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Composite phase change material based on sponge-like graphene oxide and its preparation method

A composite phase change material, sponge-like technology, applied in the field of composite phase change materials based on graphene oxide and its preparation, can solve the problems of limited phase change materials, low material enthalpy, poor adsorption effect, etc., to reduce the amount of addition , Reduce production cost, small size effect

Active Publication Date: 2020-09-15
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many carrier materials that can fix phase change materials, such as montmorillonite, metal foam, expanded graphite and graphite flakes, etc., but montmorillonite has the disadvantage of low thermal conductivity in these materials, metal foam, expanded graphite and Although graphite flakes have high thermal conductivity, due to poor adsorption effect, the phase change substances that can be fixed are limited, resulting in low material enthalpy. In addition, there are existing technologies that use three-dimensional structures such as molecular sieves and aerogels as carrier materials, but These materials are limited in their applications due to their large size

Method used

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  • Composite phase change material based on sponge-like graphene oxide and its preparation method
  • Composite phase change material based on sponge-like graphene oxide and its preparation method
  • Composite phase change material based on sponge-like graphene oxide and its preparation method

Examples

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Effect test

Embodiment 1

[0030] The preparation method of the composite phase change material based on spongy graphene oxide, its steps are as follows:

[0031] (1) prepare graphene oxide:

[0032] Place the flask in an ice-water bath at 0°C, add 70mL of concentrated sulfuric acid and 3g of graphite powder into the flask, stir evenly, and then slowly add 14g of KMnO 4 Carry out the reaction, after 3 hours of reaction, transfer the reaction system to a 35°C oil bath, continue the reaction for 2 hours, add distilled water dropwise, and raise the temperature at a rate of 1°C / min, observe the color of the solution during the heating process, and raise the temperature to 75~ At 85°C, when the solution starts to turn from black to golden yellow, stop adding water. The solution was poured into dilute aqueous hydrogen peroxide solution, and the precipitate was static. Pour out the supernatant, wash the precipitate twice with 10v% HCl solution, wash once with water and once with ethanol, and dry in an oven a...

Embodiment 2

[0052] The preparation method of the composite phase change material based on spongy graphene oxide has the same steps as in Example 1, except that the mass ratio of spongy graphene oxide to polyethylene glycol monomethyl ether is 10:90.

[0053] The final composite phase change material based on spongy graphene oxide is mainly composed of spongy graphene oxide and polyethylene glycol monomethyl ether fixed in spongy graphene oxide. The phase change material does not leak or deform within 320°C, and its enthalpy retention rate is 101.2%.

Embodiment 3

[0055] The preparation method of the composite phase change material based on spongy graphene oxide, its steps are basically the same as in Example 1, the difference is that the mass ratio of spongy graphene oxide to polyethylene glycol monomethyl ether is 2:98.

[0056] The final composite phase change material based on spongy graphene oxide is mainly composed of spongy graphene oxide and polyethylene glycol monomethyl ether fixed in spongy graphene oxide. A small amount of phase change material precipitates at 50°C, and a large amount of phase change material precipitates without deformation at 100°C, and the enthalpy retention rate of the phase change material is 99.2%. Compared with Comparative Example 1, it was found that the addition of spongy graphene oxide significantly improved the heat setting performance of the composite phase change material. When the spongy graphene oxide was added at 2wt%, the material leaked a lot at 100 ° C, and still Stays in good shape.

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Abstract

The invention relates to a spongy oxidized graphene-based composite phase change material, and a preparation method thereof. The preparation method comprises following steps: physical immersion methodis adopted to realize combination of spongy oxidized graphene with a phase change substance so as to obtain the spongy oxidized graphene-based composite phase change material, wherein the spongy oxidized graphene is prepared through freeze drying. The spongy oxidized graphene-based composite phase change material is mainly composed of spongy oxidized graphene and the phase change substance whichis immobilized in the spongy oxidized graphene, the lowest content of spongy oxidized graphene when leakage is avoided at 250 to 320 DEG C ranges from 8 to 10wt%. The preparation method is simple; operation is convenient; and cost is low. The spongy oxidized graphene-based composite phase change material is low in carrier material adding amount, low in cost, high in enthalpy value, small in size,and promising in prospect.

Description

technical field [0001] The invention belongs to the field of preparation of phase-change spinning substrates, and relates to a composite phase-change material based on graphene oxide and a preparation method thereof. Background technique [0002] Energy is the foundation of human survival and development, but today, energy shortage has become one of the major problems restricting social development. Because Phase Change Material (PCM) can solve the contradiction between energy storage and release in time and space, it is widely used in heat storage technology, which can achieve energy saving and emission reduction. At present, phase change materials have good applications in the fields of industrial waste heat recovery, solar thermal utilization, building thermal insulation, textile and clothing, and agriculture. Combining phase change materials with fiber textile technology can produce fibers with heat storage and temperature regulation properties, called phase change fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 陈龙孙俊芬包建坤潘丹郑伟龙
Owner DONGHUA UNIV
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