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MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and preparation method thereof

A polyvinyl alcohol, electromagnetic shielding technology, applied in the field of electromagnetic shielding materials, can solve the problem of shielding that has not been publicly reported, and achieve the effects of good electromagnetic shielding performance, excellent flexibility, and good flexibility

Active Publication Date: 2021-06-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The combination of magnetic material and conductive material is beneficial to optimize the impedance matching properties of the composite material, known as Fe of magnetic iron oxide 3 o 4 Particles meet the characteristics of magnetism; MXene and graphene are intercalated, and magnetic particles Fe are loaded 3 o 4 get Fe 3 o 4 @MXene / Graphene ternary composite material, and then compounded with polyvinyl alcohol to obtain a flexible and degradable composite film for electromagnetic shielding has not been reported publicly. Therefore, we proposed a MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and its preparation method

Method used

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  • MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and preparation method thereof
  • MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and preparation method thereof

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Embodiment 1

[0030] see figure 1 , a preparation method of MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film, comprising the following steps:

[0031] Step 1: Etching away the aluminum layer in the MAX phase with hydrofluoric acid, filtering, washing and drying to obtain layered MXene;

[0032] Step 2, the MXene obtained in the step 1 and Graphene are mixed at a high speed by a ball mill at a mass ratio of 5:1 to obtain the MXene / Graphene compound of MXene and Graphene intercalation;

[0033] Step 3, the MXene / Graphene compound of step 2 gained and nanoparticle Fe 3 o 4 Disperse in deionized water at a mass ratio of 2:1, ultrasonicate the mixed solution, filter, wash and dry to obtain Fe 3 o 4 @MXene / Graphene Ternary Composites;

[0034] Step 4, the Fe obtained in step 3 3 o 4 @MXene / Graphene ternary compound and polyvinyl alcohol are dispersed in deionized water, and the mixed solution is stirred until the filler is evenly dispersed in the aqueous poly...

Embodiment 2

[0045] The basis for combining Example 1 is different in that,

[0046] (1) Add 2g of Ti 3 AlC 2 Add to 20mL of 49% hydrofluoric acid solution and stir at room temperature for 24h to etch away Ti 3 AlC 2 The aluminum layer in, obtained layered MXene through filtering, washing and drying;

[0047] (2) Gained MXene is mixed with Graphene at a mass ratio of 5:1, and mixed for 2h at a speed of 300r / min in a ball mill to obtain an MXene / Graphene compound of MXene and Graphene intercalation;

[0048] (3) Combine MXene / Graphene composite with nanoparticle Fe 3 o 4 Disperse in deionized water at a mass ratio of 2:1, ultrasonicate at 80°C for 2 hours, filter, wash and dry to obtain Fe 3 o 4 @MXene / Graphene Ternary Composites;

[0049] (4) Add 2g of Fe 3 o 4 @MXene / Graphene ternary compound and 18g of polyvinyl alcohol are dispersed in 180g of deionized water, stirred at 100r / min at 75°C for 2 hours until the polyvinyl alcohol is completely dissolved and the filler is evenly d...

Embodiment 3

[0052] Based on the basis of embodiment 1-2 but different in that,

[0053] (1) Add 2g of Ti 3 AlC 2 Add to 20mL of 49% hydrofluoric acid solution and stir at room temperature for 24h to etch away Ti 3 AlC 2 The aluminum layer in, obtained layered MXene through filtering, washing and drying;

[0054] (2) Gained MXene is mixed with Graphene at a mass ratio of 5:1, and mixed for 2h at a speed of 300r / min in a ball mill to obtain an MXene / Graphene compound of MXene and Graphene intercalation;

[0055] (3) Combine MXene / Graphene composite with nanoparticle Fe 3 o 4 Disperse in deionized water at a mass ratio of 2:1, ultrasonicate at 80°C for 2 hours, filter, wash and dry to obtain Fe 3 o 4 @MXene / Graphene Ternary Composites;

[0056] (4) 4g of Fe 3 o 4 @MXene / Graphene ternary compound and 16g of polyvinyl alcohol are dispersed in 180g of deionized water, stirred at 100r / min at 75°C for 2 hours until the polyvinyl alcohol is completely dissolved and the filler is evenly d...

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Abstract

The invention discloses an MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and a preparation method thereof, and belongs to the technical field of electromagnetic shielding materials. The invention relates to an MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and a preparation method thereof. The preparation method comprises the following steps of: etching an MAX phase with hydrofluoric acid to obtain layered MXene, then intercalating the MXene and graphene to obtain an MXene / Graphene compound, loading magnetic nanoparticles Fe3O4 on the MXene / Graphene to obtain a Fe3O4@MXene / Graphene ternary composite material, and finally dissolving the Fe3O4@MXene / Graphene ternary composite material and polyvinyl alcohol in deionized water and drying to obtain the polyvinyl alcohol composite film. The obtained polyvinyl alcohol film has very good flexibility and has good compatibility with a composite filler, and the electromagnetic shielding effectiveness in the X wave band can reach 38-52 dB. Layered MXene and graphene with good conductivity are beneficial to multi-reflection attenuation of electromagnetic waves, the impedance matching characteristic is optimized through combination with the magnetic particles Fe3O4, and attenuation of the electromagnetic waves is facilitated.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding materials, in particular to an MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and a preparation method thereof. Background technique [0002] The rapid development of modern electronic technology has brought serious electromagnetic interference while greatly facilitating social life, and the development trend of light weight and high integration of modern electronic equipment has put forward higher and higher requirements for electromagnetic shielding materials. Although traditional metals and their alloys have very good shielding effectiveness as electromagnetic shielding materials, their defects such as large mass, poor flexibility, high cost, and poor corrosion resistance greatly limit their application in the field of electromagnetic shielding materials. Polymers have attracted more and more attention in the field of electromagnetic shielding ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L29/04C08K3/14C08K3/04C08K3/22
CPCC08J5/18C08J2300/16C08J2329/04C08K3/14C08K3/042C08K2003/2275C08K2201/011C08K2201/001
Inventor 束庆海姚嫒嫒吕席卷邹浩明杜君宜束红年
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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