831 results about "Composite phase change material" patented technology

The invention relates to a preparation method of a metal organic framework based composite phase-change material. The method comprises the steps that a metal organic framework material substrate is prepared selectively; hole diameter size design and hole channel polarity regulation and control are performed on the substrate according to the size and the kind of a core material, so that a phase-change core material to be loaded is matched better; the soluble phase-change core material is prepared into a solution; a metal organic framework material is dispersed in the prepared phase-change material solution; a phase-change material is adsorbed by utilizing an extra-large specific surface area and a nano hole channel structure of the metal organic framework material; drying is performed; and then the metal organic framework composite phase-change material with a shaping effect is obtained. According to the method, a novel metal organic framework based composite phase-change material is developed; the prepared metal organic framework based composite phase-change material can effectively avoid leakage and the like, and has the advantages of adjustable nano hole structure and wide core material selection range; the method is simple in technology and mild in reaction condition, and is suitable for scale production; and a raw material is cheap and easy to obtain.

The invention discloses a composite phase change material for heat dissipation of a lithium battery and a device. The device comprises a top cap 1, a box body 2 and partition plates 4; and cavities of corresponding number are partitioned in the box body 2 according to the number of single batteries 3 to be radiated, an air runner 5 is formed between the adjacent partition plates, and the composite phase change material 4 with phase change temperature of between 40 and 70 DEG C is filled in the cavities. When the device starts working, the heat of the single batteries is transferred to the composite phase change material; and when the temperature is higher than the phase change temperature of the phase change material, the phase change material absorbs the heat, produces phase change and stores the heat so as to realize heat dissipation and cooling of the single batteries. The composite phase change material has high coefficient of heat conductivity, keeps the size in the phase change process, has high heat storage, heat release and heat dissipation rate, has no liquid liquidity or leakage, is easily encapsulated, is convenient to operate and maintain, and can improve the working performance and the reliability of the batteries when used for the heat dissipation of the high-power and quick charge/discharge power lithium batteries.

The invention relates to an inorganic hydrated salt expanded graphite composite phase-changing heat storage material. In the preparation method thereof, 85-89 mass parts of inorganic hydrated salt sodium acetate trihydrate as a heat storage matrix, 5.5-6.5 mass parts of disodium hydrogenphosphate as a nucleating agent, 2.5-3.5 mass parts of carboxymethyl cellulose as a thickening agent, and 3-4.5 mass parts of expanded graphite is blended in an inorganic hydrated salt mixture as a material with a high thermal conductivity. Due to the use of the expanded graphite, the material not only maintains excellent properties of natural flake graphite such as good thermal conductivity, no toxicity and the like, but also has adsorbability which the natural flake graphite does not have. The invention solves the problems of sub-cooling degree, phase stratification and low thermal conductivity during the heat storage process. The composite phase-changing material has a low sub-cooling degree after the phase changing performance is improved, the solution thereof is uniform without sedimentation and stratification during the solid-liquid phase change, the performance is stable, the repeatability of good, and the phase-changing heat storage can be enhanced through improving the thermal conductivity of the material.

The invention provides a method for preparing a multilevel porous carbon base composite phase change material, and belongs to the field of composite phase change materials. The method comprises the following steps: at first, preparing an organic metal skeleton material by using such methods as a solution method, a solvothermal method or a stirring synthesis method; with the organic metal skeleton material as a template, high temperature carbonizing under the protection of an inert gas, and changing the carbonizing temperature and the post treatment manner to obtain a multilevel porous carbon material with a super-large specific surface area and a super-large pore volume; selecting proper solvents according to different kinds of phase change core materials, preparing the phase change core materials to a solution, dispersing the porous carbon material into the solution, removing the solvent by such manners as heating, and meanwhile the phase change core materials are adsorbed and limited in the porous carbon material. The composite phase change material prepared by the method provided by the invention has good thermal storage property, can effectively avoid the leakage problem of the phase change core material, and has the advantages of excellent heat transfer property, good cycling stability and wide application range, and the process is simple and is suitable for large-scale production.

The invention relates to a phase transition temperature adjusting cup, which comprises a cup body outer casing, a cup body inner casing and a top cover, and the composite phase transition material is filled between the inner casing and the outer casing. The composite phase transition material comprises phase transition material, a nucleating agent, heat conduction filling material and a thickening agent. The phase transition material is selected from one or more of sodium acetate trihydrate, sodium thiosulfate pentahydrate, twelve disodium hydrogen phosphate, sodium sulfate decahydrate and decahydrate. <{EN4}>The nucleating agent is selected from one or more of borax, sodium phosphate dibasic anhydrous, diatomaceous earth, silica, sodium silicate, eight water strontium hydroxide, hexahydrate chloride strontium. <{EN5}>The heat conduction filling material is selected from one or more of graphite, carbon nanotube, expanded graphite, carbon fiber, graphene, three-dimensional graphite foam, silicon carbide, copper powder. <{EN6}>The thickening agent is selected from one of polyacrylic acid emulsion or carboxymethylcellulose sodium. <{EN7}>Compared with existing temperature adjusting cups, the phase transition temperature adjusting cup of the present invention has the advantages of rapid cooling, simple structure convenient operation, 3-4 hours of comfort temperature zone, and not being restricted from external environment.

The invention relates to a method for preparing an organic and inorganic composite phase-transition material. The method comprises the following steps: firstly, inorganic porous minerals are added into a reaction kettle; and secondly, the reaction kettle is vacuumized and injected with an organic material and then pumped into the state of negative pressure, and the temperature and the stirring speed are required to be adequately controlled during the reaction process. The method takes the inorganic porous mineral materials as a carrier for vacsorb of organic phase-transition materials which accord with the phase-transition requirements; the composite phase-transition material product prepared has the characteristics of no leakage, inflaming retarding, high phase-transition potential, easily controllable phase-transition temperature and so on; and the preparation method has a simple technology and low cost, has no secondary pollution, and is suitable for flow production and industrial production.

The invention discloses an organic/inorganic composite phase-changing material capable of controlling the smoke temperature of a cigarette filter as well as a preparation method and an application of the organic/inorganic composite phase-changing material. The composite phase-changing material is formed by loading alkane of C19 to C21 onto expansive graphite or porous silicon oxide particles. The preparation method comprises the steps of heating the alkane of C19 to C21 for melting, adding expansive graphite and/or porous silica gel particles, adequately stirring the alkane and the expansive graphite and/or the porous silica gel particles to obtain a mixture, and cooling and crystallizing the mixture under the condition that the temperature is not more than 25 DEG C to obtain the organic/inorganic composite phase-changing material. In the preparation method, raw materials are easy to obtain, the method is simple to operate and low in cost; the prepared composite phase-changing material is high in phase-changing latent heat and high in heat transfer performance. When the prepared composite phase-changing material is added to a cigarette filter stick, the temperature of mainstream smoke of a cigarette can be effectively reduced; moreover, the prepared composite phase-changing material has characteristics of little addition amount and obvious cooling effect.

The invention discloses a mesoporous material-based composite phase change heat storage material and a preparation method thereof. The composite phase change heat storage material, which can still keep fixed shape even at the temperature higher than the melting point of phase change substance by 30 DEG C, is prepared by using mesoporous material as carrier matrix and organic substance as phase change substance according to methods of physical blending and impregnation. Compared with other technologies, reported in documents, for the preparation of shape-fixed composite phase change material, the preparation technology has the characteristics of great simplicity and saving time, and the prepared composite phase change heat storage material has high content of the phase change material, high latent heat of phase change and utilization rate of the latent heat, and obviously lowered phase change temperature.

The invention provides a nano composite phase change material and a method for preparing the same, and belongs to the field of material application. The nano composite phase change material comprises the following components in weight portion: 10 to 15 portions of phase change material, 5 to 60 portions of layer-shaped silicate powder, and 20 to 70 portions of deionized water; the phase change point of the phase change material is between 20 and 80 DEG C; the phase change material is heated up to be completely melted; the layer-shaped silicate powder is dispersed in water by a high shear mixed emulsion machine to prepare layer-shaped silicate gel state aqueous dispersion; and the melted phase change material is added to the layer-shaped silicate gel state aqueous dispersion and stirred at high speed by the high shear mixed emulsion machine to obtain the nano composite phase change material with oil-in-water structure. The nano composite phase change material can be directly added to building base materials such as concrete, gypsum, thereby greatly reducing process complexity and preparation cost; moreover, the composite phase change material also has the advantages of simple preparation, large heat storage, and better application prospect.

The invention discloses a device and a method for measuring phase change latent heat of a composite phase change energy storage material, and belongs to the technical field of test of building materials. Obvious shortcomings of small using amount of samples, large error, low representativeness and the like exist in the conventional method for measuring the thermal performance of a composite phase change material. The invention discloses a device for measuring the phase change latent heat of the composite phase change energy storage material and provides a corresponding measurement method. The invention is characterized in that a large quantity of phase change materials are heated by disk-type resistance wires under the condition that the heat of a constant-temperature water bath is preserved; and a curve of the temperature changed along with the time is measured by a plurality of groups of thermocouples and subjected to regression analysis, so that the thermal performance of the composite phase change material can be reflected really. The device and the method have great significance for popularization and application of the composite phase change material, particularly for building energy conservation.

The invention discloses an energy-storing building wall structure containing a double-layer phase-change material plate. The building wall structure includes an exterior finishing plate, an exterior heat-insulation plate, an exterior shaping phase-change material plate, a wall layer, an interior shaping phase-change material plate, an interior heat-insulation plate and an interior finishing plate in sequence from exterior to interior, wherein the finishing plates, the heat-insulation plates and the shaping phase-change material plates are combined together to form a novel finishing heat-insulation plate, the exterior and interior shaping phase-change material plates are composed of a novel inorganic composite phase-change material and an encapsulating material thereof, and a high-temperature-resistant fire-prevention material is attached to the surface of the encapsulating material. According to the energy-storing building wall structure containing the double-layer phase-change material plate, the two materials with different phase-change temperatures are combined with a wall, not only are production and installation convenient and fast, but also the effect of heat insulation is good, the application range is wide, the energy-storing effect of the phase-change material is exerted in different seasons, the living comfort level of indoor environment can be effectively improved, and building energy consumption is reduced.

The invention discloses a power battery thermal management system with functions of efficient heat dissipation and efficient heating. The power battery thermal management system comprises a power battery case and a thermal management system, wherein a plurality of battery monomers are adjacently aligned to form a battery pack placed inside a battery case housing, a composite phase change material plate is sandwiched between the gap of the adjacent batteries and the surface of the outermost side battery in the battery pack width direction, the composite phase change material plates and thermal pipes are combined to form composite phase change material thermal pipe coupling components, the composite phase change material thermal pipe coupling components are additionally arranged on both sides of the battery pack, the thermal pipes extends from the through holes on the battery module housing, the extending ends are connected to heating devices and heat dissipation fans, and a programmable automatic temperature regulator treats the signal from a temperature sensor by programming so as to determine whether the fans and the heating devices are started. The power battery thermal management system of the present invention has advantages of simple and firm whole structure, high efficiency, stable operating, and the like. In addition, the battery pack can be subjected to direct, unified and uniform cooling and heating, such that the battery can work at the appropriate temperature range, and the electric vehicle battery thermal management system is improved.

The invention discloses a phase-change energy-storage building insulation structure. A wall structure is successively provided with a wall substrate, an insulation layer, a directional structural plate, a fixed-form phase-change energy-storage insulation board and an exterior board in the direction from outdoor to indoor, and the fixed-form phase-change energy-storage insulation board comprises an inorganic composite phase change material and a packaging plate; the inorganic composite phase change material is composited from inorganic hydrated salt and a porous structure carrier, and the phase transition temperature of the phase change material is 10-40 DEG C; in inorganic composite phase change material, the weight percentage content of the inorganic hydrated salt is 40-95%, and the inorganic composite phase change material is coated with light-cured resin with fire resistance and corrosion resistance. The phase-change energy-storage building insulation structure has the good effects of heat preservation and thermal insulation, and can store cold quantity in outdoor air at summer night in the phase-change energy-storage insulation board; in the daytime, the stored cold quantity is released into indoor air so as to prolong the time of an indoor peak temperature, reduce the fluctuation of the indoor temperature, improve the environmental comfort and reduce the energy consumption of an air conditioner in summer.

The invention discloses a preparation method of a nano particle-doped phase change microcapsule. The preparation method comprises following steps: a nano material is subjected to surface treatment, and then is added into a core material after surface treatment so as to obtain a composite nano core material emulsion; a prepared prepolymer capsule wall material is added into the nano core material emulsion so as to obtain a capsule suspension liquid loaded with the nano material; and the capsule suspension liquid is subjected to filtering, washing, drying, and grinding so as to obtain nano particle-doped phase change microcapsule powder. According to the preparation method, the functional nano material is subjected to pretreatment, and then is doped into a shell material or the core material of the microcapsule, so that synergistic effects with a phase change material in the microcapsule are achieved; and loading amount of the nano particle on different parts of the microcapsule is controlled by controlling surface energy of the nano material, and further more nano composite phase change material microcapsules with a plurality of functions (heat functions, optical functions, magnetic functions, and electric function) are prepared.

The invention relates to a preparation method of the phase change material, in particular to a preparation method of the compound phase change material which has a higher latent heat of phase change and a high thermal conductivity under the solid and the liquid states. The preparation steps are as follows: firstly, metal nanowires are prepared; secondly, the metal nanowires are dispersed into an organic solvent; thirdly, an organic phase change material and the mixture are mixed; fourthly, the mixture is dispersed by ultrasonic under the condition of heating, and the organic solvent is removed. The phase change material prepared by the method has the advantages that the art is simple, the cost is low, and the thermal conductivity of the organic phase change material is enhanced greatly while the latent heat of phase change is maintained, thus the performance of the organic phase change material is improved effectively, and the application scope is greatly developed.

A phase-changing material in the form of micro capsule is prepared from the phase-changing material (paraffin wax) and basic supporting material (polystyrene and polyethene) through heating for fusing, mixing for coating, and microcapsule packing by in-situ polymerizing by melamine modified urea-aldehyde resin. It has adjustable phase-changing temp (0-70 deg.C) and high phase-changing enthalpy (138 KJ/kg).

The invention discloses a water cooling and composite phase change material combined power battery heat dissipating device which comprises a box body and a base plate arranged at the bottom of the box body, wherein a water inflow channel and a water outflow channel which are used for accommodating cooling water are respectively arranged inside the base plate and along two long edges, aperture passages communicated with the water inflow channel and the water outflow channel respectively are arranged on the upper surface of the base plate and along the two long edges, tabular micro-channel heat exchangers are arranged on the base plate at certain intervals in the length direction, micropore flow passages are arranged inside the tabular micro-channel heat exchangers, the two end ports of each micropore flow passage are respectively connected with an aperture passage I communicated with the water inflow channel and an aperture passage II communicated with the water outflow channel, and spaces formed by the tabular micro-channel heat exchangers, the base plate and the box body are filled with a composite phase change material. The water cooling and composite phase change material combined power battery heat dissipating device provided by the invention has the advantages of high heat accumulation and heat dissipation rates, convenience in operation and maintenance, low cost and the like, can be used for heat dissipation of high-power and quick charge-discharge power batteries, and can improve the working performance and the reliability of batteries.

The invention discloses a preparation method of polyethylene glycol and epoxy resin shaping composite phase change material. The invention includes the following steps of (1) adding polyethylene glycol and epoxy resin into a reaction container, adding the mixture liquid of firming agent and accelerant after polyethylene glycol is completely dissolved and is dispersed evenly with the epoxy resin; (2) defoaming the mixture obtained from step (1) in vaccum, pouring the mixture into a die applied with parting agent, transferring the die into an oven for solidification and moulding for 24-48 hours, then cooling the die until demoulding. The materials proportions are that epoxy resin condensate is 10 to 50 percent, polyethyleneglycol is 50 to 90 percent; the contents of the firming agent and the accelerant respectively account for 8 to 40 percent and 1 to10 percent of the epoxy resin. The composite phase change material of the invention not only has large potential heat and excellent energy accumulating effect, but also has good figuration performance and high stability.

The invention discloses a composite phase-changing material and making method, which comprises the following steps: 1) blending carbowax with molecular weight at 2000-10000 and anhydrous alcohol with weight rate at 0. 21-0. 34; heating to stir; forming the composite liquid; 2) dripping p-ethyl-siliconic acid with weight rate at 0. 61-0. 87 corresponding to carbowax at 0. 61-0. 87 into the composite solution in the step 1); stirring; adding water with molar weight at 2:1-6:1 corresponding to p-ethyl-siliconic acid; adjusting pH value of solution at 0. 5-2; stirring under normal temperature; 3) aging the sol in the step 2) for 24h under 40 deg. c; forming the gel; drying under high temperature to obtain the carbowax/silica composite phase-changing material. The invention stablizes the shape and good heat stability, which forms even composite phase-changing material.

The present invention discloses nano thermal conductivity enhanced microcapsule composite phase change material and a preparation method thereof, nano thermal conductivity enhancing material is high thermal conductivity nanoparticles such as boron nitride (BN), carbon nanotubes (CNTs) or graphene oxide (GO), and a microcapsule core material is organic phase change material. The phase change material, an emulsifier and a solvent are mixed and prepared according the preparation method of the invention to obtain thermal conductivity enhanced microcapsule composite phase change material based on nanoparticles such as BN, CNTs and GO, wherein all the added BN, CNTs and GO are modified to comprise hydroxyl groups. In addition, it is possible to add the nano thermal conductivity enhancing particles such as BN, CTNs or GR into the core material of the microcapsule core material according to actual needs. The composite phase change material prepared herein has high phase change enthalpy, good thermal cycle stability, excellent thermal conductivity and the like, has a simple preparation process, stable structure and high encapsulation rate and is widely applicable.

The present invention features that the material has crosslinked crystalline polyolefin as base body and crystalline alkyl hydrocarbon dispersed inside the crosslinked net as the composite material for phase change energy accumulation. In the composite material, the phase change energy accumulating component accounting for 40-80 % has solid-solid phase conversion at phase change temperature of 20-80 deg.c and phase change enthalpy greater than 80 J/g. The composite phase change material has relatively high energy accumulating density and excellent heat stability, may be used as energy accumulating material for the accumulation of solar energy and industrial afterheat, constant temperature in building and energy saving in air conditioner and as temperature control material in electronic instrument, machinery, etc. widely.

The invention discloses a preparation method of a paraffin/polyurethane solid-solid composite double-phase change energy storage material, comprising the following steps: selecting raw materials which comprises the following components: by weight, 40-90 parts of polyethylene glycol, 4-20 parts of isocyanate, 0-10 parts of a chain extender, 0-50 parts of paraffin, 0-5 parts of a surfactant and 0-1 part of a catalyst; melting glycol and carrying out vacuum-pumping processing, mixing the molten glycol with the surfactant and paraffin, adding isocyanate, the chain extender and the catalyst to react at a temperature of 60-90 DEG C to obtain a performed polymer, carrying out deaeration on the performed polymer, injecting the deaerated performed polymer into a mould, solidifying, cooling and demoulding. According to the composite double-phase change energy storage material provided by the invention, a paraffin hydrocarbon compound with large latent heat of phase change is used as a filling material, and a polyurethane material with a phase change function is used as a matrix. Latent heat of phase change of the prepared paraffin/polyurethane solid-solid composite double-phase change energy storage material reaches 154J/g, phase-change temperature ranges from 15 DEG C to 70 DEG C, and the material is a composite phase change material having a double-phase change character.

The invention relates to a foam metal composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change energy storage materials. A crystallized hydrated salt-foam metal composite phase-change energy storage material is prepared by adopting the adsorption characteristic of a porous foam metal skeleton structure, and a vacuum argon filling state is kept in a preparation process, so that impurities are prevented from entering, and the quality of a product is ensured. The phase-change material is relatively uniformly and sufficiently distributed in a substrate of the foam metal skeleton material, and the shaping characteristic of the composite material is maintained under the combined action of a capillary force and surface tension of foam metal, so that the phase-change material does not leak easily in a phase-change process, and the preparation method of the phase-change material is simple and convenient, high in recombination rate and good in operability. The composite phase-change material has the advantages of high phase-change latent heat in unit volume, high heat storage and release rates, good heat-conducting property, lower supercooling degree, and the like; and the lower heat conductivity and supercooling problems existing after the crystallized hydrated salt phase-change material is applied for a long time are solved effectively.

The invention belongs to the technical of bituminous pavement maintenance materials, and particularly relates top a cold mixing bituminous concrete and a preparation method thereof. The self temperature adjustment cold mixing bituminous concrete is characterized by being prepared from the following raw mateirals in percentage by weight: 70-80 percent for the aggregate, 1-3 percent for the filler, 5-10 percent for the composite phase change material, 8-10 percent for water and 6-8 percent for the modified emulsified asphalt. The composite phase change material is made of wax and expanded graphite composited together, the mass ratio of the expanded graphite and the wax is 1:8-9, the phase change temperature of the composite phase change material is 40-50 DEG C, and the phase change heat is 150-160kJ/kg. The process is simple, the cost is low and implementation is easy. The concrete has the function of reducing pavement temperature.