63results about How to "Low loss factor" patented technology

The invention provides a modified carcass ply compound of an all-steel radial tire. According to the modified carcass ply compound, resorcin is replaced with phenolic resin. The resorcin is replaced with modified phenolic resin Penacolite B-20-S, modified phenolic resin Elaztobond A250 and phenolic resin TYC-0219, the Mooney viscosity of a sizing material is increased, and the scorch time is prolonged; except for the condition that the resin TYC-0219 enables the vulcanizing time to be prolonged obviously, and little difference of other resin exists; the tensile strength and the stretching stress of vulcanized rubber are reduced slightly, and other physical and mechanical properties are not changed much; and storage moduli and loss factors are all reduced; and the drawing force between the sizing material and a coppered steel wire is increased obviously.

The invention relates to the technical field of engineering plastic, in particular to bookbinding machine motor installation base PBT engineering plastic and a motor installation base. The motor installation base PBT engineering plastic is prepared from the following raw materials in parts by weight: 50 to 70 parts of PBT, 5 to 60 parts of glass fiber, 6 to 12 parts of composite toughening agent, 0.5 to 1 part of lubricant, 20 to 30 parts of composite flame retardant, 1 to 2 parts of weather-proof agent, 1 to 2 parts of antioxidant and 4 to 8 parts of inorganic filler. The bookbinding machine motor installation base PBT engineering plastic prepared in the invention has excellent comprehensive mechanical property and processing property, further has lower dielectric constant and good fire resistance and insulation, can reduce the weight of the motor base when being applied to manufacturing the bookbinding machine motor installation base, improves safety performance, shortens a production and manufacturing period, improves product yield, reduces abrasion and has long service life and excellent comprehensive performance.

The invention relates to a formula of tread rubber of a low-rolling-resistance semi-steel radial tire. The formula is prepared from the following components: 20 to 30 parts of emulsion polymerized butadiene styrene rubber, 80 to 130 parts of solution polymerized butadiene styrene rubber, 5 to 20 parts of new-process carbon black, 50 to 125 parts of white carbon black, 2 to 15 parts of a super silane coupling agent Si747, 3 to 10 parts of environment-friendly oil, 2 to 6 parts of zinc oxide, 1.2 to 5.6 parts of stearic acid, 0.8 to 3.2 parts of sulfur and 1.2 to 4.2 parts of an accelerant NS. The tire produced by the formula provided by the invention has good environment-friendly property, low rolling resistance, high wear resistance and less generated heat, the oil consumption of vehicles can be reduced and the service life of the vehicle tire is prolonged.

The invention discloses a nano-silica / poly(conjugated diene) composite emulsion and a preparation method thereof. Based on emulsion dry basis, the nano-silica / poly(conjugated diene) composite emulsion comprises 0.1 to 5 parts of surface functionalization-modified nano-silica. The nano-silica / poly(conjugated diene) composite emulsion has granularity of 50 to 80nm, number-average molecular weight of 100000 to 120000, and molecular weight distribution of 2 to 3. The invention also discloses the preparation method of the nano-silica / poly(conjugated diene) composite emulsion.

The invention relates to high-toughness flame-retardant amorphous copolyester foam and a preparation method thereof. The amorphous copolyester foam is obtained by blending, foaming and molding amorphous copolyester and a multifunctional master batch, wherein the multifunctional master batch is prepared from 25-50 parts by weight of a toughening and compatibilizing low-melting-point carrier resin,40-60 parts by weight of a halogen-free flame retardant, 5-10 parts by weight of a tackifier and 2-5 parts by weight of an antioxidant by adopting internal mixer-single screw combination equipment. The obtained amorphous copolyester foam material has the excellent characteristics of high toughness, excellent elongation, oxygen index (LOI) being greater than or equal to 27%, combustion grade of B2or above, high compression strength, high shear strength and the like, and can be applied to the high-end fields of aerospace, wind power, rail transit and the like.

The invention discloses a millimeter-wave indoor intelligent passive coverage method. Direct irradiation coverage is employed in a perpendicular incidence region (21), and a passive reflector (3) is employed for irradiation coverage in a shadow region (22). A signal from a base station (1) is reflected by the passive reflector (3), and then passes through an indoor window and other parts which allow millimeter waves to penetrate easily to arrive at the shadow region (22). The position of the passive reflector (3) enables the number of total reflections of the signal of the base station (1) from the passive reflector (3) to the shadow region (22) to be small as much as possible and enables the path (5) from the passive reflector (3) to the shadow region (22) to be short as much as possible.The wave beam direction (61) of a reflection wave (6) of the passive reflector (3), the number of wave beams and the polarization direction (62) can be adjusted and changed in real time according tothe business demands. The method can reduce the path loss of the millimeter waves, improves the independence of an MIMO channel, and can adjust the number of wave beams and characteristics of the shadow region (22) in real time according to the business demands. The method is characterized in energy saving performance, wide working band and low cost, and is liable to be integrated with a conventional indoor environment.

The invention provides a capacitive strain sensor and a preparation method thereof, which belong to the technical field of sensor design and production. The capacitive strain sensor consists of a substrate, a first barium strontium titanate dielectric film layer, a PdCr electrode layer, a second barium strontium titanate dielectric film layer, and an Al strontium barium titanate dielectric film layer from bottom to top. 2 o 3 The protective layer, wherein the PdCr electrode layer is an interdigitated electrode structure. The present invention adopts the planar structure of interdigitated capacitance, and barium strontium titanate (Ba 0.5 Sr 0.5 TiO 3 ) as the dielectric material, PdCr as the electrode material, and the preparation technology of magnetron sputtering coating and photolithography technology are used to realize the higher temperature (500℃) of the capacitive strain sensor under the larger strain (2500με). The purpose of stabilizing work.

The invention discloses a modified rubber and a preparation method thereof. The modified rubber is prepared by mixing rubber latex (1) and a nano-silica / poly(conjugated diene) composite emulsion (2) and carrying out coagulation and demulsification coprecipitation, wherein a mass ratio of the dry basis of the rubber latex to the dry basis of the nano-silica / poly(conjugated diene) composite emulsion is 100: (0.1 to 100); based on the dry basis of the nano-silica / poly(conjugated diene) composite emulsion, the nano-silica / poly(conjugated diene) composite emulsion comprises 0.1 to 5 parts of surface functionalization-modified nano-silica; the nano-silica / poly(conjugated diene) composite emulsion has granularity of 50 to 80nm, number-average molecular weight of 100000 to 120000 and molecular weight distribution of 2 to 3; and the rubber latex is a homopolymer or a copolymer containing a poly(conjugated diene) compound and is prepared by emulsion polymerization.

The invention discloses an energy-saving textile whole core flame-retardant conveyor belt and a method for manufacturing the same. The energy-saving textile whole core flame-retardant conveyor belt comprises covering layers, textile whole belt cores and belt core impregnating adhesive. The covering layers are made of powdered butadiene rubber / chlorinated polyethylene / thermoplastic polyurethane elastomers which are used as main materials, and auxiliaries for reducing loss factors are added into the main materials. The energy-saving textile whole core flame-retardant conveyor belt and the method have the advantages that formulas and processes are optimized, accordingly, the loss factors (tan delta values at the temperatures of 60 DEG C) of the covering layers can be reduced to the greatest extent, and running resistance of the energy-saving textile whole core flame-retardant conveyor belt can be reduced; radial stress lines of the textile whole belt cores are made of aramid fibers and polyester fibers, accordingly, the energy-saving textile whole core flame-retardant conveyor belt is high in strength, has thin belt bodies and is light after being impregnated and plasticized, and energy consumption of the energy-saving textile whole core flame-retardant conveyor belt in running procedures can be reduced to a great extent; the energy-saving textile whole core flame-retardant conveyor belt is produced by facing forming and dynamic vulcanization processes by the aid of extruders, and the processes are simple and are low in energy consumption and high in production efficiency.

The invention relates to a low loss and high uniformity adhesive sheet and a method for preparing a multilayer microwave board. The adhesive sheet is composed of an upper thermosetting resin film and a lower thermosetting resin film of a fluorine-based composite film; the upper thermosetting resin film and The components of the lower thermosetting resin film are thermosetting resin, initiator and filler. In order to achieve specific functions, thermoplastic elastomers, flame retardants, antioxidants and plasticizers can be added to it; among them, thermosetting resin and thermoplastic elastic The body is the matrix, the cross-linking agent, flame retardant, antioxidant and plasticizer are the additives, and the filler is the reinforcing material; the additives and reinforcing materials are randomly distributed in the matrix; the thermosetting resin film is semi-cured or uncured. In the cured state, it has certain fluidity and is prepared on the upper and lower surfaces of the fluorine-based composite film through a coating process. The components of the invention exhibit high uniformity and do not contain fiberglass cloth, thus avoiding the impact of the "glass fiber effect" on high-frequency signal transmission.

The invention relates to an oil-extended carbon-black-extended styrene-butadiene rubber master batch, and a rubber composition and a preparation method thereof. The oil-extended carbon-black-extended styrene-butadiene rubber master batch is prepared by mixing and condensing an extender oil, carbon black slurry and a silicon dioxide / poly-conjugated diene modified styrene-butadiene rubber latex, wherein the silicon dioxide / poly-conjugated diene modified styrene-butadiene rubber latex is prepared by carrying out graft polymerization on a nano silicon dioxide / poly-conjugated diene functional composite emulsion and a styrene-butadiene rubber latex; and the functional composite emulsion introduces the nano silicon dioxide onto the molecular chain of the poly-conjugated diene. The rubber master batch and rubber composition disclosed by the invention greatly lower the generated heat when being used in tire treads, and have the comprehensive properties of excellent wet-road holding capacity and excellent abrasion resistance.

The invention relates to a low-loss high-uniformity bonding sheet and a preparation method of a multilayer microwave plate. The bonding sheet is composed of an upper thermosetting resin adhesive film and a lower thermosetting resin adhesive film of a fluorine-based composite film. The components of the upper thermosetting resin adhesive film and the lower thermosetting resin adhesive film are both thermosetting resin, an initiator and a filler, and a thermoplastic elastomer, a flame retardant, an antioxidant and a plasticizer can be added to the thermosetting resin, the initiator and the filler to achieve a specific function, wherein the thermosetting resin and the thermoplastic elastomer are matrixes, the cross-linking agent, the flame retardant, the antioxidant and the plasticizer are additives, and the filler is a reinforcing material; the additive and the reinforcing material are randomly distributed in the matrix; the thermosetting resin adhesive film is in a semi-cured or uncured state, has certain fluidity and is prepared on the upper surface and the lower surface of the fluorine-based composite film through a coating process. The components have the characteristic of high uniformity and do not contain glass fiber cloth, so that the influence of a glass fiber effect on high-frequency signal transmission is avoided.

The present invention provides a novel dicyclopentadiene-phenol and 2,6-dimethylphenol copolymer epoxy resin (molecular structure represented by a formula 1) with characteristics of excellent heat resistance, low dielectric constant Dk and low loss factor Df. The preparation of the novel dicyclopentadiene-phenol and 2,6-dimethylphenol copolymer epoxy resin comprises two steps: (1) carrying out a reaction on a (a1) dicyclopentadiene-phenol resin (formula 2) and (a2) 2,6-dimethylphenol in the presence of an acidic catalyst through a (a3) aldehyde-based compound to form a dicyclopentadiene-phenoland 2,6-dimethylphenol copolymer phenol formaldehyde resin; and (2) preparing the dicyclopentadiene-phenol and 2,6-dimethylphenol copolymer epoxy resin from the dicyclopentadiene-phenol and 2,6-dimethylphenol copolymer phenol formaldehyde resin and excess epichlorohydrin under a NaOH condition. According to the present invention, with the substitution of the copolymer epoxy resin into the glass fiber laminating plate formula composition, the popcorn cannot be generated after the pressure pot PCT for 2 h (water absorption test) and 288 DEG C tin welding heat resistance test for 10 min; and inthe formula, x is an integer of 0-5, y is an integer of 0-5, and R represents hydrogen, C1-C10 alkyl, phenyl, hydroxyphenyl and the like. The formulas are defined in the specification.

The invention relates to an oil-extended carbon-black-extended styrene-butadiene rubber master batch, and a rubber composition and a preparation method thereof. The oil-extended carbon-black-extended styrene-butadiene rubber master batch is prepared by mixing and condensing an extender oil, carbon black slurry and a silicon dioxide / poly-conjugated diene modified styrene-butadiene rubber latex, wherein the silicon dioxide / poly-conjugated diene modified styrene-butadiene rubber latex is prepared by carrying out graft polymerization on a nano silicon dioxide / poly-conjugated diene functional composite emulsion and a styrene-butadiene rubber latex; and the functional composite emulsion introduces the nano silicon dioxide onto the molecular chain of the poly-conjugated diene. The rubber master batch and rubber composition disclosed by the invention greatly lower the generated heat when being used in tire treads, and have the comprehensive properties of excellent wet-road holding capacity and excellent abrasion resistance.