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Flexible electromagnetic shielding composite material, preparation method thereof and application

A technology of electromagnetic shielding and composite materials, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve problems such as poor flexibility, and achieve the effects of easy mastery of the process, low production cost, and easy implementation

Inactive Publication Date: 2017-09-15
四川省成都市树德中学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the current electromagnetic shielding composite materials with "isolation structure" are mostly based on rigid polymers. Although they have good shielding effect at low conductive filler content, they are not flexible enough to be foldable or bendable. Applications in the field of electronic devices

Method used

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  • Flexible electromagnetic shielding composite material, preparation method thereof and application
  • Flexible electromagnetic shielding composite material, preparation method thereof and application
  • Flexible electromagnetic shielding composite material, preparation method thereof and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The main raw materials are composed as follows in parts by weight: GTR 99.9%; CNT 0.1%.

[0034] The process steps adopt:

[0035] (1) Drying of raw materials: drying the CNTs in an oven at a constant temperature of 80°C until the water weight content is lower than 0.01%;

[0036] (2) Preparation of CNT / GTR composite particles: Mix the dried CNT and GTR in (1) by high-speed machinery to obtain CNT / GTR conductive composite particles. The mixing rate and time are 24,000rpm and 2min, respectively;

[0037] (3) Compression molding: Preheat the CNT / GTR composite particles prepared in step (2) at 170° C. for 5 minutes, then hot press at 50 MPa for 10 minutes, and finally cool to room temperature to obtain the target product in sheet form.

Embodiment 2

[0039] Others are the same as in Example 1, the ratio of raw materials is GTR 99.2%; CNT 0.2%;

Embodiment 3

[0041] Others are the same as in Example 1, the ratio of raw materials is GTR 99.7%; CNT 0.3%;

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Abstract

The invention provides a flexible electromagnetic shielding composite material and a preparation method thereof. The method includes the steps: (1) preparing materials in weight percentage: 95-99.9% of scrap rubber powder and 0.1-5% of carbon nano-tubes; (2) drying the carbon nano-tubes, and enabling the moisture of the carbon nano-tubes to be lower than 0.01%; (3) mechanically mixing the dried carbon nano-tubes acquired in the step (2) and the scrap rubber powder at the high temperature at the speed of 24000rpm to obtain composite particles; (4) performing preheating for 5 minutes on the composite particles acquired in the step (3) at the temperature ranging from 150 DEG C to 180 DEG C, performing hot pressing for 10 minutes under the pressure ranging from 10MPa to 50MPa, performing cold pressing to the room temperature under the pressure of 10MPa to obtain flake-like target products. The average diameter of the carbon nano-tubes is 9.5 nanometers, and the average length of the carbon nano-tubes is 1.5 micrometers. The invention further provides an application of the flexible electromagnetic shielding composite material to the field of flexible electron devices. The preparation method is easy to implement, the obtained material has excellent EMI SE (electromagnetic interference shielding effect) and good market application prospect, and scrap rubber can be effectively utilized.

Description

technical field [0001] The invention belongs to the field of flexible conductive polymer composite materials, in particular to a flexible electromagnetic shielding composite material and its preparation method and application. Background technique [0002] With the rapid development of the global automobile industry, 17 million tons of waste tire rubber is produced every year in the world, and it is increasing year by year, which brings black pollution that is more serious than white pollution to the ecological environment. Tire rubber has a three-dimensional cross-linked structure, which prevents it from degrading naturally for a long time after it is discarded, and is difficult to directly recycle. Therefore, how to effectively recycle waste tire rubber has become a common concern in academia and industry (Zhou Xingping, et al. .Chinese invention patent, CN201310680159.8). Waste tire rubber can be desulfurized to obtain reclaimed rubber for repeated recycling, but the des...

Claims

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Application Information

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IPC IPC(8): C08L19/00C08K7/24H05K9/00
CPCC08K7/24C08K2201/003C08K2201/004C08K2201/011C08L2203/20H05K9/0081C08L19/003
Inventor 李怡珂贾利川鄢定祥
Owner 四川省成都市树德中学
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