36results about "Heat-exchange elements" patented technology

The invention discloses a phase change energy storage thermoplastic composite material, which comprises the following components in percentage by weight: 5 to 30 percent of polypropylene, 10 to 40 percent of ethylene-propylene-diene monomer (EPDM), 20 to 75 percent of paraffin, 0.5 to 10 percent of cross-linking agent, 0.01 to 2 percent of antioxidant, 0.01 to 10 percent of processing aid and 0 to 10 percent of crosslinking aid. The components are subjected to dynamic vulcanization in one step in melting mixing equipment to obtain the phase change energy storage thermoplastic composite material. The phase change energy storage thermoplastic composite material has the processing characteristics of thermoplastic plastics, and has high breaking elongation, moderate hardness and flexibility; and the paraffin is coated in the crosslinked EPDM to form microcapsules, and the phase change energy storage thermoplastic composite material is excellent in shape retaining performance and low in percolation ratio and has the better application prospects in fields of construction, chemical engineering, energy and the like.

The present invention is directed to a reversibly adhesive thermal interface material for electronic components and methods of making and using the same. More particularly, embodiments of the invention provide thermal interface materials that include a thermally-reversible adhesive, and a thermally conductive and electrically non-conductive filler, where the thermal interface material is characterized by a thermal conductivity of 0.2 W/m-K or more and an electrical resistivity of 9×10¹¹ ohm-cm or more.

The invention discloses a thermoplastic cellulose-based solid-solid phase transition material and a preparation method thereof. The preparation method comprises the following steps: 1, drying cellulose or a cellulose derivative; 2, respectively dissolving a cross-linking agent and polyethylene glycol alkyl ether in an organic solvent I to obtain a cross-linking agent solution and a polyethylene glycol alkyl ether solution, adding the polyethylene glycol alkyl ether to the cross-linking agent solution in a dropwise manner, adding a catalyst, and reacting for 0.5-10h to obtain a prepolymer solution, wherein a mole ratio of the polyethylene glycol alkyl ether to the cross-linking agent is 1:1; and 3, dissolving cellulose in an ionic liquid to obtain a cellulose solution, adding the prepolymer solution, acid anhydride and a catalyst to the above obtained cellulose solution, carrying out a polymerization reaction for 2-24h to obtain a finally obtained mixture, adding the finally obtained mixture to deionized water or an organic solvent II for precipitation, repeatedly washing the above obtained precipitate with deionized water 2-3 times, and carrying out vacuum drying to obtain the thermoplastic cellulose-based solid-solid phase transition material. The phase transition material has a good thermal stability and a melting processing performance, and can be blended with a thermoplastic copolymer matrix for melting processing.

To provide a heat generating body which is able to relax symptoms such as stiff shoulder, low-back pain, muscular fatigue, menstrual pain, a symptom of poor circulation and in particular, can be suitably used for relaxation of a symptom of menstrual pain.

A heat generating body wherein a heat generating composition molded body resulting from molding a moldable heat generating composition containing surplus water as a connecting substance is interposed between packaging materials and the periphery of the heat generating composition molded body is heat sealed, which is characterized in that the packaging materials are each constituted of a substrate and a covering material; that the substrate is substantially planar and does not have an accommodating pocket; that the packaging materials each has a bending resistance of not more than 100 mm; that the packaging materials are each a non-elastic body at least at a temperature between 25° C. and 60° C., has a breaking strength of 500 g/mm² or more at 25° C. and has a breaking elongation of 30% or more at 90° C.; that the moldable heat generating composition contains, as essential components, an iron powder, a carbon component, a reaction accelerator and water, has a water content of from 1 to 60% by weight, does not contain a flocculent aid, a flocculant, an agglomeration aid, a dry binder, a dry binding agent, a dry binding material, a sticky raw material, a thickener and an excipient, contains the surplus water so as to have a water mobility value of from 0.01 to 20, has moldability due to the surplus water, with the water in the moldable heat generating composition not functioning as a barrier layer, and is capable of causing an exothermic reaction upon contact with air; that plural sectional exothermic parts as divided by a sectioned part which is formed by heat sealing are provided; that the heat generating body contains a region having a ratio of bending resistance in the orthogonal directions of 2 or more on the surface thereof orthogonal to the thickness direction of the heat generating body; that at least a part of the heat generating body has permeability to air; and that the heat generating body has a fixing measure on at least a part of the exposed surface thereof.

The invention relates to a high-thermal-conductivity high-electrical-conductivity carbon nano-grade composite material. The material is characterized in that a polymer with a mass percentage of 3-30% is stuck and coated on the surface of carbon-based micro-nano powder with a mass percentage of 70-97%, and press molding is carried out, such that the material is obtained. According to the composite material, a layer of polymer is coated on the surface of high-thermal-conductivity high-electrical-conductivity carbon-based micro-nano powder with a water suspension method, such that the high-thermal-conductivity high-electrical-conductivity carbon nano-grade composite material powder is prepared. Preparation efficiency is high. When the method provided by the invention is used in preparing the high-thermal-conductivity high-electrical-conductivity carbon nano-grade composite material, the method is simple and feasible. The content of the carbon-based micro-nano powder filling material is high. The method can satisfy actual requirements of large-batch productions. The prepared high-thermal-conductivity carbon nano-grade material has good electrical conductivity and thermal conductivity, and can be applied in 3D printing materials, chemical equipment heat exchangers, laptops, high-power LED lightings, flat panel displays, digital cameras, mobile communication products, and fields of related miniaturized and high speed electronic components.

Hydrofluoroolefins and hydrochlorofluoroolefins contaminated with acid and/or iron compounds are purified and stabilized by contacting the haloolefin with a solid adsorbent such as alumina and then combining the purified haloolefin with one or more stabilizers such as an epoxide. The purified, stabilized haloolefins thus obtained are useful in a wide variety of end-use applications, including, for example, as refrigerants, propellants, foaming agents, fire suppression or extinguishing agents, and solvents.

The invention relates to a thermal storage type vacuum tube which comprises a tubular glass outer shell, an open end of the glass outer shell is connected with a glass flange, the glass flange is connected with a metal end cover through the hot-pressing sealing technology, a protective cap of an exhaust nozzle is arranged at the other end of the glass outer shell, an exhaust nozzle which is integrally molded with the glass outer shell is arranged in the protective cap of the exhaust nozzle, a metal material box body is arranged in the glass outer shell, a solar energy selective coating is arranged on the outer surface of the box body, space between the glass outer shell and the box body is pumped into vacuum state through the exhaust nozzle, a water inlet and a water outlet are respectively formed on the metal end cover, the water inlet and the water outlet are communicated through a heat exchange tube arranged in the box body, and a working medium in the box body adopts solid-liquid phase change materials with phase change temperature of 60DEG C-80DEG C. The working medium in the box body adopts the solid-liquid phase change materials, when the solid-liquid phase change materialsachieve the phase change point, the materials are converted to liquid state from solid state, and a large amount of heat is absorbed, and the temperature of the phase change materials can be basicallymaintained constant. The thermal storage type vacuum tube can be widely applied in a variety of solar water heaters.

The invention discloses a ternary fatty acid/modified expanded vermiculite composite phase-change energy storage material. Modified expanded vermiculite formed by conducting acid activation treatment on a carbon sandwich type expanded vermiculite/carbon compound serves as a supporting substrate, a molten ternary fatty acid eutectic mixture is added, the ternary fatty acid/modified expanded vermiculite composite phase-change energy storage material is prepared through a vacuum impregnation adsorption method, and by weight, the ternary fatty acid eutectic mixture accounts for 39.7-64.4%. The obtained composite phase-change energy storage material has a high heat conductivity coefficient and a phase change enthalpy value, leakage is avoided, heat stability is good, the preparation method is simple, cost is low, energy is saved, the environment is protected, the problem that an existing energy storage material is low in phase change enthalpy value and low in heat conductivity coefficient is solved, the phase change temperature of the composite phase-change energy storage material can be adjusted and controlled through the variety of fatty acid and the mass ratio, and the application field of the composite phase-change energy storage material is further broadened.

The present invention provides a thermally conductive grease composition which scarcely increases in hardness during high-temperature heating and has a minimized reduction in growth, containing:

• • (A) an organopolysiloxane including at least two alkenyl groups per molecule, the 25° C. kinetic viscosity being 5,000 to 100,000 mm²/s;
  • (B) a hydrolysable methyl polysiloxane, trifunctional at one terminus, represented by general formula (1)

(R¹ is a C_1-6 alkyl group, and a is an integer 5 to 100);

• • (C) a thermally conductive filler having a thermal conductivity of 10 W/m·° C. or greater;
  • (D) an organohydrogenpolysiloxane containing two to five hydrogen atoms directly bonded to a silicon atom (Si—H group) per molecule;
  • (E) an adhesion promoter having a triazine ring and at least one alkenyl group per molecule; and
  • (F) a catalyst selected from the group consisting of platinum and platinum compounds.

The invention relates to a method for preparing a rare-earth compound with a NaZn13 structure by the solid state diffusion of an interface, and belongs to the technical field of magnetic refrigeration materials. The method comprises the following steps of: preparing rare earth-enriched intermediate alloy and Fe-base silicon-containing intermediate alloy, processing the Fe-base silicon-containing intermediate alloy into a shape required by a material with the NaZn13 structure, and processing the rare earth-enriched intermediate alloy into a shape corresponding to that of the Fe-base silicon-containing intermediate alloy, so that the rare earth-enriched intermediate alloy can cover the surface of the Fe-base silicon-containing intermediate alloy; covering the surface of the Fe-base silicon-containing intermediate alloy by the rare earth-enriched intermediate alloy sheets to form a diffusion couple with a smooth combination surface; and after annealing the diffusion couple, taking the diffusion couple out, and quenching by using ice water to obtain rare earth-transition group metal compound which has the shape of the Fe-base silicon-containing intermediate alloy and the NaZn13 structure on the surface of the Fe-base silicon-containing intermediate alloy of the combination surface of the diffusion couple. By the method, the problem of poor machining performance of the rare earth-transition group metal compound is solved, and the method can be used for a magnetic refrigeration air-conditioning technology and a magnetic refrigeration technology.

The invention discloses a preparation method of a heat-conducting, electricity-conducting and electromagnetic-shielding multifunctional composite material, and belongs to the field of preparation methods of multifunctional composite materials. According to the preparation method of the heat-conducting, electricity-conducting and electromagnetic-shielding multifunctional composite material, nanometer ferrite, graphene, copper powder, carbon black, nanometer silicon carbide and a high polymer material are added in a formula. By means of the preparation method of the heat-conducting, electricity-conducting and electromagnetic-shielding multifunctional composite material, the electromagnetic-shielding effect of the composite material can be improved, and the tensile strength, the compressive strength and other material performance of the composite material can be improved.

The disclosed technology relates to a working fluid for a low global warming potential (GWP) refrigeration system that includes a compressor, where the working fluid includes an ester based lubricant and a low GWP refrigerant, and where the ester based lubricant includes an ester of one or more branched carboxylic acids where said branched carboxylic acid contains 8 or less carbon atoms. The disclosed technology provides commercially useful low GWP working fluids (commercially useful working fluids based on low GWP refrigerants) that do not have the solubility and/or miscibility problems commonly seen in low GWP fluids, including high viscosity fluids and applications.

The invention discloses nano-titanium carbon composite material with ultra-high thermal conductivity, which is characterized in that: the invention has the components by weight percentage: 40 - 85 percent of acidized expansive graphite, 5 - 40 percent of flake graphite nano power, 5 - 30 percent of mesophase nano carbon power and 5 - 30 percent of metal titanium nano powder. The production process is that: the four components are weighted and mixed under temperature of 300 to 500 DEG C in a high-temperature reaction furnace for 2 - 5 hours so as to obtain concentrated mixture solution used for making carbon at high temperature; the concentrated mixture experiences molding, rolling or ejaculating under pressure of 120 - 300MPa and at temperature of 300 - 500 DEG C, so as to form; then the formed material is carbonized under temperature 900 - 1000 DEG C for 1 - 12 hours, and graphitized under temperature of 2500 to 3000 DEG C for 1 - 12 hours. The invention has simple technique and low production cost; the thermal conductivity of the invention can be lifted to above 700W/mK.

The invention provides a refrigerating ice bag, a refrigerant and a preparation method of the refrigerant, and belongs to the technical field of refrigerating articles. The refrigerating ice bag comprises the refrigerant and a bag body. The refrigerant is sealed in the bag body. The refrigerant can be frozen into solid to be used by cooling the refrigerating ice bag. The refrigerant in the refrigerating ice bag has a high cold storage function and is slow in chilling, the initial cooling efficiency is high, and the temperature can be lowered quickly. The cooling effect lasts for a long time, the problem that the refrigerating ice bag is frequently replaced can be greatly reduced, and use cost of the refrigerating ice bag is lowered.

The invention belongs to the field of energy storage materials adopting mixed molten salt and particularly relates to a mixed molten salt type heat transfer and storage working medium and an application thereof. The mixed molten salt type heat transfer and storage working medium is characterized by comprising components in percentage by mass as follows: 20wt%-30wt% of Ca(NO3)2*4H2O, 41wt%-50wt% of KNO3,5wt%-20wt% of NaNO3 and 10wt%-31wt% of NaNO2. The application of the mixed molten salt type heat transfer and storage working medium is characterized in that the mixed molten salt type heat transfer and storage working medium is widely applied to the medium-high-temperature heat transfer and heat storage fields, such as solar thermal power generation and storage, wind power curtailment, photoelectricity curtailment and ''coal to electricity'' heat storage and supply or industrial waste heat recovery and storage. The cost of ingredients used for preparing the mixed molten salt is low, and the preparation process is very simple; the thermophysical property of the mixed molten salt is very stable, the separation phenomenon of certain ingredients cannot be caused in the use process, the molten salt has a good heat transfer performance in a liquid-state temperature zone, and the saturated vapor pressure is lower than double barometric pressure. The working medium has low corrosivity for metal and has a wide application range.

The invention discloses a composite phase change material for an LED thermal interface and a preparation method thereof. The composite phase change material consists of the following raw materials by mass percent: 18-45% of bismuth, 10-27% of tin, 35-55% of indium, 0-1% of antimony, 0-2% of gallium and the balance of colloidal graphite powder. Or, the composite phase change material consists of the following raw materials by mass percent: 44.51% of bismuth, 17.47% of tin, 35.77% of indium, 0.55% of antimony and the balance of colloidal graphite powder. Or, the composite phase change material consists of the following raw materials by mass percent: 34.75% of bismuth, 13.47% of tin, 49.53% of indium, 0.55% of antimony and the balance of colloidal graphite powder. Or, the composite phase change material consists of the following raw materials by mass percent: 18.97% of bismuth, 26.32% of tin, 51.48% of indium, 1.55% of gallium and the balance of colloidal graphite powder. The preparation method of the composite material comprises: 1) preparing materials; and 2) preparing samples: smelting uniformly mixed materials under protective atmosphere, and cooling to room temperature. The composite phase change material for the LED thermal interface is high in heat conductivity coefficient, wide in phase change temperature threshold, large in enthalpy of phase change and stable in performance, and can effectively lower thermal contact resistance.

The invention discloses a paste-like phase-change wave-absorbing heat-conducting material. The paste-like phase-change wave-absorbing heat-conducting material is prepared from the following components: a phase-change material, an electromagnetic wave absorbing material, base oil, insulating heat-conducting powder, a flame retardant and functional additives. The paste-like phase-change wave-absorbing heat-conducting material is prepared from the phase-change material, the electromagnetic wave absorbing material, the base oil, the insulating heat-conducting powder, the flame retardant and otherfunctional additives and has the following advantages that 1, the paste-like composite material is convenient to use, can be directly applied and is not limited by the space structure; 2, the interface wettability and the filling effect of the material are good, the portion between an electronic component and a radiator can be directly coated or filled with the material during use, and the operation is simple; and 3, the phase-change material changes along with the temperature form and absorbs surrounding latent heat.

Provided is: a thermally conductive silicone gel composition which has a high thermal conductivity, and has excellent gap-filling ability and repairability; a thermally conductive member comprising the thermally conductive silicone gel composition; and a heat dissipation structure using the same. The thermally conductive silicone gel composition comprises: (A) an alkenyl group-containing organopolysiloxane; (B) a straight-chain organohydrogenpolysiloxane containing an average of 2 to 4 silicon-bonded hydrogen atoms per molecule, at least two of the hydrogen atoms are being located on a side chain of the molecular chain, wherein the amount of silicon-bonded hydrogen atoms in component (B) is 0.2 to 5 mol with respected to 1 mol of an alkenyl group contained in component (A); (C) a catalyst for hydrosilylation reaction; (D) a thermally conductive filler; and (E) an alkoxysilane having an alkyl group with 6 or more carbon atoms per molecule.

The invention relates to a heat accumulation and heat conduction material and a preparation method thereof, in particular to a small expended and vitrified ball heat accumulation and heat conduction material and a preparation method thereof, aiming at solving the problems of being short in heat preservation effect, inflammable and harmful, easy to fall off, low in coefficient of heat accumulation, high in coefficient of heat conductivity, high in energy consumption as well as complicated in preparation method and technique of the existing organic thermal insulation materials such as a polyphenyl plate and the like. The small expended and vitrified ball heat accumulation and heat conduction material is prepared from a small expended and vitrified ball, wood fiber, getter, mildewproof agent, ultraviolet ray fiber, temperature adjustment agent and solar energy absorbent. The preparation method of the small expended and vitrified ball heat accumulation and heat conduction material comprises the following steps: evenly mixing the raw materials, heating and drying the mixed material by the mixture of gumming dirt and water, and preparing the small expended and vitrified ball heat accumulation and heat conduction material. The heat conduction material has the function of shielding heat preservation, strong durability, strong fireproof performance and strong freezing resistance; preparation method is simple and easy, and is convenient and fast in construction and free from pollution. The material and preparation method provided by the invention are wide in application prospects in industries of building, hygiene and medicine.

The invention discloses a method for preventing loss of a molten salt phase-change heat storage material by utilizing activated carbon, and belongs to the field of phase-change heat storage materials.The method comprises the following steps: (1) preparing molten salt particles; (2) adsorbing the molten salt phase-change material by activated carbon; and (3) mixing, pressing and sintering a sample. The molten salt phase-change material is adsorbed by adopting activated carbon, the large molten salt particles are prepared by utilizing a pressing and granulating method based on a stable phase-change heat storage material preparation process, the large molten salt particles are adsorbed by adopting the activated carbon, and finally activated carbon powder adsorbing the molten salt phase-change material and a binder are mixed, pressed and sintered to obtain a composite phase-change heat storage body. The preparation method is simple, low in cost and suitable for large-scale production, notonly solves the problem that the molten salt phase-change material is easy to lose in the use process, but also is long in use period and excellent in mechanical property, and has great significancefor expanding the use of the phase-change heat storage material.

The invention discloses phase change concrete and a preparation method thereof. The preparation method comprises the steps that firstly, organic metal is adopted for modifying graphene, then the modified graphene is compounded with a phase change base material, and a phase change material with high heat conductivity is obtained; and then microcapsules are adopted as a packaging form of the phase change material, and the strength of the concrete material is enhanced by adding steel fibers and nano silicon dioxide, so that the phase change concrete material with good heat storage capacity and good strength performance is obtained.

The invention belongs to the field of thermal insulation coatings, and particularly relates to a paraffin coated SiO2 color phase change microcapsule as well as a preparation method and application thereof. The paraffin coated SiO2 color phase change microcapsule takes a phase change microcapsule of silica coated paraffin as a carrier, and organic reactive dye molecules are fixed on the surface of the carrier; the phase change microcapsule with the paraffin coated with the silicon dioxide is of a core-shell structure, the paraffin serves as a microcapsule core, and the outer surface of the paraffin is coated with the silicon dioxide serving as a shell layer. The excellent ultraviolet absorption capacity of silicon dioxide and reactive dye molecules is utilized, the ultraviolet absorption capacity of a microcapsule sample is remarkably increased, the ultraviolet-proof capacity of the coating can be improved when the microcapsule is added into the interior wall coating, and due to the fact that the heat conductivity of the microcapsule is improved through a silicon dioxide inorganic shell, temperature adjustment of the coating is quicker.

The invention relates to a sized phase change heat storage material applied in the medium and low temperature field.The prepared sized phase change material is characterized by being prepared by compositing, by mass, 80%-85% of a rare earth oxide-modified solid-solid phase change material and 15%-20% of a heat conduction reinforcing phase; the rare earth oxide-modified solid-solid phase change material is heated in a closable container to be in a molten state, the heat conduction reinforcing phase is put into the container, adsorption is performed in a vacuum environment under the pressure smaller than 10<2> Pa to enable the liquid to be fully immersed into the heat conduction reinforcing phase, the container is cooled to room temperature, a sample in the container is taken out, and then the sized phase change material is obtained; the rare earth oxide-modified solid-solid phase change material is prepared from, by mass, 90%-95% of a solid-solid phase change material and 5%-10% of rare earth oxide.The prepared sized phase change material is good in heat stability, high in heat conductivity and simple in preparation method.

The invention relates to a phase-change material, and especially relates to an inorganic phase-change constant-temperature material and a preparation method thereof. The inorganic phase-change constant-temperature material comprises calcium chloride hexahydrate, strontium chloride hexahydrate, sodium chloride, acrylic acid, glycerol, hydroxyethyl methacrylate, maleic anhydride, sodium carboxymethyl cellulose, boric acid and expanded graphite, wherein the total amount of the boric acid and the expanded graphite is 2-12% of the total amount of the inorganic phase-change constant-temperature material; and a mass ratio of the boric acid to the expanded graphite is (1-6):(1-6). The phase-change temperature of the inorganic phase-change constant-temperature material is 26 DEG C, the supercoolingdegree is 0.3 DEG C, the phase-change latent heat is not lower than 236 KJ/Kg, the phase-change process is reversible, and the material can be recycled for not lower than 10000 times; and in addition, the situation of thermal physical property degradation does not exist in the circulation process, and leakage from a base body is not prone to happening.

The invention discloses high-thermal-conductivity nitrate fused salt which is mainly composed of monocrystalline silicon and nitrate fused salt, and the mass percentage content of the monocrystalline silicon is 5-45%. The invention further discloses a preparation method of the high-thermal-conductivity nitrate fused salt and a method for improving the thermal conductivity of the fused salt; monocrystalline silicon is added into the nitrate fused salt, and the thermal conductivity of the nitrate fused salt can be improved; monocrystalline silicon waste generated in the monocrystalline silicon cutting process can be recycled, and the heat conduction capability of the nitrate fused salt can also be improved.

The present invention relates to a high-heat-delivery device suitable for use in an hair straightener, a hair curling iron or an ironing apparatus and suitable for heat transfer to a substrate by direct contact with said substrate, comprising at least one element (A) having a heat transfer contact surface area and at least one element (B) having a heat transfer contact surface, wherein the element (A) comprises a thermoconductive thermoplastic polymer composition comprising at least one polymer and a thermoconductive additive and wherein element (B) comprises a thermoplastic polymer composition comprising a polymer and at least one thermo-releasable substance. Further, the present invention relates to a method for releasing a thermo-releasable substance. Furthermore, the present invention relates to an ironing apparatus, a hair straightener and a hair curling iron comprising the high-heat delivery device.