64results about How to "Reduce volume resistance" patented technology

A coated layer type composite wave absorbing material containing carbon nanotubes is composed of the basic substrate consisting of the polymer chosen from rubber, resin and plastics and carbon nanotubes, and the coated layer consisting of paint and nano-zinc oxide. Its advantages are high effect to absorb radar waves and adjustable frequency range of wave-absorbing peak.

The invention discloses black polyurethane-urea elastic fiber added with a carbon nanotube and a preparation method thereof. In the elastic fiber, the carbon nanotube is used as black packing of spandex; after the carboxylation and amination treatment on the surface, the carbon nanotube can be uniformly dispersed in spandex and forms an effective chemical bonding effect with polymer molecules; the addition amount of the carbon nanotube is 0.01-1% of the mass of the polyurethane-urea elastic fiber. In the invention, the carbon nanotube is used as a coloring agent of black spandex for the first time, and the problem of difficult dispersion of the carbon nanotube in spandex and the shortcoming of weak bonding effect of a two-phase interface are avoided. The black spandex prepared by the method has good black effect and color fastness, high mechanical strength, high elongation, low volume resistivity and excellent antistatic effect; moreover, the black spandex has excellent heat resistance and high temperature resistance and can endure long-time high-temperature boiling while the retention rate of mechanical strength is high.

A SAW device comprises a single crystal piezo-electric strate (made, for example, of LiTaO3 or LiNbO3), and an interdigital transducer (IDT) formed of a material mainly containing Al and disposed on the piezo-electric substrate. The piezo-electric strate contains an additive (for example, Fe, Mn, Cu, Ti), and an orientation rotated by an angle in a range of 42° to 48° (more preferably 46°±0.3°) from a Y-axis toward a Z-axis about an X-axis. The IDT presents a normalized thickness h / λ (h: thickness of electrode, and λ: spacing between digits of the IDT) of 7% to 11%. A more appropriate substrate cut angle can be shown for the SAW device which employs a piezo-electric substrate containing an additive, to improve the electric characteristics thereof.

The invention relates to a nanometer semi-conductive non-woven fabric and a processing technology of the nanometer semi-conductive non-woven fabric. The nanometer semi-conductive non-woven fabric is made of carbon fiber new materials through the advanced technologies like the high-strength spun yarn assisted net new process, the nanometer technology, the foam terylene layer technology and vacuum drying. The nanometer semi-conducive non-woven fabric has the advantages of being superior in semi-conductive performance, high in anti-tension strength, low in surface resistance and volume resistance and not prone to fading under high temperature. Besides, 'C' black on the surface cannot drop, efficiency is high, energy is saved, and environmental friendliness is achieved in a manufacturing process. The nanometer semi-conductive non-woven fabric is mainly used in cable core insulating layers of mine cables with 6KV and more than 6KV high voltage, shipboard cables with 6KV and more than 6KV high voltage and large-cross-section power cables with 10KV or more than 10KV and copper conductor surface taped coverings, capable of resisting strong electric fields and static, and semi-shielding. The nanometer semi-conductive non-woven fabric is also applicable to the development of indoor anti-static devices and anti-radiation shielding layers of medical and maternity anti-radiation clothes.

The invention discloses an antistatic coating and a preparation method thereof. The antistatic coating is prepared from, by weight, epoxy resin, acrylic resin, an antistatic nano-filler, polyethylene glycol, tetrabutyl orthosilicate, gelatin, dipropylene glycol butyl ether, zinc acetate, an isobutyltriethoxysilane coupling agent, a leveling agent and a solvent. The antistatic coating prepared in the invention has the advantages of low volume resistance, good shielding performance, realization of the adhesion grade being 1 grade, short curing time, wide range of the use temperature, industry standard meeting, realization of no foaming, cracking or peeling phenomena of a surface coated with the coating, and good comprehensive performances.

Disclosed is a sputtering target, which contains an alkali metal, is composed of an Ib element, IIIb element and VIb element, and has a chalcopyrite crystal structure. The sputtering target has the chalcopyrite crystal structure composed of a Ib-IIIb-VIb element, said structure being suitable for manufacturing, by sputtering one time, a light-absorbing layer having the chalcopyrite structure composed of the Ib-IIIb-VIb element.

The invention provides a preparation method of an antistatic polylactic resin powder used for selective laser sintering. The method comprises the following steps: 1, dissolving polylactic resin in a ketone and / or ether organic solvent at a heating temperature to obtain a polylactic resin solution; 2, cooling the polylactic resin obtained in step 1 to precipitate a solid precipitate; and 3, adding assistants to a solid-liquid mixture obtained in step 2, uniformly mixing the solid-liquid mixture and the assistants, and drying the obtained mixture to obtain the powder, wherein the assistants comprise an antistatic agent, an antioxidant and a powdery isolating agent. The method has the advantages of simplicity in operation, easiness in operation, provision of a sintering raw material with excellent processing properties for the selective laser sintering, and provision of a new direction for processing and application of functional polylactic resin. The invention further provides the antistatic polylactic resin powder prepared through the method, and a selective sintering method adopting the antistatic polylactic resin powder as a sintering powder raw material.

The present invention provides a preparation method of glass fiber reinforced polylactic acid resin powder for selective laser sintering. The preparation method comprises: a) dissolving a polylactic acid resin in a ketone and / or ether organic solvent at a heating temperature to obtain a polylactic acid resin solution; b) cooling the polylactic acid resin solution obtained in the step a) to precipitate the solid; and c) adding an auxiliary agent to the solid-liquid mixture obtained in the step b), uniformly mixing, and drying to obtain the powder, wherein the auxiliary agent comprises ultra-short glass fibers, an antioxidant and a powder isolation agent. According to the present invention, the method is simple and easy to operate, the sintering raw material having excellent processing performance is provided for the selective laser sintering, and the new direction is provided for the processing and application of the functional polylactic acid resin. The invention further provides the glass fiber reinforced polylactic acid resin powder prepared according to the method, and a selective laser sintering method using the glass fiber reinforced polylactic acid resin powder as the sintering powder raw material.

The invention discloses a semi-conductive material for a super low-temperature resistant cable. Raw materials related to active ingredients for preparing the semi-conductive material and weight ratios are as follows: 50 to 60 parts of butadiene-acrylonitrile rubber, 20 to 30 parts of chloroprene rubber, 10 to 30 parts of ethylene-vinylacetate rubber, 1 to 2 parts of anti-aging agent 4010NA, 3 to 5 parts of vaseline, 1 to 2 parts of TMTD (tetramethyl thiuram disulfide), 1 to 2 parts of DM, 0.2 to 0.5 part of sulphur, 1 to 2 parts of dicumyl peroxide, 3 to 6 parts of zinc oxide, 2 to 4 parts of magnesium oxide, 40 to 55 parts of carbon black N330, 20 to 40 parts of conductive carbon black and 8 to 12 parts of plasticizer.

A coated layer type composite wave absorbing material containing carbon nanotubes is composed of the basic substrate consisting of the polymer chosen from rubber, resin and plastics and carbon nanotubes, and the coated layer consisting of paint and nano-zinc oxide. Its advantages are high effect to absorb radar waves and adjustable frequency range of wave-absorbing peak.

Disclosed is static electricity proof tile, which has volume resistance lower than conventional tiles, prevents bleeding, which typically occurs in static electricity proof tiles manufactured using a surfactant, blocks electronic waves and water vein waves, and has an excellent moisturization function. The static electricity proof tile (100) according to this invention includes an upper layer (10) and a lower layer (20) provided beneath the upper layer (10) and formed of synthetic resin material containing a surfactant, in which a barrier means (50) is interposed between the upper layer (10) and the lower layer (20) for preventing bleeding of the surfactant. Further, the static electricity proof tile can have volume resistance decreased to 106-1010, compared to conventional static electricity proof tiles, can prevent bleeding of the surfactant contained in the lower layer formed of synthetic resin material and also separation of the tile due to bleeding of the surfactant, and can block electronic waves and water vein waves.

The invention provides a conductive silver adhesive and a preparation method thereof. The conductive silver adhesive is prepared from the following components in percentage by weight: 10-20 percent of epoxy resin, 65-75 percent of silver powder, 1-10 percent of a curing agent, 0.1-0.5 percent of a curing accelerator, 10-20 percent of a diluting agent and 0.1-1 percent of an adjuvant. Compared with a traditional conductive silver adhesive, the conductive silver adhesive has the advantages of excellent electrical performance, remarkably reduced amount of silver powder, budget cost reduction and mechanical performance improvement. The conductive silver adhesive has excellent stability and application, and the preparation method is simple, has good controllability and is suitable for industrial production.

The invention belongs to the field of high polymer materials and particularly relates to a high-impact-resistance anti-static ultra-high molecular weight polyethylene composite material and a preparation method thereof. The composite material contains a product obtained by compounding multiwalled carbon nanotubes with ultra-high molecular weight polyethylene at an ultra-high rotation speed, wherein the mass percentage content of the multiwalled carbon nanotubes in the composite material is 0.5%-5%. The ultra-high molecular weight polyethylene composite material has anti-static performance, and the volume resistance of the composite material is 103-107 ohms; the composite material has excellent impact resistance, and compared with a pure ultra-high molecular weight polyethylene composite material, the impact resistance is increased by 52.2%-73.9%. The invention further provides the preparation method of the high-impact-resistance anti-static ultra-high molecular weight polyethylene composite material. The preparation method is simple in process, environment-friendly and safe.

The invention relates to a photosensitive compound, a solidifying film and a septum, which can form excellent pattern with size stability even if a thick solidifying film is obtained and will not decrease the volume resistance even if conductive materials like carbon are used as a shielding component. The photosensitive compound is characterized in that (i) photo-curing resin and / or photo-curing monomer and (ii) acrylic resin grains are the necessary components, wherein the average once grain size of the (ii) acrylic resin grains is 50 to 200 nm and the weight ratio of the (ii) acrylic resin grains to the (i) photo-curing resin and / or photo-curing monomer is 0.1 to 2.0. Besides, the photosensitive compound is applied to making the solidifying film and the septum.