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Flexible high-strength MXene-based electromagnetic shielding composite film and preparation method thereof

An electromagnetic shielding and composite film technology, which is applied in the directions of synthetic cellulose/non-cellulose material pulp/paper, textiles and papermaking, paper making machines, etc. Weakness, etc.

Active Publication Date: 2020-10-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently used polymers and organic nanofibers have low mechanical properties and weak interfacial interactions with MXene, which limit the strengthening and toughening effect on MXene films.
In addition, the introduced polymer molecular chains and organic nanofibers increase the contact resistance between adjacent MXene sheets, leading to a decrease in the electrical conductivity and electromagnetic shielding properties of the composite film.

Method used

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  • Flexible high-strength MXene-based electromagnetic shielding composite film and preparation method thereof
  • Flexible high-strength MXene-based electromagnetic shielding composite film and preparation method thereof
  • Flexible high-strength MXene-based electromagnetic shielding composite film and preparation method thereof

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preparation example Construction

[0034] The preparation method of the flexible high-strength MXene-based electromagnetic shielding composite film of the present invention specifically comprises the following steps:

[0035] Step 1, immerse the para-aramid fiber into the mixed solution of potassium hydroxide and dimethyl sulfoxide, and stir at room temperature to obtain a deep red aramid nanofiber dispersion; Lun nanofibers have a diameter of 5-20nm and a length of 5-20μm;

[0036] In step 1, the aramid nanofiber is based on a kind of para-aramid yarn fiber, para-aramid chopped fiber, and para-aramid fabric fiber as a raw material, and mixed solution of potassium hydroxide and dimethyl sulfoxide It is prepared in the system, and the ratio of para-aramid fiber, potassium hydroxide and dimethyl sulfoxide is 0.5-1.5g:1-2g:100-1000mL;

[0037] Wherein step 1, the aramid nanofiber dispersion liquid can be uniformly dispersed in deionized water, the aramid nanofiber diameter is 5-20nm, the length is 5-20μm, and the...

Embodiment 1

[0053] A flexible and high-strength MXene-based electromagnetic shielding composite film including Ti 3 C 2 T x MXene, silver nanowires and aramid nanofibers; Ti in flexible high-strength MXene-based electromagnetic shielding composite films 3 C 2 T x The mass fraction of MXene / silver nanowires is 10%; Ti in the flexible and high-strength MXene-based electromagnetic shielding composite film 3 C 2 T x The mass ratio of MXene to silver nanowires is 10:0.5; aramid nanofibers are prepared from para-aramid yarn fibers in a mixed solution of potassium hydroxide and dimethyl sulfoxide, and aramid nanofibers Fiber diameter is 5-20nm, length is 5-20μm; Ti 3 C2 T x The size of the MXene sheet is 100-300nm; the diameter of the silver nanowire is 20-50nm, and the aspect ratio is 500-1000; the hot-pressing pressure of the flexible and high-strength MXene-based electromagnetic shielding composite film is 0.5MPa.

[0054] The preparation method of flexible high-strength MXene-ba...

Embodiment 2

[0056] Flexible and high-strength MXene-based electromagnetic shielding composite films, including Ti 3 C 2 T x MXene, silver nanowires and aramid nanofibers; Ti in flexible high-strength MXene-based electromagnetic shielding composite films 3 C 2 T x The mass fraction of MXene / silver nanowires is 20%; Ti in the flexible and high-strength MXene-based electromagnetic shielding composite film 3 C 2 T x The mass ratio of MXene to silver nanowires is 10:1; aramid nanofibers are prepared from para-aramid chopped fibers in a mixed solution of potassium hydroxide and dimethyl sulfoxide, and aramid nanofibers Fiber diameter is 5-20nm, length is 5-20μm; Ti 3 C 2 T x The size of the MXene sheet is 100-300nm; the diameter of the silver nanowire is 20-50nm, and the aspect ratio is 500-1000; the hot-pressing pressure of the flexible high-strength MXene-based electromagnetic shielding composite film is 1MPa.

[0057] A method for preparing a flexible high-strength MXene-based ...

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Abstract

The invention discloses a flexible high-strength MXene-based electromagnetic shielding composite film, which comprises a conductive layer Ti3C2Tx MXene / silver nanowire and a polymer enhancement layeraramid nanofiber, and is characterized in that the mass fraction of the Ti3C2Tx MXene / silver nanowire conductive layer is 10-80%; the mass ratio of the Ti3C2Tx MXene to silver nanowire is (10: 0.5)-(10: 1.5). The invention further discloses a preparation method of the flexible high-strength MXene-based electromagnetic shielding composite film. The composite film prepared by the invention has excellent flexibility and mechanical properties, good conductivity and broadband high electromagnetic shielding effectiveness, and can meet the application in the fields of aerospace, military engineering,artificial intelligence and flexible wearable electronic equipment.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding composite materials, and relates to a flexible high-strength MXene-based electromagnetic shielding composite film, and also relates to a preparation method of the film. Background technique [0002] With the rapid development of high-power, high-density, and high-integration technologies for electronic and communication equipment, problems such as electromagnetic radiation, electromagnetic interference, and information leakage caused by electromagnetic waves are becoming more and more serious, limiting aerospace, military engineering, artificial intelligence, and The development of fields such as flexible and wearable electronic devices poses a threat to human health. In order to ensure the operational reliability and information security of precision electronic components and protect human health, it is necessary to use efficient electromagnetic shielding materials to attenuate ...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H13/48D21H13/46D21F13/00
CPCD21H13/26D21H13/48D21H13/46D21F13/00
Inventor 马忠雷康松磊马建中邵亮向小莲魏阿静景佳瑶张梦辉
Owner SHAANXI UNIV OF SCI & TECH
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