110results about How to "Improve withstand voltage performance" patented technology

A low-temperature straight-welding polyurethane wire enamel without pin hole is carried out by preparing hydroxide radical component, preparing enclosed component and formulating wire enamel. It can be used for extended or bended zero pin hole below 340degree.

A radiation generating apparatus 30 according to the present invention including: a radiation generating tube 10 having a target 14, a tubular shielding member 18 that shields a part of a radiation generated from the target 14 and also has an aperture 21 through which the radiation generated from the target 14 passes, and an envelope 1 that has the target 14 so as to be brought into contact with the internal space thereof and also has the tubular shielding member 18 so as to protrude toward an external space thereof; a storage container 1 for storing the radiation generating tube 3 therein; and an insulating liquid 8 that comes in contact with the tubular shielding member 18 and the storage container 1, wherein the tubular shielding member 18 has a protruding portion P, and the protruding portion P is covered with a solid insulating member 9.

The invention relates to a method for producing a positive temperature coefficient thermistor for a surge suppressor. The compositions of raw materials in molar ratio are as follows: 1.011 percent of TiO2, 0.755 to 0.764 percent of BaCO3, 0.140 to 0.155 percent of CaCO3, 0.090 to 0.096 percent of SrCO3, 0.006 percent of Y2O3, 0.017 percent of SiO2, and 0.0008 percent of MnO2. When the diameter of the positive temperature coefficient thermistor prepared by the method is less than 6 millimeters, the voltage withstanding capacity is more than AC700V, and the resistivity is between 180 and 220 omega.Cm, thus the method can fully meet and adapt to the use requirements of the surge suppressor.

The invention relates to voltage-resistant insulating flame-retardant reinforced nylon 66 engineering plastic. The engineering plastics comprise the following components in percentage by weight: 30-60% of PA 66 resin, 1.5-9% of PPO resin, 2-5% of compatilizer, 10-20% of red phosphorus flame retardant masterbatch, 2-10% of voltage-resistant insulating modified filler particles, 0.01-35% of alkali-free chopped glass fiber, and 1-2% of other auxiliaries. The voltage-resistant insulating modified filler particles include at least one of calcined kaolin, mica and halloysite carbon nanotube, the other auxiliaries comprise aminosilane coupling agent, and the filler particles are treated by the aminosilane coupling agent, which accounts for 5 wt% of the filler particles. The nylon 66 engineering plastic has excellent voltage-resistant insulating property, good mechanical performance and flame retardancy; and can be used for preparing electrical and electronic components with voltage-resistant and flame retardancy requirements.

The invention discloses a GIS high-voltage box of an electric locomotive. The high-voltage box comprises high-voltage disconnecting switches, a vacuum circuit breaker 4, a current transformer 5, a voltage transformer 6 and a grounding switch 7 which are arranged in a middle seal box 1c, and the internal of the middle seal box 1c is filled with sulfur hexafluoride gas; a cable inlet end 8 and a cable outlet end 9 are arranged in the middle seal box 1c; the high-voltage disconnecting switches are electrically connected with a pantograph via the cable inlet end 8; the current transformer 5 is electrically connected with an internal circuit of the electric locomotive via the cable outlet end 9; a vacuum circuit breaker operation mechanism 10 is connected with the vacuum circuit breaker 4; a grounding switch operating mechanism 11 is connected with the grounding switch 7; and high-voltage disconnecting switch operating mechanisms 12 are respectively connected with the high-voltage disconnecting switches. The GIS high-voltage box of the electric locomotive can effectively avoid ground discharge of high-voltage components, reduce the space, which is occupied by the high-voltage components, at the top of the electric locomotive, and improve the mounting and dismounting efficiency.

A polypropylene film wherein, a percentage (125R%) calculated by measuring the dielectric breakdown voltage (V/[mu]m) of the film at 30 points in a 125 DEG C atmosphere, and dividing the difference between the maximum value and the minimum value among 20 points obtained by respectively excluding the 5 points having the greatest breakdown voltage and the 5 points having the lowest, by the average value of these 20 points is less than 50%; and a percentage (23R%) calculated by measuring the dielectric breakdown voltage (V/[mu]m) of the film at 30 points in a 23 DEG C atmosphere, and dividing the difference between the maximum value and the minimum value among 20 points obtained by respectively excluding the 5 points having the greatest breakdown voltage and the 5 points having the lowest, by the average value of these 20 points is less than 20%. The present invention relates to a polypropylene film having few insulation defects and minimal variance of dielectric breakdown voltage in high-temperature environments, and in particular there is provided a polypropylene film that exhibits high withstand voltage and reliability in high-voltage capacitor applications.

The invention relates to graphene lithium ion battery electrolyte, which comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is prepared from the following components: 5%-6.5% of hexamethyl disilazane, 0.5%-3.5% of octamethylcyclotetrasiloxane, 4.5%-8.5% of graphene and 0.3%-5.3% of vitamin E on the basis of total weight of the electrolyte. The graphene is added to the lithium ion battery electrolyte, so that the voltage resistance of the electrolyte can be greatly improved; the electrolyte is not easy to decompose at high pressure; corrosive substances in an electrolyte system and the corrosive substances dissociating on the surface of a positive electrode can be effectively removed by the octamethylcyclotetrasiloxane; a lead electrode surface is adsorbed in the charging and discharging process due to the addition of the hexamethyl disilazane; equivalently, the deposition potential of hydrogen is improved; precipitation of hydrogen can be reduced; the lithium ion battery is stored in a high-temperature state; the capacity retention ratio and the capacity recovery rate are high; and the cycle performance is excellent.

The invention provides a fluorine-containing resin of which the molecular structure contains multiple carbon-carbon double bonds in which at least two are spaced by a methylene. The invention also provides a preparation method of the fluorine-containing resin, comprising the step of performing condensation reaction and/or ring-opening addition reaction on the precursor of the fluorine-containing resin and the unsaturated fatty acid under the action of catalyst, wherein, the molecular structure of the unsaturated fatty acid contains in which at least two are spaced by a methylene. The invention further provides a conformal coating and printed circuit board containing the fluorine-containing resin. The adhesive attraction of the coating layer formed by curing the conformal coating containing the fluorine-containing resin to the printed circuit board reaches 5B, the rigidity reaches B level, the flexibility is 0.5mm, the surface energy is 16.56-17.51 mJ/cm<2>, the voltage resistance capacity is higher than 10000V; the completely cured printed circuit board coated with the conformal coating of the invention can not bubble in 50 circulations after being soaked in the water of 50 DEG C.

The invention discloses a method for preparing a high-thermal-conductivity coating for an aluminum-based copper-clad plate. According to the method, the heat conductivity coefficient of the coating is made to be larger than 3.0 W/K.m by adding composite thermal conducting filler; meanwhile, various solvent systems with different boiling points are adopted, solvents volatilize in a gradient mode during drying of the coating, the number of microbubbles in the coating is reduced, and the electric insulation performance and voltage resistance of the coating are improved; furthermore, organic elastic resin and micromolecule resin are introduced into a resin system, so that the elasticity of the coating is improved, and the coating performance and wettability of resin on inorganic filler are improved.

The invention discloses a high-thermal conductivity weather-resistant packaging material for microprocessors. The high-thermal conductivity weather-resistant packaging material for microprocessors comprises, by weight, 50-60 parts of unsaturated polyester resin, 12-18 parts of an ethylene-methacrylic acid copolymer, 5-7 parts of nano-oxide, 4-8 parts of ethylene glycol, 10-14 parts of silicone oil, 10-14 parts of a flame-retardant additive, 8-10 parts of a synergist aid, 1-3 parts of boron nitride, 4-6 parts of silicon carbide, 6-8 parts of graphene and 3-5 parts of a coupling agent. The packaging material has the advantages of good thermal conduction and thermal dissipation effects, low thermal impedance, good weather resistance, good flame retardation property and good sealing effect; and a preparation method of the packaging material has the advantages of low material cost, easily available raw materials, simple process, high use values and good application prospect.

The invention provides a fluorine-containing resin. The molecular structure of the fluorine-containing resin contains a plurality of carbon-carbon double bonds, a methylene group is between at least two carbon-carbon double bonds in all the carbon-carbon double bonds, and the fluorine-containing resin is a fluorine-containing epoxy resin. The invention also provides a preparation method of the fluorine-containing resin. According to the method, a fluorine atom-containing epoxy resin precursor and an unsaturated fatty acid with the molecular structure containing a plurality of the carbon-carbon double bonds and the methylene group between at least two carbon-carbon double bonds in all the carbon-carbon double bonds undergo a condensation reaction and/or a ring-opening addition reaction. The invention further provides a conformal coating containing the fluorine-containing resin of the invention, and a printed circuit board containing the fluorine-containing resin of the invention. The adhesion force of a coating layer formed after the curing of the conformal coating containing the fluorine-containing resin of the invention to the printed circuit board reaches 5B, the hardness reaches a B grade, the flexibility is 0.5mm, the surface energy is 16.56-17.51mJ/cm<2>, and the voltage resistance is higher than 10,000V; and no foaming appears after fifty cycles when the printed circuit board which is sprayed with the conformal coating of the invention and is completely cured is immersed in 50DEG C water.

The invention relates to a graphene electrode sheet and a manufacturing method, and a method for manufacturing a high specific-energy and ultra-high-power graphene supercapacitor by using the grapheneelectrode sheet and belongs to the new energy storage device technology field. The graphene electrode sheet comprises a current collector and a graphene electrode slurry. The graphene electrode slurry comprises, by weight, 75-93% of graphene, 2-10% of conductive agent, and 5-15% binder. The current collector is a foamed aluminum current collector. The specific surface area of graphene is 1000 to1500 m<2>/g, a tap density is 0.2 to 0.5 g/cm<3>, an aperture is 2 to 10 nm, a particle size is 7 to 10 micron, and a carbon content is greater than 99.8%. The content of an oxygen-containing functional group is less than 0.35 meq/g, a water content is less than 0.40%, and a total metal content is less than 100 ppm. The energy density of the graphene supercapacitor manufactured by the electrode sheet is 12 Wh/kg and a power density is 30.14 kW/kg.

The inveniton provides a cold-cathode tube lighting device which uniformly lights up a plurality of cold-cathode tubes with a common power supply and is downsized effectively by using a ballast capacitor. A substrate (50) is divided into as many blocks (2) as the number of cold-cathode tubes (20). Two conductor layers in each block (2) respectively include two foils (21A and 21B, 24A and 24B). The first foil (21A) in the first conductor layer is connected with a common low-impedance power supply. Between the two conductor layers, an area where the first foils (21A and 24A) overlap each other forms a first ballast capacitor (CB1), an area where the first foil (24A) and the second foil (21B) overlap each other forms a second ballast capacitor (CB2), and an area where the second foils (21B and 24B) overlap each other forms a third ballast capacitor (CB3). The second foils (21B and 24B) are connected to the first electrode (21) of a cold-cathode tube (20).