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Method for preparing graphene and inorganic salt high-temperature phase change composite material

A composite material and high-temperature phase change technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of easy agglomeration of graphene, etc., and achieve the effect of high energy storage density, large phase change heat, and high thermal conductivity

Inactive Publication Date: 2012-02-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene is easy to agglomerate, how to eliminate the influence of its agglomeration in the preparation process of composite materials is the difficulty in the whole preparation process

Method used

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  • Method for preparing graphene and inorganic salt high-temperature phase change composite material
  • Method for preparing graphene and inorganic salt high-temperature phase change composite material
  • Method for preparing graphene and inorganic salt high-temperature phase change composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of graphene / inorganic salt high-temperature phase-change composite material, its technological process is as follows figure 1 As shown, the method includes the following steps:

[0029] According to the mass ratio of 5.5:4.5, weigh 1.10g LiNO with YP102N electronic balance 3 , 0.90g NaNO 3 Configure 250ml of 8mg / ml mixed nitrate solution. Take 10ml of 8mg / ml mixed nitrate solution, add a certain amount of surfactant sodium dodecyl sulfate SDS, and stir until the mixture is uniform. Stir with a constant temperature magnetic stirrer for 20 minutes, and ultrasonically disperse for 20 minutes. Measure 20 ml of 1 mg / ml reduced graphene oxide sol, add it to the above mixed solution, and stir rapidly until the reduced graphene oxide sol is uniformly dispersed in the mixed solution to obtain a composite material preform.

[0030] Put the composite material preform in a plastic box covered with tinfoil, seal it with plastic wrap, and put it into ...

Embodiment 2

[0033] Weigh 2.25gKNO with YP102N electronic balance 3 Configure 9mg / ml KNO 3 Solution 250ml; Take 9mg / ml KNO 3 Solution 10ml, add a certain amount of surfactant sodium dodecyl sulfate SDS, stir until mixed evenly. Stir with a constant temperature magnetic stirrer for 20 minutes, and ultrasonically disperse for 20 minutes; measure 10 ml of 1 mg / ml reduced graphene oxide sol, add it to the above mixed solution, and stir rapidly until the reduced graphene oxide sol is evenly dispersed in the mixed solution to obtain a composite material preform.

[0034] Put the composite material preform in a plastic box covered with tinfoil, seal it with plastic wrap, and put it into an ultra-low temperature freezer for quick freezing while keeping it level. When the liquid mixture is frozen into a solid state, take it out, seal the plastic box with tinfoil instead of plastic wrap, poke a few fine holes on the tinfoil cover, put it into a vacuum freeze-drying and dispersing device for vacuum...

Embodiment 3

[0037] Such as figure 1 Shown, a kind of graphene / inorganic salt high-temperature phase-change composite material and preparation method thereof, the method comprises the following steps:

[0038] Weigh 2.00gKNO with YPl02N electronic balance 3 Configure 8mg / ml KNO 3 Solution 250ml; Take 8mg / ml KNO 3 Solution 10ml, add a certain amount of surfactant sodium dodecyl sulfate SDS, stir until evenly mixed; stir with a constant temperature magnetic stirrer for 20min, ultrasonically disperse for 20min; measure 1mg / ml reduced graphene oxide sol 20ml, add the above mixed solution , stirring rapidly until the reduced graphene oxide sol is uniformly dispersed in the mixed solution to obtain a composite material preform.

[0039] Put the composite material prefabricated body in a plastic box covered with tinfoil, seal it with plastic wrap, put it into an ultra-low temperature freezer for quick freezing, and keep it level; when the liquid mixture freezes into a solid state, take it out ...

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Abstract

The invention relates to a method for preparing a graphene and inorganic salt high-temperature phase change composite material. The method comprises the following steps of: (1) preparing graphene sol; (2) preparing an inorganic salt solution, adding a surfactant, and mixing uniformly; (3) adding the graphene sol into the inorganic salt solution, and stirring until the graphene sol and the inorganic salt solution are mixed uniformly to obtain a composite material preform; (4) putting the composite material preform into an ultra-low-temperature freezer, quickly freezing to form a solid and taking out; (5) putting the solid-state composite material preform into a vacuum freezing dispersion drying instrument and drying; and (6) taking out after the drying of the composite material preform is finished, and calcining until the moisture is completely removed to obtain a grapheme / inorganic salt phase change composite material. Compared with the prior art, the method has the advantages that: the process is reasonable, easy to operate and low in cost; and the prepared grapheme / inorganic salt phase change composite material has the advantages of high coefficient of heat conductivity, high energy storage density and the like, has excellent performance, can meet different application requirements, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a graphene and inorganic salt high-temperature phase-change composite material. Background technique [0002] With the increasing international energy demand, clean solar energy has attracted much attention due to the limitation of storage, environment and output of traditional fossil energy. Solar thermal power generation is the most effective solar energy utilization technology. In this technology, due to the high temperature generated by solar energy concentration, selecting a reliable high-temperature heat transfer and heat storage working medium is the key to improving the efficiency of solar thermal power generation. [0003] At present, phase change energy storage is a more effective energy storage method. In practical applications, the phase transition temperature of existing phase change energy storage systems is mostly below mediu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 张东周春玉张震雷
Owner TONGJI UNIV
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