12results about How to "High phase change enthalpy" patented technology

The invention relates to a composite phase-change film based on liquid metal and PBO fiber and a preparation method thereof, and belongs to the technical field of phase-change material preparation, and the preparation method comprises the following steps: the composite phase-change film comprises a poly (p-phenylbenzobisoxazole) fiber (PBO) base material, a phase-change material and a heat-conducting filler, the phase-change material is composed of phase-change microcapsules (PM) which are prepared by taking polyurethane (PU) as a wall material and organic solid-liquid phase-change materials (OPCMs) as a core material through a Pickering emulsion polymerization method. The prepared PM has a core-shell structure, and leakage of OPCMs is effectively prevented. The PM and the PBO fiber network are combined, so that the dual packaging of the OPCMs is realized, and the leakage of the OPCMs is further prevented. Meanwhile, dispersion and interaction of the OPCMs in a PBO matrix are optimized, and formation of a network structure with a limited domain is promoted. The composite phase change film prepared by the invention has relatively high mechanical properties, remarkable heat conductivity, excellent and stable flexibility and excellent heat storage capacity.

The invention belongs to the technical field of battery safety, and particularly relates to a phase change heat insulation baffle, a preparation method and application thereof, and a soft package battery module. The invention provides a phase-change heat-insulation barrier plate. The phase-change heat-insulation barrier plate comprises a phase-change heat-insulation material and a packaging film for packaging the phase-change heat-insulation material, the phase-change thermal insulation material comprises a substrate material, and a phase-change material and a flame-retardant material which are adsorbed on the substrate material, the substrate material comprises a silicon dioxide nanofiber felt and a supporting material; the phase-change material comprises one or more of silica sol, alumina sol and a saturated calcium chloride solution, and the flame-retardant material comprises a phosphorus-containing flame retardant. The phase-change thermal insulation material contains the phase-change material and the thermal insulation substrate, has a very high phase-change enthalpy value, plays a good role in blocking heat spreading through thermal insulation of the thermal insulation material and phase-change energy consumption of the phase-change material during thermal runaway, and can delay the heat spreading time or inhibit the heat spreading.

The invention discloses a low-thermal-conductivity phase change aerogel material as well as a preparation method and application thereof. The phase change enthalpy value of the material is 50J / g to 110J / g; the phase change temperature is 0-60 DEG C; and the heat conductivity coefficient is 0.08 W / (m.K)-0.1 W / (m.K). The novel low-thermal-conductivity phase-change material is generated by curing polydimethylsiloxane (PDMS) and the phase-change microcapsules. The phase change aerogel material is simple in synthesis process, relatively high in phase change enthalpy value and good in phase change cycle stability. The method has important application prospects in the two aspects of heat energy collection and heat insulation temperature control.

This invention relates to a method for preparing a core-shell structured Al-Zn@Al2O3 composite phase change thermal storage material, belonging to the technical field of medium- and high-temperature phase change thermal storage materials. This invention involves adding an aluminum powder suspension to an HCl solution and stirring at 45–65°C for 5–10 minutes. Gelatin is then added, and the mixture is reacted at 45–65°C with stirring for 10–20 minutes to obtain solution A. NH4F solution is slowly added to solution A at 40–60°C with stirring, and the reaction continues for 30–60 minutes. A mixture of zinc sulfate solution and ethylenediaminetetraacetic acid is then added, and the mixture is reacted for 3–5 hours. After standing, the solid and liquid are separated. The solid is washed 3–5 times alternately with anhydrous ethanol-water-anhydrous ethanol and dried to obtain solid B. Under a protective atmosphere, solid B is uniformly heated to 600–660°C and calcined at high temperature for 2–4 hours to obtain aluminum-zinc alloy powder. Under an air atmosphere, the aluminum-zinc alloy powder is uniformly heated to ~800°C and calcined at high temperature for 1–4 hours to obtain a core-shell structured Al-Zn@Al2O3 high-temperature phase change heat storage material.

The utility model discloses a phase-change material packaging structure, which is characterized in that a core material is used as a supporting carrier of a phase-change material, and a large amount of energy generated during thermal runaway of a battery is absorbed by the phase-change material in a phase-change process, so that heat spreading is avoided; the core material absorbing the phase change material is wrapped in the packaging film, and the heat sealing area on the periphery of the packaging film is bent after being subjected to hot pressing, so that the space occupied by the heat sealing area is reduced, the volume utilization rate of the packaging structure is improved, and the volume and the phase change enthalpy value of the phase change material can be increased in the space with the same size; and secondly, the packaging structure of the phase change material is simple, and compared with a packaging plate, no complex plate or grid structure exists, so that the cost and the weight of the part are reduced.

The application relates to a preparation method of a graphene composite phase change thermal interface material. An oxidized graphene dispersion liquid is provided, a centrifugal roller coating and a layer-by-layer drying process are adopted to form a multilayer oxidized graphene unit layer on a substrate, and an oxidized graphene film is obtained; the oxidized graphene film is placed in a limited space, gradient heat reduction treatment is carried out, the film is controllably expanded in the out-of-plane direction, and a reduced graphene oxide film with a micro-nano cavity structure is formed; the reduced graphene oxide film is subjected to graphitization treatment, and a graphene micro-nano cavity film is obtained; through a vacuum impregnation method, a molten phase change material is filled into the micro-nano cavity structure of the graphene micro-nano cavity film. The thermal interface material has high phase change enthalpy (196.2 J / g), excellent thermal performance (in-plane thermal conductivity 65.5 W.m ‑1 ·K ‑1 , out-of-plane 21.9 W.m ‑1 ·K ‑1 , and low interface thermal resistance (0.575 K.cm 2 ·W ‑1 ).

The invention relates to the technical field of energy storage, in particular to a phase change energy storage box. The phase change energy storage box comprises a box body, the box body is filled with a composite phase change material, a heat exchange pipe is embedded in the composite phase change material, and an inlet and an outlet of the heat exchange pipe extend out of the box body; the composite phase change material is a micron-sized graphite microsphere composite phase change material. By utilizing the characteristics of the micron-sized graphite microspheres, the micron-sized graphite microspheres are compounded with the phase-change material, so that the problem that the phase-change material is melted and leaked in the phase-change process is solved, the heat conductivity of the heat storage material is improved, and heat can be transferred from the heat exchange tube and the composite phase-change material timely and efficiently.

The present invention belongs to the technical field of phase change materials. The present invention discloses a flexible high thermal conductivity composite phase change film, wherein the composite phase change film disperses aramid fibers in an organic solvent to obtain a highly dispersed aramid nanofiber solution, then adds a carbon nanotube solution and stirs and disperses, obtains a carbon nanotube / aramid nanofiber porous film by scraper coating and freeze drying, and then obtains a paraffin / carbon nanotube / aramid fiber composite phase change film by immersing in paraffin and vacuum drying. The preparation method of the present invention is simple to operate and has low cost. The film has the advantages of good flexibility, high phase change enthalpy, high thermal conductivity, high mechanical strength, low leakage rate, etc. It can be used as the shell of electronic products such as mobile phones to ensure the constant temperature operation of lithium batteries and improve the safety and service life of lithium batteries.

The invention relates to a phase-change ice and snow melting steel slag aggregate, an asphalt mixture and a preparation method of the phase-change ice and snow melting steel slag aggregate. The phase change ice and snow melting steel slag aggregate provided by the invention is prepared from the following raw materials in parts by weight: 90 to 110 parts of eutectic phase change material, 190 to 210 parts of steel slag, 90 to 110 parts of modifier, 290 to 310 parts of styrene-acrylic emulsion, 180 to 200 parts of cement and 8 to 12 parts of silica fume. According to the preparation method provided by the invention, the modified steel slag adsorbed with the phase-change material is secondarily packaged by adopting the styrene-acrylic emulsion and the modified cement slurry, so that the problem that the steel slag aggregate containing the phase-change material and the asphalt mixture thereof are easy to leak in the use process is effectively solved. Through the synergistic effect of all the raw material components, the asphalt mixture can be endowed with excellent temperature adjusting and ice melting functions, and active melting of ice and snow on an asphalt pavement in winter is achieved. Meanwhile, the invention provides a way for high-value utilization of the steel slag, the problem that the stacking amount of the waste steel slag is large is effectively relieved, and good economic benefits are achieved.

The invention relates to a low-supercooling-degree settable composite phase change material and a preparation method and application thereof in a heat energy storage technology. The invention belongs to the field of phase change energy storage materials. The problems that the sugar alcohol phase change material is in an amorphous liquid state during melting, the crystallization temperature is low and the degree of supercooling is high are solved. The low-supercooling-degree settable composite phase change material disclosed by the invention is prepared from expanded graphite, erythritol powder and mannitol powder according to a reasonable ratio. The prepared composite phase change material improves the crystallization temperature, reduces the degree of supercooling, is good in shaping state after a high-temperature test, is simple in preparation process, convenient to operate, short in preparation period, simple and harmless in preparation process, and beneficial to industrial production, and the raw materials are safe, non-toxic and low in price. And the method has remarkable social benefits and economic benefits.

This invention discloses a phase change material, its preparation method, and its applications, relating to the field of phase change energy storage materials technology. The preparation method of the phase change material of this invention includes the following steps: S1. Adding a crosslinking agent, an initiator, h-MWCNTs, and water to polyethylene glycol to obtain a mixed liquid; S2. Performing a crosslinking reaction on the mixed liquid and drying it to obtain the phase change material. This invention incorporates h-MWCNTs (hydroxylated carbon nanotubes) while simultaneously causing crosslinking of the polyethylene glycol molecular chains. h-MWCNTs can induce uniform orientation of the polyethylene glycol molecular chains, thus increasing the phase change enthalpy and thermal conductivity of the phase change material.

The invention belongs to the technical field of phase change materials, and discloses a sodium hydroxide hydrate phase change material and a preparation method thereof. The phase change material comprises the following raw materials in parts by mass: 35-50 parts of sodium hydroxide, 0.5-3 parts of a crystallization nucleating agent or a crystallization nucleating agent precursor and 50-65 parts of water, the crystallization nucleating agent comprises at least one of ferrous hydroxide, cobalt hydroxide, manganese hydroxide, chromium hydroxide and strontium hydroxide; the crystal nucleating agent precursor comprises at least one of ferrite, cobalt salt, manganese salt, chromium salt and strontium salt. According to the preparation method, ferrous salt, cobalt salt, manganese salt, chromium salt, strontium salt and other inorganic salts are used as crystallization nucleating agent precursors and can react with sodium hydroxide to generate hydroxides, ferrous hydroxide and other hydroxides have a good crystallization nucleating effect on sodium hydroxide hydrate, and the prepared phase change material has the advantages that the freeze-thaw cycle stability (gt; the phase change enthalpy is high (180J / g); and the method is environment-friendly and non-toxic.