A kind of composite wave absorbing film material and preparation method thereof

A film material and film technology are applied in the field of composite wave absorbing film materials and their preparation, which can solve the problems of unfavorable large-area promotion and high safety cost, and achieve the effects of good comprehensive wave absorption performance, energy saving and process time shortening.

Active Publication Date: 2022-07-15
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent CN 111137874A discloses a method for preparing composite wave-absorbing materials using HKUST-1 as a template. High, not conducive to large-scale promotion

Method used

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  • A kind of composite wave absorbing film material and preparation method thereof
  • A kind of composite wave absorbing film material and preparation method thereof
  • A kind of composite wave absorbing film material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of a composite wave absorbing film material, comprising the following steps:

[0034] In step 1, 1.9 g of copper nitrate trihydrate and 1.7 g of trimesic acid were added to 100 mL of deionized water and 100 mL of ethanol respectively, stirred for 15 min until dissolved, and mixed to obtain solution A;

[0035] Step 2, adding 10 mL of graphite oxide hydrosol with a concentration of 10 mg / mL into 200 mL of ethanol, and ultrasonically dispersing for 30 min to obtain a uniformly dispersed graphene oxide solution;

[0036] Step 3, adding the graphene oxide solution of step 2 to solution A in step 1 and stirring for 18 h to obtain solution B;

[0037] Step 4, place the PTFE suction filtration membrane with a pore size of 450 nm on the sand core of the suction filtration bottle, set up the suction filtration device, pour 20 mL of B liquid into the suction filtration device, and perform suction filtration for about 10 min. Remove the suction filtration mem...

Embodiment 2

[0043] The preparation method of the composite wave absorbing film material in this example is as follows: the HKUST-1 / graphene oxide composite film after drying in step 5 in Example 1 is heat-treated at 500° C. for 3 h in a nitrogen atmosphere. The reflection loss of the obtained absorbing film in the range of 2-18 GHz is as follows: Figure 5 shown.

Embodiment 3

[0045] The preparation method of the composite wave absorbing film material in this embodiment is as follows: the HKUST-1 / graphene oxide composite film after drying in step 5 in Example 1 is heat-treated at 600° C. for 3 h in a nitrogen atmosphere. The reflection loss of the obtained absorbing film in the range of 2-18 GHz is as follows: Image 6 shown.

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Abstract

The invention discloses a composite wave absorbing film material and a preparation method thereof. The method comprises the following steps: adding copper nitrate trihydrate and trimesic acid into equal volumes of deionized water and ethanol, respectively, stirring and dissolving, and then mixing to obtain liquid A. Graphite oxide hydrosol is added in ethanol and ultrasonically dispersed to obtain graphene oxide solution; Add in liquid A and stir to obtain liquid B; Liquid B is dried after suction filtration, and the attachments on the filter membrane naturally fall off to obtain HKUST-1 / The graphene oxide composite film was finally treated at a high temperature of 300-900 °C for 2-4 h in a nitrogen atmosphere. The invention can simply prepare the light-weight flexible HKUST-1 / graphene oxide composite film in the air without heating and an external electric field, which is more energy-saving and efficient, and is favorable for industrialized mass production. The composite absorbing film derived from the composite film after high temperature treatment has good comprehensive absorbing performance, and the maximum electromagnetic wave absorption rate can reach 94.4%.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to a composite wave absorbing film material and a preparation method thereof. Background technique [0002] In recent years, metal-organic frameworks have important applications in many fields such as gas adsorption, storage and separation, catalysis, and sensing, and have become a hot topic in the current research field. As a member of metal-organic framework composites, HKUST- 1 The application prospects of materials are becoming more and more extensive, and a lot of research has been done. [0003] Chinese invention patent CN 113680320 A discloses a carbonization method for HKUST-1 derived carbon material, which can be used to adsorb organic dyes, but the material is powder material, which limits its application. Chinese invention patent CN 108479434 B discloses a preparation method and application of a Li-doped HKUST-1 membrane materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00H01Q17/00C01B32/184C01B32/05
CPCH05K9/0081H01Q17/00C01B32/184C01B32/05Y02E60/13
Inventor 张步升权斌王宇陈雨
Owner NANJING UNIV OF INFORMATION SCI & TECH
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