A kind of preparation method of graphene-based lightweight heat-insulating wave-absorbing material

A technology of light-weight thermal insulation and wave-absorbing materials, applied in chemical instruments and methods, sustainable manufacturing/processing, other chemical processes, etc. and other problems, to achieve long-term stability and reliability of thermal insulation performance and wave absorbing performance, avoid shedding failure, and stabilize chemical properties.

Active Publication Date: 2022-07-12
NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP
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Problems solved by technology

[0007] In order to overcome the deficiencies in the prior art, the present invention provides a method for preparing a graphene-based lightweight heat-insulating and wave-absorbing material, which solves the problem of large volume, single function, and difficult use of existing building heat-insulating materials and electromagnetic protection materials. Short life, serious performance degradation, problems of polluting indoor air, and the shortcomings that absorbing materials cannot simultaneously play a role in thermal management when applied to buildings, the prepared materials can have both heat insulation and indoor space electromagnetic wave purification functions

Method used

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  • A kind of preparation method of graphene-based lightweight heat-insulating wave-absorbing material
  • A kind of preparation method of graphene-based lightweight heat-insulating wave-absorbing material
  • A kind of preparation method of graphene-based lightweight heat-insulating wave-absorbing material

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[0034]A method for preparing a graphene-based lightweight heat-insulating wave-absorbing material, comprising the following steps:

[0035] S1. Pretreatment of raw materials: Graphene oxide and carbonylated iron nanoparticles are respectively pretreated. The pretreatment method is as follows: heating and drying at 120°C-160°C for 1 to 2 hours, followed by acetone and ethanol cleaning. Drying treatment; wherein the graphene oxide is a common commercial grade product, and the carbonylation nano-iron particles are analytically pure, with a particle size of 50-200 nm.

[0036] S2. Surface modification of graphene oxide: The pretreated graphene oxide powder in step S1 is uniformly dispersed in N-methylpyrrolidone to obtain a brown-black graphene oxide solution, and the graphene oxide concentration is less than or equal to 0.01g / mL ; Graphene oxide solution is added the N-methylpyrrolidone solution that dissolves ferric amino acid under the continuous stirring of 80 ℃ of nitrogen en...

Embodiment 1

[0044] 1. Raw material pretreatment: take 5 g of carbonylated nano iron powder and 1 g of graphene oxide, and place them in a vacuum oven at 120 ° C for 1 hour to remove the catalyst and residual organic impurities on the powder surface, and then ultrasonically clean the raw material powder with acetone and ethanol successively. Filter and dry under ambient conditions.

[0045] 2. Evenly disperse the pretreated graphene oxide powder in 100 mL of N-methylpyrrolidone to obtain a brown-black solution. Then, the graphene oxide solution was put into a three-necked flask, and the N-methylpyrrolidone solution (the amino iron concentration: 0.01 g / mL) was added to dissolve the amino iron under continuous stirring in a nitrogen environment at 80 °C to make the reaction proceed, and then the obtained reaction mixture was transferred. The mixture was subjected to suction filtration in a hydrothermal kettle for 16 hours in a drying oven at 80°C. During the suction filtration process, eth...

Embodiment 2

[0053] 1. Raw material pretreatment. Take 10 g of carbonylated nano iron powder and 1 g of graphene oxide, and place them in a vacuum oven at 160 ° C for 1.5 hours to remove the catalyst and residual organic impurities on the powder surface, then ultrasonically clean the raw material powder with acetone and ethanol in turn, and filter and dry at room temperature. deal with.

[0054] 2. Evenly disperse the pretreated graphene oxide powder in 100 mL of N-methylpyrrolidone to obtain a brown-black solution. Then, the graphene oxide solution was put into a three-necked flask, and the N-methylpyrrolidone solution (the amino iron concentration: 0.01 g / mL) was added to dissolve the amino iron under continuous stirring in a nitrogen environment at 80 °C to make the reaction proceed, and then the obtained reaction mixture was transferred. The mixture was subjected to suction filtration in a hydrothermal kettle for 24 hours in a drying oven at 80°C. During the suction filtration proces...

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Abstract

The invention relates to the technical field of novel functional materials for construction, and more particularly, to a method for preparing a graphene-based lightweight heat-insulating wave-absorbing material. The magnetic nanoparticles are compounded with graphene, and a lightweight composite heat-insulation / wave-absorbing material is prepared through technological processes such as pretreatment, graphene oxide surface modification, graphene oxide aqueous solution preparation, and composite aerogel synthesis. The powder preparation process is simple, the production cost is low, and it is convenient for industrial production. The prepared thermal insulation / wave absorbing material has excellent electromagnetic wave absorption performance in the frequency range of 2 GHz to 18 GHz, and the thermal insulation effect can be comparable to the current general construction field. Polymer foam, a single lightweight material can not only efficiently maintain heat and heat insulation, but also have good electromagnetic wave absorption function, providing material technical support for thermal management of buildings and purification of electromagnetic environment.

Description

technical field [0001] The invention relates to the technical field of novel functional materials for construction, and more particularly, to a method for preparing a graphene-based lightweight heat-insulating wave-absorbing material. Background technique [0002] As a new solid material with nanoporous structure, aerogel has excellent properties such as light weight, heat insulation, heat preservation and fire prevention, and the density can be as low as 0.002g cm. -3 , the vacuum thermal conductivity can reach 0.02W m at room temperature -1 ·K -1 . Aerogels are widely used in the fields of heat insulation, heat preservation, sound insulation, noise reduction, etc., and have a huge market in the field of energy saving, ranging from aerospace materials, space suits, fire protection suits; as small as cars and thermos cups. Wide range of application requirements. Especially with the improvement of production level, aerogel insulation materials have been gradually applied ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00Y02P20/10
Inventor 贾琨刘伟赵维富王东红马晨王蓬王权
Owner NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP
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