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445results about How to "Improve thermal conductivity" patented technology

Graphene-containing high heat conduction polyvinyl chloride sheath material for cable, and cable

The invention discloses a graphene-containing high heat conduction polyvinyl chloride sheath material for a cable, and a cable with the graphene-containing high heat conduction polyvinyl chloride sheath material. The graphene-containing high heat conduction polyvinyl chloride sheath material reduces electric energy transmission loss. The graphene-containing high heat conduction polyvinyl chloride sheath material comprises, by mass, 100 parts of polyvinyl chloride resin, 0.05-3 parts of a heat conduction agent, 8-9 parts of an auxiliary heat conduction agent, 20-25 parts of a plasticizer, 0.1-0.5 parts of an anti-oxidant, 2.2-2.9 parts of a stabilizing agent, 0.5-3 parts of a lubricant and 37-53 parts of a filler. The cable sheath layer comprises polyvinyl chloride resin, a heat conduction agent, an auxiliary heat conduction agent, a plasticizer, an anti-oxidant, a stabilizing agent, a lubricant, a filler, a fire retardant and a pigment assistant. Compared with the existing sheath material, through cooperation of the heat conduction agent and the auxiliary heat conduction agent, the graphene-containing high heat conduction polyvinyl chloride sheath material has higher heat conductivity of 0.3W/mk or more and good heat dispersion effects, and reduces electric energy transmission loss or improves a cable current-carrying capacity.
Owner:江苏中超电缆股份有限公司

Accurate casting method for metal leakage type suction pouring titanium master alloy

InactiveCN101244454AImprove thermal conductivityImprove heat storage capacityPreparation proceduresMetal
The invention relates to a precision casting method for titanium master alloy by means of casting die bottom-drain vacuum suction casting, belonging to the technical field of precision casting methods for titanium master alloy. The precision casting method in the invention solves the problems in the prior processing technique for titanium master alloy, such as large workload, higher process costs, complex preparation processes, the liability of the alloy to the pollution of interstitial elements during the preparation procedure, poor compactness, and bad quality of the castings. The precision casting method comprises the following steps: making the casting die; conducting vacuum melting of the alloy in a non-consumable electrode arc furnace; turning over the melted titanium mater alloy into a suction casting crucible for remelting and keeping a certain degree of superheat; vacuumizing a vacuum chamber where the casting die is arranged, opening the suction casting button on the suction casting crucible, and enabling the liquid titanium master alloy to fill up the casting die under the actions of the self-gravity and pressure difference, thus obtaining the required casting member. The titanium master alloy casting member produced by the precision casting method in the invention has the advantages of full die filling, good surface quality, fine grains of the casting structure sized from 10 to 30 Mu m, correspondingly thinned dendritic crystal, less segregation, and compact structure.
Owner:HARBIN INST OF TECH

Microcapsule phase change energy storage material with photoluminescence characteristic and preparation method thereof

The invention discloses a microcapsule phase change energy storage material with a photoluminescence characteristic and a preparation method thereof. A wall material of a microcapsule is prepared from crystal-state zirconium oxide or element-doped crystal-state zirconium oxide, and a core material of the microcapsule is prepared from paraffin and organic phase change energy storage materials such higher aliphatic alcohol, acids and esters, wherein the mass percentages of the wall material and the core material can be respectively adjusted in the range of 30-70wt.% and 30-70wt.% as required, the average particle diameter of the microcapsule is 0.5-3 micrometers, and the wall thickness of the microcapsule is 0.15-0.3 micrometers. The microcapsule phase change energy storage material is capable of intensely absorbing ultraviolet light and near-infrared light at ultraviolet and near-infrared wavebands, emitting visible light with the wavelengths of about 500nm when being excited by light with the wavelengths of 296nm and 377nm, and generating visible light with the wavelengths of 600-700nm when being excited by near-infrared light with the wavelengths of 980nm, and meanwhile has the photoluminescence characteristic.
Owner:HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH

Shoulder wedge composite material and manufacturing method thereof

The invention discloses a shoulder wedge composite material and a manufacturing method thereof. The shoulder wedge composite material consists of the following raw materials in part by weight: 100 parts of natural rubber, 10 to 50 parts of carbon series nano thermal conducting filler, 10 to 35 parts of coarse particle size carbon black, 2 to 6 parts of octyl phenolic resin, 2 to 4 parts of surfactant, 1 to 8 parts of silane coupling agent, 1.5 to 9 parts of vulcanizing agent and the balance of other common aids. The preparation method comprises the following steps of: plasticating the rubber in an internal mixer, adding the coarse particle size carbon black, the carbon series nano thermal conducting filler, the octyl phenolic resin, the surfactant and the other aids into the internal mixer, mixing and controlling the temperature to be between 80 and 120 DEG C; adding the silane coupling agent into the mixture, controlling the temperature to be between 120 and 160 DEG C, and discharging the sizing material; adding a master batch and the vulcanizing agent into the internal mixer and discharging products until the temperature is 80 to 120 DEG C, wherein if the other aids contain scorch retarder, the scorch retarder and the vulcanizing agent are added together. The shoulder wedge composite material provided by the invention meets the requirements of mechanical properties, and is low in themogenesis, high in thermal conductivity, and excellent in machinability.
Owner:BEIJING UNIV OF CHEM TECH +1

Carbon fiber oriented thermal interface material and preparation method thereof

The invention discloses a carbon fiber oriented thermal interface material and a preparation method thereof. The preparation method comprises the following steps: 1, taking the thermal interface material to be leveled, wherein raw materials of the thermal interface material comprise heat conduction filler, and the heat conduction filler comprises carbon fibers and spherical aluminum oxide; (2) applying vibration to the thermal interface material, wherein the vibration direction is parallel to the thickness direction of the leveled thermal interface material; and (3) curing the thermal interface material to obtain the carbon fiber oriented thermal interface material. According to the invention, the one-dimensional linear chopped carbon fibers are directionally arranged along the thickness direction of the thermal interface material in a vibration manner, the carbon fibers are directionally arranged along the vibration direction, so that the heat-conducting filler is directionally arranged in the material to form a longitudinal heat-conducting channel, the heat conductivity coefficient of the thermal interface material is further improved, and the thermal interface material has a relatively good application prospect in the aspect of heat dissipation of a CPU or other electronic elements.
Owner:SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA +1

Heat conduction type ethylene vinylacetate copolymer hot melt adhesive and preparation method thereof

InactiveCN101935503AReduced processing and injection molding performanceImprove thermal conductivityNon-macromolecular adhesive additivesOxideAluminium oxide
The invention relates to a heat conduction type ethylene vinylacetate copolymer hot melt adhesive and a preparation method thereof. The technical problem to the solved in the invention is to overcome the two shortcomings in background technology. The provided hot melt adhesive has a high heat-conducting property without considerably reducing processing and injection module properties, and the coefficient of heat conductivity of the hot melt adhesive is as high as 1.0W/(m.k). The hot melt adhesive is prepared by smelting and blending ethylene vinylacetate copolymer, antioxygen, crosslinking agent and 10 to 75 mass percent of heating conduction filler, wherein the ethylene vinylacetate copolymer comprises 19 to 36 mass percent of vinyl acetate and the balance of ethylene, the weight-average molecular weight of the ethylene vinylacetate copolymer is 5,000 to 100,000, and the melt index of the ethylene vinylacetate copolymer at the temperature of 70 DEG C is 2.5 to 70.0; the heat conducting filler is solid oxide powder with a grain size of 0.5 to 50 mum, and preferably is alpha crystal aluminum oxide (Al2O3) powder; and the heat conducting filler consists of at least two kinds of powder particles of different grain sizes, and the diameter ratio of the small particles to the large particles is less than 0.741.
Owner:HANGZHOU NORMAL UNIVERSITY
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