12results about How to "Less structural defects" patented technology

The application discloses a device and method for preparing graphene by electrophoretic hydrodynamic cavitation liquid phase stripping, which comprises a graphite flake raw material slurry tank, a diaphragm pump, a high-pressure pump, an electrophoretic high-pressure liquid phase stripping assembly, a first cyclone separator, a second cyclone separator, a graphene slurry tank and a wastewater tank; the diaphragm pump and the high-pressure pump are installed on a pipeline between the graphite flake raw material slurry tank and an input end of the electrophoretic high-pressure liquid phase stripping assembly; the first cyclone separator and the second cyclone separator are installed on a pipeline connected to an output end of the electrophoretic high-pressure liquid phase stripping assembly; a discharge port of the first cyclone separator is communicated with a feed port of the second cyclone separator; and a discharge port of the second cyclone separator is communicated with the graphene slurry tank. Compared with a traditional chemical method, the device has the advantages of green environmental protection, less defects of graphene structure and better preservation of characteristics of graphene; and compared with a traditional physical method, the device has the advantages of high production efficiency and better dispersibility.

The invention relates to the technical field of chemical synthesis, and discloses a PMMA impact modifier and a preparation method and application thereof.The PMMA impact modifier comprises a core layer, a transition layer and a functional shell layer, the core layer is sequentially coated with the transition layer and the functional shell layer, the core layer is a soft monomer crosslinking layer, the transition layer is a soft monomer and hard monomer crosslinking layer, the functional shell layer is a hard monomer crosslinking layer, the functional shell layer contains a photochromic component. Through the multi-layer structural design of the core layer, the transition layer and the functional shell layer, the shock resistance, the optical performance and the functional performance are synergistically improved; the core layer endows the material with good toughness and energy absorption capability, the transition layer effectively buffers performance difference between layers and keeps transparency, and the functional shell layer introduces a photochromic component while ensuring structural rigidity and durability, so that the material has a peep-proof function under the change of illumination conditions; the method is suitable for application scenes with high requirements on safety and functionality, such as PMMA products, automobile glass and the like.

This invention relates to the field of carbon composite materials, specifically providing a MOF-pitch-based porous carbon composite material, its preparation method, and its applications. The preparation method includes the following steps: doping a transition metal oxide and a nitrogen source into a MOF material to obtain a MOF precursor; mixing the MOF precursor with an amine crosslinking agent and oxidized pitch, followed by pre-carbonization and activation to obtain pitch-based porous carbon; and fluorinating the pitch-based porous carbon to obtain the MOF-pitch-based porous carbon composite material. The MOF-pitch-based porous carbon composite material prepared by this method possesses high pore volume, high crush strength, and high initial efficiency, exhibiting excellent electrochemical and electrical properties when used as a negative electrode material for lithium-ion batteries.

The present application relates to the technical field of building engineering, and particularly relates to a wall type damper cantilever wall construction device and a construction method. The construction device comprises a formwork group and a frame module group. The middle part of the formwork group is provided with a rectangular frame opening, which is divided into upper and lower cantilever wall pouring areas. The reinforcing mesh is bundled in the areas, and the embedded parts are fixed. The frame module group comprises slidingly sleeved U-shaped upper and lower mold bases. Diagonal vertical screw rods and screw pipes constitute a first adjusting assembly to control the spacing. The left and right side plates are provided with grooves to install movable formworks. Horizontal screw rods and screw pipes constitute a second adjusting assembly to control the displacement of the movable formworks. The construction method is as follows: the reserved inner formwork of the formwork group is installed, the reinforcing mesh is bundled, the embedded parts are installed, and then the inner formwork is sealed. The frame module group is placed, the movable formworks are positioned to ensure that the channel opening diameters are consistent, the movable formworks are withdrawn, and the upper and lower mold bases are adjusted to be attached to the embedded parts. The concrete is poured synchronously, the formworks are removed after curing, the plain concrete of the channel opening is cut, and finally the damper is installed to realize the integrated molding of the upper and lower cantilever walls.

The application relates to a method for preparing fluorinated graphene, and belongs to the graphene material field. The preparation method comprises the following steps: mixing and dispersing waste lithium battery recovery graphite powder, an intercalation agent and a dispersing agent in water to form a slurry, keeping the slurry at 40-60 DEG C for 4-8 hours, then spraying the slurry through a high-pressure device to form high-speed jets, and realizing graphite layer peeling through the cross impact of multiple jet beams, then adding a fluorination agent, keeping the slurry at 150-200 DEG C for 6-12 hours, centrifugally separating upper clear liquid, filtering and washing, vacuum drying, and obtaining fluorinated graphene. The application realizes graphite layer peeling through liquid cross impact, has high production efficiency, the obtained graphene sheet layer is regular and neat, has few structural defects, and the performance of the graphene is improved; the peeling strength can be adjusted by adjusting the jet speed, different layer number graphene products can be obtained, and the production is continuous, and the efficiency is relatively high; the raw material is waste lithium battery recovery graphite, the cost is low, the obtained graphene contains oxygen-containing functional groups, and has good water solubility.

The invention discloses application of an ionic liquid functionalized copper compound nano-catalyst in degradation of antibiotics. A preparation method of the ionic liquid functionalized copper compound nano-catalyst comprises the following steps: (1) carrying out alkylation reaction on raw materials including 2-mercapto-1-methylimidazole and long-chain halogenated alkane; (2) carrying out ion exchange reaction on a product obtained in the step (1) and bis (trifluoromethanesulfonyl) lithium imide to obtain sulfydryl functionalized ionic liquid; and (3) fully mixing a copper acetate aqueous solution with the sulfydryl functionalized ionic liquid prepared in the step (2), separating to obtain an oil phase containing copper ions, and carrying out precipitation reaction on the oil phase and a strong alkali aqueous solution to obtain the ionic liquid functionalized copper compound nano-catalyst. The ionic liquid functionalized copper compound nano-catalyst disclosed by the invention is novel in structure, the dosage of the photocatalyst is lower when antibiotics are degraded, the degradation efficiency of 90% or above can be realized only in 5 minutes, and excellent catalytic activity and cycling stability are shown.

The invention belongs to the technical field of supercapacitor electrode materials, and relates to an all-solid-state supercapacitor based on a CuCo2O4-PDMT composite electrode and a preparation method thereof.The preparation method comprises the steps that copper nitrate and cobalt nitrate serve as metal sources, and a CuCo2O4 bottom layer is prepared through constant-potential electro-deposition-muffle furnace annealing; 2, 5-dimethylthiophene (DMT) is used as a monomer, a PDMT top layer is prepared through cyclic voltammetry electropolymerization, and a CuCo2O4-PDMT composite electrode is formed; polyethylene glycol (PEG) is used as a gel matrix, lithium perchlorate (LiClO4) is used as an ion source, nano TiO2 is used as a reinforcing agent, and the composite gel electrolyte is prepared through'microwave dissolution-ultraviolet curing '. The composite electrode and the gel electrolyte are assembled into the all-solid-state symmetrical supercapacitor, so that the defects of high electrode electron transmission impedance, low gel electrolyte ion conductivity and insufficient cycling stability of the existing all-solid-state supercapacitor are overcome, and the collaborative construction of the composite electrode conductive network and the gel electrolyte ion channel is realized; and the performance limitation of traditional single component optimization is broken through.

The invention discloses a synthetic quartz crucible, preparation equipment thereof and a method for inhibiting brown rings on the inner surface of the synthetic quartz crucible, and belongs to the technical field of quartz crucibles. The equipment comprises a melting chamber, an air inlet system, an electrode, a helium inlet system, an exhaust system, a mold vacuum system and a mold, the mold, the mold vacuum system and the electrode are all positioned in the melting chamber; the melting chamber is communicated with the air inlet system, the helium inlet system and the exhaust system; the mold vacuum system is arranged on the outer side of the mold to vacuumize the mold; the electrode is arranged above the mold. The gas environment in the melting chamber is controlled through the air inlet system, the helium inlet system and the exhaust system, the vacuum degree in the mold is adjusted through the mold vacuum system, pollution and impurity enrichment on the inner surface of the crucible can be effectively reduced, microbubbles on the inner surface of the crucible can be reduced, and then structural defects caused by bubble breakage are reduced. By adopting the equipment to prepare the synthetic quartz crucible, the number of brown rings on the inner surface of the crucible can be effectively inhibited.

The invention relates to the technical field of membrane separation materials and discloses an SD membrane based on synergistic alcohol phase system interfacial polymerization and a preparation method of the SD membrane. The SD membrane has high flux, controllable desalination rate and excellent operation stability. The preparation method comprises the following steps: (1) adding a polymer into an organic solvent to obtain a mixed solution; (2) continuing to add a pore-foaming agent to obtain a precursor solution; (3) carrying out vacuum defoaming treatment on the precursor solution, and blade-coating the precursor solution on a carrier to obtain a base membrane; (4) sequentially infiltrating the base membrane into the synergetic alcohol phase system solution and the oil phase solution to perform polyamide treatment to obtain an SD membrane; the synergetic alcohol phase system solution comprises an interfacial polymerization amine monomer, a diffusion regulator, a network building agent and a functional copolymerization monomer; the diffusion regulator comprises monohydric alcohol of which the number of carbon atoms is less than or equal to 3; the network building agent comprises polyhydric alcohol with the number of carbon atoms smaller than or equal to 3 or a polymer of the polyhydric alcohol; the functional comonomer comprises an alcohol amine compound with the number of carbon atoms less than or equal to 4; the oil phase solution includes an interfacial polymerization acyl chloride monomer.

The application discloses a functional ceramic reinforced multiphase refractory brick and a preparation method thereof, and relates to the technical field of refractory bricks. The functional ceramic reinforced multiphase refractory brick is prepared from the following components in parts by mass: 25-35 parts of corundum, 15-20 parts of silicon carbide, 12-18 parts of mullite, 1-2 parts of lanthanum oxide, 8-12 parts of silicon nitride, 5-10 parts of zirconium oxide, 2-4 parts of borax, 1-3 parts of titanium dioxide, 4-6 parts of calcium aluminate cement, 0.5-1.5 parts of a metal chelating agent, 0.2-0.5 parts of sodium hexametaphosphate and 3-5 parts of deionized water. Compared with the general metal chelating agent in the prior art, the specific structure metal chelating agent used in the application can form stable chelates with metal ions in the raw materials, strengthens the interface bonding between inorganic particles, inhibits the migration and agglomeration of metal ions at high temperatures, reduces structural defects and improves the overall stability of the brick body.

The application discloses a kind of based on laminated continuous fiber periodic structure path planning method and device, the method includes: according to the configuration of the first preset rule to determine to select periodicity single cell structure;Based on single cell structure in design domain division unit, and based on all units in design domain to single cell structure is arranged and combined processing;Based on the connection relationship between the nodes of the configuration of all single cell structures in design domain is determined by preset minimum distance, and the adjacent matrix indicating node connection relationship is established;Based on adjacent matrix, initial node and traversal direction, according to the second preset rule is carried out path planning to obtain based on laminated continuous fiber periodic single cell structure path.The application can realize the path planning of periodic structure of complex single cell type composition and the periodic single cell structure of different single cell type combination, and combined with composite laminated idea to reduce the structural defects caused by fiber dislocation when 3D printing periodic structure.

This invention relates to a large effective area ultra-low attenuation multi-core optical fiber and its applications. The large effective area ultra-low attenuation multi-core optical fiber includes at least four core layers and a common cladding surrounding and covering the core layers. The core layers are symmetrically and uniformly distributed across the fiber cross-section. Each core layer is surrounded by an inner cladding and a recessed inner cladding layer, arranged sequentially from the inside to the outside. The common cladding layer includes a first outer cladding layer and a second outer cladding layer. The relative refractive index difference between the first and second outer cladding layers increases from the inside to the outside. This invention, through a multi-layer cladding structure of "inner cladding-recessed inner cladding-first outer cladding-second outer cladding layer," combined with the increasing relative refractive index difference between the first and second outer cladding layers from the inside to the outside, achieves a synergistic improvement in ultra-low attenuation, large effective area, ultra-low inter-core crosstalk, excellent bending resistance, and good system compatibility, providing an ideal transmission medium for long-distance, high-capacity space-division multiplexing optical communication systems.