13results about How to "High volume resistivity" patented technology

This invention relates to the field of insulating aluminum busbar technology, and in particular to an insulating aluminum busbar for high-voltage connection in a power battery system, its preparation method, and its application. An insulating aluminum busbar for high-voltage connection in a power battery system includes: a three-dimensionally bent aluminum alloy substrate; a ceramic insulating layer, which covers the outer surface of the three-dimensionally bent aluminum alloy substrate and is metallurgically bonded to it; and two conductive ends, which are located at both ends of the three-dimensionally bent aluminum alloy substrate, with a nickel sheet fixedly connected to each conductive end and covered with a heat-shrink tubing. This application achieves metallurgical bonding between the ceramic insulating layer and the aluminum substrate, resulting in extremely strong bonding and solving the problem of coating peeling. The two conductive ends located at both ends of the substrate ensure the conductivity of the high-voltage connection and provide secondary protection for the welded area through the heat-shrink tubing, improving connection reliability.

This application relates to the field of sealing materials, specifically disclosing an insulating sealing gasket for nuclear power equipment and its preparation method. The insulating sealing gasket for nuclear power equipment of this application comprises an outer layer material and an inner layer material, with the outer layer material covering the surface of the inner layer material. The outer layer material is composed of the following components by mass percentage: 50%-60% silane coupling agent modified phenolic resin, 35%-45% composite fiber, and 3%-5% epoxy functionalized silane bonding accelerator. The inner layer material is composed of the following components by mass percentage: 45%-55% fluorine-modified epoxy resin, 30%-40% polyimide fiber, and 10%-20% high-temperature resistant nano-reinforced microspheres. The insulating sealing gasket for nuclear power equipment of this application has the advantages of high pressure resistance and high temperature resistance.

The invention relates to the technical field of inorganic non-metal insulating materials, in particular to an insulating material resistant to high voltage breakdown at high temperature and a preparation method thereof.The preparation method comprises the steps of raw material pretreatment and homogeneous mixing, forming and low-temperature pre-sintering, high-temperature densification sintering, gradient cooling annealing and finish machining. By optimizing the combination of the base material, the reinforcing phase material and the functional modifier, the insulating material has excellent high voltage breakdown resistance and high volume resistivity in a high-temperature environment, and the reliability and stability of the material under extreme conditions are ensured; by adopting the preparation method, high densification and microstructure optimization of the material are realized, so that the mechanical strength and electrical performance consistency of the insulating material are improved.

The invention discloses a protective coating for the surface of an electronic component and a preparation method thereof, and relates to the technical field of coatings. The coating is prepared from the following raw materials in parts by mass: 100 parts of epoxy modified acrylate copolymer, 8 to 9 parts of butyl acetate, 6 to 7 parts of propylene glycol methyl ether acetate, 6 to 7 parts of isododecane, 4 to 6 parts of modified boron nitride nanotube, 3 to 5 parts of synergist, 0.2 to 0.4 part of 2-methylimidazole, 0.1 to 0.3 part of defoaming agent, 0.2 to 0.4 part of flatting agent and 0.1 to 0.3 part of sterilizing agent. The epoxy modified acrylate copolymer, the modified boron nitride nanotube, the synergist and other components are introduced, so that the adhesive force, impact resistance, wear resistance, weather resistance, aging resistance, dielectric strength, volume resistivity and high-frequency signal adaptability of the protective coating are effectively improved while the weldability of a lead of an electronic component is not affected. Therefore, the method has a wider application prospect.

The invention relates to the technical field of iron-silicon magnetic powder inductance processing, in particular to an iron-silicon magnetic powder inductance material and a preparation method thereof.The iron-silicon magnetic powder inductance material is prepared from, by weight, iron-silicon alloy, a composite insulation coating agent, a surfactant, ferric nitrate, citric acid and an adhesive solution; the preparation method comprises the following steps: ultrasonically dispersing phosphate and n-type semiconductor oxide nano powder in ethanol, adding a silane coupling agent, adjusting the pH value to 4.0-5.5, reacting at 60-80 DEG C for 2-4 hours, filtering and drying to obtain the composite insulating coating agent, the iron-silicon magnetic powder inductance material prepared through the method solves the key technical problems that iron-silicon magnetic powder is large in loss, low in magnetic conductivity and poor in design flexibility, the high-frequency performance and reliability are improved, and the urgent requirements for high frequency, miniaturization and high efficiency of power inductors in the fields of consumer electronics, new energy automobiles, 5G communication and the like are met.

This invention belongs to the field of ceramic materials technology and discloses a high-temperature, high-insulation 96 alumina ceramic and its preparation method. The material is made by mixing α-Al₂O₃ powder with a dopant, wherein the dopant is composed of TiO₂ and CaO mixed in a mass ratio of (1-3):(3-1). Its average volume resistivity at room temperature is higher than 10 Ω·cm. 15 The optimal component insulation resistivity can reach 1.75 × 10⁻⁶ Ω·cm at a high temperature of 500°C. 12 The preparation method involves mixing α-Al₂O₃ powder with dopants TiO₂ and CaO according to their doping content; mixing the raw material powder with anhydrous ethanol and then ball-milling; drying and sieving the ball-milled slurry; adding a binder to the obtained powder, sieving it again, granulating it, and pressing it into a green body; firing the green body after debinding to obtain the final ceramic sample. This invention utilizes Ca... 2+ Ti 4+ By doping and modifying the material, 96 alumina ceramics that meet the properties of coulombic electrostatic chucks were prepared. While reducing the sintering temperature, the resistivity was maintained, thus better meeting the practical application requirements.

The preparation method comprises the following steps: carrying out prepolymerization reaction on a hydroxyl-containing elastic polymer, a liquid aryl diisocyanate prepolymer, modified epoxy-acrylic resin and a catalyst in an inert atmosphere to obtain a precursor mixture; the preparation method comprises the following steps: sequentially carrying out silane coupling treatment and boron nitride coating treatment on multi-particle-size spherical aluminum oxide to obtain surface-functionalized composite powder; mixing a reactive diluent, a plasticizer, a dispersing agent and a defoaming agent, then adding the composite powder, and carrying out shear dispersion and defoaming treatment to prepare high-solid-content filler slurry with thixotropy; the precursor mixture and the high-solid-content filler slurry are mixed according to a preset proportion, and pouring sealant slurry is obtained; the pouring sealant slurry is injected into a mold to construct a heat-conducting passage, and then is cured and shaped, so that the pouring sealant material with high heat conductivity, good electrical insulating property and stability is provided.

This invention relates to the field of coating technology, specifically to a polyurethane topcoat for energy storage boxes that resists electrical aging and its preparation method. This invention utilizes the synergistic compounding of three functional fillers—mica powder, nano-zinc oxide, and barium sulfate—to form a multi-level barrier system within the coating, significantly improving volume resistivity, arc resistance, and corona aging resistance. All three are indispensable. Simultaneously, functional aluminum hydroxide, after hydrophobic treatment, maintains low hygroscopicity even in humid and hot environments, preventing insulation degradation due to moisture absorption, while also providing flame retardant and smoke suppression functions. The compounding of amine light stabilizers and antioxidants effectively resists ultraviolet aging and thermo-oxidative aging, ensuring an electrical performance retention rate of ≥85% after long-term outdoor use. Furthermore, hollow glass microspheres reduce coating density, facilitating the lightweighting of the energy storage box; they also form a heat insulation layer, reducing external heat transfer and contributing to energy-saving temperature control within the box.

This invention discloses an equipment insulation coating process based on live cleaning pretreatment, belonging to the field of power equipment curing coating technology. The process includes: preparing a live cleaning solution, spraying and drying the equipment surface; preparing a silane-side group-containing acrylate copolymer solution and controlling its hydrolysis; adding nano-alumina and polyvinyl alcohol to obtain a primer and spraying and curing it to form a base coat; preparing a composite filler by surface organic modification of hexagonal boron nitride and nano-silica with a silane coupling agent; mixing and grinding this filler with epoxy resin, thixotropic agent, curing agent, etc., to obtain an insulating coating; and applying this filler to the base coat and curing it through stepped temperature increases to obtain an insulating coating. This invention enhances adhesion through cleaning activation, chemical anchoring, and nano-pinning synergistically, and improves insulation by utilizing the orientation barrier and defect filling of the composite filler, while an anti-settling system ensures the uniformity and stability of the coating.

The invention discloses a self-sensing insulating material based on graphene gradient distribution and a preparation method, and belongs to the technical field of functional composite materials. The material is composed of an insulating polymer matrix and graphene dispersed in the insulating polymer matrix, and the core of the material is that the concentration of the graphene is in non-uniform gradient distribution along the thickness direction of the material, so that the material can sense the stress, strain or aging state through the resistance change of the material while maintaining the excellent insulating property. The preparation method comprises the following steps: preparing dispersion liquids with different graphene concentrations; constructing a gradient structure by adopting a layer-by-layer tape casting or gradient centrifugal sedimentation technology; and carrying out curing molding. The material provided by the invention realizes integration of insulation and sensing functions, can realize real-time and in-situ monitoring of the state of electrical equipment without an external sensor, and has the characteristics of high sensitivity, good reliability and long service life.

The invention discloses high-strength electrical epoxy resin and a preparation method thereof in the technical field of epoxy resin. The high-strength electrical epoxy resin comprises the following components in parts by weight: 30-50 parts of bisphenol F epoxy resin, 50-70 parts of bisphenol A epoxy resin, 15-25 parts of a functionalized epoxy monomer, 30-40 parts of a hyperbranched curing agent, 5-8 parts of a reactive diluent, 0.5-1 part of an antioxidant, 10-15 parts of aluminum hydroxide and 1-2 parts of a silane coupling reagent. By introducing the functionalized epoxy monomer and the hyperbranched curing agent, the technical effects of remarkably improving the tensile strength of the epoxy resin, improving the interfacial compatibility of the inorganic filler and the resin matrix, increasing the volume resistivity and reducing the dielectric loss are achieved.

The application discloses a composite heat insulation structure suitable for radio frequency sealing and plasma ablation, and relates to the field of electrosurgical instruments. The composite heat insulation structure is arranged in a non-working area of a surgical clamp and is used for limiting heat diffusion and non-target conduction in a multi-energy working condition. The composite heat insulation structure comprises a first functional layer and a second functional layer. The first functional layer is arranged outside a metal base of the surgical clamp and is used for limiting heat and current diffusion to the non-working area in a radio frequency sealing working condition. The second functional layer is arranged outside the first functional layer and is used for improving the electrical insulation stability in a wet environment in a plasma ablation working condition. The composite heat insulation structure is designed in layers and is matched with differentiated functional layers, and is specifically adapted to different working condition requirements of radio frequency sealing and plasma ablation, so that the pain point that a single structure cannot simultaneously consider high-temperature heat insulation and wet-state insulation is effectively solved.