5results about How to "Improve surface resistivity" patented technology

The application provides an epoxy resin with a super-hydrophobic layer and a preparation method thereof, and relates to the technical field of polymer insulating materials.The preparation method of the epoxy resin with a super-hydrophobic layer comprises the following steps: surface activation of a substrate: treating the surface of the cured epoxy resin substrate with plasma or alkali to introduce hydroxyl groups; constructing a silane anchoring layer; constructing a conductive inhibition layer; constructing a micro-nano rough structure layer: forming a micro-nano rough structure on the surface of the conductive inhibition layer by spraying or dipping nanoparticles; low surface energy modification; the super-hydrophobic performance of the epoxy resin is excellent: through the cooperation of the micro-nano rough structure and the fluorosilane low surface energy modification layer, the water contact angle is greater than or equal to 150 degrees, the rolling angle is less than 10 degrees, the formation of a water film on the surface can be significantly inhibited, and the adhesion and spreading of water in a humid environment are reduced; the wet-state insulation performance is greatly improved: the conductive inhibition layer introduces a large number of charge traps and prolongs the charge migration path.

This invention relates to the field of polymer materials technology, and discloses a high-elasticity rubber-plastic insulated cable composite material and its preparation method. The high-elasticity rubber-plastic insulation material comprises, by weight, 40-50 parts of EPDM rubber, 20-25 parts of polyolefin elastomer, 30-35 parts of modified calcined kaolin, 3-5 parts of composite antioxidant, 2-3 parts of silane coupling agent, and 1.5-2 parts of vulcanizing agent. During preparation, EPDM rubber and polyolefin elastomer are kneaded for 5-8 minutes, then modified calcined kaolin and silane coupling agent are added and kneaded for another 8-12 minutes, followed by the addition of composite antioxidant and vulcanizing agent and kneading for 3-5 minutes. Finally, the mixture is vulcanized in stages. The first stage vulcanization temperature is 155-160℃, and the second stage vulcanization temperature is 165-170℃. The insulating material prepared by this invention has excellent elasticity, outstanding resistance to flexural fatigue, stable insulation performance, high volume resistivity, excellent aging resistance, and tight interfacial bonding. It is suitable for use in high-voltage cable insulation layers, effectively extending the service life and stability of the cable.

The invention belongs to the field of heat-conducting polymer composite materials, and particularly relates to a high-heat-conductivity PEEK / PEI super-tough composite insulating material as well as a preparation method and application thereof. The high-thermal-conductivity PEEK / PEI super-tough composite insulating material contains polyether-ether-ketone, polyetherimide, a heat conduction agent, a compatilizer, an optional flexibilizer, an optional antioxidant and an optional lubricant. The heat conduction agent contains nano-scale aluminum oxide, micron-scale aluminum oxide and coated carbon fibers, and the coated carbon fibers comprise carbon fibers and hydroxyethyl methylacrylate-dimethylaminoethyl acrylate copolymers coating the surfaces of the carbon fibers. The high-thermal-conductivity PEEK / PEI super-tough composite insulating material provided by the invention has high toughness, thermal conductivity and insulativity at the same time.

This invention provides an adhesive polarizing film capable of suppressing the increase in surface resistivity of an adhesive layer under high-temperature conditions. According to the invention, an adhesive polarizing film is provided, which is composed of an adhesive layer and a polarizing film laminated together, wherein the adhesive layer is formed of an adhesive composition containing an adhesive and a conductive polymer, and the storage modulus (G') of the adhesive layer at 80°C is 20–1000 kPa.

The invention relates to a coal mine bio-based steel wire rope core flame-retardant conveyor belt and a manufacturing method thereof, and belongs to the technical field of conveyor belts, a core matrix adopts a blending system of bio-based polyamide elastomer and bio-based chlorosulfonated polyethylene, is derived from renewable resources, significantly reduces the carbon footprint of a product, and adopts a halogen-free flame-retardant system, so that the production cost is reduced. The environment and health risks of a halogen flame retardant are avoided, the high hydrogen bond density of the bio-based polyamide elastomer and the high polarity of the bio-based chlorosulfonated polyethylene form a synergy, and a special bonding formula of the m-methylene white system and the cobalt salt bonding accelerant is matched, so that the initial bonding strength and the bonding strength after thermal aging of the steel wire rope are enhanced, and the service life of the steel wire rope is prolonged. The problems that a steel wire rope is easily pulled out and layered in the later period of a traditional conveying belt are solved, the mechanical properties such as tensile strength and elongation at break of the covering rubber layer are superior to those of standard requirements, and heavy load impact and repeated flexing under the working conditions of long distance, large transportation volume and high speed of a coal mine can be borne.