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Preparation method and application of a kind of electromagnetic shielding material
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An electromagnetic shielding material, graphene technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of single electromagnetic shielding band and high density, and achieve the effect of low density, high conductivity, and high specific surface area
Active Publication Date: 2019-12-10
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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[0009] In order to solve the problems of high density and single electromagnetic shielding band in the prior art, the invention provides a preparation method and application of the electromagnetic shielding material. The electromagnetic shielding material prepared by the invention has low density and multiple electromagnetic shielding bands. Advantages
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preparation example Construction
[0046] The present invention provides a kind of preparation method of electromagnetic shielding material in the first aspect, described method comprises the following steps:
[0047] (1) Preparation of sol: use water to prepare precursor solution with phenolic substance and weakly basic catalyst, then disperse graphene oxide solution in the precursor solution, obtain the precursor mixed solution containing graphene oxide, and then Adding aldehydes into the mixed precursor solution containing graphene oxide and mixing uniformly to prepare novolac sol containing graphene oxide.
[0048] (2) Preparation of graphene oxide composite phenolic aerogel: the phenolic sol containing graphene oxide prepared in step (1) is carried out successively in the steps of gelation and aging, solvent replacement and drying to obtain graphene oxide composite phenolic aerogel airgel.
[0049] (3) Preparation of graphene-composite carbon airgel: the graphene oxide-composite phenolic aerogel prepared ...
Embodiment 1
[0070] ① Preparation of sol
[0071] Weigh 5.5g of resorcinol in a beaker, add 10g of sodium carbonate solution with a mass fraction of 1% into the beaker, then weigh 59g of deionized water in the beaker, and stir magnetically until the resorcinol is completely dissolved. Obtain precursor solution; Then weigh 20mL of graphene oxide solution of 26g / L and add in the precursor solution, after stirring for 5min, ultrasonic 20min, obtain the precursor mixed solution containing graphene oxide; Then weigh 9g formaldehyde and add In the graphene oxide precursor mixed solution, magnetically stirred for 5 minutes to obtain a novolac sol containing graphene oxide.
[0072] ② Preparation of graphene oxide composite phenolic airgel
[0073] The prepared phenolic sol containing graphene oxide was subpackaged and sealed, and placed in an oven at 80°C for gelation and aging for 3 days; then the gelled and aged gel was carefully separated from the container, and the gel was placed in a In a ...
Embodiment 2
[0082] Example 2 is basically the same as Example 1, except that 30 mL of 26 g / L graphene oxide solution is weighed and added to the precursor solution, and the doping amount of graphene is 4.5%.
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Abstract
The invention relates to a preparation method and application of an electromagnetic shielding material. The method comprises the steps of: preparing a sol to obtain a phenolic aldehyde sol containinggraphene oxide; carrying out gelatinization and aging on the phenolic aldehyde sol containing graphene oxide and carrying out solvent replacement and drying successively to obtain a graphene-oxide composite phenolic aldehyde aerogel; carrying out pyrolysis on the graphene-oxide composite phenolic aldehyde aerogel to obtain a graphene composite carbon aerogel; and carrying out pulverizing processing on the graphene composite carbon aerogel to obtain an electromagnetic shielding material. The prepared electromagnetic shielding material has the low density and is capable of shielding electromagnetic signals of multiple bands simultaneously, wherein the electromagnetic shielding performance for visible light reaches over 90% and the electromagnetic shielding performance for infrared light reaches above 70%. Besides, application of the graphene composite carbon aerogel electromagnetic shielding material in the electromagnetic shielding field is realized effectively by combining the spreading technology.
Description
technical field [0001] The invention belongs to the technical field of airgel preparation, and in particular relates to a preparation method and application of a lightweight electromagnetic shielding material. Background technique [0002] Due to the emergence of various new technologies such as new radar technology, stealth technology, laser, and infrared guidance, the jamming technology to counter them has developed rapidly. Passive jamming materials weaken and cover detection signals by scattering, reflecting, and absorbing electromagnetic waves such as visible light, infrared waves, and radar waves, so as to hide the real target. Currently commonly used visible light / infrared interference materials are mainly smoke screen materials, which attenuate light radiation by forming aerosols suspended in the atmosphere; radar interference materials mainly include metal foil, glass filaments coated with metal coatings / nylon filaments, chopped carbon fibers, Expanded graphite, me...
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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 张恩爽李文静刘斌刘圆圆李健裴雨辰赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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