26results about How to "Reduce interface defects" patented technology

The present application relates to the technical field of resin, in particular to a conductive polypropylene composite material and a preparation method thereof.In view of the problems of poor processing fluidity, easy shear damage of conductive network and deterioration of mechanical properties caused by high filling of conductive filler in the prior art, the present application realizes the low volume resistivity, high melt flow rate and excellent mechanical toughness by the solid phase pre-coating technology, and effectively balances the conductivity, processability and strength.

This invention discloses a high-performance vitrified microsphere composite polystyrene particle insulation board and its preparation method, comprising the following steps: premixing hydrophobic vitrified microspheres and expandable polystyrene particles coated with expanded graphite at a mass ratio of (2.5~4):1 to obtain composite lightweight aggregate. The insulation board prepared by this invention, with a dry density of only 184-193 kg / m³, exhibits a compressive strength as high as 0.275-0.302 MPa, significantly superior to traditional inorganic insulation boards (0.15-0.25 MPa) and organic insulation boards (0.10-0.15 MPa); its thermal conductivity is as low as 0.034-0.041 W / (m·K), and its insulation efficiency is more than 40% higher than that of traditional inorganic materials, while also possessing Class A fire safety performance; furthermore, the process is simple and controllable, with an industrial solid waste utilization rate of up to 70%, demonstrating significant economic benefits and environmental value, and possessing broad prospects for widespread application.

The application discloses a kind of high-performance outdoor full package imitation wood composite board and preparation method thereof, relate to polyurethane composite board technical field, the full package imitation wood composite board includes base board, and the polyurethane material of setting in the lower surface and the four around of base board, and the resin material of setting in upper surface.Its preparation method includes the following steps: pouring polyurethane material in the silica gel mould after surface treatment, place base board, mould pressing, make the polyurethane material with wood texture around and lower surface of base board composite, obtain intermediate product A;Resin material is rolled on the upper surface of intermediate product A, and is dried, to obtain full package imitation wood composite board;The silica gel mould after surface treatment is prepared by transferring real solid wood board texture.

The invention relates to the technical field of halogen-free phosphorus flame-retardant materials, in particular to a halogen-free phosphorus flame-retardant epoxy resin composition and application thereof in a high-heat-resistance copper-clad plate, and the halogen-free phosphorus flame-retardant epoxy resin composition comprises the following raw materials: novolac epoxy resin, a flame retardant, 2-ethyl-4-methylimidazole, a curing agent, fused silicon dioxide and flaky boron nitride. According to the flame retardant, a polyether amine flexible chain segment in a molecular structure of the flame retardant is compatible with an epoxy resin matrix, so that the possibility of phase separation and interface defects is reduced, and the mechanical property level of an epoxy resin cured product is favorably maintained while the flame retardant property is ensured; the epoxy group at the tail end enables the flame retardant to participate in a curing reaction, and is anchored in an epoxy three-dimensional network through a covalent bond, so that the risk of migration and precipitation of the flame retardant is reduced, and the durability and stability of the flame retardant property are ensured.

The application discloses a boride double-scale synergistically reinforced high-manganese steel-based wear-resistant casting and a preparation method thereof, and belongs to the technical field of wear-resistant metal materials and special casting. The casting takes high-manganese steel as a matrix, adopts micron-level TiB2 and nanometer-level ZrB2 to form double-scale boride reinforcing phases, controls the distribution of the reinforcing phases through a powder core wire mesh weaving technology, and forms a metallurgical bonding interface through spray deposition and isothermal annealing. The synergistic improvement of tensile strength, impact toughness and wear resistance is realized. The product is suitable for high-stress wear environments in the mining, metallurgy, building material and other industries, effectively solves the technical pain point that the strength and toughness of traditional high-manganese steel are difficult to be considered, the process is stable and controllable, and differential strengthening can be realized, and the product has industrial application value.

This invention relates to the field of laser cladding technology, specifically to a toughened and reinforced laser cladding alloy powder and its preparation process. It solves the problem of poor hardness and toughness of the cladding layer formed by existing laser cladding alloy powders during use. This laser cladding alloy powder incorporates scandium / erbium-loaded nano-silica and tannic acid-hydroxypropyl cellulose-coated boron nitride. Loading scandium and erbium onto the nano-silica improves the wear resistance and tensile strength of the cladding layer. Coating the boron nitride surface with tannic acid-hydroxypropyl cellulose powder improves the wettability between boron nitride and the metal matrix, reducing interface defects. The synergistic effect of rare earth elements and boron nitride reduces porosity and cracks in the cladding layer. It also improves density by refining grains and strengthening interfacial bonding, further enhancing the material's wear resistance and tensile strength, ensuring service life and reliability under high temperature and high stress environments.

The application relates to the technical field of composite materials, and discloses a preparation method of a multilayer composite core body, which comprises the following steps: pretreatment, spraying treatment, core composite material preparation, compounding and curing forming; the surface of a fiber base layer is chemically modified through functional pretreatment, the wettability and reactivity of the fiber surface are improved, the different fiber layers with different functional characteristics can be more closely and stably combined, and therefore the integrity, reliability and durability of the multilayer composite core body structure are enhanced; through spraying treatment, functional particles are uniformly loaded on the surface of the fiber base layer in the form of a stable dispersion liquid; the functional particles have good compatibility and bonding force with the fiber base and the interlayer composite material after being treated and surface-modified in a specific manner, the core body is endowed with specific surface functions, the interface bonding between the fiber and the base is enhanced, and the functionality, uniformity and structural strength of the core body are improved.

This invention discloses a precipitated silica dispersant for rubber, its preparation method, and its application, relating to the field of rubber additives. The precipitated silica dispersant for rubber is made from raw materials comprising the following proportions: modified vegetable oil and hydroxide, wherein the molar ratio of the modified vegetable oil to the hydroxide is 1:(0.3-0.6), and the modified vegetable oil is copolymerized from vegetable oil monomers, benzene ring unsaturated monomers, and cashew nut phenol. This application provides an environmentally friendly and safe precipitated silica dispersant that can significantly improve the dispersibility of precipitated silica in rubber compounds while simultaneously improving the mechanical properties of the rubber compounds.

This invention discloses a method for preparing van der Waals metal thin films. The method includes the following steps: S1, coating a polyvinyl alcohol (PVA) film onto the surface of a supporting substrate; S2, depositing a metal film on the surface of the PVA film to obtain an intermediate; S3, placing the intermediate in water at 60-80°C to remove the PVA film, obtaining a floating metal film; transferring the metal film to the surface of a target substrate, and bonding the two together using van der Waals forces to obtain the final product. This invention utilizes the controllable dissolution properties of PVA, achieving the separation and transfer of the metal film from the supporting substrate using deionized water, avoiding the use of toxic chemical solvents and interface damage caused by high-energy bombardment. The method is simple, environmentally friendly, and can be widely applied to the preparation of van der Waals heterostructures such as metal-semiconductor and metal-insulator structures.

The application provides a polymethyl methacrylate product and a preparation method thereof. The preparation method of the polymethyl methacrylate product comprises the following steps: S1. mixing a resin matrix, a toughening agent, an antioxidant and a light stabilizer to obtain a mixture; the resin matrix comprises a polymethyl methacrylate resin; the toughening agent comprises a core-shell structure toughening agent and a polyester-based toughening agent; the core-shell structure toughening agent comprises a core and a shell layer; the core comprises polybutyl acrylate, and the shell layer comprises polymethyl methacrylate; S2. melt blending, extruding and granulating the mixture, and drying, injection molding, cooling and annealing. In the application, the core-shell structure toughening agent and the polyester-based toughening agent can synergistically improve the toughening effect.

The application belongs to the technical field of aerogels, and particularly relates to a polypyrrole reinforced polyimide aerogel and a preparation method and application thereof. The application directly uses a macroscopic ice block as a hard template for preparation of polypyrrole, and through introduction of a cyclic molecule hydroxypropyl-beta-cyclodextrin with a hydrophilic-hydrophobic dual function as an array growth aid, a polypyrrole array with a self-supporting structure is prepared. The array is in-situ compounded with polyamic acid, and through freeze drying and thermal imidization, a polypyrrole reinforced polyimide aerogel is prepared. The aerogel has high mechanical strength and high conductivity, and can be used as a conductive reinforcing filler for polyurethane in the technical field of 3D printing, solves the compatibility problem of the conductive polypyrrole and a polyurethane resin matrix, and further improves the mechanical properties of the polyurethane on the basis of improving the antistatic performance of the polyurethane.

The invention discloses a two-region InSb-based quantum dot Mirco-LED capable of efficiently emitting near-infrared and a preparation method thereof.The preparation method comprises the steps that firstly, a pixelated pattern is formed on a transparent conductive substrate through photoetching and wet etching, and then functional layers such as a hole injection layer, a hole transmission auxiliary layer, an InSb quantum dot light-emitting layer and an electron transmission layer are prepared in sequence; and finally, manufacturing the device through vacuum evaporation of an electrode and ultraviolet curing packaging. According to the invention, an environment-friendly and nontoxic InSb quantum dot material is adopted, efficient emission of a wave band of 1000-1700nm is realized through a pixelated structural design and a multi-layer spin-coating process, and meanwhile, the device has excellent miniaturization integration level and long-term stability; the technical problem that a traditional near-infrared light-emitting device is difficult to consider the aspects of wavelength range, environmental friendliness and integration level is effectively solved.

The invention discloses a gallium oxide heterojunction diode with a vertical structure and a preparation method. The gallium oxide heterojunction diode comprises a gallium oxide epitaxial wafer; the P-type oxide is located in the middle area of the upper surface of the gallium oxide epitaxial wafer; the two sides of the P-type oxide are of an arc-shaped structure, and the curvature radius of the arc-shaped structure is smaller than 3 microns. The SiO2 field plates are located on the two sides of the P-type oxide and make contact with the P-type oxide; the anode electrode is located on the P-type oxide and part of the SiO2 field plate; and the cathode electrode is positioned on the lower surface of the gallium oxide epitaxial wafer. According to the device structure designed by the invention, reverse leakage current is effectively inhibited, the breakdown voltage of the device is effectively improved, and the performance and reliability of the device are greatly improved.

The invention belongs to the technical field of organic photoelectric materials, and particularly relates to a nitrogen-containing heterocyclic compound and an organic electroluminescent device thereof. According to the nitrogen-containing heterocyclic compound provided by the invention, through accurate design and coordinated regulation of a molecular structure, an energy barrier of electron transmission is effectively reduced, and efficient electron injection and transmission are realized, so that a device can achieve high brightness and high current efficiency under low driving voltage, and the power consumption of the device is reduced. The nitrogen-containing heterocyclic compound provided by the invention has a very good crystal structure and film form, and can prolong the service life and work stability of a device. Meanwhile, the nitrogen-containing heterocyclic compound provided by the invention also has proper HOMO energy level and LUMO energy level, can be well matched with an adjacent organic functional layer in energy level, can effectively reduce interface defects and charge recombination, and improves the overall photoelectric conversion efficiency and stability of a device.

The application discloses PBS laminating material and a preparation method and application thereof, and belongs to the technical field of high polymer materials. The PBS laminating material comprises a functional layer A and an adhesion layer B which are directly attached to each other, the functional layer A comprises polyglycolic acid, surface modified bamboo powder, a multifunctional epoxy compatibilizer, a carbodiimide stabilizer, an antioxidant, a nucleating agent, a laminating rheological aid and a polybutylene succinate-based resin, and the adhesion layer B comprises a functional polybutylene succinate-based adhesion resin, a multifunctional epoxy chain extender, an antioxidant and PBS and / or PBSA. In the preparation, the PBS-based resin is first made into a continuous phase, then the surface modified bamboo powder is pre-wetted and dispersed, and then the PGA is added in the later stage and the residence time is controlled, so that the obtained material has high rigidity, good film forming stability, paper base adhesion and heat sealing performance, and is suitable for food packaging paper, paper cups, paper bowls, express packaging paper and paper-based heat sealing packaging.

This application discloses a dielectric gradient coating for insulating separators, its preparation method, and its application, belonging to the technical field of electrical equipment insulation materials. The method includes the following steps: (1) adding ethylenediamine and perfluorooctyltrimethoxysilane to a solvent to obtain a modified solution, and then adding nano-graphene to the modified solution to obtain fluoroammonia-modified graphene; (2) mixing the first and second dispersions prepared from the fluoroammonia-modified graphene and magnesium-aluminum hydrotalcite respectively to obtain electrostatic spraying liquids with different concentration gradients; (3) sequentially electrostatically spraying the electrostatic spraying liquids with different concentration gradients onto the surface of the separator to form a dielectric gradient coating, wherein the dielectric constant in the dielectric gradient coating increases from the inside to the outside. In this method, the fluoroammonia-modified graphene is uniformly dispersed in epoxy resin and improves the density of the epoxy resin, thereby increasing the bonding force between the coating and the substrate, and thus improving the service life of the insulating separator under high temperature and high humidity conditions.

The application belongs to the technical field of cable materials, and particularly relates to a cable insulation material for high-voltage switch cabinets and a preparation method thereof. The material comprises the following components in parts by weight: polyethylene resin 80-90 parts, methyl acrylate 1-3 parts, polyacrylonitrile / polyethylene imine nanofiber 3-6 parts, antioxidant 0.2-0.5 parts, and crosslinking agent 1-2 parts. The application forms a chemical bonding interface between the polyacrylonitrile / polyethylene imine nanofiber and the polyethylene matrix, and is modified by grafting methyl acrylate, thereby establishing covalent connection between the fiber and the matrix at the molecular level, effectively overcoming technical difficulties such as fiber agglomeration, interface debonding and electrical tree degradation in the existing polyacrylonitrile fiber / polyethylene physical blending insulation material system, and achieving not only good insulation under high-voltage alternating current working conditions, but also excellent mechanical strength and aging resistance.

The invention provides a large-area photovoltaic device PTAA hole transport layer and a preparation method thereof, and a perovskite cell, and the preparation method comprises the steps: dissolving PTAA in a green solvent of o-xylene and / or anisole, and forming a precursor solution with the concentration of 0.75-3 mg / mL; depositing on the surface of a substrate through a solution method process; then vacuum auxiliary deposition is carried out, and standing is carried out for 10-90 s under the vacuum degree of 10-100 Pa so as to precisely regulate and control solvent volatilization; and finally, annealing for 5-30 minutes at the temperature of 100-130 DEG C to obtain the PTAA hole transport layer. Through the synergistic effect of the green solvent system and the vacuum-assisted deposition process, the uniformity and compactness of the PTAA film layer on the large-area substrate are remarkably improved, and the defects of strips, water stains and the like are effectively eliminated; when the material is applied to a perovskite battery, upper perovskite can be induced to form a high-quality thin film, interface defects are reduced, and non-radiative recombination is inhibited.

The invention belongs to the technical field of graphene composite material preparation, and particularly relates to a high-conductivity graphene / copper composite cable and a preparation method thereof. The preparation method comprises the following steps: S1, carrying out surface cleaning on a copper wire substrate by adopting an argon ion beam at a preset grazing incidence angle to obtain a clean copper wire substrate; s2, performing surface stepped reconstruction on the clean copper wire substrate to obtain a surface reconstructed copper wire substrate; s3, arranging the surface-reconstructed copper wire matrix in a preset crystal orientation, performing graphene oriented growth treatment to obtain a composite wire, and performing graphene oriented growth treatment by adopting a gas-phase pulse chemical vapor deposition method or a liquid-phase carbon source dipping-high-temperature pyrolysis method; s4, the composite wire is subjected to controlled cooling by applying axial tension in an inert atmosphere, and the composite wire with a stable structure is obtained; and S5, guiding and twisting the composite wire with the stable structure to obtain the high-conductivity graphene / copper composite cable. The high-conductivity graphene / copper composite cable has excellent conductivity.

This invention discloses an impact-resistant coating for the inner wall of a single screw pump. The raw materials include epoxy resin, filler powder, an alkylating agent, a curing agent, and a solvent. The coating layer prepared by the method described in this invention exhibits good impact resistance and excellent impact performance. When applied to the inner wall of a single screw pump, it can be used effectively even in media with high impact loads, thus improving the durability of the single screw pump.

This invention belongs to the field of protective coating technology and discloses an environmentally friendly ceramic-graphene composite insulating protective coating and its preparation method. The coating comprises an aqueous epoxy resin, an inorganic ceramic precursor film-forming component, a core-shell-interface modified insulating graphene functional filler, an aqueous curing agent, and additives. The functional filler includes a graphene core, an Al2O3 insulating shell continuously coated on its surface, and an epoxy reactive organosilicon interface layer grafted onto the outer surface of the Al2O3 insulating shell. By first preparing the functional filler and then compounding it with the aqueous epoxy resin and the inorganic ceramic precursor film-forming component to form a film, the resulting coating possesses excellent insulation, protection, and adhesion stability, making it suitable for insulating and protecting metal substrate surfaces.

The application belongs to the technical field of building materials, and relates to low-thermal-conductivity concrete and a preparation method thereof. The application provides a preparation method of low-thermal-conductivity concrete, which comprises the following steps: modifying polypropylene fibers in a tannic acid solution and then modifying the polypropylene fibers in a polydimethylsiloxane solution to obtain modified polypropylene fibers; mixing a foaming agent and water to prepare a foaming solution; uniformly mixing cement, fly ash, the modified polypropylene fibers, an additive and water to obtain a mixture; foaming the foaming solution to generate foam, and then adding the foam into the mixture; and uniformly mixing to obtain the low-thermal-conductivity concrete. The application aims to solve the following technical problem: in the preparation process of foam concrete, although the addition of polypropylene fibers can effectively reduce the thermal conductivity of the foam concrete (to meet the low-thermal-conductivity requirement), the strength of the foam concrete is significantly reduced, and finally the low-thermal-conductivity performance and the high-strength performance of the concrete are difficult to be simultaneously considered.

The present application relates to a kind of light building materials containing vinasse and its preparation method and application, belong to light building material technical field, material includes cement, composite activated powder, modified reinforcing fiber, composite foaming agent, graded expanded perlite, shale haydite, weather-resistant reinforcing additive, waterproof plugging additive, heat preservation stabilizing additive, polymer of methyl oxirane and oxirane dimethyl ether etc. Component.Composite activated powder is the mixture of vinasse, slag powder, expandable graphite powder and nanometer silicon dioxide, is prepared after surface modification by silane coupling agent KH-560.Modified reinforcing fiber is short fiber made of glass fiber reinforced PP particle melt extrusion, is prepared after surface modification by silane coupling agent KH-550.Composite foaming agent is prepared by mixing vinasse protein solution, ammonium bicarbonate, wood fiber and tween-80.Each component is used in cooperation, interface modification is optimized, realizes the light weight of material, and improves strength, waterproof, anti-permeability and frost resistance.

This invention provides a perovskite solar cell, its fabrication method, and a photovoltaic module. The perovskite solar cell comprises a substrate layer, a conductive functional layer, an intermediate anchoring layer, a hole transport layer, a perovskite absorption layer, an electron transport layer, a conductive layer, and a metal electrode layer, stacked sequentially. The intermediate anchoring layer is made of a lanthanide metal salt. This invention utilizes the extranuclear multiple electrons of lanthanide metal salts and self-assembled monomolecular layers to achieve a multi-coordination structure, improving the adhesion and uniformity of the self-assembled monomolecules, mitigating interface defects, and thus enhancing the photoelectric efficiency of the photovoltaic module.

The invention relates to the technical field of laser additive manufacturing, and discloses a Sn-reinforced Cu-Fe-based composite material and a preparation method and application thereof. According to the invention, a trace amount of Sn element is introduced as an interface modifier, so that the wettability and bonding strength between Cu and Fe are effectively improved, interface defects are reduced, and a microscopic foundation is laid for synergistically exerting the heat conduction effect of Cu and the strengthening effect of Fe; 532 nm green laser is creatively adopted for selective laser melting forming, the laser energy absorption efficiency of Cu powder is greatly improved, stable melting under low heat input is achieved, burning loss and segregation of the Sn element are effectively restrained, and a supersaturated solid solution is formed through ultrafast cooling; the medium-temperature aging treatment at the temperature of 400-500 DEG C is specifically adopted, supersaturated atoms are driven to separate out a nanoscale strengthening phase, Cu matrix crystal lattices are purified to greatly recover the electric conduction and heat conduction performance, and meanwhile the high strength of the material is kept through precipitation strengthening.

This invention belongs to the technical field of sealant adhesive materials, specifically relating to a weather-resistant modified silane sealant and its preparation method. The preparation method of the weather-resistant modified silane sealant of this invention includes the following steps: S1, polypropylene glycol is sequentially subjected to alkoxide treatment and allylation treatment to obtain a polyether containing double bonds; the polyether containing double bonds and mercaptopropyltrimethoxysilane are used as raw materials for end-capping modification to obtain a silane-modified polyether material; S2, the silane-modified polyether material, filler, and plasticizer are mixed and vacuum stirred to obtain a mixture; S3, after cooling, a silane coupling agent, vinyltrimethoxysilane, catalyst, ultraviolet absorber, light stabilizer, and antioxidant are added to the mixture and stirred; the mixture is then discharged and sealed to obtain the weather-resistant modified silane sealant. This invention effectively improves the tensile strength of the material while ensuring good weather resistance of the sealant.