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A kind of modified graphene and n-octadecane phase change composite material and preparation method

A phase change composite material and n-octadecane technology are applied in the field of modified graphene and n-octadecane phase change composite materials and preparation, can solve the problems of low thermal conductivity of phase change energy storage materials and the like, and achieve a simple preparation method. , The effect of improving thermal conductivity and improving thermal conductivity

Active Publication Date: 2021-07-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a modified graphene and n-octadecane phase change composite material and its 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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  • A kind of modified graphene and n-octadecane phase change composite material and preparation method
  • A kind of modified graphene and n-octadecane phase change composite material and preparation method
  • A kind of modified graphene and n-octadecane phase change composite material and preparation method

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Embodiment 1

[0034] A preparation method of modified graphene oxide, the method may further comprise the steps:

[0035] Step A. Disperse graphene oxide GO in N,N-dimethylformamide DMF under the condition of condensation and reflux, and add thionyl chloride SOCl 2 , reacted at 80°C for 12 hours, the carboxyl group of graphene oxide and thionyl chloride underwent acyl chloride reaction to generate acyl chloride group to obtain the reaction product; in this step, graphene oxide GO and thionyl chloride SOCl 2 The ratio of the amount added is 1:1~200, N,N-dimethylformamide DMF and thionyl chloride SOCl 2 The ratio of adding amount is 1:1~10.

[0036] Step B, with organic solvent dichloromethane CH 2 Cl 2 The reaction product obtained in step A was washed and dried in a vacuum oven at 60 °C to obtain an intermediate product; it could be observed that the graphene oxide was transformed from a yellow-brown fluffy powder to a black powder, and the intermediate product had covalent functionaliza...

Embodiment 2

[0040] A preparation method of modified graphene oxide, carried out as follows:

[0041] 1. Under the condition of condensation and reflux, disperse 1g of graphene oxide GO in 30g of 99.5% N,N-dimethylformamide DMF, and add 150g of SOCl 2 Treat at 80°C for 12h.

[0042] 2. Use 500g dichloromethane CH 2 Cl 2 The reaction product was washed and dried in a vacuum oven at 60 °C to obtain graphene oxide covalently functionalized with acid chloride groups, labeled as the intermediate GO-COCl.

[0043]3. Add 2g of the intermediate product GO-COCl, 30g of stearyl alcohol, 3g of triethylamine TEA, 15g of toluene and 15g of N,N-dimethylformamide DMF into a round bottom flask equipped with a magnetic stirrer core and a reflux condenser and stirred at 85°C for 1 h to disperse the particles and fully dissolve the stearyl alcohol.

[0044] 4. The mixture obtained in step 3 is condensed and refluxed for a period of time, about 120 hours, then the product obtained by the condensation reac...

Embodiment 3

[0047] A kind of preparation method of modified graphene oxide, this method is different from embodiment 2:

[0048] 1. Under the condition of condensation and reflux, disperse 1g of graphene oxide GO in 10g of N,N-dimethylformamide DMF, and add 40g of SOCl 2 Treat at 80°C for 12h.

[0049] 3. Add 2g graphene oxide GO-COCl, 2g stearyl alcohol, 2g triethylamine TEA, 10g toluene and 10g N,N-dimethylformamide DMF to a round bottom equipped with a magnetic stirrer core and a reflux condenser flask, and stirred at 85°C for 1 h to disperse the particles and fully dissolve the stearyl alcohol.

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Abstract

The invention discloses a modified graphene and n-octadecane phase change composite material and a preparation method; a preparation method of modified graphene oxide, which is characterized in that: the method comprises the following steps: under the condition of condensation and reflux, Disperse graphene oxide in N,N-dimethylformamide, and add thionyl chloride for acid chlorination reaction to obtain a reaction product; wash the obtained reaction product with an organic solvent, and dry it in a vacuum oven to obtain an intermediate product; the obtained intermediate product is mixed with stearyl alcohol, triethylamine, toluene and N,N-dimethylformamide, and stirred to disperse the particles and fully dissolve the stearyl alcohol; the mixture is condensed and refluxed, Carrying out the condensation reaction for a period of time, then filtering the product obtained by the condensation reaction, washing the product several times with an organic solvent, and drying to obtain the modified graphene oxide; the invention can be widely used in energy, electronic component temperature control, construction and other fields.

Description

technical field [0001] The invention relates to modified graphene and a phase change composite material, in particular to a modified graphene and n-octadecane phase change composite material and a preparation method. 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 sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198C01B32/194C09K5/06
CPCC01P2004/01C09K5/063C01B32/194C01B32/198
Inventor 李静蔡迪李绍伟孙宽李猛
Owner CHONGQING UNIV
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