Preparation method of graphene-based light 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: 2020-04-03
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

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preparation example Construction

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

[0035] S1. Pretreatment of raw materials: pretreatment of graphene oxide and carbonylated nano-iron particles respectively. The pretreatment method is as follows: heat and dry at 120°C-160°C for 1~2 hours, and then wash with acetone and ethanol in turn. Drying treatment; wherein the graphene oxide is a common commercial grade product, and the carbonylated nano-iron particles are analytically pure, with a particle size of 50-200nm.

[0036] S2. Surface modification of graphene oxide: uniformly disperse the pretreated graphene oxide powder in step S1 in N-methylpyrrolidone to obtain a brown-black graphene oxide solution with a graphene oxide concentration ≤ 0.01g / mL ; The graphene oxide solution was added to the N-methylpyrrolidone solution dissolving iron amino under constant stirring in a nitrogen environment at 80°C, the iron amino concentr...

Embodiment 1

[0044] 1. Pretreatment of raw materials: Take 5g of carbonylated nano-iron powder and 1g 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 use acetone and ethanol to ultrasonically clean the raw material powder in turn. Filter and dry at ambient conditions.

[0045] 2. Evenly disperse the pretreated graphene oxide powder in 100mL N-methylpyrrolidone to obtain a brown-black solution. Afterwards, put the graphene oxide solution into a three-necked flask, add N-methylpyrrolidone solution (iron amino concentration 0.01g / mL) dissolved in N-methylpyrrolidone solution (iron amino concentration: 0.01g / mL) under constant stirring in a nitrogen atmosphere at 80°C to allow the reaction to proceed, and then transfer the obtained reaction mixture to Put it into a hydrothermal kettle and react in a drying oven at 80°C for 16 hours, then filter the mixed solution with suction, wash wi...

Embodiment 2

[0053] 1. Raw material pretreatment. Take 10g of carbonylated nano-iron powder and 1g 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 use acetone and ethanol to ultrasonically clean the raw material powder, and filter and dry at room temperature deal with.

[0054] 2. Evenly disperse the pretreated graphene oxide powder in 100mL N-methylpyrrolidone to obtain a brown-black solution. Then put the graphene oxide solution into a three-necked flask, add N-methylpyrrolidone solution (iron amino concentration 0.01g / mL) dissolved in N-methylpyrrolidone solution (iron amino concentration: 0.01g / mL) under constant stirring in a nitrogen atmosphere at 80°C to allow the reaction to proceed, and then transfer the obtained reaction mixture to Put it into a hydrothermal kettle and react in a drying oven at 80°C for 24 hours, then filter the mixture with suction, wash it repeatedly w...

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Abstract

The invention relates to the technical field of a preparation method of graphene-based light heat-insulating wave-absorbing material and particularly relates to a preparation method of a graphene-based light heat-insulating wave-absorbing material. According to the preparation method, the magnetic nanoparticles and graphene are compounded, the light composite heat-insulating wave-absorbing material is prepared through the technological processes of pretreatment, graphene oxide surface modification, graphene oxide aqueous solution preparation, composite aerogel synthesis and the like. The powder is simple in preparation process, low in production cost and convenient for industrial production, the prepared heat-insulating wave-absorbing material has excellent electromagnetic wave absorptionperformance in a frequency band range of 2GHz to 18GHz, meanwhile, the heat insulation effect can be comparable with that of polymer foam commonly used in the current building field, the efficient heat preservation and heat insulation and a good electromagnetic wave absorption function of a single light material can be achieved, and material technical support is provided for heat management and electromagnetic environment purification of buildings.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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