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35402results about How to "Mild reaction conditions" patented technology

Preparation method of metal organic framework based composite phase-change material

The invention relates to a preparation method of a metal organic framework based composite phase-change material. The method comprises the steps that a metal organic framework material substrate is prepared selectively; hole diameter size design and hole channel polarity regulation and control are performed on the substrate according to the size and the kind of a core material, so that a phase-change core material to be loaded is matched better; the soluble phase-change core material is prepared into a solution; a metal organic framework material is dispersed in the prepared phase-change material solution; a phase-change material is adsorbed by utilizing an extra-large specific surface area and a nano hole channel structure of the metal organic framework material; drying is performed; and then the metal organic framework composite phase-change material with a shaping effect is obtained. According to the method, a novel metal organic framework based composite phase-change material is developed; the prepared metal organic framework based composite phase-change material can effectively avoid leakage and the like, and has the advantages of adjustable nano hole structure and wide core material selection range; the method is simple in technology and mild in reaction condition, and is suitable for scale production; and a raw material is cheap and easy to obtain.
Owner:UNIV OF SCI & TECH BEIJING

Alicyclic-containing polyimide film and preparation method thereof

The invention relates to an alicyclic-containing polyimide film. The molecular structure general formula of the film is the right formula, wherein, -CA- is a bivalence connection group of an alicyclic dibasic primary amine, -Ar- is a bivalence connection group of an aromatic dibasic primary amine, and -R- is a bivalence connection group of an aromatic dibasic estolide. The preparation thereof includes: the alicyclic dibasic primary amine and the aromatic dibasic primary amine are dissolved in non-proton organic solvent with strong polarity, the aromatic dibasic estolide is added, the non-proton organic solvent with strong polarity is used for regulating the viscosity of the alicyclic-containing polyamic acid resin solution after reaction for 1-3 hours, forming is carried out in a curtain coating machine, and dehydration fever imidization, cooling and demoulding are carried out so as to obtain the film. The preparation method has mild reaction condition and low cost and is environmentally friendly; and meanwhile, the alicyclic-containing polyimide film has excellent mechanic property and heat resistant property and low water absorption, and the visible light transmission thereof is as high as more than 97%. The film has good application prospect in the fields of optical waveguide material, photorefractive material and photoelectric material in optical communication field and direct action membrane material in the liquid crystal display field and the like.
Owner:DONGHUA UNIV

Method for preparing fluorine-containing sulphonyl (phosphoryl) imine and alkali metal salt thereof

The invention provides a method for preparing fluorine-containing sulphonyl (phosphoryl) imine and fluorine-containing sulphonyl (phosphoryl) imine alkali metal salt. The method comprises the following steps: taking one or two or more than two of Lewis acid, perfluoro-alkyl sulfuryl fluoride and perfluoro-alkyl acyl fluoride as a catalyst, catalyzing anhydrous hydrogen fluoride to react with chlorine-containing sulphonyl (phosphoryl) imine in a high-pressure kettle and then obtaining the fluorine-containing sulphonyl (phosphoryl) imine by depressurization distilling; taking Lewis base as a catalyst, catalyzing the anhydrous hydrogen fluoride to react with the chlorine-containing sulphonyl (phosphoryl) imine, then acting with different alkali metal carbonate and obtaining the correspondingfluorine-containing sulphonyl (phosphoryl) imine alkali metal salt. Compared with the prior art, the method has the characteristics of simple operation steps, mild reaction conditions, low cost, easyseparation and purification of the product, high purity and yield and the like and is suitable for industrialized mass production.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Preparation method of core-shell structured synthetic polymer-natural polymer composite fiber

The invention discloses a preparation method of a core-shell structured synthetic polymer-natural polymer composite fiber, and the method comprises the steps of: (1) selecting one or several of synthetic polymers to dissolve in a solvent, and conducting stirring until complete dissolution; (2) selecting a natural polymer to dissolve in a solvent, or adding a spinning assistant, and carrying out stirring until complete dissolution; and (3) taking the solution prepared in step (1) as an outer tube spinning solution, adopting the solution prepared in step (2) as an inner tube spinning solution, injecting them into the inner tube and the outer tube of a coaxial spinneret, and performing coaxial electrospinning at room temperature. The core-shell structured nano-fiber prepared by the invention selects the synthetic polymer as the shell layer, and can inhibit water molecules from penetrating the natural polymer as the core layer. The natural polymer as the core layer can more effectively encapsulate active substances to avoid inactivation of the active substances in the presence of an organic solvent, so that the core-shell structured composite fiber can play a good drug sustained release role in the drug carrier field, and an integral activity can be maintained.
Owner:SHANGHAI JIAO TONG UNIV +1

Graphene/MoS2 compound nano material lithium ion battery electrode and preparation method thereof

The invention discloses a graphene / molybdenum disulfide (MoS2) compound nano material lithium ion battery electrode and a preparation method thereof. The electrode comprises the following components in percentage by mass: 75 to 85 percent of compound nano material serving as an active substance, of a graphene nano slice and MoS2, and 5 to 10 percent of acetylene black and 10 percent of polyvinylidene fluoride; and the mass ratio of the graphene nano slice to the MoS2 nano material in the compound nano material active substance is (1 to 1)-(4 to 1). The preparation method of the electrode comprises the following steps of: preparing an oxidized graphite nano slice by using graphite as a raw material by a chemical oxidization method; synthesizing by a one-step hydrothermal in-situ reduction method in the presence of the oxidized graphite nano slice to obtain a graphene nano slice / MoS2 compound nano material; and finally, preparing the electrode by using the graphene nano slice / MoS2 compound nano material as the active substance. The electrode has high electrochemical lithium storage reversible capacity and cyclic stabilization performance, and can be widely applied to new generation lithium ion batteries.
Owner:ZHEJIANG UNIV

Full aromatic fluorine containing transparent polyimide film and preparation method thereof

The invention relates to a full aromatic fluorine containing transparent polyimide film. Structural formula of molecule thereof is shown above, wherein -R1 is a divalent residue of fluorine containing aromatic binary primary amine, and -R2 is a divalent connecting group of aromatic binary anhydride molecule. The preparation method thereof comprises steps of adding the fluorine containing aromatic binary primary amine and strongly polar non-protonic organic solvent into a polymerizing bottle, stirring at room temperature, after being completely dissolved, adding the aromatic binary anhydride, stirring, after 3 hours reaction, obtaining transparent and thick fluorine containing aromatic polyamide acid resin solution having homogeneous phase; and using the strongly polar non-protonic organic solvent to regulate viscosity of the fluorine containing aromatic polyamide acid resin solution, forming film, heating, carrying out dehydrating hot-imidization reaction, cooling, demoulding, thus obtaining the full aromatic fluorine containing transparent polyimide film. The preparation method has mild reaction condition, simple operation and low cost and is environment friendly. The full aromatic fluorine containing transparent polyimide film has excellent mechanical property and heat tolerance and visible light transmission thereof is up to 95%.
Owner:DONGHUA UNIV

Super-hydrophobic nanometer transparent coating and preparation method thereof

The invention provides a super-hydrophobic nanometer transparent coating and a preparation method thereof and belongs to the technical field of super-hydrophobic paint. The method includes the steps that firstly, a first category of inorganic nanometer particles are added into an organic solution, and ultrasonic dispersion is performed; secondly, dispersing agents and a second category of inorganic nanometer particles are added, and ultrasonic dispersion is performed so that a dispersion solution can be obtained; crosslinking agents and additives are added in the dispersion solution, ultrasonic dispersion is performed, finally, low-surface energy polymers are added, mixtures are evenly mixed, and transparent and clear super-hydrophobic paint is obtained; the surface of a solid base materials is coated with the transparent and clear super-hydrophobic paint, and the super-hydrophobic nanometer transparent coating is obtained through low-temperature thermal drying and curing. The super-hydrophobic performance of the super-hydrophobic nanometer transparent coating prepared through the method is excellent, the contact angle can be 160 degrees, the rolling angle is 1-7 degrees, the super-hydrophobic nanometer transparent coating can be sprayed to the surfaces of most of common materials, the morphology of the surfaces of the materials are not changed, and the application prospects and the application potency are very wide.
Owner:BEIHANG UNIV

Preparation method of thermal conduction enhanced metal organic framework gas storage material

The invention relates to a preparation method of a thermal conduction enhanced metal organic framework gas storage material and belongs to the field of nanocomposites. The preparation method comprises the following steps: firstly selectively preparing a metal organic framework material with a large surface area and a high micropore proportion; performing synthesis post-modification on the metal organic framework material by a 'one-pot' method, regulating the polarity and contained functional groups of pores, immobilizing metal nanoparticles inside the pores to enhance the thermal conduction property of the metal organic framework material; adsorbing industrial gas by utilizing the ultra-large specific surface area and the nano duct structure of the metal organic framework material, wherein the thermal conduction enhanced adsorption material can be used for quickly transmitting the heat generated in the adsorption and desorption process of the industrial gas. The metal organic framework industrial gas adsorber prepared by the invention can be used for efficiently adsorbing and desorbing the industrial gas and effectively improving the thermal conduction property of the adsorber, and avoiding the influence of the heat effect on the adsorption quantity in the adsorption and desorption process. The preparation method provided by the invention has the advantages of use of readily available and inexpensive raw materials, simple process, and mild reaction conditions and is suitable for large-scale production.
Owner:UNIV OF SCI & TECH BEIJING

Method for preparing large-size high-quality graphene with controllable number of layers

The invention discloses a method for preparing large-size high-quality graphene with controllable number of layers, wherein graphite powder or flake graphite is mainly adopted as a raw material. The method specifically comprises the steps of intercalating the graphite raw material by virtue of an intercalating agent to initially weaken the intercalation interaction force and obtain different orders of graphite intercalation compounds (GICs); soaking the GICs in an appropriate expander, and then under the case that an auxiliary agent is added or not, enabling the intercalation materials to be quickly reacted with the expander to release a gases to obtain highly expanded wormlike graphene aggregate and further to cause the distances among graphene lamellar layers to be increased; and after certain processing, peeling, and then repeatedly centrifuging and dispersing to obtain a graphene dispersion with different numbers of layers. According to the method disclosed by the invention, the intercalation-expansion-peeling process is involved, raw materials are cheap, the reaction process is simple and easily controlled, and the number of layers of graphene is precisely controlled; the obtained graphene lamellar layers have the advantages of few defects, large size, high conductivity, high yield and the like, the large-scale industrial production is easily implemented, and the problems of high cost, low productivity, poor quality, small size, uncontrollable number of layers and the like in an existing graphene preparation technology are solved.
Owner:安徽百特新材料科技有限公司

Compound nano material of graphene and MoS2 and preparation method thereof

The invention discloses a compound nano material of graphene and molybdenum disulfide (MoS2) and a preparation method thereof. The compound material is formed by mixing graphene and a MoS2 nano material in a mass ratio of (1 to 1)-(4 to 1). The preparation method comprises the following steps of: preparing an oxidized graphite nano slice from graphite by a chemical oxidization method; then dissolving molybdate into deionized water so as to form 0.02 to 0.07M of solution; adding L-cysteine serving as a sulfur source and a reduction agent, wherein the mass ratio of the L-cysteine to the molybdate is (5 to 1)-(12 to 1); adding the oxidized graphite nano slice into the solution, and ultrasonically treating so that the oxidized graphite nano slice can be fully dispersed in the hydrothermal reaction solution; transferring the mixture into a hydrothermal reaction kettle and sealing; and synthesizing by a one-step hydrothermal method to obtain the compound nano material of graphene and MoS2, wherein the mass ratio of the graphene nano slice to the MoS2 is (1 to 1)-(4 to 1). The method has the characteristics of mild reaction condition and simple process. The compound nano material of graphene and MoS2 synthesized by the method can be widely used as electrode materials of new energy batteries, high-performance national lubricants, catalyst carriers and the like.
Owner:ZHEJIANG UNIV
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