1096results about How to "Solve reunion" patented technology

The invention relates to a method for preparing graphene powder in large scale, which is characterized by comprising the following steps of: firstly, uniformly peeling graphene oxide into a graphene oxide suspension solution; then, atomizing the graphene oxide solution by using the spray drying technology comprising spray pyrolysis drying and spray freeze drying, and removing a solvent to obtain graphene oxide powder; and finally, oxidizing grapheme by using the non-expansion heat treatment process to obtain non-agglomerative graphene powder. The continuous preparation process of the spray technology and the non-expansion heat treatment process ensure the large-scale preparation of the graphene powder. The prepared graphene powder comprising intermediate product graphene oxide powder does not have agglomeration and has good dispersivity in the solvent. The graphene powder is used as a filling material to prepare high strength composite materials, conductive composite materials, novel air-tight flame-retardant composite materials, novel nanodevices and the like.

The invention relates to a high-strength and high-conductivity dispersion-strengthened alloy, which comprises a copper base, a ceramic dispersion-strengthening phase and a doping element, wherein the ceramic dispersion-strengthening phase may be one or several of ZrO2, Y2O3, MgO, Al2O3 and TiB2 which accounts for 0.1 to 2 mass percent of the copper alloy; and the doping element may be one or several of Ni, Y, Ag, Ti, Zr and Hf which accounts for 0.1 to 1 percent of the copper alloy. In the invention, the problems of ceramic particle agglomeration caused by low bonding performance of the copper and ceramic interface, the roughening of the ceramic particles in sintering and material conductivity reduction caused by the scattering of electrons at the copper and ceramic interface are solved, and the dispersion-strengthened alloy with higher hardness and higher conductivity is obtained. The invention also relates to a preparation method of the high-strength and high-conductivity dispersion-strengthened alloy.

The invention relates to negative-ion, far-infrared, antibacterial and anti-mite compound polyester fibers and a manufacturing method thereof. The compound polyester fibers are added with a negative-ion additive, a far-infrared additive and an antibacterial and anti-mite additive, wherein the negative-ion additive, the far-infrared additive and the antibacterial and anti-mite additive respectively account for 2%, 5% and 6% by mass in the compound polyester fibers; the negative-ion additive comprises an additive carrier and tourmaline negative-ion powder; the far-infrared additive comprises an additive carrier, Tai Chi stone powder, ZrO2 nano-powder, nano-silicon dioxide, nano-aluminum oxide, nano-manganese oxide and nano-calcium oxide; the antibacterial and anti-mite additive comprises an additive carrier, nano-Cu-ZnO compound particles, nano-titanium dioxide, nano-zinc oxide and nano-silicon dioxide; and the additive carrier is TiO2 hollow spheres.

The invention discloses a process and equipment for preparing a nanoparticle-reinforced metal matrix composite material. The process comprises the following steps of: mixing reinforcing nanoparticles with matrix metals and a grain growth inhibitor in a stirring ball mill together, and then loading the mixture into a steel pipe; casting the mixture together with the matrix metals in a water cooling crystallizer or casting and forming the mixture together with a molten metal in a casting mould; and performing quick solidification and crystallization after electromagnetic stirring and ultrasonic vibration to ensure that the two phase materials achieve complete metallurgical bonding, wherein because of the electromagnetic stirring and the ultrasonic vibration, the two phase materials are mixed more uniformly, and all properties of the composite material can be further improved. by using the process and the equipment, a production process is simple, the cost is low, the efficiency is high, the product performance is high, the process is easy to control, the external dimensions of products are not limited by the process, and large-sized nanoparticle-reinforced metal matrix composite materials can be manufactured.

The invention provides a preparation method for graphene with a three-dimensional porous structure. An even dispersion liquid is formed under the electrostatic interaction of a polystyrene template and graphene oxide, then the polystyrene template is removed through high-temperature calcination, and graphene with the three-dimensional porous structure is obtained after thermal reduction. According to the method, polystyrene spheres are taken as the template, and the pore size in graphene can be effectively controlled through controlling the particle size of the polystyrene spheres; and graphene is prepared through a calcination reduction method, so that problems of poisonous chemical reagent application and graphene agglomeration in a chemical reduction process can be avoided, and meanwhile the poriform structure of graphene after calcination is firmer.

The invention discloses a heat-conductive silicone grease composition being high in heat conductivity and low in viscosity and freeness degree, and a preparation method of the silicone grease composition. The heat-conductive silicone grease composition includes organo-polysiloxane, heat conductive filler and other additives. By selecting the heat conductive fillers in multiple dimensions (one-dimension, two-dimension and three-dimension) and multiple scales (micron, submicron and nanometer) and in special ranges, synergistic effect among the multi-dimension and multi-scale fillers is achieved,thus achieving compact stack of the fillers in a local network structure. The heat-conductive silicone grease not only is improved in heat-conductivity but also has good flowability, low viscosity and low freeness degree.

A method for preparing the nano SnO2 powder is provided. The soluble pink salt as the tin source is made into the pink salt solution with concentration of 0.1mol/L to 0.5mol/L. The diluted acid solution is added, and then 0g/L to 10g/L surfactant is added, the precipitant agent is added in drops and the pH value is adjusted to 2.5 to 10, reaction is carried out through magnetic stirring and under the constant temperature of 20 DEG C. to 80 DEG C. to produce the precursor. The nano SnO2 finished product is gained after filtering, washing by deionized water, ultrasonic washing by absolute ethyl alcohol, drying and roasting the gained product. The invention adopts the soluble pink salt as the raw material with low price and cost, which do not need to grind and sieve the precursor with high ratio of product output and simpler process. The nano SnO2 grain size is evener.

The invention discloses a polishing film and the preparation method, which adopts the ultrafine micro mist as the grinding material and prepares in flow-casting coating method, namely the powdered or granular resin is dissolved into the organic solvent and then added in functional additive to make the resin adhesive, then the abrasive of surface-modified ultrafine micro mist is added into the resin adhesive and the spread coating liquid can be obtained after fully mixing, finally the paint is painted on the surface of soft base in flow-casting coating method and the polishing film can be obtained after drying and curing. The preparation method of the polishing film has the advantages of small equipment investment, simple operation, high productivity and automation level, steady craft, even film performance and low manufacturing cost. The polishing film can adjust the craft parameters of the flow-casting craft conveniently according to the different quality requirement and standards of the products, and can achieve production in multi-specification and small lot production and overcomes the problems that the rapid transformation of the product specification is difficult due to the limit of the equipment structure in roller coating method.

The invention relates to a preparation method of a halogen-free flame-retardant polyurethane (PU) sealant. The preparation method comprises the following steps: dewatering and drying the following materials, namely a filler, a thixotropic agent, a halogen-free flame retardant, a flame-retardant synergist, a plasticizer, a light stabilizer and an antioxidant in vacuum; stirring a PU prepolymer and the materials for dispersion in a double planet mixer with a high-speed dispersion disk or a tri-roller grinder at the temperature of 30-50 DEG C for 2-5 hours under the condition that the vacuum degree is not less than 0.092Mpa; under normal pressure and protection of high-purity nitrogen, adding a catalyst A, a silane adhesion promoter and a water scavenger, and stirring for 0.1-1 hour for dispersion; and removing small molecules and stirring for 0.3-1 hour under the condition that the vacuum degree is not less than 0.092Mpa to finally obtain the halogen-free flame-retardant PU sealant. The halogen-free flame-retardant PU sealant effectively overcomes the disadvantages of the PU sealant such as big flame, fast burning speed, severe drippage and the like in the prior art on the premise of ensuring the original physical properties of the PU sealant, thus the PU sealant has the advantages of flame retardance, no drippage during the burning process, good adhesive property and the like.

The invention discloses a preparation method of a graphene/nano silver epoxy conductive adhesive, which comprises the following steps: (1) mixing graphite, promoter and organic solvent, then carrying out ultrasonic treatment at 20-50 DEG C for 3-6 hours, standing for 12 hours, centrifuging, and distilling; (2) dissolving epoxy resin and precursor in organic solvent, stirring at 20-50 DEG C for 5-30 minutes, adding a graphene solution to continue reacting for 10-40 minutes, distilling, and carrying out ultrasonic treatment for 5-20 minutes; and (3) adding silver sheets into the graphene-nano silver epoxy resin compound, and carrying out ultrasonic treatment to react at 20-60 DEG C for 30-120 minutes so as to obtain the graphene/nano silver epoxy conductive adhesive. The graphene/nano silver epoxy conductive adhesive disclosed by the invention ensures that the graphene-nano silver compound can be uniformly dispersed in the epoxy matrix, and avoids the problem that the prepared graphene conglobates when the epoxy resin is added, thereby being beneficial to realizing the low-temperature sintering of the nano silver and improving the conductivity and adhesive strength of the conductiveadhesive.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an inorganic and organic composite multihole diaphragm. The diaphragm comprises a multihole diaphragm base material and an active coating layer attached to at least one surface of the multihole diaphragm base material, wherein the active coating layer comprises inorganic particles, vinylidene fluoride and hexafluoropropylene copolymer, cellulose based polymer with the molecular weight of 100,000 to 1,000,000 and at least one of polyacrylic acid and polyacrylate. Compared with the prior art, the diaphragm keeps relatively high air permeability and lithium ion transmission capacity; the active coating layer and the multihole diaphragm base material are well bonded; and the overheating contraction performance and the puncture strength of a diaphragm base can be improved remarkably. Furthermore, the invention also discloses a preparation method for the diaphragm and a lithium ion battery with the diaphragm.

The invention provides a preparation method and application of a Si/SiOx/C composite material. By using the Si/SiOx/C composite material, the advantages that a Si-based negative electrode material is high in capacity, a SiOx-based negative electrode material is stable in circulation and a carbon material is good in electric conductivity are combined; the defects that a high-capacity negative electrode material is low in first coulombic efficiency and poor in cyclical stability are overcome; a Si/SiOx/C negative electrode material shows excellent electrochemical properties; meanwhile, the defects that a technique is complicated and the cost is high in the processing procedure of a nano-material are overcome; a technical route which is simple in production technique and available for commercialized large-scale production is researched and developed; the Si/SiOx/C composite material has a wide application prospect in the field of high-energy-density lithium ion batteries.

The invention discloses a nano-silver sol antibacterial agent and a preparation method thereof. The preparation method includes the steps: dissolving silver nitrate in water, adding ammonia water, adjusting pH (potential of hydrogen) to be 10+/-0.5 and adjusting the concentration of Ag+ to range from 0.006mol/l to 0.1mol/l to prepare silver ammonium solution; dissolving a reducing agent and a protective agent in the water to obtain reducing agent and protective agent solution; and slowly adding the reducing agent and protective agent solution into the silver ammonium solution according to the volume ratio of 1:1-5 of the reducing agent and protective agent solution to the silver ammonium solution when the silver ammonium solution is at 20-40 DEG C and 100-200rpm, performing ultrasonic operation for mixed solution for 5-20min under the condition of ice-bath after mixed reaction, and finally filtering the mixed solution to obtain colorless and transparent nano-silver sol antibacterial agent. In the silver ammonium solution, the quantity relative ratio of n (the reducing agent) to n (Ag+) is 1-5:1, the mass ratio of the n (the reducing agent to m (the protective agent) is 1-2:1, and output power is 150-200w. The nano-silver sol antibacterial agent can avoid agglomeration of nano-silver particles in long-term storage and use process.

The invention discloses a method for preparing lithium ion battery cathode material ZnFe2O4/C nano fibers. The method has the advantages that: 1, the preparation process flow is short, the diameter of the nano fibers can be controlled more effectively, nano fiber precursors with regular structure are obtained, and the lithium ion battery cathode material ZnFe2O4/C nano fibers with uniform structure are prepared by combining different change of two polymers in the calcining process; and 2, the prepared lithium ion battery cathode material ZnFe2O4/C nano fibers are apparently nano fibers, the diameter of the nano fibers is about 200 to 400 nanometers, ZnFe2O4 nano granules are distributed in the continuous phase of carbon in the internal structure, and meanwhile, because of the carbon, the volume change in the electrode circulating process is greatly relieved, the problem of granule agglomeration in the circulating process is solved and the electrochemical circulating stability is improved.

The invention discloses composite high-strength lead-free brazing filler metal for electronic packaging and a preparation method thereof. The composite high-strength lead-free brazing filler metal comprises graphene and lead-free brazing filler metal. The preparation method includes the steps of firstly, dispersing the graphene and lead-free brazing filler metal powder in ethyl alcohol under the ultrasonic action, and subjecting the ethyl alcohol solution with the graphene and the lead-free brazing filler metal powder to ball milling mixing; secondly, performing vacuum drying to obtain mixed powder of the graphene and the lead-free brazing filler metal powder; thirdly, placing the mixed powder of the graphene and the lead-free brazing filler metal powder into a mould to be squeezed to form a precast block, placing the precast block along with the mould in a vacuum furnace to sinter for 3 hours at the temperature of 180 DEG C, and demoulding to obtain the composite high-strength lead-free brazing filler metal. The composite high-strength lead-free brazing filler metal for electronic packaging and the preparation method thereof have the advantage that the problem that a lead-free brazing filler metal welding spot of an existing electronic product needs to bear high strength under working is solved.

The invention discloses an antimicrobial fabric supported with nano silver core-shell polymer microspheres and a preparation method thereof. According to the preparation method, amphipathic polyethylene glycol-maleic anhydride-octadecylamine (PEG-Ma-OC) is synthesized at first, and the polymerized styrene is emulsified and dispersed by utilizing the hydrophily and lipophilicity of PEG-Ma-OC, so as to obtain core-shell polymer microspheres; and silver is supported on the surface of the core-shell polymer microspheres, thereby achieving the dispersion uniformity of nano silver particles and well solving the agglomeration problem of the nano particles; by utilizing the high surface activity of the antimicrobial fabric on the surface of which the nano silver core-shell polymer microspheres are supported, the nano silver core-shell polymer microspheres are added in the fabric, thereby improving the biocompatibility of the antimicrobial fabric; polystyrene in the inner core is used, so thatthe strength of the fabric is improved, and the washing fastness and weather resistance of the antimicrobial fabric are enhanced; and the preparation process of the antimicrobial fabric is suitable for batch production and is easy to industrialize.

The invention discloses a making method of ultraviolet masking agent of sericite mica, which comprises the following steps: 1) preparing fined sericite mica; 2) activating the sericite mica powder; 3) adding water in the sericite mica to form the suspension with density at 2. 5-5%; adjusting the pH value to 2. 0-2. 5 through alcaine as system C; 4) allocating titanic chloride solution with density at 10-15%; adding zinc chloride in the titanic chloride solution; making the molar rate of Zn and Ti at 1: 2; obtaining the solution D; 5) dripping the solution D into the system D; controlling the pH value to 7. 0; 6) filtering the sediment; washing; drying at 95 deg. c; 7) grinding the drier; placing the drier in the electric furnace at 600 deg. c for 2-3h; 8) grinding the sintered material; beating to 10-15um; obtaining the product.