30results about How to "Performance varies" patented technology

The invention discloses a positive electrode material of a high-capacity lithium ion battery and a preparation method of the positive electrode material. The preparation method comprises the following steps: dissolving raw materials into de-ionized water to prepare a mixed solution A and a mixed solution B, which have the same volume and different concentrations; adding a sodium hydroxide solution and an ammonia water solution into a container C in a parallel flow manner to be subjected to co-precipitation, so as to prepare a co-precipitate Ni1-x-yCoxAly(OH)2+y precursor; after ageing, filtering, washing and drying the prepared co-precipitate precursor, uniformly mixing the co-precipitate precursor with a lithium source; pressing and molding mixed materials, putting the mixture into a pipe furnace for presintering, and sintering the mixture in an oxygen/oxygen-enriching air airflow to obtain a target product. The positive electrode material of the lithium ion battery, provided by the invention, has no impure phases and has high crystallization quality; the product has a uniformly-distributed grain diameter and a regular spherical shape, and has a very high specific discharge capacity and relatively excellent circulating stability; the positive electrode material can meet high-energy density and high-power charging and discharging requirements, a process is simple and a manufacturing cost is relatively low.

The invention relates to a preparation method of a Sn-base composite solder sheet based on a porous Ni/Cu alloy. The preparation method comprises the steps that first of all, a layer of Cu is preparedon the surface of porous Ni metal, and then high-temperature sintering is carried out, so that mutual diffusion between Ni and Cu is facilitated, and bonding of Ni and Cu is further tight; and then the porous Ni/Cu alloy is immersed into the molten Sn-base solder, and finally is rolled into a foil. In the porous Ni/Cu alloy subjected to high-temperature sintering treatment, the bonding strength of Ni and Cu is higher and the oxidation resistance is better through the mutual diffusion between Ni and Cu, and the relatively high strength, good plasticity, high corrosion resistance and high ductility are shown. Along with change of sintering parameters and electroplating parameters, concentration distribution gradients of Ni and Cu in the porous Ni/Cu alloy are different, reaction between theporous Ni/Cu alloy and the Sn-base solder is rapider in the brazing process, and the soldering reliability is high.

The invention belongs to the technical field of modified inorganic nanometer functional materials and discloses a novel nano-fluid and its preparation method and an application thereof. The preparation method comprises the following specific steps: dissolving inorganic nanoparticles in water, adjusting pH to alkaline by adding alkali, carrying out ultrasound, adding the inorganic nanoparticle solution into a silane coupling agent ethanol solution to react for 4-48h so as to obtain a nanoparticle solution containing epoxy functional groups; adding tertiary amine and hydrochloric acid to react for 1-48h, adding polyoxyethylene ether sulfonate to react for 1-48h, and purifying to obtain the novel nano-fluid. The novel nano-fluid is a fluid-like shape. Processability of nanoparticles is raised. The novel nano-fluid also can be used as a special solvent and a reaction medium. The preparation method is simple and easy to operate. Modified nanoparticles will not be agglomerated. Physicochemical properties of nanoparticle kernel are still retained, and nano-fluids with different properties can be obtained by adjusting the type of inorganic nanoparticles and polymerization degree of polyoxyethylene ether sulfonate.

The invention belongs to the metal material field, in particular to a hexagonal soft magnetic ferrite material that can be sintered at a low temperature directly. The invention is characterized in that the invention adopts Bi2O3 as one of the constituent, and replaces Ba2+ with Bi3+, and divalent metal Me2+ with Fe3+ to balance the overall electricity price. The crystal phase of the hexagonal soft magnetic ferrite material is Y-type hexagonal ferrite, and the molecular formula is Ba2-xBixMe2+xFe12-xO22, 0<x<0.5. Me is one or several types of Co, Zn, Cu, Mg, Mn, and Ni. The material has the advantages of low sintering temperature, wide sintering temperature, simple production method, application to industrialized production, stable performance, high reliability, and high indexes of performance. The magnetic conductivity of sintered samples is 2-30, cut-off frequency 500MHz-8GHz, temperature change rate not above 10-6/ DEG C, resistance rate above 108 ohm is multiplied by cm, and dielectric coefficient 10-20, which meet and even exceed requirements on magnetic medium by sensing components such as UHF inductance and piece magnetic bead, and various combined piece components.

The invention discloses a degradable photocurable resin and a preparation method thereof. The photocurable resin comprises 40 to 90 parts by weight of a degradable (methyl)acrylate prepolymer, 10 to 60 parts by weight of a small molecule (methyl)acrylate reactive diluent and 0.5 to 3 parts by weight of a photoinitiator. The degradable photocurable resin has the ability to degrade under the conditions of acid, alkali, neutral and biological enzyme, and can be applied to the fields of coating, biomedicine, 3D printing and the like.

The invention discloses a preparation method of a carbon-dioxide-base polyurea high polymer material, belonging to the technical field of preparation of high polymer materials. The method solves the problem that the carbon-dioxide-base polyurea in the prior art can not satisfy the requirements, and widens the application range of the carbon-dioxide-base polyurea. The preparation method comprises the following step: polymerizing amino-terminated polyurea oligomer with a chain extender, an epoxy resin, an alkyd resin, a phenol formaldehyde resin, a urea-formaldehyde resin or other active-terminated oligomers to obtain the carbon-dioxide-base polyurea high polymer material. The structural formula of the amino-terminated polyurea oligomer is disclosed as Formula I. The preparation method is green and environment-friendly, has the advantages of no pollution, simple technique, favorable atomic economical efficiency and wide application range, can prepare high polymer materials with various properties through further reaction between amino-terminated polyurea oligomers with different structures and different substrates, and is suitable for multiple purposes.

The invention discloses polyamide imide which is obtained by the exchange of terminal groups. The structural general formula of the polyamide imide is showed on the right, wherein, X in the formula is the remanent part of diisocyanate removed diisocyanato; the R' is the remanent structure of a compound containing active hydrogen removed hydrogen and the limiting viscosity number thereof is 0.1dL/g to 0.4dL/g. The invention also discloses a preparation method of the polyamide imide. As the polyamide imide provided by the invention which is obtained by the exchange of terminal groups not only has a great variety of terminal groups, thus being capable of obtaining polyamide imide which cannot be obtained through direct terminating method, but also has a higher molecular weight, stable storage and is characterized by simple preparation and low cost, and the polyamide imide disclosed by the invention can greatly widen the application range of the polyamide imide.

The invention discloses a ferrocenyl benzoxazine-containing monomer or precursor and its preparation method as well as a ferrocenyl benzoxazine-containing resin prepared by thermal curing of the monomer or precursor. The preparation method provided by the invention comprises the following steps of: mixing and dissolving 1-400 wt% of reactants and organic solvents in a reactor while the temperature is controlled within 40-130 DEG C and the reaction lasts for 0.5-24 hours; washing a purification product by the use of an alkaline solution at the concentration of 0.01mol/L-5mol/L, washing the product to neutral by the use of pure water, removing the organic solvents, and drying to prepare the ferrocenyl benzoxazine-containing monomer or precursor. The ferrocenyl benzoxazine-containing resin is obtained by the heating, ring-opening and curing molding of the monomer or precursor. The monomer or precursor has low curing temperature, has a self-catalysis curing function, is widely applied, and can undergo crossing and curing under the heating condition without a catalyst and with no release of micromolecules. The cured ferrocenyl benzoxazine-containing resin has high temperature resistance and electromagnetic properties, and has an application prospect in the aspects of high temperature ceramics, electrochemical induction, high dielectric materials, magnetic ceramic body and the like.

The invention relates to a poly(alkene carbonate) diol-polybutylene succinate copolymer and a preparation method thereof. The copolymer is formed by randomly copolyesterifying 6 to 120 poly(alkene carbonate) diol molecules and 5 to 180 polybutylene succinate molecules. The preparation method adopts a direct melt polycondensation method, and comprises the steps of: esterifying 1, 4-butanediol, butane diacid and stannous chloride in a reaction kettle first, and then adding titanium tetraisopropylate into the reaction kettle to react for 1 to 8 hours to obtain a polybutylene succinate oligomer; and performing a melt copolycondensation reaction on a reactant, the polybutylene succinate oligomer and a catalyst to obtain a poly(alkene carbonate) diol-polybutylene succinate random copolymer, wherein the reactant is poly(ethylene carbonate) diol, poly(propylene carbonate) diol or poly(butylene carbonate) diol. The method simplifies process operation, and can adjust the block length of a final product and the molecular weight of the copolymer by controlling the molecular weight and the adding amount of the poly(alkene carbonate) diol to obtain copolyesters with different performances.

The invention discloses a long-acting organic mixed fertilizer. The long-acting organic mixed fertilizer comprises the following ingredients in percentages by weight: 31-40% of pig manure, 13-19% of straw powder, 9-17% of earthworm manure, 11-21% of a cake fertilizer, 9-14% of kieselguhr, 4-6% of a seaweed extract and 1-4% of a nitrogen-phosphorus-potassium fertilizer. The various ingredients are proportioned in different percentages by weight, so that the obtained products are different in performances, thus obtaining different use effects; the proportions of the various raw materials are adjusted according to the differences of the needed nutrients in soil, thus ensuring that crops obtain enough nutrients during growth processes and ensuring the healthy growth of the crops.

The invention discloses a spiral-structure string and a manufacturing method thereof. The spiral-structure string is composed of a core string, collodion silks and an outer wrapping string. The core string and the collodion silks are intertwined and wrapped by the outer wrapping string to form the spiral-structure string. In braiding of the spiral-structure string, thickness and colors of peripheral yarns can be changed to achieve bright and colorful appearance. In addition, thickness and hardness of the core string and amount and positions of the collodion silks can be changed to form spiral-structure strings with different performances. The spiral-structure string is widely applicable to decorations of shoes, hats, clothes, households, bags and the like, and accordingly high attractiveness is realized.

The invention discloses a semiconductor vortex light laser based on topological photons, which belongs to the field of optoelectronic devices. The laser sequentially comprises a p electrode layer, a p-type ohmic contact layer, a two-dimensional photon topological structure layer, a refractive index guide layer, an active layer, an n-type ohmic contact layer and an n electrode layer from top to bottom. The two-dimensional photon topological structure is composed of a photonic crystal array with a photon spin-orbit coupling effect, each photonic crystal is formed by alternately stacking voltage layers and magnetic pressure layers, and vortex laser beams are generated through interaction of the two-dimensional photon topological structure on a light field in the active region. The spinning characteristic of laser output is changed through a two-dimensional topological photonics structure, and high-integration vortex laser output is effectively achieved.

The invention discloses a block copolymer obtained by ring-opening copolymerization of 6,7-dihydro-5H-oxepin-2-ketone (DHO) series unsaturated lactone and lactide, and a preparation method thereof. The invention induces a DHO series unsaturated monomer into a main chain of polylactic acid to obtain an unsaturated polylactic acid block copolymer with a main chain containing a carbon-carbon double bond, and can induce a branch chain with appropriate length on the main chain of the polylactic acid by utilizing the carbon-carbon double bond with reactivity, which has great significance for improving the melt strength and processability of polylactic acid material. In addition, the preparation method of the unsaturated polylactic acid block copolymer has simple operation process, low synthesistemperature, and can adjust the chain length of each component in the unsaturated polylactic acid block copolymer and the molecular weight of the copolymer by controlling the adding amount of each reactant so as to obtain the unsaturated polylactic acid block copolymers with different properties.

The invention discloses a novel construction steel bar sleeve. The novel construction steel bar sleeve comprises a sleeve body, a steel bar mechanical connecting hole, a slurry outlet and a grouting opening, the whole sleeve body is of a cylindrical structure, and the outer surface of the sleeve body is of a concave-convex structure; the steel bar mechanical connecting hole is formed in the left end of the sleeve body, and the steel bar mechanical connecting hole is of a through hole structure; the slurry outlet is formed in the left side of the upper end of the sleeve body; and the grouting opening is formed in the right side of the upper end of the sleeve body, the steel bar mechanical connecting hole is a threaded hole which is connected with the sleeve body after a steel bar is threaded, and the steel bar mechanical connecting hole is formed in the left end of the sleeve body in an embedded mode. The novel construction steel bar sleeve is manufactured by machining high-quality carbon structural steel, the performance of raw materials is improved through hot forging and pressing, the plane precision is guaranteed through numerical control cutting, the situation that the material properties are different due to uneven heat treatment is prevented through cooling liquid drilling, and finally rust-proof treatment is carried out, so that the novel construction steel bar sleeve is more stable, more reliable, better in performance and higher in machining size precision.