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826results about How to "Good thermal conductivity" patented technology

Thermal conductive molding compound and preparation method thereof

The invention discloses a thermal conductive molding compound and a preparation method thereof. The thermal conductive molding compound consists of the following components by weight percent: 15-40% of thermal conductive filler A, 10-30% of thermal conductive filler B, 1-5% of thermal conductive filler C, 5-15% of reinforcing component, 0.05-0.5% of surface modifier and 0-2% of other additives. The preparation method comprises the following steps: adding the thermal conductive filler B in a mixer, adding the surface modifier for mixing, and then adding the thermal conductive filler C for further mixing to obtain a mixture I; adding the thermal conductive filler A in a high-speed mixer, and adding the surface modifier for mixing to obtain a mixture II; after uniformly mixing a plastic matrix with other additives, adding the mixture of the plastic matrix and other additives from the main feeding port of a twin-screw extruder; adding the mixture I and the mixture II from the main feeding port or a feeding port on one side downstream of the extruder; independently adding the reinforcing component from a feeding port on the other side downstream of the extruder; and obtaining the thermal conductive molding compound from the twin-screw extruder. The thermal conductive molding compound has excellent thermal conductivity and good mechanical property.
Owner:KINGFA SCI & TECH CO LTD +1

Composite shape-stabilized phase change material with light absorption and conductive properties and preparation method thereof

The invention provides a composite shape-stabilized phase change material with light absorption and conductive properties and a preparation method thereof. The material consists of 5-15 percent of porous carbon material and 85-95 percent of organic phase change material distributed in the porous carbon material, wherein the organic phase change material is distributed in the porous carbon material. The method comprises the following steps of: preparing a carbon material with the three-dimensional communicating porous property; heating and fusing the organic phase change material and casting the organic phase change material on the porous carbon material; shocking the mixture at the temperature of 100-120 DEG C for a certain time so as to uniformly distribute the organic phase change material in the porous carbon material; and grinding the mixture at room temperature, and pressing and forming the material in a die. The composite shape-stabilized phase change material has high heat conduction, light absorption and conductivity; the heat transfer efficiency of the phase change material can be obviously improved; and meanwhile, the solar energy and electric energy can be converted into heat energy at high efficiency and are stored in the phase change material, and the material is a photoelectric composite shape-stabilized phase change material.
Owner:PEKING UNIV

Foam metal composite phase change material heat storage temperature-difference power generation device

The invention relates to a foam metal composite phase change material heat storage temperature-difference power generation device. The device comprises a plurality of small separated sealed containers arranged on the outer wall of a high-temperature flue gas pipeline in a sleeved mode. The small separated sealed containers are filled with foam metal composite phase change materials. The outer sides of the small separated sealed containers are closely connected with the hot end of a temperature-difference thermoelectric power generation module through a thermally-conductive adhesive. The shape of the inner sides of the small separated sealed containers is the same as the shape of the outer wall of the high-temperature flue gas pipeline, and the inner sides of the small separated sealed containers make close contact with the outer wall of the high-temperature flue gas pipeline; the outer sides of the small separated sealed containers are planes connected with the hot end of the temperature-difference thermoelectric power generation module, and the cold end of the temperature-difference thermoelectric power generation module is connected with a radiating block. The radiating block is filled with circulating cooling water, and the outer side of the radiating block is connected with radiating fins. According to the device, the foam metal composite phase change heat storage materials are combined with temperature-difference thermoelectric power generation devices to generate power, and therefore the efficiency of temperature-difference thermoelectric power generation can be effectively improved. The device can be conveniently installed on a boiler pipeline or an automobile exhaust pipeline and is reliable in power generation performance.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Resin composition with high-heat, high-glass transition temperature for printed circuit board, prepreg and coating substance

The invention relates to resin combination with high thermal conductivity and glass transition temperature used for a printed circuit board. According to the weight percentage, the resin combination comprises brominated epoxy resin occupying 20 percent to 70 percent, hardening agent occupying 1 percent to 10 percent, accelerating agent occupying 0.1 percent to 10 percent, inorganic powder occupying 0 percent to 20 percent, high heat conducting powder occupying 5 percent to 85 percent, and processing auxiliary agent occupying 0 percent to 10 percent. The resin combination has the advantages of high glass transition temperature and heat conducting performance, excellent thermal resistance and flame resistance, which can be applied to the heat conducting insulating layer of the printed circuit board after being made into a high heat conducting preimpregnated body through a containing and soaking way or into a high heat conducting coating through a coating way, thus the printed circuit board has high heat conducting performance, and the heat quantity generated by the operation of the electronic elements on the printed circuit board can be rapidly dissipated to enhance the service life and the stability of the electronic elements.
Owner:NANYA PLASTICS CORP

High thermal-conductivity polymer composite material and preparation method thereof

The invention discloses a high thermal-conductivity polymer composite material. The high thermal-conductivity polymer composite material comprises the following components in percentage by weight: 60%-95% of epoxy resin and 5%-40% of hyperbranched polyaryl amide grafted ceramic thermal-conductivity filler particles. The invention further discloses a preparation method of the high thermal-conductivity polymer composite material. According to the high thermal-conductivity polymer composite material and the preparation method thereof disclosed by the invention, the hyperbranched polyaryl amide grafted ceramic thermal-conductivity filler particles and the epoxy resin are used materials to obtain the high thermal-conductivity functional ceramic thermal-conductivity filler/epoxy resin polymer composite material; and the composite material has high thermal conductivity, and higher thermal conductivity and heat engine performances in comparison with the conventional filler direct blending process. The polymer composite material disclosed by the invention has excellent thermal conductivity and can be used for greatly improving the thermal conductivity and mechanical performances of the polymer matrix under low thermal-conductivity filler mixing amount, and therefore, the polymer composite material has an extensive application value in the fields of machinery, electronics, chemical engineering and the like. The preparation method disclosed by the invention is simple and easy to operate, strong in controllability and capable of realizing large-scale production.
Owner:SHANGHAI JIAO TONG UNIV

Metal laser selective melting forming double-piston controllable preheating powder cylinder

The invention discloses a metal laser selective melting forming double-piston controllable preheating powder cylinder capable of respectively working in two states of single piston and double pistons. When the powder cylinder works in the state of single piston, firstly, a large piston basal plate in a forming cylinder is leveled; and then, the periphery of a cylinder body is heated by using a cylinder body heating ring, and a piston heating plate is used for heating a piston cover plate to realize indirect heating of a forming cylinder and metal powder in a powder feeding cylinder. When the powder cylinder works in the state of double pistons, firstly, a small piston basal plate is leveled; and then, powder in a small piston forming cylinder and a small piston powder feeding cylinder is uniformly heated by using the cylinder body heating ring and the piston heating plate. The powder cylinder adopts an integrated double-piston design; a small piston can be replaced and disassembled to realize the laser forming of metal components with different sizes; powder is saved; and meanwhile, the powder cylinder can be heated in all directions, so that the controllable powder preheating is realized, the powder heating is uniform, the temperature gradient is improved, and the deformation and the split of the components are reduced.
Owner:XI AN JIAOTONG UNIV

In-situ polymerization preparation method of spinning-level high-heat-conductivity graphene/nylon composite material

ActiveCN105949760AGood thermal conductivityExcellent spinnabilityGrapheneCvd grapheneElectrospinning
The invention relates to an in-situ polymerization preparation method of a spinning-level high-heat-conductivity graphene/nylon composite material, belonging to the field of high-polymer composite materials. The in-situ polymerization preparation method comprises the following steps: diluting and dispersing a graphene oxide concentrated solution and water, and carrying out ultrasonic oscillation to obtain a graphene oxide dispersion solution; adding the graphene oxide dispersion solution into a nylon monomer, heating and uniformly mixing, and carrying out stepwise heating polymerization; and carrying out after-treatment to obtain the graphene/nylon composite material. The in-situ polymerization method is adopted to solve the problems of poor dispersity and high aggregation tendency of the graphene in the nylon monomer, and the nylon monomer and the oxygen-containing functional group of the graphene oxide can form a firm chemical bond. The synthesized graphene/nylon composite material has favorable heat conductivity, and the heat conductivity coefficient is 0.23-6.12 W/(m.K). Besides, the graphene/nylon composite material has favorable spinning properties, and can be used for spinning by melt spinning, electrostatic spinning or any other spinning process.
Owner:BEIJING UNIV OF CHEM TECH
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