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Phase-change composite material filled with graphene nanosheets and preparation method

A technology of phase-change composite materials and nano-graphene, which is applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problem of low thermal conductivity of phase-change energy storage materials, and achieve the effect of improving thermal conductivity

Active Publication Date: 2018-12-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a phase-change composite material filled with nano-graphene sheets and a preparation method to solve the problem of low thermal conductivity of phase-change energy storage materials existing in the prior art

Method used

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  • Phase-change composite material filled with graphene nanosheets and preparation method
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  • Phase-change composite material filled with graphene nanosheets and preparation method

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preparation example Construction

[0026] see figure 1 , the preparation method of the phase-change composite material that fills nano-graphene sheet, comprises the steps:

[0027] The first step: completely melt the n-octadecane solid that has been dried and pretreated;

[0028] The second step: adding the nano-graphene sheet and the hyperdispersant to the liquid phase n-octadecane in proportion to obtain a mixed suspension; the ratio of the nano-graphene sheet to n-octadecane is: 1:15~1: 200; the graphene nano sheet is a multi-layer structure with less than 20 layers. The hyperdispersant accounts for 0.1% of the total mass of the entire composite phase change material.

[0029] Step 3: Stir with a stirrer to mix the suspension evenly;

[0030] Step 4: Put the uniformly mixed suspension into an ultrasonic cleaning machine and oscillate ultrasonically to make the nano-graphene sheets form a stable three-dimensional heat-conducting network structure inside n-octadecane;

[0031] The fifth step: the suspensio...

Embodiment 1

[0034] The preparation method of the phase-change composite material filled with nano-graphene sheet, comprises the steps:

[0035] Step 1: Weigh 49.7g of dried and pretreated n-octadecane solid with an electronic balance and place it in a reagent bottle, move it to a constant temperature magnetic stirrer panel and heat until completely melted, and set the temperature to 65°C.

[0036] Step 2: After keeping the n-octadecane in a molten state for 30 minutes, add 0.25 g of graphene nanosheets and 0.05 g of hyperdispersant Disper S35 into the n-octadecane in liquid phase.

[0037] Step 3: first put the magnetic core into the reagent bottle, adjust the constant temperature magnetic stirrer to 450r / min, keep the temperature constant, and stir the composite phase change material suspension for 3 hours.

[0038] Step 4: Then take out the magnetic core, and place the reagent bottle in an ultrasonic cleaning machine for 30 minutes of ultrasonic vibration.

[0039] Step 5: Allow the su...

Embodiment 2

[0041] The preparation method of the phase-change composite material filled with nano-graphene sheet, comprises the steps:

[0042] Step 1: Weigh 49.2 g of dried and pretreated n-octadecane solid with an electronic balance and place it in a reagent bottle, move it to a constant temperature magnetic stirrer panel and heat until completely melted, and set the temperature to 65°C.

[0043] Step 2: After keeping the n-octadecane in a molten state for 30 minutes, add 0.75 g of nano-graphene sheets into the n-octadecane in liquid phase.

[0044] Step 3: first put the magnetic core into the reagent bottle, adjust the constant temperature magnetic stirrer to 450r / min, keep the temperature constant, and stir the composite phase change material suspension for 3 hours.

[0045] Step 4: Then take out the magnetic core, and place the reagent bottle in an ultrasonic cleaning machine for 30 minutes of ultrasonic vibration.

[0046]Step 5: Allow the suspension of the composite phase-change m...

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Abstract

The invention discloses a phase-change composite material filled with graphene nanosheets and a preparation method. The preparation method for the phase-change composite material filled with graphenenanosheets is characterized by comprising the following steps: (step 1) n-octadecane solid which already undergoes drying pretreatment is completely melted; (step 2) graphene nanosheets and superdispersant are added into liquid-phase n-octadecane according to a proportion, so that a mixed suspension is obtained; (step 3) an agitator is used for agitation, so that the suspension is uniformly mixed;(step 4) the uniformly mixed suspension is poured into an ultrasonic cleaner and ultrasonically oscillated, so that the graphene nanosheets are formed into a stable three-dimensional heat conductionnetwork structure inside n-octadecane; (step 5) the suspension obtained in step 4 is naturally cooled to be solidified, and thereby the phase-change composite material with n-octadecane as a matrix which is filled with the graphene nanosheets is obtained. The phase-change composite material and the preparation method disclosed by the invention can be widely applied in fields, such as energy.

Description

technical field [0001] The invention relates to a phase-change composite material, in particular to a phase-change composite material filled with nanographene sheets and a preparation method thereof. Background technique [0002] The phase change material absorbs or releases the latent heat of phase change during the phase change process, and is the medium for realizing phase change energy storage. Compared with sensible heat materials, phase change materials have a high density of latent heat storage, and can quickly absorb and release a large amount of heat under approximately constant temperature conditions. At the same time, phase change materials also have the advantages of suitable phase change temperature, small size, large phase change latent heat value, and easy control. However, phase change materials generally have the disadvantage of low thermal conductivity. Low thermal conductivity will lead to low conversion efficiency of the heat storage system of phase chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李静蔡迪焦乃勋李猛孙宽
Owner CHONGQING UNIV
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