42results about How to "Improve tracking resistance performance" patented technology

Systems and methods are disclosed that facilitate extending data retention time in a data retention device, such as a nanoscale resistive memory cell array, via assessing a resistance level in a tracking element associated with the memory array and refreshing the memory array upon a determination that the resistance of the tracking element has reached or exceeded a predetermined reference threshold resistance value. The tracking element can be a memory cell within the array itself and can have an initial resistance value that is substantially higher than an initial resistance value for a programmed memory cell in the array, such that resistance increase in the tracking cell will cause the tracking cell to reach the threshold value and trigger refresh of the array before data corruption/loss occurs in the core memory cells.

The invention discloses a uramido modified MQ silicon resin, and a preparation method and application thereof. The silicon resin is prepared from the following raw materials in percentage by weight: 20-40% of tetra-functionality silicon monomer, 5-30% of siloxane blocking agent, 15-30% of uramido silane coupling agent, 1-10% of catalyst, 5-20% of alcohol and 10-15% of deionized water. The preparation method comprises the following steps: stirring the deionized water, alcohol, catalyst and siloxane blocking agent at 70-80 DEG C to react; dropwisely adding the tetra-functionality silicon monomer/uramido silane coupling agent mixed solution, and reacting while controlling the temperature at 70-80 DEG C; after the dropwise addition, continuing stirring to react for 0.5-2 hours; and extracting, washing, and distilling under reduced pressure to obtain the uramido modified MQ silicon resin. The uramido modified MQ silicon resin has favorable compatibility with silicon rubber and silicon oil, and can obviously enhance the tracking resistance and mechanical properties of the addition-type liquid silicon rubber.

A silicone rubber composition comprising an organopolysiloxane component composed of (A) an organopolysiloxane gum having an alkenyl content of 0.001-2 mol % and (B) an organopolysiloxane gum having an alkenyl content of more than 2 mol % to 20 mol %, (C) microparticulate silica, (D) platinum or a platinum compound, (E) an organosilicon compound containing a nitrogenous organic group and an unsaturated hydrocarbon group and/or a benzotriazole, and (F) a curing agent cures into electrically insulating silicone rubber having a minimized tensile permanent set, improved mechanical strength, and tracking resistance.

The invention discloses a high-temperature-resistant and high-tracking-resistant rotating insulator and a preparation method thereof. The high-temperature-resistant and high-tracking-resistant rotating insulator is characterized in that the rotating insulator is a composite material prepared by curing and molding overlapped high-strength resin fiber prepreg at the temperature of 175-265 DEG C; the high-strength resin fiber prepreg is a fiber impregnated material which is formed by coating a high-strength resin adhesive on fiber yarns through a gluing machine and then baking the fiber yarns and is provided with a resin prepreg on the fiber yarns; the high-strength resin adhesive is prepared by mixing matrix epoxy resin, hydantoin epoxy resin, modified resin, a curing agent, filler, an accelerant and a solvent. According to the invention, the bending strength retention rate of the rotating insulator at the temperature of 200 DEG C is greater than or equal to 50%, the immersion resistance is greater than or equal to 106 Momega, PTI600V passes through the rotating insulator, and the arc resistance is greater than or equal to 180 seconds; and the insulator is suitable for being used as an insulation stress piece in large power transmission and transformation fields such as ultra-high voltage electrical appliances and high-voltage electrical appliances.

The invention discloses silicone rubber for a cold-shrinkable type power cable accessory, wherein the silicone rubber comprises the following components in parts by weight: 140 to 160 parts of methylvinyl silicone rubber raw rubber, 40 to 60 parts of white carbon black, 0.5 to 2 parts of nano titanium dioxide, 0.5 to 2 parts of nano cerium oxide, 1 to 2 parts of phenyl silicone oil, 4 to 6 partsof hexamethyldisilazane, 2 to 3 parts of deionized water, 0.2 to 1 part of a mold release agent, 0.1 to 0.5 part of alcohol modified chloroplatinic acid, 0.1 to 0.5 part of benzotriazole, and 0.5-2 parts of 2,5-dimethyl-2,5-di-tert-butyl hexane peroxide. The invention further provides a preparation method of the silicone rubber for the cold-shrinkable type power cable accessory. The silicone rubber for the cold-shrinkable type power cable accessory has excellent physical and mechanical properties, high temperature resistance, tracking resistance and the like.

The invention discloses silicone rubber with excellent tracking resistance and high heat conductivity. The silicone rubber is prepared from a methyl vinyl silicone rubber base body, inorganic nanoparticles, a vulcanizing agent, a cross-linking agent (TAIC), hydroxyl silicone oil and a silane coupling agent. The inorganic nanoparticles including aluminum hydroxide (ATH) and boron nitride (BN) are used as filler and are combined with the silicone rubber in a mixing and doping mode to obtain unitary and binary doped silicon rubber composite insulating material excellent in heat conductivity and tracking resistance. As ATH and BN are doped into the silicone rubber, tracking resistance and heat conductivity of the silicon rubber can be improved greatly.

The invention provides a high-hydrophobicity fluorocarbon composition as well as a preparation method and application thereof, and belongs to the technical field of polymer insulating materials. The high-hydrophobicity fluorocarbon composition is prepared from the following raw materials in parts by weight: 60 parts of fluorocarbon resin; 10 to 25 parts of a reinforcing filler; 50 to 100 parts ofan inorganic flame retardant; 0.2-1 part of a dispersing agent; 12-20 parts of curing agent. The composition can resist electric corrosion and high-temperature damage caused by the electric corrosion,has high hydrophobicity, excellent tracking resistance and flame retardance compared with common silicone rubber coating, and can expand the application field of fluorocarbon coating in the aspect ofelectrical equipment insulation, so that the high-hydrophobicity fluorocarbon composition has a good practical application value.

The invention provides a resin composition comprising a specific silicone-modified epoxy resin, a specific silicone-modified phenolic resin, black pigment, and an inorganic filler. The invention also provides a resin composition comprising a specific cyanate ester compound, a specific silicone-modified epoxy resin, and a specific phenol compound and/or silicone-modified phenolic resin.

An object of the present invention is to provide a polyamide imide resin composition having excellent in heat resistance, mechanical strength, and tracking resistance. The polyamide imide resin composition includes a polymer blend of a polyamide imide resin including an alicyclic structure and an aromatic polyamide imide resin.

The present invention includes a flame-retardant thermoplastic polyester resin composition which provides a molded article having excellent tracking resistance and excellent mechanical characteristics, while maintaining high flame retardancy; and a molded article which is obtained by molding the flame-retardant thermoplastic polyester resin composition. A flame-retardant thermoplastic polyester resin composition of an embodiment of the present invention contains 1-70 parts by weight of two or more (C) phosphorus-containing flame retardants that are selected from the group consisting of (C-1) condensed phosphoric acid esters, (C-2) phosphazene compounds and (C-3) organic metal phosphinates and 1-90 parts by weight of (D) a nitrogen-containing flame retardant per 100 parts by weight of the total of 50-95 parts by weight of (A) a thermoplastic polyester resin and 5-50 parts by weight of (B) a methacrylic resin.

The invention discloses a bis-amino-containing MQ silicone resin, and a preparation method and application thereof. The bis-amino-containing MQ silicone resin is composed of the following raw materials in percentage by mass: 18-48% of tetrafunctional silicon monomer, 8-32% of siloxane blocking agent, 1-4% of bis-aminosilane coupling agent, 3-14% of acid catalyst, 4-30% of alcohol and 12-20% of deionized water. The preparation method comprises the following steps: adding the siloxane blocking agent into a mixed solution composed of the deionized water, alcohol and acid catalyst, and carrying out prehydrolysis; and sequentially and dropwisely adding the tetrafunctional silicon monomer and bis-aminosilane coupling agent, and stirring at 60-80 DEG C to react for 0.5-2 hours. A small amount of bis-amino-containing MQ silicone resin can be added to obviously enhance the tracking resistance of the addition-type liquid silicone rubber and enhance the mechanical properties of the addition-type liquid silicone rubber to some extent.

The invention provides a silicone-modified epoxy resin composition comprising a silicone-modified epoxy resin having at least two epoxy groups, obtained from hydrosilylation reaction of an alkenyl-containing epoxy compound with an organopolysiloxane, a silicone-modified phenolic resin having at least two phenolic hydroxyl groups, obtained from hydrosilylation reaction of an alkenyl-containing phenol compound with an organopolysiloxane, black pigment, and an inorganic filler. Because of excellent tracking resistance, the epoxy resin composition is suited for encapsulating semiconductor devices.

The invention discloses a tracking-resistant addition type liquid silicone rubber composition and a preparation method and application thereof. The tracking-resistant addition type liquid silicone rubber composition is prepared from the following raw materials in parts by mass: 100 parts of vinyl silicone oil, 30 to 50 parts of white carbon black, 5 to 8 parts of hexamethyldisilazane, 1.0 to 3.0 parts of hydrogen-containing silicone oil, 1.0 to 3.0 parts of silicon dioxide grafted ureido siloxane, 0.04 to 0.08 part of 1acetenyl 1cyclohexanol and 10 to 25ppm of platinum catalyst. The silicone rubber composition disclosed by the invention has excellent tracking resistance and water resistance, the addition type liquid silicone rubber composition can still reach the 1A4.5 grade after being soaked in water for 5 days, the electrical erosion loss rate is basically unchanged, and the silicone rubber composition can be applied to outdoor insulation of high-voltage and ultrahigh-voltage powertransmission.

The present invention provides a silicone composition comprising components (A) to (F); (A) 100 parts by mass of a raw rubber-like, at 25 degrees C., organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom; (B) 5 to 100 parts by mass of silica powder having a specific surface area of 50 m²/g or more; (C) platinum or a platinum compound in an amount of 1 to 1,000 ppm by mass as a platinum atom, relative to the mass of component (A); (D) 0.01 to 5 parts by mass of a compound selected from an organic silicon compound having a nitrogen-containing organic group and an unsaturated hydrocarbon group, and benzotriazole and a derivative thereof; (E) an addition reaction curing agent other than said component (C), or an organic peroxide in an effective amount to cure the composition, and (F) 0.01 to 5 parts by mass of an aromatic hydrocarbon group-containing organopolysiloxane represented by the general formula (1) wherein a proportion of the number of the monovalent aromatic hydrocarbon group to the total number of the substituents R¹, R² and R³ is 41% or more and less than 46%.