7results about How to "No reunion" patented technology

This invention relates to an insulating oil and an oil-paper insulation system containing superhydrophobic nanoparticles, as well as their preparation method and application, belonging to the field of electrical equipment insulation technology. This invention provides an insulating oil containing superhydrophobic nanoparticles, wherein the superhydrophobic nanoparticles are silane-modified nanoparticles, and the nanoparticles include at least one of SiO2, TiO2, and h-BN; the insulating oil includes at least one of mineral insulating oil, synthetic insulating oil, and natural ester insulating oil. This invention achieves the superhydrophobicity of the nanoparticles and good compatibility with the oil phase through silane modification. Adding silane-modified nanoparticles to the insulating oil effectively reduces the water content of the insulating oil and optimizes the interfacial performance of the oil-paper. Combined with the low-temperature, high-efficiency, and uniform rapid impregnation process of this invention, the overall electrical performance and service life of the oil-paper insulation system are significantly improved.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

The application provides a high-thermal-conductivity diamond / copper composite material and an SPS sintering process thereof, raw material pretreatment: selecting three kinds of monocrystalline diamond particles with different particle sizes, mixing the titanium-plated diamond obtained after vacuum titanium plating treatment; solid dry powder mixing: uniformly mixing a solid additive and graphene modified copper powder to prepare a copper-based composite dry powder; nitrogen intermittent airflow suspension dispersion: adding the titanium-plated diamond into a sealed covering tank to make the titanium-plated diamond suspended and dispersed in the sealed covering tank; atomization covering makes the copper-based composite dry powder uniformly covered on the surface of the titanium-plated diamond to obtain composite particles; vacuum low-temperature degreasing to obtain the composite particles after degreasing, and SPS sintering demolding to obtain the high-thermal-conductivity diamond / copper composite material. The coating is uniform and dense, has no exposure and no agglomeration, and significantly reduces porosity and interface thermal resistance; the proportioning is accurate, the degreasing is thorough, and there is no residue; the generation of brittle phases is inhibited, and the interface combination is excellent; the thermal conductivity is stable and greater than 700 W / (m*K), and the density is greater than or equal to 99%.

The application belongs to the field of high polymer materials, and particularly discloses a modified basic magnesium carbonate and a PA12 composite material and a preparation method thereof.The preparation method of the modified basic magnesium carbonate comprises the following steps: adding sodium carbonate and magnesium chloride into a sodium hydroxide solution to perform a water bath reaction to obtain the basic magnesium carbonate; adding the basic magnesium carbonate and acrylic acid into deionized water to perform a water bath reaction to obtain acrylic acid modified basic magnesium carbonate; and adding the acrylic acid modified basic magnesium carbonate, glycidyl methacrylate and an initiator into an organic solvent aqueous solution to perform a water bath reaction to obtain the modified basic magnesium carbonate.The modified basic magnesium carbonate prepared by the application can decompose and absorb heat at high temperature, release water vapor and carbon dioxide and other non-combustible gases, dilute the oxygen concentration on the surface of the combustion object, and reduce the temperature of the combustion area, so as to play a role in flame retardation.In addition, the magnesium oxide produced by decomposition covers the surface of the material to form a protective layer, and further prevents the combustion.

This application discloses a steel pipe jacking core filling material and its preparation method. The raw materials of the steel pipe jacking core filling material in this application include gel material, coarse aggregate, fine aggregate, wetting and dispersing agent, and water. The weight of the wetting and dispersing agent is 1.0-1.5% of the total mass of the gel material. The wetting and dispersing agent is compounded from maleic anhydride copolymer and organic bisacrylic surfactant. The cementing material includes cement, mineral powder, and fly ash. The molecular structure of the maleic anhydride copolymer is comb-shaped. The molecular weight of the main chain of the maleic anhydride copolymer is 5000-100000 g / mol, and the molecular weight of the side chain of the maleic anhydride copolymer is 100-500 g / mol. The molecular structure of the organic bisacrylic surfactant is comb-shaped. The molecular weight of the main chain of the organic bisacrylic surfactant is 5000-100000 g / mol, and the molecular weight of the side chain of the organic bisacrylic surfactant is 2000-5000 g / mol. The filler material in this application has better fluidity and density properties, and better volume stability, which can meet the dual requirements of mechanical properties and durability of lifting filler materials.

The application discloses praseodymium-neodymium oxide and a preparation method thereof. The preparation method comprises the following steps: 1) adding a praseodymium-neodymium chloride solution and ammonia water into an ammonium acetate solution in a parallel flow mode, performing solid-liquid separation after the reaction is completed, and obtaining a praseodymium-neodymium oxide precursor; 2) performing calcination on the praseodymium-neodymium oxide precursor, and obtaining praseodymium-neodymium oxide. The praseodymium-neodymium oxide has a porous sheet structure. The praseodymium-neodymium oxide with the porous sheet structure can be obtained by using the preparation method.

This invention discloses an Al-Bi-Sn immiscible alloy and its rotational deposition solid-state additive manufacturing method, belonging to the fields of metal composite materials and solid-state additive manufacturing technology. In this invention, the Al-Bi-Sn immiscible alloy is, by atomic percentage (at.%), Al 100‑x‑ y Bi x Sn y The alloy is prepared by rotational deposition solid-phase additive manufacturing method, where x = 8~15, y = 7~20, and x+y = 15~35. By controlling the component ratio and microstructure, the present invention achieves uniform composite of BiSn solid solution matrix and Al phase particles, with no particle agglomeration, high density, and excellent hardness and self-lubricating wear resistance, which can directly meet the application requirements of lightweight wear-resistant components such as automotive bearings and dry friction bearings.