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High thermal conductivity hydrated salt phase change material and preparation method thereof

A technology of phase change materials and hydrated salts, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of reducing the heat storage performance of phase change materials and other performance degradation

Active Publication Date: 2018-02-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method will introduce a new problem, that is, adding a large amount of such additives will lead to a significant decrease in other properties of the phase change material (such as the enthalpy of the phase change material) while improving heat transfer, thereby reducing the performance of the phase change material. Heat storage performance

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  • High thermal conductivity hydrated salt phase change material and preparation method thereof
  • High thermal conductivity hydrated salt phase change material and preparation method thereof
  • High thermal conductivity hydrated salt phase change material and preparation method thereof

Examples

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Embodiment 1

[0056] This embodiment provides a high thermal conductivity hydrated salt phase change material, the preparation method of which comprises the following steps:

[0057] Preparation of reduced graphene aqueous dispersion: Prepare 2mg / mL graphene oxide aqueous dispersion by hummers method; hydrazine hydrate, polyvinylpyrrolidone and graphene oxide aqueous dispersion are magnetically stirred at 400rpm for 30min to disperse evenly; then disperse at 90°C After reacting in a constant temperature box for 2 hours, ultrasonically disperse for 30 minutes to obtain an aqueous dispersion of reduced graphene. Wherein, the mass ratio of hydrazine hydrate to the graphene oxide aqueous dispersion is 2.3:100, and the mass ratio of polyvinylpyrrolidone to the graphene oxide aqueous dispersion is 18.2:100. In this embodiment, polyvinylpyrrolidone is added as a surfactant to improve the dispersion stability of the reduced graphene aqueous dispersion.

[0058] The prepared reduced graphene aqueou...

Embodiment 2

[0065] This embodiment provides a high thermal conductivity hydrated salt phase change material, the preparation method of which comprises the following steps:

[0066]Preparation of reduced graphene aqueous dispersion: Prepare 4 mg / mL graphene oxide aqueous dispersion by hummers method; hydrazine hydrate, polyvinylpyrrolidone and graphene oxide aqueous dispersion are magnetically stirred at 200 rpm for 50 min to disperse uniformly; then disperse at 110 °C After reacting in a constant temperature box for 3 hours, ultrasonically disperse for 50 minutes to obtain an aqueous dispersion of reduced graphene. Wherein, the mass ratio of hydrazine hydrate to the graphene oxide aqueous dispersion is 3:100, and the mass ratio of polyvinylpyrrolidone to the graphene oxide aqueous dispersion is 25:100. In this embodiment, polyvinylpyrrolidone is added as a surfactant to improve the dispersion stability of the reduced graphene aqueous dispersion.

[0067] The prepared reduced graphene aqu...

Embodiment 3

[0070] This embodiment provides a high thermal conductivity hydrated salt phase change material, the preparation method of which comprises the following steps:

[0071] Preparation of reduced graphene aqueous dispersion: prepare 2.5mg / mL graphene oxide aqueous dispersion by hummers method; hydrazine hydrate, polyvinylpyrrolidone and graphene oxide aqueous dispersion are magnetically stirred at 500rpm for 10min to disperse evenly; then disperse at 80 After reacting in an incubator at ℃ for 1 hour, ultrasonically disperse for 10 minutes to obtain an aqueous dispersion of reduced graphene. Wherein, the mass ratio of ethylenediamine to the graphene oxide aqueous dispersion is 1:100, and the mass ratio of polyvinylpyrrolidone to the graphene oxide aqueous dispersion is 10:100. In this embodiment, polyvinylpyrrolidone is added as a surfactant to improve the dispersion stability of the reduced graphene aqueous dispersion.

[0072] The prepared reduced graphene aqueous dispersion was...

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Abstract

The invention relates to the technical field of phase change materials, in particular to a high thermal conductivity hydrated salt phase change material and a preparation method thereof. The preparation method comprises the following steps: preparing reduced graphene aqueous dispersion; mixing the reduced graphene aqueous dispersion with inorganic salt, and then carrying out ultrasonic treatment to obtain the high thermal conductivity hydrated salt phase change material. The hydrated salt phase change material has higher thermal conductivity, and meanwhile, the properties such as enthalpy value of the phase change material are less influenced. Furthermore, the preparation method provided by the invention is wide in application scope; all inorganic hydrated salt phase change energy storagematerials can be prepared into phase change materials with high thermal conductivity and low phase change enthalpy value reduction by utilizing the reduced graphene aqueous dispersions and corresponding salts thereof.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a high thermal conductivity hydrated salt phase change material and a preparation method thereof. Background technique [0002] Phase change materials refer to substances that change the state of matter and provide latent heat as the temperature changes. The process of changing the physical properties of phase change materials is called the phase change process. This process is accompanied by the storage and release of energy, which can effectively improve the utilization rate of energy. In today's society where energy problems are more prominent, this feature of phase change materials is its won a high degree of attention. [0003] Phase change materials can be divided into organic phase change materials and inorganic phase change materials, and can also be divided into hydrated salt phase change materials and waxy phase change materials. Among them, inorganic h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 周园张新星李翔申月孙艳霞曾金波任秀峰马路祥董生德漆贵财
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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