47results about How to "High electrical breakdown strength" patented technology

The invention relates to a fluorinated silicone rubber dielectric elastomer composite material and a preparation method thereof. The cross-linking density is changed, the amount of a high-dielectric semiconductor filler is regulated and controlled, and thus the composite material with good dispersion is obtained. The obtained composite material can obtain high dielectric constant with relatively low filling of the semiconductor filler, at the same time, the elastic modulus has no obvious improvement, the electric breakdown strength remains unchanged, and eventually relatively large electrodeformation is produced.

The invention discloses a method and device for detecting ultraviolet (UV) sterilization effect. The method comprises the following steps: (1) determining the relationship among the UV radiation strength, UV radiation time, and sterilization rate; (2) detecting the UV radiation strength; (3) obtaining the sterilization rate according to the UV radiation strength and a given radiation time. The device comprises a UV strength detection device, a time setting device, and a sterilization rate calculation module. The method and device can guarantee the effectiveness of a UV sterilization facility on killing bacteria (especially staphylococcus aureus), the sterilization process, which cannot be observed by naked eyes, can be evaluated and controlled, moreover, the UV sterilization facility can be stopped after the staphylococcus aureus is completely killed, the energy waste is avoided, and the practicality of the UV sterilization facility is improved.

The invention discloses a polytetrafluoroethylene nanoparticle (PTFE-NP)-filled composite tortuous porous membrane material. With polyimide (PI) nanofiber nonwoven fabric as a base material, holes of the base materials are filled with polytetrafluoroethylene nanoparticles (PTFE-NPs); the PTFE-NPs are 100-300nm in diameter and account for 30%-60% of total weight of the composite tortuous porous membrane material; and the PI nanofiber nonwoven fabric is electrospinning PI nanofiber nonwoven fabric of which the thickness is 9-38 microns, the porosity is 60%-80% and the fiber diameters are less than 0.5 micron. The nano composite tortuous porous membrane material disclosed by the invention has the advantages of high temperature resistance, heat shrinkage resistance, high voltage impact resistance, high current impact resistance and mechanical impact resistance, and is suitable for manufacturing various high-capacity and high-power lithium batteries or super capacitors as a safe battery diaphragm and a safe super capacitor diaphragm. The invention further provides a preparation method of the nano composite tortuous porous membrane material and an application of the composite tortuous porous membrane material as a battery diaphragm.

The invention discloses an epoxy resin encapsulating material, which is characterized by comprising 40 to 60 weight portions of EP828 epoxy resin or E51 epoxy resin, 80 to 130 weight portions of platy alpha Al2O3 ceramic powder, 5 to 10 weight portions of coupling agent - gamma-(2,3-epoxy propoxide) propyl trimethoxy silane, 8 to 12 weight portions of curing agent 590 and 0.1 to 1.5 weight portions of plasticizer - di-n-octyl phthalandione. The invention also discloses a method for preparing the epoxy resin encapsulating material, which comprises: firstly, dissolving the coupling agent into ethanol, adding the platy alpha Al2O3 ceramic powder into a mixture under the condition of stirring, and preparing alumina powder; and secondly, adding the plasticizer into the epoxy resin, uniformly mixing the plasticizer and the epoxy resin, adding the alumina powder into a mixture, performing mixing and degasification, adding the curing agent into the mixture, and performing vacuum defoamation and curing to obtain the epoxy resin encapsulating material. By adoption of the platy alpha Al2O3 ceramic powder as filler, the dielectric loss tangent value of the obtained material is reduced from 0.11 in the prior art to 0.02, and the electric breakdown strength is improved from 10kV.m<-1> in the prior art to 84-102kV.m<-1>.

The invention discloses a micro-nano composite multi-curved-pore membrane material. The polyimide (PI) nanofiber non-woven fabric is taken as the base material; the pores of the base material are filled by silicon dioxide particles; the diameter of the micro-nano silicon dioxide particles is 50-800 nm, accounting for 20-50% of the total weight of the micro-nano composite multi-curved-pore membrane material; and the PI nanofiber non-woven fabric is 9-38 um in thickness, and 60-80% in the porosity. The micro-nano composite multi-curved-pore membrane material prepared by the invention is high temperature resistant, thermal shrinkage resistant, high voltage resistant, high current impact resistant, and mechanical collision resistant, and suitable for being used as safe battery membranes and safe supercapacitor membranes for manufacturing various high-capacity and high-power lithium ion batteries or supercapacitors. The invention also provides a preparation method for the micro-nano composite multi-curved-pore membrane material, and application of the membrane material in being used as the battery membranes.

The invention discloses a nanocomposite multi-curved-porous membrane material. The nanocomposite multi-curved-porous membrane material takes polyimide (PI) nanofiber non-woven fabric as a base material, and nanometer zirconium dioxide (ZrO2) particles are filled in pores of the base material; the diameter of the nanometer ZrO2 particles is 50-100 nm, and the weight of the nanometer ZrO2 particles is 30-50% of the total weight of the nanocomposite multi-curved-porous membrane material; the thickness of the PI nanofiber non-woven fabric is 9-38 um, and the porosity is 60-80%. The nanocomposite multi-curved-porous membrane material has high-temperature resistance, thermal shrinkage resistance, high voltage and high current impact resistance, and mechanical collision resistance, so that the nanocomposite multi-curved-porous membrane material is suitable for being used as safety battery membranes and safety supercapacitor members for manufacturing various high-capacity and high-power lithium batteries or supercapacitors. The invention further provides a preparation method for the nanocomposite multi-curved-porous membrane material, and an application of the nanocomposite multi-curved-porous membrane material in being used as the battery membranes.

The invention discloses a three-layer structure lead zirconate titanate ferroelectric ceramic material and a preparation method thereof. The three-layer structure lead zirconate titanate ferroelectric ceramic material is of a sandwich structure, wherein a core layer of the material is a porous lead zirconate titanate ceramic layer, and the porosity of the core layer is 5-30%; the upper surface and lower surface of the material are compact lead zirconate titanate ceramic layers. The preparation method comprises the following steps: (a) respectively preparing porous lead zirconate titanate ceramic powder and compact lead zirconate titanate ceramic powder; (b) adding the porous lead zirconate titanate ceramic powder to the middle layer of a mold divided into three layers of space by using membranes, adding the compact lead zirconate titanate ceramic powder to the upper surface and lower surface of the mold, removing the membranes, briquetting and demolding; (c) removing plastic, sintering, machining and carrying out silver electrode firing, thus obtaining the ceramic material. The ceramic material provided by the invention has the advantages of high electric breakdown strength, low loss property of compact ceramics and the shock resistance of porous ceramics, so that the reliability and safety of the ferroelectric ceramic material in a pulse power supply are optimized.

Polypropylene having a melting temperature (Tm) of at least 151.0 DEG C. a xylene cold soluble fraction (XCS) of not more than 1.5 wt.%. and 18.0 to 50.0 wt.% of a crystalline fraction melting at or above 160 DEG C, wherein said fraction is determined by the stepwise isothermal segregation technique (SIST).

The invention relates to a power combiner (10) comprising a cooling body (40). The power combiner (10) hast at least one first electrical conductor (14) and one second electrical conductor (16). The first electrical conductor (14) and the second electrical conductor (16) are generally mostly arranged equidistant from the cooling body (40). In addition, the first electrical conductor (14) and the second electrical conductor (16) can be arranged alternatingly near or at a distance from the cooling body (40). Alternatively or in addition, the cooling body (40) can be arranged between the first electrical conductor (14) and the second electrical conductor (16). Alternatively or in addition, the first electrical conductor (14) and the second electrical conductor (16) can be divided mostly intoparallel conductor parts (14a, 14b, 16a, 16b), wherein the conductor parts (14a, 14b, 16a, 16b) are distanced from the cooling body (40) in such a way that the first electrical conductor (14) and thesecond electrical conductor (16) are generally mostly at equal distance from the cooling body (40).

The invention relates to a pulse power supply system and a neutron generator. Several paths of pulse voltages with different pulse widths and amplitudes can be provided for the neutron generator through four paths of pulse voltages, namely positive acceleration high voltage, negative acceleration high voltage, anode voltage and trigger voltage, so as to meet the working requirements of a vacuum arc ion source neutron generator. The positive acceleration high voltage is generated through the first secondary coil of a first pulse transformer T1, the trigger voltage is generated through a second pulse transformer T2, the anode voltage is generated through the second secondary coil of a first pulse transformer T1 and a main discharge capacitor C4, and the negative acceleration high voltage is generated through a third pulse transformer T3. The second secondary coil of the first pulse transformer T1 and the second pulse transformer T2 serve as a boosting transformer to boost a pulse power supply and also serve as an isolation transformer to solve the problem of suspension voltage, the insulation distance is effectively reduced by adopting a positive and negative acceleration pole structure, and three pulses form a loop to share one charging power supply, so the power supply system is very compact in structure.

Polypropylene having a melting temperature (Tm) of at least 151.0 DEG C, a melt flow rate MFR2 (230 DEG C) of more than 2.0 g/10min, a xylene cold soluble fraction (XCS) of not more than 1.5 wt.-%, 13C-spectroscopy, and a number average molecular weight (Mn) of not more than 110 kg/mol.

The invention discloses a cold-contraction type electric fluorosilicone sleeve and application thereof. The sleeve is prepared through enabling a -Si-CH=CH2 group in organic polyfluorosilicone and a -Si-H group in organic hydrogen-containing polyfluorosilicone to be subjected to hydrogen-silicon addition reaction in the presence of a noble metal catalyst, and then, carrying out continuous extrusion and vulcanization. According to the cold-contraction type electric fluorosilicone sleeve and the application thereof, the sleeve can be mounted without heating, is low in permanent deformation and can fully meet requirements as long as the inside diameter of a cable accessory is smaller than the outside diameter of a cable insulation by 2mm, and the vulcanization for the product is safe and non-toxic and is free of generation of waste gases, waste water and waste residues; and after vulcanization, the product has excellent expanding tear resistance, insulating performance, tracking resistance, acid/base resistance and ultraviolet resistance, is applicable to the terminal connection of various cables in cable lines and forms an electric power transmission network together with the cables so as to guarantee the connection of cable terminals.

The invention provides a ZnO varistor sheet with high energy tolerance and a preparation method thereof. First, a ZnO varistor ceramic sheet is produced; then silver electrode paste is printed on both sides of the ZnO varistor ceramic sheet, and then sintered to form a silver electrode to obtain two-sided varistors. ZnO varistor silver sheet with silver electrodes; finally prepare annular insulating covering material on the edge of the silver electrodes on both sides of the ZnO varistor silver sheet to make a ZnO varistor sheet covering the annular insulating material; the width of the annular insulating material covers the silver electrode The inside and outside of the edge line are not less than 0.5mm. No matter whether the prepared ZnO varistor sheet is encapsulated with an organic material or not, arcing or flashover will not occur on the edges and sides of the ZnO varistor sheet when subjected to a pulse current, and the reliability is high.

The invention discloses an insulating layer of a flexible film transistor and a preparation method of the insulating layer. The insulating layer of the flexible film transistor is a film of hydrocarbon-based polymer formed on a substrate. The preparation method of the insulating layer adopts hydrogen and acetylene gas as raw materials. Under the conditions of room temperature and vacuum, the film of hydrocarbon-based polymer is deposited on the substrate in a plasma enhanced chemical vapor deposition (PECVD) system so as to finish the preparation of the insulating layer of the flexible film transistor. The insulating layer disclosed by the invention has the advantages of good insulating performance and higher electric breakdown strength. Under the condition of room temperature, the preparation method enables the insulating layer to be well compatible with the flexible substrate. The insulating layer can be processed by adopting the PECVD process. The preparation method disclosed by the invention can be used for preparing the flexible film transistor, so as to further promote the development of flexible electron.

The present invention relates to an insulation device comprising an insulator having a chamber and an electrically insulating material in the chamber wherein the electrically insulating material comprises a dry composite foam. The invention also relates to a method of using the dry composite foam as an electrically insulating material and for manufacturing an electrically insulating device, comprising (a) providing an insulator having a chamber, (b1) either provides a mixture of at least polymer-based thermally expandable microhollow spheres in an expanded state and polymer-based thermally expandable microhollow spheres in an unexpanded state, (b2) either provides a mixture of at least two types of polymer-based thermally expandable microhollow spheres in an unexpanded state, the at least two types of thermally expandable microhollow spheres have different temperature ranges of expansion, and (c) foaming the mixture consisting of the thermally expandable microhollow spheres by heat treatment at a temperature in the range between 50 DEG C and 200 DEG C to form a dry composite foam as an electrically insulating material, the cavity of the insulating body is either filled with a mixture of thermally expandable micro-hollow spheres and foamed there, or the cavity of the insulating body is filled with the dry composite foam obtained by first foaming the mixture of thermally expandable micro-hollow spheres and the cavity of the insulating body is filled with the mixture of thermally expandable micro-hollow spheres.