Lignin/reduced graphene oxide carbon aerogel electromagnetic shielding material as well as preparation method and application thereof

An electromagnetic shielding material, carbon aerogel technology, applied in the fields of magnetic field/electric field shielding, graphene, carbon preparation/purification, etc., to improve the preparation efficiency and raw material utilization, weaken the volume shrinkage phenomenon, and improve the interface polarization effect. Effect

Pending Publication Date: 2021-06-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of polymer materials from lignin is one of the ways to make high-value utilization of this abundant renewable resource, but the application of lignin in aerogels has rarely been reported.

Method used

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  • Lignin/reduced graphene oxide carbon aerogel electromagnetic shielding material as well as preparation method and application thereof
  • Lignin/reduced graphene oxide carbon aerogel electromagnetic shielding material as well as preparation method and application thereof
  • Lignin/reduced graphene oxide carbon aerogel electromagnetic shielding material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Take a certain amount of lignin to make 20wt% aqueous solution, dissolve it with sodium hydroxide, adjust the pH to about 11, stir for 24 hours to fully dissolve the lignin; centrifuge the solution for 10min with a centrifuge at a speed of 10000r / min, and take the supernatant The liquid is a lignin alkali solution; the solid content of the lignin solution is measured 3 times with a fast moisture evaporator, and the average value is the lignin mass fraction (16.94wt%) in the lignin solution. Take 0.12g each of graphene oxide and L-ascorbic acid, dissolve them in 20mL of deionized water, add 0.0745g of lignin alkali solution, mix well, and use an ultrasonic cell pulverizer to perform ultrasonic cavitation, cavitation time is 5 minutes, and the power is 200W , the cavitation interval is cavitation 3s stop 2s. Put the ultrasonically cavitated solution into an oven at 70°C to react and reduce graphene oxide for 3 hours. After taking it out, wash the hydrogel alternately with...

Embodiment 2

[0049] Take a certain amount of lignin to make 20wt% aqueous solution, dissolve it with sodium hydroxide, adjust the pH to about 11, stir for 24 hours to fully dissolve the lignin; centrifuge the solution for 10min with a centrifuge at a speed of 10000r / min, and take the supernatant The liquid is a lignin alkali solution; the solid content of the lignin solution is measured 3 times with a fast moisture evaporator, and the average value is the lignin mass fraction (16.94wt%) in the lignin solution. Take 0.12g each of graphene oxide and L-ascorbic acid, dissolve them in 20mL of deionized water, add 0.1574g of lignin alkali solution, mix well, and use an ultrasonic cell pulverizer to perform ultrasonic cavitation, cavitation time is 5 minutes, and the power is 200W , the cavitation interval is cavitation 3s stop 2s. Put the ultrasonically cavitated solution into an oven at 70°C to react and reduce graphene oxide for 3 hours. After taking it out, wash the hydrogel alternately with...

Embodiment 3

[0052] Take a certain amount of lignin to make 20wt% aqueous solution, dissolve it with sodium hydroxide, adjust the pH to about 11, stir for 24 hours to fully dissolve the lignin; centrifuge the solution for 10min with a centrifuge at a speed of 10000r / min, and take the supernatant The liquid is a lignin alkali solution; the solid content of the lignin solution is measured 3 times with a fast moisture evaporator, and the average value is the lignin mass fraction (16.94wt%) in the lignin solution. Take 0.12g each of graphene oxide and L-ascorbic acid, dissolve them in 20mL of deionized water, add 0.3549g of lignin alkali solution, mix well, and use an ultrasonic cell pulverizer for ultrasonic cavitation. The cavitation time is 5 minutes and the power is 200W. , the cavitation interval is cavitation 3s stop 2s. Put the ultrasonically cavitated solution into an oven at 70°C to react and reduce graphene oxide for 3 hours. After taking it out, wash the hydrogel alternately with de...

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Abstract

The invention discloses a lignin/reduced graphene oxide carbon aerogel electromagnetic shielding material as well as a preparation method and application thereof. Carbonized lignin is used as a conductive skeleton, polarization loss and conductive loss are improved, graphene oxide is introduced as a conductive filler, and the composite carbon aerogel which can resist volume shrinkage and is of a directional pore channel network structure is constructed through ultrasonic cavitation, oxidation reduction, freeze drying and high-temperature carbonization treatment. The preparation of the hydrophobic electromagnetic shielding material with high electromagnetic shielding effectiveness, low density and high conductivity is realized. The raw materials are wide in source and environmentally friendly, the solvent system is non-toxic and cheap, the material preparation process is simple, and the production cost is low. The electromagnetic shielding material with wide frequency and high efficiency is widely applied to military equipment, space flight and aviation, microwave darkrooms, electromagnetic information leakage protection, portable mobile equipment and the like.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding materials, in particular to a lignin / reduced graphene oxide carbon airgel electromagnetic shielding material and its preparation method and application. Background technique [0002] With the development of science and technology, the wide application of various electromagnetic radiation systems such as mobile phones, computers, and televisions has brought about increasingly serious electromagnetic pollution problems. Electromagnetic radiation has brought great challenges to the application and design of various electronic systems, and has also brought more and more disasters and accidents to people's lives. Electromagnetic radiation refers to the phenomenon that electromagnetic waves generated by the interactive changes of electric field and magnetic field are emitted or leaked into the air. In recent years, the rapid development of the telecommunications and electronics industries has i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/19C01B32/194H05K9/00
CPCC01B32/05C01B32/19C01B32/194H05K9/0081
Inventor 邱学青刘华章钱勇杨东杰楼宏铭易聪华
Owner SOUTH CHINA UNIV OF TECH
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