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Polyimide/carbon nano-tube (PI/CNT) electromagnetic shielding composite material with isolation structure

An isolation structure and electromagnetic shielding technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of loss of PLA's effective coating of CNT, inability to fully exert electromagnetic shielding performance, poor mechanical and heat resistance, etc., to achieve Enhanced electromagnetic shielding performance, easy implementation, and low cost

Inactive Publication Date: 2020-02-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The simple mechanical blending in the above work cannot guarantee the effective coating of CNTs on PLA and the CNTs will be lost, and its electromagnetic shielding effectiveness cannot be fully exerted; compared with polyimide (PI), PLA has better performance in terms of mechanics and heat resistance. Poor, resulting in limited application of the final product

Method used

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  • Polyimide/carbon nano-tube (PI/CNT) electromagnetic shielding composite material with isolation structure
  • Polyimide/carbon nano-tube (PI/CNT) electromagnetic shielding composite material with isolation structure
  • Polyimide/carbon nano-tube (PI/CNT) electromagnetic shielding composite material with isolation structure

Examples

Experimental program
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Effect test

example 1～15

[0026] (1) Preparation of PI@CNT composite particles: At room temperature, PI particles (Ultem 1000, product of SABIC Innovative Plastics Co., Ltd.) with different particle sizes were used respectively, with the assistance of PI solution (DMAc solution of Ultem 1000), CNT (NC7000, product of Nanocyl Company in Belgium, taking CNT powder with an average size of 1.51 μm (length) and 9.5 nm (diameter) as an example) and PI matrix mass ratios are 0.5:99.5, 1:99, 3:97, respectively , 5:95, 7:93, corresponding to the added PI solution (taking the DMAc solution of PI with a solid content of 20wt% as an example) the mass parts are 4.0 parts, 9.9 parts, 15.4 parts, 19.7 parts, 25.5 parts respectively. First add PI solution to PI granules, then add CNT, add PI solution and CNT to PI granules in small amounts in small amounts, make sure to stir thoroughly after each addition, mix evenly, and cycle until CNT completely covers PI granules surface, and there is no obvious adhesion between p...

example 16～20

[0033](1) Preparation of PI@CNT composite particles: at room temperature, 93 parts of PI particles (Ultem 1000, product of SABIC Innovative Plastics Co., Ltd.) with an average particle size of 0.22 mm, CNT (NC7000, product of Nanocyl Company of Belgium, CNT powder with an average size of 1.51μm (length) and 9.5nm (diameter) as an example) 7 parts, respectively add PI solutions with different solid contents and different solvents (the DMAc solution of Ultem 1000 with a solid content of 15wt% and 25wt%, DMAc solution of Ultem 1000 with solid content of 15wt%, 20wt% and 25wt%) 34.0 parts, 20.4 parts, 34.0 parts, 25.5 parts, 20.4 parts. First add PI solution to the PI pellets, and then add CNT, add the PI solution and CNT to the PI pellets in small amounts in small amounts, make sure to stir thoroughly after each addition, mix evenly, and cycle until the CNTs completely cover the PI pellets surface, and there is no obvious adhesion between particles, and then use a blast oven to d...

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Abstract

The invention discloses a polyimide / carbon nano-tube (PI / CNT) electromagnetic shielding composite material with an isolation structure, wherein the material has a three-dimensional electric-conductingnetwork inside, and comprises, by mass, 93-99.5 parts of polyimide (PI), 0.5-7 parts of carbon nano-tubes (CNT) and 0.8-5.1 parts of a PI solution, the total parts of the PI, the CNT and the PI solution is 100, and the solid content of the PI solution is 15-25 wt%. The method comprises: uniformly and tightly coating the surfaces of PI particles with CNT under the assistance of a PI solution to prepare PI@CNT composite particles with a core-shell structure; and carrying out hot pressing molding at a proper temperature to partially plasticize the PI particles while not to flow, so that the uniform distribution of CNTs among the PI particles is ensured to form an isolation network structure, ie., a three-dimensional electric-conducting network, and finally the PI / CNT composite material obtains excellent electromagnetic shielding performance.

Description

technical field [0001] The invention relates to a method for preparing a polyimide / carbon nanotube (PI / CNT) composite material to obtain high electromagnetic shielding efficiency by constructing a three-dimensional isolated conductive network structure, belonging to the field of high-performance electromagnetic shielding composite material preparation. Background technique [0002] In recent years, with the widespread use of commercial, military, and scientific electronic instruments and communication equipment, the problem of electromagnetic interference (EMI) has become increasingly serious, which not only affects the normal work of other electronic equipment, but also endangers human health. Therefore, when using electronic equipment, electromagnetic shielding materials are required. Metal materials, as traditional electromagnetic shielding materials, have disadvantages such as high density, high price, easy corrosion, and difficult processing, which can no longer meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K3/04H05K9/00
CPCC08K2201/001C08K2201/011C08L2201/04C08K3/041H05K9/0081C08L79/08
Inventor 陈妍慧茹煊赫范泽文丁栋梁刘振国张秋禹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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