33results about How to "Strong chemical bonding" patented technology

The invention relates to a method for preparing a battery diaphragm, comprising the following steps: providing a polyolefin porous membrane; attaching an oxidizing agent to the surface of the polyolefin porous membrane; providing a liquid phase medium having an organosilicon compound, the organosilicon compound comprising A methacryloxy group and at least two alkoxy groups, the alkoxy group and the methacryloxy group are connected to silicon atoms respectively; heating in a medium to polymerize the organosiloxane compound, and graft it with the polyolefin porous membrane; provide an acidic environment or an alkaline environment, and place the grafted polyolefin porous membrane in an acidic environment or an alkaline environment, The siloxane group is condensed to form a cross-linked network structure, and the siloxane cross-linked network structure is grafted on the polyolefin porous membrane. The invention also relates to a battery separator.

The invention discloses a toughening type benzoxazine composite and a preparation method thereof. The toughening type benzoxazine composite is prepared by solidifying 75-96 parts of benzoxazine monomers, 3-20 parts of nylon 12 microspheres and 0.1-5 parts of benzoxazine monomer modified graphene oxide at the temperature of 160-200 DEG C. Benzoxazine monomer modified graphene oxide can effectively assist nylon 12 microspheres in uniformly dispersing in a benzoxazine resin matrix and thereby playing a role in synergistic toughening. The toughening type benzoxazine composite has high breaking tenacity, high Young modulus and high tensile strength. The toughening type benzoxazine composite can be widely applied to occasions with high requirements for the material toughness.

The invention provides a three-dimensional bionic bone repair material and a preparation method thereof. The three-dimensional bionic bone repair material forms a porous structure comprising a plurality of parallel oriented fiber layers through a two-way freezing method, and the oriented fiber layers are formed by interpenetrating bioactive glass fibers. Composed of a mesh plane, the interlacing points of bioactive glass fibers are interconnected by dopamine bonds. By simulating the ordered structure of bone tissue, it is beneficial to the repair of bone tissue. At the same time, the cross-linking of fibers realizes effective bonding and interconnection through dopamine cross-linking, and the preparation process is simple. The present invention can also prepare the polylactic acid composite three-dimensional bionic bone repair material by coating the polylactic acid on the bioactive glass fiber, increase the toughness of the bioactive glass fiber, and further improve the mechanical properties of the three-dimensional bionic bone repair material.

The invention discloses a preparation method and an application of a nickel phosphide hollow structure composite material. The method comprises the following steps: 1, preparing an Ni-hollow structure material through a hydrothermal reaction; 2, mixing the dried Ni-hollow structure material with a phosphorus source, placing the obtained mixture in a tubular furnace, and carrying out calcining phosphatization to obtain a nickel phosphide hollow structure material; and 3, mixing the nickel phosphide hollow structure material obtained in step 2 with sublimed sulfur, uniformly grinding the obtained mixture, heating the ground mixture until the mixture is molten, and cooling the molten mixture to room temperature in order to obtain the nickel phosphide hollow structure composite material. The composite material prepared in the invention has a large-size hollow structure, so the composite material has an obvious confinement effect on sulfur, and the shuttle effect of lithium polysulfide is obviously inhibited; and additionally, the highly-conductive composite material improves the electrochemical reaction activity of the sulfur, so the material has long cycle life and high energy density.

The invention discloses a silver conductor paste with strong adhesion for a 5G ceramic dielectric filter. The silver conductor paste is composed of 55% to 70% of spherical silver powder, 6% to 20% of flake silver powder, and glass powder 0.5% to 3%, heat-treated active dolomite powder and cryolite powder mixture 0.2% to 2%, organic carrier 8% to 15%, slurry modifier 1% to 5%, organic diluent 5% to 11%. In the present invention, after the dolomite powder and cryolite powder raw materials are heat-treated, a mixture of active dolomite powder and cryolite powder is formed and added to the conductive silver paste to finally obtain a high-adhesion silver conductor paste, and the pulling part does not peel, and is tested at the same time Good solderability and excellent electrical conductivity. After the silver conductor paste of the present invention is applied to a series of 5G ceramic dielectric filter tiles, the leveling property is good, the metallized film layer is smooth, and the adhesion is improved while taking into account the conductivity of the paste, which can effectively reduce the Insertion loss, so that the filter has a higher quality factor.

The invention discloses a method for preparing boron and phosphorus-doped graphitized carbonitride cathode materials activated by KOH, which belongs to the technical field of lithium-sulfur batteries. The purpose of the present invention is to solve the problem that the sulfur carrier in the lithium-sulfur battery cannot achieve high sulfur load and has low conductivity. The method is: weigh the reaction raw materials according to a certain mass ratio, mix the three, add deionized Stir evenly with water, heat to precipitate a white solid, and then calcine after blast drying to obtain a graphitized carbonitride material doped with boron and phosphorus; dry it, weigh the graphitized carbonitride material doped with boron and phosphorus and hydrogen oxide Potassium solid, dissolve the latter in ultrapure water, add graphitized carbonitride material, stir and heat on a magnetic stirrer, blow dry and then calcinate. The material of the invention has a large specific surface area and a highly interconnected graphite-like layered stacking structure, has good electrical conductivity and a porous structure, and can improve ion transport and relieve volume expansion.

The invention provides a negative pole active material. The negative pole active material comprises a core body and a plurality of modified bodies attached to the external surface of the core body, wherein the core body is made from graphite and the modified bodies are made from stannate. The invention further provides a preparation method of the negative pole active material, which comprises the following steps of: mixing the graphite with aqueous liquid of soluble stannate, and adding an organic polymer and a complexing agent, thereby obtaining a mixed system; then dropwise adding aqueous liquid of a soluble metal salt into the mixed system, producing water-insoluble stannate as the soluble metal salt reacts with the soluble stannate, obtaining a precursor suspension after completing precipitation, and obtaining a precursor after filtering and drying; and carrying out heat treatment on the precursor, thereby obtaining the negative pole active material. The invention further relates to a lithium-ion battery containing the negative pole active material. The negative pole active material prepared by adopting the preparation method provided by the invention has the advantages of high capacity, stable structure and high charge-discharge cyclical stability.

The invention relates to a carbon fiber reinforced polyester composite material and a preparation method thereof. The preparation method comprises the following steps: performing heat preservation oncarbon fiber coated with a thermosetting resin sizing agent at 250-350 DEG C for 0.5-15 minutes, then adding low-temperature heat-treated carbon fiber from a fiber feeding hole of a twin-screw extruder, adding a mixture of thermoplastic polyester, an antioxidant and a lubricant from a twin-screw extruder hopper, and extruding to obtain the carbon fiber reinforced polyester composite material withtensile strength of 160-220 MPa and bending strength of 240-290 MPa, wherein the mass ratio of the carbon fiber coated with the thermosetting resin sizing agent to thermoplastic polyester to the antioxidant to the lubricant is (20-40):(60-80):(0.1-0.3):(0.1-0.5). The preparation method has low heat treatment temperature and low energy consumption, the surface of the carbon fiber after treatment isrich in carboxyl groups which can react with thermoplastic polyester, which is beneficial to chemical bonding with thermoplastic polyester, and thus the carbon fiber reinforced polyester composite material has a great application prospect.

The invention relates to silicate material field used in repair and substitution for bone and tooth. Wherein, mixing materials with weight share in alumina ball mill tank; putting into alumina crucible, hot smelting in silicomolybdic bar furnace; pouring fused glass into water for quenching, drying and smashing; remelting the glass powder to cast in graphite mould at 500-700Deg for one hour; cooling to room temperature and obtaining even glass parent body; heating to 800-110Deg for 4-24h to separate controlled glass ceramic contained fluorine bronze mica and fluorapatite. The product has bending strength and elastic modulus fit to mechanical property of bone and teeth of human body, and can generate strong chemical bond with human bone group. This invention is simple and convenient to operate.

The invention discloses a preparation method of a lithium-sulfur battery cathode material based on a phosphorus-doped graphene supported nickel phosphide material. The method comprises the following steps: (1) adding a surface active agent into graphene oxide to obtain graphene oxide dispersion liquid; (2) adding a nickel source and alkali liquor into distilled water to obtain a saline solution; (3) adding the saline solution into the graphene oxide dispersion liquid, carrying out a hydrothermal reaction, then washing, and carrying out freeze drying to obtain a graphene composite material loaded with a nickel precursor; (4) enabling the graphene composite material loaded with the nickel precursor to be subjected to a phosphating reaction so as to obtain the phosphorus-doped graphene supported nickel phosphide material; (5) compounding the phosphorus-doped graphene supported nickel phosphide material with sublimed sulfur to obtain the lithium-sulfur battery cathode material based on thephosphorus-doped graphene supported nickel phosphide material. The phosphorus-doped graphene supported nickel phosphide material prepared by the method has a three-dimensional space structure, thus having an obvious domain limiting effect on sulfur and remarkably inhibiting the shuttle effect of lithium polysulfide.

The invention belongs to the field of catalytic materials, in particular to a millimeter sphere catalyst for one-step synthesis of chiral alcohols and chiral esters from acetophenone. Metals and enzymes are assembled inside the catalyst, the particle size is 0.9-3.0mm, and the mechanical strength is as high as 3.0-15.0N. The silicon oxide nanoparticles were added into deionized water and stirred evenly to obtain a two-component silicon oxide mixed solution; the two-component silicon oxide mixed solution was continuously dropped on the tiled superhydrophobic silicon oxide powder, and rolled slowly to form a Droplet millimeter spheres with a hydrophobic shell of silicon oxide; the droplet millimeter spheres were collected and dried slowly; finally rinsed with acetone and dried in vacuum to obtain millimeter spheres encapsulating metal-enzyme dual catalysts, which can be directly loaded into immobilized One-step synthesis of chiral alcohols and chiral esters from acetophenone in a bed reactor.