A kind of composite phase change material and preparation method thereof

A composite phase change material and a technology for phase change materials, which are applied in the field of composite phase change materials, can solve the problems of low subcooling and reduce phase separation problems, and achieve the effects of slowing down phase separation, reducing phase separation problems and having broad application prospects.

Active Publication Date: 2021-03-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In this material, three-dimensional graphene provides excellent mechanical properties and structural stability. At the same time, graphene can effectively improve the thermal conductivity without salt accumulation, improve the uniformity of inorganic hydrated salts, reduce the problem of phase separation, and the columns are vertical Conductivity and thermal conductivity have certain anisotropy in the direction of the bottom surface and the direction parallel to the bottom surface, and the Na used in the present invention 2 SO 4 10H 2 Borax is added to O as a nucleating agent, which can effectively solve Na 2 SO 4 10H 2 O low subcooling problem

Method used

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  • A kind of composite phase change material and preparation method thereof
  • A kind of composite phase change material and preparation method thereof
  • A kind of composite phase change material and preparation method thereof

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Embodiment 1

[0032] The graphite oxide solution was prepared by the improved Hummers method in the laboratory. After diluting the graphite oxide solution to 5 mg / ml and ultrasonicating for 1 h, 60 mL was taken in a hydrothermal kettle, kept in a vacuum oven at 180 °C for 16 h, cooled to room temperature, and obtained 3D graphene hydrogels. The hydrogel was pre-frozen for 2 hours, kept in a vacuum freeze dryer at a vacuum degree of ≤100 Pa, and freeze-dried for 24 hours to obtain a three-dimensional sleeve-shaped graphene aerogel.

[0033] excess Na 2 SO 4 10H 2 O and three-dimensional graphene are placed in a beaker, and Na 2 SO 4 10H 2 The amount of O satisfies in Na 2 SO 4 10H 2 O can fully immerse 3D graphene after melting. Seal the beaker with plastic wrap and place it in a vacuum drying oven. 2 SO 4 10H 2 O fully melted. Take out the beaker, and use a syringe needle to poke about 30 to 60 holes in the insurance film, and the pores are evenly distributed.

[0034] The bea...

Embodiment 2

[0036] Graphite oxide solution was prepared in laboratory by improved Hummers method. Dilute the above-prepared graphite oxide solution to 8 mg / ml and sonicate for 2 hours, take 60 ml and place it in a hydrothermal kettle, keep it in a vacuum oven at 180°C for 24 hours, and cool to room temperature to obtain a three-dimensional graphene hydrogel. The hydrogel was pre-frozen for 3 hours, kept in a vacuum freeze dryer at a vacuum degree of ≤100 Pa, and freeze-dried for 36 hours to obtain a three-dimensional sleeve-shaped graphene aerogel.

[0037] Na 2 SO 4 10H 2 O and three-dimensional graphene are placed in a beaker, and Na 2 SO 4 10H 2The amount of O satisfies in Na 2 SO 4 10H 2 O can fully immerse 3D graphene after melting. Seal the beaker with plastic wrap and place it in a vacuum drying oven. 2 SO 4 10H 2 O fully melted. Take out the beaker, and use a syringe needle to pierce the insurance film about 50 times, and the pores are evenly distributed.

[0038] Th...

Embodiment 3

[0040] Graphite oxide solution was prepared in laboratory by improved Hummers method. Dilute the graphite oxide solution prepared above to 7 mg / ml and sonicate for 2 hours, take 45 ml and place it in a hydrothermal kettle, keep it in a vacuum oven at 160°C for 12 hours, and cool to room temperature to obtain a three-dimensional graphene hydrogel. The hydrogel was pre-frozen at -30°C for 4 hours, kept in a vacuum freeze dryer at a vacuum degree of ≤100 Pa, and freeze-dried at -30°C for 24 hours to obtain a three-dimensional sleeve-shaped graphene aerogel.

[0041] Borax, Na 2 SO 4 10H 2 O was mixed evenly at a mass ratio of 1:100, 1:50, 1:33, and 1:25, and the mixture and three-dimensional graphene were placed in a beaker, and the amount of the mixture added was sufficient to completely submerge the three-dimensional graphene after melting. Seal the beaker with plastic wrap and place it in a vacuum drying oven. 2 SO 4 10H 2 O fully melted. Take out the beaker, and use a ...

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Abstract

The invention relates to a composite phase change material and a preparation method thereof. The method comprises the following steps: preparing three-dimensional sleeve-shaped graphene through a hydrothermal technology, and compounding the three-dimensional graphene with a mixed salt through a vacuum impregnation technology to obtain the composite phase change material, wherein the mixed salt comprises borax and Na2SO4.10H2O, a mass ratio of the borax to Na2SO4.10H2O in the mixed salt is (0-1):25, and a mass ratio of the three-dimensional graphene to the mixed salt is 1:(7-10). The three-dimensional sleeve-shaped graphene structure is compounded with the in organic hydrated salt, so a new idea is provided for solving the problems of phase separation and supercooling, the application fieldof the inorganic hydrated salt is greatly widened, and the application prospect is wide; and the three-dimensional graphene / inorganic hydrated salt composite phase change material can be applied to the field of ecologic energy saving of buildings as a phase change large capsule.

Description

technical field [0001] The invention relates to the field of composite phase change materials, in particular to a composite phase change material and a preparation method thereof. Background technique [0002] Graphene has a series of excellent properties that have attracted the attention of researchers. Two-dimensional graphene has the characteristics of large specific surface area and high surface energy, and is prone to agglomeration, which limits its application and promotion in actual production. Three-dimensional graphene (3D-rGO) has stable mechanical properties and retains some excellent properties of two-dimensional graphene, so three-dimensional graphite and its composite materials have broad application prospects. [0003] Inorganic hydrated salts used as phase change materials have the advantages of high phase change latent heat, low phase change temperature, and low environmental pollution. They can be used in cold chain transportation, ecological building ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 张东王亚
Owner TONGJI UNIV
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