organic compound with the formula CH₃C(O)N(CH₃)₂. This colorless, water-miscible, high boiling liquid is commonly used as a polar solvent in organic synthesis. DMA is miscible with most other solvents, although it is poorly soluble in aliphatic hydrocarbons.
Process for preparation of cefdinir
InactiveUS6093814ALow priceManufacturing timeAntibacterial agentsOrganic active ingredientsP-Toluenesulfonic acidCefdinir
PCT No. PCT / KR96 / 00250 Sec. 371 Date May 18, 1998 Sec. 102(e) Date May 18, 1998 PCT Filed Dec. 26, 1996 PCT Pub. No. WO97 / 24358 PCT Pub. Date Jul. 10, 1997The present invention relates to a novel crystalline cefdinir intermediate having formula (II) which can be used very usefully for preparing a cephalosporin antibiotics, cefdinir, in which Ph represents phenyl, p-TsOH represents p-toluenesulfonic acid, and DMAC represents N,N-dimethylacetamide, to a process for preparation thereof and to a process for preparing cefdinir using the compound of formula (II). According to the present invention, cefdinir can be prepared in an excellent color and purity and with a good yield.
Owner:HANMI SCI CO LTD
Polyvinylidene fluoride/graphene composite and preparation method thereof
ActiveCN102604275AHigh dielectric constantImprove toughnessFixed capacitorsDielectricPolyvinylidene difluoride
The invention discloses polyvinylidene fluoride / graphene composite and a preparation method thereof. The preparation method includes: reducing oxidation graphene by reductant, mixing the reduced graphene and polyvinylidene fluoride with N, N-dimethylacetamide solvent to be solution, drying and hot-pressing the solution to obtain the polyvinylidene fluoride / graphene composite. The prepared polyvinylidene fluoride / graphene composite has the following advantages that 1) dielectric constant of the polyvinylidene fluoride / graphene composite is high and can reach 7940 on the condition of 100Hz frequency and the weight percentage of the graphene is 0.02; and 2) flexibility is fine. Meanwhile, the preparation method has the advantages of simple operation and high stripping and dispersing degree of graphene and the like.
Owner:嘉善县国创新能源研究院
High-performance flat-type cellulose acetate/graphene blend forward osmosis membrane
ActiveCN104474919APollution resistantImprove hydrophilicitySemi-permeable membranesCellulose acetateN-Methyl-2-pyrrolidone
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>.
Owner:UNIV OF JINAN
Preparation method of hydrogenated xylylene diisocynate
ActiveCN106674056AGood dispersionImprove liquidityOrganic compound preparationIsocyanic acid derivatives purification/separationXylyleneN dimethylformamide
The invention discloses a preparation method of hydrogenated xylylene diisocynate. The preparation method of the hydrogenated xylylene diisocynate comprises the following steps: (1) performing salt forming reaction on 1,3-cyclohexanol dimethylamine and concentrated hydrochloric acid in a two-phase reaction solvent to obtain amine salt, wherein the two-phase reaction solvent consists of water and an inert organic solvent insoluble in water ; (2) performing photochemical reaction on the ammonium salt obtained in the step (1) and phosgene in an inert solvent by taking N,N-dimethylformamide or N,N-dimethylacetamide as a catalyst to obtain reaction liquid, and performing aftertreatment on the reaction liquid to obtain the hydrogenated xylylene diisocynate. The preparation method of the hydrogenated xylylene diisocynate has the advantages of complete ammonium salt formation, small grain size of the ammonium salt, low viscosity of the ammonium salt, high space-time conversion rate of photochemical reaction, simple process, low cost and the like.
Owner:HUNAN HAILI CHEM IND
Production method for 2 or multi-halohydrocarbon crosslinked polybenzimidazole crosslinked membrane
The invention relates to a preparation method of a polybenzimidazole crosslinking membrane that is crosslinked with bihalohydrocarbon or polyhalohydrocarbon, which takes amino dibasic acid and aromatic tetraamine as monomer raw material and polyphosphoric acid as reaction medium and reaction is carried out for 5-30 hours at 150-220 DEG C under the nitrogen protection condition so as to obtain homopolymer containing amino polybenzimidazole, and takes the amino dibasic acid, nonaminonic dibasic acid and the aromatic tetraamine as the monomer raw materials to prepare copolymer containing amino polyphosphoric under the same conditions. The prepared homopolymer and the copolymer of the polybenzimidazole have good dissolvability in solvents of dimethyl sulphoxide, N, N-dimethylacetamide, phosphate, vitriol and methane-sulforic acid, etc. Both the structures of the homopolymer and the copolymer of the polybenzimidazole contain amino that can be used for crosslinking. The bihalohydrocarbon or the polyhalohydrocarbon is used as cross linking agent. The polybenzimidazole crosslinking membrane with good property can be prepared through crosslinking reaction of the amino contained in the polybenzimidazole and the bihalohydrocarbon or the polyhalohydrocarbon.
Owner:SHANGHAI JIAO TONG UNIV
Liquid crystal alignment agent and liquid crystal display unit
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).
Owner:JSR CORPORATIOON
Cross-linked polyimide membranes
InactiveCN101678286AGuaranteed permeabilityGood solvent resistanceMembranesDispersed particle separationCross-linkFiltration
Owner:EVONIK FIBERS
Chemical separating method for aluminum foil in waste lithium ion battery positive plate
ActiveCN102412430AImprove solubilityLoose surface compositionSolid waste disposalWaste accumulators reclaimingActive agentEngineering
The invention discloses a chemical separating method for an aluminum foil in a waste lithium ion battery positive plate. The method comprises the following steps of: (1) adding the waste lithium ion battery positive plate into a surfactant solution, performing ultrasonic oscillation treatment to loosen surface components of the positive plate, washing, drying, filtering and recovering the positive plate; (2) putting the positive plate treated in the step (1) into a mixed solution of N, N-dimethylacetamide and N-methylpyrrolidone, heating, taking the positive plate out, and washing with water; (3) putting positive plate treated in the step (2) into water, performing ultrasonic oscillation till the aluminum foil as well as active substances of an anode, a conducting agent and a bonding agent; and (4) filtering a solution obtained in step (3), washing to obtain a mixture containing the active substances, the conducting agent, the bonding agent and the aluminum foil, and screening to obtain a dissociative aluminum foil sheet. In the method, the aluminum foil sheet can be recovered directly; and compared with the conventional method for extracting an aluminum foil after dissolving with alkali, the chemical separating method has the advantages: the process is simplified, and cost is lowered.
Owner:GUANGDONG BRUNP RECYCLING TECH +1
Ultrathin Ni-Fe-MOF nanosheet, preparation method and application thereof
ActiveCN109267093AEasy to operateShort reaction timeNickel organic compoundsNanotechnologyN dimethylformamideIron salts
The invention discloses a preparation method of an ultrathin Ni-Fe-MOF nanosheet. The preparation method comprises the following steps of dissolving an organic ligand in an organic solvent, dripping the obtained solution into a water solution with nickel and iron salts dissolved, mixing uniformly, then reacting for 3-6 hours at 140-160 DEG C, so as to obtain the ultrathin Ni-Fe-MOF nanosheet, wherein the organic ligand is p-phthalic acid and / or disodium terephthalate, and the organic solvent is N,N-dimethylacetamide and / or N,N-dimethylformamide. The invention further discloses the ultrathin Ni-Fe-MOF nanosheet and application thereof. The preparation method needs no surfactant, and can synthesize a large quantity of 2D ultrathin MOF material. The product has a clean surface and is easy toclean.
Owner:SUZHOU UNIV
High-performance flat plate type cellulose acetate/nano-titanium dioxide blended forward osmosis membrane
ActiveCN104474920AControl performancePollution resistantSemi-permeable membranesCellulose acetateN-Methyl-2-pyrrolidone
The invention discloses a high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane, which is prepared by comprising the following steps: adding the following raw materials in percentage by weight: 7.0%-26.0% of cellulose acetate, 2.0%-16.0% of additives, 0.1%-5.0% of nano-titanium dioxide, 0.05%-0.1% of graphene, and a dimethylformamide or dimethylacetamide, N-methylpyrrolidine and acetone mixed solvent into a dissolving tank according to certain sequence, stirring and dissolving for 3-15h to be full and even at 25-90DEG C, thus obtaining blended forward osmosis membrane casting liquid; and preparing the high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane on a supporting material by using a phase conversion method. According to the prepared forward osmosis membrane, 1M NaCl and deionized water are respectively taken as driving liquid and feed solution, the flux of pure water can reach more than 17.5L / m<2>.h during testing time of1h and the backward salt flux is less than 3.0g / m<2>.h.
Owner:UNIV OF JINAN
Synthesis method for terpolymer block silicone oil
ActiveCN103214676ANo demulsification and delaminationNo self-emulsifying propertiesSilicon organic compoundsFibre treatmentDisiloxaneEpoxy
Owner:ZHEJIANG JIEFA TECH
Method for preparing continuous carbon fiber-reinforced thermoplastic resin composite material
The invention discloses a method for preparing a continuous carbon fiber-reinforced thermoplastic resin composite material, which comprises the following steps: mixing N,N-dimethylacetamide and acetone at the mass ratio of (1-5):1 to obtain mixed solvent; dissolving 1-5 parts by weight of polyether sulfone into 30-60 parts by weight of mixed solvent to be fully dissolved so as to obtain polyethersulfone solution; adding 0.5-2.5 parts by weight of indissolvable thermoplasticity powdered resin into the polyether sulfone solution by mechanical stirring or ultrasonic vibration to obtain suspension with stable performance, wherein the added thermoplasticity resin powder is evenly distributed; dipping the continuous carbon fiber into mixed thermoplasticity resin suspension at the temperature of 18-22DEG C to obtain prepreg; and carrying out hot pressing and shaping to the prepreg to obtain a product. The method for preparing the continuous carbon fiber-reinforced thermoplastic resin composite material has the advantages of low cost, simple technology and small solvent toxicity.
Owner:SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
Method for producing polybenzimidazole crosslinked membrane with epoxy compound
The invention relates to a method for preparing a polybenzimidazole crosslinking membrane by using epoxy compounds, which takes amino dibasic acid and aromatic tetraamine as monomer raw material and polyphosphoric acid as reaction medium and reaction is carried out for 5-30 hours at 150-220 DEG C under the nitrogen protection condition so as to obtain homopolymer containing amino polybenzimidazole, and takes the amino dibasic acid, nonaminonic dibasic acid and the aromatic tetraamine as the monomer raw materials to prepare copolymer containing amino polyphosphoric under the same conditions. The prepared homopolymer and the copolymer of the polybenzimidazole have good dissolvability in solvents of dimethyl sulphoxide, N, N- dimethylacetamide, phosphate, vitriol and methane-sulforic acid, etc. The bifunctionality or polyfunctional epoxy compounds are used as cross linking agent. The polybenzimidazole crosslinking membrane that has good property can be prepared through crosslinking reaction of the amido contained in the polybenzimidazole and epoxy functional groups contained in the bifunctionality or polyfunctional epoxy compounds.
Owner:SHANGHAI JIAO TONG UNIV
Process for the preparation of non-hygroscopic azithromycin dihydrate
An improved process for preparing non-hygroscopic Azithromycin dihydrate wherein Azithromycin monhydrate can be converted to Azithromycin dihydrate with continous stirring / agitation in presence of a mixture of at least one solvent and water until non-hygroscopic crystals of Azithromycin dihydrate are obtained. The solvent used in the process can be selected from the group comprising dimethylformamide, dimethylacetamide, acetonitrile and iso-propanol.
Owner:ALEMBIC LTD
Cellulose acetate/functionalized graphene mixed media hollow fiber positive osmotic membrane
InactiveCN104906966AImprove performanceImprove hydrophilicitySemi-permeable membranesFiberLithium chloride
The invention discloses a cellulose acetate / functionalized graphene mixed media hollow fiber positive osmotic membrane. 0.05-3.0% (w / w) of graphene is added into a solution composed of N-methyl-pyrrolidone or dimethylacetamide or dimethylformamide and 1,4-dioxane, 2.0-20.0% (w / w) of a polyethylene glycol or polyvinylpyrrolidone / lithium chloride composite additive with a volume ratio of 7:1 is added, stirring is carried out for 15-60min, then 10.0-35.0% (w / w) of cellulose acetate is added, stirring is carried out, the mixture is allowed to stand, and a casting film solution. The casting film solution is squeezed into an annular gap of a nozzle, goes through an air gap of 2-20cm, and goes into deionized water with a temperature of 20-60 DEG C, solidification is carried out, and a positive osmotic membrane is obtained after washing. When 1M of NaCl is employed as a drive liquid and deionized water is employed as a raw material liquid, the water flux is 18.3L / m2h, the reverse salt flux is less than 3.3g / m2h, and the contact angle is 57.5 degrees.
Owner:UNIV OF JINAN
Separation-material composition for photo-resist and manufacturing method of semiconductor device
InactiveUS20040038154A1Semiconductor/solid-state device manufacturingPhotomechanical coating apparatusResistPolymer chemistry
One example of a separation-material composition for a photo-resist according to the present invention comprises 5.0 weight % of sulfamic acid, 34.7 weight % of H2O, 0.3 weight % of ammonium 1-hydrogen difluoride, 30 weight % of N,N-dimethylacetamide and 30 weight % of diethylene glycol mono-n-buthyl ether. Another example of a separation-material composition for a photo-resist according to the present invention comprises 1-hydroxyethylidene-1, 3.0 weight % of 1-diphosphonic acid, 0.12 weight % of anmonium fluoride, 48.38 weight % of H2O and 48.5 weight % of diethylene glycol mono-n-buthl ether. The separation-material composition for the photo-resist is mainly used for a medicinal liquid washing liquid / scientific liquid in order to remove the photo-resist residuals and the by-product polymer after an ashing process of a photo-resist mask. It can propose a separation-material composition for a photo-resist such that the photo-resist residuals and the by-product polymer are easily removed after a dry etching process and at the same time the low dielectric-constant insulation film is avoided from erosion and oxidization.
Owner:EKC TECH +1
Pharmaceutical composition
InactiveUS20050220881A1High dissolution rateImproves dissolution and dissolution rateBiocidePowder deliveryPolyethylene-polypropylene glycolPharmacology
The present invention provides a composition including an association complex of a pharmaceutical composition and one or more polyethylene-polypropylene glycol block co-polymers (poloxamers). The pharmaceutical composition may include a member selected from the group consisting of (a) an association complex of an eprosartan composition including eprosartan or a pharmaceutically acceptable salt of eprosartan and (b) the non-zwitterionic compound 2-(7-chloro-5-methyl-4-oxo-3-phenyl-4,5 dihydro-3H-pyridazino (4,5-b)indol-1-yl)-N,N-dimethylacetamide (NZ).
Owner:BVM HLDG
Graphene modified polyimide-based composite and preparation method thereof
ActiveCN102911360AImprove conductivityImprove mechanical propertiesDiaminodiphenyl etherComposite film
The invention discloses a graphene modified polyimide-based composite which is characterized in that the graphene modified polyimide-based composite comprises the following components in parts by weight: 95-105 parts of 4,4'-diaminodiphenyl ether, 110-120 parts of pyromellitic dianhydride and 1-25 parts of graphene. A preparation method comprises the steps of weighing ODA (octyl decyl adipate) and the graphene in proportion, measuring a DMAC (dimethylacetamide) solvent, adding the ODA, the graphene and the DMAC solvent to a reaction vessel, using ultrasonic till the ODA is dissolved sufficiently and the graphene is dispersed completely in the DMAC to obtain a graphene suspension, adding PMDA (pyromellitic dianhydride) in batches under high-speed stirring conditions till weak pole climbing appears, continuing to stir to allow diamine to react with dianhydride completely, and flattening an obtained graphene / PAA (poly acrylic acid) complex to obtain a composite film with uniform thickness so as to obtain a graphene polyimide composite film. The composite is 0.5 g / cm<3>-1.5 g / cm<3> in density and 60-170 KJ / m<2> in tensile strength.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Cellulose-polyacrylonitrile composite fiber and its production process
ActiveCN101240467AReduce lossLow costFilament/thread formingConjugated cellulose/protein artificial filamentsCelluloseOrganic solvent
The invention relates to a cellulose-polyacrylonitrile composite fiber and a manufacturing method of the same, the inventive method is characterized in that the composite fiber is a bending type or sheath-core type, the mass ratio of cellulose and polyacrylonitrile is 1:99 to 80:20 in the cortex of bending type or sheath-core type, the core layer of sheath-core type is made of the cellulose or polyacrylonitrile; the manufacturing method is that a ionic liquid is a solvent, also the organic solvent is a cosolvent, the organic solvent includes one or more N-N-dimethylacetamide, N-N-dimethylformamide or dimethyl sulfoxide. The bending type or sheath-core type composite fiber is formed after deairing, filtering, spinning, freezing, drawing, washing, drying and other steps, the fiber has a microporous structure which endows the characteristic of moisture absorption, breathable, coloring, good health, and other because of the moisture absorption of cellulose and the semi-compatibility of polyacrylonitrile; the ionic liquid is used in the production process being more green environmental protection.
Owner:CHINESE TEXTILE ACAD
Catalytic system for cellulose acylation process for producing said catalytic system, and for its practical application
InactiveUS6407224B1Reduce the degree of polymerizationExtended durationSugar derivativesOrganic-compounds/hydrides/coordination-complexes catalystsAcetic acidCellulose
A catalytic system for cellulose acylation includes an adduct of sulfuric acid with N,N-dimethylacetamide, free sulfuric acid or free N,N-dimethylacetamide with the following mole ratio of the components: adduct:1.0; free sulfuric acid, max:0.49; or free N,N-dimethylacetamide, max:0.4. A process for producing such a catalytic system is based upon reacting sulfuric acid with N,N-dimethylacetamide in an anhydrous medium at a temperature of 0° C.-25° C. with the following mole weight ratio of the components: sulfuric acid:1.0; N,N-dimethylacetamide, max:1.4. A process for cellulose acylation in the presence of this catalytic system incorporates cellulose treatment with acetic acid followed by treatment of the resultant activated cellulose with a lower fatty acid anhydride at a temperature of 10° C.-90° C. in the presence of this catalytic system taken in an amount of 1.5-30.0 wt. % of the cellulose weight in terms of sulfuric acid, a weight ratio of the liquid phase and cellulose being 3-7:1, respectively.
Owner:NAUCHNO PROIZVODSTVENNAYA FA EFIRY TSELLJULOSY
Pharmaceutical formulations of meloxicam
This invention is a novel pharmaceutical formulation of aqueous EDTA (Ethylene diamine tetraacetic acid) free solution of meloxicam in combination with meglumin for administration by oral or parenteral route, comprising one or more pharmaceutically acceptable excipients which is comprising N,N dimethylacetamide and propylene glycol for treating mammals, preferably animals.
Owner:SANOVEL ILAC SANAYI & TICARET ANONIM SIRKETI +1
Super hydrophobic modification method for polyvinylidene fluoride hydrophobic membranes
InactiveCN102179188AImprove throughputHigh desalination rateSemi-permeable membranesComposite filmGlass sheet
The invention discloses a super hydrophobic modification method for polyvinylidene fluoride hydrophobic membranes and belongs to the technical field of membrane separation. The method comprises: preparing membrane casting solution by using polyvinylidene fluoride (PVDF), N,N-dimethylacetamide (DMAC) serving as a solvent and non-solvent low-molecular-weight alcohol and aging the membrane casting solution to form upper membrane solution; preparing membrane casting solution by using PVDF, DMAC, LiCl or / and polyvinyl pyrrolidone (PVP), and aging the membrane casting solution to form lower membrane solution, wherein the PVDF content in the lower membrane solution is higher than that in the upper membrane solution; scraping the lower membrane solution and the upper membrane solution on a glass plate in turn, and placing the glass plate in air at 50 to 75 DEG C and at a water relative humidity of 80 to 100 percent to obtain a primary ecological membrane; and immersing in running water for stripping the membrane and drying to obtain a polyvinylidene fluoride composite film of which the surface is super hydrophobic. In the invention, the method is simple, the process flow is short, the cost is low, and the prepared membrane has high flux and high salt rejection rate.
Owner:BEIJING UNIV OF TECH
Preparation method of metformin hydrochloride
ActiveCN103435518AHigh recovery rateImprove securityOrganic chemistryOrganic compound preparationMetformin hclPharmacology
The invention discloses a preparation method of metformin hydrochloride. The preparation method is characterized by using dicyandiamide and dimethylamine hydrochloride as raw materials, feeding the materials in a mole ratio of (1:1)-(1:1.2), using N,N-dimethylacetamide or dimethyl sulfoxide 2-4 times dicyandiamide by weight as a solvent, and reacting for 4-8 hours at 140+ / -5 DEG C to prepare a crude metformin hydrochloride product; recrystallizing the crude product with ethanol, regulating the pH value to be 5-6, decoloring the crystal, cooling the crystal to minus 10-0 DEG C while stirring, precipitating the crystal, obtaining a refined metformin hydrochloride product through filtering and drying, and recovering the solvent from filtrate. The qualified product has yield of 80-85% and high purity. The preparation method has the advantages that as the selected reaction solvent has a relatively high boiling point, the recovery rate of the solvent is high; the phenomenon of material surging can be effectively avoided, so that the preparation method has the advantages of mild reaction conditions, simplicity in operation and high safety.
Owner:QINGDAO HUANGHAI PHARM CO LTD
Harmless dimethylacetamide wastewater treatment method
InactiveCN103359876ALow biological toxicityImprove biodegradabilityWater contaminantsMultistage water/sewage treatmentElectrolysisTreatment effect
The invention relates to a harmless dimethylacetamide wastewater treatment method which comprises the following steps of: (1) regulating the pH of wastewater in a regulating reservoir; (2) performing pretreatment in an iron carbon-Fenton oxidation pond; (3) performing flocculating sedimentation treatment; (4) adding a carbon source to perform hydrolytic acidification treatment; (5) performing anaerobic biochemical treatment in a primary upflow anaerobic sludge blanket (UASB) reactor; (6) performing anaerobic treatment in a secondary UASB (Upflow Anaerobic Sludge) reactor; (7) treating in an aerobic pond; (8) performing mud-water treatment in a secondary sedimentation tank to drain water. An aerated micro electrolysis method, a Fenton oxidation method and a biological method are combined; moreover, a good wastewater treatment effect is kept, the treatment cost is reduced, and the harmless dimethylacetamide wastewater treatment method has the obvious characteristics of high organic matter removal efficiency, stable effluent quality, low engineering investment, low energy consumption and the like, and is easy to popularize and apply.
Owner:苏州有色金属研究院有限公司
Carboxylation graphene oxide/polyvinylidene fluoride compiste ultrafiltration membrane and preparation method thereof
InactiveCN104028115AThe film surface contact angle decreasesImprove hydrophilicitySemi-permeable membranesPhosphoric acidGraphite oxide
The invention discloses a carboxylation graphene oxide / polyvinylidene fluoride compiste ultrafiltration membrane and a preparation method thereof. The carboxylation graphene oxide / polyvinylidene fluoride compiste ultrafiltration membrane is prepared by firstly, ultrasonically dispersing carboxylation graphene oxide in double solvents consisting of dimethylacetamide and triethyl phosphate, subsequently mixing with polyvinylidene fluoride, regulating the temperature to be 50-60 DEG C, mechanically stirring for dissolving, cooling to the room temperature, scraping a glass plate to form a membrane, soaking in deionized water for 3-5 days, and naturally drying in air, so as to obtain the carboxylation graphene oxide / polyvinylidene fluoride compiste ultrafiltration membrane. The carboxylation graphene oxide / polyvinylidene fluoride compiste ultrafiltration membrane disclosed by the invention is relatively good in hydrophilia and mechanical strength. The preparation method has the characteristics of simplicity, environment friendliness, easiness in condition control, short preparation period and the like.
Owner:SHANGHAI INST OF TECH
Preparation of polyimide film
The invention discloses a preparation method of a polyimide film, which relates to a preparation method of a high molecular polymer film. The invention aims at providing a synthesis method of a polybenzoxazole imide film containing a single oxazole ring, which solves the problem of poor film forming ability of polybenzoxazole imide containing a dual oxazole ring under a condition without sacrificing the thermal property of a polymer. The method includes the following steps: firstly, 5-amido-2-(phenetidine)benzoxazole and N, N'-dimethylacetamide are mixed and stirred and added with aromatic dianhydride and then a polyamide acid is obtained after reaction is finished; secondly, the polyamide acid prepared in the first step is casted into film and dried; thirdly, heat treatment is carried out; and fourthly, the polyimide film is obtained through water boiling and stripping. The polyimide film prepared by the method is good in thermal property, strong in acid resistance and high in mechanical property. The preparation method is simple and has good film forming performance.
Owner:HARBIN INST OF TECH
Preparation method of nano-cellulose aerogel
The invention discloses a preparation method of nano-cellulose aerogel and relates to the preparation method of the nano-cellulose aerogel. The preparation method aims at solving the problem of poor dispersion of the existing cellulose aerogel in an organic solvent. The preparation method comprises the following steps: 1) dissolving absorbent cotton in a sulfuric acid solution for acidolysis, centrifugalizing, and then washing a white sol precipitate with deionized water to be neutral; 2) adding the nano-cellulose sol precipitate into the organic solvent, uniformly stirring, and then placing into an ultrasonic cleaning instrument for ultrasonic dispersion; and 3) placing a nano-cellulose suspension at the temperature of minus 18-minus 25 DEG C for freezing, and then further placing into a freeze-drying machine for freeze-drying. The nano-cellulose aerogel prepared by the invention has obvious nano-microfibril and nano-porous structure and can be rapidly dispersed in the organic solvent, such as dimethylformamide, dimethylacetamide and the like, the particle size of dispersed cellulose is nano-scale, and the good dispersion is shown. The preparation method disclosed by the invention can be applied to catalyst carriers, adsorbents and other fields.
Owner:NORTHEAST FORESTRY UNIVERSITY +1
Oceanic heavy corrosion resistant self-stratifying coating
ActiveCN103525284AImprove anti-corrosion performanceStrong adhesion between layersAnti-corrosive paintsPolyurea/polyurethane coatingsEpoxyZinc phosphate
The invention discloses an oceanic heavy corrosion resistant self-stratifying coating which is prepared by using a conventional preparation process under the coordination of all functional auxiliaries including epoxy resin-44 and fluorocarbon resin HFS-F-3000 as base stocks, Basf isocyanate as a curing agent, N-dimethylacetamide and dimethylbenzene as solvents, polyethylene glycol 600 as a dispersing agent and ferric oxide and zinc phosphate as pigments. The oceanic heavy corrosion resistant self-stratifying coating has favorable corrosion resistance and strong interlayer adhesion, and can be used for realizing one-step industrial coating, reducing processes, lowering cost and greatly increasing the actual production efficiency.
Owner:SHANDONG UNIV OF SCI & TECH
Cross-linked polyimide membranes
InactiveUS20100181253A1Maintain permeabilityGood solvent resistanceMembranesDispersed particle separationCross-linkFiltration
The present invention provides a method for improving the performance of polyimide membranes as used in solvent-resistant nanofiltration. More specifically the method of the present invention allows to improve the solvent stability of the polyimide membranes to solvents or solvent mixtures that would dissolve polyimide under the conditions applied during the filtration, such as dimethylforrnamide (DMF), N-methylpyrrolidinone (NMP), dimethylacetamide (DMAC), tetrahydrofuran (THF), y-butyrolacton (GBL), dimethylsulphoxide (DMSO) and chlorinated solvents.
Owner:EVONIK FIBERS
High-dielectric constant low-loss metal/polymer composite and preparation method thereof
InactiveCN102702652AImprove frequency stabilityImprove temperature stabilityMagnetic tension forceUltrasonic dispersion
The invention relates to a high-dielectric constant low-loss metal / polymer composite and a preparation method thereof. According to the invention, self-passivating metal Al powder with average particle size of 800 nm is treated by a silane coupling agent, then uniformly mixed with N, N-dimethylacetamide (DMAC) solution of polyvinylidene fluoride (PVDF) by magnetic stirring and ultrasonic dispersion, coated on clean glass plates to form films, and then dried in vacuum at 80 degrees centigrade for 2 h to remove solvent so as to obtain Al / PVDF composites with thickness of 30-80 microns; wherein dosage of Al is 10-50% of PVDF by volume percent. The Al / PVDF composite provided by the invention has a dielectric constant higher than 58 under a frequency of 1 kHz at room temperature, and a dielectric loss lower than 0.02; the dielectric constant is linearly increased along with increment of Al content, so that the dielectric constant can be randomly regulated within certain range according to the need; at the same time, the dielectric constant is good in temperature and frequency stability.
Owner:NANCHANG HANGKONG UNIVERSITY
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