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Mechanically-enhanced electromagnetic shielding film and preparation method thereof

An electromagnetic shielding film and mechanical technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as low strength and poor toughness, and achieve the effects of gentle reaction process, low price and safe process

Active Publication Date: 2018-07-10
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above electromagnetic shielding materials have problems such as low strength and poor toughness, and it is difficult to apply to some fields such as flexible wearable devices, robot joints and electronic weapon equipment that require high mechanical properties. Therefore, it is still necessary to develop a mechanically enhanced high-efficiency Electromagnetic shielding materials to further enhance its application value

Method used

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  • Mechanically-enhanced electromagnetic shielding film and preparation method thereof
  • Mechanically-enhanced electromagnetic shielding film and preparation method thereof
  • Mechanically-enhanced electromagnetic shielding film and preparation method thereof

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preparation example Construction

[0043] In the preparation method according to the present invention with Ti 3 AlC 2 and cellulose raw materials as raw materials, Ti 3 AlC 2 The few-layer MXene is prepared by etching and intercalation, and then the cellulose nanofibers are extracted from the garlic skin. Finally, the few-layer MXene and cellulose nanofibers are mixed and stirred according to a certain ratio, and the membrane is formed by suction filtration. This process does not involve HF, etc. Strong oxidant, gentle reaction process, safe process, good uniformity of the obtained product, is an efficient, quick and environment-friendly method for preparing electromagnetic shielding film.

[0044] In the preparation method according to the present invention, the Ti 3 AlC 2 It is preferably a powder with a particle size ≤ 40um. When Ti 3 AlC 2 When the particle size of Al is larger than 40um, the etching will be incomplete due to the too wide Al layer in the block, which will reduce the quality of the o...

Embodiment 1

[0050] 1) Preparation of few-layer MXene

[0051] Add 1gLiF into 20mL9M HCl solution and stir until completely dissolved; 3 AlC 2 Add to the HCl solution, stir at 35°C for 24h; centrifuge the obtained suspension at 3500r / min×5min, wash with deionized water until the supernatant pH is ≥ 5, pour out the supernatant to obtain multi-layer MXene precipitates; add 300mL deionized water, shake vigorously for 5min, centrifuge at 3500r / min for 1h, collect the supernatant, and obtain the few-layer MXene.

[0052] It can also be based on the existing literature C.J.Zhang, B.Anasori, A.Seral-Ascaso, S.H.Park, N.McEvoy, A.Shmeliov, G.S.Duesberg, J.N.Coleman, Y.Gogotsi, V.Nicolosi, Adv.Mater.2017, Prepared in the manner described in 29.

[0053] 2) Preparation of cellulose nanofibers

[0054] Disperse 10g of garlic peel in 400mL of 2wt% NaOH solution, react at 140°C for 4h, take out deionized water and wash until neutral; the obtained slurry is dispersed in 400mL of 2wt% H 2 SO 4 In t...

Embodiment 2

[0063] Except that the few-layer MXene dispersion and the CNFs dispersion are at a solid content ratio of 1:4, a mechanically enhanced electromagnetic shielding film containing few-layer MXene with a weight content of 20% (less layer MXene-20%).

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Abstract

The invention discloses a mechanically-enhanced electromagnetic shielding film and a preparation method thereof. The electromagnetic shielding film is composed of a few-layer MXene and cellulose nanofibers. In the preparation method of the electromagnetic shielding film provided by the invention, strong oxidizing agents such as HF are not involved, the reaction process is gentle, the process is safe, and the obtained product has good uniformity; the prepared electromagnetic shielding film can withstand up to a tensile stress with 135.3 MPa in a tensile test, and the deformation quantity reaches 16.7%; the electromagnetic shielding film can withstand maximum 14260 bending, shows ultra-high conductivity of 739.4 S / m in a conductivity test, and can reach electromagnetic shielding performanceof 23.8 dB at an ultra-thin thickness of 47[mu]m; and in addition, the electromagnetic shielding film prepared by the method has wide sources of raw materials, low price, safety and environmental protection, and is beneficial to industrialized promotion and application.

Description

technical field [0001] The invention belongs to the field of materials, in particular, relates to a mechanically reinforced electromagnetic shielding film composited with few-layer MXene / cellulose nanofibers (few-layer MXene / CNFs) and a preparation method thereof, and the mechanically enhanced electromagnetic shielding film prepared by the method Electromagnetic shielding film not only has high shielding efficiency, but also can withstand a certain degree of tension and deformation. It has great application potential in the fields of flexible electronic equipment, robot joints and electronic weaponry. Background technique [0002] Electromagnetic shielding materials can absorb or reflect electromagnetic waves emitted by electronic equipment to a certain extent, which not only ensures the normal operation of other electronic equipment, but also protects the human body from electromagnetic pollution. In recent years, more and more researchers have devoted themselves to the stu...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 马明国曹文涛陈峰马畅刘姗敬凡尘王波
Owner BEIJING FORESTRY UNIVERSITY
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