58 results about "Phase change enthalpy" patented technology

The invention discloses an antistatic polyester film capable of phase change temperature regulation and a preparation method thereof, the film provided by the invention has a double-layer structure, the bottom layer is a temperature regulation functional layer doped with a phase change material, and the surface layer is a functional layer doped with carbon black to prevent electrostatic aggregation. According to the antistatic polyester film capable of adjusting the temperature through phase change, the adjusting temperature is 27 DEG C, the phase change enthalpy is 17 j / g, the surface resistivity of the surface layer is 1.1 * 10 < 7 > omega / m < 2 >, and the antistatic polyester film is expected to be applied to the fields of intelligent wearable equipment, medical sensors, electronic packaging materials, supercapacitor protection layers and the like.

The invention discloses a thermochromic phase change film with a repairable function, which is characterized in that polyvinyl alcohol PVA and boric acid BA are used as raw materials for crosslinking, thermochromic ink is used as a color change material, polyethylene glycol PEG-8000 is used as a phase change material, and the thermochromic film PBTP-M with the repairable function is prepared by a one-step method based on physical pouring; meanwhile, the material has repairable performance, reversible thermochromism performance and phase change performance; the repairable performance can be quickly recovered to an initial state by adding water and drying; the color change temperature of the reversible thermochromism performance is 50 DEG C; according to the phase change performance, the phase change temperature ranges from 22.67 DEG C to 53.76 DEG C, the phase change enthalpy value ranges from 55.583 J / g to 78.679 J / g, and the heat conductivity coefficient ranges from 0.6827 W / (m.K) to 0.8643 W / (m.K). The preparation method comprises the following steps: mixing PVA, BA, TC and PEG-8000 by adopting a one-step method based on physical pouring, and then carrying out physical pouring.

The invention discloses a multi-element eutectic molten salt eutectic component and melting point rapid prediction method, which comprises the following steps: S1, based on binary phase equilibrium data, using a Wilson model to obtain binary interaction parameters of corresponding components, and constructing a binary system database including binary system melting point, phase change enthalpy, molar ratio, biased Gibbs fusion energy and interaction parameters; and S2, based on the binary interaction parameters obtained in the step S1, calculating the eutectic components and the melting point of the multi-component molten salt by using a thermodynamic principle and a Newton-Raphson method in combination with the thermophysical property data of the single-component molten salt. According to the multi-element eutectic molten salt eutectic component and melting point rapid prediction method, the multi-element molten salt system eutectic component and the phase transition temperature can be calculated through binary molten salt system data, the dual advantages of being high in prediction speed and high in prediction precision are achieved, and the method has great significance in reducing experiment combinations, shortening experiment time and rapidly screening available formulas.

The invention relates to the technical field of fiber reinforced resin-based composite materials, in particular to a two-component sweating type fiber reinforced phenolic aerogel composite material and a preparation method thereof. The method comprises the following steps: (1) modifying phenolic resin; (2) preparing a phenolic resin pregel solution; (3) impregnating the fiber reinforcement; (4) gel curing; (5) drying; (6) filling with an inorganic phase change agent; and (7) filling with an organic phase change agent. The phenolic aerogel is prepared by taking the phenolic resin modified by hot acid treatment as a raw material, so that the curing crosslinking degree of the phenolic resin can be effectively improved, and the skeleton and pore diameter of the aerogel can be refined. According to the invention, the inorganic phase change agent and the organic phase change agent with high phase change enthalpy values are sequentially introduced into pores of the phenolic aerogel, and the hierarchically distributed binary phase change agent can be subjected to solid-liquid-gas phase change in sequence from outside to inside in a high-temperature environment, so that the composite material has comprehensive properties such as ultrahigh temperature resistance, long-term efficient heat insulation and high mechanical strength.

The invention discloses a photo-initiation polymerization phase change microcapsule material as well as a preparation method and application thereof. The method comprises the following steps: mixing a core material and a wall material, and adding a photoinitiator to obtain an oil phase; adding a surfactant into deionized water, and fully stirring to obtain a water phase; slowly pouring the oil phase into the water phase, and homogenizing at a corresponding rotating speed by using a homogenizer to obtain a stable emulsion; and cooling the emulsion to a corresponding temperature, irradiating with an ultraviolet lamp, centrifuging, washing with deionized water, and drying in a drying oven to obtain the phase change microcapsule. The phase change microcapsule disclosed by the invention shows a clear core-shell structure, is in a regular circle shape, and has relatively high phase change enthalpy, relatively high initial thermal weight loss temperature, controllable particle size and negligible leakage rate. When the phase change microcapsule is added into the resin, the composite material shows obvious delayed temperature rise when being heated, and the phase change material has no obvious leakage, so that a good application prospect is provided for being widely applied to thermal forming and thermal management based on high polymer materials.

The invention provides a preparation method of a multifunctional phase change energy storage composite membrane with thermal management performance. The preparation method of the composite membrane comprises the following steps: S1, preparing the phase change microcapsules; s2, preparation of a single layer of MXene; and S3, preparing the composite membrane. The multifunctional composite membrane is constructed by adopting the phase change microcapsules through a vacuum filtration technology. Under the condition of co-adhesion of the MXene two-dimensional nanosheets and the chitosan, the obtained composite membrane has good mechanical strength. The excellent heat management capability is provided for the composite material film and the phase change microcapsule, and the excellent light-heat conversion efficiency performance is provided by a functional structure constructed by the MXene two-dimensional nanosheets. The preparation method has the advantages that the reaction process is simple and easy to control, the production period is short, and the production cost is low, and the prepared phase change composite film can be applied to thermal insulation materials and human body photothermal therapy and has proper phase change temperature, excellent phase change enthalpy and good thermal stability.

The application relates to preparation and application of inorganic eutectic shaped phase change materials with heat preservation function, belonging to the technical field of phase change energy storage. The inorganic eutectic shaped phase change material takes sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate as phase change main body materials, and takes sodium silicate nonahydrate as a nucleating agent, so that the supercooling degree is reduced, and the inorganic eutectic phase change material with low supercooling and no phase separation is prepared. Further, the inorganic eutectic shaped phase change material is prepared by using gaseous SiO2 as supporting material. The material prepared by the application has suitable phase change temperature, higher phase change enthalpy and very low supercooling degree, and has no phase separation phenomenon. Moreover, the synthesis process is simple, and the raw material is low in price. Simulation application test shows that the material has excellent building heat buffering performance, and has wide application prospect in the field of building energy saving.

This invention relates to high-energy-density phase change composite materials, their preparation methods, and applications, belonging to the field of phase change composite material technology. To address the problems of low energy density, insufficient mechanical properties, and poor processability of current phase change materials, this invention provides a high-energy-density phase change composite material, specifically a lightweight porous cellulose phase change composite aerogel. Internally, it consists of a three-dimensional network framework formed by the cross-linking of vinyl-functionalized cellulose nanocrystals and cellulose nanofibers. The phase change material is uniformly loaded within the pores of this three-dimensional network, with a loading amount of 65.53~91.02 wt%. The phase change temperature range of the composite material is 20~80℃. This invention's phase change composite material, relying on a hierarchical confinement structure, achieves efficient encapsulation and high loading of the phase change material, with a phase change enthalpy as high as 133.2 J / g. It also possesses excellent mechanical and thermal cycling stability and 3D printing performance, making it suitable for scenarios with wide temperature fluctuations and applicable to the field of intelligent thermal management.

The present invention belongs to the field related to phase change materials, and specifically relates to a high thermal conductivity and high phase change enthalpy carbon nanocomposite phase change microcapsule and its preparation method. The present invention uses flaky graphene oxide as a dispersant to form a water-in-oil Pickering emulsion with graphene oxide as the interface, and adds an initiator to the aqueous phase to polymerize the aniline monomer and the cross-linking monomer in the oil phase at the interface of the Pickering emulsion to form a network polymer layer to fix the capsule thermal conductive particle shell. The microcapsule shell is composed of thermal conductive polymer cross-linked polyaniline and thermal conductive particle graphene oxide. The diameter of the thermal conductive carbon nanoparticles first dispersed in the alkane phase change material is equivalent to the diameter of the capsule, and a thermal conductive path supporting the skeleton structure is formed in the confined space inside the microcapsule, thereby improving the thermal conductivity of the microcapsule. It has the characteristics of high thermal conductivity and high phase change heat storage capacity, and can be applied to renewable energy storage, new energy vehicle thermal management, industrial waste heat utilization, aerospace engineering and other fields.

The present invention discloses a worm graphite-encapsulated thermally conductive phase change particle interface material with high thermal conductivity and phase change function and a preparation method thereof. The thermally conductive phase change particles include hydrophilically modified worm graphite and an organic phase change material. The thermally conductive phase change particles are mixed with a thermally conductive filler and a liquid polymer, and then cured to obtain a corresponding thermal interface material. The method of the present invention is simple and suitable for large-scale preparation. The obtained material has a dual thermal conductive network inside, which not only has a thermal conductivity far superior to that of a traditional directly mixed sample, but also has a high phase change enthalpy that gives the material a passive temperature regulation capability.

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.

The invention relates to the field of data phase change material informatics, and discloses a phase change refrigeration material performance prediction method and a related device. A shape memory alloy database about phase change refrigeration material components, process conditions, temperature-induced martensite phase change enthalpy change data and adiabatic temperature change is constructed; establishing a component process-adiabatic temperature change generation model by utilizing a database and a machine learning model; obtaining a phase change and enthalpy change data set by using a component process-adiabatic temperature change generation model; dSC curve features in the phase change and enthalpy change data set are extracted, and low-dimensional phase change features are obtained; based on the low-dimensional phase change characteristics, combining with the process parameters, and utilizing an artificial neural network model to construct an elastic-thermal performance prediction model; and under the condition of given DSC data, obtaining corresponding adiabatic temperature change under the condition of given DSC data by using the elastic-thermal performance prediction model. According to the method, the generation model and the prediction model can be combined under the small sample condition, and the elastic-thermal performance of the shape memory alloy is predicted by taking the temperature-induced martensite phase transformation characteristic as a bridge.

The invention discloses a medium-temperature zone phase change material and a preparation method thereof, and the preparation method comprises the following steps: stirring a mixed solution containing stearic acid, zinc salt, triethylamine and ethanol, reacting, centrifuging, and drying to obtain the medium-temperature zone phase change material. The stearic acid reacts with the zinc salt to generate the novel medium-temperature zone phase change material, the phase change temperature is 117.49 DEG C, and the phase change enthalpy value is 184.16 J / g. The phase change 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 temperature control in a medium-temperature area.

This disclosure relates to a composition for preparing phase change composite materials, the phase change composite material itself, a preparation method thereon, and its applications. Based on the total weight of the composition, it comprises: 80-90% by weight of a phase change material, 5-17% by weight of a thermally conductive filler, and 3-15% by weight of a thickener. The phase change composite material has a phase change enthalpy of 80-250 J / g, a phase change enthalpy yield of 80-90%, a thermal conductivity of 1-10 W / m·K, and a melt index of 15-150 g / min. Using the composition of this disclosure to prepare the phase change composite material can improve the phase change enthalpy yield, while also exhibiting high thermal conductivity and a certain degree of plasticity in the molten state. Furthermore, the mixing and molding processes are simplified by using only a heated stirring pan or kneading pan, reducing production costs.

The invention relates to a method for quantitatively designing the functional mix proportion of a phase-change material for SAC. The method comprises the following steps: acquiring a characteristic initial temperature T, a peak temperature T and a characteristic final temperature T of sulphoaluminate cement through an adiabatic temperature rise test; [T, T] is used as a functional targeted phase change interval of the phase change material, and based on the total hydration heat release amount Qcem in the temperature interval and the phase change enthalpy delta Hpcm of the phase change material, the functional mixing amount Mpcm of the phase change material in unit volume of concrete is calculated, then the aggregate dosage is calculated through an absolute volume method, and finally the concrete mix proportion is determined. According to the invention, accurate matching of the phase-change material and sulphoaluminate cement hydration characteristics is realized, and an effective temperature control solution is provided for sulphoaluminate cement concrete construction.

The invention belongs to the field of phase change energy storage temperature control materials of an organic system, and provides a preparation method of a lignin-based organic phase change material, the lignin-based organic phase change material comprises the following raw materials by weight: 86%-97% of erythritol, 2%-5% of hexagonal boron nitride, 0.5%-2% of a lignin compatibilizer and 0.5%-10% of expanded graphite, and the sum of the mass percentages of the raw materials is 100%. By adding the lignin compatibilizer, the compatibility of the phase change material and other components is improved, and the stability of the whole material is improved by regulating and controlling the formula. The energy storage and temperature control phase change material provided by the invention has the advantages of proper phase change temperature, high phase change enthalpy value, low supercooling degree, good cycle stability and no obvious phase separation phenomenon, and is a proper thermal physical energy storage technology.

This invention discloses a gel-based composite phase change energy storage material and its preparation method. The material comprises the following components in the indicated mass fractions: 70%–80% phase change matrix; 5%–10% temperature regulator; 1%–3% nucleating agent; 0.5%–1.5% thermal conductivity enhancer; 10%–15% gel skeleton; and 0.5%–2% thickener. This invention precisely controls the phase change temperature to -25°C to -20°C using the temperature regulator, meeting the requirements for frozen product transportation; it utilizes synergistic nucleating agents and functionalized multi-walled carbon nanotubes to control the supercooling to within 2°C; the carbon aerogel skeleton and surface gel protective layer achieve dual leak prevention, exhibiting excellent cycle stability, with a phase change enthalpy decay rate of less than 5% after 500 cycles; simultaneously, the thermal conductivity is significantly improved, and the raw materials are environmentally friendly and biodegradable, showing broad application prospects in the cold chain logistics field.

The application belongs to the technical field of inorganic functional material preparation, and particularly relates to pure-phase vanadium dioxide powder and a preparation method and application thereof. The application makes the precursor system simultaneously contain pentavalent vanadium species and tetravalent vanadium species through partial reduction treatment, so that the average valence of vanadium gradually approaches the target valence of vanadium in VO2, and meanwhile, reaction space for further reduction, hydrolysis, condensation and crystal growth in a subsequent hydrothermal process is reserved. The partial reduction mode can avoid excessive complexation, rapid nucleation and organic residue caused by excessive citric acid, relieve the reduction and hydrolysis process, and reduce the risk of local excessive reduction and out-of-control oxygen content in a subsequent vacuum annealing process. The obtained VO2(M) powder has obvious heat-induced phase change endothermic and exothermic peaks and high phase change enthalpy, indicating that the crystal phase purity is high and the phase change process is sufficient, and the powder is suitable for the fields of thermochromic, infrared regulation, intelligent window and infrared camouflage.

Disclosed in the present invention are a novel phase change energy module and a preparation method therefor, belonging to the technical field of phase change energy storage materials. The energy module product consists of a shape-stabilized phase change system having thermal energy storage properties and an encapsulating bag. The preparation method comprises: using a support framework material to realize shape stabilization and adsorption of a phase change matrix and an additive, and performing secondary encapsulation with an aluminum foil bag, so as to solve the problem of liquid leakage during long-term recycling. The present invention involves a simple synthesis process, and is convenient to use. The material exhibits no significant liquid leakage during operation, a high phase change enthalpy value and a low price, and therefore has wide application prospects.

The application belongs to the technical field of energy storage, and relates to a composite phase change material and a preparation method and application thereof.The composite phase change material comprises a paraffin base body and a heat-conducting phase change material dispersed in the paraffin base body; the heat-conducting phase change material comprises at least one of biomass-based graphene, copper nanowire foam and Fe3O4 modified biomass-based graphene. Bamboo powder is converted into few-layer graphene through sandwich microwave plasma technology, then is modified by Fe3O4 nanoparticles, is compounded with paraffin, and finally is packaged with copper nanowire foam to construct a synergistic structure of 'two-dimensional heat-conducting network-three-dimensional metal skeleton-nano light absorber'. The prepared composite phase change material has a photo-thermal conversion efficiency of 73.47%, a heat conductivity of 3.157 W·m ‑1 ·K ‑1 , a phase change enthalpy retention rate of >98% and no leakage. The composite phase change material is suitable for solar heat storage, intelligent building and electronic device heat management, and is produced in a green and low-cost manner through biomass waste resource utilization.

The application provides a phase change microcapsule design system and method based on artificial intelligence, which comprises a machine learning module, a data establishing module, a target input module, a machine screening module and a target output module, the machine learning module is used for collecting raw material composition, synthesis process and performance data of existing phase change microcapsules, the data establishing module is used for collecting types of organic materials and inorganic materials and material preparation processes, the target input module is used for inputting phase change temperature, phase change enthalpy value, coating rate and type of core material of the phase change microcapsule to be designed, the machine screening module is used for screening suitable wall materials and emulsifiers from the data establishing module according to machine learning results and data of the target input module, and the target output module is used for outputting the designed phase change microcapsule.

The invention discloses a long-chain ethylenediamine bis-n-alkanoic acid diammonium salt single-crystal phase change material and a preparation method thereof, ethylenediamine is used as an alkaline ligand, long-chain n-alkanoic acid is used as an acidic ligand, and the long-chain n-alkanoic acid is introduced to amino groups at two ends of ethylenediamine through a salt forming reaction to form the long-chain single-crystal phase change material with a sandwich layered structure. The structural formula of the material is [NH3 (CH2) 2NH3] < 2 + >. 2 [RCOO] <->, wherein R represents C11-C15 linear alkyl; the single crystal is regular in structure and belongs to a triclinic system and a P1 space group, and Z is equal to 1. The narrow phase change temperature zone and the phase change enthalpy of the material are averagely improved by more than 30% and can be maximally improved by more than 80% compared with corresponding long-chain n-alkanoic acid, and the material has good thermodynamic properties and is expected to be applied to the fields of industrial waste heat recovery, solar heat storage, aerospace thermal control systems and the like as an efficient phase change energy storage material.

A method for preparing and applying a shaped organic / inorganic composite phase change material (CPCM) is disclosed, belonging to the field of phase change energy storage technology. The CPCM comprises 50-70 wt% inorganic solid-liquid CPCM, 5-30 wt% organic solid-liquid CPCM, 5-15 wt% emulsifier and thickener, and 10-30 wt% porous support material. The inorganic solid-liquid CPCM is a hydrated inorganic salt-based CPCM, the organic solid-liquid CPCM is an organic acid ester or long-chain alkane-based CPCM, and the emulsifier and thickener are ionic cellulose gums. These three components are assembled under supramolecular forces and uniformly composited with the porous adsorbent material. The prepared CPCM exhibits a high phase change enthalpy and good cycling stability. Furthermore, the CPCM demonstrates excellent building thermal management performance, making it highly suitable for large-scale application in future building thermal management.

The invention relates to the technical field of heat management materials, in particular to a solid-solid composite phase change heat storage material and a preparation method thereof.The 1, 10-decanediol is selected as a main phase change material, and the synergistic effect of expanded graphite and flake graphene is combined, so that the high phase change enthalpy is kept, and meanwhile the solid-solid composite phase change heat storage material is obtained; the phase change temperature of the material is adjusted to a more ideal range; the heat storage capacity of the material is improved, the expanded graphite and the flake graphene are introduced, particularly 12-15% of expanded graphite and 2-5% of flake graphene are matched, so that the heat conduction performance of the material is greatly enhanced, the heat absorption and release process is accelerated, and the selected 1, 3-propylene glycol has the advantages that the heat storage capacity of the material is improved; the 1, 10-decanediol, the expanded graphite and the flake graphene are all environment-friendly materials, are non-toxic and harmless, are easy to recycle and process, and accord with the current green and low-carbon development trend, so that the technical problem that a solid-solid phase change heat storage material in the prior art is difficult to meet the requirements of phase change temperature and phase change enthalpy at the same time is solved.

The present application relates to a kind of double-shell high-thermal-conductivity phase change heat storage microcapsules for ultra-deep drilling fluid and its preparation method and application, belong to the drilling fluid chemistry field of petroleum industry.The present application respectively with two high-melting-point phase change materials and two eutectic compounds of phase change material as core material, by twice the coating of outer shell, a kind of double-shell high-thermal-conductivity phase change heat storage microcapsules for ultra-deep drilling fluid is prepared, the material has high phase change temperature, phase change temperature is between 173.3-230.7 DEG C, phase change enthalpy is as high as 211.4J / g, when in phase change temperature range, a large number of heat will be absorbed, play the role of " phase change latent heat", the material is applied to drilling fluid can significantly reduce the temperature of drilling fluid, improve the tolerance of drilling fluid to high temperature formation.

The invention discloses a method for testing the supercooling degree of nano-liter liquid drops by a differential scanning calorimetry. The method comprises the following steps: taking a liquid sample with the mass of more than 0.2 mg or the volume of more than 0.2 mu L, then placing the liquid sample in a crucible to form a plurality of sub-droplets, then carrying out DSC test to obtain the phase change enthalpy of the plurality of sub-droplets, and calculating to obtain the degree of supercooling of the plurality of sub-droplets; wherein the volume of at least one sub-droplet is less than 0.1 mu L. The method provided by the invention can accurately measure the freezing point temperature of the liquid drop below 50 nanoliters and even 5 nanoliters, widens the measurement range of the quantitative relationship between the liquid drop size and the supercooling behavior, and lays a technical foundation for researching the liquid coating dominated liquid drop phase change behavior.

The invention belongs to the technical field of energy storage, and relates to a composite phase change material and a preparation method and application thereof. The composite phase-change material comprises a paraffin base body and a heat-conducting phase-change material dispersed in the paraffin base body. The heat-conducting phase-change material comprises at least one of biomass-based graphene, copper nanowire foam and Fe3O4 modified biomass-based graphene. Bamboo powder is converted into few-layer graphene through an interlayer type microwave plasma technology, the few-layer graphene is modified by Fe3O4 nanoparticles and then compounded with paraffin, and finally, a two-dimensional heat conduction network-three-dimensional metal framework-nanometer light absorber synergistic structure is constructed through copper nanowire foam packaging. The photothermal conversion efficiency of the prepared composite phase change material reaches 73.47%, the thermal conductivity is improved to 3.157 W.m <-1 >. K <-1 >, the phase change enthalpy retention rate is larger than 98%, and leakage is avoided. The method is suitable for solar heat storage, intelligent building and electronic device heat management, and green and low-cost production is achieved through biomass waste recycling.

The invention discloses a recyclable flexible composite phase change material as well as a preparation method and application thereof, and relates to the technical field of battery thermal management. The lauric acid, the thermoplastic polyester elastomer and the hexagonal boron nitride are simply blended to prepare the recyclable flexible composite phase-change material with wide-temperature flexibility and excellent electrical insulating property, the phase-change material keeps flexibility in a wide temperature range of-15-60 DEG C, can be tightly attached to a battery, is extremely small in temperature fluctuation under continuous vibration, and can be widely applied to the field of lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries and lithium ion batteries. And the short circuit risk is reduced through high insulativity. In addition, the high phase change enthalpy can significantly reduce the working temperature of the battery. And the material also has excellent recoverability, the performance is not attenuated after 10 times of remodeling, and excellent practicability and reliability are shown.

The application relates to a preparation method of a high-thermal-conductivity phase change energy storage material based on bubble jet orientation of graphene nanosheet layers. By introducing high-pressure expanded microspheres into graphene, air jets are generated when the microspheres break, the graphene sheet layers are deflected, a highly oriented graphene skeleton is prepared, high-thermal-conductivity graphene skeletons are obtained through high-temperature graphitization treatment, the phase change energy storage material is filled multiple times through a vacuum-assisted filling method, and a high-thermal-conductivity graphene phase change energy storage composite material is obtained. The high-thermal-conductivity graphene phase change energy storage material has the characteristics of fast response and high heat storage, the response time is shortened by 1 / 2 compared with traditional commercial materials, the thermal conductivity is up to 152 W / (m*K), the bulk phase change enthalpy value is up to 249 kJ / L, and the thermal conductivity and the phase change enthalpy value can be adjusted according to different requirements. Therefore, the novel graphene phase change energy storage material has great application prospect.

The invention discloses a phase-change material based on volume-shrinkage-resistant photo-thermal carbon aerogel, which takes a soft carbon source guar gum GG as a raw material and takes sodium alginate SA as a skeleton support material to achieve a volume-shrinkage-resistant effect; the preparation method comprises the following steps: firstly, preparing G / S hydrogel, then preparing volume-shrinkage-resistant photo-thermal aerogel GS, subsequently preparing volume-shrinkage-resistant photo-thermal carbon aerogel C-GS, and preparing C-GS / PW; the volume shrinkage rate of the C-GS is 28 to 30 percent; and the photothermal conversion efficiency of the C-GS-PW is 88 to 91 percent. The preparation method comprises the following steps: 1, preparing GS; (2) preparing C-GS; and 3, preparation of C-GS / PW. When the material is used as a phase change material, the phase change temperature is 33.15-51.10 DEG C, the phase change enthalpy value is 234.32-255.71 J / g, and the heat conductivity coefficient is 0.3514-0.4366 W / (m.K).