42results about How to "Retain conductivity" patented technology

The invention relates to a synthetic method of a graphene-waterborne epoxy high-dispersion system. The method comprises steps as follows: step 1, glycidyl ether type epoxy resin and double-end amino micromolecular amine are subjected to an addition chain extension reaction, and an amino-terminated hydrophilic polyether chain segment is obtained; step 2, the amino-terminated hydrophilic polyether chain segment and a macromolecular epoxy group are subjected to an addition chain extension reaction, and an amino-terminated long-chain non-ionic self-emulsifying epoxy curing agent is obtained; step 3, low-oxidation graphene is prepared with an ultrasonic assisted Hummers method; step 4, the non-ionic self-emulsifying epoxy curing agent and low-oxidation graphene are subjected to a covalent grafting modification reaction, and the graphene-waterborne epoxy high-dispersion system is obtained. The synthetic method has the advantages as follows: the long-chain non-inoic self-emulsifying epoxy curing agent is grafted on the surface of graphene through a nucleophilic opening ring reaction, re-agglomeration of a graphene sheet layer is inhibited to a certain extent, the electric conductivity of graphene is retained, and the comprehensive mechanical performance and modulus of the graphene-waterborne epoxy high-dispersion system are improved effectively.

The invention discloses a preparation method for a low-density porous metal material. The preparation method is characterized by comprises the following steps: according to mass percent, taking raw materials of 70-95% of metal elementary substance powder, 5-10% of polyvinyl alcohol and 0-20% of polystyrene microsphere; preparing the polyvinyl alcohol into a polyvinyl alcohol aqueous solution with the mass percent concentration of 5-10%; adding the polystyrene microsphere into the polyvinyl alcohol aqueous solution, adding the metal elementary substance powder, stirring and mixing uniformly to obtain a pulp material; pouring the pulp material into a tubular pillar polytetrafluoroethylene tube mould, freezing, drying, molding and demoulding; placing a dried material into a pipe furnace with flowing inert atmosphere, and sintering at the temperature of 400-500 DEG C for 2-6 h to obtain the low-density porous metal material. The porous metal prepared by the preparation method has a relative density which can be as low as 5%; most part of the metal is through-hole; the hole diameters have the characteristic of bimodal distribution; the poriness and the microstructure are uniform and adjustable, and a certain mechanical strength is achieved.

The invention provides graphene-molybdenum disulfide composite conductive paste for lithium battery and a preparation method thereof. The method comprises the following steps of: blending a lithium ion or magnesium ion salt, molybdenum disulfide and graphite particles, heating at a high temperature, so that the lithium ion or magnesium ion is intercalated between the graphite and molybdenum disulfide layers; cooling to room temperature, fusing into a solvent, ultrasonically precrushing, thereby obtaining a mixture; ejecting the mixture through a jet nozzle of a high voltage pulse jet machine, and performing further crushing and stripping on the graphite and molybdenum disulfide by utilizing the mechanical shearing and high-speed collision effects of particles, thereby obtaining the graphene-molybdenum disulfide composite conductive paste. According to the composite conductive paste and the preparation method thereof provided by the invention, nanolayers can be effectively prevented from being stacked again, the surface area utilization rate of the electrode material is improved, and the electrical conductivity of the positive and negative poles of the lithium ion battery is greatly improved.

The invention discloses a preparation method for a polymer composite electrolyte membrane. The preparation method comprises the following steps: compounding a porous membrane containing a low-viscosity polymer electrolyte A solution and a high-viscosity polymer electrolyte B solution. The viscosity of the solution is controlled, and the polymer composite electrolyte membrane prepared by the preparation method has a high filling ration and low surface roughness, so that the comprehensive performances of the polymer electrolyte are greatly improved, and the application prospect is clearer.

The invention provides conductive coating for a plastic surface. The conductive coating for the plastic surface comprises the following components in parts by weight: 60 to 70 parts of water-based acrylic acid resin, 10 to 30 parts of water-based alkyd resin, 3 to 10 parts of modified graphene, 2 to 6 parts of sodium alginate, 1 to 3 parts of coupling agent, 6 to 12 parts of ethanol, 1 to 2 partsof polypyrrole nanometer fiber, 2 to 6 parts of ethylene-vinyl acetate copolymer, 0.6 to 2.4 parts of dispersing agent, 0.1 to 1 part of defoaming agent and 80 to 160 parts of deionized water, whereinthe modified graphene is mainly prepared from graphene, maleic acid, chitosan, zinc oxide, tin chloride and phenyl-methyl amine. The conductive coating for the plastic surface has excellent electricconductivity and also has high salt spray corrosion resistance.

Disclosed are a lithium-air battery and a method of manufacturing the same. The weight of the battery may be reduced and the energy density thereof may be improved by eliminating two separators, which are stacked on a gas diffusion layer and a current collector in the related art, and by using two kinds of gel polymer electrolyte membranes, each including a gelled polymer matrix impregnated with an electrolyte, as a separation membrane. The volatilization, leakage or bias of the electrolyte may be prevented by restricting the fluidity of the electrolyte. In addition, the capacity and lifespan of the battery may be increased.

The invention discloses a preparation method of a high-conductivity metal net load graphene current collector, and belongs to the field of batteries. A battery current collector comprises a metal netand a graphene material, wherein graphene is stably loaded on the metal net. The battery current collector has the performance of improving the conductivity due to the import of the graphene. The battery current collector provided by the invention has highly enhanced conductivity and is capable of enhancing the performance to a certain extent.

The invention discloses a flexible graphene conductive electrode, a preparation method, an application and a flexible bendable super-capacitor. The conductive electrode is prepared through following steps: (1) preparing a graphene thin sheet from a graphite material through an electronic intercalation-gas phase stripping method; and (2) preparing the flexible graphene conductive electrode from the graphene thin sheet in a manner of solution self-assembly. The flexible graphene conductive electrode has two-dimensional material performances of graphene materials, maintains a carbon-carbon lattice structure of a graphite flake and integrity of a planar electronic structure, retains a conductivity thereof, is free of a conductive agent for enhancing the performance thereof, can be directly used as an electrochemical energy storage apparatus, such as an cathode electrode and an electrode material in a super-capacitor, is free of addition of any additives and usage of a metal substrate, can reduce manufacturing cost of the electrochemical energy storage apparatus, and greatly increases energy density and power density of a lithium ion battery and the super-capacitor.

The invention provides conductive anticorrosive coating. The conductive anticorrosive coating comprises the following components in parts by weight: 65-75 parts of hydroxyl acrylic resin, 10-30 partsof epoxy resin, 1-3 parts of modified graphene, 4-8 parts of carbon nanotubes, 0.6-2.4 parts of a dispersing agent, 2-4 parts of a curing agent, 0.1-0.4 part of a preservative, 0.1-1 part of a defoaming agent and 80-160 parts of a solvent, wherein the modified grapheme is prepared mainly from graphene, citric acid, chitosan, conductive carbon black, tin chloride and phosphorus oxychloride; the preservative is a mixture of isothiazolinone and aluminum tripolyphosphate. The conductive anticorrosive coating not only has very good corrosion resistance, but also has improved adhesion.

The invention provides a preparation method of polyimide fiber far infrared emission paper, wherein the preparation method comprises the following steps: mixing polyimide fiber slurry, a carbon nanotube dispersion liquid, polyacrylate and cationic polyacrylamide to obtain mixed slurry; coating a single side of the substrate with the mixed slurry, curing, and forming a curing layer on the single side of the substrate; and peeling the substrate, and carrying out hot press molding of the obtained curing layer, to obtain the polyimide fiber far infrared emission paper. The polyimide and carbon nanotube slurry is coated, hot-pressed and molded, and the polyimide fiber far-infrared emission paper is obtained; not only are good electric conductivity and far-infrared emission performance of the carbon nanotubes retained, but also good mechanical properties of polyimide are retained. As a far-infrared emitter, the emission far-infrared wavelength is 4-18 [mu]m, and the conversion efficiency ofelectric energy radiation can reach 90% or more.

The invention belongs to the technical field of magnesium and lithium alloy surface treatment and particularly relates to a magnesium and lithium alloy surface compound oxidation treatment method. Themethod includes the steps that surface cleaning pretreatment is conducted on a magnesium and lithium alloy firstly; then the magnesium and lithium alloy is put into an electric conduction oxidation solution to generate an electric conduction oxidation film, and a special tool is adopted for protecting the position, wherein an electric conduction layer needs to be reserved, of the magnesium and lithium alloy; and then micro-arc oxidation treatment is conducted, micro-arc oxidation treatment is conducted with the magnesium and lithium alloy adopted as the anode and a stainless steel plate adopted as the cathode, a porcelain compact layer is formed, and an electric conduction oxidation micro-arc oxidation film coating is obtained. Local electric conductivity of a part is reserved due to theobtained coating, and meanwhile corrosion resistance is also greatly improved.

The invention discloses a preparation method of super-dispersed graphene, and belongs to the technical field of carbon materials. The preparation method comprises the following steps: mixing graphene,water and polystyrene sulfonate, freezing and squeezing to obtain primarily treated graphene; mixing the primarily treated graphene, absolute ethyl alcohol, a fatty acid and a titanate, performing heating reflux reaction, adding a surfactant and butanedinitrile, performing ball milling and mixing, washing and drying to obtain secondarily treated graphene; mixing the secondarily treated graphene with an adhesive, spin-coating an obtained mixture on the surface of a copper foil, performing high-temperature reaction with diborane, and cooling to obtain a copper foil/graphene composite material;and then carrying out electrochemical reaction by taking a sodium hydroxide solution as an electrolyte, platinum as an anode and the copper foil/graphene composite material as a cathode to separate the copper foil from the graphene, collecting the electrolyte, filtering, washing and drying to obtain the super-dispersed graphene. The product obtained by the invention has good dispersity and uniformity.

The invention discloses a packaging structure for a power MOSFET chip. The structure comprises the MOSFET chip which comprises a grid electrode and a source electrode on the front surface and a drainelectrode on the back surface, a first electric conductor which is electrically connected with the drain electrode on the back surface of the MOSFET chip, and a second electric conductor which is electrically connected with the source electrode on the front surface of the MOSFET chip through crimping packaging. A stress buffer area is arranged in the area, occupying the front surface of the MOSFETchip, of the source electrode, and the edge, making contact with the source electrode, of the second electric conductor is located in the stress buffer area. The part, corresponding to the stress buffer area, of the MOSFET chip does not contain a cellular structure. By additionally arranging the stress buffer area on the source electrode of the MOSFET chip, the damage of the edge stress concentration of the second electric conductor to the cellular structure in the MOSFET chip can be remarkably reduced, and the compression resistance and the reliability of the MOSFET chip are greatly improved. Meanwhile, the double-sided heat dissipation capacity is reserved, which improves the power level of a device.

The invention provides a preparation method for improving performance of graphene conductive ink by using imidazole type ionic liquid. The preparation method is mainly characterized in that the imidazole type ionic liquid is utilized to improve the dispersibility of graphene in the ultrasonic blending process, and meanwhile, the ionic liquid has certain conductivity and can synergistically improvethe conductivity of the prepared graphene conductive ink. The preparation process comprises the steps of firstly dispersing epoxy resin and graphene in a solvent, and meanwhile, adding imidazole typeionic liquid to stir and ultrasonically treat for a certain time; and finally obtaining a series of graphene conductive ink with excellent conductivity by adjusting the proportion of various substances. According to the method provided by the invention, excessive treatment on graphene is not required, and a series of graphene conductive inks with different conductive performances are finally obtained by adjusting the dosage of the imidazole type ionic liquid. The preparation process has the advantages of being relatively simple in process, suitable for various matrixes and the like.

The invention belongs to the technical field of display, and particularly relates to a quantum dot light emitting diode and a preparation method thereof. The quantum dot light-emitting diode comprisesan anode, a cathode and a quantum dot light-emitting layer located between the anode and the cathode, wherein an electron transport layer is further arranged between the cathode and the quantum dot light-emitting layer, and the electron transport layer is made of graphdiyne fluoride. The graphdiyne fluoride is applied to the electron transport layer of the quantum dot light-emitting diode device,thereby not only having the advantage of high electron transport efficiency, but also having high matching degree with the quantum dot light-emitting layer, and finally improving the light-emitting performance of the device.

The invention discloses a preparation method of a copper-steel composite material with an authigenic copper-rich layer on a steel surface. The problem about the bonding between the interfaces of a former externally added coating layer and a matrix is solved by means of spontaneously generating a copper-rich coating layer on the surface of a steel matrix. The preparation method comprises the following steps: corroding the surface of copper-containing steel, removing corrosion products, and treating the surface of the copper-steel composite material. According to the method, the copper-steel composite material with the copper-rich outer layer can be obtained without the means of externally adding a coating layer; as the coating layer is spontaneously generated by the matrix, the prepared copper-steel composite material does not have the problem about the bonding between the composite interfaces and the coating layer does not usually peel off; the prepared copper-steel composite material keeps not only the excellent properties such as high strength and good toughness of steel, but also the characteristics such as corrosion resistance and conductivity of copper; besides, the appearance of the composite material is attractive.