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Composite electromagnetic shielding film and preparation method thereof

A composite electromagnetic and film technology, applied in the field of materials, can solve the problems of high density of metal materials, electromagnetic shielding performance to be improved, incompetence of corrosion resistance and flexibility, etc.

Inactive Publication Date: 2021-05-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, some metal materials with high conductivity have good electromagnetic shielding ability, such as copper, aluminum, etc., but the disadvantages of high density, corrosion resistance and poor flexibility of metal materials limit their application.
In recent years, some carbon-based electromagnetic shielding materials have been extensively studied, such as carbon nanotubes and graphene. Carbon-based electromagnetic shielding materials have the advantages of light weight, flexibility, and corrosion resistance, and have excellent application prospects. However, carbon-based The electromagnetic shielding performance of electromagnetic shielding materials in the form of flexible films needs to be improved

Method used

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  • Composite electromagnetic shielding film and preparation method thereof
  • Composite electromagnetic shielding film and preparation method thereof
  • Composite electromagnetic shielding film and preparation method thereof

Examples

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preparation example Construction

[0045] The invention provides an MXene / bacterial cellulose composite electromagnetic shielding film and a preparation method thereof. It is characterized in that the method comprises the following steps: 1) preparation of bacterial cellulose fiber homogenate; 2) preparation of MXene dispersion liquid; 3) bacterial cellulose fiber homogenate and MXene dispersion liquid alternate suction filtration to form a film.

[0046] In step 1, the impurities in the bacterial cellulose raw material are removed by pretreatment of the bacterial cellulose wet gel. There are impurities such as protein, carbonate and other organic matter of some bacterial remains in the raw material (bacterial cellulose wet gel) used in the present invention, therefore need pretreatment to remove these impurities, improve the purity of bacterial cellulose, be beneficial to bacterial fiber The mechanical properties of the thin film are improved. Among them, alkali solution treatment is to remove impurities such...

Embodiment 1

[0052] (1) Preparation of bacterial cellulose homogenate:

[0053] First carry out the pretreatment of raw material bacterial cellulose wet gel:

[0054] 1.1 Cut the raw material bacterial cellulose wet gel block into small pieces of 5cm*3cm;

[0055] 1.2 Prepare 1.94wt.% NaOH solution, immerse the bacterial cellulose wet gel in the above NaOH solution, stir at 100°C for 2 hours, then sonicate for 1 hour, and then rinse;

[0056] 1.3 Prepare a 1.045wt.% NaOH solution, immerse the bacterial cellulose wet gel treated in step 1.2 in the NaOH solution of this concentration, stir at 100°C for 2 hours, then sonicate for 1 hour, and then rinse;

[0057] 1.4 Submerge the bacterial cellulose wet gel treated in step 1.3 in a 1.045wt.% NaOH solution, stir at 100°C for 24 hours, then ultrasonicate for 1 hour, and rinse until the bacterial cellulose wet gel leachate is neutral;

[0058] 1.5 Prepare 1.5wt.% acetic acid solution, immerse the bacterial cellulose wet gel treated in step 1.4 ...

Embodiment 2

[0070] A method similar to that of Example 1 was used to prepare a composite electromagnetic shielding film, wherein, in step (3) of this example, the solutions added during suction filtration were: 3.33 g of bacterial cellulose homogenate, 5.56 mL of MXene dispersion, and 5.56 mL of bacterial cellulose Vegetable homogenate 3.33g, MXene dispersion 5.56mL, bacterial cellulose homogenate 3.33g. The MXene / bacterial cellulose composite film was prepared, which was designated as sample number B3M2. The total thickness of the composite film is 129.8 μm, in which the average thickness of the MXene film layer is 32.8 μm per layer, and the average thickness of the bacterial cellulose film layer is 21.4 μm per layer.

[0071] Such as figure 1 As shown, the structure of the MXene / bacterial cellulose composite electromagnetic shielding film 3 prepared according to Example 2 is a sandwich structure of bacterial cellulose and MXene, wherein the bacterial cellulose film layer is marked as 1...

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Abstract

The invention discloses a composite electromagnetic shielding film and a preparation method thereof. The composite electromagnetic shielding thin film comprises bacterial cellulose film layers and MXene film layers, wherein the bacterial cellulose film layers and the MXene film layers are alternately arranged, and the bacterial cellulose film layers are arranged on the two outer surfaces of the composite electromagnetic shielding film. In the composite electromagnetic shielding film provided by the invention, intermolecular acting force mainly involving hydrogen bonds exists between the bacterial cellulose film layers and the MXene film layers, so the tensile stress of the MXene film layers can be transmitted to the bacterial cellulose film layers when the composite film bears the tensile stress due to the interaction force, and thus, the mechanical enhancement effect of bacterial cellulose is exerted; and in the structure that the bacterial cellulose film layers and the MXene film layers are alternately arranged, electromagnetic waves can generate an internal multiple reflection effect among the multiple MXene film layers, so the stroke of the electromagnetic waves in the composite film is increased, more electromagnetic wave radiation energy is absorbed by MXene, and therefore, the overall electromagnetic shielding performance of the composite film is improved.

Description

technical field [0001] The invention belongs to the field of materials, in particular, relates to a MXene / bacterial cellulose composite electromagnetic shielding film and a preparation method thereof Background technique [0002] With the increasing popularity of handheld electronic devices and wearable electronic devices, electromagnetic wave radiation pollution has become ubiquitous. Electromagnetic wave radiation will cause mutual interference between electronic equipment and internal components of the equipment, affect the normal operation of the equipment, and have potential harm to the human body. Therefore, how to better protect against electromagnetic interference is a problem of great research value. [0003] Electromagnetic shielding materials are materials that reflect or absorb electromagnetic waves so that as little electromagnetic radiation as possible is transmitted to the other side, and are widely used in the protection of electromagnetic interference. Gen...

Claims

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Application Information

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IPC IPC(8): C08J5/18H05K9/00C08L1/02C08K3/14
CPCC08J5/18C08J2301/02C08K3/14H05K9/0081
Inventor 刘庆雷陈宇湛
Owner SHANGHAI JIAO TONG UNIV
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